This adds support for the MediaTek pericfg controller found on the MT8135/MT8173 SoCs. The pericfg controller contains miscellaneous registers for controlling peripheral resets and clocks.
Signed-off-by: Sascha Hauer <[email protected]> --- .../devicetree/bindings/soc/mediatek/pericfg.txt | 29 +++++ drivers/soc/mediatek/Kconfig | 10 ++ drivers/soc/mediatek/Makefile | 1 + drivers/soc/mediatek/mtk-pericfg.c | 127 +++++++++++++++++++++ 4 files changed, 167 insertions(+) create mode 100644 Documentation/devicetree/bindings/soc/mediatek/pericfg.txt create mode 100644 drivers/soc/mediatek/mtk-pericfg.c diff --git a/Documentation/devicetree/bindings/soc/mediatek/pericfg.txt b/Documentation/devicetree/bindings/soc/mediatek/pericfg.txt new file mode 100644 index 0000000..3996e171 --- /dev/null +++ b/Documentation/devicetree/bindings/soc/mediatek/pericfg.txt @@ -0,0 +1,29 @@ +MediaTek pericfg Controller +=========================== + +The pericfg controller contains miscellaneous registers for controlling +clocks, resets and bus settings. + +Required properties: +- compatible: must be one of: + mediatek,mt8135-pericfg + mediatek,mt8173-pericfg +- reg: Address range for the pericfg controller +- #reset-cells: 1, see below + +Specifying reset lines connected to the pericfg controller +========================================================== + +The infracfg controller provides various reset sources to other modules. +Device nodes using these reset sources should specify the reset lines in +a property containing a phandle to the infracfg node and a reset index. +See include/dt-bindings/reset-controller/<soc>-resets.h for a list of valid +indices. + +Example: + + pericfg: pericfg@10003000 { + #reset-cells = <1>; + compatible = "mediatek,mt8135-pericfg"; + reg = <0 0x10003000 0 0x1000>; + }; diff --git a/drivers/soc/mediatek/Kconfig b/drivers/soc/mediatek/Kconfig index 3ad39fe..9bdb88f 100644 --- a/drivers/soc/mediatek/Kconfig +++ b/drivers/soc/mediatek/Kconfig @@ -10,3 +10,13 @@ config MTK_INFRACFG contains several miscellaneous registers for clock, reset and bus settings. Say yes here if you want to run your kernel on one of these SoCs. + +config MTK_PERICFG + tristate "MediaTek pericfg controller support" + depends on ARCH_MEDIATEK || COMPILE_TEST + select REGMAP + help + The MediaTek pericfg controller found on MT8135 and MT8173 SoCs + contains several miscellaneous registers for clock, reset and bus + settings. Say yes here if you want to run your kernel on one of these + SoCs. diff --git a/drivers/soc/mediatek/Makefile b/drivers/soc/mediatek/Makefile index dbeb627..e67be7c 100644 --- a/drivers/soc/mediatek/Makefile +++ b/drivers/soc/mediatek/Makefile @@ -1 +1,2 @@ obj-$(CONFIG_MTK_INFRACFG) += mtk-infracfg.o +obj-$(CONFIG_MTK_PERICFG) += mtk-pericfg.o diff --git a/drivers/soc/mediatek/mtk-pericfg.c b/drivers/soc/mediatek/mtk-pericfg.c new file mode 100644 index 0000000..aa9a7eb --- /dev/null +++ b/drivers/soc/mediatek/mtk-pericfg.c @@ -0,0 +1,127 @@ +/* + * Copyright (c) 2014 MediaTek Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/reset-controller.h> + +struct mtk_pericfg { + struct regmap *regmap; + struct reset_controller_dev rcdev; +}; + +static int mtk_pericfg_reset_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct mtk_pericfg *data = container_of(rcdev, struct mtk_pericfg, rcdev); + + return regmap_update_bits(data->regmap, (id / 32) << 2, BIT(id % 32), ~0); +} + +static int mtk_pericfg_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct mtk_pericfg *data = container_of(rcdev, struct mtk_pericfg, rcdev); + + return regmap_update_bits(data->regmap, (id / 32) << 2, BIT(id % 32), 0); +} + +static int mtk_pericfg_reset(struct reset_controller_dev *rcdev, + unsigned long id) +{ + int ret; + + ret = mtk_pericfg_reset_assert(rcdev, id); + if (ret) + return ret; + + return mtk_pericfg_reset_deassert(rcdev, id); +} + +static struct reset_control_ops mtk_pericfg_reset_ops = { + .assert = mtk_pericfg_reset_assert, + .deassert = mtk_pericfg_reset_deassert, + .reset = mtk_pericfg_reset, +}; + +static struct regmap_config mtk_pericfg_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, +}; + +static int mtk_pericfg_probe(struct platform_device *pdev) +{ + struct mtk_pericfg *data; + struct resource *res; + void __iomem *base; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + data->regmap = devm_regmap_init_mmio(&pdev->dev, base, + &mtk_pericfg_regmap_config); + if (IS_ERR(data->regmap)) + return PTR_ERR(data->regmap); + + data->rcdev.owner = THIS_MODULE; + data->rcdev.nr_resets = 64; + data->rcdev.ops = &mtk_pericfg_reset_ops; + data->rcdev.of_node = pdev->dev.of_node; + + return reset_controller_register(&data->rcdev); +} + +static int mtk_pericfg_remove(struct platform_device *pdev) +{ + struct mtk_pericfg *data = platform_get_drvdata(pdev); + + reset_controller_unregister(&data->rcdev); + + return 0; +} + +static const struct of_device_id mtk_pericfg_dt_ids[] = { + { + .compatible = "mediatek,mt8173-pericfg", + }, { + .compatible = "mediatek,mt8135-pericfg", + }, { + /* sentinel */ + }, +}; +MODULE_DEVICE_TABLE(of, mtk_pericfg_dt_ids); + +static struct platform_driver mtk_pericfg_driver = { + .probe = mtk_pericfg_probe, + .remove = mtk_pericfg_remove, + .driver = { + .name = "mtk-pericfg", + .of_match_table = mtk_pericfg_dt_ids, + }, +}; + +module_platform_driver(mtk_pericfg_driver); + +MODULE_AUTHOR("Sascha Hauer <[email protected]>"); +MODULE_DESCRIPTION("MediaTek pericfg controller"); +MODULE_LICENSE("GPL"); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
