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tty/hvc_opal: Kick the HVC thread on OPAL console events

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The firmware can notify us when new input data is available, so
let's make sure we wakeup the HVC thread in that case.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2014-03-28 13:36:32 +11:00
parent 798af00c4d
commit 32b941b793
1 changed files with 21 additions and 1 deletions
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22
drivers/tty/hvc/hvc_opal.c
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@ -61,6 +61,7 @@ static struct hvc_opal_priv *hvc_opal_privs[MAX_NR_HVC_CONSOLES];
/* For early boot console */
static struct hvc_opal_priv hvc_opal_boot_priv;
static u32 hvc_opal_boot_termno;
static bool hvc_opal_event_registered;
static const struct hv_ops hvc_opal_raw_ops = {
.get_chars = opal_get_chars,
@ -161,6 +162,18 @@ static const struct hv_ops hvc_opal_hvsi_ops = {
.tiocmset = hvc_opal_hvsi_tiocmset,
};
static int hvc_opal_console_event(struct notifier_block *nb,
unsigned long events, void *change)
{
if (events & OPAL_EVENT_CONSOLE_INPUT)
hvc_kick();
return 0;
}
static struct notifier_block hvc_opal_console_nb = {
.notifier_call = hvc_opal_console_event,
};
static int hvc_opal_probe(struct platform_device *dev)
{
const struct hv_ops *ops;
@ -170,6 +183,7 @@ static int hvc_opal_probe(struct platform_device *dev)
unsigned int termno, boot = 0;
const __be32 *reg;
if (of_device_is_compatible(dev->dev.of_node, "ibm,opal-console-raw")) {
proto = HV_PROTOCOL_RAW;
ops = &hvc_opal_raw_ops;
@ -213,12 +227,18 @@ static int hvc_opal_probe(struct platform_device *dev)
dev->dev.of_node->full_name,
boot ? " (boot console)" : "");
/* We don't do IRQ yet */
/* We don't do IRQ ... */
hp = hvc_alloc(termno, 0, ops, MAX_VIO_PUT_CHARS);
if (IS_ERR(hp))
return PTR_ERR(hp);
dev_set_drvdata(&dev->dev, hp);
/* ... but we use OPAL event to kick the console */
if (!hvc_opal_event_registered) {
opal_notifier_register(&hvc_opal_console_nb);
hvc_opal_event_registered = true;
}
return 0;
}