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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. phandle ofw_find_device(const char *name)
  113. {
  114.     return ofw_call("finddevice", 1, 1, NULL, name);
  115. }
  116.  
  117. int ofw_get_property(const phandle device, const char *name, const void *buf, const int buflen)
  118. {
  119.     return ofw_call("getprop", 4, 1, NULL, device, name, buf, buflen);
  120. }
  121.  
  122. int ofw_get_proplen(const phandle device, const char *name)
  123. {
  124.     return ofw_call("getproplen", 2, 1, NULL, device, name);
  125. }
  126.  
  127. int ofw_next_property(const phandle device, char *previous, char *buf)
  128. {
  129.     return ofw_call("nextprop", 3, 1, NULL, device, previous, buf);
  130. }
  131.  
  132. unsigned int ofw_get_address_cells(const phandle device)
  133. {
  134.     unsigned int ret = 1;
  135.    
  136.     if (ofw_get_property(device, "#address-cells", &ret, sizeof(ret)) <= 0)
  137.         if (ofw_get_property(ofw_root, "#address-cells", &ret, sizeof(ret)) <= 0)
  138.             ret = OFW_ADDRESS_CELLS;
  139.    
  140.     return ret;
  141. }
  142.  
  143.  
  144. unsigned int ofw_get_size_cells(const phandle device)
  145. {
  146.     unsigned int ret;
  147.    
  148.     if (ofw_get_property(device, "#size-cells", &ret, sizeof(ret)) <= 0)
  149.         if (ofw_get_property(ofw_root, "#size-cells", &ret, sizeof(ret)) <= 0)
  150.             ret = OFW_SIZE_CELLS;
  151.    
  152.     return ret;
  153. }
  154.  
  155. phandle ofw_get_child_node(const phandle node)
  156. {
  157.     return ofw_call("child", 1, 1, NULL, node);
  158. }
  159.  
  160. phandle ofw_get_peer_node(const phandle node)
  161. {
  162.     return ofw_call("peer", 1, 1, NULL, node);
  163. }
  164.  
  165. static ihandle ofw_open(const char *name)
  166. {
  167.     return ofw_call("open", 1, 1, NULL, name);
  168. }
  169.  
  170.  
  171. void ofw_write(const char *str, const int len)
  172. {
  173.     if (ofw_stdout == 0)
  174.         return;
  175.    
  176.     ofw_call("write", 3, 1, NULL, ofw_stdout, str, len);
  177. }
  178.  
  179.  
  180. void *ofw_translate(const void *virt)
  181. {
  182.     ofw_arg_t result[4];
  183.     int shift;
  184.  
  185.     if (ofw_call("call-method", 3, 5, result, "translate", ofw_mmu, virt) != 0) {
  186.         puts("Error: MMU method translate() failed, halting.\n");
  187.         halt();
  188.     }
  189.  
  190.     if (ofw_translate_failed(result[0]))
  191.         return NULL;
  192.  
  193.     if (sizeof(unative_t) == 8)
  194.         shift = 32;
  195.     else
  196.         shift = 0;
  197.  
  198.     return (void *) ((result[2]<<shift)|result[3]);
  199. }
  200.  
  201. void *ofw_claim(const void *virt, const int len)
  202. {
  203.     ofw_arg_t retaddr;
  204.     int shift;
  205.  
  206.     if (ofw_call("call-method", 5, 2, &retaddr, "claim", ofw_mmu, 0, len, virt) != 0) {
  207.         puts("Error: MMU method claim() failed, halting.\n");
  208.         halt();
  209.     }
  210.  
  211.     return (void *) retaddr;
  212. }
  213.  
  214. int ofw_map(const void *phys, const void *virt, const int size, const int mode)
  215. {
  216.     uintptr_t phys_hi, phys_lo;
  217.  
  218.     if (sizeof(unative_t) == 8) {
  219.         int shift = 32;
  220.         phys_hi = (uintptr_t) phys >> shift;
  221.         phys_lo = (uintptr_t) phys & 0xffffffff;
  222.     } else {
  223.         phys_hi = 0;
  224.         phys_lo = (uintptr_t) phys;
  225.     }
  226.  
  227.     return ofw_call("call-method", 7, 1, NULL, "map", ofw_mmu, mode, size, virt,
  228.         phys_hi, phys_lo);
  229. }
  230.  
  231.  
  232. int ofw_memmap(memmap_t *map)
  233. {
  234.     unsigned int ac = ofw_get_address_cells(ofw_memory);
  235.     unsigned int sc = ofw_get_size_cells(ofw_memory);
  236.  
  237.     uint32_t buf[((ac+sc)*MEMMAP_MAX_RECORDS)];
  238.     int ret = ofw_get_property(ofw_memory, "reg", buf, sizeof(buf));
  239.     if (ret <= 0)       /* ret is the number of written bytes */
  240.         return false;
  241.  
  242.     int pos;
  243.     map->total = 0;
  244.     map->count = 0;
  245.     for (pos = 0; (pos < ret / sizeof(uint32_t)) && (map->count < MEMMAP_MAX_RECORDS); pos += ac + sc) {
  246.         void * start = (void *) ((uintptr_t) buf[pos + ac - 1]);
  247.         unsigned int size = buf[pos + ac + sc - 1];
  248.        
  249.         if (size > 0) {
  250.             map->zones[map->count].start = start;
  251.             map->zones[map->count].size = size;
  252.             map->count++;
  253.             map->total += size;
  254.         }
  255.     }
  256.    
  257.     return true;
  258. }
  259.  
  260.  
  261. int ofw_screen(screen_t *screen)
  262. {
  263.     char device_name[BUF_SIZE];
  264.     uint32_t virtaddr;
  265.    
  266.     if (ofw_get_property(ofw_aliases, "screen", device_name, sizeof(device_name)) <= 0)
  267.         return false;
  268.    
  269.     phandle device = ofw_find_device(device_name);
  270.     if (device == -1)
  271.         return false;
  272.    
  273.     if (ofw_get_property(device, "address", &virtaddr, sizeof(virtaddr)) <= 0)
  274.         return false;
  275.  
  276.     screen->addr = (void *) ((uintptr_t) virtaddr);
  277.  
  278.     if (ofw_get_property(device, "width", &screen->width, sizeof(screen->width)) <= 0)
  279.         return false;
  280.    
  281.     if (ofw_get_property(device, "height", &screen->height, sizeof(screen->height)) <= 0)
  282.         return false;
  283.    
  284.     if (ofw_get_property(device, "depth", &screen->bpp, sizeof(screen->bpp)) <= 0)
  285.         return false;
  286.    
  287.     if (ofw_get_property(device, "linebytes", &screen->scanline, sizeof(screen->scanline)) <= 0)
  288.         return false;
  289.    
  290.     return true;
  291. }
  292.