// SPDX-License-Identifier: GPL-2.0 /* * Driver for Xilinx MIPI CSI-2 Rx Subsystem * * Copyright (C) 2016 - 2020 Xilinx, Inc. * * Contacts: Vishal Sagar * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "xilinx-vip.h" /* Register register map */ #define XCSI_CCR_OFFSET 0x00 #define XCSI_CCR_SOFTRESET BIT(1) #define XCSI_CCR_ENABLE BIT(0) #define XCSI_PCR_OFFSET 0x04 #define XCSI_PCR_MAXLANES_MASK GENMASK(4, 3) #define XCSI_PCR_ACTLANES_MASK GENMASK(1, 0) #define XCSI_CSR_OFFSET 0x10 #define XCSI_CSR_PKTCNT GENMASK(31, 16) #define XCSI_CSR_SPFIFOFULL BIT(3) #define XCSI_CSR_SPFIFONE BIT(2) #define XCSI_CSR_SLBF BIT(1) #define XCSI_CSR_RIPCD BIT(0) #define XCSI_GIER_OFFSET 0x20 #define XCSI_GIER_GIE BIT(0) #define XCSI_ISR_OFFSET 0x24 #define XCSI_IER_OFFSET 0x28 #define XCSI_ISR_FR BIT(31) #define XCSI_ISR_VCXFE BIT(30) #define XCSI_ISR_WCC BIT(22) #define XCSI_ISR_ILC BIT(21) #define XCSI_ISR_SPFIFOF BIT(20) #define XCSI_ISR_SPFIFONE BIT(19) #define XCSI_ISR_SLBF BIT(18) #define XCSI_ISR_STOP BIT(17) #define XCSI_ISR_SOTERR BIT(13) #define XCSI_ISR_SOTSYNCERR BIT(12) #define XCSI_ISR_ECC2BERR BIT(11) #define XCSI_ISR_ECC1BERR BIT(10) #define XCSI_ISR_CRCERR BIT(9) #define XCSI_ISR_DATAIDERR BIT(8) #define XCSI_ISR_VC3FSYNCERR BIT(7) #define XCSI_ISR_VC3FLVLERR BIT(6) #define XCSI_ISR_VC2FSYNCERR BIT(5) #define XCSI_ISR_VC2FLVLERR BIT(4) #define XCSI_ISR_VC1FSYNCERR BIT(3) #define XCSI_ISR_VC1FLVLERR BIT(2) #define XCSI_ISR_VC0FSYNCERR BIT(1) #define XCSI_ISR_VC0FLVLERR BIT(0) #define XCSI_ISR_ALLINTR_MASK (0xc07e3fff) /* * Removed VCXFE mask as it doesn't exist in IER * Removed STOP state irq as this will keep driver in irq handler only */ #define XCSI_IER_INTR_MASK (XCSI_ISR_ALLINTR_MASK &\ ~(XCSI_ISR_STOP | XCSI_ISR_VCXFE)) #define XCSI_SPKTR_OFFSET 0x30 #define XCSI_SPKTR_DATA GENMASK(23, 8) #define XCSI_SPKTR_VC GENMASK(7, 6) #define XCSI_SPKTR_DT GENMASK(5, 0) #define XCSI_SPKT_FIFO_DEPTH 31 #define XCSI_VCXR_OFFSET 0x34 #define XCSI_VCXR_VCERR GENMASK(23, 0) #define XCSI_VCXR_FSYNCERR BIT(1) #define XCSI_VCXR_FLVLERR BIT(0) #define XCSI_CLKINFR_OFFSET 0x3C #define XCSI_CLKINFR_STOP BIT(1) #define XCSI_DLXINFR_OFFSET 0x40 #define XCSI_DLXINFR_STOP BIT(5) #define XCSI_DLXINFR_SOTERR BIT(1) #define XCSI_DLXINFR_SOTSYNCERR BIT(0) #define XCSI_MAXDL_COUNT 0x4 #define XCSI_VCXINF1R_OFFSET 0x60 #define XCSI_VCXINF1R_LINECOUNT GENMASK(31, 16) #define XCSI_VCXINF1R_LINECOUNT_SHIFT 16 #define XCSI_VCXINF1R_BYTECOUNT GENMASK(15, 0) #define XCSI_VCXINF2R_OFFSET 0x64 #define XCSI_VCXINF2R_DT GENMASK(5, 0) #define XCSI_MAXVCX_COUNT 16 /* * Sink pad connected to sensor source pad. * Source pad connected to next module like demosaic. */ #define XCSI_MEDIA_PADS 2 #define XCSI_DEFAULT_WIDTH 1920 #define XCSI_DEFAULT_HEIGHT 1080 /* MIPI CSI-2 Data Types from spec */ #define XCSI_DT_YUV4228B 0x1e #define XCSI_DT_YUV42210B 0x1f #define XCSI_DT_RGB444 0x20 #define XCSI_DT_RGB555 0x21 #define XCSI_DT_RGB565 0x22 #define XCSI_DT_RGB666 0x23 #define XCSI_DT_RGB888 0x24 #define XCSI_DT_RAW6 0x28 #define XCSI_DT_RAW7 0x29 #define XCSI_DT_RAW8 0x2a #define XCSI_DT_RAW10 0x2b #define XCSI_DT_RAW12 0x2c #define XCSI_DT_RAW14 0x2d #define XCSI_DT_RAW16 0x2e #define XCSI_DT_RAW20 0x2f #define XCSI_VCX_START 4 #define XCSI_MAX_VC 4 #define XCSI_MAX_VCX 16 #define XCSI_NEXTREG_OFFSET 4 /* There are 2 events frame sync and frame level error per VC */ #define XCSI_VCX_NUM_EVENTS ((XCSI_MAX_VCX - XCSI_MAX_VC) * 2) /** * struct xcsi2rxss_event - Event log structure * @mask: Event mask * @name: Name of the event */ struct xcsi2rxss_event { u32 mask; const char *name; }; static const struct xcsi2rxss_event xcsi2rxss_events[] = { { XCSI_ISR_FR, "Frame Received" }, { XCSI_ISR_VCXFE, "VCX Frame Errors" }, { XCSI_ISR_WCC, "Word Count Errors" }, { XCSI_ISR_ILC, "Invalid Lane Count Error" }, { XCSI_ISR_SPFIFOF, "Short Packet FIFO OverFlow Error" }, { XCSI_ISR_SPFIFONE, "Short Packet FIFO Not Empty" }, { XCSI_ISR_SLBF, "Streamline Buffer Full Error" }, { XCSI_ISR_STOP, "Lane Stop State" }, { XCSI_ISR_SOTERR, "SOT Error" }, { XCSI_ISR_SOTSYNCERR, "SOT Sync Error" }, { XCSI_ISR_ECC2BERR, "2 Bit ECC Unrecoverable Error" }, { XCSI_ISR_ECC1BERR, "1 Bit ECC Recoverable Error" }, { XCSI_ISR_CRCERR, "CRC Error" }, { XCSI_ISR_DATAIDERR, "Data Id Error" }, { XCSI_ISR_VC3FSYNCERR, "Virtual Channel 3 Frame Sync Error" }, { XCSI_ISR_VC3FLVLERR, "Virtual Channel 3 Frame Level Error" }, { XCSI_ISR_VC2FSYNCERR, "Virtual Channel 2 Frame Sync Error" }, { XCSI_ISR_VC2FLVLERR, "Virtual Channel 2 Frame Level Error" }, { XCSI_ISR_VC1FSYNCERR, "Virtual Channel 1 Frame Sync Error" }, { XCSI_ISR_VC1FLVLERR, "Virtual Channel 1 Frame Level Error" }, { XCSI_ISR_VC0FSYNCERR, "Virtual Channel 0 Frame Sync Error" }, { XCSI_ISR_VC0FLVLERR, "Virtual Channel 0 Frame Level Error" } }; #define XCSI_NUM_EVENTS ARRAY_SIZE(xcsi2rxss_events) /* * This table provides a mapping between CSI-2 Data type * and media bus formats */ static const u32 xcsi2dt_mbus_lut[][2] = { { XCSI_DT_YUV4228B, MEDIA_BUS_FMT_UYVY8_1X16 }, { XCSI_DT_YUV42210B, MEDIA_BUS_FMT_UYVY10_1X20 }, { XCSI_DT_RGB444, 0 }, { XCSI_DT_RGB555, 0 }, { XCSI_DT_RGB565, 0 }, { XCSI_DT_RGB666, 0 }, { XCSI_DT_RGB888, MEDIA_BUS_FMT_RBG888_1X24 }, { XCSI_DT_RAW6, 0 }, { XCSI_DT_RAW7, 0 }, { XCSI_DT_RAW8, MEDIA_BUS_FMT_SRGGB8_1X8 }, { XCSI_DT_RAW8, MEDIA_BUS_FMT_SBGGR8_1X8 }, { XCSI_DT_RAW8, MEDIA_BUS_FMT_SGBRG8_1X8 }, { XCSI_DT_RAW8, MEDIA_BUS_FMT_SGRBG8_1X8 }, { XCSI_DT_RAW10, MEDIA_BUS_FMT_SRGGB10_1X10 }, { XCSI_DT_RAW10, MEDIA_BUS_FMT_SBGGR10_1X10 }, { XCSI_DT_RAW10, MEDIA_BUS_FMT_SGBRG10_1X10 }, { XCSI_DT_RAW10, MEDIA_BUS_FMT_SGRBG10_1X10 }, { XCSI_DT_RAW12, MEDIA_BUS_FMT_SRGGB12_1X12 }, { XCSI_DT_RAW12, MEDIA_BUS_FMT_SBGGR12_1X12 }, { XCSI_DT_RAW12, MEDIA_BUS_FMT_SGBRG12_1X12 }, { XCSI_DT_RAW12, MEDIA_BUS_FMT_SGRBG12_1X12 }, { XCSI_DT_RAW16, MEDIA_BUS_FMT_SRGGB16_1X16 }, { XCSI_DT_RAW16, MEDIA_BUS_FMT_SBGGR16_1X16 }, { XCSI_DT_RAW16, MEDIA_BUS_FMT_SGBRG16_1X16 }, { XCSI_DT_RAW16, MEDIA_BUS_FMT_SGRBG16_1X16 }, { XCSI_DT_RAW20, 0 }, }; /** * struct xcsi2rxss_state - CSI-2 Rx Subsystem device structure * @subdev: The v4l2 subdev structure * @format: Active V4L2 formats on each pad * @default_format: Default V4L2 format * @events: counter for events * @vcx_events: counter for vcx_events * @dev: Platform structure * @rsubdev: Remote subdev connected to sink pad * @rst_gpio: reset to video_aresetn * @clks: array of clocks * @iomem: Base address of subsystem * @max_num_lanes: Maximum number of lanes present * @datatype: Data type filter * @lock: mutex for accessing this structure * @pads: media pads * @streaming: Flag for storing streaming state * @enable_active_lanes: If number of active lanes can be modified * @en_vcx: If more than 4 VC are enabled * * This structure contains the device driver related parameters */ struct xcsi2rxss_state { struct v4l2_subdev subdev; struct v4l2_mbus_framefmt format; struct v4l2_mbus_framefmt default_format; u32 events[XCSI_NUM_EVENTS]; u32 vcx_events[XCSI_VCX_NUM_EVENTS]; struct device *dev; struct v4l2_subdev *rsubdev; struct gpio_desc *rst_gpio; struct clk_bulk_data *clks; void __iomem *iomem; u32 max_num_lanes; u32 datatype; /* used to protect access to this struct */ struct mutex lock; struct media_pad pads[XCSI_MEDIA_PADS]; bool streaming; bool enable_active_lanes; bool en_vcx; }; static const struct clk_bulk_data xcsi2rxss_clks[] = { { .id = "lite_aclk" }, { .id = "video_aclk" }, }; static inline struct xcsi2rxss_state * to_xcsi2rxssstate(struct v4l2_subdev *subdev) { return container_of(subdev, struct xcsi2rxss_state, subdev); } /* * Register related operations */ static inline u32 xcsi2rxss_read(struct xcsi2rxss_state *xcsi2rxss, u32 addr) { return ioread32(xcsi2rxss->iomem + addr); } static inline void xcsi2rxss_write(struct xcsi2rxss_state *xcsi2rxss, u32 addr, u32 value) { iowrite32(value, xcsi2rxss->iomem + addr); } static inline void xcsi2rxss_clr(struct xcsi2rxss_state *xcsi2rxss, u32 addr, u32 clr) { xcsi2rxss_write(xcsi2rxss, addr, xcsi2rxss_read(xcsi2rxss, addr) & ~clr); } static inline void xcsi2rxss_set(struct xcsi2rxss_state *xcsi2rxss, u32 addr, u32 set) { xcsi2rxss_write(xcsi2rxss, addr, xcsi2rxss_read(xcsi2rxss, addr) | set); } /* * This function returns the nth mbus for a data type. * In case of error, mbus code returned is 0. */ static u32 xcsi2rxss_get_nth_mbus(u32 dt, u32 n) { unsigned int i; for (i = 0; i < ARRAY_SIZE(xcsi2dt_mbus_lut); i++) { if (xcsi2dt_mbus_lut[i][0] == dt) { if (n-- == 0) return xcsi2dt_mbus_lut[i][1]; } } return 0; } /* This returns the data type for a media bus format else 0 */ static u32 xcsi2rxss_get_dt(u32 mbus) { unsigned int i; for (i = 0; i < ARRAY_SIZE(xcsi2dt_mbus_lut); i++) { if (xcsi2dt_mbus_lut[i][1] == mbus) return xcsi2dt_mbus_lut[i][0]; } return 0; } /** * xcsi2rxss_soft_reset - Does a soft reset of the MIPI CSI-2 Rx Subsystem * @state: Xilinx CSI-2 Rx Subsystem structure pointer * * Core takes less than 100 video clock cycles to reset. * So a larger timeout value is chosen for margin. * * Return: 0 - on success OR -ETIME if reset times out */ static int xcsi2rxss_soft_reset(struct xcsi2rxss_state *state) { u32 timeout = 1000; /* us */ xcsi2rxss_set(state, XCSI_CCR_OFFSET, XCSI_CCR_SOFTRESET); while (xcsi2rxss_read(state, XCSI_CSR_OFFSET) & XCSI_CSR_RIPCD) { if (timeout == 0) { dev_err(state->dev, "soft reset timed out!\n"); return -ETIME; } timeout--; udelay(1); } xcsi2rxss_clr(state, XCSI_CCR_OFFSET, XCSI_CCR_SOFTRESET); return 0; } static void xcsi2rxss_hard_reset(struct xcsi2rxss_state *state) { if (!state->rst_gpio) return; /* minimum of 40 dphy_clk_200M cycles */ gpiod_set_value_cansleep(state->rst_gpio, 1); usleep_range(1, 2); gpiod_set_value_cansleep(state->rst_gpio, 0); } static void xcsi2rxss_reset_event_counters(struct xcsi2rxss_state *state) { unsigned int i; for (i = 0; i < XCSI_NUM_EVENTS; i++) state->events[i] = 0; for (i = 0; i < XCSI_VCX_NUM_EVENTS; i++) state->vcx_events[i] = 0; } /* Print event counters */ static void xcsi2rxss_log_counters(struct xcsi2rxss_state *state) { struct device *dev = state->dev; unsigned int i; for (i = 0; i < XCSI_NUM_EVENTS; i++) { if (state->events[i] > 0) { dev_info(dev, "%s events: %d\n", xcsi2rxss_events[i].name, state->events[i]); } } if (state->en_vcx) { for (i = 0; i < XCSI_VCX_NUM_EVENTS; i++) { if (state->vcx_events[i] > 0) { dev_info(dev, "VC %d Frame %s err vcx events: %d\n", (i / 2) + XCSI_VCX_START, i & 1 ? "Sync" : "Level", state->vcx_events[i]); } } } } /** * xcsi2rxss_log_status - Logs the status of the CSI-2 Receiver * @sd: Pointer to V4L2 subdevice structure * * This function prints the current status of Xilinx MIPI CSI-2 * * Return: 0 on success */ static int xcsi2rxss_log_status(struct v4l2_subdev *sd) { struct xcsi2rxss_state *xcsi2rxss = to_xcsi2rxssstate(sd); struct device *dev = xcsi2rxss->dev; u32 reg, data; unsigned int i, max_vc; mutex_lock(&xcsi2rxss->lock); xcsi2rxss_log_counters(xcsi2rxss); dev_info(dev, "***** Core Status *****\n"); data = xcsi2rxss_read(xcsi2rxss, XCSI_CSR_OFFSET); dev_info(dev, "Short Packet FIFO Full = %s\n", data & XCSI_CSR_SPFIFOFULL ? "true" : "false"); dev_info(dev, "Short Packet FIFO Not Empty = %s\n", data & XCSI_CSR_SPFIFONE ? "true" : "false"); dev_info(dev, "Stream line buffer full = %s\n", data & XCSI_CSR_SLBF ? "true" : "false"); dev_info(dev, "Soft reset/Core disable in progress = %s\n", data & XCSI_CSR_RIPCD ? "true" : "false"); /* Clk & Lane Info */ dev_info(dev, "******** Clock Lane Info *********\n"); data = xcsi2rxss_read(xcsi2rxss, XCSI_CLKINFR_OFFSET); dev_info(dev, "Clock Lane in Stop State = %s\n", data & XCSI_CLKINFR_STOP ? "true" : "false"); dev_info(dev, "******** Data Lane Info *********\n"); dev_info(dev, "Lane\tSoT Error\tSoT Sync Error\tStop State\n"); reg = XCSI_DLXINFR_OFFSET; for (i = 0; i < XCSI_MAXDL_COUNT; i++) { data = xcsi2rxss_read(xcsi2rxss, reg); dev_info(dev, "%d\t%s\t\t%s\t\t%s\n", i, data & XCSI_DLXINFR_SOTERR ? "true" : "false", data & XCSI_DLXINFR_SOTSYNCERR ? "true" : "false", data & XCSI_DLXINFR_STOP ? "true" : "false"); reg += XCSI_NEXTREG_OFFSET; } /* Virtual Channel Image Information */ dev_info(dev, "********** Virtual Channel Info ************\n"); dev_info(dev, "VC\tLine Count\tByte Count\tData Type\n"); if (xcsi2rxss->en_vcx) max_vc = XCSI_MAX_VCX; else max_vc = XCSI_MAX_VC; reg = XCSI_VCXINF1R_OFFSET; for (i = 0; i < max_vc; i++) { u32 line_count, byte_count, data_type; /* Get line and byte count from VCXINFR1 Register */ data = xcsi2rxss_read(xcsi2rxss, reg); byte_count = data & XCSI_VCXINF1R_BYTECOUNT; line_count = data & XCSI_VCXINF1R_LINECOUNT; line_count >>= XCSI_VCXINF1R_LINECOUNT_SHIFT; /* Get data type from VCXINFR2 Register */ reg += XCSI_NEXTREG_OFFSET; data = xcsi2rxss_read(xcsi2rxss, reg); data_type = data & XCSI_VCXINF2R_DT; dev_info(dev, "%d\t%d\t\t%d\t\t0x%x\n", i, line_count, byte_count, data_type); /* Move to next pair of VC Info registers */ reg += XCSI_NEXTREG_OFFSET; } mutex_unlock(&xcsi2rxss->lock); return 0; } static struct v4l2_subdev *xcsi2rxss_get_remote_subdev(struct media_pad *local) { struct media_pad *remote; remote = media_entity_remote_pad(local); if (!remote || !is_media_entity_v4l2_subdev(remote->entity)) return NULL; return media_entity_to_v4l2_subdev(remote->entity); } static int xcsi2rxss_start_stream(struct xcsi2rxss_state *state) { int ret = 0; /* enable core */ xcsi2rxss_set(state, XCSI_CCR_OFFSET, XCSI_CCR_ENABLE); ret = xcsi2rxss_soft_reset(state); if (ret) { state->streaming = false; return ret; } /* enable interrupts */ xcsi2rxss_clr(state, XCSI_GIER_OFFSET, XCSI_GIER_GIE); xcsi2rxss_write(state, XCSI_IER_OFFSET, XCSI_IER_INTR_MASK); xcsi2rxss_set(state, XCSI_GIER_OFFSET, XCSI_GIER_GIE); state->streaming = true; state->rsubdev = xcsi2rxss_get_remote_subdev(&state->pads[XVIP_PAD_SINK]); ret = v4l2_subdev_call(state->rsubdev, video, s_stream, 1); if (ret) { /* disable interrupts */ xcsi2rxss_clr(state, XCSI_IER_OFFSET, XCSI_IER_INTR_MASK); xcsi2rxss_clr(state, XCSI_GIER_OFFSET, XCSI_GIER_GIE); /* disable core */ xcsi2rxss_clr(state, XCSI_CCR_OFFSET, XCSI_CCR_ENABLE); state->streaming = false; } return ret; } static void xcsi2rxss_stop_stream(struct xcsi2rxss_state *state) { v4l2_subdev_call(state->rsubdev, video, s_stream, 0); /* disable interrupts */ xcsi2rxss_clr(state, XCSI_IER_OFFSET, XCSI_IER_INTR_MASK); xcsi2rxss_clr(state, XCSI_GIER_OFFSET, XCSI_GIER_GIE); /* disable core */ xcsi2rxss_clr(state, XCSI_CCR_OFFSET, XCSI_CCR_ENABLE); state->streaming = false; } /** * xcsi2rxss_irq_handler - Interrupt handler for CSI-2 * @irq: IRQ number * @data: Pointer to device state * * In the interrupt handler, a list of event counters are updated for * corresponding interrupts. This is useful to get status / debug. * * Return: IRQ_HANDLED after handling interrupts */ static irqreturn_t xcsi2rxss_irq_handler(int irq, void *data) { struct xcsi2rxss_state *state = (struct xcsi2rxss_state *)data; struct device *dev = state->dev; u32 status; status = xcsi2rxss_read(state, XCSI_ISR_OFFSET) & XCSI_ISR_ALLINTR_MASK; xcsi2rxss_write(state, XCSI_ISR_OFFSET, status); /* Received a short packet */ if (status & XCSI_ISR_SPFIFONE) { u32 count = 0; /* * Drain generic short packet FIFO by reading max 31 * (fifo depth) short packets from fifo or till fifo is empty. */ for (count = 0; count < XCSI_SPKT_FIFO_DEPTH; ++count) { u32 spfifostat, spkt; spkt = xcsi2rxss_read(state, XCSI_SPKTR_OFFSET); dev_dbg(dev, "Short packet = 0x%08x\n", spkt); spfifostat = xcsi2rxss_read(state, XCSI_ISR_OFFSET); spfifostat &= XCSI_ISR_SPFIFONE; if (!spfifostat) break; xcsi2rxss_write(state, XCSI_ISR_OFFSET, spfifostat); } } /* Short packet FIFO overflow */ if (status & XCSI_ISR_SPFIFOF) dev_dbg_ratelimited(dev, "Short packet FIFO overflowed\n"); /* * Stream line buffer full * This means there is a backpressure from downstream IP */ if (status & XCSI_ISR_SLBF) { dev_alert_ratelimited(dev, "Stream Line Buffer Full!\n"); /* disable interrupts */ xcsi2rxss_clr(state, XCSI_IER_OFFSET, XCSI_IER_INTR_MASK); xcsi2rxss_clr(state, XCSI_GIER_OFFSET, XCSI_GIER_GIE); /* disable core */ xcsi2rxss_clr(state, XCSI_CCR_OFFSET, XCSI_CCR_ENABLE); /* * The IP needs to be hard reset before it can be used now. * This will be done in streamoff. */ /* * TODO: Notify the whole pipeline with v4l2_subdev_notify() to * inform userspace. */ } /* Increment event counters */ if (status & XCSI_ISR_ALLINTR_MASK) { unsigned int i; for (i = 0; i < XCSI_NUM_EVENTS; i++) { if (!(status & xcsi2rxss_events[i].mask)) continue; state->events[i]++; dev_dbg_ratelimited(dev, "%s: %u\n", xcsi2rxss_events[i].name, state->events[i]); } if (status & XCSI_ISR_VCXFE && state->en_vcx) { u32 vcxstatus; vcxstatus = xcsi2rxss_read(state, XCSI_VCXR_OFFSET); vcxstatus &= XCSI_VCXR_VCERR; for (i = 0; i < XCSI_VCX_NUM_EVENTS; i++) { if (!(vcxstatus & BIT(i))) continue; state->vcx_events[i]++; } xcsi2rxss_write(state, XCSI_VCXR_OFFSET, vcxstatus); } } return IRQ_HANDLED; } /** * xcsi2rxss_s_stream - It is used to start/stop the streaming. * @sd: V4L2 Sub device * @enable: Flag (True / False) * * This function controls the start or stop of streaming for the * Xilinx MIPI CSI-2 Rx Subsystem. * * Return: 0 on success, errors otherwise */ static int xcsi2rxss_s_stream(struct v4l2_subdev *sd, int enable) { struct xcsi2rxss_state *xcsi2rxss = to_xcsi2rxssstate(sd); int ret = 0; mutex_lock(&xcsi2rxss->lock); if (enable == xcsi2rxss->streaming) goto stream_done; if (enable) { xcsi2rxss_reset_event_counters(xcsi2rxss); ret = xcsi2rxss_start_stream(xcsi2rxss); } else { xcsi2rxss_stop_stream(xcsi2rxss); xcsi2rxss_hard_reset(xcsi2rxss); } stream_done: mutex_unlock(&xcsi2rxss->lock); return ret; } static struct v4l2_mbus_framefmt * __xcsi2rxss_get_pad_format(struct xcsi2rxss_state *xcsi2rxss, struct v4l2_subdev_pad_config *cfg, unsigned int pad, u32 which) { switch (which) { case V4L2_SUBDEV_FORMAT_TRY: return v4l2_subdev_get_try_format(&xcsi2rxss->subdev, cfg, pad); case V4L2_SUBDEV_FORMAT_ACTIVE: return &xcsi2rxss->format; default: return NULL; } } /** * xcsi2rxss_init_cfg - Initialise the pad format config to default * @sd: Pointer to V4L2 Sub device structure * @cfg: Pointer to sub device pad information structure * * This function is used to initialize the pad format with the default * values. * * Return: 0 on success */ static int xcsi2rxss_init_cfg(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg) { struct xcsi2rxss_state *xcsi2rxss = to_xcsi2rxssstate(sd); struct v4l2_mbus_framefmt *format; unsigned int i; mutex_lock(&xcsi2rxss->lock); for (i = 0; i < XCSI_MEDIA_PADS; i++) { format = v4l2_subdev_get_try_format(sd, cfg, i); *format = xcsi2rxss->default_format; } mutex_unlock(&xcsi2rxss->lock); return 0; } /** * xcsi2rxss_get_format - Get the pad format * @sd: Pointer to V4L2 Sub device structure * @cfg: Pointer to sub device pad information structure * @fmt: Pointer to pad level media bus format * * This function is used to get the pad format information. * * Return: 0 on success */ static int xcsi2rxss_get_format(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg, struct v4l2_subdev_format *fmt) { struct xcsi2rxss_state *xcsi2rxss = to_xcsi2rxssstate(sd); mutex_lock(&xcsi2rxss->lock); fmt->format = *__xcsi2rxss_get_pad_format(xcsi2rxss, cfg, fmt->pad, fmt->which); mutex_unlock(&xcsi2rxss->lock); return 0; } /** * xcsi2rxss_set_format - This is used to set the pad format * @sd: Pointer to V4L2 Sub device structure * @cfg: Pointer to sub device pad information structure * @fmt: Pointer to pad level media bus format * * This function is used to set the pad format. Since the pad format is fixed * in hardware, it can't be modified on run time. So when a format set is * requested by application, all parameters except the format type is saved * for the pad and the original pad format is sent back to the application. * * Return: 0 on success */ static int xcsi2rxss_set_format(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg, struct v4l2_subdev_format *fmt) { struct xcsi2rxss_state *xcsi2rxss = to_xcsi2rxssstate(sd); struct v4l2_mbus_framefmt *__format; u32 dt; mutex_lock(&xcsi2rxss->lock); /* * Only the format->code parameter matters for CSI as the * CSI format cannot be changed at runtime. * Ensure that format to set is copied to over to CSI pad format */ __format = __xcsi2rxss_get_pad_format(xcsi2rxss, cfg, fmt->pad, fmt->which); /* only sink pad format can be updated */ if (fmt->pad == XVIP_PAD_SOURCE) { fmt->format = *__format; mutex_unlock(&xcsi2rxss->lock); return 0; } /* * RAW8 is supported in all datatypes. So if requested media bus format * is of RAW8 type, then allow to be set. In case core is configured to * other RAW, YUV422 8/10 or RGB888, set appropriate media bus format. */ dt = xcsi2rxss_get_dt(fmt->format.code); if (dt != xcsi2rxss->datatype && dt != XCSI_DT_RAW8) { dev_dbg(xcsi2rxss->dev, "Unsupported media bus format"); /* set the default format for the data type */ fmt->format.code = xcsi2rxss_get_nth_mbus(xcsi2rxss->datatype, 0); } *__format = fmt->format; mutex_unlock(&xcsi2rxss->lock); return 0; } /* * xcsi2rxss_enum_mbus_code - Handle pixel format enumeration * @sd: pointer to v4l2 subdev structure * @cfg: V4L2 subdev pad configuration * @code: pointer to v4l2_subdev_mbus_code_enum structure * * Return: -EINVAL or zero on success */ static int xcsi2rxss_enum_mbus_code(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg, struct v4l2_subdev_mbus_code_enum *code) { struct xcsi2rxss_state *state = to_xcsi2rxssstate(sd); u32 dt, n; int ret = 0; /* RAW8 dt packets are available in all DT configurations */ if (code->index < 4) { n = code->index; dt = XCSI_DT_RAW8; } else if (state->datatype != XCSI_DT_RAW8) { n = code->index - 4; dt = state->datatype; } else { return -EINVAL; } code->code = xcsi2rxss_get_nth_mbus(dt, n); if (!code->code) ret = -EINVAL; return ret; } /* ----------------------------------------------------------------------------- * Media Operations */ static const struct media_entity_operations xcsi2rxss_media_ops = { .link_validate = v4l2_subdev_link_validate }; static const struct v4l2_subdev_core_ops xcsi2rxss_core_ops = { .log_status = xcsi2rxss_log_status, }; static const struct v4l2_subdev_video_ops xcsi2rxss_video_ops = { .s_stream = xcsi2rxss_s_stream }; static const struct v4l2_subdev_pad_ops xcsi2rxss_pad_ops = { .init_cfg = xcsi2rxss_init_cfg, .get_fmt = xcsi2rxss_get_format, .set_fmt = xcsi2rxss_set_format, .enum_mbus_code = xcsi2rxss_enum_mbus_code, .link_validate = v4l2_subdev_link_validate_default, }; static const struct v4l2_subdev_ops xcsi2rxss_ops = { .core = &xcsi2rxss_core_ops, .video = &xcsi2rxss_video_ops, .pad = &xcsi2rxss_pad_ops }; static int xcsi2rxss_parse_of(struct xcsi2rxss_state *xcsi2rxss) { struct device *dev = xcsi2rxss->dev; struct device_node *node = dev->of_node; struct fwnode_handle *ep; struct v4l2_fwnode_endpoint vep = { .bus_type = V4L2_MBUS_CSI2_DPHY }; bool en_csi_v20, vfb; int ret; en_csi_v20 = of_property_read_bool(node, "xlnx,en-csi-v2-0"); if (en_csi_v20) xcsi2rxss->en_vcx = of_property_read_bool(node, "xlnx,en-vcx"); xcsi2rxss->enable_active_lanes = of_property_read_bool(node, "xlnx,en-active-lanes"); ret = of_property_read_u32(node, "xlnx,csi-pxl-format", &xcsi2rxss->datatype); if (ret < 0) { dev_err(dev, "missing xlnx,csi-pxl-format property\n"); return ret; } switch (xcsi2rxss->datatype) { case XCSI_DT_YUV4228B: case XCSI_DT_RGB444: case XCSI_DT_RGB555: case XCSI_DT_RGB565: case XCSI_DT_RGB666: case XCSI_DT_RGB888: case XCSI_DT_RAW6: case XCSI_DT_RAW7: case XCSI_DT_RAW8: case XCSI_DT_RAW10: case XCSI_DT_RAW12: case XCSI_DT_RAW14: break; case XCSI_DT_YUV42210B: case XCSI_DT_RAW16: case XCSI_DT_RAW20: if (!en_csi_v20) { ret = -EINVAL; dev_dbg(dev, "enable csi v2 for this pixel format"); } break; default: ret = -EINVAL; } if (ret < 0) { dev_err(dev, "invalid csi-pxl-format property!\n"); return ret; } vfb = of_property_read_bool(node, "xlnx,vfb"); if (!vfb) { dev_err(dev, "operation without VFB is not supported\n"); return -EINVAL; } ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), XVIP_PAD_SINK, 0, FWNODE_GRAPH_ENDPOINT_NEXT); if (!ep) { dev_err(dev, "no sink port found"); return -EINVAL; } ret = v4l2_fwnode_endpoint_parse(ep, &vep); fwnode_handle_put(ep); if (ret) { dev_err(dev, "error parsing sink port"); return ret; } dev_dbg(dev, "mipi number lanes = %d\n", vep.bus.mipi_csi2.num_data_lanes); xcsi2rxss->max_num_lanes = vep.bus.mipi_csi2.num_data_lanes; ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), XVIP_PAD_SOURCE, 0, FWNODE_GRAPH_ENDPOINT_NEXT); if (!ep) { dev_err(dev, "no source port found"); return -EINVAL; } fwnode_handle_put(ep); dev_dbg(dev, "vcx %s, %u data lanes (%s), data type 0x%02x\n", xcsi2rxss->en_vcx ? "enabled" : "disabled", xcsi2rxss->max_num_lanes, xcsi2rxss->enable_active_lanes ? "dynamic" : "static", xcsi2rxss->datatype); return 0; } static int xcsi2rxss_probe(struct platform_device *pdev) { struct v4l2_subdev *subdev; struct xcsi2rxss_state *xcsi2rxss; int num_clks = ARRAY_SIZE(xcsi2rxss_clks); struct device *dev = &pdev->dev; int irq, ret; xcsi2rxss = devm_kzalloc(dev, sizeof(*xcsi2rxss), GFP_KERNEL); if (!xcsi2rxss) return -ENOMEM; xcsi2rxss->dev = dev; xcsi2rxss->clks = devm_kmemdup(dev, xcsi2rxss_clks, sizeof(xcsi2rxss_clks), GFP_KERNEL); if (!xcsi2rxss->clks) return -ENOMEM; /* Reset GPIO */ xcsi2rxss->rst_gpio = devm_gpiod_get_optional(dev, "video-reset", GPIOD_OUT_HIGH); if (IS_ERR(xcsi2rxss->rst_gpio)) { if (PTR_ERR(xcsi2rxss->rst_gpio) != -EPROBE_DEFER) dev_err(dev, "Video Reset GPIO not setup in DT"); return PTR_ERR(xcsi2rxss->rst_gpio); } ret = xcsi2rxss_parse_of(xcsi2rxss); if (ret < 0) return ret; xcsi2rxss->iomem = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(xcsi2rxss->iomem)) return PTR_ERR(xcsi2rxss->iomem); irq = platform_get_irq(pdev, 0); if (irq < 0) return irq; ret = devm_request_threaded_irq(dev, irq, NULL, xcsi2rxss_irq_handler, IRQF_ONESHOT, dev_name(dev), xcsi2rxss); if (ret) { dev_err(dev, "Err = %d Interrupt handler reg failed!\n", ret); return ret; } ret = clk_bulk_get(dev, num_clks, xcsi2rxss->clks); if (ret) return ret; /* TODO: Enable/disable clocks at stream on/off time. */ ret = clk_bulk_prepare_enable(num_clks, xcsi2rxss->clks); if (ret) goto err_clk_put; mutex_init(&xcsi2rxss->lock); xcsi2rxss_hard_reset(xcsi2rxss); xcsi2rxss_soft_reset(xcsi2rxss); /* Initialize V4L2 subdevice and media entity */ xcsi2rxss->pads[XVIP_PAD_SINK].flags = MEDIA_PAD_FL_SINK; xcsi2rxss->pads[XVIP_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE; /* Initialize the default format */ xcsi2rxss->default_format.code = xcsi2rxss_get_nth_mbus(xcsi2rxss->datatype, 0); xcsi2rxss->default_format.field = V4L2_FIELD_NONE; xcsi2rxss->default_format.colorspace = V4L2_COLORSPACE_SRGB; xcsi2rxss->default_format.width = XCSI_DEFAULT_WIDTH; xcsi2rxss->default_format.height = XCSI_DEFAULT_HEIGHT; xcsi2rxss->format = xcsi2rxss->default_format; /* Initialize V4L2 subdevice and media entity */ subdev = &xcsi2rxss->subdev; v4l2_subdev_init(subdev, &xcsi2rxss_ops); subdev->dev = dev; strscpy(subdev->name, dev_name(dev), sizeof(subdev->name)); subdev->flags |= V4L2_SUBDEV_FL_HAS_EVENTS | V4L2_SUBDEV_FL_HAS_DEVNODE; subdev->entity.ops = &xcsi2rxss_media_ops; v4l2_set_subdevdata(subdev, xcsi2rxss); ret = media_entity_pads_init(&subdev->entity, XCSI_MEDIA_PADS, xcsi2rxss->pads); if (ret < 0) goto error; platform_set_drvdata(pdev, xcsi2rxss); ret = v4l2_async_register_subdev(subdev); if (ret < 0) { dev_err(dev, "failed to register subdev\n"); goto error; } return 0; error: media_entity_cleanup(&subdev->entity); mutex_destroy(&xcsi2rxss->lock); clk_bulk_disable_unprepare(num_clks, xcsi2rxss->clks); err_clk_put: clk_bulk_put(num_clks, xcsi2rxss->clks); return ret; } static int xcsi2rxss_remove(struct platform_device *pdev) { struct xcsi2rxss_state *xcsi2rxss = platform_get_drvdata(pdev); struct v4l2_subdev *subdev = &xcsi2rxss->subdev; int num_clks = ARRAY_SIZE(xcsi2rxss_clks); v4l2_async_unregister_subdev(subdev); media_entity_cleanup(&subdev->entity); mutex_destroy(&xcsi2rxss->lock); clk_bulk_disable_unprepare(num_clks, xcsi2rxss->clks); clk_bulk_put(num_clks, xcsi2rxss->clks); return 0; } static const struct of_device_id xcsi2rxss_of_id_table[] = { { .compatible = "xlnx,mipi-csi2-rx-subsystem-5.0", }, { } }; MODULE_DEVICE_TABLE(of, xcsi2rxss_of_id_table); static struct platform_driver xcsi2rxss_driver = { .driver = { .name = "xilinx-csi2rxss", .of_match_table = xcsi2rxss_of_id_table, }, .probe = xcsi2rxss_probe, .remove = xcsi2rxss_remove, }; module_platform_driver(xcsi2rxss_driver); MODULE_AUTHOR("Vishal Sagar "); MODULE_DESCRIPTION("Xilinx MIPI CSI-2 Rx Subsystem Driver"); MODULE_LICENSE("GPL v2");