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/*
* Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
* reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the NetLogic
* license below:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/irq.h>
#include <asm/mmu_context.h>
#include <asm/netlogic/interrupt.h>
#include <asm/netlogic/mips-extns.h>
#include <asm/netlogic/xlr/iomap.h>
#include <asm/netlogic/xlr/pic.h>
#include <asm/netlogic/xlr/xlr.h>
void core_send_ipi(int logical_cpu, unsigned int action)
{
int cpu = cpu_logical_map(logical_cpu);
u32 tid = cpu & 0x3;
u32 pid = (cpu >> 2) & 0x07;
u32 ipi = (tid << 16) | (pid << 20);
if (action & SMP_CALL_FUNCTION)
ipi |= IRQ_IPI_SMP_FUNCTION;
else if (action & SMP_RESCHEDULE_YOURSELF)
ipi |= IRQ_IPI_SMP_RESCHEDULE;
else
return;
pic_send_ipi(ipi);
}
void nlm_send_ipi_single(int cpu, unsigned int action)
{
core_send_ipi(cpu, action);
}
void nlm_send_ipi_mask(const struct cpumask *mask, unsigned int action)
{
int cpu;
for_each_cpu(cpu, mask) {
core_send_ipi(cpu, action);
}
}
/* IRQ_IPI_SMP_FUNCTION Handler */
void nlm_smp_function_ipi_handler(unsigned int irq, struct irq_desc *desc)
{
smp_call_function_interrupt();
}
/* IRQ_IPI_SMP_RESCHEDULE handler */
void nlm_smp_resched_ipi_handler(unsigned int irq, struct irq_desc *desc)
{
set_need_resched();
}
void nlm_common_ipi_handler(int irq, struct pt_regs *regs)
{
if (irq == IRQ_IPI_SMP_FUNCTION) {
smp_call_function_interrupt();
} else {
/* Announce that we are for reschduling */
set_need_resched();
}
}
/*
* Called before going into mips code, early cpu init
*/
void nlm_early_init_secondary(void)
{
write_c0_ebase((uint32_t)nlm_common_ebase);
/* TLB partition here later */
}
/*
* Code to run on secondary just after probing the CPU
*/
static void __cpuinit nlm_init_secondary(void)
{
nlm_smp_irq_init();
}
void nlm_smp_finish(void)
{
#ifdef notyet
nlm_common_msgring_cpu_init();
#endif
}
void nlm_cpus_done(void)
{
}
/*
* Boot all other cpus in the system, initialize them, and bring them into
* the boot function
*/
int nlm_cpu_unblock[NR_CPUS];
int nlm_cpu_ready[NR_CPUS];
unsigned long nlm_next_gp;
unsigned long nlm_next_sp;
cpumask_t phys_cpu_present_map;
void nlm_boot_secondary(int logical_cpu, struct task_struct *idle)
{
unsigned long gp = (unsigned long)task_thread_info(idle);
unsigned long sp = (unsigned long)__KSTK_TOS(idle);
int cpu = cpu_logical_map(logical_cpu);
nlm_next_sp = sp;
nlm_next_gp = gp;
/* barrier */
__sync();
nlm_cpu_unblock[cpu] = 1;
}
void __init nlm_smp_setup(void)
{
unsigned int boot_cpu;
int num_cpus, i;
boot_cpu = hard_smp_processor_id();
cpus_clear(phys_cpu_present_map);
cpu_set(boot_cpu, phys_cpu_present_map);
__cpu_number_map[boot_cpu] = 0;
__cpu_logical_map[0] = boot_cpu;
cpu_set(0, cpu_possible_map);
num_cpus = 1;
for (i = 0; i < NR_CPUS; i++) {
if (nlm_cpu_ready[i]) {
cpu_set(i, phys_cpu_present_map);
__cpu_number_map[i] = num_cpus;
__cpu_logical_map[num_cpus] = i;
cpu_set(num_cpus, cpu_possible_map);
++num_cpus;
}
}
pr_info("Phys CPU present map: %lx, possible map %lx\n",
(unsigned long)phys_cpu_present_map.bits[0],
(unsigned long)cpu_possible_map.bits[0]);
pr_info("Detected %i Slave CPU(s)\n", num_cpus);
}
void nlm_prepare_cpus(unsigned int max_cpus)
{
}
struct plat_smp_ops nlm_smp_ops = {
.send_ipi_single = nlm_send_ipi_single,
.send_ipi_mask = nlm_send_ipi_mask,
.init_secondary = nlm_init_secondary,
.smp_finish = nlm_smp_finish,
.cpus_done = nlm_cpus_done,
.boot_secondary = nlm_boot_secondary,
.smp_setup = nlm_smp_setup,
.prepare_cpus = nlm_prepare_cpus,
};
unsigned long secondary_entry_point;
int nlm_wakeup_secondary_cpus(u32 wakeup_mask)
{
unsigned int tid, pid, ipi, i, boot_cpu;
void *reset_vec;
secondary_entry_point = (unsigned long)prom_pre_boot_secondary_cpus;
reset_vec = (void *)CKSEG1ADDR(0x1fc00000);
memcpy(reset_vec, nlm_boot_smp_nmi, 0x80);
boot_cpu = hard_smp_processor_id();
for (i = 0; i < NR_CPUS; i++) {
if (i == boot_cpu)
continue;
if (wakeup_mask & (1u << i)) {
tid = i & 0x3;
pid = (i >> 2) & 0x7;
ipi = (tid << 16) | (pid << 20) | (1 << 8);
pic_send_ipi(ipi);
}
}
return 0;
}
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