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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 <printf.h>
  31. #include <asm.h>
  32.  
  33. #define MAX_OFW_ARGS        10
  34.  
  35. /** OpenFirmware command structure
  36.  *
  37.  */
  38. typedef struct {
  39.     const char *service;          /**< Command name */
  40.     unsigned long nargs;          /**< Number of in arguments */
  41.     unsigned long nret;           /**< Number of out arguments */
  42.     ofw_arg_t args[MAX_OFW_ARGS]; /**< List of arguments */
  43. } ofw_args_t;
  44.  
  45. typedef void (*ofw_entry)(ofw_args_t *);
  46.  
  47. ofw_entry ofw;
  48.  
  49. phandle ofw_chosen;
  50. ihandle ofw_stdout;
  51. phandle ofw_root;
  52. ihandle ofw_mmu;
  53. phandle ofw_memory;
  54. phandle ofw_aliases;
  55.  
  56. static unsigned long ofw_call(const char *service, const int nargs, const int nret, ofw_arg_t *rets, ...)
  57. {
  58.     va_list list;
  59.     ofw_args_t args;
  60.     int i;
  61.    
  62.     args.service = service;
  63.     args.nargs = nargs;
  64.     args.nret = nret;
  65.    
  66.     va_start(list, rets);
  67.     for (i = 0; i < nargs; i++)
  68.         args.args[i] = va_arg(list, ofw_arg_t);
  69.     va_end(list);
  70.    
  71.     for (i = 0; i < nret; i++)
  72.         args.args[i + nargs] = 0;
  73.    
  74.     ofw(&args);
  75.    
  76.     for (i = 1; i < nret; i++)
  77.         rets[i - 1] = args.args[i + nargs];
  78.    
  79.     return args.args[nargs];
  80. }
  81.  
  82.  
  83. phandle ofw_find_device(const char *name)
  84. {
  85.     return ofw_call("finddevice", 1, 1, NULL, name);
  86. }
  87.  
  88.  
  89. int ofw_get_property(const phandle device, const char *name, const void *buf, const int buflen)
  90. {
  91.     return ofw_call("getprop", 4, 1, NULL, device, name, buf, buflen);
  92. }
  93.  
  94.  
  95. static unsigned int ofw_get_address_cells(const phandle device)
  96. {
  97.     unsigned int ret;
  98.    
  99.     if (ofw_get_property(device, "#address-cells", &ret, sizeof(ret)) <= 0)
  100.         if (ofw_get_property(ofw_root, "#address-cells", &ret, sizeof(ret)) <= 0)
  101.             ret = 1;
  102.    
  103.     return ret;
  104. }
  105.  
  106.  
  107. static unsigned int ofw_get_size_cells(const phandle device)
  108. {
  109.     unsigned int ret;
  110.    
  111.     if (ofw_get_property(device, "#size-cells", &ret, sizeof(ret)) <= 0)
  112.         if (ofw_get_property(ofw_root, "#size-cells", &ret, sizeof(ret)) <= 0)
  113.             ret = 1;
  114.    
  115.     return ret;
  116. }
  117.  
  118.  
  119. static ihandle ofw_open(const char *name)
  120. {
  121.     return ofw_call("open", 1, 1, NULL, name);
  122. }
  123.  
  124.  
  125. void init(void)
  126. {
  127.     ofw_chosen = ofw_find_device("/chosen");
  128.     if (ofw_chosen == -1)
  129.         halt();
  130.    
  131.     if (ofw_get_property(ofw_chosen, "stdout",  &ofw_stdout, sizeof(ofw_stdout)) <= 0)
  132.         ofw_stdout = 0;
  133.    
  134.     ofw_root = ofw_find_device("/");
  135.     if (ofw_root == -1) {
  136.         puts("\r\nError: Unable to find / device, halted.\r\n");
  137.         halt();
  138.     }
  139.    
  140.     if (ofw_get_property(ofw_chosen, "mmu",  &ofw_mmu, sizeof(ofw_mmu)) <= 0) {
  141.         puts("\r\nError: Unable to get mmu property, halted.\r\n");
  142.         halt();
  143.     }
  144.    
  145.     ofw_memory = ofw_find_device("/memory");
  146.     if (ofw_memory == -1) {
  147.         puts("\r\nError: Unable to find /memory device, halted.\r\n");
  148.         halt();
  149.     }
  150.    
  151.     ofw_aliases = ofw_find_device("/aliases");
  152.     if (ofw_aliases == -1) {
  153.         puts("\r\nError: Unable to find /aliases device, halted.\r\n");
  154.         halt();
  155.     }
  156. }
  157.  
  158.  
  159. void ofw_write(const char *str, const int len)
  160. {
  161.     if (ofw_stdout == 0)
  162.         return;
  163.    
  164.     ofw_call("write", 3, 1, NULL, ofw_stdout, str, len);
  165. }
  166.  
  167.  
  168. void *ofw_translate(const void *virt)
  169. {
  170.     ofw_arg_t result[3];
  171.    
  172.     if (ofw_call("call-method", 4, 4, result, "translate", ofw_mmu, virt, 1) != 0) {
  173.         puts("Error: MMU method translate() failed, halting.\n");
  174.         halt();
  175.     }
  176.     return (void *) result[2];
  177. }
  178.  
  179.  
  180. int ofw_map(const void *phys, const void *virt, const int size, const int mode)
  181. {
  182.     return ofw_call("call-method", 6, 1, NULL, "map", ofw_mmu, mode, size, virt, phys);
  183. }
  184.  
  185.  
  186. int ofw_memmap(memmap_t *map)
  187. {
  188.     unsigned long buf[BUF_SIZE];
  189.     int ret = ofw_get_property(ofw_memory, "reg", buf, sizeof(buf));
  190.     if (ret <= 0)
  191.         return false;
  192.        
  193.     unsigned int ac = ofw_get_address_cells(ofw_memory);
  194.     unsigned int sc = ofw_get_size_cells(ofw_memory);
  195.    
  196.     int pos;
  197.     map->total = 0;
  198.     map->count = 0;
  199.     for (pos = 0; (pos < ret / sizeof(unsigned long)) && (map->count < MEMMAP_MAX_RECORDS); pos += ac + sc) {
  200.         void * start = (void *) buf[pos + ac - 1];
  201.         unsigned int size = buf[pos + ac + sc - 1];
  202.        
  203.         if (size > 0) {
  204.             map->zones[map->count].start = start;
  205.             map->zones[map->count].size = size;
  206.             map->count++;
  207.             map->total += size;
  208.         }
  209.     }
  210. }
  211.  
  212.  
  213. int ofw_screen(screen_t *screen)
  214. {
  215.     char device_name[BUF_SIZE];
  216.    
  217.     if (ofw_get_property(ofw_aliases, "screen", device_name, sizeof(device_name)) <= 0)
  218.         return false;
  219.    
  220.     phandle device = ofw_find_device(device_name);
  221.     if (device == -1)
  222.         return false;
  223.    
  224.     if (ofw_get_property(device, "address", &screen->addr, sizeof(screen->addr)) <= 0)
  225.         return false;
  226.    
  227.     if (ofw_get_property(device, "width", &screen->width, sizeof(screen->width)) <= 0)
  228.         return false;
  229.    
  230.     if (ofw_get_property(device, "height", &screen->height, sizeof(screen->height)) <= 0)
  231.         return false;
  232.    
  233.     if (ofw_get_property(device, "depth", &screen->bpp, sizeof(screen->bpp)) <= 0)
  234.         return false;
  235.    
  236.     if (ofw_get_property(device, "linebytes", &screen->scanline, sizeof(screen->scanline)) <= 0)
  237.         return false;
  238.    
  239.     return true;
  240. }
  241.  
  242.