882 lines
28 KiB
C
882 lines
28 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2010, 2011, 2012, Lemote, Inc.
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* Author: Chen Huacai, chenhc@lemote.com
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*/
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#include <irq.h>
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#include <linux/init.h>
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#include <linux/cpu.h>
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#include <linux/sched.h>
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#include <linux/sched/hotplug.h>
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#include <linux/sched/task_stack.h>
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#include <linux/smp.h>
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#include <linux/cpufreq.h>
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#include <linux/kexec.h>
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#include <asm/processor.h>
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#include <asm/time.h>
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#include <asm/tlbflush.h>
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#include <asm/cacheflush.h>
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#include <loongson.h>
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#include <loongson_regs.h>
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#include <workarounds.h>
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#include "smp.h"
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DEFINE_PER_CPU(int, cpu_state);
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#define LS_IPI_IRQ (MIPS_CPU_IRQ_BASE + 6)
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static void *ipi_set0_regs[16];
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static void *ipi_clear0_regs[16];
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static void *ipi_status0_regs[16];
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static void *ipi_en0_regs[16];
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static void *ipi_mailbox_buf[16];
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static uint32_t core0_c0count[NR_CPUS];
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/* read a 32bit value from ipi register */
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#define loongson3_ipi_read32(addr) readl(addr)
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/* read a 64bit value from ipi register */
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#define loongson3_ipi_read64(addr) readq(addr)
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/* write a 32bit value to ipi register */
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#define loongson3_ipi_write32(action, addr) \
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do { \
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writel(action, addr); \
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__wbflush(); \
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} while (0)
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/* write a 64bit value to ipi register */
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#define loongson3_ipi_write64(action, addr) \
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do { \
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writeq(action, addr); \
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__wbflush(); \
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} while (0)
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static u32 (*ipi_read_clear)(int cpu);
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static void (*ipi_write_action)(int cpu, u32 action);
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static void (*ipi_write_enable)(int cpu);
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static void (*ipi_clear_buf)(int cpu);
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static void (*ipi_write_buf)(int cpu, struct task_struct *idle);
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/* send mail via Mail_Send register for 3A4000+ CPU */
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static void csr_mail_send(uint64_t data, int cpu, int mailbox)
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{
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uint64_t val;
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/* send high 32 bits */
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val = CSR_MAIL_SEND_BLOCK;
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val |= (CSR_MAIL_SEND_BOX_HIGH(mailbox) << CSR_MAIL_SEND_BOX_SHIFT);
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val |= (cpu << CSR_MAIL_SEND_CPU_SHIFT);
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val |= (data & CSR_MAIL_SEND_H32_MASK);
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csr_writeq(val, LOONGSON_CSR_MAIL_SEND);
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/* send low 32 bits */
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val = CSR_MAIL_SEND_BLOCK;
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val |= (CSR_MAIL_SEND_BOX_LOW(mailbox) << CSR_MAIL_SEND_BOX_SHIFT);
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val |= (cpu << CSR_MAIL_SEND_CPU_SHIFT);
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val |= (data << CSR_MAIL_SEND_BUF_SHIFT);
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csr_writeq(val, LOONGSON_CSR_MAIL_SEND);
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};
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static u32 csr_ipi_read_clear(int cpu)
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{
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u32 action;
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/* Load the ipi register to figure out what we're supposed to do */
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action = csr_readl(LOONGSON_CSR_IPI_STATUS);
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/* Clear the ipi register to clear the interrupt */
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csr_writel(action, LOONGSON_CSR_IPI_CLEAR);
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return action;
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}
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static void csr_ipi_write_action(int cpu, u32 action)
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{
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unsigned int irq = 0;
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while ((irq = ffs(action))) {
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uint32_t val = CSR_IPI_SEND_BLOCK;
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val |= (irq - 1);
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val |= (cpu << CSR_IPI_SEND_CPU_SHIFT);
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csr_writel(val, LOONGSON_CSR_IPI_SEND);
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action &= ~BIT(irq - 1);
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}
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}
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static void csr_ipi_write_enable(int cpu)
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{
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csr_writel(0xffffffff, LOONGSON_CSR_IPI_EN);
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}
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static void csr_ipi_clear_buf(int cpu)
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{
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csr_writeq(0, LOONGSON_CSR_MAIL_BUF0);
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}
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static void csr_ipi_write_buf(int cpu, struct task_struct *idle)
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{
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unsigned long startargs[4];
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/* startargs[] are initial PC, SP and GP for secondary CPU */
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startargs[0] = (unsigned long)&smp_bootstrap;
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startargs[1] = (unsigned long)__KSTK_TOS(idle);
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startargs[2] = (unsigned long)task_thread_info(idle);
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startargs[3] = 0;
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pr_debug("CPU#%d, func_pc=%lx, sp=%lx, gp=%lx\n",
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cpu, startargs[0], startargs[1], startargs[2]);
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csr_mail_send(startargs[3], cpu_logical_map(cpu), 3);
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csr_mail_send(startargs[2], cpu_logical_map(cpu), 2);
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csr_mail_send(startargs[1], cpu_logical_map(cpu), 1);
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csr_mail_send(startargs[0], cpu_logical_map(cpu), 0);
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}
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static u32 legacy_ipi_read_clear(int cpu)
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{
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u32 action;
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/* Load the ipi register to figure out what we're supposed to do */
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action = loongson3_ipi_read32(ipi_status0_regs[cpu_logical_map(cpu)]);
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/* Clear the ipi register to clear the interrupt */
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loongson3_ipi_write32(action, ipi_clear0_regs[cpu_logical_map(cpu)]);
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return action;
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}
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static void legacy_ipi_write_action(int cpu, u32 action)
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{
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loongson3_ipi_write32((u32)action, ipi_set0_regs[cpu]);
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}
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static void legacy_ipi_write_enable(int cpu)
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{
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loongson3_ipi_write32(0xffffffff, ipi_en0_regs[cpu_logical_map(cpu)]);
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}
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static void legacy_ipi_clear_buf(int cpu)
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{
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loongson3_ipi_write64(0, ipi_mailbox_buf[cpu_logical_map(cpu)] + 0x0);
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}
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static void legacy_ipi_write_buf(int cpu, struct task_struct *idle)
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{
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unsigned long startargs[4];
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/* startargs[] are initial PC, SP and GP for secondary CPU */
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startargs[0] = (unsigned long)&smp_bootstrap;
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startargs[1] = (unsigned long)__KSTK_TOS(idle);
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startargs[2] = (unsigned long)task_thread_info(idle);
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startargs[3] = 0;
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pr_debug("CPU#%d, func_pc=%lx, sp=%lx, gp=%lx\n",
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cpu, startargs[0], startargs[1], startargs[2]);
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loongson3_ipi_write64(startargs[3],
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ipi_mailbox_buf[cpu_logical_map(cpu)] + 0x18);
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loongson3_ipi_write64(startargs[2],
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ipi_mailbox_buf[cpu_logical_map(cpu)] + 0x10);
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loongson3_ipi_write64(startargs[1],
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ipi_mailbox_buf[cpu_logical_map(cpu)] + 0x8);
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loongson3_ipi_write64(startargs[0],
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ipi_mailbox_buf[cpu_logical_map(cpu)] + 0x0);
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}
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static void csr_ipi_probe(void)
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{
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if (cpu_has_csr() && csr_readl(LOONGSON_CSR_FEATURES) & LOONGSON_CSRF_IPI) {
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ipi_read_clear = csr_ipi_read_clear;
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ipi_write_action = csr_ipi_write_action;
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ipi_write_enable = csr_ipi_write_enable;
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ipi_clear_buf = csr_ipi_clear_buf;
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ipi_write_buf = csr_ipi_write_buf;
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} else {
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ipi_read_clear = legacy_ipi_read_clear;
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ipi_write_action = legacy_ipi_write_action;
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ipi_write_enable = legacy_ipi_write_enable;
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ipi_clear_buf = legacy_ipi_clear_buf;
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ipi_write_buf = legacy_ipi_write_buf;
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}
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}
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static void ipi_set0_regs_init(void)
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{
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ipi_set0_regs[0] = (void *)
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(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + SET0);
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ipi_set0_regs[1] = (void *)
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(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + SET0);
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ipi_set0_regs[2] = (void *)
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(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + SET0);
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ipi_set0_regs[3] = (void *)
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(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + SET0);
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ipi_set0_regs[4] = (void *)
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(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + SET0);
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ipi_set0_regs[5] = (void *)
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(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + SET0);
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ipi_set0_regs[6] = (void *)
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(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + SET0);
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ipi_set0_regs[7] = (void *)
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(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + SET0);
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ipi_set0_regs[8] = (void *)
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(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + SET0);
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ipi_set0_regs[9] = (void *)
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(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + SET0);
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ipi_set0_regs[10] = (void *)
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(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + SET0);
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ipi_set0_regs[11] = (void *)
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(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + SET0);
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ipi_set0_regs[12] = (void *)
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(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + SET0);
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ipi_set0_regs[13] = (void *)
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(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + SET0);
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ipi_set0_regs[14] = (void *)
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(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + SET0);
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ipi_set0_regs[15] = (void *)
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(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + SET0);
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}
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static void ipi_clear0_regs_init(void)
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{
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ipi_clear0_regs[0] = (void *)
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(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + CLEAR0);
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ipi_clear0_regs[1] = (void *)
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(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + CLEAR0);
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ipi_clear0_regs[2] = (void *)
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(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + CLEAR0);
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ipi_clear0_regs[3] = (void *)
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(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + CLEAR0);
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ipi_clear0_regs[4] = (void *)
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(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + CLEAR0);
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ipi_clear0_regs[5] = (void *)
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(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + CLEAR0);
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ipi_clear0_regs[6] = (void *)
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(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + CLEAR0);
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ipi_clear0_regs[7] = (void *)
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(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + CLEAR0);
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ipi_clear0_regs[8] = (void *)
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(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + CLEAR0);
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ipi_clear0_regs[9] = (void *)
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(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + CLEAR0);
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ipi_clear0_regs[10] = (void *)
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(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + CLEAR0);
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ipi_clear0_regs[11] = (void *)
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(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + CLEAR0);
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ipi_clear0_regs[12] = (void *)
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(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + CLEAR0);
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ipi_clear0_regs[13] = (void *)
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(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + CLEAR0);
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ipi_clear0_regs[14] = (void *)
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(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + CLEAR0);
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ipi_clear0_regs[15] = (void *)
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(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + CLEAR0);
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}
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static void ipi_status0_regs_init(void)
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{
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ipi_status0_regs[0] = (void *)
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(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + STATUS0);
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ipi_status0_regs[1] = (void *)
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(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + STATUS0);
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ipi_status0_regs[2] = (void *)
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(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + STATUS0);
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ipi_status0_regs[3] = (void *)
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(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + STATUS0);
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ipi_status0_regs[4] = (void *)
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(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + STATUS0);
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ipi_status0_regs[5] = (void *)
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(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + STATUS0);
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ipi_status0_regs[6] = (void *)
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(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + STATUS0);
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ipi_status0_regs[7] = (void *)
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(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + STATUS0);
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ipi_status0_regs[8] = (void *)
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(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + STATUS0);
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ipi_status0_regs[9] = (void *)
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(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + STATUS0);
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ipi_status0_regs[10] = (void *)
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(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + STATUS0);
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ipi_status0_regs[11] = (void *)
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(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + STATUS0);
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ipi_status0_regs[12] = (void *)
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(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + STATUS0);
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ipi_status0_regs[13] = (void *)
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(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + STATUS0);
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ipi_status0_regs[14] = (void *)
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(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + STATUS0);
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ipi_status0_regs[15] = (void *)
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(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + STATUS0);
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|
}
|
||
|
|
|
||
|
|
static void ipi_en0_regs_init(void)
|
||
|
|
{
|
||
|
|
ipi_en0_regs[0] = (void *)
|
||
|
|
(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + EN0);
|
||
|
|
ipi_en0_regs[1] = (void *)
|
||
|
|
(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + EN0);
|
||
|
|
ipi_en0_regs[2] = (void *)
|
||
|
|
(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + EN0);
|
||
|
|
ipi_en0_regs[3] = (void *)
|
||
|
|
(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + EN0);
|
||
|
|
ipi_en0_regs[4] = (void *)
|
||
|
|
(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + EN0);
|
||
|
|
ipi_en0_regs[5] = (void *)
|
||
|
|
(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + EN0);
|
||
|
|
ipi_en0_regs[6] = (void *)
|
||
|
|
(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + EN0);
|
||
|
|
ipi_en0_regs[7] = (void *)
|
||
|
|
(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + EN0);
|
||
|
|
ipi_en0_regs[8] = (void *)
|
||
|
|
(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + EN0);
|
||
|
|
ipi_en0_regs[9] = (void *)
|
||
|
|
(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + EN0);
|
||
|
|
ipi_en0_regs[10] = (void *)
|
||
|
|
(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + EN0);
|
||
|
|
ipi_en0_regs[11] = (void *)
|
||
|
|
(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + EN0);
|
||
|
|
ipi_en0_regs[12] = (void *)
|
||
|
|
(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + EN0);
|
||
|
|
ipi_en0_regs[13] = (void *)
|
||
|
|
(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + EN0);
|
||
|
|
ipi_en0_regs[14] = (void *)
|
||
|
|
(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + EN0);
|
||
|
|
ipi_en0_regs[15] = (void *)
|
||
|
|
(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + EN0);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ipi_mailbox_buf_init(void)
|
||
|
|
{
|
||
|
|
ipi_mailbox_buf[0] = (void *)
|
||
|
|
(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + BUF);
|
||
|
|
ipi_mailbox_buf[1] = (void *)
|
||
|
|
(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + BUF);
|
||
|
|
ipi_mailbox_buf[2] = (void *)
|
||
|
|
(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + BUF);
|
||
|
|
ipi_mailbox_buf[3] = (void *)
|
||
|
|
(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + BUF);
|
||
|
|
ipi_mailbox_buf[4] = (void *)
|
||
|
|
(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + BUF);
|
||
|
|
ipi_mailbox_buf[5] = (void *)
|
||
|
|
(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + BUF);
|
||
|
|
ipi_mailbox_buf[6] = (void *)
|
||
|
|
(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + BUF);
|
||
|
|
ipi_mailbox_buf[7] = (void *)
|
||
|
|
(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + BUF);
|
||
|
|
ipi_mailbox_buf[8] = (void *)
|
||
|
|
(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + BUF);
|
||
|
|
ipi_mailbox_buf[9] = (void *)
|
||
|
|
(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + BUF);
|
||
|
|
ipi_mailbox_buf[10] = (void *)
|
||
|
|
(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + BUF);
|
||
|
|
ipi_mailbox_buf[11] = (void *)
|
||
|
|
(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + BUF);
|
||
|
|
ipi_mailbox_buf[12] = (void *)
|
||
|
|
(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + BUF);
|
||
|
|
ipi_mailbox_buf[13] = (void *)
|
||
|
|
(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + BUF);
|
||
|
|
ipi_mailbox_buf[14] = (void *)
|
||
|
|
(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + BUF);
|
||
|
|
ipi_mailbox_buf[15] = (void *)
|
||
|
|
(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + BUF);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Simple enough, just poke the appropriate ipi register
|
||
|
|
*/
|
||
|
|
static void loongson3_send_ipi_single(int cpu, unsigned int action)
|
||
|
|
{
|
||
|
|
ipi_write_action(cpu_logical_map(cpu), (u32)action);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
loongson3_send_ipi_mask(const struct cpumask *mask, unsigned int action)
|
||
|
|
{
|
||
|
|
unsigned int i;
|
||
|
|
|
||
|
|
for_each_cpu(i, mask)
|
||
|
|
ipi_write_action(cpu_logical_map(i), (u32)action);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static irqreturn_t loongson3_ipi_interrupt(int irq, void *dev_id)
|
||
|
|
{
|
||
|
|
int i, cpu = smp_processor_id();
|
||
|
|
unsigned int action, c0count;
|
||
|
|
|
||
|
|
action = ipi_read_clear(cpu);
|
||
|
|
|
||
|
|
if (action & SMP_RESCHEDULE_YOURSELF)
|
||
|
|
scheduler_ipi();
|
||
|
|
|
||
|
|
if (action & SMP_CALL_FUNCTION) {
|
||
|
|
irq_enter();
|
||
|
|
generic_smp_call_function_interrupt();
|
||
|
|
irq_exit();
|
||
|
|
}
|
||
|
|
|
||
|
|
if (action & SMP_ASK_C0COUNT) {
|
||
|
|
BUG_ON(cpu != 0);
|
||
|
|
c0count = read_c0_count();
|
||
|
|
c0count = c0count ? c0count : 1;
|
||
|
|
for (i = 1; i < nr_cpu_ids; i++)
|
||
|
|
core0_c0count[i] = c0count;
|
||
|
|
__wbflush(); /* Let others see the result ASAP */
|
||
|
|
}
|
||
|
|
|
||
|
|
return IRQ_HANDLED;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define MAX_LOOPS 800
|
||
|
|
/*
|
||
|
|
* SMP init and finish on secondary CPUs
|
||
|
|
*/
|
||
|
|
static void loongson3_init_secondary(void)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
uint32_t initcount;
|
||
|
|
unsigned int cpu = smp_processor_id();
|
||
|
|
unsigned int imask = STATUSF_IP7 | STATUSF_IP6 |
|
||
|
|
STATUSF_IP3 | STATUSF_IP2;
|
||
|
|
|
||
|
|
/* Set interrupt mask, but don't enable */
|
||
|
|
change_c0_status(ST0_IM, imask);
|
||
|
|
ipi_write_enable(cpu);
|
||
|
|
|
||
|
|
per_cpu(cpu_state, cpu) = CPU_ONLINE;
|
||
|
|
cpu_set_core(&cpu_data[cpu],
|
||
|
|
cpu_logical_map(cpu) % loongson_sysconf.cores_per_package);
|
||
|
|
cpu_data[cpu].package =
|
||
|
|
cpu_logical_map(cpu) / loongson_sysconf.cores_per_package;
|
||
|
|
|
||
|
|
i = 0;
|
||
|
|
core0_c0count[cpu] = 0;
|
||
|
|
loongson3_send_ipi_single(0, SMP_ASK_C0COUNT);
|
||
|
|
while (!core0_c0count[cpu]) {
|
||
|
|
i++;
|
||
|
|
cpu_relax();
|
||
|
|
}
|
||
|
|
|
||
|
|
if (i > MAX_LOOPS)
|
||
|
|
i = MAX_LOOPS;
|
||
|
|
if (cpu_data[cpu].package)
|
||
|
|
initcount = core0_c0count[cpu] + i;
|
||
|
|
else /* Local access is faster for loops */
|
||
|
|
initcount = core0_c0count[cpu] + i/2;
|
||
|
|
|
||
|
|
write_c0_count(initcount);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void loongson3_smp_finish(void)
|
||
|
|
{
|
||
|
|
int cpu = smp_processor_id();
|
||
|
|
|
||
|
|
write_c0_compare(read_c0_count() + mips_hpt_frequency/HZ);
|
||
|
|
local_irq_enable();
|
||
|
|
ipi_clear_buf(cpu);
|
||
|
|
|
||
|
|
pr_info("CPU#%d finished, CP0_ST=%x\n",
|
||
|
|
smp_processor_id(), read_c0_status());
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __init loongson3_smp_setup(void)
|
||
|
|
{
|
||
|
|
int i = 0, num = 0; /* i: physical id, num: logical id */
|
||
|
|
|
||
|
|
init_cpu_possible(cpu_none_mask);
|
||
|
|
|
||
|
|
/* For unified kernel, NR_CPUS is the maximum possible value,
|
||
|
|
* loongson_sysconf.nr_cpus is the really present value
|
||
|
|
*/
|
||
|
|
while (i < loongson_sysconf.nr_cpus) {
|
||
|
|
if (loongson_sysconf.reserved_cpus_mask & (1<<i)) {
|
||
|
|
/* Reserved physical CPU cores */
|
||
|
|
__cpu_number_map[i] = -1;
|
||
|
|
} else {
|
||
|
|
__cpu_number_map[i] = num;
|
||
|
|
__cpu_logical_map[num] = i;
|
||
|
|
set_cpu_possible(num, true);
|
||
|
|
/* Loongson processors are always grouped by 4 */
|
||
|
|
cpu_set_cluster(&cpu_data[num], i / 4);
|
||
|
|
num++;
|
||
|
|
}
|
||
|
|
i++;
|
||
|
|
}
|
||
|
|
pr_info("Detected %i available CPU(s)\n", num);
|
||
|
|
|
||
|
|
while (num < loongson_sysconf.nr_cpus) {
|
||
|
|
__cpu_logical_map[num] = -1;
|
||
|
|
num++;
|
||
|
|
}
|
||
|
|
|
||
|
|
csr_ipi_probe();
|
||
|
|
ipi_set0_regs_init();
|
||
|
|
ipi_clear0_regs_init();
|
||
|
|
ipi_status0_regs_init();
|
||
|
|
ipi_en0_regs_init();
|
||
|
|
ipi_mailbox_buf_init();
|
||
|
|
ipi_write_enable(0);
|
||
|
|
|
||
|
|
cpu_set_core(&cpu_data[0],
|
||
|
|
cpu_logical_map(0) % loongson_sysconf.cores_per_package);
|
||
|
|
cpu_data[0].package = cpu_logical_map(0) / loongson_sysconf.cores_per_package;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __init loongson3_prepare_cpus(unsigned int max_cpus)
|
||
|
|
{
|
||
|
|
if (request_irq(LS_IPI_IRQ, loongson3_ipi_interrupt,
|
||
|
|
IRQF_PERCPU | IRQF_NO_SUSPEND, "SMP_IPI", NULL))
|
||
|
|
pr_err("Failed to request IPI IRQ\n");
|
||
|
|
init_cpu_present(cpu_possible_mask);
|
||
|
|
per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Setup the PC, SP, and GP of a secondary processor and start it runing!
|
||
|
|
*/
|
||
|
|
static int loongson3_boot_secondary(int cpu, struct task_struct *idle)
|
||
|
|
{
|
||
|
|
pr_info("Booting CPU#%d...\n", cpu);
|
||
|
|
|
||
|
|
ipi_write_buf(cpu, idle);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
||
|
|
|
||
|
|
static int loongson3_cpu_disable(void)
|
||
|
|
{
|
||
|
|
unsigned long flags;
|
||
|
|
unsigned int cpu = smp_processor_id();
|
||
|
|
|
||
|
|
set_cpu_online(cpu, false);
|
||
|
|
calculate_cpu_foreign_map();
|
||
|
|
local_irq_save(flags);
|
||
|
|
clear_c0_status(ST0_IM);
|
||
|
|
local_irq_restore(flags);
|
||
|
|
local_flush_tlb_all();
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static void loongson3_cpu_die(unsigned int cpu)
|
||
|
|
{
|
||
|
|
while (per_cpu(cpu_state, cpu) != CPU_DEAD)
|
||
|
|
cpu_relax();
|
||
|
|
|
||
|
|
mb();
|
||
|
|
}
|
||
|
|
|
||
|
|
/* To shutdown a core in Loongson 3, the target core should go to CKSEG1 and
|
||
|
|
* flush all L1 entries at first. Then, another core (usually Core 0) can
|
||
|
|
* safely disable the clock of the target core. loongson3_play_dead() is
|
||
|
|
* called via CKSEG1 (uncached and unmmaped)
|
||
|
|
*/
|
||
|
|
static void loongson3_type1_play_dead(int *state_addr)
|
||
|
|
{
|
||
|
|
register int val;
|
||
|
|
register long cpuid, core, node, count;
|
||
|
|
register void *addr, *base, *initfunc;
|
||
|
|
|
||
|
|
__asm__ __volatile__(
|
||
|
|
" .set push \n"
|
||
|
|
" .set noreorder \n"
|
||
|
|
" li %[addr], 0x80000000 \n" /* KSEG0 */
|
||
|
|
"1: cache 0, 0(%[addr]) \n" /* flush L1 ICache */
|
||
|
|
" cache 0, 1(%[addr]) \n"
|
||
|
|
" cache 0, 2(%[addr]) \n"
|
||
|
|
" cache 0, 3(%[addr]) \n"
|
||
|
|
" cache 1, 0(%[addr]) \n" /* flush L1 DCache */
|
||
|
|
" cache 1, 1(%[addr]) \n"
|
||
|
|
" cache 1, 2(%[addr]) \n"
|
||
|
|
" cache 1, 3(%[addr]) \n"
|
||
|
|
" addiu %[sets], %[sets], -1 \n"
|
||
|
|
" bnez %[sets], 1b \n"
|
||
|
|
" addiu %[addr], %[addr], 0x20 \n"
|
||
|
|
" li %[val], 0x7 \n" /* *state_addr = CPU_DEAD; */
|
||
|
|
" sw %[val], (%[state_addr]) \n"
|
||
|
|
" sync \n"
|
||
|
|
" cache 21, (%[state_addr]) \n" /* flush entry of *state_addr */
|
||
|
|
" .set pop \n"
|
||
|
|
: [addr] "=&r" (addr), [val] "=&r" (val)
|
||
|
|
: [state_addr] "r" (state_addr),
|
||
|
|
[sets] "r" (cpu_data[smp_processor_id()].dcache.sets));
|
||
|
|
|
||
|
|
__asm__ __volatile__(
|
||
|
|
" .set push \n"
|
||
|
|
" .set noreorder \n"
|
||
|
|
" .set mips64 \n"
|
||
|
|
" mfc0 %[cpuid], $15, 1 \n"
|
||
|
|
" andi %[cpuid], 0x3ff \n"
|
||
|
|
" dli %[base], 0x900000003ff01000 \n"
|
||
|
|
" andi %[core], %[cpuid], 0x3 \n"
|
||
|
|
" sll %[core], 8 \n" /* get core id */
|
||
|
|
" or %[base], %[base], %[core] \n"
|
||
|
|
" andi %[node], %[cpuid], 0xc \n"
|
||
|
|
" dsll %[node], 42 \n" /* get node id */
|
||
|
|
" or %[base], %[base], %[node] \n"
|
||
|
|
"1: li %[count], 0x100 \n" /* wait for init loop */
|
||
|
|
"2: bnez %[count], 2b \n" /* limit mailbox access */
|
||
|
|
" addiu %[count], -1 \n"
|
||
|
|
" ld %[initfunc], 0x20(%[base]) \n" /* get PC via mailbox */
|
||
|
|
" beqz %[initfunc], 1b \n"
|
||
|
|
" nop \n"
|
||
|
|
" ld $sp, 0x28(%[base]) \n" /* get SP via mailbox */
|
||
|
|
" ld $gp, 0x30(%[base]) \n" /* get GP via mailbox */
|
||
|
|
" ld $a1, 0x38(%[base]) \n"
|
||
|
|
" jr %[initfunc] \n" /* jump to initial PC */
|
||
|
|
" nop \n"
|
||
|
|
" .set pop \n"
|
||
|
|
: [core] "=&r" (core), [node] "=&r" (node),
|
||
|
|
[base] "=&r" (base), [cpuid] "=&r" (cpuid),
|
||
|
|
[count] "=&r" (count), [initfunc] "=&r" (initfunc)
|
||
|
|
: /* No Input */
|
||
|
|
: "a1");
|
||
|
|
}
|
||
|
|
|
||
|
|
static void loongson3_type2_play_dead(int *state_addr)
|
||
|
|
{
|
||
|
|
register int val;
|
||
|
|
register long cpuid, core, node, count;
|
||
|
|
register void *addr, *base, *initfunc;
|
||
|
|
|
||
|
|
__asm__ __volatile__(
|
||
|
|
" .set push \n"
|
||
|
|
" .set noreorder \n"
|
||
|
|
" li %[addr], 0x80000000 \n" /* KSEG0 */
|
||
|
|
"1: cache 0, 0(%[addr]) \n" /* flush L1 ICache */
|
||
|
|
" cache 0, 1(%[addr]) \n"
|
||
|
|
" cache 0, 2(%[addr]) \n"
|
||
|
|
" cache 0, 3(%[addr]) \n"
|
||
|
|
" cache 1, 0(%[addr]) \n" /* flush L1 DCache */
|
||
|
|
" cache 1, 1(%[addr]) \n"
|
||
|
|
" cache 1, 2(%[addr]) \n"
|
||
|
|
" cache 1, 3(%[addr]) \n"
|
||
|
|
" addiu %[sets], %[sets], -1 \n"
|
||
|
|
" bnez %[sets], 1b \n"
|
||
|
|
" addiu %[addr], %[addr], 0x20 \n"
|
||
|
|
" li %[val], 0x7 \n" /* *state_addr = CPU_DEAD; */
|
||
|
|
" sw %[val], (%[state_addr]) \n"
|
||
|
|
" sync \n"
|
||
|
|
" cache 21, (%[state_addr]) \n" /* flush entry of *state_addr */
|
||
|
|
" .set pop \n"
|
||
|
|
: [addr] "=&r" (addr), [val] "=&r" (val)
|
||
|
|
: [state_addr] "r" (state_addr),
|
||
|
|
[sets] "r" (cpu_data[smp_processor_id()].dcache.sets));
|
||
|
|
|
||
|
|
__asm__ __volatile__(
|
||
|
|
" .set push \n"
|
||
|
|
" .set noreorder \n"
|
||
|
|
" .set mips64 \n"
|
||
|
|
" mfc0 %[cpuid], $15, 1 \n"
|
||
|
|
" andi %[cpuid], 0x3ff \n"
|
||
|
|
" dli %[base], 0x900000003ff01000 \n"
|
||
|
|
" andi %[core], %[cpuid], 0x3 \n"
|
||
|
|
" sll %[core], 8 \n" /* get core id */
|
||
|
|
" or %[base], %[base], %[core] \n"
|
||
|
|
" andi %[node], %[cpuid], 0xc \n"
|
||
|
|
" dsll %[node], 42 \n" /* get node id */
|
||
|
|
" or %[base], %[base], %[node] \n"
|
||
|
|
" dsrl %[node], 30 \n" /* 15:14 */
|
||
|
|
" or %[base], %[base], %[node] \n"
|
||
|
|
"1: li %[count], 0x100 \n" /* wait for init loop */
|
||
|
|
"2: bnez %[count], 2b \n" /* limit mailbox access */
|
||
|
|
" addiu %[count], -1 \n"
|
||
|
|
" ld %[initfunc], 0x20(%[base]) \n" /* get PC via mailbox */
|
||
|
|
" beqz %[initfunc], 1b \n"
|
||
|
|
" nop \n"
|
||
|
|
" ld $sp, 0x28(%[base]) \n" /* get SP via mailbox */
|
||
|
|
" ld $gp, 0x30(%[base]) \n" /* get GP via mailbox */
|
||
|
|
" ld $a1, 0x38(%[base]) \n"
|
||
|
|
" jr %[initfunc] \n" /* jump to initial PC */
|
||
|
|
" nop \n"
|
||
|
|
" .set pop \n"
|
||
|
|
: [core] "=&r" (core), [node] "=&r" (node),
|
||
|
|
[base] "=&r" (base), [cpuid] "=&r" (cpuid),
|
||
|
|
[count] "=&r" (count), [initfunc] "=&r" (initfunc)
|
||
|
|
: /* No Input */
|
||
|
|
: "a1");
|
||
|
|
}
|
||
|
|
|
||
|
|
static void loongson3_type3_play_dead(int *state_addr)
|
||
|
|
{
|
||
|
|
register int val;
|
||
|
|
register long cpuid, core, node, count;
|
||
|
|
register void *addr, *base, *initfunc;
|
||
|
|
|
||
|
|
__asm__ __volatile__(
|
||
|
|
" .set push \n"
|
||
|
|
" .set noreorder \n"
|
||
|
|
" li %[addr], 0x80000000 \n" /* KSEG0 */
|
||
|
|
"1: cache 0, 0(%[addr]) \n" /* flush L1 ICache */
|
||
|
|
" cache 0, 1(%[addr]) \n"
|
||
|
|
" cache 0, 2(%[addr]) \n"
|
||
|
|
" cache 0, 3(%[addr]) \n"
|
||
|
|
" cache 1, 0(%[addr]) \n" /* flush L1 DCache */
|
||
|
|
" cache 1, 1(%[addr]) \n"
|
||
|
|
" cache 1, 2(%[addr]) \n"
|
||
|
|
" cache 1, 3(%[addr]) \n"
|
||
|
|
" addiu %[sets], %[sets], -1 \n"
|
||
|
|
" bnez %[sets], 1b \n"
|
||
|
|
" addiu %[addr], %[addr], 0x40 \n"
|
||
|
|
" li %[addr], 0x80000000 \n" /* KSEG0 */
|
||
|
|
"2: cache 2, 0(%[addr]) \n" /* flush L1 VCache */
|
||
|
|
" cache 2, 1(%[addr]) \n"
|
||
|
|
" cache 2, 2(%[addr]) \n"
|
||
|
|
" cache 2, 3(%[addr]) \n"
|
||
|
|
" cache 2, 4(%[addr]) \n"
|
||
|
|
" cache 2, 5(%[addr]) \n"
|
||
|
|
" cache 2, 6(%[addr]) \n"
|
||
|
|
" cache 2, 7(%[addr]) \n"
|
||
|
|
" cache 2, 8(%[addr]) \n"
|
||
|
|
" cache 2, 9(%[addr]) \n"
|
||
|
|
" cache 2, 10(%[addr]) \n"
|
||
|
|
" cache 2, 11(%[addr]) \n"
|
||
|
|
" cache 2, 12(%[addr]) \n"
|
||
|
|
" cache 2, 13(%[addr]) \n"
|
||
|
|
" cache 2, 14(%[addr]) \n"
|
||
|
|
" cache 2, 15(%[addr]) \n"
|
||
|
|
" addiu %[vsets], %[vsets], -1 \n"
|
||
|
|
" bnez %[vsets], 2b \n"
|
||
|
|
" addiu %[addr], %[addr], 0x40 \n"
|
||
|
|
" li %[val], 0x7 \n" /* *state_addr = CPU_DEAD; */
|
||
|
|
" sw %[val], (%[state_addr]) \n"
|
||
|
|
" sync \n"
|
||
|
|
" cache 21, (%[state_addr]) \n" /* flush entry of *state_addr */
|
||
|
|
" .set pop \n"
|
||
|
|
: [addr] "=&r" (addr), [val] "=&r" (val)
|
||
|
|
: [state_addr] "r" (state_addr),
|
||
|
|
[sets] "r" (cpu_data[smp_processor_id()].dcache.sets),
|
||
|
|
[vsets] "r" (cpu_data[smp_processor_id()].vcache.sets));
|
||
|
|
|
||
|
|
__asm__ __volatile__(
|
||
|
|
" .set push \n"
|
||
|
|
" .set noreorder \n"
|
||
|
|
" .set mips64 \n"
|
||
|
|
" mfc0 %[cpuid], $15, 1 \n"
|
||
|
|
" andi %[cpuid], 0x3ff \n"
|
||
|
|
" dli %[base], 0x900000003ff01000 \n"
|
||
|
|
" andi %[core], %[cpuid], 0x3 \n"
|
||
|
|
" sll %[core], 8 \n" /* get core id */
|
||
|
|
" or %[base], %[base], %[core] \n"
|
||
|
|
" andi %[node], %[cpuid], 0xc \n"
|
||
|
|
" dsll %[node], 42 \n" /* get node id */
|
||
|
|
" or %[base], %[base], %[node] \n"
|
||
|
|
"1: li %[count], 0x100 \n" /* wait for init loop */
|
||
|
|
"2: bnez %[count], 2b \n" /* limit mailbox access */
|
||
|
|
" addiu %[count], -1 \n"
|
||
|
|
" lw %[initfunc], 0x20(%[base]) \n" /* check lower 32-bit as jump indicator */
|
||
|
|
" beqz %[initfunc], 1b \n"
|
||
|
|
" nop \n"
|
||
|
|
" ld %[initfunc], 0x20(%[base]) \n" /* get PC (whole 64-bit) via mailbox */
|
||
|
|
" ld $sp, 0x28(%[base]) \n" /* get SP via mailbox */
|
||
|
|
" ld $gp, 0x30(%[base]) \n" /* get GP via mailbox */
|
||
|
|
" ld $a1, 0x38(%[base]) \n"
|
||
|
|
" jr %[initfunc] \n" /* jump to initial PC */
|
||
|
|
" nop \n"
|
||
|
|
" .set pop \n"
|
||
|
|
: [core] "=&r" (core), [node] "=&r" (node),
|
||
|
|
[base] "=&r" (base), [cpuid] "=&r" (cpuid),
|
||
|
|
[count] "=&r" (count), [initfunc] "=&r" (initfunc)
|
||
|
|
: /* No Input */
|
||
|
|
: "a1");
|
||
|
|
}
|
||
|
|
|
||
|
|
void play_dead(void)
|
||
|
|
{
|
||
|
|
int prid_imp, prid_rev, *state_addr;
|
||
|
|
unsigned int cpu = smp_processor_id();
|
||
|
|
void (*play_dead_at_ckseg1)(int *);
|
||
|
|
|
||
|
|
idle_task_exit();
|
||
|
|
|
||
|
|
prid_imp = read_c0_prid() & PRID_IMP_MASK;
|
||
|
|
prid_rev = read_c0_prid() & PRID_REV_MASK;
|
||
|
|
|
||
|
|
if (prid_imp == PRID_IMP_LOONGSON_64G) {
|
||
|
|
play_dead_at_ckseg1 =
|
||
|
|
(void *)CKSEG1ADDR((unsigned long)loongson3_type3_play_dead);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
switch (prid_rev) {
|
||
|
|
case PRID_REV_LOONGSON3A_R1:
|
||
|
|
default:
|
||
|
|
play_dead_at_ckseg1 =
|
||
|
|
(void *)CKSEG1ADDR((unsigned long)loongson3_type1_play_dead);
|
||
|
|
break;
|
||
|
|
case PRID_REV_LOONGSON3B_R1:
|
||
|
|
case PRID_REV_LOONGSON3B_R2:
|
||
|
|
play_dead_at_ckseg1 =
|
||
|
|
(void *)CKSEG1ADDR((unsigned long)loongson3_type2_play_dead);
|
||
|
|
break;
|
||
|
|
case PRID_REV_LOONGSON3A_R2_0:
|
||
|
|
case PRID_REV_LOONGSON3A_R2_1:
|
||
|
|
case PRID_REV_LOONGSON3A_R3_0:
|
||
|
|
case PRID_REV_LOONGSON3A_R3_1:
|
||
|
|
play_dead_at_ckseg1 =
|
||
|
|
(void *)CKSEG1ADDR((unsigned long)loongson3_type3_play_dead);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
out:
|
||
|
|
state_addr = &per_cpu(cpu_state, cpu);
|
||
|
|
mb();
|
||
|
|
play_dead_at_ckseg1(state_addr);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int loongson3_disable_clock(unsigned int cpu)
|
||
|
|
{
|
||
|
|
uint64_t core_id = cpu_core(&cpu_data[cpu]);
|
||
|
|
uint64_t package_id = cpu_data[cpu].package;
|
||
|
|
|
||
|
|
if ((read_c0_prid() & PRID_REV_MASK) == PRID_REV_LOONGSON3A_R1) {
|
||
|
|
LOONGSON_CHIPCFG(package_id) &= ~(1 << (12 + core_id));
|
||
|
|
} else {
|
||
|
|
if (!(loongson_sysconf.workarounds & WORKAROUND_CPUHOTPLUG))
|
||
|
|
LOONGSON_FREQCTRL(package_id) &= ~(1 << (core_id * 4 + 3));
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int loongson3_enable_clock(unsigned int cpu)
|
||
|
|
{
|
||
|
|
uint64_t core_id = cpu_core(&cpu_data[cpu]);
|
||
|
|
uint64_t package_id = cpu_data[cpu].package;
|
||
|
|
|
||
|
|
if ((read_c0_prid() & PRID_REV_MASK) == PRID_REV_LOONGSON3A_R1) {
|
||
|
|
LOONGSON_CHIPCFG(package_id) |= 1 << (12 + core_id);
|
||
|
|
} else {
|
||
|
|
if (!(loongson_sysconf.workarounds & WORKAROUND_CPUHOTPLUG))
|
||
|
|
LOONGSON_FREQCTRL(package_id) |= 1 << (core_id * 4 + 3);
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int register_loongson3_notifier(void)
|
||
|
|
{
|
||
|
|
return cpuhp_setup_state_nocalls(CPUHP_MIPS_SOC_PREPARE,
|
||
|
|
"mips/loongson:prepare",
|
||
|
|
loongson3_enable_clock,
|
||
|
|
loongson3_disable_clock);
|
||
|
|
}
|
||
|
|
early_initcall(register_loongson3_notifier);
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
const struct plat_smp_ops loongson3_smp_ops = {
|
||
|
|
.send_ipi_single = loongson3_send_ipi_single,
|
||
|
|
.send_ipi_mask = loongson3_send_ipi_mask,
|
||
|
|
.init_secondary = loongson3_init_secondary,
|
||
|
|
.smp_finish = loongson3_smp_finish,
|
||
|
|
.boot_secondary = loongson3_boot_secondary,
|
||
|
|
.smp_setup = loongson3_smp_setup,
|
||
|
|
.prepare_cpus = loongson3_prepare_cpus,
|
||
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
||
|
|
.cpu_disable = loongson3_cpu_disable,
|
||
|
|
.cpu_die = loongson3_cpu_die,
|
||
|
|
#endif
|
||
|
|
#ifdef CONFIG_KEXEC
|
||
|
|
.kexec_nonboot_cpu = kexec_nonboot_cpu_jump,
|
||
|
|
#endif
|
||
|
|
};
|