![Harvey Harrison](/assets/img/avatar_default.png)
__FUNCTION__ is gcc-specific, use __func__ Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
681 lines
16 KiB
C
681 lines
16 KiB
C
/*
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* uartlite.c: Serial driver for Xilinx uartlite serial controller
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*
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* Copyright (C) 2006 Peter Korsgaard <jacmet@sunsite.dk>
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* Copyright (C) 2007 Secret Lab Technologies Ltd.
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/console.h>
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#include <linux/serial.h>
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#include <linux/serial_core.h>
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#include <linux/tty.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <asm/io.h>
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#if defined(CONFIG_OF)
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_platform.h>
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/* Match table for of_platform binding */
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static struct of_device_id ulite_of_match[] __devinitdata = {
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{ .compatible = "xlnx,opb-uartlite-1.00.b", },
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{ .compatible = "xlnx,xps-uartlite-1.00.a", },
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{}
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};
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MODULE_DEVICE_TABLE(of, ulite_of_match);
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#endif
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#define ULITE_NAME "ttyUL"
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#define ULITE_MAJOR 204
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#define ULITE_MINOR 187
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#define ULITE_NR_UARTS 4
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/* ---------------------------------------------------------------------
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* Register definitions
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*
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* For register details see datasheet:
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* http://www.xilinx.com/bvdocs/ipcenter/data_sheet/opb_uartlite.pdf
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*/
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#define ULITE_RX 0x00
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#define ULITE_TX 0x04
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#define ULITE_STATUS 0x08
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#define ULITE_CONTROL 0x0c
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#define ULITE_REGION 16
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#define ULITE_STATUS_RXVALID 0x01
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#define ULITE_STATUS_RXFULL 0x02
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#define ULITE_STATUS_TXEMPTY 0x04
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#define ULITE_STATUS_TXFULL 0x08
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#define ULITE_STATUS_IE 0x10
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#define ULITE_STATUS_OVERRUN 0x20
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#define ULITE_STATUS_FRAME 0x40
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#define ULITE_STATUS_PARITY 0x80
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#define ULITE_CONTROL_RST_TX 0x01
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#define ULITE_CONTROL_RST_RX 0x02
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#define ULITE_CONTROL_IE 0x10
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static struct uart_port ulite_ports[ULITE_NR_UARTS];
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/* ---------------------------------------------------------------------
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* Core UART driver operations
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*/
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static int ulite_receive(struct uart_port *port, int stat)
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{
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struct tty_struct *tty = port->info->tty;
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unsigned char ch = 0;
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char flag = TTY_NORMAL;
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if ((stat & (ULITE_STATUS_RXVALID | ULITE_STATUS_OVERRUN
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| ULITE_STATUS_FRAME)) == 0)
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return 0;
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/* stats */
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if (stat & ULITE_STATUS_RXVALID) {
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port->icount.rx++;
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ch = readb(port->membase + ULITE_RX);
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if (stat & ULITE_STATUS_PARITY)
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port->icount.parity++;
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}
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if (stat & ULITE_STATUS_OVERRUN)
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port->icount.overrun++;
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if (stat & ULITE_STATUS_FRAME)
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port->icount.frame++;
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/* drop byte with parity error if IGNPAR specificed */
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if (stat & port->ignore_status_mask & ULITE_STATUS_PARITY)
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stat &= ~ULITE_STATUS_RXVALID;
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stat &= port->read_status_mask;
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if (stat & ULITE_STATUS_PARITY)
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flag = TTY_PARITY;
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stat &= ~port->ignore_status_mask;
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if (stat & ULITE_STATUS_RXVALID)
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tty_insert_flip_char(tty, ch, flag);
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if (stat & ULITE_STATUS_FRAME)
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tty_insert_flip_char(tty, 0, TTY_FRAME);
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if (stat & ULITE_STATUS_OVERRUN)
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tty_insert_flip_char(tty, 0, TTY_OVERRUN);
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return 1;
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}
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static int ulite_transmit(struct uart_port *port, int stat)
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{
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struct circ_buf *xmit = &port->info->xmit;
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if (stat & ULITE_STATUS_TXFULL)
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return 0;
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if (port->x_char) {
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writeb(port->x_char, port->membase + ULITE_TX);
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port->x_char = 0;
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port->icount.tx++;
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return 1;
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}
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if (uart_circ_empty(xmit) || uart_tx_stopped(port))
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return 0;
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writeb(xmit->buf[xmit->tail], port->membase + ULITE_TX);
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xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE-1);
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port->icount.tx++;
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/* wake up */
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if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
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uart_write_wakeup(port);
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return 1;
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}
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static irqreturn_t ulite_isr(int irq, void *dev_id)
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{
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struct uart_port *port = dev_id;
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int busy;
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do {
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int stat = readb(port->membase + ULITE_STATUS);
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busy = ulite_receive(port, stat);
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busy |= ulite_transmit(port, stat);
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} while (busy);
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tty_flip_buffer_push(port->info->tty);
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return IRQ_HANDLED;
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}
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static unsigned int ulite_tx_empty(struct uart_port *port)
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{
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unsigned long flags;
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unsigned int ret;
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spin_lock_irqsave(&port->lock, flags);
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ret = readb(port->membase + ULITE_STATUS);
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spin_unlock_irqrestore(&port->lock, flags);
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return ret & ULITE_STATUS_TXEMPTY ? TIOCSER_TEMT : 0;
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}
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static unsigned int ulite_get_mctrl(struct uart_port *port)
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{
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return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
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}
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static void ulite_set_mctrl(struct uart_port *port, unsigned int mctrl)
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{
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/* N/A */
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}
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static void ulite_stop_tx(struct uart_port *port)
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{
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/* N/A */
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}
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static void ulite_start_tx(struct uart_port *port)
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{
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ulite_transmit(port, readb(port->membase + ULITE_STATUS));
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}
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static void ulite_stop_rx(struct uart_port *port)
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{
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/* don't forward any more data (like !CREAD) */
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port->ignore_status_mask = ULITE_STATUS_RXVALID | ULITE_STATUS_PARITY
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| ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN;
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}
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static void ulite_enable_ms(struct uart_port *port)
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{
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/* N/A */
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}
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static void ulite_break_ctl(struct uart_port *port, int ctl)
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{
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/* N/A */
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}
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static int ulite_startup(struct uart_port *port)
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{
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int ret;
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ret = request_irq(port->irq, ulite_isr,
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IRQF_DISABLED | IRQF_SAMPLE_RANDOM, "uartlite", port);
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if (ret)
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return ret;
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writeb(ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX,
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port->membase + ULITE_CONTROL);
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writeb(ULITE_CONTROL_IE, port->membase + ULITE_CONTROL);
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return 0;
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}
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static void ulite_shutdown(struct uart_port *port)
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{
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writeb(0, port->membase + ULITE_CONTROL);
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readb(port->membase + ULITE_CONTROL); /* dummy */
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free_irq(port->irq, port);
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}
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static void ulite_set_termios(struct uart_port *port, struct ktermios *termios,
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struct ktermios *old)
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{
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unsigned long flags;
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unsigned int baud;
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spin_lock_irqsave(&port->lock, flags);
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port->read_status_mask = ULITE_STATUS_RXVALID | ULITE_STATUS_OVERRUN
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| ULITE_STATUS_TXFULL;
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if (termios->c_iflag & INPCK)
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port->read_status_mask |=
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ULITE_STATUS_PARITY | ULITE_STATUS_FRAME;
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port->ignore_status_mask = 0;
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if (termios->c_iflag & IGNPAR)
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port->ignore_status_mask |= ULITE_STATUS_PARITY
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| ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN;
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/* ignore all characters if CREAD is not set */
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if ((termios->c_cflag & CREAD) == 0)
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port->ignore_status_mask |=
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ULITE_STATUS_RXVALID | ULITE_STATUS_PARITY
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| ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN;
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/* update timeout */
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baud = uart_get_baud_rate(port, termios, old, 0, 460800);
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uart_update_timeout(port, termios->c_cflag, baud);
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spin_unlock_irqrestore(&port->lock, flags);
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}
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static const char *ulite_type(struct uart_port *port)
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{
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return port->type == PORT_UARTLITE ? "uartlite" : NULL;
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}
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static void ulite_release_port(struct uart_port *port)
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{
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release_mem_region(port->mapbase, ULITE_REGION);
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iounmap(port->membase);
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port->membase = NULL;
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}
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static int ulite_request_port(struct uart_port *port)
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{
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pr_debug("ulite console: port=%p; port->mapbase=%x\n",
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port, port->mapbase);
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if (!request_mem_region(port->mapbase, ULITE_REGION, "uartlite")) {
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dev_err(port->dev, "Memory region busy\n");
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return -EBUSY;
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}
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port->membase = ioremap(port->mapbase, ULITE_REGION);
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if (!port->membase) {
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dev_err(port->dev, "Unable to map registers\n");
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release_mem_region(port->mapbase, ULITE_REGION);
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return -EBUSY;
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}
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return 0;
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}
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static void ulite_config_port(struct uart_port *port, int flags)
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{
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if (!ulite_request_port(port))
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port->type = PORT_UARTLITE;
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}
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static int ulite_verify_port(struct uart_port *port, struct serial_struct *ser)
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{
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/* we don't want the core code to modify any port params */
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return -EINVAL;
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}
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static struct uart_ops ulite_ops = {
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.tx_empty = ulite_tx_empty,
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.set_mctrl = ulite_set_mctrl,
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.get_mctrl = ulite_get_mctrl,
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.stop_tx = ulite_stop_tx,
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.start_tx = ulite_start_tx,
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.stop_rx = ulite_stop_rx,
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.enable_ms = ulite_enable_ms,
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.break_ctl = ulite_break_ctl,
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.startup = ulite_startup,
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.shutdown = ulite_shutdown,
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.set_termios = ulite_set_termios,
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.type = ulite_type,
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.release_port = ulite_release_port,
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.request_port = ulite_request_port,
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.config_port = ulite_config_port,
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.verify_port = ulite_verify_port
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};
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/* ---------------------------------------------------------------------
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* Console driver operations
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*/
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#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
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static void ulite_console_wait_tx(struct uart_port *port)
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{
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int i;
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u8 val;
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/* Spin waiting for TX fifo to have space available */
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for (i = 0; i < 100000; i++) {
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val = readb(port->membase + ULITE_STATUS);
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if ((val & ULITE_STATUS_TXFULL) == 0)
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break;
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cpu_relax();
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}
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}
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static void ulite_console_putchar(struct uart_port *port, int ch)
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{
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ulite_console_wait_tx(port);
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writeb(ch, port->membase + ULITE_TX);
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}
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static void ulite_console_write(struct console *co, const char *s,
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unsigned int count)
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{
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struct uart_port *port = &ulite_ports[co->index];
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unsigned long flags;
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unsigned int ier;
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int locked = 1;
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if (oops_in_progress) {
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locked = spin_trylock_irqsave(&port->lock, flags);
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} else
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spin_lock_irqsave(&port->lock, flags);
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/* save and disable interrupt */
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ier = readb(port->membase + ULITE_STATUS) & ULITE_STATUS_IE;
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writeb(0, port->membase + ULITE_CONTROL);
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uart_console_write(port, s, count, ulite_console_putchar);
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ulite_console_wait_tx(port);
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/* restore interrupt state */
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if (ier)
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writeb(ULITE_CONTROL_IE, port->membase + ULITE_CONTROL);
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if (locked)
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spin_unlock_irqrestore(&port->lock, flags);
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}
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static int __init ulite_console_setup(struct console *co, char *options)
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{
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struct uart_port *port;
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int baud = 9600;
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int bits = 8;
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int parity = 'n';
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int flow = 'n';
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if (co->index < 0 || co->index >= ULITE_NR_UARTS)
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return -EINVAL;
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port = &ulite_ports[co->index];
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/* Has the device been initialized yet? */
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if (!port->mapbase) {
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pr_debug("console on ttyUL%i not present\n", co->index);
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return -ENODEV;
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}
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/* not initialized yet? */
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if (!port->membase) {
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if (ulite_request_port(port))
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return -ENODEV;
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}
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if (options)
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uart_parse_options(options, &baud, &parity, &bits, &flow);
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return uart_set_options(port, co, baud, parity, bits, flow);
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}
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static struct uart_driver ulite_uart_driver;
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static struct console ulite_console = {
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.name = ULITE_NAME,
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.write = ulite_console_write,
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.device = uart_console_device,
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.setup = ulite_console_setup,
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.flags = CON_PRINTBUFFER,
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.index = -1, /* Specified on the cmdline (e.g. console=ttyUL0 ) */
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.data = &ulite_uart_driver,
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};
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static int __init ulite_console_init(void)
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{
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register_console(&ulite_console);
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return 0;
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}
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console_initcall(ulite_console_init);
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#endif /* CONFIG_SERIAL_UARTLITE_CONSOLE */
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static struct uart_driver ulite_uart_driver = {
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.owner = THIS_MODULE,
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.driver_name = "uartlite",
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.dev_name = ULITE_NAME,
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.major = ULITE_MAJOR,
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.minor = ULITE_MINOR,
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.nr = ULITE_NR_UARTS,
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#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
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.cons = &ulite_console,
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#endif
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};
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/* ---------------------------------------------------------------------
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* Port assignment functions (mapping devices to uart_port structures)
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*/
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/** ulite_assign: register a uartlite device with the driver
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*
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* @dev: pointer to device structure
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* @id: requested id number. Pass -1 for automatic port assignment
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* @base: base address of uartlite registers
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* @irq: irq number for uartlite
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*
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* Returns: 0 on success, <0 otherwise
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*/
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static int __devinit ulite_assign(struct device *dev, int id, u32 base, int irq)
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{
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struct uart_port *port;
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int rc;
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/* if id = -1; then scan for a free id and use that */
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if (id < 0) {
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for (id = 0; id < ULITE_NR_UARTS; id++)
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if (ulite_ports[id].mapbase == 0)
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break;
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}
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if (id < 0 || id >= ULITE_NR_UARTS) {
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dev_err(dev, "%s%i too large\n", ULITE_NAME, id);
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return -EINVAL;
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}
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if ((ulite_ports[id].mapbase) && (ulite_ports[id].mapbase != base)) {
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dev_err(dev, "cannot assign to %s%i; it is already in use\n",
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ULITE_NAME, id);
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return -EBUSY;
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}
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port = &ulite_ports[id];
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spin_lock_init(&port->lock);
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port->fifosize = 16;
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port->regshift = 2;
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port->iotype = UPIO_MEM;
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port->iobase = 1; /* mark port in use */
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port->mapbase = base;
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port->membase = NULL;
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port->ops = &ulite_ops;
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port->irq = irq;
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port->flags = UPF_BOOT_AUTOCONF;
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port->dev = dev;
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port->type = PORT_UNKNOWN;
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port->line = id;
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dev_set_drvdata(dev, port);
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/* Register the port */
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rc = uart_add_one_port(&ulite_uart_driver, port);
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if (rc) {
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dev_err(dev, "uart_add_one_port() failed; err=%i\n", rc);
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port->mapbase = 0;
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dev_set_drvdata(dev, NULL);
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return rc;
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}
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return 0;
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}
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/** ulite_release: register a uartlite device with the driver
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*
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* @dev: pointer to device structure
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*/
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static int __devexit ulite_release(struct device *dev)
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|
{
|
|
struct uart_port *port = dev_get_drvdata(dev);
|
|
int rc = 0;
|
|
|
|
if (port) {
|
|
rc = uart_remove_one_port(&ulite_uart_driver, port);
|
|
dev_set_drvdata(dev, NULL);
|
|
port->mapbase = 0;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------
|
|
* Platform bus binding
|
|
*/
|
|
|
|
static int __devinit ulite_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *res, *res2;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res)
|
|
return -ENODEV;
|
|
|
|
res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
|
if (!res2)
|
|
return -ENODEV;
|
|
|
|
return ulite_assign(&pdev->dev, pdev->id, res->start, res2->start);
|
|
}
|
|
|
|
static int __devexit ulite_remove(struct platform_device *pdev)
|
|
{
|
|
return ulite_release(&pdev->dev);
|
|
}
|
|
|
|
/* work with hotplug and coldplug */
|
|
MODULE_ALIAS("platform:uartlite");
|
|
|
|
static struct platform_driver ulite_platform_driver = {
|
|
.probe = ulite_probe,
|
|
.remove = __devexit_p(ulite_remove),
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "uartlite",
|
|
},
|
|
};
|
|
|
|
/* ---------------------------------------------------------------------
|
|
* OF bus bindings
|
|
*/
|
|
#if defined(CONFIG_OF)
|
|
static int __devinit
|
|
ulite_of_probe(struct of_device *op, const struct of_device_id *match)
|
|
{
|
|
struct resource res;
|
|
const unsigned int *id;
|
|
int irq, rc;
|
|
|
|
dev_dbg(&op->dev, "%s(%p, %p)\n", __func__, op, match);
|
|
|
|
rc = of_address_to_resource(op->node, 0, &res);
|
|
if (rc) {
|
|
dev_err(&op->dev, "invalid address\n");
|
|
return rc;
|
|
}
|
|
|
|
irq = irq_of_parse_and_map(op->node, 0);
|
|
|
|
id = of_get_property(op->node, "port-number", NULL);
|
|
|
|
return ulite_assign(&op->dev, id ? *id : -1, res.start+3, irq);
|
|
}
|
|
|
|
static int __devexit ulite_of_remove(struct of_device *op)
|
|
{
|
|
return ulite_release(&op->dev);
|
|
}
|
|
|
|
static struct of_platform_driver ulite_of_driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "uartlite",
|
|
.match_table = ulite_of_match,
|
|
.probe = ulite_of_probe,
|
|
.remove = __devexit_p(ulite_of_remove),
|
|
.driver = {
|
|
.name = "uartlite",
|
|
},
|
|
};
|
|
|
|
/* Registration helpers to keep the number of #ifdefs to a minimum */
|
|
static inline int __init ulite_of_register(void)
|
|
{
|
|
pr_debug("uartlite: calling of_register_platform_driver()\n");
|
|
return of_register_platform_driver(&ulite_of_driver);
|
|
}
|
|
|
|
static inline void __exit ulite_of_unregister(void)
|
|
{
|
|
of_unregister_platform_driver(&ulite_of_driver);
|
|
}
|
|
#else /* CONFIG_OF */
|
|
/* CONFIG_OF not enabled; do nothing helpers */
|
|
static inline int __init ulite_of_register(void) { return 0; }
|
|
static inline void __exit ulite_of_unregister(void) { }
|
|
#endif /* CONFIG_OF */
|
|
|
|
/* ---------------------------------------------------------------------
|
|
* Module setup/teardown
|
|
*/
|
|
|
|
int __init ulite_init(void)
|
|
{
|
|
int ret;
|
|
|
|
pr_debug("uartlite: calling uart_register_driver()\n");
|
|
ret = uart_register_driver(&ulite_uart_driver);
|
|
if (ret)
|
|
goto err_uart;
|
|
|
|
ret = ulite_of_register();
|
|
if (ret)
|
|
goto err_of;
|
|
|
|
pr_debug("uartlite: calling platform_driver_register()\n");
|
|
ret = platform_driver_register(&ulite_platform_driver);
|
|
if (ret)
|
|
goto err_plat;
|
|
|
|
return 0;
|
|
|
|
err_plat:
|
|
ulite_of_unregister();
|
|
err_of:
|
|
uart_unregister_driver(&ulite_uart_driver);
|
|
err_uart:
|
|
printk(KERN_ERR "registering uartlite driver failed: err=%i", ret);
|
|
return ret;
|
|
}
|
|
|
|
void __exit ulite_exit(void)
|
|
{
|
|
platform_driver_unregister(&ulite_platform_driver);
|
|
ulite_of_unregister();
|
|
uart_unregister_driver(&ulite_uart_driver);
|
|
}
|
|
|
|
module_init(ulite_init);
|
|
module_exit(ulite_exit);
|
|
|
|
MODULE_AUTHOR("Peter Korsgaard <jacmet@sunsite.dk>");
|
|
MODULE_DESCRIPTION("Xilinx uartlite serial driver");
|
|
MODULE_LICENSE("GPL");
|