diff options
Diffstat (limited to 'drivers/reset/reset-stm32.c')
| -rw-r--r-- | drivers/reset/reset-stm32.c | 214 |
1 files changed, 0 insertions, 214 deletions
diff --git a/drivers/reset/reset-stm32.c b/drivers/reset/reset-stm32.c deleted file mode 100644 index 2ef00859c4..0000000000 --- a/drivers/reset/reset-stm32.c +++ /dev/null @@ -1,214 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * Copyright (C) 2017, STMicroelectronics - All Rights Reserved - * Copyright (C) 2019, Ahmad Fatoum, Pengutronix - * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics. - */ - -#include <common.h> -#include <init.h> -#include <linux/err.h> -#include <linux/reset-controller.h> -#include <restart.h> -#include <reset_source.h> -#include <asm/io.h> - -#define RCC_CL 0x4 - -#define RCC_MP_GRSTCSETR 0x404 -#define RCC_MP_RSTSCLRR 0x408 - -#define STM32MP_RCC_RSTF_POR BIT(0) -#define STM32MP_RCC_RSTF_BOR BIT(1) -#define STM32MP_RCC_RSTF_PAD BIT(2) -#define STM32MP_RCC_RSTF_HCSS BIT(3) -#define STM32MP_RCC_RSTF_VCORE BIT(4) - -#define STM32MP_RCC_RSTF_MPSYS BIT(6) -#define STM32MP_RCC_RSTF_MCSYS BIT(7) -#define STM32MP_RCC_RSTF_IWDG1 BIT(8) -#define STM32MP_RCC_RSTF_IWDG2 BIT(9) - -#define STM32MP_RCC_RSTF_STDBY BIT(11) -#define STM32MP_RCC_RSTF_CSTDBY BIT(12) -#define STM32MP_RCC_RSTF_MPUP0 BIT(13) -#define STM32MP_RCC_RSTF_MPUP1 BIT(14) - -struct stm32_reset_reason { - uint32_t mask; - enum reset_src_type type; - int instance; -}; - -struct stm32_reset { - void __iomem *base; - struct reset_controller_dev rcdev; - struct restart_handler restart; - const struct stm32_reset_ops *ops; -}; - -struct stm32_reset_ops { - void (*reset)(void __iomem *reg, unsigned offset, bool assert); - void __noreturn (*sys_reset)(struct restart_handler *rst); - const struct stm32_reset_reason *reset_reasons; -}; - -static struct stm32_reset *to_stm32_reset(struct reset_controller_dev *rcdev) -{ - return container_of(rcdev, struct stm32_reset, rcdev); -} - -static void stm32mp_reset(void __iomem *reg, unsigned offset, bool assert) -{ - if (!assert) - reg += RCC_CL; - - writel(BIT(offset), reg); -} - -static void stm32mcu_reset(void __iomem *reg, unsigned offset, bool assert) -{ - if (assert) - setbits_le32(reg, BIT(offset)); - else - clrbits_le32(reg, BIT(offset)); -} - -static u32 stm32_reset_status(struct stm32_reset *priv, unsigned long bank) -{ - return readl(priv->base + bank); -} - -static void stm32_reset(struct stm32_reset *priv, unsigned long id, bool assert) -{ - int bank = (id / 32) * 4; - int offset = id % 32; - - priv->ops->reset(priv->base + bank, offset, assert); -} - -static void stm32_set_reset_reason(struct stm32_reset *priv, - const struct stm32_reset_reason *reasons) -{ - enum reset_src_type type = RESET_UKWN; - u32 reg; - int i, instance = 0; - - reg = stm32_reset_status(priv, RCC_MP_RSTSCLRR); - - for (i = 0; reasons[i].mask; i++) { - if (reg & reasons[i].mask) { - type = reasons[i].type; - instance = reasons[i].instance; - break; - } - } - - reset_source_set_prinst(type, RESET_SOURCE_DEFAULT_PRIORITY, instance); - - pr_info("STM32 RCC reset reason %s (MP_RSTSR: 0x%08x)\n", - reset_source_to_string(type), reg); -} - -static int stm32_reset_assert(struct reset_controller_dev *rcdev, - unsigned long id) -{ - stm32_reset(to_stm32_reset(rcdev), id, true); - return 0; -} - -static int stm32_reset_deassert(struct reset_controller_dev *rcdev, - unsigned long id) -{ - stm32_reset(to_stm32_reset(rcdev), id, false); - return 0; -} - -static const struct reset_control_ops stm32_reset_ops = { - .assert = stm32_reset_assert, - .deassert = stm32_reset_deassert, -}; - -static int stm32_reset_probe(struct device_d *dev) -{ - struct stm32_reset *priv; - struct resource *iores; - int ret; - - priv = xzalloc(sizeof(*priv)); - ret = dev_get_drvdata(dev, (const void **)&priv->ops); - if (ret) - return ret; - - iores = dev_request_mem_resource(dev, 0); - if (IS_ERR(iores)) - return PTR_ERR(iores); - - priv->base = IOMEM(iores->start); - priv->rcdev.nr_resets = (iores->end - iores->start) * BITS_PER_BYTE; - priv->rcdev.ops = &stm32_reset_ops; - priv->rcdev.of_node = dev->device_node; - - if (priv->ops->sys_reset) { - priv->restart.name = "stm32-rcc"; - priv->restart.restart = priv->ops->sys_reset; - priv->restart.priority = 200; - - ret = restart_handler_register(&priv->restart); - if (ret) - dev_warn(dev, "Cannot register restart handler\n"); - } - - if (priv->ops->reset_reasons) - stm32_set_reset_reason(priv, priv->ops->reset_reasons); - - return reset_controller_register(&priv->rcdev); -} - -static void __noreturn stm32mp_rcc_restart_handler(struct restart_handler *rst) -{ - struct stm32_reset *priv = container_of(rst, struct stm32_reset, restart); - - stm32_reset(priv, RCC_MP_GRSTCSETR * BITS_PER_BYTE, true); - - mdelay(1000); - hang(); -} - -static const struct stm32_reset_reason stm32mp_reset_reasons[] = { - { STM32MP_RCC_RSTF_POR, RESET_POR, 0 }, - { STM32MP_RCC_RSTF_BOR, RESET_BROWNOUT, 0 }, - { STM32MP_RCC_RSTF_STDBY, RESET_WKE, 0 }, - { STM32MP_RCC_RSTF_CSTDBY, RESET_WKE, 1 }, - { STM32MP_RCC_RSTF_MPSYS, RESET_RST, 2 }, - { STM32MP_RCC_RSTF_MPUP0, RESET_RST, 0 }, - { STM32MP_RCC_RSTF_MPUP1, RESET_RST, 1 }, - { STM32MP_RCC_RSTF_IWDG1, RESET_WDG, 0 }, - { STM32MP_RCC_RSTF_IWDG2, RESET_WDG, 1 }, - { STM32MP_RCC_RSTF_PAD, RESET_EXT, 1 }, - { /* sentinel */ } -}; - -static const struct stm32_reset_ops stm32mp1_reset_ops = { - .reset = stm32mp_reset, - .sys_reset = stm32mp_rcc_restart_handler, - .reset_reasons = stm32mp_reset_reasons, -}; - -static const struct stm32_reset_ops stm32mcu_reset_ops = { - .reset = stm32mcu_reset, -}; - -static const struct of_device_id stm32_rcc_reset_dt_ids[] = { - { .compatible = "st,stm32mp1-rcc", .data = &stm32mp1_reset_ops }, - { .compatible = "st,stm32-rcc", .data = &stm32mcu_reset_ops }, - { /* sentinel */ }, -}; - -static struct driver_d stm32_rcc_reset_driver = { - .name = "stm32_rcc_reset", - .probe = stm32_reset_probe, - .of_compatible = DRV_OF_COMPAT(stm32_rcc_reset_dt_ids), -}; - -postcore_platform_driver(stm32_rcc_reset_driver); |