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161 lines
3.8 KiB
161 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* cx25840 firmware functions |
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*/ |
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#include <linux/module.h> |
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#include <linux/i2c.h> |
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#include <linux/firmware.h> |
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#include <media/v4l2-common.h> |
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#include <media/drv-intf/cx25840.h> |
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#include "cx25840-core.h" |
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/* |
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* Mike Isely <[email protected]> - The FWSEND parameter controls the |
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* size of the firmware chunks sent down the I2C bus to the chip. |
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* Previously this had been set to 1024 but unfortunately some I2C |
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* implementations can't transfer data in such big gulps. |
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* Specifically, the pvrusb2 driver has a hard limit of around 60 |
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* bytes, due to the encapsulation there of I2C traffic into USB |
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* messages. So we have to significantly reduce this parameter. |
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*/ |
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#define FWSEND 48 |
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#define FWDEV(x) &((x)->dev) |
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static char *firmware = ""; |
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module_param(firmware, charp, 0444); |
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MODULE_PARM_DESC(firmware, "Firmware image to load"); |
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static void start_fw_load(struct i2c_client *client) |
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{ |
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/* DL_ADDR_LB=0 DL_ADDR_HB=0 */ |
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cx25840_write(client, 0x800, 0x00); |
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cx25840_write(client, 0x801, 0x00); |
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// DL_MAP=3 DL_AUTO_INC=0 DL_ENABLE=1 |
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cx25840_write(client, 0x803, 0x0b); |
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/* AUTO_INC_DIS=1 */ |
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cx25840_write(client, 0x000, 0x20); |
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} |
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static void end_fw_load(struct i2c_client *client) |
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{ |
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/* AUTO_INC_DIS=0 */ |
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cx25840_write(client, 0x000, 0x00); |
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/* DL_ENABLE=0 */ |
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cx25840_write(client, 0x803, 0x03); |
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} |
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#define CX2388x_FIRMWARE "v4l-cx23885-avcore-01.fw" |
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#define CX231xx_FIRMWARE "v4l-cx231xx-avcore-01.fw" |
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#define CX25840_FIRMWARE "v4l-cx25840.fw" |
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static const char *get_fw_name(struct i2c_client *client) |
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{ |
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struct cx25840_state *state = to_state(i2c_get_clientdata(client)); |
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if (firmware[0]) |
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return firmware; |
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if (is_cx2388x(state)) |
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return CX2388x_FIRMWARE; |
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if (is_cx231xx(state)) |
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return CX231xx_FIRMWARE; |
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return CX25840_FIRMWARE; |
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} |
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static int check_fw_load(struct i2c_client *client, int size) |
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{ |
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/* DL_ADDR_HB DL_ADDR_LB */ |
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int s = cx25840_read(client, 0x801) << 8; |
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s |= cx25840_read(client, 0x800); |
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if (size != s) { |
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v4l_err(client, "firmware %s load failed\n", |
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get_fw_name(client)); |
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return -EINVAL; |
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} |
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v4l_info(client, "loaded %s firmware (%d bytes)\n", |
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get_fw_name(client), size); |
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return 0; |
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} |
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static int fw_write(struct i2c_client *client, const u8 *data, int size) |
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{ |
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if (i2c_master_send(client, data, size) < size) { |
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v4l_err(client, "firmware load i2c failure\n"); |
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return -ENOSYS; |
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} |
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return 0; |
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} |
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int cx25840_loadfw(struct i2c_client *client) |
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{ |
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struct cx25840_state *state = to_state(i2c_get_clientdata(client)); |
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const struct firmware *fw = NULL; |
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u8 buffer[FWSEND]; |
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const u8 *ptr; |
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const char *fwname = get_fw_name(client); |
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int size, retval; |
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int max_buf_size = FWSEND; |
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u32 gpio_oe = 0, gpio_da = 0; |
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if (is_cx2388x(state)) { |
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/* Preserve the GPIO OE and output bits */ |
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gpio_oe = cx25840_read(client, 0x160); |
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gpio_da = cx25840_read(client, 0x164); |
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} |
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/* cx231xx cannot accept more than 16 bytes at a time */ |
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if (is_cx231xx(state) && max_buf_size > 16) |
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max_buf_size = 16; |
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if (request_firmware(&fw, fwname, FWDEV(client)) != 0) { |
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v4l_err(client, "unable to open firmware %s\n", fwname); |
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return -EINVAL; |
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} |
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start_fw_load(client); |
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buffer[0] = 0x08; |
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buffer[1] = 0x02; |
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size = fw->size; |
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ptr = fw->data; |
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while (size > 0) { |
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int len = min(max_buf_size - 2, size); |
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memcpy(buffer + 2, ptr, len); |
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retval = fw_write(client, buffer, len + 2); |
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if (retval < 0) { |
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release_firmware(fw); |
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return retval; |
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} |
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size -= len; |
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ptr += len; |
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} |
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end_fw_load(client); |
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size = fw->size; |
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release_firmware(fw); |
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if (is_cx2388x(state)) { |
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/* Restore GPIO configuration after f/w load */ |
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cx25840_write(client, 0x160, gpio_oe); |
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cx25840_write(client, 0x164, gpio_da); |
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} |
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return check_fw_load(client, size); |
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} |
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MODULE_FIRMWARE(CX2388x_FIRMWARE); |
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MODULE_FIRMWARE(CX231xx_FIRMWARE); |
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MODULE_FIRMWARE(CX25840_FIRMWARE); |
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