2005-07-14 15:57:16 +00:00
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/*
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* Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
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2006-01-15 18:11:28 +00:00
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* Copyright (C) 2005, 06 Ralf Baechle (ralf@linux-mips.org)
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2005-07-14 15:57:16 +00:00
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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/kernel.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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2006-04-05 08:45:45 +00:00
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#include <asm/uaccess.h>
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#include <linux/slab.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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2006-01-15 18:11:28 +00:00
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#include <linux/interrupt.h>
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2005-07-14 15:57:16 +00:00
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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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2006-04-05 08:45:45 +00:00
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#include <asm/cacheflush.h>
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#include <asm/atomic.h>
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2005-07-14 15:57:16 +00:00
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#include <asm/cpu.h>
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#include <asm/processor.h>
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2006-04-05 08:45:45 +00:00
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#include <asm/system.h>
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#include <asm/vpe.h>
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2005-07-14 15:57:16 +00:00
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#include <asm/rtlx.h>
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#define RTLX_TARG_VPE 1
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2005-10-31 00:30:39 +00:00
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static struct rtlx_info *rtlx;
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2005-07-14 15:57:16 +00:00
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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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2006-04-05 08:45:45 +00:00
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int in_open;
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2005-07-14 15:57:16 +00:00
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} channel_wqs[RTLX_CHANNELS];
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2006-04-05 08:45:45 +00:00
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static struct irqaction irq;
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static int irq_num;
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static struct vpe_notifications notify;
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static int sp_stopping = 0;
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2005-07-14 15:57:16 +00:00
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extern void *vpe_get_shared(int index);
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static void rtlx_dispatch(struct pt_regs *regs)
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{
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do_IRQ(MIPSCPU_INT_BASE + MIPS_CPU_RTLX_IRQ, regs);
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}
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2006-04-05 08:45:45 +00:00
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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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2005-10-31 00:30:39 +00:00
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static irqreturn_t rtlx_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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2005-07-14 15:57:16 +00:00
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{
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int i;
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for (i = 0; i < RTLX_CHANNELS; i++) {
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2006-04-05 08:45:45 +00:00
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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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2005-07-14 15:57:16 +00:00
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}
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2005-10-31 00:30:39 +00:00
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return IRQ_HANDLED;
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2005-07-14 15:57:16 +00:00
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}
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2006-04-05 08:45:45 +00:00
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static __attribute_used__ void dump_rtlx(void)
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2005-07-14 15:57:16 +00:00
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{
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int i;
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2006-04-05 08:45:45 +00:00
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printk("id 0x%lx state %d\n", rtlx->id, rtlx->state);
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2005-07-14 15:57:16 +00:00
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for (i = 0; i < RTLX_CHANNELS; i++) {
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2006-04-05 08:45:45 +00:00
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struct rtlx_channel *chan = &rtlx->channel[i];
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2005-07-14 15:57:16 +00:00
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2006-04-05 08:45:45 +00:00
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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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2005-07-14 15:57:16 +00:00
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2006-04-05 08:45:45 +00:00
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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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2005-07-14 15:57:16 +00:00
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2006-04-05 08:45:45 +00:00
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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%x\n", rtlxi, rtlxi->id);
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return -ENOEXEC;
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}
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2005-07-14 15:57:16 +00:00
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rtlx = rtlxi;
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2005-10-31 00:30:39 +00:00
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return 0;
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2005-07-14 15:57:16 +00:00
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}
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2006-04-05 08:45:45 +00:00
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/* notifications */
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static void starting(int vpe)
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2005-07-14 15:57:16 +00:00
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{
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2006-04-05 08:45:45 +00:00
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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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int ret;
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2005-07-14 15:57:16 +00:00
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struct rtlx_channel *chan;
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2006-04-05 08:45:45 +00:00
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volatile struct rtlx_info **p;
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2005-07-14 15:57:16 +00:00
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2006-04-05 08:45:45 +00:00
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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 (channel_wqs[index].in_open) {
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printk(KERN_DEBUG "rtlx_open channel %d already opened\n", index);
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return -EBUSY;
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}
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channel_wqs[index].in_open++;
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2005-07-14 15:57:16 +00:00
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if (rtlx == NULL) {
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if( (p = vpe_get_shared(RTLX_TARG_VPE)) == NULL) {
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2006-04-05 08:45:45 +00:00
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if (can_sleep) {
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DECLARE_WAITQUEUE(wait, current);
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/* go to sleep */
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add_wait_queue(&channel_wqs[index].lx_queue, &wait);
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set_current_state(TASK_INTERRUPTIBLE);
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while ((p = vpe_get_shared(RTLX_TARG_VPE)) == NULL) {
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schedule();
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set_current_state(TASK_INTERRUPTIBLE);
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}
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set_current_state(TASK_RUNNING);
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remove_wait_queue(&channel_wqs[index].lx_queue, &wait);
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/* back running */
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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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channel_wqs[index].in_open = 0;
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return -ENOSYS;
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}
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2005-07-14 15:57:16 +00:00
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}
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if (*p == NULL) {
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2006-04-05 08:45:45 +00:00
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if (can_sleep) {
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DECLARE_WAITQUEUE(wait, current);
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/* go to sleep */
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add_wait_queue(&channel_wqs[index].lx_queue, &wait);
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set_current_state(TASK_INTERRUPTIBLE);
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while (*p == NULL) {
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schedule();
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/* reset task state to interruptable otherwise
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we'll whizz round here like a very fast loopy
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thing. schedule() appears to return with state
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set to TASK_RUNNING.
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If the loaded SP program, for whatever reason,
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doesn't set up the shared structure *p will never
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become true. So whoever connected to either /dev/rt?
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or if it was kspd, will then take up rather a lot of
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processor cycles.
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*/
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set_current_state(TASK_INTERRUPTIBLE);
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}
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set_current_state(TASK_RUNNING);
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remove_wait_queue(&channel_wqs[index].lx_queue, &wait);
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/* back running */
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}
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else {
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printk(" *vpe_get_shared is NULL. "
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"Has an SP program been loaded?\n");
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channel_wqs[index].in_open = 0;
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return -ENOSYS;
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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 invalid pointer "
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"maybe an error code %d\n", (int)*p);
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channel_wqs[index].in_open = 0;
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return -ENOSYS;
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2005-07-14 15:57:16 +00:00
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}
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2006-04-05 08:45:45 +00:00
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if ((ret = rtlx_init(*p)) < 0) {
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channel_wqs[index].in_open = 0;
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return ret;
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}
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2005-07-14 15:57:16 +00:00
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}
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2006-04-05 08:45:45 +00:00
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chan = &rtlx->channel[index];
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2005-07-14 15:57:16 +00:00
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2006-04-05 08:45:45 +00:00
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if (chan->lx_state == RTLX_STATE_OPENED) {
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channel_wqs[index].in_open = 0;
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return -EBUSY;
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}
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2005-07-14 15:57:16 +00:00
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2006-04-05 08:45:45 +00:00
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chan->lx_state = RTLX_STATE_OPENED;
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channel_wqs[index].in_open = 0;
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2005-10-31 00:30:39 +00:00
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return 0;
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2005-07-14 15:57:16 +00:00
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}
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2006-04-05 08:45:45 +00:00
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int rtlx_release(int index)
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2005-07-14 15:57:16 +00:00
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{
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2006-04-05 08:45:45 +00:00
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rtlx->channel[index].lx_state = RTLX_STATE_UNUSED;
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2005-10-31 00:30:39 +00:00
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return 0;
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2005-07-14 15:57:16 +00:00
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}
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2006-04-05 08:45:45 +00:00
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unsigned int rtlx_read_poll(int index, int can_sleep)
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2005-07-14 15:57:16 +00:00
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{
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2006-04-05 08:45:45 +00:00
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struct rtlx_channel *chan;
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2005-07-14 15:57:16 +00:00
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2006-04-05 08:45:45 +00:00
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if (rtlx == NULL)
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return 0;
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2005-07-14 15:57:16 +00:00
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2006-04-05 08:45:45 +00:00
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chan = &rtlx->channel[index];
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2005-07-14 15:57:16 +00:00
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/* data available to read? */
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2006-04-05 08:45:45 +00:00
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if (chan->lx_read == chan->lx_write) {
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if (can_sleep) {
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DECLARE_WAITQUEUE(wait, current);
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2005-07-14 15:57:16 +00:00
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2006-04-05 08:45:45 +00:00
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/* go to sleep */
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add_wait_queue(&channel_wqs[index].lx_queue, &wait);
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2005-07-14 15:57:16 +00:00
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2006-04-05 08:45:45 +00:00
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set_current_state(TASK_INTERRUPTIBLE);
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while (chan->lx_read == chan->lx_write) {
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schedule();
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set_current_state(TASK_INTERRUPTIBLE);
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if (sp_stopping) {
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set_current_state(TASK_RUNNING);
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remove_wait_queue(&channel_wqs[index].lx_queue, &wait);
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return 0;
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}
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}
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set_current_state(TASK_RUNNING);
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remove_wait_queue(&channel_wqs[index].lx_queue, &wait);
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/* back running */
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}
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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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2005-07-14 15:57:16 +00:00
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}
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2006-04-05 08:45:45 +00:00
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static inline int write_spacefree(int read, int write, int size)
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2005-07-14 15:57:16 +00:00
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{
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2006-04-05 08:45:45 +00:00
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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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2005-07-14 15:57:16 +00:00
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2006-04-05 08:45:45 +00:00
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return ((read + size - write) % size) - 1;
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}
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2005-07-14 15:57:16 +00:00
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2006-04-05 08:45:45 +00:00
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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, chan->buffer_size);
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}
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2005-07-14 15:57:16 +00:00
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2006-04-05 08:45:45 +00:00
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static inline void copy_to(void *dst, void *src, size_t count, int user)
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{
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if (user)
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copy_to_user(dst, src, count);
|
|
|
|
else
|
|
|
|
memcpy(dst, src, count);
|
|
|
|
}
|
2005-07-14 15:57:16 +00:00
|
|
|
|
2006-04-05 08:45:45 +00:00
|
|
|
static inline void copy_from(void *dst, void *src, size_t count, int user)
|
|
|
|
{
|
|
|
|
if (user)
|
|
|
|
copy_from_user(dst, src, count);
|
|
|
|
else
|
|
|
|
memcpy(dst, src, count);
|
|
|
|
}
|
2005-07-14 15:57:16 +00:00
|
|
|
|
2006-04-05 08:45:45 +00:00
|
|
|
ssize_t rtlx_read(int index, void *buff, size_t count, int user)
|
|
|
|
{
|
|
|
|
size_t fl = 0L;
|
|
|
|
struct rtlx_channel *lx;
|
2005-07-14 15:57:16 +00:00
|
|
|
|
2006-04-05 08:45:45 +00:00
|
|
|
if (rtlx == NULL)
|
|
|
|
return -ENOSYS;
|
|
|
|
|
|
|
|
lx = &rtlx->channel[index];
|
2005-07-14 15:57:16 +00:00
|
|
|
|
|
|
|
/* find out how much in total */
|
2005-10-31 00:30:39 +00:00
|
|
|
count = min(count,
|
2006-04-05 08:45:45 +00:00
|
|
|
(size_t)(lx->lx_write + lx->buffer_size - lx->lx_read)
|
|
|
|
% lx->buffer_size);
|
2005-07-14 15:57:16 +00:00
|
|
|
|
|
|
|
/* then how much from the read pointer onwards */
|
2006-04-05 08:45:45 +00:00
|
|
|
fl = min( count, (size_t)lx->buffer_size - lx->lx_read);
|
2005-07-14 15:57:16 +00:00
|
|
|
|
2006-04-05 08:45:45 +00:00
|
|
|
copy_to(buff, &lx->lx_buffer[lx->lx_read], fl, user);
|
2005-07-14 15:57:16 +00:00
|
|
|
|
|
|
|
/* and if there is anything left at the beginning of the buffer */
|
2006-04-05 08:45:45 +00:00
|
|
|
if ( count - fl )
|
|
|
|
copy_to (buff + fl, lx->lx_buffer, count - fl, user);
|
2005-07-14 15:57:16 +00:00
|
|
|
|
|
|
|
/* update the index */
|
|
|
|
lx->lx_read += count;
|
|
|
|
lx->lx_read %= lx->buffer_size;
|
|
|
|
|
2005-10-31 00:30:39 +00:00
|
|
|
return count;
|
2005-07-14 15:57:16 +00:00
|
|
|
}
|
|
|
|
|
2006-04-05 08:45:45 +00:00
|
|
|
ssize_t rtlx_write(int index, void *buffer, size_t count, int user)
|
|
|
|
{
|
|
|
|
struct rtlx_channel *rt;
|
|
|
|
size_t fl;
|
|
|
|
|
|
|
|
if (rtlx == NULL)
|
|
|
|
return(-ENOSYS);
|
|
|
|
|
|
|
|
rt = &rtlx->channel[index];
|
|
|
|
|
|
|
|
/* total number of bytes to copy */
|
|
|
|
count = min(count,
|
|
|
|
(size_t)write_spacefree(rt->rt_read, rt->rt_write,
|
|
|
|
rt->buffer_size));
|
|
|
|
|
|
|
|
/* first bit from write pointer to the end of the buffer, or count */
|
|
|
|
fl = min(count, (size_t) rt->buffer_size - rt->rt_write);
|
|
|
|
|
|
|
|
copy_from (&rt->rt_buffer[rt->rt_write], buffer, fl, user);
|
|
|
|
|
|
|
|
/* if there's any left copy to the beginning of the buffer */
|
|
|
|
if( count - fl )
|
|
|
|
copy_from (rt->rt_buffer, buffer + fl, count - fl, user);
|
|
|
|
|
|
|
|
rt->rt_write += count;
|
|
|
|
rt->rt_write %= rt->buffer_size;
|
|
|
|
|
|
|
|
return(count);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int file_open(struct inode *inode, struct file *filp)
|
|
|
|
{
|
|
|
|
int minor = MINOR(inode->i_rdev);
|
|
|
|
|
|
|
|
return rtlx_open(minor, (filp->f_flags & O_NONBLOCK) ? 0 : 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int file_release(struct inode *inode, struct file *filp)
|
|
|
|
{
|
|
|
|
int minor;
|
|
|
|
minor = MINOR(inode->i_rdev);
|
|
|
|
|
|
|
|
return rtlx_release(minor);
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int file_poll(struct file *file, poll_table * wait)
|
|
|
|
{
|
|
|
|
int minor;
|
|
|
|
unsigned int mask = 0;
|
|
|
|
|
|
|
|
minor = MINOR(file->f_dentry->d_inode->i_rdev);
|
|
|
|
|
|
|
|
poll_wait(file, &channel_wqs[minor].rt_queue, wait);
|
|
|
|
poll_wait(file, &channel_wqs[minor].lx_queue, wait);
|
|
|
|
|
|
|
|
if (rtlx == NULL)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
/* data available to read? */
|
|
|
|
if (rtlx_read_poll(minor, 0))
|
|
|
|
mask |= POLLIN | POLLRDNORM;
|
|
|
|
|
|
|
|
/* space to write */
|
|
|
|
if (rtlx_write_poll(minor))
|
|
|
|
mask |= POLLOUT | POLLWRNORM;
|
|
|
|
|
|
|
|
return mask;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t file_read(struct file *file, char __user * buffer, size_t count,
|
|
|
|
loff_t * ppos)
|
|
|
|
{
|
|
|
|
int minor = MINOR(file->f_dentry->d_inode->i_rdev);
|
|
|
|
|
|
|
|
/* data available? */
|
|
|
|
if (!rtlx_read_poll(minor, (file->f_flags & O_NONBLOCK) ? 0 : 1)) {
|
|
|
|
return 0; // -EAGAIN makes cat whinge
|
|
|
|
}
|
|
|
|
|
|
|
|
return rtlx_read(minor, buffer, count, 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t file_write(struct file *file, const char __user * buffer,
|
2005-07-14 15:57:16 +00:00
|
|
|
size_t count, loff_t * ppos)
|
|
|
|
{
|
|
|
|
int minor;
|
|
|
|
struct rtlx_channel *rt;
|
|
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
|
|
|
|
|
minor = MINOR(file->f_dentry->d_inode->i_rdev);
|
|
|
|
rt = &rtlx->channel[minor];
|
|
|
|
|
|
|
|
/* any space left... */
|
2006-04-05 08:45:45 +00:00
|
|
|
if (!rtlx_write_poll(minor)) {
|
2005-07-14 15:57:16 +00:00
|
|
|
|
|
|
|
if (file->f_flags & O_NONBLOCK)
|
2005-10-31 00:30:39 +00:00
|
|
|
return -EAGAIN;
|
2005-07-14 15:57:16 +00:00
|
|
|
|
|
|
|
add_wait_queue(&channel_wqs[minor].rt_queue, &wait);
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
|
2006-04-05 08:45:45 +00:00
|
|
|
while (!rtlx_write_poll(minor))
|
2005-07-14 15:57:16 +00:00
|
|
|
schedule();
|
|
|
|
|
|
|
|
set_current_state(TASK_RUNNING);
|
|
|
|
remove_wait_queue(&channel_wqs[minor].rt_queue, &wait);
|
|
|
|
}
|
|
|
|
|
2006-04-05 08:45:45 +00:00
|
|
|
return rtlx_write(minor, (void *)buffer, count, 1);
|
2005-07-14 15:57:16 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct file_operations rtlx_fops = {
|
2006-04-05 08:45:45 +00:00
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.open = file_open,
|
|
|
|
.release = file_release,
|
|
|
|
.write = file_write,
|
|
|
|
.read = file_read,
|
|
|
|
.poll = file_poll
|
2005-07-14 15:57:16 +00:00
|
|
|
};
|
|
|
|
|
2006-04-05 08:45:45 +00:00
|
|
|
static struct irqaction rtlx_irq = {
|
|
|
|
.handler = rtlx_interrupt,
|
|
|
|
.flags = SA_INTERRUPT,
|
|
|
|
.name = "RTLX",
|
|
|
|
};
|
|
|
|
|
|
|
|
static int rtlx_irq_num = MIPSCPU_INT_BASE + MIPS_CPU_RTLX_IRQ;
|
|
|
|
|
2005-10-31 00:30:39 +00:00
|
|
|
static char register_chrdev_failed[] __initdata =
|
|
|
|
KERN_ERR "rtlx_module_init: unable to register device\n";
|
|
|
|
|
2006-04-05 08:45:45 +00:00
|
|
|
static int rtlx_module_init(void)
|
2005-07-14 15:57:16 +00:00
|
|
|
{
|
2006-04-05 08:45:45 +00:00
|
|
|
int i;
|
|
|
|
|
2005-10-31 00:30:39 +00:00
|
|
|
major = register_chrdev(0, module_name, &rtlx_fops);
|
|
|
|
if (major < 0) {
|
|
|
|
printk(register_chrdev_failed);
|
|
|
|
return major;
|
2005-07-14 15:57:16 +00:00
|
|
|
}
|
|
|
|
|
2006-04-05 08:45:45 +00:00
|
|
|
/* initialise the wait queues */
|
|
|
|
for (i = 0; i < RTLX_CHANNELS; i++) {
|
|
|
|
init_waitqueue_head(&channel_wqs[i].rt_queue);
|
|
|
|
init_waitqueue_head(&channel_wqs[i].lx_queue);
|
|
|
|
channel_wqs[i].in_open = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* set up notifiers */
|
|
|
|
notify.start = starting;
|
|
|
|
notify.stop = stopping;
|
|
|
|
vpe_notify(RTLX_TARG_VPE, ¬ify);
|
|
|
|
|
|
|
|
if (cpu_has_vint)
|
|
|
|
set_vi_handler(MIPS_CPU_RTLX_IRQ, rtlx_dispatch);
|
|
|
|
|
|
|
|
rtlx_irq.dev_id = rtlx;
|
|
|
|
setup_irq(rtlx_irq_num, &rtlx_irq);
|
|
|
|
|
2005-10-31 00:30:39 +00:00
|
|
|
return 0;
|
2005-07-14 15:57:16 +00:00
|
|
|
}
|
|
|
|
|
2005-10-31 00:30:39 +00:00
|
|
|
static void __exit rtlx_module_exit(void)
|
2005-07-14 15:57:16 +00:00
|
|
|
{
|
|
|
|
unregister_chrdev(major, module_name);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(rtlx_module_init);
|
|
|
|
module_exit(rtlx_module_exit);
|
2005-10-31 00:30:39 +00:00
|
|
|
|
2005-07-14 15:57:16 +00:00
|
|
|
MODULE_DESCRIPTION("MIPS RTLX");
|
2006-04-05 08:45:45 +00:00
|
|
|
MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
|
2005-07-14 15:57:16 +00:00
|
|
|
MODULE_LICENSE("GPL");
|