[SPARC64]: Import OBP device tree into kernel data structures.
authorDavid S. Miller <davem@sunset.davemloft.net>
Wed, 21 Jun 2006 22:35:28 +0000 (15:35 -0700)
committerDavid S. Miller <davem@sunset.davemloft.net>
Sat, 24 Jun 2006 06:15:02 +0000 (23:15 -0700)
The basic framework is based on the PowerPC OF code.

This code even tries to get the device addressing components
correct in the full path names.

Signed-off-by: David S. Miller <davem@davemloft.net>
arch/sparc64/kernel/Makefile
arch/sparc64/kernel/prom.c [new file with mode: 0644]
arch/sparc64/mm/init.c
include/asm-sparc64/prom.h [new file with mode: 0644]

index 6f6816488b0429ca3f20ada64dfe85e5ad2db1eb..7f00189ed294a83f7ad68378415d0b58a195e9e6 100644 (file)
@@ -12,7 +12,7 @@ obj-y         := process.o setup.o cpu.o idprom.o \
                   irq.o ptrace.o time.o sys_sparc.o signal.o \
                   unaligned.o central.o pci.o starfire.o semaphore.o \
                   power.o sbus.o iommu_common.o sparc64_ksyms.o chmc.o \
-                  visemul.o
+                  visemul.o prom.o
 
 obj-$(CONFIG_PCI)       += ebus.o isa.o pci_common.o pci_iommu.o \
                            pci_psycho.o pci_sabre.o pci_schizo.o \
diff --git a/arch/sparc64/kernel/prom.c b/arch/sparc64/kernel/prom.c
new file mode 100644 (file)
index 0000000..c99b7aa
--- /dev/null
@@ -0,0 +1,543 @@
+/*
+ * Procedures for creating, accessing and interpreting the device tree.
+ *
+ * Paul Mackerras      August 1996.
+ * Copyright (C) 1996-2005 Paul Mackerras.
+ * 
+ *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
+ *    {engebret|bergner}@us.ibm.com 
+ *
+ *  Adapted for sparc64 by David S. Miller davem@davemloft.net
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+
+#include <asm/prom.h>
+#include <asm/oplib.h>
+
+static struct device_node *allnodes;
+
+struct device_node *of_get_parent(const struct device_node *node)
+{
+       struct device_node *np;
+
+       if (!node)
+               return NULL;
+
+       np = node->parent;
+
+       return np;
+}
+
+struct device_node *of_get_next_child(const struct device_node *node,
+       struct device_node *prev)
+{
+       struct device_node *next;
+
+       next = prev ? prev->sibling : node->child;
+       for (; next != 0; next = next->sibling) {
+               break;
+       }
+
+       return next;
+}
+
+struct device_node *of_find_node_by_path(const char *path)
+{
+       struct device_node *np = allnodes;
+
+       for (; np != 0; np = np->allnext) {
+               if (np->full_name != 0 && strcmp(np->full_name, path) == 0)
+                       break;
+       }
+
+       return np;
+}
+
+struct property *of_find_property(struct device_node *np, const char *name,
+                                 int *lenp)
+{
+       struct property *pp;
+
+       for (pp = np->properties; pp != 0; pp = pp->next) {
+               if (strcmp(pp->name, name) == 0) {
+                       if (lenp != 0)
+                               *lenp = pp->length;
+                       break;
+               }
+       }
+       return pp;
+}
+
+static unsigned int prom_early_allocated;
+
+static void * __init prom_early_alloc(unsigned long size)
+{
+       void *ret;
+
+       ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
+       if (ret != NULL)
+               memset(ret, 0, size);
+
+       prom_early_allocated += size;
+
+       return ret;
+}
+
+static int is_root_node(const struct device_node *dp)
+{
+       if (!dp)
+               return 0;
+
+       return (dp->parent == NULL);
+}
+
+/* The following routines deal with the black magic of fully naming a
+ * node.
+ *
+ * Certain well known named nodes are just the simple name string.
+ *
+ * Actual devices have an address specifier appended to the base name
+ * string, like this "foo@addr".  The "addr" can be in any number of
+ * formats, and the platform plus the type of the node determine the
+ * format and how it is constructed.
+ *
+ * For children of the ROOT node, the naming convention is fixed and
+ * determined by whether this is a sun4u or sun4v system.
+ *
+ * For children of other nodes, it is bus type specific.  So
+ * we walk up the tree until we discover a "device_type" property
+ * we recognize and we go from there.
+ *
+ * As an example, the boot device on my workstation has a full path:
+ *
+ *     /pci@1e,600000/ide@d/disk@0,0:c
+ */
+static void __init sun4v_path_component(struct device_node *dp, char *tmp_buf)
+{
+       struct linux_prom64_registers *regs;
+       struct property *rprop;
+       u32 high_bits, low_bits, type;
+
+       rprop = of_find_property(dp, "reg", NULL);
+       if (!rprop)
+               return;
+
+       regs = rprop->value;
+       if (!is_root_node(dp->parent)) {
+               sprintf(tmp_buf, "%s@%x,%x",
+                       dp->name,
+                       (unsigned int) (regs->phys_addr >> 32UL),
+                       (unsigned int) (regs->phys_addr & 0xffffffffUL));
+               return;
+       }
+
+       type = regs->phys_addr >> 60UL;
+       high_bits = (regs->phys_addr >> 32UL) & 0x0fffffffUL;
+       low_bits = (regs->phys_addr & 0xffffffffUL);
+
+       if (type == 0 || type == 8) {
+               const char *prefix = (type == 0) ? "m" : "i";
+
+               if (low_bits)
+                       sprintf(tmp_buf, "%s@%s%x,%x",
+                               dp->name, prefix,
+                               high_bits, low_bits);
+               else
+                       sprintf(tmp_buf, "%s@%s%x",
+                               dp->name,
+                               prefix,
+                               high_bits);
+       } else if (type == 12) {
+               sprintf(tmp_buf, "%s@%x",
+                       dp->name, high_bits);
+       }
+}
+
+static void __init sun4u_path_component(struct device_node *dp, char *tmp_buf)
+{
+       struct linux_prom64_registers *regs;
+       struct property *prop;
+
+       prop = of_find_property(dp, "reg", NULL);
+       if (!prop)
+               return;
+
+       regs = prop->value;
+       if (!is_root_node(dp->parent)) {
+               sprintf(tmp_buf, "%s@%x,%x",
+                       dp->name,
+                       (unsigned int) (regs->phys_addr >> 32UL),
+                       (unsigned int) (regs->phys_addr & 0xffffffffUL));
+               return;
+       }
+
+       prop = of_find_property(dp, "upa-portid", NULL);
+       if (!prop)
+               prop = of_find_property(dp, "portid", NULL);
+       if (prop) {
+               unsigned long mask = 0xffffffffUL;
+
+               if (tlb_type >= cheetah)
+                       mask = 0x7fffff;
+
+               sprintf(tmp_buf, "%s@%x,%x",
+                       dp->name,
+                       *(u32 *)prop->value,
+                       (unsigned int) (regs->phys_addr & mask));
+       }
+}
+
+/* "name@slot,offset"  */
+static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
+{
+       struct linux_prom_registers *regs;
+       struct property *prop;
+
+       prop = of_find_property(dp, "reg", NULL);
+       if (!prop)
+               return;
+
+       regs = prop->value;
+       sprintf(tmp_buf, "%s@%x,%x",
+               dp->name,
+               regs->which_io,
+               regs->phys_addr);
+}
+
+/* "name@devnum[,func]" */
+static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
+{
+       struct linux_prom_pci_registers *regs;
+       struct property *prop;
+       unsigned int devfn;
+
+       prop = of_find_property(dp, "reg", NULL);
+       if (!prop)
+               return;
+
+       regs = prop->value;
+       devfn = (regs->phys_hi >> 8) & 0xff;
+       if (devfn & 0x07) {
+               sprintf(tmp_buf, "%s@%x,%x",
+                       dp->name,
+                       devfn >> 3,
+                       devfn & 0x07);
+       } else {
+               sprintf(tmp_buf, "%s@%x",
+                       dp->name,
+                       devfn >> 3);
+       }
+}
+
+/* "name@UPA_PORTID,offset" */
+static void __init upa_path_component(struct device_node *dp, char *tmp_buf)
+{
+       struct linux_prom64_registers *regs;
+       struct property *prop;
+
+       prop = of_find_property(dp, "reg", NULL);
+       if (!prop)
+               return;
+
+       regs = prop->value;
+
+       prop = of_find_property(dp, "upa-portid", NULL);
+       if (!prop)
+               return;
+
+       sprintf(tmp_buf, "%s@%x,%x",
+               dp->name,
+               *(u32 *) prop->value,
+               (unsigned int) (regs->phys_addr & 0xffffffffUL));
+}
+
+/* "name@reg" */
+static void __init vdev_path_component(struct device_node *dp, char *tmp_buf)
+{
+       struct property *prop;
+       u32 *regs;
+
+       prop = of_find_property(dp, "reg", NULL);
+       if (!prop)
+               return;
+
+       regs = prop->value;
+
+       sprintf(tmp_buf, "%s@%x", dp->name, *regs);
+}
+
+/* "name@addrhi,addrlo" */
+static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
+{
+       struct linux_prom64_registers *regs;
+       struct property *prop;
+
+       prop = of_find_property(dp, "reg", NULL);
+       if (!prop)
+               return;
+
+       regs = prop->value;
+
+       sprintf(tmp_buf, "%s@%x,%x",
+               dp->name,
+               (unsigned int) (regs->phys_addr >> 32UL),
+               (unsigned int) (regs->phys_addr & 0xffffffffUL));
+}
+
+/* "name@bus,addr" */
+static void __init i2c_path_component(struct device_node *dp, char *tmp_buf)
+{
+       struct property *prop;
+       u32 *regs;
+
+       prop = of_find_property(dp, "reg", NULL);
+       if (!prop)
+               return;
+
+       regs = prop->value;
+
+       /* This actually isn't right... should look at the #address-cells
+        * property of the i2c bus node etc. etc.
+        */
+       sprintf(tmp_buf, "%s@%x,%x",
+               dp->name, regs[0], regs[1]);
+}
+
+/* "name@reg0[,reg1]" */
+static void __init usb_path_component(struct device_node *dp, char *tmp_buf)
+{
+       struct property *prop;
+       u32 *regs;
+
+       prop = of_find_property(dp, "reg", NULL);
+       if (!prop)
+               return;
+
+       regs = prop->value;
+
+       if (prop->length == sizeof(u32) || regs[1] == 1) {
+               sprintf(tmp_buf, "%s@%x",
+                       dp->name, regs[0]);
+       } else {
+               sprintf(tmp_buf, "%s@%x,%x",
+                       dp->name, regs[0], regs[1]);
+       }
+}
+
+/* "name@reg0reg1[,reg2reg3]" */
+static void __init ieee1394_path_component(struct device_node *dp, char *tmp_buf)
+{
+       struct property *prop;
+       u32 *regs;
+
+       prop = of_find_property(dp, "reg", NULL);
+       if (!prop)
+               return;
+
+       regs = prop->value;
+
+       if (regs[2] || regs[3]) {
+               sprintf(tmp_buf, "%s@%08x%08x,%04x%08x",
+                       dp->name, regs[0], regs[1], regs[2], regs[3]);
+       } else {
+               sprintf(tmp_buf, "%s@%08x%08x",
+                       dp->name, regs[0], regs[1]);
+       }
+}
+
+static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
+{
+       struct device_node *parent = dp->parent;
+
+       if (parent != NULL) {
+               if (!strcmp(parent->type, "pci") ||
+                   !strcmp(parent->type, "pciex"))
+                       return pci_path_component(dp, tmp_buf);
+               if (!strcmp(parent->type, "sbus"))
+                       return sbus_path_component(dp, tmp_buf);
+               if (!strcmp(parent->type, "upa"))
+                       return upa_path_component(dp, tmp_buf);
+               if (!strcmp(parent->type, "ebus"))
+                       return ebus_path_component(dp, tmp_buf);
+               if (!strcmp(parent->name, "usb") ||
+                   !strcmp(parent->name, "hub"))
+                       return usb_path_component(dp, tmp_buf);
+               if (!strcmp(parent->type, "i2c"))
+                       return i2c_path_component(dp, tmp_buf);
+               if (!strcmp(parent->type, "firewire"))
+                       return ieee1394_path_component(dp, tmp_buf);
+               if (!strcmp(parent->type, "virtual-devices"))
+                       return vdev_path_component(dp, tmp_buf);
+
+               /* "isa" is handled with platform naming */
+       }
+
+       /* Use platform naming convention.  */
+       if (tlb_type == hypervisor)
+               return sun4v_path_component(dp, tmp_buf);
+       else
+               return sun4u_path_component(dp, tmp_buf);
+}
+
+static char * __init build_path_component(struct device_node *dp)
+{
+       char tmp_buf[64], *n;
+
+       tmp_buf[0] = '\0';
+       __build_path_component(dp, tmp_buf);
+       if (tmp_buf[0] == '\0')
+               strcpy(tmp_buf, dp->name);
+
+       n = prom_early_alloc(strlen(tmp_buf) + 1);
+       strcpy(n, tmp_buf);
+
+       return n;
+}
+
+static char * __init build_full_name(struct device_node *dp)
+{
+       int len, ourlen, plen;
+       char *n;
+
+       plen = strlen(dp->parent->full_name);
+       ourlen = strlen(dp->path_component_name);
+       len = ourlen + plen + 2;
+
+       n = prom_early_alloc(len);
+       strcpy(n, dp->parent->full_name);
+       if (!is_root_node(dp->parent)) {
+               strcpy(n + plen, "/");
+               plen++;
+       }
+       strcpy(n + plen, dp->path_component_name);
+
+       return n;
+}
+
+static struct property * __init build_one_prop(phandle node, char *prev)
+{
+       static struct property *tmp = NULL;
+       struct property *p;
+
+       if (tmp) {
+               p = tmp;
+               memset(p, 0, sizeof(*p) + 32);
+               tmp = NULL;
+       } else
+               p = prom_early_alloc(sizeof(struct property) + 32);
+
+       p->name = (char *) (p + 1);
+       if (prev == NULL) {
+               prom_firstprop(node, p->name);
+       } else {
+               prom_nextprop(node, prev, p->name);
+       }
+       if (strlen(p->name) == 0) {
+               tmp = p;
+               return NULL;
+       }
+       p->length = prom_getproplen(node, p->name);
+       if (p->length <= 0) {
+               p->length = 0;
+       } else {
+               p->value = prom_early_alloc(p->length);
+               prom_getproperty(node, p->name, p->value, p->length);
+       }
+       return p;
+}
+
+static struct property * __init build_prop_list(phandle node)
+{
+       struct property *head, *tail;
+
+       head = tail = build_one_prop(node, NULL);
+       while(tail) {
+               tail->next = build_one_prop(node, tail->name);
+               tail = tail->next;
+       }
+
+       return head;
+}
+
+static char * __init get_one_property(phandle node, const char *name)
+{
+       char *buf = "<NULL>";
+       int len;
+
+       len = prom_getproplen(node, name);
+       if (len > 0) {
+               buf = prom_early_alloc(len);
+               prom_getproperty(node, name, buf, len);
+       }
+
+       return buf;
+}
+
+static struct device_node * __init create_node(phandle node)
+{
+       struct device_node *dp;
+
+       if (!node)
+               return NULL;
+
+       dp = prom_early_alloc(sizeof(*dp));
+
+       kref_init(&dp->kref);
+
+       dp->name = get_one_property(node, "name");
+       dp->type = get_one_property(node, "device_type");
+       dp->node = node;
+
+       /* Build interrupts later... */
+
+       dp->properties = build_prop_list(node);
+
+       return dp;
+}
+
+static struct device_node * __init build_tree(struct device_node *parent, phandle node, struct device_node ***nextp)
+{
+       struct device_node *dp;
+
+       dp = create_node(node);
+       if (dp) {
+               *(*nextp) = dp;
+               *nextp = &dp->allnext;
+
+               dp->parent = parent;
+               dp->path_component_name = build_path_component(dp);
+               dp->full_name = build_full_name(dp);
+
+               dp->child = build_tree(dp, prom_getchild(node), nextp);
+
+               dp->sibling = build_tree(parent, prom_getsibling(node), nextp);
+       }
+
+       return dp;
+}
+
+void __init prom_build_devicetree(void)
+{
+       struct device_node **nextp;
+
+       allnodes = create_node(prom_root_node);
+       allnodes->path_component_name = "";
+       allnodes->full_name = "/";
+
+       nextp = &allnodes->allnext;
+       allnodes->child = build_tree(allnodes,
+                                    prom_getchild(allnodes->node),
+                                    &nextp);
+       printk("PROM: Built device tree with %u bytes of memory.\n",
+              prom_early_allocated);
+}
index 1539a8362b6f564bc3e49d9ba01f94827d012063..45a70d677d8bc25749bb4ab8a0af7a05b8acf66c 100644 (file)
@@ -42,6 +42,7 @@
 #include <asm/sections.h>
 #include <asm/tsb.h>
 #include <asm/hypervisor.h>
+#include <asm/prom.h>
 
 extern void device_scan(void);
 
@@ -1339,6 +1340,8 @@ void __init paging_init(void)
 
        kernel_physical_mapping_init();
 
+       prom_build_devicetree();
+
        {
                unsigned long zones_size[MAX_NR_ZONES];
                unsigned long zholes_size[MAX_NR_ZONES];
diff --git a/include/asm-sparc64/prom.h b/include/asm-sparc64/prom.h
new file mode 100644 (file)
index 0000000..44bcc83
--- /dev/null
@@ -0,0 +1,79 @@
+#ifndef _SPARC64_PROM_H
+#define _SPARC64_PROM_H
+#ifdef __KERNEL__
+
+
+/*
+ * Definitions for talking to the Open Firmware PROM on
+ * Power Macintosh computers.
+ *
+ * Copyright (C) 1996-2005 Paul Mackerras.
+ *
+ * Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
+ * Updates for SPARC64 by David S. Miller
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/types.h>
+#include <linux/proc_fs.h>
+#include <asm/atomic.h>
+
+typedef u32 phandle;
+typedef u32 ihandle;
+
+struct interrupt_info {
+       int     line;
+       int     sense;          /* +ve/-ve logic, edge or level, etc. */
+};
+
+struct property {
+       char    *name;
+       int     length;
+       void    *value;
+       struct property *next;
+};
+
+struct device_node {
+       char    *name;
+       char    *type;
+       phandle node;
+       phandle linux_phandle;
+       int     n_intrs;
+       struct  interrupt_info *intrs;
+       char    *path_component_name;
+       char    *full_name;
+
+       struct  property *properties;
+       struct  property *deadprops; /* removed properties */
+       struct  device_node *parent;
+       struct  device_node *child;
+       struct  device_node *sibling;
+       struct  device_node *next;      /* next device of same type */
+       struct  device_node *allnext;   /* next in list of all nodes */
+       struct  proc_dir_entry *pde;    /* this node's proc directory */
+       struct  kref kref;
+       unsigned long _flags;
+       void    *data;
+};
+
+static inline void set_node_proc_entry(struct device_node *dn, struct proc_dir_entry *de)
+{
+       dn->pde = de;
+}
+
+extern struct device_node *of_find_node_by_path(const char *path);
+extern struct device_node *of_get_parent(const struct device_node *node);
+extern struct device_node *of_get_next_child(const struct device_node *node,
+                                            struct device_node *prev);
+extern struct property *of_find_property(struct device_node *np,
+                                        const char *name,
+                                        int *lenp);
+
+extern void prom_build_devicetree(void);
+
+#endif /* __KERNEL__ */
+#endif /* _SPARC64_PROM_H */