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Signed-off-by: Lad Prabhakar --- drivers/watchdog/Kconfig | 8 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/rzv2h_wdt.c | 248 +++++++++++++++++++++++++++++++++++ 3 files changed, 257 insertions(+) create mode 100644 drivers/watchdog/rzv2h_wdt.c diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 85eea38dbdf4..3f7bcc10ccc2 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -938,6 +938,14 @@ config RENESAS_RZG2LWDT This driver adds watchdog support for the integrated watchdogs in the Renesas RZ/G2L SoCs. These watchdogs can be used to reset a system. +config RENESAS_RZV2HWDT + tristate "Renesas RZ/V2H(P) WDT Watchdog" + depends on ARCH_RENESAS || COMPILE_TEST + select WATCHDOG_CORE + help + This driver adds watchdog support for the integrated watchdogs in the + Renesas RZ/V2H(P) SoCs. These watchdogs can be used to reset a system. + config ASPEED_WATCHDOG tristate "Aspeed BMC watchdog support" depends on ARCH_ASPEED || COMPILE_TEST diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 2d1117564f5b..295909a1b3b9 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -86,6 +86,7 @@ obj-$(CONFIG_RENESAS_WDT) += renesas_wdt.o obj-$(CONFIG_RENESAS_RZAWDT) += rza_wdt.o obj-$(CONFIG_RENESAS_RZN1WDT) += rzn1_wdt.o obj-$(CONFIG_RENESAS_RZG2LWDT) += rzg2l_wdt.o +obj-$(CONFIG_RENESAS_RZV2HWDT) += rzv2h_wdt.o obj-$(CONFIG_ASPEED_WATCHDOG) += aspeed_wdt.o obj-$(CONFIG_STM32_WATCHDOG) += stm32_iwdg.o obj-$(CONFIG_UNIPHIER_WATCHDOG) += uniphier_wdt.o diff --git a/drivers/watchdog/rzv2h_wdt.c b/drivers/watchdog/rzv2h_wdt.c new file mode 100644 index 000000000000..08f97b4bab7f --- /dev/null +++ b/drivers/watchdog/rzv2h_wdt.c @@ -0,0 +1,248 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Renesas RZ/V2H(P) WDT Watchdog Driver + * + * Copyright (C) 2024 Renesas Electronics Corporation. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define WDTRR 0x00 /* RW, 8 */ +#define WDTCR 0x02 /* RW, 16 */ +#define WDTRCR 0x06 /* RW, 8 */ + +#define WDTCR_TOPS_1024 0x00 +#define WDTCR_TOPS_16384 0x03 + +#define WDTCR_CKS_CLK_1 0x00 +#define WDTCR_CKS_CLK_256 0x50 + +#define WDTCR_RPES_0 0x300 +#define WDTCR_RPES_75 0x000 + +#define WDTCR_RPSS_25 0x00 +#define WDTCR_RPSS_100 0x3000 + +#define WDTRCR_RSTIRQS BIT(7) + +#define CLOCK_DIV_BY_256 256 + +#define WDT_DEFAULT_TIMEOUT 60U + +static bool nowayout = WATCHDOG_NOWAYOUT; +module_param(nowayout, bool, 0); +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); + +struct rzv2h_wdt_priv { + void __iomem *base; + struct watchdog_device wdev; + struct reset_control *rstc; + unsigned long oscclk_rate; +}; + +static u32 rzv2h_wdt_get_cycle_usec(struct rzv2h_wdt_priv *priv, + unsigned long cycle, + u16 wdttime) +{ + int clock_division_ratio; + u64 timer_cycle_us; + + clock_division_ratio = CLOCK_DIV_BY_256; + + timer_cycle_us = clock_division_ratio * (wdttime + 1) * MICRO; + + return div64_ul(timer_cycle_us, cycle); +} + +static int rzv2h_wdt_ping(struct watchdog_device *wdev) +{ + struct rzv2h_wdt_priv *priv = watchdog_get_drvdata(wdev); + unsigned long delay; + + writeb(0x0, priv->base + WDTRR); + writeb(0xFF, priv->base + WDTRR); + + /* + * Refreshing the down-counter requires up to 4 cycles + * of the signal for counting + */ + delay = 4 * rzv2h_wdt_get_cycle_usec(priv, priv->oscclk_rate, 0); + udelay(delay); + + return 0; +} + +static void rzv2h_wdt_setup(struct watchdog_device *wdev, u16 wdtcr) +{ + struct rzv2h_wdt_priv *priv = watchdog_get_drvdata(wdev); + + writew(wdtcr, priv->base + WDTCR); + + /* LSI needs RSTIRQS to be cleared */ + writeb(readb(priv->base + WDTRCR) & ~WDTRCR_RSTIRQS, priv->base + WDTRCR); +} + +static int rzv2h_wdt_start(struct watchdog_device *wdev) +{ + pm_runtime_get_sync(wdev->parent); + + /* + * WDTCR + * - CKS[7:4] - Clock Division Ratio Select - 0101b: oscclk/256 + * - RPSS[13:12] - Window Start Position Select - 11b: 100% + * - RPES[9:8] - Window End Position Select - 11b: 0% + * - TOPS[1:0] - Timeout Period Select - 11b: 16384 cycles (3FFFh) + */ + rzv2h_wdt_setup(wdev, WDTCR_CKS_CLK_256 | WDTCR_RPSS_100 | + WDTCR_RPES_0 | WDTCR_TOPS_16384); + + rzv2h_wdt_ping(wdev); + + return 0; +} + +static int rzv2h_wdt_stop(struct watchdog_device *wdev) +{ + struct rzv2h_wdt_priv *priv = watchdog_get_drvdata(wdev); + + pm_runtime_put(wdev->parent); + reset_control_reset(priv->rstc); + + return 0; +} + +static const struct watchdog_info rzv2h_wdt_ident = { + .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT, + .identity = "Renesas RZ/V2H WDT Watchdog", +}; + +static int rzv2h_wdt_restart(struct watchdog_device *wdev, + unsigned long action, void *data) +{ + rzv2h_wdt_stop(wdev); + + pm_runtime_get_sync(wdev->parent); + + /* + * WDTCR + * - CKS[7:4] - Clock Division Ratio Select - 0000b: oscclk/1 + * - RPSS[13:12] - Window Start Position Select - 00b: 25% + * - RPES[9:8] - Window End Position Select - 00b: 75% + * - TOPS[1:0] - Timeout Period Select - 00b: 1024 cycles (03FFh) + */ + rzv2h_wdt_setup(wdev, WDTCR_CKS_CLK_1 | WDTCR_RPSS_25 | + WDTCR_RPES_75 | WDTCR_TOPS_1024); + + rzv2h_wdt_ping(wdev); + + return 0; +} + +static const struct watchdog_ops rzv2h_wdt_ops = { + .owner = THIS_MODULE, + .start = rzv2h_wdt_start, + .stop = rzv2h_wdt_stop, + .ping = rzv2h_wdt_ping, + .restart = rzv2h_wdt_restart, +}; + +static void rzv2h_wdt_reset_assert(void *data) +{ + struct reset_control *rstc = data; + + reset_control_assert(rstc); +} + +static int rzv2h_wdt_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct rzv2h_wdt_priv *priv; + struct clk *oscclk; + unsigned long rate; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + /* Get watchdog oscclk clock */ + oscclk = clk_get(&pdev->dev, "oscclk"); + if (IS_ERR(oscclk)) + return dev_err_probe(&pdev->dev, PTR_ERR(oscclk), + "no oscclk"); + + priv->oscclk_rate = clk_get_rate(oscclk); + clk_put(oscclk); + if (!priv->oscclk_rate) + return dev_err_probe(&pdev->dev, -EINVAL, "oscclk rate is 0"); + + priv->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL); + if (IS_ERR(priv->rstc)) + return dev_err_probe(&pdev->dev, PTR_ERR(priv->rstc), + "failed to get cpg reset"); + + ret = reset_control_deassert(priv->rstc); + if (ret) + return dev_err_probe(dev, ret, "failed to deassert"); + ret = devm_add_action_or_reset(&pdev->dev, + rzv2h_wdt_reset_assert, + priv->rstc); + if (ret < 0) + return ret; + + rate = priv->oscclk_rate / 256; + priv->wdev.max_hw_heartbeat_ms = (1000 * 16383) / rate; + dev_dbg(dev, "max hw timeout of %dms\n", + priv->wdev.max_hw_heartbeat_ms); + + priv->wdev.min_timeout = 1; + priv->wdev.timeout = WDT_DEFAULT_TIMEOUT; + priv->wdev.info = &rzv2h_wdt_ident; + priv->wdev.ops = &rzv2h_wdt_ops; + priv->wdev.parent = dev; + watchdog_set_drvdata(&priv->wdev, priv); + watchdog_set_nowayout(&priv->wdev, nowayout); + watchdog_stop_on_unregister(&priv->wdev); + + ret = watchdog_init_timeout(&priv->wdev, 0, dev); + if (ret) + dev_warn(dev, "Specified timeout invalid, using default"); + + ret = devm_pm_runtime_enable(&pdev->dev); + if (ret) + return ret; + + return devm_watchdog_register_device(&pdev->dev, &priv->wdev); +} + +static const struct of_device_id rzv2h_wdt_ids[] = { + { .compatible = "renesas,r9a09g057-wdt", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, rzv2h_wdt_ids); + +static struct platform_driver rzv2h_wdt_driver = { + .driver = { + .name = "rzv2h_wdt", + .of_match_table = rzv2h_wdt_ids, + }, + .probe = rzv2h_wdt_probe, +}; +module_platform_driver(rzv2h_wdt_driver); +MODULE_AUTHOR("Lad Prabhakar "); +MODULE_DESCRIPTION("Renesas RZ/V2H(P) WDT Watchdog Driver");