x86: baytrail: Introduce ACPI global NVS

This introduces baytrail-specific ACPI global NVS structure, defined in
both C header file and ASL file.

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

diff --git a/arch/x86/cpu/baytrail/acpi.c b/arch/x86/cpu/baytrail/acpi.c
index 5ee4868..fa92d88 100644 (file)
--- a/arch/x86/cpu/baytrail/acpi.c
+++ b/arch/x86/cpu/baytrail/acpi.c
@@ -5,10 +5,14 @@
  */
 
 #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>
 #include <asm/arch/iomap.h>
 
 void acpi_create_fadt(struct acpi_fadt *fadt, struct acpi_facs *facs,
@@ -161,3 +165,25 @@ u32 acpi_fill_madt(u32 current)
 
        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;
+       }
+
+       /* determine whether internal uart is on */
+       if (IS_ENABLED(CONFIG_INTERNAL_UART))
+               gnvs->iuart_en = 1;
+       else
+               gnvs->iuart_en = 0;
+}

diff --git a/arch/x86/include/asm/acpi/global_nvs.h b/arch/x86/include/asm/acpi/global_nvs.h
new file mode 100644 (file)
index 0000000..7f2ffd4
--- /dev/null
+++ b/arch/x86/include/asm/acpi/global_nvs.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2016, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#ifndef _ACPI_GNVS_H_
+#define _ACPI_GNVS_H_
+
+/*
+ * This file provides two ACPI global NVS macros: ACPI_GNVS_ADDR and
+ * ACPI_GNVS_SIZE. They are to be used in platform's global_nvs.asl file
+ * to declare the GNVS OperationRegion, as well as write_acpi_tables()
+ * for the GNVS address runtime fix up.
+ */
+#define ACPI_GNVS_ADDR 0xdeadbeef
+#define ACPI_GNVS_SIZE 0x100
+
+#endif /* _ACPI_GNVS_H_ */

diff --git a/arch/x86/include/asm/arch-baytrail/acpi/global_nvs.asl b/arch/x86/include/asm/arch-baytrail/acpi/global_nvs.asl
new file mode 100644 (file)
index 0000000..a28d4df
--- /dev/null
+++ b/arch/x86/include/asm/arch-baytrail/acpi/global_nvs.asl
@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) 2016 Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <asm/acpi/global_nvs.h>
+
+OperationRegion(GNVS, SystemMemory, ACPI_GNVS_ADDR, ACPI_GNVS_SIZE)
+Field(GNVS, ByteAcc, NoLock, Preserve)
+{
+       Offset (0x00),
+       PCNT, 8,        /* processor count */
+       IURE, 8,        /* internal UART enabled */
+}

diff --git a/arch/x86/include/asm/arch-baytrail/global_nvs.h b/arch/x86/include/asm/arch-baytrail/global_nvs.h
new file mode 100644 (file)
index 0000000..56e3626
--- /dev/null
+++ b/arch/x86/include/asm/arch-baytrail/global_nvs.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2016, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#ifndef _GLOBAL_NVS_H_
+#define _GLOBAL_NVS_H_
+
+struct __packed acpi_global_nvs {
+       u8      pcnt;           /* processor count */
+       u8      iuart_en;       /* internal UART enabled */
+
+       /*
+        * Add padding so sizeof(struct acpi_global_nvs) == 0x100.
+        * This must match the size defined in the global_nvs.asl.
+        */
+       u8      rsvd[254];
+};
+
+#endif /* _GLOBAL_NVS_H_ */