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[69.109.179.158]) by smtp.gmail.com with ESMTPSA id 207-20020a3704d8000000b0074575572030sm1985474qke.1.2023.03.14.08.29.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Mar 2023 08:29:30 -0700 (PDT) From: William Breathitt Gray To: Wim Van Sebroeck , Guenter Roeck Cc: linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org, Paul Demetrotion , techsupport@winsystems.com, William Breathitt Gray , Andy Shevchenko Subject: [PATCH v2] watchdog: ebc-c384_wdt: Migrate to the regmap API Date: Tue, 14 Mar 2023 11:29:16 -0400 Message-Id: <20230314152916.185939-1-william.gray@linaro.org> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org The regmap API supports IO port accessors so we can take advantage of regmap abstractions rather than handling access to the device registers directly in the driver. Suggested-by: Andy Shevchenko Signed-off-by: William Breathitt Gray --- Changes in v2: - Utilize watchdog_set_drvdata() and watchdog_get_drvdata() - Map watchdog control registers based on offset 0x1 and adjust regmap configurations accordingly; offset 0x0 is unused in this driver so we should avoid unnecessary exposure of it drivers/watchdog/Kconfig | 1 + drivers/watchdog/ebc-c384_wdt.c | 67 +++++++++++++++++++++++---------- 2 files changed, 49 insertions(+), 19 deletions(-) base-commit: fe15c26ee26efa11741a7b632e9f23b01aca4cc6 diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index f0872970daf9..301cfe79263c 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -1089,6 +1089,7 @@ config EBC_C384_WDT tristate "WinSystems EBC-C384 Watchdog Timer" depends on X86 select ISA_BUS_API + select REGMAP_MMIO select WATCHDOG_CORE help Enables watchdog timer support for the watchdog timer on the diff --git a/drivers/watchdog/ebc-c384_wdt.c b/drivers/watchdog/ebc-c384_wdt.c index 8ef4b0df3855..2f9fec5073b3 100644 --- a/drivers/watchdog/ebc-c384_wdt.c +++ b/drivers/watchdog/ebc-c384_wdt.c @@ -3,15 +3,15 @@ * Watchdog timer driver for the WinSystems EBC-C384 * Copyright (C) 2016 William Breathitt Gray */ +#include #include #include -#include -#include -#include +#include #include #include #include #include +#include #include #include @@ -24,8 +24,14 @@ #define WATCHDOG_MAX_TIMEOUT 15300 #define BASE_ADDR 0x564 #define ADDR_EXTENT 5 -#define CFG_ADDR (BASE_ADDR + 1) -#define PET_ADDR (BASE_ADDR + 2) +#define CTRL_BASE_ADDR (BASE_ADDR + 0x1) +#define CTRL_ADDR_EXTENT 2 +#define CTRL_MAX_REGISTER (CTRL_ADDR_EXTENT - 1) +#define CFG_REG 0x0 +#define PET_REG 0x1 +#define CFG_MINUTES 0x00 +#define CFG_SECONDS BIT(7) +#define PET_DISABLED 0x00 static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); @@ -37,43 +43,54 @@ module_param(timeout, uint, 0); MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); +static const struct regmap_range ebc_c384_wdt_wr_ranges[] = { + regmap_reg_range(0x0, 0x1), +}; +static const struct regmap_access_table ebc_c384_wdt_wr_table = { + .yes_ranges = ebc_c384_wdt_wr_ranges, + .n_yes_ranges = ARRAY_SIZE(ebc_c384_wdt_wr_ranges), +}; +static const struct regmap_config ebc_c384_wdt_regmap_config = { + .reg_bits = 8, + .reg_stride = 1, + .val_bits = 8, + .io_port = true, + .max_register = CTRL_MAX_REGISTER, + .wr_table = &ebc_c384_wdt_wr_table, +}; + static int ebc_c384_wdt_start(struct watchdog_device *wdev) { + struct regmap *const map = watchdog_get_drvdata(wdev); unsigned t = wdev->timeout; /* resolution is in minutes for timeouts greater than 255 seconds */ if (t > 255) t = DIV_ROUND_UP(t, 60); - outb(t, PET_ADDR); - - return 0; + return regmap_write(map, PET_REG, t); } static int ebc_c384_wdt_stop(struct watchdog_device *wdev) { - outb(0x00, PET_ADDR); + struct regmap *const map = watchdog_get_drvdata(wdev); - return 0; + return regmap_write(map, PET_REG, PET_DISABLED); } static int ebc_c384_wdt_set_timeout(struct watchdog_device *wdev, unsigned t) { + struct regmap *const map = watchdog_get_drvdata(wdev); + /* resolution is in minutes for timeouts greater than 255 seconds */ if (t > 255) { /* round second resolution up to minute granularity */ wdev->timeout = roundup(t, 60); - - /* set watchdog timer for minutes */ - outb(0x00, CFG_ADDR); - } else { - wdev->timeout = t; - - /* set watchdog timer for seconds */ - outb(0x80, CFG_ADDR); + return regmap_write(map, CFG_REG, CFG_MINUTES); } - return 0; + wdev->timeout = t; + return regmap_write(map, CFG_REG, CFG_SECONDS); } static const struct watchdog_ops ebc_c384_wdt_ops = { @@ -89,6 +106,8 @@ static const struct watchdog_info ebc_c384_wdt_info = { static int ebc_c384_wdt_probe(struct device *dev, unsigned int id) { + void __iomem *regs; + struct regmap *map; struct watchdog_device *wdd; if (!devm_request_region(dev, BASE_ADDR, ADDR_EXTENT, dev_name(dev))) { @@ -97,6 +116,15 @@ static int ebc_c384_wdt_probe(struct device *dev, unsigned int id) return -EBUSY; } + regs = devm_ioport_map(dev, CTRL_BASE_ADDR, CTRL_ADDR_EXTENT); + if (!regs) + return -ENOMEM; + + map = devm_regmap_init_mmio(dev, regs, &ebc_c384_wdt_regmap_config); + if (IS_ERR(map)) + return dev_err_probe(dev, PTR_ERR(map), + "Unable to initialize register map\n"); + wdd = devm_kzalloc(dev, sizeof(*wdd), GFP_KERNEL); if (!wdd) return -ENOMEM; @@ -107,6 +135,7 @@ static int ebc_c384_wdt_probe(struct device *dev, unsigned int id) wdd->min_timeout = 1; wdd->max_timeout = WATCHDOG_MAX_TIMEOUT; + watchdog_set_drvdata(wdd, map); watchdog_set_nowayout(wdd, nowayout); watchdog_init_timeout(wdd, timeout, dev);