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1// SPDX-License-Identifier: GPL-2.0-or-later2/* cx25840 firmware functions3 */4 5#include <linux/module.h>6#include <linux/i2c.h>7#include <linux/firmware.h>8#include <media/v4l2-common.h>9#include <media/drv-intf/cx25840.h>10 11#include "cx25840-core.h"12 13/*14 * Mike Isely <isely@pobox.com> - The FWSEND parameter controls the15 * size of the firmware chunks sent down the I2C bus to the chip.16 * Previously this had been set to 1024 but unfortunately some I2C17 * implementations can't transfer data in such big gulps.18 * Specifically, the pvrusb2 driver has a hard limit of around 6019 * bytes, due to the encapsulation there of I2C traffic into USB20 * messages. So we have to significantly reduce this parameter.21 */22#define FWSEND 4823 24#define FWDEV(x) &((x)->dev)25 26static char *firmware = "";27 28module_param(firmware, charp, 0444);29 30MODULE_PARM_DESC(firmware, "Firmware image to load");31 32static void start_fw_load(struct i2c_client *client)33{34 /* DL_ADDR_LB=0 DL_ADDR_HB=0 */35 cx25840_write(client, 0x800, 0x00);36 cx25840_write(client, 0x801, 0x00);37 // DL_MAP=3 DL_AUTO_INC=0 DL_ENABLE=138 cx25840_write(client, 0x803, 0x0b);39 /* AUTO_INC_DIS=1 */40 cx25840_write(client, 0x000, 0x20);41}42 43static void end_fw_load(struct i2c_client *client)44{45 /* AUTO_INC_DIS=0 */46 cx25840_write(client, 0x000, 0x00);47 /* DL_ENABLE=0 */48 cx25840_write(client, 0x803, 0x03);49}50 51#define CX2388x_FIRMWARE "v4l-cx23885-avcore-01.fw"52#define CX231xx_FIRMWARE "v4l-cx231xx-avcore-01.fw"53#define CX25840_FIRMWARE "v4l-cx25840.fw"54 55static const char *get_fw_name(struct i2c_client *client)56{57 struct cx25840_state *state = to_state(i2c_get_clientdata(client));58 59 if (firmware[0])60 return firmware;61 if (is_cx2388x(state))62 return CX2388x_FIRMWARE;63 if (is_cx231xx(state))64 return CX231xx_FIRMWARE;65 return CX25840_FIRMWARE;66}67 68static int check_fw_load(struct i2c_client *client, int size)69{70 /* DL_ADDR_HB DL_ADDR_LB */71 int s = cx25840_read(client, 0x801) << 8;72 s |= cx25840_read(client, 0x800);73 74 if (size != s) {75 v4l_err(client, "firmware %s load failed\n",76 get_fw_name(client));77 return -EINVAL;78 }79 80 v4l_info(client, "loaded %s firmware (%d bytes)\n",81 get_fw_name(client), size);82 return 0;83}84 85static int fw_write(struct i2c_client *client, const u8 *data, int size)86{87 if (i2c_master_send(client, data, size) < size) {88 v4l_err(client, "firmware load i2c failure\n");89 return -ENOSYS;90 }91 92 return 0;93}94 95int cx25840_loadfw(struct i2c_client *client)96{97 struct cx25840_state *state = to_state(i2c_get_clientdata(client));98 const struct firmware *fw = NULL;99 u8 buffer[FWSEND];100 const u8 *ptr;101 const char *fwname = get_fw_name(client);102 int size, retval;103 int max_buf_size = FWSEND;104 u32 gpio_oe = 0, gpio_da = 0;105 106 if (is_cx2388x(state)) {107 /* Preserve the GPIO OE and output bits */108 gpio_oe = cx25840_read(client, 0x160);109 gpio_da = cx25840_read(client, 0x164);110 }111 112 /* cx231xx cannot accept more than 16 bytes at a time */113 if (is_cx231xx(state) && max_buf_size > 16)114 max_buf_size = 16;115 116 if (request_firmware(&fw, fwname, FWDEV(client)) != 0) {117 v4l_err(client, "unable to open firmware %s\n", fwname);118 return -EINVAL;119 }120 121 start_fw_load(client);122 123 buffer[0] = 0x08;124 buffer[1] = 0x02;125 126 size = fw->size;127 ptr = fw->data;128 while (size > 0) {129 int len = min(max_buf_size - 2, size);130 131 memcpy(buffer + 2, ptr, len);132 133 retval = fw_write(client, buffer, len + 2);134 135 if (retval < 0) {136 release_firmware(fw);137 return retval;138 }139 140 size -= len;141 ptr += len;142 }143 144 end_fw_load(client);145 146 size = fw->size;147 release_firmware(fw);148 149 if (is_cx2388x(state)) {150 /* Restore GPIO configuration after f/w load */151 cx25840_write(client, 0x160, gpio_oe);152 cx25840_write(client, 0x164, gpio_da);153 }154 155 return check_fw_load(client, size);156}157 158MODULE_FIRMWARE(CX2388x_FIRMWARE);159MODULE_FIRMWARE(CX231xx_FIRMWARE);160MODULE_FIRMWARE(CX25840_FIRMWARE);161 162