diff options
| author |   Huang Ying <ying.huang@intel.com> | 2011-12-08 11:25:40 +0800 |
|---|---|---|
| committer |   Len Brown <len.brown@intel.com> | 2012-01-17 03:54:15 -0500 |
| commit | 04c25997c97e57d95d1f5a7a6e5fff2411dbd48b (patch) | |
| tree | 9cd7a85d459dcfa56e7a465a556dd813d0cfecc9 /drivers/acpi | |
| parent | Linux 3.2 (diff) | |
| download | linux-dev-04c25997c97e57d95d1f5a7a6e5fff2411dbd48b.tar.xz linux-dev-04c25997c97e57d95d1f5a7a6e5fff2411dbd48b.zip | |
ACPI, Add 64bit read/write support to atomicio on i386
There is no 64bit read/write support in ACPI atomicio because
readq/writeq is used to implement 64bit read/write, but readq/writeq
is not available on i386. This patch implement 64bit read/write
support in atomicio via two readl/writel.
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/atomicio.c | 36 |
1 files changed, 30 insertions, 6 deletions
diff --git a/drivers/acpi/atomicio.c b/drivers/acpi/atomicio.c index cfc0cc10af39..1016f186c17c 100644 --- a/drivers/acpi/atomicio.c +++ b/drivers/acpi/atomicio.c @@ -260,6 +260,21 @@ int acpi_post_unmap_gar(struct acpi_generic_address *reg) } EXPORT_SYMBOL_GPL(acpi_post_unmap_gar); +#ifdef readq +static inline u64 read64(const volatile void __iomem *addr) +{ + return readq(addr); +} +#else +static inline u64 read64(const volatile void __iomem *addr) +{ + u64 l, h; + l = readl(addr); + h = readl(addr+4); + return l | (h << 32); +} +#endif + /* * Can be used in atomic (including NMI) or process context. RCU read * lock can only be released after the IO memory area accessing. @@ -280,11 +295,9 @@ static int acpi_atomic_read_mem(u64 paddr, u64 *val, u32 width) case 32: *val = readl(addr); break; -#ifdef readq case 64: - *val = readq(addr); + *val = read64(addr); break; -#endif default: return -EINVAL; } @@ -293,6 +306,19 @@ static int acpi_atomic_read_mem(u64 paddr, u64 *val, u32 width) return 0; } +#ifdef writeq +static inline void write64(u64 val, volatile void __iomem *addr) +{ + writeq(val, addr); +} +#else +static inline void write64(u64 val, volatile void __iomem *addr) +{ + writel(val, addr); + writel(val>>32, addr+4); +} +#endif + static int acpi_atomic_write_mem(u64 paddr, u64 val, u32 width) { void __iomem *addr; @@ -309,11 +335,9 @@ static int acpi_atomic_write_mem(u64 paddr, u64 val, u32 width) case 32: writel(val, addr); break; -#ifdef writeq case 64: - writeq(val, addr); + write64(val, addr); break; -#endif default: return -EINVAL; } |