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/firmware.h>
  21 #include <media/v4l2-common.h>
  22 #include <media/cx25840.h>
  23
  24 #include "cx25840-core.h"
  25
  26 /*
  27  * Mike Isely <isely@pobox.com> - The FWSEND parameter controls the
  28  * size of the firmware chunks sent down the I2C bus to the chip.
  29  * Previously this had been set to 1024 but unfortunately some I2C
  30  * implementations can't transfer data in such big gulps.
  31  * Specifically, the pvrusb2 driver has a hard limit of around 60
  32  * bytes, due to the encapsulation there of I2C traffic into USB
  33  * messages.  So we have to significantly reduce this parameter.
  34  */
  35 #define FWSEND 48
  36
  37 #define FWDEV(x) &((x)->dev)
  38
  39 static char *firmware = "";
  40
  41 module_param(firmware, charp, 0444);
  42
  43 MODULE_PARM_DESC(firmware, "Firmware image to load");
  44
  45 static void start_fw_load(struct i2c_client *client)
  46 {
  47         /* DL_ADDR_LB=0 DL_ADDR_HB=0 */
  48         cx25840_write(client, 0x800, 0x00);
  49         cx25840_write(client, 0x801, 0x00);
  50         // DL_MAP=3 DL_AUTO_INC=0 DL_ENABLE=1
  51         cx25840_write(client, 0x803, 0x0b);
  52         /* AUTO_INC_DIS=1 */
  53         cx25840_write(client, 0x000, 0x20);
  54 }
  55
  56 static void end_fw_load(struct i2c_client *client)
  57 {
  58         /* AUTO_INC_DIS=0 */
  59         cx25840_write(client, 0x000, 0x00);
  60         /* DL_ENABLE=0 */
  61         cx25840_write(client, 0x803, 0x03);
  62 }
  63
  64 static const char *get_fw_name(struct i2c_client *client)
  65 {
  66         struct cx25840_state *state = to_state(i2c_get_clientdata(client));
  67
  68         if (firmware[0])
  69                 return firmware;
  70         if (state->is_cx23885)
  71                 return "v4l-cx23885-avcore-01.fw";
  72         if (state->is_cx231xx)
  73                 return "v4l-cx231xx-avcore-01.fw";
  74         return "v4l-cx25840.fw";
  75 }
  76
  77 static int check_fw_load(struct i2c_client *client, int size)
  78 {
  79         /* DL_ADDR_HB DL_ADDR_LB */
  80         int s = cx25840_read(client, 0x801) << 8;
  81         s |= cx25840_read(client, 0x800);
  82
  83         if (size != s) {
  84                 v4l_err(client, "firmware %s load failed\n",
  85                                 get_fw_name(client));
  86                 return -EINVAL;
  87         }
  88
  89         v4l_info(client, "loaded %s firmware (%d bytes)\n",
  90                         get_fw_name(client), size);
  91         return 0;
  92 }
  93
  94 static int fw_write(struct i2c_client *client, const u8 *data, int size)
  95 {
  96         if (i2c_master_send(client, data, size) < size) {
  97                 v4l_err(client, "firmware load i2c failure\n");
  98                 return -ENOSYS;
  99         }
 100
 101         return 0;
 102 }
 103
 104 int cx25840_loadfw(struct i2c_client *client)
 105 {
 106         struct cx25840_state *state = to_state(i2c_get_clientdata(client));
 107         const struct firmware *fw = NULL;
 108         u8 buffer[FWSEND];
 109         const u8 *ptr;
 110         const char *fwname = get_fw_name(client);
 111         int size, retval;
 112         int MAX_BUF_SIZE = FWSEND;
 113         u32 gpio_oe = 0, gpio_da = 0;
 114
 115         if (state->is_cx23885) {
 116                 /* Preserve the GPIO OE and output bits */
 117                 gpio_oe = cx25840_read(client, 0x160);
 118                 gpio_da = cx25840_read(client, 0x164);
 119         }
 120
 121         if ((state->is_cx231xx) && MAX_BUF_SIZE > 16) {
 122                 v4l_err(client, " Firmware download size changed to 16 bytes max length\n");
 123                 MAX_BUF_SIZE = 16;  /* cx231xx cannot accept more than 16 bytes at a time */
 124         }
 125
 126         if (request_firmware(&fw, fwname, FWDEV(client)) != 0) {
 127                 v4l_err(client, "unable to open firmware %s\n", fwname);
 128                 return -EINVAL;
 129         }
 130
 131         start_fw_load(client);
 132
 133         buffer[0] = 0x08;
 134         buffer[1] = 0x02;
 135
 136         size = fw->size;
 137         ptr = fw->data;
 138         while (size > 0) {
 139                 int len = min(MAX_BUF_SIZE - 2, size);
 140
 141                 memcpy(buffer + 2, ptr, len);
 142
 143                 retval = fw_write(client, buffer, len + 2);
 144
 145                 if (retval < 0) {
 146                         release_firmware(fw);
 147                         return retval;
 148                 }
 149
 150                 size -= len;
 151                 ptr += len;
 152         }
 153
 154         end_fw_load(client);
 155
 156         size = fw->size;
 157         release_firmware(fw);
 158
 159         if (state->is_cx23885) {
 160                 /* Restore GPIO configuration after f/w load */
 161                 cx25840_write(client, 0x160, gpio_oe);
 162                 cx25840_write(client, 0x164, gpio_da);
 163         }
 164
 165         return check_fw_load(client, size);
 166 }