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path: root/kernel/drivers/mailbox/omap-mailbox.c
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Diffstat (limited to 'kernel/drivers/mailbox/omap-mailbox.c')
-rw-r--r--kernel/drivers/mailbox/omap-mailbox.c57
1 files changed, 49 insertions, 8 deletions
diff --git a/kernel/drivers/mailbox/omap-mailbox.c b/kernel/drivers/mailbox/omap-mailbox.c
index 0f332c178..b7f636f15 100644
--- a/kernel/drivers/mailbox/omap-mailbox.c
+++ b/kernel/drivers/mailbox/omap-mailbox.c
@@ -38,6 +38,8 @@
#include <linux/mailbox_controller.h>
#include <linux/mailbox_client.h>
+#include "mailbox.h"
+
#define MAILBOX_REVISION 0x000
#define MAILBOX_MESSAGE(m) (0x040 + 4 * (m))
#define MAILBOX_FIFOSTATUS(m) (0x080 + 4 * (m))
@@ -106,6 +108,7 @@ struct omap_mbox_fifo_info {
int rx_irq;
const char *name;
+ bool send_no_irq;
};
struct omap_mbox {
@@ -119,6 +122,7 @@ struct omap_mbox {
u32 ctx[OMAP4_MBOX_NR_REGS];
u32 intr_type;
struct mbox_chan *chan;
+ bool send_no_irq;
};
/* global variables for the mailbox devices */
@@ -418,6 +422,9 @@ static int omap_mbox_startup(struct omap_mbox *mbox)
goto fail_request_irq;
}
+ if (mbox->send_no_irq)
+ mbox->chan->txdone_method = TXDONE_BY_ACK;
+
_omap_mbox_enable_irq(mbox, IRQ_RX);
return 0;
@@ -586,13 +593,27 @@ static void omap_mbox_chan_shutdown(struct mbox_chan *chan)
mutex_unlock(&mdev->cfg_lock);
}
-static int omap_mbox_chan_send_data(struct mbox_chan *chan, void *data)
+static int omap_mbox_chan_send_noirq(struct omap_mbox *mbox, void *data)
{
- struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
int ret = -EBUSY;
- if (!mbox)
- return -EINVAL;
+ if (!mbox_fifo_full(mbox)) {
+ _omap_mbox_enable_irq(mbox, IRQ_RX);
+ mbox_fifo_write(mbox, (mbox_msg_t)data);
+ ret = 0;
+ _omap_mbox_disable_irq(mbox, IRQ_RX);
+
+ /* we must read and ack the interrupt directly from here */
+ mbox_fifo_read(mbox);
+ ack_mbox_irq(mbox, IRQ_RX);
+ }
+
+ return ret;
+}
+
+static int omap_mbox_chan_send(struct omap_mbox *mbox, void *data)
+{
+ int ret = -EBUSY;
if (!mbox_fifo_full(mbox)) {
mbox_fifo_write(mbox, (mbox_msg_t)data);
@@ -604,7 +625,23 @@ static int omap_mbox_chan_send_data(struct mbox_chan *chan, void *data)
return ret;
}
-static struct mbox_chan_ops omap_mbox_chan_ops = {
+static int omap_mbox_chan_send_data(struct mbox_chan *chan, void *data)
+{
+ struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
+ int ret;
+
+ if (!mbox)
+ return -EINVAL;
+
+ if (mbox->send_no_irq)
+ ret = omap_mbox_chan_send_noirq(mbox, data);
+ else
+ ret = omap_mbox_chan_send(mbox, data);
+
+ return ret;
+}
+
+static const struct mbox_chan_ops omap_mbox_chan_ops = {
.startup = omap_mbox_chan_startup,
.send_data = omap_mbox_chan_send_data,
.shutdown = omap_mbox_chan_shutdown,
@@ -639,18 +676,18 @@ static struct mbox_chan *omap_mbox_of_xlate(struct mbox_controller *controller,
mdev = container_of(controller, struct omap_mbox_device, controller);
if (WARN_ON(!mdev))
- return NULL;
+ return ERR_PTR(-EINVAL);
node = of_find_node_by_phandle(phandle);
if (!node) {
pr_err("%s: could not find node phandle 0x%x\n",
__func__, phandle);
- return NULL;
+ return ERR_PTR(-ENODEV);
}
mbox = omap_mbox_device_find(mdev, node->name);
of_node_put(node);
- return mbox ? mbox->chan : NULL;
+ return mbox ? mbox->chan : ERR_PTR(-ENOENT);
}
static int omap_mbox_probe(struct platform_device *pdev)
@@ -732,6 +769,9 @@ static int omap_mbox_probe(struct platform_device *pdev)
finfo->rx_usr = tmp[2];
finfo->name = child->name;
+
+ if (of_find_property(child, "ti,mbox-send-noirq", NULL))
+ finfo->send_no_irq = true;
} else {
finfo->tx_id = info->tx_id;
finfo->rx_id = info->rx_id;
@@ -791,6 +831,7 @@ static int omap_mbox_probe(struct platform_device *pdev)
fifo->irqstatus = MAILBOX_IRQSTATUS(intr_type, finfo->rx_usr);
fifo->irqdisable = MAILBOX_IRQDISABLE(intr_type, finfo->rx_usr);
+ mbox->send_no_irq = finfo->send_no_irq;
mbox->intr_type = intr_type;
mbox->parent = mdev;