linux/drivers/clk/qcom/clk-spmi-pmic-div.c
Thomas Gleixner 97fb5e8d9b treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 284
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 and
  only version 2 as published by the free software foundation this
  program is distributed in the hope that it will be useful but
  without any warranty without even the implied warranty of
  merchantability or fitness for a particular purpose see the gnu
  general public license for more details

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 294 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190529141900.825281744@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:36:37 +02:00

294 lines
6.9 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2017, The Linux Foundation. All rights reserved.
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/log2.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/types.h>
#define REG_DIV_CTL1 0x43
#define DIV_CTL1_DIV_FACTOR_MASK GENMASK(2, 0)
#define REG_EN_CTL 0x46
#define REG_EN_MASK BIT(7)
struct clkdiv {
struct regmap *regmap;
u16 base;
spinlock_t lock;
struct clk_hw hw;
unsigned int cxo_period_ns;
};
static inline struct clkdiv *to_clkdiv(struct clk_hw *hw)
{
return container_of(hw, struct clkdiv, hw);
}
static inline unsigned int div_factor_to_div(unsigned int div_factor)
{
if (!div_factor)
div_factor = 1;
return 1 << (div_factor - 1);
}
static inline unsigned int div_to_div_factor(unsigned int div)
{
return min(ilog2(div) + 1, 7);
}
static bool is_spmi_pmic_clkdiv_enabled(struct clkdiv *clkdiv)
{
unsigned int val = 0;
regmap_read(clkdiv->regmap, clkdiv->base + REG_EN_CTL, &val);
return val & REG_EN_MASK;
}
static int
__spmi_pmic_clkdiv_set_enable_state(struct clkdiv *clkdiv, bool enable,
unsigned int div_factor)
{
int ret;
unsigned int ns = clkdiv->cxo_period_ns;
unsigned int div = div_factor_to_div(div_factor);
ret = regmap_update_bits(clkdiv->regmap, clkdiv->base + REG_EN_CTL,
REG_EN_MASK, enable ? REG_EN_MASK : 0);
if (ret)
return ret;
if (enable)
ndelay((2 + 3 * div) * ns);
else
ndelay(3 * div * ns);
return 0;
}
static int spmi_pmic_clkdiv_set_enable_state(struct clkdiv *clkdiv, bool enable)
{
unsigned int div_factor;
regmap_read(clkdiv->regmap, clkdiv->base + REG_DIV_CTL1, &div_factor);
div_factor &= DIV_CTL1_DIV_FACTOR_MASK;
return __spmi_pmic_clkdiv_set_enable_state(clkdiv, enable, div_factor);
}
static int clk_spmi_pmic_div_enable(struct clk_hw *hw)
{
struct clkdiv *clkdiv = to_clkdiv(hw);
unsigned long flags;
int ret;
spin_lock_irqsave(&clkdiv->lock, flags);
ret = spmi_pmic_clkdiv_set_enable_state(clkdiv, true);
spin_unlock_irqrestore(&clkdiv->lock, flags);
return ret;
}
static void clk_spmi_pmic_div_disable(struct clk_hw *hw)
{
struct clkdiv *clkdiv = to_clkdiv(hw);
unsigned long flags;
spin_lock_irqsave(&clkdiv->lock, flags);
spmi_pmic_clkdiv_set_enable_state(clkdiv, false);
spin_unlock_irqrestore(&clkdiv->lock, flags);
}
static long clk_spmi_pmic_div_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *parent_rate)
{
unsigned int div, div_factor;
div = DIV_ROUND_UP(*parent_rate, rate);
div_factor = div_to_div_factor(div);
div = div_factor_to_div(div_factor);
return *parent_rate / div;
}
static unsigned long
clk_spmi_pmic_div_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
{
struct clkdiv *clkdiv = to_clkdiv(hw);
unsigned int div_factor;
regmap_read(clkdiv->regmap, clkdiv->base + REG_DIV_CTL1, &div_factor);
div_factor &= DIV_CTL1_DIV_FACTOR_MASK;
return parent_rate / div_factor_to_div(div_factor);
}
static int clk_spmi_pmic_div_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct clkdiv *clkdiv = to_clkdiv(hw);
unsigned int div_factor = div_to_div_factor(parent_rate / rate);
unsigned long flags;
bool enabled;
int ret;
spin_lock_irqsave(&clkdiv->lock, flags);
enabled = is_spmi_pmic_clkdiv_enabled(clkdiv);
if (enabled) {
ret = spmi_pmic_clkdiv_set_enable_state(clkdiv, false);
if (ret)
goto unlock;
}
ret = regmap_update_bits(clkdiv->regmap, clkdiv->base + REG_DIV_CTL1,
DIV_CTL1_DIV_FACTOR_MASK, div_factor);
if (ret)
goto unlock;
if (enabled)
ret = __spmi_pmic_clkdiv_set_enable_state(clkdiv, true,
div_factor);
unlock:
spin_unlock_irqrestore(&clkdiv->lock, flags);
return ret;
}
static const struct clk_ops clk_spmi_pmic_div_ops = {
.enable = clk_spmi_pmic_div_enable,
.disable = clk_spmi_pmic_div_disable,
.set_rate = clk_spmi_pmic_div_set_rate,
.recalc_rate = clk_spmi_pmic_div_recalc_rate,
.round_rate = clk_spmi_pmic_div_round_rate,
};
struct spmi_pmic_div_clk_cc {
int nclks;
struct clkdiv clks[];
};
static struct clk_hw *
spmi_pmic_div_clk_hw_get(struct of_phandle_args *clkspec, void *data)
{
struct spmi_pmic_div_clk_cc *cc = data;
int idx = clkspec->args[0] - 1; /* Start at 1 instead of 0 */
if (idx < 0 || idx >= cc->nclks) {
pr_err("%s: index value %u is invalid; allowed range [1, %d]\n",
__func__, clkspec->args[0], cc->nclks);
return ERR_PTR(-EINVAL);
}
return &cc->clks[idx].hw;
}
static int spmi_pmic_clkdiv_probe(struct platform_device *pdev)
{
struct spmi_pmic_div_clk_cc *cc;
struct clk_init_data init = {};
struct clkdiv *clkdiv;
struct clk *cxo;
struct regmap *regmap;
struct device *dev = &pdev->dev;
struct device_node *of_node = dev->of_node;
const char *parent_name;
int nclks, i, ret, cxo_hz;
char name[20];
u32 start;
ret = of_property_read_u32(of_node, "reg", &start);
if (ret < 0) {
dev_err(dev, "reg property reading failed\n");
return ret;
}
regmap = dev_get_regmap(dev->parent, NULL);
if (!regmap) {
dev_err(dev, "Couldn't get parent's regmap\n");
return -EINVAL;
}
ret = of_property_read_u32(of_node, "qcom,num-clkdivs", &nclks);
if (ret < 0) {
dev_err(dev, "qcom,num-clkdivs property reading failed, ret=%d\n",
ret);
return ret;
}
if (!nclks)
return -EINVAL;
cc = devm_kzalloc(dev, struct_size(cc, clks, nclks), GFP_KERNEL);
if (!cc)
return -ENOMEM;
cc->nclks = nclks;
cxo = clk_get(dev, "xo");
if (IS_ERR(cxo)) {
ret = PTR_ERR(cxo);
if (ret != -EPROBE_DEFER)
dev_err(dev, "failed to get xo clock\n");
return ret;
}
cxo_hz = clk_get_rate(cxo);
clk_put(cxo);
parent_name = of_clk_get_parent_name(of_node, 0);
if (!parent_name) {
dev_err(dev, "missing parent clock\n");
return -ENODEV;
}
init.name = name;
init.parent_names = &parent_name;
init.num_parents = 1;
init.ops = &clk_spmi_pmic_div_ops;
for (i = 0, clkdiv = cc->clks; i < nclks; i++) {
snprintf(name, sizeof(name), "div_clk%d", i + 1);
spin_lock_init(&clkdiv[i].lock);
clkdiv[i].base = start + i * 0x100;
clkdiv[i].regmap = regmap;
clkdiv[i].cxo_period_ns = NSEC_PER_SEC / cxo_hz;
clkdiv[i].hw.init = &init;
ret = devm_clk_hw_register(dev, &clkdiv[i].hw);
if (ret)
return ret;
}
return devm_of_clk_add_hw_provider(dev, spmi_pmic_div_clk_hw_get, cc);
}
static const struct of_device_id spmi_pmic_clkdiv_match_table[] = {
{ .compatible = "qcom,spmi-clkdiv" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, spmi_pmic_clkdiv_match_table);
static struct platform_driver spmi_pmic_clkdiv_driver = {
.driver = {
.name = "qcom,spmi-pmic-clkdiv",
.of_match_table = spmi_pmic_clkdiv_match_table,
},
.probe = spmi_pmic_clkdiv_probe,
};
module_platform_driver(spmi_pmic_clkdiv_driver);
MODULE_DESCRIPTION("QCOM SPMI PMIC clkdiv driver");
MODULE_LICENSE("GPL v2");