1 files changed, 595 insertions, 0 deletions

diff --git a/drivers/media/common/saa7146_core.c b/drivers/media/common/saa7146_core.c
new file mode 100644
index 00000000000..9af2140b57a
--- /dev/null
+++ b/drivers/media/common/saa7146_core.c
@@ -0,0 +1,595 @@
+/*
+    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 */
+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) {
+                        printk(KERN_ERR "%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--) {
+                        printk(KERN_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++) {
+/*
+                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 (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);
+                        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 */
+        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 | 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;
+
+        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);
+
+        INIT_LIST_HEAD(&dev->item);
+        list_add_tail(&dev->item,&saa7146_devices);
+        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);
+        /* Zero the PCI drvdata after use. */
+        pci_set_drvdata(pdev, NULL);
+
+        /* 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");