345 lines
8.7 KiB
C
345 lines
8.7 KiB
C
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/*
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* clk-max77686.c - Clock driver for Maxim 77686/MAX77802
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*
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* Copyright (C) 2012 Samsung Electornics
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* Jonghwa Lee <jonghwa3.lee@samsung.com>
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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 as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/max77620.h>
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#include <linux/mfd/max77686.h>
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#include <linux/mfd/max77686-private.h>
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#include <linux/clk-provider.h>
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#include <linux/mutex.h>
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#include <linux/clkdev.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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#include <dt-bindings/clock/maxim,max77686.h>
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#include <dt-bindings/clock/maxim,max77802.h>
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#include <dt-bindings/clock/maxim,max77620.h>
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#define MAX77802_CLOCK_LOW_JITTER_SHIFT 0x3
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enum max77686_chip_name {
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CHIP_MAX77686,
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CHIP_MAX77802,
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CHIP_MAX77620,
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};
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struct max77686_hw_clk_info {
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const char *name;
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u32 clk_reg;
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u32 clk_enable_mask;
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u32 flags;
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};
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struct max77686_clk_init_data {
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struct regmap *regmap;
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struct clk_hw hw;
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struct clk_init_data clk_idata;
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const struct max77686_hw_clk_info *clk_info;
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};
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struct max77686_clk_driver_data {
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enum max77686_chip_name chip;
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struct max77686_clk_init_data *max_clk_data;
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size_t num_clks;
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};
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static const struct
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max77686_hw_clk_info max77686_hw_clks_info[MAX77686_CLKS_NUM] = {
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[MAX77686_CLK_AP] = {
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.name = "32khz_ap",
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.clk_reg = MAX77686_REG_32KHZ,
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.clk_enable_mask = BIT(MAX77686_CLK_AP),
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},
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[MAX77686_CLK_CP] = {
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.name = "32khz_cp",
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.clk_reg = MAX77686_REG_32KHZ,
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.clk_enable_mask = BIT(MAX77686_CLK_CP),
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},
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[MAX77686_CLK_PMIC] = {
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.name = "32khz_pmic",
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.clk_reg = MAX77686_REG_32KHZ,
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.clk_enable_mask = BIT(MAX77686_CLK_PMIC),
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},
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};
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static const struct
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max77686_hw_clk_info max77802_hw_clks_info[MAX77802_CLKS_NUM] = {
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[MAX77802_CLK_32K_AP] = {
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.name = "32khz_ap",
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.clk_reg = MAX77802_REG_32KHZ,
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.clk_enable_mask = BIT(MAX77802_CLK_32K_AP),
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},
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[MAX77802_CLK_32K_CP] = {
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.name = "32khz_cp",
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.clk_reg = MAX77802_REG_32KHZ,
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.clk_enable_mask = BIT(MAX77802_CLK_32K_CP),
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},
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};
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static const struct
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max77686_hw_clk_info max77620_hw_clks_info[MAX77620_CLKS_NUM] = {
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[MAX77620_CLK_32K_OUT0] = {
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.name = "32khz_out0",
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.clk_reg = MAX77620_REG_CNFG1_32K,
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.clk_enable_mask = MAX77620_CNFG1_32K_OUT0_EN,
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.flags = CLK_IGNORE_UNUSED,
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},
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};
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static struct max77686_clk_init_data *to_max77686_clk_init_data(
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struct clk_hw *hw)
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{
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return container_of(hw, struct max77686_clk_init_data, hw);
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}
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static int max77686_clk_prepare(struct clk_hw *hw)
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{
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struct max77686_clk_init_data *max77686 = to_max77686_clk_init_data(hw);
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return regmap_update_bits(max77686->regmap, max77686->clk_info->clk_reg,
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max77686->clk_info->clk_enable_mask,
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max77686->clk_info->clk_enable_mask);
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}
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static void max77686_clk_unprepare(struct clk_hw *hw)
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{
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struct max77686_clk_init_data *max77686 = to_max77686_clk_init_data(hw);
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regmap_update_bits(max77686->regmap, max77686->clk_info->clk_reg,
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max77686->clk_info->clk_enable_mask,
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~max77686->clk_info->clk_enable_mask);
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}
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static int max77686_clk_is_prepared(struct clk_hw *hw)
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{
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struct max77686_clk_init_data *max77686 = to_max77686_clk_init_data(hw);
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int ret;
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u32 val;
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ret = regmap_read(max77686->regmap, max77686->clk_info->clk_reg, &val);
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if (ret < 0)
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return -EINVAL;
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return val & max77686->clk_info->clk_enable_mask;
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}
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static unsigned long max77686_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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return 32768;
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}
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static struct clk_ops max77686_clk_ops = {
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.prepare = max77686_clk_prepare,
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.unprepare = max77686_clk_unprepare,
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.is_prepared = max77686_clk_is_prepared,
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.recalc_rate = max77686_recalc_rate,
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};
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static struct clk_hw *
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of_clk_max77686_get(struct of_phandle_args *clkspec, void *data)
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{
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struct max77686_clk_driver_data *drv_data = data;
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unsigned int idx = clkspec->args[0];
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if (idx >= drv_data->num_clks) {
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pr_err("%s: invalid index %u\n", __func__, idx);
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return ERR_PTR(-EINVAL);
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}
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return &drv_data->max_clk_data[idx].hw;
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}
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static int max77686_clk_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device *parent = dev->parent;
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const struct platform_device_id *id = platform_get_device_id(pdev);
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struct max77686_clk_driver_data *drv_data;
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struct max77686_clk_init_data *max_clk_data;
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const struct max77686_hw_clk_info *hw_clks;
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struct regmap *regmap;
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int i, ret, num_clks;
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drv_data = devm_kzalloc(dev, sizeof(*drv_data), GFP_KERNEL);
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if (!drv_data)
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return -ENOMEM;
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regmap = dev_get_regmap(parent, NULL);
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if (!regmap) {
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dev_err(dev, "Failed to get rtc regmap\n");
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return -ENODEV;
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}
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drv_data->chip = id->driver_data;
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switch (drv_data->chip) {
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case CHIP_MAX77686:
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num_clks = MAX77686_CLKS_NUM;
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hw_clks = max77686_hw_clks_info;
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break;
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case CHIP_MAX77802:
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num_clks = MAX77802_CLKS_NUM;
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hw_clks = max77802_hw_clks_info;
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break;
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case CHIP_MAX77620:
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num_clks = MAX77620_CLKS_NUM;
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hw_clks = max77620_hw_clks_info;
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break;
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default:
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dev_err(dev, "Unknown Chip ID\n");
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return -EINVAL;
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}
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drv_data->num_clks = num_clks;
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drv_data->max_clk_data = devm_kcalloc(dev, num_clks,
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sizeof(*drv_data->max_clk_data),
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GFP_KERNEL);
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if (!drv_data->max_clk_data)
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return -ENOMEM;
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for (i = 0; i < num_clks; i++) {
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const char *clk_name;
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max_clk_data = &drv_data->max_clk_data[i];
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max_clk_data->regmap = regmap;
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max_clk_data->clk_info = &hw_clks[i];
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max_clk_data->clk_idata.flags = hw_clks[i].flags;
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max_clk_data->clk_idata.ops = &max77686_clk_ops;
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if (parent->of_node &&
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!of_property_read_string_index(parent->of_node,
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"clock-output-names",
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i, &clk_name))
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max_clk_data->clk_idata.name = clk_name;
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else
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max_clk_data->clk_idata.name = hw_clks[i].name;
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max_clk_data->hw.init = &max_clk_data->clk_idata;
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ret = devm_clk_hw_register(dev, &max_clk_data->hw);
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if (ret) {
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dev_err(dev, "Failed to clock register: %d\n", ret);
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return ret;
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}
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ret = clk_hw_register_clkdev(&max_clk_data->hw,
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max_clk_data->clk_idata.name, NULL);
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if (ret < 0) {
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dev_err(dev, "Failed to clkdev register: %d\n", ret);
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return ret;
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}
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}
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if ((drv_data->chip == CHIP_MAX77620) && parent->of_node) {
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bool en_clk32k;
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en_clk32k = of_property_read_bool(parent->of_node,
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"maxim,enable-clock32k-out");
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if (!en_clk32k)
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en_clk32k = of_property_read_bool(parent->of_node,
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"enable-clock32k-out");
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if (en_clk32k) {
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max_clk_data =
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&drv_data->max_clk_data[MAX77620_CLK_32K_OUT0];
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ret = max77686_clk_prepare(&max_clk_data->hw);
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if (ret < 0) {
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dev_err(dev,
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"Fail to enable clk32k out %d\n", ret);
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return ret;
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}
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}
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}
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if (parent->of_node) {
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ret = of_clk_add_hw_provider(parent->of_node, of_clk_max77686_get,
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drv_data);
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if (ret < 0) {
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dev_err(dev, "Failed to register OF clock provider: %d\n",
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ret);
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return ret;
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}
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}
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/* MAX77802: Enable low-jitter mode on the 32khz clocks. */
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if (drv_data->chip == CHIP_MAX77802) {
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ret = regmap_update_bits(regmap, MAX77802_REG_32KHZ,
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1 << MAX77802_CLOCK_LOW_JITTER_SHIFT,
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1 << MAX77802_CLOCK_LOW_JITTER_SHIFT);
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if (ret < 0) {
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dev_err(dev, "Failed to config low-jitter: %d\n", ret);
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goto remove_of_clk_provider;
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}
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}
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return 0;
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remove_of_clk_provider:
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if (parent->of_node)
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of_clk_del_provider(parent->of_node);
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return ret;
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}
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static int max77686_clk_remove(struct platform_device *pdev)
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{
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struct device *parent = pdev->dev.parent;
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if (parent->of_node)
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of_clk_del_provider(parent->of_node);
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return 0;
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}
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static const struct platform_device_id max77686_clk_id[] = {
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{ "max77686-clk", .driver_data = CHIP_MAX77686, },
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{ "max77802-clk", .driver_data = CHIP_MAX77802, },
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{ "max77620-clock", .driver_data = CHIP_MAX77620, },
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{},
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};
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MODULE_DEVICE_TABLE(platform, max77686_clk_id);
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static struct platform_driver max77686_clk_driver = {
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.driver = {
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.name = "max77686-clk",
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},
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.probe = max77686_clk_probe,
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.remove = max77686_clk_remove,
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.id_table = max77686_clk_id,
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};
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module_platform_driver(max77686_clk_driver);
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MODULE_DESCRIPTION("MAXIM 77686 Clock Driver");
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MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
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MODULE_LICENSE("GPL");
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