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 flexcop_dma_config call."); 61 return -EINVAL; 62 } 63 64 return 0; 65 } 66 EXPORT_SYMBOL(flexcop_dma_config); 67 68 /* start the DMA transfers, but not the DMA IRQs */ 69 int flexcop_dma_xfer_control(struct flexcop_device *fc, 70 flexcop_dma_index_t dma_idx, 71 flexcop_dma_addr_index_t index, 72 int onoff) 73 { 74 flexcop_ibi_value v0x0,v0xc; 75 flexcop_ibi_register r0x0,r0xc; 76 77 if ((dma_idx & FC_DMA_1) == dma_idx) { 78 r0x0 = dma1_000; 79 r0xc = dma1_00c; 80 } else if ((dma_idx & FC_DMA_2) == dma_idx) { 81 r0x0 = dma2_010; 82 r0xc = dma2_01c; 83 } else { 84 err("either transfer DMA1 or DMA2 can be started within one flexcop_dma_xfer_control call."); 85 return -EINVAL; 86 } 87 88 v0x0 = fc->read_ibi_reg(fc,r0x0); 89 v0xc = fc->read_ibi_reg(fc,r0xc); 90 91 deb_rdump("reg: %03x: %x\n",r0x0,v0x0.raw); 92 deb_rdump("reg: %03x: %x\n",r0xc,v0xc.raw); 93 94 if (index & FC_DMA_SUBADDR_0) 95 v0x0.dma_0x0.dma_0start = onoff; 96 97 if (index & FC_DMA_SUBADDR_1) 98 v0xc.dma_0xc.dma_1start = onoff; 99 100 fc->write_ibi_reg(fc,r0x0,v0x0); 101 fc->write_ibi_reg(fc,r0xc,v0xc); 102 103 deb_rdump("reg: %03x: %x\n",r0x0,v0x0.raw); 104 deb_rdump("reg: %03x: %x\n",r0xc,v0xc.raw); 105 return 0; 106 } 107 EXPORT_SYMBOL(flexcop_dma_xfer_control); 108 109 static int flexcop_dma_remap(struct flexcop_device *fc, 110 flexcop_dma_index_t dma_idx, 111 int onoff) 112 { 113 flexcop_ibi_register r = (dma_idx & FC_DMA_1) ? dma1_00c : dma2_01c; 114 flexcop_ibi_value v = fc->read_ibi_reg(fc,r); 115 deb_info("%s\n",__func__); 116 v.dma_0xc.remap_enable = onoff; 117 fc->write_ibi_reg(fc,r,v); 118 return 0; 119 } 120 121 int flexcop_dma_control_size_irq(struct flexcop_device *fc, 122 flexcop_dma_index_t no, 123 int onoff) 124 { 125 flexcop_ibi_value v = fc->read_ibi_reg(fc,ctrl_208); 126 127 if (no & FC_DMA_1) 128 v.ctrl_208.DMA1_IRQ_Enable_sig = onoff; 129 130 if (no & FC_DMA_2) 131 v.ctrl_208.DMA2_IRQ_Enable_sig = onoff; 132 133 fc->write_ibi_reg(fc,ctrl_208,v); 134 return 0; 135 } 136 EXPORT_SYMBOL(flexcop_dma_control_size_irq); 137 138 int flexcop_dma_control_timer_irq(struct flexcop_device *fc, 139 flexcop_dma_index_t no, 140 int onoff) 141 { 142 flexcop_ibi_value v = fc->read_ibi_reg(fc,ctrl_208); 143 144 if (no & FC_DMA_1) 145 v.ctrl_208.DMA1_Timer_Enable_sig = onoff; 146 147 if (no & FC_DMA_2) 148 v.ctrl_208.DMA2_Timer_Enable_sig = onoff; 149 150 fc->write_ibi_reg(fc,ctrl_208,v); 151 return 0; 152 } 153 EXPORT_SYMBOL(flexcop_dma_control_timer_irq); 154 155 /* 1 cycles = 1.97 msec */ 156 int flexcop_dma_config_timer(struct flexcop_device *fc, 157 flexcop_dma_index_t dma_idx, u8 cycles) 158 { 159 flexcop_ibi_register r = (dma_idx & FC_DMA_1) ? dma1_004 : dma2_014; 160 flexcop_ibi_value v = fc->read_ibi_reg(fc,r); 161 162 flexcop_dma_remap(fc,dma_idx,0); 163 164 deb_info("%s\n",__func__); 165 v.dma_0x4_write.dmatimer = cycles; 166 fc->write_ibi_reg(fc,r,v); 167 return 0; 168 } 169 EXPORT_SYMBOL(flexcop_dma_config_timer); 170 171