rockchip-saradc.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2017, Fuzhou Rockchip Electronics Co., Ltd
*
* Rockchip SARADC driver for U-Boot
*/
#include <common.h>
#include <adc.h>
#include <clk.h>
#include <dm.h>
#include <errno.h>
#include <asm/io.h>
#define SARADC_CTRL_CHN_MASK GENMASK(2, 0)
#define SARADC_CTRL_POWER_CTRL BIT(3)
#define SARADC_CTRL_IRQ_ENABLE BIT(5)
#define SARADC_CTRL_IRQ_STATUS BIT(6)
#define SARADC_TIMEOUT (100 * 1000)
struct rockchip_saradc_regs {
unsigned int data;
unsigned int stas;
unsigned int ctrl;
unsigned int dly_pu_soc;
};
struct rockchip_saradc_data {
int num_bits;
int num_channels;
unsigned long clk_rate;
};
struct rockchip_saradc_priv {
struct rockchip_saradc_regs *regs;
int active_channel;
const struct rockchip_saradc_data *data;
};
int rockchip_saradc_channel_data(struct udevice *dev, int channel,
unsigned int *data)
{
struct rockchip_saradc_priv *priv = dev_get_priv(dev);
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
if (channel != priv->active_channel) {
pr_err("Requested channel is not active!");
return -EINVAL;
}
if ((readl(&priv->regs->ctrl) & SARADC_CTRL_IRQ_STATUS) !=
SARADC_CTRL_IRQ_STATUS)
return -EBUSY;
/* Read value */
*data = readl(&priv->regs->data);
*data &= uc_pdata->data_mask;
/* Power down adc */
writel(0, &priv->regs->ctrl);
return 0;
}
int rockchip_saradc_start_channel(struct udevice *dev, int channel)
{
struct rockchip_saradc_priv *priv = dev_get_priv(dev);
if (channel < 0 || channel >= priv->data->num_channels) {
pr_err("Requested channel is invalid!");
return -EINVAL;
}
/* 8 clock periods as delay between power up and start cmd */
writel(8, &priv->regs->dly_pu_soc);
/* Select the channel to be used and trigger conversion */
writel(SARADC_CTRL_POWER_CTRL | (channel & SARADC_CTRL_CHN_MASK) |
SARADC_CTRL_IRQ_ENABLE, &priv->regs->ctrl);
priv->active_channel = channel;
return 0;
}
int rockchip_saradc_stop(struct udevice *dev)
{
struct rockchip_saradc_priv *priv = dev_get_priv(dev);
/* Power down adc */
writel(0, &priv->regs->ctrl);
priv->active_channel = -1;
return 0;
}
int rockchip_saradc_probe(struct udevice *dev)
{
struct rockchip_saradc_priv *priv = dev_get_priv(dev);
struct clk clk;
int ret;
ret = clk_get_by_index(dev, 0, &clk);
if (ret)
return ret;
ret = clk_set_rate(&clk, priv->data->clk_rate);
if (IS_ERR_VALUE(ret))
return ret;
priv->active_channel = -1;
return 0;
}
int rockchip_saradc_ofdata_to_platdata(struct udevice *dev)
{
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
struct rockchip_saradc_priv *priv = dev_get_priv(dev);
struct rockchip_saradc_data *data;
data = (struct rockchip_saradc_data *)dev_get_driver_data(dev);
priv->regs = (struct rockchip_saradc_regs *)dev_read_addr(dev);
if (priv->regs == (struct rockchip_saradc_regs *)FDT_ADDR_T_NONE) {
pr_err("Dev: %s - can't get address!", dev->name);
return -ENODATA;
}
priv->data = data;
uc_pdata->data_mask = (1 << priv->data->num_bits) - 1;;
uc_pdata->data_format = ADC_DATA_FORMAT_BIN;
uc_pdata->data_timeout_us = SARADC_TIMEOUT / 5;
uc_pdata->channel_mask = (1 << priv->data->num_channels) - 1;
return 0;
}
static const struct adc_ops rockchip_saradc_ops = {
.start_channel = rockchip_saradc_start_channel,
.channel_data = rockchip_saradc_channel_data,
.stop = rockchip_saradc_stop,
};
static const struct rockchip_saradc_data saradc_data = {
.num_bits = 10,
.num_channels = 3,
.clk_rate = 1000000,
};
static const struct rockchip_saradc_data rk3066_tsadc_data = {
.num_bits = 12,
.num_channels = 2,
.clk_rate = 50000,
};
static const struct rockchip_saradc_data rk3399_saradc_data = {
.num_bits = 10,
.num_channels = 6,
.clk_rate = 1000000,
};
static const struct udevice_id rockchip_saradc_ids[] = {
{ .compatible = "rockchip,saradc",
.data = (ulong)&saradc_data },
{ .compatible = "rockchip,rk3066-tsadc",
.data = (ulong)&rk3066_tsadc_data },
{ .compatible = "rockchip,rk3399-saradc",
.data = (ulong)&rk3399_saradc_data },
{ }
};
U_BOOT_DRIVER(rockchip_saradc) = {
.name = "rockchip_saradc",
.id = UCLASS_ADC,
.of_match = rockchip_saradc_ids,
.ops = &rockchip_saradc_ops,
.probe = rockchip_saradc_probe,
.ofdata_to_platdata = rockchip_saradc_ofdata_to_platdata,
.priv_auto_alloc_size = sizeof(struct rockchip_saradc_priv),
};