1 files changed, 101 insertions, 0 deletions
diff --git a/arch/x86/cpu/qemu/pci.c b/arch/x86/cpu/qemu/pci.c
new file mode 100644
index 0000000..1a9140b
--- /dev/null
+++ b/arch/x86/cpu/qemu/pci.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <pci.h>
+#include <pci_rom.h>
+#include <asm/pci.h>
+#include <asm/arch/device.h>
+#include <asm/arch/qemu.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void board_pci_setup_hose(struct pci_controller *hose)
+{
+	hose->first_busno = 0;
+	hose->last_busno = 0;
+
+	/* PCI memory space */
+	pci_set_region(hose->regions + 0,
+		       CONFIG_PCI_MEM_BUS,
+		       CONFIG_PCI_MEM_PHYS,
+		       CONFIG_PCI_MEM_SIZE,
+		       PCI_REGION_MEM);
+
+	/* PCI IO space */
+	pci_set_region(hose->regions + 1,
+		       CONFIG_PCI_IO_BUS,
+		       CONFIG_PCI_IO_PHYS,
+		       CONFIG_PCI_IO_SIZE,
+		       PCI_REGION_IO);
+
+	pci_set_region(hose->regions + 2,
+		       CONFIG_PCI_PREF_BUS,
+		       CONFIG_PCI_PREF_PHYS,
+		       CONFIG_PCI_PREF_SIZE,
+		       PCI_REGION_PREFETCH);
+
+	pci_set_region(hose->regions + 3,
+		       0,
+		       0,
+		       gd->ram_size,
+		       PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
+
+	hose->region_count = 4;
+}
+
+int board_pci_post_scan(struct pci_controller *hose)
+{
+	int ret = 0;
+	u16 device;
+	int pam, i;
+	pci_dev_t vga;
+	ulong start;
+
+	/*
+	 * i440FX and Q35 chipset have different PAM register offset, but with
+	 * the same bitfield layout. Here we determine the offset based on its
+	 * PCI device ID.
+	 */
+	device = x86_pci_read_config16(PCI_BDF(0, 0, 0), PCI_DEVICE_ID);
+	pam = (device == PCI_DEVICE_ID_INTEL_82441) ? I440FX_PAM : Q35_PAM;
+
+	/*
+	 * Initialize Programmable Attribute Map (PAM) Registers
+	 *
+	 * Configure legacy segments C/D/E/F to system RAM
+	 */
+	for (i = 0; i < PAM_NUM; i++)
+		x86_pci_write_config8(PCI_BDF(0, 0, 0), pam + i, PAM_RW);
+
+	if (device == PCI_DEVICE_ID_INTEL_82441) {
+		/*
+		 * Enable legacy IDE I/O ports decode
+		 *
+		 * Note: QEMU always decode legacy IDE I/O port on PIIX chipset.
+		 * However Linux ata_piix driver does sanity check on these two
+		 * registers to see whether legacy ports decode is turned on.
+		 * This is to make Linux ata_piix driver happy.
+		 */
+		x86_pci_write_config16(PIIX_IDE, IDE0_TIM, IDE_DECODE_EN);
+		x86_pci_write_config16(PIIX_IDE, IDE1_TIM, IDE_DECODE_EN);
+	}
+
+	/*
+	 * QEMU emulated graphic card shows in the PCI configuration space with
+	 * PCI vendor id and device id as an artificial pair 0x1234:0x1111.
+	 * It is on PCI bus 0, function 0, but device number is not consistent
+	 * for the two x86 targets it supports. For i440FX and PIIX chipset
+	 * board, it shows as device 2, while for Q35 and ICH9 chipset board,
+	 * it shows as device 1.
+	 */
+	vga = (device == PCI_DEVICE_ID_INTEL_82441) ? I440FX_VGA : Q35_VGA;
+	start = get_timer(0);
+	ret = pci_run_vga_bios(vga, NULL, PCI_ROM_USE_NATIVE);
+	debug("BIOS ran in %lums\n", get_timer(start));
+
+	return ret;
+}