1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2017, Fuzhou Rockchip Electronics Co., Ltd
5 * Rockchip SARADC driver for U-Boot
14 #include <linux/bitops.h>
15 #include <linux/err.h>
16 #include <power/regulator.h>
18 #define SARADC_CTRL_CHN_MASK GENMASK(2, 0)
19 #define SARADC_CTRL_POWER_CTRL BIT(3)
20 #define SARADC_CTRL_IRQ_ENABLE BIT(5)
21 #define SARADC_CTRL_IRQ_STATUS BIT(6)
23 #define SARADC_TIMEOUT (100 * 1000)
25 struct rockchip_saradc_regs {
29 unsigned int dly_pu_soc;
32 struct rockchip_saradc_data {
35 unsigned long clk_rate;
38 struct rockchip_saradc_priv {
39 struct rockchip_saradc_regs *regs;
41 const struct rockchip_saradc_data *data;
44 int rockchip_saradc_channel_data(struct udevice *dev, int channel,
47 struct rockchip_saradc_priv *priv = dev_get_priv(dev);
48 struct adc_uclass_plat *uc_pdata = dev_get_uclass_plat(dev);
50 if (channel != priv->active_channel) {
51 pr_err("Requested channel is not active!");
55 if ((readl(&priv->regs->ctrl) & SARADC_CTRL_IRQ_STATUS) !=
56 SARADC_CTRL_IRQ_STATUS)
60 *data = readl(&priv->regs->data);
61 *data &= uc_pdata->data_mask;
64 writel(0, &priv->regs->ctrl);
69 int rockchip_saradc_start_channel(struct udevice *dev, int channel)
71 struct rockchip_saradc_priv *priv = dev_get_priv(dev);
73 if (channel < 0 || channel >= priv->data->num_channels) {
74 pr_err("Requested channel is invalid!");
78 /* 8 clock periods as delay between power up and start cmd */
79 writel(8, &priv->regs->dly_pu_soc);
81 /* Select the channel to be used and trigger conversion */
82 writel(SARADC_CTRL_POWER_CTRL | (channel & SARADC_CTRL_CHN_MASK) |
83 SARADC_CTRL_IRQ_ENABLE, &priv->regs->ctrl);
85 priv->active_channel = channel;
90 int rockchip_saradc_stop(struct udevice *dev)
92 struct rockchip_saradc_priv *priv = dev_get_priv(dev);
95 writel(0, &priv->regs->ctrl);
97 priv->active_channel = -1;
102 int rockchip_saradc_probe(struct udevice *dev)
104 struct adc_uclass_plat *uc_pdata = dev_get_uclass_plat(dev);
105 struct rockchip_saradc_priv *priv = dev_get_priv(dev);
106 struct udevice *vref;
111 ret = clk_get_by_index(dev, 0, &clk);
115 ret = clk_set_rate(&clk, priv->data->clk_rate);
116 if (IS_ERR_VALUE(ret))
119 priv->active_channel = -1;
121 ret = device_get_supply_regulator(dev, "vref-supply", &vref);
123 printf("can't get vref-supply: %d\n", ret);
127 vref_uv = regulator_get_value(vref);
129 printf("can't get vref-supply value: %d\n", vref_uv);
133 /* VDD supplied by common vref pin */
134 uc_pdata->vdd_supply = vref;
135 uc_pdata->vdd_microvolts = vref_uv;
136 uc_pdata->vss_microvolts = 0;
141 int rockchip_saradc_of_to_plat(struct udevice *dev)
143 struct adc_uclass_plat *uc_pdata = dev_get_uclass_plat(dev);
144 struct rockchip_saradc_priv *priv = dev_get_priv(dev);
145 struct rockchip_saradc_data *data;
147 data = (struct rockchip_saradc_data *)dev_get_driver_data(dev);
148 priv->regs = (struct rockchip_saradc_regs *)dev_read_addr(dev);
149 if (priv->regs == (struct rockchip_saradc_regs *)FDT_ADDR_T_NONE) {
150 pr_err("Dev: %s - can't get address!", dev->name);
155 uc_pdata->data_mask = (1 << priv->data->num_bits) - 1;
156 uc_pdata->data_format = ADC_DATA_FORMAT_BIN;
157 uc_pdata->data_timeout_us = SARADC_TIMEOUT / 5;
158 uc_pdata->channel_mask = (1 << priv->data->num_channels) - 1;
163 static const struct adc_ops rockchip_saradc_ops = {
164 .start_channel = rockchip_saradc_start_channel,
165 .channel_data = rockchip_saradc_channel_data,
166 .stop = rockchip_saradc_stop,
169 static const struct rockchip_saradc_data saradc_data = {
175 static const struct rockchip_saradc_data rk3066_tsadc_data = {
181 static const struct rockchip_saradc_data rk3399_saradc_data = {
187 static const struct udevice_id rockchip_saradc_ids[] = {
188 { .compatible = "rockchip,saradc",
189 .data = (ulong)&saradc_data },
190 { .compatible = "rockchip,rk3066-tsadc",
191 .data = (ulong)&rk3066_tsadc_data },
192 { .compatible = "rockchip,rk3399-saradc",
193 .data = (ulong)&rk3399_saradc_data },
197 U_BOOT_DRIVER(rockchip_saradc) = {
198 .name = "rockchip_saradc",
200 .of_match = rockchip_saradc_ids,
201 .ops = &rockchip_saradc_ops,
202 .probe = rockchip_saradc_probe,
203 .of_to_plat = rockchip_saradc_of_to_plat,
204 .priv_auto = sizeof(struct rockchip_saradc_priv),