include/asm-sparc/oplib.h

   1 /* $Id: oplib.h,v 1.23 2001/12/21 00:54:31 davem Exp $
   2  * oplib.h:  Describes the interface and available routines in the
   3  *           Linux Prom library.
   4  *
   5  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6  */
   7
   8 #ifndef __SPARC_OPLIB_H
   9 #define __SPARC_OPLIB_H
  10
  11 #include <asm/openprom.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/compiler.h>
  14
  15 /* The master romvec pointer... */
  16 extern struct linux_romvec *romvec;
  17
  18 /* Enumeration to describe the prom major version we have detected. */
  19 enum prom_major_version {
  20         PROM_V0,      /* Original sun4c V0 prom */
  21         PROM_V2,      /* sun4c and early sun4m V2 prom */
  22         PROM_V3,      /* sun4m and later, up to sun4d/sun4e machines V3 */
  23         PROM_P1275,   /* IEEE compliant ISA based Sun PROM, only sun4u */
  24         PROM_AP1000,  /* actually no prom at all */
  25         PROM_SUN4,    /* Old sun4 proms are totally different, but we'll shoehorn it to make it fit */
  26 };
  27
  28 extern enum prom_major_version prom_vers;
  29 /* Revision, and firmware revision. */
  30 extern unsigned int prom_rev, prom_prev;
  31
  32 /* Root node of the prom device tree, this stays constant after
  33  * initialization is complete.
  34  */
  35 extern int prom_root_node;
  36
  37 /* PROM stdin and stdout */
  38 extern int prom_stdin, prom_stdout;
  39
  40 /* Pointer to prom structure containing the device tree traversal
  41  * and usage utility functions.  Only prom-lib should use these,
  42  * users use the interface defined by the library only!
  43  */
  44 extern struct linux_nodeops *prom_nodeops;
  45
  46 /* The functions... */
  47
  48 /* You must call prom_init() before using any of the library services,
  49  * preferably as early as possible.  Pass it the romvec pointer.
  50  */
  51 extern void prom_init(struct linux_romvec *rom_ptr);
  52
  53 /* Boot argument acquisition, returns the boot command line string. */
  54 extern char *prom_getbootargs(void);
  55
  56 /* Device utilities. */
  57
  58 /* Map and unmap devices in IO space at virtual addresses. Note that the
  59  * virtual address you pass is a request and the prom may put your mappings
  60  * somewhere else, so check your return value as that is where your new
  61  * mappings really are!
  62  *
  63  * Another note, these are only available on V2 or higher proms!
  64  */
  65 extern char *prom_mapio(char *virt_hint, int io_space, unsigned int phys_addr, unsigned int num_bytes);
  66 extern void prom_unmapio(char *virt_addr, unsigned int num_bytes);
  67
  68 /* Device operations. */
  69
  70 /* Open the device described by the passed string.  Note, that the format
  71  * of the string is different on V0 vs. V2->higher proms.  The caller must
  72  * know what he/she is doing!  Returns the device descriptor, an int.
  73  */
  74 extern int prom_devopen(char *device_string);
  75
  76 /* Close a previously opened device described by the passed integer
  77  * descriptor.
  78  */
  79 extern int prom_devclose(int device_handle);
  80
  81 /* Do a seek operation on the device described by the passed integer
  82  * descriptor.
  83  */
  84 extern void prom_seek(int device_handle, unsigned int seek_hival,
  85                       unsigned int seek_lowval);
  86
  87 /* Machine memory configuration routine. */
  88
  89 /* This function returns a V0 format memory descriptor table, it has three
  90  * entries.  One for the total amount of physical ram on the machine, one
  91  * for the amount of physical ram available, and one describing the virtual
  92  * areas which are allocated by the prom.  So, in a sense the physical
  93  * available is a calculation of the total physical minus the physical mapped
  94  * by the prom with virtual mappings.
  95  *
  96  * These lists are returned pre-sorted, this should make your life easier
  97  * since the prom itself is way too lazy to do such nice things.
  98  */
  99 extern struct linux_mem_v0 *prom_meminfo(void);
 100
 101 /* Miscellaneous routines, don't really fit in any category per se. */
 102
 103 /* Reboot the machine with the command line passed. */
 104 extern void prom_reboot(char *boot_command);
 105
 106 /* Evaluate the forth string passed. */
 107 extern void prom_feval(char *forth_string);
 108
 109 /* Enter the prom, with possibility of continuation with the 'go'
 110  * command in newer proms.
 111  */
 112 extern void prom_cmdline(void);
 113
 114 /* Enter the prom, with no chance of continuation for the stand-alone
 115  * which calls this.
 116  */
 117 extern void prom_halt(void) __attribute__ ((noreturn));
 118
 119 /* Set the PROM 'sync' callback function to the passed function pointer.
 120  * When the user gives the 'sync' command at the prom prompt while the
 121  * kernel is still active, the prom will call this routine.
 122  *
 123  * XXX The arguments are different on V0 vs. V2->higher proms, grrr! XXX
 124  */
 125 typedef void (*sync_func_t)(void);
 126 extern void prom_setsync(sync_func_t func_ptr);
 127
 128 /* Acquire the IDPROM of the root node in the prom device tree.  This
 129  * gets passed a buffer where you would like it stuffed.  The return value
 130  * is the format type of this idprom or 0xff on error.
 131  */
 132 extern unsigned char prom_get_idprom(char *idp_buffer, int idpbuf_size);
 133
 134 /* Get the prom major version. */
 135 extern int prom_version(void);
 136
 137 /* Get the prom plugin revision. */
 138 extern int prom_getrev(void);
 139
 140 /* Get the prom firmware revision. */
 141 extern int prom_getprev(void);
 142
 143 /* Character operations to/from the console.... */
 144
 145 /* Non-blocking get character from console. */
 146 extern int prom_nbgetchar(void);
 147
 148 /* Non-blocking put character to console. */
 149 extern int prom_nbputchar(char character);
 150
 151 /* Blocking get character from console. */
 152 extern char prom_getchar(void);
 153
 154 /* Blocking put character to console. */
 155 extern void prom_putchar(char character);
 156
 157 /* Prom's internal routines, don't use in kernel/boot code. */
 158 extern void prom_printf(char *fmt, ...);
 159 extern void prom_write(const char *buf, unsigned int len);
 160
 161 /* Query for input device type */
 162
 163 enum prom_input_device {
 164         PROMDEV_IKBD,                   /* input from keyboard */
 165         PROMDEV_ITTYA,                  /* input from ttya */
 166         PROMDEV_ITTYB,                  /* input from ttyb */
 167         PROMDEV_IRSC,                   /* input from rsc */
 168         PROMDEV_IVCONS,                 /* input from virtual-console */
 169         PROMDEV_I_UNK,
 170 };
 171
 172 extern enum prom_input_device prom_query_input_device(void);
 173
 174 /* Query for output device type */
 175
 176 enum prom_output_device {
 177         PROMDEV_OSCREEN,                /* to screen */
 178         PROMDEV_OTTYA,                  /* to ttya */
 179         PROMDEV_OTTYB,                  /* to ttyb */
 180         PROMDEV_ORSC,                   /* to rsc */
 181         PROMDEV_OVCONS,                 /* to virtual-console */
 182         PROMDEV_O_UNK,
 183 };
 184
 185 extern enum prom_output_device prom_query_output_device(void);
 186
 187 /* Multiprocessor operations... */
 188
 189 /* Start the CPU with the given device tree node, context table, and context
 190  * at the passed program counter.
 191  */
 192 extern int prom_startcpu(int cpunode, struct linux_prom_registers *context_table,
 193                          int context, char *program_counter);
 194
 195 /* Stop the CPU with the passed device tree node. */
 196 extern int prom_stopcpu(int cpunode);
 197
 198 /* Idle the CPU with the passed device tree node. */
 199 extern int prom_idlecpu(int cpunode);
 200
 201 /* Re-Start the CPU with the passed device tree node. */
 202 extern int prom_restartcpu(int cpunode);
 203
 204 /* PROM memory allocation facilities... */
 205
 206 /* Allocated at possibly the given virtual address a chunk of the
 207  * indicated size.
 208  */
 209 extern char *prom_alloc(char *virt_hint, unsigned int size);
 210
 211 /* Free a previously allocated chunk. */
 212 extern void prom_free(char *virt_addr, unsigned int size);
 213
 214 /* Sun4/sun4c specific memory-management startup hook. */
 215
 216 /* Map the passed segment in the given context at the passed
 217  * virtual address.
 218  */
 219 extern void prom_putsegment(int context, unsigned long virt_addr,
 220                             int physical_segment);
 221
 222
 223 /* PROM device tree traversal functions... */
 224
 225 #ifdef PROMLIB_INTERNAL
 226
 227 /* Internal version of prom_getchild. */
 228 extern int __prom_getchild(int parent_node);
 229
 230 /* Internal version of prom_getsibling. */
 231 extern int __prom_getsibling(int node);
 232
 233 #endif
 234
 235
 236 /* Get the child node of the given node, or zero if no child exists. */
 237 extern int prom_getchild(int parent_node);
 238
 239 /* Get the next sibling node of the given node, or zero if no further
 240  * siblings exist.
 241  */
 242 extern int prom_getsibling(int node);
 243
 244 /* Get the length, at the passed node, of the given property type.
 245  * Returns -1 on error (ie. no such property at this node).
 246  */
 247 extern int prom_getproplen(int thisnode, char *property);
 248
 249 /* Fetch the requested property using the given buffer.  Returns
 250  * the number of bytes the prom put into your buffer or -1 on error.
 251  */
 252 extern int __must_check prom_getproperty(int thisnode, char *property,
 253                                          char *prop_buffer, int propbuf_size);
 254
 255 /* Acquire an integer property. */
 256 extern int prom_getint(int node, char *property);
 257
 258 /* Acquire an integer property, with a default value. */
 259 extern int prom_getintdefault(int node, char *property, int defval);
 260
 261 /* Acquire a boolean property, 0=FALSE 1=TRUE. */
 262 extern int prom_getbool(int node, char *prop);
 263
 264 /* Acquire a string property, null string on error. */
 265 extern void prom_getstring(int node, char *prop, char *buf, int bufsize);
 266
 267 /* Does the passed node have the given "name"? YES=1 NO=0 */
 268 extern int prom_nodematch(int thisnode, char *name);
 269
 270 /* Search all siblings starting at the passed node for "name" matching
 271  * the given string.  Returns the node on success, zero on failure.
 272  */
 273 extern int prom_searchsiblings(int node_start, char *name);
 274
 275 /* Return the first property type, as a string, for the given node.
 276  * Returns a null string on error.
 277  */
 278 extern char *prom_firstprop(int node, char *buffer);
 279
 280 /* Returns the next property after the passed property for the given
 281  * node.  Returns null string on failure.
 282  */
 283 extern char *prom_nextprop(int node, char *prev_property, char *buffer);
 284
 285 /* Returns phandle of the path specified */
 286 extern int prom_finddevice(char *name);
 287
 288 /* Returns 1 if the specified node has given property. */
 289 extern int prom_node_has_property(int node, char *property);
 290
 291 /* Set the indicated property at the given node with the passed value.
 292  * Returns the number of bytes of your value that the prom took.
 293  */
 294 extern int prom_setprop(int node, char *prop_name, char *prop_value,
 295                         int value_size);
 296
 297 extern int prom_pathtoinode(char *path);
 298 extern int prom_inst2pkg(int);
 299
 300 /* Dorking with Bus ranges... */
 301
 302 /* Apply promlib probes OBIO ranges to registers. */
 303 extern void prom_apply_obio_ranges(struct linux_prom_registers *obioregs, int nregs);
 304
 305 /* Apply ranges of any prom node (and optionally parent node as well) to registers. */
 306 extern void prom_apply_generic_ranges(int node, int parent,
 307                                       struct linux_prom_registers *sbusregs, int nregs);
 308
 309 /* CPU probing helpers.  */
 310 int cpu_find_by_instance(int instance, int *prom_node, int *mid);
 311 int cpu_find_by_mid(int mid, int *prom_node);
 312 int cpu_get_hwmid(int prom_node);
 313
 314 extern spinlock_t prom_lock;
 315
 316 #endif /* !(__SPARC_OPLIB_H) */