* [PATCH v3 1/3] ACPI: amba bus probing support
@ 2015-12-21 16:41 ` Aleksey Makarov
0 siblings, 0 replies; 18+ messages in thread
From: Aleksey Makarov @ 2015-12-21 16:41 UTC (permalink / raw)
To: linux-arm-kernel
From: Graeme Gregory <graeme.gregory@linaro.org>
On ARM64 some devices use the AMBA device and not the platform bus for
probing so add support for this. Uses a dummy clock for apb_pclk as ACPI
does not have a suitable clock representation and to keep the core
AMBA bus code unchanged between probing methods.
Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org>
---
drivers/acpi/Makefile | 1 +
drivers/acpi/acpi_amba.c | 149 +++++++++++++++++++++++++++++++++++++++++++++++
drivers/acpi/internal.h | 5 ++
3 files changed, 155 insertions(+)
create mode 100644 drivers/acpi/acpi_amba.c
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 675eaf3..3cf732f 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -43,6 +43,7 @@ acpi-y += pci_root.o pci_link.o pci_irq.o
acpi-y += acpi_lpss.o acpi_apd.o
acpi-y += acpi_platform.o
acpi-y += acpi_pnp.o
+acpi-$(CONFIG_ARM_AMBA) += acpi_amba.o
acpi-y += int340x_thermal.o
acpi-y += power.o
acpi-y += event.o
diff --git a/drivers/acpi/acpi_amba.c b/drivers/acpi/acpi_amba.c
new file mode 100644
index 0000000..ebc8913
--- /dev/null
+++ b/drivers/acpi/acpi_amba.c
@@ -0,0 +1,149 @@
+
+/*
+ * ACPI support for platform bus type.
+ *
+ * Copyright (C) 2015, Linaro Ltd
+ * Authors: Graeme Gregory <graeme.gregory@linaro.org>
+ *
+ * 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/amba/bus.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include "internal.h"
+
+static const struct acpi_device_id amba_id_list[] = {
+ {"ARMH0011", 0}, /* PL011 SBSA Uart */
+ {"ARMH0061", 0}, /* PL061 GPIO Device */
+ {"", 0},
+};
+
+static struct clk *amba_dummy_clk;
+
+static void amba_register_dummy_clk(void)
+{
+ struct clk *clk;
+
+ /* If clock already registered */
+ if (amba_dummy_clk)
+ return;
+
+ clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT, 0);
+ clk_register_clkdev(clk, "apb_pclk", NULL);
+
+ amba_dummy_clk = clk;
+}
+
+static int amba_handler_attach(struct acpi_device *adev,
+ const struct acpi_device_id *id)
+{
+ struct amba_device *dev = NULL;
+ struct acpi_device *acpi_parent;
+ struct resource_entry *rentry;
+ struct list_head resource_list;
+ struct resource *resources = NULL;
+ bool address_found = false;
+ int ret, count, irq_no = 0;
+
+ /* If the ACPI node already has a physical device attached, skip it. */
+ if (adev->physical_node_count)
+ return 0;
+
+ amba_register_dummy_clk();
+
+ dev = amba_device_alloc(NULL, 0, 0);
+ if (!dev) {
+ pr_err("%s(): amba_device_alloc() failed for %s\n",
+ __func__, dev_name(&adev->dev));
+ return 0;
+ }
+
+ INIT_LIST_HEAD(&resource_list);
+ count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
+ if (count < 0) {
+ return 0;
+ } else if (count > 0) {
+ resources = kmalloc_array(count, sizeof(struct resource),
+ GFP_KERNEL);
+ if (!resources) {
+ acpi_dev_free_resource_list(&resource_list);
+ return 0;
+ }
+ count = 0;
+ list_for_each_entry(rentry, &resource_list, node) {
+ switch (resource_type(rentry->res)) {
+ case IORESOURCE_MEM:
+ if (!address_found) {
+ dev->res = *rentry->res;
+ address_found = true;
+ }
+ break;
+ case IORESOURCE_IRQ:
+ if (irq_no < AMBA_NR_IRQS)
+ dev->irq[irq_no++] = rentry->res->start;
+ break;
+ default:
+ dev_warn(&adev->dev, "Invalid resource\n");
+ }
+ }
+ acpi_dev_free_resource_list(&resource_list);
+ }
+
+ /*
+ * If the ACPI node has a parent and that parent has a physical device
+ * attached to it, that physical device should be the parent of the
+ * platform device we are about to create.
+ */
+ dev->dev.parent = NULL;
+ acpi_parent = adev->parent;
+ if (acpi_parent) {
+ struct acpi_device_physical_node *entry;
+ struct list_head *list;
+
+ mutex_lock(&acpi_parent->physical_node_lock);
+ list = &acpi_parent->physical_node_list;
+ if (!list_empty(list)) {
+ entry = list_first_entry(list,
+ struct acpi_device_physical_node,
+ node);
+ dev->dev.parent = entry->dev;
+ }
+ mutex_unlock(&acpi_parent->physical_node_lock);
+ }
+
+ dev_set_name(&dev->dev, "%s", dev_name(&adev->dev));
+ ACPI_COMPANION_SET(&dev->dev, adev);
+
+ ret = amba_device_add(dev, &iomem_resource);
+ if (ret) {
+ pr_err("%s(): amba_device_add() failed (%d) for %s\n",
+ __func__, ret, dev_name(&adev->dev));
+ goto err_free;
+ }
+
+ return 1;
+
+err_free:
+ amba_device_put(dev);
+ return 0;
+}
+
+static struct acpi_scan_handler amba_handler = {
+ .ids = amba_id_list,
+ .attach = amba_handler_attach,
+};
+
+void __init acpi_amba_init(void)
+{
+ acpi_scan_add_handler(&amba_handler);
+}
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 11d87bf..9d58f0c 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -29,6 +29,11 @@ void acpi_processor_init(void);
void acpi_platform_init(void);
void acpi_pnp_init(void);
void acpi_int340x_thermal_init(void);
+#ifdef CONFIG_ARM_AMBA
+void acpi_amba_init(void);
+#else
+static inline void acpi_amba_init(void) {}
+#endif
int acpi_sysfs_init(void);
void acpi_container_init(void);
void acpi_memory_hotplug_init(void);
--
2.6.4
^ permalink raw reply related [flat|nested] 18+ messages in thread* Re: [PATCH v3 1/3] ACPI: amba bus probing support
2015-12-21 16:41 ` Aleksey Makarov
@ 2015-12-21 18:19 ` Andy Shevchenko
-1 siblings, 0 replies; 18+ messages in thread
From: Andy Shevchenko @ 2015-12-21 18:19 UTC (permalink / raw)
To: Aleksey Makarov
Cc: linux-acpi, linux-kernel, linux-serial, linux-arm Mailing List,
Graeme Gregory, Russell King, Greg Kroah-Hartman,
Rafael J . Wysocki, Shannon Zhao, Len Brown
On Mon, Dec 21, 2015 at 6:41 PM, Aleksey Makarov
<aleksey.makarov@linaro.org> wrote:
> From: Graeme Gregory <graeme.gregory@linaro.org>
>
> On ARM64 some devices use the AMBA device and not the platform bus for
> probing so add support for this. Uses a dummy clock for apb_pclk as ACPI
> does not have a suitable clock representation and to keep the core
> AMBA bus code unchanged between probing methods.
>
> Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
> Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org>
> ---
> drivers/acpi/Makefile | 1 +
> drivers/acpi/acpi_amba.c | 149 +++++++++++++++++++++++++++++++++++++++++++++++
> drivers/acpi/internal.h | 5 ++
> 3 files changed, 155 insertions(+)
> create mode 100644 drivers/acpi/acpi_amba.c
>
> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
> index 675eaf3..3cf732f 100644
> --- a/drivers/acpi/Makefile
> +++ b/drivers/acpi/Makefile
> @@ -43,6 +43,7 @@ acpi-y += pci_root.o pci_link.o pci_irq.o
> acpi-y += acpi_lpss.o acpi_apd.o
> acpi-y += acpi_platform.o
> acpi-y += acpi_pnp.o
> +acpi-$(CONFIG_ARM_AMBA) += acpi_amba.o
> acpi-y += int340x_thermal.o
> acpi-y += power.o
> acpi-y += event.o
> diff --git a/drivers/acpi/acpi_amba.c b/drivers/acpi/acpi_amba.c
> new file mode 100644
> index 0000000..ebc8913
> --- /dev/null
> +++ b/drivers/acpi/acpi_amba.c
> @@ -0,0 +1,149 @@
> +
> +/*
> + * ACPI support for platform bus type.
> + *
> + * Copyright (C) 2015, Linaro Ltd
> + * Authors: Graeme Gregory <graeme.gregory@linaro.org>
> + *
> + * 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/amba/bus.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk-provider.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/ioport.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +
> +#include "internal.h"
> +
> +static const struct acpi_device_id amba_id_list[] = {
> + {"ARMH0011", 0}, /* PL011 SBSA Uart */
> + {"ARMH0061", 0}, /* PL061 GPIO Device */
> + {"", 0},
> +};
> +
> +static struct clk *amba_dummy_clk;
> +
> +static void amba_register_dummy_clk(void)
> +{
> + struct clk *clk;
> +
> + /* If clock already registered */
> + if (amba_dummy_clk)
> + return;
> +
> + clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT, 0);
> + clk_register_clkdev(clk, "apb_pclk", NULL);
> +
> + amba_dummy_clk = clk;
> +}
> +
> +static int amba_handler_attach(struct acpi_device *adev,
> + const struct acpi_device_id *id)
> +{
> + struct amba_device *dev = NULL;
> + struct acpi_device *acpi_parent;
> + struct resource_entry *rentry;
> + struct list_head resource_list;
> + struct resource *resources = NULL;
> + bool address_found = false;
> + int ret, count, irq_no = 0;
> +
> + /* If the ACPI node already has a physical device attached, skip it. */
> + if (adev->physical_node_count)
> + return 0;
> +
> + amba_register_dummy_clk();
> +
> + dev = amba_device_alloc(NULL, 0, 0);
> + if (!dev) {
> + pr_err("%s(): amba_device_alloc() failed for %s\n",
Can it be dev_err(&adev->dev, …); ?
Same for below cases.
> + __func__, dev_name(&adev->dev));
> + return 0;
> + }
> +
> + INIT_LIST_HEAD(&resource_list);
> + count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
> + if (count < 0) {
> + return 0;
> + } else if (count > 0) {
> + resources = kmalloc_array(count, sizeof(struct resource),
> + GFP_KERNEL);
> + if (!resources) {
> + acpi_dev_free_resource_list(&resource_list);
> + return 0;
> + }
> + count = 0;
> + list_for_each_entry(rentry, &resource_list, node) {
> + switch (resource_type(rentry->res)) {
> + case IORESOURCE_MEM:
> + if (!address_found) {
> + dev->res = *rentry->res;
> + address_found = true;
> + }
> + break;
> + case IORESOURCE_IRQ:
> + if (irq_no < AMBA_NR_IRQS)
> + dev->irq[irq_no++] = rentry->res->start;
> + break;
> + default:
> + dev_warn(&adev->dev, "Invalid resource\n");
> + }
> + }
> + acpi_dev_free_resource_list(&resource_list);
> + }
> +
> + /*
> + * If the ACPI node has a parent and that parent has a physical device
> + * attached to it, that physical device should be the parent of the
> + * platform device we are about to create.
> + */
> + dev->dev.parent = NULL;
> + acpi_parent = adev->parent;
> + if (acpi_parent) {
> + struct acpi_device_physical_node *entry;
> + struct list_head *list;
> +
> + mutex_lock(&acpi_parent->physical_node_lock);
> + list = &acpi_parent->physical_node_list;
> + if (!list_empty(list)) {
> + entry = list_first_entry(list,
> + struct acpi_device_physical_node,
> + node);
> + dev->dev.parent = entry->dev;
> + }
> + mutex_unlock(&acpi_parent->physical_node_lock);
> + }
> +
> + dev_set_name(&dev->dev, "%s", dev_name(&adev->dev));
> + ACPI_COMPANION_SET(&dev->dev, adev);
> +
> + ret = amba_device_add(dev, &iomem_resource);
> + if (ret) {
> + pr_err("%s(): amba_device_add() failed (%d) for %s\n",
> + __func__, ret, dev_name(&adev->dev));
> + goto err_free;
> + }
> +
> + return 1;
> +
> +err_free:
> + amba_device_put(dev);
> + return 0;
> +}
> +
> +static struct acpi_scan_handler amba_handler = {
> + .ids = amba_id_list,
> + .attach = amba_handler_attach,
> +};
> +
> +void __init acpi_amba_init(void)
> +{
> + acpi_scan_add_handler(&amba_handler);
> +}
> diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
> index 11d87bf..9d58f0c 100644
> --- a/drivers/acpi/internal.h
> +++ b/drivers/acpi/internal.h
> @@ -29,6 +29,11 @@ void acpi_processor_init(void);
> void acpi_platform_init(void);
> void acpi_pnp_init(void);
> void acpi_int340x_thermal_init(void);
> +#ifdef CONFIG_ARM_AMBA
> +void acpi_amba_init(void);
> +#else
> +static inline void acpi_amba_init(void) {}
> +#endif
> int acpi_sysfs_init(void);
> void acpi_container_init(void);
> void acpi_memory_hotplug_init(void);
> --
> 2.6.4
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 18+ messages in thread* [PATCH v3 1/3] ACPI: amba bus probing support
@ 2015-12-21 18:19 ` Andy Shevchenko
0 siblings, 0 replies; 18+ messages in thread
From: Andy Shevchenko @ 2015-12-21 18:19 UTC (permalink / raw)
To: linux-arm-kernel
On Mon, Dec 21, 2015 at 6:41 PM, Aleksey Makarov
<aleksey.makarov@linaro.org> wrote:
> From: Graeme Gregory <graeme.gregory@linaro.org>
>
> On ARM64 some devices use the AMBA device and not the platform bus for
> probing so add support for this. Uses a dummy clock for apb_pclk as ACPI
> does not have a suitable clock representation and to keep the core
> AMBA bus code unchanged between probing methods.
>
> Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
> Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org>
> ---
> drivers/acpi/Makefile | 1 +
> drivers/acpi/acpi_amba.c | 149 +++++++++++++++++++++++++++++++++++++++++++++++
> drivers/acpi/internal.h | 5 ++
> 3 files changed, 155 insertions(+)
> create mode 100644 drivers/acpi/acpi_amba.c
>
> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
> index 675eaf3..3cf732f 100644
> --- a/drivers/acpi/Makefile
> +++ b/drivers/acpi/Makefile
> @@ -43,6 +43,7 @@ acpi-y += pci_root.o pci_link.o pci_irq.o
> acpi-y += acpi_lpss.o acpi_apd.o
> acpi-y += acpi_platform.o
> acpi-y += acpi_pnp.o
> +acpi-$(CONFIG_ARM_AMBA) += acpi_amba.o
> acpi-y += int340x_thermal.o
> acpi-y += power.o
> acpi-y += event.o
> diff --git a/drivers/acpi/acpi_amba.c b/drivers/acpi/acpi_amba.c
> new file mode 100644
> index 0000000..ebc8913
> --- /dev/null
> +++ b/drivers/acpi/acpi_amba.c
> @@ -0,0 +1,149 @@
> +
> +/*
> + * ACPI support for platform bus type.
> + *
> + * Copyright (C) 2015, Linaro Ltd
> + * Authors: Graeme Gregory <graeme.gregory@linaro.org>
> + *
> + * 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/amba/bus.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk-provider.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/ioport.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +
> +#include "internal.h"
> +
> +static const struct acpi_device_id amba_id_list[] = {
> + {"ARMH0011", 0}, /* PL011 SBSA Uart */
> + {"ARMH0061", 0}, /* PL061 GPIO Device */
> + {"", 0},
> +};
> +
> +static struct clk *amba_dummy_clk;
> +
> +static void amba_register_dummy_clk(void)
> +{
> + struct clk *clk;
> +
> + /* If clock already registered */
> + if (amba_dummy_clk)
> + return;
> +
> + clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT, 0);
> + clk_register_clkdev(clk, "apb_pclk", NULL);
> +
> + amba_dummy_clk = clk;
> +}
> +
> +static int amba_handler_attach(struct acpi_device *adev,
> + const struct acpi_device_id *id)
> +{
> + struct amba_device *dev = NULL;
> + struct acpi_device *acpi_parent;
> + struct resource_entry *rentry;
> + struct list_head resource_list;
> + struct resource *resources = NULL;
> + bool address_found = false;
> + int ret, count, irq_no = 0;
> +
> + /* If the ACPI node already has a physical device attached, skip it. */
> + if (adev->physical_node_count)
> + return 0;
> +
> + amba_register_dummy_clk();
> +
> + dev = amba_device_alloc(NULL, 0, 0);
> + if (!dev) {
> + pr_err("%s(): amba_device_alloc() failed for %s\n",
Can it be dev_err(&adev->dev, ?); ?
Same for below cases.
> + __func__, dev_name(&adev->dev));
> + return 0;
> + }
> +
> + INIT_LIST_HEAD(&resource_list);
> + count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
> + if (count < 0) {
> + return 0;
> + } else if (count > 0) {
> + resources = kmalloc_array(count, sizeof(struct resource),
> + GFP_KERNEL);
> + if (!resources) {
> + acpi_dev_free_resource_list(&resource_list);
> + return 0;
> + }
> + count = 0;
> + list_for_each_entry(rentry, &resource_list, node) {
> + switch (resource_type(rentry->res)) {
> + case IORESOURCE_MEM:
> + if (!address_found) {
> + dev->res = *rentry->res;
> + address_found = true;
> + }
> + break;
> + case IORESOURCE_IRQ:
> + if (irq_no < AMBA_NR_IRQS)
> + dev->irq[irq_no++] = rentry->res->start;
> + break;
> + default:
> + dev_warn(&adev->dev, "Invalid resource\n");
> + }
> + }
> + acpi_dev_free_resource_list(&resource_list);
> + }
> +
> + /*
> + * If the ACPI node has a parent and that parent has a physical device
> + * attached to it, that physical device should be the parent of the
> + * platform device we are about to create.
> + */
> + dev->dev.parent = NULL;
> + acpi_parent = adev->parent;
> + if (acpi_parent) {
> + struct acpi_device_physical_node *entry;
> + struct list_head *list;
> +
> + mutex_lock(&acpi_parent->physical_node_lock);
> + list = &acpi_parent->physical_node_list;
> + if (!list_empty(list)) {
> + entry = list_first_entry(list,
> + struct acpi_device_physical_node,
> + node);
> + dev->dev.parent = entry->dev;
> + }
> + mutex_unlock(&acpi_parent->physical_node_lock);
> + }
> +
> + dev_set_name(&dev->dev, "%s", dev_name(&adev->dev));
> + ACPI_COMPANION_SET(&dev->dev, adev);
> +
> + ret = amba_device_add(dev, &iomem_resource);
> + if (ret) {
> + pr_err("%s(): amba_device_add() failed (%d) for %s\n",
> + __func__, ret, dev_name(&adev->dev));
> + goto err_free;
> + }
> +
> + return 1;
> +
> +err_free:
> + amba_device_put(dev);
> + return 0;
> +}
> +
> +static struct acpi_scan_handler amba_handler = {
> + .ids = amba_id_list,
> + .attach = amba_handler_attach,
> +};
> +
> +void __init acpi_amba_init(void)
> +{
> + acpi_scan_add_handler(&amba_handler);
> +}
> diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
> index 11d87bf..9d58f0c 100644
> --- a/drivers/acpi/internal.h
> +++ b/drivers/acpi/internal.h
> @@ -29,6 +29,11 @@ void acpi_processor_init(void);
> void acpi_platform_init(void);
> void acpi_pnp_init(void);
> void acpi_int340x_thermal_init(void);
> +#ifdef CONFIG_ARM_AMBA
> +void acpi_amba_init(void);
> +#else
> +static inline void acpi_amba_init(void) {}
> +#endif
> int acpi_sysfs_init(void);
> void acpi_container_init(void);
> void acpi_memory_hotplug_init(void);
> --
> 2.6.4
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo at vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 18+ messages in thread* Re: [PATCH v3 1/3] ACPI: amba bus probing support
2015-12-21 18:19 ` Andy Shevchenko
(?)
@ 2015-12-21 21:11 ` G Gregory
-1 siblings, 0 replies; 18+ messages in thread
From: G Gregory @ 2015-12-21 21:11 UTC (permalink / raw)
To: Andy Shevchenko
Cc: Aleksey Makarov, linux-acpi, linux-kernel, linux-serial,
linux-arm Mailing List, Russell King, Greg Kroah-Hartman,
Rafael J . Wysocki, Shannon Zhao, Len Brown
On 21 December 2015 at 18:19, Andy Shevchenko <andy.shevchenko@gmail.com> wrote:
> On Mon, Dec 21, 2015 at 6:41 PM, Aleksey Makarov
> <aleksey.makarov@linaro.org> wrote:
>> From: Graeme Gregory <graeme.gregory@linaro.org>
>>
>> On ARM64 some devices use the AMBA device and not the platform bus for
>> probing so add support for this. Uses a dummy clock for apb_pclk as ACPI
>> does not have a suitable clock representation and to keep the core
>> AMBA bus code unchanged between probing methods.
>>
>> Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
>> Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org>
>> ---
>> drivers/acpi/Makefile | 1 +
>> drivers/acpi/acpi_amba.c | 149 +++++++++++++++++++++++++++++++++++++++++++++++
>> drivers/acpi/internal.h | 5 ++
>> 3 files changed, 155 insertions(+)
>> create mode 100644 drivers/acpi/acpi_amba.c
>>
>> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
>> index 675eaf3..3cf732f 100644
>> --- a/drivers/acpi/Makefile
>> +++ b/drivers/acpi/Makefile
>> @@ -43,6 +43,7 @@ acpi-y += pci_root.o pci_link.o pci_irq.o
>> acpi-y += acpi_lpss.o acpi_apd.o
>> acpi-y += acpi_platform.o
>> acpi-y += acpi_pnp.o
>> +acpi-$(CONFIG_ARM_AMBA) += acpi_amba.o
>> acpi-y += int340x_thermal.o
>> acpi-y += power.o
>> acpi-y += event.o
>> diff --git a/drivers/acpi/acpi_amba.c b/drivers/acpi/acpi_amba.c
>> new file mode 100644
>> index 0000000..ebc8913
>> --- /dev/null
>> +++ b/drivers/acpi/acpi_amba.c
>> @@ -0,0 +1,149 @@
>> +
>> +/*
>> + * ACPI support for platform bus type.
>> + *
>> + * Copyright (C) 2015, Linaro Ltd
>> + * Authors: Graeme Gregory <graeme.gregory@linaro.org>
>> + *
>> + * 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/amba/bus.h>
>> +#include <linux/clkdev.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/device.h>
>> +#include <linux/err.h>
>> +#include <linux/ioport.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +
>> +#include "internal.h"
>> +
>> +static const struct acpi_device_id amba_id_list[] = {
>> + {"ARMH0011", 0}, /* PL011 SBSA Uart */
>> + {"ARMH0061", 0}, /* PL061 GPIO Device */
>> + {"", 0},
>> +};
>> +
>> +static struct clk *amba_dummy_clk;
>> +
>> +static void amba_register_dummy_clk(void)
>> +{
>> + struct clk *clk;
>> +
>> + /* If clock already registered */
>> + if (amba_dummy_clk)
>> + return;
>> +
>> + clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT, 0);
>> + clk_register_clkdev(clk, "apb_pclk", NULL);
>> +
>> + amba_dummy_clk = clk;
>> +}
>> +
>> +static int amba_handler_attach(struct acpi_device *adev,
>> + const struct acpi_device_id *id)
>> +{
>> + struct amba_device *dev = NULL;
>> + struct acpi_device *acpi_parent;
>> + struct resource_entry *rentry;
>> + struct list_head resource_list;
>> + struct resource *resources = NULL;
>> + bool address_found = false;
>> + int ret, count, irq_no = 0;
>> +
>> + /* If the ACPI node already has a physical device attached, skip it. */
>> + if (adev->physical_node_count)
>> + return 0;
>> +
>> + amba_register_dummy_clk();
>> +
>> + dev = amba_device_alloc(NULL, 0, 0);
>> + if (!dev) {
>> + pr_err("%s(): amba_device_alloc() failed for %s\n",
>
> Can it be dev_err(&adev->dev, …); ?
> Same for below cases.
>
Yes it probably can, I took the code directly from DT version and
didn't think of using adev->dev directly.
Graeme
>> + __func__, dev_name(&adev->dev));
>> + return 0;
>> + }
>> +
>> + INIT_LIST_HEAD(&resource_list);
>
>> + count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
>> + if (count < 0) {
>> + return 0;
>> + } else if (count > 0) {
>> + resources = kmalloc_array(count, sizeof(struct resource),
>> + GFP_KERNEL);
>> + if (!resources) {
>> + acpi_dev_free_resource_list(&resource_list);
>> + return 0;
>> + }
>> + count = 0;
>> + list_for_each_entry(rentry, &resource_list, node) {
>> + switch (resource_type(rentry->res)) {
>> + case IORESOURCE_MEM:
>> + if (!address_found) {
>> + dev->res = *rentry->res;
>> + address_found = true;
>> + }
>> + break;
>> + case IORESOURCE_IRQ:
>> + if (irq_no < AMBA_NR_IRQS)
>> + dev->irq[irq_no++] = rentry->res->start;
>> + break;
>> + default:
>> + dev_warn(&adev->dev, "Invalid resource\n");
>> + }
>> + }
>> + acpi_dev_free_resource_list(&resource_list);
>> + }
>> +
>> + /*
>> + * If the ACPI node has a parent and that parent has a physical device
>> + * attached to it, that physical device should be the parent of the
>> + * platform device we are about to create.
>> + */
>> + dev->dev.parent = NULL;
>> + acpi_parent = adev->parent;
>> + if (acpi_parent) {
>> + struct acpi_device_physical_node *entry;
>> + struct list_head *list;
>> +
>> + mutex_lock(&acpi_parent->physical_node_lock);
>> + list = &acpi_parent->physical_node_list;
>> + if (!list_empty(list)) {
>> + entry = list_first_entry(list,
>> + struct acpi_device_physical_node,
>> + node);
>> + dev->dev.parent = entry->dev;
>> + }
>> + mutex_unlock(&acpi_parent->physical_node_lock);
>> + }
>> +
>> + dev_set_name(&dev->dev, "%s", dev_name(&adev->dev));
>> + ACPI_COMPANION_SET(&dev->dev, adev);
>> +
>> + ret = amba_device_add(dev, &iomem_resource);
>> + if (ret) {
>> + pr_err("%s(): amba_device_add() failed (%d) for %s\n",
>> + __func__, ret, dev_name(&adev->dev));
>> + goto err_free;
>> + }
>> +
>> + return 1;
>> +
>> +err_free:
>> + amba_device_put(dev);
>> + return 0;
>> +}
>> +
>> +static struct acpi_scan_handler amba_handler = {
>> + .ids = amba_id_list,
>> + .attach = amba_handler_attach,
>> +};
>> +
>> +void __init acpi_amba_init(void)
>> +{
>> + acpi_scan_add_handler(&amba_handler);
>> +}
>> diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
>> index 11d87bf..9d58f0c 100644
>> --- a/drivers/acpi/internal.h
>> +++ b/drivers/acpi/internal.h
>> @@ -29,6 +29,11 @@ void acpi_processor_init(void);
>> void acpi_platform_init(void);
>> void acpi_pnp_init(void);
>> void acpi_int340x_thermal_init(void);
>> +#ifdef CONFIG_ARM_AMBA
>> +void acpi_amba_init(void);
>> +#else
>> +static inline void acpi_amba_init(void) {}
>> +#endif
>> int acpi_sysfs_init(void);
>> void acpi_container_init(void);
>> void acpi_memory_hotplug_init(void);
>> --
>> 2.6.4
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>> Please read the FAQ at http://www.tux.org/lkml/
>
>
>
> --
> With Best Regards,
> Andy Shevchenko
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply [flat|nested] 18+ messages in thread* [PATCH v3 1/3] ACPI: amba bus probing support
@ 2015-12-21 21:11 ` G Gregory
0 siblings, 0 replies; 18+ messages in thread
From: G Gregory @ 2015-12-21 21:11 UTC (permalink / raw)
To: linux-arm-kernel
On 21 December 2015 at 18:19, Andy Shevchenko <andy.shevchenko@gmail.com> wrote:
> On Mon, Dec 21, 2015 at 6:41 PM, Aleksey Makarov
> <aleksey.makarov@linaro.org> wrote:
>> From: Graeme Gregory <graeme.gregory@linaro.org>
>>
>> On ARM64 some devices use the AMBA device and not the platform bus for
>> probing so add support for this. Uses a dummy clock for apb_pclk as ACPI
>> does not have a suitable clock representation and to keep the core
>> AMBA bus code unchanged between probing methods.
>>
>> Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
>> Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org>
>> ---
>> drivers/acpi/Makefile | 1 +
>> drivers/acpi/acpi_amba.c | 149 +++++++++++++++++++++++++++++++++++++++++++++++
>> drivers/acpi/internal.h | 5 ++
>> 3 files changed, 155 insertions(+)
>> create mode 100644 drivers/acpi/acpi_amba.c
>>
>> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
>> index 675eaf3..3cf732f 100644
>> --- a/drivers/acpi/Makefile
>> +++ b/drivers/acpi/Makefile
>> @@ -43,6 +43,7 @@ acpi-y += pci_root.o pci_link.o pci_irq.o
>> acpi-y += acpi_lpss.o acpi_apd.o
>> acpi-y += acpi_platform.o
>> acpi-y += acpi_pnp.o
>> +acpi-$(CONFIG_ARM_AMBA) += acpi_amba.o
>> acpi-y += int340x_thermal.o
>> acpi-y += power.o
>> acpi-y += event.o
>> diff --git a/drivers/acpi/acpi_amba.c b/drivers/acpi/acpi_amba.c
>> new file mode 100644
>> index 0000000..ebc8913
>> --- /dev/null
>> +++ b/drivers/acpi/acpi_amba.c
>> @@ -0,0 +1,149 @@
>> +
>> +/*
>> + * ACPI support for platform bus type.
>> + *
>> + * Copyright (C) 2015, Linaro Ltd
>> + * Authors: Graeme Gregory <graeme.gregory@linaro.org>
>> + *
>> + * 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/amba/bus.h>
>> +#include <linux/clkdev.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/device.h>
>> +#include <linux/err.h>
>> +#include <linux/ioport.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +
>> +#include "internal.h"
>> +
>> +static const struct acpi_device_id amba_id_list[] = {
>> + {"ARMH0011", 0}, /* PL011 SBSA Uart */
>> + {"ARMH0061", 0}, /* PL061 GPIO Device */
>> + {"", 0},
>> +};
>> +
>> +static struct clk *amba_dummy_clk;
>> +
>> +static void amba_register_dummy_clk(void)
>> +{
>> + struct clk *clk;
>> +
>> + /* If clock already registered */
>> + if (amba_dummy_clk)
>> + return;
>> +
>> + clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT, 0);
>> + clk_register_clkdev(clk, "apb_pclk", NULL);
>> +
>> + amba_dummy_clk = clk;
>> +}
>> +
>> +static int amba_handler_attach(struct acpi_device *adev,
>> + const struct acpi_device_id *id)
>> +{
>> + struct amba_device *dev = NULL;
>> + struct acpi_device *acpi_parent;
>> + struct resource_entry *rentry;
>> + struct list_head resource_list;
>> + struct resource *resources = NULL;
>> + bool address_found = false;
>> + int ret, count, irq_no = 0;
>> +
>> + /* If the ACPI node already has a physical device attached, skip it. */
>> + if (adev->physical_node_count)
>> + return 0;
>> +
>> + amba_register_dummy_clk();
>> +
>> + dev = amba_device_alloc(NULL, 0, 0);
>> + if (!dev) {
>> + pr_err("%s(): amba_device_alloc() failed for %s\n",
>
> Can it be dev_err(&adev->dev, ?); ?
> Same for below cases.
>
Yes it probably can, I took the code directly from DT version and
didn't think of using adev->dev directly.
Graeme
>> + __func__, dev_name(&adev->dev));
>> + return 0;
>> + }
>> +
>> + INIT_LIST_HEAD(&resource_list);
>
>> + count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
>> + if (count < 0) {
>> + return 0;
>> + } else if (count > 0) {
>> + resources = kmalloc_array(count, sizeof(struct resource),
>> + GFP_KERNEL);
>> + if (!resources) {
>> + acpi_dev_free_resource_list(&resource_list);
>> + return 0;
>> + }
>> + count = 0;
>> + list_for_each_entry(rentry, &resource_list, node) {
>> + switch (resource_type(rentry->res)) {
>> + case IORESOURCE_MEM:
>> + if (!address_found) {
>> + dev->res = *rentry->res;
>> + address_found = true;
>> + }
>> + break;
>> + case IORESOURCE_IRQ:
>> + if (irq_no < AMBA_NR_IRQS)
>> + dev->irq[irq_no++] = rentry->res->start;
>> + break;
>> + default:
>> + dev_warn(&adev->dev, "Invalid resource\n");
>> + }
>> + }
>> + acpi_dev_free_resource_list(&resource_list);
>> + }
>> +
>> + /*
>> + * If the ACPI node has a parent and that parent has a physical device
>> + * attached to it, that physical device should be the parent of the
>> + * platform device we are about to create.
>> + */
>> + dev->dev.parent = NULL;
>> + acpi_parent = adev->parent;
>> + if (acpi_parent) {
>> + struct acpi_device_physical_node *entry;
>> + struct list_head *list;
>> +
>> + mutex_lock(&acpi_parent->physical_node_lock);
>> + list = &acpi_parent->physical_node_list;
>> + if (!list_empty(list)) {
>> + entry = list_first_entry(list,
>> + struct acpi_device_physical_node,
>> + node);
>> + dev->dev.parent = entry->dev;
>> + }
>> + mutex_unlock(&acpi_parent->physical_node_lock);
>> + }
>> +
>> + dev_set_name(&dev->dev, "%s", dev_name(&adev->dev));
>> + ACPI_COMPANION_SET(&dev->dev, adev);
>> +
>> + ret = amba_device_add(dev, &iomem_resource);
>> + if (ret) {
>> + pr_err("%s(): amba_device_add() failed (%d) for %s\n",
>> + __func__, ret, dev_name(&adev->dev));
>> + goto err_free;
>> + }
>> +
>> + return 1;
>> +
>> +err_free:
>> + amba_device_put(dev);
>> + return 0;
>> +}
>> +
>> +static struct acpi_scan_handler amba_handler = {
>> + .ids = amba_id_list,
>> + .attach = amba_handler_attach,
>> +};
>> +
>> +void __init acpi_amba_init(void)
>> +{
>> + acpi_scan_add_handler(&amba_handler);
>> +}
>> diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
>> index 11d87bf..9d58f0c 100644
>> --- a/drivers/acpi/internal.h
>> +++ b/drivers/acpi/internal.h
>> @@ -29,6 +29,11 @@ void acpi_processor_init(void);
>> void acpi_platform_init(void);
>> void acpi_pnp_init(void);
>> void acpi_int340x_thermal_init(void);
>> +#ifdef CONFIG_ARM_AMBA
>> +void acpi_amba_init(void);
>> +#else
>> +static inline void acpi_amba_init(void) {}
>> +#endif
>> int acpi_sysfs_init(void);
>> void acpi_container_init(void);
>> void acpi_memory_hotplug_init(void);
>> --
>> 2.6.4
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>> the body of a message to majordomo at vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>> Please read the FAQ at http://www.tux.org/lkml/
>
>
>
> --
> With Best Regards,
> Andy Shevchenko
^ permalink raw reply [flat|nested] 18+ messages in thread* Re: [PATCH v3 1/3] ACPI: amba bus probing support
@ 2015-12-21 21:11 ` G Gregory
0 siblings, 0 replies; 18+ messages in thread
From: G Gregory @ 2015-12-21 21:11 UTC (permalink / raw)
To: Andy Shevchenko
Cc: Aleksey Makarov, linux-acpi, linux-kernel, linux-serial,
linux-arm Mailing List, Russell King, Greg Kroah-Hartman,
Rafael J . Wysocki, Shannon Zhao, Len Brown
On 21 December 2015 at 18:19, Andy Shevchenko <andy.shevchenko@gmail.com> wrote:
> On Mon, Dec 21, 2015 at 6:41 PM, Aleksey Makarov
> <aleksey.makarov@linaro.org> wrote:
>> From: Graeme Gregory <graeme.gregory@linaro.org>
>>
>> On ARM64 some devices use the AMBA device and not the platform bus for
>> probing so add support for this. Uses a dummy clock for apb_pclk as ACPI
>> does not have a suitable clock representation and to keep the core
>> AMBA bus code unchanged between probing methods.
>>
>> Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
>> Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org>
>> ---
>> drivers/acpi/Makefile | 1 +
>> drivers/acpi/acpi_amba.c | 149 +++++++++++++++++++++++++++++++++++++++++++++++
>> drivers/acpi/internal.h | 5 ++
>> 3 files changed, 155 insertions(+)
>> create mode 100644 drivers/acpi/acpi_amba.c
>>
>> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
>> index 675eaf3..3cf732f 100644
>> --- a/drivers/acpi/Makefile
>> +++ b/drivers/acpi/Makefile
>> @@ -43,6 +43,7 @@ acpi-y += pci_root.o pci_link.o pci_irq.o
>> acpi-y += acpi_lpss.o acpi_apd.o
>> acpi-y += acpi_platform.o
>> acpi-y += acpi_pnp.o
>> +acpi-$(CONFIG_ARM_AMBA) += acpi_amba.o
>> acpi-y += int340x_thermal.o
>> acpi-y += power.o
>> acpi-y += event.o
>> diff --git a/drivers/acpi/acpi_amba.c b/drivers/acpi/acpi_amba.c
>> new file mode 100644
>> index 0000000..ebc8913
>> --- /dev/null
>> +++ b/drivers/acpi/acpi_amba.c
>> @@ -0,0 +1,149 @@
>> +
>> +/*
>> + * ACPI support for platform bus type.
>> + *
>> + * Copyright (C) 2015, Linaro Ltd
>> + * Authors: Graeme Gregory <graeme.gregory@linaro.org>
>> + *
>> + * 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/amba/bus.h>
>> +#include <linux/clkdev.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/device.h>
>> +#include <linux/err.h>
>> +#include <linux/ioport.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +
>> +#include "internal.h"
>> +
>> +static const struct acpi_device_id amba_id_list[] = {
>> + {"ARMH0011", 0}, /* PL011 SBSA Uart */
>> + {"ARMH0061", 0}, /* PL061 GPIO Device */
>> + {"", 0},
>> +};
>> +
>> +static struct clk *amba_dummy_clk;
>> +
>> +static void amba_register_dummy_clk(void)
>> +{
>> + struct clk *clk;
>> +
>> + /* If clock already registered */
>> + if (amba_dummy_clk)
>> + return;
>> +
>> + clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT, 0);
>> + clk_register_clkdev(clk, "apb_pclk", NULL);
>> +
>> + amba_dummy_clk = clk;
>> +}
>> +
>> +static int amba_handler_attach(struct acpi_device *adev,
>> + const struct acpi_device_id *id)
>> +{
>> + struct amba_device *dev = NULL;
>> + struct acpi_device *acpi_parent;
>> + struct resource_entry *rentry;
>> + struct list_head resource_list;
>> + struct resource *resources = NULL;
>> + bool address_found = false;
>> + int ret, count, irq_no = 0;
>> +
>> + /* If the ACPI node already has a physical device attached, skip it. */
>> + if (adev->physical_node_count)
>> + return 0;
>> +
>> + amba_register_dummy_clk();
>> +
>> + dev = amba_device_alloc(NULL, 0, 0);
>> + if (!dev) {
>> + pr_err("%s(): amba_device_alloc() failed for %s\n",
>
> Can it be dev_err(&adev->dev, …); ?
> Same for below cases.
>
Yes it probably can, I took the code directly from DT version and
didn't think of using adev->dev directly.
Graeme
>> + __func__, dev_name(&adev->dev));
>> + return 0;
>> + }
>> +
>> + INIT_LIST_HEAD(&resource_list);
>
>> + count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
>> + if (count < 0) {
>> + return 0;
>> + } else if (count > 0) {
>> + resources = kmalloc_array(count, sizeof(struct resource),
>> + GFP_KERNEL);
>> + if (!resources) {
>> + acpi_dev_free_resource_list(&resource_list);
>> + return 0;
>> + }
>> + count = 0;
>> + list_for_each_entry(rentry, &resource_list, node) {
>> + switch (resource_type(rentry->res)) {
>> + case IORESOURCE_MEM:
>> + if (!address_found) {
>> + dev->res = *rentry->res;
>> + address_found = true;
>> + }
>> + break;
>> + case IORESOURCE_IRQ:
>> + if (irq_no < AMBA_NR_IRQS)
>> + dev->irq[irq_no++] = rentry->res->start;
>> + break;
>> + default:
>> + dev_warn(&adev->dev, "Invalid resource\n");
>> + }
>> + }
>> + acpi_dev_free_resource_list(&resource_list);
>> + }
>> +
>> + /*
>> + * If the ACPI node has a parent and that parent has a physical device
>> + * attached to it, that physical device should be the parent of the
>> + * platform device we are about to create.
>> + */
>> + dev->dev.parent = NULL;
>> + acpi_parent = adev->parent;
>> + if (acpi_parent) {
>> + struct acpi_device_physical_node *entry;
>> + struct list_head *list;
>> +
>> + mutex_lock(&acpi_parent->physical_node_lock);
>> + list = &acpi_parent->physical_node_list;
>> + if (!list_empty(list)) {
>> + entry = list_first_entry(list,
>> + struct acpi_device_physical_node,
>> + node);
>> + dev->dev.parent = entry->dev;
>> + }
>> + mutex_unlock(&acpi_parent->physical_node_lock);
>> + }
>> +
>> + dev_set_name(&dev->dev, "%s", dev_name(&adev->dev));
>> + ACPI_COMPANION_SET(&dev->dev, adev);
>> +
>> + ret = amba_device_add(dev, &iomem_resource);
>> + if (ret) {
>> + pr_err("%s(): amba_device_add() failed (%d) for %s\n",
>> + __func__, ret, dev_name(&adev->dev));
>> + goto err_free;
>> + }
>> +
>> + return 1;
>> +
>> +err_free:
>> + amba_device_put(dev);
>> + return 0;
>> +}
>> +
>> +static struct acpi_scan_handler amba_handler = {
>> + .ids = amba_id_list,
>> + .attach = amba_handler_attach,
>> +};
>> +
>> +void __init acpi_amba_init(void)
>> +{
>> + acpi_scan_add_handler(&amba_handler);
>> +}
>> diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
>> index 11d87bf..9d58f0c 100644
>> --- a/drivers/acpi/internal.h
>> +++ b/drivers/acpi/internal.h
>> @@ -29,6 +29,11 @@ void acpi_processor_init(void);
>> void acpi_platform_init(void);
>> void acpi_pnp_init(void);
>> void acpi_int340x_thermal_init(void);
>> +#ifdef CONFIG_ARM_AMBA
>> +void acpi_amba_init(void);
>> +#else
>> +static inline void acpi_amba_init(void) {}
>> +#endif
>> int acpi_sysfs_init(void);
>> void acpi_container_init(void);
>> void acpi_memory_hotplug_init(void);
>> --
>> 2.6.4
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>> Please read the FAQ at http://www.tux.org/lkml/
>
>
>
> --
> With Best Regards,
> Andy Shevchenko
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v3 1/3] ACPI: amba bus probing support
2015-12-21 16:41 ` Aleksey Makarov
@ 2015-12-21 23:54 ` Vladimir Zapolskiy
-1 siblings, 0 replies; 18+ messages in thread
From: Vladimir Zapolskiy @ 2015-12-21 23:54 UTC (permalink / raw)
To: Aleksey Makarov, linux-acpi
Cc: Russell King, Graeme Gregory, Greg Kroah-Hartman,
Rafael J . Wysocki, linux-kernel, Shannon Zhao, linux-serial,
linux-arm-kernel, Len Brown
Hi,
On 21.12.2015 18:41, Aleksey Makarov wrote:
> From: Graeme Gregory <graeme.gregory@linaro.org>
>
> On ARM64 some devices use the AMBA device and not the platform bus for
> probing so add support for this. Uses a dummy clock for apb_pclk as ACPI
> does not have a suitable clock representation and to keep the core
> AMBA bus code unchanged between probing methods.
>
> Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
> Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org>
> ---
> drivers/acpi/Makefile | 1 +
> drivers/acpi/acpi_amba.c | 149 +++++++++++++++++++++++++++++++++++++++++++++++
> drivers/acpi/internal.h | 5 ++
> 3 files changed, 155 insertions(+)
> create mode 100644 drivers/acpi/acpi_amba.c
>
> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
> index 675eaf3..3cf732f 100644
> --- a/drivers/acpi/Makefile
> +++ b/drivers/acpi/Makefile
> @@ -43,6 +43,7 @@ acpi-y += pci_root.o pci_link.o pci_irq.o
> acpi-y += acpi_lpss.o acpi_apd.o
> acpi-y += acpi_platform.o
> acpi-y += acpi_pnp.o
> +acpi-$(CONFIG_ARM_AMBA) += acpi_amba.o
> acpi-y += int340x_thermal.o
> acpi-y += power.o
> acpi-y += event.o
> diff --git a/drivers/acpi/acpi_amba.c b/drivers/acpi/acpi_amba.c
> new file mode 100644
> index 0000000..ebc8913
> --- /dev/null
> +++ b/drivers/acpi/acpi_amba.c
> @@ -0,0 +1,149 @@
> +
> +/*
> + * ACPI support for platform bus type.
> + *
> + * Copyright (C) 2015, Linaro Ltd
> + * Authors: Graeme Gregory <graeme.gregory@linaro.org>
> + *
> + * 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/amba/bus.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk-provider.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/ioport.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +
> +#include "internal.h"
> +
> +static const struct acpi_device_id amba_id_list[] = {
> + {"ARMH0011", 0}, /* PL011 SBSA Uart */
> + {"ARMH0061", 0}, /* PL061 GPIO Device */
> + {"", 0},
> +};
> +
> +static struct clk *amba_dummy_clk;
> +
> +static void amba_register_dummy_clk(void)
> +{
> + struct clk *clk;
> +
> + /* If clock already registered */
> + if (amba_dummy_clk)
> + return;
> +
> + clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT, 0);
> + clk_register_clkdev(clk, "apb_pclk", NULL);
> +
> + amba_dummy_clk = clk;
> +}
> +
> +static int amba_handler_attach(struct acpi_device *adev,
> + const struct acpi_device_id *id)
> +{
> + struct amba_device *dev = NULL;
> + struct acpi_device *acpi_parent;
> + struct resource_entry *rentry;
> + struct list_head resource_list;
> + struct resource *resources = NULL;
> + bool address_found = false;
> + int ret, count, irq_no = 0;
> +
> + /* If the ACPI node already has a physical device attached, skip it. */
> + if (adev->physical_node_count)
> + return 0;
> +
> + amba_register_dummy_clk();
Since it is a single time dummy clock registration, may be it is better
to move it to acpi_amba_init() or somewhere else? I understand that
"apb_pclk" is wanted, but I'm not sure that this driver should serve as
a clock provider.
> + dev = amba_device_alloc(NULL, 0, 0);
> + if (!dev) {
> + pr_err("%s(): amba_device_alloc() failed for %s\n",
> + __func__, dev_name(&adev->dev));
> + return 0;
> + }
> +
> + INIT_LIST_HEAD(&resource_list);
> + count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
> + if (count < 0) {
> + return 0;
> + } else if (count > 0) {
if you return from one of two if-branches, please don't use if-else nesting
for another one.
> + resources = kmalloc_array(count, sizeof(struct resource),
> + GFP_KERNEL);
resources is never used and it is never freed, why do you allocate it?
> + if (!resources) {
> + acpi_dev_free_resource_list(&resource_list);
> + return 0;
return -ENOMEM; seems to be more appropriate here.
> + }
> + count = 0;
> + list_for_each_entry(rentry, &resource_list, node) {
> + switch (resource_type(rentry->res)) {
> + case IORESOURCE_MEM:
> + if (!address_found) {
> + dev->res = *rentry->res;
> + address_found = true;
> + }
> + break;
> + case IORESOURCE_IRQ:
> + if (irq_no < AMBA_NR_IRQS)
> + dev->irq[irq_no++] = rentry->res->start;
> + break;
> + default:
> + dev_warn(&adev->dev, "Invalid resource\n");
> + }
> + }
> + acpi_dev_free_resource_list(&resource_list);
> + }
> +
> + /*
> + * If the ACPI node has a parent and that parent has a physical device
> + * attached to it, that physical device should be the parent of the
> + * platform device we are about to create.
> + */
> + dev->dev.parent = NULL;
> + acpi_parent = adev->parent;
> + if (acpi_parent) {
> + struct acpi_device_physical_node *entry;
> + struct list_head *list;
> +
> + mutex_lock(&acpi_parent->physical_node_lock);
> + list = &acpi_parent->physical_node_list;
> + if (!list_empty(list)) {
> + entry = list_first_entry(list,
> + struct acpi_device_physical_node,
> + node);
> + dev->dev.parent = entry->dev;
> + }
> + mutex_unlock(&acpi_parent->physical_node_lock);
> + }
> +
> + dev_set_name(&dev->dev, "%s", dev_name(&adev->dev));
> + ACPI_COMPANION_SET(&dev->dev, adev);
> +
> + ret = amba_device_add(dev, &iomem_resource);
> + if (ret) {
> + pr_err("%s(): amba_device_add() failed (%d) for %s\n",
> + __func__, ret, dev_name(&adev->dev));
> + goto err_free;
> + }
> +
> + return 1;
> +
> +err_free:
> + amba_device_put(dev);
> + return 0;
> +}
> +
> +static struct acpi_scan_handler amba_handler = {
> + .ids = amba_id_list,
> + .attach = amba_handler_attach,
> +};
> +
> +void __init acpi_amba_init(void)
> +{
> + acpi_scan_add_handler(&amba_handler);
> +}
> diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
> index 11d87bf..9d58f0c 100644
> --- a/drivers/acpi/internal.h
> +++ b/drivers/acpi/internal.h
> @@ -29,6 +29,11 @@ void acpi_processor_init(void);
> void acpi_platform_init(void);
> void acpi_pnp_init(void);
> void acpi_int340x_thermal_init(void);
> +#ifdef CONFIG_ARM_AMBA
> +void acpi_amba_init(void);
> +#else
> +static inline void acpi_amba_init(void) {}
> +#endif
> int acpi_sysfs_init(void);
> void acpi_container_init(void);
> void acpi_memory_hotplug_init(void);
>
--
With best wishes,
Vladimir
^ permalink raw reply [flat|nested] 18+ messages in thread* [PATCH v3 1/3] ACPI: amba bus probing support
@ 2015-12-21 23:54 ` Vladimir Zapolskiy
0 siblings, 0 replies; 18+ messages in thread
From: Vladimir Zapolskiy @ 2015-12-21 23:54 UTC (permalink / raw)
To: linux-arm-kernel
Hi,
On 21.12.2015 18:41, Aleksey Makarov wrote:
> From: Graeme Gregory <graeme.gregory@linaro.org>
>
> On ARM64 some devices use the AMBA device and not the platform bus for
> probing so add support for this. Uses a dummy clock for apb_pclk as ACPI
> does not have a suitable clock representation and to keep the core
> AMBA bus code unchanged between probing methods.
>
> Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
> Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org>
> ---
> drivers/acpi/Makefile | 1 +
> drivers/acpi/acpi_amba.c | 149 +++++++++++++++++++++++++++++++++++++++++++++++
> drivers/acpi/internal.h | 5 ++
> 3 files changed, 155 insertions(+)
> create mode 100644 drivers/acpi/acpi_amba.c
>
> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
> index 675eaf3..3cf732f 100644
> --- a/drivers/acpi/Makefile
> +++ b/drivers/acpi/Makefile
> @@ -43,6 +43,7 @@ acpi-y += pci_root.o pci_link.o pci_irq.o
> acpi-y += acpi_lpss.o acpi_apd.o
> acpi-y += acpi_platform.o
> acpi-y += acpi_pnp.o
> +acpi-$(CONFIG_ARM_AMBA) += acpi_amba.o
> acpi-y += int340x_thermal.o
> acpi-y += power.o
> acpi-y += event.o
> diff --git a/drivers/acpi/acpi_amba.c b/drivers/acpi/acpi_amba.c
> new file mode 100644
> index 0000000..ebc8913
> --- /dev/null
> +++ b/drivers/acpi/acpi_amba.c
> @@ -0,0 +1,149 @@
> +
> +/*
> + * ACPI support for platform bus type.
> + *
> + * Copyright (C) 2015, Linaro Ltd
> + * Authors: Graeme Gregory <graeme.gregory@linaro.org>
> + *
> + * 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/amba/bus.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk-provider.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/ioport.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +
> +#include "internal.h"
> +
> +static const struct acpi_device_id amba_id_list[] = {
> + {"ARMH0011", 0}, /* PL011 SBSA Uart */
> + {"ARMH0061", 0}, /* PL061 GPIO Device */
> + {"", 0},
> +};
> +
> +static struct clk *amba_dummy_clk;
> +
> +static void amba_register_dummy_clk(void)
> +{
> + struct clk *clk;
> +
> + /* If clock already registered */
> + if (amba_dummy_clk)
> + return;
> +
> + clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT, 0);
> + clk_register_clkdev(clk, "apb_pclk", NULL);
> +
> + amba_dummy_clk = clk;
> +}
> +
> +static int amba_handler_attach(struct acpi_device *adev,
> + const struct acpi_device_id *id)
> +{
> + struct amba_device *dev = NULL;
> + struct acpi_device *acpi_parent;
> + struct resource_entry *rentry;
> + struct list_head resource_list;
> + struct resource *resources = NULL;
> + bool address_found = false;
> + int ret, count, irq_no = 0;
> +
> + /* If the ACPI node already has a physical device attached, skip it. */
> + if (adev->physical_node_count)
> + return 0;
> +
> + amba_register_dummy_clk();
Since it is a single time dummy clock registration, may be it is better
to move it to acpi_amba_init() or somewhere else? I understand that
"apb_pclk" is wanted, but I'm not sure that this driver should serve as
a clock provider.
> + dev = amba_device_alloc(NULL, 0, 0);
> + if (!dev) {
> + pr_err("%s(): amba_device_alloc() failed for %s\n",
> + __func__, dev_name(&adev->dev));
> + return 0;
> + }
> +
> + INIT_LIST_HEAD(&resource_list);
> + count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
> + if (count < 0) {
> + return 0;
> + } else if (count > 0) {
if you return from one of two if-branches, please don't use if-else nesting
for another one.
> + resources = kmalloc_array(count, sizeof(struct resource),
> + GFP_KERNEL);
resources is never used and it is never freed, why do you allocate it?
> + if (!resources) {
> + acpi_dev_free_resource_list(&resource_list);
> + return 0;
return -ENOMEM; seems to be more appropriate here.
> + }
> + count = 0;
> + list_for_each_entry(rentry, &resource_list, node) {
> + switch (resource_type(rentry->res)) {
> + case IORESOURCE_MEM:
> + if (!address_found) {
> + dev->res = *rentry->res;
> + address_found = true;
> + }
> + break;
> + case IORESOURCE_IRQ:
> + if (irq_no < AMBA_NR_IRQS)
> + dev->irq[irq_no++] = rentry->res->start;
> + break;
> + default:
> + dev_warn(&adev->dev, "Invalid resource\n");
> + }
> + }
> + acpi_dev_free_resource_list(&resource_list);
> + }
> +
> + /*
> + * If the ACPI node has a parent and that parent has a physical device
> + * attached to it, that physical device should be the parent of the
> + * platform device we are about to create.
> + */
> + dev->dev.parent = NULL;
> + acpi_parent = adev->parent;
> + if (acpi_parent) {
> + struct acpi_device_physical_node *entry;
> + struct list_head *list;
> +
> + mutex_lock(&acpi_parent->physical_node_lock);
> + list = &acpi_parent->physical_node_list;
> + if (!list_empty(list)) {
> + entry = list_first_entry(list,
> + struct acpi_device_physical_node,
> + node);
> + dev->dev.parent = entry->dev;
> + }
> + mutex_unlock(&acpi_parent->physical_node_lock);
> + }
> +
> + dev_set_name(&dev->dev, "%s", dev_name(&adev->dev));
> + ACPI_COMPANION_SET(&dev->dev, adev);
> +
> + ret = amba_device_add(dev, &iomem_resource);
> + if (ret) {
> + pr_err("%s(): amba_device_add() failed (%d) for %s\n",
> + __func__, ret, dev_name(&adev->dev));
> + goto err_free;
> + }
> +
> + return 1;
> +
> +err_free:
> + amba_device_put(dev);
> + return 0;
> +}
> +
> +static struct acpi_scan_handler amba_handler = {
> + .ids = amba_id_list,
> + .attach = amba_handler_attach,
> +};
> +
> +void __init acpi_amba_init(void)
> +{
> + acpi_scan_add_handler(&amba_handler);
> +}
> diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
> index 11d87bf..9d58f0c 100644
> --- a/drivers/acpi/internal.h
> +++ b/drivers/acpi/internal.h
> @@ -29,6 +29,11 @@ void acpi_processor_init(void);
> void acpi_platform_init(void);
> void acpi_pnp_init(void);
> void acpi_int340x_thermal_init(void);
> +#ifdef CONFIG_ARM_AMBA
> +void acpi_amba_init(void);
> +#else
> +static inline void acpi_amba_init(void) {}
> +#endif
> int acpi_sysfs_init(void);
> void acpi_container_init(void);
> void acpi_memory_hotplug_init(void);
>
--
With best wishes,
Vladimir
^ permalink raw reply [flat|nested] 18+ messages in thread* Re: [PATCH v3 1/3] ACPI: amba bus probing support
2015-12-21 23:54 ` Vladimir Zapolskiy
@ 2015-12-22 9:47 ` Andy Shevchenko
-1 siblings, 0 replies; 18+ messages in thread
From: Andy Shevchenko @ 2015-12-22 9:47 UTC (permalink / raw)
To: Vladimir Zapolskiy
Cc: Aleksey Makarov, linux-acpi, Russell King, Graeme Gregory,
Greg Kroah-Hartman, Rafael J . Wysocki, linux-kernel,
Shannon Zhao, linux-serial, linux-arm Mailing List, Len Brown
On Tue, Dec 22, 2015 at 1:54 AM, Vladimir Zapolskiy <vz@mleia.com> wrote:
> On 21.12.2015 18:41, Aleksey Makarov wrote:
>> +static int amba_handler_attach(struct acpi_device *adev,
>> + const struct acpi_device_id *id)
>> +{
>> + struct amba_device *dev = NULL;
>> + struct acpi_device *acpi_parent;
>> + struct resource_entry *rentry;
>> + struct list_head resource_list;
>> + struct resource *resources = NULL;
>> + bool address_found = false;
>> + int ret, count, irq_no = 0;
>> +
>> + /* If the ACPI node already has a physical device attached, skip it. */
>> + if (adev->physical_node_count)
>> + return 0;
>> +
>> + amba_register_dummy_clk();
>
> Since it is a single time dummy clock registration, may be it is better
> to move it to acpi_amba_init() or somewhere else? I understand that
> "apb_pclk" is wanted, but I'm not sure that this driver should serve as
> a clock provider.
Depends on actual hardware topology. Intel HW has few drivers that are
clock providers because they are really ones.
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 18+ messages in thread* [PATCH v3 1/3] ACPI: amba bus probing support
@ 2015-12-22 9:47 ` Andy Shevchenko
0 siblings, 0 replies; 18+ messages in thread
From: Andy Shevchenko @ 2015-12-22 9:47 UTC (permalink / raw)
To: linux-arm-kernel
On Tue, Dec 22, 2015 at 1:54 AM, Vladimir Zapolskiy <vz@mleia.com> wrote:
> On 21.12.2015 18:41, Aleksey Makarov wrote:
>> +static int amba_handler_attach(struct acpi_device *adev,
>> + const struct acpi_device_id *id)
>> +{
>> + struct amba_device *dev = NULL;
>> + struct acpi_device *acpi_parent;
>> + struct resource_entry *rentry;
>> + struct list_head resource_list;
>> + struct resource *resources = NULL;
>> + bool address_found = false;
>> + int ret, count, irq_no = 0;
>> +
>> + /* If the ACPI node already has a physical device attached, skip it. */
>> + if (adev->physical_node_count)
>> + return 0;
>> +
>> + amba_register_dummy_clk();
>
> Since it is a single time dummy clock registration, may be it is better
> to move it to acpi_amba_init() or somewhere else? I understand that
> "apb_pclk" is wanted, but I'm not sure that this driver should serve as
> a clock provider.
Depends on actual hardware topology. Intel HW has few drivers that are
clock providers because they are really ones.
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 18+ messages in thread