vmmc.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 *
 4 *  Copyright (C) 2012 John Crispin <john@phrozen.org>
 5 */
 6
 7#include <linux/err.h>
 8#include <linux/export.h>
 9#include <linux/gpio/consumer.h>
10#include <linux/mod_devicetable.h>
11#include <linux/platform_device.h>
12#include <linux/dma-mapping.h>
13
14#include <lantiq_soc.h>
15
16static unsigned int *cp1_base;
17
18unsigned int *ltq_get_cp1_base(void)
19{
20	if (!cp1_base)
21		panic("no cp1 base was set\n");
22
23	return cp1_base;
24}
25EXPORT_SYMBOL(ltq_get_cp1_base);
26
27static int vmmc_probe(struct platform_device *pdev)
28{
29#define CP1_SIZE       (1 << 20)
30	struct gpio_desc *gpio;
31	int gpio_count;
32	dma_addr_t dma;
33	int error;
34
35	cp1_base =
36		(void *) CPHYSADDR(dma_alloc_coherent(&pdev->dev, CP1_SIZE,
37						    &dma, GFP_KERNEL));
38
39	gpio_count = gpiod_count(&pdev->dev, NULL);
40	while (gpio_count > 0) {
41		gpio = devm_gpiod_get_index(&pdev->dev,
42					    NULL, --gpio_count, GPIOD_OUT_HIGH);
43		error = PTR_ERR_OR_ZERO(gpio);
44		if (error) {
45			dev_err(&pdev->dev,
46				"failed to request GPIO idx %d: %d\n",
47				gpio_count, error);
48			continue;
49		}
50
51		gpiod_set_consumer_name(gpio, "vmmc-relay");
52	}
53
54	dev_info(&pdev->dev, "reserved %dMB at 0x%p", CP1_SIZE >> 20, cp1_base);
55
56	return 0;
57}
58
59static const struct of_device_id vmmc_match[] = {
60	{ .compatible = "lantiq,vmmc-xway" },
61	{},
62};
63
64static struct platform_driver vmmc_driver = {
65	.probe = vmmc_probe,
66	.driver = {
67		.name = "lantiq,vmmc",
68		.of_match_table = vmmc_match,
69	},
70};
71builtin_platform_driver(vmmc_driver);