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it930x.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* ITE IT930x driver (it930x.c)
*
* Copyright (c) 2018-2021 nns779
*/
#include "print_format.h"
#include "it930x.h"
#ifdef __linux__
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/firmware.h>
#endif
struct it930x_i2c_master_info {
struct it930x_bridge *it930x;
u8 bus;
};
struct it930x_gpio_state {
bool enable;
enum it930x_gpio_mode mode;
};
struct it930x_priv {
struct mutex ctrl_lock;
struct mutex i2c_lock;
struct mutex gpio_lock;
u8 *buf;
u8 seq;
struct it930x_i2c_master_info i2c[3];
struct it930x_gpio_state status[16];
};
struct it930x_ctrl_buf {
u8 *buf;
u8 len;
};
static inline u8 it930x_reg_length(u32 reg)
{
if (reg & 0xff000000)
return 4;
if (reg & 0x00ff0000)
return 3;
if (reg & 0x0000ff00)
return 2;
return 1;
}
static u16 it930x_calc_checksum(void *buf, size_t len)
{
int i;
u8 *b;
u16 c = 0;
i = (int)(len / 2);
b = buf;
while (i--) {
c += ((b[0] << 8) | (b[1]));
b += 2;
}
if (len % 2)
c += (b[0] << 8);
return ~c;
}
static int it930x_ctrl_msg(struct it930x_bridge *it930x,
u16 cmd,
struct it930x_ctrl_buf *wbuf,
struct it930x_ctrl_buf *rbuf,
u8 *result, bool no_rx)
{
int ret;
struct it930x_priv *priv = it930x->priv;
u8 *buf, len, seq;
u16 csum, csum2;
int rlen = 256;
if (wbuf && wbuf->len > (255 - 3 - 2))
return -EINVAL;
mutex_lock(&priv->ctrl_lock);
buf = priv->buf;
len = 4 + 2;
if (wbuf)
len += wbuf->len;
seq = priv->seq++;
buf[0] = len - 1;
buf[1] = ((cmd >> 8) & 0xff);
buf[2] = (cmd & 0xff);
buf[3] = seq;
if (wbuf && wbuf->buf)
memcpy(&buf[4], wbuf->buf, wbuf->len);
csum = it930x_calc_checksum(&buf[1], (size_t)len - 1 - 2);
buf[len - 2] = ((csum >> 8) & 0xff);
buf[len - 1] = (csum & 0xff);
ret = itedtv_bus_ctrl_tx(&it930x->bus, buf, len);
if (ret)
goto exit;
if (no_rx)
goto exit;
ret = itedtv_bus_ctrl_rx(&it930x->bus, buf, &rlen);
if (ret)
goto exit;
if (rlen < 5) {
dev_err(it930x->dev,
"it930x_ctrl_msg: no enough response length. (rlen: %d)\n",
rlen);
ret = -EBADMSG;
goto exit;
}
csum = it930x_calc_checksum(&buf[1], (size_t)rlen - 1 - 2);
csum2 = ((buf[rlen - 2] << 8) | buf[rlen - 1]);
if (csum != csum2) {
dev_err(it930x->dev,
"it930x_ctrl_msg: checksum is incorrect. (0x%04x, 0x%04x)\n",
csum, csum2);
ret = -EBADMSG;
goto exit;
}
if (buf[1] != seq) {
dev_err(it930x->dev,
"it930x_ctrl_msg: sequence number is incorrect. (tx: 0x%02x, rx: 0x%02x, csum: 0x%04x)\n",
seq, buf[1], csum);
ret = -EBADMSG;
goto exit;
}
if (buf[2]) {
dev_err(it930x->dev,
"it930x_ctrl_msg: error returned. (result: %u, csum: 0x%04x)\n",
buf[2], csum);
ret = -EIO;
} else if (rbuf) {
if (rbuf->buf) {
rbuf->len = ((rlen - 3 - 2) > rbuf->len) ? rbuf->len
: (rlen - 3 - 2);
memcpy(rbuf->buf, &buf[3], rbuf->len);
} else {
rbuf->len = rlen - 3 - 2;
}
}
if (result)
*result = buf[2];
exit:
if (ret)
dev_err(it930x->dev,
"it930x_ctrl_msg: operation failed. (cmd: 0x%04x, ret: %d)\n",
cmd, ret);
mutex_unlock(&priv->ctrl_lock);
return ret;
}
int it930x_read_regs(struct it930x_bridge *it930x, u32 reg, u8 *rbuf, u8 len)
{
u8 buf[6];
struct it930x_ctrl_buf wb, rb;
if (!rbuf || !len || len > 251)
return -EINVAL;
buf[0] = len;
buf[1] = it930x_reg_length(reg);
buf[2] = ((reg >> 24) & 0xff);
buf[3] = ((reg >> 16) & 0xff);
buf[4] = ((reg >> 8) & 0xff);
buf[5] = (reg & 0xff);
wb.buf = buf;
wb.len = 6;
rb.buf = rbuf;
rb.len = len;
return it930x_ctrl_msg(it930x,
IT930X_CMD_REG_READ,
&wb, &rb,
NULL, false);
}
int it930x_read_reg(struct it930x_bridge *it930x, u32 reg, u8 *val)
{
return it930x_read_regs(it930x, reg, val, 1);
}
int it930x_write_regs(struct it930x_bridge *it930x, u32 reg, u8 *wbuf, u8 len)
{
u8 buf[250];
struct it930x_ctrl_buf wb;
if (!wbuf || !len || len > (250 - 6))
return -EINVAL;
buf[0] = len;
buf[1] = it930x_reg_length(reg);
buf[2] = ((reg >> 24) & 0xff);
buf[3] = ((reg >> 16) & 0xff);
buf[4] = ((reg >> 8) & 0xff);
buf[5] = (reg & 0xff);
memcpy(&buf[6], wbuf, len);
wb.buf = buf;
wb.len = 6 + len;
return it930x_ctrl_msg(it930x,
IT930X_CMD_REG_WRITE,
&wb, NULL,
NULL, false);
}
int it930x_write_reg(struct it930x_bridge *it930x, u32 reg, u8 val)
{
return it930x_write_regs(it930x, reg, &val, 1);
}
int it930x_write_reg_mask(struct it930x_bridge *it930x,
u32 reg,
u8 val, u8 mask)
{
int ret = 0;
u8 tmp;
if (!mask)
return -EINVAL;
if (mask != 0xff) {
ret = it930x_read_reg(it930x, reg, &tmp);
if (ret)
return ret;
tmp &= ~mask;
tmp |= (val & mask);
} else {
tmp = val;
}
return it930x_write_reg(it930x, reg, tmp);
}
static int it930x_i2c_master_request(void *i2c_priv,
const struct i2c_comm_request *req,
int num)
{
int ret = 0, i;
struct it930x_i2c_master_info *i2c = i2c_priv;
struct it930x_priv *priv = i2c->it930x->priv;
mutex_lock(&priv->i2c_lock);
for (i = 0; i < num; i++) {
u16 addr;
u8 *data;
int len;
u8 buf[250];
addr = req[i].addr;
data = req[i].data;
len = req[i].len;
if (!data || !len) {
ret = -EINVAL;
break;
}
switch (req[i].req) {
case I2C_READ_REQUEST:
{
struct it930x_ctrl_buf wb, rb;
if (len > 251) {
ret = -EINVAL;
break;
}
buf[0] = len;
buf[1] = i2c->bus;
buf[2] = (addr << 1);
wb.buf = buf;
wb.len = 3;
rb.buf = data;
rb.len = len;
ret = it930x_ctrl_msg(i2c->it930x,
IT930X_CMD_I2C_READ,
&wb, &rb,
NULL, false);
break;
}
case I2C_WRITE_REQUEST:
{
struct it930x_ctrl_buf wb;
if (len > (250 - 3)) {
ret = -EINVAL;
break;
}
buf[0] = len;
buf[1] = i2c->bus;
buf[2] = (addr << 1);
memcpy(&buf[3], data, len);
wb.buf = buf;
wb.len = 3 + len;
ret = it930x_ctrl_msg(i2c->it930x,
IT930X_CMD_I2C_WRITE,
&wb, NULL,
NULL, false);
break;
}
default:
ret = -EINVAL;
break;
}
if (ret)
break;
}
mutex_unlock(&priv->i2c_lock);
return ret;
}
static int it930x_read_firmware_version(struct it930x_bridge *it930x,
u32 *fw_version)
{
int ret = 0;
u8 buf[4];
struct it930x_ctrl_buf wb, rb;
buf[0] = 1;
wb.buf = buf;
wb.len = 1;
rb.buf = buf;
rb.len = 4;
ret = it930x_ctrl_msg(it930x,
IT930X_CMD_QUERYINFO,
&wb, &rb,
NULL, false);
if (!ret && fw_version)
*fw_version = (buf[0] << 24) | (buf[1] << 16) |
(buf[2] << 8) | buf[3];
return ret;
}
static int it930x_config_i2c(struct it930x_bridge *it930x)
{
u32 i2c_regs[5][2] = {
{ 0x4975, 0x4971 },
{ 0x4974, 0x4970 },
{ 0x4973, 0x496f },
{ 0x4972, 0x496e },
{ 0x4964, 0x4963 }
};
int ret = 0, i;
/* set i2c speed */
ret = it930x_write_reg(it930x, 0xf6a7, it930x->config.i2c_speed);
if (ret)
return ret;
ret = it930x_write_reg(it930x, 0xf103, it930x->config.i2c_speed);
if (ret)
return ret;
/* set i2c address and bus */
for(i = 0; i < 5; i++) {
struct it930x_stream_input *input = &it930x->config.input[i];
if (input->enable) {
ret = it930x_write_reg(it930x,
i2c_regs[input->slave_number][0],
input->i2c_addr << 1);
if (ret)
break;
ret = it930x_write_reg(it930x,
i2c_regs[input->slave_number][1],
input->i2c_bus);
if (ret)
break;
}
}
return ret;
}
static int it930x_config_stream_input(struct it930x_bridge *it930x)
{
int ret = 0, i;
for (i = 0; i < 5; i++) {
struct it930x_stream_input *input = &it930x->config.input[i];
if (!input->enable) {
/* disable input port */
ret = it930x_write_reg(it930x,
0xda4c + input->port_number, 0);
if (ret)
break;
continue;
}
if (input->port_number < 2) {
ret = it930x_write_reg(it930x,
0xda58 + input->port_number,
(input->is_parallel) ? 1 : 0);
if (ret)
break;
}
/* aggregation mode: sync byte */
ret = it930x_write_reg(it930x,
0xda73 + input->port_number, 1);
if (ret)
break;
/* set sync byte */
ret = it930x_write_reg(it930x,
0xda78 + input->port_number,
input->sync_byte);
if (ret)
break;
/* enable input port */
ret = it930x_write_reg(it930x,
0xda4c + input->port_number, 1);
if (ret)
break;
}
return ret;
}
static int it930x_config_stream_output(struct it930x_bridge *it930x)
{
int ret = 0, ret2 = 0;
ret = it930x_write_reg_mask(it930x, 0xda1d, 0x01, 0x01);
if (ret)
return ret;
switch (it930x->bus.type) {
case ITEDTV_BUS_USB:
{
u16 x;
u8 buf[2];
/* disable ep4 */
ret = it930x_write_reg_mask(it930x, 0xdd11, 0x00, 0x20);
if (ret)
goto exit;
/* disable nak of ep4 */
ret = it930x_write_reg_mask(it930x, 0xdd13, 0x00, 0x20);
if (ret)
goto exit;
/* enable ep4 */
ret = it930x_write_reg_mask(it930x, 0xdd11, 0x20, 0x20);
if (ret)
goto exit;
x = ((it930x->config.xfer_size / 4) & 0xffff);
buf[0] = (x & 0xff);
buf[1] = ((x >> 8) & 0xff);
/* threshold of transfer size */
ret = it930x_write_regs(it930x, 0xdd88, buf, 2);
if (ret)
goto exit;
/* max bulk packet size */
ret = it930x_write_reg(it930x,
0xdd0c,
(it930x->bus.usb.max_bulk_size / 4) & 0xff);
if (ret)
goto exit;
ret = it930x_write_reg_mask(it930x, 0xda05, 0x00, 0x01);
if (ret)
goto exit;
ret = it930x_write_reg_mask(it930x, 0xda06, 0x00, 0x01);
if (ret)
goto exit;
break;
}
default:
break;
}
exit:
ret2 = it930x_write_reg_mask(it930x, 0xda1d, 0x00, 0x01);
/* reverse: no */
ret2 = it930x_write_reg(it930x, 0xd920, 0);
return (ret) ? ret : ret2;
}
int it930x_init(struct it930x_bridge *it930x)
{
int ret = 0;
struct it930x_priv *priv;
u8 *buf = NULL;
int i;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv) {
ret = -ENOMEM;
goto fail;
}
buf = kmalloc(sizeof(u8) * 256, GFP_KERNEL);
if (!buf) {
ret = -ENOMEM;
goto fail;
}
mutex_init(&priv->ctrl_lock);
mutex_init(&priv->i2c_lock);
mutex_init(&priv->gpio_lock);
priv->buf = buf;
/* setup the i2c operator */
for (i = 0; i < 3; i++) {
priv->i2c[i].it930x = it930x;
priv->i2c[i].bus = i + 1;
it930x->i2c_master[i].gate_ctrl = NULL;
it930x->i2c_master[i].request = it930x_i2c_master_request;
it930x->i2c_master[i].priv = &priv->i2c[i];
}
it930x->priv = priv;
return 0;
fail:
if (buf)
kfree(buf);
if (priv)
kfree(priv);
return ret;
}
int it930x_term(struct it930x_bridge *it930x)
{
int i;
struct it930x_priv *priv = it930x->priv;
if (priv->buf)
kfree(priv->buf);
/* clear the i2c operator */
for (i = 0; i < 3; i++) {
it930x->i2c_master[i].gate_ctrl = NULL;
it930x->i2c_master[i].request = NULL;
it930x->i2c_master[i].priv = NULL;
}
mutex_destroy(&priv->ctrl_lock);
mutex_destroy(&priv->i2c_lock);
mutex_destroy(&priv->gpio_lock);
kfree(priv);
it930x->priv = NULL;
return 0;
}
int it930x_raise(struct it930x_bridge *it930x)
{
int ret = 0, i;
for (i = 0; i < 5; i++) {
ret = it930x_read_firmware_version(it930x, NULL);
if (!ret)
break;
}
return ret;
}
int it930x_load_firmware(struct it930x_bridge *it930x, const char *filename)
{
int ret = 0;
u32 fw_version;
const struct firmware *fw;
size_t i, n, len = 0;
struct it930x_ctrl_buf wb;
if (!filename)
return -EINVAL;
ret = it930x_read_firmware_version(it930x, &fw_version);
if (ret) {
dev_err(it930x->dev,
"it930x_load_firmware: it930x_read_firmware_version() failed. 1 (ret: %d)\n",
ret);
return ret;
}
if (fw_version) {
dev_info(it930x->dev,
"Firmware is already loaded. version: %d.%d.%d.%d\n",
(fw_version >> 24) & 0xff, (fw_version >> 16) & 0xff,
(fw_version >> 8) & 0xff, fw_version & 0xff);
return ret;
}
ret = it930x_write_reg(it930x, 0xf103, it930x->config.i2c_speed);
if (ret) {
dev_err(it930x->dev,
"it930x_load_firmware: it930x_write_reg(0xf103) failed. (ret: %d)\n",
ret);
return ret;
}
ret = request_firmware(&fw, filename, it930x->dev);
if (ret) {
dev_err(it930x->dev,
"it930x_load_firmware: request_firmware() failed. (ret: %d)\n",
ret);
dev_err(it930x->dev,
"Couldn't load firmware from the file.\n");
return ret;
}
n = fw->size;
for (i = 0; i < n; i += len) {
const u8 *p = &fw->data[i];
unsigned j, m = p[3];
len = 0;
if (p[0] != 0x03) {
dev_err(it930x->dev,
"it930x_load_firmware: Invalid firmware block was found. Abort. (ofs: %zx)\n",
i);
ret = -ECANCELED;
goto exit;
}
for(j = 0; j < m; j++)
len += p[6 + (j * 3)];
if (!len) {
dev_warn(it930x->dev,
"it930x_load_firmware: No data in the block. (ofs: %zx)\n",
i);
continue;
}
len += 4 + ((size_t)m * 3);
/* send firmware block */
wb.buf = (u8 *)p;
wb.len = (u8)len;
ret = it930x_ctrl_msg(it930x,
IT930X_CMD_FW_SCATTER_WRITE,
&wb, NULL,
NULL, false);
if (ret) {
dev_err(it930x->dev,
"it930x_load_firmware: it930x_ctrl_msg(IT930X_CMD_FW_SCATTER_WRITE) failed. (ofs: %zx, ret: %d)\n",
i, ret);
goto exit;
}
}
ret = it930x_ctrl_msg(it930x, IT930X_CMD_BOOT, NULL, NULL, NULL, false);
if (ret) {
dev_err(it930x->dev,
"it930x_load_firmware: it930x_ctrl_msg(IT930X_CMD_BOOT) failed. (ret: %d)\n",
ret);
goto exit;
}
ret = it930x_read_firmware_version(it930x, &fw_version);
if (ret) {
dev_err(it930x->dev,
"it930x_load_firmware: it930x_read_firmware_version() failed. 2 (ret: %d)\n",
ret);
goto exit;
}
if (!fw_version) {
ret = -EIO;
goto exit;
}
dev_info(it930x->dev,
"Firmware loaded. version: %d.%d.%d.%d\n",
(fw_version >> 24) & 0xff, (fw_version >> 16) & 0xff,
(fw_version >> 8) & 0xff, fw_version & 0xff);
exit:
release_firmware(fw);
return ret;
}
int it930x_init_warm(struct it930x_bridge *it930x)
{
int ret = 0;
if (it930x->bus.type != ITEDTV_BUS_USB) {
dev_dbg(it930x->dev,
"it930x_init_warm: This driver only supports USB.\n");
return -EINVAL;
}
ret = it930x_write_reg(it930x, 0x4976, 0);
if (ret)
return ret;
ret = it930x_write_reg(it930x, 0x4bfb, 0);
if (ret)
return ret;
ret = it930x_write_reg(it930x, 0x4978, 0);
if (ret)
return ret;
ret = it930x_write_reg(it930x, 0x4977, 0);
if (ret)
return ret;
/* ignore sync byte: no */
ret = it930x_write_reg(it930x, 0xda1a, 0);
if (ret)
return ret;
/* dvb-t interrupt: enable */
ret = it930x_write_reg_mask(it930x, 0xf41f, 0x04, 0x04);
if (ret)
return ret;
/* mpeg full speed */
ret = it930x_write_reg_mask(it930x, 0xda10, 0x00, 0x01);
if (ret)
return ret;
/* dvb-t mode: enable */
ret = it930x_write_reg_mask(it930x, 0xf41a, 0x01, 0x01);
if (ret)
return ret;
ret = it930x_config_stream_output(it930x);
if (ret) {
dev_err(it930x->dev,
"it930x_init_warm: it930x_config_stream_output() failed. (ret: %d)\n",
ret);
return ret;
}
/* power config ? */
ret = it930x_write_reg(it930x, 0xd833, 1);
if (ret)
return ret;
ret = it930x_write_reg(it930x, 0xd830, 0);
if (ret)
return ret;
ret = it930x_write_reg(it930x, 0xd831, 1);
if (ret)
return ret;
ret = it930x_write_reg(it930x, 0xd832, 0);
if (ret)
return ret;
ret = it930x_config_i2c(it930x);
if (ret) {
dev_err(it930x->dev,
"it930x_init_warm: it930x_config_i2c() failed. (ret: %d)\n",
ret);
return ret;
}
ret = it930x_config_stream_input(it930x);
if (ret) {
dev_err(it930x->dev,
"it930x_init_warm: it930x_config_stream_input() failed. (ret: %d)\n",
ret);
return ret;
}
return 0;
}
int it930x_set_gpio_mode(struct it930x_bridge *it930x,
int gpio,
enum it930x_gpio_mode mode,
bool enable)
{
/* GPIO mode registers (gpioh1 to gpioh16) */
u32 gpio_en_regs[] = {
0xd8b0,
0xd8b8,
0xd8b4,
0xd8c0,
0xd8bc,
0xd8c8,
0xd8c4,
0xd8d0,
0xd8cc,
0xd8d8,
0xd8d4,
0xd8e0,
0xd8dc,
0xd8e4,
0xd8e8,
0xd8ec,
};
int ret = 0;
struct it930x_priv *priv = it930x->priv;
u8 val;
if (gpio <= 0 || gpio > ARRAY_SIZE(gpio_en_regs))
return -EINVAL;
switch (mode) {
case IT930X_GPIO_IN:
val = 0;
break;
case IT930X_GPIO_OUT:
val = 1;
break;
default:
return -EINVAL;
}
gpio--;
mutex_lock(&priv->gpio_lock);
if (priv->status[gpio].mode == mode)
goto exit;
priv->status[gpio].mode = mode;
ret = it930x_write_reg(it930x, gpio_en_regs[gpio], val);
if (ret)
goto exit;
if (!enable || priv->status[gpio].enable)
goto exit;
priv->status[gpio].enable = true;
ret = it930x_write_reg(it930x, gpio_en_regs[gpio] + 1, 1);
exit:
mutex_unlock(&priv->gpio_lock);
return ret;
}
int it930x_enable_gpio(struct it930x_bridge *it930x, int gpio, bool enable)
{
/* GPIO enable/disable registers (gpioh1 to gpioh16) */
u32 gpio_on_regs[] = {
0xd8b1,
0xd8b9,
0xd8b5,
0xd8c1,
0xd8bd,
0xd8c9,
0xd8c5,
0xd8d1,
0xd8cd,
0xd8d9,
0xd8d5,
0xd8e1,
0xd8dd,
0xd8e5,
0xd8e9,
0xd8ed,
};
int ret = 0;
struct it930x_priv *priv = it930x->priv;
if (gpio <= 0 || gpio > ARRAY_SIZE(gpio_on_regs))
return -EINVAL;
gpio--;
mutex_lock(&priv->gpio_lock);
if ((!priv->status[gpio].enable && !enable) ||
(priv->status[gpio].enable && enable))
goto exit;
priv->status[gpio].enable = (enable) ? true : false;
ret = it930x_write_reg(it930x, gpio_on_regs[gpio], (enable) ? 1 : 0);
exit:
mutex_unlock(&priv->gpio_lock);
return ret;
}
int it930x_read_gpio(struct it930x_bridge *it930x, int gpio, bool *high)
{
/* GPIO input registers (gpioh1 to gpioh16) */
u32 gpio_i_regs[] = {
0xd8ae,
0xd8b6,
0xd8b2,
0xd8be,
0xd8ba,
0xd8c6,
0xd8c2,
0xd8ce,
0xd8ca,
0xd8d6,
0xd8d2,
0xd8de,
0xd8da,
0xd8e2,
0xd8e6,
0xd8ea,
};
int ret = 0;
struct it930x_priv *priv = it930x->priv;
u8 tmp;
if (gpio <= 0 || gpio > ARRAY_SIZE(gpio_i_regs))
return -EINVAL;
gpio--;
mutex_lock(&priv->gpio_lock);
if (priv->status[gpio].mode == IT930X_GPIO_IN) {
ret = it930x_read_reg(it930x, gpio_i_regs[gpio], &tmp);
if (!ret)
*high = (tmp) ? true : false;
} else {
ret = -EINVAL;
}
mutex_unlock(&priv->gpio_lock);