developer | 6f37fd2 | 2019-05-02 20:02:05 +0800 | [diff] [blame] | 1 | /* |
developer | fe14b9f | 2022-09-05 11:18:04 +0800 | [diff] [blame^] | 2 | * Copyright (c) 2019-2022, MediaTek Inc. All rights reserved. |
developer | 6f37fd2 | 2019-05-02 20:02:05 +0800 | [diff] [blame] | 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <common/debug.h> |
| 8 | #include <drivers/delay_timer.h> |
| 9 | #include <lib/mmio.h> |
| 10 | #include <platform_def.h> |
| 11 | #include <pmic_wrap_init.h> |
| 12 | |
| 13 | /* pmic wrap module wait_idle and read polling interval (in microseconds) */ |
| 14 | enum { |
| 15 | WAIT_IDLE_POLLING_DELAY_US = 1, |
| 16 | READ_POLLING_DELAY_US = 2 |
| 17 | }; |
| 18 | |
| 19 | static inline uint32_t wait_for_state_idle(uint32_t timeout_us, |
| 20 | void *wacs_register, |
| 21 | void *wacs_vldclr_register, |
| 22 | uint32_t *read_reg) |
| 23 | { |
| 24 | uint32_t reg_rdata; |
| 25 | uint32_t retry; |
| 26 | |
| 27 | retry = (timeout_us + WAIT_IDLE_POLLING_DELAY_US) / |
| 28 | WAIT_IDLE_POLLING_DELAY_US; |
| 29 | |
| 30 | do { |
| 31 | udelay(WAIT_IDLE_POLLING_DELAY_US); |
| 32 | reg_rdata = mmio_read_32((uintptr_t)wacs_register); |
| 33 | /* if last read command timeout,clear vldclr bit |
| 34 | * read command state machine:FSM_REQ-->wfdle-->WFVLDCLR; |
| 35 | * write:FSM_REQ-->idle |
| 36 | */ |
| 37 | switch (((reg_rdata >> RDATA_WACS_FSM_SHIFT) & |
| 38 | RDATA_WACS_FSM_MASK)) { |
| 39 | case WACS_FSM_WFVLDCLR: |
| 40 | mmio_write_32((uintptr_t)wacs_vldclr_register, 1); |
| 41 | ERROR("WACS_FSM = PMIC_WRAP_WACS_VLDCLR\n"); |
| 42 | break; |
| 43 | case WACS_FSM_WFDLE: |
| 44 | ERROR("WACS_FSM = WACS_FSM_WFDLE\n"); |
| 45 | break; |
| 46 | case WACS_FSM_REQ: |
| 47 | ERROR("WACS_FSM = WACS_FSM_REQ\n"); |
| 48 | break; |
| 49 | case WACS_FSM_IDLE: |
| 50 | goto done; |
| 51 | default: |
| 52 | break; |
| 53 | } |
| 54 | |
| 55 | retry--; |
| 56 | } while (retry); |
| 57 | |
| 58 | done: |
| 59 | if (!retry) /* timeout */ |
| 60 | return E_PWR_WAIT_IDLE_TIMEOUT; |
| 61 | |
| 62 | if (read_reg) |
| 63 | *read_reg = reg_rdata; |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | static inline uint32_t wait_for_state_ready(uint32_t timeout_us, |
| 68 | void *wacs_register, |
| 69 | uint32_t *read_reg) |
| 70 | { |
| 71 | uint32_t reg_rdata; |
| 72 | uint32_t retry; |
| 73 | |
| 74 | retry = (timeout_us + READ_POLLING_DELAY_US) / READ_POLLING_DELAY_US; |
| 75 | |
| 76 | do { |
| 77 | udelay(READ_POLLING_DELAY_US); |
| 78 | reg_rdata = mmio_read_32((uintptr_t)wacs_register); |
| 79 | |
| 80 | if (((reg_rdata >> RDATA_WACS_FSM_SHIFT) & RDATA_WACS_FSM_MASK) |
| 81 | == WACS_FSM_WFVLDCLR) |
| 82 | break; |
| 83 | |
| 84 | retry--; |
| 85 | } while (retry); |
| 86 | |
| 87 | if (!retry) { /* timeout */ |
| 88 | ERROR("timeout when waiting for idle\n"); |
| 89 | return E_PWR_WAIT_IDLE_TIMEOUT_READ; |
| 90 | } |
| 91 | |
| 92 | if (read_reg) |
| 93 | *read_reg = reg_rdata; |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | static int32_t pwrap_wacs2(uint32_t write, |
| 98 | uint32_t adr, |
| 99 | uint32_t wdata, |
| 100 | uint32_t *rdata, |
| 101 | uint32_t init_check) |
| 102 | { |
| 103 | uint32_t reg_rdata = 0; |
| 104 | uint32_t wacs_write = 0; |
| 105 | uint32_t wacs_adr = 0; |
| 106 | uint32_t wacs_cmd = 0; |
| 107 | uint32_t return_value = 0; |
| 108 | |
| 109 | if (init_check) { |
| 110 | reg_rdata = mmio_read_32((uintptr_t)&mtk_pwrap->wacs2_rdata); |
| 111 | /* Prevent someone to used pwrap before pwrap init */ |
| 112 | if (((reg_rdata >> RDATA_INIT_DONE_SHIFT) & |
| 113 | RDATA_INIT_DONE_MASK) != WACS_INIT_DONE) { |
| 114 | ERROR("initialization isn't finished\n"); |
| 115 | return E_PWR_NOT_INIT_DONE; |
| 116 | } |
| 117 | } |
| 118 | reg_rdata = 0; |
| 119 | /* Check IDLE in advance */ |
| 120 | return_value = wait_for_state_idle(TIMEOUT_WAIT_IDLE, |
| 121 | &mtk_pwrap->wacs2_rdata, |
| 122 | &mtk_pwrap->wacs2_vldclr, |
| 123 | 0); |
| 124 | if (return_value != 0) { |
| 125 | ERROR("wait_for_fsm_idle fail,return_value=%d\n", return_value); |
| 126 | goto FAIL; |
| 127 | } |
| 128 | wacs_write = write << 31; |
| 129 | wacs_adr = (adr >> 1) << 16; |
| 130 | wacs_cmd = wacs_write | wacs_adr | wdata; |
| 131 | |
| 132 | mmio_write_32((uintptr_t)&mtk_pwrap->wacs2_cmd, wacs_cmd); |
| 133 | if (write == 0) { |
| 134 | if (rdata == NULL) { |
| 135 | ERROR("rdata is a NULL pointer\n"); |
| 136 | return_value = E_PWR_INVALID_ARG; |
| 137 | goto FAIL; |
| 138 | } |
| 139 | return_value = wait_for_state_ready(TIMEOUT_READ, |
| 140 | &mtk_pwrap->wacs2_rdata, |
| 141 | ®_rdata); |
| 142 | if (return_value != 0) { |
| 143 | ERROR("wait_for_fsm_vldclr fail,return_value=%d\n", |
| 144 | return_value); |
| 145 | goto FAIL; |
| 146 | } |
| 147 | *rdata = ((reg_rdata >> RDATA_WACS_RDATA_SHIFT) |
| 148 | & RDATA_WACS_RDATA_MASK); |
| 149 | mmio_write_32((uintptr_t)&mtk_pwrap->wacs2_vldclr, 1); |
| 150 | } |
| 151 | FAIL: |
| 152 | return return_value; |
| 153 | } |
| 154 | |
| 155 | /* external API for pmic_wrap user */ |
| 156 | |
| 157 | int32_t pwrap_read(uint32_t adr, uint32_t *rdata) |
| 158 | { |
| 159 | return pwrap_wacs2(0, adr, 0, rdata, 1); |
| 160 | } |
| 161 | |
| 162 | int32_t pwrap_write(uint32_t adr, uint32_t wdata) |
| 163 | { |
| 164 | return pwrap_wacs2(1, adr, wdata, 0, 1); |
| 165 | } |