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/slab.h>
  22 #include <linux/scatterlist.h>
  23 #include "solo6x10.h"
  24
  25 /* #define SOLO_TEST_P2M */
  26
  27 int solo_p2m_dma(struct solo_dev *solo_dev, u8 id, int wr,
  28                  void *sys_addr, u32 ext_addr, u32 size)
  29 {
  30         dma_addr_t dma_addr;
  31         int ret;
  32
  33         WARN_ON(!size);
  34         BUG_ON(id >= SOLO_NR_P2M);
  35
  36         if (!size)
  37                 return -EINVAL;
  38
  39         dma_addr = pci_map_single(solo_dev->pdev, sys_addr, size,
  40                                   wr ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
  41
  42         ret = solo_p2m_dma_t(solo_dev, id, wr, dma_addr, ext_addr, size);
  43
  44         pci_unmap_single(solo_dev->pdev, dma_addr, size,
  45                          wr ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
  46
  47         return ret;
  48 }
  49
  50 int solo_p2m_dma_t(struct solo_dev *solo_dev, u8 id, int wr,
  51                    dma_addr_t dma_addr, u32 ext_addr, u32 size)
  52 {
  53         struct p2m_desc *desc = kzalloc(sizeof(*desc) * 2, GFP_DMA);
  54         int ret;
  55
  56         if (desc == NULL)
  57                 return -ENOMEM;
  58
  59         solo_p2m_push_desc(&desc[1], wr, dma_addr, ext_addr, size, 0, 0);
  60         ret = solo_p2m_dma_desc(solo_dev, id, desc, 2);
  61         kfree(desc);
  62
  63         return ret;
  64 }
  65
  66 void solo_p2m_push_desc(struct p2m_desc *desc, int wr, dma_addr_t dma_addr,
  67                         u32 ext_addr, u32 size, int repeat, u32 ext_size)
  68 {
  69         desc->ta = cpu_to_le32(dma_addr);
  70         desc->fa = cpu_to_le32(ext_addr);
  71
  72         desc->ext = cpu_to_le32(SOLO_P2M_COPY_SIZE(size >> 2));
  73         desc->ctrl = cpu_to_le32(SOLO_P2M_BURST_SIZE(SOLO_P2M_BURST_256) |
  74                                  (wr ? SOLO_P2M_WRITE : 0) | SOLO_P2M_TRANS_ON);
  75
  76         /* Ext size only matters when we're repeating */
  77         if (repeat) {
  78                 desc->ext |= cpu_to_le32(SOLO_P2M_EXT_INC(ext_size >> 2));
  79                 desc->ctrl |=  cpu_to_le32(SOLO_P2M_PCI_INC(size >> 2) |
  80                                            SOLO_P2M_REPEAT(repeat));
  81         }
  82 }
  83
  84 int solo_p2m_dma_desc(struct solo_dev *solo_dev, u8 id,
  85                       struct p2m_desc *desc, int desc_count)
  86 {
  87         struct solo_p2m_dev *p2m_dev;
  88         unsigned int timeout;
  89         int ret = 0;
  90         u32 config = 0;
  91         dma_addr_t desc_dma = 0;
  92
  93         BUG_ON(id >= SOLO_NR_P2M);
  94         BUG_ON(!desc_count || desc_count > SOLO_NR_P2M_DESC);
  95
  96         p2m_dev = &solo_dev->p2m_dev[id];
  97
  98         mutex_lock(&p2m_dev->mutex);
  99
 100         solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), 0);
 101
 102         INIT_COMPLETION(p2m_dev->completion);
 103         p2m_dev->error = 0;
 104
 105         /* Enable the descriptors */
 106         config = solo_reg_read(solo_dev, SOLO_P2M_CONFIG(id));
 107         desc_dma = pci_map_single(solo_dev->pdev, desc,
 108                                   desc_count * sizeof(*desc),
 109                                   PCI_DMA_TODEVICE);
 110         solo_reg_write(solo_dev, SOLO_P2M_DES_ADR(id), desc_dma);
 111         solo_reg_write(solo_dev, SOLO_P2M_DESC_ID(id), desc_count - 1);
 112         solo_reg_write(solo_dev, SOLO_P2M_CONFIG(id), config |
 113                        SOLO_P2M_DESC_MODE);
 114
 115         /* Should have all descriptors completed from one interrupt */
 116         timeout = wait_for_completion_timeout(&p2m_dev->completion, HZ);
 117
 118         solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), 0);
 119
 120         /* Reset back to non-descriptor mode */
 121         solo_reg_write(solo_dev, SOLO_P2M_CONFIG(id), config);
 122         solo_reg_write(solo_dev, SOLO_P2M_DESC_ID(id), 0);
 123         solo_reg_write(solo_dev, SOLO_P2M_DES_ADR(id), 0);
 124         pci_unmap_single(solo_dev->pdev, desc_dma,
 125                          desc_count * sizeof(*desc),
 126                          PCI_DMA_TODEVICE);
 127
 128         if (p2m_dev->error)
 129                 ret = -EIO;
 130         else if (timeout == 0)
 131                 ret = -EAGAIN;
 132
 133         mutex_unlock(&p2m_dev->mutex);
 134
 135         WARN_ON_ONCE(ret);
 136
 137         return ret;
 138 }
 139
 140 int solo_p2m_dma_sg(struct solo_dev *solo_dev, u8 id,
 141                     struct p2m_desc *pdesc, int wr,
 142                     struct scatterlist *sg, u32 sg_off,
 143                     u32 ext_addr, u32 size)
 144 {
 145         int i;
 146         int idx;
 147
 148         BUG_ON(id >= SOLO_NR_P2M);
 149
 150         if (WARN_ON_ONCE(!size))
 151                 return -EINVAL;
 152
 153         memset(pdesc, 0, sizeof(*pdesc));
 154
 155         /* Should rewrite this to handle > SOLO_NR_P2M_DESC transactions */
 156         for (i = 0, idx = 1; idx < SOLO_NR_P2M_DESC && sg && size > 0;
 157              i++, sg = sg_next(sg)) {
 158                 struct p2m_desc *desc = &pdesc[idx];
 159                 u32 sg_len = sg_dma_len(sg);
 160                 u32 len;
 161
 162                 if (sg_off >= sg_len) {
 163                         sg_off -= sg_len;
 164                         continue;
 165                 }
 166
 167                 sg_len -= sg_off;
 168                 len = min(sg_len, size);
 169
 170                 solo_p2m_push_desc(desc, wr, sg_dma_address(sg) + sg_off,
 171                                    ext_addr, len, 0, 0);
 172
 173                 size -= len;
 174                 ext_addr += len;
 175                 idx++;
 176
 177                 sg_off = 0;
 178         }
 179
 180         WARN_ON_ONCE(size || i >= SOLO_NR_P2M_DESC);
 181
 182         return solo_p2m_dma_desc(solo_dev, id, pdesc, idx);
 183 }
 184
 185 #ifdef SOLO_TEST_P2M
 186
 187 #define P2M_TEST_CHAR           0xbe
 188
 189 static unsigned long long p2m_test(struct solo_dev *solo_dev, u8 id,
 190                                    u32 base, int size)
 191 {
 192         u8 *wr_buf;
 193         u8 *rd_buf;
 194         int i;
 195         unsigned long long err_cnt = 0;
 196
 197         wr_buf = kmalloc(size, GFP_KERNEL);
 198         if (!wr_buf) {
 199                 printk(SOLO6X10_NAME ": Failed to malloc for p2m_test\n");
 200                 return size;
 201         }
 202
 203         rd_buf = kmalloc(size, GFP_KERNEL);
 204         if (!rd_buf) {
 205                 printk(SOLO6X10_NAME ": Failed to malloc for p2m_test\n");
 206                 kfree(wr_buf);
 207                 return size;
 208         }
 209
 210         memset(wr_buf, P2M_TEST_CHAR, size);
 211         memset(rd_buf, P2M_TEST_CHAR + 1, size);
 212
 213         solo_p2m_dma(solo_dev, id, 1, wr_buf, base, size);
 214         solo_p2m_dma(solo_dev, id, 0, rd_buf, base, size);
 215
 216         for (i = 0; i < size; i++)
 217                 if (wr_buf[i] != rd_buf[i])
 218                         err_cnt++;
 219
 220         kfree(wr_buf);
 221         kfree(rd_buf);
 222
 223         return err_cnt;
 224 }
 225
 226 #define TEST_CHUNK_SIZE         (8 * 1024)
 227
 228 static void run_p2m_test(struct solo_dev *solo_dev)
 229 {
 230         unsigned long long errs = 0;
 231         u32 size = SOLO_JPEG_EXT_ADDR(solo_dev) + SOLO_JPEG_EXT_SIZE(solo_dev);
 232         int i, d;
 233
 234         printk(KERN_WARNING "%s: Testing %u bytes of external ram\n",
 235                SOLO6X10_NAME, size);
 236
 237         for (i = 0; i < size; i += TEST_CHUNK_SIZE)
 238                 for (d = 0; d < 4; d++)
 239                         errs += p2m_test(solo_dev, d, i, TEST_CHUNK_SIZE);
 240
 241         printk(KERN_WARNING "%s: Found %llu errors during p2m test\n",
 242                SOLO6X10_NAME, errs);
 243
 244         return;
 245 }
 246 #else
 247 #define run_p2m_test(__solo)    do {} while (0)
 248 #endif
 249
 250 void solo_p2m_isr(struct solo_dev *solo_dev, int id)
 251 {
 252         struct solo_p2m_dev *p2m_dev = &solo_dev->p2m_dev[id];
 253
 254         solo_reg_write(solo_dev, SOLO_IRQ_STAT, SOLO_IRQ_P2M(id));
 255
 256         complete(&p2m_dev->completion);
 257 }
 258
 259 void solo_p2m_error_isr(struct solo_dev *solo_dev, u32 status)
 260 {
 261         struct solo_p2m_dev *p2m_dev;
 262         int i;
 263
 264         if (!(status & SOLO_PCI_ERR_P2M))
 265                 return;
 266
 267         for (i = 0; i < SOLO_NR_P2M; i++) {
 268                 p2m_dev = &solo_dev->p2m_dev[i];
 269                 p2m_dev->error = 1;
 270                 solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), 0);
 271                 complete(&p2m_dev->completion);
 272         }
 273 }
 274
 275 void solo_p2m_exit(struct solo_dev *solo_dev)
 276 {
 277         int i;
 278
 279         for (i = 0; i < SOLO_NR_P2M; i++)
 280                 solo_irq_off(solo_dev, SOLO_IRQ_P2M(i));
 281 }
 282
 283 int solo_p2m_init(struct solo_dev *solo_dev)
 284 {
 285         struct solo_p2m_dev *p2m_dev;
 286         int i;
 287
 288         for (i = 0; i < SOLO_NR_P2M; i++) {
 289                 p2m_dev = &solo_dev->p2m_dev[i];
 290
 291                 mutex_init(&p2m_dev->mutex);
 292                 init_completion(&p2m_dev->completion);
 293
 294                 solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), 0);
 295                 solo_reg_write(solo_dev, SOLO_P2M_CONFIG(i),
 296                                SOLO_P2M_CSC_16BIT_565 |
 297                                SOLO_P2M_DMA_INTERVAL(3) |
 298                                SOLO_P2M_DESC_INTR_OPT |
 299                                SOLO_P2M_PCI_MASTER_MODE);
 300                 solo_irq_on(solo_dev, SOLO_IRQ_P2M(i));
 301         }
 302
 303         run_p2m_test(solo_dev);
 304
 305         return 0;
 306 }