xref: /openbmc/linux/arch/mips/lantiq/xway/vmmc.c (revision 657c45b3)
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 
16 static unsigned int *cp1_base;
17 
ltq_get_cp1_base(void)18 unsigned 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 }
25 EXPORT_SYMBOL(ltq_get_cp1_base);
26 
vmmc_probe(struct platform_device * pdev)27 static 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 
59 static const struct of_device_id vmmc_match[] = {
60 	{ .compatible = "lantiq,vmmc-xway" },
61 	{},
62 };
63 
64 static struct platform_driver vmmc_driver = {
65 	.probe = vmmc_probe,
66 	.driver = {
67 		.name = "lantiq,vmmc",
68 		.of_match_table = vmmc_match,
69 	},
70 };
71 builtin_platform_driver(vmmc_driver);
72