developer | 6f37fd2 | 2019-05-02 20:02:05 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2019, MediaTek Inc. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <common/debug.h> |
| 8 | #include <drivers/delay_timer.h> |
| 9 | |
| 10 | #include <pmic_wrap_init.h> |
| 11 | #include <rtc.h> |
| 12 | |
| 13 | /* RTC busy status polling interval and retry count */ |
| 14 | enum { |
| 15 | RTC_WRTGR_POLLING_DELAY_MS = 10, |
| 16 | RTC_WRTGR_POLLING_CNT = 100 |
| 17 | }; |
| 18 | |
| 19 | uint16_t RTC_Read(uint32_t addr) |
| 20 | { |
| 21 | uint32_t rdata = 0; |
| 22 | |
| 23 | pwrap_read((uint32_t)addr, &rdata); |
| 24 | return (uint16_t)rdata; |
| 25 | } |
| 26 | |
| 27 | void RTC_Write(uint32_t addr, uint16_t data) |
| 28 | { |
| 29 | pwrap_write((uint32_t)addr, (uint32_t)data); |
| 30 | } |
| 31 | |
| 32 | int32_t rtc_busy_wait(void) |
| 33 | { |
| 34 | uint64_t retry = RTC_WRTGR_POLLING_CNT; |
| 35 | |
| 36 | do { |
| 37 | mdelay(RTC_WRTGR_POLLING_DELAY_MS); |
| 38 | if (!(RTC_Read(RTC_BBPU) & RTC_BBPU_CBUSY)) |
| 39 | return 1; |
| 40 | retry--; |
| 41 | } while (retry); |
| 42 | |
| 43 | ERROR("[RTC] rtc cbusy time out!\n"); |
| 44 | return 0; |
| 45 | } |
| 46 | |
| 47 | int32_t RTC_Write_Trigger(void) |
| 48 | { |
| 49 | RTC_Write(RTC_WRTGR, 1); |
| 50 | return rtc_busy_wait(); |
| 51 | } |
| 52 | |
| 53 | int32_t Writeif_unlock(void) |
| 54 | { |
| 55 | RTC_Write(RTC_PROT, RTC_PROT_UNLOCK1); |
| 56 | if (!RTC_Write_Trigger()) |
| 57 | return 0; |
| 58 | RTC_Write(RTC_PROT, RTC_PROT_UNLOCK2); |
| 59 | if (!RTC_Write_Trigger()) |
| 60 | return 0; |
| 61 | |
| 62 | return 1; |
| 63 | } |
| 64 | |