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Linux/arch/mips/lantiq/xway/vmmc.c

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  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);
 69 

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