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e0654d0177
In case of error, the function clk_register() returns ERR_PTR() no NULL pointer. The NULL test in the return value check should be replaced with IS_ERR(). dpatch engine is used to auto generated this patch. (https://github.com/weiyj/dpatch) Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
190 lines
4.4 KiB
C
190 lines
4.4 KiB
C
/*
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* Copyright 2012 Freescale Semiconductor, Inc.
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* Copyright 2012 Linaro Ltd.
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*
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* The code contained herein is licensed under the GNU General Public
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* License. You may obtain a copy of the GNU General Public License
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* Version 2 or later at the following locations:
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*
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* http://www.opensource.org/licenses/gpl-license.html
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* http://www.gnu.org/copyleft/gpl.html
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*/
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/err.h>
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#include "clk.h"
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static int clk_busy_wait(void __iomem *reg, u8 shift)
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{
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unsigned long timeout = jiffies + msecs_to_jiffies(10);
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while (readl_relaxed(reg) & (1 << shift))
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if (time_after(jiffies, timeout))
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return -ETIMEDOUT;
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return 0;
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}
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struct clk_busy_divider {
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struct clk_divider div;
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const struct clk_ops *div_ops;
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void __iomem *reg;
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u8 shift;
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};
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static inline struct clk_busy_divider *to_clk_busy_divider(struct clk_hw *hw)
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{
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struct clk_divider *div = container_of(hw, struct clk_divider, hw);
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return container_of(div, struct clk_busy_divider, div);
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}
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static unsigned long clk_busy_divider_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct clk_busy_divider *busy = to_clk_busy_divider(hw);
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return busy->div_ops->recalc_rate(&busy->div.hw, parent_rate);
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}
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static long clk_busy_divider_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *prate)
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{
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struct clk_busy_divider *busy = to_clk_busy_divider(hw);
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return busy->div_ops->round_rate(&busy->div.hw, rate, prate);
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}
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static int clk_busy_divider_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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struct clk_busy_divider *busy = to_clk_busy_divider(hw);
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int ret;
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ret = busy->div_ops->set_rate(&busy->div.hw, rate, parent_rate);
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if (!ret)
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ret = clk_busy_wait(busy->reg, busy->shift);
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return ret;
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}
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static struct clk_ops clk_busy_divider_ops = {
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.recalc_rate = clk_busy_divider_recalc_rate,
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.round_rate = clk_busy_divider_round_rate,
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.set_rate = clk_busy_divider_set_rate,
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};
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struct clk *imx_clk_busy_divider(const char *name, const char *parent_name,
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void __iomem *reg, u8 shift, u8 width,
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void __iomem *busy_reg, u8 busy_shift)
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{
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struct clk_busy_divider *busy;
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struct clk *clk;
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struct clk_init_data init;
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busy = kzalloc(sizeof(*busy), GFP_KERNEL);
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if (!busy)
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return ERR_PTR(-ENOMEM);
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busy->reg = busy_reg;
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busy->shift = busy_shift;
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busy->div.reg = reg;
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busy->div.shift = shift;
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busy->div.width = width;
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busy->div.lock = &imx_ccm_lock;
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busy->div_ops = &clk_divider_ops;
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init.name = name;
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init.ops = &clk_busy_divider_ops;
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init.flags = CLK_SET_RATE_PARENT;
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init.parent_names = &parent_name;
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init.num_parents = 1;
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busy->div.hw.init = &init;
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clk = clk_register(NULL, &busy->div.hw);
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if (IS_ERR(clk))
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kfree(busy);
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return clk;
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}
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struct clk_busy_mux {
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struct clk_mux mux;
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const struct clk_ops *mux_ops;
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void __iomem *reg;
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u8 shift;
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};
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static inline struct clk_busy_mux *to_clk_busy_mux(struct clk_hw *hw)
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{
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struct clk_mux *mux = container_of(hw, struct clk_mux, hw);
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return container_of(mux, struct clk_busy_mux, mux);
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}
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static u8 clk_busy_mux_get_parent(struct clk_hw *hw)
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{
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struct clk_busy_mux *busy = to_clk_busy_mux(hw);
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return busy->mux_ops->get_parent(&busy->mux.hw);
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}
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static int clk_busy_mux_set_parent(struct clk_hw *hw, u8 index)
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{
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struct clk_busy_mux *busy = to_clk_busy_mux(hw);
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int ret;
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ret = busy->mux_ops->set_parent(&busy->mux.hw, index);
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if (!ret)
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ret = clk_busy_wait(busy->reg, busy->shift);
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return ret;
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}
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struct clk_ops clk_busy_mux_ops = {
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.get_parent = clk_busy_mux_get_parent,
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.set_parent = clk_busy_mux_set_parent,
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};
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struct clk *imx_clk_busy_mux(const char *name, void __iomem *reg, u8 shift,
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u8 width, void __iomem *busy_reg, u8 busy_shift,
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const char **parent_names, int num_parents)
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{
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struct clk_busy_mux *busy;
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struct clk *clk;
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struct clk_init_data init;
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busy = kzalloc(sizeof(*busy), GFP_KERNEL);
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if (!busy)
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return ERR_PTR(-ENOMEM);
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busy->reg = busy_reg;
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busy->shift = busy_shift;
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busy->mux.reg = reg;
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busy->mux.shift = shift;
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busy->mux.width = width;
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busy->mux.lock = &imx_ccm_lock;
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busy->mux_ops = &clk_mux_ops;
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init.name = name;
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init.ops = &clk_busy_mux_ops;
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init.flags = 0;
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init.parent_names = parent_names;
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init.num_parents = num_parents;
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busy->mux.hw.init = &init;
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clk = clk_register(NULL, &busy->mux.hw);
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if (IS_ERR(clk))
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kfree(busy);
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return clk;
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}
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