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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2020 Michael Tretter <m.tretter@pengutronix.de>
*/
#include <common.h>
#include <init.h>
#include <linux/types.h>
#include <reset_source.h>
#define ZYNQMP_CRL_APB_BASE 0xff5e0000
#define ZYNQMP_CRL_APB_RESET_REASON (ZYNQMP_CRL_APB_BASE + 0x220)
/* External POR: The PS_POR_B reset signal pin was asserted. */
#define ZYNQMP_CRL_APB_RESET_REASON_EXTERNAL BIT(0)
/* Internal POR: A system error triggered a POR reset. */
#define ZYNQMP_CRL_APB_RESET_REASON_INTERNAL BIT(1)
/* Internal system reset; A system error triggered a system reset. */
#define ZYNQMP_CRL_APB_RESET_REASON_PMU BIT(2)
/* PS-only reset: Write to PMU_GLOBAL.GLOBAL_RESET [PS_ONLY_RST]. */
#define ZYNQMP_CRL_APB_RESET_REASON_PSONLY BIT(3)
/* External system reset: The PS_SRST_B reset signal pin was asserted. */
#define ZYNQMP_CRL_APB_RESET_REASON_SRST BIT(4)
/* Software system reset: Write to RESET_CTRL [soft_reset]. */
#define ZYNQMP_CRL_APB_RESET_REASON_SOFT BIT(5)
/* Software debugger reset: Write to BLOCKONLY_RST [debug_only]. */
#define ZYNQMP_CRL_APB_RESET_REASON_DEBUG_SYS BIT(6)
struct zynqmp_reset_reason {
u32 mask;
enum reset_src_type type;
};
static const struct zynqmp_reset_reason reset_reasons[] = {
{ ZYNQMP_CRL_APB_RESET_REASON_DEBUG_SYS, RESET_JTAG },
{ ZYNQMP_CRL_APB_RESET_REASON_SOFT, RESET_RST },
{ ZYNQMP_CRL_APB_RESET_REASON_SRST, RESET_POR },
{ ZYNQMP_CRL_APB_RESET_REASON_PSONLY, RESET_POR },
{ ZYNQMP_CRL_APB_RESET_REASON_PMU, RESET_POR },
{ ZYNQMP_CRL_APB_RESET_REASON_INTERNAL, RESET_POR },
{ ZYNQMP_CRL_APB_RESET_REASON_EXTERNAL, RESET_POR },
{ /* sentinel */ }
};
static enum reset_src_type zynqmp_get_reset_src(void)
{
enum reset_src_type type = RESET_UKWN;
unsigned int i;
u32 val;
val = readl(ZYNQMP_CRL_APB_RESET_REASON);
for (i = 0; i < ARRAY_SIZE(reset_reasons); i++) {
if (val & reset_reasons[i].mask) {
type = reset_reasons[i].type;
break;
}
}
pr_info("ZynqMP reset reason %s (ZYNQMP_CRL_APB_RESET_REASON: 0x%08x)\n",
reset_source_to_string(type), val);
return type;
}
static int zynqmp_init(void)
{
reset_source_set(zynqmp_get_reset_src());
return 0;
}
postcore_initcall(zynqmp_init);
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