drivers/media/dvb/mantis/mantis_dma.c

   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()            (mantis->risc_pos = 0)
  47 #define RISC_INSTR(opcode)      (mantis->risc_cpu[mantis->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_BLOCK_COUNT      (1 << 4)
  52 #define MANTIS_RISC_SIZE        PAGE_SIZE
  53
  54 int mantis_dma_exit(struct mantis_pci *mantis)
  55 {
  56         if (mantis->buf_cpu) {
  57                 dprintk(MANTIS_ERROR, 1,
  58                         "DMA=0x%lx cpu=0x%p size=%d",
  59                         (unsigned long) mantis->buf_dma,
  60                          mantis->buf_cpu,
  61                          MANTIS_BUF_SIZE);
  62
  63                 pci_free_consistent(mantis->pdev, MANTIS_BUF_SIZE,
  64                                     mantis->buf_cpu, mantis->buf_dma);
  65
  66                 mantis->buf_cpu = NULL;
  67         }
  68         if (mantis->risc_cpu) {
  69                 dprintk(MANTIS_ERROR, 1,
  70                         "RISC=0x%lx cpu=0x%p size=%lx",
  71                         (unsigned long) mantis->risc_dma,
  72                         mantis->risc_cpu,
  73                         MANTIS_RISC_SIZE);
  74
  75                 pci_free_consistent(mantis->pdev, MANTIS_RISC_SIZE,
  76                                     mantis->risc_cpu, mantis->risc_dma);
  77
  78                 mantis->risc_cpu = NULL;
  79         }
  80
  81         return 0;
  82 }
  83 EXPORT_SYMBOL_GPL(mantis_dma_exit);
  84
  85 static inline int mantis_alloc_buffers(struct mantis_pci *mantis)
  86 {
  87         if (!mantis->buf_cpu) {
  88                 mantis->buf_cpu = pci_alloc_consistent(mantis->pdev,
  89                                                        MANTIS_BUF_SIZE,
  90                                                        &mantis->buf_dma);
  91                 if (!mantis->buf_cpu) {
  92                         dprintk(MANTIS_ERROR, 1,
  93                                 "DMA buffer allocation failed");
  94
  95                         goto err;
  96                 }
  97                 dprintk(MANTIS_ERROR, 1,
  98                         "DMA=0x%lx cpu=0x%p size=%d",
  99                         (unsigned long) mantis->buf_dma,
 100                         mantis->buf_cpu, MANTIS_BUF_SIZE);
 101         }
 102         if (!mantis->risc_cpu) {
 103                 mantis->risc_cpu = pci_alloc_consistent(mantis->pdev,
 104                                                         MANTIS_RISC_SIZE,
 105                                                         &mantis->risc_dma);
 106
 107                 if (!mantis->risc_cpu) {
 108                         dprintk(MANTIS_ERROR, 1,
 109                                 "RISC program allocation failed");
 110
 111                         mantis_dma_exit(mantis);
 112
 113                         goto err;
 114                 }
 115                 dprintk(MANTIS_ERROR, 1,
 116                         "RISC=0x%lx cpu=0x%p size=%lx",
 117                         (unsigned long) mantis->risc_dma,
 118                         mantis->risc_cpu, MANTIS_RISC_SIZE);
 119         }
 120
 121         return 0;
 122 err:
 123         dprintk(MANTIS_ERROR, 1, "Out of memory (?) .....");
 124         return -ENOMEM;
 125 }
 126
 127 static inline int mantis_calc_lines(struct mantis_pci *mantis)
 128 {
 129         mantis->line_bytes = MANTIS_BLOCK_BYTES;
 130         mantis->line_count = MANTIS_BLOCK_COUNT;
 131
 132         while (mantis->line_bytes > 4095) {
 133                 mantis->line_bytes >>= 1;
 134                 mantis->line_count <<= 1;
 135         }
 136
 137         dprintk(MANTIS_DEBUG, 1, "Mantis RISC block bytes=[%d], line bytes=[%d], line count=[%d]",
 138                 MANTIS_BLOCK_BYTES, mantis->line_bytes, mantis->line_count);
 139
 140         if (mantis->line_count > 255) {
 141                 dprintk(MANTIS_ERROR, 1, "Buffer size error");
 142                 return -EINVAL;
 143         }
 144
 145         return 0;
 146 }
 147
 148 int mantis_dma_init(struct mantis_pci *mantis)
 149 {
 150         int err = 0;
 151
 152         dprintk(MANTIS_DEBUG, 1, "Mantis DMA init");
 153         if (mantis_alloc_buffers(mantis) < 0) {
 154                 dprintk(MANTIS_ERROR, 1, "Error allocating DMA buffer");
 155
 156                 /* Stop RISC Engine */
 157                 mmwrite(0, MANTIS_DMA_CTL);
 158
 159                 goto err;
 160         }
 161         err = mantis_calc_lines(mantis);
 162         if (err < 0) {
 163                 dprintk(MANTIS_ERROR, 1, "Mantis calc lines failed");
 164
 165                 goto err;
 166         }
 167
 168         return 0;
 169 err:
 170         return err;
 171 }
 172 EXPORT_SYMBOL_GPL(mantis_dma_init);
 173
 174 static inline void mantis_risc_program(struct mantis_pci *mantis)
 175 {
 176         u32 buf_pos = 0;
 177         u32 line;
 178
 179         dprintk(MANTIS_DEBUG, 1, "Mantis create RISC program");
 180         RISC_FLUSH();
 181
 182         dprintk(MANTIS_DEBUG, 1, "risc len lines %u, bytes per line %u",
 183                 mantis->line_count, mantis->line_bytes);
 184
 185         for (line = 0; line < mantis->line_count; line++) {
 186                 dprintk(MANTIS_DEBUG, 1, "RISC PROG line=[%d]", line);
 187                 if (!(buf_pos % MANTIS_BLOCK_BYTES)) {
 188                         RISC_INSTR(RISC_WRITE   |
 189                                    RISC_IRQ     |
 190                                    RISC_STATUS(((buf_pos / MANTIS_BLOCK_BYTES) +
 191                                    (MANTIS_BLOCK_COUNT - 1)) %
 192                                     MANTIS_BLOCK_COUNT) |
 193                                     mantis->line_bytes);
 194                 } else {
 195                         RISC_INSTR(RISC_WRITE   | mantis->line_bytes);
 196                 }
 197                 RISC_INSTR(mantis->buf_dma + buf_pos);
 198                 buf_pos += mantis->line_bytes;
 199         }
 200         RISC_INSTR(RISC_JUMP);
 201         RISC_INSTR(mantis->risc_dma);
 202 }
 203
 204 void mantis_dma_start(struct mantis_pci *mantis)
 205 {
 206         dprintk(MANTIS_DEBUG, 1, "Mantis Start DMA engine");
 207
 208         mantis_risc_program(mantis);
 209         mmwrite(mantis->risc_dma, MANTIS_RISC_START);
 210         mmwrite(mmread(MANTIS_GPIF_ADDR) | MANTIS_GPIF_HIFRDWRN, MANTIS_GPIF_ADDR);
 211
 212         mmwrite(0, MANTIS_DMA_CTL);
 213         mantis->last_block = mantis->finished_block = 0;
 214
 215         mmwrite(mmread(MANTIS_INT_MASK) | MANTIS_INT_RISCI, MANTIS_INT_MASK);
 216
 217         mmwrite(MANTIS_FIFO_EN | MANTIS_DCAP_EN
 218                                | MANTIS_RISC_EN, MANTIS_DMA_CTL);
 219
 220 }
 221
 222 void mantis_dma_stop(struct mantis_pci *mantis)
 223 {
 224         u32 stat = 0, mask = 0;
 225
 226         stat = mmread(MANTIS_INT_STAT);
 227         mask = mmread(MANTIS_INT_MASK);
 228         dprintk(MANTIS_DEBUG, 1, "Mantis Stop DMA engine");
 229
 230         mmwrite((mmread(MANTIS_GPIF_ADDR) & (~(MANTIS_GPIF_HIFRDWRN))), MANTIS_GPIF_ADDR);
 231
 232         mmwrite((mmread(MANTIS_DMA_CTL) & ~(MANTIS_FIFO_EN |
 233                                             MANTIS_DCAP_EN |
 234                                             MANTIS_RISC_EN)), MANTIS_DMA_CTL);
 235
 236         mmwrite(mmread(MANTIS_INT_STAT), MANTIS_INT_STAT);
 237
 238         mmwrite(mmread(MANTIS_INT_MASK) & ~(MANTIS_INT_RISCI |
 239                                             MANTIS_INT_RISCEN), MANTIS_INT_MASK);
 240 }
 241
 242
 243 void mantis_dma_xfer(unsigned long data)
 244 {
 245         struct mantis_pci *mantis = (struct mantis_pci *) data;
 246         struct mantis_hwconfig *config = mantis->hwconfig;
 247
 248         while (mantis->last_block != mantis->finished_block) {
 249                 dprintk(MANTIS_DEBUG, 1, "last block=[%d] finished block=[%d]",
 250                         mantis->last_block, mantis->finished_block);
 251
 252                 (config->ts_size ? dvb_dmx_swfilter_204 : dvb_dmx_swfilter)
 253                 (&mantis->demux, &mantis->buf_cpu[mantis->last_block * MANTIS_BLOCK_BYTES], MANTIS_BLOCK_BYTES);
 254                 mantis->last_block = (mantis->last_block + 1) % MANTIS_BLOCK_COUNT;
 255         }
 256 }