diff options
| author | Hector Martin <marcan@marcan.st> | 2022-09-14 10:34:26 +0200 |
|---|---|---|
| committer | Jassi Brar <jaswinder.singh@linaro.org> | 2022-09-15 20:14:01 +0200 |
| commit | 68584e380ef54fb1e7d97710a0fdd7e31212fd65 (patch) | |
| tree | b97c0bdc02b80d758b100fe404e980c55a7d2560 /drivers/mailbox | |
| parent | mailbox: apple: Implement flush() operation (diff) | |
| download | linux-68584e380ef54fb1e7d97710a0fdd7e31212fd65.tar.xz linux-68584e380ef54fb1e7d97710a0fdd7e31212fd65.zip | |
mailbox: apple: Implement poll_data() operation
This allows clients running in atomic context to poll for messages to
arrive.
Signed-off-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Diffstat (limited to 'drivers/mailbox')
| -rw-r--r-- | drivers/mailbox/apple-mailbox.c | 36 |
1 files changed, 33 insertions, 3 deletions
diff --git a/drivers/mailbox/apple-mailbox.c b/drivers/mailbox/apple-mailbox.c index 33e7acf71e3e..2a3e8d8ff8b5 100644 --- a/drivers/mailbox/apple-mailbox.c +++ b/drivers/mailbox/apple-mailbox.c @@ -26,6 +26,7 @@ #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> +#include <linux/spinlock.h> #include <linux/types.h> #define APPLE_ASC_MBOX_CONTROL_FULL BIT(16) @@ -101,6 +102,7 @@ struct apple_mbox { struct device *dev; struct mbox_controller controller; + spinlock_t rx_lock; }; static const struct of_device_id apple_mbox_of_match[]; @@ -204,13 +206,15 @@ static irqreturn_t apple_mbox_send_empty_irq(int irq, void *data) return IRQ_HANDLED; } -static irqreturn_t apple_mbox_recv_irq(int irq, void *data) +static int apple_mbox_poll(struct apple_mbox *apple_mbox) { - struct apple_mbox *apple_mbox = data; struct apple_mbox_msg msg; + int ret = 0; - while (apple_mbox_hw_recv(apple_mbox, &msg) == 0) + while (apple_mbox_hw_recv(apple_mbox, &msg) == 0) { mbox_chan_received_data(&apple_mbox->chan, (void *)&msg); + ret++; + } /* * The interrupt will keep firing even if there are no more messages @@ -225,9 +229,33 @@ static irqreturn_t apple_mbox_recv_irq(int irq, void *data) apple_mbox->regs + apple_mbox->hw->irq_ack); } + return ret; +} + +static irqreturn_t apple_mbox_recv_irq(int irq, void *data) +{ + struct apple_mbox *apple_mbox = data; + + spin_lock(&apple_mbox->rx_lock); + apple_mbox_poll(apple_mbox); + spin_unlock(&apple_mbox->rx_lock); + return IRQ_HANDLED; } +static bool apple_mbox_chan_peek_data(struct mbox_chan *chan) +{ + struct apple_mbox *apple_mbox = chan->con_priv; + unsigned long flags; + int ret; + + spin_lock_irqsave(&apple_mbox->rx_lock, flags); + ret = apple_mbox_poll(apple_mbox); + spin_unlock_irqrestore(&apple_mbox->rx_lock, flags); + + return ret > 0; +} + static int apple_mbox_chan_flush(struct mbox_chan *chan, unsigned long timeout) { struct apple_mbox *apple_mbox = chan->con_priv; @@ -276,6 +304,7 @@ static void apple_mbox_chan_shutdown(struct mbox_chan *chan) static const struct mbox_chan_ops apple_mbox_ops = { .send_data = apple_mbox_chan_send_data, + .peek_data = apple_mbox_chan_peek_data, .flush = apple_mbox_chan_flush, .startup = apple_mbox_chan_startup, .shutdown = apple_mbox_chan_shutdown, @@ -331,6 +360,7 @@ static int apple_mbox_probe(struct platform_device *pdev) mbox->controller.txdone_irq = true; mbox->controller.of_xlate = apple_mbox_of_xlate; mbox->chan.con_priv = mbox; + spin_lock_init(&mbox->rx_lock); irqname = devm_kasprintf(dev, GFP_KERNEL, "%s-recv", dev_name(dev)); if (!irqname) |