board/tqm8540/tqm8540.c

/*
 * Copyright 2005 DENX Software Engineering
 * Copyright 2004 Freescale Semiconductor.
 * (C) Copyright 2002,2003, Motorola Inc.
 * Xianghua Xiao, (X.Xiao@motorola.com)
 *
 * (C) Copyright 2002 Scott McNutt <smcnutt@artesyncp.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 <pci.h>
#include <asm/processor.h>
#include <asm/immap_85xx.h>
#include <spd.h>

#if defined(CONFIG_DDR_ECC)
extern void ddr_enable_ecc (unsigned int dram_size);
#endif

extern long int spd_sdram (void);

void local_bus_init (void);
long int fixed_sdram (void);


int board_early_init_f (void)
{
	return 0;
}

int checkboard (void)
{
	puts ("Board: TQM8540\n");

#ifdef CONFIG_PCI
	printf ("PCI1:  32 bit, %d MHz (compiled)\n",
		CONFIG_SYS_CLK_FREQ / 1000000);
#else
	printf ("PCI1:  disabled\n");
#endif
	/*
	 * Initialize local bus.
	 */
	local_bus_init ();

	return 0;
}


long int initdram (int board_type)
{
	long dram_size = 0;
	extern long spd_sdram (void);
	volatile immap_t *immap = (immap_t *) CFG_IMMR;

#if defined(CONFIG_DDR_DLL)
	{
		volatile ccsr_gur_t *gur= &immap->im_gur;
		int i,x;

		x = 10;

		/*
		 * Work around to stabilize DDR DLL
		 */
		gur->ddrdllcr = 0x81000000;
		asm("sync;isync;msync");
		udelay (200);
		while (gur->ddrdllcr != 0x81000100) {
			gur->devdisr = gur->devdisr | 0x00010000;
			asm("sync;isync;msync");
			for (i=0; i<x; i++)
				;
			gur->devdisr = gur->devdisr & 0xfff7ffff;
			asm("sync;isync;msync");
			x++;
		}
	}
#endif

#if defined(CONFIG_SPD_EEPROM)
	dram_size = spd_sdram ();
#else
	dram_size = fixed_sdram ();
#endif

#if defined(CONFIG_DDR_ECC)
	/*
	 * Initialize and enable DDR ECC.
	 */
	ddr_enable_ecc (dram_size);
#endif

	return dram_size;
}


/*
 * Initialize Local Bus
 */

void local_bus_init (void)
{
	volatile immap_t *immap = (immap_t *) CFG_IMMR;
	volatile ccsr_gur_t *gur = &immap->im_gur;
	volatile ccsr_lbc_t *lbc = &immap->im_lbc;

	uint clkdiv;
	uint lbc_hz;
	sys_info_t sysinfo;

	/*
	 * Errata LBC11.
	 * Fix Local Bus clock glitch when DLL is enabled.
	 *
	 * If localbus freq is < 66Mhz, DLL bypass mode must be used.
	 * If localbus freq is > 133Mhz, DLL can be safely enabled.
	 * Between 66 and 133, the DLL is enabled with an override workaround.
	 */

	get_sys_info (&sysinfo);
	clkdiv = lbc->lcrr & 0x0f;
	lbc_hz = sysinfo.freqSystemBus / 1000000 / clkdiv;

	if (lbc_hz < 66) {
		lbc->lcrr = CFG_LBC_LCRR | 0x80000000;	/* DLL Bypass */
		lbc->ltedr = 0xa4c80000;	/* DK: !!! */

	} else if (lbc_hz >= 133) {
		lbc->lcrr = CFG_LBC_LCRR & (~0x80000000);	/* DLL Enabled */

	} else {
		/*
		 * On REV1 boards, need to change CLKDIV before enable DLL.
		 * Default CLKDIV is 8, change it to 4 temporarily.
		 */
		uint pvr = get_pvr ();
		uint temp_lbcdll = 0;

		if (pvr == PVR_85xx_REV1) {
			/* FIXME: Justify the high bit here. */
			lbc->lcrr = 0x10000004;
		}

		lbc->lcrr = CFG_LBC_LCRR & (~0x80000000);	/* DLL Enabled */
		udelay (200);

		/*
		 * Sample LBC DLL ctrl reg, upshift it to set the
		 * override bits.
		 */
		temp_lbcdll = gur->lbcdllcr;
		gur->lbcdllcr = (((temp_lbcdll & 0xff) << 16) | 0x80000000);
		asm ("sync;isync;msync");
	}
}


#if defined(CFG_DRAM_TEST)
int testdram (void)
{
	uint *pstart = (uint *) CFG_MEMTEST_START;
	uint *pend = (uint *) CFG_MEMTEST_END;
	uint *p;

	printf ("SDRAM test phase 1:\n");
	for (p = pstart; p < pend; p++)
		*p = 0xaaaaaaaa;

	for (p = pstart; p < pend; p++) {
		if (*p != 0xaaaaaaaa) {
			printf ("SDRAM test fails at: %08x\n", (uint) p);
			return 1;
		}
	}

	printf ("SDRAM test phase 2:\n");
	for (p = pstart; p < pend; p++)
		*p = 0x55555555;

	for (p = pstart; p < pend; p++) {
		if (*p != 0x55555555) {
			printf ("SDRAM test fails at: %08x\n", (uint) p);
			return 1;
		}
	}

	printf ("SDRAM test passed.\n");
	return 0;
}
#endif


#if !defined(CONFIG_SPD_EEPROM)
/*************************************************************************
 *  fixed sdram init -- doesn't use serial presence detect.
 ************************************************************************/
long int fixed_sdram (void)
{
#ifndef CFG_RAMBOOT
	volatile immap_t *immap = (immap_t *) CFG_IMMR;
	volatile ccsr_ddr_t *ddr = &immap->im_ddr;

	ddr->cs0_bnds = CFG_DDR_CS0_BNDS;
	ddr->cs0_config = CFG_DDR_CS0_CONFIG;
	ddr->timing_cfg_1 = CFG_DDR_TIMING_1;
	ddr->timing_cfg_2 = CFG_DDR_TIMING_2;
	ddr->sdram_mode = CFG_DDR_MODE;
	ddr->sdram_interval = CFG_DDR_INTERVAL;
	ddr->err_disable = 0x0000000D;
#if defined (CONFIG_DDR_ECC)
	ddr->err_disable = 0x0000000D;
	ddr->err_sbe = 0x00ff0000;
#endif
	asm ("sync;isync;msync");
	udelay (500);
#if defined (CONFIG_DDR_ECC)
	/* Enable ECC checking */
	ddr->sdram_cfg = (CFG_DDR_CONTROL | 0x20000000);
#else
	ddr->sdram_cfg = CFG_DDR_CONTROL;
#endif
	asm ("sync; isync; msync");
	udelay (500);
#endif
	return get_ram_size (0, CFG_SDRAM_SIZE * 1024 * 1024);
}
#endif /* !defined(CONFIG_SPD_EEPROM) */


#if defined(CONFIG_PCI)
/*
 * Initialize PCI Devices, report devices found.
 */

#ifndef CONFIG_PCI_PNP
static struct pci_config_table pci_mpc85xxads_config_table[] = {
	{PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
	 PCI_IDSEL_NUMBER, PCI_ANY_ID,
	 pci_cfgfunc_config_device, {PCI_ENET0_IOADDR,
				     PCI_ENET0_MEMADDR,
				     PCI_COMMAND_MEMORY |
				     PCI_COMMAND_MASTER}},
	{}
};
#endif


static struct pci_controller hose = {
#ifndef CONFIG_PCI_PNP
	config_table:pci_mpc85xxads_config_table,
#endif
};

#endif /* CONFIG_PCI */


void pci_init_board (void)
{
#ifdef CONFIG_PCI
	extern void pci_mpc85xx_init (struct pci_controller *hose);

	pci_mpc85xx_init (&hose);
#endif /* CONFIG_PCI */
}