1 /* 2 * Copyright (C) 2012-2014 Broadcom Corporation 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License as 6 * published by the Free Software Foundation version 2. 7 * 8 * This program is distributed "as is" WITHOUT ANY WARRANTY of any 9 * kind, whether express or implied; without even the implied warranty 10 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14 #include <linux/clocksource.h> 15 #include <linux/of_address.h> 16 #include <linux/of_platform.h> 17 18 #include <asm/mach/arch.h> 19 20 #include "kona_l2_cache.h" 21 22 #define SECWDOG_OFFSET 0x00000000 23 #define SECWDOG_RESERVED_MASK 0xe2000000 24 #define SECWDOG_WD_LOAD_FLAG_MASK 0x10000000 25 #define SECWDOG_EN_MASK 0x08000000 26 #define SECWDOG_SRSTEN_MASK 0x04000000 27 #define SECWDOG_CLKS_SHIFT 20 28 #define SECWDOG_COUNT_SHIFT 0 29 30 static void bcm281xx_restart(enum reboot_mode mode, const char *cmd) 31 { 32 uint32_t val; 33 void __iomem *base; 34 struct device_node *np_wdog; 35 36 np_wdog = of_find_compatible_node(NULL, NULL, "brcm,kona-wdt"); 37 if (!np_wdog) { 38 pr_emerg("Couldn't find brcm,kona-wdt\n"); 39 return; 40 } 41 base = of_iomap(np_wdog, 0); 42 if (!base) { 43 pr_emerg("Couldn't map brcm,kona-wdt\n"); 44 return; 45 } 46 47 /* Enable watchdog with short timeout (244us). */ 48 val = readl(base + SECWDOG_OFFSET); 49 val &= SECWDOG_RESERVED_MASK | SECWDOG_WD_LOAD_FLAG_MASK; 50 val |= SECWDOG_EN_MASK | SECWDOG_SRSTEN_MASK | 51 (0x15 << SECWDOG_CLKS_SHIFT) | 52 (0x8 << SECWDOG_COUNT_SHIFT); 53 writel(val, base + SECWDOG_OFFSET); 54 55 /* Wait for reset */ 56 while (1); 57 } 58 59 static void __init bcm281xx_init(void) 60 { 61 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 62 kona_l2_cache_init(); 63 } 64 65 static const char * const bcm281xx_dt_compat[] = { 66 "brcm,bcm11351", /* Have to use the first number upstreamed */ 67 NULL, 68 }; 69 70 DT_MACHINE_START(BCM281XX_DT, "BCM281xx Broadcom Application Processor") 71 .init_machine = bcm281xx_init, 72 .restart = bcm281xx_restart, 73 .dt_compat = bcm281xx_dt_compat, 74 MACHINE_END 75