Message-ID: <1418892285.17614.6.camel@kxue-X58A-UD3R>
Date:	Thu, 18 Dec 2014 16:44:45 +0800
From:	Ken Xue <Ken.Xue@....com>
To:	<andy.shevchenko@...il.com>, <mika.westerberg@...ux.intel.com>,
	<rjw@...ysocki.net>
CC:	<linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/3 V3] acpi:soc: merge common codes for creating platform
 device


This patch is supposed to deliver some common codes for AMD APD and
intel LPSS. It can help to convert some specific acpi devices to be
platform devices.

Signed-off-by: Ken Xue <Ken.Xue@....com>
---
 drivers/acpi/Makefile   |   2 +-
 drivers/acpi/acpi_soc.c | 228 ++++++++++++++++++++++++++++++++++++++++++++++++
 drivers/acpi/acpi_soc.h | 104 ++++++++++++++++++++++
 3 files changed, 333 insertions(+), 1 deletion(-)
 create mode 100644 drivers/acpi/acpi_soc.c
 create mode 100644 drivers/acpi/acpi_soc.h

diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index f74317c..66c7457 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_lpss.o
+acpi-y				+= acpi_soc.o acpi_lpss.o
 acpi-y				+= acpi_platform.o
 acpi-y				+= acpi_pnp.o
 acpi-y				+= int340x_thermal.o
diff --git a/drivers/acpi/acpi_soc.c b/drivers/acpi/acpi_soc.c
new file mode 100644
index 0000000..2abbac9
--- /dev/null
+++ b/drivers/acpi/acpi_soc.c
@@ -0,0 +1,228 @@
+/*
+ * ACPI SOC support for Intel Lynxpoint LPSS and AMD APD.
+ *
+ * Copyright (C) 2013, 2014, Intel Corporation
+ * Copyright (C) 2014, AMD Corporation
+ * Authors: Ken Xue <Ken.Xue@....com>
+ *		Mika Westerberg <mika.westerberg@...ux.intel.com>
+ *		Rafael J. Wysocki <rafael.j.wysocki@...el.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/err.h>
+#include <linux/list.h>
+#include <linux/pm_domain.h>
+#include <linux/platform_device.h>
+
+#include "acpi_soc.h"
+#include "internal.h"
+
+ACPI_MODULE_NAME("acpi_soc");
+
+/* A list for all ACPI SOC device */
+static LIST_HEAD(a_soc_list);
+
+static int is_memory(struct acpi_resource *res, void *not_used)
+{
+	struct resource r;
+
+	return !acpi_dev_resource_memory(res, &r);
+}
+
+static int acpi_soc_create_device(struct acpi_device *adev,
+				   const struct acpi_device_id *id)
+{
+	struct acpi_soc_dev_private_data *pdata;
+	struct acpi_soc_dev_desc *dev_desc;
+	struct resource_list_entry *rentry;
+	struct list_head resource_list;
+	struct platform_device *pdev;
+	int ret;
+
+	dev_desc = (struct acpi_soc_dev_desc *)id->driver_data;
+	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;
+
+	INIT_LIST_HEAD(&resource_list);
+	ret = acpi_dev_get_resources(adev, &resource_list, is_memory, NULL);
+	if (ret < 0)
+		goto err_out;
+
+	list_for_each_entry(rentry, &resource_list, node)
+		if (resource_type(&rentry->res) == IORESOURCE_MEM) {
+			if (dev_desc->mem_size_override)
+				pdata->mmio_size = dev_desc->mem_size_override;
+			else
+				pdata->mmio_size = resource_size(&rentry->res);
+			pdata->mmio_base = ioremap(rentry->res.start,
+						   pdata->mmio_size);
+			break;
+		}
+
+	acpi_dev_free_resource_list(&resource_list);
+
+	pdata->adev = adev;
+	pdata->dev_desc = dev_desc;
+
+	if (dev_desc->setup) {
+		ret = dev_desc->setup(pdata);
+		if (ret)
+			goto err_out;
+	}
+
+	/*
+	 * This works around a known issue in ACPI tables where ACPI SOC devices
+	 * have _PS0 and _PS3 without _PSC (and no power resources), so
+	 * acpi_bus_init_power() will assume that the BIOS has put them into D0.
+	 */
+	ret = acpi_device_fix_up_power(adev);
+	if (ret) {
+		/* Skip the device, but continue the namespace scan. */
+		ret = 0;
+		goto err_out;
+	}
+
+	adev->driver_data = pdata;
+	pdev = acpi_create_platform_device(adev);
+	if (!IS_ERR_OR_NULL(pdev)) {
+		pdata->pdev = pdev;
+		if (dev_desc->post_setup) {
+			ret = dev_desc->post_setup(pdata);
+			if (ret)
+				goto err_out;
+		}
+		return 1;
+	}
+
+	ret = PTR_ERR(pdev);
+	adev->driver_data = NULL;
+
+ err_out:
+	kfree(pdata);
+	return ret;
+}
+
+static int acpi_soc_platform_notify(struct notifier_block *nb,
+				     unsigned long action, void *data)
+{
+	struct platform_device *pdev = to_platform_device(data);
+	struct acpi_soc_dev_private_data *pdata;
+	const struct acpi_device_id *id = NULL;
+	struct acpi_soc *a_soc_entry;
+	struct acpi_device *adev;
+
+	list_for_each_entry(a_soc_entry, &a_soc_list, list) {
+		id = acpi_match_device(a_soc_entry->ids, &pdev->dev);
+		if (id)
+			break;
+	}
+
+	if (!id || !id->driver_data)
+		return 0;
+
+	if (acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev))
+		return 0;
+
+	pdata = acpi_driver_data(adev);
+	if (!pdata || !pdata->mmio_base)
+		return 0;
+
+	switch (action) {
+	case BUS_NOTIFY_ADD_DEVICE:
+		if (pdata->dev_desc->flags & ACPI_SOC_PM) {
+			if (a_soc_entry->pm_domain)
+				pdev->dev.pm_domain = a_soc_entry->pm_domain;
+			else if (pdata->dev_desc->flags & ACPI_SOC_PM_ON)
+				dev_pm_domain_attach(&pdev->dev, true);
+			else
+				dev_pm_domain_attach(&pdev->dev, false);
+		}
+		if ((pdata->dev_desc->flags & ACPI_SOC_SYSFS)
+			&& a_soc_entry->attr_group)
+			sysfs_create_group(&pdev->dev.kobj,
+					  a_soc_entry->attr_group);
+		break;
+	case BUS_NOTIFY_DEL_DEVICE:
+		if ((pdata->dev_desc->flags & ACPI_SOC_SYSFS)
+			&& a_soc_entry->attr_group)
+			sysfs_remove_group(&pdev->dev.kobj,
+					a_soc_entry->attr_group);
+		if (pdata->dev_desc->flags & ACPI_SOC_PM) {
+			if (a_soc_entry->pm_domain)
+				pdev->dev.pm_domain = a_soc_entry->pm_domain;
+			else if (pdata->dev_desc->flags & ACPI_SOC_PM_ON)
+				dev_pm_domain_detach(&pdev->dev, true);
+			else
+				dev_pm_domain_detach(&pdev->dev, false);
+		}
+		break;
+	}
+
+	return 0;
+}
+
+static struct notifier_block acpi_soc_nb = {
+	.notifier_call = acpi_soc_platform_notify,
+};
+
+static void acpi_soc_bind(struct device *dev)
+{
+	struct acpi_soc_dev_private_data *pdata;
+
+	pdata = acpi_driver_data(ACPI_COMPANION(dev));
+
+	if (!pdata || !pdata->dev_desc || !pdata->dev_desc->bind)
+		return;
+
+	pdata->dev_desc->bind(pdata, dev);
+}
+
+static void acpi_soc_unbind(struct device *dev)
+{
+	struct acpi_soc_dev_private_data *pdata;
+
+	pdata = acpi_driver_data(ACPI_COMPANION(dev));
+
+	if (!pdata || !pdata->dev_desc || !pdata->dev_desc->unbind)
+		return;
+
+	pdata->dev_desc->unbind(pdata, dev);
+}
+
+/**
+ * register_acpi_soc - register a new ACPI SOC
+ * @a_soc: ACPI SOC
+ * @disable_scan_handler: true means remove default scan handle
+ *                      false means use default scan handle
+ *
+ * register a new ACPI SOC into asoc_list and install default scan handle.
+ */
+void register_acpi_soc(struct acpi_soc *a_soc, bool disable_scan_handler)
+{
+	struct acpi_scan_handler *acpi_soc_handler;
+	static int init;
+
+	INIT_LIST_HEAD(&a_soc->list);
+	list_add(&a_soc->list, &a_soc_list);
+
+	acpi_soc_handler = kzalloc(sizeof(*acpi_soc_handler), GFP_KERNEL);
+	acpi_soc_handler->ids = a_soc->ids;
+	if (!disable_scan_handler) {
+		acpi_soc_handler->attach = acpi_soc_create_device;
+		acpi_soc_handler->bind = acpi_soc_bind;
+		acpi_soc_handler->unbind = acpi_soc_unbind;
+		if (init == 0) {
+			init++;
+			bus_register_notifier(&platform_bus_type, &acpi_soc_nb);
+		}
+	}
+	acpi_scan_add_handler(acpi_soc_handler);
+}
diff --git a/drivers/acpi/acpi_soc.h b/drivers/acpi/acpi_soc.h
new file mode 100644
index 0000000..39a7f0a
--- /dev/null
+++ b/drivers/acpi/acpi_soc.h
@@ -0,0 +1,104 @@
+/*
+ * ACPI SOC support for Intel Lynxpoint LPSS and AMD APD.
+ *
+ * Copyright (C) 2013,2014 Intel Corporation
+ * Copyright (C) 2014 AMD Corporation
+ * Authors: Ken Xue <Ken.Xue@....com>
+ *		Mika Westerberg <mika.westerberg@...ux.intel.com>
+ *		Rafael J. Wysocki <rafael.j.wysocki@...el.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.
+ */
+#ifndef _ACPI_SOC_H
+#define _ACPI_SOC_H
+
+#include <linux/platform_device.h>
+#include <linux/acpi.h>
+#include <linux/clk.h>
+#include <linux/pm.h>
+
+struct acpi_soc_dev_private_data;
+
+/**
+ * struct acpi_soc - acpi soc
+ * @list: list head
+ * @ids: all acpi device ids for acpi soc
+ * @pm_domain: power domain for all acpi device;can be NULL
+ * @attr_group: attribute group for sysfs support of acpi soc;can be NULL
+ */
+struct acpi_soc {
+	struct list_head	list;
+	struct acpi_device_id	*ids;
+	struct dev_pm_domain	*pm_domain;
+	struct attribute_group	*attr_group;
+};
+
+
+/**
+ * device flags of acpi_soc_dev_desc.
+ * bit 16 to 31 reserved for acpi soc.
+ * bit 0 ~15 reserved for private flags.
+ * ACPI_SOC_SYSFS : add device attributes in sysfs
+ * ACPI_SOC_PM : attach power domain to device
+ * ACPI_SOC_PM_ON : power on device when attach power domain
+ */
+#define ACPI_SOC_SYSFS	BIT(16)
+#define ACPI_SOC_PM	BIT(17)
+#define ACPI_SOC_PM_ON	BIT(18)
+
+/**
+ * struct acpi_soc_dev_desc - a descriptor for acpi device
+ * @flags: device flags like ACPI_SOC_SYSFS ACPI_SOC_PM ACPI_SOC_PM_ON
+ * @clk: clock device
+ * @fixed_clk_rate: fixed rate input clock source for acpi device;
+ *			0 means no fixed rate input clock source
+ * @mem_size_override: a workaround for override device memsize;
+ *			0 means no needs for this WA
+ * @prv_offset: reg offest of lpss features
+ * @setup: a hook routine to set device resource during create platform device
+ * @post_setup: a hook routine after platform device is created
+ * @bind: a hook of acpi_scan_handler.bind
+ * @unbind: a hook of acpi_scan_handler.unbind
+ *
+ * device description defined as acpi_device_id.driver_data
+ */
+struct acpi_soc_dev_desc {
+	unsigned int flags;
+	struct clk *clk;
+	unsigned int fixed_clk_rate;
+	size_t mem_size_override;
+	unsigned int prv_offset;
+	int (*setup)(struct acpi_soc_dev_private_data *pdata);
+	int (*post_setup)(struct acpi_soc_dev_private_data *pdata);
+	void (*bind)(struct acpi_soc_dev_private_data *pdata,
+				struct device *dev);
+	void (*unbind)(struct acpi_soc_dev_private_data *pdata,
+				struct device *dev);
+};
+
+#define ACPI_SOC_REG_CONTEXT_MAX		10
+
+/**
+ * struct acpi_soc_dev_private_data - acpi device private data
+ * @mmio_base: virtual memory base addr of the device
+ * @mmio_size: device memory size
+ * @dev_desc: device description
+ * @pdev: platform device
+ * @adev: acpi device
+ * @prv_reg_ctx: reg context for power management
+ */
+struct acpi_soc_dev_private_data {
+	void __iomem *mmio_base;
+	resource_size_t mmio_size;
+
+	struct acpi_soc_dev_desc *dev_desc;
+	struct platform_device *pdev;
+	struct acpi_device *adev;
+	u32 prv_reg_ctx[ACPI_SOC_REG_CONTEXT_MAX];
+};
+
+void register_acpi_soc(struct acpi_soc *a_soc, bool disable_scan_handler);
+
+#endif
-- 
1.9.1



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