FreeRTOS/Demo/CORTEX_A5_SAMA5D4x_EK_IAR/AtmelFiles/libchip_sama5d4x/source/mmu.c

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 * Copyright (c) 2013, Atmel Corporation
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/** \file */

/** 
 * \addtogroup mmu MMU Initialization
 *
 * \section Usage
 *
 * Translation Lookaside Buffers (TLBs) are an implementation technique that caches translations or
 * translation table entries. TLBs avoid the requirement for every memory access to perform a translation table
 * lookup. The ARM architecture does not specify the exact form of the TLB structures for any design. In a
 * similar way to the requirements for caches, the architecture only defines certain principles for TLBs:
 * 
 * The MMU supports memory accesses based on memory sections or pages:
 * Supersections Consist of 16MB blocks of memory. Support for Supersections is optional.
 * -# Sections Consist of 1MB blocks of memory.
 * -# Large pages Consist of 64KB blocks of memory.
 * -# Small pages Consist of 4KB blocks of memory.
 *
 * Access to a memory region is controlled by the access permission bits and the domain field in the TLB entry.
 * Memory region attributes
 * Each TLB entry has an associated set of memory region attributes. These control accesses to the caches,
 * how the write buffer is used, and if the memory region is Shareable and therefore must be kept coherent.
 *
 * Related files:\n
 * \ref mmu.c\n
 * \ref mmu.h \n
 */
 
/*------------------------------------------------------------------------------ */
/*         Headers                                                               */
/*------------------------------------------------------------------------------ */
#include <chip.h>

/*------------------------------------------------------------------------------ */
/*         Exported functions */
/*------------------------------------------------------------------------------ */

/**
 * \brief Initializes MMU.
 * \param pTB  Address of the translation table.
 */
void MMU_Initialize(uint32_t *pTB)
{
    unsigned int index;
    unsigned int addr;

    /* Reset table entries */
    for (index = 0; index < 4096; index++)
        pTB[index] = 0;

    /* section Boot (code + data)*/
    /* ROM address (after remap) 0x0000_0000*/
    pTB[0x000] = (0x000 << 20)| // Physical Address
                    ( 3 << 10)| // Access in supervisor mode (AP)
                  ( 0xF <<  5)| // Domain 0xF
                    ( 1 <<  4)| // (XN)
                    ( 0 <<  3)| // C bit : cachable => NO
                    ( 1 <<  2)| // B bit : write-back => YES
                    ( 2 <<  0); // Set as 1 Mbyte section

    /* section ROM (code + data) */
    /* ROM address (after remap) 0x0010_0000 */
    pTB[0x001] = (0x001 << 20)| // Physical Address
                    ( 3 << 10)| // Access in supervisor mode (AP)
                  ( 0xF <<  5)| // Domain 0xF
                    ( 1 <<  4)| // (XN)
                    ( 0 <<  3)| // C bit : cachable => NO
                    ( 1 <<  2)| // B bit : write-back => YES
                    ( 2 <<  0); // Set as 1 Mbyte section
    /* section RAM 0 */
    /* SRAM address (after remap) 0x0030_0000 */
    pTB[0x002] = (0x002 << 20)| // Physical Address
                    ( 1 << 12)| // TEX[0]
                    ( 3 << 10)| // Access in supervisor mode (AP)
                  ( 0xF <<  5)| // Domain 0xF
                    ( 1 <<  4)| // (XN)
                    ( 1 <<  3)| // C bit : cachable => YES
                    ( 1 <<  2)| // B bit : write-back => YES
                    ( 2 <<  0); // Set as 1 Mbyte section

    /* section NFC SRAM  */
    /* SRAM address 0x0040_0000 */
    for(addr = 0x3; addr < 0xB; addr++)
        pTB[addr] = (addr << 20)|   // Physical Address
                      ( 3 << 10)|   // Access in supervisor mode (AP)
                    ( 0xF <<  5)|   // Domain 0xF
                      ( 1 <<  4)|   // (XN)
                      ( 0 <<  3)|   // C bit : cachable => NO
                      ( 1 <<  2)|   // B bit : write-back => YES
                      ( 2 <<  0);   // Set as 1 Mbyte section

    /* section PERIPH */
    /* periph address 0xF000_0000 */
    pTB[0xF00] = (0xF00ul << 20)| // Physical Address
                      ( 3 << 10)| // Access in supervisor mode (AP)
                    ( 0xF <<  5)| // Domain 0
                      ( 1 <<  4)| // (XN)
                      ( 0 <<  3)| // C bit : cachable => NO
                      ( 0 <<  2)| // B bit : write-back => NO
                      ( 2 <<  0); // Set as 1 Mbyte section

    /* section PERIPH */
    /* periph address 0xF800_0000 */
    pTB[0xF80] = (0xF80ul << 20)| // Physical Address
                      ( 3 << 10)| // Access in supervisor mode (AP)
                    ( 0xF <<  5)| // Domain 0xF
                      ( 1 <<  4)| // (XN)
                      ( 0 <<  3)| // C bit : cachable => NO
                      ( 0 <<  2)| // B bit : write-back => NO
                      ( 2 <<  0); // Set as 1 Mbyte section

    /* section PERIPH */
    /* periph address 0xFC00_0000 */
    pTB[0xFC0] = (0xFC0ul << 20)| // Physical Address
                      ( 3 << 10)| // Access in supervisor mode (AP)
                    ( 0xF <<  5)| // Domain 0xF
                      ( 1 <<  4)| // (XN)
                      ( 0 <<  3)| // C bit : cachable => NO
                      ( 0 <<  2)| // B bit : write-back => NO
                      ( 2 <<  0); // Set as 1 Mbyte section

    /* section EBI CS0 */
    /* periph address 0x1000_0000 */
    for(addr = 0x100; addr < 0x200; addr++)
        pTB[addr] = (addr << 20)| // Physical Address
                      ( 3 << 10)| // Access in supervisor mode (AP)
                    ( 0xF <<  5)| // Domain 0
                      ( 1 <<  4)| // (XN)
                      ( 0 <<  3)| // C bit : cachable => NO
                      ( 0 <<  2)| // B bit : write-back => NO
                      ( 2 <<  0); // Set as 1 Mbyte section

    /* section EBI CS1 */
    /* periph address 0x6000_0000 */
    for(addr = 0x600; addr < 0x700; addr++)
        pTB[addr] = (addr << 20)| // Physical Address
                      ( 3 << 10)| // Access in supervisor mode (AP)
                    ( 0xF <<  5)| // Domain 0xF
                      ( 1 <<  4)| // (XN)
                      ( 0 <<  3)| // C bit : cachable => NO
                      ( 0 <<  2)| // B bit : write-back => NO
                      ( 2 <<  0); // Set as 1 Mbyte section

    /* section EBI CS2 */
    /* periph address 0x7000_0000 */
    for(addr = 0x700; addr < 0x800; addr++)
        pTB[addr] = (addr << 20)| // Physical Address
                      ( 3 << 10)| // Access in supervisor mode (AP)
                    ( 0xF <<  5)| // Domain 0xF
                      ( 1 <<  4)| // (XN)
                      ( 0 <<  3)| // C bit : cachable => NO
                      ( 0 <<  2)| // B bit : write-back => NO
                      ( 2 <<  0); // Set as 1 Mbyte section

    /* section EBI CS3 */
    /* periph address 0x8000_0000 */
    for(addr = 0x800; addr < 0x880; addr++)
        pTB[addr] = (addr << 20)| // Physical Address
                      ( 3 << 10)| // Access in supervisor mode (AP)
                    ( 0xF <<  5)| // Domain 0xF
                      ( 1 <<  4)| // (XN)
                      ( 0 <<  3)| // C bit : cachable => NO
                      ( 0 <<  2)| // B bit : write-back => NO
                      ( 2 <<  0); // Set as 1 Mbyte section

    /* section NFC */
    /* periph address 0x9000_0000 */
    for(addr = 0x900; addr < 0xA00; addr++)
        pTB[addr] = (addr << 20)| // Physical Address
                      ( 3 << 10)| // Access in supervisor mode (AP)
                    ( 0xF <<  5)| // Domain 0xF
                      ( 1 <<  4)| // (XN)
                      ( 0 <<  3)| // C bit : cachable => NO
                      ( 0 <<  2)| // B bit : write-back => NO
                      ( 2 <<  0); // Set as 1 Mbyte section

    /* section SDRAM/DDRAM */
    /* periph address 0x2000_0000 */
    for(addr = 0x200; addr < 0x240; addr++)
        pTB[addr] = (addr << 20)|   // Physical Address
                      ( 3 << 10)|   // Access in supervisor mode (AP)
                      //(0x1 << 14)|   // TEX[2]
                      (0x1 << 12)|   // TEX[1:0]
                      (0xF <<  5)|   // Domain 0xF
                      ( 1  <<  3)|   // C bit : cachable => YES
                      ( 1  <<  2)|   // B bit : write-back => YES
                      ( 2  <<  0);   // Set as 1 Mbyte section

/* section SDRAM/DDRAM */
    /* periph address 0x2400_0000 */
    for(addr = 0x240; addr < 0x400; addr++)
        pTB[addr] = (addr << 20)|   // Physical Address
                      ( 1 << 19)|   // (NS)  Non-secure access is allowed        
                      ( 3 << 10)|   // Access in supervisor mode (AP)
                      ( 0xF <<  5)| // Domain 0xF
                      ( 1 <<  4)|   // (XN)
                      ( 0 <<  3)|   // C bit : cachable => No
                      ( 0 <<  2)|   // B bit : write-back => No
                      ( 2 <<  0);   // Set as 1 Mbyte section
    
    
    /* section DDRCS/AES */
    /* periph address 0x4000_0000 */
    for(addr = 0x400; addr < 0x600; addr++)
        pTB[addr] = (addr << 20)|   // Physical Address
                      ( 3 << 10)|   // Access in supervisor mode (AP)
                      ( 1 << 12)|   // TEX[0]
                    ( 0xF <<  5)|   // Domain 0xF
                      ( 1 <<  3)|   // C bit : cachable => YES
                      ( 1 <<  2)|   // B bit : write-back => YES
                      ( 2 <<  0);   // Set as 1 Mbyte section


    CP15_WriteTTB((unsigned int)pTB);
    /* Program the domain access register */
    CP15_WriteDomainAccessControl(0xC0000000); // only domain 15: access are not checked
}