// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright 2012 Freescale Semiconductor, Inc. * Copyright 2012 Linaro Ltd. */ #include <linux/bits.h> #include <linux/clk.h> #include <linux/clk-provider.h> #include <linux/io.h> #include <linux/slab.h> #include <linux/jiffies.h> #include <linux/err.h> #include "clk.h" static int clk_busy_wait(void __iomem *reg, u8 shift) { unsigned long timeout = jiffies + msecs_to_jiffies(10); while (readl_relaxed(reg) & (1 << shift)) if (time_after(jiffies, timeout)) return -ETIMEDOUT; return 0; } struct clk_busy_divider { struct clk_divider div; const struct clk_ops *div_ops; void __iomem *reg; u8 shift; }; static inline struct clk_busy_divider *to_clk_busy_divider(struct clk_hw *hw) { struct clk_divider *div = to_clk_divider(hw); return container_of(div, struct clk_busy_divider, div); } static unsigned long clk_busy_divider_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) { struct clk_busy_divider *busy = to_clk_busy_divider(hw); return busy->div_ops->recalc_rate(&busy->div.hw, parent_rate); } static long clk_busy_divider_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long *prate) { struct clk_busy_divider *busy = to_clk_busy_divider(hw); return busy->div_ops->round_rate(&busy->div.hw, rate, prate); } static int clk_busy_divider_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { struct clk_busy_divider *busy = to_clk_busy_divider(hw); int ret; ret = busy->div_ops->set_rate(&busy->div.hw, rate, parent_rate); if (!ret) ret = clk_busy_wait(busy->reg, busy->shift); return ret; } static const struct clk_ops clk_busy_divider_ops = { .recalc_rate = clk_busy_divider_recalc_rate, .round_rate = clk_busy_divider_round_rate, .set_rate = clk_busy_divider_set_rate, }; struct clk_hw *imx_clk_hw_busy_divider(const char *name, const char *parent_name, void __iomem *reg, u8 shift, u8 width, void __iomem *busy_reg, u8 busy_shift) { struct clk_busy_divider *busy; struct clk_hw *hw; struct clk_init_data init; int ret; busy = kzalloc(sizeof(*busy), GFP_KERNEL); if (!busy) return ERR_PTR(-ENOMEM); busy->reg = busy_reg; busy->shift = busy_shift; busy->div.reg = reg; busy->div.shift = shift; busy->div.width = width; busy->div.lock = &imx_ccm_lock; busy->div_ops = &clk_divider_ops; init.name = name; init.ops = &clk_busy_divider_ops; init.flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL; init.parent_names = &parent_name; init.num_parents = 1; busy->div.hw.init = &init; hw = &busy->div.hw; ret = clk_hw_register(NULL, hw); if (ret) { kfree(busy); return ERR_PTR(ret); } return hw; } struct clk_busy_mux { struct clk_mux mux; const struct clk_ops *mux_ops; void __iomem *reg; u8 shift; }; static inline struct clk_busy_mux *to_clk_busy_mux(struct clk_hw *hw) { struct clk_mux *mux = to_clk_mux(hw); return container_of(mux, struct clk_busy_mux, mux); } static u8 clk_busy_mux_get_parent(struct clk_hw *hw) { struct clk_busy_mux *busy = to_clk_busy_mux(hw); return busy->mux_ops->get_parent(&busy->mux.hw); } static int clk_busy_mux_set_parent(struct clk_hw *hw, u8 index) { struct clk_busy_mux *busy = to_clk_busy_mux(hw); int ret; ret = busy->mux_ops->set_parent(&busy->mux.hw, index); if (!ret) ret = clk_busy_wait(busy->reg, busy->shift); return ret; } static const struct clk_ops clk_busy_mux_ops = { .get_parent = clk_busy_mux_get_parent, .set_parent = clk_busy_mux_set_parent, }; struct clk_hw *imx_clk_hw_busy_mux(const char *name, void __iomem *reg, u8 shift, u8 width, void __iomem *busy_reg, u8 busy_shift, const char * const *parent_names, int num_parents) { struct clk_busy_mux *busy; struct clk_hw *hw; struct clk_init_data init; int ret; busy = kzalloc(sizeof(*busy), GFP_KERNEL); if (!busy) return ERR_PTR(-ENOMEM); busy->reg = busy_reg; busy->shift = busy_shift; busy->mux.reg = reg; busy->mux.shift = shift; busy->mux.mask = BIT(width) - 1; busy->mux.lock = &imx_ccm_lock; busy->mux_ops = &clk_mux_ops; init.name = name; init.ops = &clk_busy_mux_ops; init.flags = CLK_IS_CRITICAL; init.parent_names = parent_names; init.num_parents = num_parents; busy->mux.hw.init = &init; hw = &busy->mux.hw; ret = clk_hw_register(NULL, hw); if (ret) { kfree(busy); return ERR_PTR(ret); } return hw; }