x86: ivybridge: Use syscon for the GMA device

Until we have a proper video uclass we can use syscon to handle the GMA
device, and avoid the special device tree and PCI searching. Update the code
to work this way.

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

arch/x86/cpu/ivybridge/bd82x6x.c

@@ -9,6 +9,8 @@
 #include <fdtdec.h>
 #include <malloc.h>
 #include <pch.h>
+#include <syscon.h>
+#include <asm/cpu.h>
 #include <asm/io.h>
 #include <asm/lapic.h>
 #include <asm/pci.h>
@@ -149,8 +151,7 @@ void pch_iobp_update(struct udevice *dev, u32 address, u32 andvalue,
 
 static int bd82x6x_probe(struct udevice *dev)
 {
-	const void *blob = gd->fdt_blob;
-	int gma_node;
+	struct udevice *gma_dev;
 	int ret;
 
 	if (!(gd->flags & GD_FLG_RELOC))
@@ -159,15 +160,10 @@ static int bd82x6x_probe(struct udevice *dev)
 	/* Cause the SATA device to do its init */
 	uclass_first_device(UCLASS_DISK, &dev);
 
-	gma_node = fdtdec_next_compatible(blob, 0, COMPAT_INTEL_GMA);
-	if (gma_node < 0) {
-		debug("%s: Cannot find GMA node\n", __func__);
-		return -EINVAL;
-	}
-	ret = dm_pci_bus_find_bdf(PCH_VIDEO_DEV, &dev);
+	ret = syscon_get_by_driver_data(X86_SYSCON_GMA, &gma_dev);
 	if (ret)
 		return ret;
-	ret = gma_func0_init(dev, blob, gma_node);
+	ret = gma_func0_init(gma_dev);
 	if (ret)
 		return ret;
 

arch/x86/cpu/ivybridge/early_me.c

@@ -191,6 +191,7 @@ int intel_early_me_init_done(struct udevice *dev, struct udevice *me_dev,
 
 static const struct udevice_id ivybridge_syscon_ids[] = {
 	{ .compatible = "intel,me", .data = X86_SYSCON_ME },
+	{ .compatible = "intel,gma", .data = X86_SYSCON_GMA },
 	{ }
 };
 

arch/x86/cpu/ivybridge/gma.c

@@ -538,8 +538,10 @@ static int gma_pm_init_pre_vbios(void *gtt_bar, int rev)
 	return 0;
 }
 
-int gma_pm_init_post_vbios(int rev, void *gtt_bar, const void *blob, int node)
+int gma_pm_init_post_vbios(struct udevice *dev, int rev, void *gtt_bar)
 {
+	const void *blob = gd->fdt_blob;
+	int node = dev->of_offset;
 	u32 reg32, cycle_delay;
 
 	debug("GT Power Management Init (post VBIOS)\n");
@@ -794,7 +796,7 @@ void sandybridge_setup_graphics(struct udevice *dev, struct udevice *video_dev)
 	writel(reg32, MCHBAR_REG(0x5418));
 }
 
-int gma_func0_init(struct udevice *dev, const void *blob, int node)
+int gma_func0_init(struct udevice *dev)
 {
 #ifdef CONFIG_VIDEO
 	ulong start;
@@ -839,7 +841,7 @@ int gma_func0_init(struct udevice *dev, const void *blob, int node)
 	debug("BIOS ran in %lums\n", get_timer(start));
 #endif
 	/* Post VBIOS init */
-	ret = gma_pm_init_post_vbios(rev, gtt_bar, blob, node);
+	ret = gma_pm_init_post_vbios(dev, rev, gtt_bar);
 	if (ret)
 		return ret;
 

arch/x86/dts/chromebook_link.dts

@@ -209,7 +209,8 @@
 			u-boot,dm-pre-reloc;
 		};
 
-		gma {
+		gma@2,0 {
+			reg = <0x00001000 0 0 0 0>;
 			compatible = "intel,gma";
 			intel,dp_hotplug = <0 0 0x06>;
 			intel,panel-port-select = <1>;

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

@@ -7,6 +7,6 @@
 #ifndef _ASM_ARCH_BD82X6X_H
 #define _ASM_ARCH_BD82X6X_H
 
-int gma_func0_init(struct udevice *dev, const void *blob, int node);
+int gma_func0_init(struct udevice *dev);
 
 #endif

arch/x86/include/asm/cpu.h

@@ -47,11 +47,13 @@ enum {
 
 /*
  * System controllers in an x86 system. We mostly need to just find these and
- * use them on PCI. At some point these might have their own uclass.
+ * use them on PCI. At some point these might have their own uclass (e.g.
+ * UCLASS_VIDEO for the GMA device).
  */
 enum {
 	X86_NONE,
 	X86_SYSCON_ME,		/* Intel Management Engine */
+	X86_SYSCON_GMA,		/* Intel Graphics Media Accelerator */
 };
 
 struct cpuid_result {