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 reset_cpu(ulong ignored)
  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 int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  38 {
  39         reset_cpu(0);
  40
  41         return 0;
  42 }
  43
  44 /* delay x useconds */
  45 void __udelay(unsigned long usec)
  46 {
  47         os_usleep(usec);
  48 }
  49
  50 int cleanup_before_linux(void)
  51 {
  52         return 0;
  53 }
  54
  55 int cleanup_before_linux_select(int flags)
  56 {
  57         return 0;
  58 }
  59
  60 void *map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
  61 {
  62 #ifdef CONFIG_PCI
  63         unsigned long plen = len;
  64         void *ptr;
  65
  66         map_dev = NULL;
  67         if (enable_pci_map && !pci_map_physmem(paddr, &len, &map_dev, &ptr)) {
  68                 if (plen != len) {
  69                         printf("%s: Warning: partial map at %x, wanted %lx, got %lx\n",
  70                                __func__, paddr, len, plen);
  71                 }
  72                 map_len = len;
  73                 return ptr;
  74         }
  75 #endif
  76
  77         return (void *)(gd->arch.ram_buf + paddr);
  78 }
  79
  80 void unmap_physmem(const void *vaddr, unsigned long flags)
  81 {
  82 #ifdef CONFIG_PCI
  83         if (map_dev) {
  84                 pci_unmap_physmem(vaddr, map_len, map_dev);
  85                 map_dev = NULL;
  86         }
  87 #endif
  88 }
  89
  90 void sandbox_set_enable_pci_map(int enable)
  91 {
  92         enable_pci_map = enable;
  93 }
  94
  95 phys_addr_t map_to_sysmem(const void *ptr)
  96 {
  97         return (u8 *)ptr - gd->arch.ram_buf;
  98 }
  99
 100 void flush_dcache_range(unsigned long start, unsigned long stop)
 101 {
 102 }
 103
 104 int sandbox_read_fdt_from_file(void)
 105 {
 106         struct sandbox_state *state = state_get_current();
 107         const char *fname = state->fdt_fname;
 108         void *blob;
 109         loff_t size;
 110         int err;
 111         int fd;
 112
 113         blob = map_sysmem(CONFIG_SYS_FDT_LOAD_ADDR, 0);
 114         if (!state->fdt_fname) {
 115                 err = fdt_create_empty_tree(blob, 256);
 116                 if (!err)
 117                         goto done;
 118                 printf("Unable to create empty FDT: %s\n", fdt_strerror(err));
 119                 return -EINVAL;
 120         }
 121
 122         err = os_get_filesize(fname, &size);
 123         if (err < 0) {
 124                 printf("Failed to file FDT file '%s'\n", fname);
 125                 return err;
 126         }
 127         fd = os_open(fname, OS_O_RDONLY);
 128         if (fd < 0) {
 129                 printf("Failed to open FDT file '%s'\n", fname);
 130                 return -EACCES;
 131         }
 132         if (os_read(fd, blob, size) != size) {
 133                 os_close(fd);
 134                 return -EIO;
 135         }
 136         os_close(fd);
 137
 138 done:
 139         gd->fdt_blob = blob;
 140
 141         return 0;
 142 }