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// SPDX-License-Identifier: GPL-2.0
/* leon_smp.c: Sparc-Leon SMP support.
*
* based on sun4m_smp.c
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
* Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
*/
#include <asm/head.h>
#include <linux/kernel.h>
#include <linux/sched/mm.h>
#include <linux/threads.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/profile.h>
#include <linux/pm.h>
#include <linux/delay.h>
#include <linux/gfp.h>
#include <linux/cpu.h>
#include <linux/clockchips.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/ptrace.h>
#include <linux/atomic.h>
#include <asm/irq_regs.h>
#include <asm/traps.h>
#include <asm/delay.h>
#include <asm/irq.h>
#include <asm/page.h>
#include <asm/oplib.h>
#include <asm/cpudata.h>
#include <asm/asi.h>
#include <asm/leon.h>
#include <asm/leon_amba.h>
#include <asm/timer.h>
#include "kernel.h"
#include "irq.h"
extern ctxd_t *srmmu_ctx_table_phys;
static int smp_processors_ready;
extern volatile unsigned long cpu_callin_map[NR_CPUS];
extern cpumask_t smp_commenced_mask;
void leon_configure_cache_smp(void);
static void leon_ipi_init(void);
/* IRQ number of LEON IPIs */
int leon_ipi_irq = LEON3_IRQ_IPI_DEFAULT;
static inline unsigned long do_swap(volatile unsigned long *ptr,
unsigned long val)
{
__asm__ __volatile__("swapa [%2] %3, %0\n\t" : "=&r"(val)
: "0"(val), "r"(ptr), "i"(ASI_LEON_DCACHE_MISS)
: "memory");
return val;
}
void leon_cpu_pre_starting(void *arg)
{
leon_configure_cache_smp();
}
void leon_cpu_pre_online(void *arg)
{
int cpuid = hard_smp_processor_id();
/* Allow master to continue. The master will then give us the
* go-ahead by setting the smp_commenced_mask and will wait without
* timeouts until our setup is completed fully (signified by
* our bit being set in the cpu_online_mask).
*/
do_swap(&cpu_callin_map[cpuid], 1);
local_ops->cache_all();
local_ops->tlb_all();
/* Fix idle thread fields. */
__asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(¤t_set[cpuid])
: "memory" /* paranoid */);
/* Attach to the address space of init_task. */
mmgrab(&init_mm);
current->active_mm = &init_mm;
while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
mb();
}
/*
* Cycle through the processors asking the PROM to start each one.
*/
extern struct linux_prom_registers smp_penguin_ctable;
void leon_configure_cache_smp(void)
{
unsigned long cfg = sparc_leon3_get_dcachecfg();
int me = smp_processor_id();
if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) {
printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n",
(unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg),
(unsigned int)cfg, (unsigned int)me);
sparc_leon3_disable_cache();
} else {
if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) {
sparc_leon3_enable_snooping();
} else {
printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n",
me);
sparc_leon3_disable_cache();
}
}
local_ops->cache_all();
local_ops->tlb_all();
}
static void leon_smp_setbroadcast(unsigned int mask)
{
int broadcast =
((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
LEON3_IRQMPSTATUS_BROADCAST) & 1);
if (!broadcast) {
prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n",
leon_smp_nrcpus());
if (leon_smp_nrcpus() > 1) {
BUG();
} else {
prom_printf("continue anyway\n");
return;
}
}
LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask);
}
int leon_smp_nrcpus(void)
{
int nrcpu =
((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1;
return nrcpu;
}
void __init leon_boot_cpus(void)
{
int nrcpu = leon_smp_nrcpus();
int me = smp_processor_id();
/* Setup IPI */
leon_ipi_init();
printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x\n", (unsigned int)me,
(unsigned int)nrcpu, (unsigned int)NR_CPUS,
(unsigned int)&(leon3_irqctrl_regs->mpstatus));
leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me);
leon_enable_irq_cpu(LEON3_IRQ_TICKER, me);
leon_enable_irq_cpu(leon_ipi_irq, me);
leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER);
leon_configure_cache_smp();
local_ops->cache_all();
}
int leon_boot_one_cpu(int i, struct task_struct *idle)
{
int timeout;
current_set[i] = task_thread_info(idle);
/* See trampoline.S:leon_smp_cpu_startup for details...
* Initialize the contexts table
* Since the call to prom_startcpu() trashes the structure,
* we need to re-initialize it for each cpu
*/
smp_penguin_ctable.which_io = 0;
smp_penguin_ctable.phys_addr = (unsigned int)srmmu_ctx_table_phys;
smp_penguin_ctable.reg_size = 0;
/* whirrr, whirrr, whirrrrrrrrr... */
printk(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i,
(unsigned int)&leon3_irqctrl_regs->mpstatus);
local_ops->cache_all();
/* Make sure all IRQs are of from the start for this new CPU */
LEON_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[i], 0);
/* Wake one CPU */
LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i);
/* wheee... it's going... */
for (timeout = 0; timeout < 10000; timeout++) {
if (cpu_callin_map[i])
break;
udelay(200);
}
printk(KERN_INFO "Started CPU %d\n", (unsigned int)i);
if (!(cpu_callin_map[i])) {
printk(KERN_ERR "Processor %d is stuck.\n", i);
return -ENODEV;
} else {
leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i);
leon_enable_irq_cpu(LEON3_IRQ_TICKER, i);
leon_enable_irq_cpu(leon_ipi_irq, i);
}
local_ops->cache_all();
return 0;
}
void __init leon_smp_done(void)
{
int i, first;
int *prev;
/* setup cpu list for irq rotation */
first = 0;
prev = &first;
for (i = 0; i < NR_CPUS; i++) {
if (cpu_online(i)) {
*prev = i;
prev = &cpu_data(i).next;
}
}
*prev = first;
local_ops->cache_all();
/* Free unneeded trap tables */
if (!cpu_present(1)) {
free_reserved_page(virt_to_page(&trapbase_cpu1));
}
if (!cpu_present(2)) {
free_reserved_page(virt_to_page(&trapbase_cpu2));
}
if (!cpu_present(3)) {
free_reserved_page(virt_to_page(&trapbase_cpu3));
}
/* Ok, they are spinning and ready to go. */
smp_processors_ready = 1;
}
struct leon_ipi_work {
int single;
int msk;
int resched;
};
static DEFINE_PER_CPU_SHARED_ALIGNED(struct leon_ipi_work, leon_ipi_work);
/* Initialize IPIs on the LEON, in order to save IRQ resources only one IRQ
* is used for all three types of IPIs.
*/
static void __init leon_ipi_init(void)
{
int cpu, len;
struct leon_ipi_work *work;
struct property *pp;
struct device_node *rootnp;
struct tt_entry *trap_table;
unsigned long flags;
/* Find IPI IRQ or stick with default value */
rootnp = of_find_node_by_path("/ambapp0");
if (rootnp) {
pp = of_find_property(rootnp, "ipi_num", &len);
if (pp && (*(int *)pp->value))
leon_ipi_irq = *(int *)pp->value;
}
printk(KERN_INFO "leon: SMP IPIs at IRQ %d\n", leon_ipi_irq);
/* Adjust so that we jump directly to smpleon_ipi */
local_irq_save(flags);
trap_table
|