x86: ivybridge: Move northbridge and PCH init into drivers

Instead of calling the northbridge and PCH init from bd82x6x_init_extra()
when the PCI bus is probed, call it from the respective drivers. Also drop
the Northbridge init as it has no effect. The registers it touches appear to
be read-only.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

arch/x86/cpu/ivybridge/bd82x6x.c

@@ -18,45 +18,6 @@
 
 #define BIOS_CTRL	0xdc
 
-void bd82x6x_pci_init(pci_dev_t dev)
-{
-	u16 reg16;
-	u8 reg8;
-
-	debug("bd82x6x PCI init.\n");
-	/* Enable Bus Master */
-	reg16 = x86_pci_read_config16(dev, PCI_COMMAND);
-	reg16 |= PCI_COMMAND_MASTER;
-	x86_pci_write_config16(dev, PCI_COMMAND, reg16);
-
-	/* This device has no interrupt */
-	x86_pci_write_config8(dev, INTR, 0xff);
-
-	/* disable parity error response and SERR */
-	reg16 = x86_pci_read_config16(dev, BCTRL);
-	reg16 &= ~(1 << 0);
-	reg16 &= ~(1 << 1);
-	x86_pci_write_config16(dev, BCTRL, reg16);
-
-	/* Master Latency Count must be set to 0x04! */
-	reg8 = x86_pci_read_config8(dev, SMLT);
-	reg8 &= 0x07;
-	reg8 |= (0x04 << 3);
-	x86_pci_write_config8(dev, SMLT, reg8);
-
-	/* Will this improve throughput of bus masters? */
-	x86_pci_write_config8(dev, PCI_MIN_GNT, 0x06);
-
-	/* Clear errors in status registers */
-	reg16 = x86_pci_read_config16(dev, PSTS);
-	/* reg16 |= 0xf900; */
-	x86_pci_write_config16(dev, PSTS, reg16);
-
-	reg16 = x86_pci_read_config16(dev, SECSTS);
-	/* reg16 |= 0xf900; */
-	x86_pci_write_config16(dev, SECSTS, reg16);
-}
-
 static int bd82x6x_probe(struct udevice *dev)
 {
 	const void *blob = gd->fdt_blob;
@@ -108,10 +69,7 @@ int bd82x6x_init_extra(void)
 		return -EINVAL;
 	}
 
-	bd82x6x_pci_init(PCH_DEV);
 	bd82x6x_sata_enable(PCH_SATA_DEV, blob, sata_node);
-	northbridge_enable(PCH_DEV);
-	northbridge_init(PCH_DEV);
 
 	return 0;
 }

arch/x86/cpu/ivybridge/northbridge.c

@@ -197,15 +197,12 @@ static void sandybridge_setup_northbridge_bars(struct udevice *dev)
 	dm_pci_write_config8(dev, PAM6, 0x33);
 }
 
-static int bd82x6x_northbridge_probe(struct udevice *dev)
+static int bd82x6x_northbridge_early_init(struct udevice *dev)
 {
 	const int chipset_type = SANDYBRIDGE_MOBILE;
 	u32 capid0_a;
 	u8 reg8;
 
-	if (gd->flags & GD_FLG_RELOC)
-		return 0;
-
 	/* Device ID Override Enable should be done very early */
 	dm_pci_read_config32(dev, 0xe4, &capid0_a);
 	if (capid0_a & (1 << 10)) {
@@ -226,6 +223,17 @@ static int bd82x6x_northbridge_probe(struct udevice *dev)
 	return 0;
 }
 
+static int bd82x6x_northbridge_probe(struct udevice *dev)
+{
+	if (!(gd->flags & GD_FLG_RELOC))
+		return bd82x6x_northbridge_early_init(dev);
+
+	northbridge_enable(PCH_DEV);
+	northbridge_init(PCH_DEV);
+
+	return 0;
+}
+
 static const struct udevice_id bd82x6x_northbridge_ids[] = {
 	{ .compatible = "intel,bd82x6x-northbridge" },
 	{ }

arch/x86/include/asm/arch-ivybridge/bd82x6x.h

@@ -9,7 +9,6 @@
 
 void bd82x6x_sata_init(pci_dev_t dev, const void *blob, int node);
 void bd82x6x_sata_enable(pci_dev_t dev, const void *blob, int node);
-void bd82x6x_pci_init(pci_dev_t dev);
 void bd82x6x_usb_ehci_init(pci_dev_t dev);
 void bd82x6x_usb_xhci_init(pci_dev_t dev);
 int gma_func0_init(struct udevice *dev, const void *blob, int node);

board/google/chromebook_link/link.c

@@ -14,14 +14,6 @@
 
 int arch_early_init_r(void)
 {
-	struct udevice *dev;
-	int ret;
-
-	/* Make sure the platform controller hub is up and running */
-	ret = uclass_get_device(UCLASS_PCH, 0, &dev);
-	if (ret)
-		return ret;
-
 	return 0;
 }