| Caesar Wang | b400374 | 2016-10-12 08:10:12 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions are met: |
| 6 | * |
| 7 | * Redistributions of source code must retain the above copyright notice, this |
| 8 | * list of conditions and the following disclaimer. |
| 9 | * |
| 10 | * Redistributions in binary form must reproduce the above copyright notice, |
| 11 | * this list of conditions and the following disclaimer in the documentation |
| 12 | * and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * Neither the name of ARM nor the names of its contributors may be used |
| 15 | * to endorse or promote products derived from this software without specific |
| 16 | * prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| 22 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 23 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 24 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 28 | * POSSIBILITY OF SUCH DAMAGE. |
| 29 | */ |
| 30 | |
| 31 | #include "rk3399_mcu.h" |
| 32 | |
| 33 | #define PMU_PWRMODE_CON 0x20 |
| 34 | #define PMU_POWER_ST 0x78 |
| 35 | |
| 36 | #define M0_SCR 0xe000ed10 /* System Control Register (SCR) */ |
| 37 | |
| 38 | #define SCR_SLEEPDEEP_SHIFT (1 << 2) |
| 39 | |
| 40 | static void system_wakeup(void) |
| 41 | { |
| 42 | unsigned int status_value; |
| 43 | unsigned int mode_con; |
| 44 | |
| 45 | while (1) { |
| 46 | status_value = readl(PMU_BASE + PMU_POWER_ST); |
| 47 | if (status_value) { |
| 48 | mode_con = readl(PMU_BASE + PMU_PWRMODE_CON); |
| 49 | writel(mode_con & (~0x01), |
| 50 | PMU_BASE + PMU_PWRMODE_CON); |
| 51 | return; |
| 52 | } |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | int main(void) |
| 57 | { |
| 58 | unsigned int reg_src; |
| 59 | |
| 60 | system_wakeup(); |
| 61 | |
| 62 | reg_src = readl(M0_SCR); |
| 63 | |
| 64 | /* m0 enter deep sleep mode */ |
| 65 | writel(reg_src | SCR_SLEEPDEEP_SHIFT, M0_SCR); |
| 66 | |
| 67 | for (;;) |
| 68 | __asm volatile("wfi"); |
| 69 | |
| 70 | return 0; |
| 71 | } |