nb/intel/sandybridge: Drop `pci_mmio_size`

There's no good reason to use values smaller than 2 GiB here. Well, it
increases available DRAM in 32-bit space. However, as this is a 64-bit
platform, it's highly unlikely that 32-bit limitations would cause any
issues anymore. It's more likely to have the allocator give up because
memory-mapped resources in 32-bit space don't fit within the specified
MMIO size, which can easily occur when using a discrete graphics card.

Change-Id: If585b6044f58b1e5397457f3bfa906aafc7f9297
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52072
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/stout/devicetree.cb

@@ -33,8 +33,6 @@ chip northbridge/intel/sandybridge
 		end
 	end
 
-	register "pci_mmio_size" = "1024"
-
 	device domain 0 on
 		subsystemid 0x1ae0 0xc000 inherit
 		device pci 00.0 on end # host bridge

src/mainboard/lenovo/x131e/devicetree.cb

@@ -26,8 +26,6 @@ chip northbridge/intel/sandybridge
 		end
 	end
 
-	register "pci_mmio_size" = "1024"
-
 	device domain 0x0 on
 		subsystemid 0x17aa 0x21fe inherit
 

src/mainboard/lenovo/x1_carbon_gen1/devicetree.cb

@@ -24,8 +24,6 @@ chip northbridge/intel/sandybridge
 		end
 	end
 
-	register "pci_mmio_size" = "1024"
-
 	device domain 0 on
 		subsystemid 0x17aa 0x21f9 inherit
 

src/mainboard/lenovo/x230/devicetree.cb

@@ -27,8 +27,6 @@ chip northbridge/intel/sandybridge
 		end
 	end
 
-	register "pci_mmio_size" = "1024"
-
 	device domain 0 on
 		subsystemid 0x17aa 0x21fa inherit
 

src/mainboard/samsung/lumpy/devicetree.cb

@@ -31,8 +31,6 @@ chip northbridge/intel/sandybridge
 		end
 	end
 
-	register "pci_mmio_size" = "1024"
-
 	device domain 0 on
 		ioapic_irq 4 INTA 0x10
 		ioapic_irq 4 INTB 0x11

src/mainboard/samsung/stumpy/devicetree.cb

@@ -23,8 +23,6 @@ chip northbridge/intel/sandybridge
 		end
 	end
 
-	register "pci_mmio_size" = "1024"
-
 	device domain 0 on
 		subsystemid 0x1ae0 0xc000 inherit
 		device pci 00.0 on end # host bridge

src/northbridge/intel/sandybridge/chip.h

@@ -43,11 +43,6 @@ struct northbridge_intel_sandybridge_config {
 
 	struct i915_gpu_controller_info gfx;
 
-	/*
-	 * Maximum PCI MMIO size in MiB.
-	 */
-	u16 pci_mmio_size;
-
 	/* Data for RAM init */
 
 	/* DIMM SPD address. Use 8bit notation where BIT0 is always zero. */

src/northbridge/intel/sandybridge/raminit_common.c

@@ -338,24 +338,6 @@ void dram_zones(ramctr_timing *ctrl, int training)
 	}
 }
 
-#define DEFAULT_PCI_MMIO_SIZE 2048
-
-static unsigned int get_mmio_size(void)
-{
-	const struct device *dev;
-	const struct northbridge_intel_sandybridge_config *cfg = NULL;
-
-	dev = pcidev_path_on_root(PCI_DEVFN(0, 0));
-	if (dev)
-		cfg = dev->chip_info;
-
-	/* If this is zero, it just means devicetree.cb didn't set it */
-	if (!cfg || cfg->pci_mmio_size == 0)
-		return DEFAULT_PCI_MMIO_SIZE;
-	else
-		return cfg->pci_mmio_size;
-}
-
 /*
  * Returns the ECC mode the NB is running at. It takes precedence over ECC capability.
  * The ME/PCU/.. has the ability to change this.
@@ -382,6 +364,8 @@ bool get_host_ecc_cap(void)
 	return !(reg32 & (1 << 25));
 }
 
+#define DEFAULT_PCI_MMIO_SIZE 2048
+
 void dram_memorymap(ramctr_timing *ctrl, int me_uma_size)
 {
 	u32 reg, val, reclaim, tom, gfxstolen, gttsize;
@@ -389,7 +373,7 @@ void dram_memorymap(ramctr_timing *ctrl, int me_uma_size)
 	size_t tsegsize, touudbase, remaplimit, mestolenbase, tsegbasedelta;
 	uint16_t ggc;
 
-	mmiosize = get_mmio_size();
+	mmiosize = DEFAULT_PCI_MMIO_SIZE;
 
 	ggc = pci_read_config16(HOST_BRIDGE, GGC);
 	if (!(ggc & 2)) {