1 //==========================================================================
3 // devs/watchdog/powerpc/mpc5xx/watchdog_mpc5xx.cxx
5 // Watchdog implementation for MPC5XX
7 //==========================================================================
8 //####ECOSGPLCOPYRIGHTBEGIN####
9 // -------------------------------------------
10 // This file is part of eCos, the Embedded Configurable Operating System.
11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
13 // eCos is free software; you can redistribute it and/or modify it under
14 // the terms of the GNU General Public License as published by the Free
15 // Software Foundation; either version 2 or (at your option) any later version.
17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
22 // You should have received a copy of the GNU General Public License along
23 // with eCos; if not, write to the Free Software Foundation, Inc.,
24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
26 // As a special exception, if other files instantiate templates or use macros
27 // or inline functions from this file, or you compile this file and link it
28 // with other works to produce a work based on this file, this file does not
29 // by itself cause the resulting work to be covered by the GNU General Public
30 // License. However the source code for this file must still be made available
31 // in accordance with section (3) of the GNU General Public License.
33 // This exception does not invalidate any other reasons why a work based on
34 // this file might be covered by the GNU General Public License.
36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
37 // at http://sources.redhat.com/ecos/ecos-license/
38 // -------------------------------------------
39 //####ECOSGPLCOPYRIGHTEND####
40 //==========================================================================
41 //#####DESCRIPTIONBEGIN####
43 // Author(s): Bob Koninckx
44 // Contributors: Bob Koninckx
46 // Purpose: Watchdog class implementation
47 // Description: Contains an implementation of the Watchdog class for use
48 // with the mpc5xx watchdog timer.
50 //####DESCRIPTIONEND####
52 //==========================================================================
54 #include <pkgconf/system.h> // system configuration file
55 #include <pkgconf/watchdog.h> // configuration for this package
57 #include <cyg/infra/cyg_trac.h> // tracing macros
59 #include <cyg/hal/hal_io.h> // IO register access
60 #include <cyg/hal/hal_arch.h> // Register definitions
62 #include <cyg/io/watchdog.hxx> // watchdog API
64 // -------------------------------------------------------------------------
65 // MPC5xx SYPCR register bit definitions
66 #define MPC5XX_SYPCR_SWTC 0xffff0000
67 #define MPC5XX_SYPCR_SWP 0x00000001
68 #define MPC5XX_SYPCR_SWRI 0x00000002
69 #define MPC5XX_SYPCR_SWE 0x00000004
70 #define MPC5XX_SYPCR_SWF 0x00000008
72 // -------------------------------------------------------------------------
76 Cyg_Watchdog::init_hw(void)
78 CYG_REPORT_FUNCTION();
81 HAL_READ_UINT32(CYGARC_REG_IMM_SYPCR, sypcr);
83 resolution = (sypcr & MPC5XX_SYPCR_SWTC) >> 16;
84 if(sypcr & MPC5XX_SYPCR_SWP)
87 // Now we have it in ticks, convert to nanoseconds
88 // This holds for a system clock of 40 Mhz (25 nanosecond ticks) which is normal
95 // -------------------------------------------------------------------------
96 // Start the watchdog running.
97 // On powerpc, the watchdog is enabled by default. If the watchdog package
98 // is present, board setup does not disable it, so, nothing special to be
101 Cyg_Watchdog::start(void)
103 CYG_REPORT_FUNCTION();
108 // -------------------------------------------------------------------------
109 // Reset watchdog timer. This needs to be called regularly to prevent
110 // the watchdog firing.
113 Cyg_Watchdog::reset()
115 CYG_REPORT_FUNCTION();
119 HAL_WRITE_UINT16(CYGARC_REG_IMM_SWSR, swsr);
121 HAL_WRITE_UINT16(CYGARC_REG_IMM_SWSR, swsr);
126 // -------------------------------------------------------------------------
127 // EOF watchdog_mpc5xx.cxx