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  1. /*
  2.  * Copyright (C) 2005 Martin Decky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <ofw.h>
  30. #include <ofwarch.h>
  31. #include <printf.h>
  32. #include <asm.h>
  33. #include <types.h>
  34.  
  35. uintptr_t ofw_cif;
  36.  
  37. phandle ofw_chosen;
  38. ihandle ofw_stdout;
  39. phandle ofw_root;
  40. ihandle ofw_mmu;
  41. phandle ofw_memory;
  42. phandle ofw_aliases;
  43.  
  44. void ofw_init(void)
  45. {
  46.     ofw_chosen = ofw_find_device("/chosen");
  47.     if (ofw_chosen == -1)
  48.         halt();
  49.    
  50.     if (ofw_get_property(ofw_chosen, "stdout",  &ofw_stdout, sizeof(ofw_stdout)) <= 0)
  51.         ofw_stdout = 0;
  52.    
  53.     ofw_root = ofw_find_device("/");
  54.     if (ofw_root == -1) {
  55.         puts("\r\nError: Unable to find / device, halted.\r\n");
  56.         halt();
  57.     }
  58.    
  59.     if (ofw_get_property(ofw_chosen, "mmu",  &ofw_mmu, sizeof(ofw_mmu)) <= 0) {
  60.         puts("\r\nError: Unable to get mmu property, halted.\r\n");
  61.         halt();
  62.     }
  63.  
  64.     ofw_memory = ofw_find_device("/memory");
  65.     if (ofw_memory == -1) {
  66.         puts("\r\nError: Unable to find /memory device, halted.\r\n");
  67.         halt();
  68.     }
  69.    
  70.     ofw_aliases = ofw_find_device("/aliases");
  71.     if (ofw_aliases == -1) {
  72.         puts("\r\nError: Unable to find /aliases device, halted.\r\n");
  73.         halt();
  74.     }
  75. }
  76.  
  77. /** Perform a call to OpenFirmware client interface.
  78.  *
  79.  * @param service String identifying the service requested.
  80.  * @param nargs Number of input arguments.
  81.  * @param nret Number of output arguments. This includes the return value.
  82.  * @param rets Buffer for output arguments or NULL. The buffer must accommodate nret - 1 items.
  83.  *
  84.  * @return Return value returned by the client interface.
  85.  */
  86. static unsigned long ofw_call(const char *service, const int nargs, const int nret, ofw_arg_t *rets, ...)
  87. {
  88.     va_list list;
  89.     ofw_args_t args;
  90.     int i;
  91.    
  92.     args.service = (ofw_arg_t) service;
  93.     args.nargs = nargs;
  94.     args.nret = nret;
  95.    
  96.     va_start(list, rets);
  97.     for (i = 0; i < nargs; i++)
  98.         args.args[i] = va_arg(list, ofw_arg_t);
  99.     va_end(list);
  100.    
  101.     for (i = 0; i < nret; i++)
  102.         args.args[i + nargs] = 0;
  103.    
  104.     (void) ofw(&args);
  105.  
  106.     for (i = 1; i < nret; i++)
  107.         rets[i - 1] = args.args[i + nargs];
  108.  
  109.     return args.args[nargs];
  110. }
  111.  
  112.  
  113. phandle ofw_find_device(const char *name)
  114. {
  115.     return ofw_call("finddevice", 1, 1, NULL, name);
  116. }
  117.  
  118.  
  119. int ofw_get_property(const phandle device, const char *name, const void *buf, const int buflen)
  120. {
  121.     return ofw_call("getprop", 4, 1, NULL, device, name, buf, buflen);
  122. }
  123.  
  124.  
  125. unsigned int ofw_get_address_cells(const phandle device)
  126. {
  127.     unsigned int ret = 1;
  128.    
  129.     if (ofw_get_property(device, "#address-cells", &ret, sizeof(ret)) <= 0)
  130.         if (ofw_get_property(ofw_root, "#address-cells", &ret, sizeof(ret)) <= 0)
  131.             ret = OFW_ADDRESS_CELLS;
  132.    
  133.     return ret;
  134. }
  135.  
  136.  
  137. unsigned int ofw_get_size_cells(const phandle device)
  138. {
  139.     unsigned int ret;
  140.    
  141.     if (ofw_get_property(device, "#size-cells", &ret, sizeof(ret)) <= 0)
  142.         if (ofw_get_property(ofw_root, "#size-cells", &ret, sizeof(ret)) <= 0)
  143.             ret = OFW_SIZE_CELLS;
  144.    
  145.     return ret;
  146. }
  147.  
  148.  
  149. static ihandle ofw_open(const char *name)
  150. {
  151.     return ofw_call("open", 1, 1, NULL, name);
  152. }
  153.  
  154.  
  155. void ofw_write(const char *str, const int len)
  156. {
  157.     if (ofw_stdout == 0)
  158.         return;
  159.    
  160.     ofw_call("write", 3, 1, NULL, ofw_stdout, str, len);
  161. }
  162.  
  163.  
  164. void *ofw_translate(const void *virt)
  165. {
  166.     ofw_arg_t result[4];
  167.     int shift;
  168.  
  169.     if (ofw_call("call-method", 3, 5, result, "translate", ofw_mmu, virt) != 0) {
  170.         puts("Error: MMU method translate() failed, halting.\n");
  171.         halt();
  172.     }
  173.  
  174.     if (ofw_translate_failed(result[0]))
  175.         return NULL;
  176.  
  177.     if (sizeof(unative_t) == 8)
  178.         shift = 32;
  179.     else
  180.         shift = 0;
  181.  
  182.     return (void *) ((result[2]<<shift)|result[3]);
  183. }
  184.  
  185. void *ofw_claim(const void *virt, const int len)
  186. {
  187.     ofw_arg_t retaddr;
  188.     int shift;
  189.  
  190.     if (ofw_call("call-method", 5, 2, &retaddr, "claim", ofw_mmu, 0, len, virt) != 0) {
  191.         puts("Error: MMU method claim() failed, halting.\n");
  192.         halt();
  193.     }
  194.  
  195.     return (void *) retaddr;
  196. }
  197.  
  198. int ofw_map(const void *phys, const void *virt, const int size, const int mode)
  199. {
  200.     uintptr_t phys_hi, phys_lo;
  201.  
  202.     if (sizeof(unative_t) == 8) {
  203.         int shift = 32;
  204.         phys_hi = (uintptr_t) phys >> shift;
  205.         phys_lo = (uintptr_t) phys & 0xffffffff;
  206.     } else {
  207.         phys_hi = 0;
  208.         phys_lo = (uintptr_t) phys;
  209.     }
  210.  
  211.     return ofw_call("call-method", 7, 1, NULL, "map", ofw_mmu, mode, size, virt,
  212.         phys_hi, phys_lo);
  213. }
  214.  
  215.  
  216. int ofw_memmap(memmap_t *map)
  217. {
  218.     unsigned int ac = ofw_get_address_cells(ofw_memory);
  219.     unsigned int sc = ofw_get_size_cells(ofw_memory);
  220.  
  221.     uint32_t buf[((ac+sc)*MEMMAP_MAX_RECORDS)];
  222.     int ret = ofw_get_property(ofw_memory, "reg", buf, sizeof(buf));
  223.     if (ret <= 0)       /* ret is the number of written bytes */
  224.         return false;
  225.  
  226.     int pos;
  227.     map->total = 0;
  228.     map->count = 0;
  229.     for (pos = 0; (pos < ret / sizeof(uint32_t)) && (map->count < MEMMAP_MAX_RECORDS); pos += ac + sc) {
  230.         void * start = (void *) ((uintptr_t) buf[pos + ac - 1]);
  231.         unsigned int size = buf[pos + ac + sc - 1];
  232.        
  233.         if (size > 0) {
  234.             map->zones[map->count].start = start;
  235.             map->zones[map->count].size = size;
  236.             map->count++;
  237.             map->total += size;
  238.         }
  239.     }
  240.    
  241.     return true;
  242. }
  243.  
  244.  
  245. int ofw_screen(screen_t *screen)
  246. {
  247.     char device_name[BUF_SIZE];
  248.     uint32_t virtaddr;
  249.    
  250.     if (ofw_get_property(ofw_aliases, "screen", device_name, sizeof(device_name)) <= 0)
  251.         return false;
  252.    
  253.     phandle device = ofw_find_device(device_name);
  254.     if (device == -1)
  255.         return false;
  256.    
  257.     if (ofw_get_property(device, "address", &virtaddr, sizeof(virtaddr)) <= 0)
  258.         return false;
  259.  
  260.     screen->addr = (void *) ((uintptr_t) virtaddr);
  261.  
  262.     if (ofw_get_property(device, "width", &screen->width, sizeof(screen->width)) <= 0)
  263.         return false;
  264.    
  265.     if (ofw_get_property(device, "height", &screen->height, sizeof(screen->height)) <= 0)
  266.         return false;
  267.    
  268.     if (ofw_get_property(device, "depth", &screen->bpp, sizeof(screen->bpp)) <= 0)
  269.         return false;
  270.    
  271.     if (ofw_get_property(device, "linebytes", &screen->scanline, sizeof(screen->scanline)) <= 0)
  272.         return false;
  273.    
  274.     return true;
  275. }
  276.