kernel/drivers/media/pci/b2c2/flexcop-dma.c

   1 /*
   2  * Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III
   3  * flexcop-dma.c - configuring and controlling the DMA of the FlexCop
   4  * see flexcop.c for copyright information
   5  */
   6 #include "flexcop.h"
   7
   8 int flexcop_dma_allocate(struct pci_dev *pdev,
   9                 struct flexcop_dma *dma, u32 size)
  10 {
  11         u8 *tcpu;
  12         dma_addr_t tdma = 0;
  13
  14         if (size % 2) {
  15                 err("dma buffersize has to be even.");
  16                 return -EINVAL;
  17         }
  18
  19         if ((tcpu = pci_alloc_consistent(pdev, size, &tdma)) != NULL) {
  20                 dma->pdev = pdev;
  21                 dma->cpu_addr0 = tcpu;
  22                 dma->dma_addr0 = tdma;
  23                 dma->cpu_addr1 = tcpu + size/2;
  24                 dma->dma_addr1 = tdma + size/2;
  25                 dma->size = size/2;
  26                 return 0;
  27         }
  28         return -ENOMEM;
  29 }
  30 EXPORT_SYMBOL(flexcop_dma_allocate);
  31
  32 void flexcop_dma_free(struct flexcop_dma *dma)
  33 {
  34         pci_free_consistent(dma->pdev, dma->size*2,
  35                         dma->cpu_addr0, dma->dma_addr0);
  36         memset(dma,0,sizeof(struct flexcop_dma));
  37 }
  38 EXPORT_SYMBOL(flexcop_dma_free);
  39
  40 int flexcop_dma_config(struct flexcop_device *fc,
  41                 struct flexcop_dma *dma,
  42                 flexcop_dma_index_t dma_idx)
  43 {
  44         flexcop_ibi_value v0x0,v0x4,v0xc;
  45         v0x0.raw = v0x4.raw = v0xc.raw = 0;
  46
  47         v0x0.dma_0x0.dma_address0 = dma->dma_addr0 >> 2;
  48         v0xc.dma_0xc.dma_address1 = dma->dma_addr1 >> 2;
  49         v0x4.dma_0x4_write.dma_addr_size = dma->size / 4;
  50
  51         if ((dma_idx & FC_DMA_1) == dma_idx) {
  52                 fc->write_ibi_reg(fc,dma1_000,v0x0);
  53                 fc->write_ibi_reg(fc,dma1_004,v0x4);
  54                 fc->write_ibi_reg(fc,dma1_00c,v0xc);
  55         } else if ((dma_idx & FC_DMA_2) == dma_idx) {
  56                 fc->write_ibi_reg(fc,dma2_010,v0x0);
  57                 fc->write_ibi_reg(fc,dma2_014,v0x4);
  58                 fc->write_ibi_reg(fc,dma2_01c,v0xc);
  59         } else {
  60                 err("either DMA1 or DMA2 can be configured within one "
  61                         "flexcop_dma_config call.");
  62                 return -EINVAL;
  63         }
  64
  65         return 0;
  66 }
  67 EXPORT_SYMBOL(flexcop_dma_config);
  68
  69 /* start the DMA transfers, but not the DMA IRQs */
  70 int flexcop_dma_xfer_control(struct flexcop_device *fc,
  71                 flexcop_dma_index_t dma_idx,
  72                 flexcop_dma_addr_index_t index,
  73                 int onoff)
  74 {
  75         flexcop_ibi_value v0x0,v0xc;
  76         flexcop_ibi_register r0x0,r0xc;
  77
  78         if ((dma_idx & FC_DMA_1) == dma_idx) {
  79                 r0x0 = dma1_000;
  80                 r0xc = dma1_00c;
  81         } else if ((dma_idx & FC_DMA_2) == dma_idx) {
  82                 r0x0 = dma2_010;
  83                 r0xc = dma2_01c;
  84         } else {
  85                 err("either transfer DMA1 or DMA2 can be started within one "
  86                         "flexcop_dma_xfer_control call.");
  87                 return -EINVAL;
  88         }
  89
  90         v0x0 = fc->read_ibi_reg(fc,r0x0);
  91         v0xc = fc->read_ibi_reg(fc,r0xc);
  92
  93         deb_rdump("reg: %03x: %x\n",r0x0,v0x0.raw);
  94         deb_rdump("reg: %03x: %x\n",r0xc,v0xc.raw);
  95
  96         if (index & FC_DMA_SUBADDR_0)
  97                 v0x0.dma_0x0.dma_0start = onoff;
  98
  99         if (index & FC_DMA_SUBADDR_1)
 100                 v0xc.dma_0xc.dma_1start = onoff;
 101
 102         fc->write_ibi_reg(fc,r0x0,v0x0);
 103         fc->write_ibi_reg(fc,r0xc,v0xc);
 104
 105         deb_rdump("reg: %03x: %x\n",r0x0,v0x0.raw);
 106         deb_rdump("reg: %03x: %x\n",r0xc,v0xc.raw);
 107         return 0;
 108 }
 109 EXPORT_SYMBOL(flexcop_dma_xfer_control);
 110
 111 static int flexcop_dma_remap(struct flexcop_device *fc,
 112                 flexcop_dma_index_t dma_idx,
 113                 int onoff)
 114 {
 115         flexcop_ibi_register r = (dma_idx & FC_DMA_1) ? dma1_00c : dma2_01c;
 116         flexcop_ibi_value v = fc->read_ibi_reg(fc,r);
 117         deb_info("%s\n",__func__);
 118         v.dma_0xc.remap_enable = onoff;
 119         fc->write_ibi_reg(fc,r,v);
 120         return 0;
 121 }
 122
 123 int flexcop_dma_control_size_irq(struct flexcop_device *fc,
 124                 flexcop_dma_index_t no,
 125                 int onoff)
 126 {
 127         flexcop_ibi_value v = fc->read_ibi_reg(fc,ctrl_208);
 128
 129         if (no & FC_DMA_1)
 130                 v.ctrl_208.DMA1_IRQ_Enable_sig = onoff;
 131
 132         if (no & FC_DMA_2)
 133                 v.ctrl_208.DMA2_IRQ_Enable_sig = onoff;
 134
 135         fc->write_ibi_reg(fc,ctrl_208,v);
 136         return 0;
 137 }
 138 EXPORT_SYMBOL(flexcop_dma_control_size_irq);
 139
 140 int flexcop_dma_control_timer_irq(struct flexcop_device *fc,
 141                 flexcop_dma_index_t no,
 142                 int onoff)
 143 {
 144         flexcop_ibi_value v = fc->read_ibi_reg(fc,ctrl_208);
 145
 146         if (no & FC_DMA_1)
 147                 v.ctrl_208.DMA1_Timer_Enable_sig = onoff;
 148
 149         if (no & FC_DMA_2)
 150                 v.ctrl_208.DMA2_Timer_Enable_sig = onoff;
 151
 152         fc->write_ibi_reg(fc,ctrl_208,v);
 153         return 0;
 154 }
 155 EXPORT_SYMBOL(flexcop_dma_control_timer_irq);
 156
 157 /* 1 cycles = 1.97 msec */
 158 int flexcop_dma_config_timer(struct flexcop_device *fc,
 159                 flexcop_dma_index_t dma_idx, u8 cycles)
 160 {
 161         flexcop_ibi_register r = (dma_idx & FC_DMA_1) ? dma1_004 : dma2_014;
 162         flexcop_ibi_value v = fc->read_ibi_reg(fc,r);
 163
 164         flexcop_dma_remap(fc,dma_idx,0);
 165
 166         deb_info("%s\n",__func__);
 167         v.dma_0x4_write.dmatimer = cycles;
 168         fc->write_ibi_reg(fc,r,v);
 169         return 0;
 170 }
 171 EXPORT_SYMBOL(flexcop_dma_config_timer);
 172