clk: rockchip: add support for phase inverters (8a76f443) · Commits · e / devices / android_kernel_teracube_emerald

drivers/clk/rockchip/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -6,6 +6,7 @@ obj-y += clk-rockchip.o
		obj-y += clk.o
		obj-y += clk-pll.o
		obj-y += clk-cpu.o
		obj-y += clk-inverter.o
		obj-y += clk-mmc-phase.o
		obj-$(CONFIG_RESET_CONTROLLER) += softrst.o

drivers/clk/rockchip/clk-inverter.c

0 → 100644

+116 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright 2015 Heiko Stuebner <heiko@sntech.de>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*
		* 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 <linux/slab.h>
		#include <linux/clk-provider.h>
		#include <linux/io.h>
		#include <linux/spinlock.h>
		#include <linux/kernel.h>
		#include "clk.h"

		struct rockchip_inv_clock {
		struct clk_hw hw;
		void __iomem *reg;
		int shift;
		int flags;
		spinlock_t *lock;
		};

		#define to_inv_clock(_hw) container_of(_hw, struct rockchip_inv_clock, hw)

		#define INVERTER_MASK 0x1

		static int rockchip_inv_get_phase(struct clk_hw *hw)
		{
		struct rockchip_inv_clock *inv_clock = to_inv_clock(hw);
		u32 val;

		val = readl(inv_clock->reg) >> inv_clock->shift;
		val &= INVERTER_MASK;
		return val ? 180 : 0;
		}

		static int rockchip_inv_set_phase(struct clk_hw *hw, int degrees)
		{
		struct rockchip_inv_clock *inv_clock = to_inv_clock(hw);
		u32 val;

		if (degrees % 180 == 0) {
		val = !!degrees;
		} else {
		pr_err("%s: unsupported phase %d for %s\n",
		__func__, degrees, __clk_get_name(hw->clk));
		return -EINVAL;
		}

		if (inv_clock->flags & ROCKCHIP_INVERTER_HIWORD_MASK) {
		writel(HIWORD_UPDATE(val, INVERTER_MASK, inv_clock->shift),
		inv_clock->reg);
		} else {
		unsigned long flags;
		u32 reg;

		spin_lock_irqsave(inv_clock->lock, flags);

		reg = readl(inv_clock->reg);
		reg &= ~BIT(inv_clock->shift);
		reg \|= val;
		writel(reg, inv_clock->reg);

		spin_unlock_irqrestore(inv_clock->lock, flags);
		}

		return 0;
		}

		static const struct clk_ops rockchip_inv_clk_ops = {
		.get_phase = rockchip_inv_get_phase,
		.set_phase = rockchip_inv_set_phase,
		};

		struct clk rockchip_clk_register_inverter(const char name,
		const char const parent_names, u8 num_parents,
		void __iomem *reg, int shift, int flags,
		spinlock_t *lock)
		{
		struct clk_init_data init;
		struct rockchip_inv_clock *inv_clock;
		struct clk *clk;

		inv_clock = kmalloc(sizeof(*inv_clock), GFP_KERNEL);
		if (!inv_clock)
		return NULL;

		init.name = name;
		init.num_parents = num_parents;
		init.flags = CLK_SET_RATE_PARENT;
		init.parent_names = parent_names;
		init.ops = &rockchip_inv_clk_ops;

		inv_clock->hw.init = &init;
		inv_clock->reg = reg;
		inv_clock->shift = shift;
		inv_clock->flags = flags;
		inv_clock->lock = lock;

		clk = clk_register(NULL, &inv_clock->hw);
		if (IS_ERR(clk))
		goto err_free;

		return clk;

		err_free:
		kfree(inv_clock);
		return NULL;
		}

drivers/clk/rockchip/clk.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -277,6 +277,13 @@ void __init rockchip_clk_register_branches(
		list->div_shift
		);
		break;
		case branch_inverter:
		clk = rockchip_clk_register_inverter(
		list->name, list->parent_names,
		list->num_parents,
		reg_base + list->muxdiv_offset,
		list->div_shift, list->div_flags, &clk_lock);
		break;
		}

		/* none of the cases above matched */

drivers/clk/rockchip/clk.h

+20 −0

Original line number	Diff line number	Diff line
		@@ -182,6 +182,13 @@ struct clk rockchip_clk_register_mmc(const char name,
		const char const parent_names, u8 num_parents,
		void __iomem *reg, int shift);

		#define ROCKCHIP_INVERTER_HIWORD_MASK BIT(0)

		struct clk rockchip_clk_register_inverter(const char name,
		const char const parent_names, u8 num_parents,
		void __iomem *reg, int shift, int flags,
		spinlock_t *lock);

		#define PNAME(x) static const char *const x[] __initconst

		enum rockchip_clk_branch_type {
		@@ -191,6 +198,7 @@ enum rockchip_clk_branch_type {
		branch_fraction_divider,
		branch_gate,
		branch_mmc,
		branch_inverter,
		};

		struct rockchip_clk_branch {
		@@ -414,6 +422,18 @@ struct rockchip_clk_branch {
		.div_shift = shift, \
		}

		#define INVERTER(_id, cname, pname, io, is, if) \
		{ \
		.id = _id, \
		.branch_type = branch_inverter, \
		.name = cname, \
		.parent_names = (const char *[]){ pname }, \
		.num_parents = 1, \
		.muxdiv_offset = io, \
		.div_shift = is, \
		.div_flags = if, \
		}

		void rockchip_clk_init(struct device_node np, void __iomem base,
		unsigned long nr_clks);
		struct regmap *rockchip_clk_get_grf(void);