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.h>
   8 #include <errno.h>
   9 #include <libfdt.h>
  10 #include <os.h>
  11 #include <asm/io.h>
  12 #include <asm/state.h>
  13 #include <dm/root.h>
  14
  15 DECLARE_GLOBAL_DATA_PTR;
  16
  17 /* Enable access to PCI memory with map_sysmem() */
  18 static bool enable_pci_map;
  19
  20 #ifdef CONFIG_PCI
  21 /* Last device that was mapped into memory, and length of mapping */
  22 static struct udevice *map_dev;
  23 unsigned long map_len;
  24 #endif
  25
  26 void sandbox_exit(void)
  27 {
  28         /* Do this here while it still has an effect */
  29         os_fd_restore();
  30         if (state_uninit())
  31                 os_exit(2);
  32
  33         if (dm_uninit())
  34                 os_exit(2);
  35
  36         /* This is considered normal termination for now */
  37         os_exit(0);
  38 }
  39
  40 /* delay x useconds */
  41 void __udelay(unsigned long usec)
  42 {
  43         struct sandbox_state *state = state_get_current();
  44
  45         if (!state->skip_delays)
  46                 os_usleep(usec);
  47 }
  48
  49 int cleanup_before_linux(void)
  50 {
  51         return 0;
  52 }
  53
  54 int cleanup_before_linux_select(int flags)
  55 {
  56         return 0;
  57 }
  58
  59 void *map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
  60 {
  61 #if defined(CONFIG_PCI) && !defined(CONFIG_SPL_BUILD)
  62         unsigned long plen = len;
  63         void *ptr;
  64
  65         map_dev = NULL;
  66         if (enable_pci_map && !pci_map_physmem(paddr, &len, &map_dev, &ptr)) {
  67                 if (plen != len) {
  68                         printf("%s: Warning: partial map at %x, wanted %lx, got %lx\n",
  69                                __func__, paddr, len, plen);
  70                 }
  71                 map_len = len;
  72                 return ptr;
  73         }
  74 #endif
  75
  76         return (void *)(gd->arch.ram_buf + paddr);
  77 }
  78
  79 void unmap_physmem(const void *vaddr, unsigned long flags)
  80 {
  81 #ifdef CONFIG_PCI
  82         if (map_dev) {
  83                 pci_unmap_physmem(vaddr, map_len, map_dev);
  84                 map_dev = NULL;
  85         }
  86 #endif
  87 }
  88
  89 void sandbox_set_enable_pci_map(int enable)
  90 {
  91         enable_pci_map = enable;
  92 }
  93
  94 phys_addr_t map_to_sysmem(const void *ptr)
  95 {
  96         return (u8 *)ptr - gd->arch.ram_buf;
  97 }
  98
  99 void flush_dcache_range(unsigned long start, unsigned long stop)
 100 {
 101 }
 102
 103 void invalidate_dcache_range(unsigned long start, unsigned long stop)
 104 {
 105 }
 106
 107 int sandbox_read_fdt_from_file(void)
 108 {
 109         struct sandbox_state *state = state_get_current();
 110         const char *fname = state->fdt_fname;
 111         void *blob;
 112         loff_t size;
 113         int err;
 114         int fd;
 115
 116         blob = map_sysmem(CONFIG_SYS_FDT_LOAD_ADDR, 0);
 117         if (!state->fdt_fname) {
 118                 err = fdt_create_empty_tree(blob, 256);
 119                 if (!err)
 120                         goto done;
 121                 printf("Unable to create empty FDT: %s\n", fdt_strerror(err));
 122                 return -EINVAL;
 123         }
 124
 125         err = os_get_filesize(fname, &size);
 126         if (err < 0) {
 127                 printf("Failed to file FDT file '%s'\n", fname);
 128                 return err;
 129         }
 130         fd = os_open(fname, OS_O_RDONLY);
 131         if (fd < 0) {
 132                 printf("Failed to open FDT file '%s'\n", fname);
 133                 return -EACCES;
 134         }
 135         if (os_read(fd, blob, size) != size) {
 136                 os_close(fd);
 137                 return -EIO;
 138         }
 139         os_close(fd);
 140
 141 done:
 142         gd->fdt_blob = blob;
 143
 144         return 0;
 145 }
 146
 147 ulong timer_get_boot_us(void)
 148 {
 149         static uint64_t base_count;
 150         uint64_t count = os_get_nsec();
 151
 152         if (!base_count)
 153                 base_count = count;
 154
 155         return (count - base_count) / 1000;
 156 }