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// SPDX-License-Identifier: GPL-2.0+
/*
* Texas Instruments CDCE913/925/937/949 clock synthesizer driver
*
* Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/
* Tero Kristo <t-kristo@ti.com>
*
* Based on Linux kernel clk-cdce925.c.
*/
#include <dm.h>
#include <errno.h>
#include <clk-uclass.h>
#include <i2c.h>
#include <dm/device_compat.h>
#include <linux/bitops.h>
#define MAX_NUMBER_OF_PLLS 4
#define MAX_NUMER_OF_OUTPUTS 9
#define CDCE9XX_REG_GLOBAL1 0x01
#define CDCE9XX_REG_Y1SPIPDIVH 0x02
#define CDCE9XX_REG_PDIV1L 0x03
#define CDCE9XX_REG_XCSEL 0x05
#define CDCE9XX_PDIV1_H_MASK 0x3
#define CDCE9XX_REG_PDIV(clk) (0x16 + (((clk) - 1) & 1) + \
((clk) - 1) / 2 * 0x10)
#define CDCE9XX_PDIV_MASK 0x7f
#define CDCE9XX_BYTE_TRANSFER BIT(7)
struct cdce9xx_chip_info {
int num_plls;
int num_outputs;
};
struct cdce9xx_clk_data {
struct udevice *i2c;
struct cdce9xx_chip_info *chip;
u32 xtal_rate;
};
static const struct cdce9xx_chip_info cdce913_chip_info = {
.num_plls = 1, .num_outputs = 3,
};
static const struct cdce9xx_chip_info cdce925_chip_info = {
.num_plls = 2, .num_outputs = 5,
};
static const struct cdce9xx_chip_info cdce937_chip_info = {
.num_plls = 3, .num_outputs = 7,
};
static const struct cdce9xx_chip_info cdce949_chip_info = {
.num_plls = 4, .num_outputs = 9,
};
static int cdce9xx_reg_read(struct udevice *dev, u8 addr, u8 *buf)
{
struct cdce9xx_clk_data *data = dev_get_priv(dev);
int ret;
ret = dm_i2c_read(data->i2c, addr | CDCE9XX_BYTE_TRANSFER, buf, 1);
if (ret)
dev_err(dev, "%s: failed for addr:%x, ret:%d\n", __func__,
addr, ret);
return ret;
}
static int cdce9xx_reg_write(struct udevice *dev, u8 addr, u8 val)
{
struct cdce9xx_clk_data *data = dev_get_priv(dev);
int ret;
ret = dm_i2c_write(data->i2c, addr | CDCE9XX_BYTE_TRANSFER, &val, 1);
if (ret)
dev_err(dev, "%s: failed for addr:%x, ret:%d\n", __func__,
addr, ret);
return ret;
}
static int cdce9xx_clk_request(struct clk *clk)
{
struct cdce9xx_clk_data *data = dev_get_priv(clk->dev);
if (clk->id > data->chip->num_outputs)
return -EINVAL;
return 0;
}
static int cdce9xx_clk_probe(struct udevice *dev)
{
struct cdce9xx_clk_data *data = dev_get_priv(dev);
struct cdce9xx_chip_info *chip = (void *)dev_get_driver_data(dev);
int ret;
u32 val;
struct clk clk;
val = (u32)dev_read_addr_ptr(dev);
ret = i2c_get_chip(dev->parent, val, 1, &data->i2c);
if (ret) {
dev_err(dev, "I2C probe failed.\n");
return ret;
}
data->chip = chip;
ret = clk_get_by_index(dev, 0, &clk);
data->xtal_rate = clk_get_rate(&clk);
val = dev_read_u32_default(dev, "xtal-load-pf", -1);
if (val >= 0)
cdce9xx_reg_write(dev, CDCE9XX_REG_XCSEL, val << 3);
return 0;
}
static u16 cdce9xx_clk_get_pdiv(struct clk *clk)
{
u8 val;
u16 pdiv;
int ret;
if (clk->id == 0) {
ret = cdce9xx_reg_read(clk->dev, CDCE9XX_REG_Y1SPIPDIVH, &val);
if (ret)
return 0;
pdiv = (val & CDCE9XX_PDIV1_H_MASK) << 8;
ret = cdce9xx_reg_read(clk->dev, CDCE9XX_REG_PDIV1L, &val);
if (ret)
return 0;
pdiv |= val;
} else {
ret = cdce9xx_reg_read(clk->dev, CDCE9XX_REG_PDIV(clk->id),
&val);
if (ret)
return 0;
pdiv = val & CDCE9XX_PDIV_MASK;
}
return pdiv;
}
static u32 cdce9xx_clk_get_parent_rate(struct clk *clk)
{
struct cdce9xx_clk_data *data = dev_get_priv(clk->dev);
return data->xtal_rate;
}
static ulong cdce9xx_clk_get_rate(struct clk *clk)
{
u32 parent_rate;
u16 pdiv;
parent_rate = cdce9xx_clk_get_parent_rate(clk);
pdiv = cdce9xx_clk_get_pdiv(clk);
return parent_rate / pdiv;
}
static ulong cdce9xx_clk_set_rate(struct clk *clk, ulong rate)
{
u32 parent_rate;
int pdiv;
u32 diff;
u8 val;
int ret;
parent_rate = cdce9xx_clk_get_parent_rate(clk);
pdiv = parent_rate / rate;
diff = rate - parent_rate / pdiv;
if (rate - parent_rate / (pdiv + 1) < diff)
pdiv++;
if (clk->id == 0) {
ret = cdce9xx_reg_read(clk->dev, CDCE9XX_REG_Y1SPIPDIVH, &val);
if (ret)
return ret;
val &= ~CDCE9XX_PDIV1_H_MASK;
val |= (pdiv >> 8);
ret = cdce9xx_reg_write(clk->dev, CDCE9XX_REG_Y1SPIPDIVH, val);
if (ret)
return ret;
ret = cdce9xx_reg_write(clk->dev, CDCE9XX_REG_PDIV1L,
(pdiv & 0xff));
if (ret)
return ret;
} else {
ret = cdce9xx_reg_read(clk->dev, CDCE9XX_REG_PDIV(clk->id),
&val);
if (ret)
return ret;
val &= ~CDCE9XX_PDIV_MASK;
val |= pdiv;
ret = cdce9xx_reg_write(clk->dev, CDCE9XX_REG_PDIV(clk->id),
val);
if (ret)
return ret;
}
return 0;
}
static const struct udevice_id cdce9xx_clk_of_match[] = {
{ .compatible = "ti,cdce913", .data = (u32)&cdce913_chip_info },
{ .compatible = "ti,cdce925", .data = (u32)&cdce925_chip_info },
{ .compatible = "ti,cdce937", .data = (u32)&cdce937_chip_info },
{ .compatible = "ti,cdce949", .data = (u32)&cdce949_chip_info },
{ /* sentinel */ },
};
static const struct clk_ops cdce9xx_clk_ops = {
.request = cdce9xx_clk_request,
.get_rate = cdce9xx_clk_get_rate,
.set_rate = cdce9xx_clk_set_rate,
};
U_BOOT_DRIVER(cdce9xx_clk) = {
.name = "cdce9xx-clk",
.id = UCLASS_CLK,
.of_match = cdce9xx_clk_of_match,
.probe = cdce9xx_clk_probe,
.priv_auto = sizeof(struct cdce9xx_clk_data),
.ops = &cdce9xx_clk_ops,
};