soc/intel/common/block: Add Intel common systemagent support

Add Intel common systemagent support for romstage and ramstage.
Include soc specific macros need to compile systemagent common code.

Change-Id: I969ff187e3d4199864cb2e9c9a13f4d04158e27c
Signed-off-by: V Sowmya <v.sowmya@intel.com>
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/19668
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 134 insertions, 0 deletions

diff --git a/src/soc/intel/common/block/systemagent/systemagent_early.c b/src/soc/intel/common/block/systemagent/systemagent_early.c
new file mode 100644
index 0000000000..7cf78e7352
--- /dev/null
+++ b/src/soc/intel/common/block/systemagent/systemagent_early.c
@@ -0,0 +1,134 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/io.h>
+#include <delay.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <intelblocks/systemagent.h>
+#include <soc/iomap.h>
+#include <soc/pci_devs.h>
+#include <soc/systemagent.h>
+#include "systemagent_def.h"
+#include <timer.h>
+
+#if !ENV_RAMSTAGE
+void bootblock_systemagent_early_init(void)
+{
+	uint32_t reg;
+	uint8_t pciexbar_length;
+
+	/*
+	 * The PCIEXBAR is assumed to live in the memory mapped IO space under
+	 * 4GiB.
+	 */
+	reg = 0;
+	pci_io_write_config32(SA_DEV_ROOT, PCIEXBAR + 4, reg);
+
+	/* Get PCI Express Region Length */
+	switch (CONFIG_SA_PCIEX_LENGTH) {
+	case 256 * MiB:
+		pciexbar_length = PCIEXBAR_LENGTH_256MB;
+		break;
+	case 128 * MiB:
+		pciexbar_length = PCIEXBAR_LENGTH_128MB;
+		break;
+	case 64 * MiB:
+		pciexbar_length = PCIEXBAR_LENGTH_64MB;
+		break;
+	default:
+		pciexbar_length = PCIEXBAR_LENGTH_256MB;
+	}
+	reg = CONFIG_MMCONF_BASE_ADDRESS | (pciexbar_length << 1)
+				| PCIEXBAR_PCIEXBAREN;
+	pci_io_write_config32(SA_DEV_ROOT, PCIEXBAR, reg);
+
+	/*
+	 * TSEG defines the base of SMM range. BIOS determines the base
+	 * of TSEG memory which must be at or below Graphics base of GTT
+	 * Stolen memory, hence its better to clear TSEG register early
+	 * to avoid power on default non-zero value (if any).
+	 */
+	pci_write_config32(SA_DEV_ROOT, TSEG, 0);
+}
+#endif
+
+void sa_set_pci_bar(const struct sa_mmio_descriptor *fixed_set_resources,
+		size_t count)
+{
+	int i;
+
+	for (i = 0; i < count; i++) {
+		uintptr_t base;
+		unsigned int index;
+
+		index = fixed_set_resources[i].index;
+		/* Check if PCI BAR already enabled */
+		base = pci_read_config32(SA_DEV_ROOT, index);
+
+		/* If enabled don't program it. */
+		if (base & 0x1)
+			return;
+
+		base = fixed_set_resources[i].base;
+
+		pci_write_config32(SA_DEV_ROOT, index, base | 1);
+	}
+}
+
+/*
+ * There are special BARs that actually are programmed in the MCHBAR. These
+ * Intel special features, but they do consume resources that need to be
+ * accounted for.
+ */
+void sa_set_mch_bar(const struct sa_mmio_descriptor *fixed_set_resources,
+		size_t count)
+{
+	int i;
+
+	for (i = 0; i < count; i++) {
+		uintptr_t base;
+		unsigned int index;
+
+		base = fixed_set_resources[i].base;
+		index = fixed_set_resources[i].index;
+		write32((void *)(MCH_BASE_ADDRESS + index), base | 1);
+	}
+}
+
+void enable_pam_region(void)
+{
+	/* All read and writes in this region are serviced by DRAM */
+	pci_write_config8(SA_DEV_ROOT, PAM0, 0x30);
+	pci_write_config8(SA_DEV_ROOT, PAM1, 0x33);
+	pci_write_config8(SA_DEV_ROOT, PAM2, 0x33);
+	pci_write_config8(SA_DEV_ROOT, PAM3, 0x33);
+	pci_write_config8(SA_DEV_ROOT, PAM4, 0x33);
+	pci_write_config8(SA_DEV_ROOT, PAM5, 0x33);
+	pci_write_config8(SA_DEV_ROOT, PAM6, 0x33);
+}
+
+void enable_bios_reset_cpl(void)
+{
+	u8 bios_reset_cpl;
+
+	/*
+	 * Set bits 0+1 of BIOS_RESET_CPL to indicate to the CPU
+	 * that BIOS has initialized memory and power management
+	 */
+	bios_reset_cpl = MCHBAR8(BIOS_RESET_CPL);
+	bios_reset_cpl |= 3;
+	MCHBAR8(BIOS_RESET_CPL) = bios_reset_cpl;
+}