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 14 #include <linux/module.h> 15 #include <linux/i2c.h> 16 #include <linux/firmware.h> 17 #include <media/v4l2-common.h> 18 #include <media/drv-intf/cx25840.h> 19 20 #include "cx25840-core.h" 21 22 /* 23 * Mike Isely <isely@pobox.com> - The FWSEND parameter controls the 24 * size of the firmware chunks sent down the I2C bus to the chip. 25 * Previously this had been set to 1024 but unfortunately some I2C 26 * implementations can't transfer data in such big gulps. 27 * Specifically, the pvrusb2 driver has a hard limit of around 60 28 * bytes, due to the encapsulation there of I2C traffic into USB 29 * messages. So we have to significantly reduce this parameter. 30 */ 31 #define FWSEND 48 32 33 #define FWDEV(x) &((x)->dev) 34 35 static char *firmware = ""; 36 37 module_param(firmware, charp, 0444); 38 39 MODULE_PARM_DESC(firmware, "Firmware image to load"); 40 41 static void start_fw_load(struct i2c_client *client) 42 { 43 /* DL_ADDR_LB=0 DL_ADDR_HB=0 */ 44 cx25840_write(client, 0x800, 0x00); 45 cx25840_write(client, 0x801, 0x00); 46 // DL_MAP=3 DL_AUTO_INC=0 DL_ENABLE=1 47 cx25840_write(client, 0x803, 0x0b); 48 /* AUTO_INC_DIS=1 */ 49 cx25840_write(client, 0x000, 0x20); 50 } 51 52 static void end_fw_load(struct i2c_client *client) 53 { 54 /* AUTO_INC_DIS=0 */ 55 cx25840_write(client, 0x000, 0x00); 56 /* DL_ENABLE=0 */ 57 cx25840_write(client, 0x803, 0x03); 58 } 59 60 #define CX2388x_FIRMWARE "v4l-cx23885-avcore-01.fw" 61 #define CX231xx_FIRMWARE "v4l-cx231xx-avcore-01.fw" 62 #define CX25840_FIRMWARE "v4l-cx25840.fw" 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 (is_cx2388x(state)) 71 return CX2388x_FIRMWARE; 72 if (is_cx231xx(state)) 73 return CX231xx_FIRMWARE; 74 return CX25840_FIRMWARE; 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 (is_cx2388x(state)) { 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 /* cx231xx cannot accept more than 16 bytes at a time */ 122 if (is_cx231xx(state) && max_buf_size > 16) 123 max_buf_size = 16; 124 125 if (request_firmware(&fw, fwname, FWDEV(client)) != 0) { 126 v4l_err(client, "unable to open firmware %s\n", fwname); 127 return -EINVAL; 128 } 129 130 start_fw_load(client); 131 132 buffer[0] = 0x08; 133 buffer[1] = 0x02; 134 135 size = fw->size; 136 ptr = fw->data; 137 while (size > 0) { 138 int len = min(max_buf_size - 2, size); 139 140 memcpy(buffer + 2, ptr, len); 141 142 retval = fw_write(client, buffer, len + 2); 143 144 if (retval < 0) { 145 release_firmware(fw); 146 return retval; 147 } 148 149 size -= len; 150 ptr += len; 151 } 152 153 end_fw_load(client); 154 155 size = fw->size; 156 release_firmware(fw); 157 158 if (is_cx2388x(state)) { 159 /* Restore GPIO configuration after f/w load */ 160 cx25840_write(client, 0x160, gpio_oe); 161 cx25840_write(client, 0x164, gpio_da); 162 } 163 164 return check_fw_load(client, size); 165 } 166 167 MODULE_FIRMWARE(CX2388x_FIRMWARE); 168 MODULE_FIRMWARE(CX231xx_FIRMWARE); 169 MODULE_FIRMWARE(CX25840_FIRMWARE); 170 171