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Date: Tue, 31 Mar 2015 14:18:00 -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] 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 HID of the mbox it wishes to use.
Name (_DSD, Package () {
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package () {
Package (2) {"mboxes", "ACPIHID"},
}
})
Signed-off-by: Feng Kan <fkan@....com>
---
drivers/mailbox/mailbox.c | 121 +++++++++++++++++++++++++++++--------
include/linux/mailbox_controller.h | 2 +
2 files changed, 99 insertions(+), 24 deletions(-)
diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index 19b491d..9f2d0e3 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 +279,87 @@ int mbox_send_message(struct mbox_chan *chan, void *mssg)
}
EXPORT_SYMBOL_GPL(mbox_send_message);
+static acpi_status
+mbox_acpi_find(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+ struct acpi_device *acpi_dev;
+
+ if (acpi_bus_get_device(handle, &acpi_dev))
+ return AE_OK;
+
+ if (strcmp(acpi_device_hid(acpi_dev), (const char *)context) == 0)
+ *rv = acpi_dev;
+
+ return AE_OK;
+}
+
+static struct mbox_chan *mbox_acpi_parse_chan(struct device *dev, int index)
+{
+ const char *mbox_attr = "mboxes";
+ struct acpi_device *acpi_dev;
+ struct mbox_controller *mbox;
+ struct mbox_chan *chan;
+ int status;
+ char *hid_str;
+
+ status = device_property_read_string(dev, mbox_attr,
+ (const char **)&hid_str);
+ if (status)
+ return ERR_PTR(-ENODEV);
+
+ status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+ ACPI_UINT32_MAX, mbox_acpi_find, NULL,
+ (void *)hid_str, (void **)&acpi_dev);
+ if (ACPI_FAILURE(status) || !acpi_dev) {
+ dev_dbg(dev, "mbox: no matching mboxes %s found in ACPI table\n",
+ hid_str);
+ return ERR_PTR(-ENODEV);
+ }
+
+ chan = NULL;
+ list_for_each_entry(mbox, &mbox_cons, node)
+ if (ACPI_COMPANION(mbox->dev) == acpi_dev) {
+ chan = mbox->acpi_xlate(mbox, index);
+ break;
+ }
+
+ return chan;
+}
+
+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->of_xlate(mbox, &spec);
+ 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);
+ else
+ return mbox_acpi_parse_chan(dev, index);
+}
+
/**
* mbox_request_channel - Request a mailbox channel.
* @cl: Identity of the client requesting the channel.
@@ -298,36 +380,15 @@ 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);
@@ -384,6 +445,15 @@ void mbox_free_channel(struct mbox_chan *chan)
EXPORT_SYMBOL_GPL(mbox_free_channel);
static struct mbox_chan *
+acpi_mbox_index_xlate(struct mbox_controller *mbox, int chan)
+{
+ if (chan >= mbox->num_chans)
+ return NULL;
+
+ return &mbox->chans[chan];
+}
+
+static struct mbox_chan *
of_mbox_index_xlate(struct mbox_controller *mbox,
const struct of_phandle_args *sp)
{
@@ -434,6 +504,9 @@ int mbox_controller_register(struct mbox_controller *mbox)
if (!mbox->of_xlate)
mbox->of_xlate = of_mbox_index_xlate;
+ if (!mbox->acpi_xlate)
+ mbox->acpi_xlate = acpi_mbox_index_xlate;
+
mutex_lock(&con_mutex);
list_add_tail(&mbox->node, &mbox_cons);
mutex_unlock(&con_mutex);
diff --git a/include/linux/mailbox_controller.h b/include/linux/mailbox_controller.h
index d4cf96f..f61d9d4 100644
--- a/include/linux/mailbox_controller.h
+++ b/include/linux/mailbox_controller.h
@@ -80,6 +80,8 @@ struct mbox_controller {
unsigned txpoll_period;
struct mbox_chan *(*of_xlate)(struct mbox_controller *mbox,
const struct of_phandle_args *sp);
+ struct mbox_chan *(*acpi_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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