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437 lines
12 KiB
437 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 "flexcop-pci" |
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#define DRIVER_AUTHOR "Patrick Boettcher <[email protected]>" |
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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 occurred */ |
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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("Continuity 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, 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, apparently without reason (%08x)\n", |
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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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info("card revision %x", fc_pci->pdev->revision); |
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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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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_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 const 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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module_pci_driver(flexcop_pci_driver); |
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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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