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Subject[PATCH 3/9] ACPI: add struct acpi_amba_quirk for AMD pl330 specific device config
Date
AMD pl330 is a UART DMA device, it shares one ACPI item with UART. So
a platform device and an acpi device will be created according to
AMD0020 ACPI dev. And its mem base address must have an offset. As a
result, MULTI_ATTACHED_QUIRK and MULTI_ATTACHED_QUIRK are used.

Signed-off-by: Wang Hongcheng <annie.wang@amd.com>
---
drivers/acpi/acpi_amba.c | 31 +++++++++++++++++++++++----
drivers/acpi/acpi_apd.c | 56 +++++++++++++++++++++++++++++++++++++-----------
include/linux/acpi.h | 13 +++++++++--
3 files changed, 81 insertions(+), 19 deletions(-)

diff --git a/drivers/acpi/acpi_amba.c b/drivers/acpi/acpi_amba.c
index 4f0366a..8a5269c 100644
--- a/drivers/acpi/acpi_amba.c
+++ b/drivers/acpi/acpi_amba.c
@@ -31,6 +31,8 @@ ACPI_MODULE_NAME("amba");
* @periphid: AMBA device periphid.
* @fixed_rate: Clock frequency.
* @pdata: Platform data specific to the device.
+ * @quirk: Specific device config, including device multiattach.
+ * and mem base offset.
*
* Check if the given @adev can be represented as an AMBA device and, if
* that's the case, create and register an AMBA device, populate its
@@ -42,7 +44,8 @@ ACPI_MODULE_NAME("amba");
struct amba_device *acpi_create_amba_device(struct acpi_device *adev,
unsigned int periphid,
unsigned long fixed_rate,
- void *pdata)
+ void *pdata,
+ struct acpi_amba_quirk *quirk)
{
struct amba_device *amba_dev = NULL;
struct device *parent;
@@ -54,12 +57,14 @@ struct amba_device *acpi_create_amba_device(struct acpi_device *adev,
unsigned int i;
unsigned int irq[AMBA_NR_IRQS];
struct clk *clk = ERR_PTR(-ENODEV);
+ char amba_devname[100];

/*
* If the ACPI node already has a physical device attached,
- * skip it.
+ * skip it. Except some special devices such as AMD0020 which
+ * needs attach physical devices two times.
*/
- if (adev->physical_node_count)
+ if (adev->physical_node_count && !(quirk->quirk & MULTI_ATTACHED_QUIRK))
return NULL;

INIT_LIST_HEAD(&resource_list);
@@ -85,7 +90,24 @@ struct amba_device *acpi_create_amba_device(struct acpi_device *adev,
memcpy(resource, rentry->res, sizeof(struct resource));
}

- amba_dev = amba_device_alloc(dev_name(&adev->dev),
+ /*
+ * The memory address of AMD pl330 has an offset of ACPI
+ * mem resource.
+ */
+ if (quirk->quirk & BASE_OFFSET_QUIRK)
+ resource->start += quirk->base_offset;
+
+ /*
+ * If the ACPI device already has a node attached. It must be
+ * renamed.
+ */
+ if (quirk->quirk & MULTI_ATTACHED_QUIRK)
+ sprintf(amba_devname, "%s%s", dev_name(&adev->dev), "DMA");
+ else
+ memcpy(amba_devname, dev_name(&adev->dev),
+ strlen(dev_name(&adev->dev)));
+
+ amba_dev = amba_device_alloc(amba_devname,
resource->start,
resource_size(resource));

@@ -136,6 +158,7 @@ struct amba_device *acpi_create_amba_device(struct acpi_device *adev,
if (ret)
goto amba_register_err;

+ amba_dev->dev.init_name = NULL;
ret = amba_device_add(amba_dev, resource);
if (ret)
goto amba_register_err;
diff --git a/drivers/acpi/acpi_apd.c b/drivers/acpi/acpi_apd.c
index a450e7a..eb3316a 100644
--- a/drivers/acpi/acpi_apd.c
+++ b/drivers/acpi/acpi_apd.c
@@ -3,7 +3,8 @@
*
* Copyright (c) 2014,2015 AMD Corporation.
* Authors: Ken Xue <Ken.Xue@amd.com>
- * Wu, Jeff <Jeff.Wu@amd.com>
+ * Jeff Wu <15618388108@163.com>
+ * Wang Hongcheng <Annie.Wang@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
@@ -17,6 +18,10 @@
#include <linux/acpi.h>
#include <linux/err.h>
#include <linux/pm.h>
+#include <linux/amba/bus.h>
+#include <linux/kernel.h>
+#include <linux/sizes.h>
+#include <linux/interrupt.h>

#include "internal.h"

@@ -31,14 +36,15 @@ struct apd_private_data;
#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
+ * 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
+ *0 means no fixed rate input clock source;
+ * @clk_con_id: name of input clock source;
+ * @setup: a hook routine to set device resource during create platform device.
*
- * Device description defined as acpi_device_id.driver_data
- */
+ * Device description defined as acpi_device_id.driver_data.
+*/
struct apd_device_desc {
unsigned int flags;
unsigned int fixed_clk_rate;
@@ -71,6 +77,15 @@ static int acpi_apd_setup(struct apd_private_data *pdata)
return 0;
}

+static void setup_quirks(struct platform_device *pdev,
+ struct acpi_amba_quirk *quirk)
+{
+ if (!strncmp(pdev->name, "AMD0020", 7)) {
+ quirk->quirk |= MULTI_ATTACHED_QUIRK | BASE_OFFSET_QUIRK;
+ quirk->base_offset = SZ_4K;
+ }
+}
+
static struct apd_device_desc cz_i2c_desc = {
.setup = acpi_apd_setup,
.fixed_clk_rate = 133000000,
@@ -88,15 +103,17 @@ static struct apd_device_desc cz_uart_desc = {
#endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */

/**
-* Create platform device during acpi scan attach handle.
-* Return value > 0 on success of creating 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 acpi_device_id *id)
{
const struct apd_device_desc *dev_desc = (void *)id->driver_data;
struct apd_private_data *pdata;
struct platform_device *pdev;
+ struct amba_device *amba_dev;
+ struct acpi_amba_quirk amba_quirks;
int ret;

if (!dev_desc) {
@@ -118,9 +135,22 @@ static int acpi_apd_create_device(struct acpi_device *adev,
}

adev->driver_data = pdata;
+
pdev = acpi_create_platform_device(adev);
- if (!IS_ERR_OR_NULL(pdev))
- return 1;
+ if (IS_ERR_OR_NULL(pdev))
+ goto err_out;
+
+ if (!strncmp(pdev->name, "AMD0020", 7)) {
+ memset(&amba_quirks, 0, sizeof(amba_quirks));
+ setup_quirks(pdev, &amba_quirks);
+
+ amba_dev = acpi_create_amba_device(pdata->adev, 0x00041330,
+ 48000000,
+ NULL,
+ &amba_quirks);
+ if (IS_ERR_OR_NULL(amba_dev))
+ goto err_out;
+ }

ret = PTR_ERR(pdev);
adev->driver_data = NULL;
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 04827d8..50961a5 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -468,19 +468,28 @@ void acpi_walk_dep_device_list(acpi_handle handle);

struct platform_device *acpi_create_platform_device(struct acpi_device *);

+struct acpi_amba_quirk {
+ u32 quirk;
+#define MULTI_ATTACHED_QUIRK BIT(0)
+#define BASE_OFFSET_QUIRK BIT(1)
+ u32 base_offset;
+};
+
#ifdef CONFIG_ARM_AMBA

struct amba_device *acpi_create_amba_device(struct acpi_device *adev,
unsigned int periphid,
unsigned long fixed_rate,
- void *pdata);
+ void *pdata,
+ struct acpi_amba_quirk *quirk);

#else /* !CONFIG_ARM_AMBA */

static inline struct amba_device *acpi_create_amba_device(struct acpi_device *adev,
unsigned int periphid,
unsigned long fixed_rate,
- void *pdata)
+ void *pdata,
+ struct acpi_amba_quirk *quirk)
{
return NULL;
}
--
1.9.1


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