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clk-si5351.c
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/*
* clk-si5351.c: Silicon Laboratories Si5351A/B/C I2C Clock Generator
*
* Sebastian Hesselbarth <[email protected]>
* Rabeeh Khoury <[email protected]>
*
* References:
* [1] "Si5351A/B/C Data Sheet"
* http://www.silabs.com/Support%20Documents/TechnicalDocs/Si5351.pdf
* [2] "Manually Generating an Si5351 Register Map"
* http://www.silabs.com/Support%20Documents/TechnicalDocs/AN619.pdf
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/rational.h>
#include <linux/i2c.h>
#include <linux/of_platform.h>
#include <linux/platform_data/si5351.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <asm/div64.h>
#include "clk-si5351.h"
struct si5351_driver_data;
struct si5351_parameters {
unsigned long p1;
unsigned long p2;
unsigned long p3;
int valid;
};
struct si5351_hw_data {
struct clk_hw hw;
struct si5351_driver_data *drvdata;
struct si5351_parameters params;
unsigned char num;
};
struct si5351_driver_data {
enum si5351_variant variant;
struct i2c_client *client;
struct regmap *regmap;
struct clk *pxtal;
const char *pxtal_name;
struct clk_hw xtal;
struct clk *pclkin;
const char *pclkin_name;
struct clk_hw clkin;
struct si5351_hw_data pll[2];
struct si5351_hw_data *msynth;
struct si5351_hw_data *clkout;
size_t num_clkout;
};
static const char * const si5351_input_names[] = {
"xtal", "clkin"
};
static const char * const si5351_pll_names[] = {
"plla", "pllb", "vxco"
};
static const char * const si5351_msynth_names[] = {
"ms0", "ms1", "ms2", "ms3", "ms4", "ms5", "ms6", "ms7"
};
static const char * const si5351_clkout_names[] = {
"clk0", "clk1", "clk2", "clk3", "clk4", "clk5", "clk6", "clk7"
};
/*
* Si5351 i2c regmap
*/
static inline u8 si5351_reg_read(struct si5351_driver_data *drvdata, u8 reg)
{
u32 val;
int ret;
ret = regmap_read(drvdata->regmap, reg, &val);
if (ret) {
dev_err(&drvdata->client->dev,
"unable to read from reg%02x\n", reg);
return 0;
}
return (u8)val;
}
static inline int si5351_bulk_read(struct si5351_driver_data *drvdata,
u8 reg, u8 count, u8 *buf)
{
return regmap_bulk_read(drvdata->regmap, reg, buf, count);
}
static inline int si5351_reg_write(struct si5351_driver_data *drvdata,
u8 reg, u8 val)
{
return regmap_write(drvdata->regmap, reg, val);
}
static inline int si5351_bulk_write(struct si5351_driver_data *drvdata,
u8 reg, u8 count, const u8 *buf)
{
return regmap_raw_write(drvdata->regmap, reg, buf, count);
}
static inline int si5351_set_bits(struct si5351_driver_data *drvdata,
u8 reg, u8 mask, u8 val)
{
return regmap_update_bits(drvdata->regmap, reg, mask, val);
}
static inline u8 si5351_msynth_params_address(int num)
{
if (num > 5)
return SI5351_CLK6_PARAMETERS + (num - 6);
return SI5351_CLK0_PARAMETERS + (SI5351_PARAMETERS_LENGTH * num);
}
static void si5351_read_parameters(struct si5351_driver_data *drvdata,
u8 reg, struct si5351_parameters *params)
{
u8 buf[SI5351_PARAMETERS_LENGTH];
switch (reg) {
case SI5351_CLK6_PARAMETERS:
case SI5351_CLK7_PARAMETERS:
buf[0] = si5351_reg_read(drvdata, reg);
params->p1 = buf[0];
params->p2 = 0;
params->p3 = 1;
break;
default:
si5351_bulk_read(drvdata, reg, SI5351_PARAMETERS_LENGTH, buf);
params->p1 = ((buf[2] & 0x03) << 16) | (buf[3] << 8) | buf[4];
params->p2 = ((buf[5] & 0x0f) << 16) | (buf[6] << 8) | buf[7];
params->p3 = ((buf[5] & 0xf0) << 12) | (buf[0] << 8) | buf[1];
}
params->valid = 1;
}
static void si5351_write_parameters(struct si5351_driver_data *drvdata,
u8 reg, struct si5351_parameters *params)
{
u8 buf[SI5351_PARAMETERS_LENGTH];
switch (reg) {
case SI5351_CLK6_PARAMETERS:
case SI5351_CLK7_PARAMETERS:
buf[0] = params->p1 & 0xff;
si5351_reg_write(drvdata, reg, buf[0]);
break;
default:
buf[0] = ((params->p3 & 0x0ff00) >> 8) & 0xff;
buf[1] = params->p3 & 0xff;
/* save rdiv and divby4 */
buf[2] = si5351_reg_read(drvdata, reg + 2) & ~0x03;
buf[2] |= ((params->p1 & 0x30000) >> 16) & 0x03;
buf[3] = ((params->p1 & 0x0ff00) >> 8) & 0xff;
buf[4] = params->p1 & 0xff;
buf[5] = ((params->p3 & 0xf0000) >> 12) |
((params->p2 & 0xf0000) >> 16);
buf[6] = ((params->p2 & 0x0ff00) >> 8) & 0xff;
buf[7] = params->p2 & 0xff;
si5351_bulk_write(drvdata, reg, SI5351_PARAMETERS_LENGTH, buf);
}
}
static bool si5351_regmap_is_volatile(struct device *dev, unsigned int reg)
{
switch (reg) {
case SI5351_DEVICE_STATUS:
case SI5351_INTERRUPT_STATUS:
case SI5351_PLL_RESET:
return true;
}
return false;
}
static bool si5351_regmap_is_writeable(struct device *dev, unsigned int reg)
{
/* reserved registers */
if (reg >= 4 && reg <= 8)
return false;
if (reg >= 10 && reg <= 14)
return false;
if (reg >= 173 && reg <= 176)
return false;
if (reg >= 178 && reg <= 182)
return false;
/* read-only */
if (reg == SI5351_DEVICE_STATUS)
return false;
return true;
}
static const struct regmap_config si5351_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.cache_type = REGCACHE_RBTREE,
.max_register = 187,
.writeable_reg = si5351_regmap_is_writeable,
.volatile_reg = si5351_regmap_is_volatile,
};
/*
* Si5351 xtal clock input
*/
static int si5351_xtal_prepare(struct clk_hw *hw)
{
struct si5351_driver_data *drvdata =
container_of(hw, struct si5351_driver_data, xtal);
si5351_set_bits(drvdata, SI5351_FANOUT_ENABLE,
SI5351_XTAL_ENABLE, SI5351_XTAL_ENABLE);
return 0;
}
static void si5351_xtal_unprepare(struct clk_hw *hw)
{
struct si5351_driver_data *drvdata =
container_of(hw, struct si5351_driver_data, xtal);
si5351_set_bits(drvdata, SI5351_FANOUT_ENABLE,
SI5351_XTAL_ENABLE, 0);
}
static const struct clk_ops si5351_xtal_ops = {
.prepare = si5351_xtal_prepare,
.unprepare = si5351_xtal_unprepare,
};
/*
* Si5351 clkin clock input (Si5351C only)
*/
static int si5351_clkin_prepare(struct clk_hw *hw)
{
struct si5351_driver_data *drvdata =
container_of(hw, struct si5351_driver_data, clkin);
si5351_set_bits(drvdata, SI5351_FANOUT_ENABLE,
SI5351_CLKIN_ENABLE, SI5351_CLKIN_ENABLE);
return 0;
}
static void si5351_clkin_unprepare(struct clk_hw *hw)
{
struct si5351_driver_data *drvdata =
container_of(hw, struct si5351_driver_data, clkin);
si5351_set_bits(drvdata, SI5351_FANOUT_ENABLE,
SI5351_CLKIN_ENABLE, 0);
}
/*
* CMOS clock source constraints:
* The input frequency range of the PLL is 10Mhz to 40MHz.
* If CLKIN is >40MHz, the input divider must be used.
*/
static unsigned long si5351_clkin_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct si5351_driver_data *drvdata =
container_of(hw, struct si5351_driver_data, clkin);
unsigned long rate;
unsigned char idiv;
rate = parent_rate;
if (parent_rate > 160000000) {
idiv = SI5351_CLKIN_DIV_8;
rate /= 8;
} else if (parent_rate > 80000000) {
idiv = SI5351_CLKIN_DIV_4;
rate /= 4;
} else if (parent_rate > 40000000) {
idiv = SI5351_CLKIN_DIV_2;
rate /= 2;
} else {
idiv = SI5351_CLKIN_DIV_1;
}
si5351_set_bits(drvdata, SI5351_PLL_INPUT_SOURCE,
SI5351_CLKIN_DIV_MASK, idiv);
dev_dbg(&drvdata->client->dev, "%s - clkin div = %d, rate = %lu\n",
__func__, (1 << (idiv >> 6)), rate);
return rate;
}
static const struct clk_ops si5351_clkin_ops = {
.prepare = si5351_clkin_prepare,
.unprepare = si5351_clkin_unprepare,
.recalc_rate = si5351_clkin_recalc_rate,
};
/*
* Si5351 vxco clock input (Si5351B only)
*/
static int si5351_vxco_prepare(struct clk_hw *hw)
{
struct si5351_hw_data *hwdata =
container_of(hw, struct si5351_hw_data, hw);
dev_warn(&hwdata->drvdata->client->dev, "VXCO currently unsupported\n");
return 0;
}
static void si5351_vxco_unprepare(struct clk_hw *hw)
{
}
static unsigned long si5351_vxco_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
return 0;
}
static int si5351_vxco_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent)
{
return 0;
}
static const struct clk_ops si5351_vxco_ops = {
.prepare = si5351_vxco_prepare,
.unprepare = si5351_vxco_unprepare,
.recalc_rate = si5351_vxco_recalc_rate,
.set_rate = si5351_vxco_set_rate,
};
/*
* Si5351 pll a/b
*
* Feedback Multisynth Divider Equations [2]
*
* fVCO = fIN * (a + b/c)
*
* with 15 + 0/1048575 <= (a + b/c) <= 90 + 0/1048575 and
* fIN = fXTAL or fIN = fCLKIN/CLKIN_DIV
*
* Feedback Multisynth Register Equations
*
* (1) MSNx_P1[17:0] = 128 * a + floor(128 * b/c) - 512
* (2) MSNx_P2[19:0] = 128 * b - c * floor(128 * b/c) = (128*b) mod c
* (3) MSNx_P3[19:0] = c
*
* Transposing (2) yields: (4) floor(128 * b/c) = (128 * b / MSNx_P2)/c
*
* Using (4) on (1) yields:
* MSNx_P1 = 128 * a + (128 * b/MSNx_P2)/c - 512
* MSNx_P1 + 512 + MSNx_P2/c = 128 * a + 128 * b/c
*
* a + b/c = (MSNx_P1 + MSNx_P2/MSNx_P3 + 512)/128
* = (MSNx_P1*MSNx_P3 + MSNx_P2 + 512*MSNx_P3)/(128*MSNx_P3)
*
*/
static int _si5351_pll_reparent(struct si5351_driver_data *drvdata,
int num, enum si5351_pll_src parent)
{
u8 mask = (num == 0) ? SI5351_PLLA_SOURCE : SI5351_PLLB_SOURCE;
if (parent == SI5351_PLL_SRC_DEFAULT)
return 0;
if (num > 2)
return -EINVAL;
if (drvdata->variant != SI5351_VARIANT_C &&
parent != SI5351_PLL_SRC_XTAL)
return -EINVAL;
si5351_set_bits(drvdata, SI5351_PLL_INPUT_SOURCE, mask,
(parent == SI5351_PLL_SRC_XTAL) ? 0 : mask);
return 0;
}
static unsigned char si5351_pll_get_parent(struct clk_hw *hw)
{
struct si5351_hw_data *hwdata =
container_of(hw, struct si5351_hw_data, hw);
u8 mask = (hwdata->num == 0) ? SI5351_PLLA_SOURCE : SI5351_PLLB_SOURCE;
u8 val;
val = si5351_reg_read(hwdata->drvdata, SI5351_PLL_INPUT_SOURCE);
return (val & mask) ? 1 : 0;
}
static int si5351_pll_set_parent(struct clk_hw *hw, u8 index)
{
struct si5351_hw_data *hwdata =
container_of(hw, struct si5351_hw_data, hw);
if (hwdata->drvdata->variant != SI5351_VARIANT_C &&
index > 0)
return -EPERM;
if (index > 1)
return -EINVAL;
return _si5351_pll_reparent(hwdata->drvdata, hwdata->num,
(index == 0) ? SI5351_PLL_SRC_XTAL :
SI5351_PLL_SRC_CLKIN);
}
static unsigned long si5351_pll_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct si5351_hw_data *hwdata =
container_of(hw, struct si5351_hw_data, hw);
u8 reg = (hwdata->num == 0) ? SI5351_PLLA_PARAMETERS :
SI5351_PLLB_PARAMETERS;
unsigned long long rate;
if (!hwdata->params.valid)
si5351_read_parameters(hwdata->drvdata, reg, &hwdata->params);
if (hwdata->params.p3 == 0)
return parent_rate;
/* fVCO = fIN * (P1*P3 + 512*P3 + P2)/(128*P3) */
rate = hwdata->params.p1 * hwdata->params.p3;
rate += 512 * hwdata->params.p3;
rate += hwdata->params.p2;
rate *= parent_rate;
do_div(rate, 128 * hwdata->params.p3);
dev_dbg(&hwdata->drvdata->client->dev,
"%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, parent_rate = %lu, rate = %lu\n",
__func__, clk_hw_get_name(hw),
hwdata->params.p1, hwdata->params.p2, hwdata->params.p3,
parent_rate, (unsigned long)rate);
return (unsigned long)rate;
}
static long si5351_pll_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *parent_rate)
{
struct si5351_hw_data *hwdata =
container_of(hw, struct si5351_hw_data, hw);
unsigned long rfrac, denom, a, b, c;
unsigned long long lltmp;
if (rate < SI5351_PLL_VCO_MIN)
rate = SI5351_PLL_VCO_MIN;
if (rate > SI5351_PLL_VCO_MAX)
rate = SI5351_PLL_VCO_MAX;
/* determine integer part of feedback equation */
a = rate / *parent_rate;
if (a < SI5351_PLL_A_MIN)
rate = *parent_rate * SI5351_PLL_A_MIN;
if (a > SI5351_PLL_A_MAX)
rate = *parent_rate * SI5351_PLL_A_MAX;
/* find best approximation for b/c = fVCO mod fIN */
denom = 1000 * 1000;
lltmp = rate % (*parent_rate);
lltmp *= denom;
do_div(lltmp, *parent_rate);
rfrac = (unsigned long)lltmp;
b = 0;
c = 1;
if (rfrac)
rational_best_approximation(rfrac, denom,
SI5351_PLL_B_MAX, SI5351_PLL_C_MAX, &b, &c);
/* calculate parameters */
hwdata->params.p3 = c;
hwdata->params.p2 = (128 * b) % c;
hwdata->params.p1 = 128 * a;
hwdata->params.p1 += (128 * b / c);
hwdata->params.p1 -= 512;
/* recalculate rate by fIN * (a + b/c) */
lltmp = *parent_rate;
lltmp *= b;
do_div(lltmp, c);
rate = (unsigned long)lltmp;
rate += *parent_rate * a;
dev_dbg(&hwdata->drvdata->client->dev,
"%s - %s: a = %lu, b = %lu, c = %lu, parent_rate = %lu, rate = %lu\n",
__func__, clk_hw_get_name(hw), a, b, c,
*parent_rate, rate);
return rate;
}
static int si5351_pll_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct si5351_hw_data *hwdata =
container_of(hw, struct si5351_hw_data, hw);
u8 reg = (hwdata->num == 0) ? SI5351_PLLA_PARAMETERS :
SI5351_PLLB_PARAMETERS;
/* write multisynth parameters */
si5351_write_parameters(hwdata->drvdata, reg, &hwdata->params);
/* plla/pllb ctrl is in clk6/clk7 ctrl registers */
si5351_set_bits(hwdata->drvdata, SI5351_CLK6_CTRL + hwdata->num,
SI5351_CLK_INTEGER_MODE,
(hwdata->params.p2 == 0) ? SI5351_CLK_INTEGER_MODE : 0);
/* Do a pll soft reset on the affected pll */
si5351_reg_write(hwdata->drvdata, SI5351_PLL_RESET,
hwdata->num == 0 ? SI5351_PLL_RESET_A :
SI5351_PLL_RESET_B);
dev_dbg(&hwdata->drvdata->client->dev,
"%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, parent_rate = %lu, rate = %lu\n",
__func__, clk_hw_get_name(hw),
hwdata->params.p1, hwdata->params.p2, hwdata->params.p3,
parent_rate, rate);
return 0;
}
static const struct clk_ops si5351_pll_ops = {
.set_parent = si5351_pll_set_parent,
.get_parent = si5351_pll_get_parent,
.recalc_rate = si5351_pll_recalc_rate,
.round_rate = si5351_pll_round_rate,
.set_rate = si5351_pll_set_rate,
};
/*
* Si5351 multisync divider
*
* for fOUT <= 150 MHz:
*
* fOUT = (fIN * (a + b/c)) / CLKOUTDIV
*
* with 6 + 0/1048575 <= (a + b/c) <= 1800 + 0/1048575 and
* fIN = fVCO0, fVCO1
*
* Output Clock Multisynth Register Equations
*
* MSx_P1[17:0] = 128 * a + floor(128 * b/c) - 512
* MSx_P2[19:0] = 128 * b - c * floor(128 * b/c) = (128*b) mod c
* MSx_P3[19:0] = c
*
* MS[6,7] are integer (P1) divide only, P1 = divide value,
* P2 and P3 are not applicable
*
* for 150MHz < fOUT <= 160MHz:
*
* MSx_P1 = 0, MSx_P2 = 0, MSx_P3 = 1, MSx_INT = 1, MSx_DIVBY4 = 11b
*/
static int _si5351_msynth_reparent(struct si5351_driver_data *drvdata,
int num, enum si5351_multisynth_src parent)
{
if (parent == SI5351_MULTISYNTH_SRC_DEFAULT)
return 0;
if (num > 8)
return -EINVAL;
si5351_set_bits(drvdata, SI5351_CLK0_CTRL + num, SI5351_CLK_PLL_SELECT,
(parent == SI5351_MULTISYNTH_SRC_VCO0) ? 0 :
SI5351_CLK_PLL_SELECT);
return 0;
}
static unsigned char si5351_msynth_get_parent(struct clk_hw *hw)
{
struct si5351_hw_data *hwdata =
container_of(hw, struct si5351_hw_data, hw);
u8 val;
val = si5351_reg_read(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num);
return (val & SI5351_CLK_PLL_SELECT) ? 1 : 0;
}
static int si5351_msynth_set_parent(struct clk_hw *hw, u8 index)
{
struct si5351_hw_data *hwdata =
container_of(hw, struct si5351_hw_data, hw);
return _si5351_msynth_reparent(hwdata->drvdata, hwdata->num,
(index == 0) ? SI5351_MULTISYNTH_SRC_VCO0 :
SI5351_MULTISYNTH_SRC_VCO1);
}
static unsigned long si5351_msynth_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct si5351_hw_data *hwdata =
container_of(hw, struct si5351_hw_data, hw);
u8 reg = si5351_msynth_params_address(hwdata->num);
unsigned long long rate;
unsigned long m;
if (!hwdata->params.valid)
si5351_read_parameters(hwdata->drvdata, reg, &hwdata->params);
/*
* multisync0-5: fOUT = (128 * P3 * fIN) / (P1*P3 + P2 + 512*P3)
* multisync6-7: fOUT = fIN / P1
*/
rate = parent_rate;
if (hwdata->num > 5) {
m = hwdata->params.p1;
} else if (hwdata->params.p3 == 0) {
return parent_rate;
} else if ((si5351_reg_read(hwdata->drvdata, reg + 2) &
SI5351_OUTPUT_CLK_DIVBY4) == SI5351_OUTPUT_CLK_DIVBY4) {
m = 4;
} else {
rate *= 128 * hwdata->params.p3;
m = hwdata->params.p1 * hwdata->params.p3;
m += hwdata->params.p2;
m += 512 * hwdata->params.p3;
}
if (m == 0)
return 0;
do_div(rate, m);
dev_dbg(&hwdata->drvdata->client->dev,
"%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, m = %lu, parent_rate = %lu, rate = %lu\n",
__func__, clk_hw_get_name(hw),
hwdata->params.p1, hwdata->params.p2, hwdata->params.p3,
m, parent_rate, (unsigned long)rate);
return (unsigned long)rate;
}
static long si5351_msynth_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *parent_rate)
{
struct si5351_hw_data *hwdata =
container_of(hw, struct si5351_hw_data, hw);
unsigned long long lltmp;
unsigned long a, b, c;
int divby4;
/* multisync6-7 can only handle freqencies < 150MHz */
if (hwdata->num >= 6 && rate > SI5351_MULTISYNTH67_MAX_FREQ)
rate = SI5351_MULTISYNTH67_MAX_FREQ;
/* multisync frequency is 1MHz .. 160MHz */
if (rate > SI5351_MULTISYNTH_MAX_FREQ)
rate = SI5351_MULTISYNTH_MAX_FREQ;
if (rate < SI5351_MULTISYNTH_MIN_FREQ)
rate = SI5351_MULTISYNTH_MIN_FREQ;
divby4 = 0;
if (rate > SI5351_MULTISYNTH_DIVBY4_FREQ)
divby4 = 1;
/* multisync can set pll */
if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
/*
* find largest integer divider for max
* vco frequency and given target rate
*/
if (divby4 == 0) {
lltmp = SI5351_PLL_VCO_MAX;
do_div(lltmp, rate);
a = (unsigned long)lltmp;
} else
a = 4;
b = 0;
c = 1;
*parent_rate = a * rate;
} else if (hwdata->num >= 6) {
/* determine the closest integer divider */
a = DIV_ROUND_CLOSEST(*parent_rate, rate);
if (a < SI5351_MULTISYNTH_A_MIN)
a = SI5351_MULTISYNTH_A_MIN;
if (a > SI5351_MULTISYNTH67_A_MAX)
a = SI5351_MULTISYNTH67_A_MAX;
b = 0;
c = 1;
} else {
unsigned long rfrac, denom;
/* disable divby4 */
if (divby4) {
rate = SI5351_MULTISYNTH_DIVBY4_FREQ;
divby4 = 0;
}
/* determine integer part of divider equation */
a = *parent_rate / rate;
if (a < SI5351_MULTISYNTH_A_MIN)
a = SI5351_MULTISYNTH_A_MIN;
if (a > SI5351_MULTISYNTH_A_MAX)
a = SI5351_MULTISYNTH_A_MAX;
/* find best approximation for b/c = fVCO mod fOUT */
denom = 1000 * 1000;
lltmp = (*parent_rate) % rate;
lltmp *= denom;
do_div(lltmp, rate);
rfrac = (unsigned long)lltmp;
b = 0;
c = 1;
if (rfrac)
rational_best_approximation(rfrac, denom,
SI5351_MULTISYNTH_B_MAX, SI5351_MULTISYNTH_C_MAX,
&b, &c);
}
/* recalculate rate by fOUT = fIN / (a + b/c) */
lltmp = *parent_rate;
lltmp *= c;
do_div(lltmp, a * c + b);
rate = (unsigned long)lltmp;
/* calculate parameters */
if (divby4) {
hwdata->params.p3 = 1;
hwdata->params.p2 = 0;
hwdata->params.p1 = 0;
} else if (hwdata->num >= 6) {
hwdata->params.p3 = 0;
hwdata->params.p2 = 0;
hwdata->params.p1 = a;
} else {
hwdata->params.p3 = c;
hwdata->params.p2 = (128 * b) % c;
hwdata->params.p1 = 128 * a;
hwdata->params.p1 += (128 * b / c);
hwdata->params.p1 -= 512;
}
dev_dbg(&hwdata->drvdata->client->dev,
"%s - %s: a = %lu, b = %lu, c = %lu, divby4 = %d, parent_rate = %lu, rate = %lu\n",
__func__, clk_hw_get_name(hw), a, b, c, divby4,
*parent_rate, rate);
return rate;
}
static int si5351_msynth_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct si5351_hw_data *hwdata =
container_of(hw, struct si5351_hw_data, hw);
u8 reg = si5351_msynth_params_address(hwdata->num);
int divby4 = 0;
/* write multisynth parameters */
si5351_write_parameters(hwdata->drvdata, reg, &hwdata->params);
if (rate > SI5351_MULTISYNTH_DIVBY4_FREQ)
divby4 = 1;
/* enable/disable integer mode and divby4 on multisynth0-5 */
if (hwdata->num < 6) {
si5351_set_bits(hwdata->drvdata, reg + 2,
SI5351_OUTPUT_CLK_DIVBY4,
(divby4) ? SI5351_OUTPUT_CLK_DIVBY4 : 0);
si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num,
SI5351_CLK_INTEGER_MODE,
(hwdata->params.p2 == 0) ? SI5351_CLK_INTEGER_MODE : 0);
}
dev_dbg(&hwdata->drvdata->client->dev,
"%s - %s: p1 = %lu, p2 = %lu, p3 = %lu, divby4 = %d, parent_rate = %lu, rate = %lu\n",
__func__, clk_hw_get_name(hw),
hwdata->params.p1, hwdata->params.p2, hwdata->params.p3,
divby4, parent_rate, rate);
return 0;
}
static const struct clk_ops si5351_msynth_ops = {
.set_parent = si5351_msynth_set_parent,
.get_parent = si5351_msynth_get_parent,
.recalc_rate = si5351_msynth_recalc_rate,
.round_rate = si5351_msynth_round_rate,
.set_rate = si5351_msynth_set_rate,
};
/*
* Si5351 clkout divider
*/
static int _si5351_clkout_reparent(struct si5351_driver_data *drvdata,
int num, enum si5351_clkout_src parent)
{
u8 val;
if (num > 8)
return -EINVAL;
switch (parent) {
case SI5351_CLKOUT_SRC_MSYNTH_N:
val = SI5351_CLK_INPUT_MULTISYNTH_N;
break;
case SI5351_CLKOUT_SRC_MSYNTH_0_4:
/* clk0/clk4 can only connect to its own multisync */
if (num == 0 || num == 4)
val = SI5351_CLK_INPUT_MULTISYNTH_N;
else
val = SI5351_CLK_INPUT_MULTISYNTH_0_4;
break;
case SI5351_CLKOUT_SRC_XTAL:
val = SI5351_CLK_INPUT_XTAL;
break;
case SI5351_CLKOUT_SRC_CLKIN:
if (drvdata->variant != SI5351_VARIANT_C)
return -EINVAL;
val = SI5351_CLK_INPUT_CLKIN;
break;
default:
return 0;
}
si5351_set_bits(drvdata, SI5351_CLK0_CTRL + num,
SI5351_CLK_INPUT_MASK, val);
return 0;
}
static int _si5351_clkout_set_drive_strength(
struct si5351_driver_data *drvdata, int num,
enum si5351_drive_strength drive)
{
u8 mask;
if (num > 8)
return -EINVAL;
switch (drive) {
case SI5351_DRIVE_2MA:
mask = SI5351_CLK_DRIVE_STRENGTH_2MA;
break;
case SI5351_DRIVE_4MA:
mask = SI5351_CLK_DRIVE_STRENGTH_4MA;
break;
case SI5351_DRIVE_6MA:
mask = SI5351_CLK_DRIVE_STRENGTH_6MA;
break;
case SI5351_DRIVE_8MA:
mask = SI5351_CLK_DRIVE_STRENGTH_8MA;
break;
default:
return 0;
}
si5351_set_bits(drvdata, SI5351_CLK0_CTRL + num,
SI5351_CLK_DRIVE_STRENGTH_MASK, mask);
return 0;
}
static int _si5351_clkout_set_disable_state(
struct si5351_driver_data *drvdata, int num,
enum si5351_disable_state state)
{
u8 reg = (num < 4) ? SI5351_CLK3_0_DISABLE_STATE :
SI5351_CLK7_4_DISABLE_STATE;
u8 shift = (num < 4) ? (2 * num) : (2 * (num-4));
u8 mask = SI5351_CLK_DISABLE_STATE_MASK << shift;
u8 val;
if (num > 8)
return -EINVAL;
switch (state) {
case SI5351_DISABLE_LOW:
val = SI5351_CLK_DISABLE_STATE_LOW;
break;
case SI5351_DISABLE_HIGH:
val = SI5351_CLK_DISABLE_STATE_HIGH;
break;
case SI5351_DISABLE_FLOATING:
val = SI5351_CLK_DISABLE_STATE_FLOAT;
break;
case SI5351_DISABLE_NEVER:
val = SI5351_CLK_DISABLE_STATE_NEVER;
break;
default:
return 0;
}
si5351_set_bits(drvdata, reg, mask, val << shift);
return 0;
}
static int si5351_clkout_prepare(struct clk_hw *hw)
{
struct si5351_hw_data *hwdata =
container_of(hw, struct si5351_hw_data, hw);
si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num,
SI5351_CLK_POWERDOWN, 0);
si5351_set_bits(hwdata->drvdata, SI5351_OUTPUT_ENABLE_CTRL,
(1 << hwdata->num), 0);
return 0;
}
static void si5351_clkout_unprepare(struct clk_hw *hw)
{
struct si5351_hw_data *hwdata =
container_of(hw, struct si5351_hw_data, hw);
si5351_set_bits(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num,
SI5351_CLK_POWERDOWN, SI5351_CLK_POWERDOWN);
si5351_set_bits(hwdata->drvdata, SI5351_OUTPUT_ENABLE_CTRL,
(1 << hwdata->num), (1 << hwdata->num));
}
static u8 si5351_clkout_get_parent(struct clk_hw *hw)
{
struct si5351_hw_data *hwdata =
container_of(hw, struct si5351_hw_data, hw);
int index = 0;
unsigned char val;
val = si5351_reg_read(hwdata->drvdata, SI5351_CLK0_CTRL + hwdata->num);
switch (val & SI5351_CLK_INPUT_MASK) {
case SI5351_CLK_INPUT_MULTISYNTH_N:
index = 0;
break;
case SI5351_CLK_INPUT_MULTISYNTH_0_4:
index = 1;
break;
case SI5351_CLK_INPUT_XTAL:
index = 2;
break;
case SI5351_CLK_INPUT_CLKIN:
index = 3;
break;
}
return index;
}
static int si5351_clkout_set_parent(struct clk_hw *hw, u8 index)
{
struct si5351_hw_data *hwdata =
container_of(hw, struct si5351_hw_data, hw);
enum si5351_clkout_src parent = SI5351_CLKOUT_SRC_DEFAULT;
switch (index) {
case 0:
parent = SI5351_CLKOUT_SRC_MSYNTH_N;
break;
case 1:
parent = SI5351_CLKOUT_SRC_MSYNTH_0_4;
break;
case 2:
parent = SI5351_CLKOUT_SRC_XTAL;
break;
case 3:
parent = SI5351_CLKOUT_SRC_CLKIN;
break;
}
return _si5351_clkout_reparent(hwdata->drvdata, hwdata->num, parent);
}
static unsigned long si5351_clkout_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct si5351_hw_data *hwdata =
container_of(hw, struct si5351_hw_data, hw);
unsigned char reg;
unsigned char rdiv;
if (hwdata->num <= 5)
reg = si5351_msynth_params_address(hwdata->num) + 2;
else
reg = SI5351_CLK6_7_OUTPUT_DIVIDER;
rdiv = si5351_reg_read(hwdata->drvdata, reg);
if (hwdata->num == 6) {
rdiv &= SI5351_OUTPUT_CLK6_DIV_MASK;
} else {
rdiv &= SI5351_OUTPUT_CLK_DIV_MASK;
rdiv >>= SI5351_OUTPUT_CLK_DIV_SHIFT;
}
return parent_rate >> rdiv;