diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/media/common/saa7146_core.c | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
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.c | 547 |
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 0000000..9f6c19a --- /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"); |