From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Boyd Subject: [PATCH v3 3/8] clk: qcom: Add support for regmap divider clocks Date: Mon, 19 Jan 2015 18:05:30 -0800 Message-ID: <1421719535-28398-4-git-send-email-sboyd@codeaurora.org> References: <1421719535-28398-1-git-send-email-sboyd@codeaurora.org> Return-path: In-Reply-To: <1421719535-28398-1-git-send-email-sboyd@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org To: Mike Turquette , Stephen Boyd Cc: Josh Cartwright , linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Rajendra Nayak List-Id: linux-arm-msm@vger.kernel.org From: Josh Cartwright Add support for dividers that use regmap instead of readl/writel. Signed-off-by: Josh Cartwright Signed-off-by: Rajendra Nayak [sboyd@codeaurora.org: Switch to using generic divider code, drop enable/disable, reword commit text] Signed-off-by: Stephen Boyd --- drivers/clk/qcom/Makefile | 1 + drivers/clk/qcom/clk-regmap-divider.c | 70 +++++++++++++++++++++++++++++++++++ drivers/clk/qcom/clk-regmap-divider.h | 29 +++++++++++++++ 3 files changed, 100 insertions(+) create mode 100644 drivers/clk/qcom/clk-regmap-divider.c create mode 100644 drivers/clk/qcom/clk-regmap-divider.h diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile index 783cfb24faa4..ed8976e87c0b 100644 --- a/drivers/clk/qcom/Makefile +++ b/drivers/clk/qcom/Makefile @@ -6,6 +6,7 @@ clk-qcom-y += clk-pll.o clk-qcom-y += clk-rcg.o clk-qcom-y += clk-rcg2.o clk-qcom-y += clk-branch.o +clk-qcom-y += clk-regmap-divider.o clk-qcom-y += reset.o obj-$(CONFIG_APQ_GCC_8084) += gcc-apq8084.o diff --git a/drivers/clk/qcom/clk-regmap-divider.c b/drivers/clk/qcom/clk-regmap-divider.c new file mode 100644 index 000000000000..53484912301e --- /dev/null +++ b/drivers/clk/qcom/clk-regmap-divider.c @@ -0,0 +1,70 @@ +/* + * Copyright (c) 2014, The Linux Foundation. All rights reserved. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include + +#include "clk-regmap-divider.h" + +static inline struct clk_regmap_div *to_clk_regmap_div(struct clk_hw *hw) +{ + return container_of(to_clk_regmap(hw), struct clk_regmap_div, clkr); +} + +static long div_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *prate) +{ + struct clk_regmap_div *divider = to_clk_regmap_div(hw); + + return divider_round_rate(hw, rate, prate, NULL, divider->width, + CLK_DIVIDER_ROUND_CLOSEST); +} + +static int div_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_regmap_div *divider = to_clk_regmap_div(hw); + struct clk_regmap *clkr = ÷r->clkr; + u32 div; + + div = divider_get_val(rate, parent_rate, NULL, divider->width, + CLK_DIVIDER_ROUND_CLOSEST); + + return regmap_update_bits(clkr->regmap, divider->reg, + (BIT(divider->width) - 1) << divider->shift, + div << divider->shift); +} + +static unsigned long div_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct clk_regmap_div *divider = to_clk_regmap_div(hw); + struct clk_regmap *clkr = ÷r->clkr; + u32 div; + + regmap_read(clkr->regmap, divider->reg, &div); + div >>= divider->shift; + div &= BIT(divider->width) - 1; + + return divider_recalc_rate(hw, parent_rate, div, NULL, + CLK_DIVIDER_ROUND_CLOSEST); +} + +const struct clk_ops clk_regmap_div_ops = { + .round_rate = div_round_rate, + .set_rate = div_set_rate, + .recalc_rate = div_recalc_rate, +}; +EXPORT_SYMBOL_GPL(clk_regmap_div_ops); diff --git a/drivers/clk/qcom/clk-regmap-divider.h b/drivers/clk/qcom/clk-regmap-divider.h new file mode 100644 index 000000000000..fc4492e3a827 --- /dev/null +++ b/drivers/clk/qcom/clk-regmap-divider.h @@ -0,0 +1,29 @@ +/* + * Copyright (c) 2014, The Linux Foundation. All rights reserved. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef __QCOM_CLK_REGMAP_DIVIDER_H__ +#define __QCOM_CLK_REGMAP_DIVIDER_H__ + +#include +#include "clk-regmap.h" + +struct clk_regmap_div { + u32 reg; + u32 shift; + u32 width; + struct clk_regmap clkr; +}; + +extern const struct clk_ops clk_regmap_div_ops; + +#endif -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project