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194 lines
4.3 KiB
194 lines
4.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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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#include <linux/bits.h> |
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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 = to_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 const 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_hw *imx_clk_hw_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_hw *hw; |
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struct clk_init_data init; |
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int ret; |
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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 | CLK_IS_CRITICAL; |
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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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hw = &busy->div.hw; |
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ret = clk_hw_register(NULL, hw); |
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if (ret) { |
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kfree(busy); |
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return ERR_PTR(ret); |
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} |
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return hw; |
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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 = to_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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static const 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_hw *imx_clk_hw_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 * const *parent_names, int num_parents) |
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{ |
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struct clk_busy_mux *busy; |
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struct clk_hw *hw; |
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struct clk_init_data init; |
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int ret; |
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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.mask = BIT(width) - 1; |
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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 = CLK_IS_CRITICAL; |
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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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hw = &busy->mux.hw; |
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ret = clk_hw_register(NULL, hw); |
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if (ret) { |
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kfree(busy); |
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return ERR_PTR(ret); |
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} |
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return hw; |
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}
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