developer | 65014b8 | 2015-04-13 14:47:57 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved. |
| 3 | * |
dp-arm | fa3cf0b | 2017-05-03 09:38:09 +0100 | [diff] [blame] | 4 | * SPDX-License-Identifier: BSD-3-Clause |
developer | 65014b8 | 2015-04-13 14:47:57 +0800 | [diff] [blame] | 5 | */ |
| 6 | #include <debug.h> |
| 7 | #include <delay_timer.h> |
| 8 | #include <mmio.h> |
| 9 | #include <mt8173_def.h> |
| 10 | #include <pmic_wrap_init.h> |
| 11 | |
| 12 | /* pmic wrap module wait_idle and read polling interval (in microseconds) */ |
| 13 | enum { |
| 14 | WAIT_IDLE_POLLING_DELAY_US = 1, |
| 15 | READ_POLLING_DELAY_US = 2 |
| 16 | }; |
| 17 | |
| 18 | static inline uint32_t wait_for_state_idle(uint32_t timeout_us, |
| 19 | void *wacs_register, |
| 20 | void *wacs_vldclr_register, |
| 21 | uint32_t *read_reg) |
| 22 | { |
| 23 | uint32_t reg_rdata; |
| 24 | uint32_t retry; |
| 25 | |
| 26 | retry = (timeout_us + WAIT_IDLE_POLLING_DELAY_US) / |
| 27 | WAIT_IDLE_POLLING_DELAY_US; |
| 28 | |
| 29 | do { |
| 30 | udelay(WAIT_IDLE_POLLING_DELAY_US); |
| 31 | reg_rdata = mmio_read_32((uintptr_t)wacs_register); |
| 32 | /* if last read command timeout,clear vldclr bit |
| 33 | read command state machine:FSM_REQ-->wfdle-->WFVLDCLR; |
| 34 | write:FSM_REQ-->idle */ |
| 35 | switch (((reg_rdata >> RDATA_WACS_FSM_SHIFT) & |
| 36 | RDATA_WACS_FSM_MASK)) { |
| 37 | case WACS_FSM_WFVLDCLR: |
| 38 | mmio_write_32((uintptr_t)wacs_vldclr_register, 1); |
| 39 | ERROR("WACS_FSM = PMIC_WRAP_WACS_VLDCLR\n"); |
| 40 | break; |
| 41 | case WACS_FSM_WFDLE: |
| 42 | ERROR("WACS_FSM = WACS_FSM_WFDLE\n"); |
| 43 | break; |
| 44 | case WACS_FSM_REQ: |
| 45 | ERROR("WACS_FSM = WACS_FSM_REQ\n"); |
| 46 | break; |
| 47 | case WACS_FSM_IDLE: |
| 48 | goto done; |
| 49 | default: |
| 50 | break; |
| 51 | } |
| 52 | |
| 53 | retry--; |
| 54 | } while (retry); |
| 55 | |
| 56 | done: |
| 57 | if (!retry) /* timeout */ |
| 58 | return E_PWR_WAIT_IDLE_TIMEOUT; |
| 59 | |
| 60 | if (read_reg) |
| 61 | *read_reg = reg_rdata; |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | static inline uint32_t wait_for_state_ready(uint32_t timeout_us, |
| 66 | void *wacs_register, |
| 67 | uint32_t *read_reg) |
| 68 | { |
| 69 | uint32_t reg_rdata; |
| 70 | uint32_t retry; |
| 71 | |
| 72 | retry = (timeout_us + READ_POLLING_DELAY_US) / READ_POLLING_DELAY_US; |
| 73 | |
| 74 | do { |
| 75 | udelay(READ_POLLING_DELAY_US); |
| 76 | reg_rdata = mmio_read_32((uintptr_t)wacs_register); |
| 77 | |
| 78 | if (((reg_rdata >> RDATA_WACS_FSM_SHIFT) & RDATA_WACS_FSM_MASK) |
| 79 | == WACS_FSM_WFVLDCLR) |
| 80 | break; |
| 81 | |
| 82 | retry--; |
| 83 | } while (retry); |
| 84 | |
| 85 | if (!retry) { /* timeout */ |
| 86 | ERROR("timeout when waiting for idle\n"); |
| 87 | return E_PWR_WAIT_IDLE_TIMEOUT_READ; |
| 88 | } |
| 89 | |
| 90 | if (read_reg) |
| 91 | *read_reg = reg_rdata; |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | static int32_t pwrap_wacs2(uint32_t write, |
| 96 | uint32_t adr, |
| 97 | uint32_t wdata, |
| 98 | uint32_t *rdata, |
| 99 | uint32_t init_check) |
| 100 | { |
| 101 | uint32_t reg_rdata = 0; |
| 102 | uint32_t wacs_write = 0; |
| 103 | uint32_t wacs_adr = 0; |
| 104 | uint32_t wacs_cmd = 0; |
| 105 | uint32_t return_value = 0; |
| 106 | |
| 107 | if (init_check) { |
| 108 | reg_rdata = mmio_read_32((uintptr_t)&mt8173_pwrap->wacs2_rdata); |
| 109 | /* Prevent someone to used pwrap before pwrap init */ |
| 110 | if (((reg_rdata >> RDATA_INIT_DONE_SHIFT) & |
| 111 | RDATA_INIT_DONE_MASK) != WACS_INIT_DONE) { |
| 112 | ERROR("initialization isn't finished\n"); |
| 113 | return E_PWR_NOT_INIT_DONE; |
| 114 | } |
| 115 | } |
| 116 | reg_rdata = 0; |
| 117 | /* Check IDLE in advance */ |
| 118 | return_value = wait_for_state_idle(TIMEOUT_WAIT_IDLE, |
| 119 | &mt8173_pwrap->wacs2_rdata, |
| 120 | &mt8173_pwrap->wacs2_vldclr, |
| 121 | 0); |
| 122 | if (return_value != 0) { |
| 123 | ERROR("wait_for_fsm_idle fail,return_value=%d\n", return_value); |
| 124 | goto FAIL; |
| 125 | } |
| 126 | wacs_write = write << 31; |
| 127 | wacs_adr = (adr >> 1) << 16; |
| 128 | wacs_cmd = wacs_write | wacs_adr | wdata; |
| 129 | |
| 130 | mmio_write_32((uintptr_t)&mt8173_pwrap->wacs2_cmd, wacs_cmd); |
| 131 | if (write == 0) { |
| 132 | if (NULL == rdata) { |
| 133 | ERROR("rdata is a NULL pointer\n"); |
| 134 | return_value = E_PWR_INVALID_ARG; |
| 135 | goto FAIL; |
| 136 | } |
| 137 | return_value = wait_for_state_ready(TIMEOUT_READ, |
| 138 | &mt8173_pwrap->wacs2_rdata, |
| 139 | ®_rdata); |
| 140 | if (return_value != 0) { |
| 141 | ERROR("wait_for_fsm_vldclr fail,return_value=%d\n", |
| 142 | return_value); |
| 143 | goto FAIL; |
| 144 | } |
| 145 | *rdata = ((reg_rdata >> RDATA_WACS_RDATA_SHIFT) |
| 146 | & RDATA_WACS_RDATA_MASK); |
| 147 | mmio_write_32((uintptr_t)&mt8173_pwrap->wacs2_vldclr, 1); |
| 148 | } |
| 149 | FAIL: |
| 150 | return return_value; |
| 151 | } |
| 152 | |
| 153 | /* external API for pmic_wrap user */ |
| 154 | |
| 155 | int32_t pwrap_read(uint32_t adr, uint32_t *rdata) |
| 156 | { |
| 157 | return pwrap_wacs2(0, adr, 0, rdata, 1); |
| 158 | } |
| 159 | |
| 160 | int32_t pwrap_write(uint32_t adr, uint32_t wdata) |
| 161 | { |
| 162 | return pwrap_wacs2(1, adr, wdata, 0, 1); |
| 163 | } |