hal_platform_setup.h

来自「eCos操作系统源码」· C头文件 代码 · 共 123 行

#ifndef CYGONCE_HAL_PLATFORM_SETUP_H
#define CYGONCE_HAL_PLATFORM_SETUP_H

/*=============================================================================
//
//      hal_platform_setup.h
//
//      Platform specific support for HAL (assembly code)
//
//=============================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
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// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//=============================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):   gthomas
// Contributors:gthomas
// Date:        2001-07-12
// Purpose:     AT91/EB40 platform specific support routines
// Description: 
// Usage:       #include <cyg/hal/hal_platform_setup.h>
//
//####DESCRIPTIONEND####
//
//===========================================================================*/

#include <cyg/hal/var_io.h>

#if defined(CYG_HAL_STARTUP_ROM) || defined(CYG_HAL_STARTUP_ROMRAM)

        .macro  _setup
        ldr     r10,=_InitMemory        // Initialize memory controller
        movs    r0,pc,lsr #20           // If ROM startup, PC < 0x100000
        moveq   r10,r10,lsl #12         //   mask address to low 20 bits
        moveq   r10,r10,lsr #12
        ldmia   r10!,{r0-r9,r11-r12}    // Table of initialization constants
#if defined(CYG_HAL_STARTUP_ROMRAM)
        ldr     r10,=0x0000FFFF
        and     r12,r12,r10
        ldr     r10,=0x01010000
        orr     r12,r12,r10
#endif        
        stmia   r11!,{r0-r9}            // Write to controller
        mov     pc,r12                  // Change address space, break pipeline
_InitMemory:            
        .long   0x01002535  // 0x01000000, 16MB,  2 cycles after transfer, 16-bit, 6 wait states
        .long   0x02002121  // 0x02000000, 16MB,  0 cycles after transfer, 16-bit, 1 wait state
        .long   0x20000000  // unused
        .long   0x30000000  // unused
        .long   0x40000000  // unused
        .long   0x50000000  // unused
        .long   0x60000000  // unused
        .long   0x70000000  // unused
        .long   0x00000001  // REMAP command
        .long   0x00000006  // 7 memory regions, standard read
        .long   AT91_EBI    // External Bus Interface address
        .long   10f         // address where to jump
10:
        
#if defined(CYG_HAL_STARTUP_ROMRAM)
        ldr     r0,=0x01010000          // Relocate FLASH/ROM to on-chip RAM
        ldr     r1,=0x02000000          // RAM base & length
        ldr     r2,=0x02010000
20:     ldr     r3,[r0],#4
        str     r3,[r1],#4
        cmp     r1,r2
        bne     20b
        ldr     r0,=30f
        mov     pc,r0
30:             
#endif
                
        ldr     r0,=AT91_PS             // Power saving interface
        ldr     r1,=0xFFFFFFFF          // Enable all peripheral [clocks]
        str     r1,[r0,#AT91_PS_PCER]
        ldr     r0,=AT91_PIO            // Disable PIO (so peripherals can use bits)
        ldr     r1,=0x0070FE49          // UART, FIQ, EINT, Timer clocks
        str     r1,[r0,#AT91_PIO_PDR]
        ldr     r1,=0x000001B6          // LEDs
        str     r1,[r0,#AT91_PIO_OER]
        str     r1,[r0,#AT91_PIO_SODR]
        .endm        

#define CYGSEM_HAL_ROM_RESET_USES_JUMP
#define PLATFORM_SETUP1     _setup
#else
#define PLATFORM_SETUP1
#endif

//-----------------------------------------------------------------------------
// end of hal_platform_setup.h
#endif // CYGONCE_HAL_PLATFORM_SETUP_H