cx88-mpeg.c

linux 内核源代码

/*
 *
 *  Support for the mpeg transport stream transfers
 *  PCI function #2 of the cx2388x.
 *
 *    (c) 2004 Jelle Foks <[e-mail]>
 *    (c) 2004 Chris Pascoe <[e-mail]>
 *    (c) 2004 Gerd Knorr <[e-mail]>
 *
 *  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/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <asm/delay.h>

#include "cx88.h"

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

MODULE_DESCRIPTION("mpeg driver for cx2388x based TV cards");
MODULE_AUTHOR("Jelle Foks <[e-mail]>");
MODULE_AUTHOR("Chris Pascoe <[e-mail]>");
MODULE_AUTHOR("Gerd Knorr <[e-mail]> [SuSE Labs]");
MODULE_LICENSE("GPL");

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

#define dprintk(level,fmt, arg...)	if (debug >= level) \
	printk(KERN_DEBUG "%s/2-mpeg: " fmt, dev->core->name, ## arg)

#define mpeg_dbg(level,fmt, arg...)	if (debug >= level) \
	printk(KERN_DEBUG "%s/2-mpeg: " fmt, core->name, ## arg)

#if defined(CONFIG_MODULES) && defined(MODULE)
static void request_module_async(struct work_struct *work)
{
	struct cx8802_dev *dev=container_of(work, struct cx8802_dev, request_module_wk);

	if (dev->core->board.mpeg & CX88_MPEG_DVB)
		request_module("cx88-dvb");
	if (dev->core->board.mpeg & CX88_MPEG_BLACKBIRD)
		request_module("cx88-blackbird");
}

static void request_modules(struct cx8802_dev *dev)
{
	INIT_WORK(&dev->request_module_wk, request_module_async);
	schedule_work(&dev->request_module_wk);
}
#else
#define request_modules(dev)
#endif /* CONFIG_MODULES */


static LIST_HEAD(cx8802_devlist);
/* ------------------------------------------------------------------ */

static int cx8802_start_dma(struct cx8802_dev    *dev,
			    struct cx88_dmaqueue *q,
			    struct cx88_buffer   *buf)
{
	struct cx88_core *core = dev->core;

	dprintk(1, "cx8802_start_dma w: %d, h: %d, f: %d\n",
		buf->vb.width, buf->vb.height, buf->vb.field);

	/* setup fifo + format */
	cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH28],
				dev->ts_packet_size, buf->risc.dma);

	/* write TS length to chip */
	cx_write(MO_TS_LNGTH, buf->vb.width);

	/* FIXME: this needs a review.
	 * also: move to cx88-blackbird + cx88-dvb source files? */

	dprintk( 1, "core->active_type_id = 0x%08x\n", core->active_type_id);

	if ( (core->active_type_id == CX88_MPEG_DVB) &&
		(core->board.mpeg & CX88_MPEG_DVB) ) {

		dprintk( 1, "cx8802_start_dma doing .dvb\n");
		/* negedge driven & software reset */
		cx_write(TS_GEN_CNTRL, 0x0040 | dev->ts_gen_cntrl);
		udelay(100);
		cx_write(MO_PINMUX_IO, 0x00);
		cx_write(TS_HW_SOP_CNTRL,0x47<<16|188<<4|0x01);
		switch (core->boardnr) {
		case CX88_BOARD_DVICO_FUSIONHDTV_3_GOLD_Q:
		case CX88_BOARD_DVICO_FUSIONHDTV_3_GOLD_T:
		case CX88_BOARD_DVICO_FUSIONHDTV_5_GOLD:
		case CX88_BOARD_PCHDTV_HD5500:
			cx_write(TS_SOP_STAT, 1<<13);
			break;
		case CX88_BOARD_HAUPPAUGE_NOVASPLUS_S1:
		case CX88_BOARD_HAUPPAUGE_NOVASE2_S1:
			cx_write(MO_PINMUX_IO, 0x88); /* Enable MPEG parallel IO and video signal pins */
			udelay(100);
			break;
		case CX88_BOARD_HAUPPAUGE_HVR1300:
			break;
		default:
			cx_write(TS_SOP_STAT, 0x00);
			break;
		}
		cx_write(TS_GEN_CNTRL, dev->ts_gen_cntrl);
		udelay(100);
	} else if ( (core->active_type_id == CX88_MPEG_BLACKBIRD) &&
		(core->board.mpeg & CX88_MPEG_BLACKBIRD) ) {
		dprintk( 1, "cx8802_start_dma doing .blackbird\n");
		cx_write(MO_PINMUX_IO, 0x88); /* enable MPEG parallel IO */

		cx_write(TS_GEN_CNTRL, 0x46); /* punctured clock TS & posedge driven & software reset */
		udelay(100);

		cx_write(TS_HW_SOP_CNTRL, 0x408); /* mpeg start byte */
		cx_write(TS_VALERR_CNTRL, 0x2000);

		cx_write(TS_GEN_CNTRL, 0x06); /* punctured clock TS & posedge driven */
		udelay(100);
	} else {
		printk( "%s() Failed. Unsupported value in .mpeg (0x%08x)\n", __FUNCTION__,
			core->board.mpeg );
		return -EINVAL;
	}

	/* reset counter */
	cx_write(MO_TS_GPCNTRL, GP_COUNT_CONTROL_RESET);
	q->count = 1;

	/* enable irqs */
	dprintk( 1, "setting the interrupt mask\n" );
	cx_set(MO_PCI_INTMSK, core->pci_irqmask | PCI_INT_TSINT);
	cx_set(MO_TS_INTMSK,  0x1f0011);

	/* start dma */
	cx_set(MO_DEV_CNTRL2, (1<<5));
	cx_set(MO_TS_DMACNTRL, 0x11);
	return 0;
}

static int cx8802_stop_dma(struct cx8802_dev *dev)
{
	struct cx88_core *core = dev->core;
	dprintk( 1, "cx8802_stop_dma\n" );

	/* stop dma */
	cx_clear(MO_TS_DMACNTRL, 0x11);

	/* disable irqs */
	cx_clear(MO_PCI_INTMSK, PCI_INT_TSINT);
	cx_clear(MO_TS_INTMSK, 0x1f0011);

	/* Reset the controller */
	cx_write(TS_GEN_CNTRL, 0xcd);
	return 0;
}

static int cx8802_restart_queue(struct cx8802_dev    *dev,
				struct cx88_dmaqueue *q)
{
	struct cx88_buffer *buf;

	dprintk( 1, "cx8802_restart_queue\n" );
	if (list_empty(&q->active))
	{
		struct cx88_buffer *prev;
		prev = NULL;

		dprintk(1, "cx8802_restart_queue: queue is empty\n" );

		for (;;) {
			if (list_empty(&q->queued))
				return 0;
			buf = list_entry(q->queued.next, struct cx88_buffer, vb.queue);
			if (NULL == prev) {
				list_del(&buf->vb.queue);
				list_add_tail(&buf->vb.queue,&q->active);
				cx8802_start_dma(dev, q, buf);
				buf->vb.state = STATE_ACTIVE;
				buf->count    = q->count++;
				mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
				dprintk(1,"[%p/%d] restart_queue - first active\n",
					buf,buf->vb.i);

			} else if (prev->vb.width  == buf->vb.width  &&
				   prev->vb.height == buf->vb.height &&
				   prev->fmt       == buf->fmt) {
				list_del(&buf->vb.queue);
				list_add_tail(&buf->vb.queue,&q->active);
				buf->vb.state = STATE_ACTIVE;
				buf->count    = q->count++;
				prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
				dprintk(1,"[%p/%d] restart_queue - move to active\n",
					buf,buf->vb.i);
			} else {
				return 0;
			}
			prev = buf;
		}
		return 0;
	}

	buf = list_entry(q->active.next, struct cx88_buffer, vb.queue);
	dprintk(2,"restart_queue [%p/%d]: restart dma\n",
		buf, buf->vb.i);
	cx8802_start_dma(dev, q, buf);
	list_for_each_entry(buf, &q->active, vb.queue)
		buf->count = q->count++;
	mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
	return 0;
}

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

int cx8802_buf_prepare(struct videobuf_queue *q, struct cx8802_dev *dev,
			struct cx88_buffer *buf, enum v4l2_field field)
{
	int size = dev->ts_packet_size * dev->ts_packet_count;
	struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
	int rc;

	dprintk(1, "%s: %p\n", __FUNCTION__, buf);
	if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
		return -EINVAL;

	if (STATE_NEEDS_INIT == buf->vb.state) {
		buf->vb.width  = dev->ts_packet_size;
		buf->vb.height = dev->ts_packet_count;
		buf->vb.size   = size;
		buf->vb.field  = field /*V4L2_FIELD_TOP*/;

		if (0 != (rc = videobuf_iolock(q,&buf->vb,NULL)))
			goto fail;
		cx88_risc_databuffer(dev->pci, &buf->risc,
				     dma->sglist,
				     buf->vb.width, buf->vb.height, 0);
	}
	buf->vb.state = STATE_PREPARED;
	return 0;

 fail:
	cx88_free_buffer(q,buf);
	return rc;
}

void cx8802_buf_queue(struct cx8802_dev *dev, struct cx88_buffer *buf)
{
	struct cx88_buffer    *prev;
	struct cx88_dmaqueue  *cx88q = &dev->mpegq;

	dprintk( 1, "cx8802_buf_queue\n" );
	/* add jump to stopper */
	buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
	buf->risc.jmp[1] = cpu_to_le32(cx88q->stopper.dma);

	if (list_empty(&cx88q->active)) {
		dprintk( 1, "queue is empty - first active\n" );
		list_add_tail(&buf->vb.queue,&cx88q->active);
		cx8802_start_dma(dev, cx88q, buf);
		buf->vb.state = STATE_ACTIVE;
		buf->count    = cx88q->count++;
		mod_timer(&cx88q->timeout, jiffies+BUFFER_TIMEOUT);
		dprintk(1,"[%p/%d] %s - first active\n",
			buf, buf->vb.i, __FUNCTION__);

	} else {
		dprintk( 1, "queue is not empty - append to active\n" );
		prev = list_entry(cx88q->active.prev, struct cx88_buffer, vb.queue);
		list_add_tail(&buf->vb.queue,&cx88q->active);
		buf->vb.state = STATE_ACTIVE;
		buf->count    = cx88q->count++;
		prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
		dprintk( 1, "[%p/%d] %s - append to active\n",
			buf, buf->vb.i, __FUNCTION__);
	}
}

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

static void do_cancel_buffers(struct cx8802_dev *dev, char *reason, int restart)
{
	struct cx88_dmaqueue *q = &dev->mpegq;
	struct cx88_buffer *buf;
	unsigned long flags;

	spin_lock_irqsave(&dev->slock,flags);
	while (!list_empty(&q->active)) {
		buf = list_entry(q->active.next, struct cx88_buffer, vb.queue);
		list_del(&buf->vb.queue);
		buf->vb.state = STATE_ERROR;
		wake_up(&buf->vb.done);
		dprintk(1,"[%p/%d] %s - dma=0x%08lx\n",
			buf, buf->vb.i, reason, (unsigned long)buf->risc.dma);
	}
	if (restart)
	{
		dprintk(1, "restarting queue\n" );
		cx8802_restart_queue(dev,q);
	}
	spin_unlock_irqrestore(&dev->slock,flags);
}

void cx8802_cancel_buffers(struct cx8802_dev *dev)
{
	struct cx88_dmaqueue *q = &dev->mpegq;

	dprintk( 1, "cx8802_cancel_buffers" );
	del_timer_sync(&q->timeout);
	cx8802_stop_dma(dev);
	do_cancel_buffers(dev,"cancel",0);
}

static void cx8802_timeout(unsigned long data)
{
	struct cx8802_dev *dev = (struct cx8802_dev*)data;

	dprintk(1, "%s\n",__FUNCTION__);

	if (debug)
		cx88_sram_channel_dump(dev->core, &cx88_sram_channels[SRAM_CH28]);
	cx8802_stop_dma(dev);
	do_cancel_buffers(dev,"timeout",1);
}

static char *cx88_mpeg_irqs[32] = {
	"ts_risci1", NULL, NULL, NULL,
	"ts_risci2", NULL, NULL, NULL,
	"ts_oflow",  NULL, NULL, NULL,
	"ts_sync",   NULL, NULL, NULL,
	"opc_err", "par_err", "rip_err", "pci_abort",
	"ts_err?",
};

static void cx8802_mpeg_irq(struct cx8802_dev *dev)
{
	struct cx88_core *core = dev->core;
	u32 status, mask, count;

	dprintk( 1, "cx8802_mpeg_irq\n" );
	status = cx_read(MO_TS_INTSTAT);
	mask   = cx_read(MO_TS_INTMSK);
	if (0 == (status & mask))
		return;

	cx_write(MO_TS_INTSTAT, status);

	if (debug || (status & mask & ~0xff))
		cx88_print_irqbits(core->name, "irq mpeg ",
				   cx88_mpeg_irqs, ARRAY_SIZE(cx88_mpeg_irqs),
				   status, mask);

	/* risc op code error */
	if (status & (1 << 16)) {
		printk(KERN_WARNING "%s: mpeg risc op code error\n",core->name);
		cx_clear(MO_TS_DMACNTRL, 0x11);
		cx88_sram_channel_dump(dev->core, &cx88_sram_channels[SRAM_CH28]);
	}

	/* risc1 y */
	if (status & 0x01) {
		dprintk( 1, "wake up\n" );
		spin_lock(&dev->slock);
		count = cx_read(MO_TS_GPCNT);
		cx88_wakeup(dev->core, &dev->mpegq, count);
		spin_unlock(&dev->slock);
	}

	/* risc2 y */
	if (status & 0x10) {
		spin_lock(&dev->slock);
		cx8802_restart_queue(dev,&dev->mpegq);
		spin_unlock(&dev->slock);
	}

	/* other general errors */
	if (status & 0x1f0100) {
		dprintk( 0, "general errors: 0x%08x\n", status & 0x1f0100 );
		spin_lock(&dev->slock);
		cx8802_stop_dma(dev);
		cx8802_restart_queue(dev,&dev->mpegq);
		spin_unlock(&dev->slock);
	}
}

#define MAX_IRQ_LOOP 10

static irqreturn_t cx8802_irq(int irq, void *dev_id)
{
	struct cx8802_dev *dev = dev_id;
	struct cx88_core *core = dev->core;
	u32 status;
	int loop, handled = 0;

	for (loop = 0; loop < MAX_IRQ_LOOP; loop++) {
		status = cx_read(MO_PCI_INTSTAT) &
			(core->pci_irqmask | PCI_INT_TSINT);
		if (0 == status)
			goto out;
		dprintk( 1, "cx8802_irq\n" );
		dprintk( 1, "    loop: %d/%d\n", loop, MAX_IRQ_LOOP );
		dprintk( 1, "    status: %d\n", status );
		handled = 1;
		cx_write(MO_PCI_INTSTAT, status);

		if (status & core->pci_irqmask)
			cx88_core_irq(core,status);
		if (status & PCI_INT_TSINT)
			cx8802_mpeg_irq(dev);
	};
	if (MAX_IRQ_LOOP == loop) {
		dprintk( 0, "clearing mask\n" );
		printk(KERN_WARNING "%s/0: irq loop -- clearing mask\n",
		       core->name);
		cx_write(MO_PCI_INTMSK,0);
	}

 out:
	return IRQ_RETVAL(handled);
}

/* ----------------------------------------------------------- */
/* exported stuff                                              */

int cx8802_init_common(struct cx8802_dev *dev)
{
	struct cx88_core *core = dev->core;