diff options
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-sprd-adi.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/drivers/spi/spi-sprd-adi.c b/drivers/spi/spi-sprd-adi.c index 74bbd045aac0..197d4b0d81af 100644 --- a/drivers/spi/spi-sprd-adi.c +++ b/drivers/spi/spi-sprd-adi.c @@ -4,6 +4,7 @@ * SPDX-License-Identifier: GPL-2.0 */ +#include <linux/delay.h> #include <linux/hwspinlock.h> #include <linux/init.h> #include <linux/io.h> @@ -12,6 +13,7 @@ #include <linux/of.h> #include <linux/of_device.h> #include <linux/platform_device.h> +#include <linux/reboot.h> #include <linux/spi/spi.h> #include <linux/sizes.h> @@ -67,6 +69,40 @@ #define ADI_READ_TIMEOUT 2000 #define REG_ADDR_LOW_MASK GENMASK(11, 0) +/* Registers definitions for PMIC watchdog controller */ +#define REG_WDG_LOAD_LOW 0x80 +#define REG_WDG_LOAD_HIGH 0x84 +#define REG_WDG_CTRL 0x88 +#define REG_WDG_LOCK 0xa0 + +/* Bits definitions for register REG_WDG_CTRL */ +#define BIT_WDG_RUN BIT(1) +#define BIT_WDG_RST BIT(3) + +/* Registers definitions for PMIC */ +#define PMIC_RST_STATUS 0xee8 +#define PMIC_MODULE_EN 0xc08 +#define PMIC_CLK_EN 0xc18 +#define BIT_WDG_EN BIT(2) + +/* Definition of PMIC reset status register */ +#define HWRST_STATUS_RECOVERY 0x20 +#define HWRST_STATUS_NORMAL 0x40 +#define HWRST_STATUS_ALARM 0x50 +#define HWRST_STATUS_SLEEP 0x60 +#define HWRST_STATUS_FASTBOOT 0x30 +#define HWRST_STATUS_SPECIAL 0x70 +#define HWRST_STATUS_PANIC 0x80 +#define HWRST_STATUS_CFTREBOOT 0x90 +#define HWRST_STATUS_AUTODLOADER 0xa0 +#define HWRST_STATUS_IQMODE 0xb0 +#define HWRST_STATUS_SPRDISK 0xc0 + +/* Use default timeout 50 ms that converts to watchdog values */ +#define WDG_LOAD_VAL ((50 * 1000) / 32768) +#define WDG_LOAD_MASK GENMASK(15, 0) +#define WDG_UNLOCK_KEY 0xe551 + struct sprd_adi { struct spi_controller *ctlr; struct device *dev; @@ -74,6 +110,7 @@ struct sprd_adi { struct hwspinlock *hwlock; unsigned long slave_vbase; unsigned long slave_pbase; + struct notifier_block restart_handler; }; static int sprd_adi_check_paddr(struct sprd_adi *sadi, u32 paddr) @@ -270,6 +307,72 @@ static int sprd_adi_transfer_one(struct spi_controller *ctlr, return 0; } +static int sprd_adi_restart_handler(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + struct sprd_adi *sadi = container_of(this, struct sprd_adi, + restart_handler); + u32 val, reboot_mode = 0; + + if (!cmd) + reboot_mode = HWRST_STATUS_NORMAL; + else if (!strncmp(cmd, "recovery", 8)) + reboot_mode = HWRST_STATUS_RECOVERY; + else if (!strncmp(cmd, "alarm", 5)) + reboot_mode = HWRST_STATUS_ALARM; + else if (!strncmp(cmd, "fastsleep", 9)) + reboot_mode = HWRST_STATUS_SLEEP; + else if (!strncmp(cmd, "bootloader", 10)) + reboot_mode = HWRST_STATUS_FASTBOOT; + else if (!strncmp(cmd, "panic", 5)) + reboot_mode = HWRST_STATUS_PANIC; + else if (!strncmp(cmd, "special", 7)) + reboot_mode = HWRST_STATUS_SPECIAL; + else if (!strncmp(cmd, "cftreboot", 9)) + reboot_mode = HWRST_STATUS_CFTREBOOT; + else if (!strncmp(cmd, "autodloader", 11)) + reboot_mode = HWRST_STATUS_AUTODLOADER; + else if (!strncmp(cmd, "iqmode", 6)) + reboot_mode = HWRST_STATUS_IQMODE; + else if (!strncmp(cmd, "sprdisk", 7)) + reboot_mode = HWRST_STATUS_SPRDISK; + else + reboot_mode = HWRST_STATUS_NORMAL; + + /* Record the reboot mode */ + sprd_adi_read(sadi, sadi->slave_pbase + PMIC_RST_STATUS, &val); + val |= reboot_mode; + sprd_adi_write(sadi, sadi->slave_pbase + PMIC_RST_STATUS, val); + + /* Enable the interface clock of the watchdog */ + sprd_adi_read(sadi, sadi->slave_pbase + PMIC_MODULE_EN, &val); + val |= BIT_WDG_EN; + sprd_adi_write(sadi, sadi->slave_pbase + PMIC_MODULE_EN, val); + + /* Enable the work clock of the watchdog */ + sprd_adi_read(sadi, sadi->slave_pbase + PMIC_CLK_EN, &val); + val |= BIT_WDG_EN; + sprd_adi_write(sadi, sadi->slave_pbase + PMIC_CLK_EN, val); + + /* Unlock the watchdog */ + sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_LOCK, WDG_UNLOCK_KEY); + + /* Load the watchdog timeout value, 50ms is always enough. */ + sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_LOAD_LOW, + WDG_LOAD_VAL & WDG_LOAD_MASK); + sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_LOAD_HIGH, 0); + + /* Start the watchdog to reset system */ + sprd_adi_read(sadi, sadi->slave_pbase + REG_WDG_CTRL, &val); + val |= BIT_WDG_RUN | BIT_WDG_RST; + sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_CTRL, val); + + mdelay(1000); + + dev_emerg(sadi->dev, "Unable to restart system\n"); + return NOTIFY_DONE; +} + static void sprd_adi_hw_init(struct sprd_adi *sadi) { struct device_node *np = sadi->dev->of_node; @@ -383,6 +486,14 @@ static int sprd_adi_probe(struct platform_device *pdev) goto free_hwlock; } + sadi->restart_handler.notifier_call = sprd_adi_restart_handler; + sadi->restart_handler.priority = 128; + ret = register_restart_handler(&sadi->restart_handler); + if (ret) { + dev_err(&pdev->dev, "can not register restart handler\n"); + goto free_hwlock; + } + return 0; free_hwlock: @@ -397,6 +508,7 @@ static int sprd_adi_remove(struct platform_device *pdev) struct spi_controller *ctlr = dev_get_drvdata(&pdev->dev); struct sprd_adi *sadi = spi_controller_get_devdata(ctlr); + unregister_restart_handler(&sadi->restart_handler); hwspin_lock_free(sadi->hwlock); return 0; } |