blob: 9a921c4a95d11ecfe9e2e589eb7c2774fc3c4073 [file] [log] [blame]
/*
* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <mmio.h>
#include <utils_def.h>
#include "uniphier.h"
#define UNIPHIER_ROM_RSV3 0x5980120c
#define UNIPHIER_STMBE2COM 0x5f800030
#define UNIPHIER_BETOSTMIRQ0PT 0x5f800070
#define UNIPHIER_SCP_READY_MAGIC 0x0000b6a5
#define UNIPHIER_SCP_PACKET_START 0xA0
#define UNIPHIER_SCP_PACKET_END 0xA5
#define UNIPHIER_SCP_PACKET_ESC 0xA6
#define UNIPHIER_SCP_IS_CTRL_CODE(c) (0xA0 <= (c) && (c) <= 0xA6)
int uniphier_scp_is_running(void)
{
return mmio_read_32(UNIPHIER_STMBE2COM) == UNIPHIER_SCP_READY_MAGIC;
}
void uniphier_scp_start(void)
{
uint32_t tmp;
mmio_write_32(UNIPHIER_STMBE2COM + 4, UNIPHIER_SCP_BASE);
mmio_write_32(UNIPHIER_STMBE2COM, UNIPHIER_SCP_READY_MAGIC);
do {
tmp = mmio_read_32(UNIPHIER_ROM_RSV3);
} while (!(tmp & BIT(8)));
mmio_write_32(UNIPHIER_ROM_RSV3, tmp | BIT(9));
}
static void uniphier_scp_send_packet(const uint8_t *packet, int packet_len)
{
uintptr_t reg = UNIPHIER_STMBE2COM;
uint32_t word;
int len, i;
while (packet_len) {
len = MIN(packet_len, 4);
word = 0;
for (i = 0; i < len; i++)
word |= *packet++ << (8 * i);
mmio_write_32(reg, word);
reg += 4;
packet_len -= len;
}
mmio_write_8(UNIPHIER_BETOSTMIRQ0PT, 0x55);
}
static void uniphier_scp_send_cmd(const uint8_t *cmd, int cmd_len)
{
uint8_t packet[32]; /* long enough */
uint8_t *p = packet;
uint8_t c;
int i;
*p++ = UNIPHIER_SCP_PACKET_START;
*p++ = cmd_len;
for (i = 0; i < cmd_len; i++) {
c = *cmd++;
if (UNIPHIER_SCP_IS_CTRL_CODE(c)) {
*p++ = UNIPHIER_SCP_PACKET_ESC;
*p++ = c ^ BIT(7);
} else {
*p++ = c;
}
}
*p++ = UNIPHIER_SCP_PACKET_END;
uniphier_scp_send_packet(packet, p - packet);
}
#define UNIPHIER_SCP_CMD(name, ...) \
static const uint8_t __uniphier_scp_##name##_cmd[] = { \
__VA_ARGS__ \
}; \
void uniphier_scp_##name(void) \
{ \
uniphier_scp_send_cmd(__uniphier_scp_##name##_cmd, \
ARRAY_SIZE(__uniphier_scp_##name##_cmd)); \
}
UNIPHIER_SCP_CMD(open_com, 0x00, 0x00, 0x05)
UNIPHIER_SCP_CMD(system_off, 0x00, 0x01, 0xff, 0xff, 0xff, 0xff, 0x01)
UNIPHIER_SCP_CMD(system_reset, 0x00, 0x02, 0x00)