[PATCHv2 2/5] mailbox/omap: add support for parsing dt devices
Suman Anna
s-anna at ti.com
Mon Jul 22 17:26:46 EDT 2013
Logic has been added to the OMAP2+ mailbox code to
parse the mailbox dt nodes and construct the different
mailboxes associated with the instance. The design is
based on gathering the same information that was being
passed previously through the platform data, except for
the interrupt type configuration information.
Signed-off-by: Suman Anna <s-anna at ti.com>
---
.../devicetree/bindings/mailbox/omap-mailbox.txt | 43 +++++++
drivers/mailbox/mailbox-omap2.c | 130 ++++++++++++++++++---
2 files changed, 158 insertions(+), 15 deletions(-)
create mode 100644 Documentation/devicetree/bindings/mailbox/omap-mailbox.txt
diff --git a/Documentation/devicetree/bindings/mailbox/omap-mailbox.txt b/Documentation/devicetree/bindings/mailbox/omap-mailbox.txt
new file mode 100644
index 0000000..8ffb08a
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/omap-mailbox.txt
@@ -0,0 +1,43 @@
+OMAP2+ Mailbox Driver
+
+Required properties:
+- compatible: Should be one of the following,
+ "ti,omap2-mailbox" for
+ OMAP2420, OMAP2430, OMAP3430, OMAP3630 SoCs
+ "ti,omap4-mailbox" for
+ OMAP44xx, OMAP54xx, AM33xx, AM43xx, DRA7xx SoCs
+- reg: Contains the mailbox register address range (base address
+ and length)
+- interrupts: Contains the interrupt information for the mailbox
+ device. The format is dependent on which interrupt
+ controller the OMAP device uses
+- ti,hwmods: Name of the hwmod associated with the mailbox
+- ti,mbox-num-users: Number of targets (processor devices) that the mailbox device
+ can interrupt
+- ti,mbox-num-fifos: Number of h/w fifos within the mailbox device
+- ti,mbox-names: Array of the names of the mailboxes
+- ti,mbox-data: Mailbox descriptor data private to each mailbox. The 4
+ cells represent the following data,
+ Cell #1 (tx_id) - mailbox fifo id used for
+ transmitting messages
+ Cell #2 (rx_id) - mailbox fifo id on which messages
+ are received
+ Cell #3 (irq_id) - irq identifier index number to use
+ from the interrupts data
+ Cell #4 (usr_id) - mailbox user id for identifying the
+ interrupt into the MPU interrupt
+ controller.
+
+Example:
+
+/* OMAP4 */
+mailbox: mailbox at 4a0f4000 {
+ compatible = "ti,omap4-mailbox";
+ reg = <0x4a0f4000 0x200>;
+ interrupts = <GIC_SPI 47 IRQ_TYPE_LEVEL_HIGH>;
+ ti,hwmods = "mailbox";
+ ti,mbox-num-users = <3>;
+ ti,mbox-num-fifos = <8>;
+ ti,mbox-names = "mbox-ipu", "mbox-dsp";
+ ti,mbox-data = <0 1 0 0>, <3 2 0 0>;
+};
diff --git a/drivers/mailbox/mailbox-omap2.c b/drivers/mailbox/mailbox-omap2.c
index 6c0687c..759f72c 100644
--- a/drivers/mailbox/mailbox-omap2.c
+++ b/drivers/mailbox/mailbox-omap2.c
@@ -14,6 +14,7 @@
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/err.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/pm_runtime.h>
@@ -222,6 +223,21 @@ static struct omap_mbox_ops omap2_mbox_ops = {
.restore_ctx = omap2_mbox_restore_ctx,
};
+static const struct of_device_id omap_mailbox_of_match[] = {
+ {
+ .compatible = "ti,omap2-mailbox",
+ .data = (void *) MBOX_INTR_CFG_TYPE1,
+ },
+ {
+ .compatible = "ti,omap4-mailbox",
+ .data = (void *) MBOX_INTR_CFG_TYPE2,
+ },
+ {
+ /* end */
+ },
+};
+MODULE_DEVICE_TABLE(of, omap_mailbox_of_match);
+
static int omap2_mbox_probe(struct platform_device *pdev)
{
struct resource *mem;
@@ -229,47 +245,127 @@ static int omap2_mbox_probe(struct platform_device *pdev)
struct omap_mbox **list, *mbox, *mboxblk;
struct omap_mbox2_priv *priv, *privblk;
struct omap_mbox_pdata *pdata = pdev->dev.platform_data;
- struct omap_mbox_dev_info *info;
struct omap_mbox_device *mdev;
- int i;
-
- if (!pdata || !pdata->info_cnt || !pdata->info) {
+ struct omap_mbox_dev_info *info, *of_info = NULL;
+ struct device_node *node = pdev->dev.of_node;
+ int i, j;
+ u32 info_count = 0, intr_type = 0;
+ u32 num_users = 0, num_fifos = 0;
+ u32 dlen, dsize = 4;
+ u32 *tmp;
+ const __be32 *mbox_data;
+
+ if (!node && (!pdata || !pdata->info_cnt || !pdata->info)) {
pr_err("%s: platform not supported\n", __func__);
return -ENODEV;
}
+ if (node) {
+ intr_type = (u32)of_match_device(omap_mailbox_of_match,
+ &pdev->dev)->data;
+ if (intr_type != 0 && intr_type != 1) {
+ dev_err(&pdev->dev, "invalid match data value\n");
+ return -EINVAL;
+ }
+
+ if (of_property_read_u32(node, "ti,mbox-num-users",
+ &num_users)) {
+ dev_err(&pdev->dev,
+ "no ti,mbox-num-users configuration found\n");
+ return -ENODEV;
+ }
+
+ if (of_property_read_u32(node, "ti,mbox-num-fifos",
+ &num_fifos)) {
+ dev_err(&pdev->dev,
+ "no ti,mbox-num-fifos configuration found\n");
+ return -ENODEV;
+ }
+
+ info_count = of_property_count_strings(node, "ti,mbox-names");
+ if (!info_count) {
+ dev_err(&pdev->dev, "no mbox devices found\n");
+ return -ENODEV;
+ }
+
+ mbox_data = of_get_property(node, "ti,mbox-data", &dlen);
+ if (!mbox_data) {
+ dev_err(&pdev->dev, "no mbox device data found\n");
+ return -ENODEV;
+ }
+ dlen /= sizeof(dsize);
+ if (dlen != dsize * info_count) {
+ dev_err(&pdev->dev, "mbox device data is truncated\n");
+ return -ENODEV;
+ }
+
+ of_info = kzalloc(info_count * sizeof(*of_info), GFP_KERNEL);
+ if (!of_info)
+ return -ENOMEM;
+
+ i = 0;
+ while (i < info_count) {
+ info = of_info + i;
+ if (of_property_read_string_index(node,
+ "ti,mbox-names", i, &info->name)) {
+ dev_err(&pdev->dev,
+ "mbox_name [%d] read failed\n", i);
+ ret = -ENODEV;
+ goto free_of;
+ }
+
+ tmp = &info->tx_id;
+ for (j = 0; j < dsize; j++) {
+ tmp[j] = of_read_number(
+ mbox_data + j + (i * dsize), 1);
+ }
+ i++;
+ }
+ }
+
+ if (!node) { /* non-DT device creation */
+ info_count = pdata->info_cnt;
+ info = pdata->info;
+ intr_type = pdata->intr_type;
+ num_users = pdata->num_users;
+ num_fifos = pdata->num_fifos;
+ } else {
+ info = of_info;
+ }
+
mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
- if (!mdev)
- return -ENOMEM;
+ if (!mdev) {
+ ret = -ENOMEM;
+ goto free_of;
+ }
/* allocate one extra for marking end of list */
- list = kzalloc((pdata->info_cnt + 1) * sizeof(*list), GFP_KERNEL);
+ list = kzalloc((info_count + 1) * sizeof(*list), GFP_KERNEL);
if (!list) {
ret = -ENOMEM;
goto free_mdev;
}
- mboxblk = mbox = kzalloc(pdata->info_cnt * sizeof(*mbox), GFP_KERNEL);
+ mboxblk = mbox = kzalloc(info_count * sizeof(*mbox), GFP_KERNEL);
if (!mboxblk) {
ret = -ENOMEM;
goto free_list;
}
- privblk = priv = kzalloc(pdata->info_cnt * sizeof(*priv), GFP_KERNEL);
+ privblk = priv = kzalloc(info_count * sizeof(*priv), GFP_KERNEL);
if (!privblk) {
ret = -ENOMEM;
goto free_mboxblk;
}
- info = pdata->info;
- for (i = 0; i < pdata->info_cnt; i++, info++, priv++) {
+ for (i = 0; i < info_count; i++, info++, priv++) {
priv->tx_fifo.msg = MAILBOX_MESSAGE(info->tx_id);
priv->tx_fifo.fifo_stat = MAILBOX_FIFOSTATUS(info->tx_id);
priv->rx_fifo.msg = MAILBOX_MESSAGE(info->rx_id);
priv->rx_fifo.msg_stat = MAILBOX_MSGSTATUS(info->rx_id);
priv->notfull_bit = MAILBOX_IRQ_NOTFULL(info->tx_id);
priv->newmsg_bit = MAILBOX_IRQ_NEWMSG(info->rx_id);
- if (pdata->intr_type) {
+ if (intr_type) {
priv->irqenable = OMAP4_MAILBOX_IRQENABLE(info->usr_id);
priv->irqstatus = OMAP4_MAILBOX_IRQSTATUS(info->usr_id);
priv->irqdisable =
@@ -279,7 +375,7 @@ static int omap2_mbox_probe(struct platform_device *pdev)
priv->irqstatus = MAILBOX_IRQSTATUS(info->usr_id);
priv->irqdisable = MAILBOX_IRQENABLE(info->usr_id);
}
- priv->intr_type = pdata->intr_type;
+ priv->intr_type = intr_type;
mbox->priv = priv;
mbox->parent = mdev;
@@ -307,8 +403,8 @@ static int omap2_mbox_probe(struct platform_device *pdev)
mutex_init(&mdev->cfg_lock);
mdev->dev = &pdev->dev;
- mdev->num_users = pdata->num_users;
- mdev->num_fifos = pdata->num_fifos;
+ mdev->num_users = num_users;
+ mdev->num_fifos = num_fifos;
mdev->mboxes = list;
ret = omap_mbox_register(&pdev->dev, list);
if (ret)
@@ -317,6 +413,7 @@ static int omap2_mbox_probe(struct platform_device *pdev)
pm_runtime_enable(mdev->dev);
+ kfree(of_info);
return 0;
unmap_mbox:
@@ -329,6 +426,8 @@ free_list:
kfree(list);
free_mdev:
kfree(mdev);
+free_of:
+ kfree(of_info);
return ret;
}
@@ -358,6 +457,7 @@ static struct platform_driver omap2_mbox_driver = {
.remove = omap2_mbox_remove,
.driver = {
.name = "omap-mailbox",
+ .of_match_table = omap_mailbox_of_match,
},
};
--
1.8.3.3
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