1da177e4c3
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!
547 lines
14 KiB
C
547 lines
14 KiB
C
/*
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saa7146.o - driver for generic saa7146-based hardware
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Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <media/saa7146.h>
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LIST_HEAD(saa7146_devices);
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DECLARE_MUTEX(saa7146_devices_lock);
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static int saa7146_num = 0;
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unsigned int saa7146_debug = 0;
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module_param(saa7146_debug, int, 0644);
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MODULE_PARM_DESC(saa7146_debug, "debug level (default: 0)");
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#if 0
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static void dump_registers(struct saa7146_dev* dev)
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{
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int i = 0;
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INFO((" @ %li jiffies:\n",jiffies));
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for(i = 0; i <= 0x148; i+=4) {
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printk("0x%03x: 0x%08x\n",i,saa7146_read(dev,i));
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}
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}
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#endif
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/****************************************************************************
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* gpio and debi helper functions
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****************************************************************************/
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void saa7146_setgpio(struct saa7146_dev *dev, int port, u32 data)
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{
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u32 value = 0;
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BUG_ON(port > 3);
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value = saa7146_read(dev, GPIO_CTRL);
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value &= ~(0xff << (8*port));
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value |= (data << (8*port));
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saa7146_write(dev, GPIO_CTRL, value);
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}
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/* This DEBI code is based on the saa7146 Stradis driver by Nathan Laredo */
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int saa7146_wait_for_debi_done(struct saa7146_dev *dev, int nobusyloop)
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{
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unsigned long start;
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/* wait for registers to be programmed */
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start = jiffies;
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while (1) {
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if (saa7146_read(dev, MC2) & 2)
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break;
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if (time_after(jiffies, start + HZ/20)) {
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DEB_S(("timed out while waiting for registers getting programmed\n"));
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return -ETIMEDOUT;
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}
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if (nobusyloop)
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msleep(1);
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}
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/* wait for transfer to complete */
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start = jiffies;
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while (1) {
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if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
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break;
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saa7146_read(dev, MC2);
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if (time_after(jiffies, start + HZ/4)) {
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DEB_S(("timed out while waiting for transfer completion\n"));
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return -ETIMEDOUT;
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}
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if (nobusyloop)
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msleep(1);
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}
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return 0;
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}
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/****************************************************************************
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* general helper functions
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****************************************************************************/
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/* this is videobuf_vmalloc_to_sg() from video-buf.c
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make sure virt has been allocated with vmalloc_32(), otherwise the BUG()
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may be triggered on highmem machines */
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static struct scatterlist* vmalloc_to_sg(unsigned char *virt, int nr_pages)
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{
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struct scatterlist *sglist;
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struct page *pg;
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int i;
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sglist = kmalloc(sizeof(struct scatterlist)*nr_pages, GFP_KERNEL);
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if (NULL == sglist)
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return NULL;
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memset(sglist,0,sizeof(struct scatterlist)*nr_pages);
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for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
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pg = vmalloc_to_page(virt);
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if (NULL == pg)
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goto err;
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if (PageHighMem(pg))
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BUG();
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sglist[i].page = pg;
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sglist[i].length = PAGE_SIZE;
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}
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return sglist;
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err:
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kfree(sglist);
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return NULL;
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}
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/********************************************************************************/
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/* common page table functions */
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char *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa7146_pgtable *pt)
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{
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int pages = (length+PAGE_SIZE-1)/PAGE_SIZE;
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char *mem = vmalloc_32(length);
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int slen = 0;
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if (NULL == mem) {
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return NULL;
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}
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if (!(pt->slist = vmalloc_to_sg(mem, pages))) {
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vfree(mem);
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return NULL;
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}
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if (saa7146_pgtable_alloc(pci, pt)) {
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kfree(pt->slist);
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pt->slist = NULL;
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vfree(mem);
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return NULL;
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}
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slen = pci_map_sg(pci,pt->slist,pages,PCI_DMA_FROMDEVICE);
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if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen)) {
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return NULL;
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}
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return mem;
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}
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void saa7146_pgtable_free(struct pci_dev *pci, struct saa7146_pgtable *pt)
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{
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if (NULL == pt->cpu)
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return;
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pci_free_consistent(pci, pt->size, pt->cpu, pt->dma);
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pt->cpu = NULL;
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if (NULL != pt->slist) {
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kfree(pt->slist);
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pt->slist = NULL;
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}
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}
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int saa7146_pgtable_alloc(struct pci_dev *pci, struct saa7146_pgtable *pt)
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{
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u32 *cpu;
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dma_addr_t dma_addr;
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cpu = pci_alloc_consistent(pci, PAGE_SIZE, &dma_addr);
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if (NULL == cpu) {
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return -ENOMEM;
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}
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pt->size = PAGE_SIZE;
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pt->cpu = cpu;
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pt->dma = dma_addr;
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return 0;
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}
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int saa7146_pgtable_build_single(struct pci_dev *pci, struct saa7146_pgtable *pt,
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struct scatterlist *list, int sglen )
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{
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u32 *ptr, fill;
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int nr_pages = 0;
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int i,p;
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BUG_ON(0 == sglen);
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BUG_ON(list->offset > PAGE_SIZE);
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/* if we have a user buffer, the first page may not be
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aligned to a page boundary. */
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pt->offset = list->offset;
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ptr = pt->cpu;
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for (i = 0; i < sglen; i++, list++) {
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/*
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printk("i:%d, adr:0x%08x, len:%d, offset:%d\n", i,sg_dma_address(list), sg_dma_len(list), list->offset);
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*/
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for (p = 0; p * 4096 < list->length; p++, ptr++) {
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*ptr = cpu_to_le32(sg_dma_address(list) + p * 4096);
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nr_pages++;
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}
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}
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/* safety; fill the page table up with the last valid page */
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fill = *(ptr-1);
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for(i=nr_pages;i<1024;i++) {
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*ptr++ = fill;
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}
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/*
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ptr = pt->cpu;
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printk("offset: %d\n",pt->offset);
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for(i=0;i<5;i++) {
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printk("ptr1 %d: 0x%08x\n",i,ptr[i]);
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}
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*/
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return 0;
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}
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/********************************************************************************/
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/* interrupt handler */
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static irqreturn_t interrupt_hw(int irq, void *dev_id, struct pt_regs *regs)
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{
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struct saa7146_dev *dev = dev_id;
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u32 isr = 0;
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/* read out the interrupt status register */
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isr = saa7146_read(dev, ISR);
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/* is this our interrupt? */
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if ( 0 == isr ) {
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/* nope, some other device */
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return IRQ_NONE;
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}
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saa7146_write(dev, ISR, isr);
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if( 0 != (dev->ext)) {
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if( 0 != (dev->ext->irq_mask & isr )) {
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if( 0 != dev->ext->irq_func ) {
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dev->ext->irq_func(dev, &isr);
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}
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isr &= ~dev->ext->irq_mask;
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}
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}
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if (0 != (isr & (MASK_27))) {
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DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
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if( 0 != dev->vv_data && 0 != dev->vv_callback) {
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dev->vv_callback(dev,isr);
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}
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isr &= ~MASK_27;
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}
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if (0 != (isr & (MASK_28))) {
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if( 0 != dev->vv_data && 0 != dev->vv_callback) {
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dev->vv_callback(dev,isr);
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}
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isr &= ~MASK_28;
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}
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if (0 != (isr & (MASK_16|MASK_17))) {
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u32 status = saa7146_read(dev, I2C_STATUS);
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if( (0x3 == (status & 0x3)) || (0 == (status & 0x1)) ) {
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SAA7146_IER_DISABLE(dev, MASK_16|MASK_17);
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/* only wake up if we expect something */
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if( 0 != dev->i2c_op ) {
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u32 psr = (saa7146_read(dev, PSR) >> 16) & 0x2;
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u32 ssr = (saa7146_read(dev, SSR) >> 17) & 0x1f;
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DEB_I2C(("irq: i2c, status: 0x%08x, psr:0x%02x, ssr:0x%02x).\n",status,psr,ssr));
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dev->i2c_op = 0;
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wake_up(&dev->i2c_wq);
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} else {
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DEB_I2C(("unexpected irq: i2c, status: 0x%08x, isr %#x\n",status, isr));
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}
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} else {
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DEB_I2C(("unhandled irq: i2c, status: 0x%08x, isr %#x\n",status, isr));
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}
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isr &= ~(MASK_16|MASK_17);
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}
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if( 0 != isr ) {
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ERR(("warning: interrupt enabled, but not handled properly.(0x%08x)\n",isr));
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ERR(("disabling interrupt source(s)!\n"));
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SAA7146_IER_DISABLE(dev,isr);
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}
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return IRQ_HANDLED;
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}
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/*********************************************************************************/
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/* configuration-functions */
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static int saa7146_init_one(struct pci_dev *pci, const struct pci_device_id *ent)
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{
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struct saa7146_pci_extension_data *pci_ext = (struct saa7146_pci_extension_data *)ent->driver_data;
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struct saa7146_extension *ext = pci_ext->ext;
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struct saa7146_dev *dev;
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int err = -ENOMEM;
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dev = kmalloc(sizeof(struct saa7146_dev), GFP_KERNEL);
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if (!dev) {
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ERR(("out of memory.\n"));
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goto out;
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}
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/* clear out mem for sure */
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memset(dev, 0x0, sizeof(struct saa7146_dev));
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DEB_EE(("pci:%p\n",pci));
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err = pci_enable_device(pci);
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if (err < 0) {
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ERR(("pci_enable_device() failed.\n"));
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goto err_free;
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}
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/* enable bus-mastering */
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pci_set_master(pci);
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dev->pci = pci;
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/* get chip-revision; this is needed to enable bug-fixes */
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err = pci_read_config_dword(pci, PCI_CLASS_REVISION, &dev->revision);
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if (err < 0) {
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ERR(("pci_read_config_dword() failed.\n"));
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goto err_disable;
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}
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dev->revision &= 0xf;
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/* remap the memory from virtual to physical adress */
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err = pci_request_region(pci, 0, "saa7146");
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if (err < 0)
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goto err_disable;
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dev->mem = ioremap(pci_resource_start(pci, 0),
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pci_resource_len(pci, 0));
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if (!dev->mem) {
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ERR(("ioremap() failed.\n"));
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err = -ENODEV;
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goto err_release;
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}
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/* we don't do a master reset here anymore, it screws up
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some boards that don't have an i2c-eeprom for configuration
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values */
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/*
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saa7146_write(dev, MC1, MASK_31);
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*/
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/* disable all irqs */
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saa7146_write(dev, IER, 0);
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/* shut down all dma transfers and rps tasks */
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saa7146_write(dev, MC1, 0x30ff0000);
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/* clear out any rps-signals pending */
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saa7146_write(dev, MC2, 0xf8000000);
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/* request an interrupt for the saa7146 */
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err = request_irq(pci->irq, interrupt_hw, SA_SHIRQ | SA_INTERRUPT,
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dev->name, dev);
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if (err < 0) {
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ERR(("request_irq() failed.\n"));
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goto err_unmap;
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}
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err = -ENOMEM;
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/* get memory for various stuff */
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dev->d_rps0.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
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&dev->d_rps0.dma_handle);
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if (!dev->d_rps0.cpu_addr)
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goto err_free_irq;
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memset(dev->d_rps0.cpu_addr, 0x0, SAA7146_RPS_MEM);
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dev->d_rps1.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
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&dev->d_rps1.dma_handle);
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if (!dev->d_rps1.cpu_addr)
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goto err_free_rps0;
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memset(dev->d_rps1.cpu_addr, 0x0, SAA7146_RPS_MEM);
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dev->d_i2c.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
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&dev->d_i2c.dma_handle);
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if (!dev->d_i2c.cpu_addr)
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goto err_free_rps1;
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memset(dev->d_i2c.cpu_addr, 0x0, SAA7146_RPS_MEM);
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/* the rest + print status message */
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/* create a nice device name */
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sprintf(dev->name, "saa7146 (%d)", saa7146_num);
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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));
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dev->ext = ext;
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pci_set_drvdata(pci, dev);
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init_MUTEX(&dev->lock);
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spin_lock_init(&dev->int_slock);
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spin_lock_init(&dev->slock);
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init_MUTEX(&dev->i2c_lock);
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dev->module = THIS_MODULE;
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init_waitqueue_head(&dev->i2c_wq);
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/* set some sane pci arbitrition values */
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saa7146_write(dev, PCI_BT_V1, 0x1c00101f);
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/* TODO: use the status code of the callback */
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err = -ENODEV;
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if (ext->probe && ext->probe(dev)) {
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DEB_D(("ext->probe() failed for %p. skipping device.\n",dev));
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goto err_free_i2c;
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}
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if (ext->attach(dev, pci_ext)) {
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DEB_D(("ext->attach() failed for %p. skipping device.\n",dev));
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goto err_unprobe;
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}
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INIT_LIST_HEAD(&dev->item);
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list_add_tail(&dev->item,&saa7146_devices);
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saa7146_num++;
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err = 0;
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out:
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return err;
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err_unprobe:
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pci_set_drvdata(pci, NULL);
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err_free_i2c:
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pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_i2c.cpu_addr,
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dev->d_i2c.dma_handle);
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err_free_rps1:
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pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps1.cpu_addr,
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dev->d_rps1.dma_handle);
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err_free_rps0:
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pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps0.cpu_addr,
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dev->d_rps0.dma_handle);
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err_free_irq:
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free_irq(pci->irq, (void *)dev);
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err_unmap:
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iounmap(dev->mem);
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err_release:
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pci_release_region(pci, 0);
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err_disable:
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pci_disable_device(pci);
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err_free:
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kfree(dev);
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goto out;
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}
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static void saa7146_remove_one(struct pci_dev *pdev)
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{
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struct saa7146_dev* dev = pci_get_drvdata(pdev);
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struct {
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void *addr;
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dma_addr_t dma;
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} dev_map[] = {
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{ dev->d_i2c.cpu_addr, dev->d_i2c.dma_handle },
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{ dev->d_rps1.cpu_addr, dev->d_rps1.dma_handle },
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{ dev->d_rps0.cpu_addr, dev->d_rps0.dma_handle },
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{ NULL, 0 }
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}, *p;
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DEB_EE(("dev:%p\n",dev));
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dev->ext->detach(dev);
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/* shut down all video dma transfers */
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saa7146_write(dev, MC1, 0x00ff0000);
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/* disable all irqs, release irq-routine */
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saa7146_write(dev, IER, 0);
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free_irq(pdev->irq, dev);
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for (p = dev_map; p->addr; p++)
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pci_free_consistent(pdev, SAA7146_RPS_MEM, p->addr, p->dma);
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iounmap(dev->mem);
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pci_release_region(pdev, 0);
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list_del(&dev->item);
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|
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");
|