drivers/staging/solo6x10/p2m.c

   1 /*
   2  * Copyright (C) 2010 Bluecherry, LLC www.bluecherrydvr.com
   3  * Copyright (C) 2010 Ben Collins <bcollins@bluecherry.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/scatterlist.h>
  22 #include "solo6x10.h"
  23
  24 /* #define SOLO_TEST_P2M */
  25
  26 int solo_p2m_dma(struct solo_dev *solo_dev, u8 id, int wr,
  27                  void *sys_addr, u32 ext_addr, u32 size)
  28 {
  29         dma_addr_t dma_addr;
  30         int ret;
  31
  32         WARN_ON(!size);
  33         BUG_ON(id >= SOLO_NR_P2M);
  34
  35         if (!size)
  36                 return -EINVAL;
  37
  38         dma_addr = pci_map_single(solo_dev->pdev, sys_addr, size,
  39                                   wr ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
  40
  41         ret = solo_p2m_dma_t(solo_dev, id, wr, dma_addr, ext_addr, size);
  42
  43         pci_unmap_single(solo_dev->pdev, dma_addr, size,
  44                          wr ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
  45
  46         return ret;
  47 }
  48
  49 int solo_p2m_dma_t(struct solo_dev *solo_dev, u8 id, int wr,
  50                    dma_addr_t dma_addr, u32 ext_addr, u32 size)
  51 {
  52         struct p2m_desc *desc = kzalloc(sizeof(*desc) * 2, GFP_DMA);
  53         int ret;
  54
  55         if (desc == NULL)
  56                 return -ENOMEM;
  57
  58         solo_p2m_push_desc(&desc[1], wr, dma_addr, ext_addr, size, 0, 0);
  59         ret = solo_p2m_dma_desc(solo_dev, id, desc, 2);
  60         kfree(desc);
  61
  62         return ret;
  63 }
  64
  65 void solo_p2m_push_desc(struct p2m_desc *desc, int wr, dma_addr_t dma_addr,
  66                         u32 ext_addr, u32 size, int repeat, u32 ext_size)
  67 {
  68         desc->ta = cpu_to_le32(dma_addr);
  69         desc->fa = cpu_to_le32(ext_addr);
  70
  71         desc->ext = cpu_to_le32(SOLO_P2M_COPY_SIZE(size >> 2));
  72         desc->ctrl = cpu_to_le32(SOLO_P2M_BURST_SIZE(SOLO_P2M_BURST_256) |
  73                                  (wr ? SOLO_P2M_WRITE : 0) | SOLO_P2M_TRANS_ON);
  74
  75         /* Ext size only matters when we're repeating */
  76         if (repeat) {
  77                 desc->ext |= cpu_to_le32(SOLO_P2M_EXT_INC(ext_size >> 2));
  78                 desc->ctrl |=  cpu_to_le32(SOLO_P2M_PCI_INC(size >> 2) |
  79                                            SOLO_P2M_REPEAT(repeat));
  80         }
  81 }
  82
  83 int solo_p2m_dma_desc(struct solo_dev *solo_dev, u8 id,
  84                       struct p2m_desc *desc, int desc_count)
  85 {
  86         struct solo_p2m_dev *p2m_dev;
  87         unsigned int timeout;
  88         int ret = 0;
  89         u32 config = 0;
  90         dma_addr_t desc_dma = 0;
  91
  92         BUG_ON(id >= SOLO_NR_P2M);
  93         BUG_ON(!desc_count || desc_count > SOLO_NR_P2M_DESC);
  94
  95         p2m_dev = &solo_dev->p2m_dev[id];
  96
  97         mutex_lock(&p2m_dev->mutex);
  98
  99         solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), 0);
 100
 101         INIT_COMPLETION(p2m_dev->completion);
 102         p2m_dev->error = 0;
 103
 104         /* Enable the descriptors */
 105         config = solo_reg_read(solo_dev, SOLO_P2M_CONFIG(id));
 106         desc_dma = pci_map_single(solo_dev->pdev, desc,
 107                                   desc_count * sizeof(*desc),
 108                                   PCI_DMA_TODEVICE);
 109         solo_reg_write(solo_dev, SOLO_P2M_DES_ADR(id), desc_dma);
 110         solo_reg_write(solo_dev, SOLO_P2M_DESC_ID(id), desc_count - 1);
 111         solo_reg_write(solo_dev, SOLO_P2M_CONFIG(id), config |
 112                        SOLO_P2M_DESC_MODE);
 113
 114         /* Should have all descriptors completed from one interrupt */
 115         timeout = wait_for_completion_timeout(&p2m_dev->completion, HZ);
 116
 117         solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), 0);
 118
 119         /* Reset back to non-descriptor mode */
 120         solo_reg_write(solo_dev, SOLO_P2M_CONFIG(id), config);
 121         solo_reg_write(solo_dev, SOLO_P2M_DESC_ID(id), 0);
 122         solo_reg_write(solo_dev, SOLO_P2M_DES_ADR(id), 0);
 123         pci_unmap_single(solo_dev->pdev, desc_dma,
 124                          desc_count * sizeof(*desc),
 125                          PCI_DMA_TODEVICE);
 126
 127         if (p2m_dev->error)
 128                 ret = -EIO;
 129         else if (timeout == 0)
 130                 ret = -EAGAIN;
 131
 132         mutex_unlock(&p2m_dev->mutex);
 133
 134         WARN_ON_ONCE(ret);
 135
 136         return ret;
 137 }
 138
 139 int solo_p2m_dma_sg(struct solo_dev *solo_dev, u8 id,
 140                     struct p2m_desc *pdesc, int wr,
 141                     struct scatterlist *sg, u32 sg_off,
 142                     u32 ext_addr, u32 size)
 143 {
 144         int i;
 145         int idx;
 146
 147         BUG_ON(id >= SOLO_NR_P2M);
 148
 149         if (WARN_ON_ONCE(!size))
 150                 return -EINVAL;
 151
 152         memset(pdesc, 0, sizeof(*pdesc));
 153
 154         /* Should rewrite this to handle > SOLO_NR_P2M_DESC transactions */
 155         for (i = 0, idx = 1; idx < SOLO_NR_P2M_DESC && sg && size > 0;
 156              i++, sg = sg_next(sg)) {
 157                 struct p2m_desc *desc = &pdesc[idx];
 158                 u32 sg_len = sg_dma_len(sg);
 159                 u32 len;
 160
 161                 if (sg_off >= sg_len) {
 162                         sg_off -= sg_len;
 163                         continue;
 164                 }
 165
 166                 sg_len -= sg_off;
 167                 len = min(sg_len, size);
 168
 169                 solo_p2m_push_desc(desc, wr, sg_dma_address(sg) + sg_off,
 170                                    ext_addr, len, 0, 0);
 171
 172                 size -= len;
 173                 ext_addr += len;
 174                 idx++;
 175
 176                 sg_off = 0;
 177         }
 178
 179         WARN_ON_ONCE(size || i >= SOLO_NR_P2M_DESC);
 180
 181         return solo_p2m_dma_desc(solo_dev, id, pdesc, idx);
 182 }
 183
 184 #ifdef SOLO_TEST_P2M
 185
 186 #define P2M_TEST_CHAR           0xbe
 187
 188 static unsigned long long p2m_test(struct solo_dev *solo_dev, u8 id,
 189                                    u32 base, int size)
 190 {
 191         u8 *wr_buf;
 192         u8 *rd_buf;
 193         int i;
 194         unsigned long long err_cnt = 0;
 195
 196         wr_buf = kmalloc(size, GFP_KERNEL);
 197         if (!wr_buf) {
 198                 printk(SOLO6X10_NAME ": Failed to malloc for p2m_test\n");
 199                 return size;
 200         }
 201
 202         rd_buf = kmalloc(size, GFP_KERNEL);
 203         if (!rd_buf) {
 204                 printk(SOLO6X10_NAME ": Failed to malloc for p2m_test\n");
 205                 kfree(wr_buf);
 206                 return size;
 207         }
 208
 209         memset(wr_buf, P2M_TEST_CHAR, size);
 210         memset(rd_buf, P2M_TEST_CHAR + 1, size);
 211
 212         solo_p2m_dma(solo_dev, id, 1, wr_buf, base, size);
 213         solo_p2m_dma(solo_dev, id, 0, rd_buf, base, size);
 214
 215         for (i = 0; i < size; i++)
 216                 if (wr_buf[i] != rd_buf[i])
 217                         err_cnt++;
 218
 219         kfree(wr_buf);
 220         kfree(rd_buf);
 221
 222         return err_cnt;
 223 }
 224
 225 #define TEST_CHUNK_SIZE         (8 * 1024)
 226
 227 static void run_p2m_test(struct solo_dev *solo_dev)
 228 {
 229         unsigned long long errs = 0;
 230         u32 size = SOLO_JPEG_EXT_ADDR(solo_dev) + SOLO_JPEG_EXT_SIZE(solo_dev);
 231         int i, d;
 232
 233         printk(KERN_WARNING "%s: Testing %u bytes of external ram\n",
 234                SOLO6X10_NAME, size);
 235
 236         for (i = 0; i < size; i += TEST_CHUNK_SIZE)
 237                 for (d = 0; d < 4; d++)
 238                         errs += p2m_test(solo_dev, d, i, TEST_CHUNK_SIZE);
 239
 240         printk(KERN_WARNING "%s: Found %llu errors during p2m test\n",
 241                SOLO6X10_NAME, errs);
 242
 243         return;
 244 }
 245 #else
 246 #define run_p2m_test(__solo)    do {} while (0)
 247 #endif
 248
 249 void solo_p2m_isr(struct solo_dev *solo_dev, int id)
 250 {
 251         struct solo_p2m_dev *p2m_dev = &solo_dev->p2m_dev[id];
 252
 253         solo_reg_write(solo_dev, SOLO_IRQ_STAT, SOLO_IRQ_P2M(id));
 254
 255         complete(&p2m_dev->completion);
 256 }
 257
 258 void solo_p2m_error_isr(struct solo_dev *solo_dev, u32 status)
 259 {
 260         struct solo_p2m_dev *p2m_dev;
 261         int i;
 262
 263         if (!(status & SOLO_PCI_ERR_P2M))
 264                 return;
 265
 266         for (i = 0; i < SOLO_NR_P2M; i++) {
 267                 p2m_dev = &solo_dev->p2m_dev[i];
 268                 p2m_dev->error = 1;
 269                 solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), 0);
 270                 complete(&p2m_dev->completion);
 271         }
 272 }
 273
 274 void solo_p2m_exit(struct solo_dev *solo_dev)
 275 {
 276         int i;
 277
 278         for (i = 0; i < SOLO_NR_P2M; i++)
 279                 solo_irq_off(solo_dev, SOLO_IRQ_P2M(i));
 280 }
 281
 282 int solo_p2m_init(struct solo_dev *solo_dev)
 283 {
 284         struct solo_p2m_dev *p2m_dev;
 285         int i;
 286
 287         for (i = 0; i < SOLO_NR_P2M; i++) {
 288                 p2m_dev = &solo_dev->p2m_dev[i];
 289
 290                 mutex_init(&p2m_dev->mutex);
 291                 init_completion(&p2m_dev->completion);
 292
 293                 solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), 0);
 294                 solo_reg_write(solo_dev, SOLO_P2M_CONFIG(i),
 295                                SOLO_P2M_CSC_16BIT_565 |
 296                                SOLO_P2M_DMA_INTERVAL(3) |
 297                                SOLO_P2M_DESC_INTR_OPT |
 298                                SOLO_P2M_PCI_MASTER_MODE);
 299                 solo_irq_on(solo_dev, SOLO_IRQ_P2M(i));
 300         }
 301
 302         run_p2m_test(solo_dev);
 303
 304         return 0;
 305 }