diff options
Diffstat (limited to 'drivers/staging/media/imx/imx7-mipi-csis.c')
| -rw-r--r-- | drivers/staging/media/imx/imx7-mipi-csis.c | 1160 |
1 files changed, 1160 insertions, 0 deletions
diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c new file mode 100644 index 000000000000..2ddcc42ab8ff --- /dev/null +++ b/drivers/staging/media/imx/imx7-mipi-csis.c @@ -0,0 +1,1160 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Freescale i.MX7 SoC series MIPI-CSI V3.3 receiver driver + * + * Copyright (C) 2019 Linaro Ltd + * Copyright (C) 2015-2016 Freescale Semiconductor, Inc. All Rights Reserved. + * Copyright (C) 2011 - 2013 Samsung Electronics Co., Ltd. + * + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/kernel.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of_graph.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/reset.h> +#include <linux/regulator/consumer.h> +#include <linux/spinlock.h> + +#include <media/v4l2-device.h> +#include <media/v4l2-fwnode.h> +#include <media/v4l2-subdev.h> + +#include "imx-media.h" + +#define CSIS_DRIVER_NAME "imx7-mipi-csis" +#define CSIS_SUBDEV_NAME CSIS_DRIVER_NAME + +#define CSIS_PAD_SINK 0 +#define CSIS_PAD_SOURCE 1 +#define CSIS_PADS_NUM 2 + +#define MIPI_CSIS_DEF_PIX_WIDTH 640 +#define MIPI_CSIS_DEF_PIX_HEIGHT 480 + +/* Register map definition */ + +/* CSIS common control */ +#define MIPI_CSIS_CMN_CTRL 0x04 +#define MIPI_CSIS_CMN_CTRL_UPDATE_SHADOW BIT(16) +#define MIPI_CSIS_CMN_CTRL_INTER_MODE BIT(10) +#define MIPI_CSIS_CMN_CTRL_UPDATE_SHADOW_CTRL BIT(2) +#define MIPI_CSIS_CMN_CTRL_RESET BIT(1) +#define MIPI_CSIS_CMN_CTRL_ENABLE BIT(0) + +#define MIPI_CSIS_CMN_CTRL_LANE_NR_OFFSET 8 +#define MIPI_CSIS_CMN_CTRL_LANE_NR_MASK (3 << 8) + +/* CSIS clock control */ +#define MIPI_CSIS_CLK_CTRL 0x08 +#define MIPI_CSIS_CLK_CTRL_CLKGATE_TRAIL_CH3(x) ((x) << 28) +#define MIPI_CSIS_CLK_CTRL_CLKGATE_TRAIL_CH2(x) ((x) << 24) +#define MIPI_CSIS_CLK_CTRL_CLKGATE_TRAIL_CH1(x) ((x) << 20) +#define MIPI_CSIS_CLK_CTRL_CLKGATE_TRAIL_CH0(x) ((x) << 16) +#define MIPI_CSIS_CLK_CTRL_CLKGATE_EN_MSK (0xf << 4) +#define MIPI_CSIS_CLK_CTRL_WCLK_SRC BIT(0) + +/* CSIS Interrupt mask */ +#define MIPI_CSIS_INTMSK 0x10 +#define MIPI_CSIS_INTMSK_EVEN_BEFORE BIT(31) +#define MIPI_CSIS_INTMSK_EVEN_AFTER BIT(30) +#define MIPI_CSIS_INTMSK_ODD_BEFORE BIT(29) +#define MIPI_CSIS_INTMSK_ODD_AFTER BIT(28) +#define MIPI_CSIS_INTMSK_FRAME_START BIT(24) +#define MIPI_CSIS_INTMSK_FRAME_END BIT(20) +#define MIPI_CSIS_INTMSK_ERR_SOT_HS BIT(16) +#define MIPI_CSIS_INTMSK_ERR_LOST_FS BIT(12) +#define MIPI_CSIS_INTMSK_ERR_LOST_FE BIT(8) +#define MIPI_CSIS_INTMSK_ERR_OVER BIT(4) +#define MIPI_CSIS_INTMSK_ERR_WRONG_CFG BIT(3) +#define MIPI_CSIS_INTMSK_ERR_ECC BIT(2) +#define MIPI_CSIS_INTMSK_ERR_CRC BIT(1) +#define MIPI_CSIS_INTMSK_ERR_UNKNOWN BIT(0) + +/* CSIS Interrupt source */ +#define MIPI_CSIS_INTSRC 0x14 +#define MIPI_CSIS_INTSRC_EVEN_BEFORE BIT(31) +#define MIPI_CSIS_INTSRC_EVEN_AFTER BIT(30) +#define MIPI_CSIS_INTSRC_EVEN BIT(30) +#define MIPI_CSIS_INTSRC_ODD_BEFORE BIT(29) +#define MIPI_CSIS_INTSRC_ODD_AFTER BIT(28) +#define MIPI_CSIS_INTSRC_ODD (0x3 << 28) +#define MIPI_CSIS_INTSRC_NON_IMAGE_DATA (0xf << 28) +#define MIPI_CSIS_INTSRC_FRAME_START BIT(24) +#define MIPI_CSIS_INTSRC_FRAME_END BIT(20) +#define MIPI_CSIS_INTSRC_ERR_SOT_HS BIT(16) +#define MIPI_CSIS_INTSRC_ERR_LOST_FS BIT(12) +#define MIPI_CSIS_INTSRC_ERR_LOST_FE BIT(8) +#define MIPI_CSIS_INTSRC_ERR_OVER BIT(4) +#define MIPI_CSIS_INTSRC_ERR_WRONG_CFG BIT(3) +#define MIPI_CSIS_INTSRC_ERR_ECC BIT(2) +#define MIPI_CSIS_INTSRC_ERR_CRC BIT(1) +#define MIPI_CSIS_INTSRC_ERR_UNKNOWN BIT(0) +#define MIPI_CSIS_INTSRC_ERRORS 0xfffff + +/* D-PHY status control */ +#define MIPI_CSIS_DPHYSTATUS 0x20 +#define MIPI_CSIS_DPHYSTATUS_ULPS_DAT BIT(8) +#define MIPI_CSIS_DPHYSTATUS_STOPSTATE_DAT BIT(4) +#define MIPI_CSIS_DPHYSTATUS_ULPS_CLK BIT(1) +#define MIPI_CSIS_DPHYSTATUS_STOPSTATE_CLK BIT(0) + +/* D-PHY common control */ +#define MIPI_CSIS_DPHYCTRL 0x24 +#define MIPI_CSIS_DPHYCTRL_HSS_MASK (0xff << 24) +#define MIPI_CSIS_DPHYCTRL_HSS_OFFSET 24 +#define MIPI_CSIS_DPHYCTRL_SCLKS_MASK (0x3 << 22) +#define MIPI_CSIS_DPHYCTRL_SCLKS_OFFSET 22 +#define MIPI_CSIS_DPHYCTRL_DPDN_SWAP_CLK BIT(6) +#define MIPI_CSIS_DPHYCTRL_DPDN_SWAP_DAT BIT(5) +#define MIPI_CSIS_DPHYCTRL_ENABLE_DAT BIT(1) +#define MIPI_CSIS_DPHYCTRL_ENABLE_CLK BIT(0) +#define MIPI_CSIS_DPHYCTRL_ENABLE (0x1f << 0) + +/* D-PHY Master and Slave Control register Low */ +#define MIPI_CSIS_DPHYBCTRL_L 0x30 +/* D-PHY Master and Slave Control register High */ +#define MIPI_CSIS_DPHYBCTRL_H 0x34 +/* D-PHY Slave Control register Low */ +#define MIPI_CSIS_DPHYSCTRL_L 0x38 +/* D-PHY Slave Control register High */ +#define MIPI_CSIS_DPHYSCTRL_H 0x3c + +/* ISP Configuration register */ +#define MIPI_CSIS_ISPCONFIG_CH0 0x40 +#define MIPI_CSIS_ISPCONFIG_CH1 0x50 +#define MIPI_CSIS_ISPCONFIG_CH2 0x60 +#define MIPI_CSIS_ISPCONFIG_CH3 0x70 + +#define MIPI_CSIS_ISPCFG_MEM_FULL_GAP_MSK (0xff << 24) +#define MIPI_CSIS_ISPCFG_MEM_FULL_GAP(x) ((x) << 24) +#define MIPI_CSIS_ISPCFG_DOUBLE_CMPNT BIT(12) +#define MIPI_CSIS_ISPCFG_ALIGN_32BIT BIT(11) +#define MIPI_CSIS_ISPCFG_FMT_YCBCR422_8BIT (0x1e << 2) +#define MIPI_CSIS_ISPCFG_FMT_RAW8 (0x2a << 2) +#define MIPI_CSIS_ISPCFG_FMT_RAW10 (0x2b << 2) +#define MIPI_CSIS_ISPCFG_FMT_RAW12 (0x2c << 2) + +/* User defined formats, x = 1...4 */ +#define MIPI_CSIS_ISPCFG_FMT_USER(x) ((0x30 + (x) - 1) << 2) +#define MIPI_CSIS_ISPCFG_FMT_MASK (0x3f << 2) + +/* ISP Image Resolution register */ +#define MIPI_CSIS_ISPRESOL_CH0 0x44 +#define MIPI_CSIS_ISPRESOL_CH1 0x54 +#define MIPI_CSIS_ISPRESOL_CH2 0x64 +#define MIPI_CSIS_ISPRESOL_CH3 0x74 +#define CSIS_MAX_PIX_WIDTH 0xffff +#define CSIS_MAX_PIX_HEIGHT 0xffff + +/* ISP SYNC register */ +#define MIPI_CSIS_ISPSYNC_CH0 0x48 +#define MIPI_CSIS_ISPSYNC_CH1 0x58 +#define MIPI_CSIS_ISPSYNC_CH2 0x68 +#define MIPI_CSIS_ISPSYNC_CH3 0x78 + +#define MIPI_CSIS_ISPSYNC_HSYNC_LINTV_OFFSET 18 +#define MIPI_CSIS_ISPSYNC_VSYNC_SINTV_OFFSET 12 +#define MIPI_CSIS_ISPSYNC_VSYNC_EINTV_OFFSET 0 + +/* Non-image packet data buffers */ +#define MIPI_CSIS_PKTDATA_ODD 0x2000 +#define MIPI_CSIS_PKTDATA_EVEN 0x3000 +#define MIPI_CSIS_PKTDATA_SIZE SZ_4K + +#define DEFAULT_SCLK_CSIS_FREQ 166000000UL + +enum { + ST_POWERED = 1, + ST_STREAMING = 2, + ST_SUSPENDED = 4, +}; + +struct mipi_csis_event { + u32 mask; + const char * const name; + unsigned int counter; +}; + +static const struct mipi_csis_event mipi_csis_events[] = { + /* Errors */ + { MIPI_CSIS_INTSRC_ERR_SOT_HS, "SOT Error" }, + { MIPI_CSIS_INTSRC_ERR_LOST_FS, "Lost Frame Start Error" }, + { MIPI_CSIS_INTSRC_ERR_LOST_FE, "Lost Frame End Error" }, + { MIPI_CSIS_INTSRC_ERR_OVER, "FIFO Overflow Error" }, + { MIPI_CSIS_INTSRC_ERR_WRONG_CFG, "Wrong Configuration Error" }, + { MIPI_CSIS_INTSRC_ERR_ECC, "ECC Error" }, + { MIPI_CSIS_INTSRC_ERR_CRC, "CRC Error" }, + { MIPI_CSIS_INTSRC_ERR_UNKNOWN, "Unknown Error" }, + /* Non-image data receive events */ + { MIPI_CSIS_INTSRC_EVEN_BEFORE, "Non-image data before even frame" }, + { MIPI_CSIS_INTSRC_EVEN_AFTER, "Non-image data after even frame" }, + { MIPI_CSIS_INTSRC_ODD_BEFORE, "Non-image data before odd frame" }, + { MIPI_CSIS_INTSRC_ODD_AFTER, "Non-image data after odd frame" }, + /* Frame start/end */ + { MIPI_CSIS_INTSRC_FRAME_START, "Frame Start" }, + { MIPI_CSIS_INTSRC_FRAME_END, "Frame End" }, +}; + +#define MIPI_CSIS_NUM_EVENTS ARRAY_SIZE(mipi_csis_events) + +static const char * const mipi_csis_clk_id[] = {"pclk", "wrap", "phy"}; + +struct csis_hw_reset { + struct regmap *src; + u8 req_src; + u8 rst_bit; +}; + +struct csi_state { + /* lock elements below */ + struct mutex lock; + /* lock for event handler */ + spinlock_t slock; + struct device *dev; + struct media_pad pads[CSIS_PADS_NUM]; + struct v4l2_subdev mipi_sd; + struct v4l2_subdev *src_sd; + + u8 index; + struct platform_device *pdev; + struct phy *phy; + void __iomem *regs; + struct clk *wrap_clk; + int irq; + u32 flags; + + struct dentry *debugfs_root; + bool debug; + + int num_clks; + struct clk_bulk_data *clks; + + u32 clk_frequency; + u32 hs_settle; + + struct reset_control *mrst; + + const struct csis_pix_format *csis_fmt; + struct v4l2_mbus_framefmt format_mbus; + + struct v4l2_fwnode_bus_mipi_csi2 bus; + + struct mipi_csis_event events[MIPI_CSIS_NUM_EVENTS]; + + struct v4l2_async_notifier subdev_notifier; + + struct csis_hw_reset hw_reset; + struct regulator *mipi_phy_regulator; + bool sink_linked; +}; + +struct csis_pix_format { + unsigned int pix_width_alignment; + u32 code; + u32 fmt_reg; + u8 data_alignment; +}; + +static const struct csis_pix_format mipi_csis_formats[] = { + { + .code = MEDIA_BUS_FMT_SBGGR10_1X10, + .fmt_reg = MIPI_CSIS_ISPCFG_FMT_RAW10, + .data_alignment = 16, + }, { + .code = MEDIA_BUS_FMT_VYUY8_2X8, + .fmt_reg = MIPI_CSIS_ISPCFG_FMT_YCBCR422_8BIT, + .data_alignment = 16, + }, { + .code = MEDIA_BUS_FMT_SBGGR8_1X8, + .fmt_reg = MIPI_CSIS_ISPCFG_FMT_RAW8, + .data_alignment = 8, + }, { + .code = MEDIA_BUS_FMT_YUYV8_2X8, + .fmt_reg = MIPI_CSIS_ISPCFG_FMT_YCBCR422_8BIT, + .data_alignment = 16, + } +}; + +#define mipi_csis_write(__csis, __r, __v) writel(__v, (__csis)->regs + (__r)) +#define mipi_csis_read(__csis, __r) readl((__csis)->regs + (__r)) + +static int mipi_csis_dump_regs(struct csi_state *state) +{ + struct device *dev = &state->pdev->dev; + unsigned int i; + u32 cfg; + struct { + u32 offset; + const char * const name; + } registers[] = { + { 0x04, "CTRL" }, + { 0x24, "DPHYCTRL" }, + { 0x08, "CLKCTRL" }, + { 0x20, "DPHYSTS" }, + { 0x10, "INTMSK" }, + { 0x40, "CONFIG_CH0" }, + { 0xC0, "DBG_CONFIG" }, + { 0x38, "DPHYSLAVE_L" }, + { 0x3C, "DPHYSLAVE_H" }, + }; + + dev_info(dev, "--- REGISTERS ---\n"); + + for (i = 0; i < ARRAY_SIZE(registers); i++) { + cfg = mipi_csis_read(state, registers[i].offset); + dev_info(dev, "%12s: 0x%08x\n", registers[i].name, cfg); + } + + return 0; +} + +static struct csi_state *mipi_sd_to_csis_state(struct v4l2_subdev *sdev) +{ + return container_of(sdev, struct csi_state, mipi_sd); +} + +static const struct csis_pix_format *find_csis_format(u32 code) +{ + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(mipi_csis_formats); i++) + if (code == mipi_csis_formats[i].code) + return &mipi_csis_formats[i]; + return NULL; +} + +static void mipi_csis_enable_interrupts(struct csi_state *state, bool on) +{ + mipi_csis_write(state, MIPI_CSIS_INTMSK, on ? 0xffffffff : 0); +} + +static void mipi_csis_sw_reset(struct csi_state *state) +{ + u32 val = mipi_csis_read(state, MIPI_CSIS_CMN_CTRL); + + mipi_csis_write(state, MIPI_CSIS_CMN_CTRL, + val | MIPI_CSIS_CMN_CTRL_RESET); + usleep_range(10, 20); +} + +static int mipi_csis_phy_init(struct csi_state *state) +{ + state->mipi_phy_regulator = devm_regulator_get(state->dev, "phy"); + + return regulator_set_voltage(state->mipi_phy_regulator, 1000000, + 1000000); +} + +static void mipi_csis_phy_reset(struct csi_state *state) +{ + reset_control_assert(state->mrst); + + msleep(20); + + reset_control_deassert(state->mrst); +} + +static void mipi_csis_system_enable(struct csi_state *state, int on) +{ + u32 val, mask; + + val = mipi_csis_read(state, MIPI_CSIS_CMN_CTRL); + if (on) + val |= MIPI_CSIS_CMN_CTRL_ENABLE; + else + val &= ~MIPI_CSIS_CMN_CTRL_ENABLE; + mipi_csis_write(state, MIPI_CSIS_CMN_CTRL, val); + + val = mipi_csis_read(state, MIPI_CSIS_DPHYCTRL); + val &= ~MIPI_CSIS_DPHYCTRL_ENABLE; + if (on) { + mask = (1 << (state->bus.num_data_lanes + 1)) - 1; + val |= (mask & MIPI_CSIS_DPHYCTRL_ENABLE); + } + mipi_csis_write(state, MIPI_CSIS_DPHYCTRL, val); +} + +/* Called with the state.lock mutex held */ +static void __mipi_csis_set_format(struct csi_state *state) +{ + struct v4l2_mbus_framefmt *mf = &state->format_mbus; + u32 val; + + /* Color format */ + val = mipi_csis_read(state, MIPI_CSIS_ISPCONFIG_CH0); + val = (val & ~MIPI_CSIS_ISPCFG_FMT_MASK) | state->csis_fmt->fmt_reg; + mipi_csis_write(state, MIPI_CSIS_ISPCONFIG_CH0, val); + + /* Pixel resolution */ + val = mf->width | (mf->height << 16); + mipi_csis_write(state, MIPI_CSIS_ISPRESOL_CH0, val); +} + +static void mipi_csis_set_hsync_settle(struct csi_state *state, int hs_settle) +{ + u32 val = mipi_csis_read(state, MIPI_CSIS_DPHYCTRL); + + val = ((val & ~MIPI_CSIS_DPHYCTRL_HSS_MASK) | (hs_settle << 24)); + + mipi_csis_write(state, MIPI_CSIS_DPHYCTRL, val); +} + +static void mipi_csis_set_params(struct csi_state *state) +{ + int lanes = state->bus.num_data_lanes; + u32 val; + + val = mipi_csis_read(state, MIPI_CSIS_CMN_CTRL); + val &= ~MIPI_CSIS_CMN_CTRL_LANE_NR_MASK; + val |= (lanes - 1) << MIPI_CSIS_CMN_CTRL_LANE_NR_OFFSET; + mipi_csis_write(state, MIPI_CSIS_CMN_CTRL, val); + + __mipi_csis_set_format(state); + + mipi_csis_set_hsync_settle(state, state->hs_settle); + + val = mipi_csis_read(state, MIPI_CSIS_ISPCONFIG_CH0); + if (state->csis_fmt->data_alignment == 32) + val |= MIPI_CSIS_ISPCFG_ALIGN_32BIT; + else + val &= ~MIPI_CSIS_ISPCFG_ALIGN_32BIT; + mipi_csis_write(state, MIPI_CSIS_ISPCONFIG_CH0, val); + + val = (0 << MIPI_CSIS_ISPSYNC_HSYNC_LINTV_OFFSET) | + (0 << MIPI_CSIS_ISPSYNC_VSYNC_SINTV_OFFSET) | + (0 << MIPI_CSIS_ISPSYNC_VSYNC_EINTV_OFFSET); + mipi_csis_write(state, MIPI_CSIS_ISPSYNC_CH0, val); + + val = mipi_csis_read(state, MIPI_CSIS_CLK_CTRL); + val &= ~MIPI_CSIS_CLK_CTRL_WCLK_SRC; + if (state->wrap_clk) + val |= MIPI_CSIS_CLK_CTRL_WCLK_SRC; + else + val &= ~MIPI_CSIS_CLK_CTRL_WCLK_SRC; + + val |= MIPI_CSIS_CLK_CTRL_CLKGATE_TRAIL_CH0(15); + val &= ~MIPI_CSIS_CLK_CTRL_CLKGATE_EN_MSK; + mipi_csis_write(state, MIPI_CSIS_CLK_CTRL, val); + + mipi_csis_write(state, MIPI_CSIS_DPHYBCTRL_L, 0x1f4); + mipi_csis_write(state, MIPI_CSIS_DPHYBCTRL_H, 0); + + /* Update the shadow register. */ + val = mipi_csis_read(state, MIPI_CSIS_CMN_CTRL); + mipi_csis_write(state, MIPI_CSIS_CMN_CTRL, + val | MIPI_CSIS_CMN_CTRL_UPDATE_SHADOW | + MIPI_CSIS_CMN_CTRL_UPDATE_SHADOW_CTRL); +} + +static void mipi_csis_clk_enable(struct csi_state *state) +{ + int ret; + + ret = clk_bulk_prepare_enable(state->num_clks, state->clks); + if (ret < 0) + dev_err(state->dev, "failed to enable clocks\n"); +} + +static void mipi_csis_clk_disable(struct csi_state *state) +{ + clk_bulk_disable_unprepare(state->num_clks, state->clks); +} + +static int mipi_csis_clk_get(struct csi_state *state) +{ + struct device *dev = &state->pdev->dev; + unsigned int i; + int ret; + + state->num_clks = ARRAY_SIZE(mipi_csis_clk_id); + state->clks = devm_kcalloc(dev, state->num_clks, sizeof(*state->clks), + GFP_KERNEL); + + if (!state->clks) + return -ENOMEM; + + for (i = 0; i < state->num_clks; i++) + state->clks[i].id = mipi_csis_clk_id[i]; + + ret = devm_clk_bulk_get(dev, state->num_clks, state->clks); + if (ret < 0) + return ret; + + state->wrap_clk = devm_clk_get(dev, "wrap"); + if (IS_ERR(state->wrap_clk)) + return IS_ERR(state->wrap_clk); + + /* Set clock rate */ + ret = clk_set_rate(state->wrap_clk, state->clk_frequency); + if (ret < 0) + dev_err(dev, "set rate=%d failed: %d\n", state->clk_frequency, + ret); + + return ret; +} + +static void mipi_csis_start_stream(struct csi_state *state) +{ + mipi_csis_sw_reset(state); + mipi_csis_set_params(state); + mipi_csis_system_enable(state, true); + mipi_csis_enable_interrupts(state, true); +} + +static void mipi_csis_stop_stream(struct csi_state *state) +{ + mipi_csis_enable_interrupts(state, false); + mipi_csis_system_enable(state, false); +} + +static void mipi_csis_clear_counters(struct csi_state *state) +{ + unsigned long flags; + unsigned int i; + + spin_lock_irqsave(&state->slock, flags); + for (i = 0; i < MIPI_CSIS_NUM_EVENTS; i++) + state->events[i].counter = 0; + spin_unlock_irqrestore(&state->slock, flags); +} + +static void mipi_csis_log_counters(struct csi_state *state, bool non_errors) +{ + int i = non_errors ? MIPI_CSIS_NUM_EVENTS : MIPI_CSIS_NUM_EVENTS - 4; + struct device *dev = &state->pdev->dev; + unsigned long flags; + + spin_lock_irqsave(&state->slock, flags); + + for (i--; i >= 0; i--) { + if (state->events[i].counter > 0 || state->debug) + dev_info(dev, "%s events: %d\n", state->events[i].name, + state->events[i].counter); + } + spin_unlock_irqrestore(&state->slock, flags); +} + +/* + * V4L2 subdev operations + */ +static int mipi_csis_s_stream(struct v4l2_subdev *mipi_sd, int enable) +{ + struct csi_state *state = mipi_sd_to_csis_state(mipi_sd); + int ret = 0; + + if (enable) { + mipi_csis_clear_counters(state); + ret = pm_runtime_get_sync(&state->pdev->dev); + if (ret < 0) { + pm_runtime_put_noidle(&state->pdev->dev); + return ret; + } + ret = v4l2_subdev_call(state->src_sd, core, s_power, 1); + if (ret < 0) + return ret; + } + + mutex_lock(&state->lock); + if (enable) { + if (state->flags & ST_SUSPENDED) { + ret = -EBUSY; + goto unlock; + } + + mipi_csis_start_stream(state); + ret = v4l2_subdev_call(state->src_sd, video, s_stream, 1); + if (ret < 0) + goto unlock; + + mipi_csis_log_counters(state, true); + + state->flags |= ST_STREAMING; + } else { + v4l2_subdev_call(state->src_sd, video, s_stream, 0); + ret = v4l2_subdev_call(state->src_sd, core, s_power, 1); + mipi_csis_stop_stream(state); + state->flags &= ~ST_STREAMING; + if (state->debug) + mipi_csis_log_counters(state, true); + } + +unlock: + mutex_unlock(&state->lock); + if (!enable) + pm_runtime_put(&state->pdev->dev); + + return ret; +} + +static int mipi_csis_link_setup(struct media_entity *entity, + const struct media_pad *local_pad, + const struct media_pad *remote_pad, u32 flags) +{ + struct v4l2_subdev *mipi_sd = media_entity_to_v4l2_subdev(entity); + struct csi_state *state = mipi_sd_to_csis_state(mipi_sd); + struct v4l2_subdev *remote_sd; + int ret = 0; + + dev_dbg(state->dev, "link setup %s -> %s", remote_pad->entity->name, + local_pad->entity->name); + + remote_sd = media_entity_to_v4l2_subdev(remote_pad->entity); + + mutex_lock(&state->lock); + + if (local_pad->flags & MEDIA_PAD_FL_SOURCE) { + if (flags & MEDIA_LNK_FL_ENABLED) { + if (state->sink_linked) { + ret = -EBUSY; + goto out; + } + state->sink_linked = true; + } else { + state->sink_linked = false; + } + } else { + if (flags & MEDIA_LNK_FL_ENABLED) { + if (state->src_sd) { + ret = -EBUSY; + goto out; + } + state->src_sd = remote_sd; + } else { + state->src_sd = NULL; + } + } + +out: + mutex_unlock(&state->lock); + return ret; +} + +static int mipi_csis_init_cfg(struct v4l2_subdev *mipi_sd, + struct v4l2_subdev_pad_config *cfg) +{ + struct v4l2_mbus_framefmt *mf; + unsigned int i; + int ret; + + for (i = 0; i < CSIS_PADS_NUM; i++) { + mf = v4l2_subdev_get_try_format(mipi_sd, cfg, i); + + ret = imx_media_init_mbus_fmt(mf, MIPI_CSIS_DEF_PIX_HEIGHT, + MIPI_CSIS_DEF_PIX_WIDTH, 0, + V4L2_FIELD_NONE, NULL); + if (ret < 0) + return ret; + } + + return 0; +} + +static struct csis_pix_format const * +mipi_csis_try_format(struct v4l2_subdev *mipi_sd, struct v4l2_mbus_framefmt *mf) +{ + struct csi_state *state = mipi_sd_to_csis_state(mipi_sd); + struct csis_pix_format const *csis_fmt; + + csis_fmt = find_csis_format(mf->code); + if (!csis_fmt) + csis_fmt = &mipi_csis_formats[0]; + + v4l_bound_align_image(&mf->width, 1, CSIS_MAX_PIX_WIDTH, + csis_fmt->pix_width_alignment, + &mf->height, 1, CSIS_MAX_PIX_HEIGHT, 1, + 0); + + state->format_mbus.code = csis_fmt->code; + state->format_mbus.width = mf->width; + state->format_mbus.height = mf->height; + + return csis_fmt; +} + +static struct v4l2_mbus_framefmt * +mipi_csis_get_format(struct csi_state *state, + struct v4l2_subdev_pad_config *cfg, + enum v4l2_subdev_format_whence which, + unsigned int pad) +{ + if (which == V4L2_SUBDEV_FORMAT_TRY) + return v4l2_subdev_get_try_format(&state->mipi_sd, cfg, pad); + + return &state->format_mbus; +} + +static int mipi_csis_set_fmt(struct v4l2_subdev *mipi_sd, + struct v4l2_subdev_pad_config *cfg, + struct v4l2_subdev_format *sdformat) +{ + struct csi_state *state = mipi_sd_to_csis_state(mipi_sd); + struct csis_pix_format const *csis_fmt; + struct v4l2_mbus_framefmt *fmt; + + if (sdformat->pad >= CSIS_PADS_NUM) + return -EINVAL; + + fmt = mipi_csis_get_format(state, cfg, sdformat->which, sdformat->pad); + + mutex_lock(&state->lock); + if (fmt && sdformat->pad == CSIS_PAD_SOURCE) { + sdformat->format = *fmt; + goto unlock; + } + + csis_fmt = mipi_csis_try_format(mipi_sd, &sdformat->format); + + sdformat->format = *fmt; + + if (csis_fmt && sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE) + state->csis_fmt = csis_fmt; + else + cfg->try_fmt = sdformat->format; + +unlock: + mutex_unlock(&state->lock); + + return 0; +} + +static int mipi_csis_get_fmt(struct v4l2_subdev *mipi_sd, + struct v4l2_subdev_pad_config *cfg, + struct v4l2_subdev_format *sdformat) +{ + struct csi_state *state = mipi_sd_to_csis_state(mipi_sd); + struct v4l2_mbus_framefmt *fmt; + + mutex_lock(&state->lock); + + fmt = mipi_csis_get_format(state, cfg, sdformat->which, sdformat->pad); + + sdformat->format = *fmt; + + mutex_unlock(&state->lock); + + return 0; +} + +static int mipi_csis_log_status(struct v4l2_subdev *mipi_sd) +{ + struct csi_state *state = mipi_sd_to_csis_state(mipi_sd); + + mutex_lock(&state->lock); + mipi_csis_log_counters(state, true); + if (state->debug && (state->flags & ST_POWERED)) + mipi_csis_dump_regs(state); + mutex_unlock(&state->lock); + + return 0; +} + +static irqreturn_t mipi_csis_irq_handler(int irq, void *dev_id) +{ + struct csi_state *state = dev_id; + unsigned long flags; + unsigned int i; + u32 status; + + status = mipi_csis_read(state, MIPI_CSIS_INTSRC); + + spin_lock_irqsave(&state->slock, flags); + + /* Update the event/error counters */ + if ((status & MIPI_CSIS_INTSRC_ERRORS) || state->debug) { + for (i = 0; i < MIPI_CSIS_NUM_EVENTS; i++) { + if (!(status & state->events[i].mask)) + continue; + state->events[i].counter++; + } + } + spin_unlock_irqrestore(&state->slock, flags); + + mipi_csis_write(state, MIPI_CSIS_INTSRC, status); + + return IRQ_HANDLED; +} + +static const struct v4l2_subdev_core_ops mipi_csis_core_ops = { + .log_status = mipi_csis_log_status, +}; + +static const struct media_entity_operations mipi_csis_entity_ops = { + .link_setup = mipi_csis_link_setup, + .link_validate = v4l2_subdev_link_validate, +}; + +static const struct v4l2_subdev_video_ops mipi_csis_video_ops = { + .s_stream = mipi_csis_s_stream, +}; + +static const struct v4l2_subdev_pad_ops mipi_csis_pad_ops = { + .init_cfg = mipi_csis_init_cfg, + .get_fmt = mipi_csis_get_fmt, + .set_fmt = mipi_csis_set_fmt, +}; + +static const struct v4l2_subdev_ops mipi_csis_subdev_ops = { + .core = &mipi_csis_core_ops, + .video = &mipi_csis_video_ops, + .pad = &mipi_csis_pad_ops, +}; + +static int mipi_csis_parse_dt(struct platform_device *pdev, + struct csi_state *state) +{ + struct device_node *node = pdev->dev.of_node; + + if (of_property_read_u32(node, "clock-frequency", + &state->clk_frequency)) + state->clk_frequency = DEFAULT_SCLK_CSIS_FREQ; + + /* Get MIPI PHY resets */ + state->mrst = devm_reset_control_get_exclusive(&pdev->dev, "mrst"); + if (IS_ERR(state->mrst)) + return PTR_ERR(state->mrst); + + /* Get MIPI CSI-2 bus configuration from the endpoint node. */ + of_property_read_u32(node, "fsl,csis-hs-settle", &state->hs_settle); + + return 0; +} + +static int mipi_csis_pm_resume(struct device *dev, bool runtime); + +static int mipi_csis_parse_endpoint(struct device *dev, + struct v4l2_fwnode_endpoint *ep, + struct v4l2_async_subdev *asd) +{ + struct v4l2_subdev *mipi_sd = dev_get_drvdata(dev); + struct csi_state *state = mipi_sd_to_csis_state(mipi_sd); + + if (ep->bus_type != V4L2_MBUS_CSI2_DPHY) { + dev_err(dev, "invalid bus type, must be MIPI CSI2\n"); + return -EINVAL; + } + + state->bus = ep->bus.mipi_csi2; + + dev_dbg(state->dev, "data lanes: %d\n", state->bus.num_data_lanes); + dev_dbg(state->dev, "flags: 0x%08x\n", state->bus.flags); + + return 0; +} + +static int mipi_csis_subdev_init(struct v4l2_subdev *mipi_sd, + struct platform_device *pdev, + const struct v4l2_subdev_ops *ops) +{ + struct csi_state *state = mipi_sd_to_csis_state(mipi_sd); + unsigned int sink_port = 0; + int ret; + + v4l2_subdev_init(mipi_sd, ops); + mipi_sd->owner = THIS_MODULE; + snprintf(mipi_sd->name, sizeof(mipi_sd->name), "%s.%d", + CSIS_SUBDEV_NAME, state->index); + + mipi_sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; + mipi_sd->ctrl_handler = NULL; + + mipi_sd->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE; + mipi_sd->entity.ops = &mipi_csis_entity_ops; + + mipi_sd->dev = &pdev->dev; + + state->csis_fmt = &mipi_csis_formats[0]; + state->format_mbus.code = mipi_csis_formats[0].code; + state->format_mbus.width = MIPI_CSIS_DEF_PIX_WIDTH; + state->format_mbus.height = MIPI_CSIS_DEF_PIX_HEIGHT; + state->format_mbus.field = V4L2_FIELD_NONE; + + v4l2_set_subdevdata(mipi_sd, &pdev->dev); + + ret = v4l2_async_register_fwnode_subdev(mipi_sd, + sizeof(struct v4l2_async_subdev), + &sink_port, 1, + mipi_csis_parse_endpoint); + if (ret < 0) + dev_err(&pdev->dev, "async fwnode register failed: %d\n", ret); + + return ret; +} + +#ifdef CONFIG_DEBUG_FS +#include <linux/debugfs.h> + +static int mipi_csis_dump_regs_show(struct seq_file *m, void *private) +{ + struct csi_state *state = m->private; + + return mipi_csis_dump_regs(state); +} +DEFINE_SHOW_ATTRIBUTE(mipi_csis_dump_regs); + +static int __init_or_module mipi_csis_debugfs_init(struct csi_state *state) +{ + struct dentry *d; + + if (!debugfs_initialized()) + return -ENODEV; + + state->debugfs_root = debugfs_create_dir(dev_name(state->dev), NULL); + if (!state->debugfs_root) + return -ENOMEM; + + d = debugfs_create_bool("debug_enable", 0600, state->debugfs_root, + &state->debug); + if (!d) + goto remove_debugfs; + + d = debugfs_create_file("dump_regs", 0600, state->debugfs_root, + state, &mipi_csis_dump_regs_fops); + if (!d) + goto remove_debugfs; + + return 0; + +remove_debugfs: + debugfs_remove_recursive(state->debugfs_root); + + return -ENOMEM; +} + +static void mipi_csis_debugfs_exit(struct csi_state *state) +{ + debugfs_remove_recursive(state->debugfs_root); +} + +#else +static int mipi_csis_debugfs_init(struct csi_state *state __maybe_unused) +{ + return 0; +} + +static void mipi_csis_debugfs_exit(struct csi_state *state __maybe_unused) +{ +} +#endif + +static int mipi_csis_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct resource *mem_res; + struct csi_state *state; + int ret = -ENOMEM; + + state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL); + if (!state) + return -ENOMEM; + + spin_lock_init(&state->slock); + + state->pdev = pdev; + state->dev = dev; + + ret = mipi_csis_parse_dt(pdev, state); + if (ret < 0) { + dev_err(dev, "Failed to parse device tree: %d\n", ret); + return ret; + } + + mipi_csis_phy_init(state); + mipi_csis_phy_reset(state); + + mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + state->regs = devm_ioremap_resource(dev, mem_res); + if (IS_ERR(state->regs)) + return PTR_ERR(state->regs); + + state->irq = platform_get_irq(pdev, 0); + if (state->irq < 0) { + dev_err(dev, "Failed to get irq\n"); + return state->irq; + } + + ret = mipi_csis_clk_get(state); + if (ret < 0) + return ret; + + mipi_csis_clk_enable(state); + + ret = devm_request_irq(dev, state->irq, mipi_csis_irq_handler, + 0, dev_name(dev), state); + if (ret) { + dev_err(dev, "Interrupt request failed\n"); + goto disable_clock; + } + + platform_set_drvdata(pdev, &state->mipi_sd); + + mutex_init(&state->lock); + ret = mipi_csis_subdev_init(&state->mipi_sd, pdev, + &mipi_csis_subdev_ops); + if (ret < 0) + goto disable_clock; + + state->pads[CSIS_PAD_SINK].flags = MEDIA_PAD_FL_SINK; + state->pads[CSIS_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE; + ret = media_entity_pads_init(&state->mipi_sd.entity, CSIS_PADS_NUM, + state->pads); + if (ret < 0) + goto unregister_subdev; + + memcpy(state->events, mipi_csis_events, sizeof(state->events)); + + mipi_csis_debugfs_init(state); + pm_runtime_enable(dev); + if (!pm_runtime_enabled(dev)) { + ret = mipi_csis_pm_resume(dev, true); + if (ret < 0) + goto unregister_all; + } + + dev_info(&pdev->dev, "lanes: %d, hs_settle: %d, wclk: %d, freq: %u\n", + state->bus.num_data_lanes, state->hs_settle, + state->wrap_clk ? 1 : 0, state->clk_frequency); + + return 0; + +unregister_all: + mipi_csis_debugfs_exit(state); + media_entity_cleanup(&state->mipi_sd.entity); +unregister_subdev: + v4l2_async_unregister_subdev(&state->mipi_sd); +disable_clock: + mipi_csis_clk_disable(state); + mutex_destroy(&state->lock); + + return ret; +} + +static int mipi_csis_pm_suspend(struct device *dev, bool runtime) +{ + struct platform_device *pdev = to_platform_device(dev); + struct v4l2_subdev *mipi_sd = platform_get_drvdata(pdev); + struct csi_state *state = mipi_sd_to_csis_state(mipi_sd); + int ret = 0; + + mutex_lock(&state->lock); + if (state->flags & ST_POWERED) { + mipi_csis_stop_stream(state); + ret = regulator_disable(state->mipi_phy_regulator); + if (ret) + goto unlock; + mipi_csis_clk_disable(state); + state->flags &= ~ST_POWERED; + if (!runtime) + state->flags |= ST_SUSPENDED; + } + +unlock: + mutex_unlock(&state->lock); + + return ret ? -EAGAIN : 0; +} + +static int mipi_csis_pm_resume(struct device *dev, bool runtime) +{ + struct platform_device *pdev = to_platform_device(dev); + struct v4l2_subdev *mipi_sd = platform_get_drvdata(pdev); + struct csi_state *state = mipi_sd_to_csis_state(mipi_sd); + int ret = 0; + + mutex_lock(&state->lock); + if (!runtime && !(state->flags & ST_SUSPENDED)) + goto unlock; + + if (!(state->flags & ST_POWERED)) { + ret = regulator_enable(state->mipi_phy_regulator); + if (ret) + goto unlock; + + state->flags |= ST_POWERED; + mipi_csis_clk_enable(state); + } + if (state->flags & ST_STREAMING) + mipi_csis_start_stream(state); + + state->flags &= ~ST_SUSPENDED; + +unlock: + mutex_unlock(&state->lock); + + return ret ? -EAGAIN : 0; +} + +static int __maybe_unused mipi_csis_suspend(struct device *dev) +{ + return mipi_csis_pm_suspend(dev, false); +} + +static int __maybe_unused mipi_csis_resume(struct device *dev) +{ + return mipi_csis_pm_resume(dev, false); +} + +static int __maybe_unused mipi_csis_runtime_suspend(struct device *dev) +{ + return mipi_csis_pm_suspend(dev, true); +} + +static int __maybe_unused mipi_csis_runtime_resume(struct device *dev) +{ + return mipi_csis_pm_resume(dev, true); +} + +static int mipi_csis_remove(struct platform_device *pdev) +{ + struct v4l2_subdev *mipi_sd = platform_get_drvdata(pdev); + struct csi_state *state = mipi_sd_to_csis_state(mipi_sd); + + mipi_csis_debugfs_exit(state); + v4l2_async_unregister_subdev(&state->mipi_sd); + v4l2_async_notifier_unregister(&state->subdev_notifier); + + pm_runtime_disable(&pdev->dev); + mipi_csis_pm_suspend(&pdev->dev, true); + mipi_csis_clk_disable(state); + media_entity_cleanup(&state->mipi_sd.entity); + mutex_destroy(&state->lock); + pm_runtime_set_suspended(&pdev->dev); + + return 0; +} + +static const struct dev_pm_ops mipi_csis_pm_ops = { + SET_RUNTIME_PM_OPS(mipi_csis_runtime_suspend, mipi_csis_runtime_resume, + NULL) + SET_SYSTEM_SLEEP_PM_OPS(mipi_csis_suspend, mipi_csis_resume) +}; + +static const struct of_device_id mipi_csis_of_match[] = { + { .compatible = "fsl,imx7-mipi-csi2", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, mipi_csis_of_match); + +static struct platform_driver mipi_csis_driver = { + .probe = mipi_csis_probe, + .remove = mipi_csis_remove, + .driver = { + .of_match_table = mipi_csis_of_match, + .name = CSIS_DRIVER_NAME, + .pm = &mipi_csis_pm_ops, + }, +}; + +module_platform_driver(mipi_csis_driver); + +MODULE_DESCRIPTION("i.MX7 MIPI CSI-2 Receiver driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:imx7-mipi-csi2"); |