[deliverable/linux.git] / drivers / media / common / saa7146_core.c

/*
    saa7146.o - driver for generic saa7146-based hardware

    Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>

    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 <media/saa7146.h>

LIST_HEAD(saa7146_devices);
DEFINE_MUTEX(saa7146_devices_lock);

static int saa7146_num;

unsigned int saa7146_debug;

module_param(saa7146_debug, uint, 0644);
MODULE_PARM_DESC(saa7146_debug, "debug level (default: 0)");

#if 0
static void dump_registers(struct saa7146_dev* dev)
{
	int i = 0;

	INFO((" @ %li jiffies:\n",jiffies));
	for(i = 0; i <= 0x148; i+=4) {
		printk("0x%03x: 0x%08x\n",i,saa7146_read(dev,i));
	}
}
#endif

/****************************************************************************
 * gpio and debi helper functions
 ****************************************************************************/

void saa7146_setgpio(struct saa7146_dev *dev, int port, u32 data)
{
	u32 value = 0;

	BUG_ON(port > 3);

	value = saa7146_read(dev, GPIO_CTRL);
	value &= ~(0xff << (8*port));
	value |= (data << (8*port));
	saa7146_write(dev, GPIO_CTRL, value);
}

/* This DEBI code is based on the saa7146 Stradis driver by Nathan Laredo */
static inline int saa7146_wait_for_debi_done_sleep(struct saa7146_dev *dev,
				unsigned long us1, unsigned long us2)
{
	unsigned long timeout;
	int err;

	/* wait for registers to be programmed */
	timeout = jiffies + usecs_to_jiffies(us1);
	while (1) {
		err = time_after(jiffies, timeout);
		if (saa7146_read(dev, MC2) & 2)
			break;
		if (err) {
			printk(KERN_ERR "%s: %s timed out while waiting for "
					"registers getting programmed\n",
					dev->name, __FUNCTION__);
			return -ETIMEDOUT;
		}
		msleep(1);
	}

	/* wait for transfer to complete */
	timeout = jiffies + usecs_to_jiffies(us2);
	while (1) {
		err = time_after(jiffies, timeout);
		if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
			break;
		saa7146_read(dev, MC2);
		if (err) {
			DEB_S(("%s: %s timed out while waiting for transfer "
				"completion\n",	dev->name, __FUNCTION__));
			return -ETIMEDOUT;
		}
		msleep(1);
	}

	return 0;
}

static inline int saa7146_wait_for_debi_done_busyloop(struct saa7146_dev *dev,
				unsigned long us1, unsigned long us2)
{
	unsigned long loops;

	/* wait for registers to be programmed */
	loops = us1;
	while (1) {
		if (saa7146_read(dev, MC2) & 2)
			break;
		if (!loops--) {
			printk(KERN_ERR "%s: %s timed out while waiting for "
					"registers getting programmed\n",
					dev->name, __FUNCTION__);
			return -ETIMEDOUT;
		}
		udelay(1);
	}

	/* wait for transfer to complete */
	loops = us2 / 5;
	while (1) {
		if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
			break;
		saa7146_read(dev, MC2);
		if (!loops--) {
			DEB_S(("%s: %s timed out while waiting for transfer "
				"completion\n", dev->name, __FUNCTION__));
			return -ETIMEDOUT;
		}
		udelay(5);
	}

	return 0;
}

int saa7146_wait_for_debi_done(struct saa7146_dev *dev, int nobusyloop)
{
	if (nobusyloop)
		return saa7146_wait_for_debi_done_sleep(dev, 50000, 250000);
	else
		return saa7146_wait_for_debi_done_busyloop(dev, 50000, 250000);
}

/****************************************************************************
 * general helper functions
 ****************************************************************************/

/* this is videobuf_vmalloc_to_sg() from videobuf-dma-sg.c
   make sure virt has been allocated with vmalloc_32(), otherwise the BUG()
   may be triggered on highmem machines */
static struct scatterlist* vmalloc_to_sg(unsigned char *virt, int nr_pages)
{
	struct scatterlist *sglist;
	struct page *pg;
	int i;

	sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
	if (NULL == sglist)
		return NULL;
	sg_init_table(sglist, nr_pages);
	for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
		pg = vmalloc_to_page(virt);
		if (NULL == pg)
			goto err;
		BUG_ON(PageHighMem(pg));
		sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);
	}
	return sglist;

 err:
	kfree(sglist);
	return NULL;
}

/********************************************************************************/
/* common page table functions */

void *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa7146_pgtable *pt)
{
	int pages = (length+PAGE_SIZE-1)/PAGE_SIZE;
	void *mem = vmalloc_32(length);
	int slen = 0;

	if (NULL == mem)
		goto err_null;

	if (!(pt->slist = vmalloc_to_sg(mem, pages)))
		goto err_free_mem;

	if (saa7146_pgtable_alloc(pci, pt))
		goto err_free_slist;

	pt->nents = pages;
	slen = pci_map_sg(pci,pt->slist,pt->nents,PCI_DMA_FROMDEVICE);
	if (0 == slen)
		goto err_free_pgtable;

	if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen))
		goto err_unmap_sg;

	return mem;

err_unmap_sg:
	pci_unmap_sg(pci, pt->slist, pt->nents, PCI_DMA_FROMDEVICE);
err_free_pgtable:
	saa7146_pgtable_free(pci, pt);
err_free_slist:
	kfree(pt->slist);
	pt->slist = NULL;
err_free_mem:
	vfree(mem);
err_null:
	return NULL;
}

void saa7146_vfree_destroy_pgtable(struct pci_dev *pci, void *mem, struct saa7146_pgtable *pt)
{
	pci_unmap_sg(pci, pt->slist, pt->nents, PCI_DMA_FROMDEVICE);
	saa7146_pgtable_free(pci, pt);
	kfree(pt->slist);
	pt->slist = NULL;
	vfree(mem);
}

void saa7146_pgtable_free(struct pci_dev *pci, struct saa7146_pgtable *pt)
{
	if (NULL == pt->cpu)
		return;
	pci_free_consistent(pci, pt->size, pt->cpu, pt->dma);
	pt->cpu = NULL;
}

int saa7146_pgtable_alloc(struct pci_dev *pci, struct saa7146_pgtable *pt)
{
	u32          *cpu;
	dma_addr_t   dma_addr;

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

	return 0;
}

int saa7146_pgtable_build_single(struct pci_dev *pci, struct saa7146_pgtable *pt,
	struct scatterlist *list, int sglen  )
{
	u32 *ptr, fill;
	int nr_pages = 0;
	int i,p;

	BUG_ON(0 == sglen);
	BUG_ON(list->offset > PAGE_SIZE);

	/* if we have a user buffer, the first page may not be
	   aligned to a page boundary. */
	pt->offset = list->offset;

	ptr = pt->cpu;
	for (i = 0; i < sglen; i++, list++) {
/*
		printk("i:%d, adr:0x%08x, len:%d, offset:%d\n", i,sg_dma_address(list), sg_dma_len(list), list->offset);
*/
		for (p = 0; p * 4096 < list->length; p++, ptr++) {
			*ptr = cpu_to_le32(sg_dma_address(list) + p * 4096);
			nr_pages++;
		}
	}


	/* safety; fill the page table up with the last valid page */
	fill = *(ptr-1);
	for(i=nr_pages;i<1024;i++) {
		*ptr++ = fill;
	}

/*
	ptr = pt->cpu;
	printk("offset: %d\n",pt->offset);
	for(i=0;i<5;i++) {
		printk("ptr1 %d: 0x%08x\n",i,ptr[i]);
	}
*/
	return 0;
}

/********************************************************************************/
/* interrupt handler */
static irqreturn_t interrupt_hw(int irq, void *dev_id)
{
	struct saa7146_dev *dev = dev_id;
	u32 isr;
	u32 ack_isr;

	/* read out the interrupt status register */
	ack_isr = isr = saa7146_read(dev, ISR);

	/* is this our interrupt? */
	if ( 0 == isr ) {
		/* nope, some other device */
		return IRQ_NONE;
	}

	if( 0 != (dev->ext)) {
		if( 0 != (dev->ext->irq_mask & isr )) {
			if( 0 != dev->ext->irq_func ) {
				dev->ext->irq_func(dev, &isr);
			}
			isr &= ~dev->ext->irq_mask;
		}
	}
	if (0 != (isr & (MASK_27))) {
		DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
		if( 0 != dev->vv_data && 0 != dev->vv_callback) {
			dev->vv_callback(dev,isr);
		}
		isr &= ~MASK_27;
	}
	if (0 != (isr & (MASK_28))) {
		if( 0 != dev->vv_data && 0 != dev->vv_callback) {
			dev->vv_callback(dev,isr);
		}
		isr &= ~MASK_28;
	}
	if (0 != (isr & (MASK_16|MASK_17))) {
		SAA7146_IER_DISABLE(dev, MASK_16|MASK_17);
		/* only wake up if we expect something */
		if (0 != dev->i2c_op) {
			dev->i2c_op = 0;
			wake_up(&dev->i2c_wq);
		} else {
			u32 psr = saa7146_read(dev, PSR);
			u32 ssr = saa7146_read(dev, SSR);
			printk(KERN_WARNING "%s: unexpected i2c irq: isr %08x psr %08x ssr %08x\n",
			       dev->name, isr, psr, ssr);
		}
		isr &= ~(MASK_16|MASK_17);
	}
	if( 0 != isr ) {
		ERR(("warning: interrupt enabled, but not handled properly.(0x%08x)\n",isr));
		ERR(("disabling interrupt source(s)!\n"));
		SAA7146_IER_DISABLE(dev,isr);
	}
	saa7146_write(dev, ISR, ack_isr);
	return IRQ_HANDLED;
}

/*********************************************************************************/
/* configuration-functions                                                       */

static int saa7146_init_one(struct pci_dev *pci, const struct pci_device_id *ent)
{
	struct saa7146_pci_extension_data *pci_ext = (struct saa7146_pci_extension_data *)ent->driver_data;
	struct saa7146_extension *ext = pci_ext->ext;
	struct saa7146_dev *dev;
	int err = -ENOMEM;

	/* clear out mem for sure */
	dev = kzalloc(sizeof(struct saa7146_dev), GFP_KERNEL);
	if (!dev) {
		ERR(("out of memory.\n"));
		goto out;
	}

	DEB_EE(("pci:%p\n",pci));

	err = pci_enable_device(pci);
	if (err < 0) {
		ERR(("pci_enable_device() failed.\n"));
		goto err_free;
	}

	/* enable bus-mastering */
	pci_set_master(pci);

	dev->pci = pci;

	/* get chip-revision; this is needed to enable bug-fixes */
	err = pci_read_config_dword(pci, PCI_CLASS_REVISION, &dev->revision);
	if (err < 0) {
		ERR(("pci_read_config_dword() failed.\n"));
		goto err_disable;
	}
	dev->revision &= 0xf;

	/* remap the memory from virtual to physical address */

	err = pci_request_region(pci, 0, "saa7146");
	if (err < 0)
		goto err_disable;

	dev->mem = ioremap(pci_resource_start(pci, 0),
			   pci_resource_len(pci, 0));
	if (!dev->mem) {
		ERR(("ioremap() failed.\n"));
		err = -ENODEV;
		goto err_release;
	}

	/* we don't do a master reset here anymore, it screws up
	   some boards that don't have an i2c-eeprom for configuration
	   values */
/*
	saa7146_write(dev, MC1, MASK_31);
*/

	/* disable all irqs */
	saa7146_write(dev, IER, 0);

	/* shut down all dma transfers and rps tasks */
	saa7146_write(dev, MC1, 0x30ff0000);

	/* clear out any rps-signals pending */
	saa7146_write(dev, MC2, 0xf8000000);

	/* request an interrupt for the saa7146 */
	err = request_irq(pci->irq, interrupt_hw, IRQF_SHARED | IRQF_DISABLED,
			  dev->name, dev);
	if (err < 0) {
		ERR(("request_irq() failed.\n"));
		goto err_unmap;
	}

	err = -ENOMEM;

	/* get memory for various stuff */
	dev->d_rps0.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
						    &dev->d_rps0.dma_handle);
	if (!dev->d_rps0.cpu_addr)
		goto err_free_irq;
	memset(dev->d_rps0.cpu_addr, 0x0, SAA7146_RPS_MEM);

	dev->d_rps1.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
						    &dev->d_rps1.dma_handle);
	if (!dev->d_rps1.cpu_addr)
		goto err_free_rps0;
	memset(dev->d_rps1.cpu_addr, 0x0, SAA7146_RPS_MEM);

	dev->d_i2c.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
						   &dev->d_i2c.dma_handle);
	if (!dev->d_i2c.cpu_addr)
		goto err_free_rps1;
	memset(dev->d_i2c.cpu_addr, 0x0, SAA7146_RPS_MEM);

	/* the rest + print status message */

	/* create a nice device name */
	sprintf(dev->name, "saa7146 (%d)", saa7146_num);

	INFO(("found saa7146 @ mem %p (revision %d, irq %d) (0x%04x,0x%04x).\n", dev->mem, dev->revision, pci->irq, pci->subsystem_vendor, pci->subsystem_device));
	dev->ext = ext;

	pci_set_drvdata(pci, dev);

	mutex_init(&dev->lock);
	spin_lock_init(&dev->int_slock);
	spin_lock_init(&dev->slock);

	mutex_init(&dev->i2c_lock);

	dev->module = THIS_MODULE;
	init_waitqueue_head(&dev->i2c_wq);

	/* set some sane pci arbitrition values */
	saa7146_write(dev, PCI_BT_V1, 0x1c00101f);

	/* TODO: use the status code of the callback */

	err = -ENODEV;

	if (ext->probe && ext->probe(dev)) {
		DEB_D(("ext->probe() failed for %p. skipping device.\n",dev));
		goto err_free_i2c;
	}

	if (ext->attach(dev, pci_ext)) {
		DEB_D(("ext->attach() failed for %p. skipping device.\n",dev));
		goto err_unprobe;
	}

	INIT_LIST_HEAD(&dev->item);
	list_add_tail(&dev->item,&saa7146_devices);
	saa7146_num++;

	err = 0;
out:
	return err;

err_unprobe:
	pci_set_drvdata(pci, NULL);
err_free_i2c:
	pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_i2c.cpu_addr,
			    dev->d_i2c.dma_handle);
err_free_rps1:
	pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps1.cpu_addr,
			    dev->d_rps1.dma_handle);
err_free_rps0:
	pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps0.cpu_addr,
			    dev->d_rps0.dma_handle);
err_free_irq:
	free_irq(pci->irq, (void *)dev);
err_unmap:
	iounmap(dev->mem);
err_release:
	pci_release_region(pci, 0);
err_disable:
	pci_disable_device(pci);
err_free:
	kfree(dev);
	goto out;
}

static void saa7146_remove_one(struct pci_dev *pdev)
{
	struct saa7146_dev* dev = pci_get_drvdata(pdev);
	struct {
		void *addr;
		dma_addr_t dma;
	} dev_map[] = {
		{ dev->d_i2c.cpu_addr, dev->d_i2c.dma_handle },
		{ dev->d_rps1.cpu_addr, dev->d_rps1.dma_handle },
		{ dev->d_rps0.cpu_addr, dev->d_rps0.dma_handle },
		{ NULL, 0 }
	}, *p;

	DEB_EE(("dev:%p\n",dev));

	dev->ext->detach(dev);

	/* shut down all video dma transfers */
	saa7146_write(dev, MC1, 0x00ff0000);

	/* disable all irqs, release irq-routine */
	saa7146_write(dev, IER, 0);

	free_irq(pdev->irq, dev);

	for (p = dev_map; p->addr; p++)
		pci_free_consistent(pdev, SAA7146_RPS_MEM, p->addr, p->dma);

	iounmap(dev->mem);
	pci_release_region(pdev, 0);
	list_del(&dev->item);
	pci_disable_device(pdev);
	kfree(dev);

	saa7146_num--;
}

/*********************************************************************************/
/* extension handling functions                                                  */

int saa7146_register_extension(struct saa7146_extension* ext)
{
	DEB_EE(("ext:%p\n",ext));

	ext->driver.name = ext->name;
	ext->driver.id_table = ext->pci_tbl;
	ext->driver.probe = saa7146_init_one;
	ext->driver.remove = saa7146_remove_one;

	printk("saa7146: register extension '%s'.\n",ext->name);
	return pci_register_driver(&ext->driver);
}

int saa7146_unregister_extension(struct saa7146_extension* ext)
{
	DEB_EE(("ext:%p\n",ext));
	printk("saa7146: unregister extension '%s'.\n",ext->name);
	pci_unregister_driver(&ext->driver);
	return 0;
}

EXPORT_SYMBOL_GPL(saa7146_register_extension);
EXPORT_SYMBOL_GPL(saa7146_unregister_extension);

/* misc functions used by extension modules */
EXPORT_SYMBOL_GPL(saa7146_pgtable_alloc);
EXPORT_SYMBOL_GPL(saa7146_pgtable_free);
EXPORT_SYMBOL_GPL(saa7146_pgtable_build_single);
EXPORT_SYMBOL_GPL(saa7146_vmalloc_build_pgtable);
EXPORT_SYMBOL_GPL(saa7146_vfree_destroy_pgtable);
EXPORT_SYMBOL_GPL(saa7146_wait_for_debi_done);

EXPORT_SYMBOL_GPL(saa7146_setgpio);

EXPORT_SYMBOL_GPL(saa7146_i2c_adapter_prepare);

EXPORT_SYMBOL_GPL(saa7146_debug);
EXPORT_SYMBOL_GPL(saa7146_devices);
EXPORT_SYMBOL_GPL(saa7146_devices_lock);

MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
MODULE_DESCRIPTION("driver for generic saa7146-based hardware");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	saa7146.o - driver for generic saa7146-based hardware
	3
	4	Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
	5
	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2 of the License, or
	9	(at your option) any later version.
	10
	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with this program; if not, write to the Free Software
	18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	19	*/
	20
	21	#include <media/saa7146.h>
	22
	23	LIST_HEAD(saa7146_devices);
3593cab5	24	DEFINE_MUTEX(saa7146_devices_lock);
1da177e4	25
c2c62d81	26	static int saa7146_num;
1da177e4	27
c2c62d81	28	unsigned int saa7146_debug;
1da177e4	29
804b4458	30	module_param(saa7146_debug, uint, 0644);
1da177e4 LT	31	MODULE_PARM_DESC(saa7146_debug, "debug level (default: 0)");
	32
	33	#if 0
	34	static void dump_registers(struct saa7146_dev* dev)
	35	{
	36	int i = 0;
	37
	38	INFO((" @ %li jiffies:\n",jiffies));
	39	for(i = 0; i <= 0x148; i+=4) {
	40	printk("0x%03x: 0x%08x\n",i,saa7146_read(dev,i));
	41	}
	42	}
	43	#endif
	44
	45	/****************************************************************************
	46	* gpio and debi helper functions
	47	****************************************************************************/
	48
	49	void saa7146_setgpio(struct saa7146_dev *dev, int port, u32 data)
	50	{
	51	u32 value = 0;
	52
	53	BUG_ON(port > 3);
	54
	55	value = saa7146_read(dev, GPIO_CTRL);
	56	value &= ~(0xff << (8*port));
	57	value \|= (data << (8*port));
	58	saa7146_write(dev, GPIO_CTRL, value);
	59	}
	60
	61	/* This DEBI code is based on the saa7146 Stradis driver by Nathan Laredo */
26ac14e2 OE	62	static inline int saa7146_wait_for_debi_done_sleep(struct saa7146_dev *dev,
26ac14e2 OE	63	unsigned long us1, unsigned long us2)
1da177e4	64	{
26ac14e2	65	unsigned long timeout;
25de1926	66	int err;
1da177e4 LT	67
1da177e4 LT	68	/* wait for registers to be programmed */
26ac14e2	69	timeout = jiffies + usecs_to_jiffies(us1);
1da177e4	70	while (1) {
26ac14e2	71	err = time_after(jiffies, timeout);
25de1926 OE	72	if (saa7146_read(dev, MC2) & 2)
	73	break;
	74	if (err) {
26ac14e2 OE	75	printk(KERN_ERR "%s: %s timed out while waiting for "
	76	"registers getting programmed\n",
	77	dev->name, __FUNCTION__);
1da177e4 LT	78	return -ETIMEDOUT;
1da177e4 LT	79	}
26ac14e2	80	msleep(1);
1da177e4 LT	81	}
	82
	83	/* wait for transfer to complete */
26ac14e2	84	timeout = jiffies + usecs_to_jiffies(us2);
1da177e4	85	while (1) {
26ac14e2	86	err = time_after(jiffies, timeout);
1da177e4 LT	87	if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
	88	break;
	89	saa7146_read(dev, MC2);
25de1926	90	if (err) {
26ac14e2 OE	91	DEB_S(("%s: %s timed out while waiting for transfer "
26ac14e2 OE	92	"completion\n", dev->name, __FUNCTION__));
1da177e4 LT	93	return -ETIMEDOUT;
1da177e4 LT	94	}
26ac14e2	95	msleep(1);
1da177e4 LT	96	}
	97
	98	return 0;
	99	}
	100
26ac14e2 OE	101	static inline int saa7146_wait_for_debi_done_busyloop(struct saa7146_dev *dev,
	102	unsigned long us1, unsigned long us2)
	103	{
	104	unsigned long loops;
	105
	106	/* wait for registers to be programmed */
	107	loops = us1;
	108	while (1) {
	109	if (saa7146_read(dev, MC2) & 2)
	110	break;
	111	if (!loops--) {
	112	printk(KERN_ERR "%s: %s timed out while waiting for "
	113	"registers getting programmed\n",
	114	dev->name, __FUNCTION__);
	115	return -ETIMEDOUT;
	116	}
	117	udelay(1);
	118	}
	119
	120	/* wait for transfer to complete */
	121	loops = us2 / 5;
	122	while (1) {
	123	if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
	124	break;
	125	saa7146_read(dev, MC2);
	126	if (!loops--) {
	127	DEB_S(("%s: %s timed out while waiting for transfer "
	128	"completion\n", dev->name, __FUNCTION__));
	129	return -ETIMEDOUT;
	130	}
	131	udelay(5);
	132	}
	133
	134	return 0;
	135	}
	136
	137	int saa7146_wait_for_debi_done(struct saa7146_dev *dev, int nobusyloop)
	138	{
	139	if (nobusyloop)
	140	return saa7146_wait_for_debi_done_sleep(dev, 50000, 250000);
	141	else
	142	return saa7146_wait_for_debi_done_busyloop(dev, 50000, 250000);
	143	}
	144
1da177e4 LT	145	/****************************************************************************
	146	* general helper functions
	147	****************************************************************************/
	148
c1accaa2	149	/* this is videobuf_vmalloc_to_sg() from videobuf-dma-sg.c
1da177e4 LT	150	make sure virt has been allocated with vmalloc_32(), otherwise the BUG()
	151	may be triggered on highmem machines */
	152	static struct scatterlist* vmalloc_to_sg(unsigned char *virt, int nr_pages)
	153	{
	154	struct scatterlist *sglist;
	155	struct page *pg;
	156	int i;
	157
7408187d	158	sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
1da177e4 LT	159	if (NULL == sglist)
1da177e4 LT	160	return NULL;
45711f1a	161	sg_init_table(sglist, nr_pages);
1da177e4 LT	162	for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
	163	pg = vmalloc_to_page(virt);
	164	if (NULL == pg)
	165	goto err;
ae24601b	166	BUG_ON(PageHighMem(pg));
642f1490	167	sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);
1da177e4 LT	168	}
	169	return sglist;
	170
	171	err:
	172	kfree(sglist);
	173	return NULL;
	174	}
	175
	176	/********************************************************************************/
	177	/* common page table functions */
	178
804b4458	179	void saa7146_vmalloc_build_pgtable(struct pci_dev pci, long length, struct saa7146_pgtable *pt)
1da177e4 LT	180	{
1da177e4 LT	181	int pages = (length+PAGE_SIZE-1)/PAGE_SIZE;
804b4458	182	void *mem = vmalloc_32(length);
1da177e4 LT	183	int slen = 0;
1da177e4 LT	184
87c3019d JB	185	if (NULL == mem)
87c3019d JB	186	goto err_null;
1da177e4	187
87c3019d JB	188	if (!(pt->slist = vmalloc_to_sg(mem, pages)))
87c3019d JB	189	goto err_free_mem;
1da177e4	190
87c3019d JB	191	if (saa7146_pgtable_alloc(pci, pt))
87c3019d JB	192	goto err_free_slist;
1da177e4	193
87c3019d JB	194	pt->nents = pages;
	195	slen = pci_map_sg(pci,pt->slist,pt->nents,PCI_DMA_FROMDEVICE);
	196	if (0 == slen)
	197	goto err_free_pgtable;
	198
	199	if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen))
	200	goto err_unmap_sg;
1da177e4 LT	201
1da177e4 LT	202	return mem;
87c3019d JB	203
	204	err_unmap_sg:
	205	pci_unmap_sg(pci, pt->slist, pt->nents, PCI_DMA_FROMDEVICE);
	206	err_free_pgtable:
	207	saa7146_pgtable_free(pci, pt);
	208	err_free_slist:
	209	kfree(pt->slist);
	210	pt->slist = NULL;
	211	err_free_mem:
	212	vfree(mem);
	213	err_null:
	214	return NULL;
	215	}
	216
804b4458	217	void saa7146_vfree_destroy_pgtable(struct pci_dev pci, void mem, struct saa7146_pgtable *pt)
87c3019d JB	218	{
	219	pci_unmap_sg(pci, pt->slist, pt->nents, PCI_DMA_FROMDEVICE);
	220	saa7146_pgtable_free(pci, pt);
	221	kfree(pt->slist);
	222	pt->slist = NULL;
	223	vfree(mem);
1da177e4 LT	224	}
	225
	226	void saa7146_pgtable_free(struct pci_dev pci, struct saa7146_pgtable pt)
	227	{
	228	if (NULL == pt->cpu)
	229	return;
	230	pci_free_consistent(pci, pt->size, pt->cpu, pt->dma);
	231	pt->cpu = NULL;
1da177e4 LT	232	}
	233
	234	int saa7146_pgtable_alloc(struct pci_dev pci, struct saa7146_pgtable pt)
	235	{
afd1a0c9 MCC	236	u32 *cpu;
afd1a0c9 MCC	237	dma_addr_t dma_addr;
1da177e4 LT	238
	239	cpu = pci_alloc_consistent(pci, PAGE_SIZE, &dma_addr);
	240	if (NULL == cpu) {
	241	return -ENOMEM;
	242	}
	243	pt->size = PAGE_SIZE;
	244	pt->cpu = cpu;
	245	pt->dma = dma_addr;
	246
	247	return 0;
	248	}
	249
	250	int saa7146_pgtable_build_single(struct pci_dev pci, struct saa7146_pgtable pt,
	251	struct scatterlist *list, int sglen )
	252	{
	253	u32 *ptr, fill;
	254	int nr_pages = 0;
	255	int i,p;
	256
	257	BUG_ON(0 == sglen);
	258	BUG_ON(list->offset > PAGE_SIZE);
	259
	260	/* if we have a user buffer, the first page may not be
	261	aligned to a page boundary. */
	262	pt->offset = list->offset;
	263
	264	ptr = pt->cpu;
	265	for (i = 0; i < sglen; i++, list++) {
	266	/*
	267	printk("i:%d, adr:0x%08x, len:%d, offset:%d\n", i,sg_dma_address(list), sg_dma_len(list), list->offset);
	268	*/
	269	for (p = 0; p * 4096 < list->length; p++, ptr++) {
	270	ptr = cpu_to_le32(sg_dma_address(list) + p 4096);
	271	nr_pages++;
	272	}
	273	}
	274
	275
	276	/* safety; fill the page table up with the last valid page */
	277	fill = *(ptr-1);
	278	for(i=nr_pages;i<1024;i++) {
	279	*ptr++ = fill;
	280	}
	281
	282	/*
	283	ptr = pt->cpu;
	284	printk("offset: %d\n",pt->offset);
	285	for(i=0;i<5;i++) {
	286	printk("ptr1 %d: 0x%08x\n",i,ptr[i]);
	287	}
	288	*/
	289	return 0;
	290	}
	291
	292	/********************************************************************************/
	293	/* interrupt handler */
7d12e780	294	static irqreturn_t interrupt_hw(int irq, void *dev_id)
1da177e4 LT	295	{
1da177e4 LT	296	struct saa7146_dev *dev = dev_id;
276e49a0 OE	297	u32 isr;
276e49a0 OE	298	u32 ack_isr;
1da177e4 LT	299
1da177e4 LT	300	/* read out the interrupt status register */
276e49a0	301	ack_isr = isr = saa7146_read(dev, ISR);
1da177e4 LT	302
	303	/* is this our interrupt? */
	304	if ( 0 == isr ) {
	305	/* nope, some other device */
	306	return IRQ_NONE;
	307	}
	308
1da177e4 LT	309	if( 0 != (dev->ext)) {
	310	if( 0 != (dev->ext->irq_mask & isr )) {
	311	if( 0 != dev->ext->irq_func ) {
	312	dev->ext->irq_func(dev, &isr);
	313	}
	314	isr &= ~dev->ext->irq_mask;
	315	}
	316	}
	317	if (0 != (isr & (MASK_27))) {
	318	DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
	319	if( 0 != dev->vv_data && 0 != dev->vv_callback) {
	320	dev->vv_callback(dev,isr);
	321	}
	322	isr &= ~MASK_27;
	323	}
	324	if (0 != (isr & (MASK_28))) {
	325	if( 0 != dev->vv_data && 0 != dev->vv_callback) {
	326	dev->vv_callback(dev,isr);
	327	}
	328	isr &= ~MASK_28;
	329	}
	330	if (0 != (isr & (MASK_16\|MASK_17))) {
276e49a0 OE	331	SAA7146_IER_DISABLE(dev, MASK_16\|MASK_17);
	332	/* only wake up if we expect something */
	333	if (0 != dev->i2c_op) {
	334	dev->i2c_op = 0;
	335	wake_up(&dev->i2c_wq);
1da177e4	336	} else {
276e49a0 OE	337	u32 psr = saa7146_read(dev, PSR);
	338	u32 ssr = saa7146_read(dev, SSR);
	339	printk(KERN_WARNING "%s: unexpected i2c irq: isr %08x psr %08x ssr %08x\n",
	340	dev->name, isr, psr, ssr);
1da177e4 LT	341	}
	342	isr &= ~(MASK_16\|MASK_17);
	343	}
	344	if( 0 != isr ) {
	345	ERR(("warning: interrupt enabled, but not handled properly.(0x%08x)\n",isr));
	346	ERR(("disabling interrupt source(s)!\n"));
	347	SAA7146_IER_DISABLE(dev,isr);
	348	}
276e49a0	349	saa7146_write(dev, ISR, ack_isr);
1da177e4 LT	350	return IRQ_HANDLED;
	351	}
	352
	353	/*********************************************************************************/
	354	/* configuration-functions */
	355
	356	static int saa7146_init_one(struct pci_dev pci, const struct pci_device_id ent)
	357	{
	358	struct saa7146_pci_extension_data pci_ext = (struct saa7146_pci_extension_data )ent->driver_data;
	359	struct saa7146_extension *ext = pci_ext->ext;
	360	struct saa7146_dev *dev;
	361	int err = -ENOMEM;
	362
7408187d PI	363	/* clear out mem for sure */
7408187d PI	364	dev = kzalloc(sizeof(struct saa7146_dev), GFP_KERNEL);
1da177e4 LT	365	if (!dev) {
	366	ERR(("out of memory.\n"));
	367	goto out;
	368	}
	369
1da177e4 LT	370	DEB_EE(("pci:%p\n",pci));
	371
	372	err = pci_enable_device(pci);
	373	if (err < 0) {
	374	ERR(("pci_enable_device() failed.\n"));
	375	goto err_free;
	376	}
	377
	378	/* enable bus-mastering */
	379	pci_set_master(pci);
	380
	381	dev->pci = pci;
	382
	383	/* get chip-revision; this is needed to enable bug-fixes */
	384	err = pci_read_config_dword(pci, PCI_CLASS_REVISION, &dev->revision);
	385	if (err < 0) {
	386	ERR(("pci_read_config_dword() failed.\n"));
	387	goto err_disable;
	388	}
	389	dev->revision &= 0xf;
	390
c84e6036	391	/* remap the memory from virtual to physical address */
1da177e4 LT	392
	393	err = pci_request_region(pci, 0, "saa7146");
	394	if (err < 0)
	395	goto err_disable;
	396
	397	dev->mem = ioremap(pci_resource_start(pci, 0),
	398	pci_resource_len(pci, 0));
	399	if (!dev->mem) {
	400	ERR(("ioremap() failed.\n"));
	401	err = -ENODEV;
	402	goto err_release;
	403	}
	404
	405	/* we don't do a master reset here anymore, it screws up
	406	some boards that don't have an i2c-eeprom for configuration
	407	values */
	408	/*
	409	saa7146_write(dev, MC1, MASK_31);
	410	*/
	411
	412	/* disable all irqs */
	413	saa7146_write(dev, IER, 0);
	414
	415	/* shut down all dma transfers and rps tasks */
	416	saa7146_write(dev, MC1, 0x30ff0000);
	417
	418	/* clear out any rps-signals pending */
	419	saa7146_write(dev, MC2, 0xf8000000);
	420
	421	/* request an interrupt for the saa7146 */
8076fe32	422	err = request_irq(pci->irq, interrupt_hw, IRQF_SHARED \| IRQF_DISABLED,
1da177e4 LT	423	dev->name, dev);
	424	if (err < 0) {
	425	ERR(("request_irq() failed.\n"));
	426	goto err_unmap;
	427	}
	428
	429	err = -ENOMEM;
	430
	431	/* get memory for various stuff */
	432	dev->d_rps0.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
	433	&dev->d_rps0.dma_handle);
	434	if (!dev->d_rps0.cpu_addr)
	435	goto err_free_irq;
	436	memset(dev->d_rps0.cpu_addr, 0x0, SAA7146_RPS_MEM);
	437
	438	dev->d_rps1.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
	439	&dev->d_rps1.dma_handle);
	440	if (!dev->d_rps1.cpu_addr)
	441	goto err_free_rps0;
	442	memset(dev->d_rps1.cpu_addr, 0x0, SAA7146_RPS_MEM);
	443
	444	dev->d_i2c.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
	445	&dev->d_i2c.dma_handle);
	446	if (!dev->d_i2c.cpu_addr)
	447	goto err_free_rps1;
	448	memset(dev->d_i2c.cpu_addr, 0x0, SAA7146_RPS_MEM);
	449
	450	/* the rest + print status message */
	451
	452	/* create a nice device name */
	453	sprintf(dev->name, "saa7146 (%d)", saa7146_num);
	454
	455	INFO(("found saa7146 @ mem %p (revision %d, irq %d) (0x%04x,0x%04x).\n", dev->mem, dev->revision, pci->irq, pci->subsystem_vendor, pci->subsystem_device));
	456	dev->ext = ext;
	457
	458	pci_set_drvdata(pci, dev);
	459
3593cab5	460	mutex_init(&dev->lock);
1da177e4 LT	461	spin_lock_init(&dev->int_slock);
	462	spin_lock_init(&dev->slock);
	463
3593cab5	464	mutex_init(&dev->i2c_lock);
1da177e4 LT	465
	466	dev->module = THIS_MODULE;
	467	init_waitqueue_head(&dev->i2c_wq);
	468
	469	/* set some sane pci arbitrition values */
	470	saa7146_write(dev, PCI_BT_V1, 0x1c00101f);
	471
	472	/* TODO: use the status code of the callback */
	473
	474	err = -ENODEV;
	475
	476	if (ext->probe && ext->probe(dev)) {
	477	DEB_D(("ext->probe() failed for %p. skipping device.\n",dev));
	478	goto err_free_i2c;
	479	}
	480
	481	if (ext->attach(dev, pci_ext)) {
	482	DEB_D(("ext->attach() failed for %p. skipping device.\n",dev));
	483	goto err_unprobe;
	484	}
	485
	486	INIT_LIST_HEAD(&dev->item);
	487	list_add_tail(&dev->item,&saa7146_devices);
	488	saa7146_num++;
	489
	490	err = 0;
	491	out:
	492	return err;
	493
	494	err_unprobe:
	495	pci_set_drvdata(pci, NULL);
	496	err_free_i2c:
	497	pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_i2c.cpu_addr,
	498	dev->d_i2c.dma_handle);
	499	err_free_rps1:
	500	pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps1.cpu_addr,
	501	dev->d_rps1.dma_handle);
	502	err_free_rps0:
	503	pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps0.cpu_addr,
	504	dev->d_rps0.dma_handle);
	505	err_free_irq:
	506	free_irq(pci->irq, (void *)dev);
	507	err_unmap:
	508	iounmap(dev->mem);
	509	err_release:
	510	pci_release_region(pci, 0);
	511	err_disable:
	512	pci_disable_device(pci);
	513	err_free:
	514	kfree(dev);
	515	goto out;
	516	}
	517
	518	static void saa7146_remove_one(struct pci_dev *pdev)
	519	{
	520	struct saa7146_dev* dev = pci_get_drvdata(pdev);
	521	struct {
	522	void *addr;
	523	dma_addr_t dma;
	524	} dev_map[] = {
	525	{ dev->d_i2c.cpu_addr, dev->d_i2c.dma_handle },
	526	{ dev->d_rps1.cpu_addr, dev->d_rps1.dma_handle },
	527	{ dev->d_rps0.cpu_addr, dev->d_rps0.dma_handle },
	528	{ NULL, 0 }
529	}, *p;
530
531	DEB_EE(("dev:%p\n",dev));
532
533	dev->ext->detach(dev);
534
535	/* shut down all video dma transfers */
536	saa7146_write(dev, MC1, 0x00ff0000);
537
538	/* disable all irqs, release irq-routine */
539	saa7146_write(dev, IER, 0);
540
541	free_irq(pdev->irq, dev);
542
543	for (p = dev_map; p->addr; p++)
544	pci_free_consistent(pdev, SAA7146_RPS_MEM, p->addr, p->dma);
545
546	iounmap(dev->mem);
547	pci_release_region(pdev, 0);
548	list_del(&dev->item);
549	pci_disable_device(pdev);
550	kfree(dev);
551
552	saa7146_num--;
553	}
554
555	/*********************************************************************************/
556	/* extension handling functions */
557
558	int saa7146_register_extension(struct saa7146_extension* ext)
559	{
560	DEB_EE(("ext:%p\n",ext));
561
562	ext->driver.name = ext->name;
563	ext->driver.id_table = ext->pci_tbl;
564	ext->driver.probe = saa7146_init_one;
565	ext->driver.remove = saa7146_remove_one;
566
567	printk("saa7146: register extension '%s'.\n",ext->name);
178c6efc	568	return pci_register_driver(&ext->driver);
1da177e4 LT	569	}
	570
	571	int saa7146_unregister_extension(struct saa7146_extension* ext)
	572	{
	573	DEB_EE(("ext:%p\n",ext));
	574	printk("saa7146: unregister extension '%s'.\n",ext->name);
	575	pci_unregister_driver(&ext->driver);
	576	return 0;
	577	}
	578
	579	EXPORT_SYMBOL_GPL(saa7146_register_extension);
	580	EXPORT_SYMBOL_GPL(saa7146_unregister_extension);
	581
	582	/* misc functions used by extension modules */
	583	EXPORT_SYMBOL_GPL(saa7146_pgtable_alloc);
	584	EXPORT_SYMBOL_GPL(saa7146_pgtable_free);
	585	EXPORT_SYMBOL_GPL(saa7146_pgtable_build_single);
	586	EXPORT_SYMBOL_GPL(saa7146_vmalloc_build_pgtable);
87c3019d	587	EXPORT_SYMBOL_GPL(saa7146_vfree_destroy_pgtable);
1da177e4 LT	588	EXPORT_SYMBOL_GPL(saa7146_wait_for_debi_done);
	589
	590	EXPORT_SYMBOL_GPL(saa7146_setgpio);
	591
1da177e4 LT	592	EXPORT_SYMBOL_GPL(saa7146_i2c_adapter_prepare);
	593
	594	EXPORT_SYMBOL_GPL(saa7146_debug);
	595	EXPORT_SYMBOL_GPL(saa7146_devices);
	596	EXPORT_SYMBOL_GPL(saa7146_devices_lock);
	597
	598	MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
	599	MODULE_DESCRIPTION("driver for generic saa7146-based hardware");
	600	MODULE_LICENSE("GPL");