1 // SPDX-License-Identifier: GPL-2.0-only 2 // Copyright (C) 2012-2014 Broadcom Corporation 3 4 #include <linux/clocksource.h> 5 #include <linux/of_address.h> 6 7 #include <asm/mach/arch.h> 8 9 #include "kona_l2_cache.h" 10 11 #define SECWDOG_OFFSET 0x00000000 12 #define SECWDOG_RESERVED_MASK 0xe2000000 13 #define SECWDOG_WD_LOAD_FLAG_MASK 0x10000000 14 #define SECWDOG_EN_MASK 0x08000000 15 #define SECWDOG_SRSTEN_MASK 0x04000000 16 #define SECWDOG_CLKS_SHIFT 20 17 #define SECWDOG_COUNT_SHIFT 0 18 19 static void bcm281xx_restart(enum reboot_mode mode, const char *cmd) 20 { 21 uint32_t val; 22 void __iomem *base; 23 struct device_node *np_wdog; 24 25 np_wdog = of_find_compatible_node(NULL, NULL, "brcm,kona-wdt"); 26 if (!np_wdog) { 27 pr_emerg("Couldn't find brcm,kona-wdt\n"); 28 return; 29 } 30 base = of_iomap(np_wdog, 0); 31 of_node_put(np_wdog); 32 if (!base) { 33 pr_emerg("Couldn't map brcm,kona-wdt\n"); 34 return; 35 } 36 37 /* Enable watchdog with short timeout (244us). */ 38 val = readl(base + SECWDOG_OFFSET); 39 val &= SECWDOG_RESERVED_MASK | SECWDOG_WD_LOAD_FLAG_MASK; 40 val |= SECWDOG_EN_MASK | SECWDOG_SRSTEN_MASK | 41 (0x15 << SECWDOG_CLKS_SHIFT) | 42 (0x8 << SECWDOG_COUNT_SHIFT); 43 writel(val, base + SECWDOG_OFFSET); 44 45 /* Wait for reset */ 46 while (1); 47 } 48 49 static void __init bcm281xx_init(void) 50 { 51 kona_l2_cache_init(); 52 } 53 54 static const char * const bcm281xx_dt_compat[] = { 55 "brcm,bcm11351", /* Have to use the first number upstreamed */ 56 NULL, 57 }; 58 59 DT_MACHINE_START(BCM281XX_DT, "BCM281xx Broadcom Application Processor") 60 .init_machine = bcm281xx_init, 61 .restart = bcm281xx_restart, 62 .dt_compat = bcm281xx_dt_compat, 63 MACHINE_END 64