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linux/linux-5.18.11/drivers/media/platform/xilinx/xilinx-csi2rxss.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Driver for Xilinx MIPI CSI-2 Rx Subsystem
*
* Copyright (C) 2016 - 2020 Xilinx, Inc.
*
* Contacts: Vishal Sagar <vishal.sagar@xilinx.com>
*
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/v4l2-subdev.h>
#include <media/media-entity.h>
#include <media/mipi-csi2.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-subdev.h>
#include "xilinx-vip.h"
/* Register register map */
#define XCSI_CCR_OFFSET 0x00
#define XCSI_CCR_SOFTRESET BIT(1)
#define XCSI_CCR_ENABLE BIT(0)
#define XCSI_PCR_OFFSET 0x04
#define XCSI_PCR_MAXLANES_MASK GENMASK(4, 3)
#define XCSI_PCR_ACTLANES_MASK GENMASK(1, 0)
#define XCSI_CSR_OFFSET 0x10
#define XCSI_CSR_PKTCNT GENMASK(31, 16)
#define XCSI_CSR_SPFIFOFULL BIT(3)
#define XCSI_CSR_SPFIFONE BIT(2)
#define XCSI_CSR_SLBF BIT(1)
#define XCSI_CSR_RIPCD BIT(0)
#define XCSI_GIER_OFFSET 0x20
#define XCSI_GIER_GIE BIT(0)
#define XCSI_ISR_OFFSET 0x24
#define XCSI_IER_OFFSET 0x28
#define XCSI_ISR_FR BIT(31)
#define XCSI_ISR_VCXFE BIT(30)
#define XCSI_ISR_WCC BIT(22)
#define XCSI_ISR_ILC BIT(21)
#define XCSI_ISR_SPFIFOF BIT(20)
#define XCSI_ISR_SPFIFONE BIT(19)
#define XCSI_ISR_SLBF BIT(18)
#define XCSI_ISR_STOP BIT(17)
#define XCSI_ISR_SOTERR BIT(13)
#define XCSI_ISR_SOTSYNCERR BIT(12)
#define XCSI_ISR_ECC2BERR BIT(11)
#define XCSI_ISR_ECC1BERR BIT(10)
#define XCSI_ISR_CRCERR BIT(9)
#define XCSI_ISR_DATAIDERR BIT(8)
#define XCSI_ISR_VC3FSYNCERR BIT(7)
#define XCSI_ISR_VC3FLVLERR BIT(6)
#define XCSI_ISR_VC2FSYNCERR BIT(5)
#define XCSI_ISR_VC2FLVLERR BIT(4)
#define XCSI_ISR_VC1FSYNCERR BIT(3)
#define XCSI_ISR_VC1FLVLERR BIT(2)
#define XCSI_ISR_VC0FSYNCERR BIT(1)
#define XCSI_ISR_VC0FLVLERR BIT(0)
#define XCSI_ISR_ALLINTR_MASK (0xc07e3fff)
/*
* Removed VCXFE mask as it doesn't exist in IER
* Removed STOP state irq as this will keep driver in irq handler only
*/
#define XCSI_IER_INTR_MASK (XCSI_ISR_ALLINTR_MASK &\
~(XCSI_ISR_STOP | XCSI_ISR_VCXFE))
#define XCSI_SPKTR_OFFSET 0x30
#define XCSI_SPKTR_DATA GENMASK(23, 8)
#define XCSI_SPKTR_VC GENMASK(7, 6)
#define XCSI_SPKTR_DT GENMASK(5, 0)
#define XCSI_SPKT_FIFO_DEPTH 31
#define XCSI_VCXR_OFFSET 0x34
#define XCSI_VCXR_VCERR GENMASK(23, 0)
#define XCSI_VCXR_FSYNCERR BIT(1)
#define XCSI_VCXR_FLVLERR BIT(0)
#define XCSI_CLKINFR_OFFSET 0x3C
#define XCSI_CLKINFR_STOP BIT(1)
#define XCSI_DLXINFR_OFFSET 0x40
#define XCSI_DLXINFR_STOP BIT(5)
#define XCSI_DLXINFR_SOTERR BIT(1)
#define XCSI_DLXINFR_SOTSYNCERR BIT(0)
#define XCSI_MAXDL_COUNT 0x4
#define XCSI_VCXINF1R_OFFSET 0x60
#define XCSI_VCXINF1R_LINECOUNT GENMASK(31, 16)
#define XCSI_VCXINF1R_LINECOUNT_SHIFT 16
#define XCSI_VCXINF1R_BYTECOUNT GENMASK(15, 0)
#define XCSI_VCXINF2R_OFFSET 0x64
#define XCSI_VCXINF2R_DT GENMASK(5, 0)
#define XCSI_MAXVCX_COUNT 16
/*
* Sink pad connected to sensor source pad.
* Source pad connected to next module like demosaic.
*/
#define XCSI_MEDIA_PADS 2
#define XCSI_DEFAULT_WIDTH 1920
#define XCSI_DEFAULT_HEIGHT 1080
#define XCSI_VCX_START 4
#define XCSI_MAX_VC 4
#define XCSI_MAX_VCX 16
#define XCSI_NEXTREG_OFFSET 4
/* There are 2 events frame sync and frame level error per VC */
#define XCSI_VCX_NUM_EVENTS ((XCSI_MAX_VCX - XCSI_MAX_VC) * 2)
/**
* struct xcsi2rxss_event - Event log structure
* @mask: Event mask
* @name: Name of the event
*/
struct xcsi2rxss_event {
u32 mask;
const char *name;
};
static const struct xcsi2rxss_event xcsi2rxss_events[] = {
{ XCSI_ISR_FR, "Frame Received" },
{ XCSI_ISR_VCXFE, "VCX Frame Errors" },
{ XCSI_ISR_WCC, "Word Count Errors" },
{ XCSI_ISR_ILC, "Invalid Lane Count Error" },
{ XCSI_ISR_SPFIFOF, "Short Packet FIFO OverFlow Error" },
{ XCSI_ISR_SPFIFONE, "Short Packet FIFO Not Empty" },
{ XCSI_ISR_SLBF, "Streamline Buffer Full Error" },
{ XCSI_ISR_STOP, "Lane Stop State" },
{ XCSI_ISR_SOTERR, "SOT Error" },
{ XCSI_ISR_SOTSYNCERR, "SOT Sync Error" },
{ XCSI_ISR_ECC2BERR, "2 Bit ECC Unrecoverable Error" },
{ XCSI_ISR_ECC1BERR, "1 Bit ECC Recoverable Error" },
{ XCSI_ISR_CRCERR, "CRC Error" },
{ XCSI_ISR_DATAIDERR, "Data Id Error" },
{ XCSI_ISR_VC3FSYNCERR, "Virtual Channel 3 Frame Sync Error" },
{ XCSI_ISR_VC3FLVLERR, "Virtual Channel 3 Frame Level Error" },
{ XCSI_ISR_VC2FSYNCERR, "Virtual Channel 2 Frame Sync Error" },
{ XCSI_ISR_VC2FLVLERR, "Virtual Channel 2 Frame Level Error" },
{ XCSI_ISR_VC1FSYNCERR, "Virtual Channel 1 Frame Sync Error" },
{ XCSI_ISR_VC1FLVLERR, "Virtual Channel 1 Frame Level Error" },
{ XCSI_ISR_VC0FSYNCERR, "Virtual Channel 0 Frame Sync Error" },
{ XCSI_ISR_VC0FLVLERR, "Virtual Channel 0 Frame Level Error" }
};
#define XCSI_NUM_EVENTS ARRAY_SIZE(xcsi2rxss_events)
/*
* This table provides a mapping between CSI-2 Data type
* and media bus formats
*/
static const u32 xcsi2dt_mbus_lut[][2] = {
{ MIPI_CSI2_DT_YUV422_8B, MEDIA_BUS_FMT_UYVY8_1X16 },
{ MIPI_CSI2_DT_YUV422_10B, MEDIA_BUS_FMT_UYVY10_1X20 },
{ MIPI_CSI2_DT_RGB444, 0 },
{ MIPI_CSI2_DT_RGB555, 0 },
{ MIPI_CSI2_DT_RGB565, 0 },
{ MIPI_CSI2_DT_RGB666, 0 },
{ MIPI_CSI2_DT_RGB888, MEDIA_BUS_FMT_RBG888_1X24 },
{ MIPI_CSI2_DT_RAW6, 0 },
{ MIPI_CSI2_DT_RAW7, 0 },
{ MIPI_CSI2_DT_RAW8, MEDIA_BUS_FMT_SRGGB8_1X8 },
{ MIPI_CSI2_DT_RAW8, MEDIA_BUS_FMT_SBGGR8_1X8 },
{ MIPI_CSI2_DT_RAW8, MEDIA_BUS_FMT_SGBRG8_1X8 },
{ MIPI_CSI2_DT_RAW8, MEDIA_BUS_FMT_SGRBG8_1X8 },
{ MIPI_CSI2_DT_RAW10, MEDIA_BUS_FMT_SRGGB10_1X10 },
{ MIPI_CSI2_DT_RAW10, MEDIA_BUS_FMT_SBGGR10_1X10 },
{ MIPI_CSI2_DT_RAW10, MEDIA_BUS_FMT_SGBRG10_1X10 },
{ MIPI_CSI2_DT_RAW10, MEDIA_BUS_FMT_SGRBG10_1X10 },
{ MIPI_CSI2_DT_RAW12, MEDIA_BUS_FMT_SRGGB12_1X12 },
{ MIPI_CSI2_DT_RAW12, MEDIA_BUS_FMT_SBGGR12_1X12 },
{ MIPI_CSI2_DT_RAW12, MEDIA_BUS_FMT_SGBRG12_1X12 },
{ MIPI_CSI2_DT_RAW12, MEDIA_BUS_FMT_SGRBG12_1X12 },
{ MIPI_CSI2_DT_RAW16, MEDIA_BUS_FMT_SRGGB16_1X16 },
{ MIPI_CSI2_DT_RAW16, MEDIA_BUS_FMT_SBGGR16_1X16 },
{ MIPI_CSI2_DT_RAW16, MEDIA_BUS_FMT_SGBRG16_1X16 },
{ MIPI_CSI2_DT_RAW16, MEDIA_BUS_FMT_SGRBG16_1X16 },
{ MIPI_CSI2_DT_RAW20, 0 },
};
/**
* struct xcsi2rxss_state - CSI-2 Rx Subsystem device structure
* @subdev: The v4l2 subdev structure
* @format: Active V4L2 formats on each pad
* @default_format: Default V4L2 format
* @events: counter for events
* @vcx_events: counter for vcx_events
* @dev: Platform structure
* @rsubdev: Remote subdev connected to sink pad
* @rst_gpio: reset to video_aresetn
* @clks: array of clocks
* @iomem: Base address of subsystem
* @max_num_lanes: Maximum number of lanes present
* @datatype: Data type filter
* @lock: mutex for accessing this structure
* @pads: media pads
* @streaming: Flag for storing streaming state
* @enable_active_lanes: If number of active lanes can be modified
* @en_vcx: If more than 4 VC are enabled
*
* This structure contains the device driver related parameters
*/
struct xcsi2rxss_state {
struct v4l2_subdev subdev;
struct v4l2_mbus_framefmt format;
struct v4l2_mbus_framefmt default_format;
u32 events[XCSI_NUM_EVENTS];
u32 vcx_events[XCSI_VCX_NUM_EVENTS];
struct device *dev;
struct v4l2_subdev *rsubdev;
struct gpio_desc *rst_gpio;
struct clk_bulk_data *clks;
void __iomem *iomem;
u32 max_num_lanes;
u32 datatype;
/* used to protect access to this struct */
struct mutex lock;
struct media_pad pads[XCSI_MEDIA_PADS];
bool streaming;
bool enable_active_lanes;
bool en_vcx;
};
static const struct clk_bulk_data xcsi2rxss_clks[] = {
{ .id = "lite_aclk" },
{ .id = "video_aclk" },
};
static inline struct xcsi2rxss_state *
to_xcsi2rxssstate(struct v4l2_subdev *subdev)
{
return container_of(subdev, struct xcsi2rxss_state, subdev);
}
/*
* Register related operations
*/
static inline u32 xcsi2rxss_read(struct xcsi2rxss_state *xcsi2rxss, u32 addr)
{
return ioread32(xcsi2rxss->iomem + addr);
}
static inline void xcsi2rxss_write(struct xcsi2rxss_state *xcsi2rxss, u32 addr,
u32 value)
{
iowrite32(value, xcsi2rxss->iomem + addr);
}
static inline void xcsi2rxss_clr(struct xcsi2rxss_state *xcsi2rxss, u32 addr,
u32 clr)
{
xcsi2rxss_write(xcsi2rxss, addr,
xcsi2rxss_read(xcsi2rxss, addr) & ~clr);
}
static inline void xcsi2rxss_set(struct xcsi2rxss_state *xcsi2rxss, u32 addr,
u32 set)
{
xcsi2rxss_write(xcsi2rxss, addr, xcsi2rxss_read(xcsi2rxss, addr) | set);
}
/*
* This function returns the nth mbus for a data type.
* In case of error, mbus code returned is 0.
*/
static u32 xcsi2rxss_get_nth_mbus(u32 dt, u32 n)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(xcsi2dt_mbus_lut); i++) {
if (xcsi2dt_mbus_lut[i][0] == dt) {
if (n-- == 0)
return xcsi2dt_mbus_lut[i][1];
}
}
return 0;
}
/* This returns the data type for a media bus format else 0 */
static u32 xcsi2rxss_get_dt(u32 mbus)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(xcsi2dt_mbus_lut); i++) {
if (xcsi2dt_mbus_lut[i][1] == mbus)
return xcsi2dt_mbus_lut[i][0];
}
return 0;
}
/**
* xcsi2rxss_soft_reset - Does a soft reset of the MIPI CSI-2 Rx Subsystem
* @state: Xilinx CSI-2 Rx Subsystem structure pointer
*
* Core takes less than 100 video clock cycles to reset.
* So a larger timeout value is chosen for margin.
*
* Return: 0 - on success OR -ETIME if reset times out
*/
static int xcsi2rxss_soft_reset(struct xcsi2rxss_state *state)
{
u32 timeout = 1000; /* us */
xcsi2rxss_set(state, XCSI_CCR_OFFSET, XCSI_CCR_SOFTRESET);
while (xcsi2rxss_read(state, XCSI_CSR_OFFSET) & XCSI_CSR_RIPCD) {
if (timeout == 0) {
dev_err(state->dev, "soft reset timed out!\n");
return -ETIME;
}
timeout--;
udelay(1);
}
xcsi2rxss_clr(state, XCSI_CCR_OFFSET, XCSI_CCR_SOFTRESET);
return 0;
}
static void xcsi2rxss_hard_reset(struct xcsi2rxss_state *state)
{
if (!state->rst_gpio)
return;
/* minimum of 40 dphy_clk_200M cycles */
gpiod_set_value_cansleep(state->rst_gpio, 1);
usleep_range(1, 2);
gpiod_set_value_cansleep(state->rst_gpio, 0);
}
static void xcsi2rxss_reset_event_counters(struct xcsi2rxss_state *state)
{
unsigned int i;
for (i = 0; i < XCSI_NUM_EVENTS; i++)
state->events[i] = 0;
for (i = 0; i < XCSI_VCX_NUM_EVENTS; i++)
state->vcx_events[i] = 0;
}
/* Print event counters */
static void xcsi2rxss_log_counters(struct xcsi2rxss_state *state)
{
struct device *dev = state->dev;
unsigned int i;
for (i = 0; i < XCSI_NUM_EVENTS; i++) {
if (state->events[i] > 0) {
dev_info(dev, "%s events: %d\n",
xcsi2rxss_events[i].name,
state->events[i]);
}
}
if (state->en_vcx) {
for (i = 0; i < XCSI_VCX_NUM_EVENTS; i++) {
if (state->vcx_events[i] > 0) {
dev_info(dev,
"VC %d Frame %s err vcx events: %d\n",
(i / 2) + XCSI_VCX_START,
i & 1 ? "Sync" : "Level",
state->vcx_events[i]);
}
}
}
}
/**
* xcsi2rxss_log_status - Logs the status of the CSI-2 Receiver
* @sd: Pointer to V4L2 subdevice structure
*
* This function prints the current status of Xilinx MIPI CSI-2
*
* Return: 0 on success
*/
static int xcsi2rxss_log_status(struct v4l2_subdev *sd)
{
struct xcsi2rxss_state *xcsi2rxss = to_xcsi2rxssstate(sd);
struct device *dev = xcsi2rxss->dev;
u32 reg, data;
unsigned int i, max_vc;
mutex_lock(&xcsi2rxss->lock);
xcsi2rxss_log_counters(xcsi2rxss);
dev_info(dev, "***** Core Status *****\n");
data = xcsi2rxss_read(xcsi2rxss, XCSI_CSR_OFFSET);
dev_info(dev, "Short Packet FIFO Full = %s\n",
data & XCSI_CSR_SPFIFOFULL ? "true" : "false");
dev_info(dev, "Short Packet FIFO Not Empty = %s\n",
data & XCSI_CSR_SPFIFONE ? "true" : "false");
dev_info(dev, "Stream line buffer full = %s\n",
data & XCSI_CSR_SLBF ? "true" : "false");
dev_info(dev, "Soft reset/Core disable in progress = %s\n",
data & XCSI_CSR_RIPCD ? "true" : "false");
/* Clk & Lane Info */
dev_info(dev, "******** Clock Lane Info *********\n");
data = xcsi2rxss_read(xcsi2rxss, XCSI_CLKINFR_OFFSET);
dev_info(dev, "Clock Lane in Stop State = %s\n",
data & XCSI_CLKINFR_STOP ? "true" : "false");
dev_info(dev, "******** Data Lane Info *********\n");
dev_info(dev, "Lane\tSoT Error\tSoT Sync Error\tStop State\n");
reg = XCSI_DLXINFR_OFFSET;
for (i = 0; i < XCSI_MAXDL_COUNT; i++) {
data = xcsi2rxss_read(xcsi2rxss, reg);
dev_info(dev, "%d\t%s\t\t%s\t\t%s\n", i,
data & XCSI_DLXINFR_SOTERR ? "true" : "false",
data & XCSI_DLXINFR_SOTSYNCERR ? "true" : "false",
data & XCSI_DLXINFR_STOP ? "true" : "false");
reg += XCSI_NEXTREG_OFFSET;
}
/* Virtual Channel Image Information */
dev_info(dev, "********** Virtual Channel Info ************\n");
dev_info(dev, "VC\tLine Count\tByte Count\tData Type\n");
if (xcsi2rxss->en_vcx)
max_vc = XCSI_MAX_VCX;
else
max_vc = XCSI_MAX_VC;
reg = XCSI_VCXINF1R_OFFSET;
for (i = 0; i < max_vc; i++) {
u32 line_count, byte_count, data_type;
/* Get line and byte count from VCXINFR1 Register */
data = xcsi2rxss_read(xcsi2rxss, reg);
byte_count = data & XCSI_VCXINF1R_BYTECOUNT;
line_count = data & XCSI_VCXINF1R_LINECOUNT;
line_count >>= XCSI_VCXINF1R_LINECOUNT_SHIFT;
/* Get data type from VCXINFR2 Register */
reg += XCSI_NEXTREG_OFFSET;
data = xcsi2rxss_read(xcsi2rxss, reg);
data_type = data & XCSI_VCXINF2R_DT;
dev_info(dev, "%d\t%d\t\t%d\t\t0x%x\n", i, line_count,
byte_count, data_type);
/* Move to next pair of VC Info registers */
reg += XCSI_NEXTREG_OFFSET;
}
mutex_unlock(&xcsi2rxss->lock);
return 0;
}
static struct v4l2_subdev *xcsi2rxss_get_remote_subdev(struct media_pad *local)
{
struct media_pad *remote;
remote = media_entity_remote_pad(local);
if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
return NULL;
return media_entity_to_v4l2_subdev(remote->entity);
}
static int xcsi2rxss_start_stream(struct xcsi2rxss_state *state)
{
int ret = 0;
/* enable core */
xcsi2rxss_set(state, XCSI_CCR_OFFSET, XCSI_CCR_ENABLE);
ret = xcsi2rxss_soft_reset(state);
if (ret) {
state->streaming = false;
return ret;
}
/* enable interrupts */
xcsi2rxss_clr(state, XCSI_GIER_OFFSET, XCSI_GIER_GIE);
xcsi2rxss_write(state, XCSI_IER_OFFSET, XCSI_IER_INTR_MASK);
xcsi2rxss_set(state, XCSI_GIER_OFFSET, XCSI_GIER_GIE);
state->streaming = true;
state->rsubdev =
xcsi2rxss_get_remote_subdev(&state->pads[XVIP_PAD_SINK]);
ret = v4l2_subdev_call(state->rsubdev, video, s_stream, 1);
if (ret) {
/* disable interrupts */
xcsi2rxss_clr(state, XCSI_IER_OFFSET, XCSI_IER_INTR_MASK);
xcsi2rxss_clr(state, XCSI_GIER_OFFSET, XCSI_GIER_GIE);
/* disable core */
xcsi2rxss_clr(state, XCSI_CCR_OFFSET, XCSI_CCR_ENABLE);
state->streaming = false;
}
return ret;
}
static void xcsi2rxss_stop_stream(struct xcsi2rxss_state *state)
{
v4l2_subdev_call(state->rsubdev, video, s_stream, 0);
/* disable interrupts */
xcsi2rxss_clr(state, XCSI_IER_OFFSET, XCSI_IER_INTR_MASK);
xcsi2rxss_clr(state, XCSI_GIER_OFFSET, XCSI_GIER_GIE);
/* disable core */
xcsi2rxss_clr(state, XCSI_CCR_OFFSET, XCSI_CCR_ENABLE);
state->streaming = false;
}
/**
* xcsi2rxss_irq_handler - Interrupt handler for CSI-2
* @irq: IRQ number
* @data: Pointer to device state
*
* In the interrupt handler, a list of event counters are updated for
* corresponding interrupts. This is useful to get status / debug.
*
* Return: IRQ_HANDLED after handling interrupts
*/
static irqreturn_t xcsi2rxss_irq_handler(int irq, void *data)
{
struct xcsi2rxss_state *state = (struct xcsi2rxss_state *)data;
struct device *dev = state->dev;
u32 status;
status = xcsi2rxss_read(state, XCSI_ISR_OFFSET) & XCSI_ISR_ALLINTR_MASK;
xcsi2rxss_write(state, XCSI_ISR_OFFSET, status);
/* Received a short packet */
if (status & XCSI_ISR_SPFIFONE) {
u32 count = 0;
/*
* Drain generic short packet FIFO by reading max 31
* (fifo depth) short packets from fifo or till fifo is empty.
*/
for (count = 0; count < XCSI_SPKT_FIFO_DEPTH; ++count) {
u32 spfifostat, spkt;
spkt = xcsi2rxss_read(state, XCSI_SPKTR_OFFSET);
dev_dbg(dev, "Short packet = 0x%08x\n", spkt);
spfifostat = xcsi2rxss_read(state, XCSI_ISR_OFFSET);
spfifostat &= XCSI_ISR_SPFIFONE;
if (!spfifostat)
break;
xcsi2rxss_write(state, XCSI_ISR_OFFSET, spfifostat);
}
}
/* Short packet FIFO overflow */
if (status & XCSI_ISR_SPFIFOF)
dev_dbg_ratelimited(dev, "Short packet FIFO overflowed\n");
/*
* Stream line buffer full
* This means there is a backpressure from downstream IP
*/
if (status & XCSI_ISR_SLBF) {
dev_alert_ratelimited(dev, "Stream Line Buffer Full!\n");
/* disable interrupts */
xcsi2rxss_clr(state, XCSI_IER_OFFSET, XCSI_IER_INTR_MASK);
xcsi2rxss_clr(state, XCSI_GIER_OFFSET, XCSI_GIER_GIE);
/* disable core */
xcsi2rxss_clr(state, XCSI_CCR_OFFSET, XCSI_CCR_ENABLE);
/*
* The IP needs to be hard reset before it can be used now.
* This will be done in streamoff.
*/
/*
* TODO: Notify the whole pipeline with v4l2_subdev_notify() to
* inform userspace.
*/
}
/* Increment event counters */
if (status & XCSI_ISR_ALLINTR_MASK) {
unsigned int i;
for (i = 0; i < XCSI_NUM_EVENTS; i++) {
if (!(status & xcsi2rxss_events[i].mask))
continue;
state->events[i]++;
dev_dbg_ratelimited(dev, "%s: %u\n",
xcsi2rxss_events[i].name,
state->events[i]);
}
if (status & XCSI_ISR_VCXFE && state->en_vcx) {
u32 vcxstatus;
vcxstatus = xcsi2rxss_read(state, XCSI_VCXR_OFFSET);
vcxstatus &= XCSI_VCXR_VCERR;
for (i = 0; i < XCSI_VCX_NUM_EVENTS; i++) {
if (!(vcxstatus & BIT(i)))
continue;
state->vcx_events[i]++;
}
xcsi2rxss_write(state, XCSI_VCXR_OFFSET, vcxstatus);
}
}
return IRQ_HANDLED;
}
/**
* xcsi2rxss_s_stream - It is used to start/stop the streaming.
* @sd: V4L2 Sub device
* @enable: Flag (True / False)
*
* This function controls the start or stop of streaming for the
* Xilinx MIPI CSI-2 Rx Subsystem.
*
* Return: 0 on success, errors otherwise
*/
static int xcsi2rxss_s_stream(struct v4l2_subdev *sd, int enable)
{
struct xcsi2rxss_state *xcsi2rxss = to_xcsi2rxssstate(sd);
int ret = 0;
mutex_lock(&xcsi2rxss->lock);
if (enable == xcsi2rxss->streaming)
goto stream_done;
if (enable) {
xcsi2rxss_reset_event_counters(xcsi2rxss);
ret = xcsi2rxss_start_stream(xcsi2rxss);
} else {
xcsi2rxss_stop_stream(xcsi2rxss);
xcsi2rxss_hard_reset(xcsi2rxss);
}
stream_done:
mutex_unlock(&xcsi2rxss->lock);
return ret;
}
static struct v4l2_mbus_framefmt *
__xcsi2rxss_get_pad_format(struct xcsi2rxss_state *xcsi2rxss,
struct v4l2_subdev_state *sd_state,
unsigned int pad, u32 which)
{
switch (which) {
case V4L2_SUBDEV_FORMAT_TRY:
return v4l2_subdev_get_try_format(&xcsi2rxss->subdev,
sd_state, pad);
case V4L2_SUBDEV_FORMAT_ACTIVE:
return &xcsi2rxss->format;
default:
return NULL;
}
}
/**
* xcsi2rxss_init_cfg - Initialise the pad format config to default
* @sd: Pointer to V4L2 Sub device structure
* @sd_state: Pointer to sub device state structure
*
* This function is used to initialize the pad format with the default
* values.
*
* Return: 0 on success
*/
static int xcsi2rxss_init_cfg(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state)
{
struct xcsi2rxss_state *xcsi2rxss = to_xcsi2rxssstate(sd);
struct v4l2_mbus_framefmt *format;
unsigned int i;
mutex_lock(&xcsi2rxss->lock);
for (i = 0; i < XCSI_MEDIA_PADS; i++) {
format = v4l2_subdev_get_try_format(sd, sd_state, i);
*format = xcsi2rxss->default_format;
}
mutex_unlock(&xcsi2rxss->lock);
return 0;
}
/**
* xcsi2rxss_get_format - Get the pad format
* @sd: Pointer to V4L2 Sub device structure
* @sd_state: Pointer to sub device state structure
* @fmt: Pointer to pad level media bus format
*
* This function is used to get the pad format information.
*
* Return: 0 on success
*/
static int xcsi2rxss_get_format(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_format *fmt)
{
struct xcsi2rxss_state *xcsi2rxss = to_xcsi2rxssstate(sd);
mutex_lock(&xcsi2rxss->lock);
fmt->format = *__xcsi2rxss_get_pad_format(xcsi2rxss, sd_state,
fmt->pad,
fmt->which);
mutex_unlock(&xcsi2rxss->lock);
return 0;
}
/**
* xcsi2rxss_set_format - This is used to set the pad format
* @sd: Pointer to V4L2 Sub device structure
* @sd_state: Pointer to sub device state structure
* @fmt: Pointer to pad level media bus format
*
* This function is used to set the pad format. Since the pad format is fixed
* in hardware, it can't be modified on run time. So when a format set is
* requested by application, all parameters except the format type is saved
* for the pad and the original pad format is sent back to the application.
*
* Return: 0 on success
*/
static int xcsi2rxss_set_format(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_format *fmt)
{
struct xcsi2rxss_state *xcsi2rxss = to_xcsi2rxssstate(sd);
struct v4l2_mbus_framefmt *__format;
u32 dt;
mutex_lock(&xcsi2rxss->lock);
/*
* Only the format->code parameter matters for CSI as the
* CSI format cannot be changed at runtime.
* Ensure that format to set is copied to over to CSI pad format
*/
__format = __xcsi2rxss_get_pad_format(xcsi2rxss, sd_state,
fmt->pad, fmt->which);
/* only sink pad format can be updated */
if (fmt->pad == XVIP_PAD_SOURCE) {
fmt->format = *__format;
mutex_unlock(&xcsi2rxss->lock);
return 0;
}
/*
* RAW8 is supported in all datatypes. So if requested media bus format
* is of RAW8 type, then allow to be set. In case core is configured to
* other RAW, YUV422 8/10 or RGB888, set appropriate media bus format.
*/
dt = xcsi2rxss_get_dt(fmt->format.code);
if (dt != xcsi2rxss->datatype && dt != MIPI_CSI2_DT_RAW8) {
dev_dbg(xcsi2rxss->dev, "Unsupported media bus format");
/* set the default format for the data type */
fmt->format.code = xcsi2rxss_get_nth_mbus(xcsi2rxss->datatype,
0);
}
*__format = fmt->format;
mutex_unlock(&xcsi2rxss->lock);
return 0;
}
/*
* xcsi2rxss_enum_mbus_code - Handle pixel format enumeration
* @sd: pointer to v4l2 subdev structure
* @cfg: V4L2 subdev pad configuration
* @code: pointer to v4l2_subdev_mbus_code_enum structure
*
* Return: -EINVAL or zero on success
*/
static int xcsi2rxss_enum_mbus_code(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_mbus_code_enum *code)
{
struct xcsi2rxss_state *state = to_xcsi2rxssstate(sd);
u32 dt, n;
int ret = 0;
/* RAW8 dt packets are available in all DT configurations */
if (code->index < 4) {
n = code->index;
dt = MIPI_CSI2_DT_RAW8;
} else if (state->datatype != MIPI_CSI2_DT_RAW8) {
n = code->index - 4;
dt = state->datatype;
} else {
return -EINVAL;
}
code->code = xcsi2rxss_get_nth_mbus(dt, n);
if (!code->code)
ret = -EINVAL;
return ret;
}
/* -----------------------------------------------------------------------------
* Media Operations
*/
static const struct media_entity_operations xcsi2rxss_media_ops = {
.link_validate = v4l2_subdev_link_validate
};
static const struct v4l2_subdev_core_ops xcsi2rxss_core_ops = {
.log_status = xcsi2rxss_log_status,
};
static const struct v4l2_subdev_video_ops xcsi2rxss_video_ops = {
.s_stream = xcsi2rxss_s_stream
};
static const struct v4l2_subdev_pad_ops xcsi2rxss_pad_ops = {
.init_cfg = xcsi2rxss_init_cfg,
.get_fmt = xcsi2rxss_get_format,
.set_fmt = xcsi2rxss_set_format,
.enum_mbus_code = xcsi2rxss_enum_mbus_code,
.link_validate = v4l2_subdev_link_validate_default,
};
static const struct v4l2_subdev_ops xcsi2rxss_ops = {
.core = &xcsi2rxss_core_ops,
.video = &xcsi2rxss_video_ops,
.pad = &xcsi2rxss_pad_ops
};
static int xcsi2rxss_parse_of(struct xcsi2rxss_state *xcsi2rxss)
{
struct device *dev = xcsi2rxss->dev;
struct device_node *node = dev->of_node;
struct fwnode_handle *ep;
struct v4l2_fwnode_endpoint vep = {
.bus_type = V4L2_MBUS_CSI2_DPHY
};
bool en_csi_v20, vfb;
int ret;
en_csi_v20 = of_property_read_bool(node, "xlnx,en-csi-v2-0");
if (en_csi_v20)
xcsi2rxss->en_vcx = of_property_read_bool(node, "xlnx,en-vcx");
xcsi2rxss->enable_active_lanes =
of_property_read_bool(node, "xlnx,en-active-lanes");
ret = of_property_read_u32(node, "xlnx,csi-pxl-format",
&xcsi2rxss->datatype);
if (ret < 0) {
dev_err(dev, "missing xlnx,csi-pxl-format property\n");
return ret;
}
switch (xcsi2rxss->datatype) {
case MIPI_CSI2_DT_YUV422_8B:
case MIPI_CSI2_DT_RGB444:
case MIPI_CSI2_DT_RGB555:
case MIPI_CSI2_DT_RGB565:
case MIPI_CSI2_DT_RGB666:
case MIPI_CSI2_DT_RGB888:
case MIPI_CSI2_DT_RAW6:
case MIPI_CSI2_DT_RAW7:
case MIPI_CSI2_DT_RAW8:
case MIPI_CSI2_DT_RAW10:
case MIPI_CSI2_DT_RAW12:
case MIPI_CSI2_DT_RAW14:
break;
case MIPI_CSI2_DT_YUV422_10B:
case MIPI_CSI2_DT_RAW16:
case MIPI_CSI2_DT_RAW20:
if (!en_csi_v20) {
ret = -EINVAL;
dev_dbg(dev, "enable csi v2 for this pixel format");
}
break;
default:
ret = -EINVAL;
}
if (ret < 0) {
dev_err(dev, "invalid csi-pxl-format property!\n");
return ret;
}
vfb = of_property_read_bool(node, "xlnx,vfb");
if (!vfb) {
dev_err(dev, "operation without VFB is not supported\n");
return -EINVAL;
}
ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
XVIP_PAD_SINK, 0,
FWNODE_GRAPH_ENDPOINT_NEXT);
if (!ep) {
dev_err(dev, "no sink port found");
return -EINVAL;
}
ret = v4l2_fwnode_endpoint_parse(ep, &vep);
fwnode_handle_put(ep);
if (ret) {
dev_err(dev, "error parsing sink port");
return ret;
}
dev_dbg(dev, "mipi number lanes = %d\n",
vep.bus.mipi_csi2.num_data_lanes);
xcsi2rxss->max_num_lanes = vep.bus.mipi_csi2.num_data_lanes;
ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
XVIP_PAD_SOURCE, 0,
FWNODE_GRAPH_ENDPOINT_NEXT);
if (!ep) {
dev_err(dev, "no source port found");
return -EINVAL;
}
fwnode_handle_put(ep);
dev_dbg(dev, "vcx %s, %u data lanes (%s), data type 0x%02x\n",
xcsi2rxss->en_vcx ? "enabled" : "disabled",
xcsi2rxss->max_num_lanes,
xcsi2rxss->enable_active_lanes ? "dynamic" : "static",
xcsi2rxss->datatype);
return 0;
}
static int xcsi2rxss_probe(struct platform_device *pdev)
{
struct v4l2_subdev *subdev;
struct xcsi2rxss_state *xcsi2rxss;
int num_clks = ARRAY_SIZE(xcsi2rxss_clks);
struct device *dev = &pdev->dev;
int irq, ret;
xcsi2rxss = devm_kzalloc(dev, sizeof(*xcsi2rxss), GFP_KERNEL);
if (!xcsi2rxss)
return -ENOMEM;
xcsi2rxss->dev = dev;
xcsi2rxss->clks = devm_kmemdup(dev, xcsi2rxss_clks,
sizeof(xcsi2rxss_clks), GFP_KERNEL);
if (!xcsi2rxss->clks)
return -ENOMEM;
/* Reset GPIO */
xcsi2rxss->rst_gpio = devm_gpiod_get_optional(dev, "video-reset",
GPIOD_OUT_HIGH);
if (IS_ERR(xcsi2rxss->rst_gpio)) {
if (PTR_ERR(xcsi2rxss->rst_gpio) != -EPROBE_DEFER)
dev_err(dev, "Video Reset GPIO not setup in DT");
return PTR_ERR(xcsi2rxss->rst_gpio);
}
ret = xcsi2rxss_parse_of(xcsi2rxss);
if (ret < 0)
return ret;
xcsi2rxss->iomem = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(xcsi2rxss->iomem))
return PTR_ERR(xcsi2rxss->iomem);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
ret = devm_request_threaded_irq(dev, irq, NULL,
xcsi2rxss_irq_handler, IRQF_ONESHOT,
dev_name(dev), xcsi2rxss);
if (ret) {
dev_err(dev, "Err = %d Interrupt handler reg failed!\n", ret);
return ret;
}
ret = clk_bulk_get(dev, num_clks, xcsi2rxss->clks);
if (ret)
return ret;
/* TODO: Enable/disable clocks at stream on/off time. */
ret = clk_bulk_prepare_enable(num_clks, xcsi2rxss->clks);
if (ret)
goto err_clk_put;
mutex_init(&xcsi2rxss->lock);
xcsi2rxss_hard_reset(xcsi2rxss);
xcsi2rxss_soft_reset(xcsi2rxss);
/* Initialize V4L2 subdevice and media entity */
xcsi2rxss->pads[XVIP_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
xcsi2rxss->pads[XVIP_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
/* Initialize the default format */
xcsi2rxss->default_format.code =
xcsi2rxss_get_nth_mbus(xcsi2rxss->datatype, 0);
xcsi2rxss->default_format.field = V4L2_FIELD_NONE;
xcsi2rxss->default_format.colorspace = V4L2_COLORSPACE_SRGB;
xcsi2rxss->default_format.width = XCSI_DEFAULT_WIDTH;
xcsi2rxss->default_format.height = XCSI_DEFAULT_HEIGHT;
xcsi2rxss->format = xcsi2rxss->default_format;
/* Initialize V4L2 subdevice and media entity */
subdev = &xcsi2rxss->subdev;
v4l2_subdev_init(subdev, &xcsi2rxss_ops);
subdev->dev = dev;
strscpy(subdev->name, dev_name(dev), sizeof(subdev->name));
subdev->flags |= V4L2_SUBDEV_FL_HAS_EVENTS | V4L2_SUBDEV_FL_HAS_DEVNODE;
subdev->entity.ops = &xcsi2rxss_media_ops;
v4l2_set_subdevdata(subdev, xcsi2rxss);
ret = media_entity_pads_init(&subdev->entity, XCSI_MEDIA_PADS,
xcsi2rxss->pads);
if (ret < 0)
goto error;
platform_set_drvdata(pdev, xcsi2rxss);
ret = v4l2_async_register_subdev(subdev);
if (ret < 0) {
dev_err(dev, "failed to register subdev\n");
goto error;
}
return 0;
error:
media_entity_cleanup(&subdev->entity);
mutex_destroy(&xcsi2rxss->lock);
clk_bulk_disable_unprepare(num_clks, xcsi2rxss->clks);
err_clk_put:
clk_bulk_put(num_clks, xcsi2rxss->clks);
return ret;
}
static int xcsi2rxss_remove(struct platform_device *pdev)
{
struct xcsi2rxss_state *xcsi2rxss = platform_get_drvdata(pdev);
struct v4l2_subdev *subdev = &xcsi2rxss->subdev;
int num_clks = ARRAY_SIZE(xcsi2rxss_clks);
v4l2_async_unregister_subdev(subdev);
media_entity_cleanup(&subdev->entity);
mutex_destroy(&xcsi2rxss->lock);
clk_bulk_disable_unprepare(num_clks, xcsi2rxss->clks);
clk_bulk_put(num_clks, xcsi2rxss->clks);
return 0;
}
static const struct of_device_id xcsi2rxss_of_id_table[] = {
{ .compatible = "xlnx,mipi-csi2-rx-subsystem-5.0", },
{ }
};
MODULE_DEVICE_TABLE(of, xcsi2rxss_of_id_table);
static struct platform_driver xcsi2rxss_driver = {
.driver = {
.name = "xilinx-csi2rxss",
.of_match_table = xcsi2rxss_of_id_table,
},
.probe = xcsi2rxss_probe,
.remove = xcsi2rxss_remove,
};
module_platform_driver(xcsi2rxss_driver);
MODULE_AUTHOR("Vishal Sagar <vsagar@xilinx.com>");
MODULE_DESCRIPTION("Xilinx MIPI CSI-2 Rx Subsystem Driver");
MODULE_LICENSE("GPL v2");
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