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@xxxxxxx>
---
drivers/acpi/Makefile | 2 +-
drivers/acpi/acpi_soc.c | 211 ++++++++++++++++++++++++++++++++++++++++++++++++
drivers/acpi/acpi_soc.h | 90 +++++++++++++++++++++
3 files changed, 302 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 c3b2fcb..ae3397d 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..25089a0
--- /dev/null
+++ b/drivers/acpi/acpi_soc.c
@@ -0,0 +1,211 @@
+/*
+ * ACPI SOC support for Intel Lynxpoint LPSS and AMD APD.
+ *
+ * Copyright (C) 2015, Intel Corporation & AMD Corporation
+ * Authors: Ken Xue <Ken.Xue@xxxxxxx>
+ * Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
+ * Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
+ *
+ * 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(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_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->adev = adev;
+ pdata->dev_desc = dev_desc;
+
+ 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 *a_soc_entry;
+ const struct acpi_device_id *id = NULL;
+
+ 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_BOUND_DRIVER:
+ 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);
+ }
+ break;
+ case BUS_NOTIFY_UNBOUND_DRIVER:
+ 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;
+ case BUS_NOTIFY_ADD_DEVICE:
+ if ((pdata->dev_desc->flags & ACPI_SOC_SYSFS)
+ && a_soc_entry->pm_domain)
+ return sysfs_create_group(&pdev->dev.kobj,
+ a_soc_entry->attr_group);
+ case BUS_NOTIFY_DEL_DEVICE:
+ if ((pdata->dev_desc->flags & ACPI_SOC_SYSFS)
+ && a_soc_entry->pm_domain)
+ sysfs_remove_group(&pdev->dev.kobj,
+ a_soc_entry->attr_group);
+ 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);
+}
+
+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);
+}
+
+void register_acpi_soc(struct acpi_soc *a_soc, bool disable_scan_handler)
+{
+ struct acpi_scan_handler *acpi_soc_handler;
+
+ 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;
+ }
+ acpi_scan_add_handler(acpi_soc_handler);
+ bus_register_notifier(&platform_bus_type, &acpi_soc_nb);
+}
diff --git a/drivers/acpi/acpi_soc.h b/drivers/acpi/acpi_soc.h
new file mode 100644
index 0000000..cc270a5
--- /dev/null
+++ b/drivers/acpi/acpi_soc.h
@@ -0,0 +1,90 @@
+/*
+ * ACPI SOC support for Intel Lynxpoint LPSS and AMD APD.
+ *
+ * Copyright (C) 2015, Intel Corporation & AMD Corporation
+ * Authors: Ken Xue <Ken.Xue@xxxxxxx>
+ * Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
+ * Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
+ *
+ * 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;
+
+ struct acpi_soc_dev_desc *dev_desc;
+ struct acpi_device *adev;
+};
+
+/**
+ * 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);
+
+#endif
--
1.9.1
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