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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. 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, 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. int ofw_package_to_path(const phandle device, char *buf, const int buflen)
  133. {
  134.     return ofw_call("package-to-path", 3, 1, NULL, device, buf, buflen);
  135. }
  136.  
  137. unsigned int ofw_get_address_cells(const phandle device)
  138. {
  139.     unsigned int ret = 1;
  140.    
  141.     if (ofw_get_property(device, "#address-cells", &ret, sizeof(ret)) <= 0)
  142.         if (ofw_get_property(ofw_root, "#address-cells", &ret, sizeof(ret)) <= 0)
  143.             ret = OFW_ADDRESS_CELLS;
  144.    
  145.     return ret;
  146. }
  147.  
  148.  
  149. unsigned int ofw_get_size_cells(const phandle device)
  150. {
  151.     unsigned int ret;
  152.    
  153.     if (ofw_get_property(device, "#size-cells", &ret, sizeof(ret)) <= 0)
  154.         if (ofw_get_property(ofw_root, "#size-cells", &ret, sizeof(ret)) <= 0)
  155.             ret = OFW_SIZE_CELLS;
  156.    
  157.     return ret;
  158. }
  159.  
  160. phandle ofw_get_child_node(const phandle node)
  161. {
  162.     return ofw_call("child", 1, 1, NULL, node);
  163. }
  164.  
  165. phandle ofw_get_peer_node(const phandle node)
  166. {
  167.     return ofw_call("peer", 1, 1, NULL, node);
  168. }
  169.  
  170. static ihandle ofw_open(const char *name)
  171. {
  172.     return ofw_call("open", 1, 1, NULL, name);
  173. }
  174.  
  175.  
  176. void ofw_write(const char *str, const int len)
  177. {
  178.     if (ofw_stdout == 0)
  179.         return;
  180.    
  181.     ofw_call("write", 3, 1, NULL, ofw_stdout, str, len);
  182. }
  183.  
  184.  
  185. void *ofw_translate(const void *virt)
  186. {
  187.     ofw_arg_t result[4];
  188.     int shift;
  189.  
  190.     if (ofw_call("call-method", 3, 5, result, "translate", ofw_mmu, virt) != 0) {
  191.         puts("Error: MMU method translate() failed, halting.\n");
  192.         halt();
  193.     }
  194.  
  195.     if (ofw_translate_failed(result[0]))
  196.         return NULL;
  197.  
  198.     if (sizeof(unative_t) == 8)
  199.         shift = 32;
  200.     else
  201.         shift = 0;
  202.  
  203.     return (void *) ((result[2]<<shift)|result[3]);
  204. }
  205.  
  206. void *ofw_claim(const void *virt, const int len)
  207. {
  208.     ofw_arg_t retaddr;
  209.     int shift;
  210.  
  211.     if (ofw_call("call-method", 5, 2, &retaddr, "claim", ofw_mmu, 0, len, virt) != 0) {
  212.         puts("Error: MMU method claim() failed, halting.\n");
  213.         halt();
  214.     }
  215.  
  216.     return (void *) retaddr;
  217. }
  218.  
  219. int ofw_map(const void *phys, const void *virt, const int size, const int mode)
  220. {
  221.     uintptr_t phys_hi, phys_lo;
  222.  
  223.     if (sizeof(unative_t) == 8) {
  224.         int shift = 32;
  225.         phys_hi = (uintptr_t) phys >> shift;
  226.         phys_lo = (uintptr_t) phys & 0xffffffff;
  227.     } else {
  228.         phys_hi = 0;
  229.         phys_lo = (uintptr_t) phys;
  230.     }
  231.  
  232.     return ofw_call("call-method", 7, 1, NULL, "map", ofw_mmu, mode, size, virt,
  233.         phys_hi, phys_lo);
  234. }
  235.  
  236.  
  237. int ofw_memmap(memmap_t *map)
  238. {
  239.     unsigned int ac = ofw_get_address_cells(ofw_memory);
  240.     unsigned int sc = ofw_get_size_cells(ofw_memory);
  241.  
  242.     uint32_t buf[((ac+sc)*MEMMAP_MAX_RECORDS)];
  243.     int ret = ofw_get_property(ofw_memory, "reg", buf, sizeof(buf));
  244.     if (ret <= 0)       /* ret is the number of written bytes */
  245.         return false;
  246.  
  247.     int pos;
  248.     map->total = 0;
  249.     map->count = 0;
  250.     for (pos = 0; (pos < ret / sizeof(uint32_t)) && (map->count < MEMMAP_MAX_RECORDS); pos += ac + sc) {
  251.         void * start = (void *) ((uintptr_t) buf[pos + ac - 1]);
  252.         unsigned int size = buf[pos + ac + sc - 1];
  253.        
  254.         if (size > 0) {
  255.             map->zones[map->count].start = start;
  256.             map->zones[map->count].size = size;
  257.             map->count++;
  258.             map->total += size;
  259.         }
  260.     }
  261.    
  262.     return true;
  263. }
  264.  
  265.  
  266. int ofw_screen(screen_t *screen)
  267. {
  268.     char device_name[BUF_SIZE];
  269.     uint32_t virtaddr;
  270.    
  271.     if (ofw_get_property(ofw_aliases, "screen", device_name, sizeof(device_name)) <= 0)
  272.         return false;
  273.    
  274.     phandle device = ofw_find_device(device_name);
  275.     if (device == -1)
  276.         return false;
  277.    
  278.     if (ofw_get_property(device, "address", &virtaddr, sizeof(virtaddr)) <= 0)
  279.         return false;
  280.  
  281.     screen->addr = (void *) ((uintptr_t) virtaddr);
  282.  
  283.     if (ofw_get_property(device, "width", &screen->width, sizeof(screen->width)) <= 0)
  284.         return false;
  285.    
  286.     if (ofw_get_property(device, "height", &screen->height, sizeof(screen->height)) <= 0)
  287.         return false;
  288.    
  289.     if (ofw_get_property(device, "depth", &screen->bpp, sizeof(screen->bpp)) <= 0)
  290.         return false;
  291.    
  292.     if (ofw_get_property(device, "linebytes", &screen->scanline, sizeof(screen->scanline)) <= 0)
  293.         return false;
  294.    
  295.     return true;
  296. }
  297.  
  298.  
  299. void ofw_quiesce(void)
  300. {
  301.     ofw_call("quiesce", 0, 0, NULL);
  302. }
  303.