prom.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:29k
- /*
- * BK Id: %F% %I% %G% %U% %#%
- */
- /*
- * 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 <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/pci.h>
- #include <linux/slab.h>
- #include <asm/sections.h>
- #include <asm/prom.h>
- #include <asm/page.h>
- #include <asm/processor.h>
- #include <asm/irq.h>
- #include <asm/open_pic.h>
- #include <asm/system.h>
- #include <asm/btext.h>
- #include <asm/pci-bridge.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);
- 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", 0)) {
- 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 machinen");
- prom_print(" You should use an Open Firmware bootloadern");
- }
- #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", 0);
- np->type = get_property(np, "device_type", 0);
- 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", 0);
- if (ip != NULL)
- naddrc = *ip;
- ip = (int *) get_property(np, "#size-cells", 0);
- 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"))
- 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-cellsn",
- p->full_name);
- return 1;
- }
- }
- printk("prom_n_intr_cells failed for %sn", 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, newaddrc;
- 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 maskn",
- 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 %sn",
- 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 %sn",
- 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=%dn",
- p->full_name, imaplen);
- return 0;
- }
- if (!match) {
- printk("oops, no match in %s int-map for %sn",
- 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 ctrlern",
- 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
- */
- if (num_interrupt_controllers > 1 && ic != NULL
- && get_property(ic, "interrupt-parent", NULL) == NULL)
- offset = 16;
- 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 = (x)? ((typeof (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", 0);
- 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", 0);
- 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
- 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) {
- /* XXX assumes PCI addresses mapped 1-1 to physical */
- adr[i].space = pci_addrs[i].addr.a_hi;
- adr[i].address = 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)
- senses[i-off] = np->intrs[j].sense;
- }
- }
- }
- /*
- * 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 = 0;
- 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 = 0;
- 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 = 0;
- 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 = 0;
- 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;
- }
- /*
- * Find the device_node with a given phandle.
- */
- struct device_node * __init
- find_phandle(phandle ph)
- {
- struct device_node *np;
- for (np = allnodes; np != 0; np = np->allnext)
- if (np->node == ph)
- return np;
- return NULL;
- }
- /*
- * Find a property with a given name for a given node
- * and return the value.
- */
- unsigned char *
- get_property(struct device_node *np, const char *name, int *lenp)
- {
- struct property *pp;
- for (pp = np->properties; pp != 0; pp = pp->next)
- if (pp->name != NULL && strcmp(pp->name, name) == 0) {
- if (lenp != 0)
- *lenp = pp->length;
- return pp->value;
- }
- return 0;
- }
- /*
- * Add a property to a node
- */
- void __openfirmware
- prom_add_property(struct device_node* np, struct property* prop)
- {
- struct property **next = &np->properties;
- prop->next = NULL;
- while (*next)
- next = &(*next)->next;
- *next = prop;
- }
- /* I quickly hacked that one, check against spec ! */
- static inline unsigned long __openfirmware
- bus_space_to_resource_flags(unsigned int bus_space)
- {
- u8 space = (bus_space >> 24) & 0xf;
- if (space == 0)
- space = 0x02;
- if (space == 0x02)
- return IORESOURCE_MEM;
- else if (space == 0x01)
- return IORESOURCE_IO;
- else {
- printk(KERN_WARNING "prom.c: bus_space_to_resource_flags(), space: %xn",
- bus_space);
- return 0;
- }
- }
- static struct resource* __openfirmware
- find_parent_pci_resource(struct pci_dev* pdev, struct address_range *range)
- {
- unsigned long mask;
- int i;
-
- /* Check this one */
- mask = bus_space_to_resource_flags(range->space);
- for (i=0; i<DEVICE_COUNT_RESOURCE; i++) {
- if ((pdev->resource[i].flags & mask) == mask &&
- pdev->resource[i].start <= range->address &&
- pdev->resource[i].end > range->address) {
- if ((range->address + range->size - 1) > pdev->resource[i].end) {
- /* Add better message */
- printk(KERN_WARNING "PCI/OF resource overlap !n");
- return NULL;
- }
- break;
- }
- }
- if (i == DEVICE_COUNT_RESOURCE)
- return NULL;
- return &pdev->resource[i];
- }
- /*
- * Request an OF device resource. Currently handles child of PCI devices,
- * or other nodes attached to the root node. Ultimately, put some
- * link to resources in the OF node.
- * WARNING: out_resource->name should be initialized before calling this
- * function.
- */
- struct resource* __openfirmware
- request_OF_resource(struct device_node* node, int index, const char* name_postfix)
- {
- struct pci_dev* pcidev;
- u8 pci_bus, pci_devfn;
- unsigned long iomask;
- struct device_node* nd;
- struct resource* parent;
- struct resource *res = NULL;
- int nlen, plen;
- if (index >= node->n_addrs)
- goto fail;
- /* Sanity check on bus space */
- iomask = bus_space_to_resource_flags(node->addrs[index].space);
- if (iomask & IORESOURCE_MEM)
- parent = &iomem_resource;
- else if (iomask & IORESOURCE_IO)
- parent = &ioport_resource;
- else
- goto fail;
-
- /* Find a PCI parent if any */
- nd = node;
- pcidev = NULL;
- while(nd) {
- if (!pci_device_from_OF_node(nd, &pci_bus, &pci_devfn))
- pcidev = pci_find_slot(pci_bus, pci_devfn);
- if (pcidev) break;
- nd = nd->parent;
- }
- if (pcidev)
- parent = find_parent_pci_resource(pcidev, &node->addrs[index]);
- if (!parent) {
- printk(KERN_WARNING "request_OF_resource(%s), parent not foundn",
- node->name);
- goto fail;
- }
- res = __request_region(parent, node->addrs[index].address, node->addrs[index].size, NULL);
- if (!res)
- goto fail;
- nlen = strlen(node->name);
- plen = name_postfix ? strlen(name_postfix) : 0;
- res->name = (const char *)kmalloc(nlen+plen+1, GFP_KERNEL);
- if (res->name) {
- strcpy((char *)res->name, node->name);
- if (plen)
- strcpy((char *)res->name+nlen, name_postfix);
- }
- return res;
- fail:
- return NULL;
- }
- int __openfirmware
- release_OF_resource(struct device_node* node, int index)
- {
- struct pci_dev* pcidev;
- u8 pci_bus, pci_devfn;
- unsigned long iomask;
- struct device_node* nd;
- struct resource* parent;
- struct resource *res = NULL;
- if (index >= node->n_addrs)
- return -EINVAL;
- /* Sanity check on bus space */
- iomask = bus_space_to_resource_flags(node->addrs[index].space);
- if (iomask & IORESOURCE_MEM)
- parent = &iomem_resource;
- else if (iomask & IORESOURCE_IO)
- parent = &ioport_resource;
- else
- return -EINVAL;
-
- /* Find a PCI parent if any */
- nd = node;
- pcidev = NULL;
- while(nd) {
- if (!pci_device_from_OF_node(nd, &pci_bus, &pci_devfn))
- pcidev = pci_find_slot(pci_bus, pci_devfn);
- if (pcidev) break;
- nd = nd->parent;
- }
- if (pcidev)
- parent = find_parent_pci_resource(pcidev, &node->addrs[index]);
- if (!parent) {
- printk(KERN_WARNING "request_OF_resource(%s), parent not foundn",
- node->name);
- return -ENODEV;
- }
- /* Find us in the parent */
- res = parent->child;
- while (res) {
- if (res->start == node->addrs[index].address &&
- res->end == (res->start + node->addrs[index].size - 1))
- break;
- res = res->sibling;
- }
- if (!res)
- return -ENODEV;
- if (res->name) {
- kfree(res->name);
- res->name = NULL;
- }
- release_resource(res);
- kfree(res);
- return 0;
- }
- #if 0
- void __openfirmware
- print_properties(struct device_node *np)
- {
- struct property *pp;
- char *cp;
- int i, n;
- for (pp = np->properties; pp != 0; pp = pp->next) {
- printk(KERN_INFO "%s", pp->name);
- for (i = strlen(pp->name); i < 16; ++i)
- printk(" ");
- cp = (char *) pp->value;
- for (i = pp->length; i > 0; --i, ++cp)
- if ((i > 1 && (*cp < 0x20 || *cp > 0x7e))
- || (i == 1 && *cp != 0))
- break;
- if (i == 0 && pp->length > 1) {
- /* looks like a string */
- printk(" %sn", (char *) pp->value);
- } else {
- /* dump it in hex */
- n = pp->length;
- if (n > 64)
- n = 64;
- if (pp->length % 4 == 0) {
- unsigned int *p = (unsigned int *) pp->value;
- n /= 4;
- for (i = 0; i < n; ++i) {
- if (i != 0 && (i % 4) == 0)
- printk("n ");
- printk(" %08x", *p++);
- }
- } else {
- unsigned char *bp = pp->value;
- for (i = 0; i < n; ++i) {
- if (i != 0 && (i % 16) == 0)
- printk("n ");
- printk(" %02x", *bp++);
- }
- }
- printk("n");
- if (pp->length > 64)
- printk(" ... (length = %d)n",
- pp->length);
- }
- }
- }
- #endif
- static spinlock_t rtas_lock = SPIN_LOCK_UNLOCKED;
- /* this can be called after setup -- Cort */
- int __openfirmware
- call_rtas(const char *service, int nargs, int nret,
- unsigned long *outputs, ...)
- {
- va_list list;
- int i;
- unsigned long s;
- struct device_node *rtas;
- int *tokp;
- union {
- unsigned long words[16];
- double align;
- } u;
- rtas = find_devices("rtas");
- if (rtas == NULL)
- return -1;
- tokp = (int *) get_property(rtas, service, NULL);
- if (tokp == NULL) {
- printk(KERN_ERR "No RTAS service called %sn", service);
- return -1;
- }
- u.words[0] = *tokp;
- u.words[1] = nargs;
- u.words[2] = nret;
- va_start(list, outputs);
- for (i = 0; i < nargs; ++i)
- u.words[i+3] = va_arg(list, unsigned long);
- va_end(list);
- /*
- * RTAS doesn't use floating point.
- * Or at least, according to the CHRP spec we enter RTAS
- * with FP disabled, and it doesn't change the FP registers.
- * -- paulus.
- */
- spin_lock_irqsave(&rtas_lock, s);
- enter_rtas((void *)__pa(&u));
- spin_unlock_irqrestore(&rtas_lock, s);
- if (nret > 1 && outputs != NULL)
- for (i = 0; i < nret-1; ++i)
- outputs[i] = u.words[i+nargs+4];
- return u.words[nargs+3];
- }