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Message-ID: <CAHp75VcJxoRkRpgf7GhJLz00SpQVD_3C2s_t0fPyTHU-_Z7YDw@mail.gmail.com>
Date: Tue, 16 Dec 2014 12:19:17 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Ken Xue <Ken.Xue@....com>
Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
linux-acpi@...r.kernel.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3 V2] acpi:soc: merge common codes for creating platform device
On Thu, Dec 11, 2014 at 5:04 AM, Ken Xue <Ken.Xue@....com> wrote:
> 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.
My few comments below.
First of all, please, add me to the Cc list of this patch set in the future.
>
> Signed-off-by: Ken Xue <Ken.Xue@....com>
> ---
> drivers/acpi/Makefile | 2 +-
> drivers/acpi/acpi_soc.c | 224 ++++++++++++++++++++++++++++++++++++++++++++++++
> drivers/acpi/acpi_soc.h | 98 +++++++++++++++++++++
> 3 files changed, 323 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..46901d5
> --- /dev/null
> +++ b/drivers/acpi/acpi_soc.c
> @@ -0,0 +1,224 @@
> +/*
> + * ACPI SOC support for Intel Lynxpoint LPSS and AMD APD.
> + *
> + * Copyright (C) 2015, Intel Corporation & AMD Corporation
2015? Wait couple of weeks :-)
Moreover, Intel code is copyrighted starting from 2013. I think it
would be better to keep two lines, one is original from Intel and one
from AMD.
> + * 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_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) {
> + 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))
> + 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)) {
No need to have double parentheses here and below in the other conditions.
It seems you took an old code here. We used to have a nasty bug which
was fixed recently, namely by cb39dcdd4ef6, 01ac170ba29a, and
6c17ee44d524.
Please, take most recent version from linux-pm tree.
> + 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->attr_group)
Unnecessary parentheses. Could it be one line?
> + 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)
Ditto.
> + 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, 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)
> +{
> + static int init;
> + 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;
> + 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..bada2a1
> --- /dev/null
> +++ b/drivers/acpi/acpi_soc.h
> @@ -0,0 +1,98 @@
> +/*
> + * 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>
> +
> +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
> + * @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);
> + 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
> + * @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 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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--
With Best Regards,
Andy Shevchenko
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