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platform/chrome: pstore: probe for ramoops buffer using acpi

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In order to handle the firmware placing the ramoops buffer
in a different location than the kernel is configured to look
probe for an ACPI device specified by GOOG9999 acpi id. If
no device is found or the first memory resource is not defined
properly fall back to the configured base and length.

Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Signed-off-by: Ben Zhang <benzh@chromium.org>
Signed-off-by: Filipe Brandenburger <filbranden@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Olof Johansson <olofj@chromium.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Aaron Durbin 2016-02-16 08:25:15 +01:00 committed by Olof Johansson
parent bff3c624dc
commit 59a356d2f1
1 changed files with 52 additions and 1 deletions
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53
drivers/platform/chrome/chromeos_pstore.c
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@ -8,6 +8,7 @@
* the Free Software Foundation, version 2 of the License.
*/
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/platform_device.h>
@ -71,9 +72,59 @@ static struct platform_device chromeos_ramoops = {
},
};
#ifdef CONFIG_ACPI
static const struct acpi_device_id cros_ramoops_acpi_match[] = {
{ "GOOG9999", 0 },
{ }
};
MODULE_DEVICE_TABLE(acpi, cros_ramoops_acpi_match);
static struct platform_driver chromeos_ramoops_acpi = {
.driver = {
.name = "chromeos_pstore",
.acpi_match_table = ACPI_PTR(cros_ramoops_acpi_match),
},
};
static int __init chromeos_probe_acpi(struct platform_device *pdev)
{
struct resource *res;
resource_size_t len;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENOMEM;
len = resource_size(res);
if (!res->start || !len)
return -ENOMEM;
pr_info("chromeos ramoops using acpi device.\n");
chromeos_ramoops_data.mem_size = len;
chromeos_ramoops_data.mem_address = res->start;
return 0;
}
static bool __init chromeos_check_acpi(void)
{
if (!platform_driver_probe(&chromeos_ramoops_acpi, chromeos_probe_acpi))
return true;
return false;
}
#else
static inline bool chromeos_check_acpi(void) { return false; }
#endif
static int __init chromeos_pstore_init(void)
{
if (dmi_check_system(chromeos_pstore_dmi_table))
bool acpi_dev_found;
/* First check ACPI for non-hardcoded values from firmware. */
acpi_dev_found = chromeos_check_acpi();
if (acpi_dev_found || dmi_check_system(chromeos_pstore_dmi_table))
return platform_device_register(&chromeos_ramoops);
return -ENODEV;