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Message-ID: <20110414190238.GI4835@earth.li>
Date: Thu, 14 Apr 2011 12:02:39 -0700
From: Jonathan McDowell <noodles@...th.li>
To: Wim Van Sebroeck <wim@...ana.be>
Cc: linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] Cleanup pc87413 watchdog driver to use
request_muxed_region for SuperIO area
Inspired by Nat Gurumoorthy's recent patches for cleaning up the it87
drivers to use request_muxed_region for accessing the SuperIO area on
these chips, and the fact I have a GPIO driver for the pc8741x basically
ready for submission, here is a patch to cleanup the pc87413 watchdog
driver to use request_muxed_region for accessing the SuperIO area.
It also pulls out the details about the SWC IO area on initial driver
load, and properly does a request_region for that area - there's no
requirement to touch the SuperIO area after doing the initial watchdog
enable and IO base retrieval.
While I have hardware with a pc87413 on it it is not wired in a way that
allows the watchdog to reboot the machine, so I have not been able to
fully test these changes - I have checked that the driver correctly
initialises itself still and requests the SWC io region ok.
Signed-Off-By: Jonathan McDowell <noodles@...th.li>
-------
diff --git a/drivers/watchdog/pc87413_wdt.c b/drivers/watchdog/pc87413_wdt.c
index b7c1390..e78d899 100644
--- a/drivers/watchdog/pc87413_wdt.c
+++ b/drivers/watchdog/pc87413_wdt.c
@@ -56,6 +56,7 @@
#define IO_DEFAULT 0x2E /* Address used on Portwell Boards */
static int io = IO_DEFAULT;
+static int swc_base_addr = -1;
static int timeout = DEFAULT_TIMEOUT; /* timeout value */
static unsigned long timer_enabled; /* is the timer enabled? */
@@ -116,9 +117,8 @@ static inline void pc87413_enable_swc(void)
/* Read SWC I/O base address */
-static inline unsigned int pc87413_get_swc_base(void)
+static void pc87413_get_swc_base_addr(void)
{
- unsigned int swc_base_addr = 0;
unsigned char addr_l, addr_h = 0;
/* Step 3: Read SWC I/O Base Address */
@@ -136,12 +136,11 @@ static inline unsigned int pc87413_get_swc_base(void)
"Read SWC I/O Base Address: low %d, high %d, res %d\n",
addr_l, addr_h, swc_base_addr);
#endif
- return swc_base_addr;
}
/* Select Bank 3 of SWC */
-static inline void pc87413_swc_bank3(unsigned int swc_base_addr)
+static inline void pc87413_swc_bank3(void)
{
/* Step 4: Select Bank3 of SWC */
outb_p(inb(swc_base_addr + 0x0f) | 0x03, swc_base_addr + 0x0f);
@@ -152,8 +151,7 @@ static inline void pc87413_swc_bank3(unsigned int swc_base_addr)
/* Set watchdog timeout to x minutes */
-static inline void pc87413_programm_wdto(unsigned int swc_base_addr,
- char pc87413_time)
+static inline void pc87413_programm_wdto(char pc87413_time)
{
/* Step 5: Programm WDTO, Twd. */
outb_p(pc87413_time, swc_base_addr + WDTO);
@@ -164,7 +162,7 @@ static inline void pc87413_programm_wdto(unsigned int swc_base_addr,
/* Enable WDEN */
-static inline void pc87413_enable_wden(unsigned int swc_base_addr)
+static inline void pc87413_enable_wden(void)
{
/* Step 6: Enable WDEN */
outb_p(inb(swc_base_addr + WDCTL) | 0x01, swc_base_addr + WDCTL);
@@ -174,7 +172,7 @@ static inline void pc87413_enable_wden(unsigned int swc_base_addr)
}
/* Enable SW_WD_TREN */
-static inline void pc87413_enable_sw_wd_tren(unsigned int swc_base_addr)
+static inline void pc87413_enable_sw_wd_tren(void)
{
/* Enable SW_WD_TREN */
outb_p(inb(swc_base_addr + WDCFG) | 0x80, swc_base_addr + WDCFG);
@@ -185,7 +183,7 @@ static inline void pc87413_enable_sw_wd_tren(unsigned int swc_base_addr)
/* Disable SW_WD_TREN */
-static inline void pc87413_disable_sw_wd_tren(unsigned int swc_base_addr)
+static inline void pc87413_disable_sw_wd_tren(void)
{
/* Disable SW_WD_TREN */
outb_p(inb(swc_base_addr + WDCFG) & 0x7f, swc_base_addr + WDCFG);
@@ -196,7 +194,7 @@ static inline void pc87413_disable_sw_wd_tren(unsigned int swc_base_addr)
/* Enable SW_WD_TRG */
-static inline void pc87413_enable_sw_wd_trg(unsigned int swc_base_addr)
+static inline void pc87413_enable_sw_wd_trg(void)
{
/* Enable SW_WD_TRG */
outb_p(inb(swc_base_addr + WDCTL) | 0x80, swc_base_addr + WDCTL);
@@ -207,7 +205,7 @@ static inline void pc87413_enable_sw_wd_trg(unsigned int swc_base_addr)
/* Disable SW_WD_TRG */
-static inline void pc87413_disable_sw_wd_trg(unsigned int swc_base_addr)
+static inline void pc87413_disable_sw_wd_trg(void)
{
/* Disable SW_WD_TRG */
outb_p(inb(swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL);
@@ -222,18 +220,13 @@ static inline void pc87413_disable_sw_wd_trg(unsigned int swc_base_addr)
static void pc87413_enable(void)
{
- unsigned int swc_base_addr;
-
spin_lock(&io_lock);
- pc87413_select_wdt_out();
- pc87413_enable_swc();
- swc_base_addr = pc87413_get_swc_base();
- pc87413_swc_bank3(swc_base_addr);
- pc87413_programm_wdto(swc_base_addr, timeout);
- pc87413_enable_wden(swc_base_addr);
- pc87413_enable_sw_wd_tren(swc_base_addr);
- pc87413_enable_sw_wd_trg(swc_base_addr);
+ pc87413_swc_bank3();
+ pc87413_programm_wdto(timeout);
+ pc87413_enable_wden();
+ pc87413_enable_sw_wd_tren();
+ pc87413_enable_sw_wd_trg();
spin_unlock(&io_lock);
}
@@ -242,17 +235,12 @@ static void pc87413_enable(void)
static void pc87413_disable(void)
{
- unsigned int swc_base_addr;
-
spin_lock(&io_lock);
- pc87413_select_wdt_out();
- pc87413_enable_swc();
- swc_base_addr = pc87413_get_swc_base();
- pc87413_swc_bank3(swc_base_addr);
- pc87413_disable_sw_wd_tren(swc_base_addr);
- pc87413_disable_sw_wd_trg(swc_base_addr);
- pc87413_programm_wdto(swc_base_addr, 0);
+ pc87413_swc_bank3();
+ pc87413_disable_sw_wd_tren();
+ pc87413_disable_sw_wd_trg();
+ pc87413_programm_wdto(0);
spin_unlock(&io_lock);
}
@@ -261,20 +249,15 @@ static void pc87413_disable(void)
static void pc87413_refresh(void)
{
- unsigned int swc_base_addr;
-
spin_lock(&io_lock);
- pc87413_select_wdt_out();
- pc87413_enable_swc();
- swc_base_addr = pc87413_get_swc_base();
- pc87413_swc_bank3(swc_base_addr);
- pc87413_disable_sw_wd_tren(swc_base_addr);
- pc87413_disable_sw_wd_trg(swc_base_addr);
- pc87413_programm_wdto(swc_base_addr, timeout);
- pc87413_enable_wden(swc_base_addr);
- pc87413_enable_sw_wd_tren(swc_base_addr);
- pc87413_enable_sw_wd_trg(swc_base_addr);
+ pc87413_swc_bank3();
+ pc87413_disable_sw_wd_tren();
+ pc87413_disable_sw_wd_trg();
+ pc87413_programm_wdto(timeout);
+ pc87413_enable_wden();
+ pc87413_enable_sw_wd_tren();
+ pc87413_enable_sw_wd_trg();
spin_unlock(&io_lock);
}
@@ -528,7 +511,8 @@ static int __init pc87413_init(void)
printk(KERN_INFO PFX "Version " VERSION " at io 0x%X\n",
WDT_INDEX_IO_PORT);
- /* request_region(io, 2, "pc87413"); */
+ if (!request_muxed_region(io, 2, MODNAME))
+ return -EBUSY;
ret = register_reboot_notifier(&pc87413_notifier);
if (ret != 0) {
@@ -541,12 +525,32 @@ static int __init pc87413_init(void)
printk(KERN_ERR PFX
"cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
- unregister_reboot_notifier(&pc87413_notifier);
- return ret;
+ goto reboot_unreg;
}
printk(KERN_INFO PFX "initialized. timeout=%d min \n", timeout);
+
+ pc87413_select_wdt_out();
+ pc87413_enable_swc();
+ pc87413_get_swc_base_addr();
+
+ if (!request_region(swc_base_addr, 0x20, MODNAME)) {
+ printk(KERN_ERR PFX
+ "cannot request SWC region at 0x%x\n", swc_base_addr);
+ ret = -EBUSY;
+ goto misc_unreg;
+ }
+
pc87413_enable();
+
+ release_region(io, 2);
return 0;
+
+misc_unreg:
+ misc_deregister(&pc87413_miscdev);
+reboot_unreg:
+ unregister_reboot_notifier(&pc87413_notifier);
+ release_region(io, 2);
+ return ret;
}
/**
@@ -569,7 +573,7 @@ static void __exit pc87413_exit(void)
misc_deregister(&pc87413_miscdev);
unregister_reboot_notifier(&pc87413_notifier);
- /* release_region(io, 2); */
+ release_region(swc_base_addr, 0x20);
printk(KERN_INFO MODNAME " watchdog component driver removed.\n");
}
-------
J.
--
"It only counts as a lie-in if you don't get dressed before tea time."
-- Steve Willison
--
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