1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 Mantis PCI bridge driver 4 5 Copyright (C) Manu Abraham (abraham.manu@gmail.com) 6 7 */ 8 9 #include <linux/kernel.h> 10 #include <asm/page.h> 11 #include <linux/vmalloc.h> 12 #include <linux/pci.h> 13 14 #include <asm/irq.h> 15 #include <linux/signal.h> 16 #include <linux/sched.h> 17 #include <linux/interrupt.h> 18 19 #include <media/dmxdev.h> 20 #include <media/dvbdev.h> 21 #include <media/dvb_demux.h> 22 #include <media/dvb_frontend.h> 23 #include <media/dvb_net.h> 24 25 #include "mantis_common.h" 26 #include "mantis_reg.h" 27 #include "mantis_dma.h" 28 29 #define RISC_WRITE (0x01 << 28) 30 #define RISC_JUMP (0x07 << 28) 31 #define RISC_IRQ (0x01 << 24) 32 33 #define RISC_STATUS(status) ((((~status) & 0x0f) << 20) | ((status & 0x0f) << 16)) 34 #define RISC_FLUSH(risc_pos) (risc_pos = 0) 35 #define RISC_INSTR(risc_pos, opcode) (mantis->risc_cpu[risc_pos++] = cpu_to_le32(opcode)) 36 37 #define MANTIS_BUF_SIZE (64 * 1024) 38 #define MANTIS_BLOCK_BYTES (MANTIS_BUF_SIZE / 4) 39 #define MANTIS_DMA_TR_BYTES (2 * 1024) /* upper limit: 4095 bytes. */ 40 #define MANTIS_BLOCK_COUNT (MANTIS_BUF_SIZE / MANTIS_BLOCK_BYTES) 41 42 #define MANTIS_DMA_TR_UNITS (MANTIS_BLOCK_BYTES / MANTIS_DMA_TR_BYTES) 43 /* MANTIS_BUF_SIZE / MANTIS_DMA_TR_UNITS must not exceed MANTIS_RISC_SIZE (4k RISC cmd buffer) */ 44 #define MANTIS_RISC_SIZE PAGE_SIZE /* RISC program must fit here. */ 45 46 int mantis_dma_exit(struct mantis_pci *mantis) 47 { 48 if (mantis->buf_cpu) { 49 dprintk(MANTIS_ERROR, 1, 50 "DMA=0x%lx cpu=0x%p size=%d", 51 (unsigned long) mantis->buf_dma, 52 mantis->buf_cpu, 53 MANTIS_BUF_SIZE); 54 55 dma_free_coherent(&mantis->pdev->dev, MANTIS_BUF_SIZE, 56 mantis->buf_cpu, mantis->buf_dma); 57 58 mantis->buf_cpu = NULL; 59 } 60 if (mantis->risc_cpu) { 61 dprintk(MANTIS_ERROR, 1, 62 "RISC=0x%lx cpu=0x%p size=%lx", 63 (unsigned long) mantis->risc_dma, 64 mantis->risc_cpu, 65 MANTIS_RISC_SIZE); 66 67 dma_free_coherent(&mantis->pdev->dev, MANTIS_RISC_SIZE, 68 mantis->risc_cpu, mantis->risc_dma); 69 70 mantis->risc_cpu = NULL; 71 } 72 73 return 0; 74 } 75 EXPORT_SYMBOL_GPL(mantis_dma_exit); 76 77 static inline int mantis_alloc_buffers(struct mantis_pci *mantis) 78 { 79 if (!mantis->buf_cpu) { 80 mantis->buf_cpu = dma_alloc_coherent(&mantis->pdev->dev, 81 MANTIS_BUF_SIZE, 82 &mantis->buf_dma, GFP_KERNEL); 83 if (!mantis->buf_cpu) { 84 dprintk(MANTIS_ERROR, 1, 85 "DMA buffer allocation failed"); 86 87 goto err; 88 } 89 dprintk(MANTIS_ERROR, 1, 90 "DMA=0x%lx cpu=0x%p size=%d", 91 (unsigned long) mantis->buf_dma, 92 mantis->buf_cpu, MANTIS_BUF_SIZE); 93 } 94 if (!mantis->risc_cpu) { 95 mantis->risc_cpu = dma_alloc_coherent(&mantis->pdev->dev, 96 MANTIS_RISC_SIZE, 97 &mantis->risc_dma, GFP_KERNEL); 98 99 if (!mantis->risc_cpu) { 100 dprintk(MANTIS_ERROR, 1, 101 "RISC program allocation failed"); 102 103 mantis_dma_exit(mantis); 104 105 goto err; 106 } 107 dprintk(MANTIS_ERROR, 1, 108 "RISC=0x%lx cpu=0x%p size=%lx", 109 (unsigned long) mantis->risc_dma, 110 mantis->risc_cpu, MANTIS_RISC_SIZE); 111 } 112 113 return 0; 114 err: 115 dprintk(MANTIS_ERROR, 1, "Out of memory (?) ....."); 116 return -ENOMEM; 117 } 118 119 int mantis_dma_init(struct mantis_pci *mantis) 120 { 121 int err; 122 123 dprintk(MANTIS_DEBUG, 1, "Mantis DMA init"); 124 err = mantis_alloc_buffers(mantis); 125 if (err < 0) { 126 dprintk(MANTIS_ERROR, 1, "Error allocating DMA buffer"); 127 128 /* Stop RISC Engine */ 129 mmwrite(0, MANTIS_DMA_CTL); 130 131 return err; 132 } 133 134 return 0; 135 } 136 EXPORT_SYMBOL_GPL(mantis_dma_init); 137 138 static inline void mantis_risc_program(struct mantis_pci *mantis) 139 { 140 u32 buf_pos = 0; 141 u32 line, step; 142 u32 risc_pos; 143 144 dprintk(MANTIS_DEBUG, 1, "Mantis create RISC program"); 145 RISC_FLUSH(risc_pos); 146 147 dprintk(MANTIS_DEBUG, 1, "risc len lines %u, bytes per line %u, bytes per DMA tr %u", 148 MANTIS_BLOCK_COUNT, MANTIS_BLOCK_BYTES, MANTIS_DMA_TR_BYTES); 149 150 for (line = 0; line < MANTIS_BLOCK_COUNT; line++) { 151 for (step = 0; step < MANTIS_DMA_TR_UNITS; step++) { 152 dprintk(MANTIS_DEBUG, 1, "RISC PROG line=[%d], step=[%d]", line, step); 153 if (step == 0) { 154 RISC_INSTR(risc_pos, RISC_WRITE | 155 RISC_IRQ | 156 RISC_STATUS(line) | 157 MANTIS_DMA_TR_BYTES); 158 } else { 159 RISC_INSTR(risc_pos, RISC_WRITE | MANTIS_DMA_TR_BYTES); 160 } 161 RISC_INSTR(risc_pos, mantis->buf_dma + buf_pos); 162 buf_pos += MANTIS_DMA_TR_BYTES; 163 } 164 } 165 RISC_INSTR(risc_pos, RISC_JUMP); 166 RISC_INSTR(risc_pos, mantis->risc_dma); 167 } 168 169 void mantis_dma_start(struct mantis_pci *mantis) 170 { 171 dprintk(MANTIS_DEBUG, 1, "Mantis Start DMA engine"); 172 173 mantis_risc_program(mantis); 174 mmwrite(mantis->risc_dma, MANTIS_RISC_START); 175 mmwrite(mmread(MANTIS_GPIF_ADDR) | MANTIS_GPIF_HIFRDWRN, MANTIS_GPIF_ADDR); 176 177 mmwrite(0, MANTIS_DMA_CTL); 178 mantis->last_block = mantis->busy_block = 0; 179 180 mantis_unmask_ints(mantis, MANTIS_INT_RISCI); 181 182 mmwrite(MANTIS_FIFO_EN | MANTIS_DCAP_EN 183 | MANTIS_RISC_EN, MANTIS_DMA_CTL); 184 185 } 186 187 void mantis_dma_stop(struct mantis_pci *mantis) 188 { 189 dprintk(MANTIS_DEBUG, 1, "Mantis Stop DMA engine"); 190 191 mmwrite((mmread(MANTIS_GPIF_ADDR) & (~(MANTIS_GPIF_HIFRDWRN))), MANTIS_GPIF_ADDR); 192 193 mmwrite((mmread(MANTIS_DMA_CTL) & ~(MANTIS_FIFO_EN | 194 MANTIS_DCAP_EN | 195 MANTIS_RISC_EN)), MANTIS_DMA_CTL); 196 197 mmwrite(mmread(MANTIS_INT_STAT), MANTIS_INT_STAT); 198 199 mantis_mask_ints(mantis, MANTIS_INT_RISCI | MANTIS_INT_RISCEN); 200 } 201 202 203 void mantis_dma_xfer(struct tasklet_struct *t) 204 { 205 struct mantis_pci *mantis = from_tasklet(mantis, t, tasklet); 206 struct mantis_hwconfig *config = mantis->hwconfig; 207 208 while (mantis->last_block != mantis->busy_block) { 209 dprintk(MANTIS_DEBUG, 1, "last block=[%d] finished block=[%d]", 210 mantis->last_block, mantis->busy_block); 211 212 (config->ts_size ? dvb_dmx_swfilter_204 : dvb_dmx_swfilter) 213 (&mantis->demux, &mantis->buf_cpu[mantis->last_block * MANTIS_BLOCK_BYTES], MANTIS_BLOCK_BYTES); 214 mantis->last_block = (mantis->last_block + 1) % MANTIS_BLOCK_COUNT; 215 } 216 } 217