A V4L2 driver for Renesas R-Car MIPI CSI-2 receiver. The driver
supports the rcar-vin driver on R-Car Gen3 SoCs where separate CSI-2
hardware blocks are connected between the video sources and the video
grabbers (VIN).
Driver is based on a prototype by Koji Matsuoka in the Renesas BSP.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
---
drivers/media/platform/rcar-vin/Kconfig | 12 +
drivers/media/platform/rcar-vin/Makefile | 1 +
drivers/media/platform/rcar-vin/rcar-csi2.c | 934 ++++++++++++++++++++++++++++
3 files changed, 947 insertions(+)
create mode 100644 drivers/media/platform/rcar-vin/rcar-csi2.c
diff --git a/drivers/media/platform/rcar-vin/Kconfig b/drivers/media/platform/rcar-vin/Kconfig
index af4c98b44d2e22cb..6875f30c1ae42631 100644
--- a/drivers/media/platform/rcar-vin/Kconfig
+++ b/drivers/media/platform/rcar-vin/Kconfig
@@ -1,3 +1,15 @@
+config VIDEO_RCAR_CSI2
+ tristate "R-Car MIPI CSI-2 Receiver"
+ depends on VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API && OF
+ depends on ARCH_RENESAS || COMPILE_TEST
+ select V4L2_FWNODE
+ ---help---
+ Support for Renesas R-Car MIPI CSI-2 receiver.
+ Supports R-Car Gen3 SoCs.
+
+ To compile this driver as a module, choose M here: the
+ module will be called rcar-csi2.
+
config VIDEO_RCAR_VIN
tristate "R-Car Video Input (VIN) Driver"
depends on VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API && OF && HAS_DMA && MEDIA_CONTROLLER
diff --git a/drivers/media/platform/rcar-vin/Makefile b/drivers/media/platform/rcar-vin/Makefile
index 48c5632c21dc060b..5ab803d3e7c1aa57 100644
--- a/drivers/media/platform/rcar-vin/Makefile
+++ b/drivers/media/platform/rcar-vin/Makefile
@@ -1,3 +1,4 @@
rcar-vin-objs = rcar-core.o rcar-dma.o rcar-v4l2.o
+obj-$(CONFIG_VIDEO_RCAR_CSI2) += rcar-csi2.o
obj-$(CONFIG_VIDEO_RCAR_VIN) += rcar-vin.o
diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
new file mode 100644
index 0000000000000000..27d09da191a09b39
--- /dev/null
+++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
@@ -0,0 +1,934 @@
+/*
+ * Driver for Renesas R-Car MIPI CSI-2 Receiver
+ *
+ * Copyright (C) 2017 Renesas Electronics Corp.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/sys_soc.h>
+
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-mc.h>
+#include <media/v4l2-subdev.h>
+
+/* Register offsets and bits */
+
+/* Control Timing Select */
+#define TREF_REG 0x00
+#define TREF_TREF BIT(0)
+
+/* Software Reset */
+#define SRST_REG 0x04
+#define SRST_SRST BIT(0)
+
+/* PHY Operation Control */
+#define PHYCNT_REG 0x08
+#define PHYCNT_SHUTDOWNZ BIT(17)
+#define PHYCNT_RSTZ BIT(16)
+#define PHYCNT_ENABLECLK BIT(4)
+#define PHYCNT_ENABLE_3 BIT(3)
+#define PHYCNT_ENABLE_2 BIT(2)
+#define PHYCNT_ENABLE_1 BIT(1)
+#define PHYCNT_ENABLE_0 BIT(0)
+
+/* Checksum Control */
+#define CHKSUM_REG 0x0c
+#define CHKSUM_ECC_EN BIT(1)
+#define CHKSUM_CRC_EN BIT(0)
+
+/*
+ * Channel Data Type Select
+ * VCDT[0-15]: Channel 1 VCDT[16-31]: Channel 2
+ * VCDT2[0-15]: Channel 3 VCDT2[16-31]: Channel 4
+ */
+#define VCDT_REG 0x10
+#define VCDT2_REG 0x14
+#define VCDT_VCDTN_EN BIT(15)
+#define VCDT_SEL_VC(n) (((n) & 0x3) << 8)
+#define VCDT_SEL_DTN_ON BIT(6)
+#define VCDT_SEL_DT(n) (((n) & 0x3f) << 0)
+
+/* Frame Data Type Select */
+#define FRDT_REG 0x18
+
+/* Field Detection Control */
+#define FLD_REG 0x1c
+#define FLD_FLD_NUM(n) (((n) & 0xff) << 16)
+#define FLD_FLD_EN4 BIT(3)
+#define FLD_FLD_EN3 BIT(2)
+#define FLD_FLD_EN2 BIT(1)
+#define FLD_FLD_EN BIT(0)
+
+/* Automatic Standby Control */
+#define ASTBY_REG 0x20
+
+/* Long Data Type Setting 0 */
+#define LNGDT0_REG 0x28
+
+/* Long Data Type Setting 1 */
+#define LNGDT1_REG 0x2c
+
+/* Interrupt Enable */
+#define INTEN_REG 0x30
+
+/* Interrupt Source Mask */
+#define INTCLOSE_REG 0x34
+
+/* Interrupt Status Monitor */
+#define INTSTATE_REG 0x38
+#define INTSTATE_INT_ULPS_START BIT(7)
+#define INTSTATE_INT_ULPS_END BIT(6)
+
+/* Interrupt Error Status Monitor */
+#define INTERRSTATE_REG 0x3c
+
+/* Short Packet Data */
+#define SHPDAT_REG 0x40
+
+/* Short Packet Count */
+#define SHPCNT_REG 0x44
+
+/* LINK Operation Control */
+#define LINKCNT_REG 0x48
+#define LINKCNT_MONITOR_EN BIT(31)
+#define LINKCNT_REG_MONI_PACT_EN BIT(25)
+#define LINKCNT_ICLK_NONSTOP BIT(24)
+
+/* Lane Swap */
+#define LSWAP_REG 0x4c
+#define LSWAP_L3SEL(n) (((n) & 0x3) << 6)
+#define LSWAP_L2SEL(n) (((n) & 0x3) << 4)
+#define LSWAP_L1SEL(n) (((n) & 0x3) << 2)
+#define LSWAP_L0SEL(n) (((n) & 0x3) << 0)
+
+/* PHY Test Interface Write Register */
+#define PHTW_REG 0x50
+
+/* PHY Test Interface Clear */
+#define PHTC_REG 0x58
+#define PHTC_TESTCLR BIT(0)
+
+/* PHY Frequency Control */
+#define PHYPLL_REG 0x68
+#define PHYPLL_HSFREQRANGE(n) ((n) << 16)
+
+struct phypll_hsfreqrange {
+ u16 mbps;
+ u16 reg;
+};
+
+static const struct phypll_hsfreqrange hsfreqrange_h3_v3h_m3n[] = {
+ { .mbps = 80, .reg = 0x00 },
+ { .mbps = 90, .reg = 0x10 },
+ { .mbps = 100, .reg = 0x20 },
+ { .mbps = 110, .reg = 0x30 },
+ { .mbps = 120, .reg = 0x01 },
+ { .mbps = 130, .reg = 0x11 },
+ { .mbps = 140, .reg = 0x21 },
+ { .mbps = 150, .reg = 0x31 },
+ { .mbps = 160, .reg = 0x02 },
+ { .mbps = 170, .reg = 0x12 },
+ { .mbps = 180, .reg = 0x22 },
+ { .mbps = 190, .reg = 0x32 },
+ { .mbps = 205, .reg = 0x03 },
+ { .mbps = 220, .reg = 0x13 },
+ { .mbps = 235, .reg = 0x23 },
+ { .mbps = 250, .reg = 0x33 },
+ { .mbps = 275, .reg = 0x04 },
+ { .mbps = 300, .reg = 0x14 },
+ { .mbps = 325, .reg = 0x25 },
+ { .mbps = 350, .reg = 0x35 },
+ { .mbps = 400, .reg = 0x05 },
+ { .mbps = 450, .reg = 0x26 },
+ { .mbps = 500, .reg = 0x36 },
+ { .mbps = 550, .reg = 0x37 },
+ { .mbps = 600, .reg = 0x07 },
+ { .mbps = 650, .reg = 0x18 },
+ { .mbps = 700, .reg = 0x28 },
+ { .mbps = 750, .reg = 0x39 },
+ { .mbps = 800, .reg = 0x09 },
+ { .mbps = 850, .reg = 0x19 },
+ { .mbps = 900, .reg = 0x29 },
+ { .mbps = 950, .reg = 0x3a },
+ { .mbps = 1000, .reg = 0x0a },
+ { .mbps = 1050, .reg = 0x1a },
+ { .mbps = 1100, .reg = 0x2a },
+ { .mbps = 1150, .reg = 0x3b },
+ { .mbps = 1200, .reg = 0x0b },
+ { .mbps = 1250, .reg = 0x1b },
+ { .mbps = 1300, .reg = 0x2b },
+ { .mbps = 1350, .reg = 0x3c },
+ { .mbps = 1400, .reg = 0x0c },
+ { .mbps = 1450, .reg = 0x1c },
+ { .mbps = 1500, .reg = 0x2c },
+ /* guard */
+ { .mbps = 0, .reg = 0x00 },
+};
+
+static const struct phypll_hsfreqrange hsfreqrange_m3w_h3es1[] = {
+ { .mbps = 80, .reg = 0x00 },
+ { .mbps = 90, .reg = 0x10 },
+ { .mbps = 100, .reg = 0x20 },
+ { .mbps = 110, .reg = 0x30 },
+ { .mbps = 120, .reg = 0x01 },
+ { .mbps = 130, .reg = 0x11 },
+ { .mbps = 140, .reg = 0x21 },
+ { .mbps = 150, .reg = 0x31 },
+ { .mbps = 160, .reg = 0x02 },
+ { .mbps = 170, .reg = 0x12 },
+ { .mbps = 180, .reg = 0x22 },
+ { .mbps = 190, .reg = 0x32 },
+ { .mbps = 205, .reg = 0x03 },
+ { .mbps = 220, .reg = 0x13 },
+ { .mbps = 235, .reg = 0x23 },
+ { .mbps = 250, .reg = 0x33 },
+ { .mbps = 275, .reg = 0x04 },
+ { .mbps = 300, .reg = 0x14 },
+ { .mbps = 325, .reg = 0x05 },
+ { .mbps = 350, .reg = 0x15 },
+ { .mbps = 400, .reg = 0x25 },
+ { .mbps = 450, .reg = 0x06 },
+ { .mbps = 500, .reg = 0x16 },
+ { .mbps = 550, .reg = 0x07 },
+ { .mbps = 600, .reg = 0x17 },
+ { .mbps = 650, .reg = 0x08 },
+ { .mbps = 700, .reg = 0x18 },
+ { .mbps = 750, .reg = 0x09 },
+ { .mbps = 800, .reg = 0x19 },
+ { .mbps = 850, .reg = 0x29 },
+ { .mbps = 900, .reg = 0x39 },
+ { .mbps = 950, .reg = 0x0A },
+ { .mbps = 1000, .reg = 0x1A },
+ { .mbps = 1050, .reg = 0x2A },
+ { .mbps = 1100, .reg = 0x3A },
+ { .mbps = 1150, .reg = 0x0B },
+ { .mbps = 1200, .reg = 0x1B },
+ { .mbps = 1250, .reg = 0x2B },
+ { .mbps = 1300, .reg = 0x3B },
+ { .mbps = 1350, .reg = 0x0C },
+ { .mbps = 1400, .reg = 0x1C },
+ { .mbps = 1450, .reg = 0x2C },
+ { .mbps = 1500, .reg = 0x3C },
+ /* guard */
+ { .mbps = 0, .reg = 0x00 },
+};
+
+/* PHY ESC Error Monitor */
+#define PHEERM_REG 0x74
+
+/* PHY Clock Lane Monitor */
+#define PHCLM_REG 0x78
+
+/* PHY Data Lane Monitor */
+#define PHDLM_REG 0x7c
+
+/* CSI0CLK Frequency Configuration Preset Register */
+#define CSI0CLKFCPR_REG 0x260
+#define CSI0CLKFREQRANGE(n) ((n & 0x3f) << 16)
+
+struct rcar_csi2_format {
+ unsigned int code;
+ unsigned int datatype;
+ unsigned int bpp;
+};
+
+static const struct rcar_csi2_format rcar_csi2_formats[] = {
+ { .code = MEDIA_BUS_FMT_RGB888_1X24, .datatype = 0x24, .bpp = 24 },
+ { .code = MEDIA_BUS_FMT_UYVY8_1X16, .datatype = 0x1e, .bpp = 16 },
+ { .code = MEDIA_BUS_FMT_UYVY8_2X8, .datatype = 0x1e, .bpp = 16 },
+ { .code = MEDIA_BUS_FMT_YUYV10_2X10, .datatype = 0x1e, .bpp = 16 },
+};
+
+static const struct rcar_csi2_format *rcar_csi2_code_to_fmt(unsigned int code)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(rcar_csi2_formats); i++)
+ if (rcar_csi2_formats[i].code == code)
+ return rcar_csi2_formats + i;
+ return NULL;
+}
+
+enum rcar_csi2_pads {
+ RCAR_CSI2_SINK,
+ RCAR_CSI2_SOURCE_VC0,
+ RCAR_CSI2_SOURCE_VC1,
+ RCAR_CSI2_SOURCE_VC2,
+ RCAR_CSI2_SOURCE_VC3,
+ NR_OF_RCAR_CSI2_PAD,
+};
+
+struct rcar_csi2_info {
+ const struct phypll_hsfreqrange *hsfreqrange;
+ unsigned int csi0clkfreqrange;
+ bool clear_ulps;
+ bool have_phtw;
+};
+
+struct rcar_csi2 {
+ struct device *dev;
+ void __iomem *base;
+ const struct rcar_csi2_info *info;
+
+ struct v4l2_subdev subdev;
+ struct media_pad pads[NR_OF_RCAR_CSI2_PAD];
+
+ struct v4l2_async_notifier notifier;
+ struct v4l2_async_subdev remote;
+
+ struct v4l2_mbus_framefmt mf;
+
+ struct mutex lock;
+ int stream_count;
+
+ unsigned short lanes;
+ unsigned char lane_swap[4];
+};
+
+static inline struct rcar_csi2 *sd_to_csi2(struct v4l2_subdev *sd)
+{
+ return container_of(sd, struct rcar_csi2, subdev);
+}
+
+static inline struct rcar_csi2 *notifier_to_csi2(struct v4l2_async_notifier *n)
+{
+ return container_of(n, struct rcar_csi2, notifier);
+}
+
+static u32 rcar_csi2_read(struct rcar_csi2 *priv, unsigned int reg)
+{
+ return ioread32(priv->base + reg);
+}
+
+static void rcar_csi2_write(struct rcar_csi2 *priv, unsigned int reg, u32 data)
+{
+ iowrite32(data, priv->base + reg);
+}
+
+static void rcar_csi2_reset(struct rcar_csi2 *priv)
+{
+ rcar_csi2_write(priv, SRST_REG, SRST_SRST);
+ usleep_range(100, 150);
+ rcar_csi2_write(priv, SRST_REG, 0);
+}
+
+static int rcar_csi2_wait_phy_start(struct rcar_csi2 *priv)
+{
+ int timeout;
+
+ /* Wait for the clock and data lanes to enter LP-11 state. */
+ for (timeout = 100; timeout > 0; timeout--) {
+ const u32 lane_mask = (1 << priv->lanes) - 1;
+
+ if ((rcar_csi2_read(priv, PHCLM_REG) & 1) == 1 &&
+ (rcar_csi2_read(priv, PHDLM_REG) & lane_mask) == lane_mask)
+ return 0;
+
+ msleep(20);
+ }
+
+ dev_err(priv->dev, "Timeout waiting for LP-11 state\n");
+
+ return -ETIMEDOUT;
+}
+
+static int rcar_csi2_calc_phypll(struct rcar_csi2 *priv,
+ struct v4l2_subdev *source,
+ struct v4l2_mbus_framefmt *mf,
+ u32 *phypll)
+{
+ const struct phypll_hsfreqrange *hsfreq;
+ const struct rcar_csi2_format *format;
+ struct v4l2_ctrl *ctrl;
+ u64 mbps;
+
+ ctrl = v4l2_ctrl_find(source->ctrl_handler, V4L2_CID_PIXEL_RATE);
+ if (!ctrl) {
+ dev_err(priv->dev, "no link freq control in subdev %s\n",
+ source->name);
+ return -EINVAL;
+ }
+
+ format = rcar_csi2_code_to_fmt(mf->code);
+ if (!format) {
+ dev_err(priv->dev, "Unknown format: %d\n", mf->code);
+ return -EINVAL;
+ }
+
+ mbps = v4l2_ctrl_g_ctrl_int64(ctrl) * format->bpp;
+ do_div(mbps, priv->lanes * 1000000);
+
+ for (hsfreq = priv->info->hsfreqrange; hsfreq->mbps != 0; hsfreq++)
+ if (hsfreq->mbps >= mbps)
+ break;
+
+ if (!hsfreq->mbps) {
+ dev_err(priv->dev, "Unsupported PHY speed (%llu Mbps)", mbps);
+ return -ERANGE;
+ }
+
+ dev_dbg(priv->dev, "PHY HSFREQRANGE requested %llu got %u Mbps\n", mbps,
+ hsfreq->mbps);
+
+ *phypll = PHYPLL_HSFREQRANGE(hsfreq->reg);
+
+ return 0;
+}
+
+static int rcar_csi2_start(struct rcar_csi2 *priv)
+{
+ const struct rcar_csi2_format *format;
+ struct v4l2_subdev_format fmt;
+ struct media_pad *pad, *source_pad;
+ struct v4l2_subdev *source = NULL;
+ struct v4l2_mbus_framefmt *mf = &fmt.format;
+ u32 phycnt, phypll, tmp;
+ u32 vcdt = 0, vcdt2 = 0;
+ unsigned int i;
+ int ret;
+
+ pad = &priv->subdev.entity.pads[RCAR_CSI2_SINK];
+ source_pad = media_entity_remote_pad(pad);
+ if (!source_pad) {
+ dev_err(priv->dev, "Could not find remote source pad\n");
+ return -ENODEV;
+ }
+
+ source = media_entity_to_v4l2_subdev(source_pad->entity);
+ if (!source) {
+ dev_err(priv->dev, "Could not find remote subdevice\n");
+ return -ENODEV;
+ }
+
+ dev_dbg(priv->dev, "Using source %s pad: %u\n", source->name,
+ source_pad->index);
+
+ fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+ fmt.pad = source_pad->index;
+ ret = v4l2_subdev_call(source, pad, get_fmt, NULL, &fmt);
+ if (ret)
+ return ret;
+
+ dev_dbg(priv->dev, "Input size (%ux%u%c)\n", mf->width,
+ mf->height, mf->field == V4L2_FIELD_NONE ? 'p' : 'i');
+
+ /*
+ * Enable all Virtual Channels
+ *
+ * NOTE: It's not possible to get individual format for each
+ * source virtual channel. Once this is possible in V4L2
+ * it should be used here.
+ */
+ for (i = 0; i < 4; i++) {
+ format = rcar_csi2_code_to_fmt(mf->code);
+ if (!format) {
+ dev_err(priv->dev, "Unsupported media bus format: %d\n",
+ mf->code);
+ return -EINVAL;
+ }
+
+ tmp = VCDT_SEL_VC(i) | VCDT_VCDTN_EN | VCDT_SEL_DTN_ON |
+ VCDT_SEL_DT(format->datatype);
+
+ /* Store in correct reg and offset */
+ if (i < 2)
+ vcdt |= tmp << ((i % 2) * 16);
+ else
+ vcdt2 |= tmp << ((i % 2) * 16);
+ }
+
+ switch (priv->lanes) {
+ case 1:
+ phycnt = PHYCNT_ENABLECLK | PHYCNT_ENABLE_0;
+ break;
+ case 2:
+ phycnt = PHYCNT_ENABLECLK | PHYCNT_ENABLE_1 | PHYCNT_ENABLE_0;
+ break;
+ case 4:
+ phycnt = PHYCNT_ENABLECLK | PHYCNT_ENABLE_3 | PHYCNT_ENABLE_2 |
+ PHYCNT_ENABLE_1 | PHYCNT_ENABLE_0;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = rcar_csi2_calc_phypll(priv, source, mf, &phypll);
+ if (ret)
+ return ret;
+
+ /* Clear Ultra Low Power interrupt */
+ if (priv->info->clear_ulps)
+ rcar_csi2_write(priv, INTSTATE_REG,
+ INTSTATE_INT_ULPS_START |
+ INTSTATE_INT_ULPS_END);
+
+ /* Init */
+ rcar_csi2_write(priv, TREF_REG, TREF_TREF);
+ rcar_csi2_reset(priv);
+ rcar_csi2_write(priv, PHTC_REG, 0);
+
+ /* Configure */
+ rcar_csi2_write(priv, FLD_REG, FLD_FLD_NUM(2) | FLD_FLD_EN4 |
+ FLD_FLD_EN3 | FLD_FLD_EN2 | FLD_FLD_EN);
+ rcar_csi2_write(priv, VCDT_REG, vcdt);
+ rcar_csi2_write(priv, VCDT2_REG, vcdt2);
+ /* Lanes are zero indexed */
+ rcar_csi2_write(priv, LSWAP_REG,
+ LSWAP_L0SEL(priv->lane_swap[0] - 1) |
+ LSWAP_L1SEL(priv->lane_swap[1] - 1) |
+ LSWAP_L2SEL(priv->lane_swap[2] - 1) |
+ LSWAP_L3SEL(priv->lane_swap[3] - 1));
+
+ if (priv->info->have_phtw) {
+ /*
+ * This is for H3 ES2.0
+ *
+ * NOTE: Additional logic is needed here when
+ * support for V3H and/or M3-N is added
+ */
+ rcar_csi2_write(priv, PHTW_REG, 0x01cc01e2);
+ rcar_csi2_write(priv, PHTW_REG, 0x010101e3);
+ rcar_csi2_write(priv, PHTW_REG, 0x010101e4);
+ rcar_csi2_write(priv, PHTW_REG, 0x01100104);
+ rcar_csi2_write(priv, PHTW_REG, 0x01030100);
+ rcar_csi2_write(priv, PHTW_REG, 0x01800100);
+ }
+
+ /* Start */
+ rcar_csi2_write(priv, PHYPLL_REG, phypll);
+
+ /* Set frequency range if we have it */
+ if (priv->info->csi0clkfreqrange)
+ rcar_csi2_write(priv, CSI0CLKFCPR_REG,
+ CSI0CLKFREQRANGE(priv->info->csi0clkfreqrange));
+
+ rcar_csi2_write(priv, PHYCNT_REG, phycnt);
+ rcar_csi2_write(priv, LINKCNT_REG, LINKCNT_MONITOR_EN |
+ LINKCNT_REG_MONI_PACT_EN | LINKCNT_ICLK_NONSTOP);
+ rcar_csi2_write(priv, PHYCNT_REG, phycnt | PHYCNT_SHUTDOWNZ);
+ rcar_csi2_write(priv, PHYCNT_REG, phycnt | PHYCNT_SHUTDOWNZ |
+ PHYCNT_RSTZ);
+
+ return rcar_csi2_wait_phy_start(priv);
+}
+
+static void rcar_csi2_stop(struct rcar_csi2 *priv)
+{
+ rcar_csi2_write(priv, PHYCNT_REG, 0);
+
+ rcar_csi2_reset(priv);
+}
+
+static int rcar_csi2_sd_info(struct rcar_csi2 *priv, struct v4l2_subdev **sd)
+{
+ struct media_pad *pad;
+
+ pad = media_entity_remote_pad(&priv->pads[RCAR_CSI2_SINK]);
+ if (!pad) {
+ dev_err(priv->dev, "Could not find remote pad\n");
+ return -ENODEV;
+ }
+
+ *sd = media_entity_to_v4l2_subdev(pad->entity);
+ if (!*sd) {
+ dev_err(priv->dev, "Could not find remote subdevice\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int rcar_csi2_s_stream(struct v4l2_subdev *sd, int enable)
+{
+ struct rcar_csi2 *priv = sd_to_csi2(sd);
+ struct v4l2_subdev *nextsd;
+ int ret;
+
+ mutex_lock(&priv->lock);
+
+ ret = rcar_csi2_sd_info(priv, &nextsd);
+ if (ret)
+ goto out;
+
+ if (enable && priv->stream_count == 0) {
+ ret = rcar_csi2_start(priv);
+ if (ret)
+ goto out;
+
+ ret = v4l2_subdev_call(nextsd, video, s_stream, 1);
+ if (ret) {
+ rcar_csi2_stop(priv);
+ goto out;
+ }
+ } else if (!enable && priv->stream_count == 1) {
+ rcar_csi2_stop(priv);
+ ret = v4l2_subdev_call(nextsd, video, s_stream, 0);
+ }
+
+ priv->stream_count += enable ? 1 : -1;
+out:
+ mutex_unlock(&priv->lock);
+
+ return ret;
+}
+
+static int rcar_csi2_s_power(struct v4l2_subdev *sd, int on)
+{
+ struct rcar_csi2 *priv = sd_to_csi2(sd);
+
+ if (on)
+ pm_runtime_get_sync(priv->dev);
+ else
+ pm_runtime_put(priv->dev);
+
+ return 0;
+}
+
+static int rcar_csi2_set_pad_format(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *format)
+{
+ struct rcar_csi2 *priv = sd_to_csi2(sd);
+ struct v4l2_mbus_framefmt *framefmt;
+
+ if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
+ priv->mf = format->format;
+ } else {
+ framefmt = v4l2_subdev_get_try_format(sd, cfg, 0);
+ *framefmt = format->format;
+ }
+
+ return 0;
+}
+
+static int rcar_csi2_get_pad_format(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *format)
+{
+ struct rcar_csi2 *priv = sd_to_csi2(sd);
+
+ if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
+ format->format = priv->mf;
+ else
+ format->format = *v4l2_subdev_get_try_format(sd, cfg, 0);
+
+ return 0;
+}
+
+static const struct v4l2_subdev_video_ops rcar_csi2_video_ops = {
+ .s_stream = rcar_csi2_s_stream,
+};
+
+static const struct v4l2_subdev_core_ops rcar_csi2_subdev_core_ops = {
+ .s_power = rcar_csi2_s_power,
+};
+
+static const struct v4l2_subdev_pad_ops rcar_csi2_pad_ops = {
+ .set_fmt = rcar_csi2_set_pad_format,
+ .get_fmt = rcar_csi2_get_pad_format,
+};
+
+static const struct v4l2_subdev_ops rcar_csi2_subdev_ops = {
+ .video = &rcar_csi2_video_ops,
+ .core = &rcar_csi2_subdev_core_ops,
+ .pad = &rcar_csi2_pad_ops,
+};
+
+/* -----------------------------------------------------------------------------
+ * Async and registered of subdevices and links
+ */
+
+static int rcar_csi2_notify_bound(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *subdev,
+ struct v4l2_async_subdev *asd)
+{
+ struct rcar_csi2 *priv = notifier_to_csi2(notifier);
+ int pad;
+
+ v4l2_set_subdev_hostdata(subdev, priv);
+
+ pad = media_entity_get_fwnode_pad(&subdev->entity,
+ asd->match.fwnode.fwnode,
+ MEDIA_PAD_FL_SOURCE);
+ if (pad < 0) {
+ dev_err(priv->dev, "Failed to find pad for %s\n", subdev->name);
+ return pad;
+ }
+
+ dev_dbg(priv->dev, "Bound %s pad: %d\n", subdev->name, pad);
+
+ return media_create_pad_link(&subdev->entity, pad,
+ &priv->subdev.entity, 0,
+ MEDIA_LNK_FL_ENABLED |
+ MEDIA_LNK_FL_IMMUTABLE);
+}
+
+static void rcar_csi2_notify_unbind(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *subdev,
+ struct v4l2_async_subdev *asd)
+{
+ struct rcar_csi2 *priv = notifier_to_csi2(notifier);
+
+ dev_dbg(priv->dev, "Unbind %s\n", subdev->name);
+}
+
+static const struct v4l2_async_notifier_operations rcar_csi2_notify_ops = {
+ .bound = rcar_csi2_notify_bound,
+ .unbind = rcar_csi2_notify_unbind,
+};
+
+static int rcar_csi2_parse_v4l2(struct rcar_csi2 *priv,
+ struct v4l2_fwnode_endpoint *vep)
+{
+ unsigned int i;
+
+ /* Only port 0 enpoint 0 is valid */
+ if (vep->base.port || vep->base.id)
+ return -ENOTCONN;
+
+ if (vep->bus_type != V4L2_MBUS_CSI2) {
+ dev_err(priv->dev, "Unsupported bus: 0x%x\n", vep->bus_type);
+ return -EINVAL;
+ }
+
+ priv->lanes = vep->bus.mipi_csi2.num_data_lanes;
+ if (priv->lanes != 1 && priv->lanes != 2 && priv->lanes != 4) {
+ dev_err(priv->dev, "Unsupported number of data-lanes: %d\n",
+ priv->lanes);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(priv->lane_swap); i++) {
+ priv->lane_swap[i] = i < priv->lanes ?
+ vep->bus.mipi_csi2.data_lanes[i] : i;
+
+ /* Check for valid lane number */
+ if (priv->lane_swap[i] < 1 || priv->lane_swap[i] > 4) {
+ dev_err(priv->dev, "data-lanes must be in 1-4 range\n");
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static int rcar_csi2_parse_dt(struct rcar_csi2 *priv)
+{
+ struct device_node *ep;
+ struct v4l2_fwnode_endpoint v4l2_ep;
+ int ret;
+
+ ep = of_graph_get_endpoint_by_regs(priv->dev->of_node, 0, 0);
+ if (!ep) {
+ dev_err(priv->dev, "Not connected to subdevice\n");
+ return -EINVAL;
+ }
+
+ ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &v4l2_ep);
+ if (ret) {
+ dev_err(priv->dev, "Could not parse v4l2 endpoint\n");
+ of_node_put(ep);
+ return -EINVAL;
+ }
+
+ ret = rcar_csi2_parse_v4l2(priv, &v4l2_ep);
+ if (ret)
+ return ret;
+
+ priv->remote.match.fwnode.fwnode =
+ fwnode_graph_get_remote_endpoint(of_fwnode_handle(ep));
+ priv->remote.match_type = V4L2_ASYNC_MATCH_FWNODE;
+
+ of_node_put(ep);
+
+ priv->notifier.subdevs = devm_kzalloc(priv->dev,
+ sizeof(*priv->notifier.subdevs),
+ GFP_KERNEL);
+ if (priv->notifier.subdevs == NULL)
+ return -ENOMEM;
+
+ priv->notifier.num_subdevs = 1;
+ priv->notifier.subdevs[0] = &priv->remote;
+ priv->notifier.ops = &rcar_csi2_notify_ops;
+
+ dev_dbg(priv->dev, "Found '%pOF'\n",
+ to_of_node(priv->remote.match.fwnode.fwnode));
+
+ return v4l2_async_subdev_notifier_register(&priv->subdev,
+ &priv->notifier);
+}
+
+/* -----------------------------------------------------------------------------
+ * Platform Device Driver
+ */
+
+static const struct media_entity_operations rcar_csi2_entity_ops = {
+ .link_validate = v4l2_subdev_link_validate,
+};
+
+static int rcar_csi2_probe_resources(struct rcar_csi2 *priv,
+ struct platform_device *pdev)
+{
+ struct resource *res;
+ int irq;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(priv->base))
+ return PTR_ERR(priv->base);
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ return 0;
+}
+
+static const struct rcar_csi2_info rcar_csi2_info_r8a7795 = {
+ .hsfreqrange = hsfreqrange_h3_v3h_m3n,
+ .clear_ulps = true,
+ .have_phtw = true,
+ .csi0clkfreqrange = 0x20,
+};
+
+static const struct rcar_csi2_info rcar_csi2_info_r8a7795es1 = {
+ .hsfreqrange = hsfreqrange_m3w_h3es1,
+};
+
+static const struct rcar_csi2_info rcar_csi2_info_r8a7796 = {
+ .hsfreqrange = hsfreqrange_m3w_h3es1,
+};
+
+static const struct of_device_id rcar_csi2_of_table[] = {
+ {
+ .compatible = "renesas,r8a7795-csi2",
+ .data = &rcar_csi2_info_r8a7795,
+ },
+ {
+ .compatible = "renesas,r8a7796-csi2",
+ .data = &rcar_csi2_info_r8a7796,
+ },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, rcar_csi2_of_table);
+
+static const struct soc_device_attribute r8a7795es1[] = {
+ {
+ .soc_id = "r8a7795", .revision = "ES1.*",
+ .data = &rcar_csi2_info_r8a7795es1,
+ },
+ { /* sentinel */}
+};
+
+static int rcar_csi2_probe(struct platform_device *pdev)
+{
+ const struct soc_device_attribute *attr;
+ struct rcar_csi2 *priv;
+ unsigned int i;
+ int ret;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->info = of_device_get_match_data(&pdev->dev);
+
+ /* r8a7795 ES1.x behaves different then ES2.0+ but no own compat */
+ attr = soc_device_match(r8a7795es1);
+ if (attr)
+ priv->info = attr->data;
+
+ priv->dev = &pdev->dev;
+
+ mutex_init(&priv->lock);
+ priv->stream_count = 0;
+
+ ret = rcar_csi2_probe_resources(priv, pdev);
+ if (ret) {
+ dev_err(priv->dev, "Failed to get resources\n");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, priv);
+
+ ret = rcar_csi2_parse_dt(priv);
+ if (ret)
+ return ret;
+
+ priv->subdev.owner = THIS_MODULE;
+ priv->subdev.dev = &pdev->dev;
+ v4l2_subdev_init(&priv->subdev, &rcar_csi2_subdev_ops);
+ v4l2_set_subdevdata(&priv->subdev, &pdev->dev);
+ snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s %s",
+ KBUILD_MODNAME, dev_name(&pdev->dev));
+ priv->subdev.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
+
+ priv->subdev.entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER;
+ priv->subdev.entity.ops = &rcar_csi2_entity_ops;
+
+ priv->pads[RCAR_CSI2_SINK].flags = MEDIA_PAD_FL_SINK;
+ for (i = RCAR_CSI2_SOURCE_VC0; i < NR_OF_RCAR_CSI2_PAD; i++)
+ priv->pads[i].flags = MEDIA_PAD_FL_SOURCE;
+
+ ret = media_entity_pads_init(&priv->subdev.entity, NR_OF_RCAR_CSI2_PAD,
+ priv->pads);
+ if (ret)
+ goto error;
+
+ ret = v4l2_async_register_subdev(&priv->subdev);
+ if (ret < 0)
+ goto error;
+
+ pm_runtime_enable(&pdev->dev);
+
+ dev_info(priv->dev, "%d lanes found\n", priv->lanes);
+
+ return 0;
+
+error:
+ v4l2_async_notifier_cleanup(&priv->notifier);
+
+ return ret;
+}
+
+static int rcar_csi2_remove(struct platform_device *pdev)
+{
+ struct rcar_csi2 *priv = platform_get_drvdata(pdev);
+
+ v4l2_async_notifier_cleanup(&priv->notifier);
+ v4l2_async_unregister_subdev(&priv->subdev);
+
+ pm_runtime_disable(&pdev->dev);
+
+ return 0;
+}
+
+static struct platform_driver __refdata rcar_csi2_pdrv = {
+ .remove = rcar_csi2_remove,
+ .probe = rcar_csi2_probe,
+ .driver = {
+ .name = "rcar-csi2",
+ .of_match_table = of_match_ptr(rcar_csi2_of_table),
+ },
+};
+
+module_platform_driver(rcar_csi2_pdrv);
+
+MODULE_AUTHOR("Niklas Söderlund <niklas.soderlund@xxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Renesas R-Car MIPI CSI-2 receiver");
+MODULE_LICENSE("GPL v2");
--
2.15.0
--
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