Contributors: 15
Author Tokens Token Proportion Commits Commit Proportion
David S. Miller 2470 89.98% 29 46.77%
Rob Herring 170 6.19% 4 6.45%
Linus Torvalds 33 1.20% 3 4.84%
Linus Torvalds (pre-git) 30 1.09% 13 20.97%
Sam Ravnborg 11 0.40% 2 3.23%
Benjamin Herrenschmidt 9 0.33% 1 1.61%
Mike Rapoport 5 0.18% 1 1.61%
Rusty Russell 4 0.15% 1 1.61%
Andres Salomon 3 0.11% 1 1.61%
Akinobu Mita 2 0.07% 1 1.61%
Thomas Gleixner 2 0.07% 1 1.61%
Paul Mackerras 2 0.07% 1 1.61%
Stephen Rothwell 2 0.07% 2 3.23%
Sudeep Holla 1 0.04% 1 1.61%
Pavel Tatashin 1 0.04% 1 1.61%
Total 2745 62 


// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * 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
 */

#include <linux/memblock.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/cpu.h>
#include <linux/mm.h>
#include <linux/of.h>

#include <asm/prom.h>
#include <asm/oplib.h>
#include <asm/irq.h>
#include <asm/asi.h>
#include <asm/upa.h>
#include <asm/smp.h>

#include "prom.h"

void * __init prom_early_alloc(unsigned long size)
{
	void *ret = memblock_alloc(size, SMP_CACHE_BYTES);

	if (!ret) {
		prom_printf("prom_early_alloc(%lu) failed\n", size);
		prom_halt();
	}

	prom_early_allocated += size;

	return ret;
}

/* 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)
{
	const char *name = of_get_property(dp, "name", NULL);
	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 (!of_node_is_root(dp->parent)) {
		sprintf(tmp_buf, "%s@%x,%x",
			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",
				name, prefix,
				high_bits, low_bits);
		else
			sprintf(tmp_buf, "%s@%s%x",
				name,
				prefix,
				high_bits);
	} else if (type == 12) {
		sprintf(tmp_buf, "%s@%x",
			name, high_bits);
	}
}

static void __init sun4u_path_component(struct device_node *dp, char *tmp_buf)
{
	const char *name = of_get_property(dp, "name", NULL);
	struct linux_prom64_registers *regs;
	struct property *prop;

	prop = of_find_property(dp, "reg", NULL);
	if (!prop)
		return;

	regs = prop->value;
	if (!of_node_is_root(dp->parent)) {
		sprintf(tmp_buf, "%s@%x,%x",
			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",
			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)
{
	const char *name = of_get_property(dp, "name", NULL);
	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",
		name,
		regs->which_io,
		regs->phys_addr);
}

/* "name@devnum[,func]" */
static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
{
	const char *name = of_get_property(dp, "name", NULL);
	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",
			name,
			devfn >> 3,
			devfn & 0x07);
	} else {
		sprintf(tmp_buf, "%s@%x",
			name,
			devfn >> 3);
	}
}

/* "name@UPA_PORTID,offset" */
static void __init upa_path_component(struct device_node *dp, char *tmp_buf)
{
	const char *name = of_get_property(dp, "name", NULL);
	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",
		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)
{
	const char *name = of_get_property(dp, "name", NULL);
	struct property *prop;
	u32 *regs;

	prop = of_find_property(dp, "reg", NULL);
	if (!prop)
		return;

	regs = prop->value;

	sprintf(tmp_buf, "%s@%x", name, *regs);
}

/* "name@addrhi,addrlo" */
static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
{
	const char *name = of_get_property(dp, "name", NULL);
	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",
		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)
{
	const char *name = of_get_property(dp, "name", NULL);
	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",
		name, regs[0], regs[1]);
}

/* "name@reg0[,reg1]" */
static void __init usb_path_component(struct device_node *dp, char *tmp_buf)
{
	const char *name = of_get_property(dp, "name", NULL);
	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",
			name, regs[0]);
	} else {
		sprintf(tmp_buf, "%s@%x,%x",
			name, regs[0], regs[1]);
	}
}

/* "name@reg0reg1[,reg2reg3]" */
static void __init ieee1394_path_component(struct device_node *dp, char *tmp_buf)
{
	const char *name = of_get_property(dp, "name", NULL);
	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",
			name, regs[0], regs[1], regs[2], regs[3]);
	} else {
		sprintf(tmp_buf, "%s@%08x%08x",
			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 (of_node_is_type(parent, "pci") ||
		    of_node_is_type(parent, "pciex")) {
			pci_path_component(dp, tmp_buf);
			return;
		}
		if (of_node_is_type(parent, "sbus")) {
			sbus_path_component(dp, tmp_buf);
			return;
		}
		if (of_node_is_type(parent, "upa")) {
			upa_path_component(dp, tmp_buf);
			return;
		}
		if (of_node_is_type(parent, "ebus")) {
			ebus_path_component(dp, tmp_buf);
			return;
		}
		if (of_node_name_eq(parent, "usb") ||
		    of_node_name_eq(parent, "hub")) {
			usb_path_component(dp, tmp_buf);
			return;
		}
		if (of_node_is_type(parent, "i2c")) {
			i2c_path_component(dp, tmp_buf);
			return;
		}
		if (of_node_is_type(parent, "firewire")) {
			ieee1394_path_component(dp, tmp_buf);
			return;
		}
		if (of_node_is_type(parent, "virtual-devices")) {
			vdev_path_component(dp, tmp_buf);
			return;
		}
		/* "isa" is handled with platform naming */
	}

	/* Use platform naming convention.  */
	if (tlb_type == hypervisor) {
		sun4v_path_component(dp, tmp_buf);
		return;
	} else {
		sun4u_path_component(dp, tmp_buf);
	}
}

char * __init build_path_component(struct device_node *dp)
{
	const char *name = of_get_property(dp, "name", NULL);
	char tmp_buf[64], *n;

	tmp_buf[0] = '\0';
	__build_path_component(dp, tmp_buf);
	if (tmp_buf[0] == '\0')
		strcpy(tmp_buf, name);

	n = prom_early_alloc(strlen(tmp_buf) + 1);
	strcpy(n, tmp_buf);

	return n;
}

static const char *get_mid_prop(void)
{
	return (tlb_type == spitfire ? "upa-portid" : "portid");
}

bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
				       int cpu, unsigned int *thread)
{
	const char *mid_prop = get_mid_prop();
	int this_cpu_id;

	/* On hypervisor based platforms we interrogate the 'reg'
	 * property.  On everything else we look for a 'upa-portid',
	 * 'portid', or 'cpuid' property.
	 */

	if (tlb_type == hypervisor) {
		struct property *prop = of_find_property(cpun, "reg", NULL);
		u32 *regs;

		if (!prop) {
			pr_warn("CPU node missing reg property\n");
			return false;
		}
		regs = prop->value;
		this_cpu_id = regs[0] & 0x0fffffff;
	} else {
		this_cpu_id = of_getintprop_default(cpun, mid_prop, -1);

		if (this_cpu_id < 0) {
			mid_prop = "cpuid";
			this_cpu_id = of_getintprop_default(cpun, mid_prop, -1);
		}
		if (this_cpu_id < 0) {
			pr_warn("CPU node missing cpu ID property\n");
			return false;
		}
	}
	if (this_cpu_id == cpu) {
		if (thread) {
			int proc_id = cpu_data(cpu).proc_id;

			/* On sparc64, the cpu thread information is obtained
			 * either from OBP or the machine description.  We've
			 * actually probed this information already long before
			 * this interface gets called so instead of interrogating
			 * both the OF node and the MDESC again, just use what
			 * we discovered already.
			 */
			if (proc_id < 0)
				proc_id = 0;
			*thread = proc_id;
		}
		return true;
	}
	return false;
}

static void *of_iterate_over_cpus(void *(*func)(struct device_node *, int, int), int arg)
{
	struct device_node *dp;
	const char *mid_prop;

	mid_prop = get_mid_prop();
	for_each_node_by_type(dp, "cpu") {
		int cpuid = of_getintprop_default(dp, mid_prop, -1);
		const char *this_mid_prop = mid_prop;
		void *ret;

		if (cpuid < 0) {
			this_mid_prop = "cpuid";
			cpuid = of_getintprop_default(dp, this_mid_prop, -1);
		}
		if (cpuid < 0) {
			prom_printf("OF: Serious problem, cpu lacks "
				    "%s property", this_mid_prop);
			prom_halt();
		}
#ifdef CONFIG_SMP
		if (cpuid >= NR_CPUS) {
			printk(KERN_WARNING "Ignoring CPU %d which is "
			       ">= NR_CPUS (%d)\n",
			       cpuid, NR_CPUS);
			continue;
		}
#endif
		ret = func(dp, cpuid, arg);
		if (ret)
			return ret;
	}
	return NULL;
}

static void *check_cpu_node(struct device_node *dp, int cpuid, int id)
{
	if (id == cpuid)
		return dp;
	return NULL;
}

struct device_node *of_find_node_by_cpuid(int cpuid)
{
	return of_iterate_over_cpus(check_cpu_node, cpuid);
}

static void *record_one_cpu(struct device_node *dp, int cpuid, int arg)
{
	ncpus_probed++;
#ifdef CONFIG_SMP
	set_cpu_present(cpuid, true);

	if (num_possible_cpus() < nr_cpu_ids)
		set_cpu_possible(cpuid, true);
#endif
	return NULL;
}

void __init of_populate_present_mask(void)
{
	if (tlb_type == hypervisor)
		return;

	ncpus_probed = 0;
	of_iterate_over_cpus(record_one_cpu, 0);
}

static void *fill_in_one_cpu(struct device_node *dp, int cpuid, int arg)
{
	struct device_node *portid_parent = NULL;
	int portid = -1;

	if (of_property_present(dp, "cpuid")) {
		int limit = 2;

		portid_parent = dp;
		while (limit--) {
			portid_parent = portid_parent->parent;
			if (!portid_parent)
				break;
			portid = of_getintprop_default(portid_parent,
						       "portid", -1);
			if (portid >= 0)
				break;
		}
	}

#ifndef CONFIG_SMP
	/* On uniprocessor we only want the values for the
	 * real physical cpu the kernel booted onto, however
	 * cpu_data() only has one entry at index 0.
	 */
	if (cpuid != real_hard_smp_processor_id())
		return NULL;
	cpuid = 0;
#endif

	cpu_data(cpuid).clock_tick =
		of_getintprop_default(dp, "clock-frequency", 0);

	if (portid_parent) {
		cpu_data(cpuid).dcache_size =
			of_getintprop_default(dp, "l1-dcache-size",
					      16 * 1024);
		cpu_data(cpuid).dcache_line_size =
			of_getintprop_default(dp, "l1-dcache-line-size",
					      32);
		cpu_data(cpuid).icache_size =
			of_getintprop_default(dp, "l1-icache-size",
					      8 * 1024);
		cpu_data(cpuid).icache_line_size =
			of_getintprop_default(dp, "l1-icache-line-size",
					      32);
		cpu_data(cpuid).ecache_size =
			of_getintprop_default(dp, "l2-cache-size", 0);
		cpu_data(cpuid).ecache_line_size =
			of_getintprop_default(dp, "l2-cache-line-size", 0);
		if (!cpu_data(cpuid).ecache_size ||
		    !cpu_data(cpuid).ecache_line_size) {
			cpu_data(cpuid).ecache_size =
				of_getintprop_default(portid_parent,
						      "l2-cache-size",
						      (4 * 1024 * 1024));
			cpu_data(cpuid).ecache_line_size =
				of_getintprop_default(portid_parent,
						      "l2-cache-line-size", 64);
		}

		cpu_data(cpuid).core_id = portid + 1;
		cpu_data(cpuid).proc_id = portid;
	} else {
		cpu_data(cpuid).dcache_size =
			of_getintprop_default(dp, "dcache-size", 16 * 1024);
		cpu_data(cpuid).dcache_line_size =
			of_getintprop_default(dp, "dcache-line-size", 32);

		cpu_data(cpuid).icache_size =
			of_getintprop_default(dp, "icache-size", 16 * 1024);
		cpu_data(cpuid).icache_line_size =
			of_getintprop_default(dp, "icache-line-size", 32);

		cpu_data(cpuid).ecache_size =
			of_getintprop_default(dp, "ecache-size",
					      (4 * 1024 * 1024));
		cpu_data(cpuid).ecache_line_size =
			of_getintprop_default(dp, "ecache-line-size", 64);

		cpu_data(cpuid).core_id = 0;
		cpu_data(cpuid).proc_id = -1;
	}

	return NULL;
}

void __init of_fill_in_cpu_data(void)
{
	if (tlb_type == hypervisor)
		return;

	of_iterate_over_cpus(fill_in_one_cpu, 0);

	smp_fill_in_sib_core_maps();
}

void __init of_console_init(void)
{
	char *msg = "OF stdout device is: %s\n";
	struct device_node *dp;
	phandle node;

	of_console_path = prom_early_alloc(256);
	if (prom_ihandle2path(prom_stdout, of_console_path, 256) < 0) {
		prom_printf("Cannot obtain path of stdout.\n");
		prom_halt();
	}
	of_console_options = strrchr(of_console_path, ':');
	if (of_console_options) {
		of_console_options++;
		if (*of_console_options == '\0')
			of_console_options = NULL;
	}

	node = prom_inst2pkg(prom_stdout);
	if (!node) {
		prom_printf("Cannot resolve stdout node from "
			    "instance %08x.\n", prom_stdout);
		prom_halt();
	}

	dp = of_find_node_by_phandle(node);

	if (!of_node_is_type(dp, "display") && !of_node_is_type(dp, "serial")) {
		prom_printf("Console device_type is neither display "
			    "nor serial.\n");
		prom_halt();
	}

	of_console_device = dp;

	printk(msg, of_console_path);
}