drivers/media/pci/solo6x10/solo6x10-p2m.c

   1 /*
   2  * Copyright (C) 2010-2013 Bluecherry, LLC <http://www.bluecherrydvr.com>
   3  *
   4  * Original author:
   5  * Ben Collins <bcollins@ubuntu.com>
   6  *
   7  * Additional work by:
   8  * John Brooks <john.brooks@bluecherry.net>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/slab.h>
  24
  25 #include "solo6x10.h"
  26
  27 static int multi_p2m;
  28 module_param(multi_p2m, uint, 0644);
  29 MODULE_PARM_DESC(multi_p2m,
  30                  "Use multiple P2M DMA channels (default: no, 6010-only)");
  31
  32 static int desc_mode;
  33 module_param(desc_mode, uint, 0644);
  34 MODULE_PARM_DESC(desc_mode,
  35                  "Allow use of descriptor mode DMA (default: no, 6010-only)");
  36
  37 int solo_p2m_dma(struct solo_dev *solo_dev, int wr,
  38                  void *sys_addr, u32 ext_addr, u32 size,
  39                  int repeat, u32 ext_size)
  40 {
  41         dma_addr_t dma_addr;
  42         int ret;
  43
  44         if (WARN_ON_ONCE((unsigned long)sys_addr & 0x03))
  45                 return -EINVAL;
  46         if (WARN_ON_ONCE(!size))
  47                 return -EINVAL;
  48
  49         dma_addr = pci_map_single(solo_dev->pdev, sys_addr, size,
  50                                   wr ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
  51         if (pci_dma_mapping_error(solo_dev->pdev, dma_addr))
  52                 return -ENOMEM;
  53
  54         ret = solo_p2m_dma_t(solo_dev, wr, dma_addr, ext_addr, size,
  55                              repeat, ext_size);
  56
  57         pci_unmap_single(solo_dev->pdev, dma_addr, size,
  58                          wr ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
  59
  60         return ret;
  61 }
  62
  63 /* Mutex must be held for p2m_id before calling this!! */
  64 int solo_p2m_dma_desc(struct solo_dev *solo_dev,
  65                       struct solo_p2m_desc *desc, dma_addr_t desc_dma,
  66                       int desc_cnt)
  67 {
  68         struct solo_p2m_dev *p2m_dev;
  69         unsigned int timeout;
  70         unsigned int config = 0;
  71         int ret = 0;
  72         unsigned int p2m_id = 0;
  73
  74         /* Get next ID. According to Softlogic, 6110 has problems on !=0 P2M */
  75         if (solo_dev->type != SOLO_DEV_6110 && multi_p2m)
  76                 p2m_id = atomic_inc_return(&solo_dev->p2m_count) % SOLO_NR_P2M;
  77
  78         p2m_dev = &solo_dev->p2m_dev[p2m_id];
  79
  80         if (mutex_lock_interruptible(&p2m_dev->mutex))
  81                 return -EINTR;
  82
  83         reinit_completion(&p2m_dev->completion);
  84         p2m_dev->error = 0;
  85
  86         if (desc_cnt > 1 && solo_dev->type != SOLO_DEV_6110 && desc_mode) {
  87                 /* For 6010 with more than one desc, we can do a one-shot */
  88                 p2m_dev->desc_count = p2m_dev->desc_idx = 0;
  89                 config = solo_reg_read(solo_dev, SOLO_P2M_CONFIG(p2m_id));
  90
  91                 solo_reg_write(solo_dev, SOLO_P2M_DES_ADR(p2m_id), desc_dma);
  92                 solo_reg_write(solo_dev, SOLO_P2M_DESC_ID(p2m_id), desc_cnt);
  93                 solo_reg_write(solo_dev, SOLO_P2M_CONFIG(p2m_id), config |
  94                                SOLO_P2M_DESC_MODE);
  95         } else {
  96                 /* For single descriptors and 6110, we need to run each desc */
  97                 p2m_dev->desc_count = desc_cnt;
  98                 p2m_dev->desc_idx = 1;
  99                 p2m_dev->descs = desc;
 100
 101                 solo_reg_write(solo_dev, SOLO_P2M_TAR_ADR(p2m_id),
 102                                desc[1].dma_addr);
 103                 solo_reg_write(solo_dev, SOLO_P2M_EXT_ADR(p2m_id),
 104                                desc[1].ext_addr);
 105                 solo_reg_write(solo_dev, SOLO_P2M_EXT_CFG(p2m_id),
 106                                desc[1].cfg);
 107                 solo_reg_write(solo_dev, SOLO_P2M_CONTROL(p2m_id),
 108                                desc[1].ctrl);
 109         }
 110
 111         timeout = wait_for_completion_timeout(&p2m_dev->completion,
 112                                               solo_dev->p2m_jiffies);
 113
 114         if (WARN_ON_ONCE(p2m_dev->error))
 115                 ret = -EIO;
 116         else if (timeout == 0) {
 117                 solo_dev->p2m_timeouts++;
 118                 ret = -EAGAIN;
 119         }
 120
 121         solo_reg_write(solo_dev, SOLO_P2M_CONTROL(p2m_id), 0);
 122
 123         /* Don't write here for the no_desc_mode case, because config is 0.
 124          * We can't test no_desc_mode again, it might race. */
 125         if (desc_cnt > 1 && solo_dev->type != SOLO_DEV_6110 && config)
 126                 solo_reg_write(solo_dev, SOLO_P2M_CONFIG(p2m_id), config);
 127
 128         mutex_unlock(&p2m_dev->mutex);
 129
 130         return ret;
 131 }
 132
 133 void solo_p2m_fill_desc(struct solo_p2m_desc *desc, int wr,
 134                         dma_addr_t dma_addr, u32 ext_addr, u32 size,
 135                         int repeat, u32 ext_size)
 136 {
 137         WARN_ON_ONCE(dma_addr & 0x03);
 138         WARN_ON_ONCE(!size);
 139
 140         desc->cfg = SOLO_P2M_COPY_SIZE(size >> 2);
 141         desc->ctrl = SOLO_P2M_BURST_SIZE(SOLO_P2M_BURST_256) |
 142                 (wr ? SOLO_P2M_WRITE : 0) | SOLO_P2M_TRANS_ON;
 143
 144         if (repeat) {
 145                 desc->cfg |= SOLO_P2M_EXT_INC(ext_size >> 2);
 146                 desc->ctrl |=  SOLO_P2M_PCI_INC(size >> 2) |
 147                          SOLO_P2M_REPEAT(repeat);
 148         }
 149
 150         desc->dma_addr = dma_addr;
 151         desc->ext_addr = ext_addr;
 152 }
 153
 154 int solo_p2m_dma_t(struct solo_dev *solo_dev, int wr,
 155                    dma_addr_t dma_addr, u32 ext_addr, u32 size,
 156                    int repeat, u32 ext_size)
 157 {
 158         struct solo_p2m_desc desc[2];
 159
 160         solo_p2m_fill_desc(&desc[1], wr, dma_addr, ext_addr, size, repeat,
 161                            ext_size);
 162
 163         /* No need for desc_dma since we know it is a single-shot */
 164         return solo_p2m_dma_desc(solo_dev, desc, 0, 1);
 165 }
 166
 167 void solo_p2m_isr(struct solo_dev *solo_dev, int id)
 168 {
 169         struct solo_p2m_dev *p2m_dev = &solo_dev->p2m_dev[id];
 170         struct solo_p2m_desc *desc;
 171
 172         if (p2m_dev->desc_count <= p2m_dev->desc_idx) {
 173                 complete(&p2m_dev->completion);
 174                 return;
 175         }
 176
 177         /* Setup next descriptor */
 178         p2m_dev->desc_idx++;
 179         desc = &p2m_dev->descs[p2m_dev->desc_idx];
 180
 181         solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), 0);
 182         solo_reg_write(solo_dev, SOLO_P2M_TAR_ADR(id), desc->dma_addr);
 183         solo_reg_write(solo_dev, SOLO_P2M_EXT_ADR(id), desc->ext_addr);
 184         solo_reg_write(solo_dev, SOLO_P2M_EXT_CFG(id), desc->cfg);
 185         solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), desc->ctrl);
 186 }
 187
 188 void solo_p2m_error_isr(struct solo_dev *solo_dev)
 189 {
 190         unsigned int err = solo_reg_read(solo_dev, SOLO_PCI_ERR);
 191         struct solo_p2m_dev *p2m_dev;
 192         int i;
 193
 194         if (!(err & (SOLO_PCI_ERR_P2M | SOLO_PCI_ERR_P2M_DESC)))
 195                 return;
 196
 197         for (i = 0; i < SOLO_NR_P2M; i++) {
 198                 p2m_dev = &solo_dev->p2m_dev[i];
 199                 p2m_dev->error = 1;
 200                 solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), 0);
 201                 complete(&p2m_dev->completion);
 202         }
 203 }
 204
 205 void solo_p2m_exit(struct solo_dev *solo_dev)
 206 {
 207         int i;
 208
 209         for (i = 0; i < SOLO_NR_P2M; i++)
 210                 solo_irq_off(solo_dev, SOLO_IRQ_P2M(i));
 211 }
 212
 213 static int solo_p2m_test(struct solo_dev *solo_dev, int base, int size)
 214 {
 215         u32 *wr_buf;
 216         u32 *rd_buf;
 217         int i;
 218         int ret = -EIO;
 219         int order = get_order(size);
 220
 221         wr_buf = (u32 *)__get_free_pages(GFP_KERNEL, order);
 222         if (wr_buf == NULL)
 223                 return -1;
 224
 225         rd_buf = (u32 *)__get_free_pages(GFP_KERNEL, order);
 226         if (rd_buf == NULL) {
 227                 free_pages((unsigned long)wr_buf, order);
 228                 return -1;
 229         }
 230
 231         for (i = 0; i < (size >> 3); i++)
 232                 *(wr_buf + i) = (i << 16) | (i + 1);
 233
 234         for (i = (size >> 3); i < (size >> 2); i++)
 235                 *(wr_buf + i) = ~((i << 16) | (i + 1));
 236
 237         memset(rd_buf, 0x55, size);
 238
 239         if (solo_p2m_dma(solo_dev, 1, wr_buf, base, size, 0, 0))
 240                 goto test_fail;
 241
 242         if (solo_p2m_dma(solo_dev, 0, rd_buf, base, size, 0, 0))
 243                 goto test_fail;
 244
 245         for (i = 0; i < (size >> 2); i++) {
 246                 if (*(wr_buf + i) != *(rd_buf + i))
 247                         goto test_fail;
 248         }
 249
 250         ret = 0;
 251
 252 test_fail:
 253         free_pages((unsigned long)wr_buf, order);
 254         free_pages((unsigned long)rd_buf, order);
 255
 256         return ret;
 257 }
 258
 259 int solo_p2m_init(struct solo_dev *solo_dev)
 260 {
 261         struct solo_p2m_dev *p2m_dev;
 262         int i;
 263
 264         for (i = 0; i < SOLO_NR_P2M; i++) {
 265                 p2m_dev = &solo_dev->p2m_dev[i];
 266
 267                 mutex_init(&p2m_dev->mutex);
 268                 init_completion(&p2m_dev->completion);
 269
 270                 solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), 0);
 271                 solo_reg_write(solo_dev, SOLO_P2M_CONFIG(i),
 272                                SOLO_P2M_CSC_16BIT_565 |
 273                                SOLO_P2M_DESC_INTR_OPT |
 274                                SOLO_P2M_DMA_INTERVAL(0) |
 275                                SOLO_P2M_PCI_MASTER_MODE);
 276                 solo_irq_on(solo_dev, SOLO_IRQ_P2M(i));
 277         }
 278
 279         /* Find correct SDRAM size */
 280         for (solo_dev->sdram_size = 0, i = 2; i >= 0; i--) {
 281                 solo_reg_write(solo_dev, SOLO_DMA_CTRL,
 282                                SOLO_DMA_CTRL_REFRESH_CYCLE(1) |
 283                                SOLO_DMA_CTRL_SDRAM_SIZE(i) |
 284                                SOLO_DMA_CTRL_SDRAM_CLK_INVERT |
 285                                SOLO_DMA_CTRL_READ_CLK_SELECT |
 286                                SOLO_DMA_CTRL_LATENCY(1));
 287
 288                 solo_reg_write(solo_dev, SOLO_SYS_CFG, solo_dev->sys_config |
 289                                SOLO_SYS_CFG_RESET);
 290                 solo_reg_write(solo_dev, SOLO_SYS_CFG, solo_dev->sys_config);
 291
 292                 switch (i) {
 293                 case 2:
 294                         if (solo_p2m_test(solo_dev, 0x07ff0000, 0x00010000) ||
 295                             solo_p2m_test(solo_dev, 0x05ff0000, 0x00010000))
 296                                 continue;
 297                         break;
 298
 299                 case 1:
 300                         if (solo_p2m_test(solo_dev, 0x03ff0000, 0x00010000))
 301                                 continue;
 302                         break;
 303
 304                 default:
 305                         if (solo_p2m_test(solo_dev, 0x01ff0000, 0x00010000))
 306                                 continue;
 307                 }
 308
 309                 solo_dev->sdram_size = (32 << 20) << i;
 310                 break;
 311         }
 312
 313         if (!solo_dev->sdram_size) {
 314                 dev_err(&solo_dev->pdev->dev, "Error detecting SDRAM size\n");
 315                 return -EIO;
 316         }
 317
 318         if (SOLO_SDRAM_END(solo_dev) > solo_dev->sdram_size) {
 319                 dev_err(&solo_dev->pdev->dev,
 320                         "SDRAM is not large enough (%u < %u)\n",
 321                         solo_dev->sdram_size, SOLO_SDRAM_END(solo_dev));
 322                 return -EIO;
 323         }
 324
 325         return 0;
 326 }