/*
* This program is free software; you can distribute it and/or modify it
* under the terms of the GNU General Public License (Version 2) as
* published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Copyright (C) 2004, 05, 06 MIPS Technologies, Inc.
* Elizabeth Clarke (beth@mips.com)
* Ralf Baechle (ralf@linux-mips.org)
* Copyright (C) 2006 Ralf Baechle (ralf@linux-mips.org)
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/cpumask.h>
#include <linux/interrupt.h>
#include <linux/compiler.h>
#include <asm/atomic.h>
#include <asm/cacheflush.h>
#include <asm/cpu.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/hardirq.h>
#include <asm/mmu_context.h>
#include <asm/smp.h>
#include <asm/time.h>
#include <asm/mipsregs.h>
#include <asm/mipsmtregs.h>
#include <asm/mips_mt.h>
#define MIPS_CPU_IPI_RESCHED_IRQ 0
#define MIPS_CPU_IPI_CALL_IRQ 1
static int cpu_ipi_resched_irq, cpu_ipi_call_irq;
#if 0
static void dump_mtregisters(int vpe, int tc)
{
printk("vpe %d tc %d\n", vpe, tc);
settc(tc);
printk(" c0 status 0x%lx\n", read_vpe_c0_status());
printk(" vpecontrol 0x%lx\n", read_vpe_c0_vpecontrol());
printk(" vpeconf0 0x%lx\n", read_vpe_c0_vpeconf0());
printk(" tcstatus 0x%lx\n", read_tc_c0_tcstatus());
printk(" tcrestart 0x%lx\n", read_tc_c0_tcrestart());
printk(" tcbind 0x%lx\n", read_tc_c0_tcbind());
printk(" tchalt 0x%lx\n", read_tc_c0_tchalt());
}
#endif
void __init sanitize_tlb_entries(void)
{
int i, tlbsiz;
unsigned long mvpconf0, ncpu;
if (!cpu_has_mipsmt)
return;
/* Enable VPC */
set_c0_mvpcontrol(MVPCONTROL_VPC);
back_to_back_c0_hazard();
/* Disable TLB sharing */
clear_c0_mvpcontrol(MVPCONTROL_STLB);
mvpconf0 = read_c0_mvpconf0();
printk(KERN_INFO "MVPConf0 0x%lx TLBS %lx PTLBE %ld\n", mvpconf0,
(mvpconf0 & MVPCONF0_TLBS) >> MVPCONF0_TLBS_SHIFT,
(mvpconf0 & MVPCONF0_PTLBE) >> MVPCONF0_PTLBE_SHIFT);
tlbsiz = (mvpconf0 & MVPCONF0_PTLBE) >> MVPCONF0_PTLBE_SHIFT;
ncpu = ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
printk(" tlbsiz %d ncpu %ld\n", tlbsiz, ncpu);
if (tlbsiz > 0) {
/* share them out across the vpe's */
tlbsiz /= ncpu;
printk(KERN_INFO "setting Config1.MMU_size to %d\n", tlbsiz);
for (i = 0; i < ncpu; i++) {
settc(i);
if (i == 0)
write_c0_config1((read_c0_config1() & ~(0x3f << 25)) | (tlbsiz << 25));
else
write_vpe_c0_config1((read_vpe_c0_config1() & ~(0x3f << 25)) |
(tlbsiz << 25));
}
}
clear_c0_mvpcontrol(MVPCONTROL_VPC);
}
static void ipi_resched_dispatch(void)
{
do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ);
}
static void ipi_call_dispatch(void)
{
do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ);
}
static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
{
return IRQ_HANDLED;
}
static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
{
smp_call_function_interrupt();
return IRQ_HANDLED;
}
static struct irqaction irq_resched = {
.handler = ipi_resched_interrupt,
.flags = IRQF_DISABLED|IRQF_PERCPU,
.name = "IPI_resched"
};
static struct irqaction irq_call = {
.handler = ipi_call_interrupt,
.flags = IRQF_DISABLED|IRQF_PERCPU,
.name = "IPI_call"
};
static void __init smp_copy_vpe_config(void)
{
write_vpe_c0_status(
(read_c0_status() & ~(ST0_IM | ST0_IE | ST0_KSU)) | ST0_CU0);
/* set config to be the same as vpe0, particularly kseg0 coherency alg */
write_vpe_c0_config( read_c0_config());
/* make sure there are no software interrupts pending */
write_vpe_c0_cause(0);
/* Propagate Config7 */
write_vpe_c0_config7(read_c0_config7());
write_vpe_c0_count(read_c0_count());
}
static unsigned int __init smp_vpe_init(unsigned int tc, unsigned int mvpconf0,
unsigned int ncpu)
{
if (tc > ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT))
return ncpu;
/* Deactivate all but VPE 0 */
if (tc != 0) {
unsigned long tmp = read_vpe_c0_vpeconf0();
tmp &= ~VPECONF0_VPA;
/* master VPE */
tmp |= VPECONF0_MVP;
write_vpe_c0_vpeconf0(tmp);
/* Record this as available CPU */
cpu_set(tc, phys_cpu_present_map);
__cpu_number_map[tc] = ++ncpu;
__cpu_logical_map[ncpu] = tc;
}
/* Disable multi-threading with TC's */
write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
if (tc != 0)
smp_copy_vpe_config();
return ncpu;
}
static void __init smp_tc_init(unsigned int tc, unsigned int mvpconf0)
{
unsigned long tmp;
if (!tc)
return;
/* bind a TC to each VPE, May as well put all excess TC's
on the last VPE */
if (tc >= (((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)+1))
write_tc_c0_tcbind(read_tc_c0_tcbind() | ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT));
else {
write_tc_c0_tcbind(read_tc_c0_tcbind() | tc);
/* and set XTC */
write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | (tc << VPECONF0_XTC_SHIFT));
}
tmp = read_tc_c0_tcstatus();
/* mark not allocated and not dynamically allocatable */
tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
tmp |= TCSTATUS_IXMT; /* interrupt exempt */
write_tc_c0_tcstatus(tmp);
write_tc_c0_tchalt(TCHALT_H);
}
/*
* Common setup before any secondaries are started
* Make sure all CPU's are in a sensible state before we boot any of the
* secondarys
*/
void __init plat_smp_setup(void)
{
unsigned int mvpconf0, ntc, tc, ncpu = 0;
#ifdef CONFIG_MIPS_MT_FPAFF
/* If we have an FPU, enroll ourselves in the FPU-full mask */
if (cpu_has_fpu)
cpu_set(0, mt_fpu_cpumask);
#endif /* CONFIG_MIPS_MT_FPAFF */
if (!cpu_has_mipsmt)
return;
/* disable MT so we can configure */
dvpe();
dmt();
/* Put MVPE's into 'configuration state' */
set_c0_mvpcontrol(MVPCONTROL_VPC);
mvpconf0 = read_c0_mvpconf0();
ntc = (mvpconf0 & MVPCONF0_PTC) >> MVPCONF0_PTC_SHIFT;
/* we'll always have more TC's than VPE's, so loop setting everything
to a sensible state */
for (tc = 0; tc <= ntc; tc++) {
settc(tc);
smp_tc_init(tc, mvpconf0);
ncpu = smp_vpe_init(tc, mvpconf0, ncpu);
}
/* Release config state */
clear_c0_mvpcontrol(MVPCONTROL_VPC);
/* We'll wait until starting the secondaries before starting MVPE */
printk(KERN_INFO "Detected %i available secondary CPU(s)\n", ncpu);
}
void __init plat_prepare_cpus(unsigned int max_cpus)
{
mips_mt_set_cpuoptions();
/* set up ipi interrupts */
if (cpu_has_vint) {
set_vi_handler(MIPS_CPU_IPI_RESCHED_IRQ, ipi_resched_dispatch);
set_vi_handler(MIPS_CPU_IPI_CALL_IRQ, ipi_call_dispatch);
}
cpu_ipi_resched_irq = MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ;
cpu_ipi_call_irq = MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ;
setup_irq(cpu_ipi_resched_irq, &irq_resched);
setup_irq(cpu_ipi_call_irq, &irq_call);
set_irq_handler(cpu_ipi_resched_irq, handle_percpu_irq);
set_irq_handler(cpu_ipi_call_irq, handle_percpu_irq);
}
/*
* Setup the PC, SP, and GP of a secondary processor and start it
* running!
* smp_bootstrap is the place to resume from
* __KSTK_TOS(idle) is apparently the stack pointer
* (unsigned long)idle->thread_info the gp
* assumes a 1:1 mapping of TC => VPE
*/
void prom_boot_secondary(int cpu, struct task_struct *idle)
{
struct thread_info *gp = task_thread_info(idle);
dvpe();
set_c0_mvpcontrol(MVPCONTROL_VPC);
settc(cpu);
/* restart */
write_tc_c0_tcrestart((unsigned long)&smp_bootstrap);
/* enable the tc this vpe/cpu will be running */
write_tc_c0_tcstatus((read_tc_c0_tcstatus() & ~TCSTATUS_IXMT) | TCSTATUS_A);
write_tc_c0_tchalt(0);
/* enable the VPE */
write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
/* stack pointer */
write_tc_gpr_sp( __KSTK_TOS(idle));
/* global pointer */
write_tc_gpr_gp((unsigned long)gp);
flush_icache_range((unsigned long)gp,
(unsigned long)(gp + sizeof(struct thread_info)));
/* finally out of configuration and into chaos */
clear_c0_mvpcontrol(MVPCONTROL_VPC);
evpe(EVPE_ENABLE);
}
void prom_init_secondary(void)
{
/* Enable per-cpu interrupts */
/* This is Malta specific: IPI,performance and timer inetrrupts */
write_c0_status((read_c0_status() & ~ST0_IM ) |
(STATUSF_IP0 | STATUSF_IP1 | STATUSF_IP6 | STATUSF_IP7));
}
void prom_smp_finish(void)
{
write_c0_compare(read_c0_count() + (8* mips_hpt_frequency/HZ));
#ifdef CONFIG_MIPS_MT_FPAFF
/* If we have an FPU, enroll ourselves in the FPU-full mask */
if (cpu_has_fpu)
cpu_set(smp_processor_id(), mt_fpu_cpumask);
#endif /* CONFIG_MIPS_MT_FPAFF */
local_irq_enable();
}
void prom_cpus_done(void)
{
}
void core_send_ipi(int cpu, unsigned int action)
{
int i;
unsigned long flags;
int vpflags;
local_irq_save (flags);
vpflags = dvpe(); /* cant access the other CPU's registers whilst MVPE enabled */
switch (action) {
case SMP_CALL_FUNCTION:
i = C_SW1;
break;
case SMP_RESCHEDULE_YOURSELF:
default:
i = C_SW0;
break;
}
/* 1:1 mapping of vpe and tc... */
settc(cpu);
write_vpe_c0_cause(read_vpe_c0_cause() | i);
evpe(vpflags);
local_irq_restore(flags);
}
