| /* |
| * Copyright (c) 2020, MediaTek Inc. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <common/debug.h> |
| #include <drivers/delay_timer.h> |
| #include <lib/mmio.h> |
| |
| #include "platform_def.h" |
| #include "pmic_wrap_init.h" |
| |
| /* pmic wrap module wait_idle and read polling interval (in microseconds) */ |
| enum pwrap_polling_interval { |
| WAIT_IDLE_POLLING_DELAY_US = 1, |
| READ_POLLING_DELAY_US = 2 |
| }; |
| |
| static uint32_t pwrap_check_idle(void *wacs_register, uint32_t timeout_us) |
| { |
| uint32_t reg_rdata = 0U, retry; |
| |
| retry = (timeout_us + WAIT_IDLE_POLLING_DELAY_US) / |
| WAIT_IDLE_POLLING_DELAY_US; |
| while (retry != 0) { |
| udelay(WAIT_IDLE_POLLING_DELAY_US); |
| reg_rdata = mmio_read_32((uintptr_t)wacs_register); |
| /* if last read command timeout,clear vldclr bit |
| * read command state machine:FSM_REQ-->wfdle-->WFVLDCLR; |
| * write:FSM_REQ-->idle |
| */ |
| switch (GET_WACS_FSM(reg_rdata)) { |
| case SWINF_FSM_WFVLDCLR: |
| mmio_write_32((uintptr_t)&mtk_pwrap->wacs2_vldclr, 0x1); |
| INFO("WACS_FSM = SWINF_FSM_WFVLDCLR\n"); |
| break; |
| case SWINF_FSM_WFDLE: |
| INFO("WACS_FSM = SWINF_FSM_WFDLE\n"); |
| break; |
| case SWINF_FSM_REQ: |
| INFO("WACS_FSM = SWINF_FSM_REQ\n"); |
| break; |
| case SWINF_FSM_IDLE: |
| goto done; |
| default: |
| break; |
| } |
| retry--; |
| }; |
| |
| done: |
| if (retry == 0) { |
| /* timeout */ |
| return E_PWR_WAIT_IDLE_TIMEOUT; |
| } |
| |
| return 0U; |
| } |
| |
| static uint32_t pwrap_check_vldclr(void *wacs_register, uint32_t timeout_us) |
| { |
| uint32_t reg_rdata = 0U, retry; |
| |
| retry = (timeout_us + READ_POLLING_DELAY_US) / READ_POLLING_DELAY_US; |
| while (retry != 0) { |
| udelay(READ_POLLING_DELAY_US); |
| reg_rdata = mmio_read_32((uintptr_t)wacs_register); |
| if (GET_WACS_FSM(reg_rdata) == SWINF_FSM_WFVLDCLR) { |
| break; |
| } |
| retry--; |
| }; |
| |
| if (retry == 0) { |
| /* timeout */ |
| return E_PWR_WAIT_IDLE_TIMEOUT; |
| } |
| |
| return 0U; |
| } |
| |
| static int32_t pwrap_wacs2(uint32_t write, uint32_t adr, uint32_t wdata, |
| uint32_t *rdata, uint32_t init_check) |
| { |
| uint32_t reg_rdata, return_value; |
| |
| if (init_check != 0) { |
| if ((mmio_read_32((uintptr_t)&mtk_pwrap->init_done) & 0x1) == 0) { |
| ERROR("initialization isn't finished\n"); |
| return E_PWR_NOT_INIT_DONE; |
| } |
| } |
| |
| /* Wait for Software Interface FSM state to be IDLE. */ |
| return_value = pwrap_check_idle(&mtk_pwrap->wacs2_sta, |
| PWRAP_WAIT_IDLE_US); |
| if (return_value != 0) { |
| return return_value; |
| } |
| |
| /* Set the write data */ |
| if (write == 1) { |
| /* Set the write data. */ |
| mmio_write_32((uintptr_t)&mtk_pwrap->wacs2_wdata, wdata); |
| } |
| |
| /* Send the command. */ |
| mmio_write_32((uintptr_t)&mtk_pwrap->wacs2_cmd, (write << 29) | adr); |
| |
| if (write == 0) { |
| /* |
| * Wait for Software Interface FSM state to be WFVLDCLR, |
| * read the data and clear the valid flag. |
| */ |
| return_value = pwrap_check_vldclr(&mtk_pwrap->wacs2_sta, |
| PWRAP_READ_US); |
| if (return_value != 0) { |
| return return_value; |
| } |
| |
| if (rdata == NULL) { |
| return E_PWR_INVALID_ARG; |
| } |
| |
| reg_rdata = mmio_read_32((uintptr_t)&mtk_pwrap->wacs2_rdata); |
| *rdata = reg_rdata; |
| mmio_write_32((uintptr_t)&mtk_pwrap->wacs2_vldclr, 0x1); |
| } |
| |
| return return_value; |
| } |
| |
| /* external API for pmic_wrap user */ |
| int32_t pwrap_read(uint32_t adr, uint32_t *rdata) |
| { |
| return pwrap_wacs2(0, adr, 0, rdata, 1); |
| } |
| |
| int32_t pwrap_write(uint32_t adr, uint32_t wdata) |
| { |
| return pwrap_wacs2(1, adr, wdata, 0, 1); |
| } |