From 5840626cec3db3262d506c0f90d062b8c602f3ea Mon Sep 17 00:00:00 2001 From: Yen Lin Date: Thu, 10 Jul 2014 11:46:10 -0700 Subject: T124: perform ram_repair when CPU rail is powered on in coldboot This patch is to perform software triggered RAM re-repair in the cold boot path. "RAM" actually refers to the CPU cache here (yeah, I know, but that's how the manuals call it). This is some magic hardware thing that must be done every time after applying power to the main CPU cores or their cache may have random failures in some very rare cases. BUG=chrome-os-partner:30430 BRANCH=nyan TEST=run cold reboot test on nyan. Original-Signed-off-by: Yen Lin Original-Change-Id: I87869431e80e7bc66948a7f67f35e5b907993765 Original-Reviewed-on: https://chromium-review.googlesource.com/207362 Original-Tested-by: Yen Lin Original-Reviewed-by: Tom Warren Original-Reviewed-by: Julius Werner Original-Commit-Queue: Yen Lin (cherry picked from commit d999f5ecc31d90c8dce1dd91533bc34ffd3c03f2) Signed-off-by: Marc Jones Change-Id: Iaee1d7f9fa8856f26d7ead70eaeeff9d80dbb181 Reviewed-on: http://review.coreboot.org/8415 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer --- src/soc/nvidia/tegra124/power.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'src/soc/nvidia/tegra124/power.c') diff --git a/src/soc/nvidia/tegra124/power.c b/src/soc/nvidia/tegra124/power.c index ec44a0fb02..75f04942b9 100644 --- a/src/soc/nvidia/tegra124/power.c +++ b/src/soc/nvidia/tegra124/power.c @@ -25,8 +25,10 @@ #include "pmc.h" #include "power.h" +#include "flow.h" static struct tegra_pmc_regs * const pmc = (void *)TEGRA_PMC_BASE; +static struct flow_ctlr * const flow = (void *)TEGRA_FLOW_BASE; static int partition_powered(int id) { @@ -92,3 +94,17 @@ int power_reset_status(void) { return read32(&pmc->rst_status) & 0x7; } + +void ram_repair(void) +{ + // Request RAM repair for cluster 0 + setbits_le32(&flow->ram_repair, RAM_REPAIR_REQ); + // Poll for completion + while (!(read32(&flow->ram_repair) & RAM_REPAIR_STS)) + ; + // Request RAM repair for cluster 1 + setbits_le32(&flow->ram_repair_cluster1, RAM_REPAIR_REQ); + // Poll for completion + while (!(read32(&flow->ram_repair_cluster1) & RAM_REPAIR_STS)) + ; +} -- cgit v1.2.3