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([2a02:1210:861b:6f00:82ee:73ff:feb8:99e3]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38dbf2ed900sm10386544f8f.53.2025.02.09.14.07.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 09 Feb 2025 14:07:12 -0800 (PST) From: Alexander Sverdlin To: soc@lists.linux.dev Cc: Alexander Sverdlin , Chen Wang , Inochi Amaoto , linux-pm@vger.kernel.org, linux-riscv@lists.infradead.org, Haylen Chu , linux-arm-kernel@lists.infradead.org, Sebastian Reichel , Arnd Bergmann , Philipp Zabel , Lee Jones Subject: [PATCH 09/10] power: reset: cv18xx: New driver Date: Sun, 9 Feb 2025 23:06:34 +0100 Message-ID: <20250209220646.1090868-10-alexander.sverdlin@gmail.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250209220646.1090868-1-alexander.sverdlin@gmail.com> References: <20250209220646.1090868-1-alexander.sverdlin@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250209_140715_151498_AF4C8DF2 X-CRM114-Status: GOOD ( 20.89 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Add new driver to support cold and warm reset on Cvitek CV18xx and Sophgo SG2000 SoCs. Link: https://github.com/sophgo/sophgo-doc/releases/download/sg2000-trm-v1.01/sg2000_trm_en.pdf Signed-off-by: Alexander Sverdlin --- MAINTAINERS | 1 + drivers/power/reset/Kconfig | 12 ++++ drivers/power/reset/Makefile | 1 + drivers/power/reset/cv18xx-reset.c | 89 ++++++++++++++++++++++++++++++ 4 files changed, 103 insertions(+) create mode 100644 drivers/power/reset/cv18xx-reset.c diff --git a/MAINTAINERS b/MAINTAINERS index e4f5d8f68581..b7fec02f7673 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -22147,6 +22147,7 @@ M: Chen Wang M: Inochi Amaoto T: git https://github.com/sophgo/linux.git S: Maintained +F: drivers/power/reset/cv18xx-reset.c N: sophgo K: sophgo diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index 60bf0ca64cf3..d41ed3c2a30d 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -75,6 +75,18 @@ config POWER_RESET_BRCMSTB Say Y here if you have a Broadcom STB board and you wish to have restart support. +config POWER_RESET_CV18XX + bool "Cvitek CV18XX/Sophgo SG2000 reset driver" + depends on ARCH_SOPHGO || COMPILE_TEST + depends on MFD_SYSCON + default ARCH_SOPHGO + help + This driver provides restart support for Cvitek CV18xx and + Sophgo SG2000 SoCs. + + Say Y here if you have a Cvitek CV18xx or Sophgo SG2000 SoC and + you wish to have restart support. + config POWER_RESET_EP93XX bool "Cirrus EP93XX reset driver" if COMPILE_TEST depends on MFD_SYSCON diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index 10782d32e1da..ce24e74e0477 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -7,6 +7,7 @@ obj-$(CONFIG_POWER_RESET_ATC260X) += atc260x-poweroff.o obj-$(CONFIG_POWER_RESET_AXXIA) += axxia-reset.o obj-$(CONFIG_POWER_RESET_BRCMKONA) += brcm-kona-reset.o obj-$(CONFIG_POWER_RESET_BRCMSTB) += brcmstb-reboot.o +obj-$(CONFIG_POWER_RESET_CV18XX) += cv18xx-reset.o obj-$(CONFIG_POWER_RESET_EP93XX) += ep93xx-restart.o obj-$(CONFIG_POWER_RESET_GEMINI_POWEROFF) += gemini-poweroff.o obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o diff --git a/drivers/power/reset/cv18xx-reset.c b/drivers/power/reset/cv18xx-reset.c new file mode 100644 index 000000000000..bc1797e7d3f5 --- /dev/null +++ b/drivers/power/reset/cv18xx-reset.c @@ -0,0 +1,89 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include +#include +#include +#include +#include +#include +#include +#include + +/* RTCSYS_CTRL registers */ +#define RTC_CTRL_UNLOCKKEY 0x04 +#define RTC_CTRL0 0x08 +#define REQ_PWR_CYC BIT(3) +#define REQ_WARM_RST BIT(4) + +/* RTCSYS_CORE registers */ +#define RTC_EN_PWR_CYC_REQ 0xC8 +#define RTC_EN_WARM_RST_REQ 0xCC + +static struct regmap *rtcsys_ctrl_regs; +static struct regmap *rtcsys_core_regs; + +static int cv18xx_restart_handler(struct sys_off_data *data) +{ + u32 reg_en = RTC_EN_WARM_RST_REQ; + u32 request = 0xFFFF0800; + + if (data->mode == REBOOT_COLD) { + reg_en = RTC_EN_PWR_CYC_REQ; + request |= REQ_PWR_CYC; + } else { + request |= REQ_WARM_RST; + } + + /* Enable reset request */ + regmap_write(rtcsys_core_regs, reg_en, 1); + /* Enable CTRL0 register access */ + regmap_write(rtcsys_ctrl_regs, RTC_CTRL_UNLOCKKEY, 0xAB18); + /* Request reset */ + regmap_write(rtcsys_ctrl_regs, RTC_CTRL0, request); + + return NOTIFY_DONE; +} + +static int cv18xx_reset_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + int ret; + + if (!np) + return -ENODEV; + + rtcsys_ctrl_regs = syscon_regmap_lookup_by_phandle(np, "sophgo,rtcsys-ctrl"); + if (IS_ERR(rtcsys_ctrl_regs)) + return dev_err_probe(dev, PTR_ERR(rtcsys_ctrl_regs), + "sophgo,rtcsys-ctrl lookup failed\n"); + + rtcsys_core_regs = syscon_regmap_lookup_by_phandle(np, "sophgo,rtcsys-core"); + if (IS_ERR(rtcsys_core_regs)) + return dev_err_probe(dev, PTR_ERR(rtcsys_core_regs), + "sophgo,rtcsys-core lookup failed\n"); + + ret = devm_register_restart_handler(&pdev->dev, cv18xx_restart_handler, NULL); + if (ret) + dev_err(&pdev->dev, "Cannot register restart handler (%pe)\n", ERR_PTR(ret)); + return ret; +} + +static const struct of_device_id cv18xx_reset_of_match[] = { + { .compatible = "sophgo,cv1800-reset" }, + {} +}; +MODULE_DEVICE_TABLE(platform, cv18xx_reset_of_match); + +static struct platform_driver cv18xx_reset_driver = { + .probe = cv18xx_reset_probe, + .driver = { + .name = "cv18xx-reset", + .of_match_table = cv18xx_reset_of_match, + }, +}; +module_platform_driver(cv18xx_reset_driver); + +MODULE_AUTHOR("Alexander Sverdlin "); +MODULE_DESCRIPTION("Cvitek CV18xx/Sophgo SG2000 Reset Driver"); +MODULE_ALIAS("platform:cv18xx-reset");