![David Howells](/assets/img/avatar_default.png)
Disintegrate asm/system.h for MIPS. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Ralf Baechle <ralf@linux-mips.org> cc: linux-mips@linux-mips.org
563 lines
12 KiB
C
563 lines
12 KiB
C
/*
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* Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
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* Copyright (C) 2005, 06 Ralf Baechle (ralf@linux-mips.org)
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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*/
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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#include <linux/list.h>
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#include <linux/vmalloc.h>
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#include <linux/elf.h>
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#include <linux/seq_file.h>
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#include <linux/syscalls.h>
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#include <linux/moduleloader.h>
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#include <linux/interrupt.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <asm/mipsmtregs.h>
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#include <asm/mips_mt.h>
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#include <asm/cacheflush.h>
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#include <linux/atomic.h>
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#include <asm/cpu.h>
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#include <asm/processor.h>
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#include <asm/vpe.h>
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#include <asm/rtlx.h>
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static struct rtlx_info *rtlx;
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static int major;
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static char module_name[] = "rtlx";
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static struct chan_waitqueues {
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wait_queue_head_t rt_queue;
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wait_queue_head_t lx_queue;
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atomic_t in_open;
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struct mutex mutex;
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} channel_wqs[RTLX_CHANNELS];
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static struct vpe_notifications notify;
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static int sp_stopping;
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extern void *vpe_get_shared(int index);
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static void rtlx_dispatch(void)
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{
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do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ);
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}
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/* Interrupt handler may be called before rtlx_init has otherwise had
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a chance to run.
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*/
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static irqreturn_t rtlx_interrupt(int irq, void *dev_id)
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{
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unsigned int vpeflags;
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unsigned long flags;
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int i;
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/* Ought not to be strictly necessary for SMTC builds */
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local_irq_save(flags);
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vpeflags = dvpe();
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set_c0_status(0x100 << MIPS_CPU_RTLX_IRQ);
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irq_enable_hazard();
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evpe(vpeflags);
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local_irq_restore(flags);
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for (i = 0; i < RTLX_CHANNELS; i++) {
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wake_up(&channel_wqs[i].lx_queue);
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wake_up(&channel_wqs[i].rt_queue);
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}
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return IRQ_HANDLED;
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}
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static void __used dump_rtlx(void)
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{
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int i;
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printk("id 0x%lx state %d\n", rtlx->id, rtlx->state);
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for (i = 0; i < RTLX_CHANNELS; i++) {
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struct rtlx_channel *chan = &rtlx->channel[i];
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printk(" rt_state %d lx_state %d buffer_size %d\n",
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chan->rt_state, chan->lx_state, chan->buffer_size);
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printk(" rt_read %d rt_write %d\n",
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chan->rt_read, chan->rt_write);
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printk(" lx_read %d lx_write %d\n",
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chan->lx_read, chan->lx_write);
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printk(" rt_buffer <%s>\n", chan->rt_buffer);
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printk(" lx_buffer <%s>\n", chan->lx_buffer);
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}
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}
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/* call when we have the address of the shared structure from the SP side. */
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static int rtlx_init(struct rtlx_info *rtlxi)
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{
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if (rtlxi->id != RTLX_ID) {
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printk(KERN_ERR "no valid RTLX id at 0x%p 0x%lx\n",
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rtlxi, rtlxi->id);
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return -ENOEXEC;
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}
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rtlx = rtlxi;
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return 0;
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}
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/* notifications */
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static void starting(int vpe)
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{
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int i;
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sp_stopping = 0;
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/* force a reload of rtlx */
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rtlx=NULL;
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/* wake up any sleeping rtlx_open's */
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for (i = 0; i < RTLX_CHANNELS; i++)
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wake_up_interruptible(&channel_wqs[i].lx_queue);
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}
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static void stopping(int vpe)
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{
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int i;
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sp_stopping = 1;
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for (i = 0; i < RTLX_CHANNELS; i++)
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wake_up_interruptible(&channel_wqs[i].lx_queue);
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}
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int rtlx_open(int index, int can_sleep)
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{
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struct rtlx_info **p;
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struct rtlx_channel *chan;
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enum rtlx_state state;
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int ret = 0;
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if (index >= RTLX_CHANNELS) {
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printk(KERN_DEBUG "rtlx_open index out of range\n");
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return -ENOSYS;
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}
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if (atomic_inc_return(&channel_wqs[index].in_open) > 1) {
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printk(KERN_DEBUG "rtlx_open channel %d already opened\n",
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index);
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ret = -EBUSY;
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goto out_fail;
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}
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if (rtlx == NULL) {
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if( (p = vpe_get_shared(tclimit)) == NULL) {
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if (can_sleep) {
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__wait_event_interruptible(channel_wqs[index].lx_queue,
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(p = vpe_get_shared(tclimit)), ret);
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if (ret)
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goto out_fail;
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} else {
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printk(KERN_DEBUG "No SP program loaded, and device "
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"opened with O_NONBLOCK\n");
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ret = -ENOSYS;
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goto out_fail;
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}
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}
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smp_rmb();
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if (*p == NULL) {
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if (can_sleep) {
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DEFINE_WAIT(wait);
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for (;;) {
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prepare_to_wait(
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&channel_wqs[index].lx_queue,
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&wait, TASK_INTERRUPTIBLE);
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smp_rmb();
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if (*p != NULL)
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break;
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if (!signal_pending(current)) {
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schedule();
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continue;
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}
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ret = -ERESTARTSYS;
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goto out_fail;
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}
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finish_wait(&channel_wqs[index].lx_queue, &wait);
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} else {
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pr_err(" *vpe_get_shared is NULL. "
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"Has an SP program been loaded?\n");
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ret = -ENOSYS;
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goto out_fail;
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}
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}
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if ((unsigned int)*p < KSEG0) {
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printk(KERN_WARNING "vpe_get_shared returned an "
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"invalid pointer maybe an error code %d\n",
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(int)*p);
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ret = -ENOSYS;
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goto out_fail;
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}
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if ((ret = rtlx_init(*p)) < 0)
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goto out_ret;
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}
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chan = &rtlx->channel[index];
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state = xchg(&chan->lx_state, RTLX_STATE_OPENED);
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if (state == RTLX_STATE_OPENED) {
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ret = -EBUSY;
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goto out_fail;
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}
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out_fail:
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smp_mb();
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atomic_dec(&channel_wqs[index].in_open);
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smp_mb();
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out_ret:
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return ret;
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}
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int rtlx_release(int index)
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{
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if (rtlx == NULL) {
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pr_err("rtlx_release() with null rtlx\n");
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return 0;
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}
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rtlx->channel[index].lx_state = RTLX_STATE_UNUSED;
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return 0;
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}
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unsigned int rtlx_read_poll(int index, int can_sleep)
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{
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struct rtlx_channel *chan;
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if (rtlx == NULL)
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return 0;
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chan = &rtlx->channel[index];
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/* data available to read? */
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if (chan->lx_read == chan->lx_write) {
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if (can_sleep) {
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int ret = 0;
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__wait_event_interruptible(channel_wqs[index].lx_queue,
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(chan->lx_read != chan->lx_write) ||
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sp_stopping, ret);
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if (ret)
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return ret;
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if (sp_stopping)
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return 0;
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} else
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return 0;
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}
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return (chan->lx_write + chan->buffer_size - chan->lx_read)
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% chan->buffer_size;
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}
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static inline int write_spacefree(int read, int write, int size)
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{
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if (read == write) {
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/*
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* Never fill the buffer completely, so indexes are always
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* equal if empty and only empty, or !equal if data available
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*/
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return size - 1;
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}
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return ((read + size - write) % size) - 1;
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}
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unsigned int rtlx_write_poll(int index)
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{
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struct rtlx_channel *chan = &rtlx->channel[index];
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return write_spacefree(chan->rt_read, chan->rt_write,
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chan->buffer_size);
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}
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ssize_t rtlx_read(int index, void __user *buff, size_t count)
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{
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size_t lx_write, fl = 0L;
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struct rtlx_channel *lx;
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unsigned long failed;
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if (rtlx == NULL)
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return -ENOSYS;
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lx = &rtlx->channel[index];
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mutex_lock(&channel_wqs[index].mutex);
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smp_rmb();
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lx_write = lx->lx_write;
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/* find out how much in total */
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count = min(count,
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(size_t)(lx_write + lx->buffer_size - lx->lx_read)
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% lx->buffer_size);
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/* then how much from the read pointer onwards */
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fl = min(count, (size_t)lx->buffer_size - lx->lx_read);
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failed = copy_to_user(buff, lx->lx_buffer + lx->lx_read, fl);
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if (failed)
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goto out;
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/* and if there is anything left at the beginning of the buffer */
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if (count - fl)
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failed = copy_to_user(buff + fl, lx->lx_buffer, count - fl);
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out:
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count -= failed;
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smp_wmb();
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lx->lx_read = (lx->lx_read + count) % lx->buffer_size;
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smp_wmb();
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mutex_unlock(&channel_wqs[index].mutex);
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return count;
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}
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ssize_t rtlx_write(int index, const void __user *buffer, size_t count)
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{
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struct rtlx_channel *rt;
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unsigned long failed;
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size_t rt_read;
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size_t fl;
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if (rtlx == NULL)
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return(-ENOSYS);
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rt = &rtlx->channel[index];
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mutex_lock(&channel_wqs[index].mutex);
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smp_rmb();
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rt_read = rt->rt_read;
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/* total number of bytes to copy */
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count = min(count, (size_t)write_spacefree(rt_read, rt->rt_write,
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rt->buffer_size));
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/* first bit from write pointer to the end of the buffer, or count */
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fl = min(count, (size_t) rt->buffer_size - rt->rt_write);
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failed = copy_from_user(rt->rt_buffer + rt->rt_write, buffer, fl);
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if (failed)
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goto out;
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/* if there's any left copy to the beginning of the buffer */
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if (count - fl) {
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failed = copy_from_user(rt->rt_buffer, buffer + fl, count - fl);
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}
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out:
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count -= failed;
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smp_wmb();
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rt->rt_write = (rt->rt_write + count) % rt->buffer_size;
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smp_wmb();
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mutex_unlock(&channel_wqs[index].mutex);
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return count;
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}
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static int file_open(struct inode *inode, struct file *filp)
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{
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return rtlx_open(iminor(inode), (filp->f_flags & O_NONBLOCK) ? 0 : 1);
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}
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static int file_release(struct inode *inode, struct file *filp)
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{
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return rtlx_release(iminor(inode));
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}
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static unsigned int file_poll(struct file *file, poll_table * wait)
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{
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int minor;
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unsigned int mask = 0;
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minor = iminor(file->f_path.dentry->d_inode);
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poll_wait(file, &channel_wqs[minor].rt_queue, wait);
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poll_wait(file, &channel_wqs[minor].lx_queue, wait);
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if (rtlx == NULL)
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return 0;
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/* data available to read? */
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if (rtlx_read_poll(minor, 0))
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mask |= POLLIN | POLLRDNORM;
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/* space to write */
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if (rtlx_write_poll(minor))
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mask |= POLLOUT | POLLWRNORM;
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return mask;
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}
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static ssize_t file_read(struct file *file, char __user * buffer, size_t count,
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loff_t * ppos)
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{
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int minor = iminor(file->f_path.dentry->d_inode);
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/* data available? */
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if (!rtlx_read_poll(minor, (file->f_flags & O_NONBLOCK) ? 0 : 1)) {
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return 0; // -EAGAIN makes cat whinge
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}
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return rtlx_read(minor, buffer, count);
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}
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static ssize_t file_write(struct file *file, const char __user * buffer,
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size_t count, loff_t * ppos)
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{
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int minor;
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struct rtlx_channel *rt;
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minor = iminor(file->f_path.dentry->d_inode);
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rt = &rtlx->channel[minor];
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/* any space left... */
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if (!rtlx_write_poll(minor)) {
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int ret = 0;
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if (file->f_flags & O_NONBLOCK)
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return -EAGAIN;
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__wait_event_interruptible(channel_wqs[minor].rt_queue,
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rtlx_write_poll(minor),
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ret);
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if (ret)
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return ret;
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}
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return rtlx_write(minor, buffer, count);
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}
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static const struct file_operations rtlx_fops = {
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.owner = THIS_MODULE,
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.open = file_open,
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.release = file_release,
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.write = file_write,
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.read = file_read,
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.poll = file_poll,
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.llseek = noop_llseek,
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};
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static struct irqaction rtlx_irq = {
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.handler = rtlx_interrupt,
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.name = "RTLX",
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};
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static int rtlx_irq_num = MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ;
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static char register_chrdev_failed[] __initdata =
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KERN_ERR "rtlx_module_init: unable to register device\n";
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static int __init rtlx_module_init(void)
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{
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struct device *dev;
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int i, err;
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if (!cpu_has_mipsmt) {
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printk("VPE loader: not a MIPS MT capable processor\n");
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return -ENODEV;
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}
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if (tclimit == 0) {
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printk(KERN_WARNING "No TCs reserved for AP/SP, not "
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"initializing RTLX.\nPass maxtcs=<n> argument as kernel "
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"argument\n");
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return -ENODEV;
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}
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major = register_chrdev(0, module_name, &rtlx_fops);
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if (major < 0) {
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printk(register_chrdev_failed);
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return major;
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}
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/* initialise the wait queues */
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for (i = 0; i < RTLX_CHANNELS; i++) {
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init_waitqueue_head(&channel_wqs[i].rt_queue);
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init_waitqueue_head(&channel_wqs[i].lx_queue);
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atomic_set(&channel_wqs[i].in_open, 0);
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mutex_init(&channel_wqs[i].mutex);
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dev = device_create(mt_class, NULL, MKDEV(major, i), NULL,
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"%s%d", module_name, i);
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if (IS_ERR(dev)) {
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err = PTR_ERR(dev);
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goto out_chrdev;
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}
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}
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/* set up notifiers */
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notify.start = starting;
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notify.stop = stopping;
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vpe_notify(tclimit, ¬ify);
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if (cpu_has_vint)
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set_vi_handler(MIPS_CPU_RTLX_IRQ, rtlx_dispatch);
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else {
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pr_err("APRP RTLX init on non-vectored-interrupt processor\n");
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err = -ENODEV;
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goto out_chrdev;
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}
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rtlx_irq.dev_id = rtlx;
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setup_irq(rtlx_irq_num, &rtlx_irq);
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return 0;
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out_chrdev:
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for (i = 0; i < RTLX_CHANNELS; i++)
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device_destroy(mt_class, MKDEV(major, i));
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return err;
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}
|
|
|
|
static void __exit rtlx_module_exit(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < RTLX_CHANNELS; i++)
|
|
device_destroy(mt_class, MKDEV(major, i));
|
|
|
|
unregister_chrdev(major, module_name);
|
|
}
|
|
|
|
module_init(rtlx_module_init);
|
|
module_exit(rtlx_module_exit);
|
|
|
|
MODULE_DESCRIPTION("MIPS RTLX");
|
|
MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
|
|
MODULE_LICENSE("GPL");
|