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mailbox: add no_irq send message

For debug purpose, mailbox must be available when
interrupts are disabled to collect dump information.

Signed-off-by: Loic Pallardy <loic.pallardy@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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ydrallap authored and sumananna committed Jan 31, 2013
1 parent 8daddb5 commit 84442338e7abfa6dac72ea88980c3ac3a729b801
Showing with 69 additions and 0 deletions.
  1. +66 −0 drivers/mailbox/mailbox.c
  2. +3 −0 include/linux/mailbox.h
View
@@ -110,6 +110,72 @@ int mailbox_msg_send(struct mailbox *mbox, struct mailbox_msg *msg)
}
EXPORT_SYMBOL(mailbox_msg_send);
+#define TRANSFER_TIMEOUT 30000 /* Becomes ~3s timeout */
+
+static struct mailbox_msg no_irq_msg_res;
+
+struct mailbox_msg *mailbox_msg_send_receive_no_irq(struct mailbox *mbox,
+ struct mailbox_msg *msg)
+{
+ int ret = 0;
+ int count = 0;
+
+ BUG_ON(!irqs_disabled());
+
+ if (likely(mbox->ops->write && mbox->ops->read)) {
+ if (__mbox_poll_for_space(mbox)) {
+ ret = -EBUSY;
+ goto out;
+ }
+ mbox->ops->write(mbox, msg);
+ while (!is_mbox_irq(mbox, IRQ_RX)) {
+ udelay(100);
+ cpu_relax();
+ count++;
+ if (count > TRANSFER_TIMEOUT) {
+ pr_err("%s: Error: transfer timed out\n",
+ __func__);
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+ mbox->ops->read(mbox, &no_irq_msg_res);
+ ack_mbox_irq(mbox, IRQ_RX);
+ } else {
+ ret = -EINVAL;
+ }
+
+out:
+ BUG_ON(ret < 0);
+
+ return &no_irq_msg_res;
+}
+EXPORT_SYMBOL(mailbox_msg_send_receive_no_irq);
+
+int mailbox_msg_send_no_irq(struct mailbox *mbox,
+ struct mailbox_msg *msg)
+{
+ int ret = 0;
+
+ BUG_ON(!irqs_disabled());
+
+ if (likely(mbox->ops->write)) {
+ if (__mbox_poll_for_space(mbox)) {
+ ret = -EBUSY;
+ goto out;
+ }
+ mbox->ops->write(mbox, msg);
+ } else {
+ ret = -EINVAL;
+ }
+
+out:
+ WARN_ON(ret < 0);
+
+ return ret;
+}
+EXPORT_SYMBOL(mailbox_msg_send_no_irq);
+
void mailbox_save_ctx(struct mailbox *mbox)
{
if (!mbox->ops->save_ctx) {
View
@@ -29,6 +29,9 @@ struct mailbox_msg {
}
int mailbox_msg_send(struct mailbox *, struct mailbox_msg *msg);
+struct mailbox_msg *mailbox_msg_send_receive_no_irq(struct mailbox *,
+ struct mailbox_msg *msg);
+int mailbox_msg_send_no_irq(struct mailbox *, struct mailbox_msg *msg);
struct mailbox *mailbox_get(const char *, struct notifier_block *nb);
void mailbox_put(struct mailbox *mbox, struct notifier_block *nb);

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