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//==========================================================================
//
//      gps4020.h
//
//      GPS-4020 Platform specific registers, etc
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####                                            
// -------------------------------------------                              
// This file is part of eCos, the Embedded Configurable Operating System.   
// Copyright (C) 2003 Free Software Foundation, Inc.                        
//
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// version.                                                                 
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// for more details.                                                        
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//
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// General Public License v2.                                               
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// on this file might be covered by the GNU General Public License.         
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// ####ECOSGPLCOPYRIGHTEND####                                              
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    gthomas
// Contributors: gthomas
// Date:         2003-10-01
// Purpose:      Platform specific registers, etc
// Description:  
//
//####DESCRIPTIONEND####
//
//========================================================================*/
 
#ifndef _GPS4020_H_
#define _GPS4020_H_
 
#define GPS4020_WATCHDOG 0xE0004000
#define GPS4020_INTC     0xE0006000
#define GPS4020_TC1      0xE000E000
#define GPS4020_TC2      0xE000F000
#define GPS4020_UART1    0xE0018000
#define GPS4020_UART2    0xE0019000
 
#ifndef __ASSEMBLER__
struct _gps4020_watchdog {
    unsigned long control;
    unsigned long period;
    unsigned long current;  // Only accessible in TEST mode
    unsigned long reset;
};
#endif
#define GPS4020_WATCHDOG_RESET 0xECD9F7BD
 
#ifndef __ASSEMBLER__
struct _gps4020_uart {
    unsigned char control;
    unsigned char _fill0[3];
    unsigned char mode;
    unsigned char _fill1[3];
    unsigned char baud;
    unsigned char _fill2[3];
    unsigned char status;
    unsigned char _fill3[3];
    unsigned char TxRx;
    unsigned char _fill4[3];
    unsigned char modem_control;
    unsigned char _fill5[3+8];
    unsigned char modem_status;
    unsigned char _fill6[3];
};
#endif
 
// Serial control
#define SCR_MIE      0x80   // Modem interrupt enable
#define SCR_EIE      0x40   // Error interrupt enable
#define SCR_TIE      0x20   // Transmit interrupt enable
#define SCR_RIE      0x10   // Receive interrupt enable
#define SCR_FCT      0x08   // Flow type 0=>software, 1=>hardware
#define SCR_CLK      0x04   // Clock source 0=internal, 1=external
#define SCR_TEN      0x02   // Transmitter enabled
#define SCR_REN      0x01   // Receiver enabled
// Serial mode
#define SMR_DIV(x)   ((x)<<4) // Clock divisor
#define SMR_STOP     0x08   // Stop bits 0=>one, 1=>two
#define   SMR_STOP_1   0x00
#define   SMR_STOP_2   0x08
#define SMR_PARITY   0x04   // Parity mode 0=>even, 1=odd
#define   SMR_PARITY_EVEN 0x00
#define   SMR_PARITY_ODD  0x04
#define SMR_PARITY_ON 0x02  // Parity checked
#define   SMR_PARITY_OFF  0x00
#define SMR_LENGTH    0x01  // Character length
#define    SMR_LENGTH_8 0x00
#define    SMR_LENGTH_7 0x01
// Serial status
#define SSR_MSS      0x80   // Modem status has changed
#define SSR_OE       0x40   // Overrun error
#define SSR_FE       0x20   // Framing error
#define SSR_PE       0x10   // Parity error
#define SSR_TxActive 0x08   // Transmitter is active
#define SSR_RxActive 0x04   // Receiver is active
#define SSR_TxEmpty  0x02   // Tx buffer is empty
#define SSR_RxFull   0x01   // Rx buffer contains data
// Modem control
#define SMR_CFG      0x08   // Configuration 0=>normal, 1=>null
#define SMR_MSU      0x04   // Modem status update 1=>enable
#define SMR_DTR      0x02   // Assert DTR
#define SMR_RTS      0x01   // Assert RTS
 
#ifndef __ASSEMBLER__
struct _gps4020_timer {
    struct {
        unsigned long control;
        unsigned long reload;
        unsigned long current;
        unsigned long _reserved[5];
    } tc[2];
};
#endif
 
// Timer/counter control
#define TC_CTL_IE    (1<<22)  // Interrupt enable
#define TC_CTL_OS    (1<<21)  // Overflow (count through 0)
#define TC_CTL_MODE  (3<<19)  // Timer/counter mode
#define   TC_CTL_MODE_HALT   (0<<19)
#define   TC_CTL_MODE_FREE   (1<<19)
#define   TC_CTL_MODE_RELOAD (2<<19)
#define   TC_CTL_MODE_PWM    (3<<19)
#define TC_CTL_SCR   (1<<18)  // Software control request
#define   TC_CTL_SCR_HALT    (0<<18)
#define   TC_CTL_SCR_COUNT   (1<<18)
#define TC_CTL_HEP   (1<<17)  // Hardware enable polarity
#define TC_CTL_STAT  (1<<16)  // Current status
 
#define TC_CLOCK_BASE 20      // Assumes 20MHz system clock
 
#ifndef __ASSEMBLER__
struct _gps4020_intc {
    unsigned long sources;    // Active interrupt sources
    unsigned long polarity;   // 0=>active low
    unsigned long active;
    unsigned long trigger;    // 0=>level, 1=>edge
    unsigned long reset;      // reset edge triggers
    unsigned long enable;     // 1=>enable
    unsigned long status;     // masked (active and enabled)
    unsigned long type;       // 0=>IRQ, 1=>FIQ
    unsigned long FIQ_status;
    unsigned long IRQ_status;
    unsigned long FIQ_encoded;
    unsigned long IRQ_encoded;
};
#endif
 
#ifndef __ASSEMBLER__
externC void _gps4020_watchdog(bool is_idle);
#endif
#endif  // _GPS4020_H_