saa7134-core.c

linux内核源码

/*
 *
 * device driver for philips saa7134 based TV cards
 * driver core
 *
 * (c) 2001-03 Gerd Knorr <[e-mail]> [SuSE Labs]
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/kmod.h>
#include <linux/sound.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/dma-mapping.h>
#include <linux/pm.h>

#include "saa7134-reg.h"
#include "saa7134.h"

MODULE_DESCRIPTION("v4l2 driver module for saa7130/34 based TV cards");
MODULE_AUTHOR("Gerd Knorr <[e-mail]> [SuSE Labs]");
MODULE_LICENSE("GPL");

/* ------------------------------------------------------------------ */

static unsigned int irq_debug = 0;
module_param(irq_debug, int, 0644);
MODULE_PARM_DESC(irq_debug,"enable debug messages [IRQ handler]");

static unsigned int core_debug = 0;
module_param(core_debug, int, 0644);
MODULE_PARM_DESC(core_debug,"enable debug messages [core]");

static unsigned int gpio_tracking = 0;
module_param(gpio_tracking, int, 0644);
MODULE_PARM_DESC(gpio_tracking,"enable debug messages [gpio]");

static unsigned int alsa = 0;
module_param(alsa, int, 0644);
MODULE_PARM_DESC(alsa,"enable ALSA DMA sound [dmasound]");

static unsigned int oss = 0;
module_param(oss, int, 0644);
MODULE_PARM_DESC(oss,"enable OSS DMA sound [dmasound]");

static unsigned int latency = UNSET;
module_param(latency, int, 0444);
MODULE_PARM_DESC(latency,"pci latency timer");

int saa7134_no_overlay=-1;
module_param_named(no_overlay, saa7134_no_overlay, int, 0444);
MODULE_PARM_DESC(no_overlay,"allow override overlay default (0 disables, 1 enables)"
		" [some VIA/SIS chipsets are known to have problem with overlay]");

static unsigned int video_nr[] = {[0 ... (SAA7134_MAXBOARDS - 1)] = UNSET };
static unsigned int vbi_nr[]   = {[0 ... (SAA7134_MAXBOARDS - 1)] = UNSET };
static unsigned int radio_nr[] = {[0 ... (SAA7134_MAXBOARDS - 1)] = UNSET };
static unsigned int tuner[]    = {[0 ... (SAA7134_MAXBOARDS - 1)] = UNSET };
static unsigned int card[]     = {[0 ... (SAA7134_MAXBOARDS - 1)] = UNSET };


module_param_array(video_nr, int, NULL, 0444);
module_param_array(vbi_nr,   int, NULL, 0444);
module_param_array(radio_nr, int, NULL, 0444);
module_param_array(tuner,    int, NULL, 0444);
module_param_array(card,     int, NULL, 0444);

MODULE_PARM_DESC(video_nr, "video device number");
MODULE_PARM_DESC(vbi_nr,   "vbi device number");
MODULE_PARM_DESC(radio_nr, "radio device number");
MODULE_PARM_DESC(tuner,    "tuner type");
MODULE_PARM_DESC(card,     "card type");

static DEFINE_MUTEX(devlist_lock);
LIST_HEAD(saa7134_devlist);
static LIST_HEAD(mops_list);
static unsigned int saa7134_devcount;

int (*saa7134_dmasound_init)(struct saa7134_dev *dev);
int (*saa7134_dmasound_exit)(struct saa7134_dev *dev);

#define dprintk(fmt, arg...)	if (core_debug) \
	printk(KERN_DEBUG "%s/core: " fmt, dev->name , ## arg)

void saa7134_track_gpio(struct saa7134_dev *dev, char *msg)
{
	unsigned long mode,status;

	if (!gpio_tracking)
		return;
	/* rising SAA7134_GPIO_GPRESCAN reads the status */
	saa_andorb(SAA7134_GPIO_GPMODE3,SAA7134_GPIO_GPRESCAN,0);
	saa_andorb(SAA7134_GPIO_GPMODE3,SAA7134_GPIO_GPRESCAN,SAA7134_GPIO_GPRESCAN);
	mode   = saa_readl(SAA7134_GPIO_GPMODE0   >> 2) & 0xfffffff;
	status = saa_readl(SAA7134_GPIO_GPSTATUS0 >> 2) & 0xfffffff;
	printk(KERN_DEBUG
	       "%s: gpio: mode=0x%07lx in=0x%07lx out=0x%07lx [%s]\n",
	       dev->name, mode, (~mode) & status, mode & status, msg);
}

void saa7134_set_gpio(struct saa7134_dev *dev, int bit_no, int value)
{
	u32 index, bitval;

	index = 1 << bit_no;
	switch (value) {
	case 0: /* static value */
	case 1:	dprintk("setting GPIO%d to static %d\n", bit_no, value);
		/* turn sync mode off if necessary */
		if (index & 0x00c00000)
			saa_andorb(SAA7134_VIDEO_PORT_CTRL6, 0x0f, 0x00);
		if (value)
			bitval = index;
		else
			bitval = 0;
		saa_andorl(SAA7134_GPIO_GPMODE0 >> 2, index, index);
		saa_andorl(SAA7134_GPIO_GPSTATUS0 >> 2, index, bitval);
		break;
	case 3:	/* tristate */
		dprintk("setting GPIO%d to tristate\n", bit_no);
		saa_andorl(SAA7134_GPIO_GPMODE0 >> 2, index, 0);
		break;
	}
}

int saa7134_tuner_callback(void *ptr, int command, int arg)
{
	u8 sync_control;
	struct saa7134_dev *dev = ptr;

	switch (dev->tuner_type) {
	case TUNER_PHILIPS_TDA8290:
		switch (command) {
		case 0: /* switch LNA gain through GPIO 22*/
			saa7134_set_gpio(dev, 22, arg) ;
			break;
		case 1: /* vsync output at GPIO22. 50 / 60Hz */
			dprintk("setting GPIO22 to vsync %d\n", arg);
			saa_andorb(SAA7134_VIDEO_PORT_CTRL3, 0x80, 0x80);
			saa_andorb(SAA7134_VIDEO_PORT_CTRL6, 0x0f, 0x03);
			if (arg == 1)
				sync_control = 11;
			else
				sync_control = 17;
			saa_writeb(SAA7134_VGATE_START, sync_control);
			saa_writeb(SAA7134_VGATE_STOP, sync_control + 1);
			saa_andorb(SAA7134_MISC_VGATE_MSB, 0x03, 0x00);
			break;
		default:
			return -EINVAL;
		}
		break;
	default:
		return -ENODEV;
	}
	return 0;
}

/* ------------------------------------------------------------------ */


/* ----------------------------------------------------------- */
/* delayed request_module                                      */

#if defined(CONFIG_MODULES) && defined(MODULE)


static void request_module_async(struct work_struct *work){
	struct saa7134_dev* dev = container_of(work, struct saa7134_dev, request_module_wk);
	if (card_is_empress(dev))
		request_module("saa7134-empress");
	if (card_is_dvb(dev))
		request_module("saa7134-dvb");
	if (alsa)
		request_module("saa7134-alsa");
	if (oss)
		request_module("saa7134-oss");
}

static void request_submodules(struct saa7134_dev *dev)
{
	INIT_WORK(&dev->request_module_wk, request_module_async);
	schedule_work(&dev->request_module_wk);
}

#else
#define request_submodules(dev)
#endif /* CONFIG_MODULES */

/* ------------------------------------------------------------------ */

/* nr of (saa7134-)pages for the given buffer size */
static int saa7134_buffer_pages(int size)
{
	size  = PAGE_ALIGN(size);
	size += PAGE_SIZE; /* for non-page-aligned buffers */
	size /= 4096;
	return size;
}

/* calc max # of buffers from size (must not exceed the 4MB virtual
 * address space per DMA channel) */
int saa7134_buffer_count(unsigned int size, unsigned int count)
{
	unsigned int maxcount;

	maxcount = 1024 / saa7134_buffer_pages(size);
	if (count > maxcount)
		count = maxcount;
	return count;
}

int saa7134_buffer_startpage(struct saa7134_buf *buf)
{
	return saa7134_buffer_pages(buf->vb.bsize) * buf->vb.i;
}

unsigned long saa7134_buffer_base(struct saa7134_buf *buf)
{
	unsigned long base;
	struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);

	base  = saa7134_buffer_startpage(buf) * 4096;
	base += dma->sglist[0].offset;
	return base;
}

/* ------------------------------------------------------------------ */

int saa7134_pgtable_alloc(struct pci_dev *pci, struct saa7134_pgtable *pt)
{
	__le32       *cpu;
	dma_addr_t   dma_addr;

	cpu = pci_alloc_consistent(pci, SAA7134_PGTABLE_SIZE, &dma_addr);
	if (NULL == cpu)
		return -ENOMEM;
	pt->size = SAA7134_PGTABLE_SIZE;
	pt->cpu  = cpu;
	pt->dma  = dma_addr;
	return 0;
}

int saa7134_pgtable_build(struct pci_dev *pci, struct saa7134_pgtable *pt,
			  struct scatterlist *list, unsigned int length,
			  unsigned int startpage)
{
	__le32        *ptr;
	unsigned int  i,p;

	BUG_ON(NULL == pt || NULL == pt->cpu);

	ptr = pt->cpu + startpage;
	for (i = 0; i < length; i++, list++)
		for (p = 0; p * 4096 < list->length; p++, ptr++)
			*ptr = cpu_to_le32(sg_dma_address(list) - list->offset);
	return 0;
}

void saa7134_pgtable_free(struct pci_dev *pci, struct saa7134_pgtable *pt)
{
	if (NULL == pt->cpu)
		return;
	pci_free_consistent(pci, pt->size, pt->cpu, pt->dma);
	pt->cpu = NULL;
}

/* ------------------------------------------------------------------ */

void saa7134_dma_free(struct videobuf_queue *q,struct saa7134_buf *buf)
{
	struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
	BUG_ON(in_interrupt());

	videobuf_waiton(&buf->vb,0,0);
	videobuf_dma_unmap(q, dma);
	videobuf_dma_free(dma);
	buf->vb.state = STATE_NEEDS_INIT;
}

/* ------------------------------------------------------------------ */

int saa7134_buffer_queue(struct saa7134_dev *dev,
			 struct saa7134_dmaqueue *q,
			 struct saa7134_buf *buf)
{
	struct saa7134_buf *next = NULL;

	assert_spin_locked(&dev->slock);
	dprintk("buffer_queue %p\n",buf);
	if (NULL == q->curr) {
		if (!q->need_two) {
			q->curr = buf;
			buf->activate(dev,buf,NULL);
		} else if (list_empty(&q->queue)) {
			list_add_tail(&buf->vb.queue,&q->queue);
			buf->vb.state = STATE_QUEUED;
		} else {
			next = list_entry(q->queue.next,struct saa7134_buf,
					  vb.queue);
			q->curr = buf;
			buf->activate(dev,buf,next);
		}
	} else {
		list_add_tail(&buf->vb.queue,&q->queue);
		buf->vb.state = STATE_QUEUED;
	}
	return 0;
}

void saa7134_buffer_finish(struct saa7134_dev *dev,
			   struct saa7134_dmaqueue *q,
			   unsigned int state)
{
	assert_spin_locked(&dev->slock);
	dprintk("buffer_finish %p\n",q->curr);

	/* finish current buffer */
	q->curr->vb.state = state;
	do_gettimeofday(&q->curr->vb.ts);
	wake_up(&q->curr->vb.done);
	q->curr = NULL;
}

void saa7134_buffer_next(struct saa7134_dev *dev,
			 struct saa7134_dmaqueue *q)
{
	struct saa7134_buf *buf,*next = NULL;

	assert_spin_locked(&dev->slock);
	BUG_ON(NULL != q->curr);

	if (!list_empty(&q->queue)) {
		/* activate next one from queue */
		buf = list_entry(q->queue.next,struct saa7134_buf,vb.queue);
		dprintk("buffer_next %p [prev=%p/next=%p]\n",
			buf,q->queue.prev,q->queue.next);
		list_del(&buf->vb.queue);
		if (!list_empty(&q->queue))
			next = list_entry(q->queue.next,struct saa7134_buf,
					  vb.queue);
		q->curr = buf;
		buf->activate(dev,buf,next);
		dprintk("buffer_next #2 prev=%p/next=%p\n",
			q->queue.prev,q->queue.next);
	} else {
		/* nothing to do -- just stop DMA */
		dprintk("buffer_next %p\n",NULL);
		saa7134_set_dmabits(dev);
		del_timer(&q->timeout);
	}
}

void saa7134_buffer_timeout(unsigned long data)
{
	struct saa7134_dmaqueue *q = (struct saa7134_dmaqueue*)data;
	struct saa7134_dev *dev = q->dev;
	unsigned long flags;

	spin_lock_irqsave(&dev->slock,flags);

	/* try to reset the hardware (SWRST) */
	saa_writeb(SAA7134_REGION_ENABLE, 0x00);
	saa_writeb(SAA7134_REGION_ENABLE, 0x80);
	saa_writeb(SAA7134_REGION_ENABLE, 0x00);

	/* flag current buffer as failed,
	   try to start over with the next one. */
	if (q->curr) {
		dprintk("timeout on %p\n",q->curr);
		saa7134_buffer_finish(dev,q,STATE_ERROR);
	}
	saa7134_buffer_next(dev,q);
	spin_unlock_irqrestore(&dev->slock,flags);
}

/* resends a current buffer in queue after resume */

int saa7134_buffer_requeue(struct saa7134_dev *dev,
			 struct saa7134_dmaqueue *q)
{
	struct saa7134_buf *buf, *next;

	assert_spin_locked(&dev->slock);

	buf  = q->curr;
	next = buf;
	dprintk("buffer_requeue\n");

	if (!buf)
		return 0;

	dprintk("buffer_requeue : resending active buffers \n");

	if (!list_empty(&q->queue))
		next = list_entry(q->queue.next, struct saa7134_buf,
					  vb.queue);
	buf->activate(dev, buf, next);

	return 0;
}

/* ------------------------------------------------------------------ */

int saa7134_set_dmabits(struct saa7134_dev *dev)
{
	u32 split, task=0, ctrl=0, irq=0;
	enum v4l2_field cap = V4L2_FIELD_ANY;
	enum v4l2_field ov  = V4L2_FIELD_ANY;

	assert_spin_locked(&dev->slock);

	if (dev->insuspend)
		return 0;

	/* video capture -- dma 0 + video task A */
	if (dev->video_q.curr) {
		task |= 0x01;
		ctrl |= SAA7134_MAIN_CTRL_TE0;
		irq  |= SAA7134_IRQ1_INTE_RA0_1 |
			SAA7134_IRQ1_INTE_RA0_0;
		cap = dev->video_q.curr->vb.field;
	}

	/* video capture -- dma 1+2 (planar modes) */
	if (dev->video_q.curr &&
	    dev->video_q.curr->fmt->planar) {
		ctrl |= SAA7134_MAIN_CTRL_TE4 |