arch/sandbox/cpu/cpu.c

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  * SPDX-License-Identifier:     GPL-2.0+
   4  */
   5 #define DEBUG
   6 #include <common.h>
   7 #include <dm/root.h>
   8 #include <os.h>
   9 #include <asm/io.h>
  10 #include <asm/state.h>
  11
  12 DECLARE_GLOBAL_DATA_PTR;
  13
  14 /* Enable access to PCI memory with map_sysmem() */
  15 static bool enable_pci_map;
  16
  17 #ifdef CONFIG_PCI
  18 /* Last device that was mapped into memory, and length of mapping */
  19 static struct udevice *map_dev;
  20 unsigned long map_len;
  21 #endif
  22
  23 void sandbox_exit(void)
  24 {
  25         /* Do this here while it still has an effect */
  26         os_fd_restore();
  27         if (state_uninit())
  28                 os_exit(2);
  29
  30         if (dm_uninit())
  31                 os_exit(2);
  32
  33         /* This is considered normal termination for now */
  34         os_exit(0);
  35 }
  36
  37 /* delay x useconds */
  38 void __udelay(unsigned long usec)
  39 {
  40         os_usleep(usec);
  41 }
  42
  43 int cleanup_before_linux(void)
  44 {
  45         return 0;
  46 }
  47
  48 int cleanup_before_linux_select(int flags)
  49 {
  50         return 0;
  51 }
  52
  53 void *map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
  54 {
  55 #ifdef CONFIG_PCI
  56         unsigned long plen = len;
  57         void *ptr;
  58
  59         map_dev = NULL;
  60         if (enable_pci_map && !pci_map_physmem(paddr, &len, &map_dev, &ptr)) {
  61                 if (plen != len) {
  62                         printf("%s: Warning: partial map at %x, wanted %lx, got %lx\n",
  63                                __func__, paddr, len, plen);
  64                 }
  65                 map_len = len;
  66                 return ptr;
  67         }
  68 #endif
  69
  70         return (void *)(gd->arch.ram_buf + paddr);
  71 }
  72
  73 void unmap_physmem(const void *vaddr, unsigned long flags)
  74 {
  75 #ifdef CONFIG_PCI
  76         if (map_dev) {
  77                 pci_unmap_physmem(vaddr, map_len, map_dev);
  78                 map_dev = NULL;
  79         }
  80 #endif
  81 }
  82
  83 void sandbox_set_enable_pci_map(int enable)
  84 {
  85         enable_pci_map = enable;
  86 }
  87
  88 phys_addr_t map_to_sysmem(const void *ptr)
  89 {
  90         return (u8 *)ptr - gd->arch.ram_buf;
  91 }
  92
  93 void flush_dcache_range(unsigned long start, unsigned long stop)
  94 {
  95 }
  96
  97 int sandbox_read_fdt_from_file(void)
  98 {
  99         struct sandbox_state *state = state_get_current();
 100         const char *fname = state->fdt_fname;
 101         void *blob;
 102         loff_t size;
 103         int err;
 104         int fd;
 105
 106         blob = map_sysmem(CONFIG_SYS_FDT_LOAD_ADDR, 0);
 107         if (!state->fdt_fname) {
 108                 err = fdt_create_empty_tree(blob, 256);
 109                 if (!err)
 110                         goto done;
 111                 printf("Unable to create empty FDT: %s\n", fdt_strerror(err));
 112                 return -EINVAL;
 113         }
 114
 115         err = os_get_filesize(fname, &size);
 116         if (err < 0) {
 117                 printf("Failed to file FDT file '%s'\n", fname);
 118                 return err;
 119         }
 120         fd = os_open(fname, OS_O_RDONLY);
 121         if (fd < 0) {
 122                 printf("Failed to open FDT file '%s'\n", fname);
 123                 return -EACCES;
 124         }
 125         if (os_read(fd, blob, size) != size) {
 126                 os_close(fd);
 127                 return -EIO;
 128         }
 129         os_close(fd);
 130
 131 done:
 132         gd->fdt_blob = blob;
 133
 134         return 0;
 135 }