From patchwork Thu Oct 17 13:43:32 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 11195975 X-Patchwork-Delegate: kieran@bingham.xyz Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BA5B314ED for ; Thu, 17 Oct 2019 13:41:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8B1DF214E0 for ; Thu, 17 Oct 2019 13:41:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2436668AbfJQNl4 (ORCPT ); Thu, 17 Oct 2019 09:41:56 -0400 Received: from relay2-d.mail.gandi.net ([217.70.183.194]:55631 "EHLO relay2-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2436617AbfJQNl4 (ORCPT ); Thu, 17 Oct 2019 09:41:56 -0400 X-Originating-IP: 2.224.242.101 Received: from uno.lan (2-224-242-101.ip172.fastwebnet.it [2.224.242.101]) (Authenticated sender: jacopo@jmondi.org) by relay2-d.mail.gandi.net (Postfix) with ESMTPSA id 7786C40005; Thu, 17 Oct 2019 13:41:51 +0000 (UTC) From: Jacopo Mondi To: laurent.pinchart@ideasonboard.com, kieran.bingham+renesas@ideasonboard.com, geert@linux-m68k.org, horms@verge.net.au, uli+renesas@fpond.eu Cc: Jacopo Mondi , airlied@linux.ie, daniel@ffwll.ch, linux-renesas-soc@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH 6.1 3/8] drm: rcar-du: Add support for CMM Date: Thu, 17 Oct 2019 15:43:32 +0200 Message-Id: <20191017134332.535677-1-jacopo+renesas@jmondi.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191016085548.105703-4-jacopo+renesas@jmondi.org> References: <20191016085548.105703-4-jacopo+renesas@jmondi.org> MIME-Version: 1.0 Sender: linux-renesas-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org Add a driver for the R-Car Display Unit Color Correction Module. In most of Gen3 SoCs, each DU output channel is provided with a CMM unit to perform image enhancement and color correction. Add support for CMM through a driver that supports configuration of the 1-dimensional LUT table. More advanced CMM features will be implemented on top of this initial one. Reviewed-by: Laurent Pinchart Reviewed-by: Kieran Bingham Signed-off-by: Jacopo Mondi Reviewed-by: Laurent Pinchart --- v6 -> v6.1 - Expand rcar_cmm_setup() function documentation to detail its relationship with rcar_cmm_enable() and their call order precedence. --- drivers/gpu/drm/rcar-du/Kconfig | 7 + drivers/gpu/drm/rcar-du/Makefile | 1 + drivers/gpu/drm/rcar-du/rcar_cmm.c | 217 +++++++++++++++++++++++++++++ drivers/gpu/drm/rcar-du/rcar_cmm.h | 58 ++++++++ 4 files changed, 283 insertions(+) create mode 100644 drivers/gpu/drm/rcar-du/rcar_cmm.c create mode 100644 drivers/gpu/drm/rcar-du/rcar_cmm.h -- 2.23.0 diff --git a/drivers/gpu/drm/rcar-du/Kconfig b/drivers/gpu/drm/rcar-du/Kconfig index 1529849e217e..539d232790d1 100644 --- a/drivers/gpu/drm/rcar-du/Kconfig +++ b/drivers/gpu/drm/rcar-du/Kconfig @@ -13,6 +13,13 @@ config DRM_RCAR_DU Choose this option if you have an R-Car chipset. If M is selected the module will be called rcar-du-drm. +config DRM_RCAR_CMM + bool "R-Car DU Color Management Module (CMM) Support" + depends on DRM && OF + depends on DRM_RCAR_DU + help + Enable support for R-Car Color Management Module (CMM). + config DRM_RCAR_DW_HDMI tristate "R-Car DU Gen3 HDMI Encoder Support" depends on DRM && OF diff --git a/drivers/gpu/drm/rcar-du/Makefile b/drivers/gpu/drm/rcar-du/Makefile index 6c2ed9c46467..4d1187ccc3e5 100644 --- a/drivers/gpu/drm/rcar-du/Makefile +++ b/drivers/gpu/drm/rcar-du/Makefile @@ -15,6 +15,7 @@ rcar-du-drm-$(CONFIG_DRM_RCAR_LVDS) += rcar_du_of.o \ rcar-du-drm-$(CONFIG_DRM_RCAR_VSP) += rcar_du_vsp.o rcar-du-drm-$(CONFIG_DRM_RCAR_WRITEBACK) += rcar_du_writeback.o +obj-$(CONFIG_DRM_RCAR_CMM) += rcar_cmm.o obj-$(CONFIG_DRM_RCAR_DU) += rcar-du-drm.o obj-$(CONFIG_DRM_RCAR_DW_HDMI) += rcar_dw_hdmi.o obj-$(CONFIG_DRM_RCAR_LVDS) += rcar_lvds.o diff --git a/drivers/gpu/drm/rcar-du/rcar_cmm.c b/drivers/gpu/drm/rcar-du/rcar_cmm.c new file mode 100644 index 000000000000..952316eb202b --- /dev/null +++ b/drivers/gpu/drm/rcar-du/rcar_cmm.c @@ -0,0 +1,217 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * rcar_cmm.c -- R-Car Display Unit Color Management Module + * + * Copyright (C) 2019 Jacopo Mondi + */ + +#include +#include +#include +#include +#include + +#include + +#include "rcar_cmm.h" + +#define CM2_LUT_CTRL 0x0000 +#define CM2_LUT_CTRL_LUT_EN BIT(0) +#define CM2_LUT_TBL_BASE 0x0600 +#define CM2_LUT_TBL(__i) (CM2_LUT_TBL_BASE + (__i) * 4) + +struct rcar_cmm { + void __iomem *base; + + /* + * @lut: 1D-LUT state + * @lut.enabled: 1D-LUT enabled flag + */ + struct { + bool enabled; + } lut; +}; + +static inline int rcar_cmm_read(struct rcar_cmm *rcmm, u32 reg) +{ + return ioread32(rcmm->base + reg); +} + +static inline void rcar_cmm_write(struct rcar_cmm *rcmm, u32 reg, u32 data) +{ + iowrite32(data, rcmm->base + reg); +} + +/* + * rcar_cmm_lut_write() - Scale the DRM LUT table entries to hardware precision + * and write to the CMM registers + * @rcmm: Pointer to the CMM device + * @drm_lut: Pointer to the DRM LUT table + */ +static void rcar_cmm_lut_write(struct rcar_cmm *rcmm, + const struct drm_color_lut *drm_lut) +{ + unsigned int i; + + for (i = 0; i < CM2_LUT_SIZE; ++i) { + u32 entry = drm_color_lut_extract(drm_lut[i].red, 8) << 16 + | drm_color_lut_extract(drm_lut[i].green, 8) << 8 + | drm_color_lut_extract(drm_lut[i].blue, 8); + + rcar_cmm_write(rcmm, CM2_LUT_TBL(i), entry); + } +} + +/* + * rcar_cmm_setup() - Configure the CMM unit + * @pdev: The platform device associated with the CMM instance + * @config: The CMM unit configuration + * + * Configure the CMM unit with the given configuration. Currently enabling, + * disabling and programming of the 1-D LUT unit is supported. + * + * As rcar_cmm_setup() accesses the CMM registers the unit should be powered + * and its functional clock enabled. To guarantee this, before any call to + * this function is made, the CMM unit has to be enabled by calling + * rcar_cmm_enable() first. + * + * TODO: Add support for LUT double buffer operations to avoid updating the + * LUT table entries while a frame is being displayed. + */ +int rcar_cmm_setup(struct platform_device *pdev, + const struct rcar_cmm_config *config) +{ + struct rcar_cmm *rcmm = platform_get_drvdata(pdev); + + /* Disable LUT if no table is provided. */ + if (!config->lut.table) { + if (rcmm->lut.enabled) { + rcar_cmm_write(rcmm, CM2_LUT_CTRL, 0); + rcmm->lut.enabled = false; + } + + return 0; + } + + /* Enable LUT and program the new gamma table values. */ + if (!rcmm->lut.enabled) { + rcar_cmm_write(rcmm, CM2_LUT_CTRL, CM2_LUT_CTRL_LUT_EN); + rcmm->lut.enabled = true; + } + + rcar_cmm_lut_write(rcmm, config->lut.table); + + return 0; +} +EXPORT_SYMBOL_GPL(rcar_cmm_setup); + +/* + * rcar_cmm_enable() - Enable the CMM unit + * @pdev: The platform device associated with the CMM instance + * + * When the output of the corresponding DU channel is routed to the CMM unit, + * the unit shall be enabled before the DU channel is started, and remain + * enabled until the channel is stopped. The CMM unit shall be disabled with + * rcar_cmm_disable(). + * + * Calls to rcar_cmm_enable() and rcar_cmm_disable() are not reference-counted. + * It is an error to attempt to enable an already enabled CMM unit, or to + * attempt to disable a disabled unit. + */ +int rcar_cmm_enable(struct platform_device *pdev) +{ + int ret; + + ret = pm_runtime_get_sync(&pdev->dev); + if (ret < 0) + return ret; + + return 0; +} +EXPORT_SYMBOL_GPL(rcar_cmm_enable); + +/* + * rcar_cmm_disable() - Disable the CMM unit + * @pdev: The platform device associated with the CMM instance + * + * See rcar_cmm_enable() for usage information. + * + * Disabling the CMM unit disable all the internal processing blocks. The CMM + * state shall thus be restored with rcar_cmm_setup() when re-enabling the CMM + * unit after the next rcar_cmm_enable() call. + */ +void rcar_cmm_disable(struct platform_device *pdev) +{ + struct rcar_cmm *rcmm = platform_get_drvdata(pdev); + + rcar_cmm_write(rcmm, CM2_LUT_CTRL, 0); + rcmm->lut.enabled = false; + + pm_runtime_put(&pdev->dev); +} +EXPORT_SYMBOL_GPL(rcar_cmm_disable); + +/* + * rcar_cmm_init() - Initialize the CMM unit + * @pdev: The platform device associated with the CMM instance + * + * Return: 0 on success, -EPROBE_DEFER if the CMM is not available yet, + * -ENODEV if the DRM_RCAR_CMM config option is disabled + */ +int rcar_cmm_init(struct platform_device *pdev) +{ + struct rcar_cmm *rcmm = platform_get_drvdata(pdev); + + if (!rcmm) + return -EPROBE_DEFER; + + return 0; +} +EXPORT_SYMBOL_GPL(rcar_cmm_init); + +static int rcar_cmm_probe(struct platform_device *pdev) +{ + struct rcar_cmm *rcmm; + + rcmm = devm_kzalloc(&pdev->dev, sizeof(*rcmm), GFP_KERNEL); + if (!rcmm) + return -ENOMEM; + platform_set_drvdata(pdev, rcmm); + + rcmm->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(rcmm->base)) + return PTR_ERR(rcmm->base); + + pm_runtime_enable(&pdev->dev); + + return 0; +} + +static int rcar_cmm_remove(struct platform_device *pdev) +{ + pm_runtime_disable(&pdev->dev); + + return 0; +} + +static const struct of_device_id rcar_cmm_of_table[] = { + { .compatible = "renesas,rcar-gen3-cmm", }, + { .compatible = "renesas,rcar-gen2-cmm", }, + { }, +}; +MODULE_DEVICE_TABLE(of, rcar_cmm_of_table); + +static struct platform_driver rcar_cmm_platform_driver = { + .probe = rcar_cmm_probe, + .remove = rcar_cmm_remove, + .driver = { + .name = "rcar-cmm", + .of_match_table = rcar_cmm_of_table, + }, +}; + +module_platform_driver(rcar_cmm_platform_driver); + +MODULE_AUTHOR("Jacopo Mondi "); +MODULE_DESCRIPTION("Renesas R-Car CMM Driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/gpu/drm/rcar-du/rcar_cmm.h b/drivers/gpu/drm/rcar-du/rcar_cmm.h new file mode 100644 index 000000000000..b5f7ec6db04a --- /dev/null +++ b/drivers/gpu/drm/rcar-du/rcar_cmm.h @@ -0,0 +1,58 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * rcar_cmm.h -- R-Car Display Unit Color Management Module + * + * Copyright (C) 2019 Jacopo Mondi + */ + +#ifndef __RCAR_CMM_H__ +#define __RCAR_CMM_H__ + +#define CM2_LUT_SIZE 256 + +struct drm_color_lut; +struct platform_device; + +/** + * struct rcar_cmm_config - CMM configuration + * + * @lut: 1D-LUT configuration + * @lut.table: 1D-LUT table entries. Disable LUT operations when NULL + */ +struct rcar_cmm_config { + struct { + struct drm_color_lut *table; + } lut; +}; + +#if IS_ENABLED(CONFIG_DRM_RCAR_CMM) +int rcar_cmm_init(struct platform_device *pdev); + +int rcar_cmm_enable(struct platform_device *pdev); +void rcar_cmm_disable(struct platform_device *pdev); + +int rcar_cmm_setup(struct platform_device *pdev, + const struct rcar_cmm_config *config); +#else +static inline int rcar_cmm_init(struct platform_device *pdev) +{ + return -ENODEV; +} + +static inline int rcar_cmm_enable(struct platform_device *pdev) +{ + return 0; +} + +static inline void rcar_cmm_disable(struct platform_device *pdev) +{ +} + +static inline int rcar_cmm_setup(struct platform_device *pdev, + const struct rcar_cmm_config *config) +{ + return 0; +} +#endif /* IS_ENABLED(CONFIG_DRM_RCAR_CMM) */ + +#endif /* __RCAR_CMM_H__ */ From patchwork Thu Oct 17 13:44:09 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 11195977 X-Patchwork-Delegate: kieran@bingham.xyz Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 80B2C14ED for ; Thu, 17 Oct 2019 13:42:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5D93D214E0 for ; Thu, 17 Oct 2019 13:42:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2436694AbfJQNmd (ORCPT ); Thu, 17 Oct 2019 09:42:33 -0400 Received: from relay8-d.mail.gandi.net ([217.70.183.201]:56249 "EHLO relay8-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2436617AbfJQNmc (ORCPT ); Thu, 17 Oct 2019 09:42:32 -0400 X-Originating-IP: 2.224.242.101 Received: from uno.lan (2-224-242-101.ip172.fastwebnet.it [2.224.242.101]) (Authenticated sender: jacopo@jmondi.org) by relay8-d.mail.gandi.net (Postfix) with ESMTPSA id 0EAFE1BF207; Thu, 17 Oct 2019 13:42:25 +0000 (UTC) From: Jacopo Mondi To: laurent.pinchart@ideasonboard.com, kieran.bingham+renesas@ideasonboard.com, geert@linux-m68k.org, horms@verge.net.au, uli+renesas@fpond.eu Cc: Jacopo Mondi , airlied@linux.ie, daniel@ffwll.ch, linux-renesas-soc@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH v6.1 5/8] drm: rcar-du: crtc: Control CMM operations Date: Thu, 17 Oct 2019 15:44:09 +0200 Message-Id: <20191017134409.535740-1-jacopo+renesas@jmondi.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191016085548.105703-6-jacopo+renesas@jmondi.org> References: <20191016085548.105703-6-jacopo+renesas@jmondi.org> MIME-Version: 1.0 Sender: linux-renesas-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org Implement CMM handling in the crtc begin and enable atomic callbacks, and enable CMM unit through the Display Extensional Functions register at group setup time. Reviewed-by: Laurent Pinchart Reviewed-by: Kieran Bingham Signed-off-by: Jacopo Mondi Reviewed-by: Laurent Pinchart --- v6 -> v6.1 - Drop check for CMM in rcar_du_cmm_check as if the gamma_table property is available, a CMM unit for this CRTC was registered - Add TODO note to investigate how the activation order of CMM and CRTC impact on the first displayed fram --- drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 61 +++++++++++++++++++++++++ drivers/gpu/drm/rcar-du/rcar_du_group.c | 10 ++++ drivers/gpu/drm/rcar-du/rcar_du_regs.h | 5 ++ 3 files changed, 76 insertions(+) -- 2.23.0 diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c index 23f1d6cc1719..3f0f16946f42 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c @@ -21,6 +21,7 @@ #include #include +#include "rcar_cmm.h" #include "rcar_du_crtc.h" #include "rcar_du_drv.h" #include "rcar_du_encoder.h" @@ -474,6 +475,45 @@ static void rcar_du_crtc_wait_page_flip(struct rcar_du_crtc *rcrtc) rcar_du_crtc_finish_page_flip(rcrtc); } +/* ----------------------------------------------------------------------------- + * Color Management Module (CMM) + */ + +static int rcar_du_cmm_check(struct drm_crtc *crtc, + struct drm_crtc_state *state) +{ + struct drm_property_blob *drm_lut = state->gamma_lut; + struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc); + struct device *dev = rcrtc->dev->dev; + + if (!drm_lut) + return 0; + + /* We only accept fully populated LUT tables. */ + if (drm_color_lut_size(drm_lut) != CM2_LUT_SIZE) { + dev_err(dev, "invalid gamma lut size: %lu bytes\n", + drm_lut->length); + return -EINVAL; + } + + return 0; +} + +static void rcar_du_cmm_setup(struct drm_crtc *crtc) +{ + struct drm_property_blob *drm_lut = crtc->state->gamma_lut; + struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc); + struct rcar_cmm_config cmm_config = {}; + + if (!rcrtc->cmm) + return; + + if (drm_lut) + cmm_config.lut.table = (struct drm_color_lut *)drm_lut->data; + + rcar_cmm_setup(rcrtc->cmm, &cmm_config); +} + /* ----------------------------------------------------------------------------- * Start/Stop and Suspend/Resume */ @@ -619,6 +659,9 @@ static void rcar_du_crtc_stop(struct rcar_du_crtc *rcrtc) if (rcar_du_has(rcrtc->dev, RCAR_DU_FEATURE_VSP1_SOURCE)) rcar_du_vsp_disable(rcrtc); + if (rcrtc->cmm) + rcar_cmm_disable(rcrtc->cmm); + /* * Select switch sync mode. This stops display operation and configures * the HSYNC and VSYNC signals as inputs. @@ -642,6 +685,11 @@ static int rcar_du_crtc_atomic_check(struct drm_crtc *crtc, { struct rcar_du_crtc_state *rstate = to_rcar_crtc_state(state); struct drm_encoder *encoder; + int ret; + + ret = rcar_du_cmm_check(crtc, state); + if (ret) + return ret; /* Store the routes from the CRTC output to the DU outputs. */ rstate->outputs = 0; @@ -667,6 +715,8 @@ static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc, struct rcar_du_crtc_state *rstate = to_rcar_crtc_state(crtc->state); struct rcar_du_device *rcdu = rcrtc->dev; + if (rcrtc->cmm) + rcar_cmm_enable(rcrtc->cmm); rcar_du_crtc_get(rcrtc); /* @@ -686,6 +736,13 @@ static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc, } rcar_du_crtc_start(rcrtc); + + /* + * TODO: The chip manual indicates that CMM tables should be written + * after the DU channel has been activated. Investigate the impact + * of this restriction on the first displayed frame. + */ + rcar_du_cmm_setup(crtc); } static void rcar_du_crtc_atomic_disable(struct drm_crtc *crtc, @@ -739,6 +796,10 @@ static void rcar_du_crtc_atomic_begin(struct drm_crtc *crtc, */ rcar_du_crtc_get(rcrtc); + /* If the active state changed, we let .atomic_enable handle CMM. */ + if (crtc->state->color_mgmt_changed && !crtc->state->active_changed) + rcar_du_cmm_setup(crtc); + if (rcar_du_has(rcrtc->dev, RCAR_DU_FEATURE_VSP1_SOURCE)) rcar_du_vsp_atomic_begin(rcrtc); } diff --git a/drivers/gpu/drm/rcar-du/rcar_du_group.c b/drivers/gpu/drm/rcar-du/rcar_du_group.c index 9eee47969e77..88a783ceb3e9 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_group.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_group.c @@ -135,6 +135,7 @@ static void rcar_du_group_setup_didsr(struct rcar_du_group *rgrp) static void rcar_du_group_setup(struct rcar_du_group *rgrp) { struct rcar_du_device *rcdu = rgrp->dev; + u32 defr7 = DEFR7_CODE; /* Enable extended features */ rcar_du_group_write(rgrp, DEFR, DEFR_CODE | DEFR_DEFE); @@ -147,6 +148,15 @@ static void rcar_du_group_setup(struct rcar_du_group *rgrp) rcar_du_group_setup_pins(rgrp); + /* + * TODO: Handle routing of the DU output to CMM dynamically, as we + * should bypass CMM completely when no color management feature is + * used. + */ + defr7 |= (rgrp->cmms_mask & BIT(1) ? DEFR7_CMME1 : 0) | + (rgrp->cmms_mask & BIT(0) ? DEFR7_CMME0 : 0); + rcar_du_group_write(rgrp, DEFR7, defr7); + if (rcdu->info->gen >= 2) { rcar_du_group_setup_defr8(rgrp); rcar_du_group_setup_didsr(rgrp); diff --git a/drivers/gpu/drm/rcar-du/rcar_du_regs.h b/drivers/gpu/drm/rcar-du/rcar_du_regs.h index bc87f080b170..fb9964949368 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_regs.h +++ b/drivers/gpu/drm/rcar-du/rcar_du_regs.h @@ -197,6 +197,11 @@ #define DEFR6_MLOS1 (1 << 2) #define DEFR6_DEFAULT (DEFR6_CODE | DEFR6_TCNE1) +#define DEFR7 0x000ec +#define DEFR7_CODE (0x7779 << 16) +#define DEFR7_CMME1 BIT(6) +#define DEFR7_CMME0 BIT(4) + /* ----------------------------------------------------------------------------- * R8A7790-only Control Registers */