include/hw/watchdog/wdt_imx2.h

   1 /*
   2  * Copyright (c) 2017, Impinj, Inc.
   3  *
   4  * i.MX2 Watchdog IP block
   5  *
   6  * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
   7  *
   8  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   9  * See the COPYING file in the top-level directory.
  10  */
  11
  12 #ifndef IMX2_WDT_H
  13 #define IMX2_WDT_H
  14
  15 #include "qemu/bitops.h"
  16 #include "hw/sysbus.h"
  17 #include "hw/irq.h"
  18 #include "hw/ptimer.h"
  19 #include "qom/object.h"
  20
  21 #define TYPE_IMX2_WDT "imx2.wdt"
  22 OBJECT_DECLARE_SIMPLE_TYPE(IMX2WdtState, IMX2_WDT)
  23
  24 enum IMX2WdtRegisters {
  25     IMX2_WDT_WCR  = 0x0000, /* Control Register */
  26     IMX2_WDT_WSR  = 0x0002, /* Service Register */
  27     IMX2_WDT_WRSR = 0x0004, /* Reset Status Register */
  28     IMX2_WDT_WICR = 0x0006, /* Interrupt Control Register */
  29     IMX2_WDT_WMCR = 0x0008, /* Misc Register */
  30 };
  31
  32 #define IMX2_WDT_MMIO_SIZE 0x000a
  33
  34 /* Control Register definitions */
  35 #define IMX2_WDT_WCR_WT         (0xFF << 8) /* Watchdog Timeout Field */
  36 #define IMX2_WDT_WCR_WDW        BIT(7)      /* WDOG Disable for Wait */
  37 #define IMX2_WDT_WCR_WDA        BIT(5)      /* WDOG Assertion */
  38 #define IMX2_WDT_WCR_SRS        BIT(4)      /* Software Reset Signal */
  39 #define IMX2_WDT_WCR_WDT        BIT(3)      /* WDOG Timeout Assertion */
  40 #define IMX2_WDT_WCR_WDE        BIT(2)      /* Watchdog Enable */
  41 #define IMX2_WDT_WCR_WDBG       BIT(1)      /* Watchdog Debug Enable */
  42 #define IMX2_WDT_WCR_WDZST      BIT(0)      /* Watchdog Timer Suspend */
  43
  44 #define IMX2_WDT_WCR_LOCK_MASK  (IMX2_WDT_WCR_WDZST | IMX2_WDT_WCR_WDBG \
  45                                  | IMX2_WDT_WCR_WDW)
  46
  47 /* Service Register definitions */
  48 #define IMX2_WDT_SEQ1           0x5555      /* service sequence 1 */
  49 #define IMX2_WDT_SEQ2           0xAAAA      /* service sequence 2 */
  50
  51 /* Reset Status Register definitions */
  52 #define IMX2_WDT_WRSR_TOUT      BIT(1)      /* Reset due to Timeout */
  53 #define IMX2_WDT_WRSR_SFTW      BIT(0)      /* Reset due to software reset */
  54
  55 /* Interrupt Control Register definitions */
  56 #define IMX2_WDT_WICR_WIE       BIT(15)     /* Interrupt Enable */
  57 #define IMX2_WDT_WICR_WTIS      BIT(14)     /* Interrupt Status */
  58 #define IMX2_WDT_WICR_WICT      0xff        /* Interrupt Timeout */
  59 #define IMX2_WDT_WICR_WICT_DEF  0x04        /* Default interrupt timeout (2s) */
  60
  61 #define IMX2_WDT_WICR_LOCK_MASK (IMX2_WDT_WICR_WIE | IMX2_WDT_WICR_WICT)
  62
  63 /* Misc Control Register definitions */
  64 #define IMX2_WDT_WMCR_PDE       BIT(0)      /* Power-Down Enable */
  65
  66 struct IMX2WdtState {
  67     /* <private> */
  68     SysBusDevice parent_obj;
  69
  70     /*< public >*/
  71     MemoryRegion mmio;
  72     qemu_irq irq;
  73
  74     struct ptimer_state *timer;
  75     struct ptimer_state *itimer;
  76
  77     bool pretimeout_support;
  78     bool wicr_locked;
  79
  80     uint16_t wcr;
  81     uint16_t wsr;
  82     uint16_t wrsr;
  83     uint16_t wicr;
  84     uint16_t wmcr;
  85
  86     bool wcr_locked;            /* affects WDZST, WDBG, and WDW */
  87     bool wcr_wde_locked;        /* affects WDE */
  88     bool wcr_wdt_locked;        /* affects WDT (never cleared) */
  89 };
  90
  91 #endif /* IMX2_WDT_H */