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Message-Id: <20230314152916.185939-1-william.gray@linaro.org>
Date: Tue, 14 Mar 2023 11:29:16 -0400
From: William Breathitt Gray <william.gray@...aro.org>
To: Wim Van Sebroeck <wim@...ux-watchdog.org>,
Guenter Roeck <linux@...ck-us.net>
Cc: linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
Paul Demetrotion <pdemetrotion@...systems.com>,
techsupport@...systems.com,
William Breathitt Gray <william.gray@...aro.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v2] watchdog: ebc-c384_wdt: Migrate to the regmap API
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 <andriy.shevchenko@...ux.intel.com>
Signed-off-by: William Breathitt Gray <william.gray@...aro.org>
---
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(-)
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 <linux/bits.h>
#include <linux/device.h>
#include <linux/dmi.h>
-#include <linux/errno.h>
-#include <linux/io.h>
-#include <linux/ioport.h>
+#include <linux/err.h>
#include <linux/isa.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
+#include <linux/regmap.h>
#include <linux/types.h>
#include <linux/watchdog.h>
@@ -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);
base-commit: fe15c26ee26efa11741a7b632e9f23b01aca4cc6
--
2.39.2
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