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/drv-intf/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 #define CX2388x_FIRMWARE "v4l-cx23885-avcore-01.fw" 65 #define CX231xx_FIRMWARE "v4l-cx231xx-avcore-01.fw" 66 #define CX25840_FIRMWARE "v4l-cx25840.fw" 67 68 static const char *get_fw_name(struct i2c_client *client) 69 { 70 struct cx25840_state *state = to_state(i2c_get_clientdata(client)); 71 72 if (firmware[0]) 73 return firmware; 74 if (is_cx2388x(state)) 75 return CX2388x_FIRMWARE; 76 if (is_cx231xx(state)) 77 return CX231xx_FIRMWARE; 78 return CX25840_FIRMWARE; 79 } 80 81 static int check_fw_load(struct i2c_client *client, int size) 82 { 83 /* DL_ADDR_HB DL_ADDR_LB */ 84 int s = cx25840_read(client, 0x801) << 8; 85 s |= cx25840_read(client, 0x800); 86 87 if (size != s) { 88 v4l_err(client, "firmware %s load failed\n", 89 get_fw_name(client)); 90 return -EINVAL; 91 } 92 93 v4l_info(client, "loaded %s firmware (%d bytes)\n", 94 get_fw_name(client), size); 95 return 0; 96 } 97 98 static int fw_write(struct i2c_client *client, const u8 *data, int size) 99 { 100 if (i2c_master_send(client, data, size) < size) { 101 v4l_err(client, "firmware load i2c failure\n"); 102 return -ENOSYS; 103 } 104 105 return 0; 106 } 107 108 int cx25840_loadfw(struct i2c_client *client) 109 { 110 struct cx25840_state *state = to_state(i2c_get_clientdata(client)); 111 const struct firmware *fw = NULL; 112 u8 buffer[FWSEND]; 113 const u8 *ptr; 114 const char *fwname = get_fw_name(client); 115 int size, retval; 116 int max_buf_size = FWSEND; 117 u32 gpio_oe = 0, gpio_da = 0; 118 119 if (is_cx2388x(state)) { 120 /* Preserve the GPIO OE and output bits */ 121 gpio_oe = cx25840_read(client, 0x160); 122 gpio_da = cx25840_read(client, 0x164); 123 } 124 125 /* cx231xx cannot accept more than 16 bytes at a time */ 126 if (is_cx231xx(state) && max_buf_size > 16) 127 max_buf_size = 16; 128 129 if (request_firmware(&fw, fwname, FWDEV(client)) != 0) { 130 v4l_err(client, "unable to open firmware %s\n", fwname); 131 return -EINVAL; 132 } 133 134 start_fw_load(client); 135 136 buffer[0] = 0x08; 137 buffer[1] = 0x02; 138 139 size = fw->size; 140 ptr = fw->data; 141 while (size > 0) { 142 int len = min(max_buf_size - 2, size); 143 144 memcpy(buffer + 2, ptr, len); 145 146 retval = fw_write(client, buffer, len + 2); 147 148 if (retval < 0) { 149 release_firmware(fw); 150 return retval; 151 } 152 153 size -= len; 154 ptr += len; 155 } 156 157 end_fw_load(client); 158 159 size = fw->size; 160 release_firmware(fw); 161 162 if (is_cx2388x(state)) { 163 /* Restore GPIO configuration after f/w load */ 164 cx25840_write(client, 0x160, gpio_oe); 165 cx25840_write(client, 0x164, gpio_da); 166 } 167 168 return check_fw_load(client, size); 169 } 170 171 MODULE_FIRMWARE(CX2388x_FIRMWARE); 172 MODULE_FIRMWARE(CX231xx_FIRMWARE); 173 MODULE_FIRMWARE(CX25840_FIRMWARE); 174 175