mirror of https://gitee.com/openkylin/linux.git
169 lines
4.3 KiB
C
169 lines
4.3 KiB
C
/*
|
|
* PPC476 board specific routines
|
|
*
|
|
* Copyright 2010 Torez Smith, IBM Corporation.
|
|
*
|
|
* Based on earlier code:
|
|
* Matt Porter <mporter@kernel.crashing.org>
|
|
* Copyright 2002-2005 MontaVista Software Inc.
|
|
*
|
|
* Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
|
|
* Copyright (c) 2003-2005 Zultys Technologies
|
|
*
|
|
* Rewritten and ported to the merged powerpc tree:
|
|
* Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/rtc.h>
|
|
|
|
#include <asm/machdep.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/udbg.h>
|
|
#include <asm/time.h>
|
|
#include <asm/uic.h>
|
|
#include <asm/ppc4xx.h>
|
|
#include <asm/mpic.h>
|
|
#include <asm/mmu.h>
|
|
|
|
static __initdata struct of_device_id iss4xx_of_bus[] = {
|
|
{ .compatible = "ibm,plb4", },
|
|
{ .compatible = "ibm,plb6", },
|
|
{ .compatible = "ibm,opb", },
|
|
{ .compatible = "ibm,ebc", },
|
|
{},
|
|
};
|
|
|
|
static int __init iss4xx_device_probe(void)
|
|
{
|
|
of_platform_bus_probe(NULL, iss4xx_of_bus, NULL);
|
|
of_instantiate_rtc();
|
|
|
|
return 0;
|
|
}
|
|
machine_device_initcall(iss4xx, iss4xx_device_probe);
|
|
|
|
/* We can have either UICs or MPICs */
|
|
static void __init iss4xx_init_irq(void)
|
|
{
|
|
struct device_node *np;
|
|
|
|
/* Find top level interrupt controller */
|
|
for_each_node_with_property(np, "interrupt-controller") {
|
|
if (of_get_property(np, "interrupts", NULL) == NULL)
|
|
break;
|
|
}
|
|
if (np == NULL)
|
|
panic("Can't find top level interrupt controller");
|
|
|
|
/* Check type and do appropriate initialization */
|
|
if (of_device_is_compatible(np, "ibm,uic")) {
|
|
uic_init_tree();
|
|
ppc_md.get_irq = uic_get_irq;
|
|
#ifdef CONFIG_MPIC
|
|
} else if (of_device_is_compatible(np, "chrp,open-pic")) {
|
|
/* The MPIC driver will get everything it needs from the
|
|
* device-tree, just pass 0 to all arguments
|
|
*/
|
|
struct mpic *mpic = mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC ");
|
|
BUG_ON(mpic == NULL);
|
|
mpic_init(mpic);
|
|
ppc_md.get_irq = mpic_get_irq;
|
|
#endif
|
|
} else
|
|
panic("Unrecognized top level interrupt controller");
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
static void __cpuinit smp_iss4xx_setup_cpu(int cpu)
|
|
{
|
|
mpic_setup_this_cpu();
|
|
}
|
|
|
|
static int __cpuinit smp_iss4xx_kick_cpu(int cpu)
|
|
{
|
|
struct device_node *cpunode = of_get_cpu_node(cpu, NULL);
|
|
const u64 *spin_table_addr_prop;
|
|
u32 *spin_table;
|
|
extern void start_secondary_47x(void);
|
|
|
|
BUG_ON(cpunode == NULL);
|
|
|
|
/* Assume spin table. We could test for the enable-method in
|
|
* the device-tree but currently there's little point as it's
|
|
* our only supported method
|
|
*/
|
|
spin_table_addr_prop = of_get_property(cpunode, "cpu-release-addr",
|
|
NULL);
|
|
if (spin_table_addr_prop == NULL) {
|
|
pr_err("CPU%d: Can't start, missing cpu-release-addr !\n", cpu);
|
|
return -ENOENT;
|
|
}
|
|
|
|
/* Assume it's mapped as part of the linear mapping. This is a bit
|
|
* fishy but will work fine for now
|
|
*/
|
|
spin_table = (u32 *)__va(*spin_table_addr_prop);
|
|
pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table);
|
|
|
|
spin_table[3] = cpu;
|
|
smp_wmb();
|
|
spin_table[1] = __pa(start_secondary_47x);
|
|
mb();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct smp_ops_t iss_smp_ops = {
|
|
.probe = smp_mpic_probe,
|
|
.message_pass = smp_mpic_message_pass,
|
|
.setup_cpu = smp_iss4xx_setup_cpu,
|
|
.kick_cpu = smp_iss4xx_kick_cpu,
|
|
.give_timebase = smp_generic_give_timebase,
|
|
.take_timebase = smp_generic_take_timebase,
|
|
};
|
|
|
|
static void __init iss4xx_smp_init(void)
|
|
{
|
|
if (mmu_has_feature(MMU_FTR_TYPE_47x))
|
|
smp_ops = &iss_smp_ops;
|
|
}
|
|
|
|
#else /* CONFIG_SMP */
|
|
static void __init iss4xx_smp_init(void) { }
|
|
#endif /* CONFIG_SMP */
|
|
|
|
static void __init iss4xx_setup_arch(void)
|
|
{
|
|
iss4xx_smp_init();
|
|
}
|
|
|
|
/*
|
|
* Called very early, MMU is off, device-tree isn't unflattened
|
|
*/
|
|
static int __init iss4xx_probe(void)
|
|
{
|
|
unsigned long root = of_get_flat_dt_root();
|
|
|
|
if (!of_flat_dt_is_compatible(root, "ibm,iss-4xx"))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
define_machine(iss4xx) {
|
|
.name = "ISS-4xx",
|
|
.probe = iss4xx_probe,
|
|
.progress = udbg_progress,
|
|
.init_IRQ = iss4xx_init_irq,
|
|
.setup_arch = iss4xx_setup_arch,
|
|
.restart = ppc4xx_reset_system,
|
|
.calibrate_decr = generic_calibrate_decr,
|
|
};
|