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authorGeoff Levand <geoffrey.levand@am.sony.com>2007-10-07 07:35:47 +1000
committerPaul Mackerras <paulus@samba.org>2007-10-09 21:01:59 +1000
commit7db19421a9b116a196845a1118729cf5988f1b57 (patch)
treea55e55e2506a1e21336d6b36d09652c774e4e206 /arch/powerpc/platforms/ps3/os-area.c
parentd7b98e3dd87b4512462f6cdfe646a8e59673e62e (diff)
downloadlinux-linaro-stable-7db19421a9b116a196845a1118729cf5988f1b57.tar.gz
[POWERPC] PS3: Save os-area params to device tree
Add the PS3 os-area startup params to the device tree. This allows a second stage kernel loaded with kexec to use these values. Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/platforms/ps3/os-area.c')
-rw-r--r--arch/powerpc/platforms/ps3/os-area.c104
1 files changed, 102 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/ps3/os-area.c b/arch/powerpc/platforms/ps3/os-area.c
index 473aee8580ce..e50a276fcf67 100644
--- a/arch/powerpc/platforms/ps3/os-area.c
+++ b/arch/powerpc/platforms/ps3/os-area.c
@@ -119,10 +119,65 @@ struct os_area_params {
*/
struct saved_params {
+ unsigned int valid;
s64 rtc_diff;
unsigned int av_multi_out;
} static saved_params;
+static struct property property_rtc_diff = {
+ .name = "linux,rtc_diff",
+ .length = sizeof(saved_params.rtc_diff),
+ .value = &saved_params.rtc_diff,
+};
+
+static struct property property_av_multi_out = {
+ .name = "linux,av_multi_out",
+ .length = sizeof(saved_params.av_multi_out),
+ .value = &saved_params.av_multi_out,
+};
+
+/**
+ * os_area_set_property - Add or overwrite a saved_params value to the device tree.
+ *
+ * Overwrites an existing property.
+ */
+
+static void os_area_set_property(struct device_node *node,
+ struct property *prop)
+{
+ int result;
+ struct property *tmp = of_find_property(node, prop->name, NULL);
+
+ if (tmp) {
+ pr_debug("%s:%d found %s\n", __func__, __LINE__, prop->name);
+ prom_remove_property(node, tmp);
+ }
+
+ result = prom_add_property(node, prop);
+
+ if (result)
+ pr_debug("%s:%d prom_set_property failed\n", __func__,
+ __LINE__);
+}
+
+/**
+ * os_area_get_property - Get a saved_params value from the device tree.
+ *
+ */
+
+static void __init os_area_get_property(struct device_node *node,
+ struct property *prop)
+{
+ const struct property *tmp = of_find_property(node, prop->name, NULL);
+
+ if (tmp) {
+ BUG_ON(prop->length != tmp->length);
+ memcpy(prop->value, tmp->value, prop->length);
+ } else
+ pr_debug("%s:%d not found %s\n", __func__, __LINE__,
+ prop->name);
+}
+
#define dump_header(_a) _dump_header(_a, __func__, __LINE__)
static void _dump_header(const struct os_area_header *h, const char *func,
int line)
@@ -196,8 +251,19 @@ static int __init verify_header(const struct os_area_header *header)
static void os_area_queue_work_handler(struct work_struct *work)
{
+ struct device_node *node;
+
pr_debug(" -> %s:%d\n", __func__, __LINE__);
+ node = of_find_node_by_path("/");
+
+ if (node) {
+ os_area_set_property(node, &property_rtc_diff);
+ of_node_put(node);
+ } else
+ pr_debug("%s:%d of_find_node_by_path failed\n",
+ __func__, __LINE__);
+
pr_debug(" <- %s:%d\n", __func__, __LINE__);
}
@@ -244,6 +310,8 @@ void __init ps3_os_area_save_params(void)
result = verify_header(header);
if (result) {
+ /* Second stage kernels exit here. */
+
pr_debug("%s:%d verify_header failed\n", __func__, __LINE__);
dump_header(header);
return;
@@ -254,6 +322,7 @@ void __init ps3_os_area_save_params(void)
saved_params.rtc_diff = params->rtc_diff;
saved_params.av_multi_out = params->av_multi_out;
+ saved_params.valid = 1;
memset(header, 0, sizeof(*header));
@@ -261,13 +330,44 @@ void __init ps3_os_area_save_params(void)
}
/**
+ * ps3_os_area_init - Setup os area device tree properties as needed.
+ */
+
+void __init ps3_os_area_init(void)
+{
+ struct device_node *node;
+
+ pr_debug(" -> %s:%d\n", __func__, __LINE__);
+
+ node = of_find_node_by_path("/");
+
+ if (!saved_params.valid && node) {
+ /* Second stage kernels should have a dt entry. */
+ os_area_get_property(node, &property_rtc_diff);
+ os_area_get_property(node, &property_av_multi_out);
+ }
+
+ if(!saved_params.rtc_diff)
+ saved_params.rtc_diff = SECONDS_FROM_1970_TO_2000;
+
+ if (node) {
+ os_area_set_property(node, &property_rtc_diff);
+ os_area_set_property(node, &property_av_multi_out);
+ of_node_put(node);
+ } else
+ pr_debug("%s:%d of_find_node_by_path failed\n",
+ __func__, __LINE__);
+
+ pr_debug(" <- %s:%d\n", __func__, __LINE__);
+}
+
+/**
* ps3_os_area_get_rtc_diff - Returns the rtc diff value.
*/
u64 ps3_os_area_get_rtc_diff(void)
{
- return saved_params.rtc_diff ? saved_params.rtc_diff
- : SECONDS_FROM_1970_TO_2000;
+ return saved_params.rtc_diff;
}
/**