/*
* Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
+ * Copyright (C) 2005, 06 Ralf Baechle (ralf@linux-mips.org)
*
* This program is free software; you can distribute it and/or modify it
* under the terms of the GNU General Public License (Version 2) as
#include <asm/cpu.h>
#include <asm/processor.h>
#include <asm/system.h>
+#include <asm/vpe.h>
#include <asm/rtlx.h>
-#define RTLX_MAJOR 64
#define RTLX_TARG_VPE 1
-struct rtlx_info *rtlx;
+static struct rtlx_info *rtlx;
static int major;
static char module_name[] = "rtlx";
-static inline int spacefree(int read, int write, int size);
static struct chan_waitqueues {
wait_queue_head_t rt_queue;
wait_queue_head_t lx_queue;
+ int in_open;
} channel_wqs[RTLX_CHANNELS];
static struct irqaction irq;
static int irq_num;
+static struct vpe_notifications notify;
+static int sp_stopping = 0;
extern void *vpe_get_shared(int index);
do_IRQ(MIPSCPU_INT_BASE + MIPS_CPU_RTLX_IRQ, regs);
}
-irqreturn_t rtlx_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+
+/* Interrupt handler may be called before rtlx_init has otherwise had
+ a chance to run.
+*/
+static irqreturn_t rtlx_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
- irqreturn_t r = IRQ_HANDLED;
int i;
for (i = 0; i < RTLX_CHANNELS; i++) {
- struct rtlx_channel *chan = &rtlx->channel[i];
-
- if (chan->lx_read != chan->lx_write)
- wake_up_interruptible(&channel_wqs[i].lx_queue);
+ wake_up(&channel_wqs[i].lx_queue);
+ wake_up(&channel_wqs[i].rt_queue);
}
- return r;
+ return IRQ_HANDLED;
}
-void dump_rtlx(void)
+static __attribute_used__ void dump_rtlx(void)
{
int i;
/* call when we have the address of the shared structure from the SP side. */
static int rtlx_init(struct rtlx_info *rtlxi)
{
- int i;
-
if (rtlxi->id != RTLX_ID) {
- printk(KERN_WARNING "no valid RTLX id at 0x%p\n", rtlxi);
- return (-ENOEXEC);
+ printk(KERN_ERR "no valid RTLX id at 0x%p 0x%x\n", rtlxi, rtlxi->id);
+ return -ENOEXEC;
}
- /* 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);
- }
+ rtlx = rtlxi;
- /* set up for interrupt handling */
- memset(&irq, 0, sizeof(struct irqaction));
+ return 0;
+}
- if (cpu_has_vint) {
- set_vi_handler(MIPS_CPU_RTLX_IRQ, rtlx_dispatch);
- }
+/* notifications */
+static void starting(int vpe)
+{
+ int i;
+ sp_stopping = 0;
- irq_num = MIPSCPU_INT_BASE + MIPS_CPU_RTLX_IRQ;
- irq.handler = rtlx_interrupt;
- irq.flags = SA_INTERRUPT;
- irq.name = "RTLX";
- irq.dev_id = rtlx;
- setup_irq(irq_num, &irq);
+ /* force a reload of rtlx */
+ rtlx=NULL;
- rtlx = rtlxi;
- return (0);
+ /* wake up any sleeping rtlx_open's */
+ for (i = 0; i < RTLX_CHANNELS; i++)
+ wake_up_interruptible(&channel_wqs[i].lx_queue);
+}
+
+static void stopping(int vpe)
+{
+ int i;
+
+ sp_stopping = 1;
+ for (i = 0; i < RTLX_CHANNELS; i++)
+ wake_up_interruptible(&channel_wqs[i].lx_queue);
}
-/* only allow one open process at a time to open each channel */
-static int rtlx_open(struct inode *inode, struct file *filp)
+
+int rtlx_open(int index, int can_sleep)
{
- int minor, ret;
+ int ret;
struct rtlx_channel *chan;
+ volatile struct rtlx_info **p;
- /* assume only 1 device at the mo. */
- minor = MINOR(inode->i_rdev);
+ if (index >= RTLX_CHANNELS) {
+ printk(KERN_DEBUG "rtlx_open index out of range\n");
+ return -ENOSYS;
+ }
+
+ if (channel_wqs[index].in_open) {
+ printk(KERN_DEBUG "rtlx_open channel %d already opened\n", index);
+ return -EBUSY;
+ }
+
+ channel_wqs[index].in_open++;
if (rtlx == NULL) {
- struct rtlx_info **p;
if( (p = vpe_get_shared(RTLX_TARG_VPE)) == NULL) {
- printk(" vpe_get_shared is NULL. Has an SP program been loaded?\n");
- return (-EFAULT);
+ if (can_sleep) {
+ DECLARE_WAITQUEUE(wait, current);
+
+ /* go to sleep */
+ add_wait_queue(&channel_wqs[index].lx_queue, &wait);
+
+ set_current_state(TASK_INTERRUPTIBLE);
+ while ((p = vpe_get_shared(RTLX_TARG_VPE)) == NULL) {
+ schedule();
+ set_current_state(TASK_INTERRUPTIBLE);
+ }
+
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&channel_wqs[index].lx_queue, &wait);
+
+ /* back running */
+ } else {
+ printk( KERN_DEBUG "No SP program loaded, and device "
+ "opened with O_NONBLOCK\n");
+ channel_wqs[index].in_open = 0;
+ return -ENOSYS;
+ }
}
if (*p == NULL) {
- printk(" vpe_shared %p %p\n", p, *p);
- return (-EFAULT);
+ if (can_sleep) {
+ DECLARE_WAITQUEUE(wait, current);
+
+ /* go to sleep */
+ add_wait_queue(&channel_wqs[index].lx_queue, &wait);
+
+ set_current_state(TASK_INTERRUPTIBLE);
+ while (*p == NULL) {
+ schedule();
+
+ /* reset task state to interruptable otherwise
+ we'll whizz round here like a very fast loopy
+ thing. schedule() appears to return with state
+ set to TASK_RUNNING.
+
+ If the loaded SP program, for whatever reason,
+ doesn't set up the shared structure *p will never
+ become true. So whoever connected to either /dev/rt?
+ or if it was kspd, will then take up rather a lot of
+ processor cycles.
+ */
+
+ set_current_state(TASK_INTERRUPTIBLE);
+ }
+
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&channel_wqs[index].lx_queue, &wait);
+
+ /* back running */
+ }
+ else {
+ printk(" *vpe_get_shared is NULL. "
+ "Has an SP program been loaded?\n");
+ channel_wqs[index].in_open = 0;
+ return -ENOSYS;
+ }
+ }
+
+ if ((unsigned int)*p < KSEG0) {
+ printk(KERN_WARNING "vpe_get_shared returned an invalid pointer "
+ "maybe an error code %d\n", (int)*p);
+ channel_wqs[index].in_open = 0;
+ return -ENOSYS;
}
- if ((ret = rtlx_init(*p)) < 0)
- return (ret);
+ if ((ret = rtlx_init(*p)) < 0) {
+ channel_wqs[index].in_open = 0;
+ return ret;
+ }
}
- chan = &rtlx->channel[minor];
+ chan = &rtlx->channel[index];
- /* already open? */
- if (chan->lx_state == RTLX_STATE_OPENED)
- return (-EBUSY);
+ if (chan->lx_state == RTLX_STATE_OPENED) {
+ channel_wqs[index].in_open = 0;
+ return -EBUSY;
+ }
- chan->lx_state = RTLX_STATE_OPENED;
- return (0);
+ chan->lx_state = RTLX_STATE_OPENED;
+ channel_wqs[index].in_open = 0;
+ return 0;
}
-static int rtlx_release(struct inode *inode, struct file *filp)
+int rtlx_release(int index)
{
- int minor;
-
- minor = MINOR(inode->i_rdev);
- rtlx->channel[minor].lx_state = RTLX_STATE_UNUSED;
- return (0);
+ rtlx->channel[index].lx_state = RTLX_STATE_UNUSED;
+ return 0;
}
-static unsigned int rtlx_poll(struct file *file, poll_table * wait)
+unsigned int rtlx_read_poll(int index, int can_sleep)
{
- int minor;
- unsigned int mask = 0;
- struct rtlx_channel *chan;
+ struct rtlx_channel *chan;
- minor = MINOR(file->f_dentry->d_inode->i_rdev);
- chan = &rtlx->channel[minor];
+ if (rtlx == NULL)
+ return 0;
- poll_wait(file, &channel_wqs[minor].rt_queue, wait);
- poll_wait(file, &channel_wqs[minor].lx_queue, wait);
+ chan = &rtlx->channel[index];
/* data available to read? */
- if (chan->lx_read != chan->lx_write)
- mask |= POLLIN | POLLRDNORM;
+ if (chan->lx_read == chan->lx_write) {
+ if (can_sleep) {
+ DECLARE_WAITQUEUE(wait, current);
- /* space to write */
- if (spacefree(chan->rt_read, chan->rt_write, chan->buffer_size))
- mask |= POLLOUT | POLLWRNORM;
+ /* go to sleep */
+ add_wait_queue(&channel_wqs[index].lx_queue, &wait);
+
+ set_current_state(TASK_INTERRUPTIBLE);
+ while (chan->lx_read == chan->lx_write) {
+ schedule();
+
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ if (sp_stopping) {
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&channel_wqs[index].lx_queue, &wait);
+ return 0;
+ }
+ }
- return (mask);
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&channel_wqs[index].lx_queue, &wait);
+
+ /* back running */
+ }
+ else
+ return 0;
+ }
+
+ return (chan->lx_write + chan->buffer_size - chan->lx_read)
+ % chan->buffer_size;
}
-static ssize_t rtlx_read(struct file *file, char __user * buffer, size_t count,
- loff_t * ppos)
+static inline int write_spacefree(int read, int write, int size)
{
- size_t fl = 0L;
- int minor;
- struct rtlx_channel *lx;
- DECLARE_WAITQUEUE(wait, current);
+ if (read == write) {
+ /*
+ * Never fill the buffer completely, so indexes are always
+ * equal if empty and only empty, or !equal if data available
+ */
+ return size - 1;
+ }
- minor = MINOR(file->f_dentry->d_inode->i_rdev);
- lx = &rtlx->channel[minor];
+ return ((read + size - write) % size) - 1;
+}
- /* data available? */
- if (lx->lx_write == lx->lx_read) {
- if (file->f_flags & O_NONBLOCK)
- return (0); // -EAGAIN makes cat whinge
+unsigned int rtlx_write_poll(int index)
+{
+ struct rtlx_channel *chan = &rtlx->channel[index];
+ return write_spacefree(chan->rt_read, chan->rt_write, chan->buffer_size);
+}
- /* go to sleep */
- add_wait_queue(&channel_wqs[minor].lx_queue, &wait);
- set_current_state(TASK_INTERRUPTIBLE);
+static inline void copy_to(void *dst, void *src, size_t count, int user)
+{
+ if (user)
+ copy_to_user(dst, src, count);
+ else
+ memcpy(dst, src, count);
+}
- while (lx->lx_write == lx->lx_read)
- schedule();
+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);
+}
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&channel_wqs[minor].lx_queue, &wait);
+ssize_t rtlx_read(int index, void *buff, size_t count, int user)
+{
+ size_t fl = 0L;
+ struct rtlx_channel *lx;
- /* back running */
- }
+ if (rtlx == NULL)
+ return -ENOSYS;
+
+ lx = &rtlx->channel[index];
/* find out how much in total */
- count = min( count,
- (size_t)(lx->lx_write + lx->buffer_size - lx->lx_read) % lx->buffer_size);
+ count = min(count,
+ (size_t)(lx->lx_write + lx->buffer_size - lx->lx_read)
+ % lx->buffer_size);
/* then how much from the read pointer onwards */
fl = min( count, (size_t)lx->buffer_size - lx->lx_read);
- copy_to_user (buffer, &lx->lx_buffer[lx->lx_read], fl);
+ copy_to(buff, &lx->lx_buffer[lx->lx_read], fl, user);
/* and if there is anything left at the beginning of the buffer */
if ( count - fl )
- copy_to_user (buffer + fl, lx->lx_buffer, count - fl);
+ copy_to (buff + fl, lx->lx_buffer, count - fl, user);
/* update the index */
lx->lx_read += count;
lx->lx_read %= lx->buffer_size;
- return (count);
+ return count;
}
-static inline int spacefree(int read, int write, int size)
+ssize_t rtlx_write(int index, void *buffer, size_t count, int user)
{
- if (read == write) {
- /* never fill the buffer completely, so indexes are always equal if empty
- and only empty, or !equal if data available */
- return (size - 1);
+ 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 ((read + size - write) % size) - 1;
+ return rtlx_read(minor, buffer, count, 1);
}
-static ssize_t rtlx_write(struct file *file, const char __user * buffer,
+static ssize_t file_write(struct file *file, const char __user * buffer,
size_t count, loff_t * ppos)
{
int minor;
struct rtlx_channel *rt;
- size_t fl;
DECLARE_WAITQUEUE(wait, current);
minor = MINOR(file->f_dentry->d_inode->i_rdev);
rt = &rtlx->channel[minor];
/* any space left... */
- if (!spacefree(rt->rt_read, rt->rt_write, rt->buffer_size)) {
+ if (!rtlx_write_poll(minor)) {
if (file->f_flags & O_NONBLOCK)
- return (-EAGAIN);
+ return -EAGAIN;
add_wait_queue(&channel_wqs[minor].rt_queue, &wait);
set_current_state(TASK_INTERRUPTIBLE);
- while (!spacefree(rt->rt_read, rt->rt_write, rt->buffer_size))
+ while (!rtlx_write_poll(minor))
schedule();
set_current_state(TASK_RUNNING);
remove_wait_queue(&channel_wqs[minor].rt_queue, &wait);
}
- /* total number of bytes to copy */
- count = min( count, (size_t)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_user(&rt->rt_buffer[rt->rt_write], buffer, fl);
-
- /* if there's any left copy to the beginning of the buffer */
- if( count - fl )
- copy_from_user(rt->rt_buffer, buffer + fl, count - fl);
-
- rt->rt_write += count;
- rt->rt_write %= rt->buffer_size;
-
- return(count);
+ return rtlx_write(minor, (void *)buffer, count, 1);
}
static struct file_operations rtlx_fops = {
- .owner = THIS_MODULE,
- .open = rtlx_open,
- .release = rtlx_release,
- .write = rtlx_write,
- .read = rtlx_read,
- .poll = rtlx_poll
+ .owner = THIS_MODULE,
+ .open = file_open,
+ .release = file_release,
+ .write = file_write,
+ .read = file_read,
+ .poll = file_poll
+};
+
+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;
+
+static char register_chrdev_failed[] __initdata =
+ KERN_ERR "rtlx_module_init: unable to register device\n";
+
static int rtlx_module_init(void)
{
- if ((major = register_chrdev(RTLX_MAJOR, module_name, &rtlx_fops)) < 0) {
- printk("rtlx_module_init: unable to register device\n");
- return (-EBUSY);
+ int i;
+
+ major = register_chrdev(0, module_name, &rtlx_fops);
+ if (major < 0) {
+ printk(register_chrdev_failed);
+ return major;
}
- if (major == 0)
- major = RTLX_MAJOR;
+ /* 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;
+ }
- return (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);
+
+ return 0;
}
-static void rtlx_module_exit(void)
+static void __exit rtlx_module_exit(void)
{
unregister_chrdev(major, module_name);
}
module_init(rtlx_module_init);
module_exit(rtlx_module_exit);
+
MODULE_DESCRIPTION("MIPS RTLX");
-MODULE_AUTHOR("Elizabeth Clarke, MIPS Technologies, Inc");
+MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
MODULE_LICENSE("GPL");
git.samba.org / sfrench / cifs-2.6.git / blobdiff