1 /*
2 * (C) Copyright 2012 Stephen Warren
3 *
4 * See file CREDITS for list of people who contributed to this
5 * project.
6 *
7 * SPDX-License-Identifier: GPL-2.0
8 */
9
10 #include <common.h>
11 #include <asm/io.h>
12 #include <asm/arch/wdog.h>
13 #include <efi_loader.h>
14
15 #define RESET_TIMEOUT 10
16
17 /*
18 * The Raspberry Pi firmware uses the RSTS register to know which partiton
19 * to boot from. The partiton value is spread into bits 0, 2, 4, 6, 8, 10.
20 * Partiton 63 is a special partition used by the firmware to indicate halt.
21 */
22 #define BCM2835_WDOG_RSTS_RASPBERRYPI_HALT 0x555
23
24 /* max ticks timeout */
25 #define BCM2835_WDOG_MAX_TIMEOUT 0x000fffff
26
27 #ifdef CONFIG_BCM2835_WDT
28 extern void hw_watchdog_disable(void);
29 #else
hw_watchdog_disable(void)30 void hw_watchdog_disable(void) {}
31 #endif
32
33 __efi_runtime_data struct bcm2835_wdog_regs *wdog_regs =
34 (struct bcm2835_wdog_regs *)BCM2835_WDOG_PHYSADDR;
35
reset_cpu(ulong ticks)36 void __efi_runtime reset_cpu(ulong ticks)
37 {
38 uint32_t rstc, timeout;
39
40 if (ticks == 0) {
41 hw_watchdog_disable();
42 timeout = RESET_TIMEOUT;
43 } else
44 timeout = ticks & BCM2835_WDOG_MAX_TIMEOUT;
45
46 rstc = readl(&wdog_regs->rstc);
47 rstc &= ~BCM2835_WDOG_RSTC_WRCFG_MASK;
48 rstc |= BCM2835_WDOG_RSTC_WRCFG_FULL_RESET;
49
50 writel(BCM2835_WDOG_PASSWORD | timeout, &wdog_regs->wdog);
51 writel(BCM2835_WDOG_PASSWORD | rstc, &wdog_regs->rstc);
52 }
53
54 #ifdef CONFIG_EFI_LOADER
55
efi_reset_system(enum efi_reset_type reset_type,efi_status_t reset_status,unsigned long data_size,void * reset_data)56 void __efi_runtime EFIAPI efi_reset_system(
57 enum efi_reset_type reset_type,
58 efi_status_t reset_status,
59 unsigned long data_size, void *reset_data)
60 {
61 u32 val;
62
63 switch (reset_type) {
64 case EFI_RESET_COLD:
65 case EFI_RESET_WARM:
66 reset_cpu(0);
67 break;
68 case EFI_RESET_SHUTDOWN:
69 /*
70 * We set the watchdog hard reset bit here to distinguish this reset
71 * from the normal (full) reset. bootcode.bin will not reboot after a
72 * hard reset.
73 */
74 val = readl(&wdog_regs->rsts);
75 val |= BCM2835_WDOG_PASSWORD;
76 val |= BCM2835_WDOG_RSTS_RASPBERRYPI_HALT;
77 writel(val, &wdog_regs->rsts);
78 reset_cpu(0);
79 break;
80 }
81
82 while (1) { }
83 }
84
efi_reset_system_init(void)85 void efi_reset_system_init(void)
86 {
87 efi_add_runtime_mmio(&wdog_regs, sizeof(*wdog_regs));
88 }
89
90 #endif
91