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