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 39static char *firmware = ""; 40 41module_param(firmware, charp, 0444); 42 43MODULE_PARM_DESC(firmware, "Firmware image to load"); 44 45static 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 56static 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 64static 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 "v4l-cx23885-avcore-01.fw"; 72 if (is_cx231xx(state)) 73 return "v4l-cx231xx-avcore-01.fw"; 74 return "v4l-cx25840.fw"; 75} 76 77static 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 94static 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 104int 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 if (is_cx231xx(state) && 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 (is_cx2388x(state)) { 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} 167