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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III
   4  * flexcop-dma.c - configuring and controlling the DMA of the FlexCop
   5  * see flexcop.c for copyright information
   6  */
   7 #include "flexcop.h"
   8
   9 int flexcop_dma_allocate(struct pci_dev *pdev,
  10                 struct flexcop_dma *dma, u32 size)
  11 {
  12         u8 *tcpu;
  13         dma_addr_t tdma = 0;
  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,
  36                         dma->cpu_addr0, dma->dma_addr0);
  37         memset(dma,0,sizeof(struct flexcop_dma));
  38 }
  39 EXPORT_SYMBOL(flexcop_dma_free);
  40
  41 int flexcop_dma_config(struct flexcop_device *fc,
  42                 struct flexcop_dma *dma,
  43                 flexcop_dma_index_t dma_idx)
  44 {
  45         flexcop_ibi_value v0x0,v0x4,v0xc;
  46         v0x0.raw = v0x4.raw = v0xc.raw = 0;
  47
  48         v0x0.dma_0x0.dma_address0 = dma->dma_addr0 >> 2;
  49         v0xc.dma_0xc.dma_address1 = dma->dma_addr1 >> 2;
  50         v0x4.dma_0x4_write.dma_addr_size = dma->size / 4;
  51
  52         if ((dma_idx & FC_DMA_1) == dma_idx) {
  53                 fc->write_ibi_reg(fc,dma1_000,v0x0);
  54                 fc->write_ibi_reg(fc,dma1_004,v0x4);
  55                 fc->write_ibi_reg(fc,dma1_00c,v0xc);
  56         } else if ((dma_idx & FC_DMA_2) == dma_idx) {
  57                 fc->write_ibi_reg(fc,dma2_010,v0x0);
  58                 fc->write_ibi_reg(fc,dma2_014,v0x4);
  59                 fc->write_ibi_reg(fc,dma2_01c,v0xc);
  60         } else {
  61                 err("either DMA1 or DMA2 can be configured within one 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 flexcop_dma_xfer_control call.");
  86                 return -EINVAL;
  87         }
  88
  89         v0x0 = fc->read_ibi_reg(fc,r0x0);
  90         v0xc = fc->read_ibi_reg(fc,r0xc);
  91
  92         deb_rdump("reg: %03x: %x\n",r0x0,v0x0.raw);
  93         deb_rdump("reg: %03x: %x\n",r0xc,v0xc.raw);
  94
  95         if (index & FC_DMA_SUBADDR_0)
  96                 v0x0.dma_0x0.dma_0start = onoff;
  97
  98         if (index & FC_DMA_SUBADDR_1)
  99                 v0xc.dma_0xc.dma_1start = onoff;
 100
 101         fc->write_ibi_reg(fc,r0x0,v0x0);
 102         fc->write_ibi_reg(fc,r0xc,v0xc);
 103
 104         deb_rdump("reg: %03x: %x\n",r0x0,v0x0.raw);
 105         deb_rdump("reg: %03x: %x\n",r0xc,v0xc.raw);
 106         return 0;
 107 }
 108 EXPORT_SYMBOL(flexcop_dma_xfer_control);
 109
 110 static int flexcop_dma_remap(struct flexcop_device *fc,
 111                 flexcop_dma_index_t dma_idx,
 112                 int onoff)
 113 {
 114         flexcop_ibi_register r = (dma_idx & FC_DMA_1) ? dma1_00c : dma2_01c;
 115         flexcop_ibi_value v = fc->read_ibi_reg(fc,r);
 116         deb_info("%s\n",__func__);
 117         v.dma_0xc.remap_enable = onoff;
 118         fc->write_ibi_reg(fc,r,v);
 119         return 0;
 120 }
 121
 122 int flexcop_dma_control_size_irq(struct flexcop_device *fc,
 123                 flexcop_dma_index_t no,
 124                 int onoff)
 125 {
 126         flexcop_ibi_value v = fc->read_ibi_reg(fc,ctrl_208);
 127
 128         if (no & FC_DMA_1)
 129                 v.ctrl_208.DMA1_IRQ_Enable_sig = onoff;
 130
 131         if (no & FC_DMA_2)
 132                 v.ctrl_208.DMA2_IRQ_Enable_sig = onoff;
 133
 134         fc->write_ibi_reg(fc,ctrl_208,v);
 135         return 0;
 136 }
 137 EXPORT_SYMBOL(flexcop_dma_control_size_irq);
 138
 139 int flexcop_dma_control_timer_irq(struct flexcop_device *fc,
 140                 flexcop_dma_index_t no,
 141                 int onoff)
 142 {
 143         flexcop_ibi_value v = fc->read_ibi_reg(fc,ctrl_208);
 144
 145         if (no & FC_DMA_1)
 146                 v.ctrl_208.DMA1_Timer_Enable_sig = onoff;
 147
 148         if (no & FC_DMA_2)
 149                 v.ctrl_208.DMA2_Timer_Enable_sig = onoff;
 150
 151         fc->write_ibi_reg(fc,ctrl_208,v);
 152         return 0;
 153 }
 154 EXPORT_SYMBOL(flexcop_dma_control_timer_irq);
 155
 156 /* 1 cycles = 1.97 msec */
 157 int flexcop_dma_config_timer(struct flexcop_device *fc,
 158                 flexcop_dma_index_t dma_idx, u8 cycles)
 159 {
 160         flexcop_ibi_register r = (dma_idx & FC_DMA_1) ? dma1_004 : dma2_014;
 161         flexcop_ibi_value v = fc->read_ibi_reg(fc,r);
 162
 163         flexcop_dma_remap(fc,dma_idx,0);
 164
 165         deb_info("%s\n",__func__);
 166         v.dma_0x4_write.dmatimer = cycles;
 167         fc->write_ibi_reg(fc,r,v);
 168         return 0;
 169 }
 170 EXPORT_SYMBOL(flexcop_dma_config_timer);
 171