[PATCH 06/13] rapidio/tsi721: add messaging mbox selector parameter

[Alexandre Bounine]

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.  

Signed-off-by: Alexandre Bounine <alexandre.bounine@xxxxxxx>
Tested-by: Barry Wood <barry.wood@xxxxxxx>
Cc: Matt Porter <mporter@xxxxxxxxxxxxxxxxxxx>
Cc: Andre van Herk <andre.van.herk@xxxxxxxxxxxxxxxxxxxxxxxxx>
Cc: Barry Wood <barry.wood@xxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 Documentation/rapidio/tsi721.txt |    5 +++++
 drivers/rapidio/devices/tsi721.c |   15 +++++++++++++++
 2 files changed, 20 insertions(+), 0 deletions(-)

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 @@ fully compatible with RIONET driver (Ethernet over RapidIO messaging services).
         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 @@ static int pcie_mrrs = -1;
 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 @@ static int tsi721_open_outb_mbox(struct rio_mport *mport, void *dev_id,
 		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 @@ static int tsi721_open_inb_mbox(struct rio_mport *mport, void *dev_id,
 		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;
-- 
1.7.8.4