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mailbox: apple: Implement poll_data() operation

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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>
This commit is contained in:
Hector Martin 2022-09-14 09:34:26 +01:00 committed by Jassi Brar
parent 38ed8c888e
commit 68584e380e
1 changed files with 33 additions and 3 deletions
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36
drivers/mailbox/apple-mailbox.c
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@ -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)