From: Nathan Barrett-Morrison nathan.morrison@timesys.com
Co-developed-by: Greg Malysa greg.malysa@timesys.com Signed-off-by: Greg Malysa greg.malysa@timesys.com Co-developed-by: Ian Roberts ian.roberts@timesys.com Signed-off-by: Ian Roberts ian.roberts@timesys.com Signed-off-by: Vasileios Bimpikas vasileios.bimpikas@analog.com Signed-off-by: Utsav Agarwal utsav.agarwal@analog.com Signed-off-by: Arturs Artamonovs arturs.artamonovs@analog.com Signed-off-by: Nathan Barrett-Morrison nathan.morrison@timesys.com ---
MAINTAINERS | 1 + drivers/watchdog/Kconfig | 9 +++ drivers/watchdog/Makefile | 1 + drivers/watchdog/adi_wdt.c | 145 +++++++++++++++++++++++++++++++++++++ 4 files changed, 156 insertions(+) create mode 100644 drivers/watchdog/adi_wdt.c
diff --git a/MAINTAINERS b/MAINTAINERS index c1685f0352..6feb7e540b 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -618,6 +618,7 @@ F: drivers/pinctrl/pinctrl-adi-adsp.c F: drivers/serial/serial_adi_uart4.c F: drivers/timer/adi_sc5xx_timer.c F: drivers/usb/musb-new/sc5xx.c +F: drivers/watchdog/adi_wdt.c F: include/env/adi/
ARM SNAPDRAGON diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 8318fd77a3..5a62000272 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -94,6 +94,15 @@ config WDT_APPLE The watchdog will perform a full SoC reset resulting in a reboot of the entire system.
+config WDT_ADI + bool "Analog Devices watchdog timer support" + select WDT + select SPL_WDT if SPL + depends on (SC57X || SC58X || SC59X || SC59X_64) + help + Enable this to support Watchdog Timer on ADI SC57X, SC58X, SC59X, + and SC59X_64 processors + config WDT_ARMADA_37XX bool "Marvell Armada 37xx watchdog timer support" depends on WDT && ARMADA_3700 diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 7b39adcf0f..7ad61b513c 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -50,3 +50,4 @@ obj-$(CONFIG_WDT_STM32MP) += stm32mp_wdt.o obj-$(CONFIG_WDT_SUNXI) += sunxi_wdt.o obj-$(CONFIG_WDT_TANGIER) += tangier_wdt.o obj-$(CONFIG_WDT_XILINX) += xilinx_wwdt.o +obj-$(CONFIG_WDT_ADI) += adi_wdt.o diff --git a/drivers/watchdog/adi_wdt.c b/drivers/watchdog/adi_wdt.c new file mode 100644 index 0000000000..67d17dc692 --- /dev/null +++ b/drivers/watchdog/adi_wdt.c @@ -0,0 +1,145 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * (C) Copyright 2022 - Analog Devices, Inc. + * + * Written and/or maintained by Timesys Corporation + * + * Converted to driver model by Nathan Barrett-Morrison + * + * Contact: Nathan Barrett-Morrison nathan.morrison@timesys.com + * Contact: Greg Malysa greg.malysa@timesys.com + * + * adi_wtd.c - driver for ADI on-chip watchdog + * + */ + +#include <clk.h> +#include <dm.h> +#include <wdt.h> +#include <linux/delay.h> +#include <linux/ioport.h> +#include <linux/io.h> + +#define WDOG_CTL 0x0 +#define WDOG_CNT 0x4 +#define WDOG_STAT 0x8 + +#define RCU_CTL 0x0 +#define RCU_STAT 0x4 + +#define SEC_GCTL 0x0 +#define SEC_FCTL 0x10 +#define SEC_SCTL0 0x800 + +#define WDEN 0x0010 +#define WDDIS 0x0AD0 + +struct adi_wdt_priv { + void __iomem *rcu_base; + void __iomem *sec_base; + void __iomem *wdt_base; + struct clk clock; +}; + +static int adi_wdt_reset(struct udevice *dev) +{ + struct adi_wdt_priv *priv = dev_get_priv(dev); + + writel(0, priv->wdt_base + WDOG_STAT); + + return 0; +} + +static int adi_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags) +{ + struct adi_wdt_priv *priv = dev_get_priv(dev); + u32 sctl_val; + + /* Disable SYSCD_RESETb input and clear the RCU0 reset status */ + writel(0xf, priv->rcu_base + RCU_STAT); + writel(0x0, priv->rcu_base + RCU_CTL); + + /* reset the SEC controller */ + writel(0x2, priv->sec_base + SEC_GCTL); + writel(0x2, priv->sec_base + SEC_FCTL); + + udelay(50); + + /* enable SEC fault event */ + writel(0x1, priv->sec_base + SEC_GCTL); + + /* ANOMALY 36100004 Spurious External Fault event occurs when FCTL + * is re-programmed when currently active fault is not cleared + */ + writel(0xc0, priv->sec_base + SEC_FCTL); + writel(0xc1, priv->sec_base + SEC_FCTL); + + /* enable SEC fault source for watchdog0 */ + sctl_val = readl((priv->sec_base + SEC_SCTL0) + 3 * 8) | 0x6; + writel(sctl_val, (priv->sec_base + SEC_SCTL0) + 3 * 8); + + /* Enable SYSCD_RESETb input */ + writel(0x100, priv->rcu_base + RCU_CTL); + + /* enable watchdog0 */ + writel(WDDIS, priv->wdt_base + WDOG_CTL); + + writel(timeout_ms / 1000 * + (clk_get_rate(&priv->clock) / (IS_ENABLED(CONFIG_SC58X) ? 2 : 1)), + priv->wdt_base + WDOG_CNT); + + writel(0, priv->wdt_base + WDOG_STAT); + writel(WDEN, priv->wdt_base + WDOG_CTL); + + return 0; +} + +static int adi_wdt_probe(struct udevice *dev) +{ + struct adi_wdt_priv *priv = dev_get_priv(dev); + int ret; + struct resource res; + + ret = dev_read_resource_byname(dev, "rcu", &res); + if (ret) + return ret; + priv->rcu_base = devm_ioremap(dev, res.start, resource_size(&res)); + + ret = dev_read_resource_byname(dev, "sec", &res); + if (ret) + return ret; + priv->sec_base = devm_ioremap(dev, res.start, resource_size(&res)); + + ret = dev_read_resource_byname(dev, "wdt", &res); + if (ret) + return ret; + priv->wdt_base = devm_ioremap(dev, res.start, resource_size(&res)); + + ret = clk_get_by_name(dev, "sclk0", &priv->clock); + if (ret < 0) { + printf("Can't get WDT clk: %d\n", ret); + return ret; + } + + return 0; +} + +static const struct wdt_ops adi_wdt_ops = { + .start = adi_wdt_start, + .reset = adi_wdt_reset, +}; + +static const struct udevice_id adi_wdt_ids[] = { + { .compatible = "adi,wdt" }, + {} +}; + +U_BOOT_DRIVER(adi_wdt) = { + .name = "adi_wdt", + .id = UCLASS_WDT, + .of_match = adi_wdt_ids, + .probe = adi_wdt_probe, + .ops = &adi_wdt_ops, + .priv_auto = sizeof(struct adi_wdt_priv), + .flags = DM_FLAG_PRE_RELOC, +};