barebox/arch/ppc/mach-mpc5xxx/cpu.c

/*
 * (C) Copyright 2000-2003
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * 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
 */

/*
 * CPU specific code for the MPC5xxx CPUs
 */

#include <common.h>
#include <command.h>
#include <mach/mpc5xxx.h>
#include <asm/processor.h>
#include <asm/byteorder.h>
#include <asm/io.h>
#include <init.h>
#include <types.h>
#include <mach/clocks.h>

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

int checkcpu (void)
{
	ulong clock = get_cpu_clock();
	uint svr, pvr;

	puts ("CPU:   ");

	svr = get_svr();
	pvr = get_pvr();
	switch (SVR_VER (svr)) {
	case SVR_MPC5200:
		printf ("MPC5200");
		break;
	default:
		printf ("MPC52??  (SVR %08x)", svr);
		break;
	}

	printf (" v%d.%d, Core v%d.%d", SVR_MJREV (svr), SVR_MNREV (svr),
		PVR_MAJ(pvr), PVR_MIN(pvr));
	printf (" at %ld Hz\n", clock);
	return 0;
}

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

void __noreturn reset_cpu (unsigned long addr)
{
	ulong msr;
	/* Interrupts and MMU off */
	__asm__ __volatile__ ("mfmsr    %0":"=r" (msr):);

	msr &= ~(MSR_ME | MSR_EE | MSR_IR | MSR_DR);
	__asm__ __volatile__ ("mtmsr    %0"::"r" (msr));

	/* Charge the watchdog timer */
	*(vu_long *)(MPC5XXX_GPT0_COUNTER) = 0x0001000f;
	*(vu_long *)(MPC5XXX_GPT0_ENABLE) = 0x9004; /* wden|ce|timer_ms */
	while(1);
}

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

#ifdef CONFIG_OF_FLAT_TREE
void
ft_cpu_setup(void *blob, bd_t *bd)
{
	u32 *p;
	int len;

	/* Core XLB bus frequency */
	p = ft_get_prop(blob, "/cpus/" OF_CPU "/bus-frequency", &len);
	if (p != NULL)
		*p = cpu_to_be32(get_bus_clock());

	/* SOC peripherals use the IPB bus frequency */
	p = ft_get_prop(blob, "/" OF_SOC "/bus-frequency", &len);
	if (p != NULL)
		*p = cpu_to_be32(get_ipb_clock());

	p = ft_get_prop(blob, "/" OF_SOC "/ethernet@3000/mac-address", &len);
	if (p != NULL)
		memcpy(p, bd->bi_enetaddr, 6);
}
#endif

int cpu_init_board_data(bd_t *bd)
{
	bd->bi_intfreq = get_cpu_clock();	/* Internal Freq, in Hz */
	bd->bi_busfreq = get_bus_clock();	/* Bus Freq,      in Hz */
	bd->bi_mbar_base = CFG_MBAR;		/* base of internal registers */
	bd->bi_ipbfreq = get_ipb_clock();
	bd->bi_pcifreq = get_pci_clock();
	return 0;
}

unsigned long mpc5200_get_sdram_size(unsigned int cs)
{
	unsigned long size;

	if (cs > 1)
		return 0;

	/* retrieve size of memory connected to SDRAM CS0 */
	size = *(vu_long *)(MPC5XXX_SDRAM_CS0CFG + (cs * 4)) & 0xFF;
	if (size >= 0x13)
		size = (1 << (size - 0x13)) << 20;
	else
		size = 0;

	return size;
}

struct mpc5200_cs {
	void *start;
	void *stop;
	void *cfg;
	unsigned int addecr;
};

static struct mpc5200_cs chipselects[] = {
	{
		.start = (void *)MPC5XXX_CS0_START,
		.stop = (void *)MPC5XXX_CS0_STOP,
		.cfg = (void *)MPC5XXX_CS0_CFG,
		.addecr = 1 << 16,
	}, {
		.start = (void *)MPC5XXX_CS1_START,
		.stop = (void *)MPC5XXX_CS1_STOP,
		.cfg = (void *)MPC5XXX_CS1_CFG,
		.addecr = 1 << 17,
	}, {
		.start = (void *)MPC5XXX_CS2_START,
		.stop = (void *)MPC5XXX_CS2_STOP,
		.cfg = (void *)MPC5XXX_CS2_CFG,
		.addecr = 1 << 18,
	}, {
		.start = (void *)MPC5XXX_CS3_START,
		.stop = (void *)MPC5XXX_CS3_STOP,
		.cfg = (void *)MPC5XXX_CS3_CFG,
		.addecr = 1 << 19,
	}, {
		.start = (void *)MPC5XXX_CS4_START,
		.stop = (void *)MPC5XXX_CS4_STOP,
		.cfg = (void *)MPC5XXX_CS4_CFG,
		.addecr = 1 << 20,
	}, {
		.start = (void *)MPC5XXX_CS5_START,
		.stop = (void *)MPC5XXX_CS5_STOP,
		.cfg = (void *)MPC5XXX_CS5_CFG,
		.addecr = 1 << 21,
	}, {
		.start = (void *)MPC5XXX_CS6_START,
		.stop = (void *)MPC5XXX_CS6_STOP,
		.cfg = (void *)MPC5XXX_CS6_CFG,
		.addecr = 1 << 26,
	}, {
		.start = (void *)MPC5XXX_CS7_START,
		.stop = (void *)MPC5XXX_CS7_STOP,
		.cfg = (void *)MPC5XXX_CS7_CFG,
		.addecr = 1 << 27,
	}, {
		.start = (void *)MPC5XXX_BOOTCS_START,
		.stop = (void *)MPC5XXX_BOOTCS_STOP,
		.cfg = (void *)MPC5XXX_CS0_CFG,
		.addecr = 1 << 25,
	},
};

void mpc5200_setup_cs(int cs, unsigned long start, unsigned long size, u32 cfg)
{
	u32 addecr;

	out_be32(chipselects[cs].start, START_REG(start));
	out_be32(chipselects[cs].stop, STOP_REG(start, size));
	out_be32(chipselects[cs].cfg, cfg);

	addecr = in_be32((void *)MPC5XXX_ADDECR);
	addecr |= chipselects[cs].addecr | 1;
	out_be32((void *)MPC5XXX_ADDECR, addecr);
}