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[SCSI] bfa: Fix 1860 port initialize when ATC is enabled 

On Xen kernels, if ATC (address translation cache) is enabled, the
first PCIe DMA read from the adapter fails with an error. This is due to
a bug ASIC, which leads to a failure of 1860 ports to be initialised.

This patch includes the fix to disable Invalidated Tag Match Enable
capability by setting the bit 26 of CHIP_MISC_PRG to 0, by default it is
set to 1.

Signed-off-by: Anil Gurumurthy <agurumur@brocade.com>
Signed-off-by: Vijaya Mohan Guvva <vmohan@brocade.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Vijaya Mohan Guvva 2013-05-13 02:33:24 -07:00 committed by James Bottomley
parent d7cbc3044f
commit e1aaab89de
1 changed files with 10 additions and 0 deletions
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10
drivers/scsi/bfa/bfa_ioc_ct.c
View File

@ -918,6 +918,16 @@ bfa_ioc_ct2_pll_init(void __iomem *rb, enum bfi_asic_mode mode)
}
}
/*
* The very first PCIe DMA Read done by LPU fails with a fatal error,
* when Address Translation Cache (ATC) has been enabled by system BIOS.
*
* Workaround:
* Disable Invalidated Tag Match Enable capability by setting the bit 26
* of CHIP_MISC_PRG to 0, by default it is set to 1.
*/
r32 = readl(rb + CT2_CHIP_MISC_PRG);
writel((r32 & 0xfbffffff), (rb + CT2_CHIP_MISC_PRG));
/*
* Mask the interrupts and clear any