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323 lines
7.2 KiB
323 lines
7.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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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* Adapted for sparc32 by David S. Miller [email protected] |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/types.h> |
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#include <linux/string.h> |
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#include <linux/mm.h> |
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#include <linux/memblock.h> |
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#include <asm/prom.h> |
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#include <asm/oplib.h> |
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#include <asm/leon.h> |
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#include <asm/leon_amba.h> |
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#include "prom.h" |
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void * __init prom_early_alloc(unsigned long size) |
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{ |
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void *ret; |
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ret = memblock_alloc(size, SMP_CACHE_BYTES); |
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if (!ret) |
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panic("%s: Failed to allocate %lu bytes\n", __func__, size); |
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prom_early_allocated += size; |
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return ret; |
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} |
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/* The following routines deal with the black magic of fully naming a |
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* node. |
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* |
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* Certain well known named nodes are just the simple name string. |
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* |
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* Actual devices have an address specifier appended to the base name |
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* string, like this "foo@addr". The "addr" can be in any number of |
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* formats, and the platform plus the type of the node determine the |
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* format and how it is constructed. |
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* |
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* For children of the ROOT node, the naming convention is fixed and |
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* determined by whether this is a sun4u or sun4v system. |
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* |
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* For children of other nodes, it is bus type specific. So |
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* we walk up the tree until we discover a "device_type" property |
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* we recognize and we go from there. |
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*/ |
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static void __init sparc32_path_component(struct device_node *dp, char *tmp_buf) |
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{ |
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const char *name = of_get_property(dp, "name", NULL); |
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struct linux_prom_registers *regs; |
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struct property *rprop; |
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rprop = of_find_property(dp, "reg", NULL); |
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if (!rprop) |
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return; |
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regs = rprop->value; |
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sprintf(tmp_buf, "%s@%x,%x", |
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name, |
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regs->which_io, regs->phys_addr); |
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} |
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/* "name@slot,offset" */ |
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static void __init sbus_path_component(struct device_node *dp, char *tmp_buf) |
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{ |
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const char *name = of_get_property(dp, "name", NULL); |
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struct linux_prom_registers *regs; |
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struct property *prop; |
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prop = of_find_property(dp, "reg", NULL); |
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if (!prop) |
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return; |
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regs = prop->value; |
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sprintf(tmp_buf, "%s@%x,%x", |
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name, |
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regs->which_io, |
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regs->phys_addr); |
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} |
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/* "name@devnum[,func]" */ |
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static void __init pci_path_component(struct device_node *dp, char *tmp_buf) |
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{ |
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const char *name = of_get_property(dp, "name", NULL); |
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struct linux_prom_pci_registers *regs; |
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struct property *prop; |
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unsigned int devfn; |
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prop = of_find_property(dp, "reg", NULL); |
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if (!prop) |
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return; |
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regs = prop->value; |
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devfn = (regs->phys_hi >> 8) & 0xff; |
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if (devfn & 0x07) { |
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sprintf(tmp_buf, "%s@%x,%x", |
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name, |
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devfn >> 3, |
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devfn & 0x07); |
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} else { |
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sprintf(tmp_buf, "%s@%x", |
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name, |
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devfn >> 3); |
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} |
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} |
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/* "name@addrhi,addrlo" */ |
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static void __init ebus_path_component(struct device_node *dp, char *tmp_buf) |
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{ |
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const char *name = of_get_property(dp, "name", NULL); |
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struct linux_prom_registers *regs; |
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struct property *prop; |
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prop = of_find_property(dp, "reg", NULL); |
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if (!prop) |
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return; |
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regs = prop->value; |
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sprintf(tmp_buf, "%s@%x,%x", |
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name, |
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regs->which_io, regs->phys_addr); |
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} |
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/* "name@irq,addrlo" */ |
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static void __init ambapp_path_component(struct device_node *dp, char *tmp_buf) |
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{ |
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const char *name = of_get_property(dp, "name", NULL); |
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struct amba_prom_registers *regs; |
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unsigned int *intr; |
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unsigned int reg0; |
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struct property *prop; |
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int interrupt = 0; |
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/* In order to get a unique ID in the device tree (multiple AMBA devices |
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* may have the same name) the node number is printed |
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*/ |
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prop = of_find_property(dp, "reg", NULL); |
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if (!prop) { |
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reg0 = (unsigned int)dp->phandle; |
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} else { |
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regs = prop->value; |
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reg0 = regs->phys_addr; |
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} |
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/* Not all cores have Interrupt */ |
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prop = of_find_property(dp, "interrupts", NULL); |
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if (!prop) |
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intr = &interrupt; /* IRQ0 does not exist */ |
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else |
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intr = prop->value; |
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sprintf(tmp_buf, "%s@%x,%x", name, *intr, reg0); |
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} |
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static void __init __build_path_component(struct device_node *dp, char *tmp_buf) |
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{ |
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struct device_node *parent = dp->parent; |
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if (parent != NULL) { |
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if (of_node_is_type(parent, "pci") || |
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of_node_is_type(parent, "pciex")) |
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return pci_path_component(dp, tmp_buf); |
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if (of_node_is_type(parent, "sbus")) |
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return sbus_path_component(dp, tmp_buf); |
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if (of_node_is_type(parent, "ebus")) |
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return ebus_path_component(dp, tmp_buf); |
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if (of_node_is_type(parent, "ambapp")) |
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return ambapp_path_component(dp, tmp_buf); |
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/* "isa" is handled with platform naming */ |
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} |
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/* Use platform naming convention. */ |
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return sparc32_path_component(dp, tmp_buf); |
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} |
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char * __init build_path_component(struct device_node *dp) |
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{ |
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const char *name = of_get_property(dp, "name", NULL); |
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char tmp_buf[64], *n; |
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tmp_buf[0] = '\0'; |
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__build_path_component(dp, tmp_buf); |
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if (tmp_buf[0] == '\0') |
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strcpy(tmp_buf, name); |
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n = prom_early_alloc(strlen(tmp_buf) + 1); |
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strcpy(n, tmp_buf); |
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return n; |
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} |
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extern void restore_current(void); |
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void __init of_console_init(void) |
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{ |
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char *msg = "OF stdout device is: %s\n"; |
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struct device_node *dp; |
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unsigned long flags; |
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const char *type; |
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phandle node; |
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int skip, tmp, fd; |
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of_console_path = prom_early_alloc(256); |
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switch (prom_vers) { |
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case PROM_V0: |
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skip = 0; |
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switch (*romvec->pv_stdout) { |
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case PROMDEV_SCREEN: |
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type = "display"; |
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break; |
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case PROMDEV_TTYB: |
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skip = 1; |
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fallthrough; |
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case PROMDEV_TTYA: |
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type = "serial"; |
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break; |
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default: |
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prom_printf("Invalid PROM_V0 stdout value %u\n", |
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*romvec->pv_stdout); |
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prom_halt(); |
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} |
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tmp = skip; |
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for_each_node_by_type(dp, type) { |
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if (!tmp--) |
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break; |
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} |
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if (!dp) { |
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prom_printf("Cannot find PROM_V0 console node.\n"); |
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prom_halt(); |
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} |
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of_console_device = dp; |
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sprintf(of_console_path, "%pOF", dp); |
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if (!strcmp(type, "serial")) { |
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strcat(of_console_path, |
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(skip ? ":b" : ":a")); |
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} |
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break; |
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default: |
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case PROM_V2: |
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case PROM_V3: |
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fd = *romvec->pv_v2bootargs.fd_stdout; |
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spin_lock_irqsave(&prom_lock, flags); |
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node = (*romvec->pv_v2devops.v2_inst2pkg)(fd); |
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restore_current(); |
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spin_unlock_irqrestore(&prom_lock, flags); |
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if (!node) { |
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prom_printf("Cannot resolve stdout node from " |
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"instance %08x.\n", fd); |
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prom_halt(); |
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} |
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dp = of_find_node_by_phandle(node); |
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if (!of_node_is_type(dp, "display") && |
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!of_node_is_type(dp, "serial")) { |
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prom_printf("Console device_type is neither display " |
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"nor serial.\n"); |
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prom_halt(); |
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} |
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of_console_device = dp; |
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if (prom_vers == PROM_V2) { |
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sprintf(of_console_path, "%pOF", dp); |
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switch (*romvec->pv_stdout) { |
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case PROMDEV_TTYA: |
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strcat(of_console_path, ":a"); |
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break; |
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case PROMDEV_TTYB: |
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strcat(of_console_path, ":b"); |
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break; |
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} |
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} else { |
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const char *path; |
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dp = of_find_node_by_path("/"); |
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path = of_get_property(dp, "stdout-path", NULL); |
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if (!path) { |
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prom_printf("No stdout-path in root node.\n"); |
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prom_halt(); |
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} |
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strcpy(of_console_path, path); |
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} |
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break; |
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} |
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of_console_options = strrchr(of_console_path, ':'); |
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if (of_console_options) { |
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of_console_options++; |
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if (*of_console_options == '\0') |
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of_console_options = NULL; |
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} |
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printk(msg, of_console_path); |
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} |
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void __init of_fill_in_cpu_data(void) |
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{ |
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} |
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void __init irq_trans_init(struct device_node *dp) |
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{ |
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}
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