1*f29d1e0cSSheetal Tigadoli /* 2*f29d1e0cSSheetal Tigadoli * Copyright (c) 2017-2020, Broadcom 3*f29d1e0cSSheetal Tigadoli * 4*f29d1e0cSSheetal Tigadoli * SPDX-License-Identifier: BSD-3-Clause 5*f29d1e0cSSheetal Tigadoli */ 6*f29d1e0cSSheetal Tigadoli 7*f29d1e0cSSheetal Tigadoli #include <arch_helpers.h> 8*f29d1e0cSSheetal Tigadoli #include <common/bl_common.h> 9*f29d1e0cSSheetal Tigadoli #include <drivers/delay_timer.h> 10*f29d1e0cSSheetal Tigadoli 11*f29d1e0cSSheetal Tigadoli #include <platform_def.h> 12*f29d1e0cSSheetal Tigadoli #include <scp.h> 13*f29d1e0cSSheetal Tigadoli #include <scp_cmd.h> 14*f29d1e0cSSheetal Tigadoli 15*f29d1e0cSSheetal Tigadoli #include "m0_ipc.h" 16*f29d1e0cSSheetal Tigadoli 17*f29d1e0cSSheetal Tigadoli /* 18*f29d1e0cSSheetal Tigadoli * Reads a response from CRMU MAILBOX 19*f29d1e0cSSheetal Tigadoli * Assumes that access has been granted and locked. 20*f29d1e0cSSheetal Tigadoli * Note that this is just a temporary implementation until 21*f29d1e0cSSheetal Tigadoli * channels are introduced 22*f29d1e0cSSheetal Tigadoli */ scp_read_response(crmu_response_t * resp)23*f29d1e0cSSheetal Tigadolistatic void scp_read_response(crmu_response_t *resp) 24*f29d1e0cSSheetal Tigadoli { 25*f29d1e0cSSheetal Tigadoli uint32_t code; 26*f29d1e0cSSheetal Tigadoli 27*f29d1e0cSSheetal Tigadoli code = mmio_read_32(CRMU_MAIL_BOX0); 28*f29d1e0cSSheetal Tigadoli resp->completed = code & MCU_IPC_CMD_DONE_MASK; 29*f29d1e0cSSheetal Tigadoli resp->cmd = code & SCP_CMD_MASK; 30*f29d1e0cSSheetal Tigadoli resp->ret = (code & MCU_IPC_CMD_REPLY_MASK) >> MCU_IPC_CMD_REPLY_SHIFT; 31*f29d1e0cSSheetal Tigadoli } 32*f29d1e0cSSheetal Tigadoli 33*f29d1e0cSSheetal Tigadoli /* 34*f29d1e0cSSheetal Tigadoli * Send a command to SCP and wait for timeout us. 35*f29d1e0cSSheetal Tigadoli * Return: 0 on success 36*f29d1e0cSSheetal Tigadoli * -1 if there was no proper reply from SCP 37*f29d1e0cSSheetal Tigadoli * >0 if there was a response from MCU, but 38*f29d1e0cSSheetal Tigadoli * command completed with an error. 39*f29d1e0cSSheetal Tigadoli */ scp_send_cmd(uint32_t cmd,uint32_t param,uint32_t timeout)40*f29d1e0cSSheetal Tigadoliint scp_send_cmd(uint32_t cmd, uint32_t param, uint32_t timeout) 41*f29d1e0cSSheetal Tigadoli { 42*f29d1e0cSSheetal Tigadoli int ret = -1; 43*f29d1e0cSSheetal Tigadoli 44*f29d1e0cSSheetal Tigadoli mmio_write_32(CRMU_MAIL_BOX0, cmd); 45*f29d1e0cSSheetal Tigadoli mmio_write_32(CRMU_MAIL_BOX1, param); 46*f29d1e0cSSheetal Tigadoli do { 47*f29d1e0cSSheetal Tigadoli crmu_response_t scp_resp; 48*f29d1e0cSSheetal Tigadoli 49*f29d1e0cSSheetal Tigadoli udelay(1); 50*f29d1e0cSSheetal Tigadoli scp_read_response(&scp_resp); 51*f29d1e0cSSheetal Tigadoli if (scp_resp.completed && 52*f29d1e0cSSheetal Tigadoli (scp_resp.cmd == cmd)) { 53*f29d1e0cSSheetal Tigadoli /* This command has completed */ 54*f29d1e0cSSheetal Tigadoli ret = scp_resp.ret; 55*f29d1e0cSSheetal Tigadoli break; 56*f29d1e0cSSheetal Tigadoli } 57*f29d1e0cSSheetal Tigadoli } while (--timeout); 58*f29d1e0cSSheetal Tigadoli 59*f29d1e0cSSheetal Tigadoli return ret; 60*f29d1e0cSSheetal Tigadoli } 61