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Message-Id: <1400113986-339-2-git-send-email-abrestic@chromium.org> Date: Wed, 14 May 2014 17:32:57 -0700 From: Andrew Bresticker <abrestic@...omium.org> To: linux-tegra@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org Cc: Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>, Mark Rutland <mark.rutland@....com>, Ian Campbell <ijc+devicetree@...lion.org.uk>, Kumar Gala <galak@...eaurora.org>, Stephen Warren <swarren@...dotorg.org>, Thierry Reding <thierry.reding@...il.com>, Russell King <linux@....linux.org.uk>, Peter De Schrijver <pdeschrijver@...dia.com>, Prashant Gaikwad <pgaikwad@...dia.com>, Mike Turquette <mturquette@...aro.org>, Kishon Vijay Abraham I <kishon@...com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Mathias Nyman <mathias.nyman@...el.com>, Grant Likely <grant.likely@...aro.org>, Randy Dunlap <rdunlap@...radead.org>, Jim Lin <jilin@...dia.com>, Andrew Bresticker <abrestic@...omium.org> Subject: [RFC PATCH 01/10] clk: tegra: Enable hardware control of PLLE From: Jim Lin <jilin@...dia.com> Enable hardware control of PLLE spread-spectrum, IDDQ, and enable controls when enabling PLLE. The hardware (e.g. XUSB) using PLLE will use these controls for power-saving optimizations. Signed-off-by: Jim Lin <jilin@...dia.com> Signed-off-by: Andrew Bresticker <abrestic@...omium.org> --- drivers/clk/tegra/clk-pll.c | 33 ++++++++++++++++++++++++++++++++- 1 file changed, 32 insertions(+), 1 deletion(-) diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c index 0d20241..84ca8b9 100644 --- a/drivers/clk/tegra/clk-pll.c +++ b/drivers/clk/tegra/clk-pll.c @@ -96,10 +96,20 @@ (PLLE_SS_MAX_VAL | PLLE_SS_INC_VAL | PLLE_SS_INCINTRV_VAL) #define PLLE_AUX_PLLP_SEL BIT(2) +#define PLLE_AUX_USE_LOCKDET BIT(3) #define PLLE_AUX_ENABLE_SWCTL BIT(4) +#define PLLE_AUX_SS_SWCTL BIT(6) #define PLLE_AUX_SEQ_ENABLE BIT(24) +#define PLLE_AUX_SEQ_START_STATE BIT(25) #define PLLE_AUX_PLLRE_SEL BIT(28) +#define XUSBIO_PLL_CFG0 0x51c +#define XUSBIO_PLL_CFG0_PADPLL_RESET_SWCTL BIT(0) +#define XUSBIO_PLL_CFG0_CLK_ENABLE_SWCTL BIT(2) +#define XUSBIO_PLL_CFG0_PADPLL_USE_LOCKDET BIT(6) +#define XUSBIO_PLL_CFG0_SEQ_ENABLE BIT(24) +#define XUSBIO_PLL_CFG0_SEQ_START_STATE BIT(25) + #define PLLE_MISC_PLLE_PTS BIT(8) #define PLLE_MISC_IDDQ_SW_VALUE BIT(13) #define PLLE_MISC_IDDQ_SW_CTRL BIT(14) @@ -1318,7 +1328,28 @@ static int clk_plle_tegra114_enable(struct clk_hw *hw) pll_writel(val, PLLE_SS_CTRL, pll); udelay(1); - /* TODO: enable hw control of xusb brick pll */ + /* Enable hw control of xusb brick pll */ + val = pll_readl_misc(pll); + val &= ~PLLE_MISC_IDDQ_SW_CTRL; + pll_writel_misc(val, pll); + + val = pll_readl(pll->params->aux_reg, pll); + val |= (PLLE_AUX_USE_LOCKDET | PLLE_AUX_SEQ_START_STATE); + val &= ~(PLLE_AUX_ENABLE_SWCTL | PLLE_AUX_SS_SWCTL); + pll_writel(val, pll->params->aux_reg, pll); + udelay(1); + val |= PLLE_AUX_SEQ_ENABLE; + pll_writel(val, pll->params->aux_reg, pll); + + val = pll_readl(XUSBIO_PLL_CFG0, pll); + val |= (XUSBIO_PLL_CFG0_PADPLL_USE_LOCKDET | + XUSBIO_PLL_CFG0_SEQ_START_STATE); + val &= ~(XUSBIO_PLL_CFG0_CLK_ENABLE_SWCTL | + XUSBIO_PLL_CFG0_PADPLL_RESET_SWCTL); + pll_writel(val, XUSBIO_PLL_CFG0, pll); + udelay(1); + val |= XUSBIO_PLL_CFG0_SEQ_ENABLE; + pll_writel(val, XUSBIO_PLL_CFG0, pll); out: if (pll->lock) -- 1.9.1.423.g4596e3a -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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