1959faee9SChristian Daudt /* 2a21ea269SMarkus Mayer * Copyright (C) 2012-2014 Broadcom Corporation 3959faee9SChristian Daudt * 4959faee9SChristian Daudt * This program is free software; you can redistribute it and/or 5959faee9SChristian Daudt * modify it under the terms of the GNU General Public License as 6959faee9SChristian Daudt * published by the Free Software Foundation version 2. 7959faee9SChristian Daudt * 8959faee9SChristian Daudt * This program is distributed "as is" WITHOUT ANY WARRANTY of any 9959faee9SChristian Daudt * kind, whether express or implied; without even the implied warranty 10959faee9SChristian Daudt * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11959faee9SChristian Daudt * GNU General Public License for more details. 12959faee9SChristian Daudt */ 13959faee9SChristian Daudt 14959faee9SChristian Daudt #include <linux/clocksource.h> 15389df036SMarkus Mayer #include <linux/of_address.h> 16389df036SMarkus Mayer #include <linux/of_platform.h> 17959faee9SChristian Daudt 18959faee9SChristian Daudt #include <asm/mach/arch.h> 19959faee9SChristian Daudt 20959faee9SChristian Daudt #include "kona.h" 21959faee9SChristian Daudt 22a21ea269SMarkus Mayer #define SECWDOG_OFFSET 0x00000000 23a21ea269SMarkus Mayer #define SECWDOG_RESERVED_MASK 0xe2000000 24a21ea269SMarkus Mayer #define SECWDOG_WD_LOAD_FLAG_MASK 0x10000000 25a21ea269SMarkus Mayer #define SECWDOG_EN_MASK 0x08000000 26a21ea269SMarkus Mayer #define SECWDOG_SRSTEN_MASK 0x04000000 27a21ea269SMarkus Mayer #define SECWDOG_CLKS_SHIFT 20 28a21ea269SMarkus Mayer #define SECWDOG_COUNT_SHIFT 0 29959faee9SChristian Daudt 30a21ea269SMarkus Mayer static void bcm281xx_restart(enum reboot_mode mode, const char *cmd) 31a21ea269SMarkus Mayer { 32a21ea269SMarkus Mayer uint32_t val; 33a21ea269SMarkus Mayer void __iomem *base; 34a21ea269SMarkus Mayer struct device_node *np_wdog; 35a21ea269SMarkus Mayer 36a21ea269SMarkus Mayer np_wdog = of_find_compatible_node(NULL, NULL, "brcm,kona-wdt"); 37a21ea269SMarkus Mayer if (!np_wdog) { 38a21ea269SMarkus Mayer pr_emerg("Couldn't find brcm,kona-wdt\n"); 39a21ea269SMarkus Mayer return; 40959faee9SChristian Daudt } 41a21ea269SMarkus Mayer base = of_iomap(np_wdog, 0); 42a21ea269SMarkus Mayer if (!base) { 43a21ea269SMarkus Mayer pr_emerg("Couldn't map brcm,kona-wdt\n"); 44a21ea269SMarkus Mayer return; 45a21ea269SMarkus Mayer } 46a21ea269SMarkus Mayer 47a21ea269SMarkus Mayer /* Enable watchdog with short timeout (244us). */ 48a21ea269SMarkus Mayer val = readl(base + SECWDOG_OFFSET); 49a21ea269SMarkus Mayer val &= SECWDOG_RESERVED_MASK | SECWDOG_WD_LOAD_FLAG_MASK; 50a21ea269SMarkus Mayer val |= SECWDOG_EN_MASK | SECWDOG_SRSTEN_MASK | 51a21ea269SMarkus Mayer (0x15 << SECWDOG_CLKS_SHIFT) | 52a21ea269SMarkus Mayer (0x8 << SECWDOG_COUNT_SHIFT); 53a21ea269SMarkus Mayer writel(val, base + SECWDOG_OFFSET); 54a21ea269SMarkus Mayer 55a21ea269SMarkus Mayer /* Wait for reset */ 56a21ea269SMarkus Mayer while (1); 57959faee9SChristian Daudt } 58959faee9SChristian Daudt 59*0e8b860aSMarkus Mayer static void __init bcm281xx_init(void) 60959faee9SChristian Daudt { 61959faee9SChristian Daudt of_platform_populate(NULL, of_default_bus_match_table, NULL, 62959faee9SChristian Daudt &platform_bus); 63959faee9SChristian Daudt kona_l2_cache_init(); 64959faee9SChristian Daudt } 65959faee9SChristian Daudt 669c6423aaSAlex Elder static const char * const bcm281xx_dt_compat[] = { 679c6423aaSAlex Elder "brcm,bcm11351", /* Have to use the first number upstreamed */ 689c6423aaSAlex Elder NULL, 699c6423aaSAlex Elder }; 70959faee9SChristian Daudt 719c6423aaSAlex Elder DT_MACHINE_START(BCM281XX_DT, "BCM281xx Broadcom Application Processor") 72*0e8b860aSMarkus Mayer .init_machine = bcm281xx_init, 73a21ea269SMarkus Mayer .restart = bcm281xx_restart, 749c6423aaSAlex Elder .dt_compat = bcm281xx_dt_compat, 75959faee9SChristian Daudt MACHINE_END 76