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authorDavid Hendricks <dhendrix@chromium.org>2013-08-23 15:25:07 -0700
committerIsaac Christensen <isaac.christensen@se-eng.com>2014-08-12 22:18:53 +0200
commit72a42886505f54e81f437b618af1ab57e95c4b71 (patch)
treed2cc82ce1d6236860c3c31af9e5916cfeadf21ee /src/cpu/samsung
parentdd1aab95a6eb74eac7ea0463f7933d186dbd0efb (diff)
downloadcoreboot-72a42886505f54e81f437b618af1ab57e95c4b71.tar.xz
exynos5420: ddr3: Switch from 4G setup to 2G setup on exynos5420
This changes the number of chip selects that we configure from 2 to 1. On current setups with (x16 memory 4Gbit chips) that means that we're at 2GByte. Technically we should add a second setting in the ares_ddr3_timings and select between the two of the based on board strappings. That would make the CONFIG_RUN_TIME_BANK_NUMBER work properly. I've changed the ddr3_mem_ctrl_init() so it should handle that, but I'm not actually doing the board strapping read right now. This change means that accesses to 0xA0000000 - 0xFFFFFFFF on 2G systems will no longer put the system in a messed up state (leading to a hang). It also prevents some of the weird boot behavior that we've seen that comes and goes depending on U-Boot alignment. See <http://crosbug.com/p/20577>. This patch was ported from: https://gerrit.chromium.org/gerrit/66117 Signed-off-by: David Hendricks <dhendrix@chromium.org> Change-Id: Ib4cfe420aac30bd817438f06d01e8671afc4a27d Reviewed-on: https://chromium-review.googlesource.com/167210 Commit-Queue: David Hendricks <dhendrix@chromium.org> Tested-by: David Hendricks <dhendrix@chromium.org> Reviewed-by: ron minnich <rminnich@chromium.org> (cherry picked from commit 0ea574243058068702e3f6bc7355098745d16880) Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com> Reviewed-on: http://review.coreboot.org/6612 Tested-by: build bot (Jenkins)
Diffstat (limited to 'src/cpu/samsung')
-rw-r--r--src/cpu/samsung/exynos5420/dmc_init_ddr3.c36
1 files changed, 21 insertions, 15 deletions
diff --git a/src/cpu/samsung/exynos5420/dmc_init_ddr3.c b/src/cpu/samsung/exynos5420/dmc_init_ddr3.c
index a758433487..1126dca130 100644
--- a/src/cpu/samsung/exynos5420/dmc_init_ddr3.c
+++ b/src/cpu/samsung/exynos5420/dmc_init_ddr3.c
@@ -44,7 +44,7 @@ int ddr3_mem_ctrl_init(struct mem_timings *mem, int interleave_size, int reset)
struct exynos5_dmc *drex0, *drex1;
struct exynos5_tzasc *tzasc0, *tzasc1;
u32 val, nLockR, nLockW_phy0, nLockW_phy1;
- int i;
+ int i, chip;
phy0_ctrl = (struct exynos5_phy_control *)EXYNOS5_DMC_PHY0_BASE;
phy1_ctrl = (struct exynos5_phy_control *)EXYNOS5_DMC_PHY1_BASE;
@@ -218,12 +218,14 @@ int ddr3_mem_ctrl_init(struct mem_timings *mem, int interleave_size, int reset)
* Send auto refresh command for DRAM refresh.
*/
for (i = 0; i < 128; i++) {
- writel(DIRECT_CMD_REFA, &drex0->directcmd);
- writel(DIRECT_CMD_REFA | (0x1 << DIRECT_CMD_CHIP_SHIFT),
- &drex0->directcmd);
- writel(DIRECT_CMD_REFA, &drex1->directcmd);
- writel(DIRECT_CMD_REFA | (0x1 << DIRECT_CMD_CHIP_SHIFT),
- &drex1->directcmd);
+ for (chip = 0; chip < mem->chips_to_configure; chip++) {
+ writel(DIRECT_CMD_REFA |
+ (chip << DIRECT_CMD_CHIP_SHIFT),
+ &drex0->directcmd);
+ writel(DIRECT_CMD_REFA |
+ (chip << DIRECT_CMD_CHIP_SHIFT),
+ &drex1->directcmd);
+ }
}
}
@@ -263,10 +265,12 @@ int ddr3_mem_ctrl_init(struct mem_timings *mem, int interleave_size, int reset)
writel(nLockR, &phy1_ctrl->phy_con12);
val = (0x3 << DIRECT_CMD_BANK_SHIFT) | 0x4;
- writel(val, &drex0->directcmd);
- writel(val | (0x1 << DIRECT_CMD_CHIP_SHIFT), &drex0->directcmd);
- writel(val, &drex1->directcmd);
- writel(val | (0x1 << DIRECT_CMD_CHIP_SHIFT), &drex1->directcmd);
+ for (chip = 0; chip < mem->chips_to_configure; chip++) {
+ writel(val | (chip << DIRECT_CMD_CHIP_SHIFT),
+ &drex0->directcmd);
+ writel(val | (chip << DIRECT_CMD_CHIP_SHIFT),
+ &drex1->directcmd);
+ }
setbits_le32(&phy0_ctrl->phy_con2, RDLVL_GATE_EN);
setbits_le32(&phy1_ctrl->phy_con2, RDLVL_GATE_EN);
@@ -316,10 +320,12 @@ int ddr3_mem_ctrl_init(struct mem_timings *mem, int interleave_size, int reset)
writel(0, &phy1_ctrl->phy_con14);
val = (0x3 << DIRECT_CMD_BANK_SHIFT);
- writel(val, &drex0->directcmd);
- writel(val | (0x1 << DIRECT_CMD_CHIP_SHIFT), &drex0->directcmd);
- writel(val, &drex1->directcmd);
- writel(val | (0x1 << DIRECT_CMD_CHIP_SHIFT), &drex1->directcmd);
+ for (chip = 0; chip < mem->chips_to_configure; chip++) {
+ writel(val | (chip << DIRECT_CMD_CHIP_SHIFT),
+ &drex0->directcmd);
+ writel(val | (chip << DIRECT_CMD_CHIP_SHIFT),
+ &drex1->directcmd);
+ }
/* Common Settings for Leveling */
val = PHY_CON12_RESET_VAL;