x86: tangier: Enable ACPI support for Intel Tangier

Intel Tangier SoC is a part of Intel Merrifield platform which doesn't
utilize ACPI by default. Here is an attempt to unleash ACPI flexibility
power on Intel Merrifield based platforms.

The change brings minimum support of the devices that found on
Intel Merrifield based end user device.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

2 files changed, 88 insertions, 0 deletions

diff --git a/arch/x86/cpu/tangier/Makefile b/arch/x86/cpu/tangier/Makefile
index d146b3f5c28..92cfa555ed4 100644
--- a/arch/x86/cpu/tangier/Makefile
+++ b/arch/x86/cpu/tangier/Makefile
@@ -5,3 +5,4 @@
 #
 
 obj-y += car.o tangier.o sdram.o
+obj-$(CONFIG_GENERATE_ACPI_TABLE) += acpi.o
diff --git a/arch/x86/cpu/tangier/acpi.c b/arch/x86/cpu/tangier/acpi.c
new file mode 100644
index 00000000000..75e777dcd76
--- /dev/null
+++ b/arch/x86/cpu/tangier/acpi.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2017 Intel Corporation
+ *
+ * Partially based on acpi.c for other x86 platforms
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <cpu.h>
+#include <dm.h>
+#include <dm/uclass-internal.h>
+#include <asm/acpi_table.h>
+#include <asm/ioapic.h>
+#include <asm/mpspec.h>
+#include <asm/tables.h>
+#include <asm/arch/global_nvs.h>
+
+void acpi_create_fadt(struct acpi_fadt *fadt, struct acpi_facs *facs,
+		      void *dsdt)
+{
+	struct acpi_table_header *header = &(fadt->header);
+
+	memset((void *)fadt, 0, sizeof(struct acpi_fadt));
+
+	acpi_fill_header(header, "FACP");
+	header->length = sizeof(struct acpi_fadt);
+	header->revision = 6;
+
+	fadt->firmware_ctrl = (u32)facs;
+	fadt->dsdt = (u32)dsdt;
+	fadt->preferred_pm_profile = ACPI_PM_UNSPECIFIED;
+
+	fadt->iapc_boot_arch = ACPI_FADT_VGA_NOT_PRESENT |
+			       ACPI_FADT_NO_PCIE_ASPM_CONTROL;
+	fadt->flags =
+		ACPI_FADT_WBINVD |
+		ACPI_FADT_POWER_BUTTON | ACPI_FADT_SLEEP_BUTTON |
+		ACPI_FADT_SEALED_CASE | ACPI_FADT_HEADLESS |
+		ACPI_FADT_HW_REDUCED_ACPI;
+
+	fadt->minor_revision = 2;
+
+	fadt->x_firmware_ctl_l = (u32)facs;
+	fadt->x_firmware_ctl_h = 0;
+	fadt->x_dsdt_l = (u32)dsdt;
+	fadt->x_dsdt_h = 0;
+
+	header->checksum = table_compute_checksum(fadt, header->length);
+}
+
+u32 acpi_fill_madt(u32 current)
+{
+	current += acpi_create_madt_lapics(current);
+
+	current += acpi_create_madt_ioapic((struct acpi_madt_ioapic *)current,
+			io_apic_read(IO_APIC_ID) >> 24, IO_APIC_ADDR, 0);
+
+	return current;
+}
+
+u32 acpi_fill_mcfg(u32 current)
+{
+	/* TODO: Derive parameters from SFI MCFG table */
+	current += acpi_create_mcfg_mmconfig
+		((struct acpi_mcfg_mmconfig *)current,
+		0x3f500000, 0x0, 0x0, 0x0);
+
+	return current;
+}
+
+void acpi_create_gnvs(struct acpi_global_nvs *gnvs)
+{
+	struct udevice *dev;
+	int ret;
+
+	/* at least we have one processor */
+	gnvs->pcnt = 1;
+
+	/* override the processor count with actual number */
+	ret = uclass_find_first_device(UCLASS_CPU, &dev);
+	if (ret == 0 && dev != NULL) {
+		ret = cpu_get_count(dev);
+		if (ret > 0)
+			gnvs->pcnt = ret;
+	}
+}