diff options
| author | Koro Chen <koro.chen@mediatek.com> | 2015-08-04 16:16:46 +0800 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2016-01-22 19:37:15 +0100 |
| commit | 5d7c38ffa93b9713796bbccbf9c29cbacc1732d6 (patch) | |
| tree | d71ea820c1fecf392fd46c1deba16e7361fe583b /src | |
| parent | 0c22084ec0eb11cf6922f07ebfc6f434ab17892f (diff) | |
| download | coreboot-5d7c38ffa93b9713796bbccbf9c29cbacc1732d6.tar.xz | |
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@chromium.org>
Original-Commit-Id: bb18943f5e74af7723bd4e01d4da96c0b153a0f6
Original-Change-Id: I7996a8048f2e54ab09093cca3c8bc7447b61170f
Original-Signed-off-by: Koro Chen <koro.chen@mediatek.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/297225
Original-Commit-Ready: Yidi Lin <yidi.lin@mediatek.com>
Original-Tested-by: Yidi Lin <yidi.lin@mediatek.com>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/13090
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/soc/mediatek/mt8173/include/soc/pll.h | 1 | ||||
| -rw-r--r-- | src/soc/mediatek/mt8173/pll.c | 34 |
2 files changed, 35 insertions, 0 deletions
diff --git a/src/soc/mediatek/mt8173/include/soc/pll.h b/src/soc/mediatek/mt8173/include/soc/pll.h index d41e2ae518..aa9c8bbca9 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 3617ee9e71..4f386c0a32 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); + } +} |