x86: qemu: Enable legacy IDE I/O ports decode
QEMU always decode legacy IDE I/O ports on PIIX chipset. However Linux ata_piix
driver does sanity check to see whether legacy ports decode is turned on.
To make Linux ata_piix driver happy, turn on the decode via IDE_TIMING register.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/include/asm/arch-qemu/qemu.h b/arch/x86/include/asm/arch-qemu/qemu.h
index 7a9901d..5cbffff 100644
--- a/arch/x86/include/asm/arch-qemu/qemu.h
+++ b/arch/x86/include/asm/arch-qemu/qemu.h
@@ -13,6 +13,11 @@
#define PAM_NUM 7
#define PAM_RW 0x33
+/* IDE Timing Register */
+#define IDE0_TIM 0x40
+#define IDE1_TIM 0x42
+#define IDE_DECODE_EN 0x8000
+
/* I/O Ports */
#define CMOS_ADDR_PORT 0x70
#define CMOS_DATA_PORT 0x71