drivers/media/video/cx25840/cx25840-firmware.c

   1 /* cx25840 firmware functions
   2  *
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU General Public License
   5  * as published by the Free Software Foundation; either version 2
   6  * of the License, or (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/i2c.h>
  20 #include <linux/i2c-algo-bit.h>
  21 #include <linux/firmware.h>
  22 #include <media/v4l2-common.h>
  23 #include <media/cx25840.h>
  24
  25 #include "cx25840-core.h"
  26
  27 #define FWFILE "v4l-cx25840.fw"
  28 #define FWSEND 1024
  29
  30 #define FWDEV(x) &((x)->adapter->dev)
  31
  32 static int fastfw = 1;
  33 static char *firmware = FWFILE;
  34
  35 module_param(fastfw, bool, 0444);
  36 module_param(firmware, charp, 0444);
  37
  38 MODULE_PARM_DESC(fastfw, "Load firmware fast [0=100MHz 1=333MHz (default)]");
  39 MODULE_PARM_DESC(firmware, "Firmware image [default: " FWFILE "]");
  40
  41 static void set_i2c_delay(struct i2c_client *client, int delay)
  42 {
  43         struct i2c_algo_bit_data *algod = client->adapter->algo_data;
  44
  45         /* We aren't guaranteed to be using algo_bit,
  46          * so avoid the null pointer dereference
  47          * and disable the 'fast firmware load' */
  48         if (algod) {
  49                 algod->udelay = delay;
  50         } else {
  51                 fastfw = 0;
  52         }
  53 }
  54
  55 static void start_fw_load(struct i2c_client *client)
  56 {
  57         /* DL_ADDR_LB=0 DL_ADDR_HB=0 */
  58         cx25840_write(client, 0x800, 0x00);
  59         cx25840_write(client, 0x801, 0x00);
  60         // DL_MAP=3 DL_AUTO_INC=0 DL_ENABLE=1
  61         cx25840_write(client, 0x803, 0x0b);
  62         /* AUTO_INC_DIS=1 */
  63         cx25840_write(client, 0x000, 0x20);
  64
  65         if (fastfw)
  66                 set_i2c_delay(client, 3);
  67 }
  68
  69 static void end_fw_load(struct i2c_client *client)
  70 {
  71         if (fastfw)
  72                 set_i2c_delay(client, 10);
  73
  74         /* AUTO_INC_DIS=0 */
  75         cx25840_write(client, 0x000, 0x00);
  76         /* DL_ENABLE=0 */
  77         cx25840_write(client, 0x803, 0x03);
  78 }
  79
  80 static int check_fw_load(struct i2c_client *client, int size)
  81 {
  82         /* DL_ADDR_HB DL_ADDR_LB */
  83         int s = cx25840_read(client, 0x801) << 8;
  84         s |= cx25840_read(client, 0x800);
  85
  86         if (size != s) {
  87                 v4l_err(client, "firmware %s load failed\n", firmware);
  88                 return -EINVAL;
  89         }
  90
  91         v4l_info(client, "loaded %s firmware (%d bytes)\n", firmware, size);
  92         return 0;
  93 }
  94
  95 static int fw_write(struct i2c_client *client, u8 * data, int size)
  96 {
  97         int sent;
  98
  99         if ((sent = i2c_master_send(client, data, size)) < size) {
 100
 101                 if (fastfw) {
 102                         v4l_err(client, "333MHz i2c firmware load failed\n");
 103                         fastfw = 0;
 104                         set_i2c_delay(client, 10);
 105
 106                         if (sent > 2) {
 107                                 u16 dl_addr = cx25840_read(client, 0x801) << 8;
 108                                 dl_addr |= cx25840_read(client, 0x800);
 109                                 dl_addr -= sent - 2;
 110                                 cx25840_write(client, 0x801, dl_addr >> 8);
 111                                 cx25840_write(client, 0x800, dl_addr & 0xff);
 112                         }
 113
 114                         if (i2c_master_send(client, data, size) < size) {
 115                                 v4l_err(client, "100MHz i2c firmware load failed\n");
 116                                 return -ENOSYS;
 117                         }
 118
 119                 } else {
 120                         v4l_err(client, "firmware load i2c failure\n");
 121                         return -ENOSYS;
 122                 }
 123
 124         }
 125
 126         return 0;
 127 }
 128
 129 int cx25840_loadfw(struct i2c_client *client)
 130 {
 131         const struct firmware *fw = NULL;
 132         u8 buffer[4], *ptr;
 133         int size, send, retval;
 134
 135         if (request_firmware(&fw, firmware, FWDEV(client)) != 0) {
 136                 v4l_err(client, "unable to open firmware %s\n", firmware);
 137                 return -EINVAL;
 138         }
 139
 140         start_fw_load(client);
 141
 142         buffer[0] = 0x08;
 143         buffer[1] = 0x02;
 144         buffer[2] = fw->data[0];
 145         buffer[3] = fw->data[1];
 146         retval = fw_write(client, buffer, 4);
 147
 148         if (retval < 0) {
 149                 release_firmware(fw);
 150                 return retval;
 151         }
 152
 153         size = fw->size - 2;
 154         ptr = fw->data;
 155         while (size > 0) {
 156                 ptr[0] = 0x08;
 157                 ptr[1] = 0x02;
 158                 send = size > (FWSEND - 2) ? FWSEND : size + 2;
 159                 retval = fw_write(client, ptr, send);
 160
 161                 if (retval < 0) {
 162                         release_firmware(fw);
 163                         return retval;
 164                 }
 165
 166                 size -= FWSEND - 2;
 167                 ptr += FWSEND - 2;
 168         }
 169
 170         end_fw_load(client);
 171
 172         size = fw->size;
 173         release_firmware(fw);
 174
 175         return check_fw_load(client, size);
 176 }