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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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.
*/
#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 const struct of_device_id iss4xx_of_bus[] __initconst = {
{ .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 smp_iss4xx_setup_cpu(int cpu)
{
mpic_setup_this_cpu();
}
static int 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)
{
if (!of_machine_is_compatible("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,
};
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