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linux-stable/drivers/media/i2c/ds90ub953.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Driver for the Texas Instruments DS90UB953 video serializer
*
* Based on a driver from Luca Ceresoli <luca@lucaceresoli.net>
*
* Copyright (c) 2019 Luca Ceresoli <luca@lucaceresoli.net>
* Copyright (c) 2023 Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
*/
#include <linux/clk-provider.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/fwnode.h>
#include <linux/gpio/driver.h>
#include <linux/i2c-atr.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/math64.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/rational.h>
#include <linux/regmap.h>
#include <media/i2c/ds90ub9xx.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-mediabus.h>
#include <media/v4l2-subdev.h>
#define UB953_PAD_SINK 0
#define UB953_PAD_SOURCE 1
#define UB953_NUM_GPIOS 4
#define UB953_DEFAULT_CLKOUT_RATE 25000000UL
#define UB953_REG_RESET_CTL 0x01
#define UB953_REG_RESET_CTL_DIGITAL_RESET_1 BIT(1)
#define UB953_REG_RESET_CTL_DIGITAL_RESET_0 BIT(0)
#define UB953_REG_GENERAL_CFG 0x02
#define UB953_REG_GENERAL_CFG_CONT_CLK BIT(6)
#define UB953_REG_GENERAL_CFG_CSI_LANE_SEL_SHIFT 4
#define UB953_REG_GENERAL_CFG_CSI_LANE_SEL_MASK GENMASK(5, 4)
#define UB953_REG_GENERAL_CFG_CRC_TX_GEN_ENABLE BIT(1)
#define UB953_REG_GENERAL_CFG_I2C_STRAP_MODE BIT(0)
#define UB953_REG_MODE_SEL 0x03
#define UB953_REG_MODE_SEL_MODE_DONE BIT(3)
#define UB953_REG_MODE_SEL_MODE_OVERRIDE BIT(4)
#define UB953_REG_MODE_SEL_MODE_MASK GENMASK(2, 0)
#define UB953_REG_CLKOUT_CTRL0 0x06
#define UB953_REG_CLKOUT_CTRL1 0x07
#define UB953_REG_SCL_HIGH_TIME 0x0b
#define UB953_REG_SCL_LOW_TIME 0x0c
#define UB953_REG_LOCAL_GPIO_DATA 0x0d
#define UB953_REG_LOCAL_GPIO_DATA_GPIO_RMTEN(n) BIT(4 + (n))
#define UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(n) BIT(0 + (n))
#define UB953_REG_GPIO_INPUT_CTRL 0x0e
#define UB953_REG_GPIO_INPUT_CTRL_OUT_EN(n) BIT(4 + (n))
#define UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(n) BIT(0 + (n))
#define UB953_REG_REV_MASK_ID 0x50
#define UB953_REG_GENERAL_STATUS 0x52
#define UB953_REG_GPIO_PIN_STS 0x53
#define UB953_REG_GPIO_PIN_STS_GPIO_STS(n) BIT(0 + (n))
#define UB953_REG_BIST_ERR_CNT 0x54
#define UB953_REG_CRC_ERR_CNT1 0x55
#define UB953_REG_CRC_ERR_CNT2 0x56
#define UB953_REG_CSI_ERR_CNT 0x5c
#define UB953_REG_CSI_ERR_STATUS 0x5d
#define UB953_REG_CSI_ERR_DLANE01 0x5e
#define UB953_REG_CSI_ERR_DLANE23 0x5f
#define UB953_REG_CSI_ERR_CLK_LANE 0x60
#define UB953_REG_CSI_PKT_HDR_VC_ID 0x61
#define UB953_REG_PKT_HDR_WC_LSB 0x62
#define UB953_REG_PKT_HDR_WC_MSB 0x63
#define UB953_REG_CSI_ECC 0x64
#define UB953_REG_IND_ACC_CTL 0xb0
#define UB953_REG_IND_ACC_ADDR 0xb1
#define UB953_REG_IND_ACC_DATA 0xb2
#define UB953_REG_FPD3_RX_ID(n) (0xf0 + (n))
#define UB953_REG_FPD3_RX_ID_LEN 6
/* Indirect register blocks */
#define UB953_IND_TARGET_PAT_GEN 0x00
#define UB953_IND_TARGET_FPD3_TX 0x01
#define UB953_IND_TARGET_DIE_ID 0x02
#define UB953_IND_PGEN_CTL 0x01
#define UB953_IND_PGEN_CTL_PGEN_ENABLE BIT(0)
#define UB953_IND_PGEN_CFG 0x02
#define UB953_IND_PGEN_CSI_DI 0x03
#define UB953_IND_PGEN_LINE_SIZE1 0x04
#define UB953_IND_PGEN_LINE_SIZE0 0x05
#define UB953_IND_PGEN_BAR_SIZE1 0x06
#define UB953_IND_PGEN_BAR_SIZE0 0x07
#define UB953_IND_PGEN_ACT_LPF1 0x08
#define UB953_IND_PGEN_ACT_LPF0 0x09
#define UB953_IND_PGEN_TOT_LPF1 0x0a
#define UB953_IND_PGEN_TOT_LPF0 0x0b
#define UB953_IND_PGEN_LINE_PD1 0x0c
#define UB953_IND_PGEN_LINE_PD0 0x0d
#define UB953_IND_PGEN_VBP 0x0e
#define UB953_IND_PGEN_VFP 0x0f
#define UB953_IND_PGEN_COLOR(n) (0x10 + (n)) /* n <= 15 */
/* Note: Only sync mode supported for now */
enum ub953_mode {
/* FPD-Link III CSI-2 synchronous mode */
UB953_MODE_SYNC,
/* FPD-Link III CSI-2 non-synchronous mode, external ref clock */
UB953_MODE_NONSYNC_EXT,
/* FPD-Link III CSI-2 non-synchronous mode, internal ref clock */
UB953_MODE_NONSYNC_INT,
/* FPD-Link III DVP mode */
UB953_MODE_DVP,
};
struct ub953_hw_data {
const char *model;
bool is_ub971;
};
struct ub953_clkout_data {
u32 hs_div;
u32 m;
u32 n;
unsigned long rate;
};
struct ub953_data {
const struct ub953_hw_data *hw_data;
struct i2c_client *client;
struct regmap *regmap;
struct clk *clkin;
u32 num_data_lanes;
bool non_continous_clk;
struct gpio_chip gpio_chip;
struct v4l2_subdev sd;
struct media_pad pads[2];
struct v4l2_async_notifier notifier;
struct v4l2_subdev *source_sd;
u16 source_sd_pad;
u64 enabled_source_streams;
/* lock for register access */
struct mutex reg_lock;
u8 current_indirect_target;
struct clk_hw clkout_clk_hw;
enum ub953_mode mode;
const struct ds90ub9xx_platform_data *plat_data;
};
static inline struct ub953_data *sd_to_ub953(struct v4l2_subdev *sd)
{
return container_of(sd, struct ub953_data, sd);
}
/*
* HW Access
*/
static int ub953_read(struct ub953_data *priv, u8 reg, u8 *val)
{
unsigned int v;
int ret;
mutex_lock(&priv->reg_lock);
ret = regmap_read(priv->regmap, reg, &v);
if (ret) {
dev_err(&priv->client->dev, "Cannot read register 0x%02x: %d\n",
reg, ret);
goto out_unlock;
}
*val = v;
out_unlock:
mutex_unlock(&priv->reg_lock);
return ret;
}
static int ub953_write(struct ub953_data *priv, u8 reg, u8 val)
{
int ret;
mutex_lock(&priv->reg_lock);
ret = regmap_write(priv->regmap, reg, val);
if (ret)
dev_err(&priv->client->dev,
"Cannot write register 0x%02x: %d\n", reg, ret);
mutex_unlock(&priv->reg_lock);
return ret;
}
static int ub953_select_ind_reg_block(struct ub953_data *priv, u8 block)
{
struct device *dev = &priv->client->dev;
int ret;
if (priv->current_indirect_target == block)
return 0;
ret = regmap_write(priv->regmap, UB953_REG_IND_ACC_CTL, block << 2);
if (ret) {
dev_err(dev, "%s: cannot select indirect target %u (%d)\n",
__func__, block, ret);
return ret;
}
priv->current_indirect_target = block;
return 0;
}
__maybe_unused
static int ub953_read_ind(struct ub953_data *priv, u8 block, u8 reg, u8 *val)
{
unsigned int v;
int ret;
mutex_lock(&priv->reg_lock);
ret = ub953_select_ind_reg_block(priv, block);
if (ret)
goto out_unlock;
ret = regmap_write(priv->regmap, UB953_REG_IND_ACC_ADDR, reg);
if (ret) {
dev_err(&priv->client->dev,
"Write to IND_ACC_ADDR failed when reading %u:%x02x: %d\n",
block, reg, ret);
goto out_unlock;
}
ret = regmap_read(priv->regmap, UB953_REG_IND_ACC_DATA, &v);
if (ret) {
dev_err(&priv->client->dev,
"Write to IND_ACC_DATA failed when reading %u:%x02x: %d\n",
block, reg, ret);
goto out_unlock;
}
*val = v;
out_unlock:
mutex_unlock(&priv->reg_lock);
return ret;
}
__maybe_unused
static int ub953_write_ind(struct ub953_data *priv, u8 block, u8 reg, u8 val)
{
int ret;
mutex_lock(&priv->reg_lock);
ret = ub953_select_ind_reg_block(priv, block);
if (ret)
goto out_unlock;
ret = regmap_write(priv->regmap, UB953_REG_IND_ACC_ADDR, reg);
if (ret) {
dev_err(&priv->client->dev,
"Write to IND_ACC_ADDR failed when writing %u:%x02x: %d\n",
block, reg, ret);
goto out_unlock;
}
ret = regmap_write(priv->regmap, UB953_REG_IND_ACC_DATA, val);
if (ret) {
dev_err(&priv->client->dev,
"Write to IND_ACC_DATA failed when writing %u:%x02x\n: %d\n",
block, reg, ret);
}
out_unlock:
mutex_unlock(&priv->reg_lock);
return ret;
}
/*
* GPIO chip
*/
static int ub953_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
{
struct ub953_data *priv = gpiochip_get_data(gc);
int ret;
u8 v;
ret = ub953_read(priv, UB953_REG_GPIO_INPUT_CTRL, &v);
if (ret)
return ret;
if (v & UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(offset))
return GPIO_LINE_DIRECTION_IN;
else
return GPIO_LINE_DIRECTION_OUT;
}
static int ub953_gpio_direction_in(struct gpio_chip *gc, unsigned int offset)
{
struct ub953_data *priv = gpiochip_get_data(gc);
return regmap_update_bits(priv->regmap, UB953_REG_GPIO_INPUT_CTRL,
UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(offset) |
UB953_REG_GPIO_INPUT_CTRL_OUT_EN(offset),
UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(offset));
}
static int ub953_gpio_direction_out(struct gpio_chip *gc, unsigned int offset,
int value)
{
struct ub953_data *priv = gpiochip_get_data(gc);
int ret;
ret = regmap_update_bits(priv->regmap, UB953_REG_LOCAL_GPIO_DATA,
UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset),
value ? UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset) :
0);
if (ret)
return ret;
return regmap_update_bits(priv->regmap, UB953_REG_GPIO_INPUT_CTRL,
UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(offset) |
UB953_REG_GPIO_INPUT_CTRL_OUT_EN(offset),
UB953_REG_GPIO_INPUT_CTRL_OUT_EN(offset));
}
static int ub953_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
struct ub953_data *priv = gpiochip_get_data(gc);
int ret;
u8 v;
ret = ub953_read(priv, UB953_REG_GPIO_PIN_STS, &v);
if (ret)
return ret;
return !!(v & UB953_REG_GPIO_PIN_STS_GPIO_STS(offset));
}
static void ub953_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
{
struct ub953_data *priv = gpiochip_get_data(gc);
regmap_update_bits(priv->regmap, UB953_REG_LOCAL_GPIO_DATA,
UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset),
value ? UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset) :
0);
}
static int ub953_gpio_of_xlate(struct gpio_chip *gc,
const struct of_phandle_args *gpiospec,
u32 *flags)
{
if (flags)
*flags = gpiospec->args[1];
return gpiospec->args[0];
}
static int ub953_gpiochip_probe(struct ub953_data *priv)
{
struct device *dev = &priv->client->dev;
struct gpio_chip *gc = &priv->gpio_chip;
int ret;
/* Set all GPIOs to local input mode */
ub953_write(priv, UB953_REG_LOCAL_GPIO_DATA, 0);
ub953_write(priv, UB953_REG_GPIO_INPUT_CTRL, 0xf);
gc->label = dev_name(dev);
gc->parent = dev;
gc->owner = THIS_MODULE;
gc->base = -1;
gc->can_sleep = true;
gc->ngpio = UB953_NUM_GPIOS;
gc->get_direction = ub953_gpio_get_direction;
gc->direction_input = ub953_gpio_direction_in;
gc->direction_output = ub953_gpio_direction_out;
gc->get = ub953_gpio_get;
gc->set = ub953_gpio_set;
gc->of_xlate = ub953_gpio_of_xlate;
gc->of_gpio_n_cells = 2;
ret = gpiochip_add_data(gc, priv);
if (ret) {
dev_err(dev, "Failed to add GPIOs: %d\n", ret);
return ret;
}
return 0;
}
static void ub953_gpiochip_remove(struct ub953_data *priv)
{
gpiochip_remove(&priv->gpio_chip);
}
/*
* V4L2
*/
static int _ub953_set_routing(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_krouting *routing)
{
static const struct v4l2_mbus_framefmt format = {
.width = 640,
.height = 480,
.code = MEDIA_BUS_FMT_UYVY8_1X16,
.field = V4L2_FIELD_NONE,
.colorspace = V4L2_COLORSPACE_SRGB,
.ycbcr_enc = V4L2_YCBCR_ENC_601,
.quantization = V4L2_QUANTIZATION_LIM_RANGE,
.xfer_func = V4L2_XFER_FUNC_SRGB,
};
int ret;
/*
* Note: we can only support up to V4L2_FRAME_DESC_ENTRY_MAX, until
* frame desc is made dynamically allocated.
*/
if (routing->num_routes > V4L2_FRAME_DESC_ENTRY_MAX)
return -EINVAL;
ret = v4l2_subdev_routing_validate(sd, routing,
V4L2_SUBDEV_ROUTING_ONLY_1_TO_1);
if (ret)
return ret;
ret = v4l2_subdev_set_routing_with_fmt(sd, state, routing, &format);
if (ret)
return ret;
return 0;
}
static int ub953_set_routing(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
enum v4l2_subdev_format_whence which,
struct v4l2_subdev_krouting *routing)
{
struct ub953_data *priv = sd_to_ub953(sd);
if (which == V4L2_SUBDEV_FORMAT_ACTIVE && priv->enabled_source_streams)
return -EBUSY;
return _ub953_set_routing(sd, state, routing);
}
static int ub953_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad,
struct v4l2_mbus_frame_desc *fd)
{
struct ub953_data *priv = sd_to_ub953(sd);
struct v4l2_mbus_frame_desc source_fd;
struct v4l2_subdev_route *route;
struct v4l2_subdev_state *state;
int ret;
if (pad != UB953_PAD_SOURCE)
return -EINVAL;
ret = v4l2_subdev_call(priv->source_sd, pad, get_frame_desc,
priv->source_sd_pad, &source_fd);
if (ret)
return ret;
fd->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2;
state = v4l2_subdev_lock_and_get_active_state(sd);
for_each_active_route(&state->routing, route) {
struct v4l2_mbus_frame_desc_entry *source_entry = NULL;
unsigned int i;
if (route->source_pad != pad)
continue;
for (i = 0; i < source_fd.num_entries; i++) {
if (source_fd.entry[i].stream == route->sink_stream) {
source_entry = &source_fd.entry[i];
break;
}
}
if (!source_entry) {
dev_err(&priv->client->dev,
"Failed to find stream from source frame desc\n");
ret = -EPIPE;
goto out_unlock;
}
fd->entry[fd->num_entries].stream = route->source_stream;
fd->entry[fd->num_entries].flags = source_entry->flags;
fd->entry[fd->num_entries].length = source_entry->length;
fd->entry[fd->num_entries].pixelcode = source_entry->pixelcode;
fd->entry[fd->num_entries].bus.csi2.vc =
source_entry->bus.csi2.vc;
fd->entry[fd->num_entries].bus.csi2.dt =
source_entry->bus.csi2.dt;
fd->num_entries++;
}
out_unlock:
v4l2_subdev_unlock_state(state);
return ret;
}
static int ub953_set_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_format *format)
{
struct ub953_data *priv = sd_to_ub953(sd);
struct v4l2_mbus_framefmt *fmt;
if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE &&
priv->enabled_source_streams)
return -EBUSY;
/* No transcoding, source and sink formats must match. */
if (format->pad == UB953_PAD_SOURCE)
return v4l2_subdev_get_fmt(sd, state, format);
/* Set sink format */
fmt = v4l2_subdev_state_get_format(state, format->pad, format->stream);
if (!fmt)
return -EINVAL;
*fmt = format->format;
/* Propagate to source format */
fmt = v4l2_subdev_state_get_opposite_stream_format(state, format->pad,
format->stream);
if (!fmt)
return -EINVAL;
*fmt = format->format;
return 0;
}
static int ub953_init_state(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state)
{
struct v4l2_subdev_route routes[] = {
{
.sink_pad = UB953_PAD_SINK,
.sink_stream = 0,
.source_pad = UB953_PAD_SOURCE,
.source_stream = 0,
.flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE,
},
};
struct v4l2_subdev_krouting routing = {
.num_routes = ARRAY_SIZE(routes),
.routes = routes,
};
return _ub953_set_routing(sd, state, &routing);
}
static int ub953_log_status(struct v4l2_subdev *sd)
{
struct ub953_data *priv = sd_to_ub953(sd);
struct device *dev = &priv->client->dev;
u8 v = 0, v1 = 0, v2 = 0;
unsigned int i;
char id[UB953_REG_FPD3_RX_ID_LEN];
u8 gpio_local_data = 0;
u8 gpio_input_ctrl = 0;
u8 gpio_pin_sts = 0;
for (i = 0; i < sizeof(id); i++)
ub953_read(priv, UB953_REG_FPD3_RX_ID(i), &id[i]);
dev_info(dev, "ID '%.*s'\n", (int)sizeof(id), id);
ub953_read(priv, UB953_REG_GENERAL_STATUS, &v);
dev_info(dev, "GENERAL_STATUS %#02x\n", v);
ub953_read(priv, UB953_REG_CRC_ERR_CNT1, &v1);
ub953_read(priv, UB953_REG_CRC_ERR_CNT2, &v2);
dev_info(dev, "CRC error count %u\n", v1 | (v2 << 8));
ub953_read(priv, UB953_REG_CSI_ERR_CNT, &v);
dev_info(dev, "CSI error count %u\n", v);
ub953_read(priv, UB953_REG_CSI_ERR_STATUS, &v);
dev_info(dev, "CSI_ERR_STATUS %#02x\n", v);
ub953_read(priv, UB953_REG_CSI_ERR_DLANE01, &v);
dev_info(dev, "CSI_ERR_DLANE01 %#02x\n", v);
ub953_read(priv, UB953_REG_CSI_ERR_DLANE23, &v);
dev_info(dev, "CSI_ERR_DLANE23 %#02x\n", v);
ub953_read(priv, UB953_REG_CSI_ERR_CLK_LANE, &v);
dev_info(dev, "CSI_ERR_CLK_LANE %#02x\n", v);
ub953_read(priv, UB953_REG_CSI_PKT_HDR_VC_ID, &v);
dev_info(dev, "CSI packet header VC %u ID %u\n", v >> 6, v & 0x3f);
ub953_read(priv, UB953_REG_PKT_HDR_WC_LSB, &v1);
ub953_read(priv, UB953_REG_PKT_HDR_WC_MSB, &v2);
dev_info(dev, "CSI packet header WC %u\n", (v2 << 8) | v1);
ub953_read(priv, UB953_REG_CSI_ECC, &v);
dev_info(dev, "CSI ECC %#02x\n", v);
ub953_read(priv, UB953_REG_LOCAL_GPIO_DATA, &gpio_local_data);
ub953_read(priv, UB953_REG_GPIO_INPUT_CTRL, &gpio_input_ctrl);
ub953_read(priv, UB953_REG_GPIO_PIN_STS, &gpio_pin_sts);
for (i = 0; i < UB953_NUM_GPIOS; i++) {
dev_info(dev,
"GPIO%u: remote: %u is_input: %u is_output: %u val: %u sts: %u\n",
i,
!!(gpio_local_data & UB953_REG_LOCAL_GPIO_DATA_GPIO_RMTEN(i)),
!!(gpio_input_ctrl & UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(i)),
!!(gpio_input_ctrl & UB953_REG_GPIO_INPUT_CTRL_OUT_EN(i)),
!!(gpio_local_data & UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(i)),
!!(gpio_pin_sts & UB953_REG_GPIO_PIN_STS_GPIO_STS(i)));
}
return 0;
}
static int ub953_enable_streams(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state, u32 pad,
u64 streams_mask)
{
struct ub953_data *priv = sd_to_ub953(sd);
u64 sink_streams;
int ret;
sink_streams = v4l2_subdev_state_xlate_streams(state, UB953_PAD_SOURCE,
UB953_PAD_SINK,
&streams_mask);
ret = v4l2_subdev_enable_streams(priv->source_sd, priv->source_sd_pad,
sink_streams);
if (ret)
return ret;
priv->enabled_source_streams |= streams_mask;
return 0;
}
static int ub953_disable_streams(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state, u32 pad,
u64 streams_mask)
{
struct ub953_data *priv = sd_to_ub953(sd);
u64 sink_streams;
int ret;
sink_streams = v4l2_subdev_state_xlate_streams(state, UB953_PAD_SOURCE,
UB953_PAD_SINK,
&streams_mask);
ret = v4l2_subdev_disable_streams(priv->source_sd, priv->source_sd_pad,
sink_streams);
if (ret)
return ret;
priv->enabled_source_streams &= ~streams_mask;
return 0;
}
static const struct v4l2_subdev_pad_ops ub953_pad_ops = {
.enable_streams = ub953_enable_streams,
.disable_streams = ub953_disable_streams,
.set_routing = ub953_set_routing,
.get_frame_desc = ub953_get_frame_desc,
.get_fmt = v4l2_subdev_get_fmt,
.set_fmt = ub953_set_fmt,
};
static const struct v4l2_subdev_core_ops ub953_subdev_core_ops = {
.log_status = ub953_log_status,
.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
.unsubscribe_event = v4l2_event_subdev_unsubscribe,
};
static const struct v4l2_subdev_ops ub953_subdev_ops = {
.core = &ub953_subdev_core_ops,
.pad = &ub953_pad_ops,
};
static const struct v4l2_subdev_internal_ops ub953_internal_ops = {
.init_state = ub953_init_state,
};
static const struct media_entity_operations ub953_entity_ops = {
.link_validate = v4l2_subdev_link_validate,
};
static int ub953_notify_bound(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *source_subdev,
struct v4l2_async_connection *asd)
{
struct ub953_data *priv = sd_to_ub953(notifier->sd);
struct device *dev = &priv->client->dev;
int ret;
ret = media_entity_get_fwnode_pad(&source_subdev->entity,
source_subdev->fwnode,
MEDIA_PAD_FL_SOURCE);
if (ret < 0) {
dev_err(dev, "Failed to find pad for %s\n",
source_subdev->name);
return ret;
}
priv->source_sd = source_subdev;
priv->source_sd_pad = ret;
ret = media_create_pad_link(&source_subdev->entity, priv->source_sd_pad,
&priv->sd.entity, 0,
MEDIA_LNK_FL_ENABLED |
MEDIA_LNK_FL_IMMUTABLE);
if (ret) {
dev_err(dev, "Unable to link %s:%u -> %s:0\n",
source_subdev->name, priv->source_sd_pad,
priv->sd.name);
return ret;
}
return 0;
}
static const struct v4l2_async_notifier_operations ub953_notify_ops = {
.bound = ub953_notify_bound,
};
static int ub953_v4l2_notifier_register(struct ub953_data *priv)
{
struct device *dev = &priv->client->dev;
struct v4l2_async_connection *asd;
struct fwnode_handle *ep_fwnode;
int ret;
ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
UB953_PAD_SINK, 0, 0);
if (!ep_fwnode) {
dev_err(dev, "No graph endpoint\n");
return -ENODEV;
}
v4l2_async_subdev_nf_init(&priv->notifier, &priv->sd);
asd = v4l2_async_nf_add_fwnode_remote(&priv->notifier, ep_fwnode,
struct v4l2_async_connection);
fwnode_handle_put(ep_fwnode);
if (IS_ERR(asd)) {
dev_err(dev, "Failed to add subdev: %ld", PTR_ERR(asd));
v4l2_async_nf_cleanup(&priv->notifier);
return PTR_ERR(asd);
}
priv->notifier.ops = &ub953_notify_ops;
ret = v4l2_async_nf_register(&priv->notifier);
if (ret) {
dev_err(dev, "Failed to register subdev_notifier");
v4l2_async_nf_cleanup(&priv->notifier);
return ret;
}
return 0;
}
static void ub953_v4l2_notifier_unregister(struct ub953_data *priv)
{
v4l2_async_nf_unregister(&priv->notifier);
v4l2_async_nf_cleanup(&priv->notifier);
}
/*
* Probing
*/
static int ub953_i2c_master_init(struct ub953_data *priv)
{
/* i2c fast mode */
u32 ref = 26250000;
u32 scl_high = 915; /* ns */
u32 scl_low = 1641; /* ns */
int ret;
scl_high = div64_u64((u64)scl_high * ref, 1000000000) - 5;
scl_low = div64_u64((u64)scl_low * ref, 1000000000) - 5;
ret = ub953_write(priv, UB953_REG_SCL_HIGH_TIME, scl_high);
if (ret)
return ret;
ret = ub953_write(priv, UB953_REG_SCL_LOW_TIME, scl_low);
if (ret)
return ret;
return 0;
}
static u64 ub953_get_fc_rate(struct ub953_data *priv)
{
switch (priv->mode) {
case UB953_MODE_SYNC:
if (priv->hw_data->is_ub971)
return priv->plat_data->bc_rate * 160ull;
else
return priv->plat_data->bc_rate / 2 * 160ull;
case UB953_MODE_NONSYNC_EXT:
/* CLKIN_DIV = 1 always */
return clk_get_rate(priv->clkin) * 80ull;
default:
/* Not supported */
return 0;
}
}
static unsigned long ub953_calc_clkout_ub953(struct ub953_data *priv,
unsigned long target, u64 fc,
u8 *hs_div, u8 *m, u8 *n)
{
/*
* We always use 4 as a pre-divider (HS_CLK_DIV = 2).
*
* According to the datasheet:
* - "HS_CLK_DIV typically should be set to either 16, 8, or 4 (default)."
* - "if it is not possible to have an integer ratio of N/M, it is best to
* select a smaller value for HS_CLK_DIV.
*
* For above reasons the default HS_CLK_DIV seems the best in the average
* case. Use always that value to keep the code simple.
*/
static const unsigned long hs_clk_div = 4;
u64 fc_divided;
unsigned long mul, div;
unsigned long res;
/* clkout = fc / hs_clk_div * m / n */
fc_divided = div_u64(fc, hs_clk_div);
rational_best_approximation(target, fc_divided, (1 << 5) - 1,
(1 << 8) - 1, &mul, &div);
res = div_u64(fc_divided * mul, div);
*hs_div = hs_clk_div;
*m = mul;
*n = div;
return res;
}
static unsigned long ub953_calc_clkout_ub971(struct ub953_data *priv,
unsigned long target, u64 fc,
u8 *m, u8 *n)
{
u64 fc_divided;
unsigned long mul, div;
unsigned long res;
/* clkout = fc * m / (8 * n) */
fc_divided = div_u64(fc, 8);
rational_best_approximation(target, fc_divided, (1 << 5) - 1,
(1 << 8) - 1, &mul, &div);
res = div_u64(fc_divided * mul, div);
*m = mul;
*n = div;
return res;
}
static void ub953_calc_clkout_params(struct ub953_data *priv,
unsigned long target_rate,
struct ub953_clkout_data *clkout_data)
{
struct device *dev = &priv->client->dev;
unsigned long clkout_rate;
u64 fc_rate;
fc_rate = ub953_get_fc_rate(priv);
if (priv->hw_data->is_ub971) {
u8 m, n;
clkout_rate = ub953_calc_clkout_ub971(priv, target_rate,
fc_rate, &m, &n);
clkout_data->m = m;
clkout_data->n = n;
dev_dbg(dev, "%s %llu * %u / (8 * %u) = %lu (requested %lu)",
__func__, fc_rate, m, n, clkout_rate, target_rate);
} else {
u8 hs_div, m, n;
clkout_rate = ub953_calc_clkout_ub953(priv, target_rate,
fc_rate, &hs_div, &m, &n);
clkout_data->hs_div = hs_div;
clkout_data->m = m;
clkout_data->n = n;
dev_dbg(dev, "%s %llu / %u * %u / %u = %lu (requested %lu)",
__func__, fc_rate, hs_div, m, n, clkout_rate,
target_rate);
}
clkout_data->rate = clkout_rate;
}
static void ub953_write_clkout_regs(struct ub953_data *priv,
const struct ub953_clkout_data *clkout_data)
{
u8 clkout_ctrl0, clkout_ctrl1;
if (priv->hw_data->is_ub971)
clkout_ctrl0 = clkout_data->m;
else
clkout_ctrl0 = (__ffs(clkout_data->hs_div) << 5) |
clkout_data->m;
clkout_ctrl1 = clkout_data->n;
ub953_write(priv, UB953_REG_CLKOUT_CTRL0, clkout_ctrl0);
ub953_write(priv, UB953_REG_CLKOUT_CTRL1, clkout_ctrl1);
}
static unsigned long ub953_clkout_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct ub953_data *priv = container_of(hw, struct ub953_data, clkout_clk_hw);
struct device *dev = &priv->client->dev;
u8 ctrl0, ctrl1;
u32 mul, div;
u64 fc_rate;
u32 hs_clk_div;
u64 rate;
int ret;
ret = ub953_read(priv, UB953_REG_CLKOUT_CTRL0, &ctrl0);
if (ret) {
dev_err(dev, "Failed to read CLKOUT_CTRL0: %d\n", ret);
return 0;
}
ret = ub953_read(priv, UB953_REG_CLKOUT_CTRL1, &ctrl1);
if (ret) {
dev_err(dev, "Failed to read CLKOUT_CTRL1: %d\n", ret);
return 0;
}
fc_rate = ub953_get_fc_rate(priv);
if (priv->hw_data->is_ub971) {
mul = ctrl0 & 0x1f;
div = ctrl1;
if (div == 0)
return 0;
rate = div_u64(fc_rate * mul, 8 * div);
dev_dbg(dev, "clkout: fc rate %llu, mul %u, div %u = %llu\n",
fc_rate, mul, div, rate);
} else {
mul = ctrl0 & 0x1f;
hs_clk_div = 1 << (ctrl0 >> 5);
div = ctrl1;
if (div == 0)
return 0;
rate = div_u64(div_u64(fc_rate, hs_clk_div) * mul, div);
dev_dbg(dev,
"clkout: fc rate %llu, hs_clk_div %u, mul %u, div %u = %llu\n",
fc_rate, hs_clk_div, mul, div, rate);
}
return rate;
}
static long ub953_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *parent_rate)
{
struct ub953_data *priv = container_of(hw, struct ub953_data, clkout_clk_hw);
struct ub953_clkout_data clkout_data;
ub953_calc_clkout_params(priv, rate, &clkout_data);
return clkout_data.rate;
}
static int ub953_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct ub953_data *priv = container_of(hw, struct ub953_data, clkout_clk_hw);
struct ub953_clkout_data clkout_data;
ub953_calc_clkout_params(priv, rate, &clkout_data);
dev_dbg(&priv->client->dev, "%s %lu (requested %lu)\n", __func__,
clkout_data.rate, rate);
ub953_write_clkout_regs(priv, &clkout_data);
return 0;
}
static const struct clk_ops ub953_clkout_ops = {
.recalc_rate = ub953_clkout_recalc_rate,
.round_rate = ub953_clkout_round_rate,
.set_rate = ub953_clkout_set_rate,
};
static int ub953_register_clkout(struct ub953_data *priv)
{
struct device *dev = &priv->client->dev;
const struct clk_init_data init = {
.name = kasprintf(GFP_KERNEL, "ds90%s.%s.clk_out",
priv->hw_data->model, dev_name(dev)),
.ops = &ub953_clkout_ops,
};
struct ub953_clkout_data clkout_data;
int ret;
if (!init.name)
return -ENOMEM;
/* Initialize clkout to 25MHz by default */
ub953_calc_clkout_params(priv, UB953_DEFAULT_CLKOUT_RATE, &clkout_data);
ub953_write_clkout_regs(priv, &clkout_data);
priv->clkout_clk_hw.init = &init;
ret = devm_clk_hw_register(dev, &priv->clkout_clk_hw);
kfree(init.name);
if (ret)
return dev_err_probe(dev, ret, "Cannot register clock HW\n");
ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
&priv->clkout_clk_hw);
if (ret)
return dev_err_probe(dev, ret,
"Cannot add OF clock provider\n");
return 0;
}
static int ub953_add_i2c_adapter(struct ub953_data *priv)
{
struct device *dev = &priv->client->dev;
struct fwnode_handle *i2c_handle;
int ret;
i2c_handle = device_get_named_child_node(dev, "i2c");
if (!i2c_handle)
return 0;
ret = i2c_atr_add_adapter(priv->plat_data->atr, priv->plat_data->port,
dev, i2c_handle);
fwnode_handle_put(i2c_handle);
if (ret)
return ret;
return 0;
}
static const struct regmap_config ub953_regmap_config = {
.name = "ds90ub953",
.reg_bits = 8,
.val_bits = 8,
.reg_format_endian = REGMAP_ENDIAN_DEFAULT,
.val_format_endian = REGMAP_ENDIAN_DEFAULT,
};
static int ub953_parse_dt(struct ub953_data *priv)
{
struct device *dev = &priv->client->dev;
struct v4l2_fwnode_endpoint vep = {
.bus_type = V4L2_MBUS_CSI2_DPHY,
};
struct fwnode_handle *ep_fwnode;
unsigned char nlanes;
int ret;
ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
UB953_PAD_SINK, 0, 0);
if (!ep_fwnode)
return dev_err_probe(dev, -ENOENT, "no endpoint found\n");
ret = v4l2_fwnode_endpoint_parse(ep_fwnode, &vep);
fwnode_handle_put(ep_fwnode);
if (ret)
return dev_err_probe(dev, ret,
"failed to parse sink endpoint data\n");
nlanes = vep.bus.mipi_csi2.num_data_lanes;
if (nlanes != 1 && nlanes != 2 && nlanes != 4)
return dev_err_probe(dev, -EINVAL,
"bad number of data-lanes: %u\n", nlanes);
priv->num_data_lanes = nlanes;
priv->non_continous_clk = vep.bus.mipi_csi2.flags &
V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
return 0;
}
static int ub953_hw_init(struct ub953_data *priv)
{
struct device *dev = &priv->client->dev;
bool mode_override;
int ret;
u8 v;
ret = ub953_read(priv, UB953_REG_MODE_SEL, &v);
if (ret)
return ret;
if (!(v & UB953_REG_MODE_SEL_MODE_DONE))
return dev_err_probe(dev, -EIO, "Mode value not stabilized\n");
mode_override = v & UB953_REG_MODE_SEL_MODE_OVERRIDE;
switch (v & UB953_REG_MODE_SEL_MODE_MASK) {
case 0:
priv->mode = UB953_MODE_SYNC;
break;
case 2:
priv->mode = UB953_MODE_NONSYNC_EXT;
break;
case 3:
priv->mode = UB953_MODE_NONSYNC_INT;
break;
case 5:
priv->mode = UB953_MODE_DVP;
break;
default:
return dev_err_probe(dev, -EIO,
"Invalid mode in mode register\n");
}
dev_dbg(dev, "mode from %s: %#x\n", mode_override ? "reg" : "strap",
priv->mode);
if (priv->mode != UB953_MODE_SYNC &&
priv->mode != UB953_MODE_NONSYNC_EXT)
return dev_err_probe(dev, -ENODEV,
"Unsupported mode selected: %u\n",
priv->mode);
if (priv->mode == UB953_MODE_NONSYNC_EXT && !priv->clkin)
return dev_err_probe(dev, -EINVAL,
"clkin required for non-sync ext mode\n");
ret = ub953_read(priv, UB953_REG_REV_MASK_ID, &v);
if (ret)
return dev_err_probe(dev, ret, "Failed to read revision");
dev_info(dev, "Found %s rev/mask %#04x\n", priv->hw_data->model, v);
ret = ub953_read(priv, UB953_REG_GENERAL_CFG, &v);
if (ret)
return ret;
dev_dbg(dev, "i2c strap setting %s V\n",
(v & UB953_REG_GENERAL_CFG_I2C_STRAP_MODE) ? "1.8" : "3.3");
ret = ub953_i2c_master_init(priv);
if (ret)
return dev_err_probe(dev, ret, "i2c init failed\n");
ub953_write(priv, UB953_REG_GENERAL_CFG,
(priv->non_continous_clk ? 0 : UB953_REG_GENERAL_CFG_CONT_CLK) |
((priv->num_data_lanes - 1) << UB953_REG_GENERAL_CFG_CSI_LANE_SEL_SHIFT) |
UB953_REG_GENERAL_CFG_CRC_TX_GEN_ENABLE);
return 0;
}
static int ub953_subdev_init(struct ub953_data *priv)
{
struct device *dev = &priv->client->dev;
int ret;
v4l2_i2c_subdev_init(&priv->sd, priv->client, &ub953_subdev_ops);
priv->sd.internal_ops = &ub953_internal_ops;
priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
V4L2_SUBDEV_FL_HAS_EVENTS | V4L2_SUBDEV_FL_STREAMS;
priv->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
priv->sd.entity.ops = &ub953_entity_ops;
priv->pads[0].flags = MEDIA_PAD_FL_SINK;
priv->pads[1].flags = MEDIA_PAD_FL_SOURCE;
ret = media_entity_pads_init(&priv->sd.entity, 2, priv->pads);
if (ret)
return dev_err_probe(dev, ret, "Failed to init pads\n");
ret = v4l2_subdev_init_finalize(&priv->sd);
if (ret)
goto err_entity_cleanup;
ret = ub953_v4l2_notifier_register(priv);
if (ret) {
dev_err_probe(dev, ret,
"v4l2 subdev notifier register failed\n");
goto err_free_state;
}
ret = v4l2_async_register_subdev(&priv->sd);
if (ret) {
dev_err_probe(dev, ret, "v4l2_async_register_subdev error\n");
goto err_unreg_notif;
}
return 0;
err_unreg_notif:
ub953_v4l2_notifier_unregister(priv);
err_free_state:
v4l2_subdev_cleanup(&priv->sd);
err_entity_cleanup:
media_entity_cleanup(&priv->sd.entity);
return ret;
}
static void ub953_subdev_uninit(struct ub953_data *priv)
{
v4l2_async_unregister_subdev(&priv->sd);
ub953_v4l2_notifier_unregister(priv);
v4l2_subdev_cleanup(&priv->sd);
fwnode_handle_put(priv->sd.fwnode);
media_entity_cleanup(&priv->sd.entity);
}
static int ub953_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct ub953_data *priv;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->client = client;
priv->hw_data = device_get_match_data(dev);
priv->plat_data = dev_get_platdata(&client->dev);
if (!priv->plat_data)
return dev_err_probe(dev, -ENODEV, "Platform data missing\n");
mutex_init(&priv->reg_lock);
/*
* Initialize to invalid values so that the first reg writes will
* configure the target.
*/
priv->current_indirect_target = 0xff;
priv->regmap = devm_regmap_init_i2c(client, &ub953_regmap_config);
if (IS_ERR(priv->regmap)) {
ret = PTR_ERR(priv->regmap);
dev_err_probe(dev, ret, "Failed to init regmap\n");
goto err_mutex_destroy;
}
priv->clkin = devm_clk_get_optional(dev, "clkin");
if (IS_ERR(priv->clkin)) {
ret = PTR_ERR(priv->clkin);
dev_err_probe(dev, ret, "failed to parse 'clkin'\n");
goto err_mutex_destroy;
}
ret = ub953_parse_dt(priv);
if (ret)
goto err_mutex_destroy;
ret = ub953_hw_init(priv);
if (ret)
goto err_mutex_destroy;
ret = ub953_gpiochip_probe(priv);
if (ret) {
dev_err_probe(dev, ret, "Failed to init gpiochip\n");
goto err_mutex_destroy;
}
ret = ub953_register_clkout(priv);
if (ret) {
dev_err_probe(dev, ret, "Failed to register clkout\n");
goto err_gpiochip_remove;
}
ret = ub953_subdev_init(priv);
if (ret)
goto err_gpiochip_remove;
ret = ub953_add_i2c_adapter(priv);
if (ret) {
dev_err_probe(dev, ret, "failed to add remote i2c adapter\n");
goto err_subdev_uninit;
}
return 0;
err_subdev_uninit:
ub953_subdev_uninit(priv);
err_gpiochip_remove:
ub953_gpiochip_remove(priv);
err_mutex_destroy:
mutex_destroy(&priv->reg_lock);
return ret;
}
static void ub953_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
struct ub953_data *priv = sd_to_ub953(sd);
i2c_atr_del_adapter(priv->plat_data->atr, priv->plat_data->port);
ub953_subdev_uninit(priv);
ub953_gpiochip_remove(priv);
mutex_destroy(&priv->reg_lock);
}
static const struct ub953_hw_data ds90ub953_hw = {
.model = "ub953",
};
static const struct ub953_hw_data ds90ub971_hw = {
.model = "ub971",
.is_ub971 = true,
};
static const struct i2c_device_id ub953_id[] = {
{ "ds90ub953-q1", (kernel_ulong_t)&ds90ub953_hw },
{ "ds90ub971-q1", (kernel_ulong_t)&ds90ub971_hw },
{}
};
MODULE_DEVICE_TABLE(i2c, ub953_id);
static const struct of_device_id ub953_dt_ids[] = {
{ .compatible = "ti,ds90ub953-q1", .data = &ds90ub953_hw },
{ .compatible = "ti,ds90ub971-q1", .data = &ds90ub971_hw },
{}
};
MODULE_DEVICE_TABLE(of, ub953_dt_ids);
static struct i2c_driver ds90ub953_driver = {
.probe = ub953_probe,
.remove = ub953_remove,
.id_table = ub953_id,
.driver = {
.name = "ds90ub953",
.of_match_table = ub953_dt_ids,
},
};
module_i2c_driver(ds90ub953_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Texas Instruments FPD-Link III/IV CSI-2 Serializers Driver");
MODULE_AUTHOR("Luca Ceresoli <luca@lucaceresoli.net>");
MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>");
MODULE_IMPORT_NS(I2C_ATR);
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