Date:	Wed, 26 Nov 2014 18:31:38 +0800
From:	Ken Xue <Ken.Xue@....com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	"lenb@...nel.org" <lenb@...nel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Wu, Jeff" <Jeff.Wu@....com>,
	"Mika Westerberg" <mika.westerberg@...ux.intel.com>,
	Andriy Shevchenko <andriy.shevchenko@...el.com>
Subject: Re: [PATCH] acpi:apd:add AMD ACPI2Platform device support for x86
 system.

On 一, 2014-11-24 at 02:47 +0100, Rafael J. Wysocki wrote:
> On Monday, November 24, 2014 01:02:30 AM Xue, Ken wrote:
> > 
> > On Tuesday, November 18, 2014 01:58:11 PM Ken Xue wrote:
> > > This new feature is to interpret AMD specific ACPI device to platform 
> > > device such as I2C, UART found on AMD CZ and later chipsets. It is 
> > > based on example INTEL LPSS. Now, it can support AMD I2C & UART.
> > > 
> > > Signed-off-by: Ken Xue <Ken.Xue@....com>
> > > Signed-off-by: Jeff Wu <Jeff.Wu@....com>
> > 
> > Generally speaking, this seems to duplicate much code from acpi_lpss which should be re-used instead.  What about moving the code that will be common between acpi_lpss and the new driver into a new file (say acpi_soc.c)?
> > 
> > Also, you need to avoid automatic creation of platform devices when !X86_AMD_PLATFORM_DEVICE in analogy with what acpi_lpss does, or bad things will happen.
> > 
> > [ken] sounds fair enough.  Let me take action to merge drivers to acpi_soc.c ? or you have other plan?
> 
> I'd prefer the common code to reside in one file (or one .c file and one header
> file), and the driver-specific code to stay in separate per-driver files.
> 
[Ken] I wrote a proto type for acpi_soc.c. please help to confirm if it
can match your ideal. if yes, i will submit a new patch after do more
test and refine codes. I think it will impact lpss driver greatly, even
i have taken it into account. below codes is for acpi_soc.c.


>From fc323fb7b3b4cbb79bda05ce3b1d6d8dfe5e883b Mon Sep 17 00:00:00 2001
From: Ken Xue <Ken.Xue@....com>
Date: Wed, 26 Nov 2014 17:15:30 +0800
Subject: [PATCH] This is proto type for acpi_soc.

Signed-off-by: Ken Xue <Ken.Xue@....com>
---
 arch/x86/Kconfig        |  11 +++
 drivers/acpi/Makefile   |   2 +-
 drivers/acpi/acpi_apd.c | 123 ++++++++++++++++++++++++++++
 drivers/acpi/acpi_soc.c | 213
++++++++++++++++++++++++++++++++++++++++++++++++
 drivers/acpi/acpi_soc.h |  91 +++++++++++++++++++++
 drivers/acpi/internal.h |   6 ++
 drivers/acpi/scan.c     |   1 +
 7 files changed, 446 insertions(+), 1 deletion(-)
 create mode 100755 drivers/acpi/acpi_apd.c
 create mode 100755 drivers/acpi/acpi_soc.c
 create mode 100755 drivers/acpi/acpi_soc.h

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 c3b2fcb..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_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 100755
index 0000000..c7e916b
--- /dev/null
+++ b/drivers/acpi/acpi_apd.c
@@ -0,0 +1,123 @@
+/*
+ * AMD ACPI support for  ACPI2platform device.
+ *
+ * Copyright (c) 2014, AMD Corporation.
+ * Authors: Ken Xue <Ken.Xue@....com>
+ *	Wu, Jeff <Jeff.Wu@....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 X86_AMD_PLATFORM_DEVICE
+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->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_INTEL_LPSS */
+
+static struct acpi_device_id acpi_apd_device_ids[] = {
+	/* Generic apd devices */
+	{ "AMD0010", APD_ADDR(cz_i2c_desc) },
+	{ "AMD0020", APD_ADDR(cz_uart_desc) },
+	{ }
+};
+
+#ifdef X86_AMD_PLATFORM_DEVICE
+
+static ssize_t apd_device_desc_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	int ret;
+	struct acpi_device *adev;
+	struct acpi_soc_dev_private_data *pdata;
+	struct acpi_soc_dev_desc *dev_desc;
+
+	ret = acpi_bus_get_device(ACPI_HANDLE(dev), &adev);
+	if (WARN_ON(ret))
+		return ret;
+
+	pdata = acpi_driver_data(adev);
+	if (WARN_ON(!pdata || !pdata->dev_desc))
+		return -ENODEV;
+	
+	dev_desc = pdata->dev_desc;
+	if (dev_desc->fixed_clk_rate)
+		return sprintf(buf, "Required fix rate clk %s: %ld\n",
+			dev_desc->clk->name,
+			dev_desc->fixed_clk_rate);
+	else
+		return sprintf(buf, "No need clk\n");
+}
+
+static DEVICE_ATTR(device_desc, S_IRUSR, apd_device_desc_show, NULL);
+
+static struct attribute *apd_attrs[] = {
+	&dev_attr_device_desc.attr,
+	NULL,
+};
+
+static struct attribute_group apd_attr_group = {
+	.attrs = apd_attrs,
+	.name = "apd",
+};
+
+void __init acpi_apd_init(void)
+{
+	asoc.ids = acpi_apd_device_ids;
+	asoc.attr_group = &apd_attr_group;
+	register_acpi_soc(&asoc, true);
+}
+
+#else
+
+void __init acpi_apd_init(void)
+{
+	asoc.ids = acpi_apd_device_ids;
+	register_acpi_soc(&asoc, false);
+}
+#endif
diff --git a/drivers/acpi/acpi_soc.c b/drivers/acpi/acpi_soc.c
new file mode 100755
index 0000000..99df1ab
--- /dev/null
+++ b/drivers/acpi/acpi_soc.c
@@ -0,0 +1,213 @@
+/*
+ * ACPI SOC support for Intel Lynxpoint LPSS and AMD APD.
+ *
+ * Copyright (C) 2015, Intel Corporation & 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/acpi.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/delay.h>
+#include <linux/pm_domain.h>
+
+#include "internal.h"
+#include "acpi_soc.h"
+
+
+ACPI_MODULE_NAME("acpi_soc");
+
+/*A list for all acpi soc device*/
+static LIST_HEAD(asoc_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_desc *dev_desc;
+	struct acpi_soc_dev_private_data *pdata;
+	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->dev_desc = dev_desc;
+
+	/*setup device by a hook routine*/
+	if (dev_desc->setup)
+		dev_desc->setup(pdata);
+
+	/*
+	 * 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)) {
+		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;
+	struct acpi_device *adev;
+	struct acpi_soc *asoc_entry;
+	const struct acpi_device_id *id = NULL;
+
+	list_for_each_entry(asoc_entry, &asoc_list, list) {
+		id = acpi_match_device(asoc_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_BOUND_DRIVER:
+		if ((pdata->dev_desc->flags & ACPI_SOC_PM)){
+			if (asoc_entry->pm_domain)
+				pdev->dev.pm_domain = asoc_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);
+		}	
+		break;
+	case BUS_NOTIFY_UNBOUND_DRIVER:
+		if ((pdata->dev_desc->flags & ACPI_SOC_PM)){
+			if (asoc_entry->pm_domain)
+				pdev->dev.pm_domain = asoc_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;
+	case BUS_NOTIFY_ADD_DEVICE:
+		if ((pdata->dev_desc->flags & ACPI_SOC_SYSFS) &&
asoc_entry->pm_domain)
+			return sysfs_create_group(&pdev->dev.kobj,
+						  asoc_entry->attr_group);
+	case BUS_NOTIFY_DEL_DEVICE:
+		if ((pdata->dev_desc->flags & ACPI_SOC_SYSFS) &&
asoc_entry->pm_domain)
+			sysfs_remove_group(&pdev->dev.kobj, asoc_entry->attr_group);
+	default:
+		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);
+	return;
+}
+
+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);
+	return;
+}
+
+void register_acpi_soc(struct acpi_soc *asoc, bool
disable_scan_handler)
+{
+	struct acpi_scan_handler *acpi_soc_handler;
+	
+	INIT_LIST_HEAD(&asoc->list);
+	list_add(&asoc->list, &asoc_list);
+
+	acpi_soc_handler = kzalloc(sizeof(struct acpi_scan_handler),
GFP_KERNEL);
+	acpi_soc_handler->ids = asoc->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;
+	}	
+	acpi_scan_add_handler(acpi_soc_handler);
+	bus_register_notifier(&platform_bus_type, &acpi_soc_nb);
+}
+EXPORT_SYMBOL_GPL(register_acpi_soc);
diff --git a/drivers/acpi/acpi_soc.h b/drivers/acpi/acpi_soc.h
new file mode 100755
index 0000000..96db30e
--- /dev/null
+++ b/drivers/acpi/acpi_soc.h
@@ -0,0 +1,91 @@
+/*
+ * ACPI SOC support for Intel Lynxpoint LPSS and AMD APD.
+ *
+ * Copyright (C) 2015, Intel Corporation & 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/acpi.h>
+#include <linux/clk.h>
+#include <linux/pm.h>
+
+/* Flags */
+#define ACPI_SOC_SYSFS	BIT(0)
+#define ACPI_SOC_PM		BIT(1)
+#define ACPI_SOC_PM_ON	BIT(2)
+
+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;
+};
+
+/**
+ * struct acpi_soc_dev_desc - a descriptor for acpi device 
+ * @flags: some device feature flags
+ * @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
+ * @setup: a hook routine to set device resource during create platform
device
+ * @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;
+	int (*setup)(struct acpi_soc_dev_private_data *pdata);
+	void (*bind)(struct acpi_soc_dev_private_data *pdata);
+	void (*unbind)(struct acpi_soc_dev_private_data *pdata);
+};
+
+/**
+ * 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
+ * @adev: apci device
+ *
+ */
+struct acpi_soc_dev_private_data {
+	void __iomem *mmio_base;
+	resource_size_t mmio_size;
+	
+	const struct acpi_soc_dev_desc *dev_desc;
+	struct acpi_device *adev;
+};
+
+/**
+ * register_acpi_soc - register a new acpi soc
+ * @asoc: acpi soc
+ * @disable_scan_handler: true means remove deafult scan handle
+ *					false means use deafult scan handle
+ * 
+ * register a new acpi soc into asoc_list and install deafult scan
handle.
+ */
+void register_acpi_soc(struct acpi_soc *asoc, bool
disable_scan_handler);
+
+#endif
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


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