hal_cache.h

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#ifndef CYGONCE_HAL_CACHE_H
#define CYGONCE_HAL_CACHE_H

//=============================================================================
//
//      hal_cache.h
//
//      HAL cache control API
//
//=============================================================================
//####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):   hmt
// Contributors:hmt
// Date:        1999-07-05
// Purpose:     Cache control API
// Description: The macros defined here provide the HAL APIs for handling
//              cache control operations.
// Usage:
//              #include <cyg/hal/hal_cache.h>
//              ...
//              
//
//####DESCRIPTIONEND####
//
//=============================================================================

#include <cyg/infra/cyg_type.h>
//#include <cyg/hal/hal_mmu.h>

//-----------------------------------------------------------------------------
// FIXME: This definition forces the IO flash driver to use a
// known-good procedure for fiddling flash before calling flash device
// driver functions. The procedure breaks on other platform/driver
// combinations though so is depricated. Hence this definition.
//
// If you work on this target, please try to remove this definition
// and verify that the flash driver still works (both from RAM and
// flash). If it does, remove the definition and this comment for good
// [and the old macro definition if this happens to be the last client
// of that code].
#define HAL_FLASH_CACHES_OLD_MACROS

//-----------------------------------------------------------------------------
// Cache dimensions

#define HAL_DCACHE_SIZE                 0x4000 // Size of data cache in bytes
#define HAL_DCACHE_LINE_SIZE            32     // Size of a data cache line
#define HAL_DCACHE_WAYS                 32     // Associativity of the cache
#define HAL_DCACHE_SETS (HAL_UCACHE_SIZE/(HAL_UCACHE_LINE_SIZE*HAL_UCACHE_WAYS))

#define HAL_ICACHE_SIZE                 0x4000 // Size of instruction cache in bytes
#define HAL_ICACHE_LINE_SIZE            32     // Size of ins cache line
#define HAL_ICACHE_WAYS                 32     // Associativity of the cache
#define HAL_ICACHE_SETS (HAL_UCACHE_SIZE/(HAL_UCACHE_LINE_SIZE*HAL_UCACHE_WAYS))

//-----------------------------------------------------------------------------
// Global control of data cache

// Enable the data cache
#define HAL_DCACHE_ENABLE()                                             \
CYG_MACRO_START                                                         \
    /* SA-110 manual states that the control reg is read-write */       \
    asm volatile (                                                      \
        "mrc  p15,0,r1,c1,c0,0;"                                        \
        "orr  r1,r1,#0x000F;" /* ensure MM is enabled */                \
        "mcr  p15,0,r1,c1,c0,0"                                         \
        :                                                               \
        :                                                               \
        : "r1" /* Clobber list */                                       \
        );                                                              \
CYG_MACRO_END

// Disable the data cache (and invalidate it, required semanitcs)
#define HAL_DCACHE_DISABLE()                                            \
CYG_MACRO_START                                                         \
    /* SA-110 manual states that the control reg is read-write */       \
    asm volatile (                                                      \
        "mrc  p15,0,r1,c1,c0,0;"                                        \
        "bic  r1,r1,#0x000C;" /* but leave MM alone */                  \
        "mcr  p15,0,r1,c1,c0,0;"                                        \
        "mov    r1,#0;"                                                 \
        "mcr  p15,0,r1,c7,c6,0" /* clear data cache */                  \
        :                                                               \
        :                                                               \
        : "r1" /* Clobber list */                                       \
        );                                                              \
CYG_MACRO_END

// Invalidate the entire cache (and both TLBs, just in case)
#define HAL_DCACHE_INVALIDATE_ALL()                                     \
CYG_MACRO_START                                                         \
    /* this macro can discard dirty cache lines. */                     \
    asm volatile (                                                      \
        "mov    r1,#0;"                                                 \
        "mcr    p15,0,r1,c7,c6,0;"  /* clear data cache */              \
        "mcr    p15,0,r1,c8,c7,0;"  /* flush I+D TLBs */                \
        :                                                               \
        :                                                               \
        : "r1","memory" /* Clobber list */                              \
        );                                                              \
CYG_MACRO_END
     

// Synchronize the contents of the cache with memory.
#define HAL_DCACHE_SYNC()                                               \
CYG_MACRO_START                                                         \
    /* This is slightly naff in that the only way to force a dirty */   \
    /* line out is by loading other data into its slot, so         */   \
    /* invalidating that slot.                                     */   \
    asm volatile (                                                      \
        "mov    r0, #0x50000000;" /* 21285~s cache flush region */      \
        "add    r1, r0, #0x4000;" /* 16MB of fast don~t-care amnesia */ \
 "667: "                          /* We read in 16kB of it */           \
        "ldr    r2, [r0], #32;"                                         \
        "teq    r1, r0;"                                                \
        "bne    667b;"                                                  \
        "mov    r0,#0;"                                                 \
        "mcr    p15,0,r0,c7,c6,0;"  /* clear data cache */              \
        "mcr    p15,0,r0,c7,c10,4;" /* and drain the write buffer */    \
        :                                                               \
        :                                                               \
        : "r0","r1","r2" /* Clobber list */                             \
        );                                                              \
CYG_MACRO_END

// Query the state of the data cache
#define HAL_DCACHE_IS_ENABLED(_state_)                                  \
CYG_MACRO_START                                                         \
    /* SA-110 manual states clearly that the control reg is readable */ \
    register int reg;                                                   \
    asm volatile ("mrc  p15,0,%0,c1,c0,0"                               \
                  : "=r"(reg)                                           \
                  :                                                     \
                /*:*/                                                   \
        );                                                              \
    (_state_) = (0 != (4 & reg)); /* Bit 2 is DCache enable */          \
CYG_MACRO_END

// Set the data cache refill burst size
//#define HAL_DCACHE_BURST_SIZE(_size_)

// Set the data cache write mode
//#define HAL_DCACHE_WRITE_MODE( _mode_ )

#define HAL_DCACHE_WRITETHRU_MODE       0
#define HAL_DCACHE_WRITEBACK_MODE       1

// Get the current writeback mode - or only writeback mode if fixed
#define HAL_DCACHE_QUERY_WRITE_MODE( _mode_ ) CYG_MACRO_START           \
    _mode_ = HAL_DCACHE_WRITEBACK_MODE;                                 \
CYG_MACRO_END