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flexcop-pci.c

/*
 * This file is part of linux driver the digital TV devices equipped with B2C2 FlexcopII(b)/III
 *
 * flexcop-pci.c - covers the PCI part including DMA transfers.
 *
 * see flexcop.c for copyright information.
 */

#define FC_LOG_PREFIX "flexcop-pci"
#include "flexcop-common.h"

static int enable_pid_filtering = 1;
module_param(enable_pid_filtering, int, 0444);
MODULE_PARM_DESC(enable_pid_filtering, "enable hardware pid filtering: supported values: 0 (fullts), 1");

static int irq_chk_intv;
module_param(irq_chk_intv, int, 0644);
MODULE_PARM_DESC(irq_chk_intv, "set the interval for IRQ watchdog (currently just debugging).");

#ifdef CONFIG_DVB_B2C2_FLEXCOP_DEBUG
#define dprintk(level,args...) \
      do { if ((debug & level)) printk(args); } while (0)
#define DEBSTATUS ""
#else
#define dprintk(level,args...)
#define DEBSTATUS " (debugging is not enabled)"
#endif

#define deb_info(args...)  dprintk(0x01,args)
#define deb_reg(args...)   dprintk(0x02,args)
#define deb_ts(args...)    dprintk(0x04,args)
#define deb_irq(args...)   dprintk(0x08,args)
#define deb_chk(args...)   dprintk(0x10,args)

static int debug = 0;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "set debug level (1=info,2=regs,4=TS,8=irqdma (|-able))." DEBSTATUS);

#define DRIVER_VERSION "0.1"
#define DRIVER_NAME "Technisat/B2C2 FlexCop II/IIb/III Digital TV PCI Driver"
#define DRIVER_AUTHOR "Patrick Boettcher <patrick.boettcher@desy.de>"

struct flexcop_pci {
      struct pci_dev *pdev;

#define FC_PCI_INIT     0x01
#define FC_PCI_DMA_INIT 0x02
      int init_state;

      void __iomem *io_mem;
      u32 irq;
/* buffersize (at least for DMA1, need to be % 188 == 0,
 * this logic is required */
#define FC_DEFAULT_DMA1_BUFSIZE (1280 * 188)
#define FC_DEFAULT_DMA2_BUFSIZE (10 * 188)
      struct flexcop_dma dma[2];

      int active_dma1_addr; /* 0 = addr0 of dma1; 1 = addr1 of dma1 */
      u32 last_dma1_cur_pos; /* position of the pointer last time the timer/packet irq occured */
      int count;

      spinlock_t irq_lock;

      unsigned long last_irq;

      struct delayed_work irq_check_work;

      struct flexcop_device *fc_dev;
};

static int lastwreg,lastwval,lastrreg,lastrval;

static flexcop_ibi_value flexcop_pci_read_ibi_reg (struct flexcop_device *fc, flexcop_ibi_register r)
{
      struct flexcop_pci *fc_pci = fc->bus_specific;
      flexcop_ibi_value v;
      v.raw = readl(fc_pci->io_mem + r);

      if (lastrreg != r || lastrval != v.raw) {
            lastrreg = r; lastrval = v.raw;
            deb_reg("new rd: %3x: %08x\n",r,v.raw);
      }

      return v;
}

static int flexcop_pci_write_ibi_reg(struct flexcop_device *fc, flexcop_ibi_register r, flexcop_ibi_value v)
{
      struct flexcop_pci *fc_pci = fc->bus_specific;

      if (lastwreg != r || lastwval != v.raw) {
            lastwreg = r; lastwval = v.raw;
            deb_reg("new wr: %3x: %08x\n",r,v.raw);
      }

      writel(v.raw, fc_pci->io_mem + r);
      return 0;
}

static void flexcop_pci_irq_check_work(struct work_struct *work)
{
      struct flexcop_pci *fc_pci =
            container_of(work, struct flexcop_pci, irq_check_work.work);
      struct flexcop_device *fc = fc_pci->fc_dev;

      flexcop_ibi_value v = fc->read_ibi_reg(fc,sram_dest_reg_714);

      flexcop_dump_reg(fc_pci->fc_dev,dma1_000,4);

      if (v.sram_dest_reg_714.net_ovflow_error)
            deb_chk("sram net_ovflow_error\n");
      if (v.sram_dest_reg_714.media_ovflow_error)
            deb_chk("sram media_ovflow_error\n");
      if (v.sram_dest_reg_714.cai_ovflow_error)
            deb_chk("sram cai_ovflow_error\n");
      if (v.sram_dest_reg_714.cai_ovflow_error)
            deb_chk("sram cai_ovflow_error\n");

      schedule_delayed_work(&fc_pci->irq_check_work,
                  msecs_to_jiffies(irq_chk_intv < 100 ? 100 : irq_chk_intv));
}

/* When PID filtering is turned on, we use the timer IRQ, because small amounts
 * of data need to be passed to the user space instantly as well. When PID
 * filtering is turned off, we use the page-change-IRQ */
static irqreturn_t flexcop_pci_isr(int irq, void *dev_id)
{
      struct flexcop_pci *fc_pci = dev_id;
      struct flexcop_device *fc = fc_pci->fc_dev;
      unsigned long flags;
      flexcop_ibi_value v;
      irqreturn_t ret = IRQ_HANDLED;

      spin_lock_irqsave(&fc_pci->irq_lock,flags);

      v = fc->read_ibi_reg(fc,irq_20c);

   /* errors */
      if (v.irq_20c.Data_receiver_error)
            deb_chk("data receiver error\n");
      if (v.irq_20c.Continuity_error_flag)
            deb_chk("Contunuity error flag is set\n");
      if (v.irq_20c.LLC_SNAP_FLAG_set)
            deb_chk("LLC_SNAP_FLAG_set is set\n");
      if (v.irq_20c.Transport_Error)
            deb_chk("Transport error\n");

      if ((fc_pci->count % 1000) == 0)
            deb_chk("%d valid irq took place so far\n",fc_pci->count);

      if (v.irq_20c.DMA1_IRQ_Status == 1) {
            if (fc_pci->active_dma1_addr == 0)
                  flexcop_pass_dmx_packets(fc_pci->fc_dev,fc_pci->dma[0].cpu_addr0,fc_pci->dma[0].size / 188);
            else
                  flexcop_pass_dmx_packets(fc_pci->fc_dev,fc_pci->dma[0].cpu_addr1,fc_pci->dma[0].size / 188);

            deb_irq("page change to page: %d\n",!fc_pci->active_dma1_addr);
            fc_pci->active_dma1_addr = !fc_pci->active_dma1_addr;
      } else if (v.irq_20c.DMA1_Timer_Status == 1) {
            /* for the timer IRQ we only can use buffer dmx feeding, because we don't have
             * complete TS packets when reading from the DMA memory */
            dma_addr_t cur_addr =
                  fc->read_ibi_reg(fc,dma1_008).dma_0x8.dma_cur_addr << 2;
            u32 cur_pos = cur_addr - fc_pci->dma[0].dma_addr0;

            deb_irq("%u irq: %08x cur_addr: %llx: cur_pos: %08x, last_cur_pos: %08x ",
                        jiffies_to_usecs(jiffies - fc_pci->last_irq),
                        v.raw, (unsigned long long)cur_addr, cur_pos,
                        fc_pci->last_dma1_cur_pos);
            fc_pci->last_irq = jiffies;

            /* buffer end was reached, restarted from the beginning
             * pass the data from last_cur_pos to the buffer end to the demux
             */
            if (cur_pos < fc_pci->last_dma1_cur_pos) {
                  deb_irq(" end was reached: passing %d bytes ",(fc_pci->dma[0].size*2 - 1) - fc_pci->last_dma1_cur_pos);
                  flexcop_pass_dmx_data(fc_pci->fc_dev,
                              fc_pci->dma[0].cpu_addr0 + fc_pci->last_dma1_cur_pos,
                              (fc_pci->dma[0].size*2) - fc_pci->last_dma1_cur_pos);
                  fc_pci->last_dma1_cur_pos = 0;
            }

            if (cur_pos > fc_pci->last_dma1_cur_pos) {
                  deb_irq(" passing %d bytes ",cur_pos - fc_pci->last_dma1_cur_pos);
                  flexcop_pass_dmx_data(fc_pci->fc_dev,
                              fc_pci->dma[0].cpu_addr0 + fc_pci->last_dma1_cur_pos,
                              cur_pos - fc_pci->last_dma1_cur_pos);
            }
            deb_irq("\n");

            fc_pci->last_dma1_cur_pos = cur_pos;
            fc_pci->count++;
      } else {
            deb_irq("isr for flexcop called, apparently without reason (%08x)\n",v.raw);
            ret = IRQ_NONE;
      }

      spin_unlock_irqrestore(&fc_pci->irq_lock,flags);

      return ret;
}

static int flexcop_pci_stream_control(struct flexcop_device *fc, int onoff)
{
      struct flexcop_pci *fc_pci = fc->bus_specific;
      if (onoff) {
            flexcop_dma_config(fc,&fc_pci->dma[0],FC_DMA_1);
            flexcop_dma_config(fc,&fc_pci->dma[1],FC_DMA_2);

            flexcop_dma_config_timer(fc,FC_DMA_1,0);

            flexcop_dma_xfer_control(fc,FC_DMA_1,FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1,1);
            deb_irq("DMA xfer enabled\n");

            fc_pci->last_dma1_cur_pos = 0;
            flexcop_dma_control_timer_irq(fc,FC_DMA_1,1);
            deb_irq("IRQ enabled\n");

//          fc_pci->active_dma1_addr = 0;
//          flexcop_dma_control_size_irq(fc,FC_DMA_1,1);

            if (irq_chk_intv > 0)
                  schedule_delayed_work(&fc_pci->irq_check_work,
                              msecs_to_jiffies(irq_chk_intv < 100 ? 100 : irq_chk_intv));
      } else {
            if (irq_chk_intv > 0)
                  cancel_delayed_work(&fc_pci->irq_check_work);

            flexcop_dma_control_timer_irq(fc,FC_DMA_1,0);
            deb_irq("IRQ disabled\n");

//          flexcop_dma_control_size_irq(fc,FC_DMA_1,0);

            flexcop_dma_xfer_control(fc,FC_DMA_1,FC_DMA_SUBADDR_0 | FC_DMA_SUBADDR_1,0);
            deb_irq("DMA xfer disabled\n");
      }

      return 0;
}

static int flexcop_pci_dma_init(struct flexcop_pci *fc_pci)
{
      int ret;
      if ((ret = flexcop_dma_allocate(fc_pci->pdev,&fc_pci->dma[0],FC_DEFAULT_DMA1_BUFSIZE)) != 0)
            return ret;

      if ((ret = flexcop_dma_allocate(fc_pci->pdev,&fc_pci->dma[1],FC_DEFAULT_DMA2_BUFSIZE)) != 0) {
            flexcop_dma_free(&fc_pci->dma[0]);
            return ret;
      }

      flexcop_sram_set_dest(fc_pci->fc_dev,FC_SRAM_DEST_MEDIA | FC_SRAM_DEST_NET, FC_SRAM_DEST_TARGET_DMA1);
      flexcop_sram_set_dest(fc_pci->fc_dev,FC_SRAM_DEST_CAO   | FC_SRAM_DEST_CAI, FC_SRAM_DEST_TARGET_DMA2);

      fc_pci->init_state |= FC_PCI_DMA_INIT;

      return ret;
}

static void flexcop_pci_dma_exit(struct flexcop_pci *fc_pci)
{
      if (fc_pci->init_state & FC_PCI_DMA_INIT) {
            flexcop_dma_free(&fc_pci->dma[0]);
            flexcop_dma_free(&fc_pci->dma[1]);
      }
      fc_pci->init_state &= ~FC_PCI_DMA_INIT;
}

static int flexcop_pci_init(struct flexcop_pci *fc_pci)
{
      int ret;
      u8 card_rev;

      pci_read_config_byte(fc_pci->pdev, PCI_CLASS_REVISION, &card_rev);
      info("card revision %x", card_rev);

      if ((ret = pci_enable_device(fc_pci->pdev)) != 0)
            return ret;

      pci_set_master(fc_pci->pdev);

      /* enable interrupts */
      // pci_write_config_dword(pdev, 0x6c, 0x8000);

      if ((ret = pci_request_regions(fc_pci->pdev, DRIVER_NAME)) != 0)
            goto err_pci_disable_device;

      fc_pci->io_mem = pci_iomap(fc_pci->pdev, 0, 0x800);

      if (!fc_pci->io_mem) {
            err("cannot map io memory\n");
            ret = -EIO;
            goto err_pci_release_regions;
      }

      pci_set_drvdata(fc_pci->pdev, fc_pci);
      spin_lock_init(&fc_pci->irq_lock);
      if ((ret = request_irq(fc_pci->pdev->irq, flexcop_pci_isr,
                              IRQF_SHARED, DRIVER_NAME, fc_pci)) != 0)
            goto err_pci_iounmap;



      fc_pci->init_state |= FC_PCI_INIT;
      return ret;

err_pci_iounmap:
      pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
      pci_set_drvdata(fc_pci->pdev, NULL);
err_pci_release_regions:
      pci_release_regions(fc_pci->pdev);
err_pci_disable_device:
      pci_disable_device(fc_pci->pdev);
      return ret;
}

static void flexcop_pci_exit(struct flexcop_pci *fc_pci)
{
      if (fc_pci->init_state & FC_PCI_INIT) {
            free_irq(fc_pci->pdev->irq, fc_pci);
            pci_iounmap(fc_pci->pdev, fc_pci->io_mem);
            pci_set_drvdata(fc_pci->pdev, NULL);
            pci_release_regions(fc_pci->pdev);
            pci_disable_device(fc_pci->pdev);
      }
      fc_pci->init_state &= ~FC_PCI_INIT;
}


static int flexcop_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
      struct flexcop_device *fc;
      struct flexcop_pci *fc_pci;
      int ret = -ENOMEM;

      if ((fc = flexcop_device_kmalloc(sizeof(struct flexcop_pci))) == NULL) {
            err("out of memory\n");
            return -ENOMEM;
      }

/* general flexcop init */
      fc_pci = fc->bus_specific;
      fc_pci->fc_dev = fc;

      fc->read_ibi_reg = flexcop_pci_read_ibi_reg;
      fc->write_ibi_reg = flexcop_pci_write_ibi_reg;
      fc->i2c_request = flexcop_i2c_request;
      fc->get_mac_addr = flexcop_eeprom_check_mac_addr;

      fc->stream_control = flexcop_pci_stream_control;

      if (enable_pid_filtering)
            info("will use the HW PID filter.");
      else
            info("will pass the complete TS to the demuxer.");

      fc->pid_filtering = enable_pid_filtering;
      fc->bus_type = FC_PCI;

      fc->dev = &pdev->dev;
      fc->owner = THIS_MODULE;

/* bus specific part */
      fc_pci->pdev = pdev;
      if ((ret = flexcop_pci_init(fc_pci)) != 0)
            goto err_kfree;

/* init flexcop */
      if ((ret = flexcop_device_initialize(fc)) != 0)
            goto err_pci_exit;

/* init dma */
      if ((ret = flexcop_pci_dma_init(fc_pci)) != 0)
            goto err_fc_exit;

      INIT_DELAYED_WORK(&fc_pci->irq_check_work, flexcop_pci_irq_check_work);

      return ret;

err_fc_exit:
      flexcop_device_exit(fc);
err_pci_exit:
      flexcop_pci_exit(fc_pci);
err_kfree:
      flexcop_device_kfree(fc);
      return ret;
}

/* in theory every _exit function should be called exactly two times,
 * here and in the bail-out-part of the _init-function
 */
static void flexcop_pci_remove(struct pci_dev *pdev)
{
      struct flexcop_pci *fc_pci = pci_get_drvdata(pdev);

      flexcop_pci_dma_exit(fc_pci);
      flexcop_device_exit(fc_pci->fc_dev);
      flexcop_pci_exit(fc_pci);
      flexcop_device_kfree(fc_pci->fc_dev);
}

static struct pci_device_id flexcop_pci_tbl[] = {
      { PCI_DEVICE(0x13d0, 0x2103) },
/*    { PCI_DEVICE(0x13d0, 0x2200) }, ? */
      { },
};

MODULE_DEVICE_TABLE(pci, flexcop_pci_tbl);

static struct pci_driver flexcop_pci_driver = {
      .name     = "b2c2_flexcop_pci",
      .id_table = flexcop_pci_tbl,
      .probe    = flexcop_pci_probe,
      .remove   = flexcop_pci_remove,
};

static int __init flexcop_pci_module_init(void)
{
      return pci_register_driver(&flexcop_pci_driver);
}

static void __exit flexcop_pci_module_exit(void)
{
      pci_unregister_driver(&flexcop_pci_driver);
}

module_init(flexcop_pci_module_init);
module_exit(flexcop_pci_module_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_NAME);
MODULE_LICENSE("GPL");

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