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
  24 #include "cx25840.h"
  25
  26 #define FWFILE "v4l-cx25840.fw"
  27 #define FWSEND 1024
  28
  29 #define FWDEV(x) &((x)->adapter->dev)
  30
  31 static int fastfw = 1;
  32 static char *firmware = FWFILE;
  33
  34 module_param(fastfw, bool, 0444);
  35 module_param(firmware, charp, 0444);
  36
  37 MODULE_PARM_DESC(fastfw, "Load firmware fast [0=100MHz 1=333MHz (default)]");
  38 MODULE_PARM_DESC(firmware, "Firmware image [default: " FWFILE "]");
  39
  40 static void set_i2c_delay(struct i2c_client *client, int delay)
  41 {
  42         struct i2c_algo_bit_data *algod = client->adapter->algo_data;
  43
  44         /* We aren't guaranteed to be using algo_bit,
  45          * so avoid the null pointer dereference
  46          * and disable the 'fast firmware load' */
  47         if (algod) {
  48                 algod->udelay = delay;
  49         } else {
  50                 fastfw = 0;
  51         }
  52 }
  53
  54 static void start_fw_load(struct i2c_client *client)
  55 {
  56         /* DL_ADDR_LB=0 DL_ADDR_HB=0 */
  57         cx25840_write(client, 0x800, 0x00);
  58         cx25840_write(client, 0x801, 0x00);
  59         // DL_MAP=3 DL_AUTO_INC=0 DL_ENABLE=1
  60         cx25840_write(client, 0x803, 0x0b);
  61         /* AUTO_INC_DIS=1 */
  62         cx25840_write(client, 0x000, 0x20);
  63
  64         if (fastfw)
  65                 set_i2c_delay(client, 3);
  66 }
  67
  68 static void end_fw_load(struct i2c_client *client)
  69 {
  70         if (fastfw)
  71                 set_i2c_delay(client, 10);
  72
  73         /* AUTO_INC_DIS=0 */
  74         cx25840_write(client, 0x000, 0x00);
  75         /* DL_ENABLE=0 */
  76         cx25840_write(client, 0x803, 0x03);
  77 }
  78
  79 static int check_fw_load(struct i2c_client *client, int size)
  80 {
  81         /* DL_ADDR_HB DL_ADDR_LB */
  82         int s = cx25840_read(client, 0x801) << 8;
  83         s |= cx25840_read(client, 0x800);
  84
  85         if (size != s) {
  86                 v4l_err(client, "firmware %s load failed\n", firmware);
  87                 return -EINVAL;
  88         }
  89
  90         v4l_info(client, "loaded %s firmware (%d bytes)\n", firmware, size);
  91         return 0;
  92 }
  93
  94 static int fw_write(struct i2c_client *client, u8 * data, int size)
  95 {
  96         int sent;
  97
  98         if ((sent = i2c_master_send(client, data, size)) < size) {
  99
 100                 if (fastfw) {
 101                         v4l_err(client, "333MHz i2c firmware load failed\n");
 102                         fastfw = 0;
 103                         set_i2c_delay(client, 10);
 104
 105                         if (sent > 2) {
 106                                 u16 dl_addr = cx25840_read(client, 0x801) << 8;
 107                                 dl_addr |= cx25840_read(client, 0x800);
 108                                 dl_addr -= sent - 2;
 109                                 cx25840_write(client, 0x801, dl_addr >> 8);
 110                                 cx25840_write(client, 0x800, dl_addr & 0xff);
 111                         }
 112
 113                         if (i2c_master_send(client, data, size) < size) {
 114                                 v4l_err(client, "100MHz i2c firmware load failed\n");
 115                                 return -ENOSYS;
 116                         }
 117
 118                 } else {
 119                         v4l_err(client, "firmware load i2c failure\n");
 120                         return -ENOSYS;
 121                 }
 122
 123         }
 124
 125         return 0;
 126 }
 127
 128 int cx25840_loadfw(struct i2c_client *client)
 129 {
 130         const struct firmware *fw = NULL;
 131         u8 buffer[4], *ptr;
 132         int size, send, retval;
 133
 134         if (request_firmware(&fw, firmware, FWDEV(client)) != 0) {
 135                 v4l_err(client, "unable to open firmware %s\n", firmware);
 136                 return -EINVAL;
 137         }
 138
 139         start_fw_load(client);
 140
 141         buffer[0] = 0x08;
 142         buffer[1] = 0x02;
 143         buffer[2] = fw->data[0];
 144         buffer[3] = fw->data[1];
 145         retval = fw_write(client, buffer, 4);
 146
 147         if (retval < 0) {
 148                 release_firmware(fw);
 149                 return retval;
 150         }
 151
 152         size = fw->size - 2;
 153         ptr = fw->data;
 154         while (size > 0) {
 155                 ptr[0] = 0x08;
 156                 ptr[1] = 0x02;
 157                 send = size > (FWSEND - 2) ? FWSEND : size + 2;
 158                 retval = fw_write(client, ptr, send);
 159
 160                 if (retval < 0) {
 161                         release_firmware(fw);
 162                         return retval;
 163                 }
 164
 165                 size -= FWSEND - 2;
 166                 ptr += FWSEND - 2;
 167         }
 168
 169         end_fw_load(client);
 170
 171         size = fw->size;
 172         release_firmware(fw);
 173
 174         return check_fw_load(client, size);
 175 }