mpc8541cds.c

gumstiz u-boot loader in linux

	puts("Initializing\n");

#if defined(CONFIG_DDR_DLL)
	{
		/*
		 * Work around to stabilize DDR DLL MSYNC_IN.
		 * Errata DDR9 seems to have been fixed.
		 * This is now the workaround for Errata DDR11:
		 *    Override DLL = 1, Course Adj = 1, Tap Select = 0
		 */

		volatile ccsr_gur_t *gur= &immap->im_gur;

		gur->ddrdllcr = 0x81000000;
		asm("sync;isync;msync");
		udelay(200);
	}
#endif
	dram_size = spd_sdram();

#if defined(CONFIG_DDR_ECC) && !defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER)
	/*
	 * Initialize and enable DDR ECC.
	 */
	ddr_enable_ecc(dram_size);
#endif
	/*
	 * SDRAM Initialization
	 */
	sdram_init();

	puts("    DDR: ");
	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;
	uint temp_lbcdll;

	/*
	 * 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 |= 0x80000000;	/* DLL Bypass */

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

	} else {
		lbc->lcrr &= (~0x8000000);	/* 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");
	}
}

/*
 * Initialize SDRAM memory on the Local Bus.
 */
void
sdram_init(void)
{
#if defined(CFG_OR2_PRELIM) && defined(CFG_BR2_PRELIM)

	uint idx;
	volatile immap_t *immap = (immap_t *)CFG_IMMR;
	volatile ccsr_lbc_t *lbc = &immap->im_lbc;
	uint *sdram_addr = (uint *)CFG_LBC_SDRAM_BASE;
	uint cpu_board_rev;
	uint lsdmr_common;

	puts("    SDRAM: ");

	print_size (CFG_LBC_SDRAM_SIZE * 1024 * 1024, "\n");

	/*
	 * Setup SDRAM Base and Option Registers
	 */
	lbc->or2 = CFG_OR2_PRELIM;
	asm("msync");

	lbc->br2 = CFG_BR2_PRELIM;
	asm("msync");

	lbc->lbcr = CFG_LBC_LBCR;
	asm("msync");


	lbc->lsrt = CFG_LBC_LSRT;
	lbc->mrtpr = CFG_LBC_MRTPR;
	asm("msync");

	/*
	 * Determine which address lines to use baed on CPU board rev.
	 */
	cpu_board_rev = get_cpu_board_revision();
	lsdmr_common = CFG_LBC_LSDMR_COMMON;
	if (cpu_board_rev == MPC85XX_CPU_BOARD_REV_1_0) {
		lsdmr_common |= CFG_LBC_LSDMR_BSMA1617;
	} else if (cpu_board_rev == MPC85XX_CPU_BOARD_REV_1_1) {
		lsdmr_common |= CFG_LBC_LSDMR_BSMA1516;
	} else {
		/*
		 * Assume something unable to identify itself is
		 * really old, and likely has lines 16/17 mapped.
		 */
		lsdmr_common |= CFG_LBC_LSDMR_BSMA1617;
	}

	/*
	 * Issue PRECHARGE ALL command.
	 */
	lbc->lsdmr = lsdmr_common | CFG_LBC_LSDMR_OP_PCHALL;
	asm("sync;msync");
	*sdram_addr = 0xff;
	ppcDcbf((unsigned long) sdram_addr);
	udelay(100);

	/*
	 * Issue 8 AUTO REFRESH commands.
	 */
	for (idx = 0; idx < 8; idx++) {
		lbc->lsdmr = lsdmr_common | CFG_LBC_LSDMR_OP_ARFRSH;
		asm("sync;msync");
		*sdram_addr = 0xff;
		ppcDcbf((unsigned long) sdram_addr);
		udelay(100);
	}

	/*
	 * Issue 8 MODE-set command.
	 */
	lbc->lsdmr = lsdmr_common | CFG_LBC_LSDMR_OP_MRW;
	asm("sync;msync");
	*sdram_addr = 0xff;
	ppcDcbf((unsigned long) sdram_addr);
	udelay(100);

	/*
	 * Issue NORMAL OP command.
	 */
	lbc->lsdmr = lsdmr_common | CFG_LBC_LSDMR_OP_NORMAL;
	asm("sync;msync");
	*sdram_addr = 0xff;
	ppcDcbf((unsigned long) sdram_addr);
	udelay(200);    /* Overkill. Must wait > 200 bus cycles */

#endif	/* enable SDRAM init */
}

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

	printf("Testing DRAM from 0x%08x to 0x%08x\n",
	       CFG_MEMTEST_START,
	       CFG_MEMTEST_END);

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

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

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

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

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

#if defined(CONFIG_PCI)

/*
 * Initialize PCI Devices, report devices found.
 */

#ifndef CONFIG_PCI_PNP
static struct pci_config_table pci_mpc85xxcds_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_mpc85xxcds_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
}