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// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
* Copyright (c) 2018 Microsemi Corporation
*/
#include <asm/sections.h>
#include <asm/io.h>
#include <asm/reboot.h>
void _machine_restart(void)
{
#if defined(CONFIG_SOC_JR2) || defined(CONFIG_SOC_SERVALT)
register u32 reg = readl(BASE_CFG + ICPU_GENERAL_CTRL);
/* Set owner */
reg &= ~ICPU_GENERAL_CTRL_IF_SI_OWNER_M;
reg |= ICPU_GENERAL_CTRL_IF_SI_OWNER(1);
/* Set boot mode */
reg |= ICPU_GENERAL_CTRL_BOOT_MODE_ENA;
writel(reg, BASE_CFG + ICPU_GENERAL_CTRL);
/* Read back in order to make BOOT mode setting active */
reg = readl(BASE_CFG + ICPU_GENERAL_CTRL);
/* Reset CPU only - still executing _here_. but from cache */
writel(readl(BASE_CFG + ICPU_RESET) |
ICPU_RESET_CORE_RST_CPU_ONLY |
ICPU_RESET_CORE_RST_FORCE,
BASE_CFG + ICPU_RESET);
#elif defined(CONFIG_SOC_SERVAL)
register unsigned long i;
/* Prevent VCore-III from being reset with a global reset */
writel(ICPU_RESET_CORE_RST_PROTECT, BASE_CFG + ICPU_RESET);
/* Do global reset */
writel(PERF_SOFT_RST_SOFT_CHIP_RST, BASE_DEVCPU_GCB + PERF_SOFT_RST);
for (i = 0; i < 2000; i++)
;
/* Power down DDR for clean DDR re-training */
writel(readl(BASE_CFG + ICPU_MEMCTRL_CTRL) |
ICPU_MEMCTRL_CTRL_PWR_DOWN,
BASE_CFG + ICPU_MEMCTRL_CTRL);
while (!(readl(BASE_CFG + ICPU_MEMCTRL_STAT) &
ICPU_MEMCTRL_STAT_PWR_DOWN_ACK))
;
/* Reset VCore-III, only. */
writel(ICPU_RESET_CORE_RST_FORCE, BASE_CFG + ICPU_RESET);
#else /* Luton || Ocelot */
register u32 resetbits = PERF_SOFT_RST_SOFT_CHIP_RST;
(void)readl(BASE_DEVCPU_GCB + PERF_SOFT_RST);
/* Make sure VCore is NOT protected from reset */
clrbits_le32(BASE_CFG + ICPU_RESET, ICPU_RESET_CORE_RST_PROTECT);
/* Change to SPI bitbang for SPI reset workaround... */
writel(ICPU_SW_MODE_SW_SPI_CS_OE(1) | ICPU_SW_MODE_SW_SPI_CS(1) |
ICPU_SW_MODE_SW_PIN_CTRL_MODE, BASE_CFG + ICPU_SW_MODE);
/* Do the global reset */
writel(resetbits, BASE_DEVCPU_GCB + PERF_SOFT_RST);
#endif
while (1)
; /* NOP */
}
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