mirror of https://gitee.com/openkylin/linux.git
453 lines
12 KiB
C
453 lines
12 KiB
C
/*
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* Linux driver the digital TV devices equipped with B2C2 FlexcopII(b)/III
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* flexcop-pci.c - covers the PCI part including DMA transfers
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* see flexcop.c for copyright information
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*/
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#define FC_LOG_PREFIX "flexcop-pci"
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#include "flexcop-common.h"
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static int enable_pid_filtering = 1;
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module_param(enable_pid_filtering, int, 0444);
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MODULE_PARM_DESC(enable_pid_filtering,
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"enable hardware pid filtering: supported values: 0 (fullts), 1");
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static int irq_chk_intv = 100;
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module_param(irq_chk_intv, int, 0644);
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MODULE_PARM_DESC(irq_chk_intv, "set the interval for IRQ streaming watchdog.");
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#ifdef CONFIG_DVB_B2C2_FLEXCOP_DEBUG
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#define dprintk(level,args...) \
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do { if ((debug & level)) printk(args); } while (0)
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#define DEBSTATUS ""
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#else
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#define dprintk(level,args...)
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#define DEBSTATUS " (debugging is not enabled)"
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#endif
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#define deb_info(args...) dprintk(0x01, args)
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#define deb_reg(args...) dprintk(0x02, args)
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#define deb_ts(args...) dprintk(0x04, args)
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#define deb_irq(args...) dprintk(0x08, args)
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#define deb_chk(args...) dprintk(0x10, args)
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static int debug;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug,
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"set debug level (1=info,2=regs,4=TS,8=irqdma,16=check (|-able))."
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DEBSTATUS);
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#define DRIVER_VERSION "0.1"
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#define DRIVER_NAME "Technisat/B2C2 FlexCop II/IIb/III Digital TV PCI Driver"
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#define DRIVER_AUTHOR "Patrick Boettcher <patrick.boettcher@desy.de>"
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struct flexcop_pci {
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struct pci_dev *pdev;
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#define FC_PCI_INIT 0x01
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#define FC_PCI_DMA_INIT 0x02
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int init_state;
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void __iomem *io_mem;
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u32 irq;
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/* buffersize (at least for DMA1, need to be % 188 == 0,
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* this logic is required */
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#define FC_DEFAULT_DMA1_BUFSIZE (1280 * 188)
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#define FC_DEFAULT_DMA2_BUFSIZE (10 * 188)
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struct flexcop_dma dma[2];
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int active_dma1_addr; /* 0 = addr0 of dma1; 1 = addr1 of dma1 */
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u32 last_dma1_cur_pos;
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/* position of the pointer last time the timer/packet irq occured */
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int count;
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int count_prev;
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int stream_problem;
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spinlock_t irq_lock;
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unsigned long last_irq;
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struct delayed_work irq_check_work;
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struct flexcop_device *fc_dev;
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};
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static int lastwreg, lastwval, lastrreg, lastrval;
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static flexcop_ibi_value flexcop_pci_read_ibi_reg(struct flexcop_device *fc,
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flexcop_ibi_register r)
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{
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struct flexcop_pci *fc_pci = fc->bus_specific;
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flexcop_ibi_value v;
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v.raw = readl(fc_pci->io_mem + r);
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if (lastrreg != r || lastrval != v.raw) {
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lastrreg = r; lastrval = v.raw;
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deb_reg("new rd: %3x: %08x\n", r, v.raw);
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}
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return v;
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}
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static int flexcop_pci_write_ibi_reg(struct flexcop_device *fc,
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flexcop_ibi_register r, flexcop_ibi_value v)
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{
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struct flexcop_pci *fc_pci = fc->bus_specific;
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if (lastwreg != r || lastwval != v.raw) {
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lastwreg = r; lastwval = v.raw;
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deb_reg("new wr: %3x: %08x\n", r, v.raw);
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}
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writel(v.raw, fc_pci->io_mem + r);
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return 0;
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}
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static void flexcop_pci_irq_check_work(struct work_struct *work)
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{
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struct flexcop_pci *fc_pci =
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container_of(work, struct flexcop_pci, irq_check_work.work);
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struct flexcop_device *fc = fc_pci->fc_dev;
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if (fc->feedcount) {
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if (fc_pci->count == fc_pci->count_prev) {
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deb_chk("no IRQ since the last check\n");
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if (fc_pci->stream_problem++ == 3) {
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struct dvb_demux_feed *feed;
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deb_info("flexcop-pci: stream problem, resetting pid filter\n");
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spin_lock_irq(&fc->demux.lock);
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list_for_each_entry(feed, &fc->demux.feed_list,
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list_head) {
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flexcop_pid_feed_control(fc, feed, 0);
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}
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list_for_each_entry(feed, &fc->demux.feed_list,
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list_head) {
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flexcop_pid_feed_control(fc, feed, 1);
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}
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spin_unlock_irq(&fc->demux.lock);
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fc_pci->stream_problem = 0;
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}
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} else {
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fc_pci->stream_problem = 0;
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fc_pci->count_prev = fc_pci->count;
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}
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}
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schedule_delayed_work(&fc_pci->irq_check_work,
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msecs_to_jiffies(irq_chk_intv < 100 ? 100 : irq_chk_intv));
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}
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/* When PID filtering is turned on, we use the timer IRQ, because small amounts
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* of data need to be passed to the user space instantly as well. When PID
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* filtering is turned off, we use the page-change-IRQ */
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static irqreturn_t flexcop_pci_isr(int irq, void *dev_id)
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{
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struct flexcop_pci *fc_pci = dev_id;
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struct flexcop_device *fc = fc_pci->fc_dev;
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unsigned long flags;
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flexcop_ibi_value v;
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irqreturn_t ret = IRQ_HANDLED;
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spin_lock_irqsave(&fc_pci->irq_lock, flags);
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v = fc->read_ibi_reg(fc, irq_20c);
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/* errors */
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if (v.irq_20c.Data_receiver_error)
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deb_chk("data receiver error\n");
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if (v.irq_20c.Continuity_error_flag)
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deb_chk("Contunuity error flag is set\n");
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if (v.irq_20c.LLC_SNAP_FLAG_set)
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deb_chk("LLC_SNAP_FLAG_set is set\n");
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if (v.irq_20c.Transport_Error)
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deb_chk("Transport error\n");
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if ((fc_pci->count % 1000) == 0)
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deb_chk("%d valid irq took place so far\n", fc_pci->count);
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if (v.irq_20c.DMA1_IRQ_Status == 1) {
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if (fc_pci->active_dma1_addr == 0)
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flexcop_pass_dmx_packets(fc_pci->fc_dev,
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fc_pci->dma[0].cpu_addr0,
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fc_pci->dma[0].size / 188);
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else
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flexcop_pass_dmx_packets(fc_pci->fc_dev,
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fc_pci->dma[0].cpu_addr1,
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fc_pci->dma[0].size / 188);
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deb_irq("page change to page: %d\n",!fc_pci->active_dma1_addr);
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fc_pci->active_dma1_addr = !fc_pci->active_dma1_addr;
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/* for the timer IRQ we only can use buffer dmx feeding, because we don't have
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* complete TS packets when reading from the DMA memory */
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} else if (v.irq_20c.DMA1_Timer_Status == 1) {
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dma_addr_t cur_addr =
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fc->read_ibi_reg(fc,dma1_008).dma_0x8.dma_cur_addr << 2;
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u32 cur_pos = cur_addr - fc_pci->dma[0].dma_addr0;
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deb_irq("%u irq: %08x cur_addr: %llx: cur_pos: %08x, "
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"last_cur_pos: %08x ",
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jiffies_to_usecs(jiffies - fc_pci->last_irq),
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v.raw, (unsigned long long)cur_addr, cur_pos,
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fc_pci->last_dma1_cur_pos);
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fc_pci->last_irq = jiffies;
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/* buffer end was reached, restarted from the beginning
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* pass the data from last_cur_pos to the buffer end to the demux
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*/
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if (cur_pos < fc_pci->last_dma1_cur_pos) {
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deb_irq(" end was reached: passing %d bytes ",
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(fc_pci->dma[0].size*2 - 1) -
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fc_pci->last_dma1_cur_pos);
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flexcop_pass_dmx_data(fc_pci->fc_dev,
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fc_pci->dma[0].cpu_addr0 +
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fc_pci->last_dma1_cur_pos,
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(fc_pci->dma[0].size*2) -
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fc_pci->last_dma1_cur_pos);
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fc_pci->last_dma1_cur_pos = 0;
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}
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if (cur_pos > fc_pci->last_dma1_cur_pos) {
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deb_irq(" passing %d bytes ",
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cur_pos - fc_pci->last_dma1_cur_pos);
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flexcop_pass_dmx_data(fc_pci->fc_dev,
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fc_pci->dma[0].cpu_addr0 +
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fc_pci->last_dma1_cur_pos,
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cur_pos - fc_pci->last_dma1_cur_pos);
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}
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deb_irq("\n");
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fc_pci->last_dma1_cur_pos = cur_pos;
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fc_pci->count++;
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} else {
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deb_irq("isr for flexcop called, "
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"apparently without reason (%08x)\n", v.raw);
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ret = IRQ_NONE;
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}
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spin_unlock_irqrestore(&fc_pci->irq_lock, flags);
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return ret;
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}
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static int flexcop_pci_stream_control(struct flexcop_device *fc, int onoff)
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{
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struct flexcop_pci *fc_pci = fc->bus_specific;
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if (onoff) {
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flexcop_dma_config(fc, &fc_pci->dma[0], FC_DMA_1);
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flexcop_dma_config(fc, &fc_pci->dma[1], FC_DMA_2);
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flexcop_dma_config_timer(fc, FC_DMA_1, 0);
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flexcop_dma_xfer_control(fc, FC_DMA_1,
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FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1, 1);
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deb_irq("DMA xfer enabled\n");
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fc_pci->last_dma1_cur_pos = 0;
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flexcop_dma_control_timer_irq(fc, FC_DMA_1, 1);
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deb_irq("IRQ enabled\n");
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fc_pci->count_prev = fc_pci->count;
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} else {
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flexcop_dma_control_timer_irq(fc, FC_DMA_1, 0);
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deb_irq("IRQ disabled\n");
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flexcop_dma_xfer_control(fc, FC_DMA_1,
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FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1, 0);
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deb_irq("DMA xfer disabled\n");
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}
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return 0;
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}
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static int flexcop_pci_dma_init(struct flexcop_pci *fc_pci)
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{
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int ret;
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ret = flexcop_dma_allocate(fc_pci->pdev, &fc_pci->dma[0],
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FC_DEFAULT_DMA1_BUFSIZE);
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if (ret != 0)
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return ret;
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ret = flexcop_dma_allocate(fc_pci->pdev, &fc_pci->dma[1],
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FC_DEFAULT_DMA2_BUFSIZE);
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if (ret != 0) {
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flexcop_dma_free(&fc_pci->dma[0]);
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return ret;
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}
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flexcop_sram_set_dest(fc_pci->fc_dev, FC_SRAM_DEST_MEDIA |
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FC_SRAM_DEST_NET, FC_SRAM_DEST_TARGET_DMA1);
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flexcop_sram_set_dest(fc_pci->fc_dev, FC_SRAM_DEST_CAO |
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FC_SRAM_DEST_CAI, FC_SRAM_DEST_TARGET_DMA2);
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fc_pci->init_state |= FC_PCI_DMA_INIT;
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return ret;
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}
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static void flexcop_pci_dma_exit(struct flexcop_pci *fc_pci)
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{
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if (fc_pci->init_state & FC_PCI_DMA_INIT) {
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flexcop_dma_free(&fc_pci->dma[0]);
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flexcop_dma_free(&fc_pci->dma[1]);
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}
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fc_pci->init_state &= ~FC_PCI_DMA_INIT;
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}
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static int flexcop_pci_init(struct flexcop_pci *fc_pci)
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{
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int ret;
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u8 card_rev;
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pci_read_config_byte(fc_pci->pdev, PCI_CLASS_REVISION, &card_rev);
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info("card revision %x", card_rev);
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if ((ret = pci_enable_device(fc_pci->pdev)) != 0)
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return ret;
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pci_set_master(fc_pci->pdev);
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if ((ret = pci_request_regions(fc_pci->pdev, DRIVER_NAME)) != 0)
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goto err_pci_disable_device;
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fc_pci->io_mem = pci_iomap(fc_pci->pdev, 0, 0x800);
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if (!fc_pci->io_mem) {
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err("cannot map io memory\n");
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ret = -EIO;
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goto err_pci_release_regions;
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}
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pci_set_drvdata(fc_pci->pdev, fc_pci);
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spin_lock_init(&fc_pci->irq_lock);
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if ((ret = request_irq(fc_pci->pdev->irq, flexcop_pci_isr,
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IRQF_SHARED, DRIVER_NAME, fc_pci)) != 0)
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goto err_pci_iounmap;
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fc_pci->init_state |= FC_PCI_INIT;
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return ret;
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err_pci_iounmap:
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pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
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pci_set_drvdata(fc_pci->pdev, NULL);
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err_pci_release_regions:
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pci_release_regions(fc_pci->pdev);
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err_pci_disable_device:
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pci_disable_device(fc_pci->pdev);
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return ret;
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}
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static void flexcop_pci_exit(struct flexcop_pci *fc_pci)
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{
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if (fc_pci->init_state & FC_PCI_INIT) {
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free_irq(fc_pci->pdev->irq, fc_pci);
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pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
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pci_set_drvdata(fc_pci->pdev, NULL);
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pci_release_regions(fc_pci->pdev);
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pci_disable_device(fc_pci->pdev);
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}
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fc_pci->init_state &= ~FC_PCI_INIT;
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}
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static int flexcop_pci_probe(struct pci_dev *pdev,
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const struct pci_device_id *ent)
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{
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struct flexcop_device *fc;
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struct flexcop_pci *fc_pci;
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int ret = -ENOMEM;
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if ((fc = flexcop_device_kmalloc(sizeof(struct flexcop_pci))) == NULL) {
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err("out of memory\n");
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return -ENOMEM;
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}
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/* general flexcop init */
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fc_pci = fc->bus_specific;
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fc_pci->fc_dev = fc;
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fc->read_ibi_reg = flexcop_pci_read_ibi_reg;
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fc->write_ibi_reg = flexcop_pci_write_ibi_reg;
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fc->i2c_request = flexcop_i2c_request;
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fc->get_mac_addr = flexcop_eeprom_check_mac_addr;
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fc->stream_control = flexcop_pci_stream_control;
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if (enable_pid_filtering)
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info("will use the HW PID filter.");
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else
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info("will pass the complete TS to the demuxer.");
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fc->pid_filtering = enable_pid_filtering;
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fc->bus_type = FC_PCI;
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fc->dev = &pdev->dev;
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fc->owner = THIS_MODULE;
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/* bus specific part */
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fc_pci->pdev = pdev;
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if ((ret = flexcop_pci_init(fc_pci)) != 0)
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goto err_kfree;
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/* init flexcop */
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if ((ret = flexcop_device_initialize(fc)) != 0)
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goto err_pci_exit;
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/* init dma */
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if ((ret = flexcop_pci_dma_init(fc_pci)) != 0)
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goto err_fc_exit;
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INIT_DELAYED_WORK(&fc_pci->irq_check_work, flexcop_pci_irq_check_work);
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if (irq_chk_intv > 0)
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schedule_delayed_work(&fc_pci->irq_check_work,
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msecs_to_jiffies(irq_chk_intv < 100 ?
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100 :
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irq_chk_intv));
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return ret;
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err_fc_exit:
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flexcop_device_exit(fc);
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err_pci_exit:
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flexcop_pci_exit(fc_pci);
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err_kfree:
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flexcop_device_kfree(fc);
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return ret;
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}
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/* in theory every _exit function should be called exactly two times,
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* here and in the bail-out-part of the _init-function
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*/
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static void flexcop_pci_remove(struct pci_dev *pdev)
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{
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struct flexcop_pci *fc_pci = pci_get_drvdata(pdev);
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if (irq_chk_intv > 0)
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cancel_delayed_work(&fc_pci->irq_check_work);
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flexcop_pci_dma_exit(fc_pci);
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flexcop_device_exit(fc_pci->fc_dev);
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flexcop_pci_exit(fc_pci);
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flexcop_device_kfree(fc_pci->fc_dev);
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}
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static struct pci_device_id flexcop_pci_tbl[] = {
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{ PCI_DEVICE(0x13d0, 0x2103) },
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{ },
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};
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MODULE_DEVICE_TABLE(pci, flexcop_pci_tbl);
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static struct pci_driver flexcop_pci_driver = {
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.name = "b2c2_flexcop_pci",
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.id_table = flexcop_pci_tbl,
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.probe = flexcop_pci_probe,
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.remove = flexcop_pci_remove,
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};
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static int __init flexcop_pci_module_init(void)
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{
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return pci_register_driver(&flexcop_pci_driver);
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}
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static void __exit flexcop_pci_module_exit(void)
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{
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pci_unregister_driver(&flexcop_pci_driver);
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}
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module_init(flexcop_pci_module_init);
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module_exit(flexcop_pci_module_exit);
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_NAME);
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MODULE_LICENSE("GPL");
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