rapidio/tsi721: add messaging mbox selector parameter
Add module parameter to allow load time configuration of available
RapidIO messaging mailboxes (MBOX1 - MBOX4).
Having a messaging MBOX selector mask allows to define which MBOXes are
controlled by the mport device driver and reserve some of them for
direct use by other drivers.
Link: http://lkml.kernel.org/r/1469125134-16523-7-git-send-email-alexandre.bounine@idt.com
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Tested-by: Barry Wood <barry.wood@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com>
Cc: Barry Wood <barry.wood@idt.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/Documentation/rapidio/tsi721.txt b/Documentation/rapidio/tsi721.txt
index 9c6ee38..cd2a293 100644
--- a/Documentation/rapidio/tsi721.txt
+++ b/Documentation/rapidio/tsi721.txt
@@ -46,6 +46,11 @@
0 = 128B, 1 = 256B, 2 = 512B, 3 = 1024B, 4 = 2048B and 5 = 4096B.
Default value is '-1' (= keep platform setting).
+- 'mbox_sel' - RIO messaging MBOX selection mask. This is a bitmask that defines
+ messaging MBOXes are managed by this device driver. Mask bits 0 - 3
+ correspond to MBOX0 - MBOX3. MBOX is under driver's control if the
+ corresponding bit is set to '1'. Default value is 0x0f (= all).
+
II. Known problems
None.
diff --git a/drivers/rapidio/devices/tsi721.c b/drivers/rapidio/devices/tsi721.c
index 85098f8..8e07cd5 100644
--- a/drivers/rapidio/devices/tsi721.c
+++ b/drivers/rapidio/devices/tsi721.c
@@ -46,6 +46,11 @@
module_param(pcie_mrrs, int, S_IRUGO);
MODULE_PARM_DESC(pcie_mrrs, "PCIe MRRS override value (0...5)");
+static u8 mbox_sel = 0x0f;
+module_param(mbox_sel, byte, S_IRUGO);
+MODULE_PARM_DESC(mbox_sel,
+ "RIO Messaging MBOX Selection Mask (default: 0x0f = all)");
+
static void tsi721_omsg_handler(struct tsi721_device *priv, int ch);
static void tsi721_imsg_handler(struct tsi721_device *priv, int ch);
@@ -1881,6 +1886,11 @@
goto out;
}
+ if ((mbox_sel & (1 << mbox)) == 0) {
+ rc = -ENODEV;
+ goto out;
+ }
+
priv->omsg_ring[mbox].dev_id = dev_id;
priv->omsg_ring[mbox].size = entries;
priv->omsg_ring[mbox].sts_rdptr = 0;
@@ -2165,6 +2175,11 @@
goto out;
}
+ if ((mbox_sel & (1 << mbox)) == 0) {
+ rc = -ENODEV;
+ goto out;
+ }
+
/* Initialize IB Messaging Ring */
priv->imsg_ring[mbox].dev_id = dev_id;
priv->imsg_ring[mbox].size = entries;
