[GitHub/mt8127/android_kernel_alcatel_ttab.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 */
int saa7146_wait_for_debi_done(struct saa7146_dev *dev, int nobusyloop)
{
	unsigned long start;
	int err;

	/* wait for registers to be programmed */
	start = jiffies;
	while (1) {
		err = time_after(jiffies, start + HZ/20);
		if (saa7146_read(dev, MC2) & 2)
			break;
		if (err) {
			DEB_S(("timed out while waiting for registers getting programmed\n"));
			return -ETIMEDOUT;
		}
		if (nobusyloop)
			msleep(1);
	}

	/* wait for transfer to complete */
	start = jiffies;
	while (1) {
		err = time_after(jiffies, start + HZ/4);
		if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
			break;
		saa7146_read(dev, MC2);
		if (err) {
			DEB_S(("timed out while waiting for transfer completion\n"));
			return -ETIMEDOUT;
		}
		if (nobusyloop)
			msleep(1);
	}

	return 0;
}

/****************************************************************************
 * 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 adress */

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