arch/mips/lantiq/xway/vmmc.c

   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
  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
  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);