rt-thread-official/libcpu/arm/s3c24x0/mmu.c

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2008-04-25     Yi.qiu       first version
 * 2009-12-18     Bernard      port to armcc
 */

#include <rtthread.h>
#include "s3c24x0.h"

#define _MMUTT_STARTADDRESS  0x33FF0000

#define DESC_SEC        (0x2|(1<<4))
#define CB              (3<<2)  //cache_on, write_back
#define CNB             (2<<2)  //cache_on, write_through
#define NCB             (1<<2)  //cache_off,WR_BUF on
#define NCNB                (0<<2)  //cache_off,WR_BUF off
#define AP_RW           (3<<10) //supervisor=RW, user=RW
#define AP_RO           (2<<10) //supervisor=RW, user=RO

#define DOMAIN_FAULT    (0x0)
#define DOMAIN_CHK      (0x1)
#define DOMAIN_NOTCHK   (0x3)
#define DOMAIN0         (0x0<<5)
#define DOMAIN1         (0x1<<5)

#define DOMAIN0_ATTR    (DOMAIN_CHK<<0)
#define DOMAIN1_ATTR    (DOMAIN_FAULT<<2)

#define RW_CB       (AP_RW|DOMAIN0|CB|DESC_SEC)
#define RW_CNB      (AP_RW|DOMAIN0|CNB|DESC_SEC)
#define RW_NCNB     (AP_RW|DOMAIN0|NCNB|DESC_SEC)
#define RW_FAULT    (AP_RW|DOMAIN1|NCNB|DESC_SEC)

#ifdef __GNUC__
void mmu_setttbase(register rt_uint32_t i)
{
    asm volatile ("mcr p15, 0, %0, c2, c0, 0": :"r" (i));
}

void mmu_set_domain(register rt_uint32_t i)
{
    asm volatile ("mcr p15,0, %0, c3, c0,  0": :"r" (i));
}

void mmu_enable()
{
    register rt_uint32_t i;

    /* read control register */
    asm volatile ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));

    i |= 0x1;

    /* write back to control register */
    asm volatile ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
}

void mmu_disable()
{
    register rt_uint32_t i;

    /* read control register */
    asm volatile ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));

    i &= ~0x1;

    /* write back to control register */
    asm volatile ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
}

void mmu_enable_icache()
{
    register rt_uint32_t i;

    /* read control register */
    asm volatile ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));

    i |= (1 << 12);

    /* write back to control register */
    asm volatile ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
}

void mmu_enable_dcache()
{
    register rt_uint32_t i;

    /* read control register */
    asm volatile ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));

    i |= (1 << 2);

    /* write back to control register */
    asm volatile ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
}

void mmu_disable_icache()
{
    register rt_uint32_t i;

    /* read control register */
    asm volatile ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));

    i &= ~(1 << 12);

    /* write back to control register */
    asm volatile ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
}

void mmu_disable_dcache()
{
    register rt_uint32_t i;

    /* read control register */
    asm volatile ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));

    i &= ~(1 << 2);

    /* write back to control register */
    asm volatile ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
}

void mmu_enable_alignfault()
{
    register rt_uint32_t i;

    /* read control register */
    asm volatile ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));

    i |= (1 << 1);

    /* write back to control register */
    asm volatile ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
}

void mmu_disable_alignfault()
{
    register rt_uint32_t i;

    /* read control register */
    asm volatile ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));

    i &= ~(1 << 1);

    /* write back to control register */
    asm volatile ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
}

void mmu_clean_invalidated_cache_index(int index)
{
    asm volatile ("mcr p15, 0, %0, c7, c14, 2": :"r" (index));
}

void mmu_invalidate_tlb()
{
    asm volatile ("mcr p15, 0, %0, c8, c7, 0": :"r" (0));
}

void mmu_invalidate_icache()
{
    asm volatile ("mcr p15, 0, %0, c7, c5, 0": :"r" (0));
}
#endif

#ifdef __CC_ARM
void mmu_setttbase(rt_uint32_t i)
{
    __asm volatile
    {
        mcr p15, 0, i, c2, c0, 0
    }
}

void mmu_set_domain(rt_uint32_t i)
{
    __asm volatile
    {
        mcr p15,0, i, c3, c0,  0
    }
}

void mmu_enable()
{
    register rt_uint32_t value;

    __asm volatile
    {
        mrc p15, 0, value, c1, c0, 0
        orr value, value, #0x01
        mcr p15, 0, value, c1, c0, 0
    }
}

void mmu_disable()
{
    register rt_uint32_t value;

    __asm volatile
    {
        mrc p15, 0, value, c1, c0, 0
        bic value, value, #0x01
        mcr p15, 0, value, c1, c0, 0
    }
}

void mmu_enable_icache()
{
    register rt_uint32_t value;

    __asm volatile
    {
        mrc p15, 0, value, c1, c0, 0
        orr value, value, #0x1000
        mcr p15, 0, value, c1, c0, 0
    }
}

void mmu_enable_dcache()
{
    register rt_uint32_t value;

    __asm volatile
    {
        mrc p15, 0, value, c1, c0, 0
        orr value, value, #0x04
        mcr p15, 0, value, c1, c0, 0
    }
}

void mmu_disable_icache()
{
    register rt_uint32_t value;

    __asm volatile
    {
        mrc p15, 0, value, c1, c0, 0
        bic value, value, #0x1000
        mcr p15, 0, value, c1, c0, 0
    }
}

void mmu_disable_dcache()
{
    register rt_uint32_t value;

    __asm volatile
    {
        mrc p15, 0, value, c1, c0, 0
        bic value, value, #0x04
        mcr p15, 0, value, c1, c0, 0
    }
}

void mmu_enable_alignfault()
{
    register rt_uint32_t value;

    __asm volatile
    {
        mrc p15, 0, value, c1, c0, 0
        orr value, value, #0x02
        mcr p15, 0, value, c1, c0, 0
    }
}

void mmu_disable_alignfault()
{
    register rt_uint32_t value;

    __asm volatile
    {
        mrc p15, 0, value, c1, c0, 0
        bic value, value, #0x02
        mcr p15, 0, value, c1, c0, 0
    }
}

void mmu_clean_invalidated_cache_index(int index)
{
    __asm volatile
    {
        mcr p15, 0, index, c7, c14, 2
    }
}

void mmu_invalidate_tlb()
{
    register rt_uint32_t value;

    value = 0;
    __asm volatile
    {
        mcr p15, 0, value, c8, c7, 0
    }
}

void mmu_invalidate_icache()
{
    register rt_uint32_t value;

    value = 0;

    __asm volatile
    {
        mcr p15, 0, value, c7, c5, 0
    }
}
#endif

void mmu_setmtt(int vaddrStart,int vaddrEnd,int paddrStart,int attr)
{
    volatile rt_uint32_t *pTT;
    volatile int i,nSec;
    pTT=(rt_uint32_t *)_MMUTT_STARTADDRESS+(vaddrStart>>20);
    nSec=(vaddrEnd>>20)-(vaddrStart>>20);
    for(i=0;i<=nSec;i++)
    {
        *pTT = attr |(((paddrStart>>20)+i)<<20);
        pTT++;
    }
}

void rt_hw_mmu_init(void)
{
    int i,j;
    //========================== IMPORTANT NOTE =========================
    //The current stack and code area can't be re-mapped in this routine.
    //If you want memory map mapped freely, your own sophiscated mmu
    //initialization code is needed.
    //===================================================================

    mmu_disable_dcache();
    mmu_disable_icache();

    //If write-back is used,the DCache should be cleared.
    for(i=0;i<64;i++)
        for(j=0;j<8;j++)
            mmu_clean_invalidated_cache_index((i<<26)|(j<<5));

    mmu_invalidate_icache();

    //To complete mmu_Init() fast, Icache may be turned on here.
    mmu_enable_icache();

    mmu_disable();
    mmu_invalidate_tlb();

    //mmu_setmtt(int vaddrStart,int vaddrEnd,int paddrStart,int attr);
    mmu_setmtt(0x00000000,0x07f00000,0x00000000,RW_CNB);  //bank0
    mmu_setmtt(0x00000000,0x03f00000,(int)0x30000000,RW_CB);  //bank0
    mmu_setmtt(0x04000000,0x07f00000,0,RW_NCNB);            //bank0
    mmu_setmtt(0x08000000,0x0ff00000,0x08000000,RW_CNB);  //bank1
    mmu_setmtt(0x10000000,0x17f00000,0x10000000,RW_NCNB); //bank2
    mmu_setmtt(0x18000000,0x1ff00000,0x18000000,RW_NCNB); //bank3
    //mmu_setmtt(0x20000000,0x27f00000,0x20000000,RW_CB); //bank4
    mmu_setmtt(0x20000000,0x27f00000,0x20000000,RW_NCNB); //bank4 for  DM9000
    mmu_setmtt(0x28000000,0x2ff00000,0x28000000,RW_NCNB); //bank5
    //30f00000->30100000, 31000000->30200000
    mmu_setmtt(0x30000000,0x30100000,0x30000000,RW_CB);   //bank6-1
    mmu_setmtt(0x30200000,0x33e00000,0x30200000,RW_CB); //bank6-2

    mmu_setmtt(0x33f00000,0x34000000,0x33f00000,RW_NCNB);   //bank6-3
    mmu_setmtt(0x38000000,0x3ff00000,0x38000000,RW_NCNB); //bank7

    mmu_setmtt(0x40000000,0x47f00000,0x40000000,RW_NCNB); //SFR
    mmu_setmtt(0x48000000,0x5af00000,0x48000000,RW_NCNB); //SFR
    mmu_setmtt(0x5b000000,0x5b000000,0x5b000000,RW_NCNB); //SFR
    mmu_setmtt(0x5b100000,0xfff00000,0x5b100000,RW_FAULT);//not used
    mmu_setmtt(0x60000000,0x67f00000,0x60000000,RW_NCNB); //SFR

    mmu_setttbase(_MMUTT_STARTADDRESS);

    /* DOMAIN1: no_access, DOMAIN0,2~15=client(AP is checked) */
    mmu_set_domain(0x55555550|DOMAIN1_ATTR|DOMAIN0_ATTR);

    mmu_enable_alignfault();

    mmu_enable();

    /* ICache enable */
    mmu_enable_icache();
    /* DCache should be turned on after mmu is turned on. */
    mmu_enable_dcache();
}