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Message-Id: <20170403075133.12343-4-zboszor@pr.hu>
Date: Mon, 3 Apr 2017 09:51:33 +0200
From: Zoltan Boszormenyi <zboszor@...hu>
To: linux-usb@...r.kernel.org, linux-watchdog@...r.kernel.org,
linux-i2c@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
Paul Menzel <paulepanter@...rs.sourceforge.net>,
Christian Fetzer <fetzer.ch@...il.com>,
Jean Delvare <jdelvare@...e.com>,
Nehal Shah <nehal-bakulchandra.shah@....com>,
Tim Small <tim@...ss.co.uk>,
Guenter Roeck <linux@...ck-us.net>,
Zoltan Boszormenyi <zboszor@...hu>
Subject: [PATCH 3/3 v2] watchdog: sp5100_tco: Use the common mutex
Use the common mutex from usb/host/pci-quirks.c to synchronize
accesses to the SB800 I/O port pair (0xcd6 / 0xcd7) with the
PCI quirk for isochronous USB transfers and with the i2c-piix4
driver.
At the same time, remove the request_region() call to reserve
these I/O ports, similarly to i2c-piix4 so the code is now uniform
across the three individual drivers.
v2: Explicit extern reference for sb800_mutex
Signed-off-by: Zoltan Boszormenyi <zboszor@...hu>
---
drivers/watchdog/sp5100_tco.c | 31 ++++++++++++++++++-------------
1 file changed, 18 insertions(+), 13 deletions(-)
diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c
index 028618c..4dca9e89 100644
--- a/drivers/watchdog/sp5100_tco.c
+++ b/drivers/watchdog/sp5100_tco.c
@@ -36,9 +36,16 @@
#include <linux/platform_device.h>
#include <linux/uaccess.h>
#include <linux/io.h>
+#include <linux/mutex.h>
#include "sp5100_tco.h"
+/*
+ * sb800_mutex in drivers/usb/host/pci-quirks.c protects
+ * parallel access to the I/O port pair 0xCD6 / 0xCD7.
+ */
+extern struct mutex sb800_mutex;
+
/* Module and version information */
#define TCO_VERSION "0.05"
#define TCO_MODULE_NAME "SP5100 TCO timer"
@@ -48,7 +55,6 @@
static u32 tcobase_phys;
static u32 tco_wdt_fired;
static void __iomem *tcobase;
-static unsigned int pm_iobase;
static DEFINE_SPINLOCK(tco_lock); /* Guards the hardware */
static unsigned long timer_alive;
static char tco_expect_close;
@@ -138,6 +144,8 @@ static void tco_timer_enable(void)
if (!tco_has_sp5100_reg_layout(sp5100_tco_pci)) {
/* For SB800 or later */
+ mutex_lock(&sb800_mutex);
+
/* Set the Watchdog timer resolution to 1 sec */
outb(SB800_PM_WATCHDOG_CONFIG, SB800_IO_PM_INDEX_REG);
val = inb(SB800_IO_PM_DATA_REG);
@@ -150,6 +158,8 @@ static void tco_timer_enable(void)
val |= SB800_PCI_WATCHDOG_DECODE_EN;
val &= ~SB800_PM_WATCHDOG_DISABLE;
outb(val, SB800_IO_PM_DATA_REG);
+
+ mutex_unlock(&sb800_mutex);
} else {
/* For SP5100 or SB7x0 */
/* Enable watchdog decode bit */
@@ -164,11 +174,13 @@ static void tco_timer_enable(void)
val);
/* Enable Watchdog timer and set the resolution to 1 sec */
+ mutex_lock(&sb800_mutex);
outb(SP5100_PM_WATCHDOG_CONTROL, SP5100_IO_PM_INDEX_REG);
val = inb(SP5100_IO_PM_DATA_REG);
val |= SP5100_PM_WATCHDOG_SECOND_RES;
val &= ~SP5100_PM_WATCHDOG_DISABLE;
outb(val, SP5100_IO_PM_DATA_REG);
+ mutex_unlock(&sb800_mutex);
}
}
@@ -361,16 +373,10 @@ static unsigned char sp5100_tco_setupdevice(void)
base_addr = SB800_PM_WATCHDOG_BASE;
}
- /* Request the IO ports used by this driver */
- pm_iobase = SP5100_IO_PM_INDEX_REG;
- if (!request_region(pm_iobase, SP5100_PM_IOPORTS_SIZE, dev_name)) {
- pr_err("I/O address 0x%04x already in use\n", pm_iobase);
- goto exit;
- }
-
/*
* First, Find the watchdog timer MMIO address from indirect I/O.
*/
+ mutex_lock(&sb800_mutex);
outb(base_addr+3, index_reg);
val = inb(data_reg);
outb(base_addr+2, index_reg);
@@ -380,6 +386,7 @@ static unsigned char sp5100_tco_setupdevice(void)
outb(base_addr+0, index_reg);
/* Low three bits of BASE are reserved */
val = val << 8 | (inb(data_reg) & 0xf8);
+ mutex_unlock(&sb800_mutex);
pr_debug("Got 0x%04x from indirect I/O\n", val);
@@ -400,6 +407,7 @@ static unsigned char sp5100_tco_setupdevice(void)
SP5100_SB_RESOURCE_MMIO_BASE, &val);
} else {
/* Read SBResource_MMIO from AcpiMmioEn(PM_Reg: 24h) */
+ mutex_lock(&sb800_mutex);
outb(SB800_PM_ACPI_MMIO_EN+3, SB800_IO_PM_INDEX_REG);
val = inb(SB800_IO_PM_DATA_REG);
outb(SB800_PM_ACPI_MMIO_EN+2, SB800_IO_PM_INDEX_REG);
@@ -408,6 +416,7 @@ static unsigned char sp5100_tco_setupdevice(void)
val = val << 8 | inb(SB800_IO_PM_DATA_REG);
outb(SB800_PM_ACPI_MMIO_EN+0, SB800_IO_PM_INDEX_REG);
val = val << 8 | inb(SB800_IO_PM_DATA_REG);
+ mutex_unlock(&sb800_mutex);
}
/* The SBResource_MMIO is enabled and mapped memory space? */
@@ -429,7 +438,7 @@ static unsigned char sp5100_tco_setupdevice(void)
pr_debug("SBResource_MMIO is disabled(0x%04x)\n", val);
pr_notice("failed to find MMIO address, giving up.\n");
- goto unreg_region;
+ goto exit;
setup_wdt:
tcobase_phys = val;
@@ -469,8 +478,6 @@ static unsigned char sp5100_tco_setupdevice(void)
unreg_mem_region:
release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
-unreg_region:
- release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
exit:
return 0;
}
@@ -517,7 +524,6 @@ static int sp5100_tco_init(struct platform_device *dev)
exit:
iounmap(tcobase);
release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
- release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
return ret;
}
@@ -531,7 +537,6 @@ static void sp5100_tco_cleanup(void)
misc_deregister(&sp5100_tco_miscdev);
iounmap(tcobase);
release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
- release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
}
static int sp5100_tco_remove(struct platform_device *dev)
--
2.9.3
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