2126 lines
51 KiB
C
2126 lines
51 KiB
C
/*
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* Procedures for creating, accessing and interpreting the device tree.
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*
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* Paul Mackerras August 1996.
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* Copyright (C) 1996-2005 Paul Mackerras.
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*
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* Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
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* {engebret|bergner}@us.ibm.com
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#undef DEBUG
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#include <stdarg.h>
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/threads.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/stringify.h>
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#include <linux/delay.h>
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#include <linux/initrd.h>
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#include <linux/bitops.h>
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#include <linux/module.h>
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#include <asm/prom.h>
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#include <asm/rtas.h>
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#include <asm/lmb.h>
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#include <asm/page.h>
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#include <asm/processor.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#include <asm/smp.h>
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#include <asm/system.h>
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#include <asm/mmu.h>
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#include <asm/pgtable.h>
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#include <asm/pci.h>
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#include <asm/iommu.h>
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#include <asm/btext.h>
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#include <asm/sections.h>
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#include <asm/machdep.h>
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#include <asm/pSeries_reconfig.h>
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#include <asm/pci-bridge.h>
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#ifdef CONFIG_PPC64
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#include <asm/systemcfg.h>
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#endif
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#ifdef DEBUG
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#define DBG(fmt...) printk(KERN_ERR fmt)
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#else
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#define DBG(fmt...)
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#endif
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struct pci_reg_property {
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struct pci_address addr;
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u32 size_hi;
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u32 size_lo;
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};
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struct isa_reg_property {
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u32 space;
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u32 address;
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u32 size;
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};
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typedef int interpret_func(struct device_node *, unsigned long *,
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int, int, int);
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extern struct rtas_t rtas;
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extern struct lmb lmb;
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extern unsigned long klimit;
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static unsigned long memory_limit;
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static int __initdata dt_root_addr_cells;
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static int __initdata dt_root_size_cells;
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#ifdef CONFIG_PPC64
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static int __initdata iommu_is_off;
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int __initdata iommu_force_on;
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extern unsigned long tce_alloc_start, tce_alloc_end;
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#endif
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typedef u32 cell_t;
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#if 0
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static struct boot_param_header *initial_boot_params __initdata;
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#else
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struct boot_param_header *initial_boot_params;
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#endif
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static struct device_node *allnodes = NULL;
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/* use when traversing tree through the allnext, child, sibling,
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* or parent members of struct device_node.
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*/
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static DEFINE_RWLOCK(devtree_lock);
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/* export that to outside world */
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struct device_node *of_chosen;
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struct device_node *dflt_interrupt_controller;
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int num_interrupt_controllers;
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u32 rtas_data;
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u32 rtas_entry;
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/*
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* Wrapper for allocating memory for various data that needs to be
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* attached to device nodes as they are processed at boot or when
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* added to the device tree later (e.g. DLPAR). At boot there is
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* already a region reserved so we just increment *mem_start by size;
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* otherwise we call kmalloc.
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*/
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static void * prom_alloc(unsigned long size, unsigned long *mem_start)
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{
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unsigned long tmp;
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if (!mem_start)
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return kmalloc(size, GFP_KERNEL);
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tmp = *mem_start;
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*mem_start += size;
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return (void *)tmp;
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}
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/*
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* Find the device_node with a given phandle.
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*/
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static struct device_node * find_phandle(phandle ph)
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{
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struct device_node *np;
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for (np = allnodes; np != 0; np = np->allnext)
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if (np->linux_phandle == ph)
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return np;
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return NULL;
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}
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/*
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* Find the interrupt parent of a node.
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*/
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static struct device_node * __devinit intr_parent(struct device_node *p)
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{
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phandle *parp;
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parp = (phandle *) get_property(p, "interrupt-parent", NULL);
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if (parp == NULL)
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return p->parent;
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p = find_phandle(*parp);
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if (p != NULL)
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return p;
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/*
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* On a powermac booted with BootX, we don't get to know the
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* phandles for any nodes, so find_phandle will return NULL.
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* Fortunately these machines only have one interrupt controller
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* so there isn't in fact any ambiguity. -- paulus
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*/
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if (num_interrupt_controllers == 1)
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p = dflt_interrupt_controller;
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return p;
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}
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/*
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* Find out the size of each entry of the interrupts property
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* for a node.
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*/
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int __devinit prom_n_intr_cells(struct device_node *np)
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{
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struct device_node *p;
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unsigned int *icp;
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for (p = np; (p = intr_parent(p)) != NULL; ) {
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icp = (unsigned int *)
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get_property(p, "#interrupt-cells", NULL);
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if (icp != NULL)
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return *icp;
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if (get_property(p, "interrupt-controller", NULL) != NULL
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|| get_property(p, "interrupt-map", NULL) != NULL) {
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printk("oops, node %s doesn't have #interrupt-cells\n",
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p->full_name);
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return 1;
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}
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}
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#ifdef DEBUG_IRQ
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printk("prom_n_intr_cells failed for %s\n", np->full_name);
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#endif
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return 1;
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}
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/*
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* Map an interrupt from a device up to the platform interrupt
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* descriptor.
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*/
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static int __devinit map_interrupt(unsigned int **irq, struct device_node **ictrler,
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struct device_node *np, unsigned int *ints,
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int nintrc)
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{
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struct device_node *p, *ipar;
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unsigned int *imap, *imask, *ip;
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int i, imaplen, match;
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int newintrc = 0, newaddrc = 0;
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unsigned int *reg;
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int naddrc;
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reg = (unsigned int *) get_property(np, "reg", NULL);
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naddrc = prom_n_addr_cells(np);
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p = intr_parent(np);
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while (p != NULL) {
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if (get_property(p, "interrupt-controller", NULL) != NULL)
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/* this node is an interrupt controller, stop here */
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break;
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imap = (unsigned int *)
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get_property(p, "interrupt-map", &imaplen);
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if (imap == NULL) {
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p = intr_parent(p);
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continue;
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}
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imask = (unsigned int *)
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get_property(p, "interrupt-map-mask", NULL);
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if (imask == NULL) {
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printk("oops, %s has interrupt-map but no mask\n",
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p->full_name);
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return 0;
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}
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imaplen /= sizeof(unsigned int);
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match = 0;
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ipar = NULL;
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while (imaplen > 0 && !match) {
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/* check the child-interrupt field */
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match = 1;
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for (i = 0; i < naddrc && match; ++i)
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match = ((reg[i] ^ imap[i]) & imask[i]) == 0;
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for (; i < naddrc + nintrc && match; ++i)
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match = ((ints[i-naddrc] ^ imap[i]) & imask[i]) == 0;
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imap += naddrc + nintrc;
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imaplen -= naddrc + nintrc;
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/* grab the interrupt parent */
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ipar = find_phandle((phandle) *imap++);
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--imaplen;
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if (ipar == NULL && num_interrupt_controllers == 1)
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/* cope with BootX not giving us phandles */
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ipar = dflt_interrupt_controller;
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if (ipar == NULL) {
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printk("oops, no int parent %x in map of %s\n",
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imap[-1], p->full_name);
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return 0;
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}
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/* find the parent's # addr and intr cells */
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ip = (unsigned int *)
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get_property(ipar, "#interrupt-cells", NULL);
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if (ip == NULL) {
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printk("oops, no #interrupt-cells on %s\n",
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ipar->full_name);
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return 0;
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}
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newintrc = *ip;
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ip = (unsigned int *)
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get_property(ipar, "#address-cells", NULL);
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newaddrc = (ip == NULL)? 0: *ip;
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imap += newaddrc + newintrc;
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imaplen -= newaddrc + newintrc;
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}
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if (imaplen < 0) {
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printk("oops, error decoding int-map on %s, len=%d\n",
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p->full_name, imaplen);
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return 0;
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}
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if (!match) {
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#ifdef DEBUG_IRQ
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printk("oops, no match in %s int-map for %s\n",
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p->full_name, np->full_name);
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#endif
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return 0;
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}
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p = ipar;
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naddrc = newaddrc;
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nintrc = newintrc;
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ints = imap - nintrc;
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reg = ints - naddrc;
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}
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if (p == NULL) {
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#ifdef DEBUG_IRQ
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printk("hmmm, int tree for %s doesn't have ctrler\n",
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np->full_name);
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#endif
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return 0;
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}
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*irq = ints;
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*ictrler = p;
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return nintrc;
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}
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static int __devinit finish_node_interrupts(struct device_node *np,
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unsigned long *mem_start,
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int measure_only)
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{
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unsigned int *ints;
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int intlen, intrcells, intrcount;
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int i, j, n;
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unsigned int *irq, virq;
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struct device_node *ic;
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ints = (unsigned int *) get_property(np, "interrupts", &intlen);
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if (ints == NULL)
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return 0;
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intrcells = prom_n_intr_cells(np);
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intlen /= intrcells * sizeof(unsigned int);
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np->intrs = prom_alloc(intlen * sizeof(*(np->intrs)), mem_start);
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if (!np->intrs)
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return -ENOMEM;
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if (measure_only)
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return 0;
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intrcount = 0;
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for (i = 0; i < intlen; ++i, ints += intrcells) {
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n = map_interrupt(&irq, &ic, np, ints, intrcells);
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if (n <= 0)
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continue;
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/* don't map IRQ numbers under a cascaded 8259 controller */
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if (ic && device_is_compatible(ic, "chrp,iic")) {
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np->intrs[intrcount].line = irq[0];
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} else {
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#ifdef CONFIG_PPC64
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virq = virt_irq_create_mapping(irq[0]);
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if (virq == NO_IRQ) {
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printk(KERN_CRIT "Could not allocate interrupt"
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" number for %s\n", np->full_name);
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continue;
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}
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virq = irq_offset_up(virq);
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#else
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virq = irq[0];
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#endif
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np->intrs[intrcount].line = virq;
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}
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#ifdef CONFIG_PPC64
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/* We offset irq numbers for the u3 MPIC by 128 in PowerMac */
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if (systemcfg->platform == PLATFORM_POWERMAC && ic && ic->parent) {
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char *name = get_property(ic->parent, "name", NULL);
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if (name && !strcmp(name, "u3"))
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np->intrs[intrcount].line += 128;
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else if (!(name && !strcmp(name, "mac-io")))
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/* ignore other cascaded controllers, such as
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the k2-sata-root */
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break;
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}
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#endif
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np->intrs[intrcount].sense = 1;
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if (n > 1)
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np->intrs[intrcount].sense = irq[1];
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if (n > 2) {
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printk("hmmm, got %d intr cells for %s:", n,
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np->full_name);
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for (j = 0; j < n; ++j)
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printk(" %d", irq[j]);
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printk("\n");
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}
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++intrcount;
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}
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np->n_intrs = intrcount;
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return 0;
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}
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static int __devinit interpret_pci_props(struct device_node *np,
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unsigned long *mem_start,
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int naddrc, int nsizec,
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int measure_only)
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{
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struct address_range *adr;
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struct pci_reg_property *pci_addrs;
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int i, l, n_addrs;
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pci_addrs = (struct pci_reg_property *)
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get_property(np, "assigned-addresses", &l);
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if (!pci_addrs)
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return 0;
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n_addrs = l / sizeof(*pci_addrs);
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adr = prom_alloc(n_addrs * sizeof(*adr), mem_start);
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if (!adr)
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return -ENOMEM;
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if (measure_only)
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return 0;
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np->addrs = adr;
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np->n_addrs = n_addrs;
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for (i = 0; i < n_addrs; i++) {
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adr[i].space = pci_addrs[i].addr.a_hi;
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adr[i].address = pci_addrs[i].addr.a_lo |
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((u64)pci_addrs[i].addr.a_mid << 32);
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adr[i].size = pci_addrs[i].size_lo;
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}
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return 0;
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}
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static int __init interpret_dbdma_props(struct device_node *np,
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unsigned long *mem_start,
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int naddrc, int nsizec,
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int measure_only)
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{
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struct reg_property32 *rp;
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struct address_range *adr;
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unsigned long base_address;
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int i, l;
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struct device_node *db;
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base_address = 0;
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if (!measure_only) {
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for (db = np->parent; db != NULL; db = db->parent) {
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if (!strcmp(db->type, "dbdma") && db->n_addrs != 0) {
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base_address = db->addrs[0].address;
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break;
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}
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}
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}
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rp = (struct reg_property32 *) get_property(np, "reg", &l);
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if (rp != 0 && l >= sizeof(struct reg_property32)) {
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i = 0;
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adr = (struct address_range *) (*mem_start);
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while ((l -= sizeof(struct reg_property32)) >= 0) {
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if (!measure_only) {
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adr[i].space = 2;
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adr[i].address = rp[i].address + base_address;
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adr[i].size = rp[i].size;
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}
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++i;
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}
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np->addrs = adr;
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np->n_addrs = i;
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(*mem_start) += i * sizeof(struct address_range);
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}
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return 0;
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}
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static int __init interpret_macio_props(struct device_node *np,
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unsigned long *mem_start,
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int naddrc, int nsizec,
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int measure_only)
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{
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struct reg_property32 *rp;
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struct address_range *adr;
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unsigned long base_address;
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int i, l;
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struct device_node *db;
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base_address = 0;
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if (!measure_only) {
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for (db = np->parent; db != NULL; db = db->parent) {
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if (!strcmp(db->type, "mac-io") && db->n_addrs != 0) {
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base_address = db->addrs[0].address;
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break;
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}
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}
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}
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rp = (struct reg_property32 *) get_property(np, "reg", &l);
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if (rp != 0 && l >= sizeof(struct reg_property32)) {
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i = 0;
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adr = (struct address_range *) (*mem_start);
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while ((l -= sizeof(struct reg_property32)) >= 0) {
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if (!measure_only) {
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adr[i].space = 2;
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adr[i].address = rp[i].address + base_address;
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adr[i].size = rp[i].size;
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}
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++i;
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}
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np->addrs = adr;
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np->n_addrs = i;
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(*mem_start) += i * sizeof(struct address_range);
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}
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return 0;
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}
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static int __init interpret_isa_props(struct device_node *np,
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unsigned long *mem_start,
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int naddrc, int nsizec,
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int measure_only)
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{
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struct isa_reg_property *rp;
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struct address_range *adr;
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int i, l;
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rp = (struct isa_reg_property *) get_property(np, "reg", &l);
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if (rp != 0 && l >= sizeof(struct isa_reg_property)) {
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i = 0;
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adr = (struct address_range *) (*mem_start);
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while ((l -= sizeof(struct isa_reg_property)) >= 0) {
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if (!measure_only) {
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adr[i].space = rp[i].space;
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adr[i].address = rp[i].address;
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adr[i].size = rp[i].size;
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}
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++i;
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}
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np->addrs = adr;
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np->n_addrs = i;
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(*mem_start) += i * sizeof(struct address_range);
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}
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return 0;
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}
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|
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static int __init interpret_root_props(struct device_node *np,
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unsigned long *mem_start,
|
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int naddrc, int nsizec,
|
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int measure_only)
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{
|
|
struct address_range *adr;
|
|
int i, l;
|
|
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) {
|
|
if (!measure_only) {
|
|
adr[i].space = 0;
|
|
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);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __devinit finish_node(struct device_node *np,
|
|
unsigned long *mem_start,
|
|
interpret_func *ifunc,
|
|
int naddrc, int nsizec,
|
|
int measure_only)
|
|
{
|
|
struct device_node *child;
|
|
int *ip, rc = 0;
|
|
|
|
/* get the device addresses and interrupts */
|
|
if (ifunc != NULL)
|
|
rc = ifunc(np, mem_start, naddrc, nsizec, measure_only);
|
|
if (rc)
|
|
goto out;
|
|
|
|
rc = finish_node_interrupts(np, mem_start, measure_only);
|
|
if (rc)
|
|
goto out;
|
|
|
|
/* 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 (!strcmp(np->name, "device-tree") || 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;
|
|
|
|
for (child = np->child; child != NULL; child = child->sibling) {
|
|
rc = finish_node(child, mem_start, ifunc,
|
|
naddrc, nsizec, measure_only);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static void __init scan_interrupt_controllers(void)
|
|
{
|
|
struct device_node *np;
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* 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 some of the additional,
|
|
* fields in each node like {n_}addrs and {n_}intrs, the virt interrupt
|
|
* mapping is also initialized at this point.
|
|
*/
|
|
void __init finish_device_tree(void)
|
|
{
|
|
unsigned long start, end, size = 0;
|
|
|
|
DBG(" -> finish_device_tree\n");
|
|
|
|
#ifdef CONFIG_PPC64
|
|
/* Initialize virtual IRQ map */
|
|
virt_irq_init();
|
|
#endif
|
|
scan_interrupt_controllers();
|
|
|
|
/*
|
|
* Finish device-tree (pre-parsing some properties etc...)
|
|
* We do this in 2 passes. One with "measure_only" set, which
|
|
* will only measure the amount of memory needed, then we can
|
|
* allocate that memory, and call finish_node again. However,
|
|
* we must be careful as most routines will fail nowadays when
|
|
* prom_alloc() returns 0, so we must make sure our first pass
|
|
* doesn't start at 0. We pre-initialize size to 16 for that
|
|
* reason and then remove those additional 16 bytes
|
|
*/
|
|
size = 16;
|
|
finish_node(allnodes, &size, NULL, 0, 0, 1);
|
|
size -= 16;
|
|
end = start = (unsigned long) __va(lmb_alloc(size, 128));
|
|
finish_node(allnodes, &end, NULL, 0, 0, 0);
|
|
BUG_ON(end != start + size);
|
|
|
|
DBG(" <- finish_device_tree\n");
|
|
}
|
|
|
|
static inline char *find_flat_dt_string(u32 offset)
|
|
{
|
|
return ((char *)initial_boot_params) +
|
|
initial_boot_params->off_dt_strings + offset;
|
|
}
|
|
|
|
/**
|
|
* This function is used to scan the flattened device-tree, it is
|
|
* used to extract the memory informations at boot before we can
|
|
* unflatten the tree
|
|
*/
|
|
static int __init scan_flat_dt(int (*it)(unsigned long node,
|
|
const char *uname, int depth,
|
|
void *data),
|
|
void *data)
|
|
{
|
|
unsigned long p = ((unsigned long)initial_boot_params) +
|
|
initial_boot_params->off_dt_struct;
|
|
int rc = 0;
|
|
int depth = -1;
|
|
|
|
do {
|
|
u32 tag = *((u32 *)p);
|
|
char *pathp;
|
|
|
|
p += 4;
|
|
if (tag == OF_DT_END_NODE) {
|
|
depth --;
|
|
continue;
|
|
}
|
|
if (tag == OF_DT_NOP)
|
|
continue;
|
|
if (tag == OF_DT_END)
|
|
break;
|
|
if (tag == OF_DT_PROP) {
|
|
u32 sz = *((u32 *)p);
|
|
p += 8;
|
|
if (initial_boot_params->version < 0x10)
|
|
p = _ALIGN(p, sz >= 8 ? 8 : 4);
|
|
p += sz;
|
|
p = _ALIGN(p, 4);
|
|
continue;
|
|
}
|
|
if (tag != OF_DT_BEGIN_NODE) {
|
|
printk(KERN_WARNING "Invalid tag %x scanning flattened"
|
|
" device tree !\n", tag);
|
|
return -EINVAL;
|
|
}
|
|
depth++;
|
|
pathp = (char *)p;
|
|
p = _ALIGN(p + strlen(pathp) + 1, 4);
|
|
if ((*pathp) == '/') {
|
|
char *lp, *np;
|
|
for (lp = NULL, np = pathp; *np; np++)
|
|
if ((*np) == '/')
|
|
lp = np+1;
|
|
if (lp != NULL)
|
|
pathp = lp;
|
|
}
|
|
rc = it(p, pathp, depth, data);
|
|
if (rc != 0)
|
|
break;
|
|
} while(1);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* This function can be used within scan_flattened_dt callback to get
|
|
* access to properties
|
|
*/
|
|
static void* __init get_flat_dt_prop(unsigned long node, const char *name,
|
|
unsigned long *size)
|
|
{
|
|
unsigned long p = node;
|
|
|
|
do {
|
|
u32 tag = *((u32 *)p);
|
|
u32 sz, noff;
|
|
const char *nstr;
|
|
|
|
p += 4;
|
|
if (tag == OF_DT_NOP)
|
|
continue;
|
|
if (tag != OF_DT_PROP)
|
|
return NULL;
|
|
|
|
sz = *((u32 *)p);
|
|
noff = *((u32 *)(p + 4));
|
|
p += 8;
|
|
if (initial_boot_params->version < 0x10)
|
|
p = _ALIGN(p, sz >= 8 ? 8 : 4);
|
|
|
|
nstr = find_flat_dt_string(noff);
|
|
if (nstr == NULL) {
|
|
printk(KERN_WARNING "Can't find property index"
|
|
" name !\n");
|
|
return NULL;
|
|
}
|
|
if (strcmp(name, nstr) == 0) {
|
|
if (size)
|
|
*size = sz;
|
|
return (void *)p;
|
|
}
|
|
p += sz;
|
|
p = _ALIGN(p, 4);
|
|
} while(1);
|
|
}
|
|
|
|
static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size,
|
|
unsigned long align)
|
|
{
|
|
void *res;
|
|
|
|
*mem = _ALIGN(*mem, align);
|
|
res = (void *)*mem;
|
|
*mem += size;
|
|
|
|
return res;
|
|
}
|
|
|
|
static unsigned long __init unflatten_dt_node(unsigned long mem,
|
|
unsigned long *p,
|
|
struct device_node *dad,
|
|
struct device_node ***allnextpp,
|
|
unsigned long fpsize)
|
|
{
|
|
struct device_node *np;
|
|
struct property *pp, **prev_pp = NULL;
|
|
char *pathp;
|
|
u32 tag;
|
|
unsigned int l, allocl;
|
|
int has_name = 0;
|
|
int new_format = 0;
|
|
|
|
tag = *((u32 *)(*p));
|
|
if (tag != OF_DT_BEGIN_NODE) {
|
|
printk("Weird tag at start of node: %x\n", tag);
|
|
return mem;
|
|
}
|
|
*p += 4;
|
|
pathp = (char *)*p;
|
|
l = allocl = strlen(pathp) + 1;
|
|
*p = _ALIGN(*p + l, 4);
|
|
|
|
/* version 0x10 has a more compact unit name here instead of the full
|
|
* path. we accumulate the full path size using "fpsize", we'll rebuild
|
|
* it later. We detect this because the first character of the name is
|
|
* not '/'.
|
|
*/
|
|
if ((*pathp) != '/') {
|
|
new_format = 1;
|
|
if (fpsize == 0) {
|
|
/* root node: special case. fpsize accounts for path
|
|
* plus terminating zero. root node only has '/', so
|
|
* fpsize should be 2, but we want to avoid the first
|
|
* level nodes to have two '/' so we use fpsize 1 here
|
|
*/
|
|
fpsize = 1;
|
|
allocl = 2;
|
|
} else {
|
|
/* account for '/' and path size minus terminal 0
|
|
* already in 'l'
|
|
*/
|
|
fpsize += l;
|
|
allocl = fpsize;
|
|
}
|
|
}
|
|
|
|
|
|
np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
|
|
__alignof__(struct device_node));
|
|
if (allnextpp) {
|
|
memset(np, 0, sizeof(*np));
|
|
np->full_name = ((char*)np) + sizeof(struct device_node);
|
|
if (new_format) {
|
|
char *p = np->full_name;
|
|
/* rebuild full path for new format */
|
|
if (dad && dad->parent) {
|
|
strcpy(p, dad->full_name);
|
|
#ifdef DEBUG
|
|
if ((strlen(p) + l + 1) != allocl) {
|
|
DBG("%s: p: %d, l: %d, a: %d\n",
|
|
pathp, strlen(p), l, allocl);
|
|
}
|
|
#endif
|
|
p += strlen(p);
|
|
}
|
|
*(p++) = '/';
|
|
memcpy(p, pathp, l);
|
|
} else
|
|
memcpy(np->full_name, pathp, l);
|
|
prev_pp = &np->properties;
|
|
**allnextpp = np;
|
|
*allnextpp = &np->allnext;
|
|
if (dad != NULL) {
|
|
np->parent = dad;
|
|
/* we temporarily use the next field as `last_child'*/
|
|
if (dad->next == 0)
|
|
dad->child = np;
|
|
else
|
|
dad->next->sibling = np;
|
|
dad->next = np;
|
|
}
|
|
kref_init(&np->kref);
|
|
}
|
|
while(1) {
|
|
u32 sz, noff;
|
|
char *pname;
|
|
|
|
tag = *((u32 *)(*p));
|
|
if (tag == OF_DT_NOP) {
|
|
*p += 4;
|
|
continue;
|
|
}
|
|
if (tag != OF_DT_PROP)
|
|
break;
|
|
*p += 4;
|
|
sz = *((u32 *)(*p));
|
|
noff = *((u32 *)((*p) + 4));
|
|
*p += 8;
|
|
if (initial_boot_params->version < 0x10)
|
|
*p = _ALIGN(*p, sz >= 8 ? 8 : 4);
|
|
|
|
pname = find_flat_dt_string(noff);
|
|
if (pname == NULL) {
|
|
printk("Can't find property name in list !\n");
|
|
break;
|
|
}
|
|
if (strcmp(pname, "name") == 0)
|
|
has_name = 1;
|
|
l = strlen(pname) + 1;
|
|
pp = unflatten_dt_alloc(&mem, sizeof(struct property),
|
|
__alignof__(struct property));
|
|
if (allnextpp) {
|
|
if (strcmp(pname, "linux,phandle") == 0) {
|
|
np->node = *((u32 *)*p);
|
|
if (np->linux_phandle == 0)
|
|
np->linux_phandle = np->node;
|
|
}
|
|
if (strcmp(pname, "ibm,phandle") == 0)
|
|
np->linux_phandle = *((u32 *)*p);
|
|
pp->name = pname;
|
|
pp->length = sz;
|
|
pp->value = (void *)*p;
|
|
*prev_pp = pp;
|
|
prev_pp = &pp->next;
|
|
}
|
|
*p = _ALIGN((*p) + sz, 4);
|
|
}
|
|
/* with version 0x10 we may not have the name property, recreate
|
|
* it here from the unit name if absent
|
|
*/
|
|
if (!has_name) {
|
|
char *p = pathp, *ps = pathp, *pa = NULL;
|
|
int sz;
|
|
|
|
while (*p) {
|
|
if ((*p) == '@')
|
|
pa = p;
|
|
if ((*p) == '/')
|
|
ps = p + 1;
|
|
p++;
|
|
}
|
|
if (pa < ps)
|
|
pa = p;
|
|
sz = (pa - ps) + 1;
|
|
pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
|
|
__alignof__(struct property));
|
|
if (allnextpp) {
|
|
pp->name = "name";
|
|
pp->length = sz;
|
|
pp->value = (unsigned char *)(pp + 1);
|
|
*prev_pp = pp;
|
|
prev_pp = &pp->next;
|
|
memcpy(pp->value, ps, sz - 1);
|
|
((char *)pp->value)[sz - 1] = 0;
|
|
DBG("fixed up name for %s -> %s\n", pathp, pp->value);
|
|
}
|
|
}
|
|
if (allnextpp) {
|
|
*prev_pp = NULL;
|
|
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>";
|
|
}
|
|
while (tag == OF_DT_BEGIN_NODE) {
|
|
mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize);
|
|
tag = *((u32 *)(*p));
|
|
}
|
|
if (tag != OF_DT_END_NODE) {
|
|
printk("Weird tag at end of node: %x\n", tag);
|
|
return mem;
|
|
}
|
|
*p += 4;
|
|
return mem;
|
|
}
|
|
|
|
|
|
/**
|
|
* unflattens the device-tree passed by the firmware, creating the
|
|
* tree of struct device_node. It also fills the "name" and "type"
|
|
* pointers of the nodes so the normal device-tree walking functions
|
|
* can be used (this used to be done by finish_device_tree)
|
|
*/
|
|
void __init unflatten_device_tree(void)
|
|
{
|
|
unsigned long start, mem, size;
|
|
struct device_node **allnextp = &allnodes;
|
|
char *p = NULL;
|
|
int l = 0;
|
|
|
|
DBG(" -> unflatten_device_tree()\n");
|
|
|
|
/* First pass, scan for size */
|
|
start = ((unsigned long)initial_boot_params) +
|
|
initial_boot_params->off_dt_struct;
|
|
size = unflatten_dt_node(0, &start, NULL, NULL, 0);
|
|
size = (size | 3) + 1;
|
|
|
|
DBG(" size is %lx, allocating...\n", size);
|
|
|
|
/* Allocate memory for the expanded device tree */
|
|
mem = lmb_alloc(size + 4, __alignof__(struct device_node));
|
|
if (!mem) {
|
|
DBG("Couldn't allocate memory with lmb_alloc()!\n");
|
|
panic("Couldn't allocate memory with lmb_alloc()!\n");
|
|
}
|
|
mem = (unsigned long) __va(mem);
|
|
|
|
((u32 *)mem)[size / 4] = 0xdeadbeef;
|
|
|
|
DBG(" unflattening %lx...\n", mem);
|
|
|
|
/* Second pass, do actual unflattening */
|
|
start = ((unsigned long)initial_boot_params) +
|
|
initial_boot_params->off_dt_struct;
|
|
unflatten_dt_node(mem, &start, NULL, &allnextp, 0);
|
|
if (*((u32 *)start) != OF_DT_END)
|
|
printk(KERN_WARNING "Weird tag at end of tree: %08x\n", *((u32 *)start));
|
|
if (((u32 *)mem)[size / 4] != 0xdeadbeef)
|
|
printk(KERN_WARNING "End of tree marker overwritten: %08x\n",
|
|
((u32 *)mem)[size / 4] );
|
|
*allnextp = NULL;
|
|
|
|
/* Get pointer to OF "/chosen" node for use everywhere */
|
|
of_chosen = of_find_node_by_path("/chosen");
|
|
|
|
/* Retreive command line */
|
|
if (of_chosen != NULL) {
|
|
p = (char *)get_property(of_chosen, "bootargs", &l);
|
|
if (p != NULL && l > 0)
|
|
strlcpy(cmd_line, p, min(l, COMMAND_LINE_SIZE));
|
|
}
|
|
#ifdef CONFIG_CMDLINE
|
|
if (l == 0 || (l == 1 && (*p) == 0))
|
|
strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
|
|
#endif /* CONFIG_CMDLINE */
|
|
|
|
DBG("Command line is: %s\n", cmd_line);
|
|
|
|
DBG(" <- unflatten_device_tree()\n");
|
|
}
|
|
|
|
|
|
static int __init early_init_dt_scan_cpus(unsigned long node,
|
|
const char *uname, int depth, void *data)
|
|
{
|
|
char *type = get_flat_dt_prop(node, "device_type", NULL);
|
|
u32 *prop;
|
|
unsigned long size = 0;
|
|
|
|
/* We are scanning "cpu" nodes only */
|
|
if (type == NULL || strcmp(type, "cpu") != 0)
|
|
return 0;
|
|
|
|
#ifdef CONFIG_PPC_PSERIES
|
|
/* On LPAR, look for the first ibm,pft-size property for the hash table size
|
|
*/
|
|
if (systemcfg->platform == PLATFORM_PSERIES_LPAR && ppc64_pft_size == 0) {
|
|
u32 *pft_size;
|
|
pft_size = get_flat_dt_prop(node, "ibm,pft-size", NULL);
|
|
if (pft_size != NULL) {
|
|
/* pft_size[0] is the NUMA CEC cookie */
|
|
ppc64_pft_size = pft_size[1];
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_PPC64
|
|
if (initial_boot_params && initial_boot_params->version >= 2) {
|
|
/* version 2 of the kexec param format adds the phys cpuid
|
|
* of booted proc.
|
|
*/
|
|
boot_cpuid_phys = initial_boot_params->boot_cpuid_phys;
|
|
boot_cpuid = 0;
|
|
} else {
|
|
/* Check if it's the boot-cpu, set it's hw index in paca now */
|
|
if (get_flat_dt_prop(node, "linux,boot-cpu", NULL) != NULL) {
|
|
prop = get_flat_dt_prop(node, "reg", NULL);
|
|
set_hard_smp_processor_id(0, prop == NULL ? 0 : *prop);
|
|
boot_cpuid_phys = get_hard_smp_processor_id(0);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_ALTIVEC
|
|
/* Check if we have a VMX and eventually update CPU features */
|
|
prop = (u32 *)get_flat_dt_prop(node, "ibm,vmx", &size);
|
|
if (prop && (*prop) > 0) {
|
|
cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC;
|
|
cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC;
|
|
}
|
|
|
|
/* Same goes for Apple's "altivec" property */
|
|
prop = (u32 *)get_flat_dt_prop(node, "altivec", NULL);
|
|
if (prop) {
|
|
cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC;
|
|
cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC;
|
|
}
|
|
#endif /* CONFIG_ALTIVEC */
|
|
|
|
#ifdef CONFIG_PPC_PSERIES
|
|
/*
|
|
* Check for an SMT capable CPU and set the CPU feature. We do
|
|
* this by looking at the size of the ibm,ppc-interrupt-server#s
|
|
* property
|
|
*/
|
|
prop = (u32 *)get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s",
|
|
&size);
|
|
cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
|
|
if (prop && ((size / sizeof(u32)) > 1))
|
|
cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init early_init_dt_scan_chosen(unsigned long node,
|
|
const char *uname, int depth, void *data)
|
|
{
|
|
u32 *prop;
|
|
unsigned long *lprop;
|
|
|
|
DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
|
|
|
|
if (depth != 1 || strcmp(uname, "chosen") != 0)
|
|
return 0;
|
|
|
|
/* get platform type */
|
|
prop = (u32 *)get_flat_dt_prop(node, "linux,platform", NULL);
|
|
if (prop == NULL)
|
|
return 0;
|
|
#ifdef CONFIG_PPC64
|
|
systemcfg->platform = *prop;
|
|
#else
|
|
_machine = *prop;
|
|
#endif
|
|
|
|
#ifdef CONFIG_PPC64
|
|
/* check if iommu is forced on or off */
|
|
if (get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
|
|
iommu_is_off = 1;
|
|
if (get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
|
|
iommu_force_on = 1;
|
|
#endif
|
|
|
|
lprop = get_flat_dt_prop(node, "linux,memory-limit", NULL);
|
|
if (lprop)
|
|
memory_limit = *lprop;
|
|
|
|
#ifdef CONFIG_PPC64
|
|
lprop = get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
|
|
if (lprop)
|
|
tce_alloc_start = *lprop;
|
|
lprop = get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
|
|
if (lprop)
|
|
tce_alloc_end = *lprop;
|
|
#endif
|
|
|
|
#ifdef CONFIG_PPC_RTAS
|
|
/* To help early debugging via the front panel, we retreive a minimal
|
|
* set of RTAS infos now if available
|
|
*/
|
|
{
|
|
u64 *basep, *entryp;
|
|
|
|
basep = get_flat_dt_prop(node, "linux,rtas-base", NULL);
|
|
entryp = get_flat_dt_prop(node, "linux,rtas-entry", NULL);
|
|
prop = get_flat_dt_prop(node, "linux,rtas-size", NULL);
|
|
if (basep && entryp && prop) {
|
|
rtas.base = *basep;
|
|
rtas.entry = *entryp;
|
|
rtas.size = *prop;
|
|
}
|
|
}
|
|
#endif /* CONFIG_PPC_RTAS */
|
|
|
|
/* break now */
|
|
return 1;
|
|
}
|
|
|
|
static int __init early_init_dt_scan_root(unsigned long node,
|
|
const char *uname, int depth, void *data)
|
|
{
|
|
u32 *prop;
|
|
|
|
if (depth != 0)
|
|
return 0;
|
|
|
|
prop = get_flat_dt_prop(node, "#size-cells", NULL);
|
|
dt_root_size_cells = (prop == NULL) ? 1 : *prop;
|
|
DBG("dt_root_size_cells = %x\n", dt_root_size_cells);
|
|
|
|
prop = get_flat_dt_prop(node, "#address-cells", NULL);
|
|
dt_root_addr_cells = (prop == NULL) ? 2 : *prop;
|
|
DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells);
|
|
|
|
/* break now */
|
|
return 1;
|
|
}
|
|
|
|
static unsigned long __init dt_mem_next_cell(int s, cell_t **cellp)
|
|
{
|
|
cell_t *p = *cellp;
|
|
unsigned long r;
|
|
|
|
/* Ignore more than 2 cells */
|
|
while (s > sizeof(unsigned long) / 4) {
|
|
p++;
|
|
s--;
|
|
}
|
|
r = *p++;
|
|
#ifdef CONFIG_PPC64
|
|
if (s > 1) {
|
|
r <<= 32;
|
|
r |= *(p++);
|
|
s--;
|
|
}
|
|
#endif
|
|
|
|
*cellp = p;
|
|
return r;
|
|
}
|
|
|
|
|
|
static int __init early_init_dt_scan_memory(unsigned long node,
|
|
const char *uname, int depth, void *data)
|
|
{
|
|
char *type = get_flat_dt_prop(node, "device_type", NULL);
|
|
cell_t *reg, *endp;
|
|
unsigned long l;
|
|
|
|
/* We are scanning "memory" nodes only */
|
|
if (type == NULL || strcmp(type, "memory") != 0)
|
|
return 0;
|
|
|
|
reg = (cell_t *)get_flat_dt_prop(node, "reg", &l);
|
|
if (reg == NULL)
|
|
return 0;
|
|
|
|
endp = reg + (l / sizeof(cell_t));
|
|
|
|
DBG("memory scan node %s ..., reg size %ld, data: %x %x %x %x, ...\n",
|
|
uname, l, reg[0], reg[1], reg[2], reg[3]);
|
|
|
|
while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
|
|
unsigned long base, size;
|
|
|
|
base = dt_mem_next_cell(dt_root_addr_cells, ®);
|
|
size = dt_mem_next_cell(dt_root_size_cells, ®);
|
|
|
|
if (size == 0)
|
|
continue;
|
|
DBG(" - %lx , %lx\n", base, size);
|
|
#ifdef CONFIG_PPC64
|
|
if (iommu_is_off) {
|
|
if (base >= 0x80000000ul)
|
|
continue;
|
|
if ((base + size) > 0x80000000ul)
|
|
size = 0x80000000ul - base;
|
|
}
|
|
#endif
|
|
lmb_add(base, size);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void __init early_reserve_mem(void)
|
|
{
|
|
unsigned long base, size;
|
|
unsigned long *reserve_map;
|
|
|
|
reserve_map = (unsigned long *)(((unsigned long)initial_boot_params) +
|
|
initial_boot_params->off_mem_rsvmap);
|
|
while (1) {
|
|
base = *(reserve_map++);
|
|
size = *(reserve_map++);
|
|
if (size == 0)
|
|
break;
|
|
DBG("reserving: %lx -> %lx\n", base, size);
|
|
lmb_reserve(base, size);
|
|
}
|
|
|
|
#if 0
|
|
DBG("memory reserved, lmbs :\n");
|
|
lmb_dump_all();
|
|
#endif
|
|
}
|
|
|
|
void __init early_init_devtree(void *params)
|
|
{
|
|
DBG(" -> early_init_devtree()\n");
|
|
|
|
/* Setup flat device-tree pointer */
|
|
initial_boot_params = params;
|
|
|
|
/* Retrieve various informations from the /chosen node of the
|
|
* device-tree, including the platform type, initrd location and
|
|
* size, TCE reserve, and more ...
|
|
*/
|
|
scan_flat_dt(early_init_dt_scan_chosen, NULL);
|
|
|
|
/* Scan memory nodes and rebuild LMBs */
|
|
lmb_init();
|
|
scan_flat_dt(early_init_dt_scan_root, NULL);
|
|
scan_flat_dt(early_init_dt_scan_memory, NULL);
|
|
lmb_enforce_memory_limit(memory_limit);
|
|
lmb_analyze();
|
|
#ifdef CONFIG_PPC64
|
|
systemcfg->physicalMemorySize = lmb_phys_mem_size();
|
|
#endif
|
|
lmb_reserve(0, __pa(klimit));
|
|
|
|
DBG("Phys. mem: %lx\n", lmb_phys_mem_size());
|
|
|
|
/* Reserve LMB regions used by kernel, initrd, dt, etc... */
|
|
early_reserve_mem();
|
|
|
|
DBG("Scanning CPUs ...\n");
|
|
|
|
/* Retreive hash table size from flattened tree plus other
|
|
* CPU related informations (altivec support, boot CPU ID, ...)
|
|
*/
|
|
scan_flat_dt(early_init_dt_scan_cpus, NULL);
|
|
|
|
DBG(" <- early_init_devtree()\n");
|
|
}
|
|
|
|
#undef printk
|
|
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
|
|
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 ?
|
|
IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE :
|
|
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;
|
|
}
|
|
EXPORT_SYMBOL(find_devices);
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
EXPORT_SYMBOL(find_type_devices);
|
|
|
|
/**
|
|
* Returns all nodes linked together
|
|
*/
|
|
struct device_node *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;
|
|
}
|
|
EXPORT_SYMBOL(find_all_nodes);
|
|
|
|
/** 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;
|
|
}
|
|
EXPORT_SYMBOL(device_is_compatible);
|
|
|
|
|
|
/**
|
|
* Indicates whether the root node has a given value in its
|
|
* compatible property.
|
|
*/
|
|
int machine_is_compatible(const char *compat)
|
|
{
|
|
struct device_node *root;
|
|
int rc = 0;
|
|
|
|
root = of_find_node_by_path("/");
|
|
if (root) {
|
|
rc = device_is_compatible(root, compat);
|
|
of_node_put(root);
|
|
}
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(machine_is_compatible);
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
EXPORT_SYMBOL(find_compatible_devices);
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
EXPORT_SYMBOL(find_path_device);
|
|
|
|
/*******
|
|
*
|
|
* New implementation of the OF "find" APIs, return a refcounted
|
|
* object, call of_node_put() when done. The device tree and list
|
|
* are protected by a rw_lock.
|
|
*
|
|
* 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 its "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;
|
|
|
|
read_lock(&devtree_lock);
|
|
np = from ? from->allnext : allnodes;
|
|
for (; np != 0; np = np->allnext)
|
|
if (np->name != 0 && strcasecmp(np->name, name) == 0
|
|
&& of_node_get(np))
|
|
break;
|
|
if (from)
|
|
of_node_put(from);
|
|
read_unlock(&devtree_lock);
|
|
return np;
|
|
}
|
|
EXPORT_SYMBOL(of_find_node_by_name);
|
|
|
|
/**
|
|
* of_find_node_by_type - Find a node by its "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.
|
|
*/
|
|
struct device_node *of_find_node_by_type(struct device_node *from,
|
|
const char *type)
|
|
{
|
|
struct device_node *np;
|
|
|
|
read_lock(&devtree_lock);
|
|
np = from ? from->allnext : allnodes;
|
|
for (; np != 0; np = np->allnext)
|
|
if (np->type != 0 && strcasecmp(np->type, type) == 0
|
|
&& of_node_get(np))
|
|
break;
|
|
if (from)
|
|
of_node_put(from);
|
|
read_unlock(&devtree_lock);
|
|
return np;
|
|
}
|
|
EXPORT_SYMBOL(of_find_node_by_type);
|
|
|
|
/**
|
|
* of_find_compatible_node - Find a node based on type and one of the
|
|
* tokens in its "compatible" 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
|
|
* @type: The type string to match "device_type" or NULL to ignore
|
|
* @compatible: The string to match to one of the tokens in the device
|
|
* "compatible" list.
|
|
*
|
|
* Returns a node pointer with refcount incremented, use
|
|
* of_node_put() on it when done.
|
|
*/
|
|
struct device_node *of_find_compatible_node(struct device_node *from,
|
|
const char *type, const char *compatible)
|
|
{
|
|
struct device_node *np;
|
|
|
|
read_lock(&devtree_lock);
|
|
np = from ? from->allnext : allnodes;
|
|
for (; np != 0; np = np->allnext) {
|
|
if (type != NULL
|
|
&& !(np->type != 0 && strcasecmp(np->type, type) == 0))
|
|
continue;
|
|
if (device_is_compatible(np, compatible) && of_node_get(np))
|
|
break;
|
|
}
|
|
if (from)
|
|
of_node_put(from);
|
|
read_unlock(&devtree_lock);
|
|
return np;
|
|
}
|
|
EXPORT_SYMBOL(of_find_compatible_node);
|
|
|
|
/**
|
|
* of_find_node_by_path - Find a node matching a full OF path
|
|
* @path: The full path to match
|
|
*
|
|
* Returns a node pointer with refcount incremented, use
|
|
* of_node_put() on it when done.
|
|
*/
|
|
struct device_node *of_find_node_by_path(const char *path)
|
|
{
|
|
struct device_node *np = allnodes;
|
|
|
|
read_lock(&devtree_lock);
|
|
for (; np != 0; np = np->allnext) {
|
|
if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0
|
|
&& of_node_get(np))
|
|
break;
|
|
}
|
|
read_unlock(&devtree_lock);
|
|
return np;
|
|
}
|
|
EXPORT_SYMBOL(of_find_node_by_path);
|
|
|
|
/**
|
|
* of_find_node_by_phandle - Find a node given a phandle
|
|
* @handle: phandle of the node to find
|
|
*
|
|
* Returns a node pointer with refcount incremented, use
|
|
* of_node_put() on it when done.
|
|
*/
|
|
struct device_node *of_find_node_by_phandle(phandle handle)
|
|
{
|
|
struct device_node *np;
|
|
|
|
read_lock(&devtree_lock);
|
|
for (np = allnodes; np != 0; np = np->allnext)
|
|
if (np->linux_phandle == handle)
|
|
break;
|
|
if (np)
|
|
of_node_get(np);
|
|
read_unlock(&devtree_lock);
|
|
return np;
|
|
}
|
|
EXPORT_SYMBOL(of_find_node_by_phandle);
|
|
|
|
/**
|
|
* of_find_all_nodes - Get next node in global list
|
|
* @prev: Previous node or NULL to start iteration
|
|
* of_node_put() will be called on it
|
|
*
|
|
* Returns a node pointer with refcount incremented, use
|
|
* of_node_put() on it when done.
|
|
*/
|
|
struct device_node *of_find_all_nodes(struct device_node *prev)
|
|
{
|
|
struct device_node *np;
|
|
|
|
read_lock(&devtree_lock);
|
|
np = prev ? prev->allnext : allnodes;
|
|
for (; np != 0; np = np->allnext)
|
|
if (of_node_get(np))
|
|
break;
|
|
if (prev)
|
|
of_node_put(prev);
|
|
read_unlock(&devtree_lock);
|
|
return np;
|
|
}
|
|
EXPORT_SYMBOL(of_find_all_nodes);
|
|
|
|
/**
|
|
* of_get_parent - Get a node's parent if any
|
|
* @node: Node to get parent
|
|
*
|
|
* Returns a node pointer with refcount incremented, use
|
|
* of_node_put() on it when done.
|
|
*/
|
|
struct device_node *of_get_parent(const struct device_node *node)
|
|
{
|
|
struct device_node *np;
|
|
|
|
if (!node)
|
|
return NULL;
|
|
|
|
read_lock(&devtree_lock);
|
|
np = of_node_get(node->parent);
|
|
read_unlock(&devtree_lock);
|
|
return np;
|
|
}
|
|
EXPORT_SYMBOL(of_get_parent);
|
|
|
|
/**
|
|
* of_get_next_child - Iterate a node childs
|
|
* @node: parent node
|
|
* @prev: previous child of the parent node, or NULL to get first
|
|
*
|
|
* Returns a node pointer with refcount incremented, use
|
|
* of_node_put() on it when done.
|
|
*/
|
|
struct device_node *of_get_next_child(const struct device_node *node,
|
|
struct device_node *prev)
|
|
{
|
|
struct device_node *next;
|
|
|
|
read_lock(&devtree_lock);
|
|
next = prev ? prev->sibling : node->child;
|
|
for (; next != 0; next = next->sibling)
|
|
if (of_node_get(next))
|
|
break;
|
|
if (prev)
|
|
of_node_put(prev);
|
|
read_unlock(&devtree_lock);
|
|
return next;
|
|
}
|
|
EXPORT_SYMBOL(of_get_next_child);
|
|
|
|
/**
|
|
* of_node_get - Increment refcount of a node
|
|
* @node: Node to inc refcount, NULL is supported to
|
|
* simplify writing of callers
|
|
*
|
|
* Returns node.
|
|
*/
|
|
struct device_node *of_node_get(struct device_node *node)
|
|
{
|
|
if (node)
|
|
kref_get(&node->kref);
|
|
return node;
|
|
}
|
|
EXPORT_SYMBOL(of_node_get);
|
|
|
|
static inline struct device_node * kref_to_device_node(struct kref *kref)
|
|
{
|
|
return container_of(kref, struct device_node, kref);
|
|
}
|
|
|
|
/**
|
|
* of_node_release - release a dynamically allocated node
|
|
* @kref: kref element of the node to be released
|
|
*
|
|
* In of_node_put() this function is passed to kref_put()
|
|
* as the destructor.
|
|
*/
|
|
static void of_node_release(struct kref *kref)
|
|
{
|
|
struct device_node *node = kref_to_device_node(kref);
|
|
struct property *prop = node->properties;
|
|
|
|
if (!OF_IS_DYNAMIC(node))
|
|
return;
|
|
while (prop) {
|
|
struct property *next = prop->next;
|
|
kfree(prop->name);
|
|
kfree(prop->value);
|
|
kfree(prop);
|
|
prop = next;
|
|
}
|
|
kfree(node->intrs);
|
|
kfree(node->addrs);
|
|
kfree(node->full_name);
|
|
kfree(node->data);
|
|
kfree(node);
|
|
}
|
|
|
|
/**
|
|
* of_node_put - Decrement refcount of a node
|
|
* @node: Node to dec refcount, NULL is supported to
|
|
* simplify writing of callers
|
|
*
|
|
*/
|
|
void of_node_put(struct device_node *node)
|
|
{
|
|
if (node)
|
|
kref_put(&node->kref, of_node_release);
|
|
}
|
|
EXPORT_SYMBOL(of_node_put);
|
|
|
|
/*
|
|
* Plug a device node into the tree and global list.
|
|
*/
|
|
void of_attach_node(struct device_node *np)
|
|
{
|
|
write_lock(&devtree_lock);
|
|
np->sibling = np->parent->child;
|
|
np->allnext = allnodes;
|
|
np->parent->child = np;
|
|
allnodes = np;
|
|
write_unlock(&devtree_lock);
|
|
}
|
|
|
|
/*
|
|
* "Unplug" a node from the device tree. The caller must hold
|
|
* a reference to the node. The memory associated with the node
|
|
* is not freed until its refcount goes to zero.
|
|
*/
|
|
void of_detach_node(const struct device_node *np)
|
|
{
|
|
struct device_node *parent;
|
|
|
|
write_lock(&devtree_lock);
|
|
|
|
parent = np->parent;
|
|
|
|
if (allnodes == np)
|
|
allnodes = np->allnext;
|
|
else {
|
|
struct device_node *prev;
|
|
for (prev = allnodes;
|
|
prev->allnext != np;
|
|
prev = prev->allnext)
|
|
;
|
|
prev->allnext = np->allnext;
|
|
}
|
|
|
|
if (parent->child == np)
|
|
parent->child = np->sibling;
|
|
else {
|
|
struct device_node *prevsib;
|
|
for (prevsib = np->parent->child;
|
|
prevsib->sibling != np;
|
|
prevsib = prevsib->sibling)
|
|
;
|
|
prevsib->sibling = np->sibling;
|
|
}
|
|
|
|
write_unlock(&devtree_lock);
|
|
}
|
|
|
|
#ifdef CONFIG_PPC_PSERIES
|
|
/*
|
|
* Fix up the uninitialized fields in a new device node:
|
|
* name, type, n_addrs, addrs, n_intrs, intrs, and pci-specific fields
|
|
*
|
|
* A lot of boot-time code is duplicated here, because functions such
|
|
* as finish_node_interrupts, interpret_pci_props, etc. cannot use the
|
|
* slab allocator.
|
|
*
|
|
* This should probably be split up into smaller chunks.
|
|
*/
|
|
|
|
static int of_finish_dynamic_node(struct device_node *node,
|
|
unsigned long *unused1, int unused2,
|
|
int unused3, int unused4)
|
|
{
|
|
struct device_node *parent = of_get_parent(node);
|
|
int err = 0;
|
|
phandle *ibm_phandle;
|
|
|
|
node->name = get_property(node, "name", NULL);
|
|
node->type = get_property(node, "device_type", NULL);
|
|
|
|
if (!parent) {
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
/* We don't support that function on PowerMac, at least
|
|
* not yet
|
|
*/
|
|
if (systemcfg->platform == PLATFORM_POWERMAC)
|
|
return -ENODEV;
|
|
|
|
/* fix up new node's linux_phandle field */
|
|
if ((ibm_phandle = (unsigned int *)get_property(node, "ibm,phandle", NULL)))
|
|
node->linux_phandle = *ibm_phandle;
|
|
|
|
out:
|
|
of_node_put(parent);
|
|
return err;
|
|
}
|
|
|
|
static int prom_reconfig_notifier(struct notifier_block *nb,
|
|
unsigned long action, void *node)
|
|
{
|
|
int err;
|
|
|
|
switch (action) {
|
|
case PSERIES_RECONFIG_ADD:
|
|
err = finish_node(node, NULL, of_finish_dynamic_node, 0, 0, 0);
|
|
if (err < 0) {
|
|
printk(KERN_ERR "finish_node returned %d\n", err);
|
|
err = NOTIFY_BAD;
|
|
}
|
|
break;
|
|
default:
|
|
err = NOTIFY_DONE;
|
|
break;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static struct notifier_block prom_reconfig_nb = {
|
|
.notifier_call = prom_reconfig_notifier,
|
|
.priority = 10, /* This one needs to run first */
|
|
};
|
|
|
|
static int __init prom_reconfig_setup(void)
|
|
{
|
|
return pSeries_reconfig_notifier_register(&prom_reconfig_nb);
|
|
}
|
|
__initcall(prom_reconfig_setup);
|
|
#endif
|
|
|
|
/*
|
|
* 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 (strcmp(pp->name, name) == 0) {
|
|
if (lenp != 0)
|
|
*lenp = pp->length;
|
|
return pp->value;
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(get_property);
|
|
|
|
/*
|
|
* Add a property to a node
|
|
*/
|
|
void 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
|
|
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: %x\n",
|
|
bus_space);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static struct resource *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.
|
|
*/
|
|
struct resource *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 found\n",
|
|
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;
|
|
}
|
|
EXPORT_SYMBOL(request_OF_resource);
|
|
|
|
int release_OF_resource(struct device_node *node, int index)
|
|
{
|
|
struct pci_dev* pcidev;
|
|
u8 pci_bus, pci_devfn;
|
|
unsigned long iomask, start, end;
|
|
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 "release_OF_resource(%s), parent not found\n",
|
|
node->name);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Find us in the parent and its childs */
|
|
res = parent->child;
|
|
start = node->addrs[index].address;
|
|
end = start + node->addrs[index].size - 1;
|
|
while (res) {
|
|
if (res->start == start && res->end == end &&
|
|
(res->flags & IORESOURCE_BUSY))
|
|
break;
|
|
if (res->start <= start && res->end >= end)
|
|
res = res->child;
|
|
else
|
|
res = res->sibling;
|
|
}
|
|
if (!res)
|
|
return -ENODEV;
|
|
|
|
if (res->name) {
|
|
kfree(res->name);
|
|
res->name = NULL;
|
|
}
|
|
release_resource(res);
|
|
kfree(res);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(release_OF_resource);
|