![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
3037 lines
78 KiB
C
3037 lines
78 KiB
C
/*
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* macserial.c: Serial port driver for Power Macintoshes.
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*
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* Derived from drivers/sbus/char/sunserial.c by Paul Mackerras.
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*
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* Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au)
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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*
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* Receive DMA code by Takashi Oe <toe@unlserve.unl.edu>.
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*
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* $Id: macserial.c,v 1.24.2.4 1999/10/19 04:36:42 paulus Exp $
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*/
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#include <linux/config.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/interrupt.h>
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#include <linux/workqueue.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/major.h>
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#include <linux/string.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#ifdef CONFIG_SERIAL_CONSOLE
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#include <linux/console.h>
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#endif
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#include <linux/slab.h>
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#include <linux/bitops.h>
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#include <asm/sections.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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#include <asm/irq.h>
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#include <asm/prom.h>
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#include <asm/system.h>
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#include <asm/segment.h>
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#include <asm/machdep.h>
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#include <asm/pmac_feature.h>
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#include <linux/adb.h>
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#include <linux/pmu.h>
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#ifdef CONFIG_KGDB
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#include <asm/kgdb.h>
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#endif
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#include <asm/dbdma.h>
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#include "macserial.h"
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#ifdef CONFIG_PMAC_PBOOK
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static int serial_notify_sleep(struct pmu_sleep_notifier *self, int when);
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static struct pmu_sleep_notifier serial_sleep_notifier = {
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serial_notify_sleep,
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SLEEP_LEVEL_MISC,
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};
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#endif
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#define SUPPORT_SERIAL_DMA
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#define MACSERIAL_VERSION "2.0"
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/*
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* It would be nice to dynamically allocate everything that
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* depends on NUM_SERIAL, so we could support any number of
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* Z8530s, but for now...
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*/
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#define NUM_SERIAL 2 /* Max number of ZS chips supported */
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#define NUM_CHANNELS (NUM_SERIAL * 2) /* 2 channels per chip */
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/* On PowerMacs, the hardware takes care of the SCC recovery time,
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but we need the eieio to make sure that the accesses occur
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in the order we want. */
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#define RECOVERY_DELAY eieio()
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static struct tty_driver *serial_driver;
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struct mac_zschannel zs_channels[NUM_CHANNELS];
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struct mac_serial zs_soft[NUM_CHANNELS];
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int zs_channels_found;
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struct mac_serial *zs_chain; /* list of all channels */
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struct tty_struct zs_ttys[NUM_CHANNELS];
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static int is_powerbook;
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#ifdef CONFIG_SERIAL_CONSOLE
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static struct console sercons;
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#endif
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#ifdef CONFIG_KGDB
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struct mac_zschannel *zs_kgdbchan;
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static unsigned char scc_inittab[] = {
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9, 0x80, /* reset A side (CHRA) */
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13, 0, /* set baud rate divisor */
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12, 1,
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14, 1, /* baud rate gen enable, src=rtxc (BRENABL) */
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11, 0x50, /* clocks = br gen (RCBR | TCBR) */
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5, 0x6a, /* tx 8 bits, assert RTS (Tx8 | TxENAB | RTS) */
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4, 0x44, /* x16 clock, 1 stop (SB1 | X16CLK)*/
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3, 0xc1, /* rx enable, 8 bits (RxENABLE | Rx8)*/
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};
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#endif
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#define ZS_CLOCK 3686400 /* Z8530 RTxC input clock rate */
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/* serial subtype definitions */
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#define SERIAL_TYPE_NORMAL 1
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/* number of characters left in xmit buffer before we ask for more */
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#define WAKEUP_CHARS 256
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/*
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* Debugging.
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*/
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#undef SERIAL_DEBUG_INTR
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#undef SERIAL_DEBUG_OPEN
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#undef SERIAL_DEBUG_FLOW
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#undef SERIAL_DEBUG_POWER
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#undef SERIAL_DEBUG_THROTTLE
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#undef SERIAL_DEBUG_STOP
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#undef SERIAL_DEBUG_BAUDS
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#define RS_STROBE_TIME 10
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#define RS_ISR_PASS_LIMIT 256
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#define _INLINE_ inline
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#ifdef SERIAL_DEBUG_OPEN
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#define OPNDBG(fmt, arg...) printk(KERN_DEBUG fmt , ## arg)
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#else
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#define OPNDBG(fmt, arg...) do { } while (0)
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#endif
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#ifdef SERIAL_DEBUG_POWER
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#define PWRDBG(fmt, arg...) printk(KERN_DEBUG fmt , ## arg)
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#else
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#define PWRDBG(fmt, arg...) do { } while (0)
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#endif
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#ifdef SERIAL_DEBUG_BAUDS
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#define BAUDBG(fmt, arg...) printk(fmt , ## arg)
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#else
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#define BAUDBG(fmt, arg...) do { } while (0)
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#endif
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static void probe_sccs(void);
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static void change_speed(struct mac_serial *info, struct termios *old);
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static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
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static int set_scc_power(struct mac_serial * info, int state);
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static int setup_scc(struct mac_serial * info);
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static void dbdma_reset(volatile struct dbdma_regs *dma);
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static void dbdma_flush(volatile struct dbdma_regs *dma);
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static irqreturn_t rs_txdma_irq(int irq, void *dev_id, struct pt_regs *regs);
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static irqreturn_t rs_rxdma_irq(int irq, void *dev_id, struct pt_regs *regs);
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static void dma_init(struct mac_serial * info);
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static void rxdma_start(struct mac_serial * info, int curr);
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static void rxdma_to_tty(struct mac_serial * info);
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/*
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* tmp_buf is used as a temporary buffer by serial_write. We need to
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* lock it in case the copy_from_user blocks while swapping in a page,
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* and some other program tries to do a serial write at the same time.
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* Since the lock will only come under contention when the system is
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* swapping and available memory is low, it makes sense to share one
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* buffer across all the serial ports, since it significantly saves
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* memory if large numbers of serial ports are open.
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*/
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static unsigned char *tmp_buf;
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static DECLARE_MUTEX(tmp_buf_sem);
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static inline int __pmac
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serial_paranoia_check(struct mac_serial *info,
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char *name, const char *routine)
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{
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#ifdef SERIAL_PARANOIA_CHECK
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static const char badmagic[] = KERN_WARNING
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"Warning: bad magic number for serial struct %s in %s\n";
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static const char badinfo[] = KERN_WARNING
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"Warning: null mac_serial for %s in %s\n";
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if (!info) {
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printk(badinfo, name, routine);
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return 1;
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}
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if (info->magic != SERIAL_MAGIC) {
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printk(badmagic, name, routine);
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return 1;
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}
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#endif
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return 0;
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}
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/*
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* Reading and writing Z8530 registers.
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*/
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static inline unsigned char __pmac read_zsreg(struct mac_zschannel *channel,
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unsigned char reg)
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{
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unsigned char retval;
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unsigned long flags;
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/*
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* We have to make this atomic.
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*/
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spin_lock_irqsave(&channel->lock, flags);
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if (reg != 0) {
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*channel->control = reg;
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RECOVERY_DELAY;
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}
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retval = *channel->control;
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RECOVERY_DELAY;
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spin_unlock_irqrestore(&channel->lock, flags);
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return retval;
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}
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static inline void __pmac write_zsreg(struct mac_zschannel *channel,
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unsigned char reg, unsigned char value)
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{
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unsigned long flags;
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spin_lock_irqsave(&channel->lock, flags);
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if (reg != 0) {
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*channel->control = reg;
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RECOVERY_DELAY;
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}
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*channel->control = value;
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RECOVERY_DELAY;
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spin_unlock_irqrestore(&channel->lock, flags);
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return;
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}
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static inline unsigned char __pmac read_zsdata(struct mac_zschannel *channel)
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{
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unsigned char retval;
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retval = *channel->data;
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RECOVERY_DELAY;
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return retval;
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}
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static inline void write_zsdata(struct mac_zschannel *channel,
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unsigned char value)
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{
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*channel->data = value;
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RECOVERY_DELAY;
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return;
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}
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static inline void load_zsregs(struct mac_zschannel *channel,
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unsigned char *regs)
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{
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ZS_CLEARERR(channel);
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ZS_CLEARFIFO(channel);
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/* Load 'em up */
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write_zsreg(channel, R4, regs[R4]);
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write_zsreg(channel, R10, regs[R10]);
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write_zsreg(channel, R3, regs[R3] & ~RxENABLE);
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write_zsreg(channel, R5, regs[R5] & ~TxENAB);
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write_zsreg(channel, R1, regs[R1]);
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write_zsreg(channel, R9, regs[R9]);
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write_zsreg(channel, R11, regs[R11]);
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write_zsreg(channel, R12, regs[R12]);
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write_zsreg(channel, R13, regs[R13]);
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write_zsreg(channel, R14, regs[R14]);
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write_zsreg(channel, R15, regs[R15]);
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write_zsreg(channel, R3, regs[R3]);
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write_zsreg(channel, R5, regs[R5]);
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return;
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}
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/* Sets or clears DTR/RTS on the requested line */
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static inline void zs_rtsdtr(struct mac_serial *ss, int set)
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{
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if (set)
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ss->curregs[5] |= (RTS | DTR);
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else
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ss->curregs[5] &= ~(RTS | DTR);
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write_zsreg(ss->zs_channel, 5, ss->curregs[5]);
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return;
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}
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/* Utility routines for the Zilog */
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static inline int get_zsbaud(struct mac_serial *ss)
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{
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struct mac_zschannel *channel = ss->zs_channel;
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int brg;
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if ((ss->curregs[R11] & TCBR) == 0) {
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/* higher rates don't use the baud rate generator */
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return (ss->curregs[R4] & X32CLK)? ZS_CLOCK/32: ZS_CLOCK/16;
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}
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/* The baud rate is split up between two 8-bit registers in
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* what is termed 'BRG time constant' format in my docs for
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* the chip, it is a function of the clk rate the chip is
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* receiving which happens to be constant.
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*/
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brg = (read_zsreg(channel, 13) << 8);
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brg |= read_zsreg(channel, 12);
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return BRG_TO_BPS(brg, (ZS_CLOCK/(ss->clk_divisor)));
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}
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/* On receive, this clears errors and the receiver interrupts */
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static inline void rs_recv_clear(struct mac_zschannel *zsc)
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{
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write_zsreg(zsc, 0, ERR_RES);
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write_zsreg(zsc, 0, RES_H_IUS); /* XXX this is unnecessary */
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}
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/*
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* Reset a Descriptor-Based DMA channel.
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*/
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static void dbdma_reset(volatile struct dbdma_regs *dma)
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{
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int i;
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out_le32(&dma->control, (WAKE|FLUSH|PAUSE|RUN) << 16);
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/*
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* Yes this looks peculiar, but apparently it needs to be this
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* way on some machines. (We need to make sure the DBDMA
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* engine has actually got the write above and responded
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* to it. - paulus)
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*/
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for (i = 200; i > 0; --i)
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if (ld_le32(&dma->status) & RUN)
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udelay(1);
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}
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/*
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* Tells a DBDMA channel to stop and write any buffered data
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* it might have to memory.
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*/
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static _INLINE_ void dbdma_flush(volatile struct dbdma_regs *dma)
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{
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int i = 0;
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out_le32(&dma->control, (FLUSH << 16) | FLUSH);
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while (((in_le32(&dma->status) & FLUSH) != 0) && (i++ < 100))
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udelay(1);
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}
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/*
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* ----------------------------------------------------------------------
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*
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* Here starts the interrupt handling routines. All of the following
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* subroutines are declared as inline and are folded into
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* rs_interrupt(). They were separated out for readability's sake.
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*
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* - Ted Ts'o (tytso@mit.edu), 7-Mar-93
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* -----------------------------------------------------------------------
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*/
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/*
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* This routine is used by the interrupt handler to schedule
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* processing in the software interrupt portion of the driver.
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*/
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static _INLINE_ void rs_sched_event(struct mac_serial *info,
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int event)
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{
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info->event |= 1 << event;
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schedule_work(&info->tqueue);
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}
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/* Work out the flag value for a z8530 status value. */
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static _INLINE_ int stat_to_flag(int stat)
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{
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int flag;
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if (stat & Rx_OVR) {
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flag = TTY_OVERRUN;
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} else if (stat & FRM_ERR) {
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flag = TTY_FRAME;
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} else if (stat & PAR_ERR) {
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flag = TTY_PARITY;
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} else
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flag = 0;
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return flag;
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}
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static _INLINE_ void receive_chars(struct mac_serial *info,
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struct pt_regs *regs)
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{
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struct tty_struct *tty = info->tty;
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unsigned char ch, stat, flag;
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while ((read_zsreg(info->zs_channel, 0) & Rx_CH_AV) != 0) {
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stat = read_zsreg(info->zs_channel, R1);
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ch = read_zsdata(info->zs_channel);
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#ifdef CONFIG_KGDB
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if (info->kgdb_channel) {
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if (ch == 0x03 || ch == '$')
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breakpoint();
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if (stat & (Rx_OVR|FRM_ERR|PAR_ERR))
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write_zsreg(info->zs_channel, 0, ERR_RES);
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return;
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}
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#endif
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if (!tty)
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continue;
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if (tty->flip.count >= TTY_FLIPBUF_SIZE)
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tty_flip_buffer_push(tty);
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if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
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static int flip_buf_ovf;
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if (++flip_buf_ovf <= 1)
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printk(KERN_WARNING "FB. overflow: %d\n",
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flip_buf_ovf);
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break;
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}
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tty->flip.count++;
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{
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static int flip_max_cnt;
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if (flip_max_cnt < tty->flip.count)
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flip_max_cnt = tty->flip.count;
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}
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flag = stat_to_flag(stat);
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if (flag)
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/* reset the error indication */
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write_zsreg(info->zs_channel, 0, ERR_RES);
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*tty->flip.flag_buf_ptr++ = flag;
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*tty->flip.char_buf_ptr++ = ch;
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}
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if (tty)
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tty_flip_buffer_push(tty);
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}
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static void transmit_chars(struct mac_serial *info)
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{
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if ((read_zsreg(info->zs_channel, 0) & Tx_BUF_EMP) == 0)
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return;
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info->tx_active = 0;
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if (info->x_char && !info->power_wait) {
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/* Send next char */
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write_zsdata(info->zs_channel, info->x_char);
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info->x_char = 0;
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info->tx_active = 1;
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return;
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}
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if ((info->xmit_cnt <= 0) || info->tty->stopped || info->tx_stopped
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|| info->power_wait) {
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write_zsreg(info->zs_channel, 0, RES_Tx_P);
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return;
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}
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/* Send char */
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write_zsdata(info->zs_channel, info->xmit_buf[info->xmit_tail++]);
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info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
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info->xmit_cnt--;
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info->tx_active = 1;
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if (info->xmit_cnt < WAKEUP_CHARS)
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rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
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}
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static void powerup_done(unsigned long data)
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{
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struct mac_serial *info = (struct mac_serial *) data;
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unsigned long flags;
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spin_lock_irqsave(&info->lock, flags);
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info->power_wait = 0;
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transmit_chars(info);
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spin_unlock_irqrestore(&info->lock, flags);
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}
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|
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static _INLINE_ void status_handle(struct mac_serial *info)
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{
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unsigned char status;
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|
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/* Get status from Read Register 0 */
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status = read_zsreg(info->zs_channel, 0);
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|
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/* Check for DCD transitions */
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if (((status ^ info->read_reg_zero) & DCD) != 0
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&& info->tty && !C_CLOCAL(info->tty)) {
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if (status & DCD) {
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wake_up_interruptible(&info->open_wait);
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} else {
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if (info->tty)
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tty_hangup(info->tty);
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}
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}
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|
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/* Check for CTS transitions */
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if (info->tty && C_CRTSCTS(info->tty)) {
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/*
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* For some reason, on the Power Macintosh,
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* it seems that the CTS bit is 1 when CTS is
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* *negated* and 0 when it is asserted.
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* The DCD bit doesn't seem to be inverted
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|
* like this.
|
|
*/
|
|
if ((status & CTS) == 0) {
|
|
if (info->tx_stopped) {
|
|
#ifdef SERIAL_DEBUG_FLOW
|
|
printk(KERN_DEBUG "CTS up\n");
|
|
#endif
|
|
info->tx_stopped = 0;
|
|
if (!info->tx_active)
|
|
transmit_chars(info);
|
|
}
|
|
} else {
|
|
#ifdef SERIAL_DEBUG_FLOW
|
|
printk(KERN_DEBUG "CTS down\n");
|
|
#endif
|
|
info->tx_stopped = 1;
|
|
}
|
|
}
|
|
|
|
/* Clear status condition... */
|
|
write_zsreg(info->zs_channel, 0, RES_EXT_INT);
|
|
info->read_reg_zero = status;
|
|
}
|
|
|
|
static _INLINE_ void receive_special_dma(struct mac_serial *info)
|
|
{
|
|
unsigned char stat, flag;
|
|
volatile struct dbdma_regs *rd = &info->rx->dma;
|
|
int where = RX_BUF_SIZE;
|
|
|
|
spin_lock(&info->rx_dma_lock);
|
|
if ((ld_le32(&rd->status) & ACTIVE) != 0)
|
|
dbdma_flush(rd);
|
|
if (in_le32(&rd->cmdptr)
|
|
== virt_to_bus(info->rx_cmds[info->rx_cbuf] + 1))
|
|
where -= in_le16(&info->rx->res_count);
|
|
where--;
|
|
|
|
stat = read_zsreg(info->zs_channel, R1);
|
|
|
|
flag = stat_to_flag(stat);
|
|
if (flag) {
|
|
info->rx_flag_buf[info->rx_cbuf][where] = flag;
|
|
/* reset the error indication */
|
|
write_zsreg(info->zs_channel, 0, ERR_RES);
|
|
}
|
|
|
|
spin_unlock(&info->rx_dma_lock);
|
|
}
|
|
|
|
/*
|
|
* This is the serial driver's generic interrupt routine
|
|
*/
|
|
static irqreturn_t rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
|
|
{
|
|
struct mac_serial *info = (struct mac_serial *) dev_id;
|
|
unsigned char zs_intreg;
|
|
int shift;
|
|
unsigned long flags;
|
|
int handled = 0;
|
|
|
|
if (!(info->flags & ZILOG_INITIALIZED)) {
|
|
printk(KERN_WARNING "rs_interrupt: irq %d, port not "
|
|
"initialized\n", irq);
|
|
disable_irq(irq);
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
/* NOTE: The read register 3, which holds the irq status,
|
|
* does so for both channels on each chip. Although
|
|
* the status value itself must be read from the A
|
|
* channel and is only valid when read from channel A.
|
|
* Yes... broken hardware...
|
|
*/
|
|
#define CHAN_IRQMASK (CHBRxIP | CHBTxIP | CHBEXT)
|
|
|
|
if (info->zs_chan_a == info->zs_channel)
|
|
shift = 3; /* Channel A */
|
|
else
|
|
shift = 0; /* Channel B */
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
for (;;) {
|
|
zs_intreg = read_zsreg(info->zs_chan_a, 3) >> shift;
|
|
#ifdef SERIAL_DEBUG_INTR
|
|
printk(KERN_DEBUG "rs_interrupt: irq %d, zs_intreg 0x%x\n",
|
|
irq, (int)zs_intreg);
|
|
#endif
|
|
|
|
if ((zs_intreg & CHAN_IRQMASK) == 0)
|
|
break;
|
|
handled = 1;
|
|
|
|
if (zs_intreg & CHBRxIP) {
|
|
/* If we are doing DMA, we only ask for interrupts
|
|
on characters with errors or special conditions. */
|
|
if (info->dma_initted)
|
|
receive_special_dma(info);
|
|
else
|
|
receive_chars(info, regs);
|
|
}
|
|
if (zs_intreg & CHBTxIP)
|
|
transmit_chars(info);
|
|
if (zs_intreg & CHBEXT)
|
|
status_handle(info);
|
|
}
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
return IRQ_RETVAL(handled);
|
|
}
|
|
|
|
/* Transmit DMA interrupt - not used at present */
|
|
static irqreturn_t rs_txdma_irq(int irq, void *dev_id, struct pt_regs *regs)
|
|
{
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* Receive DMA interrupt.
|
|
*/
|
|
static irqreturn_t rs_rxdma_irq(int irq, void *dev_id, struct pt_regs *regs)
|
|
{
|
|
struct mac_serial *info = (struct mac_serial *) dev_id;
|
|
volatile struct dbdma_cmd *cd;
|
|
|
|
if (!info->dma_initted)
|
|
return IRQ_NONE;
|
|
spin_lock(&info->rx_dma_lock);
|
|
/* First, confirm that this interrupt is, indeed, coming */
|
|
/* from Rx DMA */
|
|
cd = info->rx_cmds[info->rx_cbuf] + 2;
|
|
if ((in_le16(&cd->xfer_status) & (RUN | ACTIVE)) != (RUN | ACTIVE)) {
|
|
spin_unlock(&info->rx_dma_lock);
|
|
return IRQ_NONE;
|
|
}
|
|
if (info->rx_fbuf != RX_NO_FBUF) {
|
|
info->rx_cbuf = info->rx_fbuf;
|
|
if (++info->rx_fbuf == info->rx_nbuf)
|
|
info->rx_fbuf = 0;
|
|
if (info->rx_fbuf == info->rx_ubuf)
|
|
info->rx_fbuf = RX_NO_FBUF;
|
|
}
|
|
spin_unlock(&info->rx_dma_lock);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* -------------------------------------------------------------------
|
|
* Here ends the serial interrupt routines.
|
|
* -------------------------------------------------------------------
|
|
*/
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* rs_stop() and rs_start()
|
|
*
|
|
* This routines are called before setting or resetting tty->stopped.
|
|
* ------------------------------------------------------------
|
|
*/
|
|
static void rs_stop(struct tty_struct *tty)
|
|
{
|
|
struct mac_serial *info = (struct mac_serial *)tty->driver_data;
|
|
|
|
#ifdef SERIAL_DEBUG_STOP
|
|
printk(KERN_DEBUG "rs_stop %ld....\n",
|
|
tty->ldisc.chars_in_buffer(tty));
|
|
#endif
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_stop"))
|
|
return;
|
|
|
|
#if 0
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
if (info->curregs[5] & TxENAB) {
|
|
info->curregs[5] &= ~TxENAB;
|
|
info->pendregs[5] &= ~TxENAB;
|
|
write_zsreg(info->zs_channel, 5, info->curregs[5]);
|
|
}
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
#endif
|
|
}
|
|
|
|
static void rs_start(struct tty_struct *tty)
|
|
{
|
|
struct mac_serial *info = (struct mac_serial *)tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
#ifdef SERIAL_DEBUG_STOP
|
|
printk(KERN_DEBUG "rs_start %ld....\n",
|
|
tty->ldisc.chars_in_buffer(tty));
|
|
#endif
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_start"))
|
|
return;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
#if 0
|
|
if (info->xmit_cnt && info->xmit_buf && !(info->curregs[5] & TxENAB)) {
|
|
info->curregs[5] |= TxENAB;
|
|
info->pendregs[5] = info->curregs[5];
|
|
write_zsreg(info->zs_channel, 5, info->curregs[5]);
|
|
}
|
|
#else
|
|
if (info->xmit_cnt && info->xmit_buf && !info->tx_active) {
|
|
transmit_chars(info);
|
|
}
|
|
#endif
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
static void do_softint(void *private_)
|
|
{
|
|
struct mac_serial *info = (struct mac_serial *) private_;
|
|
struct tty_struct *tty;
|
|
|
|
tty = info->tty;
|
|
if (!tty)
|
|
return;
|
|
|
|
if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
|
|
tty_wakeup(tty);
|
|
}
|
|
|
|
static int startup(struct mac_serial * info)
|
|
{
|
|
int delay;
|
|
|
|
OPNDBG("startup() (ttyS%d, irq %d)\n", info->line, info->irq);
|
|
|
|
if (info->flags & ZILOG_INITIALIZED) {
|
|
OPNDBG(" -> already inited\n");
|
|
return 0;
|
|
}
|
|
|
|
if (!info->xmit_buf) {
|
|
info->xmit_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL);
|
|
if (!info->xmit_buf)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
OPNDBG("starting up ttyS%d (irq %d)...\n", info->line, info->irq);
|
|
|
|
delay = set_scc_power(info, 1);
|
|
|
|
setup_scc(info);
|
|
|
|
if (delay) {
|
|
unsigned long flags;
|
|
|
|
/* delay is in ms */
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
info->power_wait = 1;
|
|
mod_timer(&info->powerup_timer,
|
|
jiffies + (delay * HZ + 999) / 1000);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
OPNDBG("enabling IRQ on ttyS%d (irq %d)...\n", info->line, info->irq);
|
|
|
|
info->flags |= ZILOG_INITIALIZED;
|
|
enable_irq(info->irq);
|
|
if (info->dma_initted) {
|
|
enable_irq(info->rx_dma_irq);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static _INLINE_ void rxdma_start(struct mac_serial * info, int curr)
|
|
{
|
|
volatile struct dbdma_regs *rd = &info->rx->dma;
|
|
volatile struct dbdma_cmd *cd = info->rx_cmds[curr];
|
|
|
|
//printk(KERN_DEBUG "SCC: rxdma_start\n");
|
|
|
|
st_le32(&rd->cmdptr, virt_to_bus(cd));
|
|
out_le32(&rd->control, (RUN << 16) | RUN);
|
|
}
|
|
|
|
static void rxdma_to_tty(struct mac_serial *info)
|
|
{
|
|
struct tty_struct *tty = info->tty;
|
|
volatile struct dbdma_regs *rd = &info->rx->dma;
|
|
unsigned long flags;
|
|
int residue, available, space, do_queue;
|
|
|
|
if (!tty)
|
|
return;
|
|
|
|
do_queue = 0;
|
|
spin_lock_irqsave(&info->rx_dma_lock, flags);
|
|
more:
|
|
space = TTY_FLIPBUF_SIZE - tty->flip.count;
|
|
if (!space) {
|
|
do_queue++;
|
|
goto out;
|
|
}
|
|
residue = 0;
|
|
if (info->rx_ubuf == info->rx_cbuf) {
|
|
if ((ld_le32(&rd->status) & ACTIVE) != 0) {
|
|
dbdma_flush(rd);
|
|
if (in_le32(&rd->cmdptr)
|
|
== virt_to_bus(info->rx_cmds[info->rx_cbuf]+1))
|
|
residue = in_le16(&info->rx->res_count);
|
|
}
|
|
}
|
|
available = RX_BUF_SIZE - residue - info->rx_done_bytes;
|
|
if (available > space)
|
|
available = space;
|
|
if (available) {
|
|
memcpy(tty->flip.char_buf_ptr,
|
|
info->rx_char_buf[info->rx_ubuf] + info->rx_done_bytes,
|
|
available);
|
|
memcpy(tty->flip.flag_buf_ptr,
|
|
info->rx_flag_buf[info->rx_ubuf] + info->rx_done_bytes,
|
|
available);
|
|
tty->flip.char_buf_ptr += available;
|
|
tty->flip.count += available;
|
|
tty->flip.flag_buf_ptr += available;
|
|
memset(info->rx_flag_buf[info->rx_ubuf] + info->rx_done_bytes,
|
|
0, available);
|
|
info->rx_done_bytes += available;
|
|
do_queue++;
|
|
}
|
|
if (info->rx_done_bytes == RX_BUF_SIZE) {
|
|
volatile struct dbdma_cmd *cd = info->rx_cmds[info->rx_ubuf];
|
|
|
|
if (info->rx_ubuf == info->rx_cbuf)
|
|
goto out;
|
|
/* mark rx_char_buf[rx_ubuf] free */
|
|
st_le16(&cd->command, DBDMA_NOP);
|
|
cd++;
|
|
st_le32(&cd->cmd_dep, 0);
|
|
st_le32((unsigned int *)&cd->res_count, 0);
|
|
cd++;
|
|
st_le16(&cd->xfer_status, 0);
|
|
|
|
if (info->rx_fbuf == RX_NO_FBUF) {
|
|
info->rx_fbuf = info->rx_ubuf;
|
|
if (!(ld_le32(&rd->status) & ACTIVE)) {
|
|
dbdma_reset(&info->rx->dma);
|
|
rxdma_start(info, info->rx_ubuf);
|
|
info->rx_cbuf = info->rx_ubuf;
|
|
}
|
|
}
|
|
info->rx_done_bytes = 0;
|
|
if (++info->rx_ubuf == info->rx_nbuf)
|
|
info->rx_ubuf = 0;
|
|
if (info->rx_fbuf == info->rx_ubuf)
|
|
info->rx_fbuf = RX_NO_FBUF;
|
|
goto more;
|
|
}
|
|
out:
|
|
spin_unlock_irqrestore(&info->rx_dma_lock, flags);
|
|
if (do_queue)
|
|
tty_flip_buffer_push(tty);
|
|
}
|
|
|
|
static void poll_rxdma(unsigned long private_)
|
|
{
|
|
struct mac_serial *info = (struct mac_serial *) private_;
|
|
unsigned long flags;
|
|
|
|
rxdma_to_tty(info);
|
|
spin_lock_irqsave(&info->rx_dma_lock, flags);
|
|
mod_timer(&info->poll_dma_timer, RX_DMA_TIMER);
|
|
spin_unlock_irqrestore(&info->rx_dma_lock, flags);
|
|
}
|
|
|
|
static void dma_init(struct mac_serial * info)
|
|
{
|
|
int i, size;
|
|
volatile struct dbdma_cmd *cd;
|
|
unsigned char *p;
|
|
|
|
info->rx_nbuf = 8;
|
|
|
|
/* various mem set up */
|
|
size = sizeof(struct dbdma_cmd) * (3 * info->rx_nbuf + 2)
|
|
+ (RX_BUF_SIZE * 2 + sizeof(*info->rx_cmds)
|
|
+ sizeof(*info->rx_char_buf) + sizeof(*info->rx_flag_buf))
|
|
* info->rx_nbuf;
|
|
info->dma_priv = kmalloc(size, GFP_KERNEL | GFP_DMA);
|
|
if (info->dma_priv == NULL)
|
|
return;
|
|
memset(info->dma_priv, 0, size);
|
|
|
|
info->rx_cmds = (volatile struct dbdma_cmd **)info->dma_priv;
|
|
info->rx_char_buf = (unsigned char **) (info->rx_cmds + info->rx_nbuf);
|
|
info->rx_flag_buf = info->rx_char_buf + info->rx_nbuf;
|
|
p = (unsigned char *) (info->rx_flag_buf + info->rx_nbuf);
|
|
for (i = 0; i < info->rx_nbuf; i++, p += RX_BUF_SIZE)
|
|
info->rx_char_buf[i] = p;
|
|
for (i = 0; i < info->rx_nbuf; i++, p += RX_BUF_SIZE)
|
|
info->rx_flag_buf[i] = p;
|
|
|
|
/* a bit of DMA programming */
|
|
cd = info->rx_cmds[0] = (volatile struct dbdma_cmd *) DBDMA_ALIGN(p);
|
|
st_le16(&cd->command, DBDMA_NOP);
|
|
cd++;
|
|
st_le16(&cd->req_count, RX_BUF_SIZE);
|
|
st_le16(&cd->command, INPUT_MORE);
|
|
st_le32(&cd->phy_addr, virt_to_bus(info->rx_char_buf[0]));
|
|
cd++;
|
|
st_le16(&cd->req_count, 4);
|
|
st_le16(&cd->command, STORE_WORD | INTR_ALWAYS);
|
|
st_le32(&cd->phy_addr, virt_to_bus(cd-2));
|
|
st_le32(&cd->cmd_dep, DBDMA_STOP);
|
|
for (i = 1; i < info->rx_nbuf; i++) {
|
|
info->rx_cmds[i] = ++cd;
|
|
st_le16(&cd->command, DBDMA_NOP);
|
|
cd++;
|
|
st_le16(&cd->req_count, RX_BUF_SIZE);
|
|
st_le16(&cd->command, INPUT_MORE);
|
|
st_le32(&cd->phy_addr, virt_to_bus(info->rx_char_buf[i]));
|
|
cd++;
|
|
st_le16(&cd->req_count, 4);
|
|
st_le16(&cd->command, STORE_WORD | INTR_ALWAYS);
|
|
st_le32(&cd->phy_addr, virt_to_bus(cd-2));
|
|
st_le32(&cd->cmd_dep, DBDMA_STOP);
|
|
}
|
|
cd++;
|
|
st_le16(&cd->command, DBDMA_NOP | BR_ALWAYS);
|
|
st_le32(&cd->cmd_dep, virt_to_bus(info->rx_cmds[0]));
|
|
|
|
/* setup DMA to our liking */
|
|
dbdma_reset(&info->rx->dma);
|
|
st_le32(&info->rx->dma.intr_sel, 0x10001);
|
|
st_le32(&info->rx->dma.br_sel, 0x10001);
|
|
out_le32(&info->rx->dma.wait_sel, 0x10001);
|
|
|
|
/* set various flags */
|
|
info->rx_ubuf = 0;
|
|
info->rx_cbuf = 0;
|
|
info->rx_fbuf = info->rx_ubuf + 1;
|
|
if (info->rx_fbuf == info->rx_nbuf)
|
|
info->rx_fbuf = RX_NO_FBUF;
|
|
info->rx_done_bytes = 0;
|
|
|
|
/* setup polling */
|
|
init_timer(&info->poll_dma_timer);
|
|
info->poll_dma_timer.function = (void *)&poll_rxdma;
|
|
info->poll_dma_timer.data = (unsigned long)info;
|
|
|
|
info->dma_initted = 1;
|
|
}
|
|
|
|
/*
|
|
* FixZeroBug....Works around a bug in the SCC receving channel.
|
|
* Taken from Darwin code, 15 Sept. 2000 -DanM
|
|
*
|
|
* The following sequence prevents a problem that is seen with O'Hare ASICs
|
|
* (most versions -- also with some Heathrow and Hydra ASICs) where a zero
|
|
* at the input to the receiver becomes 'stuck' and locks up the receiver.
|
|
* This problem can occur as a result of a zero bit at the receiver input
|
|
* coincident with any of the following events:
|
|
*
|
|
* The SCC is initialized (hardware or software).
|
|
* A framing error is detected.
|
|
* The clocking option changes from synchronous or X1 asynchronous
|
|
* clocking to X16, X32, or X64 asynchronous clocking.
|
|
* The decoding mode is changed among NRZ, NRZI, FM0, or FM1.
|
|
*
|
|
* This workaround attempts to recover from the lockup condition by placing
|
|
* the SCC in synchronous loopback mode with a fast clock before programming
|
|
* any of the asynchronous modes.
|
|
*/
|
|
static void fix_zero_bug_scc(struct mac_serial * info)
|
|
{
|
|
write_zsreg(info->zs_channel, 9,
|
|
(info->zs_channel == info->zs_chan_a? CHRA: CHRB));
|
|
udelay(10);
|
|
write_zsreg(info->zs_channel, 9,
|
|
((info->zs_channel == info->zs_chan_a? CHRA: CHRB) | NV));
|
|
|
|
write_zsreg(info->zs_channel, 4, (X1CLK | EXTSYNC));
|
|
|
|
/* I think this is wrong....but, I just copying code....
|
|
*/
|
|
write_zsreg(info->zs_channel, 3, (8 & ~RxENABLE));
|
|
|
|
write_zsreg(info->zs_channel, 5, (8 & ~TxENAB));
|
|
write_zsreg(info->zs_channel, 9, NV); /* Didn't we already do this? */
|
|
write_zsreg(info->zs_channel, 11, (RCBR | TCBR));
|
|
write_zsreg(info->zs_channel, 12, 0);
|
|
write_zsreg(info->zs_channel, 13, 0);
|
|
write_zsreg(info->zs_channel, 14, (LOOPBAK | SSBR));
|
|
write_zsreg(info->zs_channel, 14, (LOOPBAK | SSBR | BRENABL));
|
|
write_zsreg(info->zs_channel, 3, (8 | RxENABLE));
|
|
write_zsreg(info->zs_channel, 0, RES_EXT_INT);
|
|
write_zsreg(info->zs_channel, 0, RES_EXT_INT); /* to kill some time */
|
|
|
|
/* The channel should be OK now, but it is probably receiving
|
|
* loopback garbage.
|
|
* Switch to asynchronous mode, disable the receiver,
|
|
* and discard everything in the receive buffer.
|
|
*/
|
|
write_zsreg(info->zs_channel, 9, NV);
|
|
write_zsreg(info->zs_channel, 4, PAR_ENA);
|
|
write_zsreg(info->zs_channel, 3, (8 & ~RxENABLE));
|
|
|
|
while (read_zsreg(info->zs_channel, 0) & Rx_CH_AV) {
|
|
(void)read_zsreg(info->zs_channel, 8);
|
|
write_zsreg(info->zs_channel, 0, RES_EXT_INT);
|
|
write_zsreg(info->zs_channel, 0, ERR_RES);
|
|
}
|
|
}
|
|
|
|
static int setup_scc(struct mac_serial * info)
|
|
{
|
|
unsigned long flags;
|
|
|
|
OPNDBG("setting up ttyS%d SCC...\n", info->line);
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
|
|
/* Nice buggy HW ... */
|
|
fix_zero_bug_scc(info);
|
|
|
|
/*
|
|
* Reset the chip.
|
|
*/
|
|
write_zsreg(info->zs_channel, 9,
|
|
(info->zs_channel == info->zs_chan_a? CHRA: CHRB));
|
|
udelay(10);
|
|
write_zsreg(info->zs_channel, 9, 0);
|
|
|
|
/*
|
|
* Clear the receive FIFO.
|
|
*/
|
|
ZS_CLEARFIFO(info->zs_channel);
|
|
info->xmit_fifo_size = 1;
|
|
|
|
/*
|
|
* Reset DMAs
|
|
*/
|
|
if (info->has_dma)
|
|
dma_init(info);
|
|
|
|
/*
|
|
* Clear the interrupt registers.
|
|
*/
|
|
write_zsreg(info->zs_channel, 0, ERR_RES);
|
|
write_zsreg(info->zs_channel, 0, RES_H_IUS);
|
|
|
|
/*
|
|
* Turn on RTS and DTR.
|
|
*/
|
|
if (!info->is_irda)
|
|
zs_rtsdtr(info, 1);
|
|
|
|
/*
|
|
* Finally, enable sequencing and interrupts
|
|
*/
|
|
if (!info->dma_initted) {
|
|
/* interrupt on ext/status changes, all received chars,
|
|
transmit ready */
|
|
info->curregs[1] = (info->curregs[1] & ~0x18)
|
|
| (EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB);
|
|
} else {
|
|
/* interrupt on ext/status changes, W/Req pin is
|
|
receive DMA request */
|
|
info->curregs[1] = (info->curregs[1] & ~(0x18 | TxINT_ENAB))
|
|
| (EXT_INT_ENAB | WT_RDY_RT | WT_FN_RDYFN);
|
|
write_zsreg(info->zs_channel, 1, info->curregs[1]);
|
|
/* enable W/Req pin */
|
|
info->curregs[1] |= WT_RDY_ENAB;
|
|
write_zsreg(info->zs_channel, 1, info->curregs[1]);
|
|
/* enable interrupts on transmit ready and receive errors */
|
|
info->curregs[1] |= INT_ERR_Rx | TxINT_ENAB;
|
|
}
|
|
info->pendregs[1] = info->curregs[1];
|
|
info->curregs[3] |= (RxENABLE | Rx8);
|
|
info->pendregs[3] = info->curregs[3];
|
|
info->curregs[5] |= (TxENAB | Tx8);
|
|
info->pendregs[5] = info->curregs[5];
|
|
info->curregs[9] |= (NV | MIE);
|
|
info->pendregs[9] = info->curregs[9];
|
|
write_zsreg(info->zs_channel, 3, info->curregs[3]);
|
|
write_zsreg(info->zs_channel, 5, info->curregs[5]);
|
|
write_zsreg(info->zs_channel, 9, info->curregs[9]);
|
|
|
|
if (info->tty)
|
|
clear_bit(TTY_IO_ERROR, &info->tty->flags);
|
|
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
|
|
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
|
|
/*
|
|
* Set the speed of the serial port
|
|
*/
|
|
change_speed(info, 0);
|
|
|
|
/* Save the current value of RR0 */
|
|
info->read_reg_zero = read_zsreg(info->zs_channel, 0);
|
|
|
|
if (info->dma_initted) {
|
|
spin_lock_irqsave(&info->rx_dma_lock, flags);
|
|
rxdma_start(info, 0);
|
|
info->poll_dma_timer.expires = RX_DMA_TIMER;
|
|
add_timer(&info->poll_dma_timer);
|
|
spin_unlock_irqrestore(&info->rx_dma_lock, flags);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This routine will shutdown a serial port; interrupts are disabled, and
|
|
* DTR is dropped if the hangup on close termio flag is on.
|
|
*/
|
|
static void shutdown(struct mac_serial * info)
|
|
{
|
|
OPNDBG("Shutting down serial port %d (irq %d)....\n", info->line,
|
|
info->irq);
|
|
|
|
if (!(info->flags & ZILOG_INITIALIZED)) {
|
|
OPNDBG("(already shutdown)\n");
|
|
return;
|
|
}
|
|
|
|
if (info->has_dma) {
|
|
del_timer(&info->poll_dma_timer);
|
|
dbdma_reset(info->tx_dma);
|
|
dbdma_reset(&info->rx->dma);
|
|
disable_irq(info->tx_dma_irq);
|
|
disable_irq(info->rx_dma_irq);
|
|
}
|
|
disable_irq(info->irq);
|
|
|
|
info->pendregs[1] = info->curregs[1] = 0;
|
|
write_zsreg(info->zs_channel, 1, 0); /* no interrupts */
|
|
|
|
info->curregs[3] &= ~RxENABLE;
|
|
info->pendregs[3] = info->curregs[3];
|
|
write_zsreg(info->zs_channel, 3, info->curregs[3]);
|
|
|
|
info->curregs[5] &= ~TxENAB;
|
|
if (!info->tty || C_HUPCL(info->tty))
|
|
info->curregs[5] &= ~DTR;
|
|
info->pendregs[5] = info->curregs[5];
|
|
write_zsreg(info->zs_channel, 5, info->curregs[5]);
|
|
|
|
if (info->tty)
|
|
set_bit(TTY_IO_ERROR, &info->tty->flags);
|
|
|
|
set_scc_power(info, 0);
|
|
|
|
if (info->xmit_buf) {
|
|
free_page((unsigned long) info->xmit_buf);
|
|
info->xmit_buf = 0;
|
|
}
|
|
|
|
if (info->has_dma && info->dma_priv) {
|
|
kfree(info->dma_priv);
|
|
info->dma_priv = NULL;
|
|
info->dma_initted = 0;
|
|
}
|
|
|
|
memset(info->curregs, 0, sizeof(info->curregs));
|
|
memset(info->pendregs, 0, sizeof(info->pendregs));
|
|
|
|
info->flags &= ~ZILOG_INITIALIZED;
|
|
}
|
|
|
|
/*
|
|
* Turn power on or off to the SCC and associated stuff
|
|
* (port drivers, modem, IR port, etc.)
|
|
* Returns the number of milliseconds we should wait before
|
|
* trying to use the port.
|
|
*/
|
|
static int set_scc_power(struct mac_serial * info, int state)
|
|
{
|
|
int delay = 0;
|
|
|
|
if (state) {
|
|
PWRDBG("ttyS%d: powering up hardware\n", info->line);
|
|
pmac_call_feature(
|
|
PMAC_FTR_SCC_ENABLE,
|
|
info->dev_node, info->port_type, 1);
|
|
if (info->is_internal_modem) {
|
|
pmac_call_feature(
|
|
PMAC_FTR_MODEM_ENABLE,
|
|
info->dev_node, 0, 1);
|
|
delay = 2500; /* wait for 2.5s before using */
|
|
} else if (info->is_irda)
|
|
mdelay(50); /* Do better here once the problems
|
|
* with blocking have been ironed out
|
|
*/
|
|
} else {
|
|
/* TODO: Make that depend on a timer, don't power down
|
|
* immediately
|
|
*/
|
|
PWRDBG("ttyS%d: shutting down hardware\n", info->line);
|
|
if (info->is_internal_modem) {
|
|
PWRDBG("ttyS%d: shutting down modem\n", info->line);
|
|
pmac_call_feature(
|
|
PMAC_FTR_MODEM_ENABLE,
|
|
info->dev_node, 0, 0);
|
|
}
|
|
pmac_call_feature(
|
|
PMAC_FTR_SCC_ENABLE,
|
|
info->dev_node, info->port_type, 0);
|
|
}
|
|
return delay;
|
|
}
|
|
|
|
static void irda_rts_pulses(struct mac_serial *info, int w)
|
|
{
|
|
udelay(w);
|
|
write_zsreg(info->zs_channel, 5, Tx8 | TxENAB);
|
|
udelay(2);
|
|
write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS);
|
|
udelay(8);
|
|
write_zsreg(info->zs_channel, 5, Tx8 | TxENAB);
|
|
udelay(4);
|
|
write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS);
|
|
}
|
|
|
|
/*
|
|
* Set the irda codec on the imac to the specified baud rate.
|
|
*/
|
|
static void irda_setup(struct mac_serial *info)
|
|
{
|
|
int code, speed, t;
|
|
|
|
speed = info->tty->termios->c_cflag & CBAUD;
|
|
if (speed < B2400 || speed > B115200)
|
|
return;
|
|
code = 0x4d + B115200 - speed;
|
|
|
|
/* disable serial interrupts and receive DMA */
|
|
write_zsreg(info->zs_channel, 1, info->curregs[1] & ~0x9f);
|
|
|
|
/* wait for transmitter to drain */
|
|
t = 10000;
|
|
while ((read_zsreg(info->zs_channel, 0) & Tx_BUF_EMP) == 0
|
|
|| (read_zsreg(info->zs_channel, 1) & ALL_SNT) == 0) {
|
|
if (--t <= 0) {
|
|
printk(KERN_ERR "transmitter didn't drain\n");
|
|
return;
|
|
}
|
|
udelay(10);
|
|
}
|
|
udelay(100);
|
|
|
|
/* set to 8 bits, no parity, 19200 baud, RTS on, DTR off */
|
|
write_zsreg(info->zs_channel, 4, X16CLK | SB1);
|
|
write_zsreg(info->zs_channel, 11, TCBR | RCBR);
|
|
t = BPS_TO_BRG(19200, ZS_CLOCK/16);
|
|
write_zsreg(info->zs_channel, 12, t);
|
|
write_zsreg(info->zs_channel, 13, t >> 8);
|
|
write_zsreg(info->zs_channel, 14, BRENABL);
|
|
write_zsreg(info->zs_channel, 3, Rx8 | RxENABLE);
|
|
write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS);
|
|
|
|
/* set TxD low for ~104us and pulse RTS */
|
|
udelay(1000);
|
|
write_zsdata(info->zs_channel, 0xfe);
|
|
irda_rts_pulses(info, 150);
|
|
irda_rts_pulses(info, 180);
|
|
irda_rts_pulses(info, 50);
|
|
udelay(100);
|
|
|
|
/* assert DTR, wait 30ms, talk to the chip */
|
|
write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS | DTR);
|
|
mdelay(30);
|
|
while (read_zsreg(info->zs_channel, 0) & Rx_CH_AV)
|
|
read_zsdata(info->zs_channel);
|
|
|
|
write_zsdata(info->zs_channel, 1);
|
|
t = 1000;
|
|
while ((read_zsreg(info->zs_channel, 0) & Rx_CH_AV) == 0) {
|
|
if (--t <= 0) {
|
|
printk(KERN_ERR "irda_setup timed out on 1st byte\n");
|
|
goto out;
|
|
}
|
|
udelay(10);
|
|
}
|
|
t = read_zsdata(info->zs_channel);
|
|
if (t != 4)
|
|
printk(KERN_ERR "irda_setup 1st byte = %x\n", t);
|
|
|
|
write_zsdata(info->zs_channel, code);
|
|
t = 1000;
|
|
while ((read_zsreg(info->zs_channel, 0) & Rx_CH_AV) == 0) {
|
|
if (--t <= 0) {
|
|
printk(KERN_ERR "irda_setup timed out on 2nd byte\n");
|
|
goto out;
|
|
}
|
|
udelay(10);
|
|
}
|
|
t = read_zsdata(info->zs_channel);
|
|
if (t != code)
|
|
printk(KERN_ERR "irda_setup 2nd byte = %x (%x)\n", t, code);
|
|
|
|
/* Drop DTR again and do some more RTS pulses */
|
|
out:
|
|
udelay(100);
|
|
write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS);
|
|
irda_rts_pulses(info, 80);
|
|
|
|
/* We should be right to go now. We assume that load_zsregs
|
|
will get called soon to load up the correct baud rate etc. */
|
|
info->curregs[5] = (info->curregs[5] | RTS) & ~DTR;
|
|
info->pendregs[5] = info->curregs[5];
|
|
}
|
|
|
|
/*
|
|
* This routine is called to set the UART divisor registers to match
|
|
* the specified baud rate for a serial port.
|
|
*/
|
|
static void change_speed(struct mac_serial *info, struct termios *old_termios)
|
|
{
|
|
unsigned cflag;
|
|
int bits;
|
|
int brg, baud;
|
|
unsigned long flags;
|
|
|
|
if (!info->tty || !info->tty->termios)
|
|
return;
|
|
|
|
cflag = info->tty->termios->c_cflag;
|
|
baud = tty_get_baud_rate(info->tty);
|
|
if (baud == 0) {
|
|
if (old_termios) {
|
|
info->tty->termios->c_cflag &= ~CBAUD;
|
|
info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
|
|
cflag = info->tty->termios->c_cflag;
|
|
baud = tty_get_baud_rate(info->tty);
|
|
}
|
|
else
|
|
baud = info->zs_baud;
|
|
}
|
|
if (baud > 230400)
|
|
baud = 230400;
|
|
else if (baud == 0)
|
|
baud = 38400;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
info->zs_baud = baud;
|
|
info->clk_divisor = 16;
|
|
|
|
BAUDBG(KERN_DEBUG "set speed to %d bds, ", baud);
|
|
|
|
switch (baud) {
|
|
case ZS_CLOCK/16: /* 230400 */
|
|
info->curregs[4] = X16CLK;
|
|
info->curregs[11] = 0;
|
|
break;
|
|
case ZS_CLOCK/32: /* 115200 */
|
|
info->curregs[4] = X32CLK;
|
|
info->curregs[11] = 0;
|
|
break;
|
|
default:
|
|
info->curregs[4] = X16CLK;
|
|
info->curregs[11] = TCBR | RCBR;
|
|
brg = BPS_TO_BRG(baud, ZS_CLOCK/info->clk_divisor);
|
|
info->curregs[12] = (brg & 255);
|
|
info->curregs[13] = ((brg >> 8) & 255);
|
|
info->curregs[14] = BRENABL;
|
|
}
|
|
|
|
/* byte size and parity */
|
|
info->curregs[3] &= ~RxNBITS_MASK;
|
|
info->curregs[5] &= ~TxNBITS_MASK;
|
|
switch (cflag & CSIZE) {
|
|
case CS5:
|
|
info->curregs[3] |= Rx5;
|
|
info->curregs[5] |= Tx5;
|
|
BAUDBG("5 bits, ");
|
|
bits = 7;
|
|
break;
|
|
case CS6:
|
|
info->curregs[3] |= Rx6;
|
|
info->curregs[5] |= Tx6;
|
|
BAUDBG("6 bits, ");
|
|
bits = 8;
|
|
break;
|
|
case CS7:
|
|
info->curregs[3] |= Rx7;
|
|
info->curregs[5] |= Tx7;
|
|
BAUDBG("7 bits, ");
|
|
bits = 9;
|
|
break;
|
|
case CS8:
|
|
default: /* defaults to 8 bits */
|
|
info->curregs[3] |= Rx8;
|
|
info->curregs[5] |= Tx8;
|
|
BAUDBG("8 bits, ");
|
|
bits = 10;
|
|
break;
|
|
}
|
|
info->pendregs[3] = info->curregs[3];
|
|
info->pendregs[5] = info->curregs[5];
|
|
|
|
info->curregs[4] &= ~(SB_MASK | PAR_ENA | PAR_EVEN);
|
|
if (cflag & CSTOPB) {
|
|
info->curregs[4] |= SB2;
|
|
bits++;
|
|
BAUDBG("2 stop, ");
|
|
} else {
|
|
info->curregs[4] |= SB1;
|
|
BAUDBG("1 stop, ");
|
|
}
|
|
if (cflag & PARENB) {
|
|
bits++;
|
|
info->curregs[4] |= PAR_ENA;
|
|
BAUDBG("parity, ");
|
|
}
|
|
if (!(cflag & PARODD)) {
|
|
info->curregs[4] |= PAR_EVEN;
|
|
}
|
|
info->pendregs[4] = info->curregs[4];
|
|
|
|
if (!(cflag & CLOCAL)) {
|
|
if (!(info->curregs[15] & DCDIE))
|
|
info->read_reg_zero = read_zsreg(info->zs_channel, 0);
|
|
info->curregs[15] |= DCDIE;
|
|
} else
|
|
info->curregs[15] &= ~DCDIE;
|
|
if (cflag & CRTSCTS) {
|
|
info->curregs[15] |= CTSIE;
|
|
if ((read_zsreg(info->zs_channel, 0) & CTS) != 0)
|
|
info->tx_stopped = 1;
|
|
} else {
|
|
info->curregs[15] &= ~CTSIE;
|
|
info->tx_stopped = 0;
|
|
}
|
|
info->pendregs[15] = info->curregs[15];
|
|
|
|
/* Calc timeout value. This is pretty broken with high baud rates with HZ=100.
|
|
This code would love a larger HZ and a >1 fifo size, but this is not
|
|
a priority. The resulting value must be >HZ/2
|
|
*/
|
|
info->timeout = ((info->xmit_fifo_size*HZ*bits) / baud);
|
|
info->timeout += HZ/50+1; /* Add .02 seconds of slop */
|
|
|
|
BAUDBG("timeout=%d/%ds, base:%d\n", (int)info->timeout, (int)HZ,
|
|
(int)info->baud_base);
|
|
|
|
/* set the irda codec to the right rate */
|
|
if (info->is_irda)
|
|
irda_setup(info);
|
|
|
|
/* Load up the new values */
|
|
load_zsregs(info->zs_channel, info->curregs);
|
|
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
static void rs_flush_chars(struct tty_struct *tty)
|
|
{
|
|
struct mac_serial *info = (struct mac_serial *)tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
|
|
return;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
if (!(info->xmit_cnt <= 0 || tty->stopped || info->tx_stopped ||
|
|
!info->xmit_buf))
|
|
/* Enable transmitter */
|
|
transmit_chars(info);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
static int rs_write(struct tty_struct * tty,
|
|
const unsigned char *buf, int count)
|
|
{
|
|
int c, ret = 0;
|
|
struct mac_serial *info = (struct mac_serial *)tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_write"))
|
|
return 0;
|
|
|
|
if (!tty || !info->xmit_buf || !tmp_buf)
|
|
return 0;
|
|
|
|
while (1) {
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
|
|
SERIAL_XMIT_SIZE - info->xmit_head));
|
|
if (c <= 0) {
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
break;
|
|
}
|
|
memcpy(info->xmit_buf + info->xmit_head, buf, c);
|
|
info->xmit_head = ((info->xmit_head + c) &
|
|
(SERIAL_XMIT_SIZE-1));
|
|
info->xmit_cnt += c;
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
buf += c;
|
|
count -= c;
|
|
ret += c;
|
|
}
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
if (info->xmit_cnt && !tty->stopped && !info->tx_stopped
|
|
&& !info->tx_active)
|
|
transmit_chars(info);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
static int rs_write_room(struct tty_struct *tty)
|
|
{
|
|
struct mac_serial *info = (struct mac_serial *)tty->driver_data;
|
|
int ret;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_write_room"))
|
|
return 0;
|
|
ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
|
|
if (ret < 0)
|
|
ret = 0;
|
|
return ret;
|
|
}
|
|
|
|
static int rs_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
struct mac_serial *info = (struct mac_serial *)tty->driver_data;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
|
|
return 0;
|
|
return info->xmit_cnt;
|
|
}
|
|
|
|
static void rs_flush_buffer(struct tty_struct *tty)
|
|
{
|
|
struct mac_serial *info = (struct mac_serial *)tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
|
|
return;
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
tty_wakeup(tty);
|
|
}
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* rs_throttle()
|
|
*
|
|
* This routine is called by the upper-layer tty layer to signal that
|
|
* incoming characters should be throttled.
|
|
* ------------------------------------------------------------
|
|
*/
|
|
static void rs_throttle(struct tty_struct * tty)
|
|
{
|
|
struct mac_serial *info = (struct mac_serial *)tty->driver_data;
|
|
unsigned long flags;
|
|
#ifdef SERIAL_DEBUG_THROTTLE
|
|
printk(KERN_DEBUG "throttle %ld....\n",tty->ldisc.chars_in_buffer(tty));
|
|
#endif
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_throttle"))
|
|
return;
|
|
|
|
if (I_IXOFF(tty)) {
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
info->x_char = STOP_CHAR(tty);
|
|
if (!info->tx_active)
|
|
transmit_chars(info);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
if (C_CRTSCTS(tty)) {
|
|
/*
|
|
* Here we want to turn off the RTS line. On Macintoshes,
|
|
* the external serial ports using a DIN-8 or DIN-9
|
|
* connector only have the DTR line (which is usually
|
|
* wired to both RTS and DTR on an external modem in
|
|
* the cable). RTS doesn't go out to the serial port
|
|
* socket, it acts as an output enable for the transmit
|
|
* data line. So in this case we don't drop RTS.
|
|
*
|
|
* Macs with internal modems generally do have both RTS
|
|
* and DTR wired to the modem, so in that case we do
|
|
* drop RTS.
|
|
*/
|
|
if (info->is_internal_modem) {
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
info->curregs[5] &= ~RTS;
|
|
info->pendregs[5] &= ~RTS;
|
|
write_zsreg(info->zs_channel, 5, info->curregs[5]);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
}
|
|
|
|
#ifdef CDTRCTS
|
|
if (tty->termios->c_cflag & CDTRCTS) {
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
info->curregs[5] &= ~DTR;
|
|
info->pendregs[5] &= ~DTR;
|
|
write_zsreg(info->zs_channel, 5, info->curregs[5]);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
#endif /* CDTRCTS */
|
|
}
|
|
|
|
static void rs_unthrottle(struct tty_struct * tty)
|
|
{
|
|
struct mac_serial *info = (struct mac_serial *)tty->driver_data;
|
|
unsigned long flags;
|
|
#ifdef SERIAL_DEBUG_THROTTLE
|
|
printk(KERN_DEBUG "unthrottle %s: %d....\n",
|
|
tty->ldisc.chars_in_buffer(tty));
|
|
#endif
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
|
|
return;
|
|
|
|
if (I_IXOFF(tty)) {
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
if (info->x_char)
|
|
info->x_char = 0;
|
|
else {
|
|
info->x_char = START_CHAR(tty);
|
|
if (!info->tx_active)
|
|
transmit_chars(info);
|
|
}
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
if (C_CRTSCTS(tty) && info->is_internal_modem) {
|
|
/* Assert RTS line */
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
info->curregs[5] |= RTS;
|
|
info->pendregs[5] |= RTS;
|
|
write_zsreg(info->zs_channel, 5, info->curregs[5]);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
#ifdef CDTRCTS
|
|
if (tty->termios->c_cflag & CDTRCTS) {
|
|
/* Assert DTR line */
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
info->curregs[5] |= DTR;
|
|
info->pendregs[5] |= DTR;
|
|
write_zsreg(info->zs_channel, 5, info->curregs[5]);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* rs_ioctl() and friends
|
|
* ------------------------------------------------------------
|
|
*/
|
|
|
|
static int get_serial_info(struct mac_serial * info,
|
|
struct serial_struct __user * retinfo)
|
|
{
|
|
struct serial_struct tmp;
|
|
|
|
if (!retinfo)
|
|
return -EFAULT;
|
|
memset(&tmp, 0, sizeof(tmp));
|
|
tmp.type = info->type;
|
|
tmp.line = info->line;
|
|
tmp.port = info->port;
|
|
tmp.irq = info->irq;
|
|
tmp.flags = info->flags;
|
|
tmp.baud_base = info->baud_base;
|
|
tmp.close_delay = info->close_delay;
|
|
tmp.closing_wait = info->closing_wait;
|
|
tmp.custom_divisor = info->custom_divisor;
|
|
if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static int set_serial_info(struct mac_serial * info,
|
|
struct serial_struct __user * new_info)
|
|
{
|
|
struct serial_struct new_serial;
|
|
struct mac_serial old_info;
|
|
int retval = 0;
|
|
|
|
if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
|
|
return -EFAULT;
|
|
old_info = *info;
|
|
|
|
if (!capable(CAP_SYS_ADMIN)) {
|
|
if ((new_serial.baud_base != info->baud_base) ||
|
|
(new_serial.type != info->type) ||
|
|
(new_serial.close_delay != info->close_delay) ||
|
|
((new_serial.flags & ~ZILOG_USR_MASK) !=
|
|
(info->flags & ~ZILOG_USR_MASK)))
|
|
return -EPERM;
|
|
info->flags = ((info->flags & ~ZILOG_USR_MASK) |
|
|
(new_serial.flags & ZILOG_USR_MASK));
|
|
info->custom_divisor = new_serial.custom_divisor;
|
|
goto check_and_exit;
|
|
}
|
|
|
|
if (info->count > 1)
|
|
return -EBUSY;
|
|
|
|
/*
|
|
* OK, past this point, all the error checking has been done.
|
|
* At this point, we start making changes.....
|
|
*/
|
|
|
|
info->baud_base = new_serial.baud_base;
|
|
info->flags = ((info->flags & ~ZILOG_FLAGS) |
|
|
(new_serial.flags & ZILOG_FLAGS));
|
|
info->type = new_serial.type;
|
|
info->close_delay = new_serial.close_delay;
|
|
info->closing_wait = new_serial.closing_wait;
|
|
|
|
check_and_exit:
|
|
if (info->flags & ZILOG_INITIALIZED)
|
|
retval = setup_scc(info);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* get_lsr_info - get line status register info
|
|
*
|
|
* Purpose: Let user call ioctl() to get info when the UART physically
|
|
* is emptied. On bus types like RS485, the transmitter must
|
|
* release the bus after transmitting. This must be done when
|
|
* the transmit shift register is empty, not be done when the
|
|
* transmit holding register is empty. This functionality
|
|
* allows an RS485 driver to be written in user space.
|
|
*/
|
|
static int get_lsr_info(struct mac_serial * info, unsigned int *value)
|
|
{
|
|
unsigned char status;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
status = read_zsreg(info->zs_channel, 0);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
status = (status & Tx_BUF_EMP)? TIOCSER_TEMT: 0;
|
|
return put_user(status,value);
|
|
}
|
|
|
|
static int rs_tiocmget(struct tty_struct *tty, struct file *file)
|
|
{
|
|
struct mac_serial * info = (struct mac_serial *)tty->driver_data;
|
|
unsigned char control, status;
|
|
unsigned long flags;
|
|
|
|
#ifdef CONFIG_KGDB
|
|
if (info->kgdb_channel)
|
|
return -ENODEV;
|
|
#endif
|
|
if (serial_paranoia_check(info, tty->name, __FUNCTION__))
|
|
return -ENODEV;
|
|
|
|
if (tty->flags & (1 << TTY_IO_ERROR))
|
|
return -EIO;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
control = info->curregs[5];
|
|
status = read_zsreg(info->zs_channel, 0);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
return ((control & RTS) ? TIOCM_RTS: 0)
|
|
| ((control & DTR) ? TIOCM_DTR: 0)
|
|
| ((status & DCD) ? TIOCM_CAR: 0)
|
|
| ((status & CTS) ? 0: TIOCM_CTS);
|
|
}
|
|
|
|
static int rs_tiocmset(struct tty_struct *tty, struct file *file,
|
|
unsigned int set, unsigned int clear)
|
|
{
|
|
struct mac_serial * info = (struct mac_serial *)tty->driver_data;
|
|
unsigned int arg, bits;
|
|
unsigned long flags;
|
|
|
|
#ifdef CONFIG_KGDB
|
|
if (info->kgdb_channel)
|
|
return -ENODEV;
|
|
#endif
|
|
if (serial_paranoia_check(info, tty->name, __FUNCTION__))
|
|
return -ENODEV;
|
|
|
|
if (tty->flags & (1 << TTY_IO_ERROR))
|
|
return -EIO;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
if (set & TIOCM_RTS)
|
|
info->curregs[5] |= RTS;
|
|
if (set & TIOCM_DTR)
|
|
info->curregs[5] |= DTR;
|
|
if (clear & TIOCM_RTS)
|
|
info->curregs[5] &= ~RTS;
|
|
if (clear & TIOCM_DTR)
|
|
info->curregs[5] &= ~DTR;
|
|
|
|
info->pendregs[5] = info->curregs[5];
|
|
write_zsreg(info->zs_channel, 5, info->curregs[5]);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* rs_break - turn transmit break condition on/off
|
|
*/
|
|
static void rs_break(struct tty_struct *tty, int break_state)
|
|
{
|
|
struct mac_serial *info = (struct mac_serial *) tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_break"))
|
|
return;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
if (break_state == -1)
|
|
info->curregs[5] |= SND_BRK;
|
|
else
|
|
info->curregs[5] &= ~SND_BRK;
|
|
write_zsreg(info->zs_channel, 5, info->curregs[5]);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
static int rs_ioctl(struct tty_struct *tty, struct file * file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct mac_serial * info = (struct mac_serial *)tty->driver_data;
|
|
|
|
#ifdef CONFIG_KGDB
|
|
if (info->kgdb_channel)
|
|
return -ENODEV;
|
|
#endif
|
|
if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
|
|
return -ENODEV;
|
|
|
|
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
|
|
(cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT)) {
|
|
if (tty->flags & (1 << TTY_IO_ERROR))
|
|
return -EIO;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case TIOCGSERIAL:
|
|
return get_serial_info(info,
|
|
(struct serial_struct __user *) arg);
|
|
case TIOCSSERIAL:
|
|
return set_serial_info(info,
|
|
(struct serial_struct __user *) arg);
|
|
case TIOCSERGETLSR: /* Get line status register */
|
|
return get_lsr_info(info, (unsigned int *) arg);
|
|
|
|
case TIOCSERGSTRUCT:
|
|
if (copy_to_user((struct mac_serial __user *) arg,
|
|
info, sizeof(struct mac_serial)))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
|
|
{
|
|
struct mac_serial *info = (struct mac_serial *)tty->driver_data;
|
|
int was_stopped;
|
|
|
|
if (tty->termios->c_cflag == old_termios->c_cflag)
|
|
return;
|
|
was_stopped = info->tx_stopped;
|
|
|
|
change_speed(info, old_termios);
|
|
|
|
if (was_stopped && !info->tx_stopped) {
|
|
tty->hw_stopped = 0;
|
|
rs_start(tty);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* rs_close()
|
|
*
|
|
* This routine is called when the serial port gets closed.
|
|
* Wait for the last remaining data to be sent.
|
|
* ------------------------------------------------------------
|
|
*/
|
|
static void rs_close(struct tty_struct *tty, struct file * filp)
|
|
{
|
|
struct mac_serial * info = (struct mac_serial *)tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
|
|
return;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
|
|
if (tty_hung_up_p(filp)) {
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
return;
|
|
}
|
|
|
|
OPNDBG("rs_close ttyS%d, count = %d\n", info->line, info->count);
|
|
if ((tty->count == 1) && (info->count != 1)) {
|
|
/*
|
|
* Uh, oh. tty->count is 1, which means that the tty
|
|
* structure will be freed. Info->count should always
|
|
* be one in these conditions. If it's greater than
|
|
* one, we've got real problems, since it means the
|
|
* serial port won't be shutdown.
|
|
*/
|
|
printk(KERN_ERR "rs_close: bad serial port count; tty->count "
|
|
"is 1, info->count is %d\n", info->count);
|
|
info->count = 1;
|
|
}
|
|
if (--info->count < 0) {
|
|
printk(KERN_ERR "rs_close: bad serial port count for "
|
|
"ttyS%d: %d\n", info->line, info->count);
|
|
info->count = 0;
|
|
}
|
|
if (info->count) {
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
return;
|
|
}
|
|
info->flags |= ZILOG_CLOSING;
|
|
/*
|
|
* Now we wait for the transmit buffer to clear; and we notify
|
|
* the line discipline to only process XON/XOFF characters.
|
|
*/
|
|
OPNDBG("waiting end of Tx... (timeout:%d)\n", info->closing_wait);
|
|
tty->closing = 1;
|
|
if (info->closing_wait != ZILOG_CLOSING_WAIT_NONE) {
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
tty_wait_until_sent(tty, info->closing_wait);
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* At this point we stop accepting input. To do this, we
|
|
* disable the receiver and receive interrupts.
|
|
*/
|
|
info->curregs[3] &= ~RxENABLE;
|
|
info->pendregs[3] = info->curregs[3];
|
|
write_zsreg(info->zs_channel, 3, info->curregs[3]);
|
|
info->curregs[1] &= ~(0x18); /* disable any rx ints */
|
|
info->pendregs[1] = info->curregs[1];
|
|
write_zsreg(info->zs_channel, 1, info->curregs[1]);
|
|
ZS_CLEARFIFO(info->zs_channel);
|
|
if (info->flags & ZILOG_INITIALIZED) {
|
|
/*
|
|
* Before we drop DTR, make sure the SCC transmitter
|
|
* has completely drained.
|
|
*/
|
|
OPNDBG("waiting end of Rx...\n");
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
rs_wait_until_sent(tty, info->timeout);
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
}
|
|
|
|
shutdown(info);
|
|
/* restore flags now since shutdown() will have disabled this port's
|
|
specific irqs */
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
|
|
if (tty->driver->flush_buffer)
|
|
tty->driver->flush_buffer(tty);
|
|
tty_ldisc_flush(tty);
|
|
tty->closing = 0;
|
|
info->event = 0;
|
|
info->tty = 0;
|
|
|
|
if (info->blocked_open) {
|
|
if (info->close_delay) {
|
|
msleep_interruptible(jiffies_to_msecs(info->close_delay));
|
|
}
|
|
wake_up_interruptible(&info->open_wait);
|
|
}
|
|
info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CLOSING);
|
|
wake_up_interruptible(&info->close_wait);
|
|
}
|
|
|
|
/*
|
|
* rs_wait_until_sent() --- wait until the transmitter is empty
|
|
*/
|
|
static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
|
|
{
|
|
struct mac_serial *info = (struct mac_serial *) tty->driver_data;
|
|
unsigned long orig_jiffies, char_time;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
|
|
return;
|
|
|
|
/* printk("rs_wait_until_sent, timeout:%d, tty_stopped:%d, tx_stopped:%d\n",
|
|
timeout, tty->stopped, info->tx_stopped);
|
|
*/
|
|
orig_jiffies = jiffies;
|
|
/*
|
|
* Set the check interval to be 1/5 of the estimated time to
|
|
* send a single character, and make it at least 1. The check
|
|
* interval should also be less than the timeout.
|
|
*/
|
|
if (info->timeout <= HZ/50) {
|
|
printk(KERN_INFO "macserial: invalid info->timeout=%d\n",
|
|
info->timeout);
|
|
info->timeout = HZ/50+1;
|
|
}
|
|
|
|
char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
|
|
char_time = char_time / 5;
|
|
if (char_time > HZ) {
|
|
printk(KERN_WARNING "macserial: char_time %ld >HZ !!!\n",
|
|
char_time);
|
|
char_time = 1;
|
|
} else if (char_time == 0)
|
|
char_time = 1;
|
|
if (timeout)
|
|
char_time = min_t(unsigned long, char_time, timeout);
|
|
while ((read_zsreg(info->zs_channel, 1) & ALL_SNT) == 0) {
|
|
msleep_interruptible(jiffies_to_msecs(char_time));
|
|
if (signal_pending(current))
|
|
break;
|
|
if (timeout && time_after(jiffies, orig_jiffies + timeout))
|
|
break;
|
|
}
|
|
current->state = TASK_RUNNING;
|
|
}
|
|
|
|
/*
|
|
* rs_hangup() --- called by tty_hangup() when a hangup is signaled.
|
|
*/
|
|
static void rs_hangup(struct tty_struct *tty)
|
|
{
|
|
struct mac_serial * info = (struct mac_serial *)tty->driver_data;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_hangup"))
|
|
return;
|
|
|
|
rs_flush_buffer(tty);
|
|
shutdown(info);
|
|
info->event = 0;
|
|
info->count = 0;
|
|
info->flags &= ~ZILOG_NORMAL_ACTIVE;
|
|
info->tty = 0;
|
|
wake_up_interruptible(&info->open_wait);
|
|
}
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* rs_open() and friends
|
|
* ------------------------------------------------------------
|
|
*/
|
|
static int block_til_ready(struct tty_struct *tty, struct file * filp,
|
|
struct mac_serial *info)
|
|
{
|
|
DECLARE_WAITQUEUE(wait,current);
|
|
int retval;
|
|
int do_clocal = 0;
|
|
|
|
/*
|
|
* If the device is in the middle of being closed, then block
|
|
* until it's done, and then try again.
|
|
*/
|
|
if (info->flags & ZILOG_CLOSING) {
|
|
interruptible_sleep_on(&info->close_wait);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/*
|
|
* If non-blocking mode is set, or the port is not enabled,
|
|
* then make the check up front and then exit.
|
|
*/
|
|
if ((filp->f_flags & O_NONBLOCK) ||
|
|
(tty->flags & (1 << TTY_IO_ERROR))) {
|
|
info->flags |= ZILOG_NORMAL_ACTIVE;
|
|
return 0;
|
|
}
|
|
|
|
if (tty->termios->c_cflag & CLOCAL)
|
|
do_clocal = 1;
|
|
|
|
/*
|
|
* Block waiting for the carrier detect and the line to become
|
|
* free (i.e., not in use by the callout). While we are in
|
|
* this loop, info->count is dropped by one, so that
|
|
* rs_close() knows when to free things. We restore it upon
|
|
* exit, either normal or abnormal.
|
|
*/
|
|
retval = 0;
|
|
add_wait_queue(&info->open_wait, &wait);
|
|
OPNDBG("block_til_ready before block: ttyS%d, count = %d\n",
|
|
info->line, info->count);
|
|
spin_lock_irq(&info->lock);
|
|
if (!tty_hung_up_p(filp))
|
|
info->count--;
|
|
spin_unlock_irq(&info->lock);
|
|
info->blocked_open++;
|
|
while (1) {
|
|
spin_lock_irq(&info->lock);
|
|
if ((tty->termios->c_cflag & CBAUD) &&
|
|
!info->is_irda)
|
|
zs_rtsdtr(info, 1);
|
|
spin_unlock_irq(&info->lock);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
if (tty_hung_up_p(filp) ||
|
|
!(info->flags & ZILOG_INITIALIZED)) {
|
|
retval = -EAGAIN;
|
|
break;
|
|
}
|
|
if (!(info->flags & ZILOG_CLOSING) &&
|
|
(do_clocal || (read_zsreg(info->zs_channel, 0) & DCD)))
|
|
break;
|
|
if (signal_pending(current)) {
|
|
retval = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
OPNDBG("block_til_ready blocking: ttyS%d, count = %d\n",
|
|
info->line, info->count);
|
|
schedule();
|
|
}
|
|
current->state = TASK_RUNNING;
|
|
remove_wait_queue(&info->open_wait, &wait);
|
|
if (!tty_hung_up_p(filp))
|
|
info->count++;
|
|
info->blocked_open--;
|
|
OPNDBG("block_til_ready after blocking: ttyS%d, count = %d\n",
|
|
info->line, info->count);
|
|
if (retval)
|
|
return retval;
|
|
info->flags |= ZILOG_NORMAL_ACTIVE;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This routine is called whenever a serial port is opened. It
|
|
* enables interrupts for a serial port, linking in its ZILOG structure into
|
|
* the IRQ chain. It also performs the serial-specific
|
|
* initialization for the tty structure.
|
|
*/
|
|
static int rs_open(struct tty_struct *tty, struct file * filp)
|
|
{
|
|
struct mac_serial *info;
|
|
int retval, line;
|
|
unsigned long page;
|
|
|
|
line = tty->index;
|
|
if ((line < 0) || (line >= zs_channels_found)) {
|
|
return -ENODEV;
|
|
}
|
|
info = zs_soft + line;
|
|
|
|
#ifdef CONFIG_KGDB
|
|
if (info->kgdb_channel) {
|
|
return -ENODEV;
|
|
}
|
|
#endif
|
|
if (serial_paranoia_check(info, tty->name, "rs_open"))
|
|
return -ENODEV;
|
|
OPNDBG("rs_open %s, count = %d, tty=%p\n", tty->name,
|
|
info->count, tty);
|
|
|
|
info->count++;
|
|
tty->driver_data = info;
|
|
info->tty = tty;
|
|
|
|
if (!tmp_buf) {
|
|
page = get_zeroed_page(GFP_KERNEL);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
if (tmp_buf)
|
|
free_page(page);
|
|
else
|
|
tmp_buf = (unsigned char *) page;
|
|
}
|
|
|
|
/*
|
|
* If the port is the middle of closing, bail out now
|
|
*/
|
|
if (tty_hung_up_p(filp) ||
|
|
(info->flags & ZILOG_CLOSING)) {
|
|
if (info->flags & ZILOG_CLOSING)
|
|
interruptible_sleep_on(&info->close_wait);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/*
|
|
* Start up serial port
|
|
*/
|
|
|
|
retval = startup(info);
|
|
if (retval)
|
|
return retval;
|
|
|
|
retval = block_til_ready(tty, filp, info);
|
|
if (retval) {
|
|
OPNDBG("rs_open returning after block_til_ready with %d\n",
|
|
retval);
|
|
return retval;
|
|
}
|
|
|
|
#ifdef CONFIG_SERIAL_CONSOLE
|
|
if (sercons.cflag && sercons.index == line) {
|
|
tty->termios->c_cflag = sercons.cflag;
|
|
sercons.cflag = 0;
|
|
change_speed(info, 0);
|
|
}
|
|
#endif
|
|
|
|
OPNDBG("rs_open %s successful...\n", tty->name);
|
|
return 0;
|
|
}
|
|
|
|
/* Finally, routines used to initialize the serial driver. */
|
|
|
|
static void show_serial_version(void)
|
|
{
|
|
printk(KERN_INFO "PowerMac Z8530 serial driver version " MACSERIAL_VERSION "\n");
|
|
}
|
|
|
|
/*
|
|
* Initialize one channel, both the mac_serial and mac_zschannel
|
|
* structs. We use the dev_node field of the mac_serial struct.
|
|
*/
|
|
static int
|
|
chan_init(struct mac_serial *zss, struct mac_zschannel *zs_chan,
|
|
struct mac_zschannel *zs_chan_a)
|
|
{
|
|
struct device_node *ch = zss->dev_node;
|
|
char *conn;
|
|
int len;
|
|
struct slot_names_prop {
|
|
int count;
|
|
char name[1];
|
|
} *slots;
|
|
|
|
zss->irq = ch->intrs[0].line;
|
|
zss->has_dma = 0;
|
|
#if !defined(CONFIG_KGDB) && defined(SUPPORT_SERIAL_DMA)
|
|
if (ch->n_addrs >= 3 && ch->n_intrs == 3)
|
|
zss->has_dma = 1;
|
|
#endif
|
|
zss->dma_initted = 0;
|
|
|
|
zs_chan->control = (volatile unsigned char *)
|
|
ioremap(ch->addrs[0].address, 0x1000);
|
|
zs_chan->data = zs_chan->control + 0x10;
|
|
spin_lock_init(&zs_chan->lock);
|
|
zs_chan->parent = zss;
|
|
zss->zs_channel = zs_chan;
|
|
zss->zs_chan_a = zs_chan_a;
|
|
|
|
/* setup misc varariables */
|
|
zss->kgdb_channel = 0;
|
|
|
|
/* For now, we assume you either have a slot-names property
|
|
* with "Modem" in it, or your channel is compatible with
|
|
* "cobalt". Might need additional fixups
|
|
*/
|
|
zss->is_internal_modem = device_is_compatible(ch, "cobalt");
|
|
conn = get_property(ch, "AAPL,connector", &len);
|
|
zss->is_irda = conn && (strcmp(conn, "infrared") == 0);
|
|
zss->port_type = PMAC_SCC_ASYNC;
|
|
/* 1999 Powerbook G3 has slot-names property instead */
|
|
slots = (struct slot_names_prop *)get_property(ch, "slot-names", &len);
|
|
if (slots && slots->count > 0) {
|
|
if (strcmp(slots->name, "IrDA") == 0)
|
|
zss->is_irda = 1;
|
|
else if (strcmp(slots->name, "Modem") == 0)
|
|
zss->is_internal_modem = 1;
|
|
}
|
|
if (zss->is_irda)
|
|
zss->port_type = PMAC_SCC_IRDA;
|
|
if (zss->is_internal_modem) {
|
|
struct device_node* i2c_modem = find_devices("i2c-modem");
|
|
if (i2c_modem) {
|
|
char* mid = get_property(i2c_modem, "modem-id", NULL);
|
|
if (mid) switch(*mid) {
|
|
case 0x04 :
|
|
case 0x05 :
|
|
case 0x07 :
|
|
case 0x08 :
|
|
case 0x0b :
|
|
case 0x0c :
|
|
zss->port_type = PMAC_SCC_I2S1;
|
|
}
|
|
printk(KERN_INFO "macserial: i2c-modem detected, id: %d\n",
|
|
mid ? (*mid) : 0);
|
|
} else {
|
|
printk(KERN_INFO "macserial: serial modem detected\n");
|
|
}
|
|
}
|
|
|
|
while (zss->has_dma) {
|
|
zss->dma_priv = NULL;
|
|
/* it seems that the last two addresses are the
|
|
DMA controllers */
|
|
zss->tx_dma = (volatile struct dbdma_regs *)
|
|
ioremap(ch->addrs[ch->n_addrs - 2].address, 0x100);
|
|
zss->rx = (volatile struct mac_dma *)
|
|
ioremap(ch->addrs[ch->n_addrs - 1].address, 0x100);
|
|
zss->tx_dma_irq = ch->intrs[1].line;
|
|
zss->rx_dma_irq = ch->intrs[2].line;
|
|
spin_lock_init(&zss->rx_dma_lock);
|
|
break;
|
|
}
|
|
|
|
init_timer(&zss->powerup_timer);
|
|
zss->powerup_timer.function = powerup_done;
|
|
zss->powerup_timer.data = (unsigned long) zss;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* /proc fs routines. TODO: Add status lines & error stats
|
|
*/
|
|
static inline int
|
|
line_info(char *buf, struct mac_serial *info)
|
|
{
|
|
int ret=0;
|
|
unsigned char* connector;
|
|
int lenp;
|
|
|
|
ret += sprintf(buf, "%d: port:0x%X irq:%d", info->line, info->port, info->irq);
|
|
|
|
connector = get_property(info->dev_node, "AAPL,connector", &lenp);
|
|
if (connector)
|
|
ret+=sprintf(buf+ret," con:%s ", connector);
|
|
if (info->is_internal_modem) {
|
|
if (!connector)
|
|
ret+=sprintf(buf+ret," con:");
|
|
ret+=sprintf(buf+ret,"%s", " (internal modem)");
|
|
}
|
|
if (info->is_irda) {
|
|
if (!connector)
|
|
ret+=sprintf(buf+ret," con:");
|
|
ret+=sprintf(buf+ret,"%s", " (IrDA)");
|
|
}
|
|
ret+=sprintf(buf+ret,"\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
int macserial_read_proc(char *page, char **start, off_t off, int count,
|
|
int *eof, void *data)
|
|
{
|
|
int l, len = 0;
|
|
off_t begin = 0;
|
|
struct mac_serial *info;
|
|
|
|
len += sprintf(page, "serinfo:1.0 driver:" MACSERIAL_VERSION "\n");
|
|
for (info = zs_chain; info && len < 4000; info = info->zs_next) {
|
|
l = line_info(page + len, info);
|
|
len += l;
|
|
if (len+begin > off+count)
|
|
goto done;
|
|
if (len+begin < off) {
|
|
begin += len;
|
|
len = 0;
|
|
}
|
|
}
|
|
*eof = 1;
|
|
done:
|
|
if (off >= len+begin)
|
|
return 0;
|
|
*start = page + (off-begin);
|
|
return ((count < begin+len-off) ? count : begin+len-off);
|
|
}
|
|
|
|
/* Ask the PROM how many Z8530s we have and initialize their zs_channels */
|
|
static void
|
|
probe_sccs(void)
|
|
{
|
|
struct device_node *dev, *ch;
|
|
struct mac_serial **pp;
|
|
int n, chip, nchan;
|
|
struct mac_zschannel *zs_chan;
|
|
int chan_a_index;
|
|
|
|
n = 0;
|
|
pp = &zs_chain;
|
|
zs_chan = zs_channels;
|
|
for (dev = find_devices("escc"); dev != 0; dev = dev->next) {
|
|
nchan = 0;
|
|
chip = n;
|
|
if (n >= NUM_CHANNELS) {
|
|
printk(KERN_WARNING "Sorry, can't use %s: no more "
|
|
"channels\n", dev->full_name);
|
|
continue;
|
|
}
|
|
chan_a_index = 0;
|
|
for (ch = dev->child; ch != 0; ch = ch->sibling) {
|
|
if (nchan >= 2) {
|
|
printk(KERN_WARNING "SCC: Only 2 channels per "
|
|
"chip are supported\n");
|
|
break;
|
|
}
|
|
if (ch->n_addrs < 1 || (ch ->n_intrs < 1)) {
|
|
printk("Can't use %s: %d addrs %d intrs\n",
|
|
ch->full_name, ch->n_addrs, ch->n_intrs);
|
|
continue;
|
|
}
|
|
|
|
/* The channel with the higher address
|
|
will be the A side. */
|
|
if (nchan > 0 &&
|
|
ch->addrs[0].address
|
|
> zs_soft[n-1].dev_node->addrs[0].address)
|
|
chan_a_index = 1;
|
|
|
|
/* minimal initialization for now */
|
|
zs_soft[n].dev_node = ch;
|
|
*pp = &zs_soft[n];
|
|
pp = &zs_soft[n].zs_next;
|
|
++nchan;
|
|
++n;
|
|
}
|
|
if (nchan == 0)
|
|
continue;
|
|
|
|
/* set up A side */
|
|
if (chan_init(&zs_soft[chip + chan_a_index], zs_chan, zs_chan))
|
|
continue;
|
|
++zs_chan;
|
|
|
|
/* set up B side, if it exists */
|
|
if (nchan > 1)
|
|
if (chan_init(&zs_soft[chip + 1 - chan_a_index],
|
|
zs_chan, zs_chan - 1))
|
|
continue;
|
|
++zs_chan;
|
|
}
|
|
*pp = 0;
|
|
|
|
zs_channels_found = n;
|
|
#ifdef CONFIG_PMAC_PBOOK
|
|
if (n)
|
|
pmu_register_sleep_notifier(&serial_sleep_notifier);
|
|
#endif /* CONFIG_PMAC_PBOOK */
|
|
}
|
|
|
|
static struct tty_operations serial_ops = {
|
|
.open = rs_open,
|
|
.close = rs_close,
|
|
.write = rs_write,
|
|
.flush_chars = rs_flush_chars,
|
|
.write_room = rs_write_room,
|
|
.chars_in_buffer = rs_chars_in_buffer,
|
|
.flush_buffer = rs_flush_buffer,
|
|
.ioctl = rs_ioctl,
|
|
.throttle = rs_throttle,
|
|
.unthrottle = rs_unthrottle,
|
|
.set_termios = rs_set_termios,
|
|
.stop = rs_stop,
|
|
.start = rs_start,
|
|
.hangup = rs_hangup,
|
|
.break_ctl = rs_break,
|
|
.wait_until_sent = rs_wait_until_sent,
|
|
.read_proc = macserial_read_proc,
|
|
.tiocmget = rs_tiocmget,
|
|
.tiocmset = rs_tiocmset,
|
|
};
|
|
|
|
static int macserial_init(void)
|
|
{
|
|
int channel, i;
|
|
struct mac_serial *info;
|
|
|
|
/* Find out how many Z8530 SCCs we have */
|
|
if (zs_chain == 0)
|
|
probe_sccs();
|
|
|
|
serial_driver = alloc_tty_driver(zs_channels_found);
|
|
if (!serial_driver)
|
|
return -ENOMEM;
|
|
|
|
/* XXX assume it's a powerbook if we have a via-pmu
|
|
*
|
|
* This is OK for core99 machines as well.
|
|
*/
|
|
is_powerbook = find_devices("via-pmu") != 0;
|
|
|
|
/* Register the interrupt handler for each one
|
|
* We also request the OF resources here as probe_sccs()
|
|
* might be called too early for that
|
|
*/
|
|
for (i = 0; i < zs_channels_found; ++i) {
|
|
struct device_node* ch = zs_soft[i].dev_node;
|
|
if (!request_OF_resource(ch, 0, NULL)) {
|
|
printk(KERN_ERR "macserial: can't request IO resource !\n");
|
|
put_tty_driver(serial_driver);
|
|
return -ENODEV;
|
|
}
|
|
if (zs_soft[i].has_dma) {
|
|
if (!request_OF_resource(ch, ch->n_addrs - 2, " (tx dma)")) {
|
|
printk(KERN_ERR "macserial: can't request TX DMA resource !\n");
|
|
zs_soft[i].has_dma = 0;
|
|
goto no_dma;
|
|
}
|
|
if (!request_OF_resource(ch, ch->n_addrs - 1, " (rx dma)")) {
|
|
release_OF_resource(ch, ch->n_addrs - 2);
|
|
printk(KERN_ERR "macserial: can't request RX DMA resource !\n");
|
|
zs_soft[i].has_dma = 0;
|
|
goto no_dma;
|
|
}
|
|
if (request_irq(zs_soft[i].tx_dma_irq, rs_txdma_irq, 0,
|
|
"SCC-txdma", &zs_soft[i]))
|
|
printk(KERN_ERR "macserial: can't get irq %d\n",
|
|
zs_soft[i].tx_dma_irq);
|
|
disable_irq(zs_soft[i].tx_dma_irq);
|
|
if (request_irq(zs_soft[i].rx_dma_irq, rs_rxdma_irq, 0,
|
|
"SCC-rxdma", &zs_soft[i]))
|
|
printk(KERN_ERR "macserial: can't get irq %d\n",
|
|
zs_soft[i].rx_dma_irq);
|
|
disable_irq(zs_soft[i].rx_dma_irq);
|
|
}
|
|
no_dma:
|
|
if (request_irq(zs_soft[i].irq, rs_interrupt, 0,
|
|
"SCC", &zs_soft[i]))
|
|
printk(KERN_ERR "macserial: can't get irq %d\n",
|
|
zs_soft[i].irq);
|
|
disable_irq(zs_soft[i].irq);
|
|
}
|
|
|
|
show_serial_version();
|
|
|
|
/* Initialize the tty_driver structure */
|
|
/* Not all of this is exactly right for us. */
|
|
|
|
serial_driver->owner = THIS_MODULE;
|
|
serial_driver->driver_name = "macserial";
|
|
serial_driver->devfs_name = "tts/";
|
|
serial_driver->name = "ttyS";
|
|
serial_driver->major = TTY_MAJOR;
|
|
serial_driver->minor_start = 64;
|
|
serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
|
|
serial_driver->subtype = SERIAL_TYPE_NORMAL;
|
|
serial_driver->init_termios = tty_std_termios;
|
|
serial_driver->init_termios.c_cflag =
|
|
B38400 | CS8 | CREAD | HUPCL | CLOCAL;
|
|
serial_driver->flags = TTY_DRIVER_REAL_RAW;
|
|
tty_set_operations(serial_driver, &serial_ops);
|
|
|
|
if (tty_register_driver(serial_driver))
|
|
printk(KERN_ERR "Error: couldn't register serial driver\n");
|
|
|
|
for (channel = 0; channel < zs_channels_found; ++channel) {
|
|
#ifdef CONFIG_KGDB
|
|
if (zs_soft[channel].kgdb_channel) {
|
|
kgdb_interruptible(1);
|
|
continue;
|
|
}
|
|
#endif
|
|
zs_soft[channel].clk_divisor = 16;
|
|
/* -- we are not sure the SCC is powered ON at this point
|
|
zs_soft[channel].zs_baud = get_zsbaud(&zs_soft[channel]);
|
|
*/
|
|
zs_soft[channel].zs_baud = 38400;
|
|
|
|
/* If console serial line, then enable interrupts. */
|
|
if (zs_soft[channel].is_cons) {
|
|
printk(KERN_INFO "macserial: console line, enabling "
|
|
"interrupt %d\n", zs_soft[channel].irq);
|
|
panic("macserial: console not supported yet !");
|
|
write_zsreg(zs_soft[channel].zs_channel, R1,
|
|
(EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB));
|
|
write_zsreg(zs_soft[channel].zs_channel, R9,
|
|
(NV | MIE));
|
|
}
|
|
}
|
|
|
|
for (info = zs_chain, i = 0; info; info = info->zs_next, i++)
|
|
{
|
|
unsigned char* connector;
|
|
int lenp;
|
|
|
|
#ifdef CONFIG_KGDB
|
|
if (info->kgdb_channel) {
|
|
continue;
|
|
}
|
|
#endif
|
|
info->magic = SERIAL_MAGIC;
|
|
info->port = (int) info->zs_channel->control;
|
|
info->line = i;
|
|
info->tty = 0;
|
|
info->custom_divisor = 16;
|
|
info->timeout = 0;
|
|
info->close_delay = 50;
|
|
info->closing_wait = 3000;
|
|
info->x_char = 0;
|
|
info->event = 0;
|
|
info->count = 0;
|
|
info->blocked_open = 0;
|
|
INIT_WORK(&info->tqueue, do_softint, info);
|
|
spin_lock_init(&info->lock);
|
|
init_waitqueue_head(&info->open_wait);
|
|
init_waitqueue_head(&info->close_wait);
|
|
info->timeout = HZ;
|
|
printk(KERN_INFO "tty%02d at 0x%08x (irq = %d)", info->line,
|
|
info->port, info->irq);
|
|
printk(" is a Z8530 ESCC");
|
|
connector = get_property(info->dev_node, "AAPL,connector", &lenp);
|
|
if (connector)
|
|
printk(", port = %s", connector);
|
|
if (info->is_internal_modem)
|
|
printk(" (internal modem)");
|
|
if (info->is_irda)
|
|
printk(" (IrDA)");
|
|
printk("\n");
|
|
}
|
|
tmp_buf = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void macserial_cleanup(void)
|
|
{
|
|
int i;
|
|
unsigned long flags;
|
|
struct mac_serial *info;
|
|
|
|
for (info = zs_chain, i = 0; info; info = info->zs_next, i++)
|
|
set_scc_power(info, 0);
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
for (i = 0; i < zs_channels_found; ++i) {
|
|
free_irq(zs_soft[i].irq, &zs_soft[i]);
|
|
if (zs_soft[i].has_dma) {
|
|
free_irq(zs_soft[i].tx_dma_irq, &zs_soft[i]);
|
|
free_irq(zs_soft[i].rx_dma_irq, &zs_soft[i]);
|
|
}
|
|
release_OF_resource(zs_soft[i].dev_node, 0);
|
|
if (zs_soft[i].has_dma) {
|
|
struct device_node* ch = zs_soft[i].dev_node;
|
|
release_OF_resource(ch, ch->n_addrs - 2);
|
|
release_OF_resource(ch, ch->n_addrs - 1);
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
tty_unregister_driver(serial_driver);
|
|
put_tty_driver(serial_driver);
|
|
|
|
if (tmp_buf) {
|
|
free_page((unsigned long) tmp_buf);
|
|
tmp_buf = 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PMAC_PBOOK
|
|
if (zs_channels_found)
|
|
pmu_unregister_sleep_notifier(&serial_sleep_notifier);
|
|
#endif /* CONFIG_PMAC_PBOOK */
|
|
}
|
|
|
|
module_init(macserial_init);
|
|
module_exit(macserial_cleanup);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
#if 0
|
|
/*
|
|
* register_serial and unregister_serial allows for serial ports to be
|
|
* configured at run-time, to support PCMCIA modems.
|
|
*/
|
|
/* PowerMac: Unused at this time, just here to make things link. */
|
|
int register_serial(struct serial_struct *req)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
void unregister_serial(int line)
|
|
{
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* Serial console driver
|
|
* ------------------------------------------------------------
|
|
*/
|
|
#ifdef CONFIG_SERIAL_CONSOLE
|
|
|
|
/*
|
|
* Print a string to the serial port trying not to disturb
|
|
* any possible real use of the port...
|
|
*/
|
|
static void serial_console_write(struct console *co, const char *s,
|
|
unsigned count)
|
|
{
|
|
struct mac_serial *info = zs_soft + co->index;
|
|
int i;
|
|
|
|
/* Turn of interrupts and enable the transmitter. */
|
|
write_zsreg(info->zs_channel, R1, info->curregs[1] & ~TxINT_ENAB);
|
|
write_zsreg(info->zs_channel, R5, info->curregs[5] | TxENAB | RTS | DTR);
|
|
|
|
for (i=0; i<count; i++) {
|
|
/* Wait for the transmit buffer to empty. */
|
|
while ((read_zsreg(info->zs_channel, 0) & Tx_BUF_EMP) == 0) {
|
|
eieio();
|
|
}
|
|
|
|
write_zsdata(info->zs_channel, s[i]);
|
|
if (s[i] == 10) {
|
|
while ((read_zsreg(info->zs_channel, 0) & Tx_BUF_EMP)
|
|
== 0)
|
|
eieio();
|
|
|
|
write_zsdata(info->zs_channel, 13);
|
|
}
|
|
}
|
|
|
|
/* Restore the values in the registers. */
|
|
write_zsreg(info->zs_channel, R1, info->curregs[1]);
|
|
/* Don't disable the transmitter. */
|
|
}
|
|
|
|
static struct tty_driver *serial_driver;
|
|
|
|
static struct tty_driver *serial_console_device(struct console *c, int *index)
|
|
{
|
|
*index = c->index;
|
|
return serial_driver;
|
|
}
|
|
|
|
/*
|
|
* Setup initial baud/bits/parity. We do two things here:
|
|
* - construct a cflag setting for the first rs_open()
|
|
* - initialize the serial port
|
|
* Return non-zero if we didn't find a serial port.
|
|
*/
|
|
static int __init serial_console_setup(struct console *co, char *options)
|
|
{
|
|
struct mac_serial *info;
|
|
int baud = 38400;
|
|
int bits = 8;
|
|
int parity = 'n';
|
|
int cflag = CREAD | HUPCL | CLOCAL;
|
|
int brg;
|
|
char *s;
|
|
long flags;
|
|
|
|
/* Find out how many Z8530 SCCs we have */
|
|
if (zs_chain == 0)
|
|
probe_sccs();
|
|
|
|
if (zs_chain == 0)
|
|
return -1;
|
|
|
|
/* Do we have the device asked for? */
|
|
if (co->index >= zs_channels_found)
|
|
return -1;
|
|
info = zs_soft + co->index;
|
|
|
|
set_scc_power(info, 1);
|
|
|
|
/* Reset the channel */
|
|
write_zsreg(info->zs_channel, R9, CHRA);
|
|
|
|
if (options) {
|
|
baud = simple_strtoul(options, NULL, 10);
|
|
s = options;
|
|
while(*s >= '0' && *s <= '9')
|
|
s++;
|
|
if (*s)
|
|
parity = *s++;
|
|
if (*s)
|
|
bits = *s - '0';
|
|
}
|
|
|
|
/*
|
|
* Now construct a cflag setting.
|
|
*/
|
|
switch(baud) {
|
|
case 1200:
|
|
cflag |= B1200;
|
|
break;
|
|
case 2400:
|
|
cflag |= B2400;
|
|
break;
|
|
case 4800:
|
|
cflag |= B4800;
|
|
break;
|
|
case 9600:
|
|
cflag |= B9600;
|
|
break;
|
|
case 19200:
|
|
cflag |= B19200;
|
|
break;
|
|
case 57600:
|
|
cflag |= B57600;
|
|
break;
|
|
case 115200:
|
|
cflag |= B115200;
|
|
break;
|
|
case 38400:
|
|
default:
|
|
cflag |= B38400;
|
|
break;
|
|
}
|
|
switch(bits) {
|
|
case 7:
|
|
cflag |= CS7;
|
|
break;
|
|
default:
|
|
case 8:
|
|
cflag |= CS8;
|
|
break;
|
|
}
|
|
switch(parity) {
|
|
case 'o': case 'O':
|
|
cflag |= PARENB | PARODD;
|
|
break;
|
|
case 'e': case 'E':
|
|
cflag |= PARENB;
|
|
break;
|
|
}
|
|
co->cflag = cflag;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
memset(info->curregs, 0, sizeof(info->curregs));
|
|
|
|
info->zs_baud = baud;
|
|
info->clk_divisor = 16;
|
|
switch (info->zs_baud) {
|
|
case ZS_CLOCK/16: /* 230400 */
|
|
info->curregs[4] = X16CLK;
|
|
info->curregs[11] = 0;
|
|
break;
|
|
case ZS_CLOCK/32: /* 115200 */
|
|
info->curregs[4] = X32CLK;
|
|
info->curregs[11] = 0;
|
|
break;
|
|
default:
|
|
info->curregs[4] = X16CLK;
|
|
info->curregs[11] = TCBR | RCBR;
|
|
brg = BPS_TO_BRG(info->zs_baud, ZS_CLOCK/info->clk_divisor);
|
|
info->curregs[12] = (brg & 255);
|
|
info->curregs[13] = ((brg >> 8) & 255);
|
|
info->curregs[14] = BRENABL;
|
|
}
|
|
|
|
/* byte size and parity */
|
|
info->curregs[3] &= ~RxNBITS_MASK;
|
|
info->curregs[5] &= ~TxNBITS_MASK;
|
|
switch (cflag & CSIZE) {
|
|
case CS5:
|
|
info->curregs[3] |= Rx5;
|
|
info->curregs[5] |= Tx5;
|
|
break;
|
|
case CS6:
|
|
info->curregs[3] |= Rx6;
|
|
info->curregs[5] |= Tx6;
|
|
break;
|
|
case CS7:
|
|
info->curregs[3] |= Rx7;
|
|
info->curregs[5] |= Tx7;
|
|
break;
|
|
case CS8:
|
|
default: /* defaults to 8 bits */
|
|
info->curregs[3] |= Rx8;
|
|
info->curregs[5] |= Tx8;
|
|
break;
|
|
}
|
|
info->curregs[5] |= TxENAB | RTS | DTR;
|
|
info->pendregs[3] = info->curregs[3];
|
|
info->pendregs[5] = info->curregs[5];
|
|
|
|
info->curregs[4] &= ~(SB_MASK | PAR_ENA | PAR_EVEN);
|
|
if (cflag & CSTOPB) {
|
|
info->curregs[4] |= SB2;
|
|
} else {
|
|
info->curregs[4] |= SB1;
|
|
}
|
|
if (cflag & PARENB) {
|
|
info->curregs[4] |= PAR_ENA;
|
|
if (!(cflag & PARODD)) {
|
|
info->curregs[4] |= PAR_EVEN;
|
|
}
|
|
}
|
|
info->pendregs[4] = info->curregs[4];
|
|
|
|
if (!(cflag & CLOCAL)) {
|
|
if (!(info->curregs[15] & DCDIE))
|
|
info->read_reg_zero = read_zsreg(info->zs_channel, 0);
|
|
info->curregs[15] |= DCDIE;
|
|
} else
|
|
info->curregs[15] &= ~DCDIE;
|
|
if (cflag & CRTSCTS) {
|
|
info->curregs[15] |= CTSIE;
|
|
if ((read_zsreg(info->zs_channel, 0) & CTS) != 0)
|
|
info->tx_stopped = 1;
|
|
} else {
|
|
info->curregs[15] &= ~CTSIE;
|
|
info->tx_stopped = 0;
|
|
}
|
|
info->pendregs[15] = info->curregs[15];
|
|
|
|
/* Load up the new values */
|
|
load_zsregs(info->zs_channel, info->curregs);
|
|
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct console sercons = {
|
|
.name = "ttyS",
|
|
.write = serial_console_write,
|
|
.device = serial_console_device,
|
|
.setup = serial_console_setup,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
};
|
|
|
|
/*
|
|
* Register console.
|
|
*/
|
|
static void __init mac_scc_console_init(void)
|
|
{
|
|
register_console(&sercons);
|
|
}
|
|
console_initcall(mac_scc_console_init);
|
|
|
|
#endif /* ifdef CONFIG_SERIAL_CONSOLE */
|
|
|
|
#ifdef CONFIG_KGDB
|
|
/* These are for receiving and sending characters under the kgdb
|
|
* source level kernel debugger.
|
|
*/
|
|
void putDebugChar(char kgdb_char)
|
|
{
|
|
struct mac_zschannel *chan = zs_kgdbchan;
|
|
while ((read_zsreg(chan, 0) & Tx_BUF_EMP) == 0)
|
|
udelay(5);
|
|
write_zsdata(chan, kgdb_char);
|
|
}
|
|
|
|
char getDebugChar(void)
|
|
{
|
|
struct mac_zschannel *chan = zs_kgdbchan;
|
|
while((read_zsreg(chan, 0) & Rx_CH_AV) == 0)
|
|
eieio(); /*barrier();*/
|
|
return read_zsdata(chan);
|
|
}
|
|
|
|
void kgdb_interruptible(int yes)
|
|
{
|
|
struct mac_zschannel *chan = zs_kgdbchan;
|
|
int one, nine;
|
|
nine = read_zsreg(chan, 9);
|
|
if (yes == 1) {
|
|
one = EXT_INT_ENAB|INT_ALL_Rx;
|
|
nine |= MIE;
|
|
printk("turning serial ints on\n");
|
|
} else {
|
|
one = RxINT_DISAB;
|
|
nine &= ~MIE;
|
|
printk("turning serial ints off\n");
|
|
}
|
|
write_zsreg(chan, 1, one);
|
|
write_zsreg(chan, 9, nine);
|
|
}
|
|
|
|
/* This sets up the serial port we're using, and turns on
|
|
* interrupts for that channel, so kgdb is usable once we're done.
|
|
*/
|
|
static inline void kgdb_chaninit(struct mac_zschannel *ms, int intson, int bps)
|
|
{
|
|
int brg;
|
|
int i, x;
|
|
volatile char *sccc = ms->control;
|
|
brg = BPS_TO_BRG(bps, ZS_CLOCK/16);
|
|
printk("setting bps on kgdb line to %d [brg=%x]\n", bps, brg);
|
|
for (i = 20000; i != 0; --i) {
|
|
x = *sccc; eieio();
|
|
}
|
|
for (i = 0; i < sizeof(scc_inittab); ++i) {
|
|
write_zsreg(ms, scc_inittab[i], scc_inittab[i+1]);
|
|
i++;
|
|
}
|
|
}
|
|
|
|
/* This is called at boot time to prime the kgdb serial debugging
|
|
* serial line. The 'tty_num' argument is 0 for /dev/ttya and 1
|
|
* for /dev/ttyb which is determined in setup_arch() from the
|
|
* boot command line flags.
|
|
* XXX at the moment probably only channel A will work
|
|
*/
|
|
void __init zs_kgdb_hook(int tty_num)
|
|
{
|
|
/* Find out how many Z8530 SCCs we have */
|
|
if (zs_chain == 0)
|
|
probe_sccs();
|
|
|
|
set_scc_power(&zs_soft[tty_num], 1);
|
|
|
|
zs_kgdbchan = zs_soft[tty_num].zs_channel;
|
|
zs_soft[tty_num].change_needed = 0;
|
|
zs_soft[tty_num].clk_divisor = 16;
|
|
zs_soft[tty_num].zs_baud = 38400;
|
|
zs_soft[tty_num].kgdb_channel = 1; /* This runs kgdb */
|
|
|
|
/* Turn on transmitter/receiver at 8-bits/char */
|
|
kgdb_chaninit(zs_soft[tty_num].zs_channel, 1, 38400);
|
|
printk("KGDB: on channel %d initialized\n", tty_num);
|
|
set_debug_traps(); /* init stub */
|
|
}
|
|
#endif /* ifdef CONFIG_KGDB */
|
|
|
|
#ifdef CONFIG_PMAC_PBOOK
|
|
/*
|
|
* notify clients before sleep and reset bus afterwards
|
|
*/
|
|
int
|
|
serial_notify_sleep(struct pmu_sleep_notifier *self, int when)
|
|
{
|
|
int i;
|
|
|
|
switch (when) {
|
|
case PBOOK_SLEEP_REQUEST:
|
|
case PBOOK_SLEEP_REJECT:
|
|
break;
|
|
|
|
case PBOOK_SLEEP_NOW:
|
|
for (i=0; i<zs_channels_found; i++) {
|
|
struct mac_serial *info = &zs_soft[i];
|
|
if (info->flags & ZILOG_INITIALIZED) {
|
|
shutdown(info);
|
|
info->flags |= ZILOG_SLEEPING;
|
|
}
|
|
}
|
|
break;
|
|
case PBOOK_WAKE:
|
|
for (i=0; i<zs_channels_found; i++) {
|
|
struct mac_serial *info = &zs_soft[i];
|
|
if (info->flags & ZILOG_SLEEPING) {
|
|
info->flags &= ~ZILOG_SLEEPING;
|
|
startup(info);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
return PBOOK_SLEEP_OK;
|
|
}
|
|
#endif /* CONFIG_PMAC_PBOOK */
|