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); 171 172