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watchdog: dw_wdt: Add DebugFS files 

For the sake of the easier device-driver debug procedure, we added a
DebugFS file with the controller registers state. It's available only if
kernel is configured with DebugFS support.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: devicetree@vger.kernel.org
Link: https://lore.kernel.org/r/20200530073557.22661-8-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Serge Semin 2020-05-30 10:35:57 +03:00 committed by Wim Van Sebroeck
parent 46a1946314
commit 4105f19fd0
1 changed files with 68 additions and 0 deletions
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68
drivers/watchdog/dw_wdt.c
View File

@ -28,6 +28,7 @@
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/watchdog.h>
#include <linux/debugfs.h>
#define WDOG_CONTROL_REG_OFFSET 0x00
#define WDOG_CONTROL_REG_WDT_EN_MASK 0x01
@ -39,8 +40,14 @@
#define WDOG_COUNTER_RESTART_KICK_VALUE 0x76
#define WDOG_INTERRUPT_STATUS_REG_OFFSET 0x10
#define WDOG_INTERRUPT_CLEAR_REG_OFFSET 0x14
#define WDOG_COMP_PARAMS_5_REG_OFFSET 0xe4
#define WDOG_COMP_PARAMS_4_REG_OFFSET 0xe8
#define WDOG_COMP_PARAMS_3_REG_OFFSET 0xec
#define WDOG_COMP_PARAMS_2_REG_OFFSET 0xf0
#define WDOG_COMP_PARAMS_1_REG_OFFSET 0xf4
#define WDOG_COMP_PARAMS_1_USE_FIX_TOP BIT(6)
#define WDOG_COMP_VERSION_REG_OFFSET 0xf8
#define WDOG_COMP_TYPE_REG_OFFSET 0xfc
/* There are sixteen TOPs (timeout periods) that can be set in the watchdog. */
#define DW_WDT_NUM_TOPS 16
@ -85,6 +92,10 @@ struct dw_wdt {
/* Save/restore */
u32 control;
u32 timeout;
#ifdef CONFIG_DEBUG_FS
struct dentry *dbgfs_dir;
#endif
};
#define to_dw_wdt(wdd) container_of(wdd, struct dw_wdt, wdd)
@ -484,6 +495,59 @@ static int dw_wdt_init_timeouts(struct dw_wdt *dw_wdt, struct device *dev)
return 0;
}
#ifdef CONFIG_DEBUG_FS
#define DW_WDT_DBGFS_REG(_name, _off) \
{ \
.name = _name, \
.offset = _off \
}
static const struct debugfs_reg32 dw_wdt_dbgfs_regs[] = {
DW_WDT_DBGFS_REG("cr", WDOG_CONTROL_REG_OFFSET),
DW_WDT_DBGFS_REG("torr", WDOG_TIMEOUT_RANGE_REG_OFFSET),
DW_WDT_DBGFS_REG("ccvr", WDOG_CURRENT_COUNT_REG_OFFSET),
DW_WDT_DBGFS_REG("crr", WDOG_COUNTER_RESTART_REG_OFFSET),
DW_WDT_DBGFS_REG("stat", WDOG_INTERRUPT_STATUS_REG_OFFSET),
DW_WDT_DBGFS_REG("param5", WDOG_COMP_PARAMS_5_REG_OFFSET),
DW_WDT_DBGFS_REG("param4", WDOG_COMP_PARAMS_4_REG_OFFSET),
DW_WDT_DBGFS_REG("param3", WDOG_COMP_PARAMS_3_REG_OFFSET),
DW_WDT_DBGFS_REG("param2", WDOG_COMP_PARAMS_2_REG_OFFSET),
DW_WDT_DBGFS_REG("param1", WDOG_COMP_PARAMS_1_REG_OFFSET),
DW_WDT_DBGFS_REG("version", WDOG_COMP_VERSION_REG_OFFSET),
DW_WDT_DBGFS_REG("type", WDOG_COMP_TYPE_REG_OFFSET)
};
static void dw_wdt_dbgfs_init(struct dw_wdt *dw_wdt)
{
struct device *dev = dw_wdt->wdd.parent;
struct debugfs_regset32 *regset;
regset = devm_kzalloc(dev, sizeof(*regset), GFP_KERNEL);
if (!regset)
return;
regset->regs = dw_wdt_dbgfs_regs;
regset->nregs = ARRAY_SIZE(dw_wdt_dbgfs_regs);
regset->base = dw_wdt->regs;
dw_wdt->dbgfs_dir = debugfs_create_dir(dev_name(dev), NULL);
debugfs_create_regset32("registers", 0444, dw_wdt->dbgfs_dir, regset);
}
static void dw_wdt_dbgfs_clear(struct dw_wdt *dw_wdt)
{
debugfs_remove_recursive(dw_wdt->dbgfs_dir);
}
#else /* !CONFIG_DEBUG_FS */
static void dw_wdt_dbgfs_init(struct dw_wdt *dw_wdt) {}
static void dw_wdt_dbgfs_clear(struct dw_wdt *dw_wdt) {}
#endif /* !CONFIG_DEBUG_FS */
static int dw_wdt_drv_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -607,6 +671,8 @@ static int dw_wdt_drv_probe(struct platform_device *pdev)
if (ret)
goto out_disable_pclk;
dw_wdt_dbgfs_init(dw_wdt);
return 0;
out_disable_pclk:
@ -621,6 +687,8 @@ static int dw_wdt_drv_remove(struct platform_device *pdev)
{
struct dw_wdt *dw_wdt = platform_get_drvdata(pdev);
dw_wdt_dbgfs_clear(dw_wdt);
watchdog_unregister_device(&dw_wdt->wdd);
reset_control_assert(dw_wdt->rst);
clk_disable_unprepare(dw_wdt->pclk);