310 lines
6.8 KiB
C
310 lines
6.8 KiB
C
/*
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* Copyright 2014 Linaro Ltd.
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* Copyright (C) 2014 ZTE Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/clk-provider.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/iopoll.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <asm/div64.h>
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#include "clk.h"
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#define to_clk_zx_pll(_hw) container_of(_hw, struct clk_zx_pll, hw)
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#define to_clk_zx_audio(_hw) container_of(_hw, struct clk_zx_audio, hw)
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#define CFG0_CFG1_OFFSET 4
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#define LOCK_FLAG BIT(30)
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#define POWER_DOWN BIT(31)
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static int rate_to_idx(struct clk_zx_pll *zx_pll, unsigned long rate)
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{
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const struct zx_pll_config *config = zx_pll->lookup_table;
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int i;
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for (i = 0; i < zx_pll->count; i++) {
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if (config[i].rate > rate)
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return i > 0 ? i - 1 : 0;
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if (config[i].rate == rate)
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return i;
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}
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return i - 1;
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}
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static int hw_to_idx(struct clk_zx_pll *zx_pll)
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{
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const struct zx_pll_config *config = zx_pll->lookup_table;
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u32 hw_cfg0, hw_cfg1;
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int i;
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hw_cfg0 = readl_relaxed(zx_pll->reg_base);
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hw_cfg1 = readl_relaxed(zx_pll->reg_base + CFG0_CFG1_OFFSET);
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/* For matching the value in lookup table */
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hw_cfg0 &= ~LOCK_FLAG;
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hw_cfg0 |= POWER_DOWN;
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for (i = 0; i < zx_pll->count; i++) {
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if (hw_cfg0 == config[i].cfg0 && hw_cfg1 == config[i].cfg1)
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return i;
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}
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return -EINVAL;
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}
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static unsigned long zx_pll_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct clk_zx_pll *zx_pll = to_clk_zx_pll(hw);
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int idx;
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idx = hw_to_idx(zx_pll);
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if (unlikely(idx == -EINVAL))
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return 0;
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return zx_pll->lookup_table[idx].rate;
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}
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static long zx_pll_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_zx_pll *zx_pll = to_clk_zx_pll(hw);
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int idx;
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idx = rate_to_idx(zx_pll, rate);
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return zx_pll->lookup_table[idx].rate;
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}
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static int zx_pll_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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/* Assume current cpu is not running on current PLL */
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struct clk_zx_pll *zx_pll = to_clk_zx_pll(hw);
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const struct zx_pll_config *config;
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int idx;
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idx = rate_to_idx(zx_pll, rate);
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config = &zx_pll->lookup_table[idx];
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writel_relaxed(config->cfg0, zx_pll->reg_base);
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writel_relaxed(config->cfg1, zx_pll->reg_base + CFG0_CFG1_OFFSET);
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return 0;
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}
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static int zx_pll_enable(struct clk_hw *hw)
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{
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struct clk_zx_pll *zx_pll = to_clk_zx_pll(hw);
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u32 reg;
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reg = readl_relaxed(zx_pll->reg_base);
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writel_relaxed(reg & ~POWER_DOWN, zx_pll->reg_base);
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return readl_relaxed_poll_timeout(zx_pll->reg_base, reg,
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reg & LOCK_FLAG, 0, 100);
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}
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static void zx_pll_disable(struct clk_hw *hw)
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{
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struct clk_zx_pll *zx_pll = to_clk_zx_pll(hw);
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u32 reg;
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reg = readl_relaxed(zx_pll->reg_base);
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writel_relaxed(reg | POWER_DOWN, zx_pll->reg_base);
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}
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static int zx_pll_is_enabled(struct clk_hw *hw)
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{
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struct clk_zx_pll *zx_pll = to_clk_zx_pll(hw);
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u32 reg;
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reg = readl_relaxed(zx_pll->reg_base);
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return !(reg & POWER_DOWN);
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}
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static const struct clk_ops zx_pll_ops = {
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.recalc_rate = zx_pll_recalc_rate,
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.round_rate = zx_pll_round_rate,
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.set_rate = zx_pll_set_rate,
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.enable = zx_pll_enable,
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.disable = zx_pll_disable,
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.is_enabled = zx_pll_is_enabled,
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};
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struct clk *clk_register_zx_pll(const char *name, const char *parent_name,
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unsigned long flags, void __iomem *reg_base,
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const struct zx_pll_config *lookup_table,
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int count, spinlock_t *lock)
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{
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struct clk_zx_pll *zx_pll;
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struct clk *clk;
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struct clk_init_data init;
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zx_pll = kzalloc(sizeof(*zx_pll), GFP_KERNEL);
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if (!zx_pll)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.ops = &zx_pll_ops;
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init.flags = flags;
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init.parent_names = parent_name ? &parent_name : NULL;
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init.num_parents = parent_name ? 1 : 0;
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zx_pll->reg_base = reg_base;
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zx_pll->lookup_table = lookup_table;
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zx_pll->count = count;
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zx_pll->lock = lock;
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zx_pll->hw.init = &init;
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clk = clk_register(NULL, &zx_pll->hw);
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if (IS_ERR(clk))
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kfree(zx_pll);
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return clk;
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}
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#define BPAR 1000000
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static u32 calc_reg(u32 parent_rate, u32 rate)
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{
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u32 sel, integ, fra_div, tmp;
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u64 tmp64 = (u64)parent_rate * BPAR;
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do_div(tmp64, rate);
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integ = (u32)tmp64 / BPAR;
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integ = integ >> 1;
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tmp = (u32)tmp64 % BPAR;
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sel = tmp / BPAR;
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tmp = tmp % BPAR;
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fra_div = tmp * 0xff / BPAR;
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tmp = (sel << 24) | (integ << 16) | (0xff << 8) | fra_div;
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/* Set I2S integer divider as 1. This bit is reserved for SPDIF
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* and do no harm.
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*/
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tmp |= BIT(28);
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return tmp;
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}
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static u32 calc_rate(u32 reg, u32 parent_rate)
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{
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u32 sel, integ, fra_div, tmp;
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u64 tmp64 = (u64)parent_rate * BPAR;
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tmp = reg;
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sel = (tmp >> 24) & BIT(0);
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integ = (tmp >> 16) & 0xff;
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fra_div = tmp & 0xff;
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tmp = fra_div * BPAR;
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tmp = tmp / 0xff;
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tmp += sel * BPAR;
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tmp += 2 * integ * BPAR;
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do_div(tmp64, tmp);
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return (u32)tmp64;
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}
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static unsigned long zx_audio_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct clk_zx_audio *zx_audio = to_clk_zx_audio(hw);
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u32 reg;
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reg = readl_relaxed(zx_audio->reg_base);
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return calc_rate(reg, parent_rate);
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}
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static long zx_audio_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *prate)
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{
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u32 reg;
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if (rate * 2 > *prate)
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return -EINVAL;
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reg = calc_reg(*prate, rate);
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return calc_rate(reg, *prate);
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}
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static int zx_audio_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_zx_audio *zx_audio = to_clk_zx_audio(hw);
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u32 reg;
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reg = calc_reg(parent_rate, rate);
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writel_relaxed(reg, zx_audio->reg_base);
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return 0;
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}
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#define ZX_AUDIO_EN BIT(25)
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static int zx_audio_enable(struct clk_hw *hw)
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{
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struct clk_zx_audio *zx_audio = to_clk_zx_audio(hw);
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u32 reg;
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reg = readl_relaxed(zx_audio->reg_base);
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writel_relaxed(reg & ~ZX_AUDIO_EN, zx_audio->reg_base);
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return 0;
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}
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static void zx_audio_disable(struct clk_hw *hw)
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{
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struct clk_zx_audio *zx_audio = to_clk_zx_audio(hw);
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u32 reg;
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reg = readl_relaxed(zx_audio->reg_base);
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writel_relaxed(reg | ZX_AUDIO_EN, zx_audio->reg_base);
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}
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static const struct clk_ops zx_audio_ops = {
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.recalc_rate = zx_audio_recalc_rate,
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.round_rate = zx_audio_round_rate,
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.set_rate = zx_audio_set_rate,
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.enable = zx_audio_enable,
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.disable = zx_audio_disable,
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};
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struct clk *clk_register_zx_audio(const char *name,
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const char * const parent_name,
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unsigned long flags,
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void __iomem *reg_base)
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{
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struct clk_zx_audio *zx_audio;
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struct clk *clk;
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struct clk_init_data init;
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zx_audio = kzalloc(sizeof(*zx_audio), GFP_KERNEL);
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if (!zx_audio)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.ops = &zx_audio_ops;
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init.flags = flags;
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init.parent_names = parent_name ? &parent_name : NULL;
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init.num_parents = parent_name ? 1 : 0;
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zx_audio->reg_base = reg_base;
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zx_audio->hw.init = &init;
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clk = clk_register(NULL, &zx_audio->hw);
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if (IS_ERR(clk))
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kfree(zx_audio);
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return clk;
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}
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