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); 172 173