arch/m68k/virt/platform.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/platform_device.h>
   4 #include <linux/interrupt.h>
   5 #include <linux/memblock.h>
   6 #include <asm/virt.h>
   7 #include <asm/irq.h>
   8
   9 #define VIRTIO_BUS_NB   128
  10
  11 static struct platform_device * __init virt_virtio_init(unsigned int id)
  12 {
  13         const struct resource res[] = {
  14                 DEFINE_RES_MEM(virt_bi_data.virtio.mmio + id * 0x200, 0x200),
  15                 DEFINE_RES_IRQ(virt_bi_data.virtio.irq + id),
  16         };
  17
  18         return platform_device_register_simple("virtio-mmio", id,
  19                                                res, ARRAY_SIZE(res));
  20 }
  21
  22 static int __init virt_platform_init(void)
  23 {
  24         const struct resource goldfish_tty_res[] = {
  25                 DEFINE_RES_MEM(virt_bi_data.tty.mmio, 1),
  26                 DEFINE_RES_IRQ(virt_bi_data.tty.irq),
  27         };
  28         /* this is the second gf-rtc, the first one is used by the scheduler */
  29         const struct resource goldfish_rtc_res[] = {
  30                 DEFINE_RES_MEM(virt_bi_data.rtc.mmio + 0x1000, 0x1000),
  31                 DEFINE_RES_IRQ(virt_bi_data.rtc.irq + 1),
  32         };
  33         struct platform_device *pdev1, *pdev2;
  34         struct platform_device *pdevs[VIRTIO_BUS_NB];
  35         unsigned int i;
  36         int ret = 0;
  37
  38         if (!MACH_IS_VIRT)
  39                 return -ENODEV;
  40
  41         /* We need this to have DMA'able memory provided to goldfish-tty */
  42         min_low_pfn = 0;
  43
  44         pdev1 = platform_device_register_simple("goldfish_tty",
  45                                                 PLATFORM_DEVID_NONE,
  46                                                 goldfish_tty_res,
  47                                                 ARRAY_SIZE(goldfish_tty_res));
  48         if (IS_ERR(pdev1))
  49                 return PTR_ERR(pdev1);
  50
  51         pdev2 = platform_device_register_simple("goldfish_rtc",
  52                                                 PLATFORM_DEVID_NONE,
  53                                                 goldfish_rtc_res,
  54                                                 ARRAY_SIZE(goldfish_rtc_res));
  55         if (IS_ERR(pdev2)) {
  56                 ret = PTR_ERR(pdev2);
  57                 goto err_unregister_tty;
  58         }
  59
  60         for (i = 0; i < VIRTIO_BUS_NB; i++) {
  61                 pdevs[i] = virt_virtio_init(i);
  62                 if (IS_ERR(pdevs[i])) {
  63                         ret = PTR_ERR(pdevs[i]);
  64                         goto err_unregister_rtc_virtio;
  65                 }
  66         }
  67
  68         return 0;
  69
  70 err_unregister_rtc_virtio:
  71         while (i > 0)
  72                 platform_device_unregister(pdevs[--i]);
  73         platform_device_unregister(pdev2);
  74 err_unregister_tty:
  75         platform_device_unregister(pdev1);
  76
  77         return ret;
  78 }
  79
  80 arch_initcall(virt_platform_init);