cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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sun4i-gpadc.c (4514B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/* ADC MFD core driver for sunxi platforms
      3 *
      4 * Copyright (c) 2016 Quentin Schulz <quentin.schulz@free-electrons.com>
      5 */
      6
      7#include <linux/interrupt.h>
      8#include <linux/kernel.h>
      9#include <linux/mfd/core.h>
     10#include <linux/module.h>
     11#include <linux/of_device.h>
     12#include <linux/of_irq.h>
     13#include <linux/regmap.h>
     14
     15#include <linux/mfd/sun4i-gpadc.h>
     16
     17#define ARCH_SUN4I_A10 0
     18#define ARCH_SUN5I_A13 1
     19#define ARCH_SUN6I_A31 2
     20
     21static const struct resource adc_resources[] = {
     22	DEFINE_RES_IRQ_NAMED(SUN4I_GPADC_IRQ_FIFO_DATA, "FIFO_DATA_PENDING"),
     23	DEFINE_RES_IRQ_NAMED(SUN4I_GPADC_IRQ_TEMP_DATA, "TEMP_DATA_PENDING"),
     24};
     25
     26static const struct regmap_irq sun4i_gpadc_regmap_irq[] = {
     27	REGMAP_IRQ_REG(SUN4I_GPADC_IRQ_FIFO_DATA, 0,
     28		       SUN4I_GPADC_INT_FIFOC_TP_DATA_IRQ_EN),
     29	REGMAP_IRQ_REG(SUN4I_GPADC_IRQ_TEMP_DATA, 0,
     30		       SUN4I_GPADC_INT_FIFOC_TEMP_IRQ_EN),
     31};
     32
     33static const struct regmap_irq_chip sun4i_gpadc_regmap_irq_chip = {
     34	.name = "sun4i_gpadc_irq_chip",
     35	.status_base = SUN4I_GPADC_INT_FIFOS,
     36	.ack_base = SUN4I_GPADC_INT_FIFOS,
     37	.mask_base = SUN4I_GPADC_INT_FIFOC,
     38	.init_ack_masked = true,
     39	.mask_invert = true,
     40	.irqs = sun4i_gpadc_regmap_irq,
     41	.num_irqs = ARRAY_SIZE(sun4i_gpadc_regmap_irq),
     42	.num_regs = 1,
     43};
     44
     45static struct mfd_cell sun4i_gpadc_cells[] = {
     46	{
     47		.name	= "sun4i-a10-gpadc-iio",
     48		.resources = adc_resources,
     49		.num_resources = ARRAY_SIZE(adc_resources),
     50	},
     51	{ .name = "iio_hwmon" }
     52};
     53
     54static struct mfd_cell sun5i_gpadc_cells[] = {
     55	{
     56		.name	= "sun5i-a13-gpadc-iio",
     57		.resources = adc_resources,
     58		.num_resources = ARRAY_SIZE(adc_resources),
     59	},
     60	{ .name = "iio_hwmon" },
     61};
     62
     63static struct mfd_cell sun6i_gpadc_cells[] = {
     64	{
     65		.name	= "sun6i-a31-gpadc-iio",
     66		.resources = adc_resources,
     67		.num_resources = ARRAY_SIZE(adc_resources),
     68	},
     69	{ .name = "iio_hwmon" },
     70};
     71
     72static const struct regmap_config sun4i_gpadc_regmap_config = {
     73	.reg_bits = 32,
     74	.val_bits = 32,
     75	.reg_stride = 4,
     76	.fast_io = true,
     77};
     78
     79static const struct of_device_id sun4i_gpadc_of_match[] = {
     80	{
     81		.compatible = "allwinner,sun4i-a10-ts",
     82		.data = (void *)ARCH_SUN4I_A10,
     83	}, {
     84		.compatible = "allwinner,sun5i-a13-ts",
     85		.data = (void *)ARCH_SUN5I_A13,
     86	}, {
     87		.compatible = "allwinner,sun6i-a31-ts",
     88		.data = (void *)ARCH_SUN6I_A31,
     89	}, { /* sentinel */ }
     90};
     91
     92MODULE_DEVICE_TABLE(of, sun4i_gpadc_of_match);
     93
     94static int sun4i_gpadc_probe(struct platform_device *pdev)
     95{
     96	struct sun4i_gpadc_dev *dev;
     97	struct resource *mem;
     98	const struct of_device_id *of_id;
     99	const struct mfd_cell *cells;
    100	unsigned int irq, size;
    101	int ret;
    102
    103	of_id = of_match_node(sun4i_gpadc_of_match, pdev->dev.of_node);
    104	if (!of_id)
    105		return -EINVAL;
    106
    107	switch ((long)of_id->data) {
    108	case ARCH_SUN4I_A10:
    109		cells = sun4i_gpadc_cells;
    110		size = ARRAY_SIZE(sun4i_gpadc_cells);
    111		break;
    112	case ARCH_SUN5I_A13:
    113		cells = sun5i_gpadc_cells;
    114		size = ARRAY_SIZE(sun5i_gpadc_cells);
    115		break;
    116	case ARCH_SUN6I_A31:
    117		cells = sun6i_gpadc_cells;
    118		size = ARRAY_SIZE(sun6i_gpadc_cells);
    119		break;
    120	default:
    121		return -EINVAL;
    122	}
    123
    124	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
    125	if (!dev)
    126		return -ENOMEM;
    127
    128	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    129	dev->base = devm_ioremap_resource(&pdev->dev, mem);
    130	if (IS_ERR(dev->base))
    131		return PTR_ERR(dev->base);
    132
    133	dev->dev = &pdev->dev;
    134	dev_set_drvdata(dev->dev, dev);
    135
    136	dev->regmap = devm_regmap_init_mmio(dev->dev, dev->base,
    137					    &sun4i_gpadc_regmap_config);
    138	if (IS_ERR(dev->regmap)) {
    139		ret = PTR_ERR(dev->regmap);
    140		dev_err(&pdev->dev, "failed to init regmap: %d\n", ret);
    141		return ret;
    142	}
    143
    144	/* Disable all interrupts */
    145	regmap_write(dev->regmap, SUN4I_GPADC_INT_FIFOC, 0);
    146
    147	irq = platform_get_irq(pdev, 0);
    148	ret = devm_regmap_add_irq_chip(&pdev->dev, dev->regmap, irq,
    149				       IRQF_ONESHOT, 0,
    150				       &sun4i_gpadc_regmap_irq_chip,
    151				       &dev->regmap_irqc);
    152	if (ret) {
    153		dev_err(&pdev->dev, "failed to add irq chip: %d\n", ret);
    154		return ret;
    155	}
    156
    157	ret = devm_mfd_add_devices(dev->dev, 0, cells, size, NULL, 0, NULL);
    158	if (ret) {
    159		dev_err(&pdev->dev, "failed to add MFD devices: %d\n", ret);
    160		return ret;
    161	}
    162
    163	return 0;
    164}
    165
    166static struct platform_driver sun4i_gpadc_driver = {
    167	.driver = {
    168		.name = "sun4i-gpadc",
    169		.of_match_table = sun4i_gpadc_of_match,
    170	},
    171	.probe = sun4i_gpadc_probe,
    172};
    173
    174module_platform_driver(sun4i_gpadc_driver);
    175
    176MODULE_DESCRIPTION("Allwinner sunxi platforms' GPADC MFD core driver");
    177MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
    178MODULE_LICENSE("GPL v2");