cpu/mpc86xx/cpu.c

/*
 * Copyright 2004 Freescale Semiconductor
 * Jeff Brown (jeffrey@freescale.com)
 * Srikanth Srinivasan (srikanth.srinivasan@freescale.com)
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program 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 of
 * the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <asm/cache.h>
#include <mpc86xx.h>

#if defined(CONFIG_OF_FLAT_TREE)
#include <ft_build.h>
#endif


// SS: For debug only, remove after use

static __inline__ unsigned long get_dbat3u (void)
{
   unsigned long dbat3u;
   asm volatile("mfspr %0, 542" : "=r" (dbat3u) :);
   return dbat3u;
}

static __inline__ unsigned long get_dbat3l (void)
{
   unsigned long dbat3l;
   asm volatile("mfspr %0, 543" : "=r" (dbat3l) :);
   return dbat3l;
}

static __inline__ unsigned long get_msr (void)
{
   unsigned long msr;
   asm volatile("mfmsr %0" : "=r" (msr) :);
   return msr;
}

extern unsigned long get_board_sys_clk(ulong dummy);

int checkcpu (void)
{
	sys_info_t sysinfo;
	uint pvr, svr;
	uint ver;
	uint major, minor;
	uint lcrr;		/* local bus clock ratio register */
	uint clkdiv;		/* clock divider portion of lcrr */
	
	puts("Freescale PowerPC\n");

	pvr = get_pvr();
	ver = PVR_VER(pvr);
	major = PVR_MAJ(pvr);
	minor = PVR_MIN(pvr);

	puts ("CPU:\n");

	printf("    Core: ");
	
	switch (ver) {
	case PVR_VER(PVR_86xx):
	    puts("E600");
	    break;
	default:
	    puts("Unknown");
	    break;
	}
	printf(", Version: %d.%d, (0x%08x)\n", major, minor, pvr);

	svr = get_svr();
	ver = SVR_VER(svr);
	major = SVR_MAJ(svr);
	minor = SVR_MIN(svr);

	puts("    System: ");
	switch (ver) {	
	case SVR_8641:
	        puts("8641");
	        break;
	case SVR_8641D:
		puts("8641D");
		break;
	default:
		puts("Unknown");
		break;
	}
	printf(", Version: %d.%d, (0x%08x)\n", major, minor, svr);

	get_sys_info(&sysinfo);

	puts("    Clocks: ");
	printf("CPU:%4lu MHz, ", sysinfo.freqProcessor / 1000000);
	printf("MPX:%4lu MHz, ", sysinfo.freqSystemBus / 1000000);
	printf("DDR:%4lu MHz, ", sysinfo.freqSystemBus / 2000000);
        	
#if defined(CFG_LBC_LCRR)
	lcrr = CFG_LBC_LCRR;
#else
	{
	    volatile immap_t *immap = (immap_t *)CFG_IMMR;
	    volatile ccsr_lbc_t *lbc= &immap->im_lbc;

	    lcrr = lbc->lcrr;
	}
#endif
	clkdiv = lcrr & 0x0f;
	if (clkdiv == 2 || clkdiv == 4 || clkdiv == 8) {
		printf("LBC:%4lu MHz\n",
		       sysinfo.freqSystemBus / 1000000 / clkdiv);
	} else {
		printf("    LBC: unknown (lcrr: 0x%08x)\n", lcrr);
	}

        printf("    L2: ");
        if (get_l2cr() & 0x80000000)
           printf("Enabled\n");
        else
           printf("Disabled\n");
        
	return (0);
}


/* -------------------------------------------------------------------- */

static inline void
soft_restart(unsigned long addr)
{

#ifndef CONFIG_MPC8641HPCN
   
	/* SRR0 has system reset vector, SRR1 has default MSR value */
	/* rfi restores MSR from SRR1 and sets the PC to the SRR0 value */

	__asm__ __volatile__ ("mtspr	26, %0"		:: "r" (addr));
	__asm__ __volatile__ ("li	4, (1 << 6)"	::: "r4");
	__asm__ __volatile__ ("mtspr	27, 4");
	__asm__ __volatile__ ("rfi");

#else /* CONFIG_MPC8641HPCN */
        out8(PIXIS_BASE+PIXIS_RST,0);
#endif /* !CONFIG_MPC8641HPCN */
	while(1);	/* not reached */
}



#ifdef CONFIG_MPC8641HPCN

int set_px_sysclk(ulong sysclk)
{
         u8 sysclk_s, sysclk_r, sysclk_v, vclkh, vclkl, sysclk_aux,tmp;

         /* Per table 27, page 58 of MPC8641HPCN spec*/
         switch(sysclk)
         {
            case 33:
               sysclk_s = 0x04;
               sysclk_r = 0x04;
               sysclk_v = 0x07;
               sysclk_aux = 0x00;
               break;
            case 40:
               sysclk_s = 0x01;
               sysclk_r = 0x1F;
               sysclk_v = 0x20;
               sysclk_aux = 0x01;
               break;
            case 50:
               sysclk_s = 0x01;
               sysclk_r = 0x1F;
               sysclk_v = 0x2A;
               sysclk_aux = 0x02;
               break;
            case 66:
               sysclk_s = 0x01;
               sysclk_r = 0x04;
               sysclk_v = 0x04;
               sysclk_aux = 0x03;
               break;
            case 83:
               sysclk_s = 0x01;
               sysclk_r = 0x1F;
               sysclk_v = 0x4B;
               sysclk_aux = 0x04;
               break;
            case 100:
               sysclk_s = 0x01;
               sysclk_r = 0x1F;
               sysclk_v = 0x5C;
               sysclk_aux = 0x05;
               break;
            case 134:
               sysclk_s = 0x06;
               sysclk_r = 0x1F;
               sysclk_v = 0x3B;
              sysclk_aux = 0x06; 
               break;
            case 166:
               sysclk_s = 0x06;
               sysclk_r = 0x1F;
               sysclk_v = 0x4B;
               sysclk_aux = 0x07;
               break;
            default:
               printf("Unsupported SYSCLK frequency.\n");
               return 0;
         }
         
         vclkh = (sysclk_s << 5) | sysclk_r ;
         vclkl = sysclk_v;
         out8(PIXIS_BASE+PIXIS_VCLKH,vclkh);
         out8(PIXIS_BASE+PIXIS_VCLKL,vclkl);

         out8(PIXIS_BASE+PIXIS_AUX,sysclk_aux);
         
         return 1;
}

int set_px_mpxpll(ulong mpxpll)
{
         u8 tmp;
         u8 val;
         switch(mpxpll)
         {
            case 2:
            case 4:
            case 6:
            case 8:
            case 10:
            case 12:
            case 14:
            case 16:
               val = (u8)mpxpll;
               break;
            default:
               printf("Unsupported MPXPLL ratio.\n");
               return 0;
         }

         tmp = in8(PIXIS_BASE+PIXIS_VSPEED1);
         tmp = (tmp & 0xF0) | (val & 0x0F);
         out8(PIXIS_BASE+PIXIS_VSPEED1,tmp);
         
         return 1;
}

int set_px_corepll(ulong corepll)
{
         u8 tmp;
         u8 val;
        
         switch((int)corepll)
         {
            case 20:
               val = 0x08;
               break;
            case 25:
               val = 0x0C;
               break;
            case 30:
               val = 0x10;
               break;
            case 35:
               val = 0x1C;
               break;
            case 40:
               val = 0x14;
               break;
            case 45:
               val = 0x0E;
               break;
            default:
               printf("Unsupported COREPLL ratio.\n");
               return 0;
         }
         
         tmp = in8(PIXIS_BASE+PIXIS_VSPEED0);
         tmp = (tmp & 0xE0) | (val & 0x1F);
         out8(PIXIS_BASE+PIXIS_VSPEED0,tmp);
         
         return 1;
}

void read_from_px_regs(int set)
{
         u8 tmp, mask = 0x1C;
         tmp = in8(PIXIS_BASE+PIXIS_VCFGEN0);
         if (set)
            tmp = tmp | mask;
         else
            tmp = tmp & ~mask;
         out8(PIXIS_BASE+PIXIS_VCFGEN0,tmp);                        
}

void read_from_px_regs_altbank(int set)
{
         u8 tmp, mask = 0x04;
         tmp = in8(PIXIS_BASE+PIXIS_VCFGEN1);
         if (set)
            tmp = tmp | mask;
         else
            tmp = tmp & ~mask;
         out8(PIXIS_BASE+PIXIS_VCFGEN1,tmp);   
}

void set_altbank(void)
{
         u8 tmp;
         tmp = in8(PIXIS_BASE+PIXIS_VBOOT);
         tmp ^= 0x40;
         out8(PIXIS_BASE+PIXIS_VBOOT,tmp);
 }


void set_px_go(void)
{
         u8 tmp;
         tmp = in8(PIXIS_BASE+PIXIS_VCTL);
         tmp = tmp & 0x1E;
         out8(PIXIS_BASE+PIXIS_VCTL,tmp);
         tmp = in8(PIXIS_BASE+PIXIS_VCTL);
         tmp = tmp | 0x01;
         out8(PIXIS_BASE+PIXIS_VCTL,tmp); 
}

void set_px_go_with_watchdog(void)
{
         u8 tmp;
         tmp = in8(PIXIS_BASE+PIXIS_VCTL);
         tmp = tmp & 0x1E;
         out8(PIXIS_BASE+PIXIS_VCTL,tmp);
         tmp = in8(PIXIS_BASE+PIXIS_VCTL);
         tmp = tmp | 0x09;
         out8(PIXIS_BASE+PIXIS_VCTL,tmp); 
}

/* This function takes the non-integral cpu:mpx pll ratio
 * and converts it to an integer that can be used to assign
 * FPGA register values.
 * input: strptr i.e. argv[2]
*/

ulong strfractoint(uchar *strptr)
{
   int i,j,retval,intarr_len=0, decarr_len=0, mulconst, no_dec=0;
   ulong intval =0, decval=0;
   uchar intarr[3], decarr[3];

   /* Assign the integer part to intarr[]
    * If there is no decimal point i.e.
    * if the ratio is an integral value
    * simply create the intarr.
   */
   i=0;
   while(strptr[i] != 46)
   {
      if(strptr[i] == 0)
      {
         no_dec = 1;
         break;    /* Break from loop once the end of string is reached */
      }
      
      intarr[i] = strptr[i];
      i++;
   }
   
   intarr_len = i; /* Assign length of integer part to intarr_len*/
   intarr[i] = '\0'; /* */

   if(no_dec)
   {
      mulconst=10; /* Currently needed only for single digit corepll ratios */
      decval = 0;
   }
   else
   {
      j=0;
      i++; /* Skipping the decimal point */
      while ((strptr[i] > 47) && (strptr[i] < 58))
      {
         decarr[j] = strptr[i];
         i++;
         j++;
      }
      
      decarr_len = j;
      decarr[j] = '\0';
      
      mulconst=1;
      for(i=0; i<decarr_len;i++)
         mulconst = mulconst*10;
      decval = simple_strtoul(decarr,NULL,10);      
   }

   intval = simple_strtoul(intarr,NULL,10);
   intval = intval*mulconst;

   retval = intval+decval;

   return retval;

}
   

#endif //CONFIG_MPC8641HPCN


/* no generic way to do board reset. simply call soft_reset. */
void
do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
        char cmd;
        ulong addr, val;
        ulong corepll;
        
                

#ifdef CFG_RESET_ADDRESS
	addr = CFG_RESET_ADDRESS;
#else
	/*
	 * note: when CFG_MONITOR_BASE points to a RAM address,
	 * CFG_MONITOR_BASE - sizeof (ulong) is usually a valid
	 * address. Better pick an address known to be invalid on your
	 * system and assign it to CFG_RESET_ADDRESS.
	 */
	addr = CFG_MONITOR_BASE - sizeof (ulong);
#endif

#ifndef CONFIG_MPC8641HPCN

       /* flush and disable I/D cache */
	__asm__ __volatile__ ("mfspr	3, 1008"	::: "r3");
	__asm__ __volatile__ ("ori	5, 5, 0xcc00"	::: "r5");
	__asm__ __volatile__ ("ori	4, 3, 0xc00"	::: "r4");
	__asm__ __volatile__ ("andc	5, 3, 5"	::: "r5");
	__asm__ __volatile__ ("sync");
	__asm__ __volatile__ ("mtspr	1008, 4");
	__asm__ __volatile__ ("isync");
	__asm__ __volatile__ ("sync");
	__asm__ __volatile__ ("mtspr	1008, 5");
	__asm__ __volatile__ ("isync");
	__asm__ __volatile__ ("sync");

        soft_restart(addr);

#else /* CONFIG_MPC8641HPCN */
        
        if(argc > 1)
        {
           cmd = argv[1][1];
           switch(cmd)
           {
              case 'f':    /* reset with frequency changed */

                 if (argc < 5)
                    goto my_usage;
                 
                 read_from_px_regs(0);
                 
                 val = set_px_sysclk(simple_strtoul(argv[2],NULL,10));
                 
                 corepll = strfractoint(argv[3]);
                 val = val + set_px_corepll(corepll);
                 val = val + set_px_mpxpll(simple_strtoul(argv[4],NULL,10));
                 if(val == 3)
                 {
                    printf("Setting registers VCFGEN0 and VCTL\n");
                    read_from_px_regs(1);
                    printf("Resetting board with values from VSPEED0, VSPEED1, VCLKH, and VCLKL ....\n");
                    set_px_go();
                 }
                 else
                    goto my_usage;
                 
                 while(1); /* Not reached */
                 
              case 'l':
                 if(argv[2][1] == 'f')
                 {
                    read_from_px_regs(0);
                    read_from_px_regs_altbank(0);
                    /* reset with frequency changed */
                    val = set_px_sysclk(simple_strtoul(argv[3],NULL,10));
                    
                    corepll = strfractoint(argv[4]);
                    val = val + set_px_corepll(corepll);
                    val = val + set_px_mpxpll(simple_strtoul(argv[5],NULL,10));
                    if(val == 3)
                    {
                       printf("Setting registers VCFGEN0, VCFGEN1, VBOOT, and VCTL\n");
                       set_altbank();
                       read_from_px_regs(1);
                       read_from_px_regs_altbank(1);
                       printf("Enabling watchdog timer on the FPGA and resetting board with values from VSPEED0, VSPEED1, VCLKH, and VCLKL to boot from the other bank ....\n");
                       set_px_go_with_watchdog();
                       
                    }
                    else
                       goto my_usage;
                 
                    while(1); /* Not reached */
                 }
                 else /* Reset from next bank without changing frequencies */
                 {
                    read_from_px_regs(0);
                    read_from_px_regs_altbank(0);
                    if(argc > 2)
                       goto my_usage;
                    printf("Setting registers VCFGEN1, VBOOT, and VCTL\n");
                    set_altbank();
                    read_from_px_regs_altbank(1);
                    printf("Enabling watchdog timer on the FPGA and resetting board to boot from the other bank....\n");
                    set_px_go_with_watchdog();
                    while(1); /* Not reached */
                 }

              default:
                 goto my_usage;
           }
my_usage:
           printf("\nUsage: reset cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio>\n");
           printf("       reset altbank [cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio>]\n");
           printf("For example:   reset cf 40 2.5 10\n");
           printf("See MPC8641HPCN Design Workbook for valid values of command line parameters.\n");
           return;
        }
        else
           out8(PIXIS_BASE+PIXIS_RST,0);
           
#endif /* !CONFIG_MPC8641HPCN */
        
	while(1);	/* not reached */
}


/* ------------------------------------------------------------------------- */

/*
 * Get timebase clock frequency
 */
unsigned long get_tbclk(void)
{
	sys_info_t  sys_info;

	get_sys_info(&sys_info);
	return ((sys_info.freqSystemBus + 3L) / 4L);

}

/* ------------------------------------------------------------------------- */

#if defined(CONFIG_WATCHDOG)
void
watchdog_reset(void)
{

}
#endif	/* CONFIG_WATCHDOG */

/* ------------------------------------------------------------------------- */

#if defined(CONFIG_DDR_ECC)
void dma_init(void) {
	volatile immap_t *immap = (immap_t *)CFG_IMMR;
	volatile ccsr_dma_t *dma = &immap->im_dma;

	dma->satr0 = 0x00040000;
	dma->datr0 = 0x00040000;
	asm("sync; isync");
	return;
}

uint dma_check(void) {
	volatile immap_t *immap = (immap_t *)CFG_IMMR;
	volatile ccsr_dma_t *dma = &immap->im_dma;
	volatile uint status = dma->sr0;

	/* While the channel is busy, spin */
	while((status & 4) == 4) {
		status = dma->sr0;
	}

	if (status != 0) {
		printf ("DMA Error: status = %x\n", status);
	}
	return status;
}

int dma_xfer(void *dest, uint count, void *src) {
	volatile immap_t *immap = (immap_t *)CFG_IMMR;
	volatile ccsr_dma_t *dma = &immap->im_dma;

	dma->dar0 = (uint) dest;
	dma->sar0 = (uint) src;
	dma->bcr0 = count;
	dma->mr0 = 0xf000004;
	asm("sync;isync");
	dma->mr0 = 0xf000005;
	asm("sync;isync");
	return dma_check();
}
#endif	/* CONFIG_DDR_ECC */


#ifdef CONFIG_OF_FLAT_TREE
void ft_cpu_setup(void *blob, bd_t *bd)
{
	u32 *p;
	ulong clock;
	int len;
  
	clock = bd->bi_busfreq;
	p = ft_get_prop(blob, "/cpus/" OF_CPU "/bus-frequency", &len);
	if (p != NULL)
		*p = cpu_to_be32(clock);

	p = ft_get_prop(blob, "/" OF_SOC "/serial@4500/clock-frequency", &len);
	if (p != NULL)
		*p = cpu_to_be32(clock);

	p = ft_get_prop(blob, "/" OF_SOC "/serial@4600/clock-frequency", &len);
	if (p != NULL)
		*p = cpu_to_be32(clock);

#if defined(CONFIG_MPC86XX_TSEC1)
	p = ft_get_prop(blob, "/" OF_SOC "/ethernet@24000/address", &len);
	memcpy(p, bd->bi_enetaddr, 6);
#endif
 
#if defined(CONFIG_MPC86XX_TSEC2)
	p = ft_get_prop(blob, "/" OF_SOC "/ethernet@25000/address", &len);
	memcpy(p, bd->bi_enet1addr, 6);
#endif

#if defined(CONFIG_MPC86XX_TSEC3)
	p = ft_get_prop(blob, "/" OF_SOC "/ethernet@26000/address", &len);
	memcpy(p, bd->bi_enet2addr, 6);
#endif

#if defined(CONFIG_MPC86XX_TSEC4)
	p = ft_get_prop(blob, "/" OF_SOC "/ethernet@27000/address", &len);
	 memcpy(p, bd->bi_enet3addr, 6);
#endif

}
#endif