[linux-block.git] / drivers / media / common / saa7146 / saa7146_core.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
    saa7146.o - driver for generic saa7146-based hardware

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

*/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <media/drv-intf/saa7146.h>
#include <linux/module.h>

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;

	pr_info(" @ %li jiffies:\n", jiffies);
	for (i = 0; i <= 0x148; i += 4)
		pr_info("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) {
			pr_debug("%s: %s timed out while waiting for registers getting programmed\n",
			       dev->name, __func__);
			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, __func__);
			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--) {
			pr_err("%s: %s timed out while waiting for registers getting programmed\n",
			       dev->name, __func__);
			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, __func__);
			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)
{
	__le32       *cpu;
	dma_addr_t   dma_addr = 0;

	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  )
{
	__le32 *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++) {
/*
		pr_debug("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;
	pr_debug("offset: %d\n", pt->offset);
	for(i=0;i<5;i++) {
		pr_debug("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 (dev->ext) {
		if (dev->ext->irq_mask & isr) {
			if (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 (dev->vv_data && dev->vv_callback)
			dev->vv_callback(dev,isr);
		isr &= ~MASK_27;
	}
	if (0 != (isr & (MASK_28))) {
		if (dev->vv_data && 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);
			pr_warn("%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;
	}

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

	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 */
	dev->revision = pci->revision;

	/* 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,
			  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_zalloc_consistent(pci, SAA7146_RPS_MEM,
						     &dev->d_rps0.dma_handle);
	if (!dev->d_rps0.cpu_addr)
		goto err_free_irq;

	dev->d_rps1.cpu_addr = pci_zalloc_consistent(pci, SAA7146_RPS_MEM,
						     &dev->d_rps1.dma_handle);
	if (!dev->d_rps1.cpu_addr)
		goto err_free_rps0;

	dev->d_i2c.cpu_addr = pci_zalloc_consistent(pci, SAA7146_RPS_MEM,
						    &dev->d_i2c.dma_handle);
	if (!dev->d_i2c.cpu_addr)
		goto err_free_rps1;

	/* the rest + print status message */

	pr_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;

	mutex_init(&dev->v4l2_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_free_i2c;
	}
	/* V4L extensions will set the pci drvdata to the v4l2_device in the
	   attach() above. So for those cards that do not use V4L we have to
	   set it explicitly. */
	pci_set_drvdata(pci, &dev->v4l2_dev);

	saa7146_num++;

	err = 0;
out:
	return err;

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 v4l2_device *v4l2_dev = pci_get_drvdata(pdev);
	struct saa7146_dev *dev = to_saa7146_dev(v4l2_dev);
	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);
	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;

	pr_info("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);
	pr_info("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);

MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
MODULE_DESCRIPTION("driver for generic saa7146-based hardware");
MODULE_LICENSE("GPL");
Commit	Line	Data
74ba9207	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	saa7146.o - driver for generic saa7146-based hardware
	4
	5	Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
	6
1da177e4 LT	7	*/
1da177e4 LT	8
44d0b80e JP	9	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
44d0b80e JP	10
d647f0b7	11	#include <media/drv-intf/saa7146.h>
7a707b89	12	#include <linux/module.h>
1da177e4	13
c2c62d81	14	static int saa7146_num;
1da177e4	15
c2c62d81	16	unsigned int saa7146_debug;
1da177e4	17
804b4458	18	module_param(saa7146_debug, uint, 0644);
1da177e4 LT	19	MODULE_PARM_DESC(saa7146_debug, "debug level (default: 0)");
	20
	21	#if 0
	22	static void dump_registers(struct saa7146_dev* dev)
	23	{
	24	int i = 0;
	25
44d0b80e JP	26	pr_info(" @ %li jiffies:\n", jiffies);
	27	for (i = 0; i <= 0x148; i += 4)
	28	pr_info("0x%03x: 0x%08x\n", i, saa7146_read(dev, i));
1da177e4 LT	29	}
	30	#endif
	31
	32	/****************************************************************************
	33	* gpio and debi helper functions
	34	****************************************************************************/
	35
	36	void saa7146_setgpio(struct saa7146_dev *dev, int port, u32 data)
	37	{
	38	u32 value = 0;
	39
	40	BUG_ON(port > 3);
	41
	42	value = saa7146_read(dev, GPIO_CTRL);
	43	value &= ~(0xff << (8*port));
	44	value \|= (data << (8*port));
	45	saa7146_write(dev, GPIO_CTRL, value);
	46	}
	47
	48	/* This DEBI code is based on the saa7146 Stradis driver by Nathan Laredo */
26ac14e2 OE	49	static inline int saa7146_wait_for_debi_done_sleep(struct saa7146_dev *dev,
26ac14e2 OE	50	unsigned long us1, unsigned long us2)
1da177e4	51	{
26ac14e2	52	unsigned long timeout;
25de1926	53	int err;
1da177e4 LT	54
1da177e4 LT	55	/* wait for registers to be programmed */
26ac14e2	56	timeout = jiffies + usecs_to_jiffies(us1);
1da177e4	57	while (1) {
26ac14e2	58	err = time_after(jiffies, timeout);
25de1926 OE	59	if (saa7146_read(dev, MC2) & 2)
	60	break;
	61	if (err) {
847713ea	62	pr_debug("%s: %s timed out while waiting for registers getting programmed\n",
44d0b80e	63	dev->name, __func__);
1da177e4 LT	64	return -ETIMEDOUT;
1da177e4 LT	65	}
26ac14e2	66	msleep(1);
1da177e4 LT	67	}
	68
	69	/* wait for transfer to complete */
26ac14e2	70	timeout = jiffies + usecs_to_jiffies(us2);
1da177e4	71	while (1) {
26ac14e2	72	err = time_after(jiffies, timeout);
1da177e4 LT	73	if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
	74	break;
	75	saa7146_read(dev, MC2);
25de1926	76	if (err) {
44d0b80e JP	77	DEB_S("%s: %s timed out while waiting for transfer completion\n",
44d0b80e JP	78	dev->name, __func__);
1da177e4 LT	79	return -ETIMEDOUT;
1da177e4 LT	80	}
26ac14e2	81	msleep(1);
1da177e4 LT	82	}
	83
	84	return 0;
	85	}
	86
26ac14e2 OE	87	static inline int saa7146_wait_for_debi_done_busyloop(struct saa7146_dev *dev,
	88	unsigned long us1, unsigned long us2)
	89	{
	90	unsigned long loops;
	91
	92	/* wait for registers to be programmed */
	93	loops = us1;
	94	while (1) {
	95	if (saa7146_read(dev, MC2) & 2)
	96	break;
	97	if (!loops--) {
44d0b80e JP	98	pr_err("%s: %s timed out while waiting for registers getting programmed\n",
44d0b80e JP	99	dev->name, __func__);
26ac14e2 OE	100	return -ETIMEDOUT;
	101	}
	102	udelay(1);
	103	}
	104
	105	/* wait for transfer to complete */
	106	loops = us2 / 5;
	107	while (1) {
	108	if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
	109	break;
	110	saa7146_read(dev, MC2);
	111	if (!loops--) {
44d0b80e JP	112	DEB_S("%s: %s timed out while waiting for transfer completion\n",
44d0b80e JP	113	dev->name, __func__);
26ac14e2 OE	114	return -ETIMEDOUT;
	115	}
	116	udelay(5);
	117	}
	118
	119	return 0;
	120	}
	121
	122	int saa7146_wait_for_debi_done(struct saa7146_dev *dev, int nobusyloop)
	123	{
	124	if (nobusyloop)
	125	return saa7146_wait_for_debi_done_sleep(dev, 50000, 250000);
	126	else
	127	return saa7146_wait_for_debi_done_busyloop(dev, 50000, 250000);
	128	}
	129
1da177e4 LT	130	/****************************************************************************
	131	* general helper functions
	132	****************************************************************************/
	133
c1accaa2	134	/* this is videobuf_vmalloc_to_sg() from videobuf-dma-sg.c
1da177e4 LT	135	make sure virt has been allocated with vmalloc_32(), otherwise the BUG()
	136	may be triggered on highmem machines */
	137	static struct scatterlist* vmalloc_to_sg(unsigned char *virt, int nr_pages)
	138	{
	139	struct scatterlist *sglist;
	140	struct page *pg;
	141	int i;
	142
7408187d	143	sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
1da177e4 LT	144	if (NULL == sglist)
1da177e4 LT	145	return NULL;
45711f1a	146	sg_init_table(sglist, nr_pages);
1da177e4 LT	147	for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
	148	pg = vmalloc_to_page(virt);
	149	if (NULL == pg)
	150	goto err;
ae24601b	151	BUG_ON(PageHighMem(pg));
642f1490	152	sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);
1da177e4 LT	153	}
	154	return sglist;
	155
	156	err:
	157	kfree(sglist);
	158	return NULL;
	159	}
	160
	161	/********************************************************************************/
	162	/* common page table functions */
	163
804b4458	164	void saa7146_vmalloc_build_pgtable(struct pci_dev pci, long length, struct saa7146_pgtable *pt)
1da177e4 LT	165	{
1da177e4 LT	166	int pages = (length+PAGE_SIZE-1)/PAGE_SIZE;
804b4458	167	void *mem = vmalloc_32(length);
1da177e4 LT	168	int slen = 0;
1da177e4 LT	169
87c3019d JB	170	if (NULL == mem)
87c3019d JB	171	goto err_null;
1da177e4	172
87c3019d JB	173	if (!(pt->slist = vmalloc_to_sg(mem, pages)))
87c3019d JB	174	goto err_free_mem;
1da177e4	175
87c3019d JB	176	if (saa7146_pgtable_alloc(pci, pt))
87c3019d JB	177	goto err_free_slist;
1da177e4	178
87c3019d JB	179	pt->nents = pages;
	180	slen = pci_map_sg(pci,pt->slist,pt->nents,PCI_DMA_FROMDEVICE);
	181	if (0 == slen)
	182	goto err_free_pgtable;
	183
	184	if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen))
	185	goto err_unmap_sg;
1da177e4 LT	186
1da177e4 LT	187	return mem;
87c3019d JB	188
	189	err_unmap_sg:
	190	pci_unmap_sg(pci, pt->slist, pt->nents, PCI_DMA_FROMDEVICE);
	191	err_free_pgtable:
	192	saa7146_pgtable_free(pci, pt);
	193	err_free_slist:
	194	kfree(pt->slist);
	195	pt->slist = NULL;
	196	err_free_mem:
	197	vfree(mem);
	198	err_null:
	199	return NULL;
	200	}
	201
804b4458	202	void saa7146_vfree_destroy_pgtable(struct pci_dev pci, void mem, struct saa7146_pgtable *pt)
87c3019d JB	203	{
	204	pci_unmap_sg(pci, pt->slist, pt->nents, PCI_DMA_FROMDEVICE);
	205	saa7146_pgtable_free(pci, pt);
	206	kfree(pt->slist);
	207	pt->slist = NULL;
	208	vfree(mem);
1da177e4 LT	209	}
	210
	211	void saa7146_pgtable_free(struct pci_dev pci, struct saa7146_pgtable pt)
	212	{
	213	if (NULL == pt->cpu)
	214	return;
	215	pci_free_consistent(pci, pt->size, pt->cpu, pt->dma);
	216	pt->cpu = NULL;
1da177e4 LT	217	}
	218
	219	int saa7146_pgtable_alloc(struct pci_dev pci, struct saa7146_pgtable pt)
	220	{
a36ef6b1	221	__le32 *cpu;
614b147b	222	dma_addr_t dma_addr = 0;
1da177e4 LT	223
	224	cpu = pci_alloc_consistent(pci, PAGE_SIZE, &dma_addr);
	225	if (NULL == cpu) {
	226	return -ENOMEM;
	227	}
	228	pt->size = PAGE_SIZE;
	229	pt->cpu = cpu;
	230	pt->dma = dma_addr;
	231
	232	return 0;
	233	}
	234
	235	int saa7146_pgtable_build_single(struct pci_dev pci, struct saa7146_pgtable pt,
	236	struct scatterlist *list, int sglen )
	237	{
a36ef6b1	238	__le32 *ptr, fill;
1da177e4 LT	239	int nr_pages = 0;
	240	int i,p;
	241
	242	BUG_ON(0 == sglen);
	243	BUG_ON(list->offset > PAGE_SIZE);
	244
	245	/* if we have a user buffer, the first page may not be
	246	aligned to a page boundary. */
	247	pt->offset = list->offset;
	248
	249	ptr = pt->cpu;
	250	for (i = 0; i < sglen; i++, list++) {
	251	/*
44d0b80e JP	252	pr_debug("i:%d, adr:0x%08x, len:%d, offset:%d\n",
	253	i, sg_dma_address(list), sg_dma_len(list),
	254	list->offset);
1da177e4 LT	255	*/
	256	for (p = 0; p * 4096 < list->length; p++, ptr++) {
	257	ptr = cpu_to_le32(sg_dma_address(list) + p 4096);
	258	nr_pages++;
	259	}
	260	}
	261
	262
	263	/* safety; fill the page table up with the last valid page */
	264	fill = *(ptr-1);
	265	for(i=nr_pages;i<1024;i++) {
	266	*ptr++ = fill;
	267	}
	268
	269	/*
	270	ptr = pt->cpu;
44d0b80e	271	pr_debug("offset: %d\n", pt->offset);
1da177e4	272	for(i=0;i<5;i++) {
44d0b80e	273	pr_debug("ptr1 %d: 0x%08x\n", i, ptr[i]);
1da177e4 LT	274	}
	275	*/
	276	return 0;
	277	}
	278
	279	/********************************************************************************/
	280	/* interrupt handler */
7d12e780	281	static irqreturn_t interrupt_hw(int irq, void *dev_id)
1da177e4 LT	282	{
1da177e4 LT	283	struct saa7146_dev *dev = dev_id;
276e49a0 OE	284	u32 isr;
276e49a0 OE	285	u32 ack_isr;
1da177e4 LT	286
1da177e4 LT	287	/* read out the interrupt status register */
276e49a0	288	ack_isr = isr = saa7146_read(dev, ISR);
1da177e4 LT	289
	290	/* is this our interrupt? */
	291	if ( 0 == isr ) {
	292	/* nope, some other device */
	293	return IRQ_NONE;
	294	}
	295
5fa1247a AV	296	if (dev->ext) {
	297	if (dev->ext->irq_mask & isr) {
	298	if (dev->ext->irq_func)
1da177e4	299	dev->ext->irq_func(dev, &isr);
1da177e4 LT	300	isr &= ~dev->ext->irq_mask;
	301	}
	302	}
	303	if (0 != (isr & (MASK_27))) {
44d0b80e	304	DEB_INT("irq: RPS0 (0x%08x)\n", isr);
5fa1247a	305	if (dev->vv_data && dev->vv_callback)
1da177e4	306	dev->vv_callback(dev,isr);
1da177e4 LT	307	isr &= ~MASK_27;
	308	}
	309	if (0 != (isr & (MASK_28))) {
5fa1247a	310	if (dev->vv_data && dev->vv_callback)
1da177e4	311	dev->vv_callback(dev,isr);
1da177e4 LT	312	isr &= ~MASK_28;
	313	}
	314	if (0 != (isr & (MASK_16\|MASK_17))) {
276e49a0 OE	315	SAA7146_IER_DISABLE(dev, MASK_16\|MASK_17);
	316	/* only wake up if we expect something */
	317	if (0 != dev->i2c_op) {
	318	dev->i2c_op = 0;
	319	wake_up(&dev->i2c_wq);
1da177e4	320	} else {
276e49a0 OE	321	u32 psr = saa7146_read(dev, PSR);
276e49a0 OE	322	u32 ssr = saa7146_read(dev, SSR);
44d0b80e JP	323	pr_warn("%s: unexpected i2c irq: isr %08x psr %08x ssr %08x\n",
44d0b80e JP	324	dev->name, isr, psr, ssr);
1da177e4 LT	325	}
	326	isr &= ~(MASK_16\|MASK_17);
	327	}
	328	if( 0 != isr ) {
44d0b80e JP	329	ERR("warning: interrupt enabled, but not handled properly.(0x%08x)\n",
	330	isr);
	331	ERR("disabling interrupt source(s)!\n");
1da177e4 LT	332	SAA7146_IER_DISABLE(dev,isr);
1da177e4 LT	333	}
276e49a0	334	saa7146_write(dev, ISR, ack_isr);
1da177e4 LT	335	return IRQ_HANDLED;
	336	}
	337
	338	/*********************************************************************************/
	339	/* configuration-functions */
	340
	341	static int saa7146_init_one(struct pci_dev pci, const struct pci_device_id ent)
	342	{
	343	struct saa7146_pci_extension_data pci_ext = (struct saa7146_pci_extension_data )ent->driver_data;
	344	struct saa7146_extension *ext = pci_ext->ext;
	345	struct saa7146_dev *dev;
	346	int err = -ENOMEM;
	347
7408187d PI	348	/* clear out mem for sure */
7408187d PI	349	dev = kzalloc(sizeof(struct saa7146_dev), GFP_KERNEL);
1da177e4	350	if (!dev) {
44d0b80e	351	ERR("out of memory\n");
1da177e4 LT	352	goto out;
	353	}
	354
a0bd3e0b LR	355	/* create a nice device name */
	356	sprintf(dev->name, "saa7146 (%d)", saa7146_num);
	357
44d0b80e	358	DEB_EE("pci:%p\n", pci);
1da177e4 LT	359
	360	err = pci_enable_device(pci);
	361	if (err < 0) {
44d0b80e	362	ERR("pci_enable_device() failed\n");
230b65f9	363	goto err_free;
1da177e4 LT	364	}
	365
	366	/* enable bus-mastering */
	367	pci_set_master(pci);
	368
	369	dev->pci = pci;
	370
	371	/* get chip-revision; this is needed to enable bug-fixes */
abd34d8d	372	dev->revision = pci->revision;
1da177e4	373
c84e6036	374	/* remap the memory from virtual to physical address */
1da177e4 LT	375
	376	err = pci_request_region(pci, 0, "saa7146");
	377	if (err < 0)
	378	goto err_disable;
	379
	380	dev->mem = ioremap(pci_resource_start(pci, 0),
	381	pci_resource_len(pci, 0));
	382	if (!dev->mem) {
44d0b80e	383	ERR("ioremap() failed\n");
1da177e4 LT	384	err = -ENODEV;
	385	goto err_release;
	386	}
	387
	388	/* we don't do a master reset here anymore, it screws up
	389	some boards that don't have an i2c-eeprom for configuration
	390	values */
	391	/*
	392	saa7146_write(dev, MC1, MASK_31);
	393	*/
	394
	395	/* disable all irqs */
	396	saa7146_write(dev, IER, 0);
	397
	398	/* shut down all dma transfers and rps tasks */
	399	saa7146_write(dev, MC1, 0x30ff0000);
	400
	401	/* clear out any rps-signals pending */
	402	saa7146_write(dev, MC2, 0xf8000000);
	403
	404	/* request an interrupt for the saa7146 */
68b3869e	405	err = request_irq(pci->irq, interrupt_hw, IRQF_SHARED,
1da177e4 LT	406	dev->name, dev);
1da177e4 LT	407	if (err < 0) {
44d0b80e	408	ERR("request_irq() failed\n");
1da177e4 LT	409	goto err_unmap;
	410	}
	411
	412	err = -ENOMEM;
	413
	414	/* get memory for various stuff */
6850aeab JP	415	dev->d_rps0.cpu_addr = pci_zalloc_consistent(pci, SAA7146_RPS_MEM,
6850aeab JP	416	&dev->d_rps0.dma_handle);
1da177e4 LT	417	if (!dev->d_rps0.cpu_addr)
1da177e4 LT	418	goto err_free_irq;
1da177e4	419
6850aeab JP	420	dev->d_rps1.cpu_addr = pci_zalloc_consistent(pci, SAA7146_RPS_MEM,
6850aeab JP	421	&dev->d_rps1.dma_handle);
1da177e4 LT	422	if (!dev->d_rps1.cpu_addr)
1da177e4 LT	423	goto err_free_rps0;
1da177e4	424
6850aeab JP	425	dev->d_i2c.cpu_addr = pci_zalloc_consistent(pci, SAA7146_RPS_MEM,
6850aeab JP	426	&dev->d_i2c.dma_handle);
1da177e4 LT	427	if (!dev->d_i2c.cpu_addr)
1da177e4 LT	428	goto err_free_rps1;
1da177e4 LT	429
	430	/* the rest + print status message */
	431
44d0b80e JP	432	pr_info("found saa7146 @ mem %p (revision %d, irq %d) (0x%04x,0x%04x)\n",
	433	dev->mem, dev->revision, pci->irq,
	434	pci->subsystem_vendor, pci->subsystem_device);
1da177e4 LT	435	dev->ext = ext;
1da177e4 LT	436
9af39713	437	mutex_init(&dev->v4l2_lock);
1da177e4 LT	438	spin_lock_init(&dev->int_slock);
	439	spin_lock_init(&dev->slock);
	440
3593cab5	441	mutex_init(&dev->i2c_lock);
1da177e4 LT	442
	443	dev->module = THIS_MODULE;
	444	init_waitqueue_head(&dev->i2c_wq);
	445
	446	/* set some sane pci arbitrition values */
	447	saa7146_write(dev, PCI_BT_V1, 0x1c00101f);
	448
	449	/* TODO: use the status code of the callback */
	450
	451	err = -ENODEV;
	452
	453	if (ext->probe && ext->probe(dev)) {
44d0b80e	454	DEB_D("ext->probe() failed for %p. skipping device.\n", dev);
1da177e4 LT	455	goto err_free_i2c;
	456	}
	457
	458	if (ext->attach(dev, pci_ext)) {
44d0b80e	459	DEB_D("ext->attach() failed for %p. skipping device.\n", dev);
ef77a26b	460	goto err_free_i2c;
1da177e4	461	}
230b65f9 HV	462	/* V4L extensions will set the pci drvdata to the v4l2_device in the
	463	attach() above. So for those cards that do not use V4L we have to
	464	set it explicitly. */
	465	pci_set_drvdata(pci, &dev->v4l2_dev);
1da177e4	466
1da177e4 LT	467	saa7146_num++;
	468
	469	err = 0;
	470	out:
	471	return err;
	472
1da177e4 LT	473	err_free_i2c:
	474	pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_i2c.cpu_addr,
	475	dev->d_i2c.dma_handle);
	476	err_free_rps1:
	477	pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps1.cpu_addr,
	478	dev->d_rps1.dma_handle);
	479	err_free_rps0:
	480	pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps0.cpu_addr,
	481	dev->d_rps0.dma_handle);
	482	err_free_irq:
	483	free_irq(pci->irq, (void *)dev);
	484	err_unmap:
	485	iounmap(dev->mem);
	486	err_release:
	487	pci_release_region(pci, 0);
	488	err_disable:
	489	pci_disable_device(pci);
	490	err_free:
	491	kfree(dev);
	492	goto out;
	493	}
	494
	495	static void saa7146_remove_one(struct pci_dev *pdev)
	496	{
ef77a26b	497	struct v4l2_device *v4l2_dev = pci_get_drvdata(pdev);
45d80943	498	struct saa7146_dev *dev = to_saa7146_dev(v4l2_dev);
1da177e4 LT	499	struct {
	500	void *addr;
	501	dma_addr_t dma;
	502	} dev_map[] = {
	503	{ dev->d_i2c.cpu_addr, dev->d_i2c.dma_handle },
	504	{ dev->d_rps1.cpu_addr, dev->d_rps1.dma_handle },
	505	{ dev->d_rps0.cpu_addr, dev->d_rps0.dma_handle },
	506	{ NULL, 0 }
	507	}, *p;
	508
44d0b80e	509	DEB_EE("dev:%p\n", dev);
1da177e4 LT	510
	511	dev->ext->detach(dev);
	512
	513	/* shut down all video dma transfers */
	514	saa7146_write(dev, MC1, 0x00ff0000);
	515
	516	/* disable all irqs, release irq-routine */
	517	saa7146_write(dev, IER, 0);
	518
	519	free_irq(pdev->irq, dev);
	520
	521	for (p = dev_map; p->addr; p++)
	522	pci_free_consistent(pdev, SAA7146_RPS_MEM, p->addr, p->dma);
	523
	524	iounmap(dev->mem);
	525	pci_release_region(pdev, 0);
1da177e4 LT	526	pci_disable_device(pdev);
	527	kfree(dev);
	528
	529	saa7146_num--;
	530	}
	531
	532	/*********************************************************************************/
	533	/* extension handling functions */
	534
	535	int saa7146_register_extension(struct saa7146_extension* ext)
	536	{
44d0b80e	537	DEB_EE("ext:%p\n", ext);
1da177e4 LT	538
	539	ext->driver.name = ext->name;
	540	ext->driver.id_table = ext->pci_tbl;
	541	ext->driver.probe = saa7146_init_one;
	542	ext->driver.remove = saa7146_remove_one;
	543
44d0b80e	544	pr_info("register extension '%s'\n", ext->name);
178c6efc	545	return pci_register_driver(&ext->driver);
1da177e4 LT	546	}
	547
	548	int saa7146_unregister_extension(struct saa7146_extension* ext)
	549	{
44d0b80e JP	550	DEB_EE("ext:%p\n", ext);
44d0b80e JP	551	pr_info("unregister extension '%s'\n", ext->name);
1da177e4 LT	552	pci_unregister_driver(&ext->driver);
	553	return 0;
	554	}
	555
	556	EXPORT_SYMBOL_GPL(saa7146_register_extension);
	557	EXPORT_SYMBOL_GPL(saa7146_unregister_extension);
	558
	559	/* misc functions used by extension modules */
	560	EXPORT_SYMBOL_GPL(saa7146_pgtable_alloc);
	561	EXPORT_SYMBOL_GPL(saa7146_pgtable_free);
	562	EXPORT_SYMBOL_GPL(saa7146_pgtable_build_single);
	563	EXPORT_SYMBOL_GPL(saa7146_vmalloc_build_pgtable);
87c3019d	564	EXPORT_SYMBOL_GPL(saa7146_vfree_destroy_pgtable);
1da177e4 LT	565	EXPORT_SYMBOL_GPL(saa7146_wait_for_debi_done);
	566
	567	EXPORT_SYMBOL_GPL(saa7146_setgpio);
	568
1da177e4 LT	569	EXPORT_SYMBOL_GPL(saa7146_i2c_adapter_prepare);
	570
	571	EXPORT_SYMBOL_GPL(saa7146_debug);
1da177e4 LT	572
	573	MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
	574	MODULE_DESCRIPTION("driver for generic saa7146-based hardware");
	575	MODULE_LICENSE("GPL");