From: Kwanghoon Son <k.son@samsung.com> To: p.zabel@pengutronix.de, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, jszhang@kernel.org, guoren@kernel.org, wefu@redhat.com, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, inki.dae@samsung.com Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Subject: [PATCH v3 2/3] reset: Add th1520 reset driver support Date: Mon, 18 Sep 2023 04:51:24 +0000 [thread overview] Message-ID: <20230918045125.4000083-3-k.son@samsung.com> (raw) In-Reply-To: <20230918045125.4000083-1-k.son@samsung.com> This driver supports th1520 T-HEAD SoC reset platform device. Signed-off-by: Kwanghoon Son <k.son@samsung.com> --- drivers/reset/Kconfig | 10 ++++ drivers/reset/Makefile | 1 + drivers/reset/reset-th1520.c | 109 +++++++++++++++++++++++++++++++++++ 3 files changed, 120 insertions(+) create mode 100644 drivers/reset/reset-th1520.c diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index ccd59ddd7610..ec69e6bbba6e 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -253,6 +253,16 @@ config RESET_SUNXI help This enables the reset driver for Allwinner SoCs. +config RESET_TH1520 + bool "TH1520 Reset Driver" + depends on (ARCH_THEAD || COMPILE_TEST) && OF + select MFD_SYSCON + default ARCH_THEAD + help + Support for the T-HEAD 1520 RISC-V SoC reset controller. + Say Y if you want to control reset signals provided by this + controller. + config RESET_TI_SCI tristate "TI System Control Interface (TI-SCI) reset driver" depends on TI_SCI_PROTOCOL || (COMPILE_TEST && TI_SCI_PROTOCOL=n) diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 8270da8a4baa..5c858e62241a 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -33,6 +33,7 @@ obj-$(CONFIG_RESET_SIMPLE) += reset-simple.o obj-$(CONFIG_RESET_SOCFPGA) += reset-socfpga.o obj-$(CONFIG_RESET_SUNPLUS) += reset-sunplus.o obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o +obj-$(CONFIG_RESET_TH1520) += reset-th1520.o obj-$(CONFIG_RESET_TI_SCI) += reset-ti-sci.o obj-$(CONFIG_RESET_TI_SYSCON) += reset-ti-syscon.o obj-$(CONFIG_RESET_TI_TPS380X) += reset-tps380x.o diff --git a/drivers/reset/reset-th1520.c b/drivers/reset/reset-th1520.c new file mode 100644 index 000000000000..5a89d201fc0c --- /dev/null +++ b/drivers/reset/reset-th1520.c @@ -0,0 +1,109 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include <linux/mfd/syscon.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/reset-controller.h> +#include <linux/regmap.h> +#include <dt-bindings/reset/thead,th1520-reset.h> + +struct th1520_rst_signal { + unsigned int offset, bit; +}; + +struct th1520_rst { + struct reset_controller_dev rcdev; + struct regmap *regmap; + const struct th1520_rst_signal *signals; +}; + +enum th1520_rst_registers { + RST_WDT0 = 0x0034, + RST_WDT1 = 0x0038, +}; + +static int th1520_reset_update(struct th1520_rst *rst, unsigned long id, + unsigned int value) +{ + const struct th1520_rst_signal *signal = &rst->signals[id]; + + return regmap_update_bits(rst->regmap, signal->offset, signal->bit, + value); +} + +static const struct th1520_rst_signal th1520_rst_signals[] = { + [TH1520_RESET_WDT0] = { RST_WDT0, BIT(0) }, + [TH1520_RESET_WDT1] = { RST_WDT1, BIT(0) }, +}; + +static struct th1520_rst *to_th1520_rst(struct reset_controller_dev *rcdev) +{ + return container_of(rcdev, struct th1520_rst, rcdev); +} + +static int th1520_reset_set(struct reset_controller_dev *rcdev, + unsigned long id, bool assert) +{ + struct th1520_rst *rst = to_th1520_rst(rcdev); + const unsigned int bit = rst->signals[id].bit; + unsigned int value = assert ? bit : 0; + + return th1520_reset_update(rst, id, value); +} + +static int th1520_reset_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + return th1520_reset_set(rcdev, id, false); +} + +static int th1520_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + return th1520_reset_set(rcdev, id, true); +} + +static const struct reset_control_ops th1520_rst_ops = { + .assert = th1520_reset_assert, + .deassert = th1520_reset_deassert, +}; + +static int th1520_reset_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct th1520_rst *rst; + struct regmap_config config = { .name = "rst" }; + + rst = devm_kzalloc(dev, sizeof(*rst), GFP_KERNEL); + if (!rst) + return -ENOMEM; + + rst->signals = th1520_rst_signals; + rst->regmap = syscon_node_to_regmap(dev->of_node); + if (IS_ERR(rst->regmap)) + return PTR_ERR(rst->regmap); + + regmap_attach_dev(dev, rst->regmap, &config); + + rst->rcdev.owner = THIS_MODULE; + rst->rcdev.dev = dev; + rst->rcdev.of_node = dev->of_node; + rst->rcdev.ops = &th1520_rst_ops; + rst->rcdev.nr_resets = ARRAY_SIZE(th1520_rst_signals); + + return devm_reset_controller_register(dev, &rst->rcdev); +} + +static const struct of_device_id th1520_reset_dt_ids[] = { + { .compatible = "thead,th1520-reset" }, + { /* sentinel */ }, +}; + +static struct platform_driver th1520_reset_driver = { + .probe = th1520_reset_probe, + .driver = { + .name = "th1520-reset", + .of_match_table = th1520_reset_dt_ids, + }, +}; +builtin_platform_driver(th1520_reset_driver); -- 2.34.1 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv
WARNING: multiple messages have this Message-ID (diff)
From: Kwanghoon Son <k.son@samsung.com> To: p.zabel@pengutronix.de, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, jszhang@kernel.org, guoren@kernel.org, wefu@redhat.com, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, inki.dae@samsung.com Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Subject: [PATCH v3 2/3] reset: Add th1520 reset driver support Date: Mon, 18 Sep 2023 04:51:24 +0000 [thread overview] Message-ID: <20230918045125.4000083-3-k.son@samsung.com> (raw) In-Reply-To: <20230918045125.4000083-1-k.son@samsung.com> This driver supports th1520 T-HEAD SoC reset platform device. Signed-off-by: Kwanghoon Son <k.son@samsung.com> --- drivers/reset/Kconfig | 10 ++++ drivers/reset/Makefile | 1 + drivers/reset/reset-th1520.c | 109 +++++++++++++++++++++++++++++++++++ 3 files changed, 120 insertions(+) create mode 100644 drivers/reset/reset-th1520.c diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index ccd59ddd7610..ec69e6bbba6e 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -253,6 +253,16 @@ config RESET_SUNXI help This enables the reset driver for Allwinner SoCs. +config RESET_TH1520 + bool "TH1520 Reset Driver" + depends on (ARCH_THEAD || COMPILE_TEST) && OF + select MFD_SYSCON + default ARCH_THEAD + help + Support for the T-HEAD 1520 RISC-V SoC reset controller. + Say Y if you want to control reset signals provided by this + controller. + config RESET_TI_SCI tristate "TI System Control Interface (TI-SCI) reset driver" depends on TI_SCI_PROTOCOL || (COMPILE_TEST && TI_SCI_PROTOCOL=n) diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 8270da8a4baa..5c858e62241a 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -33,6 +33,7 @@ obj-$(CONFIG_RESET_SIMPLE) += reset-simple.o obj-$(CONFIG_RESET_SOCFPGA) += reset-socfpga.o obj-$(CONFIG_RESET_SUNPLUS) += reset-sunplus.o obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o +obj-$(CONFIG_RESET_TH1520) += reset-th1520.o obj-$(CONFIG_RESET_TI_SCI) += reset-ti-sci.o obj-$(CONFIG_RESET_TI_SYSCON) += reset-ti-syscon.o obj-$(CONFIG_RESET_TI_TPS380X) += reset-tps380x.o diff --git a/drivers/reset/reset-th1520.c b/drivers/reset/reset-th1520.c new file mode 100644 index 000000000000..5a89d201fc0c --- /dev/null +++ b/drivers/reset/reset-th1520.c @@ -0,0 +1,109 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include <linux/mfd/syscon.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/reset-controller.h> +#include <linux/regmap.h> +#include <dt-bindings/reset/thead,th1520-reset.h> + +struct th1520_rst_signal { + unsigned int offset, bit; +}; + +struct th1520_rst { + struct reset_controller_dev rcdev; + struct regmap *regmap; + const struct th1520_rst_signal *signals; +}; + +enum th1520_rst_registers { + RST_WDT0 = 0x0034, + RST_WDT1 = 0x0038, +}; + +static int th1520_reset_update(struct th1520_rst *rst, unsigned long id, + unsigned int value) +{ + const struct th1520_rst_signal *signal = &rst->signals[id]; + + return regmap_update_bits(rst->regmap, signal->offset, signal->bit, + value); +} + +static const struct th1520_rst_signal th1520_rst_signals[] = { + [TH1520_RESET_WDT0] = { RST_WDT0, BIT(0) }, + [TH1520_RESET_WDT1] = { RST_WDT1, BIT(0) }, +}; + +static struct th1520_rst *to_th1520_rst(struct reset_controller_dev *rcdev) +{ + return container_of(rcdev, struct th1520_rst, rcdev); +} + +static int th1520_reset_set(struct reset_controller_dev *rcdev, + unsigned long id, bool assert) +{ + struct th1520_rst *rst = to_th1520_rst(rcdev); + const unsigned int bit = rst->signals[id].bit; + unsigned int value = assert ? bit : 0; + + return th1520_reset_update(rst, id, value); +} + +static int th1520_reset_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + return th1520_reset_set(rcdev, id, false); +} + +static int th1520_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + return th1520_reset_set(rcdev, id, true); +} + +static const struct reset_control_ops th1520_rst_ops = { + .assert = th1520_reset_assert, + .deassert = th1520_reset_deassert, +}; + +static int th1520_reset_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct th1520_rst *rst; + struct regmap_config config = { .name = "rst" }; + + rst = devm_kzalloc(dev, sizeof(*rst), GFP_KERNEL); + if (!rst) + return -ENOMEM; + + rst->signals = th1520_rst_signals; + rst->regmap = syscon_node_to_regmap(dev->of_node); + if (IS_ERR(rst->regmap)) + return PTR_ERR(rst->regmap); + + regmap_attach_dev(dev, rst->regmap, &config); + + rst->rcdev.owner = THIS_MODULE; + rst->rcdev.dev = dev; + rst->rcdev.of_node = dev->of_node; + rst->rcdev.ops = &th1520_rst_ops; + rst->rcdev.nr_resets = ARRAY_SIZE(th1520_rst_signals); + + return devm_reset_controller_register(dev, &rst->rcdev); +} + +static const struct of_device_id th1520_reset_dt_ids[] = { + { .compatible = "thead,th1520-reset" }, + { /* sentinel */ }, +}; + +static struct platform_driver th1520_reset_driver = { + .probe = th1520_reset_probe, + .driver = { + .name = "th1520-reset", + .of_match_table = th1520_reset_dt_ids, + }, +}; +builtin_platform_driver(th1520_reset_driver); -- 2.34.1
next prev parent reply other threads:[~2023-09-18 4:51 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <CGME20230918045133epcas1p42fa41cb80a1250b9db28f398b31d041c@epcas1p4.samsung.com> 2023-09-18 4:51 ` [PATCH v3 0/3] Introduce reset driver for T-HEAD th1520 SoC Kwanghoon Son 2023-09-18 4:51 ` Kwanghoon Son [not found] ` <CGME20230918045134epcas1p1b80b338b66512a976c3783cd0e51da50@epcas1p1.samsung.com> 2023-09-18 4:51 ` [PATCH v3 1/3] dt-bindings: reset: Document th1520 reset control Kwanghoon Son 2023-09-18 4:51 ` Kwanghoon Son 2023-09-18 21:26 ` Conor Dooley 2023-09-18 21:26 ` Conor Dooley 2023-09-19 1:45 ` Kwanghoon Son 2023-09-19 1:45 ` Kwanghoon Son 2023-09-19 5:08 ` Kwanghoon Son 2023-09-19 5:08 ` Kwanghoon Son 2023-09-19 8:47 ` Conor Dooley 2023-09-19 8:47 ` Conor Dooley 2023-09-19 9:14 ` Guo Ren 2023-09-19 9:14 ` Guo Ren 2023-11-29 16:42 ` Xi Ruoyao 2023-11-29 16:42 ` Xi Ruoyao 2023-11-30 15:37 ` Conor Dooley 2023-11-30 15:37 ` Conor Dooley 2023-09-18 21:33 ` Rob Herring 2023-09-18 21:33 ` Rob Herring [not found] ` <CGME20230918045134epcas1p41321973f5fc3aae29e8d27c6b8f35ec2@epcas1p4.samsung.com> 2023-09-18 4:51 ` Kwanghoon Son [this message] 2023-09-18 4:51 ` [PATCH v3 2/3] reset: Add th1520 reset driver support Kwanghoon Son [not found] ` <CGME20230918045134epcas1p3263e6d4124a0d37faadb3cb97bf7cd0b@epcas1p3.samsung.com> 2023-09-18 4:51 ` [PATCH v3 3/3] riscv: dts: Add th1520 reset device tree Kwanghoon Son 2023-09-18 4:51 ` Kwanghoon Son
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