--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * TC358746 - Parallel <-> CSI-2 Bridge
+ *
+ * Copyright 2022 Marco Felsch <kernel@pengutronix.de>
+ *
+ * Notes:
+ * - Currently only 'Parallel-in -> CSI-out' mode is supported!
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/phy/phy-mipi-dphy.h>
+#include <linux/property.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/units.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-mc.h>
+
+/* 16-bit registers */
+#define CHIPID_REG 0x0000
+#define CHIPID GENMASK(15, 8)
+
+#define SYSCTL_REG 0x0002
+#define SRESET BIT(0)
+
+#define CONFCTL_REG 0x0004
+#define PDATAF_MASK GENMASK(9, 8)
+#define PDATAF_MODE0 0
+#define PDATAF_MODE1 1
+#define PDATAF_MODE2 2
+#define PDATAF(val) FIELD_PREP(PDATAF_MASK, (val))
+#define PPEN BIT(6)
+#define DATALANE_MASK GENMASK(1, 0)
+
+#define FIFOCTL_REG 0x0006
+#define DATAFMT_REG 0x0008
+#define PDFMT(val) FIELD_PREP(GENMASK(7, 4), (val))
+
+#define MCLKCTL_REG 0x000c
+#define MCLK_HIGH_MASK GENMASK(15, 8)
+#define MCLK_LOW_MASK GENMASK(7, 0)
+#define MCLK_HIGH(val) FIELD_PREP(MCLK_HIGH_MASK, (val))
+#define MCLK_LOW(val) FIELD_PREP(MCLK_LOW_MASK, (val))
+
+#define PLLCTL0_REG 0x0016
+#define PLL_PRD_MASK GENMASK(15, 12)
+#define PLL_PRD(val) FIELD_PREP(PLL_PRD_MASK, (val))
+#define PLL_FBD_MASK GENMASK(8, 0)
+#define PLL_FBD(val) FIELD_PREP(PLL_FBD_MASK, (val))
+
+#define PLLCTL1_REG 0x0018
+#define PLL_FRS_MASK GENMASK(11, 10)
+#define PLL_FRS(val) FIELD_PREP(PLL_FRS_MASK, (val))
+#define CKEN BIT(4)
+#define RESETB BIT(1)
+#define PLL_EN BIT(0)
+
+#define CLKCTL_REG 0x0020
+#define MCLKDIV_MASK GENMASK(3, 2)
+#define MCLKDIV(val) FIELD_PREP(MCLKDIV_MASK, (val))
+#define MCLKDIV_8 0
+#define MCLKDIV_4 1
+#define MCLKDIV_2 2
+
+#define WORDCNT_REG 0x0022
+#define PP_MISC_REG 0x0032
+#define FRMSTOP BIT(15)
+#define RSTPTR BIT(14)
+
+/* 32-bit registers */
+#define CLW_DPHYCONTTX_REG 0x0100
+#define CLW_CNTRL_REG 0x0140
+#define D0W_CNTRL_REG 0x0144
+#define LANEDISABLE BIT(0)
+
+#define STARTCNTRL_REG 0x0204
+#define START BIT(0)
+
+#define LINEINITCNT_REG 0x0210
+#define LPTXTIMECNT_REG 0x0214
+#define TCLK_HEADERCNT_REG 0x0218
+#define TCLK_ZEROCNT(val) FIELD_PREP(GENMASK(15, 8), (val))
+#define TCLK_PREPARECNT(val) FIELD_PREP(GENMASK(6, 0), (val))
+
+#define TCLK_TRAILCNT_REG 0x021C
+#define THS_HEADERCNT_REG 0x0220
+#define THS_ZEROCNT(val) FIELD_PREP(GENMASK(14, 8), (val))
+#define THS_PREPARECNT(val) FIELD_PREP(GENMASK(6, 0), (val))
+
+#define TWAKEUP_REG 0x0224
+#define TCLK_POSTCNT_REG 0x0228
+#define THS_TRAILCNT_REG 0x022C
+#define HSTXVREGEN_REG 0x0234
+#define TXOPTIONCNTRL_REG 0x0238
+#define CSI_CONTROL_REG 0x040C
+#define CSI_MODE BIT(15)
+#define TXHSMD BIT(7)
+#define NOL(val) FIELD_PREP(GENMASK(2, 1), (val))
+
+#define CSI_CONFW_REG 0x0500
+#define MODE(val) FIELD_PREP(GENMASK(31, 29), (val))
+#define MODE_SET 0x5
+#define ADDRESS(val) FIELD_PREP(GENMASK(28, 24), (val))
+#define CSI_CONTROL_ADDRESS 0x3
+#define DATA(val) FIELD_PREP(GENMASK(15, 0), (val))
+
+#define CSI_START_REG 0x0518
+#define STRT BIT(0)
+
+static const struct v4l2_mbus_framefmt tc358746_def_fmt = {
+ .width = 640,
+ .height = 480,
+ .code = MEDIA_BUS_FMT_UYVY8_2X8,
+ .field = V4L2_FIELD_NONE,
+ .colorspace = V4L2_COLORSPACE_DEFAULT,
+ .ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT,
+ .quantization = V4L2_QUANTIZATION_DEFAULT,
+ .xfer_func = V4L2_XFER_FUNC_DEFAULT,
+};
+
+static const char * const tc358746_supplies[] = {
+ "vddc", "vddio", "vddmipi"
+};
+
+enum {
+ TC358746_SINK,
+ TC358746_SOURCE,
+ TC358746_NR_PADS
+};
+
+struct tc358746 {
+ struct v4l2_subdev sd;
+ struct media_pad pads[TC358746_NR_PADS];
+ struct v4l2_async_notifier notifier;
+ struct v4l2_fwnode_endpoint csi_vep;
+
+ struct v4l2_ctrl_handler ctrl_hdl;
+
+ struct regmap *regmap;
+ struct clk *refclk;
+ struct gpio_desc *reset_gpio;
+ struct regulator_bulk_data supplies[ARRAY_SIZE(tc358746_supplies)];
+
+ struct clk_hw mclk_hw;
+ unsigned long mclk_rate;
+ u8 mclk_prediv;
+ u16 mclk_postdiv;
+
+ unsigned long pll_rate;
+ u8 pll_post_div;
+ u16 pll_pre_div;
+ u16 pll_mul;
+
+#define TC358746_VB_MAX_SIZE (511 * 32)
+#define TC358746_VB_DEFAULT_SIZE (1 * 32)
+ unsigned int vb_size; /* Video buffer size in bits */
+
+ struct phy_configure_opts_mipi_dphy dphy_cfg;
+};
+
+static inline struct tc358746 *to_tc358746(struct v4l2_subdev *sd)
+{
+ return container_of(sd, struct tc358746, sd);
+}
+
+static inline struct tc358746 *clk_hw_to_tc358746(struct clk_hw *hw)
+{
+ return container_of(hw, struct tc358746, mclk_hw);
+}
+
+struct tc358746_format {
+ u32 code;
+ bool csi_format;
+ unsigned char bus_width;
+ unsigned char bpp;
+ /* Register values */
+ u8 pdformat; /* Peripheral Data Format */
+ u8 pdataf; /* Parallel Data Format Option */
+};
+
+enum {
+ PDFORMAT_RAW8 = 0,
+ PDFORMAT_RAW10,
+ PDFORMAT_RAW12,
+ PDFORMAT_RGB888,
+ PDFORMAT_RGB666,
+ PDFORMAT_RGB565,
+ PDFORMAT_YUV422_8BIT,
+ /* RESERVED = 7 */
+ PDFORMAT_RAW14 = 8,
+ PDFORMAT_YUV422_10BIT,
+ PDFORMAT_YUV444,
+};
+
+/* Check tc358746_src_mbus_code() if you add new formats */
+static const struct tc358746_format tc358746_formats[] = {
+ {
+ .code = MEDIA_BUS_FMT_UYVY8_2X8,
+ .bus_width = 8,
+ .bpp = 16,
+ .pdformat = PDFORMAT_YUV422_8BIT,
+ .pdataf = PDATAF_MODE0,
+ }, {
+ .code = MEDIA_BUS_FMT_UYVY8_1X16,
+ .csi_format = true,
+ .bus_width = 16,
+ .bpp = 16,
+ .pdformat = PDFORMAT_YUV422_8BIT,
+ .pdataf = PDATAF_MODE1,
+ }, {
+ .code = MEDIA_BUS_FMT_YUYV8_1X16,
+ .csi_format = true,
+ .bus_width = 16,
+ .bpp = 16,
+ .pdformat = PDFORMAT_YUV422_8BIT,
+ .pdataf = PDATAF_MODE2,
+ }, {
+ .code = MEDIA_BUS_FMT_UYVY10_2X10,
+ .bus_width = 10,
+ .bpp = 20,
+ .pdformat = PDFORMAT_YUV422_10BIT,
+ .pdataf = PDATAF_MODE0, /* don't care */
+ }
+};
+
+/* Get n-th format for pad */
+static const struct tc358746_format *
+tc358746_get_format_by_idx(unsigned int pad, unsigned int index)
+{
+ unsigned int idx = 0;
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(tc358746_formats); i++) {
+ const struct tc358746_format *fmt = &tc358746_formats[i];
+
+ if ((pad == TC358746_SOURCE && fmt->csi_format) ||
+ (pad == TC358746_SINK)) {
+ if (idx == index)
+ return fmt;
+ idx++;
+ }
+ }
+
+ return ERR_PTR(-EINVAL);
+}
+
+static const struct tc358746_format *
+tc358746_get_format_by_code(unsigned int pad, u32 code)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(tc358746_formats); i++) {
+ const struct tc358746_format *fmt = &tc358746_formats[i];
+
+ if (pad == TC358746_SINK && fmt->code == code)
+ return fmt;
+
+ if (pad == TC358746_SOURCE && !fmt->csi_format)
+ continue;
+
+ if (fmt->code == code)
+ return fmt;
+ }
+
+ return ERR_PTR(-EINVAL);
+}
+
+static u32 tc358746_src_mbus_code(u32 code)
+{
+ switch (code) {
+ case MEDIA_BUS_FMT_UYVY8_2X8:
+ return MEDIA_BUS_FMT_UYVY8_1X16;
+ case MEDIA_BUS_FMT_UYVY10_2X10:
+ return MEDIA_BUS_FMT_UYVY10_1X20;
+ default:
+ return code;
+ }
+}
+
+static bool tc358746_valid_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case CHIPID_REG ... CSI_START_REG:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config tc358746_regmap_config = {
+ .name = "tc358746",
+ .reg_bits = 16,
+ .val_bits = 16,
+ .max_register = CSI_START_REG,
+ .writeable_reg = tc358746_valid_reg,
+ .readable_reg = tc358746_valid_reg,
+ .reg_format_endian = REGMAP_ENDIAN_BIG,
+ .val_format_endian = REGMAP_ENDIAN_BIG,
+};
+
+static int tc358746_write(struct tc358746 *tc358746, u32 reg, u32 val)
+{
+ size_t count;
+ int err;
+
+ /* 32-bit registers starting from CLW_DPHYCONTTX */
+ count = reg < CLW_DPHYCONTTX_REG ? 1 : 2;
+
+ err = regmap_bulk_write(tc358746->regmap, reg, &val, count);
+ if (err)
+ dev_err(tc358746->sd.dev,
+ "Failed to write reg:0x%04x err:%d\n", reg, err);
+
+ return err;
+}
+
+static int tc358746_read(struct tc358746 *tc358746, u32 reg, u32 *val)
+{
+ size_t count;
+ int err;
+
+ /* 32-bit registers starting from CLW_DPHYCONTTX */
+ count = reg < CLW_DPHYCONTTX_REG ? 1 : 2;
+ *val = 0;
+
+ err = regmap_bulk_read(tc358746->regmap, reg, val, count);
+ if (err)
+ dev_err(tc358746->sd.dev,
+ "Failed to read reg:0x%04x err:%d\n", reg, err);
+
+ return err;
+}
+
+static int
+tc358746_update_bits(struct tc358746 *tc358746, u32 reg, u32 mask, u32 val)
+{
+ u32 tmp, orig;
+ int err;
+
+ err = tc358746_read(tc358746, reg, &orig);
+ if (err)
+ return err;
+
+ tmp = orig & ~mask;
+ tmp |= val & mask;
+
+ return tc358746_write(tc358746, reg, tmp);
+}
+
+static int tc358746_set_bits(struct tc358746 *tc358746, u32 reg, u32 bits)
+{
+ return tc358746_update_bits(tc358746, reg, bits, bits);
+}
+
+static int tc358746_clear_bits(struct tc358746 *tc358746, u32 reg, u32 bits)
+{
+ return tc358746_update_bits(tc358746, reg, bits, 0);
+}
+
+static int tc358746_sw_reset(struct tc358746 *tc358746)
+{
+ int err;
+
+ err = tc358746_set_bits(tc358746, SYSCTL_REG, SRESET);
+ if (err)
+ return err;
+
+ fsleep(10);
+
+ return tc358746_clear_bits(tc358746, SYSCTL_REG, SRESET);
+}
+
+static int
+tc358746_apply_pll_config(struct tc358746 *tc358746)
+{
+ u8 post = tc358746->pll_post_div;
+ u16 pre = tc358746->pll_pre_div;
+ u16 mul = tc358746->pll_mul;
+ u32 val, mask;
+ int err;
+
+ err = tc358746_read(tc358746, PLLCTL1_REG, &val);
+ if (err)
+ return err;
+
+ /* Don't touch the PLL if running */
+ if (FIELD_GET(PLL_EN, val) == 1)
+ return 0;
+
+ /* Pre-div and Multiplicator have a internal +1 logic */
+ val = PLL_PRD(pre - 1) | PLL_FBD(mul - 1);
+ mask = PLL_PRD_MASK | PLL_FBD_MASK;
+ err = tc358746_update_bits(tc358746, PLLCTL0_REG, mask, val);
+ if (err)
+ return err;
+
+ val = PLL_FRS(ilog2(post)) | RESETB | PLL_EN;
+ mask = PLL_FRS_MASK | RESETB | PLL_EN;
+ tc358746_update_bits(tc358746, PLLCTL1_REG, mask, val);
+ if (err)
+ return err;
+
+ fsleep(1000);
+
+ return tc358746_set_bits(tc358746, PLLCTL1_REG, CKEN);
+}
+
+static int tc358746_apply_misc_config(struct tc358746 *tc358746)
+{
+ const struct v4l2_mbus_framefmt *mbusfmt;
+ struct v4l2_subdev *sd = &tc358746->sd;
+ struct v4l2_subdev_state *sink_state;
+ const struct tc358746_format *fmt;
+ struct device *dev = sd->dev;
+ u32 val;
+ int err;
+
+ sink_state = v4l2_subdev_lock_and_get_active_state(sd);
+
+ mbusfmt = v4l2_subdev_get_pad_format(sd, sink_state, TC358746_SINK);
+ fmt = tc358746_get_format_by_code(TC358746_SINK, mbusfmt->code);
+
+ /* Self defined CSI user data type id's are not supported yet */
+ val = PDFMT(fmt->pdformat);
+ dev_dbg(dev, "DATAFMT: 0x%x\n", val);
+ err = tc358746_write(tc358746, DATAFMT_REG, val);
+ if (err)
+ goto out;
+
+ val = PDATAF(fmt->pdataf);
+ dev_dbg(dev, "CONFCTL[PDATAF]: 0x%x\n", fmt->pdataf);
+ err = tc358746_update_bits(tc358746, CONFCTL_REG, PDATAF_MASK, val);
+ if (err)
+ goto out;
+
+ val = tc358746->vb_size / 32;
+ dev_dbg(dev, "FIFOCTL: %u (0x%x)\n", val, val);
+ err = tc358746_write(tc358746, FIFOCTL_REG, val);
+ if (err)
+ goto out;
+
+ /* Total number of bytes for each line/width */
+ val = mbusfmt->width * fmt->bpp / 8;
+ dev_dbg(dev, "WORDCNT: %u (0x%x)\n", val, val);
+ err = tc358746_write(tc358746, WORDCNT_REG, val);
+
+out:
+ v4l2_subdev_unlock_state(sink_state);
+
+ return err;
+}
+
+/* Use MHz as base so the div needs no u64 */
+static u32 tc358746_cfg_to_cnt(unsigned int cfg_val,
+ unsigned int clk_mhz,
+ unsigned int time_base)
+{
+ return DIV_ROUND_UP(cfg_val * clk_mhz, time_base);
+}
+
+static u32 tc358746_ps_to_cnt(unsigned int cfg_val,
+ unsigned int clk_mhz)
+{
+ return tc358746_cfg_to_cnt(cfg_val, clk_mhz, USEC_PER_SEC);
+}
+
+static u32 tc358746_us_to_cnt(unsigned int cfg_val,
+ unsigned int clk_mhz)
+{
+ return tc358746_cfg_to_cnt(cfg_val, clk_mhz, 1);
+}
+
+static int tc358746_apply_dphy_config(struct tc358746 *tc358746)
+{
+ struct phy_configure_opts_mipi_dphy *cfg = &tc358746->dphy_cfg;
+ bool non_cont_clk = !!(tc358746->csi_vep.bus.mipi_csi2.flags &
+ V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK);
+ struct device *dev = tc358746->sd.dev;
+ unsigned long hs_byte_clk, hf_clk;
+ u32 val, val2, lptxcnt;
+ int err;
+
+ /* The hs_byte_clk is also called SYSCLK in the excel sheet */
+ hs_byte_clk = cfg->hs_clk_rate / 8;
+ hs_byte_clk /= HZ_PER_MHZ;
+ hf_clk = hs_byte_clk / 2;
+
+ val = tc358746_us_to_cnt(cfg->init, hf_clk) - 1;
+ dev_dbg(dev, "LINEINITCNT: %u (0x%x)\n", val, val);
+ err = tc358746_write(tc358746, LINEINITCNT_REG, val);
+ if (err)
+ return err;
+
+ val = tc358746_ps_to_cnt(cfg->lpx, hs_byte_clk) - 1;
+ lptxcnt = val;
+ dev_dbg(dev, "LPTXTIMECNT: %u (0x%x)\n", val, val);
+ err = tc358746_write(tc358746, LPTXTIMECNT_REG, val);
+ if (err)
+ return err;
+
+ val = tc358746_ps_to_cnt(cfg->clk_prepare, hs_byte_clk) - 1;
+ val2 = tc358746_ps_to_cnt(cfg->clk_zero, hs_byte_clk) - 1;
+ dev_dbg(dev, "TCLK_PREPARECNT: %u (0x%x)\n", val, val);
+ dev_dbg(dev, "TCLK_ZEROCNT: %u (0x%x)\n", val2, val2);
+ dev_dbg(dev, "TCLK_HEADERCNT: 0x%x\n",
+ (u32)(TCLK_PREPARECNT(val) | TCLK_ZEROCNT(val2)));
+ err = tc358746_write(tc358746, TCLK_HEADERCNT_REG,
+ TCLK_PREPARECNT(val) | TCLK_ZEROCNT(val2));
+ if (err)
+ return err;
+
+ val = tc358746_ps_to_cnt(cfg->clk_trail, hs_byte_clk);
+ dev_dbg(dev, "TCLK_TRAILCNT: %u (0x%x)\n", val, val);
+ err = tc358746_write(tc358746, TCLK_TRAILCNT_REG, val);
+ if (err)
+ return err;
+
+ val = tc358746_ps_to_cnt(cfg->hs_prepare, hs_byte_clk) - 1;
+ val2 = tc358746_ps_to_cnt(cfg->hs_zero, hs_byte_clk) - 1;
+ dev_dbg(dev, "THS_PREPARECNT: %u (0x%x)\n", val, val);
+ dev_dbg(dev, "THS_ZEROCNT: %u (0x%x)\n", val2, val2);
+ dev_dbg(dev, "THS_HEADERCNT: 0x%x\n",
+ (u32)(THS_PREPARECNT(val) | THS_ZEROCNT(val2)));
+ err = tc358746_write(tc358746, THS_HEADERCNT_REG,
+ THS_PREPARECNT(val) | THS_ZEROCNT(val2));
+ if (err)
+ return err;
+
+ /* TWAKEUP > 1ms in lptxcnt steps */
+ val = tc358746_us_to_cnt(cfg->wakeup, hs_byte_clk);
+ val = val / (lptxcnt + 1) - 1;
+ dev_dbg(dev, "TWAKEUP: %u (0x%x)\n", val, val);
+ err = tc358746_write(tc358746, TWAKEUP_REG, val);
+ if (err)
+ return err;
+
+ val = tc358746_ps_to_cnt(cfg->clk_post, hs_byte_clk);
+ dev_dbg(dev, "TCLK_POSTCNT: %u (0x%x)\n", val, val);
+ err = tc358746_write(tc358746, TCLK_POSTCNT_REG, val);
+ if (err)
+ return err;
+
+ val = tc358746_ps_to_cnt(cfg->hs_trail, hs_byte_clk);
+ dev_dbg(dev, "THS_TRAILCNT: %u (0x%x)\n", val, val);
+ err = tc358746_write(tc358746, THS_TRAILCNT_REG, val);
+ if (err)
+ return err;
+
+ dev_dbg(dev, "CONTCLKMODE: %u", non_cont_clk ? 0 : 1);
+
+ return tc358746_write(tc358746, TXOPTIONCNTRL_REG, non_cont_clk ? 0 : 1);
+}
+
+#define MAX_DATA_LANES 4
+
+static int tc358746_enable_csi_lanes(struct tc358746 *tc358746, int enable)
+{
+ unsigned int lanes = tc358746->dphy_cfg.lanes;
+ unsigned int lane;
+ u32 reg, val;
+ int err;
+
+ err = tc358746_update_bits(tc358746, CONFCTL_REG, DATALANE_MASK,
+ lanes - 1);
+ if (err)
+ return err;
+
+ /* Clock lane */
+ val = enable ? 0 : LANEDISABLE;
+ dev_dbg(tc358746->sd.dev, "CLW_CNTRL: 0x%x\n", val);
+ err = tc358746_write(tc358746, CLW_CNTRL_REG, val);
+ if (err)
+ return err;
+
+ for (lane = 0; lane < MAX_DATA_LANES; lane++) {
+ /* Data lanes */
+ reg = D0W_CNTRL_REG + lane * 0x4;
+ val = (enable && lane < lanes) ? 0 : LANEDISABLE;
+
+ dev_dbg(tc358746->sd.dev, "D%uW_CNTRL: 0x%x\n", lane, val);
+ err = tc358746_write(tc358746, reg, val);
+ if (err)
+ return err;
+ }
+
+ val = 0;
+ if (enable) {
+ /* Clock lane */
+ val |= BIT(0);
+
+ /* Data lanes */
+ for (lane = 1; lane <= lanes; lane++)
+ val |= BIT(lane);
+ }
+
+ dev_dbg(tc358746->sd.dev, "HSTXVREGEN: 0x%x\n", val);
+
+ return tc358746_write(tc358746, HSTXVREGEN_REG, val);
+}
+
+static int tc358746_enable_csi_module(struct tc358746 *tc358746, int enable)
+{
+ unsigned int lanes = tc358746->dphy_cfg.lanes;
+ int err;
+
+ /*
+ * START and STRT are only reseted/disabled by sw reset. This is
+ * required to put the lane state back into LP-11 state. The sw reset
+ * don't reset register values.
+ */
+ if (!enable)
+ return tc358746_sw_reset(tc358746);
+
+ err = tc358746_write(tc358746, STARTCNTRL_REG, START);
+ if (err)
+ return err;
+
+ err = tc358746_write(tc358746, CSI_START_REG, STRT);
+ if (err)
+ return err;
+
+ /* CSI_CONTROL_REG is only indirect accessible */
+ return tc358746_write(tc358746, CSI_CONFW_REG,
+ MODE(MODE_SET) |
+ ADDRESS(CSI_CONTROL_ADDRESS) |
+ DATA(CSI_MODE | TXHSMD | NOL(lanes - 1)));
+}
+
+static int tc358746_enable_parallel_port(struct tc358746 *tc358746, int enable)
+{
+ int err;
+
+ if (enable) {
+ err = tc358746_write(tc358746, PP_MISC_REG, 0);
+ if (err)
+ return err;
+
+ return tc358746_set_bits(tc358746, CONFCTL_REG, PPEN);
+ }
+
+ err = tc358746_set_bits(tc358746, PP_MISC_REG, FRMSTOP);
+ if (err)
+ return err;
+
+ err = tc358746_clear_bits(tc358746, CONFCTL_REG, PPEN);
+ if (err)
+ return err;
+
+ return tc358746_set_bits(tc358746, PP_MISC_REG, RSTPTR);
+}
+
+static inline struct v4l2_subdev *tc358746_get_remote_sd(struct media_pad *pad)
+{
+ pad = media_pad_remote_pad_first(pad);
+ if (!pad)
+ return NULL;
+
+ return media_entity_to_v4l2_subdev(pad->entity);
+}
+
+static int tc358746_s_stream(struct v4l2_subdev *sd, int enable)
+{
+ struct tc358746 *tc358746 = to_tc358746(sd);
+ struct v4l2_subdev *src;
+ int err;
+
+ dev_dbg(sd->dev, "%sable\n", enable ? "en" : "dis");
+
+ src = tc358746_get_remote_sd(&tc358746->pads[TC358746_SINK]);
+ if (!src)
+ return -EPIPE;
+
+ if (enable) {
+ err = pm_runtime_resume_and_get(sd->dev);
+ if (err)
+ return err;
+
+ err = tc358746_apply_dphy_config(tc358746);
+ if (err)
+ goto err_out;
+
+ err = tc358746_apply_misc_config(tc358746);
+ if (err)
+ goto err_out;
+
+ err = tc358746_enable_csi_lanes(tc358746, 1);
+ if (err)
+ goto err_out;
+
+ err = tc358746_enable_csi_module(tc358746, 1);
+ if (err)
+ goto err_out;
+
+ err = tc358746_enable_parallel_port(tc358746, 1);
+ if (err)
+ goto err_out;
+
+ err = v4l2_subdev_call(src, video, s_stream, 1);
+ if (err)
+ goto err_out;
+
+ return 0;
+
+err_out:
+ pm_runtime_mark_last_busy(sd->dev);
+ pm_runtime_put_sync_autosuspend(sd->dev);
+
+ return err;
+ }
+
+ /*
+ * The lanes must be disabled first (before the csi module) so the
+ * LP-11 state is entered correctly.
+ */
+ err = tc358746_enable_csi_lanes(tc358746, 0);
+ if (err)
+ return err;
+
+ err = tc358746_enable_csi_module(tc358746, 0);
+ if (err)
+ return err;
+
+ err = tc358746_enable_parallel_port(tc358746, 0);
+ if (err)
+ return err;
+
+ pm_runtime_mark_last_busy(sd->dev);
+ pm_runtime_put_sync_autosuspend(sd->dev);
+
+ return v4l2_subdev_call(src, video, s_stream, 0);
+}
+
+static int tc358746_init_cfg(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *state)
+{
+ struct v4l2_mbus_framefmt *fmt;
+
+ fmt = v4l2_subdev_get_pad_format(sd, state, TC358746_SINK);
+ *fmt = tc358746_def_fmt;
+
+ fmt = v4l2_subdev_get_pad_format(sd, state, TC358746_SOURCE);
+ *fmt = tc358746_def_fmt;
+ fmt->code = tc358746_src_mbus_code(tc358746_def_fmt.code);
+
+ return 0;
+}
+
+static int tc358746_enum_mbus_code(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *sd_state,
+ struct v4l2_subdev_mbus_code_enum *code)
+{
+ const struct tc358746_format *fmt;
+
+ fmt = tc358746_get_format_by_idx(code->pad, code->index);
+ if (IS_ERR(fmt))
+ return PTR_ERR(fmt);
+
+ code->code = fmt->code;
+
+ return 0;
+}
+
+static int tc358746_set_fmt(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *sd_state,
+ struct v4l2_subdev_format *format)
+{
+ struct v4l2_mbus_framefmt *src_fmt, *sink_fmt;
+ const struct tc358746_format *fmt;
+
+ /* Source follows the sink */
+ if (format->pad == TC358746_SOURCE)
+ return v4l2_subdev_get_fmt(sd, sd_state, format);
+
+ sink_fmt = v4l2_subdev_get_pad_format(sd, sd_state, TC358746_SINK);
+
+ fmt = tc358746_get_format_by_code(format->pad, format->format.code);
+ if (IS_ERR(fmt))
+ fmt = tc358746_get_format_by_code(format->pad, tc358746_def_fmt.code);
+
+ format->format.code = fmt->code;
+ format->format.field = V4L2_FIELD_NONE;
+
+ dev_dbg(sd->dev, "Update format: %ux%u code:0x%x -> %ux%u code:0x%x",
+ sink_fmt->width, sink_fmt->height, sink_fmt->code,
+ format->format.width, format->format.height, format->format.code);
+
+ *sink_fmt = format->format;
+
+ src_fmt = v4l2_subdev_get_pad_format(sd, sd_state, TC358746_SOURCE);
+ *src_fmt = *sink_fmt;
+ src_fmt->code = tc358746_src_mbus_code(sink_fmt->code);
+
+ return 0;
+}
+
+static unsigned long tc358746_find_pll_settings(struct tc358746 *tc358746,
+ unsigned long refclk,
+ unsigned long fout)
+
+{
+ struct device *dev = tc358746->sd.dev;
+ unsigned long best_freq = 0;
+ u32 min_delta = 0xffffffff;
+ u16 prediv_max = 17;
+ u16 prediv_min = 1;
+ u16 m_best, mul;
+ u16 p_best, p;
+ u8 postdiv;
+
+ if (fout > 1000 * HZ_PER_MHZ) {
+ dev_err(dev, "HS-Clock above 1 Ghz are not supported\n");
+ return 0;
+ }
+
+ if (fout >= 500 * HZ_PER_MHZ)
+ postdiv = 1;
+ else if (fout >= 250 * HZ_PER_MHZ)
+ postdiv = 2;
+ else if (fout >= 125 * HZ_PER_MHZ)
+ postdiv = 4;
+ else
+ postdiv = 8;
+
+ for (p = prediv_min; p <= prediv_max; p++) {
+ unsigned long delta, fin;
+ u64 tmp;
+
+ fin = DIV_ROUND_CLOSEST(refclk, p);
+ if (fin < 4 * HZ_PER_MHZ || fin > 40 * HZ_PER_MHZ)
+ continue;
+
+ tmp = fout * p * postdiv;
+ do_div(tmp, fin);
+ mul = tmp;
+ if (mul > 511)
+ continue;
+
+ tmp = mul * fin;
+ do_div(tmp, p * postdiv);
+
+ delta = abs(fout - tmp);
+ if (delta < min_delta) {
+ p_best = p;
+ m_best = mul;
+ min_delta = delta;
+ best_freq = tmp;
+ };
+
+ if (delta == 0)
+ break;
+ };
+
+ if (!best_freq) {
+ dev_err(dev, "Failed find PLL frequency\n");
+ return 0;
+ }
+
+ tc358746->pll_post_div = postdiv;
+ tc358746->pll_pre_div = p_best;
+ tc358746->pll_mul = m_best;
+
+ if (best_freq != fout)
+ dev_warn(dev, "Request PLL freq:%lu, found PLL freq:%lu\n",
+ fout, best_freq);
+
+ dev_dbg(dev, "Found PLL settings: freq:%lu prediv:%u multi:%u postdiv:%u\n",
+ best_freq, p_best, m_best, postdiv);
+
+ return best_freq;
+}
+
+#define TC358746_PRECISION 10
+
+static int
+tc358746_link_validate(struct v4l2_subdev *sd, struct media_link *link,
+ struct v4l2_subdev_format *source_fmt,
+ struct v4l2_subdev_format *sink_fmt)
+{
+ struct tc358746 *tc358746 = to_tc358746(sd);
+ unsigned long csi_bitrate, source_bitrate;
+ struct v4l2_subdev_state *sink_state;
+ struct v4l2_mbus_framefmt *mbusfmt;
+ const struct tc358746_format *fmt;
+ unsigned int fifo_sz, tmp, n;
+ struct v4l2_subdev *source;
+ s64 source_link_freq;
+ int err;
+
+ err = v4l2_subdev_link_validate_default(sd, link, source_fmt, sink_fmt);
+ if (err)
+ return err;
+
+ sink_state = v4l2_subdev_lock_and_get_active_state(sd);
+ mbusfmt = v4l2_subdev_get_pad_format(sd, sink_state, TC358746_SINK);
+
+ /* Check the FIFO settings */
+ fmt = tc358746_get_format_by_code(TC358746_SINK, mbusfmt->code);
+
+ source = media_entity_to_v4l2_subdev(link->source->entity);
+ source_link_freq = v4l2_get_link_freq(source->ctrl_handler, 0, 0);
+ if (source_link_freq <= 0) {
+ dev_err(tc358746->sd.dev,
+ "Failed to query or invalid source link frequency\n");
+ v4l2_subdev_unlock_state(sink_state);
+ /* Return -EINVAL in case of source_link_freq is 0 */
+ return source_link_freq ? : -EINVAL;
+ }
+ source_bitrate = source_link_freq * fmt->bus_width;
+
+ csi_bitrate = tc358746->dphy_cfg.lanes * tc358746->pll_rate;
+
+ dev_dbg(tc358746->sd.dev,
+ "Fifo settings params: source-bitrate:%lu csi-bitrate:%lu",
+ source_bitrate, csi_bitrate);
+
+ /* Avoid possible FIFO overflows */
+ if (csi_bitrate < source_bitrate) {
+ v4l2_subdev_unlock_state(sink_state);
+ return -EINVAL;
+ }
+
+ /* Best case */
+ if (csi_bitrate == source_bitrate) {
+ fifo_sz = TC358746_VB_DEFAULT_SIZE;
+ tc358746->vb_size = TC358746_VB_DEFAULT_SIZE;
+ goto out;
+ }
+
+ /*
+ * Avoid possible FIFO underflow in case of
+ * csi_bitrate > source_bitrate. For such case the chip has a internal
+ * fifo which can be used to delay the line output.
+ *
+ * Fifo size calculation (excluding precision):
+ *
+ * fifo-sz, image-width - in bits
+ * sbr - source_bitrate in bits/s
+ * csir - csi_bitrate in bits/s
+ *
+ * image-width / csir >= (image-width - fifo-sz) / sbr
+ * image-width * sbr / csir >= image-width - fifo-sz
+ * fifo-sz >= image-width - image-width * sbr / csir; with n = csir/sbr
+ * fifo-sz >= image-width - image-width / n
+ */
+
+ source_bitrate /= TC358746_PRECISION;
+ n = csi_bitrate / source_bitrate;
+ tmp = (mbusfmt->width * TC358746_PRECISION) / n;
+ fifo_sz = mbusfmt->width - tmp;
+ fifo_sz *= fmt->bpp;
+ tc358746->vb_size = round_up(fifo_sz, 32);
+
+out:
+ dev_dbg(tc358746->sd.dev,
+ "Found FIFO size[bits]:%u -> aligned to size[bits]:%u\n",
+ fifo_sz, tc358746->vb_size);
+
+ v4l2_subdev_unlock_state(sink_state);
+
+ return tc358746->vb_size > TC358746_VB_MAX_SIZE ? -EINVAL : 0;
+}
+
+static int tc358746_get_mbus_config(struct v4l2_subdev *sd, unsigned int pad,
+ struct v4l2_mbus_config *config)
+{
+ struct tc358746 *tc358746 = to_tc358746(sd);
+
+ if (pad != TC358746_SOURCE)
+ return -EINVAL;
+
+ config->type = V4L2_MBUS_CSI2_DPHY;
+ config->bus.mipi_csi2 = tc358746->csi_vep.bus.mipi_csi2;
+
+ return 0;
+}
+
+static int __maybe_unused
+tc358746_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
+{
+ struct tc358746 *tc358746 = to_tc358746(sd);
+
+ /* 32-bit registers starting from CLW_DPHYCONTTX */
+ reg->size = reg->reg < CLW_DPHYCONTTX_REG ? 2 : 4;
+
+ if (!pm_runtime_get_if_in_use(sd->dev))
+ return 0;
+
+ tc358746_read(tc358746, reg->reg, (u32 *)®->val);
+
+ pm_runtime_mark_last_busy(sd->dev);
+ pm_runtime_put_sync_autosuspend(sd->dev);
+
+ return 0;
+}
+
+static int __maybe_unused
+tc358746_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
+{
+ struct tc358746 *tc358746 = to_tc358746(sd);
+
+ if (!pm_runtime_get_if_in_use(sd->dev))
+ return 0;
+
+ tc358746_write(tc358746, (u32)reg->reg, (u32)reg->val);
+
+ pm_runtime_mark_last_busy(sd->dev);
+ pm_runtime_put_sync_autosuspend(sd->dev);
+
+ return 0;
+}
+
+static const struct v4l2_subdev_core_ops tc358746_core_ops = {
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+ .g_register = tc358746_g_register,
+ .s_register = tc358746_s_register,
+#endif
+};
+
+static const struct v4l2_subdev_video_ops tc358746_video_ops = {
+ .s_stream = tc358746_s_stream,
+};
+
+static const struct v4l2_subdev_pad_ops tc358746_pad_ops = {
+ .init_cfg = tc358746_init_cfg,
+ .enum_mbus_code = tc358746_enum_mbus_code,
+ .set_fmt = tc358746_set_fmt,
+ .get_fmt = v4l2_subdev_get_fmt,
+ .link_validate = tc358746_link_validate,
+ .get_mbus_config = tc358746_get_mbus_config,
+};
+
+static const struct v4l2_subdev_ops tc358746_ops = {
+ .core = &tc358746_core_ops,
+ .video = &tc358746_video_ops,
+ .pad = &tc358746_pad_ops,
+};
+
+static const struct media_entity_operations tc358746_entity_ops = {
+ .get_fwnode_pad = v4l2_subdev_get_fwnode_pad_1_to_1,
+ .link_validate = v4l2_subdev_link_validate,
+};
+
+static int tc358746_mclk_enable(struct clk_hw *hw)
+{
+ struct tc358746 *tc358746 = clk_hw_to_tc358746(hw);
+ unsigned int div;
+ u32 val;
+ int err;
+
+ div = tc358746->mclk_postdiv / 2;
+ val = MCLK_HIGH(div - 1) | MCLK_LOW(div - 1);
+ dev_dbg(tc358746->sd.dev, "MCLKCTL: %u (0x%x)\n", val, val);
+ err = tc358746_write(tc358746, MCLKCTL_REG, val);
+ if (err)
+ return err;
+
+ if (tc358746->mclk_prediv == 8)
+ val = MCLKDIV(MCLKDIV_8);
+ else if (tc358746->mclk_prediv == 4)
+ val = MCLKDIV(MCLKDIV_4);
+ else
+ val = MCLKDIV(MCLKDIV_2);
+
+ dev_dbg(tc358746->sd.dev, "CLKCTL[MCLKDIV]: %u (0x%x)\n", val, val);
+
+ return tc358746_update_bits(tc358746, CLKCTL_REG, MCLKDIV_MASK, val);
+}
+
+static void tc358746_mclk_disable(struct clk_hw *hw)
+{
+ struct tc358746 *tc358746 = clk_hw_to_tc358746(hw);
+
+ tc358746_write(tc358746, MCLKCTL_REG, 0);
+}
+
+static long
+tc358746_find_mclk_settings(struct tc358746 *tc358746, unsigned long mclk_rate)
+{
+ unsigned long pll_rate = tc358746->pll_rate;
+ const unsigned char prediv[] = { 2, 4, 8 };
+ unsigned int mclk_prediv, mclk_postdiv;
+ struct device *dev = tc358746->sd.dev;
+ unsigned int postdiv, mclkdiv;
+ unsigned long best_mclk_rate;
+ unsigned int i;
+
+ /*
+ * MCLK-Div
+ * -------------------´`---------------------
+ * ´ `
+ * +-------------+ +------------------------+
+ * | MCLK-PreDiv | | MCLK-PostDiv |
+ * PLL --> | (2/4/8) | --> | (mclk_low + mclk_high) | --> MCLK
+ * +-------------+ +------------------------+
+ *
+ * The register value of mclk_low/high is mclk_low/high+1, i.e.:
+ * mclk_low/high = 1 --> 2 MCLK-Ref Counts
+ * mclk_low/high = 255 --> 256 MCLK-Ref Counts == max.
+ * If mclk_low and mclk_high are 0 then MCLK is disabled.
+ *
+ * Keep it simple and support 50/50 duty cycles only for now,
+ * so the calc will be:
+ *
+ * MCLK = PLL / (MCLK-PreDiv * 2 * MCLK-PostDiv)
+ */
+
+ if (mclk_rate == tc358746->mclk_rate)
+ return mclk_rate;
+
+ /* Highest possible rate */
+ mclkdiv = pll_rate / mclk_rate;
+ if (mclkdiv <= 8) {
+ mclk_prediv = 2;
+ mclk_postdiv = 4;
+ best_mclk_rate = pll_rate / (2 * 4);
+ goto out;
+ }
+
+ /* First check the prediv */
+ for (i = 0; i < ARRAY_SIZE(prediv); i++) {
+ postdiv = mclkdiv / prediv[i];
+
+ if (postdiv % 2)
+ continue;
+
+ if (postdiv >= 4 && postdiv <= 512) {
+ mclk_prediv = prediv[i];
+ mclk_postdiv = postdiv;
+ best_mclk_rate = pll_rate / (prediv[i] * postdiv);
+ goto out;
+ }
+ }
+
+ /* No suitable prediv found, so try to adjust the postdiv */
+ for (postdiv = 4; postdiv <= 512; postdiv += 2) {
+ unsigned int pre;
+
+ pre = mclkdiv / postdiv;
+ if (pre == 2 || pre == 4 || pre == 8) {
+ mclk_prediv = pre;
+ mclk_postdiv = postdiv;
+ best_mclk_rate = pll_rate / (pre * postdiv);
+ goto out;
+ }
+ }
+
+ /* The MCLK <-> PLL gap is to high -> use largest possible div */
+ mclk_prediv = 8;
+ mclk_postdiv = 512;
+ best_mclk_rate = pll_rate / (8 * 512);
+
+out:
+ tc358746->mclk_prediv = mclk_prediv;
+ tc358746->mclk_postdiv = mclk_postdiv;
+ tc358746->mclk_rate = best_mclk_rate;
+
+ if (best_mclk_rate != mclk_rate)
+ dev_warn(dev, "Request MCLK freq:%lu, found MCLK freq:%lu\n",
+ mclk_rate, best_mclk_rate);
+
+ dev_dbg(dev, "Found MCLK settings: freq:%lu prediv:%u postdiv:%u\n",
+ best_mclk_rate, mclk_prediv, mclk_postdiv);
+
+ return best_mclk_rate;
+}
+
+static unsigned long
+tc358746_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
+{
+ struct tc358746 *tc358746 = clk_hw_to_tc358746(hw);
+ unsigned int prediv, postdiv;
+ u32 val;
+ int err;
+
+ err = tc358746_read(tc358746, MCLKCTL_REG, &val);
+ if (err)
+ return 0;
+
+ postdiv = FIELD_GET(MCLK_LOW_MASK, val) + 1;
+ postdiv += FIELD_GET(MCLK_HIGH_MASK, val) + 1;
+
+ err = tc358746_read(tc358746, CLKCTL_REG, &val);
+ if (err)
+ return 0;
+
+ prediv = FIELD_GET(MCLKDIV_MASK, val);
+ if (prediv == MCLKDIV_8)
+ prediv = 8;
+ else if (prediv == MCLKDIV_4)
+ prediv = 4;
+ else
+ prediv = 2;
+
+ return tc358746->pll_rate / (prediv * postdiv);
+}
+
+static long tc358746_mclk_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *parent_rate)
+{
+ struct tc358746 *tc358746 = clk_hw_to_tc358746(hw);
+
+ *parent_rate = tc358746->pll_rate;
+
+ return tc358746_find_mclk_settings(tc358746, rate);
+}
+
+static int tc358746_mclk_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct tc358746 *tc358746 = clk_hw_to_tc358746(hw);
+
+ tc358746_find_mclk_settings(tc358746, rate);
+
+ return tc358746_mclk_enable(hw);
+}
+
+static const struct clk_ops tc358746_mclk_ops = {
+ .enable = tc358746_mclk_enable,
+ .disable = tc358746_mclk_disable,
+ .recalc_rate = tc358746_recalc_rate,
+ .round_rate = tc358746_mclk_round_rate,
+ .set_rate = tc358746_mclk_set_rate,
+};
+
+static int tc358746_setup_mclk_provider(struct tc358746 *tc358746)
+{
+ struct clk_init_data mclk_initdata = { };
+ struct device *dev = tc358746->sd.dev;
+ const char *mclk_name;
+ int err;
+
+ /* MCLK clk provider support is optional */
+ if (!device_property_present(dev, "#clock-cells"))
+ return 0;
+
+ /* Init to highest possibel MCLK */
+ tc358746->mclk_postdiv = 512;
+ tc358746->mclk_prediv = 8;
+
+ mclk_name = "tc358746-mclk";
+ device_property_read_string(dev, "clock-output-names", &mclk_name);
+
+ mclk_initdata.name = mclk_name;
+ mclk_initdata.ops = &tc358746_mclk_ops;
+ tc358746->mclk_hw.init = &mclk_initdata;
+
+ err = devm_clk_hw_register(dev, &tc358746->mclk_hw);
+ if (err) {
+ dev_err(dev, "Failed to register mclk provider\n");
+ return err;
+ }
+
+ err = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
+ &tc358746->mclk_hw);
+ if (err)
+ dev_err(dev, "Failed to add mclk provider\n");
+
+ return err;
+}
+
+static int
+tc358746_init_subdev(struct tc358746 *tc358746, struct i2c_client *client)
+{
+ struct v4l2_subdev *sd = &tc358746->sd;
+ int err;
+
+ v4l2_i2c_subdev_init(sd, client, &tc358746_ops);
+ sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+ sd->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
+ sd->entity.ops = &tc358746_entity_ops;
+
+ tc358746->pads[TC358746_SINK].flags = MEDIA_PAD_FL_SINK;
+ tc358746->pads[TC358746_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
+ err = media_entity_pads_init(&sd->entity, TC358746_NR_PADS,
+ tc358746->pads);
+ if (err)
+ return err;
+
+ err = v4l2_subdev_init_finalize(sd);
+ if (err)
+ media_entity_cleanup(&sd->entity);
+
+ return err;
+}
+
+static int
+tc358746_init_output_port(struct tc358746 *tc358746, unsigned long refclk)
+{
+ struct device *dev = tc358746->sd.dev;
+ struct v4l2_fwnode_endpoint *vep;
+ unsigned long csi_link_rate;
+ struct fwnode_handle *ep;
+ unsigned char csi_lanes;
+ int err;
+
+ ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), TC358746_SOURCE,
+ 0, 0);
+ if (!ep) {
+ dev_err(dev, "Missing endpoint node\n");
+ return -EINVAL;
+ }
+
+ /* Currently we only support 'parallel in' -> 'csi out' */
+ vep = &tc358746->csi_vep;
+ vep->bus_type = V4L2_MBUS_CSI2_DPHY;
+ err = v4l2_fwnode_endpoint_alloc_parse(ep, vep);
+ fwnode_handle_put(ep);
+ if (err) {
+ dev_err(dev, "Failed to parse source endpoint\n");
+ return err;
+ }
+
+ csi_lanes = vep->bus.mipi_csi2.num_data_lanes;
+ if (csi_lanes == 0 || csi_lanes > 4 ||
+ vep->nr_of_link_frequencies == 0) {
+ dev_err(dev, "error: Invalid CSI-2 settings\n");
+ err = -EINVAL;
+ goto err;
+ }
+
+ /* TODO: Add support to handle multiple link frequencies */
+ csi_link_rate = (unsigned long)vep->link_frequencies[0];
+ tc358746->pll_rate = tc358746_find_pll_settings(tc358746, refclk,
+ csi_link_rate * 2);
+ if (!tc358746->pll_rate) {
+ err = -EINVAL;
+ goto err;
+ }
+
+ err = phy_mipi_dphy_get_default_config_for_hsclk(tc358746->pll_rate,
+ csi_lanes, &tc358746->dphy_cfg);
+ if (err)
+ goto err;
+
+ tc358746->vb_size = TC358746_VB_DEFAULT_SIZE;
+
+ return 0;
+
+err:
+ v4l2_fwnode_endpoint_free(vep);
+
+ return err;
+}
+
+static int tc358746_init_hw(struct tc358746 *tc358746)
+{
+ struct device *dev = tc358746->sd.dev;
+ unsigned int chipid;
+ u32 val;
+ int err;
+
+ err = pm_runtime_resume_and_get(dev);
+ if (err < 0) {
+ dev_err(dev, "Failed to resume the device\n");
+ return err;
+ }
+
+ /* Ensure that CSI interface is put into LP-11 state */
+ err = tc358746_sw_reset(tc358746);
+ if (err) {
+ pm_runtime_put_sync(dev);
+ dev_err(dev, "Failed to reset the device\n");
+ return err;
+ }
+
+ err = tc358746_read(tc358746, CHIPID_REG, &val);
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_sync_autosuspend(dev);
+ if (err)
+ return -ENODEV;
+
+ chipid = FIELD_GET(CHIPID, val);
+ if (chipid != 0x44) {
+ dev_err(dev, "Invalid chipid 0x%02x\n", chipid);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int tc358746_init_controls(struct tc358746 *tc358746)
+{
+ u64 *link_frequencies = tc358746->csi_vep.link_frequencies;
+ struct v4l2_ctrl *ctrl;
+ int err;
+
+ err = v4l2_ctrl_handler_init(&tc358746->ctrl_hdl, 1);
+ if (err)
+ return err;
+
+ /*
+ * The driver currently supports only one link-frequency, regardless of
+ * the input from the firmware, see: tc358746_init_output_port(). So
+ * report only the first frequency from the array of possible given
+ * frequencies.
+ */
+ ctrl = v4l2_ctrl_new_int_menu(&tc358746->ctrl_hdl, NULL,
+ V4L2_CID_LINK_FREQ, 0, 0,
+ link_frequencies);
+ if (ctrl)
+ ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+ err = tc358746->ctrl_hdl.error;
+ if (err) {
+ v4l2_ctrl_handler_free(&tc358746->ctrl_hdl);
+ return err;
+ }
+
+ tc358746->sd.ctrl_handler = &tc358746->ctrl_hdl;
+
+ return 0;
+}
+
+static int tc358746_notify_bound(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *sd,
+ struct v4l2_async_subdev *asd)
+{
+ struct tc358746 *tc358746 =
+ container_of(notifier, struct tc358746, notifier);
+ u32 flags = MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE;
+ struct media_pad *sink = &tc358746->pads[TC358746_SINK];
+
+ return v4l2_create_fwnode_links_to_pad(sd, sink, flags);
+}
+
+static const struct v4l2_async_notifier_operations tc358746_notify_ops = {
+ .bound = tc358746_notify_bound,
+};
+
+static int tc358746_async_register(struct tc358746 *tc358746)
+{
+ struct v4l2_fwnode_endpoint vep = {
+ .bus_type = V4L2_MBUS_PARALLEL,
+ };
+ struct v4l2_async_subdev *asd;
+ struct fwnode_handle *ep;
+ int err;
+
+ ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(tc358746->sd.dev),
+ TC358746_SINK, 0, 0);
+ if (!ep)
+ return -ENOTCONN;
+
+ err = v4l2_fwnode_endpoint_parse(ep, &vep);
+ if (err) {
+ fwnode_handle_put(ep);
+ return err;
+ }
+
+ v4l2_async_nf_init(&tc358746->notifier);
+ asd = v4l2_async_nf_add_fwnode_remote(&tc358746->notifier, ep,
+ struct v4l2_async_subdev);
+ fwnode_handle_put(ep);
+
+ if (IS_ERR(asd)) {
+ err = PTR_ERR(asd);
+ goto err_cleanup;
+ }
+
+ tc358746->notifier.ops = &tc358746_notify_ops;
+
+ err = v4l2_async_subdev_nf_register(&tc358746->sd, &tc358746->notifier);
+ if (err)
+ goto err_cleanup;
+
+ tc358746->sd.fwnode = fwnode_graph_get_endpoint_by_id(
+ dev_fwnode(tc358746->sd.dev), TC358746_SOURCE, 0, 0);
+
+ err = v4l2_async_register_subdev(&tc358746->sd);
+ if (err)
+ goto err_unregister;
+
+ return 0;
+
+err_unregister:
+ fwnode_handle_put(tc358746->sd.fwnode);
+ v4l2_async_nf_unregister(&tc358746->notifier);
+err_cleanup:
+ v4l2_async_nf_cleanup(&tc358746->notifier);
+
+ return err;
+}
+
+static int tc358746_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct tc358746 *tc358746;
+ unsigned long refclk;
+ unsigned int i;
+ int err;
+
+ tc358746 = devm_kzalloc(&client->dev, sizeof(*tc358746), GFP_KERNEL);
+ if (!tc358746)
+ return -ENOMEM;
+
+ tc358746->regmap = devm_regmap_init_i2c(client, &tc358746_regmap_config);
+ if (IS_ERR(tc358746->regmap))
+ return dev_err_probe(dev, PTR_ERR(tc358746->regmap),
+ "Failed to init regmap\n");
+
+ tc358746->refclk = devm_clk_get(dev, "refclk");
+ if (IS_ERR(tc358746->refclk))
+ return dev_err_probe(dev, PTR_ERR(tc358746->refclk),
+ "Failed to get refclk\n");
+
+ err = clk_prepare_enable(tc358746->refclk);
+ if (err)
+ return dev_err_probe(dev, err,
+ "Failed to enable refclk\n");
+
+ refclk = clk_get_rate(tc358746->refclk);
+ clk_disable_unprepare(tc358746->refclk);
+
+ if (refclk < 6 * HZ_PER_MHZ || refclk > 40 * HZ_PER_MHZ)
+ return dev_err_probe(dev, -EINVAL, "Invalid refclk range\n");
+
+ for (i = 0; i < ARRAY_SIZE(tc358746_supplies); i++)
+ tc358746->supplies[i].supply = tc358746_supplies[i];
+
+ err = devm_regulator_bulk_get(dev, ARRAY_SIZE(tc358746_supplies),
+ tc358746->supplies);
+ if (err)
+ return dev_err_probe(dev, err, "Failed to get supplies\n");
+
+ tc358746->reset_gpio = devm_gpiod_get_optional(dev, "reset",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(tc358746->reset_gpio))
+ return dev_err_probe(dev, PTR_ERR(tc358746->reset_gpio),
+ "Failed to get reset-gpios\n");
+
+ err = tc358746_init_subdev(tc358746, client);
+ if (err)
+ return dev_err_probe(dev, err, "Failed to init subdev\n");
+
+ err = tc358746_init_output_port(tc358746, refclk);
+ if (err)
+ goto err_subdev;
+
+ /*
+ * Keep this order since we need the output port link-frequencies
+ * information.
+ */
+ err = tc358746_init_controls(tc358746);
+ if (err)
+ goto err_fwnode;
+
+ dev_set_drvdata(dev, tc358746);
+
+ /* Set to 1sec to give the stream reconfiguration enough time */
+ pm_runtime_set_autosuspend_delay(dev, 1000);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_enable(dev);
+
+ err = tc358746_init_hw(tc358746);
+ if (err)
+ goto err_pm;
+
+ err = tc358746_setup_mclk_provider(tc358746);
+ if (err)
+ goto err_pm;
+
+ err = tc358746_async_register(tc358746);
+ if (err < 0)
+ goto err_pm;
+
+ dev_dbg(dev, "%s found @ 0x%x (%s)\n", client->name,
+ client->addr, client->adapter->name);
+
+ return 0;
+
+err_pm:
+ pm_runtime_disable(dev);
+ pm_runtime_set_suspended(dev);
+ pm_runtime_dont_use_autosuspend(dev);
+ v4l2_ctrl_handler_free(&tc358746->ctrl_hdl);
+err_fwnode:
+ v4l2_fwnode_endpoint_free(&tc358746->csi_vep);
+err_subdev:
+ v4l2_subdev_cleanup(&tc358746->sd);
+ media_entity_cleanup(&tc358746->sd.entity);
+
+ return err;
+}
+
+static void tc358746_remove(struct i2c_client *client)
+{
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+ struct tc358746 *tc358746 = to_tc358746(sd);
+
+ v4l2_subdev_cleanup(sd);
+ v4l2_ctrl_handler_free(&tc358746->ctrl_hdl);
+ v4l2_fwnode_endpoint_free(&tc358746->csi_vep);
+ v4l2_async_nf_unregister(&tc358746->notifier);
+ v4l2_async_nf_cleanup(&tc358746->notifier);
+ fwnode_handle_put(sd->fwnode);
+ v4l2_async_unregister_subdev(sd);
+ media_entity_cleanup(&sd->entity);
+
+ pm_runtime_disable(sd->dev);
+ pm_runtime_set_suspended(sd->dev);
+ pm_runtime_dont_use_autosuspend(sd->dev);
+}
+
+static int tc358746_suspend(struct device *dev)
+{
+ struct tc358746 *tc358746 = dev_get_drvdata(dev);
+ int err;
+
+ clk_disable_unprepare(tc358746->refclk);
+
+ err = regulator_bulk_disable(ARRAY_SIZE(tc358746_supplies),
+ tc358746->supplies);
+ if (err)
+ clk_prepare_enable(tc358746->refclk);
+
+ return err;
+}
+
+static int tc358746_resume(struct device *dev)
+{
+ struct tc358746 *tc358746 = dev_get_drvdata(dev);
+ int err;
+
+ gpiod_set_value(tc358746->reset_gpio, 1);
+
+ err = regulator_bulk_enable(ARRAY_SIZE(tc358746_supplies),
+ tc358746->supplies);
+ if (err)
+ return err;
+
+ /* min. 200ns */
+ usleep_range(10, 20);
+
+ gpiod_set_value(tc358746->reset_gpio, 0);
+
+ err = clk_prepare_enable(tc358746->refclk);
+ if (err)
+ goto err;
+
+ /* min. 700us ... 1ms */
+ usleep_range(1000, 1500);
+
+ /*
+ * Enable the PLL here since it can be called by the clk-framework or by
+ * the .s_stream() callback. So this is the common place for both.
+ */
+ err = tc358746_apply_pll_config(tc358746);
+ if (err)
+ goto err_clk;
+
+ return 0;
+
+err_clk:
+ clk_disable_unprepare(tc358746->refclk);
+err:
+ regulator_bulk_disable(ARRAY_SIZE(tc358746_supplies),
+ tc358746->supplies);
+ return err;
+}
+
+DEFINE_RUNTIME_DEV_PM_OPS(tc358746_pm_ops, tc358746_suspend,
+ tc358746_resume, NULL);
+
+static const struct of_device_id __maybe_unused tc358746_of_match[] = {
+ { .compatible = "toshiba,tc358746" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tc358746_of_match);
+
+static struct i2c_driver tc358746_driver = {
+ .driver = {
+ .name = "tc358746",
+ .pm = pm_ptr(&tc358746_pm_ops),
+ .of_match_table = tc358746_of_match,
+ },
+ .probe_new = tc358746_probe,
+ .remove = tc358746_remove,
+};
+
+module_i2c_driver(tc358746_driver);
+
+MODULE_DESCRIPTION("Toshiba TC358746 Parallel to CSI-2 bridge driver");
+MODULE_AUTHOR("Marco Felsch <kernel@pengutronix.de>");
+MODULE_LICENSE("GPL");
projects / platform / kernel / linux-rpi.git / commitdiff