608 lines
13 KiB
C
608 lines
13 KiB
C
/*
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* drivers/clk/clk-axm5516.c
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*
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* Provides clock implementations for three different types of clock devices on
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* the Axxia device: PLL clock, a clock divider and a clock mux.
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*
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* Copyright (C) 2014 LSI Corporation
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/clk-provider.h>
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#include <linux/regmap.h>
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#include <dt-bindings/clock/lsi,axm5516-clks.h>
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/**
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* struct axxia_clk - Common struct to all Axxia clocks.
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* @hw: clk_hw for the common clk framework
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* @regmap: Regmap for the clock control registers
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*/
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struct axxia_clk {
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struct clk_hw hw;
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struct regmap *regmap;
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};
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#define to_axxia_clk(_hw) container_of(_hw, struct axxia_clk, hw)
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/**
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* struct axxia_pllclk - Axxia PLL generated clock.
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* @aclk: Common struct
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* @reg: Offset into regmap for PLL control register
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*/
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struct axxia_pllclk {
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struct axxia_clk aclk;
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u32 reg;
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};
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#define to_axxia_pllclk(_aclk) container_of(_aclk, struct axxia_pllclk, aclk)
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/**
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* axxia_pllclk_recalc - Calculate the PLL generated clock rate given the
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* parent clock rate.
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*/
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static unsigned long
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axxia_pllclk_recalc(struct clk_hw *hw, unsigned long parent_rate)
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{
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struct axxia_clk *aclk = to_axxia_clk(hw);
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struct axxia_pllclk *pll = to_axxia_pllclk(aclk);
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unsigned long rate, fbdiv, refdiv, postdiv;
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u32 control;
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regmap_read(aclk->regmap, pll->reg, &control);
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postdiv = ((control >> 0) & 0xf) + 1;
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fbdiv = ((control >> 4) & 0xfff) + 3;
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refdiv = ((control >> 16) & 0x1f) + 1;
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rate = (parent_rate / (refdiv * postdiv)) * fbdiv;
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return rate;
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}
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static const struct clk_ops axxia_pllclk_ops = {
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.recalc_rate = axxia_pllclk_recalc,
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};
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/**
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* struct axxia_divclk - Axxia clock divider
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* @aclk: Common struct
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* @reg: Offset into regmap for PLL control register
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* @shift: Bit position for divider value
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* @width: Number of bits in divider value
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*/
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struct axxia_divclk {
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struct axxia_clk aclk;
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u32 reg;
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u32 shift;
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u32 width;
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};
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#define to_axxia_divclk(_aclk) container_of(_aclk, struct axxia_divclk, aclk)
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/**
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* axxia_divclk_recalc_rate - Calculate clock divider output rage
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*/
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static unsigned long
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axxia_divclk_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
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{
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struct axxia_clk *aclk = to_axxia_clk(hw);
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struct axxia_divclk *divclk = to_axxia_divclk(aclk);
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u32 ctrl, div;
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regmap_read(aclk->regmap, divclk->reg, &ctrl);
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div = 1 + ((ctrl >> divclk->shift) & ((1 << divclk->width)-1));
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return parent_rate / div;
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}
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static const struct clk_ops axxia_divclk_ops = {
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.recalc_rate = axxia_divclk_recalc_rate,
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};
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/**
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* struct axxia_clkmux - Axxia clock mux
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* @aclk: Common struct
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* @reg: Offset into regmap for PLL control register
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* @shift: Bit position for selection value
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* @width: Number of bits in selection value
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*/
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struct axxia_clkmux {
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struct axxia_clk aclk;
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u32 reg;
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u32 shift;
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u32 width;
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};
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#define to_axxia_clkmux(_aclk) container_of(_aclk, struct axxia_clkmux, aclk)
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/**
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* axxia_clkmux_get_parent - Return the index of selected parent clock
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*/
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static u8 axxia_clkmux_get_parent(struct clk_hw *hw)
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{
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struct axxia_clk *aclk = to_axxia_clk(hw);
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struct axxia_clkmux *mux = to_axxia_clkmux(aclk);
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u32 ctrl, parent;
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regmap_read(aclk->regmap, mux->reg, &ctrl);
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parent = (ctrl >> mux->shift) & ((1 << mux->width) - 1);
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return (u8) parent;
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}
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static const struct clk_ops axxia_clkmux_ops = {
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.get_parent = axxia_clkmux_get_parent,
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};
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/*
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* PLLs
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*/
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static struct axxia_pllclk clk_fab_pll = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_fab_pll",
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.parent_names = (const char *[]){
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"clk_ref0"
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},
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.num_parents = 1,
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.ops = &axxia_pllclk_ops,
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},
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.reg = 0x01800,
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};
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static struct axxia_pllclk clk_cpu_pll = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_cpu_pll",
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.parent_names = (const char *[]){
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"clk_ref0"
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},
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.num_parents = 1,
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.ops = &axxia_pllclk_ops,
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},
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.reg = 0x02000,
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};
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static struct axxia_pllclk clk_sys_pll = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_sys_pll",
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.parent_names = (const char *[]){
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"clk_ref0"
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},
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.num_parents = 1,
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.ops = &axxia_pllclk_ops,
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},
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.reg = 0x02800,
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};
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static struct axxia_pllclk clk_sm0_pll = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_sm0_pll",
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.parent_names = (const char *[]){
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"clk_ref2"
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},
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.num_parents = 1,
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.ops = &axxia_pllclk_ops,
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},
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.reg = 0x03000,
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};
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static struct axxia_pllclk clk_sm1_pll = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_sm1_pll",
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.parent_names = (const char *[]){
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"clk_ref1"
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},
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.num_parents = 1,
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.ops = &axxia_pllclk_ops,
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},
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.reg = 0x03800,
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};
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/*
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* Clock dividers
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*/
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static struct axxia_divclk clk_cpu0_div = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_cpu0_div",
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.parent_names = (const char *[]){
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"clk_cpu_pll"
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},
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.num_parents = 1,
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.ops = &axxia_divclk_ops,
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},
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.reg = 0x10008,
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.shift = 0,
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.width = 4,
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};
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static struct axxia_divclk clk_cpu1_div = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_cpu1_div",
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.parent_names = (const char *[]){
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"clk_cpu_pll"
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},
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.num_parents = 1,
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.ops = &axxia_divclk_ops,
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},
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.reg = 0x10008,
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.shift = 4,
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.width = 4,
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};
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static struct axxia_divclk clk_cpu2_div = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_cpu2_div",
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.parent_names = (const char *[]){
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"clk_cpu_pll"
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},
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.num_parents = 1,
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.ops = &axxia_divclk_ops,
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},
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.reg = 0x10008,
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.shift = 8,
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.width = 4,
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};
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static struct axxia_divclk clk_cpu3_div = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_cpu3_div",
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.parent_names = (const char *[]){
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"clk_cpu_pll"
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},
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.num_parents = 1,
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.ops = &axxia_divclk_ops,
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},
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.reg = 0x10008,
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.shift = 12,
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.width = 4,
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};
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static struct axxia_divclk clk_nrcp_div = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_nrcp_div",
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.parent_names = (const char *[]){
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"clk_sys_pll"
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},
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.num_parents = 1,
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.ops = &axxia_divclk_ops,
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},
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.reg = 0x1000c,
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.shift = 0,
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.width = 4,
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};
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static struct axxia_divclk clk_sys_div = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_sys_div",
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.parent_names = (const char *[]){
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"clk_sys_pll"
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},
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.num_parents = 1,
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.ops = &axxia_divclk_ops,
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},
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.reg = 0x1000c,
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.shift = 4,
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.width = 4,
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};
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static struct axxia_divclk clk_fab_div = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_fab_div",
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.parent_names = (const char *[]){
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"clk_fab_pll"
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},
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.num_parents = 1,
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.ops = &axxia_divclk_ops,
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},
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.reg = 0x1000c,
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.shift = 8,
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.width = 4,
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};
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static struct axxia_divclk clk_per_div = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_per_div",
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.parent_names = (const char *[]){
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"clk_sm1_pll"
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},
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.num_parents = 1,
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.ops = &axxia_divclk_ops,
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},
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.reg = 0x1000c,
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.shift = 12,
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.width = 4,
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};
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static struct axxia_divclk clk_mmc_div = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_mmc_div",
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.parent_names = (const char *[]){
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"clk_sm1_pll"
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},
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.num_parents = 1,
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.ops = &axxia_divclk_ops,
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},
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.reg = 0x1000c,
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.shift = 16,
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.width = 4,
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};
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/*
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* Clock MUXes
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*/
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static struct axxia_clkmux clk_cpu0_mux = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_cpu0",
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.parent_names = (const char *[]){
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"clk_ref0",
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"clk_cpu_pll",
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"clk_cpu0_div",
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"clk_cpu0_div"
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},
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.num_parents = 4,
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.ops = &axxia_clkmux_ops,
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},
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.reg = 0x10000,
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.shift = 0,
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.width = 2,
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};
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static struct axxia_clkmux clk_cpu1_mux = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_cpu1",
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.parent_names = (const char *[]){
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"clk_ref0",
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"clk_cpu_pll",
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"clk_cpu1_div",
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"clk_cpu1_div"
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},
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.num_parents = 4,
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.ops = &axxia_clkmux_ops,
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},
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.reg = 0x10000,
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.shift = 2,
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.width = 2,
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};
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static struct axxia_clkmux clk_cpu2_mux = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_cpu2",
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.parent_names = (const char *[]){
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"clk_ref0",
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"clk_cpu_pll",
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"clk_cpu2_div",
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"clk_cpu2_div"
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},
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.num_parents = 4,
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.ops = &axxia_clkmux_ops,
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},
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.reg = 0x10000,
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.shift = 4,
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.width = 2,
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};
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static struct axxia_clkmux clk_cpu3_mux = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_cpu3",
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.parent_names = (const char *[]){
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"clk_ref0",
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"clk_cpu_pll",
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"clk_cpu3_div",
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"clk_cpu3_div"
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},
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.num_parents = 4,
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.ops = &axxia_clkmux_ops,
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},
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.reg = 0x10000,
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.shift = 6,
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.width = 2,
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};
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static struct axxia_clkmux clk_nrcp_mux = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_nrcp",
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.parent_names = (const char *[]){
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"clk_ref0",
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"clk_sys_pll",
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"clk_nrcp_div",
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"clk_nrcp_div"
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},
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.num_parents = 4,
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.ops = &axxia_clkmux_ops,
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},
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.reg = 0x10004,
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.shift = 0,
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.width = 2,
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};
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static struct axxia_clkmux clk_sys_mux = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_sys",
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.parent_names = (const char *[]){
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"clk_ref0",
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"clk_sys_pll",
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"clk_sys_div",
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"clk_sys_div"
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},
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.num_parents = 4,
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.ops = &axxia_clkmux_ops,
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},
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.reg = 0x10004,
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.shift = 2,
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.width = 2,
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};
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static struct axxia_clkmux clk_fab_mux = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_fab",
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.parent_names = (const char *[]){
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"clk_ref0",
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"clk_fab_pll",
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"clk_fab_div",
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"clk_fab_div"
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},
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.num_parents = 4,
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.ops = &axxia_clkmux_ops,
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},
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.reg = 0x10004,
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.shift = 4,
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.width = 2,
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};
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static struct axxia_clkmux clk_per_mux = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_per",
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.parent_names = (const char *[]){
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"clk_ref1",
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"clk_per_div"
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},
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.num_parents = 2,
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.ops = &axxia_clkmux_ops,
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},
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.reg = 0x10004,
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.shift = 6,
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.width = 1,
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};
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static struct axxia_clkmux clk_mmc_mux = {
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.aclk.hw.init = &(struct clk_init_data){
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.name = "clk_mmc",
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.parent_names = (const char *[]){
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"clk_ref1",
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"clk_mmc_div"
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},
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.num_parents = 2,
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.ops = &axxia_clkmux_ops,
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},
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.reg = 0x10004,
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.shift = 9,
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.width = 1,
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};
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/* Table of all supported clocks indexed by the clock identifiers from the
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* device tree binding
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*/
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static struct axxia_clk *axmclk_clocks[] = {
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[AXXIA_CLK_FAB_PLL] = &clk_fab_pll.aclk,
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[AXXIA_CLK_CPU_PLL] = &clk_cpu_pll.aclk,
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[AXXIA_CLK_SYS_PLL] = &clk_sys_pll.aclk,
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[AXXIA_CLK_SM0_PLL] = &clk_sm0_pll.aclk,
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[AXXIA_CLK_SM1_PLL] = &clk_sm1_pll.aclk,
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[AXXIA_CLK_FAB_DIV] = &clk_fab_div.aclk,
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[AXXIA_CLK_SYS_DIV] = &clk_sys_div.aclk,
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[AXXIA_CLK_NRCP_DIV] = &clk_nrcp_div.aclk,
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[AXXIA_CLK_CPU0_DIV] = &clk_cpu0_div.aclk,
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[AXXIA_CLK_CPU1_DIV] = &clk_cpu1_div.aclk,
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[AXXIA_CLK_CPU2_DIV] = &clk_cpu2_div.aclk,
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[AXXIA_CLK_CPU3_DIV] = &clk_cpu3_div.aclk,
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[AXXIA_CLK_PER_DIV] = &clk_per_div.aclk,
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[AXXIA_CLK_MMC_DIV] = &clk_mmc_div.aclk,
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[AXXIA_CLK_FAB] = &clk_fab_mux.aclk,
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[AXXIA_CLK_SYS] = &clk_sys_mux.aclk,
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[AXXIA_CLK_NRCP] = &clk_nrcp_mux.aclk,
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[AXXIA_CLK_CPU0] = &clk_cpu0_mux.aclk,
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[AXXIA_CLK_CPU1] = &clk_cpu1_mux.aclk,
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[AXXIA_CLK_CPU2] = &clk_cpu2_mux.aclk,
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[AXXIA_CLK_CPU3] = &clk_cpu3_mux.aclk,
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[AXXIA_CLK_PER] = &clk_per_mux.aclk,
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[AXXIA_CLK_MMC] = &clk_mmc_mux.aclk,
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};
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|
static struct clk_hw *
|
|
of_clk_axmclk_get(struct of_phandle_args *clkspec, void *unused)
|
|
{
|
|
unsigned int idx = clkspec->args[0];
|
|
|
|
if (idx >= ARRAY_SIZE(axmclk_clocks)) {
|
|
pr_err("%s: invalid index %u\n", __func__, idx);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
return &axmclk_clocks[idx]->hw;
|
|
}
|
|
|
|
static const struct regmap_config axmclk_regmap_config = {
|
|
.reg_bits = 32,
|
|
.reg_stride = 4,
|
|
.val_bits = 32,
|
|
.max_register = 0x1fffc,
|
|
.fast_io = true,
|
|
};
|
|
|
|
static const struct of_device_id axmclk_match_table[] = {
|
|
{ .compatible = "lsi,axm5516-clks" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, axmclk_match_table);
|
|
|
|
static int axmclk_probe(struct platform_device *pdev)
|
|
{
|
|
void __iomem *base;
|
|
struct resource *res;
|
|
int i, ret;
|
|
struct device *dev = &pdev->dev;
|
|
struct regmap *regmap;
|
|
size_t num_clks;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
base = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(base))
|
|
return PTR_ERR(base);
|
|
|
|
regmap = devm_regmap_init_mmio(dev, base, &axmclk_regmap_config);
|
|
if (IS_ERR(regmap))
|
|
return PTR_ERR(regmap);
|
|
|
|
num_clks = ARRAY_SIZE(axmclk_clocks);
|
|
pr_info("axmclk: supporting %zu clocks\n", num_clks);
|
|
|
|
/* Update each entry with the allocated regmap and register the clock
|
|
* with the common clock framework
|
|
*/
|
|
for (i = 0; i < num_clks; i++) {
|
|
axmclk_clocks[i]->regmap = regmap;
|
|
ret = devm_clk_hw_register(dev, &axmclk_clocks[i]->hw);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return of_clk_add_hw_provider(dev->of_node, of_clk_axmclk_get, NULL);
|
|
}
|
|
|
|
static int axmclk_remove(struct platform_device *pdev)
|
|
{
|
|
of_clk_del_provider(pdev->dev.of_node);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver axmclk_driver = {
|
|
.probe = axmclk_probe,
|
|
.remove = axmclk_remove,
|
|
.driver = {
|
|
.name = "clk-axm5516",
|
|
.of_match_table = axmclk_match_table,
|
|
},
|
|
};
|
|
|
|
static int __init axmclk_init(void)
|
|
{
|
|
return platform_driver_register(&axmclk_driver);
|
|
}
|
|
core_initcall(axmclk_init);
|
|
|
|
static void __exit axmclk_exit(void)
|
|
{
|
|
platform_driver_unregister(&axmclk_driver);
|
|
}
|
|
module_exit(axmclk_exit);
|
|
|
|
MODULE_DESCRIPTION("AXM5516 clock driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:clk-axm5516");
|