ARM: imx: add common clock support for pfd (a10bd67f) · Commits · e / devices / android_kernel_xiaomi_markw

arch/arm/mach-imx/Makefile

+2 −1

Original line number	Diff line number	Diff line
		@@ -11,7 +11,8 @@ obj-$(CONFIG_SOC_IMX35) += mm-imx3.o cpu-imx35.o clock-imx35.o ehci-imx35.o pm-i

		obj-$(CONFIG_SOC_IMX5) += cpu-imx5.o mm-imx5.o clock-mx51-mx53.o ehci-imx5.o pm-imx5.o cpu_op-mx51.o

		obj-$(CONFIG_COMMON_CLK) += clk-pllv1.o clk-pllv2.o clk-pllv3.o clk-gate2.o
		obj-$(CONFIG_COMMON_CLK) += clk-pllv1.o clk-pllv2.o clk-pllv3.o clk-gate2.o \
		clk-pfd.o

		# Support for CMOS sensor interface
		obj-$(CONFIG_MX1_VIDEO) += mx1-camera-fiq.o mx1-camera-fiq-ksym.o

arch/arm/mach-imx/clk-pfd.c

0 → 100644

+147 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright 2012 Freescale Semiconductor, Inc.
		* Copyright 2012 Linaro Ltd.
		*
		* The code contained herein is licensed under the GNU General Public
		* License. You may obtain a copy of the GNU General Public License
		* Version 2 or later at the following locations:
		*
		* http://www.opensource.org/licenses/gpl-license.html
		* http://www.gnu.org/copyleft/gpl.html
		*/

		#include <linux/clk.h>
		#include <linux/clk-provider.h>
		#include <linux/io.h>
		#include <linux/slab.h>
		#include <linux/err.h>
		#include "clk.h"

		/**
		* struct clk_pfd - IMX PFD clock
		* @clk_hw: clock source
		* @reg: PFD register address
		* @idx: the index of PFD encoded in the register
		*
		* PFD clock found on i.MX6 series. Each register for PFD has 4 clk_pfd
		* data encoded, and member idx is used to specify the one. And each
		* register has SET, CLR and TOG registers at offset 0x4 0x8 and 0xc.
		*/
		struct clk_pfd {
		struct clk_hw hw;
		void __iomem *reg;
		u8 idx;
		};

		#define to_clk_pfd(_hw) container_of(_hw, struct clk_pfd, hw)

		#define SET 0x4
		#define CLR 0x8
		#define OTG 0xc

		static int clk_pfd_enable(struct clk_hw *hw)
		{
		struct clk_pfd *pfd = to_clk_pfd(hw);

		writel_relaxed(1 << ((pfd->idx + 1) * 8 - 1), pfd->reg + CLR);

		return 0;
		}

		static void clk_pfd_disable(struct clk_hw *hw)
		{
		struct clk_pfd *pfd = to_clk_pfd(hw);

		writel_relaxed(1 << ((pfd->idx + 1) * 8 - 1), pfd->reg + SET);
		}

		static unsigned long clk_pfd_recalc_rate(struct clk_hw *hw,
		unsigned long parent_rate)
		{
		struct clk_pfd *pfd = to_clk_pfd(hw);
		u64 tmp = parent_rate;
		u8 frac = (readl_relaxed(pfd->reg) >> (pfd->idx * 8)) & 0x3f;

		tmp *= 18;
		do_div(tmp, frac);

		return tmp;
		}

		static long clk_pfd_round_rate(struct clk_hw *hw, unsigned long rate,
		unsigned long *prate)
		{
		u64 tmp = *prate;
		u8 frac;

		tmp = tmp * 18 + rate / 2;
		do_div(tmp, rate);
		frac = tmp;
		if (frac < 12)
		frac = 12;
		else if (frac > 35)
		frac = 35;
		tmp = *prate;
		tmp *= 18;
		do_div(tmp, frac);

		return tmp;
		}

		static int clk_pfd_set_rate(struct clk_hw *hw, unsigned long rate,
		unsigned long parent_rate)
		{
		struct clk_pfd *pfd = to_clk_pfd(hw);
		u64 tmp = parent_rate;
		u8 frac;

		tmp = tmp * 18 + rate / 2;
		do_div(tmp, rate);
		frac = tmp;
		if (frac < 12)
		frac = 12;
		else if (frac > 35)
		frac = 35;

		writel_relaxed(0x3f << (pfd->idx * 8), pfd->reg + CLR);
		writel_relaxed(frac << (pfd->idx * 8), pfd->reg + SET);

		return 0;
		}

		static const struct clk_ops clk_pfd_ops = {
		.enable = clk_pfd_enable,
		.disable = clk_pfd_disable,
		.recalc_rate = clk_pfd_recalc_rate,
		.round_rate = clk_pfd_round_rate,
		.set_rate = clk_pfd_set_rate,
		};

		struct clk imx_clk_pfd(const char name, const char *parent_name,
		void __iomem *reg, u8 idx)
		{
		struct clk_pfd *pfd;
		struct clk *clk;
		struct clk_init_data init;

		pfd = kzalloc(sizeof(*pfd), GFP_KERNEL);
		if (!pfd)
		return ERR_PTR(-ENOMEM);

		pfd->reg = reg;
		pfd->idx = idx;

		init.name = name;
		init.ops = &clk_pfd_ops;
		init.flags = 0;
		init.parent_names = &parent_name;
		init.num_parents = 1;

		pfd->hw.init = &init;

		clk = clk_register(NULL, &pfd->hw);
		if (IS_ERR(clk))
		kfree(pfd);

		return clk;
		}

arch/arm/mach-imx/clk.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -36,6 +36,9 @@ static inline struct clk imx_clk_gate2(const char name, const char *parent,
		shift, 0, &imx_ccm_lock);
		}

		struct clk imx_clk_pfd(const char name, const char *parent_name,
		void __iomem *reg, u8 idx);

		static inline struct clk imx_clk_fixed(const char name, int rate)
		{
		return clk_register_fixed_rate(NULL, name, NULL, CLK_IS_ROOT, rate);