From patchwork Mon Aug 1 21:47:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lad Prabhakar X-Patchwork-Id: 12934141 X-Patchwork-Delegate: kieran@bingham.xyz Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C3D66C19F29 for ; Mon, 1 Aug 2022 21:47:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235236AbiHAVrz (ORCPT ); Mon, 1 Aug 2022 17:47:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42712 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235241AbiHAVrt (ORCPT ); Mon, 1 Aug 2022 17:47:49 -0400 Received: from relmlie5.idc.renesas.com (relmlor1.renesas.com [210.160.252.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 28D0F40BE1; Mon, 1 Aug 2022 14:47:45 -0700 (PDT) X-IronPort-AV: E=Sophos;i="5.93,209,1654527600"; d="scan'208";a="128135701" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie5.idc.renesas.com with ESMTP; 02 Aug 2022 06:47:44 +0900 Received: from localhost.localdomain (unknown [10.226.36.204]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id A7EFB4108E35; Tue, 2 Aug 2022 06:47:39 +0900 (JST) From: Lad Prabhakar To: Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Philipp Zabel , Laurent Pinchart , Jacopo Mondi , =?utf-8?q?Niklas_S=C3=B6derlund?= , Sakari Ailus , Hans Verkuil Cc: Geert Uytterhoeven , linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Prabhakar , Biju Das , Lad Prabhakar Subject: [PATCH 3/4] media: platform: Add Renesas RZ/G2L MIPI CSI-2 receiver driver Date: Mon, 1 Aug 2022 22:47:17 +0100 Message-Id: <20220801214718.16943-4-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220801214718.16943-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20220801214718.16943-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org Add MIPI CSI-2 receiver driver for Renesas RZ/G2L. The MIPI CSI-2 is part of the CRU module found on RZ/G2L family. Based on a patch in the BSP by Hien Huynh Signed-off-by: Lad Prabhakar --- RFC v2 -> v1 * Fixed initialization sequence of DPHY and link * Exported DPHY and link initialization functions so that the CRU core driver can initialize the CRU and CSI2 as per the HW manual. RFC v1 -> RFC v2 * new patch (split up as new driver compared to v1) --- drivers/media/platform/renesas/Kconfig | 1 + drivers/media/platform/renesas/Makefile | 1 + .../media/platform/renesas/rzg2l-cru/Kconfig | 17 + .../media/platform/renesas/rzg2l-cru/Makefile | 3 + .../platform/renesas/rzg2l-cru/rzg2l-csi2.c | 702 ++++++++++++++++++ .../platform/renesas/rzg2l-cru/rzg2l-csi2.h | 49 ++ 6 files changed, 773 insertions(+) create mode 100644 drivers/media/platform/renesas/rzg2l-cru/Kconfig create mode 100644 drivers/media/platform/renesas/rzg2l-cru/Makefile create mode 100644 drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c create mode 100644 drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.h diff --git a/drivers/media/platform/renesas/Kconfig b/drivers/media/platform/renesas/Kconfig index 9fd90672ea2d..ed788e991f74 100644 --- a/drivers/media/platform/renesas/Kconfig +++ b/drivers/media/platform/renesas/Kconfig @@ -41,6 +41,7 @@ config VIDEO_SH_VOU Support for the Video Output Unit (VOU) on SuperH SoCs. source "drivers/media/platform/renesas/rcar-vin/Kconfig" +source "drivers/media/platform/renesas/rzg2l-cru/Kconfig" # Mem2mem drivers diff --git a/drivers/media/platform/renesas/Makefile b/drivers/media/platform/renesas/Makefile index 3ec226ef5fd2..55854e868887 100644 --- a/drivers/media/platform/renesas/Makefile +++ b/drivers/media/platform/renesas/Makefile @@ -4,6 +4,7 @@ # obj-y += rcar-vin/ +obj-y += rzg2l-cru/ obj-y += vsp1/ obj-$(CONFIG_VIDEO_RCAR_DRIF) += rcar_drif.o diff --git a/drivers/media/platform/renesas/rzg2l-cru/Kconfig b/drivers/media/platform/renesas/rzg2l-cru/Kconfig new file mode 100644 index 000000000000..150bf16f167c --- /dev/null +++ b/drivers/media/platform/renesas/rzg2l-cru/Kconfig @@ -0,0 +1,17 @@ +# SPDX-License-Identifier: GPL-2.0 + +config VIDEO_RZG2L_CSI2 + tristate "RZ/G2L MIPI CSI-2 Receiver" + depends on V4L_PLATFORM_DRIVERS + depends on VIDEO_DEV && OF + depends on ARCH_RENESAS || COMPILE_TEST + select MEDIA_CONTROLLER + select VIDEO_V4L2_SUBDEV_API + select RESET_CONTROLLER + select V4L2_FWNODE + help + Support for Renesas RZ/G2L (and alike SoC's) MIPI CSI-2 + Receiver driver. + + To compile this driver as a module, choose M here: the + module will be called rzg2l-csi2. diff --git a/drivers/media/platform/renesas/rzg2l-cru/Makefile b/drivers/media/platform/renesas/rzg2l-cru/Makefile new file mode 100644 index 000000000000..91ea97a944e6 --- /dev/null +++ b/drivers/media/platform/renesas/rzg2l-cru/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_VIDEO_RZG2L_CSI2) += rzg2l-csi2.o diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c new file mode 100644 index 000000000000..252e33ddb6e8 --- /dev/null +++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c @@ -0,0 +1,702 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for Renesas RZ/G2L MIPI CSI-2 Receiver + * + * Copyright (C) 2022 Renesas Electronics Corp. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#include "rzg2l-csi2.h" + +/* LINK registers */ +/* Module Configuration Register */ +#define CSI2nMCG 0x0 +#define CSI2nMCG_SDLN GENMASK(11, 8) + +/* Module Control Register 0 */ +#define CSI2nMCT0 0x10 +#define CSI2nMCT0_VDLN(x) ((x) << 0) + +/* Module Control Register 2 */ +#define CSI2nMCT2 0x18 +#define CSI2nMCT2_FRRSKW(x) ((x) << 16) +#define CSI2nMCT2_FRRCLK(x) ((x) << 0) + +/* Module Control Register 3 */ +#define CSI2nMCT3 0x1c +#define CSI2nMCT3_RXEN BIT(0) + +/* Reset Control Register */ +#define CSI2nRTCT 0x28 +#define CSI2nRTCT_VSRST BIT(0) + +/* Reset Status Register */ +#define CSI2nRTST 0x2c +#define CSI2nRTST_VSRSTS BIT(0) + +/* Receive Data Type Enable Low Register */ +#define CSI2nDTEL 0x60 + +/* Receive Data Type Enable High Register */ +#define CSI2nDTEH 0x64 + +/* Power Management Status Register */ +#define CSI2nPMST 0x200 + +/* Power Management Status Clear Register */ +#define CSI2nPMSC 0x204 + +/* DPHY registers */ +/* D-PHY Control Register 0 */ +#define CSIDPHYCTRL0 0x400 +#define CSIDPHYCTRL0_EN_LDO1200 BIT(1) +#define CSIDPHYCTRL0_EN_BGR BIT(0) + +/* D-PHY Timing Register 0 */ +#define CSIDPHYTIM0 0x404 +#define CSIDPHYTIM0_TCLK_MISS(x) ((x) << 24) +#define CSIDPHYTIM0_T_INIT(x) ((x) << 0) + +/* D-PHY Timing Register 1 */ +#define CSIDPHYTIM1 0x408 +#define CSIDPHYTIM1_THS_PREPARE(x) ((x) << 24) +#define CSIDPHYTIM1_TCLK_PREPARE(x) ((x) << 16) +#define CSIDPHYTIM1_THS_SETTLE(x) ((x) << 8) +#define CSIDPHYTIM1_TCLK_SETTLE(x) ((x) << 0) + +/* D-PHY Skew Adjustment Function */ +#define CSIDPHYSKW0 0x460 +#define CSIDPHYSKW0_UTIL_DL0_SKW_ADJ(x) ((x) & 0x3) +#define CSIDPHYSKW0_UTIL_DL1_SKW_ADJ(x) (((x) & 0x3) << 4) +#define CSIDPHYSKW0_UTIL_DL2_SKW_ADJ(x) (((x) & 0x3) << 8) +#define CSIDPHYSKW0_UTIL_DL3_SKW_ADJ(x) (((x) & 0x3) << 12) +#define CSIDPHYSKW0_DEFAULT_SKW CSIDPHYSKW0_UTIL_DL0_SKW_ADJ(1) | \ + CSIDPHYSKW0_UTIL_DL1_SKW_ADJ(1) | \ + CSIDPHYSKW0_UTIL_DL2_SKW_ADJ(1) | \ + CSIDPHYSKW0_UTIL_DL3_SKW_ADJ(1) + +#define VSRSTS_RETRIES 20 + +struct timings { + u32 t_init; + u32 tclk_miss; + u32 tclk_settle; + u32 ths_settle; + u32 tclk_prepare; + u32 ths_prepare; +}; + +enum dphy_timings { + TRANSMISSION_RATE_80_MBPS = 0, + TRANSMISSION_RATE_125_MBPS, + TRANSMISSION_RATE_250_MBPS, + TRANSMISSION_RATE_360_MBPS, + TRANSMISSION_RATE_360_PLUS_MBPS, +}; + +static const struct timings global_timings[] = { + [TRANSMISSION_RATE_80_MBPS] = { + .t_init = 79801, + .tclk_miss = 4, + .tclk_settle = 23, + .ths_settle = 31, + .tclk_prepare = 10, + .ths_prepare = 19, + }, + [TRANSMISSION_RATE_125_MBPS] = { + .t_init = 79801, + .tclk_miss = 4, + .tclk_settle = 23, + .ths_settle = 28, + .tclk_prepare = 10, + .ths_prepare = 19, + }, + [TRANSMISSION_RATE_250_MBPS] = { + .t_init = 79801, + .tclk_miss = 4, + .tclk_settle = 23, + .ths_settle = 22, + .tclk_prepare = 10, + .ths_prepare = 16, + }, + [TRANSMISSION_RATE_360_MBPS] = { + .t_init = 79801, + .tclk_miss = 4, + .tclk_settle = 18, + .ths_settle = 19, + .tclk_prepare = 10, + .ths_prepare = 10, + }, + [TRANSMISSION_RATE_360_PLUS_MBPS] = { + .t_init = 79801, + .tclk_miss = 4, + .tclk_settle = 18, + .ths_settle = 18, + .tclk_prepare = 10, + .ths_prepare = 10, + }, +}; + +struct rzg2l_csi2_format { + u32 code; + unsigned int datatype; + unsigned int bpp; +}; + +static const struct rzg2l_csi2_format rzg2l_csi2_formats[] = { + { .code = MEDIA_BUS_FMT_UYVY8_1X16, .datatype = 0x1e, .bpp = 16 }, +}; + +static const struct rzg2l_csi2_format *rzg2l_csi2_code_to_fmt(unsigned int code) +{ + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(rzg2l_csi2_formats); i++) + if (rzg2l_csi2_formats[i].code == code) + return &rzg2l_csi2_formats[i]; + + return NULL; +} + +static inline struct rzg2l_csi2 *notifier_to_csi2(struct v4l2_async_notifier *n) +{ + return container_of(n, struct rzg2l_csi2, notifier); +} + +static u32 rzg2l_csi2_read(struct rzg2l_csi2 *csi2, unsigned int reg) +{ + return ioread32(csi2->base + reg); +} + +static void rzg2l_csi2_write(struct rzg2l_csi2 *csi2, unsigned int reg, + u32 data) +{ + iowrite32(data, csi2->base + reg); +} + +static void rzg2l_csi2_set(struct rzg2l_csi2 *csi2, unsigned int reg, u32 set) +{ + rzg2l_csi2_write(csi2, reg, rzg2l_csi2_read(csi2, reg) | set); +} + +static void rzg2l_csi2_clr(struct rzg2l_csi2 *csi2, unsigned int reg, u32 clr) +{ + rzg2l_csi2_write(csi2, reg, rzg2l_csi2_read(csi2, reg) & ~clr); +} + +static int rzg2l_csi2_calc_mbps(struct rzg2l_csi2 *csi2) +{ + const struct rzg2l_csi2_format *format; + struct v4l2_subdev *source; + struct v4l2_ctrl *ctrl; + u64 mbps; + + if (!csi2->remote) + return -ENODEV; + + source = csi2->remote; + + /* Read the pixel rate control from remote. */ + ctrl = v4l2_ctrl_find(source->ctrl_handler, V4L2_CID_PIXEL_RATE); + if (!ctrl) { + dev_err(csi2->dev, "no pixel rate control in subdev %s\n", + source->name); + return -EINVAL; + } + + format = rzg2l_csi2_code_to_fmt(csi2->mf.code); + + /* + * Calculate hsfreq in Mbps + * hsfreq = (pixel_rate * bits_per_sample) / number_of_lanes + */ + mbps = v4l2_ctrl_g_ctrl_int64(ctrl) * format->bpp; + do_div(mbps, csi2->lanes * 1000000); + + return mbps; +} + +int rzg2l_csi2_cmn_rstb_deassert(struct rzg2l_csi2 *csi2) +{ + return reset_control_deassert(csi2->rstc); +} +EXPORT_SYMBOL_GPL(rzg2l_csi2_cmn_rstb_deassert); + +/* ----------------------------------------------------------------------------- + * DPHY setting + */ + +int rzg2l_csi2_dphy_setting(struct rzg2l_csi2 *csi2, bool on) +{ + int lanes, mbps; + + dev_dbg(csi2->dev, "Input size (%ux%u%c)\n", + csi2->mf.width, csi2->mf.height, + csi2->mf.field == V4L2_FIELD_NONE ? 'p' : 'i'); + + /* Checking the maximum lanes support for CSI-2 module */ + lanes = (rzg2l_csi2_read(csi2, CSI2nMCG) & CSI2nMCG_SDLN) >> 8; + if (lanes < csi2->lanes) { + dev_err(csi2->dev, + "Failed to support %d data lanes\n", csi2->lanes); + return -EINVAL; + } + + mbps = rzg2l_csi2_calc_mbps(csi2); + if (mbps < 0) + return mbps; + + csi2->hsfreq = mbps; + + if (on) { + struct timings dphy_timing; + u32 dphytim0, dphytim1; + + /* Set DPHY timing parameters */ + if (csi2->hsfreq <= 80) + dphy_timing = global_timings[TRANSMISSION_RATE_80_MBPS]; + else if (csi2->hsfreq <= 125) + dphy_timing = global_timings[TRANSMISSION_RATE_125_MBPS]; + else if (csi2->hsfreq <= 250) + dphy_timing = global_timings[TRANSMISSION_RATE_250_MBPS]; + else if (csi2->hsfreq <= 360) + dphy_timing = global_timings[TRANSMISSION_RATE_360_MBPS]; + else if (csi2->hsfreq <= 1500) + dphy_timing = global_timings[TRANSMISSION_RATE_360_PLUS_MBPS]; + else + return -EINVAL; + + /* Set D-PHY timing parameters */ + dphytim0 = CSIDPHYTIM0_TCLK_MISS(dphy_timing.tclk_miss) | + CSIDPHYTIM0_T_INIT(dphy_timing.t_init); + dphytim1 = CSIDPHYTIM1_THS_PREPARE(dphy_timing.ths_prepare) | + CSIDPHYTIM1_TCLK_PREPARE(dphy_timing.tclk_prepare) | + CSIDPHYTIM1_THS_SETTLE(dphy_timing.ths_settle) | + CSIDPHYTIM1_TCLK_SETTLE(dphy_timing.tclk_settle); + rzg2l_csi2_write(csi2, CSIDPHYTIM0, dphytim0); + rzg2l_csi2_write(csi2, CSIDPHYTIM1, dphytim1); + + /* Enable D-PHY power control 0 */ + rzg2l_csi2_write(csi2, CSIDPHYSKW0, CSIDPHYSKW0_DEFAULT_SKW); + + /* Set the EN_BGR bit */ + rzg2l_csi2_set(csi2, CSIDPHYCTRL0, CSIDPHYCTRL0_EN_BGR); + + /* Delay 20us to be stable */ + usleep_range(20, 40); + + /* Enable D-PHY power control 1 */ + rzg2l_csi2_set(csi2, CSIDPHYCTRL0, CSIDPHYCTRL0_EN_LDO1200); + + /* Delay 10us to be stable */ + usleep_range(10, 20); + + /* Start supplying the internal clock for the D-PHY block */ + pm_runtime_get_sync(csi2->dev); + } else { + /* Reset the CRU (D-PHY) */ + reset_control_assert(csi2->rstc); + + /* Stop the D-PHY clock */ + pm_runtime_put(csi2->dev); + + /* Cancel the EN_LDO1200 register setting */ + rzg2l_csi2_clr(csi2, CSIDPHYCTRL0, CSIDPHYCTRL0_EN_LDO1200); + + /* Cancel the EN_BGR register setting */ + rzg2l_csi2_clr(csi2, CSIDPHYCTRL0, CSIDPHYCTRL0_EN_BGR); + } + + return 0; +} +EXPORT_SYMBOL_GPL(rzg2l_csi2_dphy_setting); + +void rzg2l_csi2_mipi_link_setting(struct rzg2l_csi2 *csi2, bool on) +{ + if (on) { + unsigned long vclk_rate = csi2->vclk_rate / HZ_PER_MHZ; + u32 frrskw, frrclk, frrskw_coeff, frrclk_coeff; + + /* Select data lanes */ + rzg2l_csi2_write(csi2, CSI2nMCT0, CSI2nMCT0_VDLN(csi2->lanes)); + + frrskw_coeff = 3 * vclk_rate * 8; + frrclk_coeff = frrskw_coeff / 2; + frrskw = DIV_ROUND_UP(frrskw_coeff, csi2->hsfreq); + frrclk = DIV_ROUND_UP(frrclk_coeff, csi2->hsfreq); + rzg2l_csi2_write(csi2, CSI2nMCT2, + CSI2nMCT2_FRRSKW(frrskw) | CSI2nMCT2_FRRCLK(frrclk)); + + /* + * Select data type. + * FS, FE, LS, LE, Generic Short Packet Codes 1 to 8, + * Generic Long Packet Data Types 1 to 4 YUV422 8-bit, + * RGB565, RGB888, RAW8 to RAW20, User-defined 8-bit + * data types 1 to 8 + */ + rzg2l_csi2_write(csi2, CSI2nDTEL, 0xf778ff0f); + rzg2l_csi2_write(csi2, CSI2nDTEH, 0x00ffff1f); + + /* Enable LINK reception */ + rzg2l_csi2_set(csi2, CSI2nMCT3, CSI2nMCT3_RXEN); + } else { + unsigned int timeout = VSRSTS_RETRIES; + + /* Stop LINK reception */ + rzg2l_csi2_clr(csi2, CSI2nMCT3, CSI2nMCT3_RXEN); + + /* Request a software reset of the LINK Video Pixel Interface */ + rzg2l_csi2_write(csi2, CSI2nRTCT, CSI2nRTCT_VSRST); + + /* Make sure CSI2nRTST.VSRSTS bit is cleared */ + while (timeout--) { + if (!(rzg2l_csi2_read(csi2, CSI2nRTST) & CSI2nRTST_VSRSTS)) + break; + usleep_range(100, 200); + }; + } +} +EXPORT_SYMBOL_GPL(rzg2l_csi2_mipi_link_setting); + +static int rzg2l_csi2_s_stream(struct v4l2_subdev *sd, int enable) +{ + struct rzg2l_csi2 *csi2 = sd_to_csi2(sd); + int ret = 0; + + mutex_lock(&csi2->lock); + + if (!csi2->remote) { + ret = -ENODEV; + goto out; + } + + if (enable && !csi2->stream_count) { + ret = v4l2_subdev_call(csi2->remote, video, s_stream, 1); + if (ret) + goto out; + } else if (!enable && csi2->stream_count == 1) { + v4l2_subdev_call(csi2->remote, video, s_stream, 0); + } + + csi2->stream_count += enable ? 1 : -1; +out: + mutex_unlock(&csi2->lock); + + return ret; +} + +static int rzg2l_csi2_set_format(struct v4l2_subdev *sd, + struct v4l2_subdev_state *state, + struct v4l2_subdev_format *format) +{ + struct rzg2l_csi2 *csi2 = sd_to_csi2(sd); + struct v4l2_mbus_framefmt *framefmt; + + mutex_lock(&csi2->lock); + + if (!rzg2l_csi2_code_to_fmt(format->format.code)) + format->format.code = rzg2l_csi2_formats[0].code; + + if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) { + csi2->mf = format->format; + } else { + framefmt = v4l2_subdev_get_try_format(sd, state, 0); + *framefmt = format->format; + } + + mutex_unlock(&csi2->lock); + + return 0; +} + +static int rzg2l_csi2_get_pad_format(struct v4l2_subdev *sd, + struct v4l2_subdev_state *sd_state, + struct v4l2_subdev_format *format) +{ + struct rzg2l_csi2 *csi2 = sd_to_csi2(sd); + + mutex_lock(&csi2->lock); + if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) + format->format = csi2->mf; + else + format->format = *v4l2_subdev_get_try_format(sd, sd_state, 0); + mutex_unlock(&csi2->lock); + + return 0; +} + +static const struct v4l2_subdev_video_ops rzg2l_csi2_video_ops = { + .s_stream = rzg2l_csi2_s_stream, +}; + +static const struct v4l2_subdev_pad_ops rzg2l_csi2_pad_ops = { + .set_fmt = rzg2l_csi2_set_format, + .get_fmt = rzg2l_csi2_get_pad_format, +}; + +static const struct v4l2_subdev_ops rzg2l_csi2_subdev_ops = { + .video = &rzg2l_csi2_video_ops, + .pad = &rzg2l_csi2_pad_ops, +}; + +/* ----------------------------------------------------------------------------- + * Async handling and registration of subdevices and links. + */ + +static int rzg2l_csi2_notify_bound(struct v4l2_async_notifier *notifier, + struct v4l2_subdev *subdev, + struct v4l2_async_subdev *asd) +{ + struct rzg2l_csi2 *csi2 = notifier_to_csi2(notifier); + int pad; + + pad = media_entity_get_fwnode_pad(&subdev->entity, asd->match.fwnode, + MEDIA_PAD_FL_SOURCE); + if (pad < 0) { + dev_err(csi2->dev, "Failed to find pad for %s\n", subdev->name); + return pad; + } + + csi2->remote = subdev; + + dev_dbg(csi2->dev, "Bound %s pad: %d\n", subdev->name, pad); + + return media_create_pad_link(&subdev->entity, pad, + &csi2->subdev.entity, 0, + MEDIA_LNK_FL_ENABLED | + MEDIA_LNK_FL_IMMUTABLE); +} + +static void rzg2l_csi2_notify_unbind(struct v4l2_async_notifier *notifier, + struct v4l2_subdev *subdev, + struct v4l2_async_subdev *asd) +{ + struct rzg2l_csi2 *csi2 = notifier_to_csi2(notifier); + + csi2->remote = NULL; + + dev_dbg(csi2->dev, "Unbind %s\n", subdev->name); +} + +static const struct v4l2_async_notifier_operations rzg2l_csi2_notify_ops = { + .bound = rzg2l_csi2_notify_bound, + .unbind = rzg2l_csi2_notify_unbind, +}; + +static int rzg2l_csi2_parse_v4l2(struct rzg2l_csi2 *csi2, + struct v4l2_fwnode_endpoint *vep) +{ + /* Only port 0 endpoint 0 is valid. */ + if (vep->base.port || vep->base.id) + return -ENOTCONN; + + if (vep->bus_type != V4L2_MBUS_CSI2_DPHY) { + dev_err(csi2->dev, "Unsupported bus: %u\n", vep->bus_type); + return -EINVAL; + } + + csi2->lanes = vep->bus.mipi_csi2.num_data_lanes; + if (csi2->lanes != 1 && csi2->lanes != 2 && csi2->lanes != 4) { + dev_err(csi2->dev, "Unsupported number of data-lanes: %u\n", + csi2->lanes); + return -EINVAL; + } + + return 0; +} + +static int rzg2l_csi2_parse_dt(struct rzg2l_csi2 *csi2) +{ + struct v4l2_fwnode_endpoint v4l2_ep = { + .bus_type = V4L2_MBUS_CSI2_DPHY + }; + struct v4l2_async_subdev *asd; + struct fwnode_handle *fwnode; + struct fwnode_handle *ep; + int ret; + + ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(csi2->dev), 0, 0, 0); + if (!ep) { + dev_err(csi2->dev, "Not connected to subdevice\n"); + return -EINVAL; + } + + ret = v4l2_fwnode_endpoint_parse(ep, &v4l2_ep); + if (ret) { + dev_err(csi2->dev, "Could not parse v4l2 endpoint\n"); + fwnode_handle_put(ep); + return -EINVAL; + } + + ret = rzg2l_csi2_parse_v4l2(csi2, &v4l2_ep); + if (ret) { + fwnode_handle_put(ep); + return ret; + } + + fwnode = fwnode_graph_get_remote_endpoint(ep); + fwnode_handle_put(ep); + + dev_dbg(csi2->dev, "Found '%pOF'\n", to_of_node(fwnode)); + + v4l2_async_nf_init(&csi2->notifier); + csi2->notifier.ops = &rzg2l_csi2_notify_ops; + + asd = v4l2_async_nf_add_fwnode(&csi2->notifier, fwnode, + struct v4l2_async_subdev); + fwnode_handle_put(fwnode); + if (IS_ERR(asd)) + return PTR_ERR(asd); + + ret = v4l2_async_subdev_nf_register(&csi2->subdev, &csi2->notifier); + if (ret) + v4l2_async_nf_cleanup(&csi2->notifier); + + return ret; +} + +/* ----------------------------------------------------------------------------- + * Platform Device Driver. + */ + +static const struct media_entity_operations rzg2l_csi2_entity_ops = { + .link_validate = v4l2_subdev_link_validate, +}; + +static int rzg2l_csi2_probe(struct platform_device *pdev) +{ + struct rzg2l_csi2 *csi2; + struct clk *vclk; + unsigned int i; + int ret; + + csi2 = devm_kzalloc(&pdev->dev, sizeof(*csi2), GFP_KERNEL); + if (!csi2) + return -ENOMEM; + + csi2->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(csi2->base)) + return PTR_ERR(csi2->base); + + csi2->rstc = devm_reset_control_get(&pdev->dev, "cmn-rstb"); + if (IS_ERR(csi2->rstc)) + return dev_err_probe(&pdev->dev, PTR_ERR(csi2->rstc), + "failed to get cpg cmn-rstb\n"); + + vclk = devm_clk_get(&pdev->dev, "vclk"); + if (IS_ERR(vclk)) + return dev_err_probe(&pdev->dev, PTR_ERR(vclk), + "failed to get vclk clock\n"); + + csi2->vclk_rate = clk_get_rate(vclk); + devm_clk_put(&pdev->dev, vclk); + + csi2->dev = &pdev->dev; + mutex_init(&csi2->lock); + csi2->stream_count = 0; + + platform_set_drvdata(pdev, csi2); + + ret = rzg2l_csi2_parse_dt(csi2); + if (ret) + goto error_mutex; + + csi2->subdev.owner = THIS_MODULE; + csi2->subdev.dev = &pdev->dev; + v4l2_subdev_init(&csi2->subdev, &rzg2l_csi2_subdev_ops); + v4l2_set_subdevdata(&csi2->subdev, &pdev->dev); + snprintf(csi2->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s %s", + KBUILD_MODNAME, dev_name(&pdev->dev)); + csi2->subdev.flags = V4L2_SUBDEV_FL_HAS_DEVNODE; + + csi2->subdev.entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER; + csi2->subdev.entity.ops = &rzg2l_csi2_entity_ops; + + csi2->pads[RZG2L_CSI2_SINK].flags = MEDIA_PAD_FL_SINK; + for (i = RZG2L_CSI2_SOURCE_VC0; i < NR_OF_RZG2L_CSI2_PAD; i++) + csi2->pads[i].flags = MEDIA_PAD_FL_SOURCE; + + ret = media_entity_pads_init(&csi2->subdev.entity, NR_OF_RZG2L_CSI2_PAD, csi2->pads); + if (ret) + goto error_async; + + pm_runtime_enable(&pdev->dev); + + ret = v4l2_subdev_init_finalize(&csi2->subdev); + if (ret < 0) + goto error_pm; + + ret = v4l2_async_register_subdev(&csi2->subdev); + if (ret < 0) + goto error_subdev; + + dev_info(csi2->dev, "%d lanes found\n", csi2->lanes); + + return 0; + +error_subdev: + v4l2_subdev_cleanup(&csi2->subdev); +error_pm: + pm_runtime_disable(&pdev->dev); +error_async: + v4l2_async_nf_unregister(&csi2->notifier); + v4l2_async_nf_cleanup(&csi2->notifier); +error_mutex: + mutex_destroy(&csi2->lock); + + return ret; +} + +static const struct of_device_id rzg2l_csi2_of_table[] = { + { .compatible = "renesas,rzg2l-csi2", }, + { /* sentinel */ } +}; + +static int rzg2l_csi2_remove(struct platform_device *pdev) +{ + struct rzg2l_csi2 *csi2 = platform_get_drvdata(pdev); + + v4l2_async_nf_unregister(&csi2->notifier); + v4l2_async_nf_cleanup(&csi2->notifier); + v4l2_async_unregister_subdev(&csi2->subdev); + v4l2_subdev_cleanup(&csi2->subdev); + + pm_runtime_disable(&pdev->dev); + mutex_destroy(&csi2->lock); + + return 0; +} + +static struct platform_driver rzg2l_csi2_pdrv = { + .remove = rzg2l_csi2_remove, + .probe = rzg2l_csi2_probe, + .driver = { + .name = "rzg2l-csi2", + .of_match_table = rzg2l_csi2_of_table, + }, +}; + +module_platform_driver(rzg2l_csi2_pdrv); + +MODULE_AUTHOR("Lad Prabhakar "); +MODULE_DESCRIPTION("Renesas RZ/G2L MIPI CSI2 receiver driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.h b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.h new file mode 100644 index 000000000000..7192923517f6 --- /dev/null +++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.h @@ -0,0 +1,49 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright (C) 2022 Renesas Electronics Corp. + */ + +#ifndef __RZG2L_CSI2__ +#define __RZG2L_CSI2__ + +enum rzg2l_csi2_pads { + RZG2L_CSI2_SINK = 0, + RZG2L_CSI2_SOURCE_VC0, + RZG2L_CSI2_SOURCE_VC1, + RZG2L_CSI2_SOURCE_VC2, + RZG2L_CSI2_SOURCE_VC3, + NR_OF_RZG2L_CSI2_PAD, +}; + +struct rzg2l_csi2 { + struct device *dev; + void __iomem *base; + struct reset_control *rstc; + unsigned long vclk_rate; + + struct v4l2_subdev subdev; + struct media_pad pads[NR_OF_RZG2L_CSI2_PAD]; + + struct v4l2_async_notifier notifier; + struct v4l2_subdev *remote; + + struct v4l2_mbus_framefmt mf; + + struct mutex lock; + int stream_count; + + unsigned short lanes; + + unsigned long hsfreq; +}; + +static inline struct rzg2l_csi2 *sd_to_csi2(struct v4l2_subdev *sd) +{ + return container_of(sd, struct rzg2l_csi2, subdev); +} + +int rzg2l_csi2_cmn_rstb_deassert(struct rzg2l_csi2 *csi2); +int rzg2l_csi2_dphy_setting(struct rzg2l_csi2 *csi2, bool on); +void rzg2l_csi2_mipi_link_setting(struct rzg2l_csi2 *csi2, bool on); + +#endif