hal_platform_setup.h

基于ecos的redboot

#ifndef CYGONCE_HAL_PLATFORM_SETUP_H
#define CYGONCE_HAL_PLATFORM_SETUP_H

/*=============================================================================
//
//      hal_platform_setup.h
//
//      Platform specific support for HAL (assembly code)
//
//=============================================================================
//####COPYRIGHTBEGIN####
//                                                                          
// -------------------------------------------                              
// The contents of this file are subject to the Red Hat eCos Public License 
// Version 1.1 (the "License"); you may not use this file except in         
// compliance with the License.  You may obtain a copy of the License at    
// http://www.redhat.com/                                                   
//                                                                          
// Software distributed under the License is distributed on an "AS IS"      
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
// License for the specific language governing rights and limitations under 
// the License.                                                             
//                                                                          
// The Original Code is eCos - Embedded Configurable Operating System,      
// released September 30, 1998.                                             
//                                                                          
// The Initial Developer of the Original Code is Red Hat.                   
// Portions created by Red Hat are                                          
// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
// All Rights Reserved.                                                     
// -------------------------------------------                              
//                                                                          
//####COPYRIGHTEND####
//=============================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    gthomas
// Contributors: gthomas, dmoseley
//               Travis C. Furrer <[e-mail]>
// Date:         2000-05-08
// Purpose:      Intel SA1100 Multimedia platform specific support routines
// Description: 
// Usage:        #include <cyg/hal/hal_platform_setup.h>
//     This file should only be used by "vectors.S"        
//
//####DESCRIPTIONEND####
//
//===========================================================================*/

#include <pkgconf/system.h>             // System-wide configuration info
#include CYGBLD_HAL_PLATFORM_H          // Platform specific configuration
#include <cyg/hal/hal_sa11x0.h>         // Platform specific hardware definitions
#include <cyg/hal/hal_mmu.h>            // MMU definitions

#if defined(CYG_HAL_STARTUP_ROM)
#define PLATFORM_SETUP1 _platform_setup1
#define CYGHWR_HAL_ARM_HAS_MMU

#if (CYGHWR_HAL_ARM_SA11X0_PROCESSOR_CLOCK == 59000)
#define SA11X0_PLL_CLOCK 0x0        
#elif (CYGHWR_HAL_ARM_SA11X0_PROCESSOR_CLOCK == 73700)
#define SA11X0_PLL_CLOCK 0x1
#elif (CYGHWR_HAL_ARM_SA11X0_PROCESSOR_CLOCK == 88500)
#define SA11X0_PLL_CLOCK 0x2        
#elif (CYGHWR_HAL_ARM_SA11X0_PROCESSOR_CLOCK == 103200) 
#define SA11X0_PLL_CLOCK 0x3        
#elif (CYGHWR_HAL_ARM_SA11X0_PROCESSOR_CLOCK == 118000)
#define SA11X0_PLL_CLOCK 0x4        
#elif (CYGHWR_HAL_ARM_SA11X0_PROCESSOR_CLOCK == 132700)
#define SA11X0_PLL_CLOCK 0x5        
#elif (CYGHWR_HAL_ARM_SA11X0_PROCESSOR_CLOCK == 147500)
#define SA11X0_PLL_CLOCK 0x6        
#elif (CYGHWR_HAL_ARM_SA11X0_PROCESSOR_CLOCK == 162200)
#define SA11X0_PLL_CLOCK 0x7        
#elif (CYGHWR_HAL_ARM_SA11X0_PROCESSOR_CLOCK == 176900)
#define SA11X0_PLL_CLOCK 0x8        
#elif (CYGHWR_HAL_ARM_SA11X0_PROCESSOR_CLOCK == 191700)
#define SA11X0_PLL_CLOCK 0x9        
#elif (CYGHWR_HAL_ARM_SA11X0_PROCESSOR_CLOCK == 206400)
#define SA11X0_PLL_CLOCK 0xA        
#elif (CYGHWR_HAL_ARM_SA11X0_PROCESSOR_CLOCK == 221200)
#define SA11X0_PLL_CLOCK 0xB        
#else
#error Invalid processor clock speed
#endif

// This function is called very early on by the boot ROM (or by any ROM
// based startup).  It's job is to initialize the hardware to a known state
// so that eCos applications can execute properly.

// This version of the code is patterned after the contribution from
// Travis Furer (@MIT)                


// Define macro used to diddle the LEDs during early initialization.
// Can use r0+r1.  Argument in \x.

#define CYGHWR_LED_MACRO _set_LEDS \x
        
// Initialize GPIOs
#define GPIO_GRER (SA11X0_GPIO_RISING_EDGE_DETECT-SA11X0_GPIO_PIN_LEVEL)
#define GPIO_GFER (SA11X0_GPIO_FALLING_EDGE_DETECT-SA11X0_GPIO_PIN_LEVEL)
#define GPIO_GAFR (SA11X0_GPIO_ALTERNATE_FUNCTION-SA11X0_GPIO_PIN_LEVEL)
#define GPIO_GEDR (SA11X0_GPIO_EDGE_DETECT_STATUS-SA11X0_GPIO_PIN_LEVEL)
#define GPIO_GPDR (SA11X0_GPIO_PIN_DIRECTION-SA11X0_GPIO_PIN_LEVEL)
#define GPIO_GPCR (SA11X0_GPIO_PIN_OUTPUT_CLEAR-SA11X0_GPIO_PIN_LEVEL)
        .macro  _init_GPIO
        ldr     r1,=SA11X0_GPIO_PIN_LEVEL
        mov     r0,#0           
        str     r0,[r1,#GPIO_GRER]      // Disable rising edge detects
        str     r0,[r1,#GPIO_GFER]      // Disable falling edge detects
        str     r0,[r1,#GPIO_GAFR]      // No alt. funcs. during init
        sub     r0,r0,#1        
        str     r0,[r1,#GPIO_GPCR]      // Force all outputs to low
        str     r0,[r1,#GPIO_GEDR]      // Clear edge detect status
        ldr     r0,=0x00100300  
        str     r0,[r1,#GPIO_GPDR]      // Only LEDs outputs (for now)
        .endm

#define DISCRETE_LED_REG_BASE     0x18800000
#define KEYPAD_IO_O               0x4
#define DISCRETE_LED_O            0x6
#define HEX_LED_REG_BASE          0x18c00000
#define HEX_LED_O                 0x0
#define HEX_DATA_MASK             0x0F
#define HEX_LED_0_STROBE          0x10
#define HEX_LED_1_STROBE          0x20
#define HEX_LED_BOTH_STROBES      (HEX_LED_0_STROBE | HEX_LED_1_STROBE)

// Display value on hex LED display
        .macro  _set_LEDS,val
        ldr     r1, =HEX_LED_REG_BASE

        ldr     r2, =\val
        and     r2, r2, #0xf
        orr	r0, r2, #HEX_LED_0_STROBE
        str     r0, [r1, #HEX_LED_O]

        ldr     r2, =\val
        mov     r2, r2, LSR #4
        orr	r0, r2, #HEX_LED_1_STROBE
        str     r0, [r1, #HEX_LED_O]
        
        nop
        .endm

// Initialize HEX display.
        .macro  _init_HEX_DISPLAY
        ldr     r1, =DISCRETE_LED_REG_BASE
        ldr     r2, =~0
        str     r2, [r1, #KEYPAD_IO_O]
        str     r2, [r1, #DISCRETE_LED_O]
        _set_LEDS 0x23
        .endm

// Setup pin directions:
//  inputs: all serial receive pins
// outputs: all LCD pins, all serial transmit pins
        .macro  _init_PERIPHERAL_PINS
        ldr     r0,=0x00355FFF
        ldr     r1,=SA11X0_PPC_PIN_DIRECTION
        str     r0,[r1]
        mov     r0,#0                           // Force initial state
        ldr     r1,=SA11X0_PPC_PIN_STATE
        str     r0,[r1]
        ldr     r1,=SA11X0_PPC_PIN_ASSIGNMENT   // Disable any reassignments
        str     r0,[r1]
        .endm
        
// Set core frequency (this can take up to 150us)        
        .macro  _set_CLOCK_FREQUENCY
        mov     r0,#SA11X0_PLL_CLOCK
        ldr     r1,=SA11X0_PWR_MGR_PLL_CONFIG
        str     r0,[r1]
        .endm

// Enable clock switching (must be done after setting core frequency)
        .macro  _enable_CLOCK_SWITCHING
        mcr     p15,0,r1,c15,c1,2
        .endm

// Initialize memory interfaces. (ROM, SRAM, Flash, DRAM, etc)
//
// SA1100 Multimedia memory is as follows:
//   ROM     128K (assuming 32 bit accesses)
//   Flash   4M (assuming 32 bit accesses)