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authorAaron Durbin <adurbin@chromium.org>2015-08-13 09:05:22 -0500
committerAaron Durbin <adurbin@chromium.org>2015-08-19 14:04:08 +0000
commit416bf45480153e7a7d367d7b5da093786f4a433f (patch)
treef78c553224302e3be312afd85f5139296c419a6c /src
parenta537f9a2ecfd2753f06a5707af965658e21dd7e1 (diff)
downloadcoreboot-416bf45480153e7a7d367d7b5da093786f4a433f.tar.xz
skylake: correct IO-APIC redirection entry count
The skylake IO-APIC supports up to 120 redirection entries. In practice it seems FSP has already written to this write-once register. However, it doesn't hurt to actually be correct within the source. BUG=chrome-os-partner:43522 BRANCH=None TEST=Built and booted glados. Original-Change-Id: I666b1b6034f0d37a37ea918f802317f9d5f15718 Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/293251 Original-Reviewed-by: Robbie Zhang <robbie.zhang@intel.com> Original-Reviewed-by: Duncan Laurie <dlaurie@chromium.org> Change-Id: I6ddbc89c98c262e2dd0f9f0b76adb092d3043602 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/11235 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src')
-rw-r--r--src/soc/intel/skylake/lpc.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/soc/intel/skylake/lpc.c b/src/soc/intel/skylake/lpc.c
index 64dfa22a9c..861b5ba76b 100644
--- a/src/soc/intel/skylake/lpc.c
+++ b/src/soc/intel/skylake/lpc.c
@@ -54,15 +54,16 @@
static void pch_enable_ioapic(struct device *dev)
{
u32 reg32;
+ /* PCH-LP has 120 redirection entries */
+ const int redir_entries = 120;
set_ioapic_id((void *)IO_APIC_ADDR, 0x02);
/* affirm full set of redirection table entries ("write once") */
reg32 = io_apic_read((void *)IO_APIC_ADDR, 0x01);
- /* PCH-LP has 39 redirection entries */
reg32 &= ~0x00ff0000;
- reg32 |= 0x00270000;
+ reg32 |= (redir_entries - 1) << 16;
io_apic_write((void *)IO_APIC_ADDR, 0x01, reg32);