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kernel/drivers/clk/clk-si544.c
Mike Looijmans e8f127caf6 clk-si514, clk-si544: Implement prepare/unprepare/is_prepared operations 
This adds prepare/unprepare/is_prepared functionality to the drivers for
the SI544 and SI514 chips, allowing the clock output to be disabled when
the clock is not in use.

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2018-06-29 10:59:40 -07:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Driver for Silicon Labs Si544 Programmable Oscillator
* Copyright (C) 2018 Topic Embedded Products
* Author: Mike Looijmans <mike.looijmans@topic.nl>
*/
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/slab.h>
/* I2C registers (decimal as in datasheet) */
#define SI544_REG_CONTROL 7
#define SI544_REG_OE_STATE 17
#define SI544_REG_HS_DIV 23
#define SI544_REG_LS_HS_DIV 24
#define SI544_REG_FBDIV0 26
#define SI544_REG_FBDIV8 27
#define SI544_REG_FBDIV16 28
#define SI544_REG_FBDIV24 29
#define SI544_REG_FBDIV32 30
#define SI544_REG_FBDIV40 31
#define SI544_REG_FCAL_OVR 69
#define SI544_REG_ADPLL_DELTA_M0 231
#define SI544_REG_ADPLL_DELTA_M8 232
#define SI544_REG_ADPLL_DELTA_M16 233
#define SI544_REG_PAGE_SELECT 255
/* Register values */
#define SI544_CONTROL_RESET BIT(7)
#define SI544_CONTROL_MS_ICAL2 BIT(3)
#define SI544_OE_STATE_ODC_OE BIT(0)
/* Max freq depends on speed grade */
#define SI544_MIN_FREQ 200000U
/* Si544 Internal oscilator runs at 55.05 MHz */
#define FXO 55050000U
/* VCO range is 10.8 .. 12.1 GHz, max depends on speed grade */
#define FVCO_MIN 10800000000ULL
#define HS_DIV_MAX 2046
#define HS_DIV_MAX_ODD 33
/* Lowest frequency synthesizeable using only the HS divider */
#define MIN_HSDIV_FREQ (FVCO_MIN / HS_DIV_MAX)
enum si544_speed_grade {
si544a,
si544b,
si544c,
};
struct clk_si544 {
struct clk_hw hw;
struct regmap *regmap;
struct i2c_client *i2c_client;
enum si544_speed_grade speed_grade;
};
#define to_clk_si544(_hw) container_of(_hw, struct clk_si544, hw)
/**
* struct clk_si544_muldiv - Multiplier/divider settings
* @fb_div_frac: integer part of feedback divider (32 bits)
* @fb_div_int: fractional part of feedback divider (11 bits)
* @hs_div: 1st divider, 5..2046, must be even when >33
* @ls_div_bits: 2nd divider, as 2^x, range 0..5
* If ls_div_bits is non-zero, hs_div must be even
*/
struct clk_si544_muldiv {
u32 fb_div_frac;
u16 fb_div_int;
u16 hs_div;
u8 ls_div_bits;
};
/* Enables or disables the output driver */
static int si544_enable_output(struct clk_si544 *data, bool enable)
{
return regmap_update_bits(data->regmap, SI544_REG_OE_STATE,
SI544_OE_STATE_ODC_OE, enable ? SI544_OE_STATE_ODC_OE : 0);
}
static int si544_prepare(struct clk_hw *hw)
{
struct clk_si544 *data = to_clk_si544(hw);
return si544_enable_output(data, true);
}
static void si544_unprepare(struct clk_hw *hw)
{
struct clk_si544 *data = to_clk_si544(hw);
si544_enable_output(data, false);
}
static int si544_is_prepared(struct clk_hw *hw)
{
struct clk_si544 *data = to_clk_si544(hw);
unsigned int val;
int err;
err = regmap_read(data->regmap, SI544_REG_OE_STATE, &val);
if (err < 0)
return err;
return !!(val & SI544_OE_STATE_ODC_OE);
}
/* Retrieve clock multiplier and dividers from hardware */
static int si544_get_muldiv(struct clk_si544 *data,
struct clk_si544_muldiv *settings)
{
int err;
u8 reg[6];
err = regmap_bulk_read(data->regmap, SI544_REG_HS_DIV, reg, 2);
if (err)
return err;
settings->ls_div_bits = (reg[1] >> 4) & 0x07;
settings->hs_div = (reg[1] & 0x07) << 8 | reg[0];
err = regmap_bulk_read(data->regmap, SI544_REG_FBDIV0, reg, 6);
if (err)
return err;
settings->fb_div_int = reg[4] | (reg[5] & 0x07) << 8;
settings->fb_div_frac = reg[0] | reg[1] << 8 | reg[2] << 16 |
reg[3] << 24;
return 0;
}
static int si544_set_muldiv(struct clk_si544 *data,
struct clk_si544_muldiv *settings)
{
int err;
u8 reg[6];
reg[0] = settings->hs_div;
reg[1] = settings->hs_div >> 8 | settings->ls_div_bits << 4;
err = regmap_bulk_write(data->regmap, SI544_REG_HS_DIV, reg, 2);
if (err < 0)
return err;
reg[0] = settings->fb_div_frac;
reg[1] = settings->fb_div_frac >> 8;
reg[2] = settings->fb_div_frac >> 16;
reg[3] = settings->fb_div_frac >> 24;
reg[4] = settings->fb_div_int;
reg[5] = settings->fb_div_int >> 8;
/*
* Writing to SI544_REG_FBDIV40 triggers the clock change, so that
* must be written last
*/
return regmap_bulk_write(data->regmap, SI544_REG_FBDIV0, reg, 6);
}
static bool is_valid_frequency(const struct clk_si544 *data,
unsigned long frequency)
{
unsigned long max_freq = 0;
if (frequency < SI544_MIN_FREQ)
return false;
switch (data->speed_grade) {
case si544a:
max_freq = 1500000000;
break;
case si544b:
max_freq = 800000000;
break;
case si544c:
max_freq = 350000000;
break;
}
return frequency <= max_freq;
}
/* Calculate divider settings for a given frequency */
static int si544_calc_muldiv(struct clk_si544_muldiv *settings,
unsigned long frequency)
{
u64 vco;
u32 ls_freq;
u32 tmp;
u8 res;
/* Determine the minimum value of LS_DIV and resulting target freq. */
ls_freq = frequency;
settings->ls_div_bits = 0;
if (frequency >= MIN_HSDIV_FREQ) {
settings->ls_div_bits = 0;
} else {
res = 1;
tmp = 2 * HS_DIV_MAX;
while (tmp <= (HS_DIV_MAX * 32)) {
if (((u64)frequency * tmp) >= FVCO_MIN)
break;
++res;
tmp <<= 1;
}
settings->ls_div_bits = res;
ls_freq = frequency << res;
}
/* Determine minimum HS_DIV by rounding up */
vco = FVCO_MIN + ls_freq - 1;
do_div(vco, ls_freq);
settings->hs_div = vco;
/* round up to even number when required */
if ((settings->hs_div & 1) &&
(settings->hs_div > HS_DIV_MAX_ODD || settings->ls_div_bits))
++settings->hs_div;
/* Calculate VCO frequency (in 10..12GHz range) */
vco = (u64)ls_freq * settings->hs_div;
/* Calculate the integer part of the feedback divider */
tmp = do_div(vco, FXO);
settings->fb_div_int = vco;
/* And the fractional bits using the remainder */
vco = (u64)tmp << 32;
vco += FXO / 2; /* Round to nearest multiple */
do_div(vco, FXO);
settings->fb_div_frac = vco;
return 0;
}
/* Calculate resulting frequency given the register settings */
static unsigned long si544_calc_rate(struct clk_si544_muldiv *settings)
{
u32 d = settings->hs_div * BIT(settings->ls_div_bits);
u64 vco;
/* Calculate VCO from the fractional part */
vco = (u64)settings->fb_div_frac * FXO;
vco += (FXO / 2);
vco >>= 32;
/* Add the integer part of the VCO frequency */
vco += (u64)settings->fb_div_int * FXO;
/* Apply divider to obtain the generated frequency */
do_div(vco, d);
return vco;
}
static unsigned long si544_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_si544 *data = to_clk_si544(hw);
struct clk_si544_muldiv settings;
int err;
err = si544_get_muldiv(data, &settings);
if (err)
return 0;
return si544_calc_rate(&settings);
}
static long si544_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *parent_rate)
{
struct clk_si544 *data = to_clk_si544(hw);
struct clk_si544_muldiv settings;
int err;
if (!is_valid_frequency(data, rate))
return -EINVAL;
err = si544_calc_muldiv(&settings, rate);
if (err)
return err;
return si544_calc_rate(&settings);
}
/*
* Update output frequency for "big" frequency changes
*/
static int si544_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct clk_si544 *data = to_clk_si544(hw);
struct clk_si544_muldiv settings;
unsigned int old_oe_state;
int err;
if (!is_valid_frequency(data, rate))
return -EINVAL;
err = si544_calc_muldiv(&settings, rate);
if (err)
return err;
err = regmap_read(data->regmap, SI544_REG_OE_STATE, &old_oe_state);
if (err)
return err;
si544_enable_output(data, false);
/* Allow FCAL for this frequency update */
err = regmap_write(data->regmap, SI544_REG_FCAL_OVR, 0);
if (err < 0)
return err;
err = si544_set_muldiv(data, &settings);
if (err < 0)
return err; /* Undefined state now, best to leave disabled */
/* Trigger calibration */
err = regmap_write(data->regmap, SI544_REG_CONTROL,
SI544_CONTROL_MS_ICAL2);
if (err < 0)
return err;
/* Applying a new frequency can take up to 10ms */
usleep_range(10000, 12000);
if (old_oe_state & SI544_OE_STATE_ODC_OE)
si544_enable_output(data, true);
return err;
}
static const struct clk_ops si544_clk_ops = {
.prepare = si544_prepare,
.unprepare = si544_unprepare,
.is_prepared = si544_is_prepared,
.recalc_rate = si544_recalc_rate,
.round_rate = si544_round_rate,
.set_rate = si544_set_rate,
};
static bool si544_regmap_is_volatile(struct device *dev, unsigned int reg)
{
switch (reg) {
case SI544_REG_CONTROL:
case SI544_REG_FCAL_OVR:
return true;
default:
return false;
}
}
static const struct regmap_config si544_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.cache_type = REGCACHE_RBTREE,
.max_register = SI544_REG_PAGE_SELECT,
.volatile_reg = si544_regmap_is_volatile,
};
static int si544_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct clk_si544 *data;
struct clk_init_data init;
int err;
data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
init.ops = &si544_clk_ops;
init.flags = 0;
init.num_parents = 0;
data->hw.init = &init;
data->i2c_client = client;
data->speed_grade = id->driver_data;
if (of_property_read_string(client->dev.of_node, "clock-output-names",
&init.name))
init.name = client->dev.of_node->name;
data->regmap = devm_regmap_init_i2c(client, &si544_regmap_config);
if (IS_ERR(data->regmap))
return PTR_ERR(data->regmap);
i2c_set_clientdata(client, data);
/* Select page 0, just to be sure, there appear to be no more */
err = regmap_write(data->regmap, SI544_REG_PAGE_SELECT, 0);
if (err < 0)
return err;
err = devm_clk_hw_register(&client->dev, &data->hw);
if (err) {
dev_err(&client->dev, "clock registration failed\n");
return err;
}
err = devm_of_clk_add_hw_provider(&client->dev, of_clk_hw_simple_get,
&data->hw);
if (err) {
dev_err(&client->dev, "unable to add clk provider\n");
return err;
}
return 0;
}
static const struct i2c_device_id si544_id[] = {
{ "si544a", si544a },
{ "si544b", si544b },
{ "si544c", si544c },
{ }
};
MODULE_DEVICE_TABLE(i2c, si544_id);
static const struct of_device_id clk_si544_of_match[] = {
{ .compatible = "silabs,si544a" },
{ .compatible = "silabs,si544b" },
{ .compatible = "silabs,si544c" },
{ },
};
MODULE_DEVICE_TABLE(of, clk_si544_of_match);
static struct i2c_driver si544_driver = {
.driver = {
.name = "si544",
.of_match_table = clk_si544_of_match,
},
.probe = si544_probe,
.id_table = si544_id,
};
module_i2c_driver(si544_driver);
MODULE_AUTHOR("Mike Looijmans <mike.looijmans@topic.nl>");
MODULE_DESCRIPTION("Si544 driver");
MODULE_LICENSE("GPL");
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