smdk2410_misc.c

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//==========================================================================
//
//      smdk2410_misc.c
//
//      HAL misc board support code for ARM9/SMDK2410
//
//==========================================================================
//####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.
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// 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
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// this file might be covered by the GNU General Public License.
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
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//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    michael anburaj <[e-mail]>
// Contributors: michael anburaj <[e-mail]>
// Date:         2003-08-01
// Purpose:      HAL board support
// Description:  Implementations of HAL board interfaces
//
//####DESCRIPTIONEND####
//
//==========================================================================

#include <pkgconf/hal.h>
#include <pkgconf/system.h>
#include CYGBLD_HAL_PLATFORM_H

#include <cyg/infra/cyg_type.h>         // base types
#include <cyg/infra/cyg_trac.h>         // tracing macros
#include <cyg/infra/cyg_ass.h>          // assertion macros

#include <cyg/hal/hal_io.h>             // IO macros
#include <cyg/hal/hal_arch.h>           // Register state info
#include <cyg/hal/hal_diag.h>
#include <cyg/hal/hal_intr.h>           // Interrupt names
#include <cyg/hal/hal_cache.h>
#include <cyg/hal/s3c2410x.h>           // Platform specifics

#include <cyg/infra/diag.h>             // diag_printf

#include <string.h>                     // memset

// -------------------------------------------------------------------------
// MMU initialization:
// 
// These structures are laid down in memory to define the translation
// table.
// 

// ARM Translation Table Base Bit Masks
#define ARM_TRANSLATION_TABLE_MASK               0xFFFFC000

// ARM Domain Access Control Bit Masks
#define ARM_ACCESS_TYPE_NO_ACCESS(domain_num)    (0x0 << (domain_num)*2)
#define ARM_ACCESS_TYPE_CLIENT(domain_num)       (0x1 << (domain_num)*2)
#define ARM_ACCESS_TYPE_MANAGER(domain_num)      (0x3 << (domain_num)*2)

struct ARM_MMU_FIRST_LEVEL_FAULT {
    int id : 2;
    int sbz : 30;
};
#define ARM_MMU_FIRST_LEVEL_FAULT_ID 0x0

struct ARM_MMU_FIRST_LEVEL_PAGE_TABLE {
    int id : 2;
    int imp : 2;
    int domain : 4;
    int sbz : 1;
    int base_address : 23;
};
#define ARM_MMU_FIRST_LEVEL_PAGE_TABLE_ID 0x1

struct ARM_MMU_FIRST_LEVEL_SECTION {
    int id : 2;
    int b : 1;
    int c : 1;
    int imp : 1;
    int domain : 4;
    int sbz0 : 1;
    int ap : 2;
    int sbz1 : 8;
    int base_address : 12;
};
#define ARM_MMU_FIRST_LEVEL_SECTION_ID 0x2

struct ARM_MMU_FIRST_LEVEL_RESERVED {
    int id : 2;
    int sbz : 30;
};
#define ARM_MMU_FIRST_LEVEL_RESERVED_ID 0x3

#define ARM_MMU_FIRST_LEVEL_DESCRIPTOR_ADDRESS(ttb_base, table_index) \
   (unsigned long *)((unsigned long)(ttb_base) + ((table_index) << 2))

#define ARM_FIRST_LEVEL_PAGE_TABLE_SIZE 0x4000

#define ARM_MMU_SECTION(ttb_base, actual_base, virtual_base,              \
                        cacheable, bufferable, perm)                      \
    CYG_MACRO_START                                                       \
        register union ARM_MMU_FIRST_LEVEL_DESCRIPTOR desc;               \
                                                                          \
        desc.word = 0;                                                    \
        desc.section.id = ARM_MMU_FIRST_LEVEL_SECTION_ID;                 \
        desc.section.imp = 1;                                             \
        desc.section.domain = 0;                                          \
        desc.section.c = (cacheable);                                     \
        desc.section.b = (bufferable);                                    \
        desc.section.ap = (perm);                                         \
        desc.section.base_address = (actual_base);                        \
        *ARM_MMU_FIRST_LEVEL_DESCRIPTOR_ADDRESS(ttb_base, (virtual_base)) \
                            = desc.word;                                  \
    CYG_MACRO_END

#define X_ARM_MMU_SECTION(abase,vbase,size,cache,buff,access)      \
    { int i; int j = abase; int k = vbase;                         \
      for (i = size; i > 0 ; i--,j++,k++)                          \
      {                                                            \
        ARM_MMU_SECTION(ttb_base, j, k, cache, buff, access);      \
      }                                                            \
    }

union ARM_MMU_FIRST_LEVEL_DESCRIPTOR {
    unsigned long word;
    struct ARM_MMU_FIRST_LEVEL_FAULT fault;
    struct ARM_MMU_FIRST_LEVEL_PAGE_TABLE page_table;
    struct ARM_MMU_FIRST_LEVEL_SECTION section;
    struct ARM_MMU_FIRST_LEVEL_RESERVED reserved;
};

#define ARM_UNCACHEABLE                         0
#define ARM_CACHEABLE                           1
#define ARM_UNBUFFERABLE                        0
#define ARM_BUFFERABLE                          1

#define ARM_ACCESS_PERM_NONE_NONE               0
#define ARM_ACCESS_PERM_RO_NONE                 0
#define ARM_ACCESS_PERM_RO_RO                   0
#define ARM_ACCESS_PERM_RW_NONE                 1
#define ARM_ACCESS_PERM_RW_RO                   2
#define ARM_ACCESS_PERM_RW_RW                   3

void
hal_mmu_init(void)
{
    unsigned long ttb_base = SMDK2410_SDRAM_PHYS_BASE + 0x4000;
    unsigned long i;

    // Set the TTB register
    asm volatile ("mcr  p15,0,%0,c2,c0,0" : : "r"(ttb_base) /*:*/);

    // Set the Domain Access Control Register
    i = ARM_ACCESS_TYPE_MANAGER(0)    | 
        ARM_ACCESS_TYPE_NO_ACCESS(1)  |
        ARM_ACCESS_TYPE_NO_ACCESS(2)  |
        ARM_ACCESS_TYPE_NO_ACCESS(3)  |
        ARM_ACCESS_TYPE_NO_ACCESS(4)  |
        ARM_ACCESS_TYPE_NO_ACCESS(5)  |
        ARM_ACCESS_TYPE_NO_ACCESS(6)  |
        ARM_ACCESS_TYPE_NO_ACCESS(7)  |
        ARM_ACCESS_TYPE_NO_ACCESS(8)  |
        ARM_ACCESS_TYPE_NO_ACCESS(9)  |
        ARM_ACCESS_TYPE_NO_ACCESS(10) |
        ARM_ACCESS_TYPE_NO_ACCESS(11) |
        ARM_ACCESS_TYPE_NO_ACCESS(12) |
        ARM_ACCESS_TYPE_NO_ACCESS(13) |
        ARM_ACCESS_TYPE_NO_ACCESS(14) |
        ARM_ACCESS_TYPE_NO_ACCESS(15);
    asm volatile ("mcr  p15,0,%0,c3,c0,0" : : "r"(i) /*:*/);

    // First clear all TT entries - ie Set them to Faulting
    memset((void *)ttb_base, 0, ARM_FIRST_LEVEL_PAGE_TABLE_SIZE);

    // Memory layout after MMU is turned on
    //
    //   SDRAM_BASE_ADDRESS:     0x00000000,  64M
    //   SRAM_BASE_ADDRESS:      0x40000000,   4K
    //   SFR_BASE_ADDRESS:       0x48000000, 512M
    //   FLASH_BASE_ADDRESS:     0x80000000,   2M

    //               Actual  Virtual  Size   Attributes                                                  Function
    //               Base     Base     MB     cached?          buffered?         access permissions
    //             xxx00000  xxx00000
    X_ARM_MMU_SECTION(0x000,  0x800,    2,  ARM_UNCACHEABLE, ARM_UNBUFFERABLE, ARM_ACCESS_PERM_RW_RW); // Flash
    X_ARM_MMU_SECTION(0x300,  0x000,   64,  ARM_CACHEABLE,   ARM_BUFFERABLE,   ARM_ACCESS_PERM_RW_RW); // SDRAM
    X_ARM_MMU_SECTION(0x400,  0x400,    1,  ARM_CACHEABLE,   ARM_BUFFERABLE,   ARM_ACCESS_PERM_RW_RW); // SRAM
    X_ARM_MMU_SECTION(0x480,  0x480,  512,  ARM_UNCACHEABLE, ARM_UNBUFFERABLE, ARM_ACCESS_PERM_RW_RW); // SFRs
    X_ARM_MMU_SECTION(0x300,  0x300,   64,  ARM_UNCACHEABLE, ARM_UNBUFFERABLE, ARM_ACCESS_PERM_RW_RW); // Raw SDRAM
}

//----------------------------------------------------------------------------
// Platform specific initialization

// This routine sets the default GPIO condition
static void port_init(void)
{
    // Note: Follow the configuration order for setting the ports. 
    // 1) Set data register (GPnDAT) 
    // 2) Set control register (GPnCON)
    // 3) Configure pull-up's (GPnUP)

    //*** PORT A GROUP
    //Ports  : GPA22 GPA21  GPA20 GPA19 GPA18 GPA17 GPA16 GPA15 GPA14 GPA13 GPA12
    //Signal : nFCE nRSTOUT nFRE   nFWE  ALE   CLE  nGCS5 nGCS4 nGCS3 nGCS2 nGCS1
    //Binary :  1      1      1      1    1     1     1     1     1     1     1
    //-----------------------------------------------------------------------------------------
    //Ports  : GPA11   GPA10  GPA9   GPA8   GPA7   GPA6   GPA5   GPA4   GPA3   GPA2   GPA1  GPA0
    //Signal : ADDR26 ADDR25 ADDR24 ADDR23 ADDR22 ADDR21 ADDR20 ADDR19 ADDR18 ADDR17 ADDR16 ADDR0
    //Binary :  1       1      1      1      1      1      1      1      1      1      1      1
    HAL_WRITE_UINT32(GPACON, 0x7fffff);

    //**** PORT B GROUP