From 5d7c38ffa93b9713796bbccbf9c29cbacc1732d6 Mon Sep 17 00:00:00 2001 From: Koro Chen Date: Tue, 4 Aug 2015 16:16:46 +0800 Subject: 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 Original-Commit-Id: bb18943f5e74af7723bd4e01d4da96c0b153a0f6 Original-Change-Id: I7996a8048f2e54ab09093cca3c8bc7447b61170f Original-Signed-off-by: Koro Chen Original-Reviewed-on: https://chromium-review.googlesource.com/297225 Original-Commit-Ready: Yidi Lin Original-Tested-by: Yidi Lin Original-Reviewed-by: Julius Werner Reviewed-on: https://review.coreboot.org/13090 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth --- src/soc/mediatek/mt8173/include/soc/pll.h | 1 + src/soc/mediatek/mt8173/pll.c | 34 +++++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+) (limited to 'src/soc') 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); + } +} -- cgit v1.2.3