Turn rtlx upside down. (afc4841d) · Commits · e / devices / android_kernel_oneplus_sm7250

arch/mips/kernel/rtlx.c

+93 −104

Original line number	Diff line number	Diff line
		@@ -20,42 +20,42 @@
		#include <linux/module.h>
		#include <linux/fs.h>
		#include <linux/init.h>
		#include <asm/uaccess.h>
		#include <linux/slab.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/cacheflush.h>
		#include <asm/atomic.h>
		#include <asm/bitops.h>
		#include <asm/cpu.h>
		#include <asm/processor.h>
		#include <asm/system.h>
		#include <asm/rtlx.h>
		#include <asm/uaccess.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 irqaction irq;
		static int irq_num;

		static inline int 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;
		}

		static struct chan_waitqueues {
		wait_queue_head_t rt_queue;
		wait_queue_head_t lx_queue;
		} channel_wqs[RTLX_CHANNELS];

		static struct irqaction irq;
		static int irq_num;

		extern void *vpe_get_shared(int index);

		static void rtlx_dispatch(struct pt_regs *regs)
		@@ -63,9 +63,8 @@ static void rtlx_dispatch(struct pt_regs *regs)
		do_IRQ(MIPSCPU_INT_BASE + MIPS_CPU_RTLX_IRQ, regs);
		}

		irqreturn_t rtlx_interrupt(int irq, void dev_id, struct pt_regs regs)
		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++) {
		@@ -75,30 +74,7 @@ irqreturn_t rtlx_interrupt(int irq, void dev_id, struct pt_regs regs)
		wake_up_interruptible(&channel_wqs[i].lx_queue);
		}

		return r;
		}

		void 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);
		}
		return IRQ_HANDLED;
		}

		/* call when we have the address of the shared structure from the SP side. */
		@@ -108,7 +84,7 @@ static int rtlx_init(struct rtlx_info *rtlxi)

		if (rtlxi->id != RTLX_ID) {
		printk(KERN_WARNING "no valid RTLX id at 0x%p\n", rtlxi);
		return (-ENOEXEC);
		return -ENOEXEC;
		}

		/* initialise the wait queues */
		@@ -120,9 +96,8 @@ static int rtlx_init(struct rtlx_info *rtlxi)
		/* set up for interrupt handling */
		memset(&irq, 0, sizeof(struct irqaction));

		if (cpu_has_vint) {
		if (cpu_has_vint)
		set_vi_handler(MIPS_CPU_RTLX_IRQ, rtlx_dispatch);
		}

		irq_num = MIPSCPU_INT_BASE + MIPS_CPU_RTLX_IRQ;
		irq.handler = rtlx_interrupt;
		@@ -132,7 +107,8 @@ static int rtlx_init(struct rtlx_info *rtlxi)
		setup_irq(irq_num, &irq);

		rtlx = rtlxi;
		return (0);

		return 0;
		}

		/* only allow one open process at a time to open each channel */
		@@ -147,36 +123,36 @@ static int rtlx_open(struct inode inode, struct file filp)
		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);
		printk(KERN_ERR "vpe_get_shared is NULL. "
		"Has an SP program been loaded?\n");
		return -EFAULT;
		}

		if (*p == NULL) {
		printk(" vpe_shared %p %p\n", p, *p);
		return (-EFAULT);
		printk(KERN_ERR "vpe_shared %p %p\n", p, *p);
		return -EFAULT;
		}

		if ((ret = rtlx_init(*p)) < 0)
		return (ret);
		return ret;
		}

		chan = &rtlx->channel[minor];

		/* already open? */
		if (chan->lx_state == RTLX_STATE_OPENED)
		return (-EBUSY);
		if (test_and_set_bit(RTLX_STATE_OPENED, &chan->lx_state))
		return -EBUSY;

		chan->lx_state = RTLX_STATE_OPENED;
		return (0);
		return 0;
		}

		static int rtlx_release(struct inode inode, struct file filp)
		{
		int minor;
		int minor = MINOR(inode->i_rdev);

		minor = MINOR(inode->i_rdev);
		rtlx->channel[minor].lx_state = RTLX_STATE_UNUSED;
		return (0);
		clear_bit(RTLX_STATE_OPENED, &rtlx->channel[minor].lx_state);
		smp_mb__after_clear_bit();

		return 0;
		}

		static unsigned int rtlx_poll(struct file file, poll_table wait)
		@@ -199,12 +175,13 @@ static unsigned int rtlx_poll(struct file file, poll_table wait)
		if (spacefree(chan->rt_read, chan->rt_write, chan->buffer_size))
		mask \|= POLLOUT \| POLLWRNORM;

		return (mask);
		return mask;
		}

		static ssize_t rtlx_read(struct file file, char __user buffer, size_t count,
		loff_t * ppos)
		{
		unsigned long failed;
		size_t fl = 0L;
		int minor;
		struct rtlx_channel *lx;
		@@ -216,7 +193,7 @@ static ssize_t rtlx_read(struct file file, char __user buffer, size_t count,
		/* data available? */
		if (lx->lx_write == lx->lx_read) {
		if (file->f_flags & O_NONBLOCK)
		return (0); // -EAGAIN makes cat whinge
		return 0; /* -EAGAIN makes cat whinge */

		/* go to sleep */
		add_wait_queue(&channel_wqs[minor].lx_queue, &wait);
		@@ -238,33 +215,33 @@ static ssize_t rtlx_read(struct file file, char __user buffer, size_t count,
		/* 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);
		failed = copy_to_user (buffer, &lx->lx_buffer[lx->lx_read], fl);
		if (failed) {
		count = fl - failed;
		goto out;
		}

		/* 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);
		if (count - fl) {
		failed = copy_to_user (buffer + fl, lx->lx_buffer, count - fl);
		if (failed) {
		count -= failed;
		goto out;
		}
		}

		out:
		/* update the index */
		lx->lx_read += count;
		lx->lx_read %= lx->buffer_size;

		return (count);
		}

		static inline int 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;
		return count;
		}

		static ssize_t rtlx_write(struct file file, const char __user buffer,
		size_t count, loff_t * ppos)
		{
		unsigned long failed;
		int minor;
		struct rtlx_channel *rt;
		size_t fl;
		@@ -277,7 +254,7 @@ static ssize_t rtlx_write(struct file file, const char __user buffer,
		if (!spacefree(rt->rt_read, rt->rt_write, rt->buffer_size)) {

		if (file->f_flags & O_NONBLOCK)
		return (-EAGAIN);
		return -EAGAIN;

		add_wait_queue(&channel_wqs[minor].rt_queue, &wait);
		set_current_state(TASK_INTERRUPTIBLE);
		@@ -295,16 +272,26 @@ static ssize_t rtlx_write(struct file file, const char __user buffer,
		/* 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);
		failed = copy_from_user(&rt->rt_buffer[rt->rt_write], buffer, fl);
		if (failed) {
		count = fl - failed;
		goto out;
		}

		/* 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);
		if (count - fl) {
		failed = copy_from_user(rt->rt_buffer, buffer + fl, count - fl);
		if (failed) {
		count -= failed;
		goto out;
		}
		}

		out:
		rt->rt_write += count;
		rt->rt_write %= rt->buffer_size;

		return(count);
		return count;
		}

		static struct file_operations rtlx_fops = {
		@@ -316,26 +303,28 @@ static struct file_operations rtlx_fops = {
		.poll = rtlx_poll
		};

		static int rtlx_module_init(void)
		static char register_chrdev_failed[] __initdata =
		KERN_ERR "rtlx_module_init: unable to register device\n";

		static int __init 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);
		major = register_chrdev(0, module_name, &rtlx_fops);
		if (major < 0) {
		printk(register_chrdev_failed);
		return major;
		}

		if (major == 0)
		major = RTLX_MAJOR;

		return (0);
		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 Clarke, MIPS Technologies, Inc.");
		MODULE_LICENSE("GPL");

include/asm-mips/rtlx.h

+12 −16

Original line number	Diff line number	Diff line
		@@ -16,21 +16,19 @@
		#define RTLX_ID (RTLX_xID \| RTLX_VERSION)
		#define RTLX_CHANNELS 8

		enum rtlx_state {
		RTLX_STATE_UNUSED = 0,
		RTLX_STATE_INITIALISED,
		RTLX_STATE_REMOTE_READY,
		RTLX_STATE_OPENED
		};

		#define RTLX_BUFFER_SIZE 1024

		/*
		* lx_state bits
		*/
		#define RTLX_STATE_OPENED 1UL

		/* each channel supports read and write.
		linux (vpe0) reads lx_buffer and writes rt_buffer
		SP (vpe1) reads rt_buffer and writes lx_buffer
		*/
		typedef struct rtlx_channel {
		enum rtlx_state rt_state;
		enum rtlx_state lx_state;
		struct rtlx_channel {
		unsigned long lx_state;

		int buffer_size;

		@@ -43,14 +41,12 @@ typedef struct rtlx_channel {

		void *queues;

		} rtlx_channel_t;
		};

		typedef struct rtlx_info {
		struct rtlx_info {
		unsigned long id;
		enum rtlx_state state;

		struct rtlx_channel channel[RTLX_CHANNELS];
		};

		} rtlx_info_t;

		#endif
		#endif /* _RTLX_H_ */