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