Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 562 insertions, 0 deletions

diff --git a/arch/mips/kernel/rtlx.c b/arch/mips/kernel/rtlx.c
new file mode 100644
index 00000000..b8c18dcd
--- /dev/null
+++ b/arch/mips/kernel/rtlx.c
@@ -0,0 +1,562 @@
+/*
+ * 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
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <linux/list.h>
+#include <linux/vmalloc.h>
+#include <linux/elf.h>
+#include <linux/seq_file.h>
+#include <linux/syscalls.h>
+#include <linux/moduleloader.h>
+#include <linux/interrupt.h>
+#include <linux/poll.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <asm/mipsmtregs.h>
+#include <asm/mips_mt.h>
+#include <asm/cacheflush.h>
+#include <linux/atomic.h>
+#include <asm/cpu.h>
+#include <asm/processor.h>
+#include <asm/vpe.h>
+#include <asm/rtlx.h>
+
+static struct rtlx_info *rtlx;
+static int major;
+static char module_name[] = "rtlx";
+
+static struct chan_waitqueues {
+	wait_queue_head_t rt_queue;
+	wait_queue_head_t lx_queue;
+	atomic_t in_open;
+	struct mutex mutex;
+} channel_wqs[RTLX_CHANNELS];
+
+static struct vpe_notifications notify;
+static int sp_stopping;
+
+extern void *vpe_get_shared(int index);
+
+static void rtlx_dispatch(void)
+{
+	do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ);
+}
+
+
+/* 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)
+{
+	unsigned int vpeflags;
+	unsigned long flags;
+	int i;
+
+	/* Ought not to be strictly necessary for SMTC builds */
+	local_irq_save(flags);
+	vpeflags = dvpe();
+	set_c0_status(0x100 << MIPS_CPU_RTLX_IRQ);
+	irq_enable_hazard();
+	evpe(vpeflags);
+	local_irq_restore(flags);
+
+	for (i = 0; i < RTLX_CHANNELS; i++) {
+			wake_up(&channel_wqs[i].lx_queue);
+			wake_up(&channel_wqs[i].rt_queue);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void __used dump_rtlx(void)
+{
+	int i;
+
+	printk("id 0x%lx state %d\n", rtlx->id, rtlx->state);
+
+	for (i = 0; i < RTLX_CHANNELS; i++) {
+		struct rtlx_channel *chan = &rtlx->channel[i];
+
+		printk(" rt_state %d lx_state %d buffer_size %d\n",
+		       chan->rt_state, chan->lx_state, chan->buffer_size);
+
+		printk(" rt_read %d rt_write %d\n",
+		       chan->rt_read, chan->rt_write);
+
+		printk(" lx_read %d lx_write %d\n",
+		       chan->lx_read, chan->lx_write);
+
+		printk(" rt_buffer <%s>\n", chan->rt_buffer);
+		printk(" lx_buffer <%s>\n", chan->lx_buffer);
+	}
+}
+
+/* call when we have the address of the shared structure from the SP side. */
+static int rtlx_init(struct rtlx_info *rtlxi)
+{
+	if (rtlxi->id != RTLX_ID) {
+		printk(KERN_ERR "no valid RTLX id at 0x%p 0x%lx\n",
+			rtlxi, rtlxi->id);
+		return -ENOEXEC;
+	}
+
+	rtlx = rtlxi;
+
+	return 0;
+}
+
+/* notifications */
+static void starting(int vpe)
+{
+	int i;
+	sp_stopping = 0;
+
+	/* force a reload of rtlx */
+	rtlx=NULL;
+
+	/* 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);
+}
+
+
+int rtlx_open(int index, int can_sleep)
+{
+	struct rtlx_info **p;
+	struct rtlx_channel *chan;
+	enum rtlx_state state;
+	int ret = 0;
+
+	if (index >= RTLX_CHANNELS) {
+		printk(KERN_DEBUG "rtlx_open index out of range\n");
+		return -ENOSYS;
+	}
+
+	if (atomic_inc_return(&channel_wqs[index].in_open) > 1) {
+		printk(KERN_DEBUG "rtlx_open channel %d already opened\n",
+		       index);
+		ret = -EBUSY;
+		goto out_fail;
+	}
+
+	if (rtlx == NULL) {
+		if( (p = vpe_get_shared(tclimit)) == NULL) {
+		    if (can_sleep) {
+			__wait_event_interruptible(channel_wqs[index].lx_queue,
+				(p = vpe_get_shared(tclimit)), ret);
+			if (ret)
+				goto out_fail;
+		    } else {
+			printk(KERN_DEBUG "No SP program loaded, and device "
+					"opened with O_NONBLOCK\n");
+			ret = -ENOSYS;
+			goto out_fail;
+		    }
+		}
+
+		smp_rmb();
+		if (*p == NULL) {
+			if (can_sleep) {
+				DEFINE_WAIT(wait);
+
+				for (;;) {
+					prepare_to_wait(
+						&channel_wqs[index].lx_queue,
+						&wait, TASK_INTERRUPTIBLE);
+					smp_rmb();
+					if (*p != NULL)
+						break;
+					if (!signal_pending(current)) {
+						schedule();
+						continue;
+					}
+					ret = -ERESTARTSYS;
+					goto out_fail;
+				}
+				finish_wait(&channel_wqs[index].lx_queue, &wait);
+			} else {
+				pr_err(" *vpe_get_shared is NULL. "
+				       "Has an SP program been loaded?\n");
+				ret = -ENOSYS;
+				goto out_fail;
+			}
+		}
+
+		if ((unsigned int)*p < KSEG0) {
+			printk(KERN_WARNING "vpe_get_shared returned an "
+			       "invalid pointer maybe an error code %d\n",
+			       (int)*p);
+			ret = -ENOSYS;
+			goto out_fail;
+		}
+
+		if ((ret = rtlx_init(*p)) < 0)
+			goto out_ret;
+	}
+
+	chan = &rtlx->channel[index];
+
+	state = xchg(&chan->lx_state, RTLX_STATE_OPENED);
+	if (state == RTLX_STATE_OPENED) {
+		ret = -EBUSY;
+		goto out_fail;
+	}
+
+out_fail:
+	smp_mb();
+	atomic_dec(&channel_wqs[index].in_open);
+	smp_mb();
+
+out_ret:
+	return ret;
+}
+
+int rtlx_release(int index)
+{
+	if (rtlx == NULL) {
+		pr_err("rtlx_release() with null rtlx\n");
+		return 0;
+	}
+	rtlx->channel[index].lx_state = RTLX_STATE_UNUSED;
+	return 0;
+}
+
+unsigned int rtlx_read_poll(int index, int can_sleep)
+{
+ 	struct rtlx_channel *chan;
+
+ 	if (rtlx == NULL)
+ 		return 0;
+
+ 	chan = &rtlx->channel[index];
+
+	/* data available to read? */
+	if (chan->lx_read == chan->lx_write) {
+		if (can_sleep) {
+			int ret = 0;
+
+			__wait_event_interruptible(channel_wqs[index].lx_queue,
+				(chan->lx_read != chan->lx_write) ||
+				sp_stopping, ret);
+			if (ret)
+				return ret;
+
+			if (sp_stopping)
+				return 0;
+		} else
+			return 0;
+	}
+
+	return (chan->lx_write + chan->buffer_size - chan->lx_read)
+	       % chan->buffer_size;
+}
+
+static inline int write_spacefree(int read, int write, int size)
+{
+	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;
+	}
+
+	return ((read + size - write) % size) - 1;
+}
+
+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);
+}
+
+ssize_t rtlx_read(int index, void __user *buff, size_t count)
+{
+	size_t lx_write, fl = 0L;
+	struct rtlx_channel *lx;
+	unsigned long failed;
+
+	if (rtlx == NULL)
+		return -ENOSYS;
+
+	lx = &rtlx->channel[index];
+
+	mutex_lock(&channel_wqs[index].mutex);
+	smp_rmb();
+	lx_write = lx->lx_write;
+
+	/* find out how much in total */
+	count = min(count,
+		     (size_t)(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);
+
+	failed = copy_to_user(buff, lx->lx_buffer + lx->lx_read, fl);
+	if (failed)
+		goto out;
+
+	/* and if there is anything left at the beginning of the buffer */
+	if (count - fl)
+		failed = copy_to_user(buff + fl, lx->lx_buffer, count - fl);
+
+out:
+	count -= failed;
+
+	smp_wmb();
+	lx->lx_read = (lx->lx_read + count) % lx->buffer_size;
+	smp_wmb();
+	mutex_unlock(&channel_wqs[index].mutex);
+
+	return count;
+}
+
+ssize_t rtlx_write(int index, const void __user *buffer, size_t count)
+{
+	struct rtlx_channel *rt;
+	unsigned long failed;
+	size_t rt_read;
+	size_t fl;
+
+	if (rtlx == NULL)
+		return(-ENOSYS);
+
+	rt = &rtlx->channel[index];
+
+	mutex_lock(&channel_wqs[index].mutex);
+	smp_rmb();
+	rt_read = rt->rt_read;
+
+	/* total number of bytes to copy */
+	count = min(count, (size_t)write_spacefree(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);
+
+	failed = copy_from_user(rt->rt_buffer + rt->rt_write, buffer, fl);
+	if (failed)
+		goto out;
+
+	/* if there's any left copy to the beginning of the buffer */
+	if (count - fl) {
+		failed = copy_from_user(rt->rt_buffer, buffer + fl, count - fl);
+	}
+
+out:
+	count -= failed;
+
+	smp_wmb();
+	rt->rt_write = (rt->rt_write + count) % rt->buffer_size;
+	smp_wmb();
+	mutex_unlock(&channel_wqs[index].mutex);
+
+	return count;
+}
+
+
+static int file_open(struct inode *inode, struct file *filp)
+{
+	return rtlx_open(iminor(inode), (filp->f_flags & O_NONBLOCK) ? 0 : 1);
+}
+
+static int file_release(struct inode *inode, struct file *filp)
+{
+	return rtlx_release(iminor(inode));
+}
+
+static unsigned int file_poll(struct file *file, poll_table * wait)
+{
+	int minor;
+	unsigned int mask = 0;
+
+	minor = iminor(file->f_path.dentry->d_inode);
+
+	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 = iminor(file->f_path.dentry->d_inode);
+
+	/* 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);
+}
+
+static ssize_t file_write(struct file *file, const char __user * buffer,
+			  size_t count, loff_t * ppos)
+{
+	int minor;
+	struct rtlx_channel *rt;
+
+	minor = iminor(file->f_path.dentry->d_inode);
+	rt = &rtlx->channel[minor];
+
+	/* any space left... */
+	if (!rtlx_write_poll(minor)) {
+		int ret = 0;
+
+		if (file->f_flags & O_NONBLOCK)
+			return -EAGAIN;
+
+		__wait_event_interruptible(channel_wqs[minor].rt_queue,
+		                           rtlx_write_poll(minor),
+		                           ret);
+		if (ret)
+			return ret;
+	}
+
+	return rtlx_write(minor, buffer, count);
+}
+
+static const struct file_operations rtlx_fops = {
+	.owner =   THIS_MODULE,
+	.open =    file_open,
+	.release = file_release,
+	.write =   file_write,
+	.read =    file_read,
+	.poll =    file_poll,
+	.llseek =  noop_llseek,
+};
+
+static struct irqaction rtlx_irq = {
+	.handler	= rtlx_interrupt,
+	.name		= "RTLX",
+};
+
+static int rtlx_irq_num = MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ;
+
+static char register_chrdev_failed[] __initdata =
+	KERN_ERR "rtlx_module_init: unable to register device\n";
+
+static int __init rtlx_module_init(void)
+{
+	struct device *dev;
+	int i, err;
+
+	if (!cpu_has_mipsmt) {
+		printk("VPE loader: not a MIPS MT capable processor\n");
+		return -ENODEV;
+	}
+
+	if (tclimit == 0) {
+		printk(KERN_WARNING "No TCs reserved for AP/SP, not "
+		       "initializing RTLX.\nPass maxtcs=<n> argument as kernel "
+		       "argument\n");
+
+		return -ENODEV;
+	}
+
+	major = register_chrdev(0, module_name, &rtlx_fops);
+	if (major < 0) {
+		printk(register_chrdev_failed);
+		return 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);
+		atomic_set(&channel_wqs[i].in_open, 0);
+		mutex_init(&channel_wqs[i].mutex);
+
+		dev = device_create(mt_class, NULL, MKDEV(major, i), NULL,
+				    "%s%d", module_name, i);
+		if (IS_ERR(dev)) {
+			err = PTR_ERR(dev);
+			goto out_chrdev;
+		}
+	}
+
+	/* set up notifiers */
+	notify.start = starting;
+	notify.stop = stopping;
+	vpe_notify(tclimit, &notify);
+
+	if (cpu_has_vint)
+		set_vi_handler(MIPS_CPU_RTLX_IRQ, rtlx_dispatch);
+	else {
+		pr_err("APRP RTLX init on non-vectored-interrupt processor\n");
+		err = -ENODEV;
+		goto out_chrdev;
+	}
+
+	rtlx_irq.dev_id = rtlx;
+	setup_irq(rtlx_irq_num, &rtlx_irq);
+
+	return 0;
+
+out_chrdev:
+	for (i = 0; i < RTLX_CHANNELS; i++)
+		device_destroy(mt_class, MKDEV(major, i));
+
+	return err;
+}
+
+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");