drivers/media/pci/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(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 = 0;
 134
 135         dprintk(MANTIS_DEBUG, 1, "Mantis DMA init");
 136         if (mantis_alloc_buffers(mantis) < 0) {
 137                 dprintk(MANTIS_ERROR, 1, "Error allocating DMA buffer");
 138
 139                 /* Stop RISC Engine */
 140                 mmwrite(0, MANTIS_DMA_CTL);
 141
 142                 goto err;
 143         }
 144
 145         return 0;
 146 err:
 147         return err;
 148 }
 149 EXPORT_SYMBOL_GPL(mantis_dma_init);
 150
 151 static inline void mantis_risc_program(struct mantis_pci *mantis)
 152 {
 153         u32 buf_pos = 0;
 154         u32 line, step;
 155         u32 risc_pos;
 156
 157         dprintk(MANTIS_DEBUG, 1, "Mantis create RISC program");
 158         RISC_FLUSH(risc_pos);
 159
 160         dprintk(MANTIS_DEBUG, 1, "risc len lines %u, bytes per line %u, bytes per DMA tr %u",
 161                 MANTIS_BLOCK_COUNT, MANTIS_BLOCK_BYTES, MANTIS_DMA_TR_BYTES);
 162
 163         for (line = 0; line < MANTIS_BLOCK_COUNT; line++) {
 164                 for (step = 0; step < MANTIS_DMA_TR_UNITS; step++) {
 165                         dprintk(MANTIS_DEBUG, 1, "RISC PROG line=[%d], step=[%d]", line, step);
 166                         if (step == 0) {
 167                                 RISC_INSTR(risc_pos, RISC_WRITE |
 168                                            RISC_IRQ     |
 169                                            RISC_STATUS(line) |
 170                                            MANTIS_DMA_TR_BYTES);
 171                         } else {
 172                                 RISC_INSTR(risc_pos, RISC_WRITE | MANTIS_DMA_TR_BYTES);
 173                         }
 174                         RISC_INSTR(risc_pos, mantis->buf_dma + buf_pos);
 175                         buf_pos += MANTIS_DMA_TR_BYTES;
 176                   }
 177         }
 178         RISC_INSTR(risc_pos, RISC_JUMP);
 179         RISC_INSTR(risc_pos, mantis->risc_dma);
 180 }
 181
 182 void mantis_dma_start(struct mantis_pci *mantis)
 183 {
 184         dprintk(MANTIS_DEBUG, 1, "Mantis Start DMA engine");
 185
 186         mantis_risc_program(mantis);
 187         mmwrite(mantis->risc_dma, MANTIS_RISC_START);
 188         mmwrite(mmread(MANTIS_GPIF_ADDR) | MANTIS_GPIF_HIFRDWRN, MANTIS_GPIF_ADDR);
 189
 190         mmwrite(0, MANTIS_DMA_CTL);
 191         mantis->last_block = mantis->busy_block = 0;
 192
 193         mmwrite(mmread(MANTIS_INT_MASK) | MANTIS_INT_RISCI, MANTIS_INT_MASK);
 194
 195         mmwrite(MANTIS_FIFO_EN | MANTIS_DCAP_EN
 196                                | MANTIS_RISC_EN, MANTIS_DMA_CTL);
 197
 198 }
 199
 200 void mantis_dma_stop(struct mantis_pci *mantis)
 201 {
 202         dprintk(MANTIS_DEBUG, 1, "Mantis Stop DMA engine");
 203
 204         mmwrite((mmread(MANTIS_GPIF_ADDR) & (~(MANTIS_GPIF_HIFRDWRN))), MANTIS_GPIF_ADDR);
 205
 206         mmwrite((mmread(MANTIS_DMA_CTL) & ~(MANTIS_FIFO_EN |
 207                                             MANTIS_DCAP_EN |
 208                                             MANTIS_RISC_EN)), MANTIS_DMA_CTL);
 209
 210         mmwrite(mmread(MANTIS_INT_STAT), MANTIS_INT_STAT);
 211
 212         mmwrite(mmread(MANTIS_INT_MASK) & ~(MANTIS_INT_RISCI |
 213                                             MANTIS_INT_RISCEN), MANTIS_INT_MASK);
 214 }
 215
 216
 217 void mantis_dma_xfer(unsigned long data)
 218 {
 219         struct mantis_pci *mantis = (struct mantis_pci *) data;
 220         struct mantis_hwconfig *config = mantis->hwconfig;
 221
 222         while (mantis->last_block != mantis->busy_block) {
 223                 dprintk(MANTIS_DEBUG, 1, "last block=[%d] finished block=[%d]",
 224                         mantis->last_block, mantis->busy_block);
 225
 226                 (config->ts_size ? dvb_dmx_swfilter_204 : dvb_dmx_swfilter)
 227                 (&mantis->demux, &mantis->buf_cpu[mantis->last_block * MANTIS_BLOCK_BYTES], MANTIS_BLOCK_BYTES);
 228                 mantis->last_block = (mantis->last_block + 1) % MANTIS_BLOCK_COUNT;
 229         }
 230 }