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rapidio: fix maintenance access to higher memory areas 

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.

Signed-off-by: Thomas Moll <thomas.moll@sysgo.com>
Tested-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Thomas Moll 2010-05-26 14:44:05 -07:00 committed by Linus Torvalds
parent 679395fdaa
commit bd4fb654e3
1 changed files with 32 additions and 9 deletions
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41
arch/powerpc/sysdev/fsl_rio.c
View File

@ -1,6 +1,10 @@
/*
* Freescale MPC85xx/MPC86xx RapidIO support
*
* Copyright 2009 Sysgo AG
* Thomas Moll <thomas.moll@sysgo.com>
* - fixed maintenance access routines, check for aligned access
*
* Copyright 2009 Integrated Device Technology, Inc.
* Alex Bounine <alexandre.bounine@idt.com>
* - Added Port-Write message handling
@ -371,10 +375,17 @@ fsl_rio_config_read(struct rio_mport *mport, int index, u16 destid,
pr_debug
("fsl_rio_config_read: index %d destid %d hopcount %d offset %8.8x len %d\n",
index, destid, hopcount, offset, len);
out_be32(&priv->maint_atmu_regs->rowtar,
(destid << 22) | (hopcount << 12) | ((offset & ~0x3) >> 9));
data = (u8 *) priv->maint_win + offset;
/* 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 >> 12));
out_be32(&priv->maint_atmu_regs->rowtear, (destid >> 10));
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 *mport, int index, u16 destid,
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 *mport, int index, u16 destid,
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);
out_be32(&priv->maint_atmu_regs->rowtar,
(destid << 22) | (hopcount << 12) | ((offset & ~0x3) >> 9));
data = (u8 *) priv->maint_win + offset;
/* 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 >> 12));
out_be32(&priv->maint_atmu_regs->rowtear, (destid >> 10));
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 *mport, int index, u16 destid,
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);