[coreboot-gerrit] New patch to review for coreboot: mediatek/mt8173: add APLL clock setting
Patrick Georgi (pgeorgi@google.com)
gerrit at coreboot.org
Thu Jan 21 11:53:44 CET 2016
Patrick Georgi (pgeorgi at google.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/13090
-gerrit
commit 0f8907fde84c2be7f09ff7b7012d09dfca1c244c
Author: Koro Chen <koro.chen at mediatek.com>
Date: Tue Aug 4 16:16:46 2015 +0800
mediatek/mt8173: add APLL clock setting
Add a new function mt_pll_set_aud_div() to set APLL for audio I2S.
The function is called by mainboard's configure_audio().
BRANCH=chromeos-2015.07
BUG=chrome-os-partner:41507
TEST=build and verified pass on oak board
Change-Id: Ia3c2f250627028422a7427b93d78d49545eb7a75
Signed-off-by: Patrick Georgi <pgeorgi at chromium.org>
Original-Commit-Id: bb18943f5e74af7723bd4e01d4da96c0b153a0f6
Original-Change-Id: I7996a8048f2e54ab09093cca3c8bc7447b61170f
Original-Signed-off-by: Koro Chen <koro.chen at mediatek.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/297225
Original-Commit-Ready: Yidi Lin <yidi.lin at mediatek.com>
Original-Tested-by: Yidi Lin <yidi.lin at mediatek.com>
Original-Reviewed-by: Julius Werner <jwerner at chromium.org>
---
src/soc/mediatek/mt8173/include/soc/pll.h | 1 +
src/soc/mediatek/mt8173/pll.c | 34 +++++++++++++++++++++++++++++++
2 files changed, 35 insertions(+)
diff --git a/src/soc/mediatek/mt8173/include/soc/pll.h b/src/soc/mediatek/mt8173/include/soc/pll.h
index d41e2ae..aa9c8bb 100644
--- a/src/soc/mediatek/mt8173/include/soc/pll.h
+++ b/src/soc/mediatek/mt8173/include/soc/pll.h
@@ -283,5 +283,6 @@ enum {
void mt_pll_post_init(void);
void mt_pll_init(void);
+void mt_pll_set_aud_div(u32 rate);
#endif /* SOC_MEDIATEK_MT8173_PLL_H */
diff --git a/src/soc/mediatek/mt8173/pll.c b/src/soc/mediatek/mt8173/pll.c
index 3617ee9..4f386c0 100644
--- a/src/soc/mediatek/mt8173/pll.c
+++ b/src/soc/mediatek/mt8173/pll.c
@@ -454,3 +454,37 @@ void mt_pll_post_init(void)
/* NOTICE: raise Vproc voltage before raise ARMPLL frequency */
write32(&mt8173_infracfg->top_ckmuxsel, (1 << 2) | 1);
}
+
+void mt_pll_set_aud_div(u32 rate)
+{
+ u32 mclk_div;
+ u32 apll_clock = APLL2_CK_HZ;
+ int apll1 = 0;
+
+ if (rate % 11025 == 0) {
+ /* use APLL1 instead */
+ apll1 = 1;
+ apll_clock = APLL1_CK_HZ;
+ }
+ /* I2S1 clock */
+ mclk_div = (apll_clock / 256 / rate) - 1;
+ assert(apll_clock == rate * 256 * (mclk_div + 1));
+
+ if (apll1) {
+ /* mclk */
+ clrbits_le32(&mt8173_topckgen->clk_auddiv_0, 1 << 5);
+ clrsetbits_le32(&mt8173_topckgen->clk_auddiv_1, 0xff << 8,
+ mclk_div << 8);
+ /* bclk */
+ clrsetbits_le32(&mt8173_topckgen->clk_auddiv_0, 0xf << 24,
+ 7 << 24);
+ } else {
+ /* mclk */
+ setbits_le32(&mt8173_topckgen->clk_auddiv_0, 1 << 5);
+ clrsetbits_le32(&mt8173_topckgen->clk_auddiv_2, 0xff << 8,
+ mclk_div << 8);
+ /* bclk */
+ clrsetbits_le32(&mt8173_topckgen->clk_auddiv_0, 0xf << 28,
+ 7 << 28);
+ }
+}
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