u-boot/arch/powerpc/cpu/mpc8xx/cpu.c

/*
 * (C) Copyright 2000-2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/*
 * m8xx.c
 *
 * CPU specific code
 *
 * written or collected and sometimes rewritten by
 * Magnus Damm <damm@bitsmart.com>
 *
 * minor modifications by
 * Wolfgang Denk <wd@denx.de>
 */

#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <mpc8xx.h>
#include <commproc.h>
#include <netdev.h>
#include <asm/cache.h>
#include <linux/compiler.h>
#include <asm/io.h>

#if defined(CONFIG_OF_LIBFDT)
#include <libfdt.h>
#include <fdt_support.h>
#endif

DECLARE_GLOBAL_DATA_PTR;

static char *cpu_warning = "\n         " \
	"*** Warning: CPU Core has Silicon Bugs -- Check the Errata ***";

static int check_CPU (long clock, uint pvr, uint immr)
{
	char *id_str =
	NULL;
	volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000);
	uint k, m;
	char buf[32];
	char pre = 'X';
	char *mid = "xx";
	char *suf;

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

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

	k = (immr << 16) |
		immap->im_cpm.cp_dparam16[PROFF_REVNUM / sizeof(u16)];
	m = 0;
	suf = "";

	/*
	 * Some boards use sockets so different CPUs can be used.
	 * We have to check chip version in run time.
	 */
	switch (k) {
		/* MPC866P/MPC866T/MPC859T/MPC859DSL/MPC852T */
	case 0x08010004:		/* Rev. A.0 */
		suf = "A";
		/* fall through */
	case 0x08000003:		/* Rev. 0.3 */
		pre = 'M'; m = 1;
		if (id_str == NULL)
			id_str =
		"PC866x"; /* Unknown chip from MPC866 family */
		break;
	case 0x09000000: pre = 'M'; mid = suf = ""; m = 1;
		if (id_str == NULL)
			id_str = "PC885"; /* 870/875/880/885 */
		break;

	default: suf = NULL; break;
	}

	if (id_str == NULL)
		id_str = "PC86x";	/* Unknown 86x chip */
	if (suf)
		printf ("%c%s%sZPnn%s", pre, id_str, mid, suf);
	else
		printf ("unknown M%s (0x%08x)", id_str, k);

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

	print_size(checkicache(), " I-Cache ");
	print_size(checkdcache(), " D-Cache");

	/* do we have a FEC (860T/P or 852/859/866/885)? */

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

	if (!m) {
		puts (cpu_warning);
	}

	putc ('\n');

	return 0;
}

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

int checkcpu (void)
{
	ulong clock = gd->cpu_clk;
	uint immr = get_immr (0);	/* Return full IMMR contents */
	uint pvr = get_pvr ();

	puts ("CPU:   ");

	return check_CPU (clock, pvr, immr);
}

/* ------------------------------------------------------------------------- */
/* L1 i-cache                                                                */

int checkicache (void)
{
	volatile immap_t *immap = (immap_t *) CONFIG_SYS_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                                                                */
/* call with cache disabled                                                  */

int checkdcache (void)
{
	volatile immap_t *immap = (immap_t *) CONFIG_SYS_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 *) CONFIG_SYS_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++;
	}
}

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

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

	volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;

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

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

	msr &= ~0x1030;
	__asm__ volatile ("mtmsr    %0"::"r" (msr));

	/*
	 * Trying to execute the next instruction at a non-existing address
	 * should cause a machine check, resulting in reset
	 */
#ifdef CONFIG_SYS_RESET_ADDRESS
	addr = CONFIG_SYS_RESET_ADDRESS;
#else
	/*
	 * note: when CONFIG_SYS_MONITOR_BASE points to a RAM address, CONFIG_SYS_MONITOR_BASE
	 * - sizeof (ulong) is usually a valid address. Better pick an address
	 * known to be invalid on your system and assign it to CONFIG_SYS_RESET_ADDRESS.
	 * "(ulong)-1" used to be a good choice for many systems...
	 */
	addr = CONFIG_SYS_MONITOR_BASE - sizeof (ulong);
#endif
	((void (*)(void)) addr) ();
	return 1;
}

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

/*
 * Get timebase clock frequency (like cpu_clk in Hz)
 *
 * See sections 14.2 and 14.6 of the User's Manual
 */
unsigned long get_tbclk (void)
{
	uint immr = get_immr (0);	/* Return full IMMR contents */
	volatile immap_t *immap = (volatile immap_t *)(immr & 0xFFFF0000);
	ulong oscclk, factor, pll;

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

	pll = immap->im_clkrst.car_plprcr;

#define PLPRCR_val(a) ((pll & PLPRCR_ ## a ## _MSK) >> PLPRCR_ ## a ## _SHIFT)

	/*
	 * For newer PQ1 chips (MPC866/87x/88x families), PLL multiplication
	 * factor is calculated as follows:
	 *
	 *		     MFN
	 *	     MFI + -------
	 *		   MFD + 1
	 * factor =  -----------------
	 *	     (PDF + 1) * 2^S
	 *
	 */
		factor = (PLPRCR_val(MFI) + PLPRCR_val(MFN)/(PLPRCR_val(MFD)+1))/
			(PLPRCR_val(PDF)+1) / (1<<PLPRCR_val(S));

	oscclk = gd->cpu_clk / factor;

	if ((immap->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 *) CONFIG_SYS_IMMR);
	if (re_enable)
		enable_interrupts ();
}
#endif /* CONFIG_WATCHDOG */

#if defined(CONFIG_WATCHDOG)

void reset_8xx_watchdog (volatile immap_t * immr)
{
	/*
	 * All other boards use the MPC8xx Internal Watchdog
	 */
	immr->im_siu_conf.sc_swsr = 0x556c;	/* write magic1 */
	immr->im_siu_conf.sc_swsr = 0xaa39;	/* write magic2 */
}
#endif /* CONFIG_WATCHDOG */

/*
 * Initializes on-chip ethernet controllers.
 * to override, implement board_eth_init()
 */
int cpu_eth_init(bd_t *bis)
{
#if defined(FEC_ENET)
	fec_initialize(bis);
#endif
	return 0;
}