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path: root/drivers/media/platform/exynos4-is/mipi-csis.c
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Diffstat (limited to 'drivers/media/platform/exynos4-is/mipi-csis.c')
-rw-r--r--drivers/media/platform/exynos4-is/mipi-csis.c1019
1 files changed, 1019 insertions, 0 deletions
diff --git a/drivers/media/platform/exynos4-is/mipi-csis.c b/drivers/media/platform/exynos4-is/mipi-csis.c
new file mode 100644
index 00000000000..a2eda9d5ac8
--- /dev/null
+++ b/drivers/media/platform/exynos4-is/mipi-csis.c
@@ -0,0 +1,1019 @@
+/*
+ * Samsung S5P/EXYNOS4 SoC series MIPI-CSI receiver driver
+ *
+ * Copyright (C) 2011 - 2012 Samsung Electronics Co., Ltd.
+ * Sylwester Nawrocki <s.nawrocki@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/memory.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_data/mipi-csis.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/videodev2.h>
+#include <media/s5p_fimc.h>
+#include <media/v4l2-of.h>
+#include <media/v4l2-subdev.h>
+
+#include "mipi-csis.h"
+
+static int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Debug level (0-2)");
+
+/* Register map definition */
+
+/* CSIS global control */
+#define S5PCSIS_CTRL 0x00
+#define S5PCSIS_CTRL_DPDN_DEFAULT (0 << 31)
+#define S5PCSIS_CTRL_DPDN_SWAP (1 << 31)
+#define S5PCSIS_CTRL_ALIGN_32BIT (1 << 20)
+#define S5PCSIS_CTRL_UPDATE_SHADOW (1 << 16)
+#define S5PCSIS_CTRL_WCLK_EXTCLK (1 << 8)
+#define S5PCSIS_CTRL_RESET (1 << 4)
+#define S5PCSIS_CTRL_ENABLE (1 << 0)
+
+/* D-PHY control */
+#define S5PCSIS_DPHYCTRL 0x04
+#define S5PCSIS_DPHYCTRL_HSS_MASK (0x1f << 27)
+#define S5PCSIS_DPHYCTRL_ENABLE (0x1f << 0)
+
+#define S5PCSIS_CONFIG 0x08
+#define S5PCSIS_CFG_FMT_YCBCR422_8BIT (0x1e << 2)
+#define S5PCSIS_CFG_FMT_RAW8 (0x2a << 2)
+#define S5PCSIS_CFG_FMT_RAW10 (0x2b << 2)
+#define S5PCSIS_CFG_FMT_RAW12 (0x2c << 2)
+/* User defined formats, x = 1...4 */
+#define S5PCSIS_CFG_FMT_USER(x) ((0x30 + x - 1) << 2)
+#define S5PCSIS_CFG_FMT_MASK (0x3f << 2)
+#define S5PCSIS_CFG_NR_LANE_MASK 3
+
+/* Interrupt mask */
+#define S5PCSIS_INTMSK 0x10
+#define S5PCSIS_INTMSK_EN_ALL 0xf000103f
+#define S5PCSIS_INTMSK_EVEN_BEFORE (1 << 31)
+#define S5PCSIS_INTMSK_EVEN_AFTER (1 << 30)
+#define S5PCSIS_INTMSK_ODD_BEFORE (1 << 29)
+#define S5PCSIS_INTMSK_ODD_AFTER (1 << 28)
+#define S5PCSIS_INTMSK_ERR_SOT_HS (1 << 12)
+#define S5PCSIS_INTMSK_ERR_LOST_FS (1 << 5)
+#define S5PCSIS_INTMSK_ERR_LOST_FE (1 << 4)
+#define S5PCSIS_INTMSK_ERR_OVER (1 << 3)
+#define S5PCSIS_INTMSK_ERR_ECC (1 << 2)
+#define S5PCSIS_INTMSK_ERR_CRC (1 << 1)
+#define S5PCSIS_INTMSK_ERR_UNKNOWN (1 << 0)
+
+/* Interrupt source */
+#define S5PCSIS_INTSRC 0x14
+#define S5PCSIS_INTSRC_EVEN_BEFORE (1 << 31)
+#define S5PCSIS_INTSRC_EVEN_AFTER (1 << 30)
+#define S5PCSIS_INTSRC_EVEN (0x3 << 30)
+#define S5PCSIS_INTSRC_ODD_BEFORE (1 << 29)
+#define S5PCSIS_INTSRC_ODD_AFTER (1 << 28)
+#define S5PCSIS_INTSRC_ODD (0x3 << 28)
+#define S5PCSIS_INTSRC_NON_IMAGE_DATA (0xff << 28)
+#define S5PCSIS_INTSRC_ERR_SOT_HS (0xf << 12)
+#define S5PCSIS_INTSRC_ERR_LOST_FS (1 << 5)
+#define S5PCSIS_INTSRC_ERR_LOST_FE (1 << 4)
+#define S5PCSIS_INTSRC_ERR_OVER (1 << 3)
+#define S5PCSIS_INTSRC_ERR_ECC (1 << 2)
+#define S5PCSIS_INTSRC_ERR_CRC (1 << 1)
+#define S5PCSIS_INTSRC_ERR_UNKNOWN (1 << 0)
+#define S5PCSIS_INTSRC_ERRORS 0xf03f
+
+/* Pixel resolution */
+#define S5PCSIS_RESOL 0x2c
+#define CSIS_MAX_PIX_WIDTH 0xffff
+#define CSIS_MAX_PIX_HEIGHT 0xffff
+
+/* Non-image packet data buffers */
+#define S5PCSIS_PKTDATA_ODD 0x2000
+#define S5PCSIS_PKTDATA_EVEN 0x3000
+#define S5PCSIS_PKTDATA_SIZE SZ_4K
+
+enum {
+ CSIS_CLK_MUX,
+ CSIS_CLK_GATE,
+};
+
+static char *csi_clock_name[] = {
+ [CSIS_CLK_MUX] = "sclk_csis",
+ [CSIS_CLK_GATE] = "csis",
+};
+#define NUM_CSIS_CLOCKS ARRAY_SIZE(csi_clock_name)
+#define DEFAULT_SCLK_CSIS_FREQ 166000000UL
+
+static const char * const csis_supply_name[] = {
+ "vddcore", /* CSIS Core (1.0V, 1.1V or 1.2V) suppply */
+ "vddio", /* CSIS I/O and PLL (1.8V) supply */
+};
+#define CSIS_NUM_SUPPLIES ARRAY_SIZE(csis_supply_name)
+
+enum {
+ ST_POWERED = 1,
+ ST_STREAMING = 2,
+ ST_SUSPENDED = 4,
+};
+
+struct s5pcsis_event {
+ u32 mask;
+ const char * const name;
+ unsigned int counter;
+};
+
+static const struct s5pcsis_event s5pcsis_events[] = {
+ /* Errors */
+ { S5PCSIS_INTSRC_ERR_SOT_HS, "SOT Error" },
+ { S5PCSIS_INTSRC_ERR_LOST_FS, "Lost Frame Start Error" },
+ { S5PCSIS_INTSRC_ERR_LOST_FE, "Lost Frame End Error" },
+ { S5PCSIS_INTSRC_ERR_OVER, "FIFO Overflow Error" },
+ { S5PCSIS_INTSRC_ERR_ECC, "ECC Error" },
+ { S5PCSIS_INTSRC_ERR_CRC, "CRC Error" },
+ { S5PCSIS_INTSRC_ERR_UNKNOWN, "Unknown Error" },
+ /* Non-image data receive events */
+ { S5PCSIS_INTSRC_EVEN_BEFORE, "Non-image data before even frame" },
+ { S5PCSIS_INTSRC_EVEN_AFTER, "Non-image data after even frame" },
+ { S5PCSIS_INTSRC_ODD_BEFORE, "Non-image data before odd frame" },
+ { S5PCSIS_INTSRC_ODD_AFTER, "Non-image data after odd frame" },
+};
+#define S5PCSIS_NUM_EVENTS ARRAY_SIZE(s5pcsis_events)
+
+struct csis_pktbuf {
+ u32 *data;
+ unsigned int len;
+};
+
+/**
+ * struct csis_state - the driver's internal state data structure
+ * @lock: mutex serializing the subdev and power management operations,
+ * protecting @format and @flags members
+ * @pads: CSIS pads array
+ * @sd: v4l2_subdev associated with CSIS device instance
+ * @index: the hardware instance index
+ * @pdev: CSIS platform device
+ * @regs: mmaped I/O registers memory
+ * @supplies: CSIS regulator supplies
+ * @clock: CSIS clocks
+ * @irq: requested s5p-mipi-csis irq number
+ * @flags: the state variable for power and streaming control
+ * @clock_frequency: device bus clock frequency
+ * @hs_settle: HS-RX settle time
+ * @num_lanes: number of MIPI-CSI data lanes used
+ * @max_num_lanes: maximum number of MIPI-CSI data lanes supported
+ * @wclk_ext: CSI wrapper clock: 0 - bus clock, 1 - external SCLK_CAM
+ * @csis_fmt: current CSIS pixel format
+ * @format: common media bus format for the source and sink pad
+ * @slock: spinlock protecting structure members below
+ * @pkt_buf: the frame embedded (non-image) data buffer
+ * @events: MIPI-CSIS event (error) counters
+ */
+struct csis_state {
+ struct mutex lock;
+ struct media_pad pads[CSIS_PADS_NUM];
+ struct v4l2_subdev sd;
+ u8 index;
+ struct platform_device *pdev;
+ void __iomem *regs;
+ struct regulator_bulk_data supplies[CSIS_NUM_SUPPLIES];
+ struct clk *clock[NUM_CSIS_CLOCKS];
+ int irq;
+ u32 flags;
+
+ u32 clk_frequency;
+ u32 hs_settle;
+ u32 num_lanes;
+ u32 max_num_lanes;
+ u8 wclk_ext;
+
+ const struct csis_pix_format *csis_fmt;
+ struct v4l2_mbus_framefmt format;
+
+ spinlock_t slock;
+ struct csis_pktbuf pkt_buf;
+ struct s5pcsis_event events[S5PCSIS_NUM_EVENTS];
+};
+
+/**
+ * struct csis_pix_format - CSIS pixel format description
+ * @pix_width_alignment: horizontal pixel alignment, width will be
+ * multiple of 2^pix_width_alignment
+ * @code: corresponding media bus code
+ * @fmt_reg: S5PCSIS_CONFIG register value
+ * @data_alignment: MIPI-CSI data alignment in bits
+ */
+struct csis_pix_format {
+ unsigned int pix_width_alignment;
+ enum v4l2_mbus_pixelcode code;
+ u32 fmt_reg;
+ u8 data_alignment;
+};
+
+static const struct csis_pix_format s5pcsis_formats[] = {
+ {
+ .code = V4L2_MBUS_FMT_VYUY8_2X8,
+ .fmt_reg = S5PCSIS_CFG_FMT_YCBCR422_8BIT,
+ .data_alignment = 32,
+ }, {
+ .code = V4L2_MBUS_FMT_JPEG_1X8,
+ .fmt_reg = S5PCSIS_CFG_FMT_USER(1),
+ .data_alignment = 32,
+ }, {
+ .code = V4L2_MBUS_FMT_S5C_UYVY_JPEG_1X8,
+ .fmt_reg = S5PCSIS_CFG_FMT_USER(1),
+ .data_alignment = 32,
+ }, {
+ .code = V4L2_MBUS_FMT_SGRBG8_1X8,
+ .fmt_reg = S5PCSIS_CFG_FMT_RAW8,
+ .data_alignment = 24,
+ }, {
+ .code = V4L2_MBUS_FMT_SGRBG10_1X10,
+ .fmt_reg = S5PCSIS_CFG_FMT_RAW10,
+ .data_alignment = 24,
+ }, {
+ .code = V4L2_MBUS_FMT_SGRBG12_1X12,
+ .fmt_reg = S5PCSIS_CFG_FMT_RAW12,
+ .data_alignment = 24,
+ }
+};
+
+#define s5pcsis_write(__csis, __r, __v) writel(__v, __csis->regs + __r)
+#define s5pcsis_read(__csis, __r) readl(__csis->regs + __r)
+
+static struct csis_state *sd_to_csis_state(struct v4l2_subdev *sdev)
+{
+ return container_of(sdev, struct csis_state, sd);
+}
+
+static const struct csis_pix_format *find_csis_format(
+ struct v4l2_mbus_framefmt *mf)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(s5pcsis_formats); i++)
+ if (mf->code == s5pcsis_formats[i].code)
+ return &s5pcsis_formats[i];
+ return NULL;
+}
+
+static void s5pcsis_enable_interrupts(struct csis_state *state, bool on)
+{
+ u32 val = s5pcsis_read(state, S5PCSIS_INTMSK);
+
+ val = on ? val | S5PCSIS_INTMSK_EN_ALL :
+ val & ~S5PCSIS_INTMSK_EN_ALL;
+ s5pcsis_write(state, S5PCSIS_INTMSK, val);
+}
+
+static void s5pcsis_reset(struct csis_state *state)
+{
+ u32 val = s5pcsis_read(state, S5PCSIS_CTRL);
+
+ s5pcsis_write(state, S5PCSIS_CTRL, val | S5PCSIS_CTRL_RESET);
+ udelay(10);
+}
+
+static void s5pcsis_system_enable(struct csis_state *state, int on)
+{
+ u32 val, mask;
+
+ val = s5pcsis_read(state, S5PCSIS_CTRL);
+ if (on)
+ val |= S5PCSIS_CTRL_ENABLE;
+ else
+ val &= ~S5PCSIS_CTRL_ENABLE;
+ s5pcsis_write(state, S5PCSIS_CTRL, val);
+
+ val = s5pcsis_read(state, S5PCSIS_DPHYCTRL);
+ val &= ~S5PCSIS_DPHYCTRL_ENABLE;
+ if (on) {
+ mask = (1 << (state->num_lanes + 1)) - 1;
+ val |= (mask & S5PCSIS_DPHYCTRL_ENABLE);
+ }
+ s5pcsis_write(state, S5PCSIS_DPHYCTRL, val);
+}
+
+/* Called with the state.lock mutex held */
+static void __s5pcsis_set_format(struct csis_state *state)
+{
+ struct v4l2_mbus_framefmt *mf = &state->format;
+ u32 val;
+
+ v4l2_dbg(1, debug, &state->sd, "fmt: %#x, %d x %d\n",
+ mf->code, mf->width, mf->height);
+
+ /* Color format */
+ val = s5pcsis_read(state, S5PCSIS_CONFIG);
+ val = (val & ~S5PCSIS_CFG_FMT_MASK) | state->csis_fmt->fmt_reg;
+ s5pcsis_write(state, S5PCSIS_CONFIG, val);
+
+ /* Pixel resolution */
+ val = (mf->width << 16) | mf->height;
+ s5pcsis_write(state, S5PCSIS_RESOL, val);
+}
+
+static void s5pcsis_set_hsync_settle(struct csis_state *state, int settle)
+{
+ u32 val = s5pcsis_read(state, S5PCSIS_DPHYCTRL);
+
+ val = (val & ~S5PCSIS_DPHYCTRL_HSS_MASK) | (settle << 27);
+ s5pcsis_write(state, S5PCSIS_DPHYCTRL, val);
+}
+
+static void s5pcsis_set_params(struct csis_state *state)
+{
+ u32 val;
+
+ val = s5pcsis_read(state, S5PCSIS_CONFIG);
+ val = (val & ~S5PCSIS_CFG_NR_LANE_MASK) | (state->num_lanes - 1);
+ s5pcsis_write(state, S5PCSIS_CONFIG, val);
+
+ __s5pcsis_set_format(state);
+ s5pcsis_set_hsync_settle(state, state->hs_settle);
+
+ val = s5pcsis_read(state, S5PCSIS_CTRL);
+ if (state->csis_fmt->data_alignment == 32)
+ val |= S5PCSIS_CTRL_ALIGN_32BIT;
+ else /* 24-bits */
+ val &= ~S5PCSIS_CTRL_ALIGN_32BIT;
+
+ val &= ~S5PCSIS_CTRL_WCLK_EXTCLK;
+ if (state->wclk_ext)
+ val |= S5PCSIS_CTRL_WCLK_EXTCLK;
+ s5pcsis_write(state, S5PCSIS_CTRL, val);
+
+ /* Update the shadow register. */
+ val = s5pcsis_read(state, S5PCSIS_CTRL);
+ s5pcsis_write(state, S5PCSIS_CTRL, val | S5PCSIS_CTRL_UPDATE_SHADOW);
+}
+
+static void s5pcsis_clk_put(struct csis_state *state)
+{
+ int i;
+
+ for (i = 0; i < NUM_CSIS_CLOCKS; i++) {
+ if (IS_ERR(state->clock[i]))
+ continue;
+ clk_unprepare(state->clock[i]);
+ clk_put(state->clock[i]);
+ state->clock[i] = ERR_PTR(-EINVAL);
+ }
+}
+
+static int s5pcsis_clk_get(struct csis_state *state)
+{
+ struct device *dev = &state->pdev->dev;
+ int i, ret;
+
+ for (i = 0; i < NUM_CSIS_CLOCKS; i++)
+ state->clock[i] = ERR_PTR(-EINVAL);
+
+ for (i = 0; i < NUM_CSIS_CLOCKS; i++) {
+ state->clock[i] = clk_get(dev, csi_clock_name[i]);
+ if (IS_ERR(state->clock[i])) {
+ ret = PTR_ERR(state->clock[i]);
+ goto err;
+ }
+ ret = clk_prepare(state->clock[i]);
+ if (ret < 0) {
+ clk_put(state->clock[i]);
+ state->clock[i] = ERR_PTR(-EINVAL);
+ goto err;
+ }
+ }
+ return 0;
+err:
+ s5pcsis_clk_put(state);
+ dev_err(dev, "failed to get clock: %s\n", csi_clock_name[i]);
+ return ret;
+}
+
+static void dump_regs(struct csis_state *state, const char *label)
+{
+ struct {
+ u32 offset;
+ const char * const name;
+ } registers[] = {
+ { 0x00, "CTRL" },
+ { 0x04, "DPHYCTRL" },
+ { 0x08, "CONFIG" },
+ { 0x0c, "DPHYSTS" },
+ { 0x10, "INTMSK" },
+ { 0x2c, "RESOL" },
+ { 0x38, "SDW_CONFIG" },
+ };
+ u32 i;
+
+ v4l2_info(&state->sd, "--- %s ---\n", label);
+
+ for (i = 0; i < ARRAY_SIZE(registers); i++) {
+ u32 cfg = s5pcsis_read(state, registers[i].offset);
+ v4l2_info(&state->sd, "%10s: 0x%08x\n", registers[i].name, cfg);
+ }
+}
+
+static void s5pcsis_start_stream(struct csis_state *state)
+{
+ s5pcsis_reset(state);
+ s5pcsis_set_params(state);
+ s5pcsis_system_enable(state, true);
+ s5pcsis_enable_interrupts(state, true);
+}
+
+static void s5pcsis_stop_stream(struct csis_state *state)
+{
+ s5pcsis_enable_interrupts(state, false);
+ s5pcsis_system_enable(state, false);
+}
+
+static void s5pcsis_clear_counters(struct csis_state *state)
+{
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&state->slock, flags);
+ for (i = 0; i < S5PCSIS_NUM_EVENTS; i++)
+ state->events[i].counter = 0;
+ spin_unlock_irqrestore(&state->slock, flags);
+}
+
+static void s5pcsis_log_counters(struct csis_state *state, bool non_errors)
+{
+ int i = non_errors ? S5PCSIS_NUM_EVENTS : S5PCSIS_NUM_EVENTS - 4;
+ unsigned long flags;
+
+ spin_lock_irqsave(&state->slock, flags);
+
+ for (i--; i >= 0; i--) {
+ if (state->events[i].counter > 0 || debug)
+ v4l2_info(&state->sd, "%s events: %d\n",
+ state->events[i].name,
+ state->events[i].counter);
+ }
+ spin_unlock_irqrestore(&state->slock, flags);
+}
+
+/*
+ * V4L2 subdev operations
+ */
+static int s5pcsis_s_power(struct v4l2_subdev *sd, int on)
+{
+ struct csis_state *state = sd_to_csis_state(sd);
+ struct device *dev = &state->pdev->dev;
+
+ if (on)
+ return pm_runtime_get_sync(dev);
+
+ return pm_runtime_put_sync(dev);
+}
+
+static int s5pcsis_s_stream(struct v4l2_subdev *sd, int enable)
+{
+ struct csis_state *state = sd_to_csis_state(sd);
+ int ret = 0;
+
+ v4l2_dbg(1, debug, sd, "%s: %d, state: 0x%x\n",
+ __func__, enable, state->flags);
+
+ if (enable) {
+ s5pcsis_clear_counters(state);
+ ret = pm_runtime_get_sync(&state->pdev->dev);
+ if (ret && ret != 1)
+ return ret;
+ }
+
+ mutex_lock(&state->lock);
+ if (enable) {
+ if (state->flags & ST_SUSPENDED) {
+ ret = -EBUSY;
+ goto unlock;
+ }
+ s5pcsis_start_stream(state);
+ state->flags |= ST_STREAMING;
+ } else {
+ s5pcsis_stop_stream(state);
+ state->flags &= ~ST_STREAMING;
+ if (debug > 0)
+ s5pcsis_log_counters(state, true);
+ }
+unlock:
+ mutex_unlock(&state->lock);
+ if (!enable)
+ pm_runtime_put(&state->pdev->dev);
+
+ return ret == 1 ? 0 : ret;
+}
+
+static int s5pcsis_enum_mbus_code(struct v4l2_subdev *sd,
+ struct v4l2_subdev_fh *fh,
+ struct v4l2_subdev_mbus_code_enum *code)
+{
+ if (code->index >= ARRAY_SIZE(s5pcsis_formats))
+ return -EINVAL;
+
+ code->code = s5pcsis_formats[code->index].code;
+ return 0;
+}
+
+static struct csis_pix_format const *s5pcsis_try_format(
+ struct v4l2_mbus_framefmt *mf)
+{
+ struct csis_pix_format const *csis_fmt;
+
+ csis_fmt = find_csis_format(mf);
+ if (csis_fmt == NULL)
+ csis_fmt = &s5pcsis_formats[0];
+
+ mf->code = csis_fmt->code;
+ v4l_bound_align_image(&mf->width, 1, CSIS_MAX_PIX_WIDTH,
+ csis_fmt->pix_width_alignment,
+ &mf->height, 1, CSIS_MAX_PIX_HEIGHT, 1,
+ 0);
+ return csis_fmt;
+}
+
+static struct v4l2_mbus_framefmt *__s5pcsis_get_format(
+ struct csis_state *state, struct v4l2_subdev_fh *fh,
+ enum v4l2_subdev_format_whence which)
+{
+ if (which == V4L2_SUBDEV_FORMAT_TRY)
+ return fh ? v4l2_subdev_get_try_format(fh, 0) : NULL;
+
+ return &state->format;
+}
+
+static int s5pcsis_set_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
+ struct v4l2_subdev_format *fmt)
+{
+ struct csis_state *state = sd_to_csis_state(sd);
+ struct csis_pix_format const *csis_fmt;
+ struct v4l2_mbus_framefmt *mf;
+
+ mf = __s5pcsis_get_format(state, fh, fmt->which);
+
+ if (fmt->pad == CSIS_PAD_SOURCE) {
+ if (mf) {
+ mutex_lock(&state->lock);
+ fmt->format = *mf;
+ mutex_unlock(&state->lock);
+ }
+ return 0;
+ }
+ csis_fmt = s5pcsis_try_format(&fmt->format);
+ if (mf) {
+ mutex_lock(&state->lock);
+ *mf = fmt->format;
+ if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE)
+ state->csis_fmt = csis_fmt;
+ mutex_unlock(&state->lock);
+ }
+ return 0;
+}
+
+static int s5pcsis_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
+ struct v4l2_subdev_format *fmt)
+{
+ struct csis_state *state = sd_to_csis_state(sd);
+ struct v4l2_mbus_framefmt *mf;
+
+ mf = __s5pcsis_get_format(state, fh, fmt->which);
+ if (!mf)
+ return -EINVAL;
+
+ mutex_lock(&state->lock);
+ fmt->format = *mf;
+ mutex_unlock(&state->lock);
+ return 0;
+}
+
+static int s5pcsis_s_rx_buffer(struct v4l2_subdev *sd, void *buf,
+ unsigned int *size)
+{
+ struct csis_state *state = sd_to_csis_state(sd);
+ unsigned long flags;
+
+ *size = min_t(unsigned int, *size, S5PCSIS_PKTDATA_SIZE);
+
+ spin_lock_irqsave(&state->slock, flags);
+ state->pkt_buf.data = buf;
+ state->pkt_buf.len = *size;
+ spin_unlock_irqrestore(&state->slock, flags);
+
+ return 0;
+}
+
+static int s5pcsis_log_status(struct v4l2_subdev *sd)
+{
+ struct csis_state *state = sd_to_csis_state(sd);
+
+ mutex_lock(&state->lock);
+ s5pcsis_log_counters(state, true);
+ if (debug && (state->flags & ST_POWERED))
+ dump_regs(state, __func__);
+ mutex_unlock(&state->lock);
+ return 0;
+}
+
+static int s5pcsis_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+ struct v4l2_mbus_framefmt *format = v4l2_subdev_get_try_format(fh, 0);
+
+ format->colorspace = V4L2_COLORSPACE_JPEG;
+ format->code = s5pcsis_formats[0].code;
+ format->width = S5PCSIS_DEF_PIX_WIDTH;
+ format->height = S5PCSIS_DEF_PIX_HEIGHT;
+ format->field = V4L2_FIELD_NONE;
+
+ return 0;
+}
+
+static const struct v4l2_subdev_internal_ops s5pcsis_sd_internal_ops = {
+ .open = s5pcsis_open,
+};
+
+static struct v4l2_subdev_core_ops s5pcsis_core_ops = {
+ .s_power = s5pcsis_s_power,
+ .log_status = s5pcsis_log_status,
+};
+
+static struct v4l2_subdev_pad_ops s5pcsis_pad_ops = {
+ .enum_mbus_code = s5pcsis_enum_mbus_code,
+ .get_fmt = s5pcsis_get_fmt,
+ .set_fmt = s5pcsis_set_fmt,
+};
+
+static struct v4l2_subdev_video_ops s5pcsis_video_ops = {
+ .s_rx_buffer = s5pcsis_s_rx_buffer,
+ .s_stream = s5pcsis_s_stream,
+};
+
+static struct v4l2_subdev_ops s5pcsis_subdev_ops = {
+ .core = &s5pcsis_core_ops,
+ .pad = &s5pcsis_pad_ops,
+ .video = &s5pcsis_video_ops,
+};
+
+static irqreturn_t s5pcsis_irq_handler(int irq, void *dev_id)
+{
+ struct csis_state *state = dev_id;
+ struct csis_pktbuf *pktbuf = &state->pkt_buf;
+ unsigned long flags;
+ u32 status;
+
+ status = s5pcsis_read(state, S5PCSIS_INTSRC);
+ spin_lock_irqsave(&state->slock, flags);
+
+ if ((status & S5PCSIS_INTSRC_NON_IMAGE_DATA) && pktbuf->data) {
+ u32 offset;
+
+ if (status & S5PCSIS_INTSRC_EVEN)
+ offset = S5PCSIS_PKTDATA_EVEN;
+ else
+ offset = S5PCSIS_PKTDATA_ODD;
+
+ memcpy(pktbuf->data, state->regs + offset, pktbuf->len);
+ pktbuf->data = NULL;
+ rmb();
+ }
+
+ /* Update the event/error counters */
+ if ((status & S5PCSIS_INTSRC_ERRORS) || debug) {
+ int i;
+ for (i = 0; i < S5PCSIS_NUM_EVENTS; i++) {
+ if (!(status & state->events[i].mask))
+ continue;
+ state->events[i].counter++;
+ v4l2_dbg(2, debug, &state->sd, "%s: %d\n",
+ state->events[i].name,
+ state->events[i].counter);
+ }
+ v4l2_dbg(2, debug, &state->sd, "status: %08x\n", status);
+ }
+ spin_unlock_irqrestore(&state->slock, flags);
+
+ s5pcsis_write(state, S5PCSIS_INTSRC, status);
+ return IRQ_HANDLED;
+}
+
+static int s5pcsis_get_platform_data(struct platform_device *pdev,
+ struct csis_state *state)
+{
+ struct s5p_platform_mipi_csis *pdata = pdev->dev.platform_data;
+
+ if (pdata == NULL) {
+ dev_err(&pdev->dev, "Platform data not specified\n");
+ return -EINVAL;
+ }
+
+ state->clk_frequency = pdata->clk_rate;
+ state->num_lanes = pdata->lanes;
+ state->hs_settle = pdata->hs_settle;
+ state->index = max(0, pdev->id);
+ state->max_num_lanes = state->index ? CSIS1_MAX_LANES :
+ CSIS0_MAX_LANES;
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static int s5pcsis_parse_dt(struct platform_device *pdev,
+ struct csis_state *state)
+{
+ struct device_node *node = pdev->dev.of_node;
+ struct v4l2_of_endpoint endpoint;
+
+ if (of_property_read_u32(node, "clock-frequency",
+ &state->clk_frequency))
+ state->clk_frequency = DEFAULT_SCLK_CSIS_FREQ;
+ if (of_property_read_u32(node, "bus-width",
+ &state->max_num_lanes))
+ return -EINVAL;
+
+ node = v4l2_of_get_next_endpoint(node, NULL);
+ if (!node) {
+ dev_err(&pdev->dev, "No port node at %s\n",
+ node->full_name);
+ return -EINVAL;
+ }
+ /* Get port node and validate MIPI-CSI channel id. */
+ v4l2_of_parse_endpoint(node, &endpoint);
+
+ state->index = endpoint.port - FIMC_INPUT_MIPI_CSI2_0;
+ if (state->index < 0 || state->index >= CSIS_MAX_ENTITIES)
+ return -ENXIO;
+
+ /* Get MIPI CSI-2 bus configration from the endpoint node. */
+ of_property_read_u32(node, "samsung,csis-hs-settle",
+ &state->hs_settle);
+ state->wclk_ext = of_property_read_bool(node,
+ "samsung,csis-wclk");
+
+ state->num_lanes = endpoint.bus.mipi_csi2.num_data_lanes;
+
+ of_node_put(node);
+ return 0;
+}
+#else
+#define s5pcsis_parse_dt(pdev, state) (-ENOSYS)
+#endif
+
+static int s5pcsis_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *mem_res;
+ struct csis_state *state;
+ int ret = -ENOMEM;
+ int i;
+
+ state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
+ if (!state)
+ return -ENOMEM;
+
+ mutex_init(&state->lock);
+ spin_lock_init(&state->slock);
+ state->pdev = pdev;
+
+ if (dev->of_node)
+ ret = s5pcsis_parse_dt(pdev, state);
+ else
+ ret = s5pcsis_get_platform_data(pdev, state);
+ if (ret < 0)
+ return ret;
+
+ if (state->num_lanes == 0 || state->num_lanes > state->max_num_lanes) {
+ dev_err(dev, "Unsupported number of data lanes: %d (max. %d)\n",
+ state->num_lanes, state->max_num_lanes);
+ return -EINVAL;
+ }
+
+ mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ state->regs = devm_ioremap_resource(dev, mem_res);
+ if (IS_ERR(state->regs))
+ return PTR_ERR(state->regs);
+
+ state->irq = platform_get_irq(pdev, 0);
+ if (state->irq < 0) {
+ dev_err(dev, "Failed to get irq\n");
+ return state->irq;
+ }
+
+ for (i = 0; i < CSIS_NUM_SUPPLIES; i++)
+ state->supplies[i].supply = csis_supply_name[i];
+
+ ret = devm_regulator_bulk_get(dev, CSIS_NUM_SUPPLIES,
+ state->supplies);
+ if (ret)
+ return ret;
+
+ ret = s5pcsis_clk_get(state);
+ if (ret < 0)
+ return ret;
+
+ if (state->clk_frequency)
+ ret = clk_set_rate(state->clock[CSIS_CLK_MUX],
+ state->clk_frequency);
+ else
+ dev_WARN(dev, "No clock frequency specified!\n");
+ if (ret < 0)
+ goto e_clkput;
+
+ ret = clk_enable(state->clock[CSIS_CLK_MUX]);
+ if (ret < 0)
+ goto e_clkput;
+
+ ret = devm_request_irq(dev, state->irq, s5pcsis_irq_handler,
+ 0, dev_name(dev), state);
+ if (ret) {
+ dev_err(dev, "Interrupt request failed\n");
+ goto e_clkdis;
+ }
+
+ v4l2_subdev_init(&state->sd, &s5pcsis_subdev_ops);
+ state->sd.owner = THIS_MODULE;
+ snprintf(state->sd.name, sizeof(state->sd.name), "%s.%d",
+ CSIS_SUBDEV_NAME, state->index);
+ state->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+ state->csis_fmt = &s5pcsis_formats[0];
+
+ state->format.code = s5pcsis_formats[0].code;
+ state->format.width = S5PCSIS_DEF_PIX_WIDTH;
+ state->format.height = S5PCSIS_DEF_PIX_HEIGHT;
+
+ state->pads[CSIS_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
+ state->pads[CSIS_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
+ ret = media_entity_init(&state->sd.entity,
+ CSIS_PADS_NUM, state->pads, 0);
+ if (ret < 0)
+ goto e_clkdis;
+
+ /* This allows to retrieve the platform device id by the host driver */
+ v4l2_set_subdevdata(&state->sd, pdev);
+
+ /* .. and a pointer to the subdev. */
+ platform_set_drvdata(pdev, &state->sd);
+ memcpy(state->events, s5pcsis_events, sizeof(state->events));
+ pm_runtime_enable(dev);
+
+ dev_info(&pdev->dev, "lanes: %d, hs_settle: %d, wclk: %d, freq: %u\n",
+ state->num_lanes, state->hs_settle, state->wclk_ext,
+ state->clk_frequency);
+ return 0;
+
+e_clkdis:
+ clk_disable(state->clock[CSIS_CLK_MUX]);
+e_clkput:
+ s5pcsis_clk_put(state);
+ return ret;
+}
+
+static int s5pcsis_pm_suspend(struct device *dev, bool runtime)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct v4l2_subdev *sd = platform_get_drvdata(pdev);
+ struct csis_state *state = sd_to_csis_state(sd);
+ int ret = 0;
+
+ v4l2_dbg(1, debug, sd, "%s: flags: 0x%x\n",
+ __func__, state->flags);
+
+ mutex_lock(&state->lock);
+ if (state->flags & ST_POWERED) {
+ s5pcsis_stop_stream(state);
+ ret = s5p_csis_phy_enable(state->index, false);
+ if (ret)
+ goto unlock;
+ ret = regulator_bulk_disable(CSIS_NUM_SUPPLIES,
+ state->supplies);
+ if (ret)
+ goto unlock;
+ clk_disable(state->clock[CSIS_CLK_GATE]);
+ state->flags &= ~ST_POWERED;
+ if (!runtime)
+ state->flags |= ST_SUSPENDED;
+ }
+ unlock:
+ mutex_unlock(&state->lock);
+ return ret ? -EAGAIN : 0;
+}
+
+static int s5pcsis_pm_resume(struct device *dev, bool runtime)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct v4l2_subdev *sd = platform_get_drvdata(pdev);
+ struct csis_state *state = sd_to_csis_state(sd);
+ int ret = 0;
+
+ v4l2_dbg(1, debug, sd, "%s: flags: 0x%x\n",
+ __func__, state->flags);
+
+ mutex_lock(&state->lock);
+ if (!runtime && !(state->flags & ST_SUSPENDED))
+ goto unlock;
+
+ if (!(state->flags & ST_POWERED)) {
+ ret = regulator_bulk_enable(CSIS_NUM_SUPPLIES,
+ state->supplies);
+ if (ret)
+ goto unlock;
+ ret = s5p_csis_phy_enable(state->index, true);
+ if (!ret) {
+ state->flags |= ST_POWERED;
+ } else {
+ regulator_bulk_disable(CSIS_NUM_SUPPLIES,
+ state->supplies);
+ goto unlock;
+ }
+ clk_enable(state->clock[CSIS_CLK_GATE]);
+ }
+ if (state->flags & ST_STREAMING)
+ s5pcsis_start_stream(state);
+
+ state->flags &= ~ST_SUSPENDED;
+ unlock:
+ mutex_unlock(&state->lock);
+ return ret ? -EAGAIN : 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int s5pcsis_suspend(struct device *dev)
+{
+ return s5pcsis_pm_suspend(dev, false);
+}
+
+static int s5pcsis_resume(struct device *dev)
+{
+ return s5pcsis_pm_resume(dev, false);
+}
+#endif
+
+#ifdef CONFIG_PM_RUNTIME
+static int s5pcsis_runtime_suspend(struct device *dev)
+{
+ return s5pcsis_pm_suspend(dev, true);
+}
+
+static int s5pcsis_runtime_resume(struct device *dev)
+{
+ return s5pcsis_pm_resume(dev, true);
+}
+#endif
+
+static int s5pcsis_remove(struct platform_device *pdev)
+{
+ struct v4l2_subdev *sd = platform_get_drvdata(pdev);
+ struct csis_state *state = sd_to_csis_state(sd);
+
+ pm_runtime_disable(&pdev->dev);
+ s5pcsis_pm_suspend(&pdev->dev, false);
+ clk_disable(state->clock[CSIS_CLK_MUX]);
+ pm_runtime_set_suspended(&pdev->dev);
+ s5pcsis_clk_put(state);
+
+ media_entity_cleanup(&state->sd.entity);
+
+ return 0;
+}
+
+static const struct dev_pm_ops s5pcsis_pm_ops = {
+ SET_RUNTIME_PM_OPS(s5pcsis_runtime_suspend, s5pcsis_runtime_resume,
+ NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(s5pcsis_suspend, s5pcsis_resume)
+};
+
+static const struct of_device_id s5pcsis_of_match[] = {
+ { .compatible = "samsung,s5pv210-csis" },
+ { .compatible = "samsung,exynos4210-csis" },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, s5pcsis_of_match);
+
+static struct platform_driver s5pcsis_driver = {
+ .probe = s5pcsis_probe,
+ .remove = s5pcsis_remove,
+ .driver = {
+ .of_match_table = s5pcsis_of_match,
+ .name = CSIS_DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .pm = &s5pcsis_pm_ops,
+ },
+};
+
+module_platform_driver(s5pcsis_driver);
+
+MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
+MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC MIPI-CSI2 receiver driver");
+MODULE_LICENSE("GPL");