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