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/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
  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         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);