cpu/i386/sc520.c - filogic/uboot - Gitiles

 /*
  * (C) Copyright 2002
  * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
  *
  * 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
  */

 /* stuff specific for the sc520,
  * but idependent of implementation */

 #include <config.h>

 #ifdef CONFIG_SC520

 #include <common.h>
 #include <config.h>
 #include <pci.h>
 #include <ssi.h>
 #include <asm/io.h>
 #include <asm/pci.h>
 #include <asm/ic/sc520.h>

 /*
  * utility functions for boards based on the AMD sc520
  *
  * void write_mmcr_byte(u16 mmcr, u8 data)
  * void write_mmcr_word(u16 mmcr, u16 data)
  * void write_mmcr_long(u16 mmcr, u32 data)
  *
  * u8   read_mmcr_byte(u16 mmcr)
  * u16  read_mmcr_word(u16 mmcr)
  * u32  read_mmcr_long(u16 mmcr)
  *
  * void init_sc520(void)
  * unsigned long init_sc520_dram(void)
  * void pci_sc520_init(struct pci_controller *hose)
  *
  * void reset_timer(void)
  * ulong get_timer(ulong base)
  * void set_timer(ulong t)
  * void udelay(unsigned long usec)
  *
  */

 static u32 mmcr_base= 0xfffef000;

 void write_mmcr_byte(u16 mmcr, u8 data)
 {
 	writeb(data, mmcr+mmcr_base);
 }

 void write_mmcr_word(u16 mmcr, u16 data)
 {
 	writew(data, mmcr+mmcr_base);
 }

 void write_mmcr_long(u16 mmcr, u32 data)
 {
 	writel(data, mmcr+mmcr_base);
 }

 u8 read_mmcr_byte(u16 mmcr)
 {
 	return readb(mmcr+mmcr_base);
 }

 u16 read_mmcr_word(u16 mmcr)
 {
 	return readw(mmcr+mmcr_base);
 }

 u32 read_mmcr_long(u16 mmcr)
 {
 	return readl(mmcr+mmcr_base);
 }


 void init_sc520(void)
 {
 	DECLARE_GLOBAL_DATA_PTR;

 	/* Set the UARTxCTL register at it's slower,
 	 * baud clock giving us a 1.8432 MHz reference
 	 */
 	write_mmcr_byte(SC520_UART1CTL, 7);
 	write_mmcr_byte(SC520_UART2CTL, 7);

 	/* first set the timer pin mapping */
 	write_mmcr_byte(SC520_CLKSEL, 0x72);	/* no clock frequency selected, use 1.1892MHz */

 	/* enable PCI bus arbitrer */
 	write_mmcr_byte(SC520_SYSARBCTL,0x02);  /* enable concurrent mode */

 	write_mmcr_word(SC520_SYSARBMENB,0x1f); /* enable external grants */
 	write_mmcr_word(SC520_HBCTL,0x04);      /* enable posted-writes */


 	if (CFG_SC520_HIGH_SPEED) {
 		write_mmcr_byte(SC520_CPUCTL, 0x2);	/* set it to 133 MHz and write back */
 		gd->cpu_clk = 133000000;
 		printf("## CPU Speed set to 133MHz\n");
 	} else {
 		write_mmcr_byte(SC520_CPUCTL, 1);	/* set CPU to 100 MHz and write back cache */
 		printf("## CPU Speed set to 100MHz\n");
 		gd->cpu_clk = 100000000;
 	}


 	/* wait at least one millisecond */
         asm("movl	$0x2000,%%ecx\n"
 	    "wait_loop:	pushl %%ecx\n"
 	    "popl	%%ecx\n"
 	    "loop wait_loop\n": : : "ecx");

 	/* turn on the SDRAM write buffer */
 	write_mmcr_byte(SC520_DBCTL, 0x11);

 	/* turn on the cache and disable write through */
 	asm("movl	%%cr0, %%eax\n"
 	    "andl	$0x9fffffff, %%eax\n"
 	    "movl	%%eax, %%cr0\n"  : : : "eax");
 }

 unsigned long init_sc520_dram(void)
 {
 	DECLARE_GLOBAL_DATA_PTR;
 	bd_t *bd = gd->bd;

 	u32 dram_present=0;
 	u32 dram_ctrl;

 	int val;

 	int cas_precharge_delay = CFG_SDRAM_PRECHARGE_DELAY;
 	int refresh_rate        = CFG_SDRAM_REFRESH_RATE;
 	int ras_cas_delay       = CFG_SDRAM_RAS_CAS_DELAY;

 	/* set SDRAM speed here */

 	refresh_rate/=78;
 	if (refresh_rate<=1) {
 		val = 0;  /* 7.8us */
 	} else if (refresh_rate==2) {
 		val = 1;  /* 15.6us */
 	} else if (refresh_rate==3 || refresh_rate==4) {
 		val = 2;  /* 31.2us */
 	} else {
 		val = 3;  /* 62.4us */
 	}
 	write_mmcr_byte(SC520_DRCCTL, (read_mmcr_byte(SC520_DRCCTL) & 0xcf) | (val<<4));

 	val = read_mmcr_byte(SC520_DRCTMCTL);
 	val &= 0xf0;

 	if (cas_precharge_delay==3) {
 		val |= 0x04;   /* 3T */
 	} else if (cas_precharge_delay==4) {
 		val |= 0x08;   /* 4T */
 	} else if (cas_precharge_delay>4) {
 		val |= 0x0c;
 	}

 	if (ras_cas_delay > 3) {
 		val |= 2;
 	} else {
 		val |= 1;
 	}
 	write_mmcr_byte(SC520_DRCTMCTL, val);


 	/* We read-back the configuration of the dram
 	 * controller that the assembly code wrote */
 	dram_ctrl = read_mmcr_long(SC520_DRCBENDADR);


 	bd->bi_dram[0].start = 0;
 	if (dram_ctrl & 0x80) {
 		/* bank 0 enabled */
 		dram_present = bd->bi_dram[1].start = (dram_ctrl & 0x7f) << 22;
 		bd->bi_dram[0].size = bd->bi_dram[1].start;

 	} else {
 		bd->bi_dram[0].size = 0;
 		bd->bi_dram[1].start = bd->bi_dram[0].start;
 	}

 	if (dram_ctrl & 0x8000) {
 		/* bank 1 enabled */
 		dram_present = bd->bi_dram[2].start = (dram_ctrl & 0x7f00) << 14;
 		bd->bi_dram[1].size = bd->bi_dram[2].start -  bd->bi_dram[1].start;
 	} else {
 		bd->bi_dram[1].size = 0;
 		bd->bi_dram[2].start = bd->bi_dram[1].start;
 	}

 	if (dram_ctrl & 0x800000) {
 		/* bank 2 enabled */
 		dram_present = bd->bi_dram[3].start = (dram_ctrl & 0x7f0000) << 6;
 		bd->bi_dram[2].size = bd->bi_dram[3].start -  bd->bi_dram[2].start;
 	} else {
 		bd->bi_dram[2].size = 0;
 		bd->bi_dram[3].start = bd->bi_dram[2].start;
 	}

 	if (dram_ctrl & 0x80000000) {
 		/* bank 3 enabled */
 		dram_present  = (dram_ctrl & 0x7f000000) >> 2;
 		bd->bi_dram[3].size = dram_present -  bd->bi_dram[3].start;
 	} else {
 		bd->bi_dram[3].size = 0;
 	}


 #if 0
 	printf("Configured %d bytes of dram\n", dram_present);
 #endif
 	gd->ram_size = dram_present;

 	return dram_present;
 }


 #ifdef CONFIG_PCI


 static struct {
 	u8 priority;
 	u16 level_reg;
 	u8 level_bit;
 } sc520_irq[] = {
 	{ SC520_IRQ0,  SC520_MPICMODE,  0x01 },
 	{ SC520_IRQ1,  SC520_MPICMODE,  0x02 },
 	{ SC520_IRQ2,  SC520_SL1PICMODE, 0x02 },
 	{ SC520_IRQ3,  SC520_MPICMODE,  0x08 },
 	{ SC520_IRQ4,  SC520_MPICMODE,  0x10 },
 	{ SC520_IRQ5,  SC520_MPICMODE,  0x20 },
 	{ SC520_IRQ6,  SC520_MPICMODE,  0x40 },
 	{ SC520_IRQ7,  SC520_MPICMODE,  0x80 },

 	{ SC520_IRQ8,  SC520_SL1PICMODE, 0x01 },
 	{ SC520_IRQ9,  SC520_SL1PICMODE, 0x02 },
 	{ SC520_IRQ10, SC520_SL1PICMODE, 0x04 },
 	{ SC520_IRQ11, SC520_SL1PICMODE, 0x08 },
 	{ SC520_IRQ12, SC520_SL1PICMODE, 0x10 },
 	{ SC520_IRQ13, SC520_SL1PICMODE, 0x20 },
 	{ SC520_IRQ14, SC520_SL1PICMODE, 0x40 },
 	{ SC520_IRQ15, SC520_SL1PICMODE, 0x80 }
 };


 /* The interrupt used for PCI INTA-INTD  */
 int sc520_pci_ints[15] = {
 	-1, -1, -1, -1, -1, -1, -1, -1,
 		-1, -1, -1, -1, -1, -1, -1
 };

 /* utility function to configure a pci interrupt */
 int pci_sc520_set_irq(int pci_pin, int irq)
 {
 	int i;

 # if 0
 	printf("set_irq(): map INT%c to IRQ%d\n", pci_pin + 'A', irq);
 #endif
 	if (irq < 0 || irq > 15) {
 		return -1; /* illegal irq */
 	}

 	if (pci_pin < 0 || pci_pin > 15) {
 		return -1; /* illegal pci int pin */
 	}

 	/* first disable any non-pci interrupt source that use
 	 * this level */
 	for (i=SC520_GPTMR0MAP;i<=SC520_GP10IMAP;i++) {
 		if (i>=SC520_PCIINTAMAP&&i<=SC520_PCIINTDMAP) {
 			continue;
 		}
 		if (read_mmcr_byte(i) == sc520_irq[irq].priority) {
 			write_mmcr_byte(i, SC520_IRQ_DISABLED);
 		}
 	}

 	/* Set the trigger to level */
 	write_mmcr_byte(sc520_irq[irq].level_reg,
 			read_mmcr_byte(sc520_irq[irq].level_reg) | sc520_irq[irq].level_bit);


 	if (pci_pin < 4) {
 		/* PCI INTA-INTD */
 		/* route the interrupt */
 		write_mmcr_byte(SC520_PCIINTAMAP + pci_pin, sc520_irq[irq].priority);


 	} else {
 		/* GPIRQ0-GPIRQ10 used for additional PCI INTS */
 		write_mmcr_byte(SC520_GP0IMAP + pci_pin - 4, sc520_irq[irq].priority);

 		/* also set the polarity in this case */
 		write_mmcr_word(SC520_INTPINPOL,
 				read_mmcr_word(SC520_INTPINPOL) | (1 << (pci_pin-4)));

 	}

 	/* register the pin */
 	sc520_pci_ints[pci_pin] = irq;


 	return 0; /* OK */
 }

 void pci_sc520_init(struct pci_controller *hose)
 {
 	hose->first_busno = 0;
 	hose->last_busno = 0xff;

 	/* System memory space */
 	pci_set_region(hose->regions + 0,
 		       SC520_PCI_MEMORY_BUS,
 		       SC520_PCI_MEMORY_PHYS,
 		       SC520_PCI_MEMORY_SIZE,
 		       PCI_REGION_MEM | PCI_REGION_MEMORY);

 	/* PCI memory space */
 	pci_set_region(hose->regions + 1,
 		       SC520_PCI_MEM_BUS,
 		       SC520_PCI_MEM_PHYS,
 		       SC520_PCI_MEM_SIZE,
 		       PCI_REGION_MEM);

 	/* ISA/PCI memory space */
 	pci_set_region(hose->regions + 2,
 		       SC520_ISA_MEM_BUS,
 		       SC520_ISA_MEM_PHYS,
 		       SC520_ISA_MEM_SIZE,
 		       PCI_REGION_MEM);

 	/* PCI I/O space */
 	pci_set_region(hose->regions + 3,
 		       SC520_PCI_IO_BUS,
 		       SC520_PCI_IO_PHYS,
 		       SC520_PCI_IO_SIZE,
 		       PCI_REGION_IO);

 	/* ISA/PCI I/O space */
 	pci_set_region(hose->regions + 4,
 		       SC520_ISA_IO_BUS,
 		       SC520_ISA_IO_PHYS,
 		       SC520_ISA_IO_SIZE,
 		       PCI_REGION_IO);

 	hose->region_count = 5;

 	pci_setup_type1(hose,
 			SC520_REG_ADDR,
 			SC520_REG_DATA);

 	pci_register_hose(hose);

 	hose->last_busno = pci_hose_scan(hose);

 	/* enable target memory acceses on host brige */
 	pci_write_config_word(0, PCI_COMMAND,
 			      PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);

 }


 #endif

 #ifdef CFG_TIMER_SC520


 void reset_timer(void)
 {
 	write_mmcr_word(SC520_GPTMR0CNT, 0);
 	write_mmcr_word(SC520_GPTMR0CTL, 0x6001);

 }

 ulong get_timer(ulong base)
 {
 	/* fixme: 30 or 33 */
 	return 	read_mmcr_word(SC520_GPTMR0CNT) / 33;
 }

 void set_timer(ulong t)
 {
 	/* FixMe: use two cascade coupled timers */
 	write_mmcr_word(SC520_GPTMR0CTL, 0x4001);
 	write_mmcr_word(SC520_GPTMR0CNT, t*33);
 	write_mmcr_word(SC520_GPTMR0CTL, 0x6001);
 }


 void udelay(unsigned long usec)
 {
 	int m=0;
 	long u;

 	read_mmcr_word(SC520_SWTMRMILLI);
 	read_mmcr_word(SC520_SWTMRMICRO);

 #if 0
 	/* do not enable this line, udelay is used in the serial driver -> recursion */
 	printf("udelay: %ld m.u %d.%d  tm.tu %d.%d\n", usec, m, u, tm, tu);
 #endif
 	while (1) {

 		m += read_mmcr_word(SC520_SWTMRMILLI);
 		u = read_mmcr_word(SC520_SWTMRMICRO) + (m * 1000);

 		if (usec <= u) {
 			break;
 		}
 	}
 }

 #endif

 int ssi_set_interface(int freq, int lsb_first, int inv_clock, int inv_phase)
 {
 	u8 temp=0;

 	if (freq >= 8192) {
 		temp |= CTL_CLK_SEL_4;
 	} else if (freq >= 4096) {
 		temp |= CTL_CLK_SEL_8;
 	} else if (freq >= 2048) {
 		temp |= CTL_CLK_SEL_16;
 	} else if (freq >= 1024) {
 		temp |= CTL_CLK_SEL_32;
 	} else if (freq >= 512) {
 		temp |= CTL_CLK_SEL_64;
 	} else if (freq >= 256) {
 		temp |= CTL_CLK_SEL_128;
 	} else if (freq >= 128) {
 		temp |= CTL_CLK_SEL_256;
 	} else {
 		temp |= CTL_CLK_SEL_512;
 	}

 	if (!lsb_first) {
 		temp |= MSBF_ENB;
 	}

 	if (inv_clock) {
 		temp |= CLK_INV_ENB;
 	}

 	if (inv_phase) {
 		temp |= PHS_INV_ENB;
 	}

 	write_mmcr_byte(SC520_SSICTL, temp);

 	return 0;
 }

 u8 ssi_txrx_byte(u8 data)
 {
 	write_mmcr_byte(SC520_SSIXMIT, data);
 	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
 	write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_XMITRCV);
 	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
 	return read_mmcr_byte(SC520_SSIRCV);
 }


 void ssi_tx_byte(u8 data)
 {
 	write_mmcr_byte(SC520_SSIXMIT, data);
 	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
 	write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_XMIT);
 }

 u8 ssi_rx_byte(void)
 {
 	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
 	write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_RCV);
 	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
 	return read_mmcr_byte(SC520_SSIRCV);
 }

 #endif /* CONFIG_SC520 */
	/*
	* (C) Copyright 2002
	* Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
	*
	* 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
	*/

	/* stuff specific for the sc520,
	* but idependent of implementation */

	#include <config.h>

	#ifdef CONFIG_SC520

	#include <common.h>
	#include <config.h>
	#include <pci.h>
	#include <ssi.h>
	#include <asm/io.h>
	#include <asm/pci.h>
	#include <asm/ic/sc520.h>

	/*
	* utility functions for boards based on the AMD sc520
	*
	* void write_mmcr_byte(u16 mmcr, u8 data)
	* void write_mmcr_word(u16 mmcr, u16 data)
	* void write_mmcr_long(u16 mmcr, u32 data)
	*
	* u8 read_mmcr_byte(u16 mmcr)
	* u16 read_mmcr_word(u16 mmcr)
	* u32 read_mmcr_long(u16 mmcr)
	*
	* void init_sc520(void)
	* unsigned long init_sc520_dram(void)
	* void pci_sc520_init(struct pci_controller *hose)
	*
	* void reset_timer(void)
	* ulong get_timer(ulong base)
	* void set_timer(ulong t)
	* void udelay(unsigned long usec)
	*
	*/

	static u32 mmcr_base= 0xfffef000;

	void write_mmcr_byte(u16 mmcr, u8 data)
	{
	writeb(data, mmcr+mmcr_base);
	}

	void write_mmcr_word(u16 mmcr, u16 data)
	{
	writew(data, mmcr+mmcr_base);
	}

	void write_mmcr_long(u16 mmcr, u32 data)
	{
	writel(data, mmcr+mmcr_base);
	}

	u8 read_mmcr_byte(u16 mmcr)
	{
	return readb(mmcr+mmcr_base);
	}

	u16 read_mmcr_word(u16 mmcr)
	{
	return readw(mmcr+mmcr_base);
	}

	u32 read_mmcr_long(u16 mmcr)
	{
	return readl(mmcr+mmcr_base);
	}


	void init_sc520(void)
	{
	DECLARE_GLOBAL_DATA_PTR;

	/* Set the UARTxCTL register at it's slower,
	* baud clock giving us a 1.8432 MHz reference
	*/
	write_mmcr_byte(SC520_UART1CTL, 7);
	write_mmcr_byte(SC520_UART2CTL, 7);

	/* first set the timer pin mapping */
	write_mmcr_byte(SC520_CLKSEL, 0x72); /* no clock frequency selected, use 1.1892MHz */

	/* enable PCI bus arbitrer */
	write_mmcr_byte(SC520_SYSARBCTL,0x02); /* enable concurrent mode */

	write_mmcr_word(SC520_SYSARBMENB,0x1f); /* enable external grants */
	write_mmcr_word(SC520_HBCTL,0x04); /* enable posted-writes */


	if (CFG_SC520_HIGH_SPEED) {
	write_mmcr_byte(SC520_CPUCTL, 0x2); /* set it to 133 MHz and write back */
	gd->cpu_clk = 133000000;
	printf("## CPU Speed set to 133MHz\n");
	} else {
	write_mmcr_byte(SC520_CPUCTL, 1); /* set CPU to 100 MHz and write back cache */
	printf("## CPU Speed set to 100MHz\n");
	gd->cpu_clk = 100000000;
	}


	/* wait at least one millisecond */
	asm("movl $0x2000,%%ecx\n"
	"wait_loop: pushl %%ecx\n"
	"popl %%ecx\n"
	"loop wait_loop\n": : : "ecx");

	/* turn on the SDRAM write buffer */
	write_mmcr_byte(SC520_DBCTL, 0x11);

	/* turn on the cache and disable write through */
	asm("movl %%cr0, %%eax\n"
	"andl $0x9fffffff, %%eax\n"
	"movl %%eax, %%cr0\n" : : : "eax");
	}

	unsigned long init_sc520_dram(void)
	{
	DECLARE_GLOBAL_DATA_PTR;
	bd_t *bd = gd->bd;

	u32 dram_present=0;
	u32 dram_ctrl;

	int val;

	int cas_precharge_delay = CFG_SDRAM_PRECHARGE_DELAY;
	int refresh_rate = CFG_SDRAM_REFRESH_RATE;
	int ras_cas_delay = CFG_SDRAM_RAS_CAS_DELAY;

	/* set SDRAM speed here */

	refresh_rate/=78;
	if (refresh_rate<=1) {
	val = 0; /* 7.8us */
	} else if (refresh_rate==2) {
	val = 1; /* 15.6us */
	} else if (refresh_rate==3 \|\| refresh_rate==4) {
	val = 2; /* 31.2us */
	} else {
	val = 3; /* 62.4us */
	}
	write_mmcr_byte(SC520_DRCCTL, (read_mmcr_byte(SC520_DRCCTL) & 0xcf) \| (val<<4));

	val = read_mmcr_byte(SC520_DRCTMCTL);
	val &= 0xf0;

	if (cas_precharge_delay==3) {
	val \|= 0x04; /* 3T */
	} else if (cas_precharge_delay==4) {
	val \|= 0x08; /* 4T */
	} else if (cas_precharge_delay>4) {
	val \|= 0x0c;
	}

	if (ras_cas_delay > 3) {
	val \|= 2;
	} else {
	val \|= 1;
	}
	write_mmcr_byte(SC520_DRCTMCTL, val);


	/* We read-back the configuration of the dram
	* controller that the assembly code wrote */
	dram_ctrl = read_mmcr_long(SC520_DRCBENDADR);


	bd->bi_dram[0].start = 0;
	if (dram_ctrl & 0x80) {
	/* bank 0 enabled */
	dram_present = bd->bi_dram[1].start = (dram_ctrl & 0x7f) << 22;
	bd->bi_dram[0].size = bd->bi_dram[1].start;

	} else {
	bd->bi_dram[0].size = 0;
	bd->bi_dram[1].start = bd->bi_dram[0].start;
	}

	if (dram_ctrl & 0x8000) {
	/* bank 1 enabled */
	dram_present = bd->bi_dram[2].start = (dram_ctrl & 0x7f00) << 14;
	bd->bi_dram[1].size = bd->bi_dram[2].start - bd->bi_dram[1].start;
	} else {
	bd->bi_dram[1].size = 0;
	bd->bi_dram[2].start = bd->bi_dram[1].start;
	}

	if (dram_ctrl & 0x800000) {
	/* bank 2 enabled */
	dram_present = bd->bi_dram[3].start = (dram_ctrl & 0x7f0000) << 6;
	bd->bi_dram[2].size = bd->bi_dram[3].start - bd->bi_dram[2].start;
	} else {
	bd->bi_dram[2].size = 0;
	bd->bi_dram[3].start = bd->bi_dram[2].start;
	}

	if (dram_ctrl & 0x80000000) {
	/* bank 3 enabled */
	dram_present = (dram_ctrl & 0x7f000000) >> 2;
	bd->bi_dram[3].size = dram_present - bd->bi_dram[3].start;
	} else {
	bd->bi_dram[3].size = 0;
	}


	#if 0
	printf("Configured %d bytes of dram\n", dram_present);
	#endif
	gd->ram_size = dram_present;

	return dram_present;
	}


	#ifdef CONFIG_PCI


	static struct {
	u8 priority;
	u16 level_reg;
	u8 level_bit;
	} sc520_irq[] = {
	{ SC520_IRQ0, SC520_MPICMODE, 0x01 },
	{ SC520_IRQ1, SC520_MPICMODE, 0x02 },
	{ SC520_IRQ2, SC520_SL1PICMODE, 0x02 },
	{ SC520_IRQ3, SC520_MPICMODE, 0x08 },
	{ SC520_IRQ4, SC520_MPICMODE, 0x10 },
	{ SC520_IRQ5, SC520_MPICMODE, 0x20 },
	{ SC520_IRQ6, SC520_MPICMODE, 0x40 },
	{ SC520_IRQ7, SC520_MPICMODE, 0x80 },

	{ SC520_IRQ8, SC520_SL1PICMODE, 0x01 },
	{ SC520_IRQ9, SC520_SL1PICMODE, 0x02 },
	{ SC520_IRQ10, SC520_SL1PICMODE, 0x04 },
	{ SC520_IRQ11, SC520_SL1PICMODE, 0x08 },
	{ SC520_IRQ12, SC520_SL1PICMODE, 0x10 },
	{ SC520_IRQ13, SC520_SL1PICMODE, 0x20 },
	{ SC520_IRQ14, SC520_SL1PICMODE, 0x40 },
	{ SC520_IRQ15, SC520_SL1PICMODE, 0x80 }
	};


	/* The interrupt used for PCI INTA-INTD */
	int sc520_pci_ints[15] = {
	-1, -1, -1, -1, -1, -1, -1, -1,
	-1, -1, -1, -1, -1, -1, -1
	};

	/* utility function to configure a pci interrupt */
	int pci_sc520_set_irq(int pci_pin, int irq)
	{
	int i;

	# if 0
	printf("set_irq(): map INT%c to IRQ%d\n", pci_pin + 'A', irq);
	#endif
	if (irq < 0 \|\| irq > 15) {
	return -1; /* illegal irq */
	}

	if (pci_pin < 0 \|\| pci_pin > 15) {
	return -1; /* illegal pci int pin */
	}

	/* first disable any non-pci interrupt source that use
	* this level */
	for (i=SC520_GPTMR0MAP;i<=SC520_GP10IMAP;i++) {
	if (i>=SC520_PCIINTAMAP&&i<=SC520_PCIINTDMAP) {
	continue;
	}
	if (read_mmcr_byte(i) == sc520_irq[irq].priority) {
	write_mmcr_byte(i, SC520_IRQ_DISABLED);
	}
	}

	/* Set the trigger to level */
	write_mmcr_byte(sc520_irq[irq].level_reg,
	read_mmcr_byte(sc520_irq[irq].level_reg) \| sc520_irq[irq].level_bit);


	if (pci_pin < 4) {
	/* PCI INTA-INTD */
	/* route the interrupt */
	write_mmcr_byte(SC520_PCIINTAMAP + pci_pin, sc520_irq[irq].priority);


	} else {
	/* GPIRQ0-GPIRQ10 used for additional PCI INTS */
	write_mmcr_byte(SC520_GP0IMAP + pci_pin - 4, sc520_irq[irq].priority);

	/* also set the polarity in this case */
	write_mmcr_word(SC520_INTPINPOL,
	read_mmcr_word(SC520_INTPINPOL) \| (1 << (pci_pin-4)));

	}

	/* register the pin */
	sc520_pci_ints[pci_pin] = irq;


	return 0; /* OK */
	}

	void pci_sc520_init(struct pci_controller *hose)
	{
	hose->first_busno = 0;
	hose->last_busno = 0xff;

	/* System memory space */
	pci_set_region(hose->regions + 0,
	SC520_PCI_MEMORY_BUS,
	SC520_PCI_MEMORY_PHYS,
	SC520_PCI_MEMORY_SIZE,
	PCI_REGION_MEM \| PCI_REGION_MEMORY);

	/* PCI memory space */
	pci_set_region(hose->regions + 1,
	SC520_PCI_MEM_BUS,
	SC520_PCI_MEM_PHYS,
	SC520_PCI_MEM_SIZE,
	PCI_REGION_MEM);

	/* ISA/PCI memory space */
	pci_set_region(hose->regions + 2,
	SC520_ISA_MEM_BUS,
	SC520_ISA_MEM_PHYS,
	SC520_ISA_MEM_SIZE,
	PCI_REGION_MEM);

	/* PCI I/O space */
	pci_set_region(hose->regions + 3,
	SC520_PCI_IO_BUS,
	SC520_PCI_IO_PHYS,
	SC520_PCI_IO_SIZE,
	PCI_REGION_IO);

	/* ISA/PCI I/O space */
	pci_set_region(hose->regions + 4,
	SC520_ISA_IO_BUS,
	SC520_ISA_IO_PHYS,
	SC520_ISA_IO_SIZE,
	PCI_REGION_IO);

	hose->region_count = 5;

	pci_setup_type1(hose,
	SC520_REG_ADDR,
	SC520_REG_DATA);

	pci_register_hose(hose);

	hose->last_busno = pci_hose_scan(hose);

	/* enable target memory acceses on host brige */
	pci_write_config_word(0, PCI_COMMAND,
	PCI_COMMAND_MEMORY \| PCI_COMMAND_MASTER);

	}



	#endif

	#ifdef CFG_TIMER_SC520


	void reset_timer(void)
	{
	write_mmcr_word(SC520_GPTMR0CNT, 0);
	write_mmcr_word(SC520_GPTMR0CTL, 0x6001);

	}

	ulong get_timer(ulong base)
	{
	/* fixme: 30 or 33 */
	return read_mmcr_word(SC520_GPTMR0CNT) / 33;
	}

	void set_timer(ulong t)
	{
	/* FixMe: use two cascade coupled timers */
	write_mmcr_word(SC520_GPTMR0CTL, 0x4001);
	write_mmcr_word(SC520_GPTMR0CNT, t*33);
	write_mmcr_word(SC520_GPTMR0CTL, 0x6001);
	}


	void udelay(unsigned long usec)
	{
	int m=0;
	long u;

	read_mmcr_word(SC520_SWTMRMILLI);
	read_mmcr_word(SC520_SWTMRMICRO);

	#if 0
	/* do not enable this line, udelay is used in the serial driver -> recursion */
	printf("udelay: %ld m.u %d.%d tm.tu %d.%d\n", usec, m, u, tm, tu);
	#endif
	while (1) {

	m += read_mmcr_word(SC520_SWTMRMILLI);
	u = read_mmcr_word(SC520_SWTMRMICRO) + (m * 1000);

	if (usec <= u) {
	break;
	}
	}
	}

	#endif

	int ssi_set_interface(int freq, int lsb_first, int inv_clock, int inv_phase)
	{
	u8 temp=0;

	if (freq >= 8192) {
	temp \|= CTL_CLK_SEL_4;
	} else if (freq >= 4096) {
	temp \|= CTL_CLK_SEL_8;
	} else if (freq >= 2048) {
	temp \|= CTL_CLK_SEL_16;
	} else if (freq >= 1024) {
	temp \|= CTL_CLK_SEL_32;
	} else if (freq >= 512) {
	temp \|= CTL_CLK_SEL_64;
	} else if (freq >= 256) {
	temp \|= CTL_CLK_SEL_128;
	} else if (freq >= 128) {
	temp \|= CTL_CLK_SEL_256;
	} else {
	temp \|= CTL_CLK_SEL_512;
	}

	if (!lsb_first) {
	temp \|= MSBF_ENB;
	}

	if (inv_clock) {
	temp \|= CLK_INV_ENB;
	}

	if (inv_phase) {
	temp \|= PHS_INV_ENB;
	}

	write_mmcr_byte(SC520_SSICTL, temp);

	return 0;
	}

	u8 ssi_txrx_byte(u8 data)
	{
	write_mmcr_byte(SC520_SSIXMIT, data);
	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
	write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_XMITRCV);
	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
	return read_mmcr_byte(SC520_SSIRCV);
	}


	void ssi_tx_byte(u8 data)
	{
	write_mmcr_byte(SC520_SSIXMIT, data);
	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
	write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_XMIT);
	}

	u8 ssi_rx_byte(void)
	{
	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
	write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_RCV);
	while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY);
	return read_mmcr_byte(SC520_SSIRCV);
	}

	#endif /* CONFIG_SC520 */