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Date: Tue, 7 Apr 2015 16:34:12 -0700
From: Feng Kan <fkan@....com>
To: patches@....com, jassisinghbrar@...il.com,
linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Cc: Feng Kan <fkan@....com>
Subject: [PATCH V2] mailbox: add ACPI support for mailbox framework
This will add support for ACPI parsing of the mboxes attribute
when booting with ACPI table. The client will have a attribute
mimic the dts call "mboxes". In the ACPI case, the client will
mark "mboxes" with the ACPI reference of the mbox it wishes to
use.
Name (_DSD, Package () {
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package () {
Package (2) {"mboxes", "^^MBOXREF"},
}
})
Signed-off-by: Feng Kan <fkan@....com>
---
V2 CHANGE:
- change to use ACPI reference rather than use ACPI HID directly.
- consolidate to use one single xlate function
drivers/mailbox/mailbox.c | 105 ++++++++++++++++++++++++++-----------
include/linux/mailbox_controller.h | 6 +--
2 files changed, 76 insertions(+), 35 deletions(-)
diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index 19b491d..8359f2e 100644
--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -9,6 +9,7 @@
* published by the Free Software Foundation.
*/
+#include <linux/acpi.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
@@ -278,6 +279,70 @@ int mbox_send_message(struct mbox_chan *chan, void *mssg)
}
EXPORT_SYMBOL_GPL(mbox_send_message);
+#ifdef CONFIG_ACPI
+static struct mbox_chan *mbox_acpi_parse_chan(struct device *dev, int index)
+{
+ struct acpi_device *acpi_dev;
+ struct mbox_controller *mbox;
+ struct mbox_chan *chan;
+ int status;
+ struct acpi_reference_args args;
+
+ status = acpi_dev_get_property_reference(ACPI_COMPANION(dev), "mboxes",
+ 0, &args);
+ if (ACPI_FAILURE(status)) {
+ dev_dbg(dev, "mbox: no matching mbox found in ACPI table\n");
+ return ERR_PTR(-ENODEV);
+ }
+ acpi_dev = args.adev;
+
+ chan = NULL;
+ list_for_each_entry(mbox, &mbox_cons, node)
+ if (ACPI_COMPANION(mbox->dev) == acpi_dev) {
+ chan = mbox->chan_xlate(mbox, index);
+ break;
+ }
+
+ return chan;
+}
+#endif
+
+static struct mbox_chan *mbox_of_parse_chan(struct device *dev, int index)
+{
+ struct of_phandle_args spec;
+ struct mbox_controller *mbox;
+ struct mbox_chan *chan;
+
+ if (of_parse_phandle_with_args(dev->of_node, "mboxes",
+ "#mbox-cells", index, &spec)) {
+ dev_dbg(dev, "%s: can't parse \"mboxes\" property\n", __func__);
+ return ERR_PTR(-ENODEV);
+ }
+
+ chan = NULL;
+ list_for_each_entry(mbox, &mbox_cons, node)
+ if (mbox->dev->of_node == spec.np) {
+ chan = mbox->chan_xlate(mbox, spec.args[0]);
+ break;
+ }
+
+ of_node_put(spec.np);
+ return chan;
+}
+
+static struct mbox_chan *mbox_parse_chan(struct device *dev, int index)
+{
+ if (!dev)
+ return ERR_PTR(-ENODEV);
+
+ if (dev->of_node)
+ return mbox_of_parse_chan(dev, index);
+#ifdef CONFIG_ACPI
+ else
+ return mbox_acpi_parse_chan(dev, index);
+#endif
+}
+
/**
* mbox_request_channel - Request a mailbox channel.
* @cl: Identity of the client requesting the channel.
@@ -298,36 +363,15 @@ EXPORT_SYMBOL_GPL(mbox_send_message);
struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index)
{
struct device *dev = cl->dev;
- struct mbox_controller *mbox;
- struct of_phandle_args spec;
struct mbox_chan *chan;
unsigned long flags;
int ret;
- if (!dev || !dev->of_node) {
- pr_debug("%s: No owner device node\n", __func__);
- return ERR_PTR(-ENODEV);
- }
-
mutex_lock(&con_mutex);
+ chan = mbox_parse_chan(dev, index);
- if (of_parse_phandle_with_args(dev->of_node, "mboxes",
- "#mbox-cells", index, &spec)) {
- dev_dbg(dev, "%s: can't parse \"mboxes\" property\n", __func__);
- mutex_unlock(&con_mutex);
- return ERR_PTR(-ENODEV);
- }
-
- chan = NULL;
- list_for_each_entry(mbox, &mbox_cons, node)
- if (mbox->dev->of_node == spec.np) {
- chan = mbox->of_xlate(mbox, &spec);
- break;
- }
-
- of_node_put(spec.np);
-
- if (!chan || chan->cl || !try_module_get(mbox->dev->driver->owner)) {
+ if (!chan || chan->cl ||
+ !try_module_get(chan->mbox->dev->driver->owner)) {
dev_dbg(dev, "%s: mailbox not free\n", __func__);
mutex_unlock(&con_mutex);
return ERR_PTR(-EBUSY);
@@ -384,15 +428,12 @@ void mbox_free_channel(struct mbox_chan *chan)
EXPORT_SYMBOL_GPL(mbox_free_channel);
static struct mbox_chan *
-of_mbox_index_xlate(struct mbox_controller *mbox,
- const struct of_phandle_args *sp)
+mbox_index_xlate(struct mbox_controller *mbox, int chan)
{
- int ind = sp->args[0];
-
- if (ind >= mbox->num_chans)
+ if (chan >= mbox->num_chans)
return NULL;
- return &mbox->chans[ind];
+ return &mbox->chans[chan];
}
/**
@@ -431,8 +472,8 @@ int mbox_controller_register(struct mbox_controller *mbox)
spin_lock_init(&chan->lock);
}
- if (!mbox->of_xlate)
- mbox->of_xlate = of_mbox_index_xlate;
+ if (!mbox->chan_xlate)
+ mbox->chan_xlate = mbox_index_xlate;
mutex_lock(&con_mutex);
list_add_tail(&mbox->node, &mbox_cons);
diff --git a/include/linux/mailbox_controller.h b/include/linux/mailbox_controller.h
index d4cf96f..920e545 100644
--- a/include/linux/mailbox_controller.h
+++ b/include/linux/mailbox_controller.h
@@ -66,7 +66,7 @@ struct mbox_chan_ops {
* no interrupt rises. Ignored if 'txdone_irq' is set.
* @txpoll_period: If 'txdone_poll' is in effect, the API polls for
* last TX's status after these many millisecs
- * @of_xlate: Controller driver specific mapping of channel via DT
+ * @chan_xlate: Controller driver specific mapping index to channel
* @poll: API private. Used to poll for TXDONE on all channels.
* @node: API private. To hook into list of controllers.
*/
@@ -78,8 +78,8 @@ struct mbox_controller {
bool txdone_irq;
bool txdone_poll;
unsigned txpoll_period;
- struct mbox_chan *(*of_xlate)(struct mbox_controller *mbox,
- const struct of_phandle_args *sp);
+ struct mbox_chan *(*chan_xlate)(struct mbox_controller *mbox,
+ int chan);
/* Internal to API */
struct timer_list poll;
struct list_head node;
--
1.9.1
--
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