arch/mips/lantiq/xway/vmmc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *
   4  *  Copyright (C) 2012 John Crispin <[email protected]>
   5  */
   6
   7 #include <linux/export.h>
   8 #include <linux/of_platform.h>
   9 #include <linux/of_gpio.h>
  10 #include <linux/dma-mapping.h>
  11
  12 #include <lantiq_soc.h>
  13
  14 static unsigned int *cp1_base;
  15
  16 unsigned int *ltq_get_cp1_base(void)
  17 {
  18         if (!cp1_base)
  19                 panic("no cp1 base was set\n");
  20
  21         return cp1_base;
  22 }
  23 EXPORT_SYMBOL(ltq_get_cp1_base);
  24
  25 static int vmmc_probe(struct platform_device *pdev)
  26 {
  27 #define CP1_SIZE       (1 << 20)
  28         int gpio_count;
  29         dma_addr_t dma;
  30
  31         cp1_base =
  32                 (void *) CPHYSADDR(dma_alloc_coherent(&pdev->dev, CP1_SIZE,
  33                                                     &dma, GFP_KERNEL));
  34
  35         gpio_count = of_gpio_count(pdev->dev.of_node);
  36         while (gpio_count > 0) {
  37                 enum of_gpio_flags flags;
  38                 int gpio = of_get_gpio_flags(pdev->dev.of_node,
  39                                              --gpio_count, &flags);
  40                 if (gpio_request(gpio, "vmmc-relay"))
  41                         continue;
  42                 dev_info(&pdev->dev, "requested GPIO %d\n", gpio);
  43                 gpio_direction_output(gpio,
  44                                       (flags & OF_GPIO_ACTIVE_LOW) ? (0) : (1));
  45         }
  46
  47         dev_info(&pdev->dev, "reserved %dMB at 0x%p", CP1_SIZE >> 20, cp1_base);
  48
  49         return 0;
  50 }
  51
  52 static const struct of_device_id vmmc_match[] = {
  53         { .compatible = "lantiq,vmmc-xway" },
  54         {},
  55 };
  56
  57 static struct platform_driver vmmc_driver = {
  58         .probe = vmmc_probe,
  59         .driver = {
  60                 .name = "lantiq,vmmc",
  61                 .of_match_table = vmmc_match,
  62         },
  63 };
  64 builtin_platform_driver(vmmc_driver);