summaryrefslogtreecommitdiff
path: root/drivers/watchdog/sp5100_tco.c
diff options
context:
space:
mode:
authorTakahisa Tanaka <mc74hc00@gmail.com>2013-01-14 11:01:58 +0900
committerWim Van Sebroeck <wim@iguana.be>2013-03-01 12:19:35 +0100
commit41adafbd7b84c66c2cdad857b75d5d45032310a6 (patch)
tree8b38fb0f4b675d359f5e19b5622b89affa00128f /drivers/watchdog/sp5100_tco.c
parent10ab329b5db7e592a3a60b4594e4e5f40b60c45c (diff)
watchdog: sp5100_tco: Write back the original value to reserved bits, instead of zero
In case of SP5100 or SB7x0 chipsets, the sp5100_tco module writes zero to reserved bits. The module, however, shouldn't depend on specific default value, and should perform a read-merge-write operation for the reserved bits. This patch makes the sp5100_tco module perform a read-merge-write operation on all the chipset (sp5100, sb7x0, sb8x0 or later). Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=43176 Signed-off-by: Takahisa Tanaka <mc74hc00@gmail.com> Tested-by: Paul Menzel <paulepanter@users.sourceforge.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be> Cc: stable <stable@vger.kernel.org>
Diffstat (limited to 'drivers/watchdog/sp5100_tco.c')
-rw-r--r--drivers/watchdog/sp5100_tco.c28
1 files changed, 8 insertions, 20 deletions
diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c
index 5dfe86ebdc8b..e3b8f757d2d3 100644
--- a/drivers/watchdog/sp5100_tco.c
+++ b/drivers/watchdog/sp5100_tco.c
@@ -361,7 +361,7 @@ static unsigned char sp5100_tco_setupdevice(void)
{
struct pci_dev *dev = NULL;
const char *dev_name = NULL;
- u32 val;
+ u32 val, tmp_val;
u32 index_reg, data_reg, base_addr;
/* Match the PCI device */
@@ -497,31 +497,19 @@ static unsigned char sp5100_tco_setupdevice(void)
pr_debug("Got 0x%04x from resource tree\n", val);
}
- /* Restore to the low three bits, if chipset is SB8x0(or later) */
- if (sp5100_tco_pci->revision >= 0x40) {
- u8 reserved_bit;
- outb(base_addr+0, index_reg);
- reserved_bit = inb(data_reg) & 0x7;
- val |= (u32)reserved_bit;
- }
+ /* Restore to the low three bits */
+ outb(base_addr+0, index_reg);
+ tmp_val = val | (inb(data_reg) & 0x7);
/* Re-programming the watchdog timer base address */
outb(base_addr+0, index_reg);
- /* Low three bits of BASE are reserved */
- outb((val >> 0) & 0xff, data_reg);
+ outb((tmp_val >> 0) & 0xff, data_reg);
outb(base_addr+1, index_reg);
- outb((val >> 8) & 0xff, data_reg);
+ outb((tmp_val >> 8) & 0xff, data_reg);
outb(base_addr+2, index_reg);
- outb((val >> 16) & 0xff, data_reg);
+ outb((tmp_val >> 16) & 0xff, data_reg);
outb(base_addr+3, index_reg);
- outb((val >> 24) & 0xff, data_reg);
-
- /*
- * Clear unnecessary the low three bits,
- * if chipset is SB8x0(or later)
- */
- if (sp5100_tco_pci->revision >= 0x40)
- val &= ~0x7;
+ outb((tmp_val >> 24) & 0xff, data_reg);
if (!request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
dev_name)) {