[PATCH 2/2] acpi:apd:add AMD ACPI2Platform device support

[Ken Xue <Ken.Xue@amd.com>]

This is a new feature to interpret AMD specific ACPI device to
platform device such as I2C, UART found on AMD CZ and later
chipsets. It based on INTEL LPSS and acpi soc.

Signed-off-by: Ken Xue <Ken.Xue@amd.com>
---
 arch/x86/Kconfig        | 11 +++++++
 drivers/acpi/Makefile   |  2 +-
 drivers/acpi/acpi_apd.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++
 drivers/acpi/internal.h |  6 ++++
 drivers/acpi/scan.c     |  1 +
 5 files changed, 101 insertions(+), 1 deletion(-)
 create mode 100644 drivers/acpi/acpi_apd.c

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ded8a67..6402c79f 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -495,6 +495,17 @@ config X86_INTEL_LPSS
 	  things like clock tree (common clock framework) and pincontrol
 	  which are needed by the LPSS peripheral drivers.
 
+config X86_AMD_PLATFORM_DEVICE
+	bool "AMD ACPI2Platform devices support"
+	depends on ACPI
+	select COMMON_CLK
+	select PINCTRL
+	---help---
+	  Select to interpret AMD specific ACPI device to platform device
+	  such as I2C, UART found on AMD CARRIZO and later chipset. Selecting
+	  this option enables things like clock tree (common clock framework)
+	  and pinctrl.
+
 config IOSF_MBI
 	tristate "Intel SoC IOSF Sideband support for SoC platforms"
 	depends on PCI
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index ae3397d..b07003a 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -40,7 +40,7 @@ acpi-$(CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC) += processor_pdc.o
 acpi-y				+= ec.o
 acpi-$(CONFIG_ACPI_DOCK)	+= dock.o
 acpi-y				+= pci_root.o pci_link.o pci_irq.o
-acpi-y				+= acpi_soc.o acpi_lpss.o
+acpi-y				+= acpi_soc.o acpi_lpss.o acpi_apd.o
 acpi-y				+= acpi_platform.o
 acpi-y				+= acpi_pnp.o
 acpi-y				+= int340x_thermal.o
diff --git a/drivers/acpi/acpi_apd.c b/drivers/acpi/acpi_apd.c
new file mode 100644
index 0000000..9afc144
--- /dev/null
+++ b/drivers/acpi/acpi_apd.c
@@ -0,0 +1,82 @@
+/*
+ * AMD ACPI support for  ACPI2platform device.
+ *
+ * Copyright (c) 2014, AMD Corporation.
+ * Authors: Ken Xue <Ken.Xue@amd.com>
+ *	Wu, Jeff <Jeff.Wu@amd.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/acpi.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#include "internal.h"
+#include "acpi_soc.h"
+
+struct acpi_soc asoc;
+
+#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
+#define APD_ADDR(desc)	((unsigned long)&desc)
+
+static int acpi_apd_setup(struct acpi_soc_dev_private_data *pdata)
+{
+	struct acpi_soc_dev_desc *dev_desc = pdata->dev_desc;
+	struct clk *clk = ERR_PTR(-ENODEV);
+
+	if (dev_desc->clk)
+		return 0;
+
+	if (dev_desc->fixed_clk_rate) {
+		clk = clk_register_fixed_rate(&pdata->adev->dev,
+					dev_name(&pdata->adev->dev),
+					NULL, CLK_IS_ROOT,
+					dev_desc->fixed_clk_rate);
+		dev_desc->clk = clk;
+		clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
+	}
+
+	return 0;
+}
+
+static struct acpi_soc_dev_desc cz_i2c_desc = {
+	.setup = acpi_apd_setup,
+	.fixed_clk_rate = 133000000,
+};
+
+static struct acpi_soc_dev_desc cz_uart_desc = {
+	.setup = acpi_apd_setup,
+	.fixed_clk_rate = 48000000,
+};
+
+#else
+
+#define APD_ADDR(desc) (0UL)
+
+#endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
+
+static struct acpi_device_id acpi_apd_device_ids[] = {
+	/* Generic apd devices */
+	{ "AMD0010", APD_ADDR(cz_i2c_desc) },
+	{ "AMD0020", APD_ADDR(cz_uart_desc) },
+	{ }
+};
+
+
+void __init acpi_apd_init(void)
+{
+	asoc.ids = acpi_apd_device_ids;
+#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
+	register_acpi_soc(&asoc, false);
+#else
+	register_acpi_soc(&asoc, true);
+#endif /*CONFIG_X86_AMD_PLATFORM_DEVICE*/
+}
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 447f6d6..c8a0e8e 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -68,6 +68,12 @@ static inline void acpi_debugfs_init(void) { return; }
 #endif
 void acpi_lpss_init(void);
 
+#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
+void acpi_apd_init(void);
+#else
+static inline void acpi_apd_init(void) {}
+#endif
+
 acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src);
 bool acpi_queue_hotplug_work(struct work_struct *work);
 void acpi_device_hotplug(struct acpi_device *adev, u32 src);
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 0476e90..24fef2b 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -2349,6 +2349,7 @@ int __init acpi_scan_init(void)
 	acpi_pci_link_init();
 	acpi_processor_init();
 	acpi_lpss_init();
+	acpi_apd_init();
 	acpi_cmos_rtc_init();
 	acpi_container_init();
 	acpi_memory_hotplug_init();
-- 
1.9.1