u-boot/drivers/adc/rockchip-saradc.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

182 lines
4.3 KiB
C

// 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),
};