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Message-Id: <1339531019-17040-1-git-send-email-bfreed@chromium.org>
Date: Tue, 12 Jun 2012 12:56:59 -0700
From: Bryan Freed <bfreed@...omium.org>
To: linux-kernel@...r.kernel.org
Cc: olof@...om.net, keescook@...omium.org, marco.stornelli@...il.com,
grant.likely@...retlab.ca, anton.vorontsov@...aro.org,
Bryan Freed <bfreed@...omium.org>
Subject: [PATCH v4] pstore/ram: Add ramoops support for the Flattened Device Tree.
When called with a non-zero of_node, fill out a new ramoops_platform_data
with data from the specified Flattened Device Tree node.
Update ramoops documentation with the new FDT interface.
Update devicetree/binding documentation with pstore/ramoops.txt.
Signed-off-by: Bryan Freed <bfreed@...omium.org>
---
.../devicetree/bindings/pstore/ramoops.txt | 17 ++++++++
Documentation/ramoops.txt | 7 ++-
fs/pstore/ram.c | 40 ++++++++++++++++++++
3 files changed, 62 insertions(+), 2 deletions(-)
create mode 100644 Documentation/devicetree/bindings/pstore/ramoops.txt
diff --git a/Documentation/devicetree/bindings/pstore/ramoops.txt b/Documentation/devicetree/bindings/pstore/ramoops.txt
new file mode 100644
index 0000000..4590c5d
--- /dev/null
+++ b/Documentation/devicetree/bindings/pstore/ramoops.txt
@@ -0,0 +1,17 @@
+Ramoops oops/panic logger
+
+Required properties:
+- compatible: Must be "ramoops".
+- reg: Specifies the base physical address and size of preserved memory.
+- record-size: Specifies the size of each record in preserved memory.
+
+Example:
+
+ramoops {
+ compatible = "ramoops";
+ reg = <0x41f00000 0x00100000>;
+ record-size = <0x00020000>;
+};
+The "reg = <0x41f00000 0x00100000>" line specifies a preserved memory
+size of 1MB at physical address 0x41f00000.
+The "record-size = <0x00020000>" line specifies a record size of 128KB.
diff --git a/Documentation/ramoops.txt b/Documentation/ramoops.txt
index 4ba7db2..80a6173 100644
--- a/Documentation/ramoops.txt
+++ b/Documentation/ramoops.txt
@@ -3,7 +3,7 @@ Ramoops oops/panic logger
Sergiu Iordache <sergiu@...omium.org>
-Updated: 17 November 2011
+Updated: 5 June 2012
0. Introduction
@@ -37,7 +37,7 @@ corrupt, but usually it is restorable.
2. Setting the parameters
-Setting the ramoops parameters can be done in 2 different manners:
+Setting the ramoops parameters can be done in 3 different manners:
1. Use the module parameters (which have the names of the variables described
as before).
2. Use a platform device and set the platform data. The parameters can then
@@ -70,6 +70,9 @@ if (ret) {
return ret;
}
+ 3. Use the Flattened Device Tree to set the platform data.
+ This is described in devicetree/bindings/pstore/ramoops.txt.
+
3. Dump format
The data dump begins with a header, currently defined as "====" followed by a
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 9123cce..feeef9b 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -32,6 +32,7 @@
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/pstore_ram.h>
+#include <linux/of_address.h>
#define RAMOOPS_KERNMSG_HDR "===="
#define MIN_MEM_SIZE 4096UL
@@ -199,10 +200,34 @@ static struct ramoops_context oops_cxt = {
},
};
+static int __init of_ramoops_platform_data(struct device_node *node,
+ struct ramoops_platform_data *pdata)
+{
+ const __be32 *addrp;
+ const __be32 *prop;
+ u64 size;
+
+ memset(pdata, 0, sizeof(*pdata));
+
+ addrp = of_get_address(node, 0, &size, NULL);
+ if (addrp == NULL)
+ return -EINVAL;
+ pdata->mem_address = of_translate_address(node, addrp);
+ pdata->mem_size = size;
+
+ prop = of_get_property(node, "record-size", NULL);
+ if (!prop)
+ return -EINVAL;
+ pdata->record_size = be32_to_cpup(prop);
+
+ return 0;
+}
+
static int __init ramoops_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ramoops_platform_data *pdata = pdev->dev.platform_data;
+ struct ramoops_platform_data of_pdata;
struct ramoops_context *cxt = &oops_cxt;
int err = -EINVAL;
int i;
@@ -213,6 +238,14 @@ static int __init ramoops_probe(struct platform_device *pdev)
if (cxt->max_count)
goto fail_out;
+ if (pdev->dev.of_node) {
+ if (of_ramoops_platform_data(pdev->dev.of_node, &of_pdata)) {
+ pr_err("Invalid ramoops device tree data\n");
+ goto fail_out;
+ }
+ pdata = &of_pdata;
+ }
+
if (!pdata->mem_size || !pdata->record_size) {
pr_err("The memory size and the record size must be "
"non-zero\n");
@@ -329,11 +362,18 @@ static int __exit ramoops_remove(struct platform_device *pdev)
return -EBUSY;
}
+static const struct of_device_id ramoops_of_match[] = {
+ { .compatible = "ramoops", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, ramoops_of_match);
+
static struct platform_driver ramoops_driver = {
.remove = __exit_p(ramoops_remove),
.driver = {
.name = "ramoops",
.owner = THIS_MODULE,
+ .of_match_table = ramoops_of_match,
},
};
--
1.7.7.3
--
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