arch/arm/mach-bcm/board_bcm281xx.c

   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