drivers/media/dvb/b2c2/flexcop-dma.c

   1 /*
   2  * This file is part of linux driver the digital TV devices equipped with B2C2 FlexcopII(b)/III
   3  *
   4  * flexcop-dma.c - methods for configuring and controlling the DMA of the FlexCop.
   5  *
   6  * see flexcop.c for copyright information.
   7  */
   8 #include "flexcop.h"
   9
  10 int flexcop_dma_allocate(struct pci_dev *pdev, struct flexcop_dma *dma, u32 size)
  11 {
  12         u8 *tcpu;
  13         dma_addr_t tdma;
  14
  15         if (size % 2) {
  16                 err("dma buffersize has to be even.");
  17                 return -EINVAL;
  18         }
  19
  20         if ((tcpu = pci_alloc_consistent(pdev, size, &tdma)) != NULL) {
  21                 dma->pdev = pdev;
  22                 dma->cpu_addr0 = tcpu;
  23                 dma->dma_addr0 = tdma;
  24                 dma->cpu_addr1 = tcpu + size/2;
  25                 dma->dma_addr1 = tdma + size/2;
  26                 dma->size = size/2;
  27                 return 0;
  28         }
  29         return -ENOMEM;
  30 }
  31 EXPORT_SYMBOL(flexcop_dma_allocate);
  32
  33 void flexcop_dma_free(struct flexcop_dma *dma)
  34 {
  35         pci_free_consistent(dma->pdev, dma->size*2,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_control_timer_irq(struct flexcop_device *fc, flexcop_dma_index_t no, int onoff)
  41 {
  42         flexcop_ibi_value v = fc->read_ibi_reg(fc,ctrl_208);
  43
  44         if (no & FC_DMA_1)
  45                 v.ctrl_208.DMA1_Timer_Enable_sig = onoff;
  46
  47         if (no & FC_DMA_2)
  48                 v.ctrl_208.DMA2_Timer_Enable_sig = onoff;
  49
  50         fc->write_ibi_reg(fc,ctrl_208,v);
  51         return 0;
  52 }
  53 EXPORT_SYMBOL(flexcop_dma_control_timer_irq);
  54
  55 int flexcop_dma_control_size_irq(struct flexcop_device *fc, flexcop_dma_index_t no, int onoff)
  56 {
  57         flexcop_ibi_value v = fc->read_ibi_reg(fc,ctrl_208);
  58
  59         if (no & FC_DMA_1)
  60                 v.ctrl_208.DMA1_IRQ_Enable_sig = onoff;
  61
  62         if (no & FC_DMA_2)
  63                 v.ctrl_208.DMA2_IRQ_Enable_sig = onoff;
  64
  65         fc->write_ibi_reg(fc,ctrl_208,v);
  66         return 0;
  67 }
  68 EXPORT_SYMBOL(flexcop_dma_control_size_irq);
  69
  70 int flexcop_dma_control_packet_irq(struct flexcop_device *fc, flexcop_dma_index_t no, int onoff)
  71 {
  72         flexcop_ibi_value v = fc->read_ibi_reg(fc,ctrl_208);
  73
  74         if (no & FC_DMA_1)
  75                 v.ctrl_208.DMA1_Size_IRQ_Enable_sig = onoff;
  76
  77         if (no & FC_DMA_2)
  78                 v.ctrl_208.DMA2_Size_IRQ_Enable_sig = onoff;
  79
  80         fc->write_ibi_reg(fc,ctrl_208,v);
  81         return 0;
  82 }
  83 EXPORT_SYMBOL(flexcop_dma_control_packet_irq);
  84
  85 int flexcop_dma_config(struct flexcop_device *fc, struct flexcop_dma *dma, flexcop_dma_index_t dma_idx,flexcop_dma_addr_index_t index)
  86 {
  87
  88         flexcop_ibi_value v0x0,v0x4,v0xc;
  89         v0x0.raw = v0x4.raw = v0xc.raw = 0;
  90
  91         v0x0.dma_0x0.dma_address0        = dma->dma_addr0 >> 2;
  92         v0xc.dma_0xc.dma_address1        = dma->dma_addr1 >> 2;
  93         v0x4.dma_0x4_write.dma_addr_size = dma->size / 4;
  94
  95         if (index & FC_DMA_SUBADDR_0)
  96                 v0x0.dma_0x0.dma_0start = 1;
  97
  98         if (index & FC_DMA_SUBADDR_1)
  99                 v0xc.dma_0xc.dma_1start = 1;
 100
 101         if (dma_idx & FC_DMA_1) {
 102                 fc->write_ibi_reg(fc,dma1_000,v0x0);
 103                 fc->write_ibi_reg(fc,dma1_004,v0x4);
 104                 fc->write_ibi_reg(fc,dma1_00c,v0xc);
 105         } else { /* (dma_idx & FC_DMA_2) */
 106                 fc->write_ibi_reg(fc,dma2_010,v0x0);
 107                 fc->write_ibi_reg(fc,dma2_014,v0x4);
 108                 fc->write_ibi_reg(fc,dma2_01c,v0xc);
 109         }
 110
 111         return 0;
 112 }
 113 EXPORT_SYMBOL(flexcop_dma_config);
 114
 115 static int flexcop_dma_remap(struct flexcop_device *fc, flexcop_dma_index_t dma_idx, int onoff)
 116 {
 117         flexcop_ibi_register r = (dma_idx & FC_DMA_1) ? dma1_00c : dma2_01c;
 118         flexcop_ibi_value v = fc->read_ibi_reg(fc,r);
 119         v.dma_0xc.remap_enable = onoff;
 120         fc->write_ibi_reg(fc,r,v);
 121         return 0;
 122 }
 123
 124 /* 1 cycles = 1.97 msec */
 125 int flexcop_dma_config_timer(struct flexcop_device *fc, flexcop_dma_index_t dma_idx, u8 cycles)
 126 {
 127         flexcop_ibi_register r = (dma_idx & FC_DMA_1) ? dma1_004 : dma2_014;
 128         flexcop_ibi_value v = fc->read_ibi_reg(fc,r);
 129
 130         flexcop_dma_remap(fc,dma_idx,0);
 131
 132         v.dma_0x4_write.dmatimer = cycles >> 1;
 133         fc->write_ibi_reg(fc,r,v);
 134         return 0;
 135 }
 136 EXPORT_SYMBOL(flexcop_dma_config_timer);
 137
 138 int flexcop_dma_config_packet_count(struct flexcop_device *fc, flexcop_dma_index_t dma_idx, u8 packets)
 139 {
 140         flexcop_ibi_register r = (dma_idx & FC_DMA_1) ? dma1_004 : dma2_014;
 141         flexcop_ibi_value v = fc->read_ibi_reg(fc,r);
 142
 143         flexcop_dma_remap(fc,dma_idx,1);
 144
 145         v.dma_0x4_remap.DMA_maxpackets = packets;
 146         fc->write_ibi_reg(fc,r,v);
 147         return 0;
 148 }
 149 EXPORT_SYMBOL(flexcop_dma_config_packet_count);