x86: ivybridge: Add support for BD82x6x PCH

Add basic setup for the PCH.

Signed-off-by: Simon Glass <sjg@chromium.org>

3 files changed, 140 insertions, 0 deletions

diff --git a/arch/x86/cpu/ivybridge/Makefile b/arch/x86/cpu/ivybridge/Makefile
index 721b37e..b37fb8f 100644
--- a/arch/x86/cpu/ivybridge/Makefile
+++ b/arch/x86/cpu/ivybridge/Makefile
@@ -4,6 +4,7 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
+obj-y += bd82x6x.o
 obj-y += car.o
 obj-y += cpu.o
 obj-y += early_init.o
diff --git a/arch/x86/cpu/ivybridge/bd82x6x.c b/arch/x86/cpu/ivybridge/bd82x6x.c
new file mode 100644
index 0000000..fab7c53
--- /dev/null
+++ b/arch/x86/cpu/ivybridge/bd82x6x.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <malloc.h>
+#include <asm/lapic.h>
+#include <asm/pci.h>
+#include <asm/arch/bd82x6x.h>
+#include <asm/arch/model_206ax.h>
+#include <asm/arch/pch.h>
+#include <asm/arch/sandybridge.h>
+
+void bd82x6x_pci_init(pci_dev_t dev)
+{
+	u16 reg16;
+	u8 reg8;
+
+	debug("bd82x6x PCI init.\n");
+	/* Enable Bus Master */
+	reg16 = pci_read_config16(dev, PCI_COMMAND);
+	reg16 |= PCI_COMMAND_MASTER;
+	pci_write_config16(dev, PCI_COMMAND, reg16);
+
+	/* This device has no interrupt */
+	pci_write_config8(dev, INTR, 0xff);
+
+	/* disable parity error response and SERR */
+	reg16 = pci_read_config16(dev, BCTRL);
+	reg16 &= ~(1 << 0);
+	reg16 &= ~(1 << 1);
+	pci_write_config16(dev, BCTRL, reg16);
+
+	/* Master Latency Count must be set to 0x04! */
+	reg8 = pci_read_config8(dev, SMLT);
+	reg8 &= 0x07;
+	reg8 |= (0x04 << 3);
+	pci_write_config8(dev, SMLT, reg8);
+
+	/* Will this improve throughput of bus masters? */
+	pci_write_config8(dev, PCI_MIN_GNT, 0x06);
+
+	/* Clear errors in status registers */
+	reg16 = pci_read_config16(dev, PSTS);
+	/* reg16 |= 0xf900; */
+	pci_write_config16(dev, PSTS, reg16);
+
+	reg16 = pci_read_config16(dev, SECSTS);
+	/* reg16 |= 0xf900; */
+	pci_write_config16(dev, SECSTS, reg16);
+}
+
+#define PCI_BRIDGE_UPDATE_COMMAND
+void bd82x6x_pci_dev_enable_resources(pci_dev_t dev)
+{
+	uint16_t command;
+
+	command = pci_read_config16(dev, PCI_COMMAND);
+	command |= PCI_COMMAND_IO;
+#ifdef PCI_BRIDGE_UPDATE_COMMAND
+	/*
+	 * If we write to PCI_COMMAND, on some systems this will cause the
+	 * ROM and APICs to become invisible.
+	 */
+	debug("%x cmd <- %02x\n", dev, command);
+	pci_write_config16(dev, PCI_COMMAND, command);
+#else
+	printf("%s cmd <- %02x (NOT WRITTEN!)\n", dev_path(dev), command);
+#endif
+}
+
+void bd82x6x_pci_bus_enable_resources(pci_dev_t dev)
+{
+	uint16_t ctrl;
+
+	ctrl = pci_read_config16(dev, PCI_BRIDGE_CONTROL);
+	ctrl |= PCI_COMMAND_IO;
+	ctrl |= PCI_BRIDGE_CTL_VGA;
+	debug("%x bridge ctrl <- %04x\n", dev, ctrl);
+	pci_write_config16(dev, PCI_BRIDGE_CONTROL, ctrl);
+
+	bd82x6x_pci_dev_enable_resources(dev);
+}
+
+int bd82x6x_init_pci_devices(void)
+{
+	return 0;
+}
+
+int bd82x6x_init(void)
+{
+	bd82x6x_pci_init(PCH_DEV);
+
+	return 0;
+}
diff --git a/arch/x86/cpu/ivybridge/pci.c b/arch/x86/cpu/ivybridge/pci.c
index c1ae658..452d1c3 100644
--- a/arch/x86/cpu/ivybridge/pci.c
+++ b/arch/x86/cpu/ivybridge/pci.c
@@ -12,6 +12,8 @@
 #include <common.h>
 #include <pci.h>
 #include <asm/pci.h>
+#include <asm/arch/bd82x6x.h>
+#include <asm/arch/pch.h>
 
 static void config_pci_bridge(struct pci_controller *hose, pci_dev_t dev,
 			      struct pci_config_table *table)
@@ -58,3 +60,41 @@ void board_pci_setup_hose(struct pci_controller *hose)
 
 	hose->region_count = 3;
 }
+
+int board_pci_pre_scan(struct pci_controller *hose)
+{
+	pci_dev_t dev;
+	u16 reg16;
+
+	bd82x6x_init();
+
+	reg16 = 0xff;
+	dev = PCH_DEV;
+	reg16 = pci_read_config16(dev, PCI_COMMAND);
+	reg16 |= PCI_COMMAND_SERR | PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
+	pci_write_config16(dev, PCI_COMMAND, reg16);
+
+	/*
+	* Clear non-reserved bits in status register.
+	*/
+	pci_hose_write_config_word(hose, dev, PCI_STATUS, 0xffff);
+	pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);
+	pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE, 0x08);
+
+	pci_write_bar32(hose, dev, 0, 0xf0000000);
+
+	return 0;
+}
+
+int board_pci_post_scan(struct pci_controller *hose)
+{
+	int ret;
+
+	ret = bd82x6x_init_pci_devices();
+	if (ret) {
+		printf("bd82x6x_init_pci_devices() failed: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}