hal_platform_setup.h

来自「eCos操作系统源码」· C头文件 代码 · 共 325 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.
//
// This exception does not invalidate any other reasons why a work based on
// 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:         2000-05-08
// Purpose:      Intel SA1110/Assabet platform specific support routines
// Description: 
// Usage:        #include <cyg/hal/hal_platform_setup.h>
//     Only used by "vectors.S"         
//
//####DESCRIPTIONEND####
//
//===========================================================================*/

#include <pkgconf/system.h>             // System-wide configuration info
#include CYGBLD_HAL_VARIANT_H           // Variant (SA11x0) specific configuration
#include CYGBLD_HAL_PLATFORM_H          // Platform specific configuration
#include <cyg/hal/hal_sa11x0.h>         // Variant specific hardware definitions
#include <cyg/hal/hal_mmu.h>            // MMU definitions
#include <cyg/hal/cerfpda.h>            // Platform specific hardware 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


#define CAS0_WAVEFORM_VALUE	0xAAAAAA9F
#define CAS1_WAVEFORM_VALUE	0xAAAAAAAA
#define CAS2_WAVEFORM_VALUE	0xAAAAAAAA

#define MSC0VALUE           0xFFFCFFF8
#define MSC1VALUE           0xFFFFFFFF
#define MSC2VALUE           0xFFFFFFFF

#define DRAM_CONFIG_VALUE   0x72647264
#define RFSH_CONFIG_VALUE   0x00300161

// Macros that handle the red debug LED wired to GPIO-1

        .macro    _LED_ON,led
        ldr     r1,=SA11X0_GPIO_PIN_OUTPUT_SET
        mov     r0,#(1<<\led)
        str     r0,[r1]
        // Delay	
        ldr     r1,=10000
10:     sub     r1,r1,#1
        cmp     r1,#0
        bne     10b 
        .endm
        
        .macro    _LED_OFF,led
        ldr     r1,=SA11X0_GPIO_PIN_OUTPUT_CLEAR
        mov     r0,#(1<<\led)
        str     r0,[r1]
        // Delay	
        ldr     r1,=10000
10:     sub     r1,r1,#1
        cmp     r1,#0
        bne     10b 
        .endm

// This macro represents the initial startup code for the platform        
        .macro  _platform_setup1
	
        // Disable all interrupts (ICMR not specified on power-up)
        ldr     r1,=SA11X0_ICMR
        mov     r0,#0
        str     r0,[r1]
	
        // Initialize the CPU.
        mov     r0, #0x0 		//  Get a zero to turn things off
        mcr     p15, 0, r0, c1, c0, 0 	//  MMU off
        mcr     p15, 0, r0, c8, c7, 0 	//  Flush TLB
        mcr     p15, 0, r0, c7, c7, 0 	//  Flush caches
        nop
        nop
        nop
        nop
        
        // Disable IRQs and FIQs
        mov     r0, #(CPSR_IRQ_DISABLE | \
                      CPSR_FIQ_DISABLE | \
                      CPSR_SUPERVISOR_MODE)
        msr     cpsr, r0

	    // Set up GPIOs (LED1 off)
        ldr     r1,=SA11X0_GPIO_PIN_DIRECTION
        ldr     r2,=0x0320000f          // Set LT1348,DREN,RXEN,CF and LEDs to be output
        str     r2,[r1]
        ldr     r3,=SA11X0_GPIO_PIN_OUTPUT_SET
        ldr     r2,=0x0300000f          // Set the LT1348,DREN,RXEN and LEDs to 1.
        str     r2,[r3] 
        ldr     r3,=SA11X0_GPIO_PIN_OUTPUT_CLEAR
        ldr     r2,=0x0020000f          // Set CF reset,LEDS OFF
        str     r2,[r3] 

        // Turn on LED 0
        _LED_ON 0
	
        // Disable clock switching
        mcr     p15,0,r0,\
                SA11X0_TEST_CLOCK_AND_IDLE_REGISTER,\
                SA11X0_DISABLE_CLOCK_SWITCHING_RM,\
                SA11X0_DISABLE_CLOCK_SWITCHING_OPCODE

        // Set up processor clock
        ldr     r1,=SA11X0_PWR_MGR_PLL_CONFIG
        ldr     r2,=SA11X0_PLL_CLOCK
        str     r2,[r1]

        // Turn clock switching back on
        mcr     p15,0,r0,\
                SA11X0_TEST_CLOCK_AND_IDLE_REGISTER,\
                SA11X0_ENABLE_CLOCK_SWITCHING_RM,\
                SA11X0_ENABLE_CLOCK_SWITCHING_OPCODE
        nop
        nop

        // Let the PLL settle down	
        ldr     r1,=20000
10:     sub     r1,r1,#1
        cmp     r1,#0
        bne     10b 

        // Turn on LED 1
        _LED_ON 1
	
        // Initialize DRAM controller
        ldr     r1,=dram_table
        ldr     r2,=__exception_handlers
        sub     r1,r1,r2
        ldr     r2,[r1],#4                      // First control register
10:     ldr     r3,[r1],#4
        str     r3,[r2]
        ldr     r2,[r1],#4                      // Next control register
        cmp     r2,#0
        bne     10b

        // Turn on LED 2
        _LED_ON 2

        // Enable UART
        ldr     r1,=SA1110_GPCLK_CONTROL_0
        ldr     r2,=SA1110_GPCLK_SUS_UART
        str     r2,[r1]

        // Release DRAM hold (set by RESET)
        ldr     r1,=SA11X0_PWR_MGR_SLEEP_STATUS
        ldr     r2,=SA11X0_DRAM_CONTROL_HOLD
        str     r2,[r1]
	
        // Perform 8 reads from unmapped/unenabled DRAM
        ldr     r1,=SA11X0_RAM_BANK0_BASE
	    ldr     r2,[r1]
        ldr     r2,[r1]
        ldr     r2,[r1]
        ldr     r2,[r1]
        ldr     r2,[r1]
        ldr     r2,[r1]
        ldr     r2,[r1]
        ldr     r2,[r1]

	    // Enable DRAM bank 0
        ldr     r1,=SA11X0_DRAM_CONFIGURATION
        ldr     r2,=DRAM_CONFIG_VALUE
	    ldr     r3,=0x00030003
        orr     r2, r2, r3
        str     r2,[r1]
	
	    // Wait for the DRAM to come up.
        mov     r1, #0x400
0:	    subs    r1, r1, #1
        bne     0b

        // Turn on LED 3
        _LED_ON 3

        b       19f
        
// DRAM controller initialization        
dram_table:
        .word   SA11X0_DRAM0_CAS_0,           CAS0_WAVEFORM_VALUE
        .word   SA11X0_DRAM0_CAS_1,           CAS1_WAVEFORM_VALUE
        .word   SA11X0_DRAM0_CAS_2,           CAS2_WAVEFORM_VALUE
        .word   SA11X0_DRAM2_CAS_0,           CAS0_WAVEFORM_VALUE
        .word   SA11X0_DRAM2_CAS_1,           CAS1_WAVEFORM_VALUE
        .word   SA11X0_DRAM2_CAS_2,           CAS2_WAVEFORM_VALUE
        .word   SA11X0_REFRESH_CONFIGURATION, RFSH_CONFIG_VALUE
        .word   SA11X0_DRAM_CONFIGURATION,    DRAM_CONFIG_VALUE 
        .word   SA11X0_STATIC_CONTROL_0,      MSC0VALUE
        .word   SA11X0_STATIC_CONTROL_1,      MSC1VALUE
        .word   SA11X0_STATIC_CONTROL_2,      MSC2VALUE
        .word   0, 0

19:
        // Wakeup from deep sleep mode
        ldr     r1,=SA11X0_RESET_STATUS
        ldr     r2,[r1]
        cmp     r2,#SA11X0_SLEEP_MODE_RESET
        bne     45f
        ldr     r1,=SA11X0_PWR_MGR_SCRATCHPAD
        ldr     r1,[r1]
        mov     pc,r1
        nop
45:     nop

        // Release peripheral hold (set by RESET)
        ldr     r1,=SA11X0_PWR_MGR_SLEEP_STATUS
        ldr     r2,=SA11X0_PERIPHERAL_CONTROL_HOLD
        str     r2,[r1]

        // Set up a stack [for calling C code]
        ldr     r1,=__startup_stack
        ldr     r2,=SA11X0_RAM_BANK0_BASE
        orr     sp,r1,r2

        // Create MMU tables
        bl      hal_mmu_init
       
        // Turn OFF LED 0 
        _LED_OFF 0
	
        // Enable MMU
        ldr     r2,=10f
       	ldr	    r1,=MMU_Control_Init|MMU_Control_M
	    mcr	    MMU_CP,0,r1,MMU_Control,c0
	    mov	    pc,r2    /* Change address spaces */
	    nop
 	    nop
	    nop

10:
        // Turn OFF LED 1 
        _LED_OFF 1

        // Save shadow copy of BCR, also hardware configuration
        ldr     r1,=_cerfpda_BCR
        str     r2,[r1]
        .endm
        
#else // defined(CYG_HAL_STARTUP_ROM)
#define PLATFORM_SETUP1
#endif

#define PLATFORM_VECTORS         _platform_vectors
        .macro  _platform_vectors
        .globl  _cerfpda_BCR
_cerfpda_BCR:   .long   0       // Board Control register shadow
        .endm                                        

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