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https://github.com/physwizz/a155-U-u1.git
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101 lines
2.2 KiB
C
101 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020 MediaTek Inc.
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*/
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <mt-plat/aee.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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//#include <mt-plat/sync_write.h>
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#include "scp_ipi_pin.h"
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#include "scp_helper.h"
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#include "scp_excep.h"
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#include "scp_dvfs.h"
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static inline void scp_wdt_clear(uint32_t coreid)
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{
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coreid == 0 ? writel(B_WDT_IRQ, R_CORE0_WDT_IRQ) :
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writel(B_WDT_IRQ, R_CORE1_WDT_IRQ);
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}
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static void wait_scp_ready_to_reboot(void)
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{
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int retry = 0;
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unsigned long c0, c1;
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/* clr after SCP side INT trigger,
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* or SCP may lost INT max wait = 200ms
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*/
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for (retry = SCP_AWAKE_TIMEOUT; retry > 0; retry--) {
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c0 = readl(SCP_GPR_CORE0_REBOOT);
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c1 = scpreg.core_nums == 2 ? readl(SCP_GPR_CORE1_REBOOT) :
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CORE_RDY_TO_REBOOT;
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if ((c0 == CORE_RDY_TO_REBOOT) && (c1 == CORE_RDY_TO_REBOOT))
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break;
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udelay(2);
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}
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if (retry == 0)
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pr_notice("[SCP] SCP don't stay in wfi c0:%lx c1:%lx\n", c0, c1);
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udelay(10);
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}
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/*
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* handler for wdt irq for scp
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* dump scp register
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*/
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static void scp_A_wdt_handler(struct tasklet_struct *t)
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{
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unsigned int reg0 = readl(R_CORE0_WDT_IRQ);
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unsigned int reg1 = scpreg.core_nums == 2 ?
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readl(R_CORE1_WDT_IRQ) : 0;
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#if SCP_RECOVERY_SUPPORT
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if (scp_set_reset_status() == RESET_STATUS_STOP) {
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pr_debug("[SCP] start to reset scp...\n");
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scp_dump_last_regs();
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scp_send_reset_wq(RESET_TYPE_WDT);
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} else
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pr_notice("%s: scp resetting\n", __func__);
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#endif
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wait_scp_ready_to_reboot();
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#if SCP_RESERVED_MEM && IS_ENABLED(CONFIG_OF_RESERVED_MEM)
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if (scpreg.secure_dump) {
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if (reg0)
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scp_do_wdt_clear(0);
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if (reg1)
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scp_do_wdt_clear(1);
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} else
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#endif
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{
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if (reg0)
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scp_wdt_clear(0);
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if (reg1)
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scp_wdt_clear(1);
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}
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enable_irq(t->data);
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}
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DECLARE_TASKLET(scp_A_irq0_tasklet, scp_A_wdt_handler);
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DECLARE_TASKLET(scp_A_irq1_tasklet, scp_A_wdt_handler);
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/*
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* dispatch scp irq
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* reset scp and generate exception if needed
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* @param irq: irq id
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* @param dev_id: should be NULL
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*/
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irqreturn_t scp_A_irq_handler(int irq, void *dev_id)
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{
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disable_irq_nosync(irq);
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if (likely(irq == scpreg.irq0))
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tasklet_schedule(&scp_A_irq0_tasklet);
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else
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tasklet_schedule(&scp_A_irq1_tasklet);
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return IRQ_HANDLED;
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}
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