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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2026 Aurelien Jarno
* Authors:
* Aurelien Jarno <[email protected]>
*/
#include <libfdt.h>
#include <platform_override.h>
#include <sbi/sbi_bitops.h>
#include <sbi/sbi_console.h>
#include <sbi/sbi_system.h>
#include <sbi_utils/fdt/fdt_driver.h>
#include <sbi_utils/i2c/fdt_i2c.h>
/* SpacemiT P1 Power Control Register 2 */
#define PWR_CTRL2 0x7e
#define PWR_CTRL2_SHUTDOWN BIT(2) /* Shutdown request */
#define PWR_CTRL2_RST BIT(1) /* Reset request */
static struct i2c_adapter *p1_adapter = NULL;
static uint32_t p1_reg = 0;
static int p1_system_reset_check(uint32_t type, uint32_t reason)
{
switch (type) {
case SBI_SRST_RESET_TYPE_SHUTDOWN:
return 1;
case SBI_SRST_RESET_TYPE_COLD_REBOOT:
case SBI_SRST_RESET_TYPE_WARM_REBOOT:
return 255;
}
return 0;
}
static void p1_ops(uint32_t type)
{
uint8_t byte;
int rc;
rc = i2c_adapter_reg_read(p1_adapter, p1_reg, PWR_CTRL2, &byte);
if (rc) {
sbi_printf("%s: cannot read P1 Power Control Register 2\n", __func__);
return;
}
if (type == SBI_SRST_RESET_TYPE_SHUTDOWN)
byte |= PWR_CTRL2_SHUTDOWN;
else
byte |= PWR_CTRL2_RST;
rc = i2c_adapter_reg_write(p1_adapter, p1_reg, PWR_CTRL2, byte);
if (rc)
sbi_printf("%s: cannot write P1 Power Control Register 2\n", __func__);
}
static void p1_system_reset(uint32_t type, uint32_t reason)
{
switch (type) {
case SBI_SRST_RESET_TYPE_SHUTDOWN:
case SBI_SRST_RESET_TYPE_COLD_REBOOT:
case SBI_SRST_RESET_TYPE_WARM_REBOOT:
p1_ops(type);
break;
}
}
static struct sbi_system_reset_device p1_reset = {
.name = "spacemit-p1-reset",
.system_reset_check = p1_system_reset_check,
.system_reset = p1_system_reset
};
static int p1_reset_init(const void *fdt, int nodeoff,
const struct fdt_match *match)
{
int rc, i2c_bus;
uint64_t addr;
/* we are spacemit,p1 node */
rc = fdt_get_node_addr_size(fdt, nodeoff, 0, &addr, NULL);
if (rc)
return rc;
p1_reg = addr;
/* find i2c bus parent node */
i2c_bus = fdt_parent_offset(fdt, nodeoff);
if (i2c_bus < 0)
return i2c_bus;
/* i2c adapter get */
rc = fdt_i2c_adapter_get(fdt, i2c_bus, &p1_adapter);
if (rc)
return rc;
sbi_system_reset_add_device(&p1_reset);
return 0;
}
static const struct fdt_match p1_reset_match[] = {
{ .compatible = "spacemit,p1" },
{ },
};
const struct fdt_driver fdt_reset_spacemit_p1 = {
.match_table = p1_reset_match,
.init = p1_reset_init,
};
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