fb: adv7393: off by one in probe function
[deliverable/linux.git] / arch / mips / lantiq / xway / vmmc.c
1 /*
2 * This program is free software; you can redistribute it and/or modify it
3 * under the terms of the GNU General Public License version 2 as published
4 * by the Free Software Foundation.
5 *
6 * Copyright (C) 2012 John Crispin <john@phrozen.org>
7 */
8
9 #include <linux/module.h>
10 #include <linux/of_platform.h>
11 #include <linux/of_gpio.h>
12 #include <linux/dma-mapping.h>
13
14 #include <lantiq_soc.h>
15
16 static unsigned int *cp1_base;
17
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
27 static int vmmc_probe(struct platform_device *pdev)
28 {
29 #define CP1_SIZE (1 << 20)
30 int gpio_count;
31 dma_addr_t dma;
32
33 cp1_base =
34 (void *) CPHYSADDR(dma_alloc_coherent(NULL, CP1_SIZE,
35 &dma, GFP_ATOMIC));
36
37 gpio_count = of_gpio_count(pdev->dev.of_node);
38 while (gpio_count > 0) {
39 enum of_gpio_flags flags;
40 int gpio = of_get_gpio_flags(pdev->dev.of_node,
41 --gpio_count, &flags);
42 if (gpio_request(gpio, "vmmc-relay"))
43 continue;
44 dev_info(&pdev->dev, "requested GPIO %d\n", gpio);
45 gpio_direction_output(gpio,
46 (flags & OF_GPIO_ACTIVE_LOW) ? (0) : (1));
47 }
48
49 dev_info(&pdev->dev, "reserved %dMB at 0x%p", CP1_SIZE >> 20, cp1_base);
50
51 return 0;
52 }
53
54 static const struct of_device_id vmmc_match[] = {
55 { .compatible = "lantiq,vmmc-xway" },
56 {},
57 };
58 MODULE_DEVICE_TABLE(of, vmmc_match);
59
60 static struct platform_driver vmmc_driver = {
61 .probe = vmmc_probe,
62 .driver = {
63 .name = "lantiq,vmmc",
64 .of_match_table = vmmc_match,
65 },
66 };
67
68 module_platform_driver(vmmc_driver);
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