mirror of
https://github.com/riscv-software-src/opensbi.git
synced 2026-05-23 14:21:32 +01:00
Samuel Holland
547a5bbda7
Some drivers inherited FDT match data from the GPIO/syscon reset drivers, but do not use it for anything. Remove it to avoid confusion. Signed-off-by: Samuel Holland <samuel.holland@sifive.com> Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20260513224414.1078791-1-samuel.holland@sifive.com Signed-off-by: Anup Patel <anup@brainfault.org>
113 lines
2.4 KiB
C
113 lines
2.4 KiB
C
/*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* Copyright (c) 2026 Aurelien Jarno
|
|
* Authors:
|
|
* Aurelien Jarno <aurelien@aurel32.net>
|
|
*/
|
|
|
|
#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,
|
|
};
|