cpu.c

PPC860常见外围驱动

/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * 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
 */

/*
 * m8xx.c
 *
 * CPU specific code
 *
 * written or collected and sometimes rewritten by
 * Magnus Damm <[e-mail]>
 *
 * minor modifications by
 * Wolfgang Denk <[e-mail]>
 */

#include <ppcboot.h>
#include <command.h>
#include <mpc8xx.h>
#include <asm/cache.h>

#if (defined(CONFIG_MPC860) || defined(CONFIG_MPC855))
# ifdef	CONFIG_MPC855
#  define	ID_STR	"PC855"
# else
#  define	ID_STR	"PC860"
# endif

static int check_CPU(long clock, uint pvr, uint immr)
{
  volatile immap_t *immap = (immap_t *)(immr & 0xFFFF0000);
  uint k, m;
  char buf[32];

  /* the highest 16 bits should be 0x0050 for a 860 */

  if((pvr >> 16) != 0x0050)
    return -1;

  k = (immr << 16) | *((ushort *) &immap->im_cpm.cp_dparam[0xB0]);
  m = 0;

  switch(k) {
  case 0x00020001 : printf("p" ID_STR "xxZPnn");	break;
  case 0x00030001 : printf("X" ID_STR "xxZPnn");	break;

  case 0x00120003 : printf("X" ID_STR "xxZPnnA");	break;
  case 0x00130003 : printf("X" ID_STR "xxZPnnA3");	break;

  case 0x00200004 : printf("X" ID_STR "xxZPnnB");	break;

  case 0x00300004 : printf("X" ID_STR "xxZPnnC");	break;
  case 0x00310004 : printf("X" ID_STR "xxZPnnC1");	m = 1; break;


  case 0x00200064 : printf("X" ID_STR "SRZPnnB");	break;
  case 0x00300065 : printf("X" ID_STR "SRZPnnC");	break;
  case 0x00310065 : printf("X" ID_STR "SRZPnnC1");	m = 1; break;
  case 0x05010000 : printf("X" ID_STR "xxZPnnD3");	m = 1; break;
  case 0x05020000 : printf("X" ID_STR "xxZPnnD4");	m = 1; break;

    /* this value is not documented anywhere */

  case 0x40000000 : printf("P" ID_STR "PZPnnD");	m = 1; break;

  default: printf("unknown M" ID_STR " (0x%08x)", k);
  }

  printf(" at %s MHz:", strmhz(buf, clock));

  printf(" %u kB I-Cache", checkicache() >> 10);
  printf(" %u kB D-Cache", checkdcache() >> 10);

  /* lets check and see if we're running on a 860T (or P?) */

  immap->im_cpm.cp_fec.fec_addr_low = 0x12345678;
  if(immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) {
    printf(" FEC present");
  }

  if(!m) {
    printf("\n         *** Warning: CPU Core has Silicon Bugs -- Check the Errata ***");
  }

  printf("\n");

  return 0;
}

#elif defined(CONFIG_MPC823)

static int check_CPU(long clock, uint pvr, uint immr)
{
  volatile immap_t *immap = (immap_t *)(immr & 0xFFFF0000);
  uint k, m;
  char buf[32];

  /* the highest 16 bits should be 0x0050 for a 8xx */

  if((pvr >> 16) != 0x0050)
    return -1;

  k = (immr << 16) | *((ushort *) &immap->im_cpm.cp_dparam[0xB0]);
  m = 0;

  switch(k) {
  /* MPC823 */
  case 0x20000000 : printf("PPC823ZTnn0");	break;
  case 0x20010000 : printf("PPC823ZTnn0.1");	break;
  case 0x20020000 : printf("PPC823ZTnnZ2/3");	break;
  case 0x20020001 : printf("PPC823ZTnnZ3");	break;
  case 0x21000000 : printf("PPC823ZTnnA");	break;
  case 0x21010000 : printf("PPC823ZTnnB");	m=1; break;
  case 0x21010001 : printf("PPC823ZTnnB2");	m=1; break;
  /* MPC823E */
  case 0x24010000 : printf("PPC823EZTnnB2");	m=1; break;

  default: printf("unknown MPC823 (0x%08x)", k);
  }
  printf(" at %s MHz:", strmhz(buf, clock));

  printf(" %u kB I-Cache", checkicache() >> 10);
  printf(" %u kB D-Cache", checkdcache() >> 10);

  /* lets check and see if we're running on a 860T (or P?) */

  immap->im_cpm.cp_fec.fec_addr_low = 0x12345678;
  if(immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) {
    printf(" FEC present");
  }

  if(!m) {
    printf("\n         *** Warning: CPU Core has Silicon Bugs -- Check the Errata ***");
  }

  printf("\n");

  return 0;
}

#elif defined(CONFIG_MPC850)

static int check_CPU(long clock, uint pvr, uint immr)
{
  volatile immap_t *immap = (immap_t *)(immr & 0xFFFF0000);
  uint k, m;
  char buf[32];

  /* the highest 16 bits should be 0x0050 for a 8xx */

  if((pvr >> 16) != 0x0050)
    return -1;

  k = (immr << 16) | *((ushort *) &immap->im_cpm.cp_dparam[0xB0]);
  m = 0;

  switch(k)
  {
  case 0x20020001 : printf("XPC850xxZT");	break;
  case 0x21000065 : printf("XPC850xxZTA");	break;
  case 0x21010067 : printf("XPC850xxZTB");	m=1; break;
  default: printf("unknown MPC850 (0x%08x)", k);
  }
  printf(" at %s MHz:", strmhz(buf, clock));

  printf(" %u kB I-Cache", checkicache() >> 10);
  printf(" %u kB D-Cache", checkdcache() >> 10);

  /* lets check and see if we're running on a 850T (or P?) */

  immap->im_cpm.cp_fec.fec_addr_low = 0x12345678;
  if(immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) {
    printf(" FEC present");
  }

  if(!m) {
    printf("\n         * CPU Core has Silicon Bugs - Check the Errata !");
  }

  printf("\n");

  return 0;
}
#else
#error CPU undefined
#endif
/* ------------------------------------------------------------------------- */

int checkcpu(long clock)
{
  uint immr = get_immr(0);	/* Return full IMMR contents */
  uint pvr = get_pvr();

  /* 850 has PARTNUM 20 */
  /* 801 has PARTNUM 10 */
  return check_CPU(clock, pvr, immr);
}

/* ------------------------------------------------------------------------- */
/* L1 i-cache                                                                */
/* the standard 860 has 128 sets of 16 bytes in 2 ways (= 4 kB)              */
/* the 860 P (plus) has 256 sets of 16 bytes in 4 ways (= 16 kB)             */

int checkicache(void)
{
  volatile immap_t     *immap = (immap_t *)CFG_IMMR;
  volatile memctl8xx_t *memctl = &immap->im_memctl;
  u32 cacheon = rd_ic_cst() & IDC_ENABLED;
  u32 k = memctl->memc_br0 & ~0x00007fff;  /* probe in flash memoryarea */
  u32 m;
  u32 lines = -1;

  wr_ic_cst(IDC_UNALL);
  wr_ic_cst(IDC_INVALL);
  wr_ic_cst(IDC_DISABLE);
  __asm__ volatile("isync");

  while(!((m = rd_ic_cst()) & IDC_CERR2))
  {
    wr_ic_adr(k);
    wr_ic_cst(IDC_LDLCK);
    __asm__ volatile("isync");
    lines++;
    k += 0x10; /* the number of bytes in a cacheline */
  }

  wr_ic_cst(IDC_UNALL);
  wr_ic_cst(IDC_INVALL);

  if(cacheon)
    wr_ic_cst(IDC_ENABLE);
  else
    wr_ic_cst(IDC_DISABLE);

  __asm__ volatile("isync");

  return lines << 4;
};
/* ------------------------------------------------------------------------- */
/* L1 d-cache                                                                */
/* the standard 860 has 128 sets of 16 bytes in 2 ways (= 4 kB)              */
/* the 860 P (plus) has 256 sets of 16 bytes in 2 ways (= 8 kB)              */
/* call with cache disabled                                                  */

int checkdcache(void)
{
  volatile immap_t     *immap = (immap_t *)CFG_IMMR;
  volatile memctl8xx_t *memctl = &immap->im_memctl;
  u32 cacheon = rd_dc_cst() & IDC_ENABLED;
  u32 k = memctl->memc_br0 & ~0x00007fff;  /* probe in flash memoryarea */
  u32 m;
  u32 lines = -1;

  wr_dc_cst(IDC_UNALL);
  wr_dc_cst(IDC_INVALL);
  wr_dc_cst(IDC_DISABLE);

  while(!((m = rd_dc_cst()) & IDC_CERR2))
  {
    wr_dc_adr(k);
    wr_dc_cst(IDC_LDLCK);
    lines++;
    k += 0x10; /* the number of bytes in a cacheline */
  }

  wr_dc_cst(IDC_UNALL);
  wr_dc_cst(IDC_INVALL);

  if(cacheon)
    wr_dc_cst(IDC_ENABLE);
  else
    wr_dc_cst(IDC_DISABLE);

  return lines << 4;
};

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

void upmconfig(uint upm, uint *table, uint size)
{
  uint i;
  uint addr = 0;
  volatile immap_t     *immap = (immap_t *)CFG_IMMR;
  volatile memctl8xx_t *memctl = &immap->im_memctl;

  for (i = 0; i < size; i++)
  {
    memctl->memc_mdr = table[i];    /* (16-15) */
    memctl->memc_mcr = addr | upm;  /* (16-16) */
    addr++;
  }
}

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

void do_reset (cmd_tbl_t *cmdtp, bd_t *bd, int flag, int argc, char *argv[])
{
	ulong msr, addr;

	volatile immap_t *immap = (immap_t *)CFG_IMMR;

	immap->im_clkrst.car_plprcr |= PLPRCR_CSR; /* Checkstop Reset enable */

	/* Interrupts and MMU off */
	__asm__ ("mtspr    81, 0
		  mfmsr    %0": "=r"(msr) : );
	msr &= ~0x1030;
	__asm__ ("mtmsr    %0"::"r"(msr) );

	/*
	* Trying to execute the next instruction at a non-existing address
	* should cause a machine check, resulting in reset
	*/
#if 0
	addr = (ulong)-1;
#else
	/*
	 * -1 was actually a valid address on my system, so I got a
	 * Software Emulation exception instead of a Machine Check
	 * exception. Let's try to pick a better address...
	 */
	addr = CFG_MONITOR_BASE - sizeof (ulong);
#endif
	((void (*)(void ))addr)();

}

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

/*
 * Get timebase clock frequency
 *
 * See table 15-5 pp. 15-16, and SCCR[RTSEL] pp. 15-27.
 */
unsigned long get_tbclk (void)
{
	/* Pointer to initial global data area */
	init_data_t *idata=(init_data_t *)(CFG_INIT_RAM_ADDR+CFG_INIT_DATA_OFFSET);
	volatile immap_t *immr = (volatile immap_t *)CFG_IMMR;
	ulong oscclk, factor;

	if (immr->im_clkrst.car_sccr & SCCR_TBS) {
		return (idata->cpu_clk / 16);
	}

	factor = (((CFG_PLPRCR) & PLPRCR_MF_MSK) >> PLPRCR_MF_SHIFT) + 1;

	oscclk = idata->cpu_clk / factor;

	if ((immr->im_clkrst.car_sccr & SCCR_RTSEL) == 0 || factor > 2) {
		return (oscclk / 4);
	}
	return (oscclk / 16);
}

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

#if defined(CONFIG_WATCHDOG)
void
watchdog_reset(void)
{
	int re_enable = disable_interrupts();
	reset_8xx_watchdog((immap_t *)CFG_IMMR);
	if (re_enable) enable_interrupts();
}
#endif	/* CONFIG_WATCHDOG */

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