1 /* 2 Mantis PCI bridge driver 3 4 Copyright (C) Manu Abraham (abraham.manu@gmail.com) 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 */ 20 21 #include <linux/kernel.h> 22 #include <asm/page.h> 23 #include <linux/vmalloc.h> 24 #include <linux/pci.h> 25 26 #include <asm/irq.h> 27 #include <linux/signal.h> 28 #include <linux/sched.h> 29 #include <linux/interrupt.h> 30 31 #include "dmxdev.h" 32 #include "dvbdev.h" 33 #include "dvb_demux.h" 34 #include "dvb_frontend.h" 35 #include "dvb_net.h" 36 37 #include "mantis_common.h" 38 #include "mantis_reg.h" 39 #include "mantis_dma.h" 40 41 #define RISC_WRITE (0x01 << 28) 42 #define RISC_JUMP (0x07 << 28) 43 #define RISC_IRQ (0x01 << 24) 44 45 #define RISC_STATUS(status) ((((~status) & 0x0f) << 20) | ((status & 0x0f) << 16)) 46 #define RISC_FLUSH(risc_pos) (risc_pos = 0) 47 #define RISC_INSTR(risc_pos, opcode) (mantis->risc_cpu[risc_pos++] = cpu_to_le32(opcode)) 48 49 #define MANTIS_BUF_SIZE (64 * 1024) 50 #define MANTIS_BLOCK_BYTES (MANTIS_BUF_SIZE / 4) 51 #define MANTIS_DMA_TR_BYTES (2 * 1024) /* upper limit: 4095 bytes. */ 52 #define MANTIS_BLOCK_COUNT (MANTIS_BUF_SIZE / MANTIS_BLOCK_BYTES) 53 54 #define MANTIS_DMA_TR_UNITS (MANTIS_BLOCK_BYTES / MANTIS_DMA_TR_BYTES) 55 /* MANTIS_BUF_SIZE / MANTIS_DMA_TR_UNITS must not exceed MANTIS_RISC_SIZE (4k RISC cmd buffer) */ 56 #define MANTIS_RISC_SIZE PAGE_SIZE /* RISC program must fit here. */ 57 58 int mantis_dma_exit(struct mantis_pci *mantis) 59 { 60 if (mantis->buf_cpu) { 61 dprintk(MANTIS_ERROR, 1, 62 "DMA=0x%lx cpu=0x%p size=%d", 63 (unsigned long) mantis->buf_dma, 64 mantis->buf_cpu, 65 MANTIS_BUF_SIZE); 66 67 pci_free_consistent(mantis->pdev, MANTIS_BUF_SIZE, 68 mantis->buf_cpu, mantis->buf_dma); 69 70 mantis->buf_cpu = NULL; 71 } 72 if (mantis->risc_cpu) { 73 dprintk(MANTIS_ERROR, 1, 74 "RISC=0x%lx cpu=0x%p size=%lx", 75 (unsigned long) mantis->risc_dma, 76 mantis->risc_cpu, 77 MANTIS_RISC_SIZE); 78 79 pci_free_consistent(mantis->pdev, MANTIS_RISC_SIZE, 80 mantis->risc_cpu, mantis->risc_dma); 81 82 mantis->risc_cpu = NULL; 83 } 84 85 return 0; 86 } 87 EXPORT_SYMBOL_GPL(mantis_dma_exit); 88 89 static inline int mantis_alloc_buffers(struct mantis_pci *mantis) 90 { 91 if (!mantis->buf_cpu) { 92 mantis->buf_cpu = pci_alloc_consistent(mantis->pdev, 93 MANTIS_BUF_SIZE, 94 &mantis->buf_dma); 95 if (!mantis->buf_cpu) { 96 dprintk(MANTIS_ERROR, 1, 97 "DMA buffer allocation failed"); 98 99 goto err; 100 } 101 dprintk(MANTIS_ERROR, 1, 102 "DMA=0x%lx cpu=0x%p size=%d", 103 (unsigned long) mantis->buf_dma, 104 mantis->buf_cpu, MANTIS_BUF_SIZE); 105 } 106 if (!mantis->risc_cpu) { 107 mantis->risc_cpu = pci_alloc_consistent(mantis->pdev, 108 MANTIS_RISC_SIZE, 109 &mantis->risc_dma); 110 111 if (!mantis->risc_cpu) { 112 dprintk(MANTIS_ERROR, 1, 113 "RISC program allocation failed"); 114 115 mantis_dma_exit(mantis); 116 117 goto err; 118 } 119 dprintk(MANTIS_ERROR, 1, 120 "RISC=0x%lx cpu=0x%p size=%lx", 121 (unsigned long) mantis->risc_dma, 122 mantis->risc_cpu, MANTIS_RISC_SIZE); 123 } 124 125 return 0; 126 err: 127 dprintk(MANTIS_ERROR, 1, "Out of memory (?) ....."); 128 return -ENOMEM; 129 } 130 131 int mantis_dma_init(struct mantis_pci *mantis) 132 { 133 int err; 134 135 dprintk(MANTIS_DEBUG, 1, "Mantis DMA init"); 136 err = mantis_alloc_buffers(mantis); 137 if (err < 0) { 138 dprintk(MANTIS_ERROR, 1, "Error allocating DMA buffer"); 139 140 /* Stop RISC Engine */ 141 mmwrite(0, MANTIS_DMA_CTL); 142 143 return err; 144 } 145 146 return 0; 147 } 148 EXPORT_SYMBOL_GPL(mantis_dma_init); 149 150 static inline void mantis_risc_program(struct mantis_pci *mantis) 151 { 152 u32 buf_pos = 0; 153 u32 line, step; 154 u32 risc_pos; 155 156 dprintk(MANTIS_DEBUG, 1, "Mantis create RISC program"); 157 RISC_FLUSH(risc_pos); 158 159 dprintk(MANTIS_DEBUG, 1, "risc len lines %u, bytes per line %u, bytes per DMA tr %u", 160 MANTIS_BLOCK_COUNT, MANTIS_BLOCK_BYTES, MANTIS_DMA_TR_BYTES); 161 162 for (line = 0; line < MANTIS_BLOCK_COUNT; line++) { 163 for (step = 0; step < MANTIS_DMA_TR_UNITS; step++) { 164 dprintk(MANTIS_DEBUG, 1, "RISC PROG line=[%d], step=[%d]", line, step); 165 if (step == 0) { 166 RISC_INSTR(risc_pos, RISC_WRITE | 167 RISC_IRQ | 168 RISC_STATUS(line) | 169 MANTIS_DMA_TR_BYTES); 170 } else { 171 RISC_INSTR(risc_pos, RISC_WRITE | MANTIS_DMA_TR_BYTES); 172 } 173 RISC_INSTR(risc_pos, mantis->buf_dma + buf_pos); 174 buf_pos += MANTIS_DMA_TR_BYTES; 175 } 176 } 177 RISC_INSTR(risc_pos, RISC_JUMP); 178 RISC_INSTR(risc_pos, mantis->risc_dma); 179 } 180 181 void mantis_dma_start(struct mantis_pci *mantis) 182 { 183 dprintk(MANTIS_DEBUG, 1, "Mantis Start DMA engine"); 184 185 mantis_risc_program(mantis); 186 mmwrite(mantis->risc_dma, MANTIS_RISC_START); 187 mmwrite(mmread(MANTIS_GPIF_ADDR) | MANTIS_GPIF_HIFRDWRN, MANTIS_GPIF_ADDR); 188 189 mmwrite(0, MANTIS_DMA_CTL); 190 mantis->last_block = mantis->busy_block = 0; 191 192 mantis_unmask_ints(mantis, MANTIS_INT_RISCI); 193 194 mmwrite(MANTIS_FIFO_EN | MANTIS_DCAP_EN 195 | MANTIS_RISC_EN, MANTIS_DMA_CTL); 196 197 } 198 199 void mantis_dma_stop(struct mantis_pci *mantis) 200 { 201 dprintk(MANTIS_DEBUG, 1, "Mantis Stop DMA engine"); 202 203 mmwrite((mmread(MANTIS_GPIF_ADDR) & (~(MANTIS_GPIF_HIFRDWRN))), MANTIS_GPIF_ADDR); 204 205 mmwrite((mmread(MANTIS_DMA_CTL) & ~(MANTIS_FIFO_EN | 206 MANTIS_DCAP_EN | 207 MANTIS_RISC_EN)), MANTIS_DMA_CTL); 208 209 mmwrite(mmread(MANTIS_INT_STAT), MANTIS_INT_STAT); 210 211 mantis_mask_ints(mantis, MANTIS_INT_RISCI | MANTIS_INT_RISCEN); 212 } 213 214 215 void mantis_dma_xfer(unsigned long data) 216 { 217 struct mantis_pci *mantis = (struct mantis_pci *) data; 218 struct mantis_hwconfig *config = mantis->hwconfig; 219 220 while (mantis->last_block != mantis->busy_block) { 221 dprintk(MANTIS_DEBUG, 1, "last block=[%d] finished block=[%d]", 222 mantis->last_block, mantis->busy_block); 223 224 (config->ts_size ? dvb_dmx_swfilter_204 : dvb_dmx_swfilter) 225 (&mantis->demux, &mantis->buf_cpu[mantis->last_block * MANTIS_BLOCK_BYTES], MANTIS_BLOCK_BYTES); 226 mantis->last_block = (mantis->last_block + 1) % MANTIS_BLOCK_COUNT; 227 } 228 } 229