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prom.c
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/*
* Procedures for interfacing to the Open Firmware PROM on
* Power Macintosh computers.
*
* In particular, we are interested in the device tree
* and in using some of its services (exit, write to stdout).
*
* Paul Mackerras August 1996.
* Copyright (C) 1996 Paul Mackerras.
*/
#include <stdarg.h>
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/version.h>
#include <linux/threads.h>
#include <linux/spinlock.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <asm/sections.h>
#include <asm/prom.h>
#include <asm/page.h>
#include <asm/processor.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/bootx.h>
#include <asm/system.h>
#include <asm/mmu.h>
#include <asm/pgtable.h>
#include <asm/bootinfo.h>
#include <asm/btext.h>
#include <asm/pci-bridge.h>
#include <asm/open_pic.h>
struct pci_address {
unsigned a_hi;
unsigned a_mid;
unsigned a_lo;
};
struct pci_reg_property {
struct pci_address addr;
unsigned size_hi;
unsigned size_lo;
};
struct isa_reg_property {
unsigned space;
unsigned address;
unsigned size;
};
typedef unsigned long interpret_func(struct device_node *, unsigned long,
int, int);
static interpret_func interpret_pci_props;
static interpret_func interpret_dbdma_props;
static interpret_func interpret_isa_props;
static interpret_func interpret_macio_props;
static interpret_func interpret_root_props;
extern char *klimit;
/* Set for a newworld or CHRP machine */
int use_of_interrupt_tree;
struct device_node *dflt_interrupt_controller;
int num_interrupt_controllers;
int pmac_newworld;
extern unsigned int rtas_entry; /* physical pointer */
extern struct device_node *allnodes;
static unsigned long finish_node(struct device_node *, unsigned long,
interpret_func *, int, int);
static unsigned long finish_node_interrupts(struct device_node *, unsigned long);
static struct device_node *find_phandle(phandle);
extern void enter_rtas(void *);
void phys_call_rtas(int, int, int, ...);
extern char cmd_line[512]; /* XXX */
extern boot_infos_t *boot_infos;
unsigned long dev_tree_size;
void __openfirmware
phys_call_rtas(int service, int nargs, int nret, ...)
{
va_list list;
union {
unsigned long words[16];
double align;
} u;
void (*rtas)(void *, unsigned long);
int i;
u.words[0] = service;
u.words[1] = nargs;
u.words[2] = nret;
va_start(list, nret);
for (i = 0; i < nargs; ++i)
u.words[i+3] = va_arg(list, unsigned long);
va_end(list);
rtas = (void (*)(void *, unsigned long)) rtas_entry;
rtas(&u, rtas_data);
}
/*
* finish_device_tree is called once things are running normally
* (i.e. with text and data mapped to the address they were linked at).
* It traverses the device tree and fills in the name, type,
* {n_}addrs and {n_}intrs fields of each node.
*/
void __init
finish_device_tree(void)
{
unsigned long mem = (unsigned long) klimit;
struct device_node *np;
/* All newworld pmac machines and CHRPs now use the interrupt tree */
for (np = allnodes; np != NULL; np = np->allnext) {
if (get_property(np, "interrupt-parent", NULL)) {
use_of_interrupt_tree = 1;
break;
}
}
if (_machine == _MACH_Pmac && use_of_interrupt_tree)
pmac_newworld = 1;
#ifdef CONFIG_BOOTX_TEXT
if (boot_infos && pmac_newworld) {
prom_print("WARNING ! BootX/miBoot booting is not supported on this machine\n");
prom_print(" You should use an Open Firmware bootloader\n");
}
#endif /* CONFIG_BOOTX_TEXT */
if (use_of_interrupt_tree) {
/*
* We want to find out here how many interrupt-controller
* nodes there are, and if we are booted from BootX,
* we need a pointer to the first (and hopefully only)
* such node. But we can't use find_devices here since
* np->name has not been set yet. -- paulus
*/
int n = 0;
char *name, *ic;
int iclen;
for (np = allnodes; np != NULL; np = np->allnext) {
ic = get_property(np, "interrupt-controller", &iclen);
name = get_property(np, "name", NULL);
/* checking iclen makes sure we don't get a false
match on /chosen.interrupt_controller */
if ((name != NULL
&& strcmp(name, "interrupt-controller") == 0)
|| (ic != NULL && iclen == 0 && strcmp(name, "AppleKiwi"))) {
if (n == 0)
dflt_interrupt_controller = np;
++n;
}
}
num_interrupt_controllers = n;
}
mem = finish_node(allnodes, mem, NULL, 1, 1);
dev_tree_size = mem - (unsigned long) allnodes;
klimit = (char *) mem;
}
static unsigned long __init
finish_node(struct device_node *np, unsigned long mem_start,
interpret_func *ifunc, int naddrc, int nsizec)
{
struct device_node *child;
int *ip;
np->name = get_property(np, "name", NULL);
np->type = get_property(np, "device_type", NULL);
if (!np->name)
np->name = "<NULL>";
if (!np->type)
np->type = "<NULL>";
/* get the device addresses and interrupts */
if (ifunc != NULL)
mem_start = ifunc(np, mem_start, naddrc, nsizec);
if (use_of_interrupt_tree)
mem_start = finish_node_interrupts(np, mem_start);
/* Look for #address-cells and #size-cells properties. */
ip = (int *) get_property(np, "#address-cells", NULL);
if (ip != NULL)
naddrc = *ip;
ip = (int *) get_property(np, "#size-cells", NULL);
if (ip != NULL)
nsizec = *ip;
if (np->parent == NULL)
ifunc = interpret_root_props;
else if (np->type == 0)
ifunc = NULL;
else if (!strcmp(np->type, "pci") || !strcmp(np->type, "vci"))
ifunc = interpret_pci_props;
else if (!strcmp(np->type, "dbdma"))
ifunc = interpret_dbdma_props;
else if (!strcmp(np->type, "mac-io")
|| ifunc == interpret_macio_props)
ifunc = interpret_macio_props;
else if (!strcmp(np->type, "isa"))
ifunc = interpret_isa_props;
else if (!strcmp(np->name, "uni-n") || !strcmp(np->name, "u3"))
ifunc = interpret_root_props;
else if (!((ifunc == interpret_dbdma_props
|| ifunc == interpret_macio_props)
&& (!strcmp(np->type, "escc")
|| !strcmp(np->type, "media-bay"))))
ifunc = NULL;
/* if we were booted from BootX, convert the full name */
if (boot_infos
&& strncmp(np->full_name, "Devices:device-tree", 19) == 0) {
if (np->full_name[19] == 0) {
strcpy(np->full_name, "/");
} else if (np->full_name[19] == ':') {
char *p = np->full_name + 19;
np->full_name = p;
for (; *p; ++p)
if (*p == ':')
*p = '/';
}
}
for (child = np->child; child != NULL; child = child->sibling)
mem_start = finish_node(child, mem_start, ifunc,
naddrc, nsizec);
return mem_start;
}
/*
* Find the interrupt parent of a node.
*/
static struct device_node * __init
intr_parent(struct device_node *p)
{
phandle *parp;
parp = (phandle *) get_property(p, "interrupt-parent", NULL);
if (parp == NULL)
return p->parent;
p = find_phandle(*parp);
if (p != NULL)
return p;
/*
* On a powermac booted with BootX, we don't get to know the
* phandles for any nodes, so find_phandle will return NULL.
* Fortunately these machines only have one interrupt controller
* so there isn't in fact any ambiguity. -- paulus
*/
if (num_interrupt_controllers == 1)
p = dflt_interrupt_controller;
return p;
}
/*
* Find out the size of each entry of the interrupts property
* for a node.
*/
static int __init
prom_n_intr_cells(struct device_node *np)
{
struct device_node *p;
unsigned int *icp;
for (p = np; (p = intr_parent(p)) != NULL; ) {
icp = (unsigned int *)
get_property(p, "#interrupt-cells", NULL);
if (icp != NULL)
return *icp;
if (get_property(p, "interrupt-controller", NULL) != NULL
|| get_property(p, "interrupt-map", NULL) != NULL) {
printk("oops, node %s doesn't have #interrupt-cells\n",
p->full_name);
return 1;
}
}
printk("prom_n_intr_cells failed for %s\n", np->full_name);
return 1;
}
/*
* Map an interrupt from a device up to the platform interrupt
* descriptor.
*/
static int __init
map_interrupt(unsigned int **irq, struct device_node **ictrler,
struct device_node *np, unsigned int *ints, int nintrc)
{
struct device_node *p, *ipar;
unsigned int *imap, *imask, *ip;
int i, imaplen, match;
int newintrc = 1, newaddrc = 1;
unsigned int *reg;
int naddrc;
reg = (unsigned int *) get_property(np, "reg", NULL);
naddrc = prom_n_addr_cells(np);
p = intr_parent(np);
while (p != NULL) {
if (get_property(p, "interrupt-controller", NULL) != NULL)
/* this node is an interrupt controller, stop here */
break;
imap = (unsigned int *)
get_property(p, "interrupt-map", &imaplen);
if (imap == NULL) {
p = intr_parent(p);
continue;
}
imask = (unsigned int *)
get_property(p, "interrupt-map-mask", NULL);
if (imask == NULL) {
printk("oops, %s has interrupt-map but no mask\n",
p->full_name);
return 0;
}
imaplen /= sizeof(unsigned int);
match = 0;
ipar = NULL;
while (imaplen > 0 && !match) {
/* check the child-interrupt field */
match = 1;
for (i = 0; i < naddrc && match; ++i)
match = ((reg[i] ^ imap[i]) & imask[i]) == 0;
for (; i < naddrc + nintrc && match; ++i)
match = ((ints[i-naddrc] ^ imap[i]) & imask[i]) == 0;
imap += naddrc + nintrc;
imaplen -= naddrc + nintrc;
/* grab the interrupt parent */
ipar = find_phandle((phandle) *imap++);
--imaplen;
if (ipar == NULL && num_interrupt_controllers == 1)
/* cope with BootX not giving us phandles */
ipar = dflt_interrupt_controller;
if (ipar == NULL) {
printk("oops, no int parent %x in map of %s\n",
imap[-1], p->full_name);
return 0;
}
/* find the parent's # addr and intr cells */
ip = (unsigned int *)
get_property(ipar, "#interrupt-cells", NULL);
if (ip == NULL) {
printk("oops, no #interrupt-cells on %s\n",
ipar->full_name);
return 0;
}
newintrc = *ip;
ip = (unsigned int *)
get_property(ipar, "#address-cells", NULL);
newaddrc = (ip == NULL)? 0: *ip;
imap += newaddrc + newintrc;
imaplen -= newaddrc + newintrc;
}
if (imaplen < 0) {
printk("oops, error decoding int-map on %s, len=%d\n",
p->full_name, imaplen);
return 0;
}
if (!match) {
printk("oops, no match in %s int-map for %s\n",
p->full_name, np->full_name);
return 0;
}
p = ipar;
naddrc = newaddrc;
nintrc = newintrc;
ints = imap - nintrc;
reg = ints - naddrc;
}
if (p == NULL)
printk("hmmm, int tree for %s doesn't have ctrler\n",
np->full_name);
*irq = ints;
*ictrler = p;
return nintrc;
}
/*
* New version of finish_node_interrupts.
*/
static unsigned long __init
finish_node_interrupts(struct device_node *np, unsigned long mem_start)
{
unsigned int *ints;
int intlen, intrcells;
int i, j, n, offset;
unsigned int *irq;
struct device_node *ic;
ints = (unsigned int *) get_property(np, "interrupts", &intlen);
if (ints == NULL)
return mem_start;
intrcells = prom_n_intr_cells(np);
intlen /= intrcells * sizeof(unsigned int);
np->n_intrs = intlen;
np->intrs = (struct interrupt_info *) mem_start;
mem_start += intlen * sizeof(struct interrupt_info);
for (i = 0; i < intlen; ++i) {
np->intrs[i].line = 0;
np->intrs[i].sense = 1;
n = map_interrupt(&irq, &ic, np, ints, intrcells);
if (n <= 0)
continue;
offset = 0;
/*
* On a CHRP we have an 8259 which is subordinate to
* the openpic in the interrupt tree, but we want the
* openpic's interrupt numbers offsetted, not the 8259's.
* So we apply the offset if the controller is at the
* root of the interrupt tree, i.e. has no interrupt-parent.
* This doesn't cope with the general case of multiple
* cascaded interrupt controllers, but then neither will
* irq.c at the moment either. -- paulus
* The G5 triggers that code, I add a machine test. On
* those machines, we want to offset interrupts from the
* second openpic by 128 -- BenH
*/
if (_machine != _MACH_Pmac && num_interrupt_controllers > 1
&& ic != NULL
&& get_property(ic, "interrupt-parent", NULL) == NULL)
offset = 16;
else if (_machine == _MACH_Pmac && num_interrupt_controllers > 1
&& ic != NULL && ic->parent != NULL) {
char *name = get_property(ic->parent, "name", NULL);
if (name && !strcmp(name, "u3"))
offset = 128;
}
np->intrs[i].line = irq[0] + offset;
if (n > 1)
np->intrs[i].sense = irq[1];
if (n > 2) {
printk("hmmm, got %d intr cells for %s:", n,
np->full_name);
for (j = 0; j < n; ++j)
printk(" %d", irq[j]);
printk("\n");
}
ints += intrcells;
}
return mem_start;
}
/*
* When BootX makes a copy of the device tree from the MacOS
* Name Registry, it is in the format we use but all of the pointers
* are offsets from the start of the tree.
* This procedure updates the pointers.
*/
void __init
relocate_nodes(void)
{
unsigned long base;
struct device_node *np;
struct property *pp;
#define ADDBASE(x) (x = (typeof (x))((x)? ((unsigned long)(x) + base): 0))
base = (unsigned long) boot_infos + boot_infos->deviceTreeOffset;
allnodes = (struct device_node *)(base + 4);
for (np = allnodes; np != 0; np = np->allnext) {
ADDBASE(np->full_name);
ADDBASE(np->properties);
ADDBASE(np->parent);
ADDBASE(np->child);
ADDBASE(np->sibling);
ADDBASE(np->allnext);
for (pp = np->properties; pp != 0; pp = pp->next) {
ADDBASE(pp->name);
ADDBASE(pp->value);
ADDBASE(pp->next);
}
}
}
int
prom_n_addr_cells(struct device_node* np)
{
int* ip;
do {
if (np->parent)
np = np->parent;
ip = (int *) get_property(np, "#address-cells", NULL);
if (ip != NULL)
return *ip;
} while (np->parent);
/* No #address-cells property for the root node, default to 1 */
return 1;
}
int
prom_n_size_cells(struct device_node* np)
{
int* ip;
do {
if (np->parent)
np = np->parent;
ip = (int *) get_property(np, "#size-cells", NULL);
if (ip != NULL)
return *ip;
} while (np->parent);
/* No #size-cells property for the root node, default to 1 */
return 1;
}
static unsigned long __init
map_addr(struct device_node *np, unsigned long space, unsigned long addr)
{
int na;
unsigned int *ranges;
int rlen = 0;
unsigned int type;
type = (space >> 24) & 3;
if (type == 0)
return addr;
while ((np = np->parent) != NULL) {
if (strcmp(np->type, "pci") != 0)
continue;
/* PCI bridge: map the address through the ranges property */
na = prom_n_addr_cells(np);
ranges = (unsigned int *) get_property(np, "ranges", &rlen);
while ((rlen -= (na + 5) * sizeof(unsigned int)) >= 0) {
if (((ranges[0] >> 24) & 3) == type
&& ranges[2] <= addr
&& addr - ranges[2] < ranges[na+4]) {
/* ok, this matches, translate it */
addr += ranges[na+2] - ranges[2];
break;
}
ranges += na + 5;
}
}
return addr;
}
static unsigned long __init
interpret_pci_props(struct device_node *np, unsigned long mem_start,
int naddrc, int nsizec)
{
struct address_range *adr;
struct pci_reg_property *pci_addrs;
int i, l, *ip;
pci_addrs = (struct pci_reg_property *)
get_property(np, "assigned-addresses", &l);
if (pci_addrs != 0 && l >= sizeof(struct pci_reg_property)) {
i = 0;
adr = (struct address_range *) mem_start;
while ((l -= sizeof(struct pci_reg_property)) >= 0) {
adr[i].space = pci_addrs[i].addr.a_hi;
adr[i].address = map_addr(np, pci_addrs[i].addr.a_hi,
pci_addrs[i].addr.a_lo);
adr[i].size = pci_addrs[i].size_lo;
++i;
}
np->addrs = adr;
np->n_addrs = i;
mem_start += i * sizeof(struct address_range);
}
if (use_of_interrupt_tree)
return mem_start;
ip = (int *) get_property(np, "AAPL,interrupts", &l);
if (ip == 0 && np->parent)
ip = (int *) get_property(np->parent, "AAPL,interrupts", &l);
if (ip == 0)
ip = (int *) get_property(np, "interrupts", &l);
if (ip != 0) {
np->intrs = (struct interrupt_info *) mem_start;
np->n_intrs = l / sizeof(int);
mem_start += np->n_intrs * sizeof(struct interrupt_info);
for (i = 0; i < np->n_intrs; ++i) {
np->intrs[i].line = *ip++;
np->intrs[i].sense = 1;
}
}
return mem_start;
}
static unsigned long __init
interpret_dbdma_props(struct device_node *np, unsigned long mem_start,
int naddrc, int nsizec)
{
struct reg_property *rp;
struct address_range *adr;
unsigned long base_address;
int i, l, *ip;
struct device_node *db;
base_address = 0;
for (db = np->parent; db != NULL; db = db->parent) {
if (!strcmp(db->type, "dbdma") && db->n_addrs != 0) {
base_address = db->addrs[0].address;
break;
}
}
rp = (struct reg_property *) get_property(np, "reg", &l);
if (rp != 0 && l >= sizeof(struct reg_property)) {
i = 0;
adr = (struct address_range *) mem_start;
while ((l -= sizeof(struct reg_property)) >= 0) {
adr[i].space = 2;
adr[i].address = rp[i].address + base_address;
adr[i].size = rp[i].size;
++i;
}
np->addrs = adr;
np->n_addrs = i;
mem_start += i * sizeof(struct address_range);
}
if (use_of_interrupt_tree)
return mem_start;
ip = (int *) get_property(np, "AAPL,interrupts", &l);
if (ip == 0)
ip = (int *) get_property(np, "interrupts", &l);
if (ip != 0) {
np->intrs = (struct interrupt_info *) mem_start;
np->n_intrs = l / sizeof(int);
mem_start += np->n_intrs * sizeof(struct interrupt_info);
for (i = 0; i < np->n_intrs; ++i) {
np->intrs[i].line = *ip++;
np->intrs[i].sense = 1;
}
}
return mem_start;
}
static unsigned long __init
interpret_macio_props(struct device_node *np, unsigned long mem_start,
int naddrc, int nsizec)
{
struct reg_property *rp;
struct address_range *adr;
unsigned long base_address;
int i, l, *ip;
struct device_node *db;
base_address = 0;
for (db = np->parent; db != NULL; db = db->parent) {
if (!strcmp(db->type, "mac-io") && db->n_addrs != 0) {
base_address = db->addrs[0].address;
break;
}
}
rp = (struct reg_property *) get_property(np, "reg", &l);
if (rp != 0 && l >= sizeof(struct reg_property)) {
i = 0;
adr = (struct address_range *) mem_start;
while ((l -= sizeof(struct reg_property)) >= 0) {
adr[i].space = 2;
adr[i].address = rp[i].address + base_address;
adr[i].size = rp[i].size;
++i;
}
np->addrs = adr;
np->n_addrs = i;
mem_start += i * sizeof(struct address_range);
}
if (use_of_interrupt_tree)
return mem_start;
ip = (int *) get_property(np, "interrupts", &l);
if (ip == 0)
ip = (int *) get_property(np, "AAPL,interrupts", &l);
if (ip != 0) {
np->intrs = (struct interrupt_info *) mem_start;
np->n_intrs = l / sizeof(int);
for (i = 0; i < np->n_intrs; ++i) {
np->intrs[i].line = *ip++;
np->intrs[i].sense = 1;
}
mem_start += np->n_intrs * sizeof(struct interrupt_info);
}
return mem_start;
}
static unsigned long __init
interpret_isa_props(struct device_node *np, unsigned long mem_start,
int naddrc, int nsizec)
{
struct isa_reg_property *rp;
struct address_range *adr;
int i, l, *ip;
rp = (struct isa_reg_property *) get_property(np, "reg", &l);
if (rp != 0 && l >= sizeof(struct isa_reg_property)) {
i = 0;
adr = (struct address_range *) mem_start;
while ((l -= sizeof(struct reg_property)) >= 0) {
adr[i].space = rp[i].space;
adr[i].address = rp[i].address
+ (adr[i].space? 0: _ISA_MEM_BASE);
adr[i].size = rp[i].size;
++i;
}
np->addrs = adr;
np->n_addrs = i;
mem_start += i * sizeof(struct address_range);
}
if (use_of_interrupt_tree)
return mem_start;
ip = (int *) get_property(np, "interrupts", &l);
if (ip != 0) {
np->intrs = (struct interrupt_info *) mem_start;
np->n_intrs = l / (2 * sizeof(int));
mem_start += np->n_intrs * sizeof(struct interrupt_info);
for (i = 0; i < np->n_intrs; ++i) {
np->intrs[i].line = *ip++;
np->intrs[i].sense = *ip++;
}
}
return mem_start;
}
static unsigned long __init
interpret_root_props(struct device_node *np, unsigned long mem_start,
int naddrc, int nsizec)
{
struct address_range *adr;
int i, l, *ip;
unsigned int *rp;
int rpsize = (naddrc + nsizec) * sizeof(unsigned int);
rp = (unsigned int *) get_property(np, "reg", &l);
if (rp != 0 && l >= rpsize) {
i = 0;
adr = (struct address_range *) mem_start;
while ((l -= rpsize) >= 0) {
adr[i].space = (naddrc >= 2? rp[naddrc-2]: 2);
adr[i].address = rp[naddrc - 1];
adr[i].size = rp[naddrc + nsizec - 1];
++i;
rp += naddrc + nsizec;
}
np->addrs = adr;
np->n_addrs = i;
mem_start += i * sizeof(struct address_range);
}
if (use_of_interrupt_tree)
return mem_start;
ip = (int *) get_property(np, "AAPL,interrupts", &l);
if (ip == 0)
ip = (int *) get_property(np, "interrupts", &l);
if (ip != 0) {
np->intrs = (struct interrupt_info *) mem_start;
np->n_intrs = l / sizeof(int);
mem_start += np->n_intrs * sizeof(struct interrupt_info);
for (i = 0; i < np->n_intrs; ++i) {
np->intrs[i].line = *ip++;
np->intrs[i].sense = 1;
}
}
return mem_start;
}
/*
* Work out the sense (active-low level / active-high edge)
* of each interrupt from the device tree.
*/
void __init
prom_get_irq_senses(unsigned char *senses, int off, int max)
{
struct device_node *np;
int i, j;
/* default to level-triggered */
memset(senses, 1, max - off);
if (!use_of_interrupt_tree)
return;
for (np = allnodes; np != 0; np = np->allnext) {
for (j = 0; j < np->n_intrs; j++) {
i = np->intrs[j].line;
if (i >= off && i < max) {
if (np->intrs[j].sense == 1)
senses[i-off] = (IRQ_SENSE_LEVEL
| IRQ_POLARITY_NEGATIVE);
else
senses[i-off] = (IRQ_SENSE_EDGE
| IRQ_POLARITY_POSITIVE);
}
}
}
}
/*
* Construct and return a list of the device_nodes with a given name.
*/
struct device_node *
find_devices(const char *name)
{
struct device_node *head, **prevp, *np;
prevp = &head;
for (np = allnodes; np != 0; np = np->allnext) {
if (np->name != 0 && strcasecmp(np->name, name) == 0) {
*prevp = np;
prevp = &np->next;
}
}
*prevp = NULL;
return head;
}
/*
* Construct and return a list of the device_nodes with a given type.
*/
struct device_node *
find_type_devices(const char *type)
{
struct device_node *head, **prevp, *np;
prevp = &head;
for (np = allnodes; np != 0; np = np->allnext) {
if (np->type != 0 && strcasecmp(np->type, type) == 0) {
*prevp = np;
prevp = &np->next;
}
}
*prevp = NULL;
return head;
}
/*
* Returns all nodes linked together
*/
struct device_node * __openfirmware
find_all_nodes(void)
{
struct device_node *head, **prevp, *np;
prevp = &head;
for (np = allnodes; np != 0; np = np->allnext) {
*prevp = np;
prevp = &np->next;
}
*prevp = NULL;
return head;
}
/* Checks if the given "compat" string matches one of the strings in
* the device's "compatible" property
*/
int
device_is_compatible(struct device_node *device, const char *compat)
{
const char* cp;
int cplen, l;
cp = (char *) get_property(device, "compatible", &cplen);
if (cp == NULL)
return 0;
while (cplen > 0) {
if (strncasecmp(cp, compat, strlen(compat)) == 0)
return 1;
l = strlen(cp) + 1;
cp += l;
cplen -= l;
}
return 0;
}
/*
* Indicates whether the root node has a given value in its
* compatible property.
*/
int
machine_is_compatible(const char *compat)
{
struct device_node *root;
root = find_path_device("/");
if (root == 0)
return 0;
return device_is_compatible(root, compat);
}
/*
* Construct and return a list of the device_nodes with a given type
* and compatible property.
*/
struct device_node *
find_compatible_devices(const char *type, const char *compat)
{
struct device_node *head, **prevp, *np;
prevp = &head;
for (np = allnodes; np != 0; np = np->allnext) {
if (type != NULL
&& !(np->type != 0 && strcasecmp(np->type, type) == 0))
continue;
if (device_is_compatible(np, compat)) {
*prevp = np;
prevp = &np->next;
}
}
*prevp = NULL;
return head;
}
/*
* Find the device_node with a given full_name.
*/
struct device_node *
find_path_device(const char *path)
{
struct device_node *np;
for (np = allnodes; np != 0; np = np->allnext)
if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0)
return np;
return NULL;
}
/*******
*
* New implementation of the OF "find" APIs, return a refcounted
* object, call of_node_put() when done. Currently, still lacks
* locking as old implementation, this is beeing done for ppc64.
*
* Note that property management will need some locking as well,
* this isn't dealt with yet
*
*******/
/**
* of_find_node_by_name - Find a node by it's "name" property
* @from: The node to start searching from or NULL, the node
* you pass will not be searched, only the next one
* will; typically, you pass what the previous call
* returned. of_node_put() will be called on it
* @name: The name string to match against
*
* Returns a node pointer with refcount incremented, use
* of_node_put() on it when done.
*/
struct device_node *of_find_node_by_name(struct device_node *from,
const char *name)
{
struct device_node *np = from ? from->allnext : allnodes;
for (; np != 0; np = np->allnext)
if (np->name != 0 && strcasecmp(np->name, name) == 0)
break;
if (from)
of_node_put(from);
return of_node_get(np);
}
/**
* of_find_node_by_type - Find a node by it's "device_type" property
* @from: The node to start searching from or NULL, the node
* you pass will not be searched, only the next one
* will; typically, you pass what the previous call
* returned. of_node_put() will be called on it
* @name: The type string to match against
*
* Returns a node pointer with refcount incremented, use
* of_node_put() on it when done.
*/