mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-06 03:06:16 +09:00
83d290c56f
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>
145 lines
3.4 KiB
C
145 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2015 Samsung Electronics
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* Przemyslaw Marczak <p.marczak@samsung.com>
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*/
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#include <common.h>
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#include <errno.h>
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#include <dm.h>
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#include <adc.h>
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#include <asm/arch/adc.h>
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struct exynos_adc_priv {
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int active_channel;
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struct exynos_adc_v2 *regs;
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};
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int exynos_adc_channel_data(struct udevice *dev, int channel,
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unsigned int *data)
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{
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struct exynos_adc_priv *priv = dev_get_priv(dev);
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struct exynos_adc_v2 *regs = priv->regs;
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if (channel != priv->active_channel) {
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pr_err("Requested channel is not active!");
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return -EINVAL;
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}
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if (ADC_V2_GET_STATUS_FLAG(readl(®s->status)) != FLAG_CONV_END)
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return -EBUSY;
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*data = readl(®s->dat) & ADC_V2_DAT_MASK;
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return 0;
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}
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int exynos_adc_start_channel(struct udevice *dev, int channel)
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{
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struct exynos_adc_priv *priv = dev_get_priv(dev);
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struct exynos_adc_v2 *regs = priv->regs;
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unsigned int cfg;
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/* Choose channel */
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cfg = readl(®s->con2);
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cfg &= ~ADC_V2_CON2_CHAN_SEL_MASK;
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cfg |= ADC_V2_CON2_CHAN_SEL(channel);
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writel(cfg, ®s->con2);
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/* Start conversion */
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cfg = readl(®s->con1);
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writel(cfg | ADC_V2_CON1_STC_EN, ®s->con1);
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priv->active_channel = channel;
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return 0;
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}
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int exynos_adc_stop(struct udevice *dev)
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{
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struct exynos_adc_priv *priv = dev_get_priv(dev);
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struct exynos_adc_v2 *regs = priv->regs;
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unsigned int cfg;
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/* Stop conversion */
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cfg = readl(®s->con1);
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cfg |= ~ADC_V2_CON1_STC_EN;
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writel(cfg, ®s->con1);
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priv->active_channel = -1;
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return 0;
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}
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int exynos_adc_probe(struct udevice *dev)
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{
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struct exynos_adc_priv *priv = dev_get_priv(dev);
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struct exynos_adc_v2 *regs = priv->regs;
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unsigned int cfg;
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/* Check HW version */
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if (readl(®s->version) != ADC_V2_VERSION) {
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pr_err("This driver supports only ADC v2!");
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return -ENXIO;
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}
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/* ADC Reset */
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writel(ADC_V2_CON1_SOFT_RESET, ®s->con1);
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/* Disable INT - will read status only */
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writel(0x0, ®s->int_en);
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/* CON2 - set conversion parameters */
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cfg = ADC_V2_CON2_C_TIME(3); /* Conversion times: (1 << 3) = 8 */
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cfg |= ADC_V2_CON2_OSEL(OSEL_BINARY);
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cfg |= ADC_V2_CON2_ESEL(ESEL_ADC_EVAL_TIME_20CLK);
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cfg |= ADC_V2_CON2_HIGHF(HIGHF_CONV_RATE_600KSPS);
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writel(cfg, ®s->con2);
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priv->active_channel = -1;
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return 0;
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}
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int exynos_adc_ofdata_to_platdata(struct udevice *dev)
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{
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struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
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struct exynos_adc_priv *priv = dev_get_priv(dev);
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priv->regs = (struct exynos_adc_v2 *)devfdt_get_addr(dev);
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if (priv->regs == (struct exynos_adc_v2 *)FDT_ADDR_T_NONE) {
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pr_err("Dev: %s - can't get address!", dev->name);
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return -ENODATA;
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}
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uc_pdata->data_mask = ADC_V2_DAT_MASK;
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uc_pdata->data_format = ADC_DATA_FORMAT_BIN;
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uc_pdata->data_timeout_us = ADC_V2_CONV_TIMEOUT_US;
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/* Mask available channel bits: [0:9] */
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uc_pdata->channel_mask = (2 << ADC_V2_MAX_CHANNEL) - 1;
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return 0;
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}
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static const struct adc_ops exynos_adc_ops = {
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.start_channel = exynos_adc_start_channel,
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.channel_data = exynos_adc_channel_data,
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.stop = exynos_adc_stop,
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};
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static const struct udevice_id exynos_adc_ids[] = {
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{ .compatible = "samsung,exynos-adc-v2" },
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{ }
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};
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U_BOOT_DRIVER(exynos_adc) = {
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.name = "exynos-adc",
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.id = UCLASS_ADC,
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.of_match = exynos_adc_ids,
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.ops = &exynos_adc_ops,
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.probe = exynos_adc_probe,
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.ofdata_to_platdata = exynos_adc_ofdata_to_platdata,
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.priv_auto_alloc_size = sizeof(struct exynos_adc_priv),
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};
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