From 017b5522d5e31a0b2c2f54f566aa8887838bccc7 Mon Sep 17 00:00:00 2001 From: Alexandre Belloni Date: Tue, 8 Jul 2014 18:21:11 +0200 Subject: ARM: at91: Add new binding for sama5d3-ddramc The IP for the SDRAM controller found on sama5d3 SoCs is different from the g45 one. Introduce a new compatible string to reflect that. Signed-off-by: Alexandre Belloni Signed-off-by: Maxime Ripard Acked-by: Nicolas Ferre --- Documentation/devicetree/bindings/arm/atmel-at91.txt | 1 + arch/arm/mach-at91/setup.c | 1 + 2 files changed, 2 insertions(+) diff --git a/Documentation/devicetree/bindings/arm/atmel-at91.txt b/Documentation/devicetree/bindings/arm/atmel-at91.txt index 16f60b41c147..33bcf8b57798 100644 --- a/Documentation/devicetree/bindings/arm/atmel-at91.txt +++ b/Documentation/devicetree/bindings/arm/atmel-at91.txt @@ -61,6 +61,7 @@ RAMC SDRAM/DDR Controller required properties: - compatible: Should be "atmel,at91rm9200-sdramc", "atmel,at91sam9260-sdramc", "atmel,at91sam9g45-ddramc", + "atmel,sama5d3-ddramc", - reg: Should contain registers location and length For at91sam9263 and at91sam9g45 you must specify 2 entries. diff --git a/arch/arm/mach-at91/setup.c b/arch/arm/mach-at91/setup.c index f7a07a58ebb6..faff1eae3e65 100644 --- a/arch/arm/mach-at91/setup.c +++ b/arch/arm/mach-at91/setup.c @@ -384,6 +384,7 @@ static struct of_device_id ramc_ids[] = { { .compatible = "atmel,at91rm9200-sdramc", .data = at91rm9200_standby }, { .compatible = "atmel,at91sam9260-sdramc", .data = at91sam9_sdram_standby }, { .compatible = "atmel,at91sam9g45-ddramc", .data = at91_ddr_standby }, + { .compatible = "atmel,sama5d3-ddramc", .data = at91_ddr_standby }, { /*sentinel*/ } }; -- cgit v1.2.1 From e81b6abebc87ec40a434ada4ca8d1f2aa16cea9d Mon Sep 17 00:00:00 2001 From: Alexandre Belloni Date: Tue, 8 Jul 2014 18:21:12 +0200 Subject: memory: add a driver for atmel ram controllers Atmel SoCs have one or multiple RAM controllers that need one or multiple clocks to run. This driver handle those clocks. Signed-off-by: Alexandre Belloni Signed-off-by: Maxime Ripard Acked-by: Nicolas Ferre --- drivers/memory/Kconfig | 10 +++++ drivers/memory/Makefile | 1 + drivers/memory/atmel-sdramc.c | 98 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 109 insertions(+) create mode 100644 drivers/memory/atmel-sdramc.c diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig index c59e9c96e86d..257061c3c816 100644 --- a/drivers/memory/Kconfig +++ b/drivers/memory/Kconfig @@ -7,6 +7,16 @@ menuconfig MEMORY if MEMORY +config ATMEL_SDRAMC + bool "Atmel (Multi-port DDR-)SDRAM Controller" + default y + depends on ARCH_AT91 && OF + help + This driver is for Atmel SDRAM Controller or Atmel Multi-port + DDR-SDRAM Controller available on Atmel AT91SAM9 and SAMA5 SoCs. + Starting with the at91sam9g45, this controller supports SDR, DDR and + LP-DDR memories. + config TI_AEMIF tristate "Texas Instruments AEMIF driver" depends on (ARCH_DAVINCI || ARCH_KEYSTONE) && OF diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile index 71160a2b7313..b8637261e1a1 100644 --- a/drivers/memory/Makefile +++ b/drivers/memory/Makefile @@ -5,6 +5,7 @@ ifeq ($(CONFIG_DDR),y) obj-$(CONFIG_OF) += of_memory.o endif +obj-$(CONFIG_ATMEL_SDRAMC) += atmel-sdramc.o obj-$(CONFIG_TI_AEMIF) += ti-aemif.o obj-$(CONFIG_TI_EMIF) += emif.o obj-$(CONFIG_FSL_IFC) += fsl_ifc.o diff --git a/drivers/memory/atmel-sdramc.c b/drivers/memory/atmel-sdramc.c new file mode 100644 index 000000000000..fed04e8efe75 --- /dev/null +++ b/drivers/memory/atmel-sdramc.c @@ -0,0 +1,98 @@ +/* + * Atmel (Multi-port DDR-)SDRAM Controller driver + * + * Copyright (C) 2014 Atmel + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation version 2 of the License. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + * + */ + +#include +#include +#include +#include +#include +#include + +struct at91_ramc_caps { + bool has_ddrck; + bool has_mpddr_clk; +}; + +static const struct at91_ramc_caps at91rm9200_caps = { }; + +static const struct at91_ramc_caps at91sam9g45_caps = { + .has_ddrck = 1, + .has_mpddr_clk = 0, +}; + +static const struct at91_ramc_caps sama5d3_caps = { + .has_ddrck = 1, + .has_mpddr_clk = 1, +}; + +static const struct of_device_id atmel_ramc_of_match[] = { + { .compatible = "atmel,at91rm9200-sdramc", .data = &at91rm9200_caps, }, + { .compatible = "atmel,at91sam9260-sdramc", .data = &at91rm9200_caps, }, + { .compatible = "atmel,at91sam9g45-ddramc", .data = &at91sam9g45_caps, }, + { .compatible = "atmel,sama5d3-ddramc", .data = &sama5d3_caps, }, + {}, +}; +MODULE_DEVICE_TABLE(of, atmel_ramc_of_match); + +static int atmel_ramc_probe(struct platform_device *pdev) +{ + const struct of_device_id *match; + const struct at91_ramc_caps *caps; + struct clk *clk; + + match = of_match_device(atmel_ramc_of_match, &pdev->dev); + caps = match->data; + + if (caps->has_ddrck) { + clk = devm_clk_get(&pdev->dev, "ddrck"); + if (IS_ERR(clk)) + return PTR_ERR(clk); + clk_prepare_enable(clk); + } + + if (caps->has_mpddr_clk) { + clk = devm_clk_get(&pdev->dev, "mpddr"); + if (IS_ERR(clk)) { + pr_err("AT91 RAMC: couldn't get mpddr clock\n"); + return PTR_ERR(clk); + } + clk_prepare_enable(clk); + } + + return 0; +} + +static struct platform_driver atmel_ramc_driver = { + .probe = atmel_ramc_probe, + .driver = { + .name = "atmel-ramc", + .owner = THIS_MODULE, + .of_match_table = atmel_ramc_of_match, + }, +}; + +static int __init atmel_ramc_init(void) +{ + return platform_driver_register(&atmel_ramc_driver); +} +module_init(atmel_ramc_init); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Alexandre Belloni "); +MODULE_DESCRIPTION("Atmel (Multi-port DDR-)SDRAM Controller"); -- cgit v1.2.1 From 63e60368956ea076278dd3d70dc80b366e0ec6f3 Mon Sep 17 00:00:00 2001 From: Alexandre Belloni Date: Tue, 8 Jul 2014 18:21:13 +0200 Subject: ARM: at91: select ATMEL_SDRAMC when using OF When using device tree, select the Atmel RAM controller driver to handle its clocks. Signed-off-by: Alexandre Belloni Signed-off-by: Maxime Ripard Acked-by: Nicolas Ferre --- arch/arm/mach-at91/Kconfig | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig index 45b55e0f0db6..7a69ffd93b6b 100644 --- a/arch/arm/mach-at91/Kconfig +++ b/arch/arm/mach-at91/Kconfig @@ -49,6 +49,8 @@ config SOC_AT91SAM9 select GENERIC_CLOCKEVENTS select MULTI_IRQ_HANDLER select SPARSE_IRQ + select MEMORY if USE_OF + select ATMEL_SDRAMC if USE_OF config SOC_SAMA5 bool @@ -58,6 +60,8 @@ config SOC_SAMA5 select MULTI_IRQ_HANDLER select SPARSE_IRQ select USE_OF + select MEMORY + select ATMEL_SDRAMC menu "Atmel AT91 System-on-Chip" -- cgit v1.2.1 From b736bcb3d8fe6182d12feb0412106802d80b4527 Mon Sep 17 00:00:00 2001 From: Alexandre Belloni Date: Tue, 8 Jul 2014 18:21:16 +0200 Subject: clk: at91: remove the useless CLK_IGNORE_UNUSED flag The CLK_IGNORE_UNUSED flag was added on all the system clocks because of the ddrck. Now that it is handled by the ram controller driver, we can drop it. Signed-off-by: Alexandre Belloni Signed-off-by: Maxime Ripard Acked-by: Nicolas Ferre --- drivers/clk/at91/clk-system.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/drivers/clk/at91/clk-system.c b/drivers/clk/at91/clk-system.c index 8c96307d7363..a76d03fd577b 100644 --- a/drivers/clk/at91/clk-system.c +++ b/drivers/clk/at91/clk-system.c @@ -119,13 +119,7 @@ at91_clk_register_system(struct at91_pmc *pmc, const char *name, init.ops = &system_ops; init.parent_names = &parent_name; init.num_parents = 1; - /* - * CLK_IGNORE_UNUSED is used to avoid ddrck switch off. - * TODO : we should implement a driver supporting at91 ddr controller - * (see drivers/memory) which would request and enable the ddrck clock. - * When this is done we will be able to remove CLK_IGNORE_UNUSED flag. - */ - init.flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED; + init.flags = CLK_SET_RATE_PARENT; sys->id = id; sys->hw.init = &init; -- cgit v1.2.1 From 6ca4f46005dd7934308588d8e4d73637bbaef7ad Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Tue, 1 Jul 2014 16:58:40 +0200 Subject: power: reset: Add if statement instead of multiple depends on All the config option so far are depending on the POWER_RESET symbol Signed-off-by: Maxime Ripard Acked-by: Nicolas Ferre Acked-by: Alexandre Belloni --- drivers/power/reset/Kconfig | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index bdcf5173e377..19d546c5edfa 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -6,15 +6,17 @@ menuconfig POWER_RESET Say Y here to enable board reset and power off +if POWER_RESET + config POWER_RESET_AS3722 bool "ams AS3722 power-off driver" - depends on MFD_AS3722 && POWER_RESET + depends on MFD_AS3722 help This driver supports turning off board via a ams AS3722 power-off. config POWER_RESET_AXXIA bool "LSI Axxia reset driver" - depends on POWER_RESET && ARCH_AXXIA + depends on ARCH_AXXIA help This driver supports restart for Axxia SoC. @@ -22,7 +24,7 @@ config POWER_RESET_AXXIA config POWER_RESET_GPIO bool "GPIO power-off driver" - depends on OF_GPIO && POWER_RESET + depends on OF_GPIO help This driver supports turning off your board via a GPIO line. If your board needs a GPIO high/low to power down, say Y and @@ -30,13 +32,13 @@ config POWER_RESET_GPIO config POWER_RESET_MSM bool "Qualcomm MSM power-off driver" - depends on POWER_RESET && ARCH_QCOM + depends on ARCH_QCOM help Power off and restart support for Qualcomm boards. config POWER_RESET_QNAP bool "QNAP power-off driver" - depends on OF_GPIO && POWER_RESET && PLAT_ORION + depends on OF_GPIO && PLAT_ORION help This driver supports turning off QNAP NAS devices by sending commands to the microcontroller which controls the main power. @@ -54,14 +56,13 @@ config POWER_RESET_RESTART config POWER_RESET_SUN6I bool "Allwinner A31 SoC reset driver" depends on ARCH_SUNXI - depends on POWER_RESET help Reboot support for the Allwinner A31 SoCs. config POWER_RESET_VEXPRESS bool "ARM Versatile Express power-off and reset driver" depends on ARM || ARM64 - depends on POWER_RESET && VEXPRESS_CONFIG + depends on VEXPRESS_CONFIG help Power off and reset support for the ARM Ltd. Versatile Express boards. @@ -69,7 +70,6 @@ config POWER_RESET_VEXPRESS config POWER_RESET_XGENE bool "APM SoC X-Gene reset driver" depends on ARM64 - depends on POWER_RESET help Reboot support for the APM SoC X-Gene Eval boards. @@ -80,3 +80,4 @@ config POWER_RESET_KEYSTONE help Reboot support for the KEYSTONE SoCs. +endif -- cgit v1.2.1 From ecfe64d8c55f8f210a609cd2eabfcc03f03672a9 Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Wed, 2 Jul 2014 17:46:58 +0200 Subject: power: reset: Add AT91 reset driver Implement the reset behaviour of the various AT91 SoCS in drivers/power/reset. It used to be (and still is) located in arch/arm/mach-at91, and in order to preserve bisectability is not removed yet, but every board should be converted to use this driver instead. Signed-off-by: Maxime Ripard Acked-by: Nicolas Ferre Acked-by: Alexandre Belloni --- drivers/power/reset/Kconfig | 8 ++ drivers/power/reset/Makefile | 1 + drivers/power/reset/at91-reset.c | 252 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 261 insertions(+) create mode 100644 drivers/power/reset/at91-reset.c diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index 19d546c5edfa..360bac75a3da 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -14,6 +14,14 @@ config POWER_RESET_AS3722 help This driver supports turning off board via a ams AS3722 power-off. +config POWER_RESET_AT91_RESET + bool "Atmel AT91 reset driver" + depends on MACH_AT91 + default SOC_AT91SAM9 || SOC_SAMA5 + help + This driver supports restart for Atmel AT91SAM9 and SAMA5 + SoCs + config POWER_RESET_AXXIA bool "LSI Axxia reset driver" depends on ARCH_AXXIA diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index dde2e8bbac53..1599214b91d9 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -1,4 +1,5 @@ obj-$(CONFIG_POWER_RESET_AS3722) += as3722-poweroff.o +obj-$(CONFIG_POWER_RESET_AT91_RESET) += at91-reset.o obj-$(CONFIG_POWER_RESET_AXXIA) += axxia-reset.o obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o diff --git a/drivers/power/reset/at91-reset.c b/drivers/power/reset/at91-reset.c new file mode 100644 index 000000000000..3611806c9cfd --- /dev/null +++ b/drivers/power/reset/at91-reset.c @@ -0,0 +1,252 @@ +/* + * Atmel AT91 SAM9 SoCs reset code + * + * Copyright (C) 2007 Atmel Corporation. + * Copyright (C) BitBox Ltd 2010 + * Copyright (C) 2011 Jean-Christophe PLAGNIOL-VILLARD + * Copyright (C) 2014 Free Electrons + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include +#include +#include +#include +#include + +#include + +#include +#include + +#define AT91_RSTC_CR 0x00 /* Reset Controller Control Register */ +#define AT91_RSTC_PROCRST BIT(0) /* Processor Reset */ +#define AT91_RSTC_PERRST BIT(2) /* Peripheral Reset */ +#define AT91_RSTC_EXTRST BIT(3) /* External Reset */ +#define AT91_RSTC_KEY (0xa5 << 24) /* KEY Password */ + +#define AT91_RSTC_SR 0x04 /* Reset Controller Status Register */ +#define AT91_RSTC_URSTS BIT(0) /* User Reset Status */ +#define AT91_RSTC_RSTTYP GENMASK(10, 8) /* Reset Type */ +#define AT91_RSTC_NRSTL BIT(16) /* NRST Pin Level */ +#define AT91_RSTC_SRCMP BIT(17) /* Software Reset Command in Progress */ + +#define AT91_RSTC_MR 0x08 /* Reset Controller Mode Register */ +#define AT91_RSTC_URSTEN BIT(0) /* User Reset Enable */ +#define AT91_RSTC_URSTIEN BIT(4) /* User Reset Interrupt Enable */ +#define AT91_RSTC_ERSTL GENMASK(11, 8) /* External Reset Length */ + +enum reset_type { + RESET_TYPE_GENERAL = 0, + RESET_TYPE_WAKEUP = 1, + RESET_TYPE_WATCHDOG = 2, + RESET_TYPE_SOFTWARE = 3, + RESET_TYPE_USER = 4, +}; + +static void __iomem *at91_ramc_base[2], *at91_rstc_base; + +/* +* unless the SDRAM is cleanly shutdown before we hit the +* reset register it can be left driving the data bus and +* killing the chance of a subsequent boot from NAND +*/ +static void at91sam9260_restart(enum reboot_mode mode, const char *cmd) +{ + asm volatile( + /* Align to cache lines */ + ".balign 32\n\t" + + /* Disable SDRAM accesses */ + "str %2, [%0, #" __stringify(AT91_SDRAMC_TR) "]\n\t" + + /* Power down SDRAM */ + "str %3, [%0, #" __stringify(AT91_SDRAMC_LPR) "]\n\t" + + /* Reset CPU */ + "str %4, [%1, #" __stringify(AT91_RSTC_CR) "]\n\t" + + "b .\n\t" + : + : "r" (at91_ramc_base[0]), + "r" (at91_rstc_base), + "r" (1), + "r" (AT91_SDRAMC_LPCB_POWER_DOWN), + "r" (AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST)); +} + +static void at91sam9g45_restart(enum reboot_mode mode, const char *cmd) +{ + asm volatile( + /* + * Test wether we have a second RAM controller to care + * about. + * + * First, test that we can dereference the virtual address. + */ + "cmp %1, #0\n\t" + "beq 1f\n\t" + + /* Then, test that the RAM controller is enabled */ + "ldr r0, [%1]\n\t" + "cmp r0, #0\n\t" + + /* Align to cache lines */ + ".balign 32\n\t" + + /* Disable SDRAM0 accesses */ + "1: str %3, [%0, #" __stringify(AT91_DDRSDRC_RTR) "]\n\t" + /* Power down SDRAM0 */ + " str %4, [%0, #" __stringify(AT91_DDRSDRC_RTR) "]\n\t" + /* Disable SDRAM1 accesses */ + " strne %3, [%1, #" __stringify(AT91_DDRSDRC_RTR) "]\n\t" + /* Power down SDRAM1 */ + " strne %4, [%1, #" __stringify(AT91_DDRSDRC_RTR) "]\n\t" + /* Reset CPU */ + " str %5, [%2, #" __stringify(AT91_RSTC_CR) "]\n\t" + + " b .\n\t" + : + : "r" (at91_ramc_base[0]), + "r" (at91_ramc_base[1]), + "r" (at91_rstc_base), + "r" (1), + "r" (AT91_DDRSDRC_LPCB_POWER_DOWN), + "r" (AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST) + : "r0"); +} + +static void __init at91_reset_status(struct platform_device *pdev) +{ + u32 reg = readl(at91_rstc_base + AT91_RSTC_SR); + char *reason; + + switch ((reg & AT91_RSTC_RSTTYP) >> 8) { + case RESET_TYPE_GENERAL: + reason = "general reset"; + break; + case RESET_TYPE_WAKEUP: + reason = "wakeup"; + break; + case RESET_TYPE_WATCHDOG: + reason = "watchdog reset"; + break; + case RESET_TYPE_SOFTWARE: + reason = "software reset"; + break; + case RESET_TYPE_USER: + reason = "user reset"; + break; + default: + reason = "unknown reset"; + break; + } + + pr_info("AT91: Starting after %s\n", reason); +} + +static struct of_device_id at91_ramc_of_match[] = { + { .compatible = "atmel,at91sam9260-sdramc", }, + { .compatible = "atmel,at91sam9g45-ddramc", }, + { .compatible = "atmel,sama5d3-ddramc", }, + { /* sentinel */ } +}; + +static struct of_device_id at91_reset_of_match[] = { + { .compatible = "atmel,at91sam9260-rstc", .data = at91sam9260_restart }, + { .compatible = "atmel,at91sam9g45-rstc", .data = at91sam9g45_restart }, + { /* sentinel */ } +}; + +static int at91_reset_of_probe(struct platform_device *pdev) +{ + const struct of_device_id *match; + struct device_node *np; + int idx = 0; + + at91_rstc_base = of_iomap(pdev->dev.of_node, 0); + if (!at91_rstc_base) { + dev_err(&pdev->dev, "Could not map reset controller address\n"); + return -ENODEV; + } + + for_each_matching_node(np, at91_ramc_of_match) { + at91_ramc_base[idx] = of_iomap(np, 0); + if (!at91_ramc_base[idx]) { + dev_err(&pdev->dev, "Could not map ram controller address\n"); + return -ENODEV; + } + idx++; + } + + match = of_match_node(at91_reset_of_match, pdev->dev.of_node); + arm_pm_restart = match->data; + + return 0; +} + +static int at91_reset_platform_probe(struct platform_device *pdev) +{ + const struct platform_device_id *match; + struct resource *res; + int idx = 0; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + at91_rstc_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(at91_rstc_base)) { + dev_err(&pdev->dev, "Could not map reset controller address\n"); + return PTR_ERR(at91_rstc_base); + } + + for (idx = 0; idx < 2; idx++) { + res = platform_get_resource(pdev, IORESOURCE_MEM, idx + 1 ); + at91_ramc_base[idx] = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (IS_ERR(at91_ramc_base[idx])) { + dev_err(&pdev->dev, "Could not map ram controller address\n"); + return PTR_ERR(at91_ramc_base[idx]); + } + } + + match = platform_get_device_id(pdev); + arm_pm_restart = (void (*)(enum reboot_mode, const char*)) + match->driver_data; + + return 0; +} + +static int at91_reset_probe(struct platform_device *pdev) +{ + int ret; + + if (pdev->dev.of_node) + ret = at91_reset_of_probe(pdev); + else + ret = at91_reset_platform_probe(pdev); + + if (ret) + return ret; + + at91_reset_status(pdev); + + return 0; +} + +static struct platform_device_id at91_reset_plat_match[] = { + { "at91-sam9260-reset", (unsigned long)at91sam9260_restart }, + { "at91-sam9g45-reset", (unsigned long)at91sam9g45_restart }, + { /* sentinel */ } +}; + +static struct platform_driver at91_reset_driver = { + .probe = at91_reset_probe, + .driver = { + .name = "at91-reset", + .of_match_table = at91_reset_of_match, + }, + .id_table = at91_reset_plat_match, +}; +module_platform_driver(at91_reset_driver); -- cgit v1.2.1 From ae499f0fadaf28bf3138676fa2d3f6cf7d57556a Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Thu, 3 Jul 2014 14:07:18 +0200 Subject: power: reset: Add AT91 poweroff driver Add a driver to handle the shutdown of the Atmel SoCs. This code used to be (and still is) in arch/arm/mach-at91. We didn't remove it yet so that we can convert all the boards to using this driver, before removing it entirely in a separate patch. Signed-off-by: Maxime Ripard Acked-by: Nicolas Ferre Acked-by: Alexandre Belloni --- drivers/power/reset/Kconfig | 8 ++ drivers/power/reset/Makefile | 1 + drivers/power/reset/at91-poweroff.c | 156 ++++++++++++++++++++++++++++++++++++ 3 files changed, 165 insertions(+) create mode 100644 drivers/power/reset/at91-poweroff.c diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index 360bac75a3da..1f9d0c53fc14 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -14,6 +14,14 @@ config POWER_RESET_AS3722 help This driver supports turning off board via a ams AS3722 power-off. +config POWER_RESET_AT91_POWEROFF + bool "Atmel AT91 poweroff driver" + depends on MACH_AT91 + default SOC_AT91SAM9 || SOC_SAMA5 + help + This driver supports poweroff for Atmel AT91SAM9 and SAMA5 + SoCs + config POWER_RESET_AT91_RESET bool "Atmel AT91 reset driver" depends on MACH_AT91 diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index 1599214b91d9..8bf941bac3da 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -1,4 +1,5 @@ obj-$(CONFIG_POWER_RESET_AS3722) += as3722-poweroff.o +obj-$(CONFIG_POWER_RESET_AT91_POWEROFF) += at91-poweroff.o obj-$(CONFIG_POWER_RESET_AT91_RESET) += at91-reset.o obj-$(CONFIG_POWER_RESET_AXXIA) += axxia-reset.o obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o diff --git a/drivers/power/reset/at91-poweroff.c b/drivers/power/reset/at91-poweroff.c new file mode 100644 index 000000000000..40bf42d146f1 --- /dev/null +++ b/drivers/power/reset/at91-poweroff.c @@ -0,0 +1,156 @@ +/* + * Atmel AT91 SAM9 SoCs reset code + * + * Copyright (C) 2007 Atmel Corporation. + * Copyright (C) 2011 Jean-Christophe PLAGNIOL-VILLARD + * Copyright (C) 2014 Free Electrons + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include +#include +#include +#include +#include + +#define AT91_SHDW_CR 0x00 /* Shut Down Control Register */ +#define AT91_SHDW_SHDW BIT(0) /* Shut Down command */ +#define AT91_SHDW_KEY (0xa5 << 24) /* KEY Password */ + +#define AT91_SHDW_MR 0x04 /* Shut Down Mode Register */ +#define AT91_SHDW_WKMODE0 GENMASK(2, 0) /* Wake-up 0 Mode Selection */ +#define AT91_SHDW_CPTWK0_MAX 0xf /* Maximum Counter On Wake Up 0 */ +#define AT91_SHDW_CPTWK0 (AT91_SHDW_CPTWK0_MAX << 4) /* Counter On Wake Up 0 */ +#define AT91_SHDW_CPTWK0_(x) ((x) << 4) +#define AT91_SHDW_RTTWKEN BIT(16) /* Real Time Timer Wake-up Enable */ +#define AT91_SHDW_RTCWKEN BIT(17) /* Real Time Clock Wake-up Enable */ + +#define AT91_SHDW_SR 0x08 /* Shut Down Status Register */ +#define AT91_SHDW_WAKEUP0 BIT(0) /* Wake-up 0 Status */ +#define AT91_SHDW_RTTWK BIT(16) /* Real-time Timer Wake-up */ +#define AT91_SHDW_RTCWK BIT(17) /* Real-time Clock Wake-up [SAM9RL] */ + +enum wakeup_type { + AT91_SHDW_WKMODE0_NONE = 0, + AT91_SHDW_WKMODE0_HIGH = 1, + AT91_SHDW_WKMODE0_LOW = 2, + AT91_SHDW_WKMODE0_ANYLEVEL = 3, +}; + +static const char *shdwc_wakeup_modes[] = { + [AT91_SHDW_WKMODE0_NONE] = "none", + [AT91_SHDW_WKMODE0_HIGH] = "high", + [AT91_SHDW_WKMODE0_LOW] = "low", + [AT91_SHDW_WKMODE0_ANYLEVEL] = "any", +}; + +static void __iomem *at91_shdwc_base; + +static void __init at91_wakeup_status(void) +{ + u32 reg = readl(at91_shdwc_base); + char *reason = "unknown"; + + /* Simple power-on, just bail out */ + if (!reg) + return; + + if (reg & AT91_SHDW_RTTWK) + reason = "RTT"; + else if (reg & AT91_SHDW_RTCWK) + reason = "RTC"; + + pr_info("AT91: Wake-Up source: %s\n", reason); +} + +static void at91_poweroff(void) +{ + writel(AT91_SHDW_KEY | AT91_SHDW_SHDW, at91_shdwc_base + AT91_SHDW_CR); +} + +const enum wakeup_type at91_poweroff_get_wakeup_mode(struct device_node *np) +{ + const char *pm; + int err, i; + + err = of_property_read_string(np, "atmel,wakeup-mode", &pm); + if (err < 0) + return AT91_SHDW_WKMODE0_ANYLEVEL; + + for (i = 0; i < ARRAY_SIZE(shdwc_wakeup_modes); i++) + if (!strcasecmp(pm, shdwc_wakeup_modes[i])) + return i; + + return -ENODEV; +} + +static void at91_poweroff_dt_set_wakeup_mode(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + enum wakeup_type wakeup_mode; + u32 mode = 0, tmp; + + wakeup_mode = at91_poweroff_get_wakeup_mode(np); + if (wakeup_mode < 0) { + dev_warn(&pdev->dev, "shdwc unknown wakeup mode\n"); + return; + } + + if (!of_property_read_u32(np, "atmel,wakeup-counter", &tmp)) { + if (tmp > AT91_SHDW_CPTWK0_MAX) { + dev_warn(&pdev->dev, + "shdwc wakeup counter 0x%x > 0x%x reduce it to 0x%x\n", + tmp, AT91_SHDW_CPTWK0_MAX, AT91_SHDW_CPTWK0_MAX); + tmp = AT91_SHDW_CPTWK0_MAX; + } + mode |= AT91_SHDW_CPTWK0_(tmp); + } + + if (of_property_read_bool(np, "atmel,wakeup-rtc-timer")) + mode |= AT91_SHDW_RTCWKEN; + + if (of_property_read_bool(np, "atmel,wakeup-rtt-timer")) + mode |= AT91_SHDW_RTTWKEN; + + writel(wakeup_mode | mode, at91_shdwc_base + AT91_SHDW_MR); +} + +static int at91_poweroff_probe(struct platform_device *pdev) +{ + struct resource *res; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + at91_shdwc_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(at91_shdwc_base)) { + dev_err(&pdev->dev, "Could not map reset controller address\n"); + return PTR_ERR(at91_shdwc_base); + } + + at91_wakeup_status(); + + if (pdev->dev.of_node) + at91_poweroff_dt_set_wakeup_mode(pdev); + + pm_power_off = at91_poweroff; + + return 0; +} + +static struct of_device_id at91_poweroff_of_match[] = { + { .compatible = "atmel,at91sam9260-shdwc", }, + { .compatible = "atmel,at91sam9rl-shdwc", }, + { .compatible = "atmel,at91sam9x5-shdwc", }, + { /*sentinel*/ } +}; + +static struct platform_driver at91_poweroff_driver = { + .probe = at91_poweroff_probe, + .driver = { + .name = "at91-poweroff", + .of_match_table = at91_poweroff_of_match, + }, +}; +module_platform_driver(at91_poweroff_driver); -- cgit v1.2.1