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>

diff --git a/drivers/acpi/atomicio.c b/drivers/acpi/atomicio.c
index cfc0cc1..1016f18 100644 (file)
--- 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;
        }