Orange Pi5 kernel

// 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"(&current_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 = &sparc_ttable[SP_TRAP_IRQ1 + (leon_ipi_irq - 1)];
<------>trap_table->inst_three += smpleon_ipi - real_irq_entry;
<------>local_ops->cache_all();
<------>local_irq_restore(flags);
 
<------>for_each_possible_cpu(cpu) {
<------><------>work = &per_cpu(leon_ipi_work, cpu);
<------><------>work->single = work->msk = work->resched = 0;
<------>}
}
 
static void leon_send_ipi(int cpu, int level)
{
<------>unsigned long mask;
<------>mask = leon_get_irqmask(level);
<------>LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
}
 
static void leon_ipi_single(int cpu)
{
<------>struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
 
<------>/* Mark work */
<------>work->single = 1;
 
<------>/* Generate IRQ on the CPU */
<------>leon_send_ipi(cpu, leon_ipi_irq);
}
 
static void leon_ipi_mask_one(int cpu)
{
<------>struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
 
<------>/* Mark work */
<------>work->msk = 1;
 
<------>/* Generate IRQ on the CPU */
<------>leon_send_ipi(cpu, leon_ipi_irq);
}
 
static void leon_ipi_resched(int cpu)
{
<------>struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
 
<------>/* Mark work */
<------>work->resched = 1;
 
<------>/* Generate IRQ on the CPU (any IRQ will cause resched) */
<------>leon_send_ipi(cpu, leon_ipi_irq);
}
 
void leonsmp_ipi_interrupt(void)
{
<------>struct leon_ipi_work *work = this_cpu_ptr(&leon_ipi_work);
 
<------>if (work->single) {
<------><------>work->single = 0;
<------><------>smp_call_function_single_interrupt();
<------>}
<------>if (work->msk) {
<------><------>work->msk = 0;
<------><------>smp_call_function_interrupt();
<------>}
<------>if (work->resched) {
<------><------>work->resched = 0;
<------><------>smp_resched_interrupt();
<------>}
}
 
static struct smp_funcall {
<------>smpfunc_t func;
<------>unsigned long arg1;
<------>unsigned long arg2;
<------>unsigned long arg3;
<------>unsigned long arg4;
<------>unsigned long arg5;
<------>unsigned long processors_in[NR_CPUS];	/* Set when ipi entered. */
<------>unsigned long processors_out[NR_CPUS];	/* Set when ipi exited. */
} ccall_info __attribute__((aligned(8)));
 
static DEFINE_SPINLOCK(cross_call_lock);
 
/* Cross calls must be serialized, at least currently. */
static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
<------><------><------>    unsigned long arg2, unsigned long arg3,
<------><------><------>    unsigned long arg4)
{
<------>if (smp_processors_ready) {
<------><------>register int high = NR_CPUS - 1;
<------><------>unsigned long flags;
 
<------><------>spin_lock_irqsave(&cross_call_lock, flags);
 
<------><------>{
<------><------><------>/* If you make changes here, make sure gcc generates proper code... */
<------><------><------>register smpfunc_t f asm("i0") = func;
<------><------><------>register unsigned long a1 asm("i1") = arg1;
<------><------><------>register unsigned long a2 asm("i2") = arg2;
<------><------><------>register unsigned long a3 asm("i3") = arg3;
<------><------><------>register unsigned long a4 asm("i4") = arg4;
<------><------><------>register unsigned long a5 asm("i5") = 0;
 
<------><------><------>__asm__ __volatile__("std %0, [%6]\n\t"
<------><------><------><------><------>     "std %2, [%6 + 8]\n\t"
<------><------><------><------><------>     "std %4, [%6 + 16]\n\t" : :
<------><------><------><------><------>     "r"(f), "r"(a1), "r"(a2), "r"(a3),
<------><------><------><------><------>     "r"(a4), "r"(a5),
<------><------><------><------><------>     "r"(&ccall_info.func));
<------><------>}
 
<------><------>/* Init receive/complete mapping, plus fire the IPI's off. */
<------><------>{
<------><------><------>register int i;
 
<------><------><------>cpumask_clear_cpu(smp_processor_id(), &mask);
<------><------><------>cpumask_and(&mask, cpu_online_mask, &mask);
<------><------><------>for (i = 0; i <= high; i++) {
<------><------><------><------>if (cpumask_test_cpu(i, &mask)) {
<------><------><------><------><------>ccall_info.processors_in[i] = 0;
<------><------><------><------><------>ccall_info.processors_out[i] = 0;
<------><------><------><------><------>leon_send_ipi(i, LEON3_IRQ_CROSS_CALL);
 
<------><------><------><------>}
<------><------><------>}
<------><------>}
 
<------><------>{
<------><------><------>register int i;
 
<------><------><------>i = 0;
<------><------><------>do {
<------><------><------><------>if (!cpumask_test_cpu(i, &mask))
<------><------><------><------><------>continue;
 
<------><------><------><------>while (!ccall_info.processors_in[i])
<------><------><------><------><------>barrier();
<------><------><------>} while (++i <= high);
 
<------><------><------>i = 0;
<------><------><------>do {
<------><------><------><------>if (!cpumask_test_cpu(i, &mask))
<------><------><------><------><------>continue;
 
<------><------><------><------>while (!ccall_info.processors_out[i])
<------><------><------><------><------>barrier();
<------><------><------>} while (++i <= high);
<------><------>}
 
<------><------>spin_unlock_irqrestore(&cross_call_lock, flags);
<------>}
}
 
/* Running cross calls. */
void leon_cross_call_irq(void)
{
<------>int i = smp_processor_id();
 
<------>ccall_info.processors_in[i] = 1;
<------>ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
<------><------><------>ccall_info.arg4, ccall_info.arg5);
<------>ccall_info.processors_out[i] = 1;
}
 
static const struct sparc32_ipi_ops leon_ipi_ops = {
<------>.cross_call = leon_cross_call,
<------>.resched    = leon_ipi_resched,
<------>.single     = leon_ipi_single,
<------>.mask_one   = leon_ipi_mask_one,
};
 
void __init leon_init_smp(void)
{
<------>/* Patch ipi15 trap table */
<------>t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m);
 
<------>sparc32_ipi_ops = &leon_ipi_ops;
}