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authorLinus Torvalds2005-04-17 00:20:36 +0200
committerLinus Torvalds2005-04-17 00:20:36 +0200
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/media/common/saa7146_core.c
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Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/media/common/saa7146_core.c')
-rw-r--r--drivers/media/common/saa7146_core.c547
1 files changed, 547 insertions, 0 deletions
diff --git a/drivers/media/common/saa7146_core.c b/drivers/media/common/saa7146_core.c
new file mode 100644
index 000000000000..9f6c19ac1285
--- /dev/null
+++ b/drivers/media/common/saa7146_core.c
@@ -0,0 +1,547 @@
+/*
+ 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);
+DECLARE_MUTEX(saa7146_devices_lock);
+
+static int saa7146_num = 0;
+
+unsigned int saa7146_debug = 0;
+
+module_param(saa7146_debug, int, 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;
+
+ /* wait for registers to be programmed */
+ start = jiffies;
+ while (1) {
+ if (saa7146_read(dev, MC2) & 2)
+ break;
+ if (time_after(jiffies, start + HZ/20)) {
+ 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) {
+ if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
+ break;
+ saa7146_read(dev, MC2);
+ if (time_after(jiffies, start + HZ/4)) {
+ 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 video-buf.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 = kmalloc(sizeof(struct scatterlist)*nr_pages, GFP_KERNEL);
+ if (NULL == sglist)
+ return NULL;
+ memset(sglist,0,sizeof(struct scatterlist)*nr_pages);
+ for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
+ pg = vmalloc_to_page(virt);
+ if (NULL == pg)
+ goto err;
+ if (PageHighMem(pg))
+ BUG();
+ sglist[i].page = pg;
+ sglist[i].length = PAGE_SIZE;
+ }
+ return sglist;
+
+ err:
+ kfree(sglist);
+ return NULL;
+}
+
+/********************************************************************************/
+/* common page table functions */
+
+char *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa7146_pgtable *pt)
+{
+ int pages = (length+PAGE_SIZE-1)/PAGE_SIZE;
+ char *mem = vmalloc_32(length);
+ int slen = 0;
+
+ if (NULL == mem) {
+ return NULL;
+ }
+
+ if (!(pt->slist = vmalloc_to_sg(mem, pages))) {
+ vfree(mem);
+ return NULL;
+ }
+
+ if (saa7146_pgtable_alloc(pci, pt)) {
+ kfree(pt->slist);
+ pt->slist = NULL;
+ vfree(mem);
+ return NULL;
+ }
+
+ slen = pci_map_sg(pci,pt->slist,pages,PCI_DMA_FROMDEVICE);
+ if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen)) {
+ return NULL;
+ }
+
+ return 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;
+ if (NULL != pt->slist) {
+ kfree(pt->slist);
+ pt->slist = 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 pt_regs *regs)
+{
+ struct saa7146_dev *dev = dev_id;
+ u32 isr = 0;
+
+ /* read out the interrupt status register */
+ isr = saa7146_read(dev, ISR);
+
+ /* is this our interrupt? */
+ if ( 0 == isr ) {
+ /* nope, some other device */
+ return IRQ_NONE;
+ }
+
+ saa7146_write(dev, ISR, isr);
+
+ 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))) {
+ u32 status = saa7146_read(dev, I2C_STATUS);
+ if( (0x3 == (status & 0x3)) || (0 == (status & 0x1)) ) {
+ SAA7146_IER_DISABLE(dev, MASK_16|MASK_17);
+ /* only wake up if we expect something */
+ if( 0 != dev->i2c_op ) {
+ u32 psr = (saa7146_read(dev, PSR) >> 16) & 0x2;
+ u32 ssr = (saa7146_read(dev, SSR) >> 17) & 0x1f;
+ DEB_I2C(("irq: i2c, status: 0x%08x, psr:0x%02x, ssr:0x%02x).\n",status,psr,ssr));
+ dev->i2c_op = 0;
+ wake_up(&dev->i2c_wq);
+ } else {
+ DEB_I2C(("unexpected irq: i2c, status: 0x%08x, isr %#x\n",status, isr));
+ }
+ } else {
+ DEB_I2C(("unhandled irq: i2c, status: 0x%08x, isr %#x\n",status, isr));
+ }
+ 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);
+ }
+ 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;
+
+ dev = kmalloc(sizeof(struct saa7146_dev), GFP_KERNEL);
+ if (!dev) {
+ ERR(("out of memory.\n"));
+ goto out;
+ }
+
+ /* clear out mem for sure */
+ memset(dev, 0x0, sizeof(struct saa7146_dev));
+
+ 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, SA_SHIRQ | SA_INTERRUPT,
+ 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);
+
+ init_MUTEX(&dev->lock);
+ spin_lock_init(&dev->int_slock);
+ spin_lock_init(&dev->slock);
+
+ init_MUTEX(&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_module_init(&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_wait_for_debi_done);
+
+EXPORT_SYMBOL_GPL(saa7146_setgpio);
+
+EXPORT_SYMBOL_GPL(saa7146_i2c_transfer);
+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");