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coresight: stm: ACPI support for parsing stimulus base 

The stimulus base for STM device must be listed as the second memory
resource, followed by the programming base address as described in
"Section 2.3 Resources" in ACPI for CoreSightTM 1.0 Platform Design
documen (DEN0067).

Add support for parsing the information for ACPI.

Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
alistair/sunxi64-5.4-dsi
Suzuki K Poulose 2019-06-19 13:53:05 -06:00 committed by Greg Kroah-Hartman
parent 0f5f9b6ba9
commit 68c0dacb88
1 changed files with 52 additions and 1 deletions
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53
drivers/hwtracing/coresight/coresight-stm.c
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@ -16,6 +16,7 @@
* (C) 2015-2016 Chunyan Zhang <zhang.chunyan@linaro.org>
*/
#include <asm/local.h>
#include <linux/acpi.h>
#include <linux/amba/bus.h>
#include <linux/bitmap.h>
#include <linux/clk.h>
@ -716,10 +717,60 @@ static inline int of_stm_get_stimulus_area(struct device *dev,
}
#endif
#ifdef CONFIG_ACPI
static int acpi_stm_get_stimulus_area(struct device *dev, struct resource *res)
{
int rc;
bool found_base = false;
struct resource_entry *rent;
LIST_HEAD(res_list);
struct acpi_device *adev = ACPI_COMPANION(dev);
if (!adev)
return -ENODEV;
rc = acpi_dev_get_resources(adev, &res_list, NULL, NULL);
if (rc < 0)
return rc;
/*
* The stimulus base for STM device must be listed as the second memory
* resource, followed by the programming base address as described in
* "Section 2.3 Resources" in ACPI for CoreSightTM 1.0 Platform Design
* document (DEN0067).
*/
rc = -ENOENT;
list_for_each_entry(rent, &res_list, node) {
if (resource_type(rent->res) != IORESOURCE_MEM)
continue;
if (found_base) {
*res = *rent->res;
rc = 0;
break;
}
found_base = true;
}
acpi_dev_free_resource_list(&res_list);
return rc;
}
#else
static inline int acpi_stm_get_stimulus_area(struct device *dev,
struct resource *res)
{
return -ENOENT;
}
#endif
static int stm_get_stimulus_area(struct device *dev, struct resource *res)
{
if (is_of_node(dev_fwnode(dev)))
struct fwnode_handle *fwnode = dev_fwnode(dev);
if (is_of_node(fwnode))
return of_stm_get_stimulus_area(dev, res);
else if (is_acpi_node(fwnode))
return acpi_stm_get_stimulus_area(dev, res);
return -ENOENT;
}