[PATCH 1/1] RapidIO: Fix maintenance access to higher memory areas

[Thomas Moll]

Fix the maintenance access functions to farend RapidIO devices.
1. Fixed shift of the given offset, to open the maintenance window
2. Mask offset to limit access to the opened maintenance window
3. Added extended destid part to rowtear register, required for 16bit mode

This method is matching maintenance transactions generation described
by Freescale in the appnote AN2932. With this modification full access
to a 16MB maintenance window is possible, this patch is required for
IDT cps switches. For easier handling of the access routines, the
access was limited to aligned memory regions. This should be no problem
because all registers are 32bit wide.

The patch was generated against 2.6.34 kernel + patches from
Alexandre Bounine

Signed-off-by: Thomas Moll <thomas.moll at sysgo.com>
Tested-by: Alexandre Bounine <alexandre.bounine at idt.com>
---
 fsl_rio.c |   34 ++++++++++++++++++++++++++++------
 1 file changed, 28 insertions(+), 6 deletions(-)
diff -purN linux-base/arch/powerpc/sysdev/fsl_rio.c linux-new/arch/powerpc/sysdev/fsl_rio.c
--- linux-base/arch/powerpc/sysdev/fsl_rio.c	2010-05-17 08:56:43.000000000 +0200
+++ linux-new/arch/powerpc/sysdev/fsl_rio.c	2010-05-17 09:40:41.000000000 +0200
@@ -1,6 +1,10 @@
 /*
  * Freescale MPC85xx/MPC86xx RapidIO support
  *
+ * Copyright 2009 Sysgo AG
+ * Thomas Moll <thomas.moll at sysgo.com>
+ * - fixed maintenance access routines, check for aligned access
+ *
  * Copyright 2009 Integrated Device Technology, Inc.
  * Alex Bounine <alexandre.bounine at idt.com>
  * - Added Port-Write message handling
@@ -371,10 +375,17 @@ fsl_rio_config_read(struct rio_mport *mp
 	pr_debug
 	    ("fsl_rio_config_read: index %d destid %d hopcount %d offset %8.8x len %d\n",
 	     index, destid, hopcount, offset, len);
+
+	/* 16MB maintenance window possible */
+	/* allow only aligned access to maintenance registers */
+	if (offset > (0x1000000 - len) || !IS_ALIGNED(offset, len))
+		return -EINVAL;
+
 	out_be32(&priv->maint_atmu_regs->rowtar,
-		 (destid << 22) | (hopcount << 12) | ((offset & ~0x3) >> 9));
+		 (destid << 22) | (hopcount << 12) | (offset >> 12));
+	out_be32(&priv->maint_atmu_regs->rowtear,  (destid >> 10));
 
-	data = (u8 *) priv->maint_win + offset;
+	data = (u8 *) priv->maint_win + (offset & (RIO_MAINT_WIN_SIZE - 1));
 	switch (len) {
 	case 1:
 		__fsl_read_rio_config(rval, data, err, "lbz");
@@ -382,9 +393,11 @@ fsl_rio_config_read(struct rio_mport *mp
 	case 2:
 		__fsl_read_rio_config(rval, data, err, "lhz");
 		break;
-	default:
+	case 4:
 		__fsl_read_rio_config(rval, data, err, "lwz");
 		break;
+	default:
+		return -EINVAL;
 	}
 
 	if (err) {
@@ -419,10 +432,17 @@ fsl_rio_config_write(struct rio_mport *m
 	pr_debug
 	    ("fsl_rio_config_write: index %d destid %d hopcount %d offset %8.8x len %d val %8.8x\n",
 	     index, destid, hopcount, offset, len, val);
+
+	/* 16MB maintenance windows possible */
+	/* allow only aligned access to maintenance registers */
+	if (offset > (0x1000000 - len) || !IS_ALIGNED(offset, len))
+		return -EINVAL;
+
 	out_be32(&priv->maint_atmu_regs->rowtar,
-		 (destid << 22) | (hopcount << 12) | ((offset & ~0x3) >> 9));
+		 (destid << 22) | (hopcount << 12) | (offset >> 12));
+	out_be32(&priv->maint_atmu_regs->rowtear,  (destid >> 10));
 
-	data = (u8 *) priv->maint_win + offset;
+	data = (u8 *) priv->maint_win + (offset & (RIO_MAINT_WIN_SIZE - 1));
 	switch (len) {
 	case 1:
 		out_8((u8 *) data, val);
@@ -430,9 +450,11 @@ fsl_rio_config_write(struct rio_mport *m
 	case 2:
 		out_be16((u16 *) data, val);
 		break;
-	default:
+	case 4:
 		out_be32((u32 *) data, val);
 		break;
+	default:
+		return -EINVAL;
 	}
 
 	return 0;
@@ -1483,7 +1505,8 @@ int fsl_rio_setup(struct of_device *dev)
 
 	/* Configure maintenance transaction window */
 	out_be32(&priv->maint_atmu_regs->rowbar, law_start >> 12);
-	out_be32(&priv->maint_atmu_regs->rowar, 0x80077015);	/* 4M */
+	out_be32(&priv->maint_atmu_regs->rowar,
+		 0x80077000 | (ilog2(RIO_MAINT_WIN_SIZE) - 1));
 
 	priv->maint_win = ioremap(law_start, RIO_MAINT_WIN_SIZE);