x86: qemu: setup PM IO base for ACPI in southbridge

Enable ACPI IO space for piix4 (for pc board) and ich9 (for q35 board)

Signed-off-by: Miao Yan <yanmiaobest@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>

arch/x86/cpu/qemu/Kconfig

@@ -17,4 +17,11 @@ config SYS_CAR_SIZE
 	hex
 	default 0x10000
 
+config ACPI_PM1_BASE
+	hex
+	default 0xe400
+	help
+	  ACPI Power Managment 1 (PM1) i/o-mapped base address.
+	  This device is defined in ACPI specification, with 16 bytes in size.
+
 endif

arch/x86/cpu/qemu/qemu.c

@@ -15,6 +15,31 @@
 
 static bool i440fx;
 
+static void enable_pm_piix(void)
+{
+	u8 en;
+	u16 cmd;
+
+	/* Set the PM I/O base */
+	x86_pci_write_config32(PIIX_PM, PMBA, CONFIG_ACPI_PM1_BASE | 1);
+
+	/* Enable access to the PM I/O space */
+	cmd = x86_pci_read_config16(PIIX_PM, PCI_COMMAND);
+	cmd |= PCI_COMMAND_IO;
+	x86_pci_write_config16(PIIX_PM, PCI_COMMAND, cmd);
+
+	/* PM I/O Space Enable (PMIOSE) */
+	en = x86_pci_read_config8(PIIX_PM, PMREGMISC);
+	en |= PMIOSE;
+	x86_pci_write_config8(PIIX_PM, PMREGMISC, en);
+}
+
+static void enable_pm_ich9(void)
+{
+	/* Set the PM I/O base */
+	x86_pci_write_config32(ICH9_PM, PMBA, CONFIG_ACPI_PM1_BASE | 1);
+}
+
 static void qemu_chipset_init(void)
 {
 	u16 device, xbcs;
@@ -53,10 +78,14 @@ static void qemu_chipset_init(void)
 		xbcs = x86_pci_read_config16(PIIX_ISA, XBCS);
 		xbcs |= APIC_EN;
 		x86_pci_write_config16(PIIX_ISA, XBCS, xbcs);
+
+		enable_pm_piix();
 	} else {
 		/* Configure PCIe ECAM base address */
 		x86_pci_write_config32(PCI_BDF(0, 0, 0), PCIEX_BAR,
 				       CONFIG_PCIE_ECAM_BASE | BAR_EN);
+
+		enable_pm_ich9();
 	}
 
 	qemu_fwcfg_init();

arch/x86/include/asm/arch-qemu/device.h

@@ -13,6 +13,8 @@
 #define PIIX_ISA	PCI_BDF(0, 1, 0)
 #define PIIX_IDE	PCI_BDF(0, 1, 1)
 #define PIIX_USB	PCI_BDF(0, 1, 2)
+#define PIIX_PM	PCI_BDF(0, 1, 3)
+#define ICH9_PM	PCI_BDF(0, 0x1f, 0)
 #define I440FX_VGA	PCI_BDF(0, 2, 0)
 
 #define QEMU_Q35	PCI_BDF(0, 0, 0)

arch/x86/include/asm/arch-qemu/qemu.h

@@ -33,4 +33,9 @@
 #define LOW_RAM_ADDR		0x34
 #define HIGH_RAM_ADDR		0x35
 
+/* PM registers */
+#define PMBA		0x40
+#define PMREGMISC	0x80
+#define PMIOSE		(1 << 0)
+
 #endif /* _ARCH_QEMU_H_ */