1 files changed, 150 insertions, 0 deletions

diff --git a/drivers/acpi/acpi_apd.c b/drivers/acpi/acpi_apd.c
new file mode 100644
index 000000000000..3984ea96e5f7
--- /dev/null
+++ b/drivers/acpi/acpi_apd.c
@@ -0,0 +1,150 @@
+/*
+ * AMD ACPI support for ACPI2platform device.
+ *
+ * Copyright (c) 2014,2015 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/clk-provider.h>
+#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <linux/clkdev.h>
+#include <linux/acpi.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/pm.h>
+
+#include "internal.h"
+
+ACPI_MODULE_NAME("acpi_apd");
+struct apd_private_data;
+
+/**
+ * ACPI_APD_SYSFS : add device attributes in sysfs
+ * ACPI_APD_PM : attach power domain to device
+ */
+#define ACPI_APD_SYSFS  BIT(0)
+#define ACPI_APD_PM     BIT(1)
+
+/**
+ * struct apd_device_desc - a descriptor for apd device
+ * @flags: device flags like %ACPI_APD_SYSFS, %ACPI_APD_PM
+ * @fixed_clk_rate: fixed rate input clock source for acpi device;
+ *                      0 means no fixed rate input clock source
+ * @setup: a hook routine to set device resource during create platform device
+ *
+ * Device description defined as acpi_device_id.driver_data
+ */
+struct apd_device_desc {
+        unsigned int flags;
+        unsigned int fixed_clk_rate;
+        int (*setup)(struct apd_private_data *pdata);
+};
+
+struct apd_private_data {
+        struct clk *clk;
+        struct acpi_device *adev;
+        const struct apd_device_desc *dev_desc;
+};
+
+#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
+#define APD_ADDR(desc)  ((unsigned long)&desc)
+
+static int acpi_apd_setup(struct apd_private_data *pdata)
+{
+        const struct apd_device_desc *dev_desc = pdata->dev_desc;
+        struct clk *clk = ERR_PTR(-ENODEV);
+
+        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);
+                clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
+                pdata->clk = clk;
+        }
+
+        return 0;
+}
+
+static struct apd_device_desc cz_i2c_desc = {
+        .setup = acpi_apd_setup,
+        .fixed_clk_rate = 133000000,
+};
+
+static struct apd_device_desc cz_uart_desc = {
+        .setup = acpi_apd_setup,
+        .fixed_clk_rate = 48000000,
+};
+
+#else
+
+#define APD_ADDR(desc) (0UL)
+
+#endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
+
+/**
+* Create platform device during acpi scan attach handle.
+* Return value > 0 on success of creating device.
+*/
+static int acpi_apd_create_device(struct acpi_device *adev,
+                                   const struct acpi_device_id *id)
+{
+        const struct apd_device_desc *dev_desc = (void *)id->driver_data;
+        struct apd_private_data *pdata;
+        struct platform_device *pdev;
+        int ret;
+
+        if (!dev_desc) {
+                pdev = acpi_create_platform_device(adev);
+                return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
+        }
+
+        pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
+        if (!pdata)
+                return -ENOMEM;
+
+        pdata->adev = adev;
+        pdata->dev_desc = dev_desc;
+
+        if (dev_desc->setup) {
+                ret = dev_desc->setup(pdata);
+                if (ret)
+                        goto err_out;
+        }
+
+        adev->driver_data = pdata;
+        pdev = acpi_create_platform_device(adev);
+        if (!IS_ERR_OR_NULL(pdev))
+                return 1;
+
+        ret = PTR_ERR(pdev);
+        adev->driver_data = NULL;
+
+ err_out:
+        kfree(pdata);
+        return ret;
+}
+
+static const struct acpi_device_id acpi_apd_device_ids[] = {
+        /* Generic apd devices */
+        { "AMD0010", APD_ADDR(cz_i2c_desc) },
+        { "AMD0020", APD_ADDR(cz_uart_desc) },
+        { "AMD0030", },
+        { }
+};
+
+static struct acpi_scan_handler apd_handler = {
+        .ids = acpi_apd_device_ids,
+        .attach = acpi_apd_create_device,
+};
+
+void __init acpi_apd_init(void)
+{
+        acpi_scan_add_handler(&apd_handler);
+}