1 /* 2 * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <arch_helpers.h> 8 #include <assert.h> 9 #include <debug.h> 10 #include <delay_timer.h> 11 #include <mmio.h> 12 #include <platform.h> 13 #include <platform_def.h> 14 #include <psci.h> 15 #include <sunxi_mmap.h> 16 17 #define SUNXI_WDOG0_CTRL_REG (SUNXI_WDOG_BASE + 0x0010) 18 #define SUNXI_WDOG0_CFG_REG (SUNXI_WDOG_BASE + 0x0014) 19 #define SUNXI_WDOG0_MODE_REG (SUNXI_WDOG_BASE + 0x0018) 20 21 static void __dead2 sunxi_system_off(void) 22 { 23 ERROR("PSCI: Full shutdown not implemented, halting\n"); 24 wfi(); 25 panic(); 26 } 27 28 static void __dead2 sunxi_system_reset(void) 29 { 30 /* Reset the whole system when the watchdog times out */ 31 mmio_write_32(SUNXI_WDOG0_CFG_REG, 1); 32 /* Enable the watchdog with the shortest timeout (0.5 seconds) */ 33 mmio_write_32(SUNXI_WDOG0_MODE_REG, (0 << 4) | 1); 34 /* Wait for twice the watchdog timeout before panicking */ 35 mdelay(1000); 36 37 ERROR("PSCI: System reset failed\n"); 38 wfi(); 39 panic(); 40 } 41 42 static plat_psci_ops_t sunxi_psci_ops = { 43 .system_off = sunxi_system_off, 44 .system_reset = sunxi_system_reset, 45 }; 46 47 int plat_setup_psci_ops(uintptr_t sec_entrypoint, 48 const plat_psci_ops_t **psci_ops) 49 { 50 assert(psci_ops); 51 52 *psci_ops = &sunxi_psci_ops; 53 54 return 0; 55 } 56