mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
145 lines
3.5 KiB
145 lines
3.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* SH-X3 SMP |
|
* |
|
* Copyright (C) 2007 - 2010 Paul Mundt |
|
* Copyright (C) 2007 Magnus Damm |
|
*/ |
|
#include <linux/init.h> |
|
#include <linux/kernel.h> |
|
#include <linux/cpumask.h> |
|
#include <linux/smp.h> |
|
#include <linux/interrupt.h> |
|
#include <linux/io.h> |
|
#include <linux/sched.h> |
|
#include <linux/delay.h> |
|
#include <linux/cpu.h> |
|
#include <asm/sections.h> |
|
|
|
#define STBCR_REG(phys_id) (0xfe400004 | (phys_id << 12)) |
|
#define RESET_REG(phys_id) (0xfe400008 | (phys_id << 12)) |
|
|
|
#define STBCR_MSTP 0x00000001 |
|
#define STBCR_RESET 0x00000002 |
|
#define STBCR_SLEEP 0x00000004 |
|
#define STBCR_LTSLP 0x80000000 |
|
|
|
static irqreturn_t ipi_interrupt_handler(int irq, void *arg) |
|
{ |
|
unsigned int message = (unsigned int)(long)arg; |
|
unsigned int cpu = hard_smp_processor_id(); |
|
unsigned int offs = 4 * cpu; |
|
unsigned int x; |
|
|
|
x = __raw_readl(0xfe410070 + offs); /* C0INITICI..CnINTICI */ |
|
x &= (1 << (message << 2)); |
|
__raw_writel(x, 0xfe410080 + offs); /* C0INTICICLR..CnINTICICLR */ |
|
|
|
smp_message_recv(message); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
static void shx3_smp_setup(void) |
|
{ |
|
unsigned int cpu = 0; |
|
int i, num; |
|
|
|
init_cpu_possible(cpumask_of(cpu)); |
|
|
|
/* Enable light sleep for the boot CPU */ |
|
__raw_writel(__raw_readl(STBCR_REG(cpu)) | STBCR_LTSLP, STBCR_REG(cpu)); |
|
|
|
__cpu_number_map[0] = 0; |
|
__cpu_logical_map[0] = 0; |
|
|
|
/* |
|
* Do this stupidly for now.. we don't have an easy way to probe |
|
* for the total number of cores. |
|
*/ |
|
for (i = 1, num = 0; i < NR_CPUS; i++) { |
|
set_cpu_possible(i, true); |
|
__cpu_number_map[i] = ++num; |
|
__cpu_logical_map[num] = i; |
|
} |
|
|
|
printk(KERN_INFO "Detected %i available secondary CPU(s)\n", num); |
|
} |
|
|
|
static void shx3_prepare_cpus(unsigned int max_cpus) |
|
{ |
|
int i; |
|
|
|
BUILD_BUG_ON(SMP_MSG_NR >= 8); |
|
|
|
for (i = 0; i < SMP_MSG_NR; i++) |
|
request_irq(104 + i, ipi_interrupt_handler, |
|
IRQF_PERCPU, "IPI", (void *)(long)i); |
|
|
|
for (i = 0; i < max_cpus; i++) |
|
set_cpu_present(i, true); |
|
} |
|
|
|
static void shx3_start_cpu(unsigned int cpu, unsigned long entry_point) |
|
{ |
|
if (__in_29bit_mode()) |
|
__raw_writel(entry_point, RESET_REG(cpu)); |
|
else |
|
__raw_writel(virt_to_phys(entry_point), RESET_REG(cpu)); |
|
|
|
if (!(__raw_readl(STBCR_REG(cpu)) & STBCR_MSTP)) |
|
__raw_writel(STBCR_MSTP, STBCR_REG(cpu)); |
|
|
|
while (!(__raw_readl(STBCR_REG(cpu)) & STBCR_MSTP)) |
|
cpu_relax(); |
|
|
|
/* Start up secondary processor by sending a reset */ |
|
__raw_writel(STBCR_RESET | STBCR_LTSLP, STBCR_REG(cpu)); |
|
} |
|
|
|
static unsigned int shx3_smp_processor_id(void) |
|
{ |
|
return __raw_readl(0xff000048); /* CPIDR */ |
|
} |
|
|
|
static void shx3_send_ipi(unsigned int cpu, unsigned int message) |
|
{ |
|
unsigned long addr = 0xfe410070 + (cpu * 4); |
|
|
|
BUG_ON(cpu >= 4); |
|
|
|
__raw_writel(1 << (message << 2), addr); /* C0INTICI..CnINTICI */ |
|
} |
|
|
|
static void shx3_update_boot_vector(unsigned int cpu) |
|
{ |
|
__raw_writel(STBCR_MSTP, STBCR_REG(cpu)); |
|
while (!(__raw_readl(STBCR_REG(cpu)) & STBCR_MSTP)) |
|
cpu_relax(); |
|
__raw_writel(STBCR_RESET, STBCR_REG(cpu)); |
|
} |
|
|
|
static int shx3_cpu_prepare(unsigned int cpu) |
|
{ |
|
shx3_update_boot_vector(cpu); |
|
return 0; |
|
} |
|
|
|
static int register_shx3_cpu_notifier(void) |
|
{ |
|
cpuhp_setup_state_nocalls(CPUHP_SH_SH3X_PREPARE, "sh/shx3:prepare", |
|
shx3_cpu_prepare, NULL); |
|
return 0; |
|
} |
|
late_initcall(register_shx3_cpu_notifier); |
|
|
|
struct plat_smp_ops shx3_smp_ops = { |
|
.smp_setup = shx3_smp_setup, |
|
.prepare_cpus = shx3_prepare_cpus, |
|
.start_cpu = shx3_start_cpu, |
|
.smp_processor_id = shx3_smp_processor_id, |
|
.send_ipi = shx3_send_ipi, |
|
.cpu_die = native_cpu_die, |
|
.cpu_disable = native_cpu_disable, |
|
.play_dead = native_play_dead, |
|
};
|
|
|