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// SPDX-License-Identifier: GPL-2.0
/*
* Qualcomm A53 PLL driver
*
* Copyright (c) 2017, Linaro Limited
* Author: Georgi Djakov <georgi.djakov@linaro.org>
*/
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/regmap.h>
#include <linux/module.h>
#include "clk-pll.h"
#include "clk-regmap.h"
static const struct pll_freq_tbl a53pll_freq[] = {
{ 998400000, 52, 0x0, 0x1, 0 },
{ 1094400000, 57, 0x0, 0x1, 0 },
{ 1152000000, 62, 0x0, 0x1, 0 },
{ 1209600000, 63, 0x0, 0x1, 0 },
{ 1248000000, 65, 0x0, 0x1, 0 },
{ 1363200000, 71, 0x0, 0x1, 0 },
{ 1401600000, 73, 0x0, 0x1, 0 },
{ }
};
static const struct regmap_config a53pll_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = 0x40,
.fast_io = true,
};
static struct pll_freq_tbl *qcom_a53pll_get_freq_tbl(struct device *dev)
{
struct pll_freq_tbl *freq_tbl;
unsigned long xo_freq;
unsigned long freq;
struct clk *xo_clk;
int count;
int ret;
int i;
xo_clk = devm_clk_get(dev, "xo");
if (IS_ERR(xo_clk))
return NULL;
xo_freq = clk_get_rate(xo_clk);
ret = devm_pm_opp_of_add_table(dev);
if (ret)
return NULL;
count = dev_pm_opp_get_opp_count(dev);
if (count <= 0)
return NULL;
freq_tbl = devm_kcalloc(dev, count + 1, sizeof(*freq_tbl), GFP_KERNEL);
if (!freq_tbl)
return NULL;
for (i = 0, freq = 0; i < count; i++, freq++) {
struct dev_pm_opp *opp;
opp = dev_pm_opp_find_freq_ceil(dev, &freq);
if (IS_ERR(opp))
return NULL;
/* Skip the freq that is not divisible */
if (freq % xo_freq)
continue;
freq_tbl[i].freq = freq;
freq_tbl[i].l = freq / xo_freq;
freq_tbl[i].n = 1;
dev_pm_opp_put(opp);
}
return freq_tbl;
}
static int qcom_a53pll_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct regmap *regmap;
struct clk_pll *pll;
void __iomem *base;
struct clk_init_data init = { };
int ret;
pll = devm_kzalloc(dev, sizeof(*pll), GFP_KERNEL);
if (!pll)
return -ENOMEM;
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
return PTR_ERR(base);
regmap = devm_regmap_init_mmio(dev, base, &a53pll_regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
pll->l_reg = 0x04;
pll->m_reg = 0x08;
pll->n_reg = 0x0c;
pll->config_reg = 0x14;
pll->mode_reg = 0x00;
pll->status_reg = 0x1c;
pll->status_bit = 16;
pll->freq_tbl = qcom_a53pll_get_freq_tbl(dev);
if (!pll->freq_tbl) {
/* Fall on a53pll_freq if no freq_tbl is found from OPP */
pll->freq_tbl = a53pll_freq;
}
/* Use an unique name by appending @unit-address */
init.name = devm_kasprintf(dev, GFP_KERNEL, "a53pll%s",
strchrnul(np->full_name, '@'));
if (!init.name)
return -ENOMEM;
init.parent_names = (const char *[]){ "xo" };
init.num_parents = 1;
init.ops = &clk_pll_sr2_ops;
pll->clkr.hw.init = &init;
ret = devm_clk_register_regmap(dev, &pll->clkr);
if (ret) {
dev_err(dev, "failed to register regmap clock: %d\n", ret);
return ret;
}
ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
&pll->clkr.hw);
if (ret) {
dev_err(dev, "failed to add clock provider: %d\n", ret);
return ret;
}
return 0;
}
static const struct of_device_id qcom_a53pll_match_table[] = {
{ .compatible = "qcom,msm8916-a53pll" },
{ .compatible = "qcom,msm8939-a53pll" },
{ }
};
MODULE_DEVICE_TABLE(of, qcom_a53pll_match_table);
static struct platform_driver qcom_a53pll_driver = {
.probe = qcom_a53pll_probe,
.driver = {
.name = "qcom-a53pll",
.of_match_table = qcom_a53pll_match_table,
},
};
module_platform_driver(qcom_a53pll_driver);
MODULE_DESCRIPTION("Qualcomm A53 PLL Driver");
MODULE_LICENSE("GPL v2");
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