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Fri, 10 Aug 2018 02:53:36 -0700 (PDT) Received: from localhost.localdomain ([2409:4072:6391:e983:9562:f5f7:1a60:4363]) by smtp.gmail.com with ESMTPSA id n83-v6sm25315120pfk.19.2018.08.10.02.53.24 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 10 Aug 2018 02:53:36 -0700 (PDT) From: Manivannan Sadhasivam To: p.zabel@pengutronix.de, mturquette@baylibre.com, sboyd@kernel.org, afaerber@suse.de, robh+dt@kernel.org Subject: [PATCH v3 7/9] clk: actions: Add Actions Semi Owl SoCs Reset Management Unit support Date: Fri, 10 Aug 2018 15:21:11 +0530 Message-Id: <20180810095113.25292-8-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180810095113.25292-1-manivannan.sadhasivam@linaro.org> References: <20180810095113.25292-1-manivannan.sadhasivam@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180810_025348_003508_1507C168 X-CRM114-Status: GOOD ( 16.46 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, daniel.thompson@linaro.org, manivannanece23@gmail.com, sravanhome@gmail.com, jeff.chen@actions-semi.com, thomas.liau@actions-semi.com, bdong@ucrobotics.com, liuwei@actions-semi.com, linux-kernel@vger.kernel.org, amit.kucheria@linaro.org, edgar.righi@lsitec.org.br, hzhang@ucrobotics.com, mp-cs@actions-semi.com, 96boards@ucrobotics.com, pn@denx.de, Manivannan Sadhasivam , linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Add Reset Management Unit (RMU) support for Actions Semi Owl SoCs. Signed-off-by: Manivannan Sadhasivam --- drivers/clk/actions/Kconfig | 1 + drivers/clk/actions/Makefile | 1 + drivers/clk/actions/owl-common.h | 2 + drivers/clk/actions/owl-reset.c | 66 ++++++++++++++++++++++++++++++++ drivers/clk/actions/owl-reset.h | 31 +++++++++++++++ 5 files changed, 101 insertions(+) create mode 100644 drivers/clk/actions/owl-reset.c create mode 100644 drivers/clk/actions/owl-reset.h diff --git a/drivers/clk/actions/Kconfig b/drivers/clk/actions/Kconfig index dc38c85a4833..04f0a6355726 100644 --- a/drivers/clk/actions/Kconfig +++ b/drivers/clk/actions/Kconfig @@ -2,6 +2,7 @@ config CLK_ACTIONS bool "Clock driver for Actions Semi SoCs" depends on ARCH_ACTIONS || COMPILE_TEST select REGMAP_MMIO + select RESET_CONTROLLER default ARCH_ACTIONS if CLK_ACTIONS diff --git a/drivers/clk/actions/Makefile b/drivers/clk/actions/Makefile index 78c17d56f991..ccfdf9781cef 100644 --- a/drivers/clk/actions/Makefile +++ b/drivers/clk/actions/Makefile @@ -7,6 +7,7 @@ clk-owl-y += owl-divider.o clk-owl-y += owl-factor.o clk-owl-y += owl-composite.o clk-owl-y += owl-pll.o +clk-owl-y += owl-reset.o # SoC support obj-$(CONFIG_CLK_OWL_S700) += owl-s700.o diff --git a/drivers/clk/actions/owl-common.h b/drivers/clk/actions/owl-common.h index 56f01f7774aa..5a866a8b913d 100644 --- a/drivers/clk/actions/owl-common.h +++ b/drivers/clk/actions/owl-common.h @@ -26,6 +26,8 @@ struct owl_clk_desc { struct owl_clk_common **clks; unsigned long num_clks; struct clk_hw_onecell_data *hw_clks; + const struct owl_reset_map *resets; + unsigned long num_resets; struct regmap *regmap; }; diff --git a/drivers/clk/actions/owl-reset.c b/drivers/clk/actions/owl-reset.c new file mode 100644 index 000000000000..203f8f34a8d4 --- /dev/null +++ b/drivers/clk/actions/owl-reset.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +// +// Actions Semi Owl SoCs Reset Management Unit driver +// +// Copyright (c) 2018 Linaro Ltd. +// Author: Manivannan Sadhasivam + +#include +#include +#include + +#include "owl-reset.h" + +static int owl_reset_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct owl_reset *reset = to_owl_reset(rcdev); + const struct owl_reset_map *map = &reset->reset_map[id]; + + return regmap_update_bits(reset->regmap, map->reg, map->bit, 0); +} + +static int owl_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct owl_reset *reset = to_owl_reset(rcdev); + const struct owl_reset_map *map = &reset->reset_map[id]; + + return regmap_update_bits(reset->regmap, map->reg, map->bit, map->bit); +} + +static int owl_reset_reset(struct reset_controller_dev *rcdev, + unsigned long id) +{ + owl_reset_assert(rcdev, id); + udelay(1); + owl_reset_deassert(rcdev, id); + + return 0; +} + +static int owl_reset_status(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct owl_reset *reset = to_owl_reset(rcdev); + const struct owl_reset_map *map = &reset->reset_map[id]; + u32 reg; + int ret; + + ret = regmap_read(reset->regmap, map->reg, ®); + if (ret) + return ret; + + /* + * The reset control API expects 0 if reset is not asserted, + * which is the opposite of what our hardware uses. + */ + return !(map->bit & reg); +} + +const struct reset_control_ops owl_reset_ops = { + .assert = owl_reset_assert, + .deassert = owl_reset_deassert, + .reset = owl_reset_reset, + .status = owl_reset_status, +}; diff --git a/drivers/clk/actions/owl-reset.h b/drivers/clk/actions/owl-reset.h new file mode 100644 index 000000000000..10f5774979a6 --- /dev/null +++ b/drivers/clk/actions/owl-reset.h @@ -0,0 +1,31 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +// +// Actions Semi Owl SoCs Reset Management Unit driver +// +// Copyright (c) 2018 Linaro Ltd. +// Author: Manivannan Sadhasivam + +#ifndef _OWL_RESET_H_ +#define _OWL_RESET_H_ + +#include + +struct owl_reset_map { + u32 reg; + u32 bit; +}; + +struct owl_reset { + struct reset_controller_dev rcdev; + const struct owl_reset_map *reset_map; + struct regmap *regmap; +}; + +static inline struct owl_reset *to_owl_reset(struct reset_controller_dev *rcdev) +{ + return container_of(rcdev, struct owl_reset, rcdev); +} + +extern const struct reset_control_ops owl_reset_ops; + +#endif /* _OWL_RESET_H_ */