x86: acpi: Move APIs unrelated to ACPI tables generation to a separate library

acpi_find_fadt(), acpi_find_wakeup_vector() and enter_acpi_mode()
are something unrelated to ACPI tables generation. Move these to
a separate library.

This also fixes several style issues reported by checkpatch in the
original codes.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

4 files changed, 111 insertions, 100 deletions

diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
index ba07ac728f..1e8efcc44f 100644
--- a/arch/x86/lib/Makefile
+++ b/arch/x86/lib/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_INTEL_MID) += scu.o
 obj-y	+= sections.o
 obj-y += sfi.o
 obj-y	+= string.o
+obj-y	+= acpi.o
 obj-$(CONFIG_HAVE_ACPI_RESUME) += acpi_s3.o
 ifndef CONFIG_QEMU
 obj-$(CONFIG_GENERATE_ACPI_TABLE) += acpi_table.o
diff --git a/arch/x86/lib/acpi.c b/arch/x86/lib/acpi.c
new file mode 100644
index 0000000000..cba9c24dd4
--- /dev/null
+++ b/arch/x86/lib/acpi.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
+ */
+
+#include <common.h>
+#include <asm/acpi_table.h>
+#include <asm/io.h>
+#include <asm/tables.h>
+
+static struct acpi_rsdp *acpi_valid_rsdp(struct acpi_rsdp *rsdp)
+{
+	if (strncmp((char *)rsdp, RSDP_SIG, sizeof(RSDP_SIG) - 1) != 0)
+		return NULL;
+
+	debug("Looking on %p for valid checksum\n", rsdp);
+
+	if (table_compute_checksum((void *)rsdp, 20) != 0)
+		return NULL;
+	debug("acpi rsdp checksum 1 passed\n");
+
+	if ((rsdp->revision > 1) &&
+	    (table_compute_checksum((void *)rsdp, rsdp->length) != 0))
+		return NULL;
+	debug("acpi rsdp checksum 2 passed\n");
+
+	return rsdp;
+}
+
+struct acpi_fadt *acpi_find_fadt(void)
+{
+	char *p, *end;
+	struct acpi_rsdp *rsdp = NULL;
+	struct acpi_rsdt *rsdt;
+	struct acpi_fadt *fadt = NULL;
+	int i;
+
+	/* Find RSDP */
+	for (p = (char *)ROM_TABLE_ADDR; p < (char *)ROM_TABLE_END; p += 16) {
+		rsdp = acpi_valid_rsdp((struct acpi_rsdp *)p);
+		if (rsdp)
+			break;
+	}
+
+	if (!rsdp)
+		return NULL;
+
+	debug("RSDP found at %p\n", rsdp);
+	rsdt = (struct acpi_rsdt *)(uintptr_t)rsdp->rsdt_address;
+
+	end = (char *)rsdt + rsdt->header.length;
+	debug("RSDT found at %p ends at %p\n", rsdt, end);
+
+	for (i = 0; ((char *)&rsdt->entry[i]) < end; i++) {
+		fadt = (struct acpi_fadt *)(uintptr_t)rsdt->entry[i];
+		if (strncmp((char *)fadt, "FACP", 4) == 0)
+			break;
+		fadt = NULL;
+	}
+
+	if (!fadt)
+		return NULL;
+
+	debug("FADT found at %p\n", fadt);
+	return fadt;
+}
+
+void *acpi_find_wakeup_vector(struct acpi_fadt *fadt)
+{
+	struct acpi_facs *facs;
+	void *wake_vec;
+
+	debug("Trying to find the wakeup vector...\n");
+
+	facs = (struct acpi_facs *)(uintptr_t)fadt->firmware_ctrl;
+
+	if (!facs) {
+		debug("No FACS found, wake up from S3 not possible.\n");
+		return NULL;
+	}
+
+	debug("FACS found at %p\n", facs);
+	wake_vec = (void *)(uintptr_t)facs->firmware_waking_vector;
+	debug("OS waking vector is %p\n", wake_vec);
+
+	return wake_vec;
+}
+
+void enter_acpi_mode(int pm1_cnt)
+{
+	u16 val = inw(pm1_cnt);
+
+	/*
+	 * PM1_CNT register bit0 selects the power management event to be
+	 * either an SCI or SMI interrupt. When this bit is set, then power
+	 * management events will generate an SCI interrupt. When this bit
+	 * is reset power management events will generate an SMI interrupt.
+	 *
+	 * Per ACPI spec, it is the responsibility of the hardware to set
+	 * or reset this bit. OSPM always preserves this bit position.
+	 *
+	 * U-Boot does not support SMI. And we don't have plan to support
+	 * anything running in SMM within U-Boot. To create a legacy-free
+	 * system, and expose ourselves to OSPM as working under ACPI mode
+	 * already, turn this bit on.
+	 */
+	outw(val | PM1_CNT_SCI_EN, pm1_cnt);
+}
diff --git a/arch/x86/lib/acpi_s3.c b/arch/x86/lib/acpi_s3.c
index 514b92ffbd..03917188a9 100644
--- a/arch/x86/lib/acpi_s3.c
+++ b/arch/x86/lib/acpi_s3.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <asm/acpi.h>
 #include <asm/acpi_s3.h>
 #include <asm/acpi_table.h>
 #include <asm/post.h>
diff --git a/arch/x86/lib/acpi_table.c b/arch/x86/lib/acpi_table.c
index 7c4321b5ae..e26c54d187 100644
--- a/arch/x86/lib/acpi_table.c
+++ b/arch/x86/lib/acpi_table.c
@@ -12,8 +12,8 @@
 #include <dm/uclass-internal.h>
 #include <version.h>
 #include <asm/acpi/global_nvs.h>
+#include <asm/acpi.h>
 #include <asm/acpi_table.h>
-#include <asm/io.h>
 #include <asm/ioapic.h>
 #include <asm/lapic.h>
 #include <asm/mpspec.h>
@@ -337,27 +337,6 @@ static void acpi_create_mcfg(struct acpi_mcfg *mcfg)
 	header->checksum = table_compute_checksum((void *)mcfg, header->length);
 }
 
-void enter_acpi_mode(int pm1_cnt)
-{
-	u16 val = inw(pm1_cnt);
-
-	/*
-	 * PM1_CNT register bit0 selects the power management event to be
-	 * either an SCI or SMI interrupt. When this bit is set, then power
-	 * management events will generate an SCI interrupt. When this bit
-	 * is reset power management events will generate an SMI interrupt.
-	 *
-	 * Per ACPI spec, it is the responsibility of the hardware to set
-	 * or reset this bit. OSPM always preserves this bit position.
-	 *
-	 * U-Boot does not support SMI. And we don't have plan to support
-	 * anything running in SMM within U-Boot. To create a legacy-free
-	 * system, and expose ourselves to OSPM as working under ACPI mode
-	 * already, turn this bit on.
-	 */
-	outw(val | PM1_CNT_SCI_EN, pm1_cnt);
-}
-
 /*
  * QEMU's version of write_acpi_tables is defined in drivers/misc/qfw.c
  */
@@ -482,81 +461,3 @@ ulong acpi_get_rsdp_addr(void)
 {
 	return acpi_rsdp_addr;
 }
-
-static struct acpi_rsdp *acpi_valid_rsdp(struct acpi_rsdp *rsdp)
-{
-	if (strncmp((char *)rsdp, RSDP_SIG, sizeof(RSDP_SIG) - 1) != 0)
-		return NULL;
-
-	debug("Looking on %p for valid checksum\n", rsdp);
-
-	if (table_compute_checksum((void *)rsdp, 20) != 0)
-		return NULL;
-	debug("acpi rsdp checksum 1 passed\n");
-
-	if ((rsdp->revision > 1) &&
-	    (table_compute_checksum((void *)rsdp, rsdp->length) != 0))
-		return NULL;
-	debug("acpi rsdp checksum 2 passed\n");
-
-	return rsdp;
-}
-
-struct acpi_fadt *acpi_find_fadt(void)
-{
-	char *p, *end;
-	struct acpi_rsdp *rsdp = NULL;
-	struct acpi_rsdt *rsdt;
-	struct acpi_fadt *fadt = NULL;
-	int i;
-
-	/* Find RSDP */
-	for (p = (char *)ROM_TABLE_ADDR; p < (char *)ROM_TABLE_END; p += 16) {
-		rsdp = acpi_valid_rsdp((struct acpi_rsdp *)p);
-		if (rsdp)
-			break;
-	}
-
-	if (rsdp == NULL)
-		return NULL;
-
-	debug("RSDP found at %p\n", rsdp);
-	rsdt = (struct acpi_rsdt *)rsdp->rsdt_address;
-
-	end = (char *)rsdt + rsdt->header.length;
-	debug("RSDT found at %p ends at %p\n", rsdt, end);
-
-	for (i = 0; ((char *)&rsdt->entry[i]) < end; i++) {
-		fadt = (struct acpi_fadt *)rsdt->entry[i];
-		if (strncmp((char *)fadt, "FACP", 4) == 0)
-			break;
-		fadt = NULL;
-	}
-
-	if (fadt == NULL)
-		return NULL;
-
-	debug("FADT found at %p\n", fadt);
-	return fadt;
-}
-
-void *acpi_find_wakeup_vector(struct acpi_fadt *fadt)
-{
-	struct acpi_facs *facs;
-	void *wake_vec;
-
-	debug("Trying to find the wakeup vector...\n");
-
-	facs = (struct acpi_facs *)fadt->firmware_ctrl;
-
-	if (facs == NULL) {
-		debug("No FACS found, wake up from S3 not possible.\n");
-		return NULL;
-	}
-
-	debug("FACS found at %p\n", facs);
-	wake_vec = (void *)facs->firmware_waking_vector;
-	debug("OS waking vector is %p\n", wake_vec);
-
-	return wake_vec;
-}