diff options
Diffstat (limited to 'drivers/power/reset/oxnas-restart.c')
| -rw-r--r-- | drivers/power/reset/oxnas-restart.c | 233 |
1 files changed, 0 insertions, 233 deletions
diff --git a/drivers/power/reset/oxnas-restart.c b/drivers/power/reset/oxnas-restart.c deleted file mode 100644 index 13090bec058a..000000000000 --- a/drivers/power/reset/oxnas-restart.c +++ /dev/null @@ -1,233 +0,0 @@ -// SPDX-License-Identifier: (GPL-2.0) -/* - * oxnas SoC reset driver - * based on: - * Microsemi MIPS SoC reset driver - * and ox820_assert_system_reset() written by Ma Hajun <mahaijuns@gmail.com> - * - * Copyright (c) 2013 Ma Hajun <mahaijuns@gmail.com> - * Copyright (c) 2017 Microsemi Corporation - * Copyright (c) 2020 Daniel Golle <daniel@makrotopia.org> - */ -#include <linux/delay.h> -#include <linux/io.h> -#include <linux/notifier.h> -#include <linux/mfd/syscon.h> -#include <linux/of_address.h> -#include <linux/of_device.h> -#include <linux/platform_device.h> -#include <linux/reboot.h> -#include <linux/regmap.h> - -/* bit numbers of reset control register */ -#define OX820_SYS_CTRL_RST_SCU 0 -#define OX820_SYS_CTRL_RST_COPRO 1 -#define OX820_SYS_CTRL_RST_ARM0 2 -#define OX820_SYS_CTRL_RST_ARM1 3 -#define OX820_SYS_CTRL_RST_USBHS 4 -#define OX820_SYS_CTRL_RST_USBHSPHYA 5 -#define OX820_SYS_CTRL_RST_MACA 6 -#define OX820_SYS_CTRL_RST_MAC OX820_SYS_CTRL_RST_MACA -#define OX820_SYS_CTRL_RST_PCIEA 7 -#define OX820_SYS_CTRL_RST_SGDMA 8 -#define OX820_SYS_CTRL_RST_CIPHER 9 -#define OX820_SYS_CTRL_RST_DDR 10 -#define OX820_SYS_CTRL_RST_SATA 11 -#define OX820_SYS_CTRL_RST_SATA_LINK 12 -#define OX820_SYS_CTRL_RST_SATA_PHY 13 -#define OX820_SYS_CTRL_RST_PCIEPHY 14 -#define OX820_SYS_CTRL_RST_STATIC 15 -#define OX820_SYS_CTRL_RST_GPIO 16 -#define OX820_SYS_CTRL_RST_UART1 17 -#define OX820_SYS_CTRL_RST_UART2 18 -#define OX820_SYS_CTRL_RST_MISC 19 -#define OX820_SYS_CTRL_RST_I2S 20 -#define OX820_SYS_CTRL_RST_SD 21 -#define OX820_SYS_CTRL_RST_MACB 22 -#define OX820_SYS_CTRL_RST_PCIEB 23 -#define OX820_SYS_CTRL_RST_VIDEO 24 -#define OX820_SYS_CTRL_RST_DDR_PHY 25 -#define OX820_SYS_CTRL_RST_USBHSPHYB 26 -#define OX820_SYS_CTRL_RST_USBDEV 27 -#define OX820_SYS_CTRL_RST_ARMDBG 29 -#define OX820_SYS_CTRL_RST_PLLA 30 -#define OX820_SYS_CTRL_RST_PLLB 31 - -/* bit numbers of clock control register */ -#define OX820_SYS_CTRL_CLK_COPRO 0 -#define OX820_SYS_CTRL_CLK_DMA 1 -#define OX820_SYS_CTRL_CLK_CIPHER 2 -#define OX820_SYS_CTRL_CLK_SD 3 -#define OX820_SYS_CTRL_CLK_SATA 4 -#define OX820_SYS_CTRL_CLK_I2S 5 -#define OX820_SYS_CTRL_CLK_USBHS 6 -#define OX820_SYS_CTRL_CLK_MACA 7 -#define OX820_SYS_CTRL_CLK_MAC OX820_SYS_CTRL_CLK_MACA -#define OX820_SYS_CTRL_CLK_PCIEA 8 -#define OX820_SYS_CTRL_CLK_STATIC 9 -#define OX820_SYS_CTRL_CLK_MACB 10 -#define OX820_SYS_CTRL_CLK_PCIEB 11 -#define OX820_SYS_CTRL_CLK_REF600 12 -#define OX820_SYS_CTRL_CLK_USBDEV 13 -#define OX820_SYS_CTRL_CLK_DDR 14 -#define OX820_SYS_CTRL_CLK_DDRPHY 15 -#define OX820_SYS_CTRL_CLK_DDRCK 16 - -/* Regmap offsets */ -#define OX820_CLK_SET_REGOFFSET 0x2c -#define OX820_CLK_CLR_REGOFFSET 0x30 -#define OX820_RST_SET_REGOFFSET 0x34 -#define OX820_RST_CLR_REGOFFSET 0x38 -#define OX820_SECONDARY_SEL_REGOFFSET 0x14 -#define OX820_TERTIARY_SEL_REGOFFSET 0x8c -#define OX820_QUATERNARY_SEL_REGOFFSET 0x94 -#define OX820_DEBUG_SEL_REGOFFSET 0x9c -#define OX820_ALTERNATIVE_SEL_REGOFFSET 0xa4 -#define OX820_PULLUP_SEL_REGOFFSET 0xac -#define OX820_SEC_SECONDARY_SEL_REGOFFSET 0x100014 -#define OX820_SEC_TERTIARY_SEL_REGOFFSET 0x10008c -#define OX820_SEC_QUATERNARY_SEL_REGOFFSET 0x100094 -#define OX820_SEC_DEBUG_SEL_REGOFFSET 0x10009c -#define OX820_SEC_ALTERNATIVE_SEL_REGOFFSET 0x1000a4 -#define OX820_SEC_PULLUP_SEL_REGOFFSET 0x1000ac - -struct oxnas_restart_context { - struct regmap *sys_ctrl; - struct notifier_block restart_handler; -}; - -static int ox820_restart_handle(struct notifier_block *this, - unsigned long mode, void *cmd) -{ - struct oxnas_restart_context *ctx = container_of(this, struct - oxnas_restart_context, - restart_handler); - u32 value; - - /* - * Assert reset to cores as per power on defaults - * Don't touch the DDR interface as things will come to an impromptu - * stop NB Possibly should be asserting reset for PLLB, but there are - * timing concerns here according to the docs - */ - value = BIT(OX820_SYS_CTRL_RST_COPRO) | - BIT(OX820_SYS_CTRL_RST_USBHS) | - BIT(OX820_SYS_CTRL_RST_USBHSPHYA) | - BIT(OX820_SYS_CTRL_RST_MACA) | - BIT(OX820_SYS_CTRL_RST_PCIEA) | - BIT(OX820_SYS_CTRL_RST_SGDMA) | - BIT(OX820_SYS_CTRL_RST_CIPHER) | - BIT(OX820_SYS_CTRL_RST_SATA) | - BIT(OX820_SYS_CTRL_RST_SATA_LINK) | - BIT(OX820_SYS_CTRL_RST_SATA_PHY) | - BIT(OX820_SYS_CTRL_RST_PCIEPHY) | - BIT(OX820_SYS_CTRL_RST_STATIC) | - BIT(OX820_SYS_CTRL_RST_UART1) | - BIT(OX820_SYS_CTRL_RST_UART2) | - BIT(OX820_SYS_CTRL_RST_MISC) | - BIT(OX820_SYS_CTRL_RST_I2S) | - BIT(OX820_SYS_CTRL_RST_SD) | - BIT(OX820_SYS_CTRL_RST_MACB) | - BIT(OX820_SYS_CTRL_RST_PCIEB) | - BIT(OX820_SYS_CTRL_RST_VIDEO) | - BIT(OX820_SYS_CTRL_RST_USBHSPHYB) | - BIT(OX820_SYS_CTRL_RST_USBDEV); - - regmap_write(ctx->sys_ctrl, OX820_RST_SET_REGOFFSET, value); - - /* Release reset to cores as per power on defaults */ - regmap_write(ctx->sys_ctrl, OX820_RST_CLR_REGOFFSET, - BIT(OX820_SYS_CTRL_RST_GPIO)); - - /* - * Disable clocks to cores as per power-on defaults - must leave DDR - * related clocks enabled otherwise we'll stop rather abruptly. - */ - value = BIT(OX820_SYS_CTRL_CLK_COPRO) | - BIT(OX820_SYS_CTRL_CLK_DMA) | - BIT(OX820_SYS_CTRL_CLK_CIPHER) | - BIT(OX820_SYS_CTRL_CLK_SD) | - BIT(OX820_SYS_CTRL_CLK_SATA) | - BIT(OX820_SYS_CTRL_CLK_I2S) | - BIT(OX820_SYS_CTRL_CLK_USBHS) | - BIT(OX820_SYS_CTRL_CLK_MAC) | - BIT(OX820_SYS_CTRL_CLK_PCIEA) | - BIT(OX820_SYS_CTRL_CLK_STATIC) | - BIT(OX820_SYS_CTRL_CLK_MACB) | - BIT(OX820_SYS_CTRL_CLK_PCIEB) | - BIT(OX820_SYS_CTRL_CLK_REF600) | - BIT(OX820_SYS_CTRL_CLK_USBDEV); - - regmap_write(ctx->sys_ctrl, OX820_CLK_CLR_REGOFFSET, value); - - /* Enable clocks to cores as per power-on defaults */ - - /* Set sys-control pin mux'ing as per power-on defaults */ - regmap_write(ctx->sys_ctrl, OX820_SECONDARY_SEL_REGOFFSET, 0); - regmap_write(ctx->sys_ctrl, OX820_TERTIARY_SEL_REGOFFSET, 0); - regmap_write(ctx->sys_ctrl, OX820_QUATERNARY_SEL_REGOFFSET, 0); - regmap_write(ctx->sys_ctrl, OX820_DEBUG_SEL_REGOFFSET, 0); - regmap_write(ctx->sys_ctrl, OX820_ALTERNATIVE_SEL_REGOFFSET, 0); - regmap_write(ctx->sys_ctrl, OX820_PULLUP_SEL_REGOFFSET, 0); - - regmap_write(ctx->sys_ctrl, OX820_SEC_SECONDARY_SEL_REGOFFSET, 0); - regmap_write(ctx->sys_ctrl, OX820_SEC_TERTIARY_SEL_REGOFFSET, 0); - regmap_write(ctx->sys_ctrl, OX820_SEC_QUATERNARY_SEL_REGOFFSET, 0); - regmap_write(ctx->sys_ctrl, OX820_SEC_DEBUG_SEL_REGOFFSET, 0); - regmap_write(ctx->sys_ctrl, OX820_SEC_ALTERNATIVE_SEL_REGOFFSET, 0); - regmap_write(ctx->sys_ctrl, OX820_SEC_PULLUP_SEL_REGOFFSET, 0); - - /* - * No need to save any state, as the ROM loader can determine whether - * reset is due to power cycling or programatic action, just hit the - * (self-clearing) CPU reset bit of the block reset register - */ - value = - BIT(OX820_SYS_CTRL_RST_SCU) | - BIT(OX820_SYS_CTRL_RST_ARM0) | - BIT(OX820_SYS_CTRL_RST_ARM1); - - regmap_write(ctx->sys_ctrl, OX820_RST_SET_REGOFFSET, value); - - pr_emerg("Unable to restart system\n"); - return NOTIFY_DONE; -} - -static int ox820_restart_probe(struct platform_device *pdev) -{ - struct oxnas_restart_context *ctx; - struct regmap *sys_ctrl; - struct device *dev = &pdev->dev; - int err = 0; - - sys_ctrl = syscon_node_to_regmap(pdev->dev.of_node); - if (IS_ERR(sys_ctrl)) - return PTR_ERR(sys_ctrl); - - ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL); - if (!ctx) - return -ENOMEM; - - ctx->sys_ctrl = sys_ctrl; - ctx->restart_handler.notifier_call = ox820_restart_handle; - ctx->restart_handler.priority = 192; - err = register_restart_handler(&ctx->restart_handler); - if (err) - dev_err(dev, "can't register restart notifier (err=%d)\n", err); - - return err; -} - -static const struct of_device_id ox820_restart_of_match[] = { - { .compatible = "oxsemi,ox820-sys-ctrl" }, - {} -}; - -static struct platform_driver ox820_restart_driver = { - .probe = ox820_restart_probe, - .driver = { - .name = "ox820-chip-reset", - .of_match_table = ox820_restart_of_match, - }, -}; -builtin_platform_driver(ox820_restart_driver); |