| /* |
| 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; |
| |
| unsigned int saa7146_debug; |
| |
| 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; |
| 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 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_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_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"); |