cpu/mpc83xx/cpu.c - github/trini/u-boot - Gitiles

 /*
  * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
  *
  * 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 MPC83xx family.
  *
  * Derived from the MPC8260 and MPC85xx.
  */

 #include <common.h>
 #include <watchdog.h>
 #include <command.h>
 #include <mpc83xx.h>
 #include <asm/processor.h>
 #if defined(CONFIG_OF_FLAT_TREE)
 #include <ft_build.h>
 #elif defined(CONFIG_OF_LIBFDT)
 #include <libfdt.h>
 #include <fdt_support.h>
 #endif

 DECLARE_GLOBAL_DATA_PTR;

 int checkcpu(void)
 {
 	volatile immap_t *immr;
 	ulong clock = gd->cpu_clk;
 	u32 pvr = get_pvr();
 	u32 spridr;
 	char buf[32];

 	immr = (immap_t *)CFG_IMMR;

 	puts("CPU:   ");

 	switch (pvr & 0xffff0000) {
 		case PVR_E300C1:
 			printf("e300c1, ");
 			break;

 		case PVR_E300C2:
 			printf("e300c2, ");
 			break;

 		case PVR_E300C3:
 			printf("e300c3, ");
 			break;

 		case PVR_E300C4:
 			printf("e300c4, ");
 			break;

 		default:
 			printf("Unknown core, ");
 	}

 	spridr = immr->sysconf.spridr;
 	switch(spridr) {
 	case SPR_8349E_REV10:
 	case SPR_8349E_REV11:
 	case SPR_8349E_REV31:
 		puts("MPC8349E, ");
 		break;
 	case SPR_8349_REV10:
 	case SPR_8349_REV11:
 	case SPR_8349_REV31:
 		puts("MPC8349, ");
 		break;
 	case SPR_8347E_REV10_TBGA:
 	case SPR_8347E_REV11_TBGA:
 	case SPR_8347E_REV31_TBGA:
 	case SPR_8347E_REV10_PBGA:
 	case SPR_8347E_REV11_PBGA:
 	case SPR_8347E_REV31_PBGA:
 		puts("MPC8347E, ");
 		break;
 	case SPR_8347_REV10_TBGA:
 	case SPR_8347_REV11_TBGA:
 	case SPR_8347_REV31_TBGA:
 	case SPR_8347_REV10_PBGA:
 	case SPR_8347_REV11_PBGA:
 	case SPR_8347_REV31_PBGA:
 		puts("MPC8347, ");
 		break;
 	case SPR_8343E_REV10:
 	case SPR_8343E_REV11:
 	case SPR_8343E_REV31:
 		puts("MPC8343E, ");
 		break;
 	case SPR_8343_REV10:
 	case SPR_8343_REV11:
 	case SPR_8343_REV31:
 		puts("MPC8343, ");
 		break;
 	case SPR_8360E_REV10:
 	case SPR_8360E_REV11:
 	case SPR_8360E_REV12:
 	case SPR_8360E_REV20:
 	case SPR_8360E_REV21:
 		puts("MPC8360E, ");
 		break;
 	case SPR_8360_REV10:
 	case SPR_8360_REV11:
 	case SPR_8360_REV12:
 	case SPR_8360_REV20:
 	case SPR_8360_REV21:
 		puts("MPC8360, ");
 		break;
 	case SPR_8323E_REV10:
 	case SPR_8323E_REV11:
 		puts("MPC8323E, ");
 		break;
 	case SPR_8323_REV10:
 	case SPR_8323_REV11:
 		puts("MPC8323, ");
 		break;
 	case SPR_8321E_REV10:
 	case SPR_8321E_REV11:
 		puts("MPC8321E, ");
 		break;
 	case SPR_8321_REV10:
 	case SPR_8321_REV11:
 		puts("MPC8321, ");
 		break;
 	case SPR_8311_REV10:
 		puts("MPC8311, ");
 		break;
 	case SPR_8311E_REV10:
 		puts("MPC8311E, ");
 		break;
 	case SPR_8313_REV10:
 		puts("MPC8313, ");
 		break;
 	case SPR_8313E_REV10:
 		puts("MPC8313E, ");
 		break;
 	case SPR_8315E_REV10:
 		puts("MPC8315E, ");
 		break;
 	case SPR_8315_REV10:
 		puts("MPC8315, ");
 		break;
 	case SPR_8314E_REV10:
 		puts("MPC8314E, ");
 		break;
 	case SPR_8314_REV10:
 		puts("MPC8314, ");
 		break;
 	case SPR_8379E_REV10:
 		puts("MPC8379E, ");
 		break;
 	case SPR_8379_REV10:
 		puts("MPC8379, ");
 		break;
 	case SPR_8378E_REV10:
 		puts("MPC8378E, ");
 		break;
 	case SPR_8378_REV10:
 		puts("MPC8378, ");
 		break;
 	case SPR_8377E_REV10:
 		puts("MPC8377E, ");
 		break;
 	case SPR_8377_REV10:
 		puts("MPC8377, ");
 		break;
 	default:
 		printf("Rev: Unknown revision number:%08x\n"
 			"Warning: Unsupported cpu revision!\n",spridr);
 		return 0;
 	}

 #if defined(CONFIG_MPC834X)
 	/* Multiple revisons of 834x processors may have the same SPRIDR value.
 	 * So use PVR to identify the revision number.
 	 */
 	printf("Rev: %02x at %s MHz", PVR_MAJ(pvr)<<4 | PVR_MIN(pvr), strmhz(buf, clock));
 #else
 	printf("Rev: %02x at %s MHz", spridr & 0x0000FFFF, strmhz(buf, clock));
 #endif
 	printf(", CSB: %4d MHz\n", gd->csb_clk / 1000000);

 	return 0;
 }


 /*
  * Program a UPM with the code supplied in the table.
  *
  * The 'dummy' variable is used to increment the MAD. 'dummy' is
  * supposed to be a pointer to the memory of the device being
  * programmed by the UPM.  The data in the MDR is written into
  * memory and the MAD is incremented every time there's a read
  * from 'dummy'. Unfortunately, the current prototype for this
  * function doesn't allow for passing the address of this
  * device, and changing the prototype will break a number lots
  * of other code, so we need to use a round-about way of finding
  * the value for 'dummy'.
  *
  * The value can be extracted from the base address bits of the
  * Base Register (BR) associated with the specific UPM.  To find
  * that BR, we need to scan all 8 BRs until we find the one that
  * has its MSEL bits matching the UPM we want.  Once we know the
  * right BR, we can extract the base address bits from it.
  *
  * The MxMR and the BR and OR of the chosen bank should all be
  * configured before calling this function.
  *
  * Parameters:
  * upm: 0=UPMA, 1=UPMB, 2=UPMC
  * table: Pointer to an array of values to program
  * size: Number of elements in the array.  Must be 64 or less.
  */
 void upmconfig (uint upm, uint *table, uint size)
 {
 #if defined(CONFIG_MPC834X)
 	volatile immap_t *immap = (immap_t *) CFG_IMMR;
 	volatile lbus83xx_t *lbus = &immap->lbus;
 	volatile uchar *dummy = NULL;
 	const u32 msel = (upm + 4) << BR_MSEL_SHIFT;	/* What the MSEL field in BRn should be */
 	volatile u32 *mxmr = &lbus->mamr + upm;	/* Pointer to mamr, mbmr, or mcmr */
 	uint i;

 	/* Scan all the banks to determine the base address of the device */
 	for (i = 0; i < 8; i++) {
 		if ((lbus->bank[i].br & BR_MSEL) == msel) {
 			dummy = (uchar *) (lbus->bank[i].br & BR_BA);
 			break;
 		}
 	}

 	if (!dummy) {
 		printf("Error: %s() could not find matching BR\n", __FUNCTION__);
 		hang();
 	}

 	/* Set the OP field in the MxMR to "write" and the MAD field to 000000 */
 	*mxmr = (*mxmr & 0xCFFFFFC0) | 0x10000000;

 	for (i = 0; i < size; i++) {
 		lbus->mdr = table[i];
 		__asm__ __volatile__ ("sync");
 		*dummy;	/* Write the value to memory and increment MAD */
 		__asm__ __volatile__ ("sync");
 	}

 	/* Set the OP field in the MxMR to "normal" and the MAD field to 000000 */
 	*mxmr &= 0xCFFFFFC0;
 #else
 	printf("Error: %s() not defined for this configuration.\n", __FUNCTION__);
 	hang();
 #endif
 }


 int
 do_reset (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 {
 	ulong msr;
 #ifndef MPC83xx_RESET
 	ulong addr;
 #endif

 	volatile immap_t *immap = (immap_t *) CFG_IMMR;

 #ifdef MPC83xx_RESET
 	/* Interrupts and MMU off */
 	__asm__ __volatile__ ("mfmsr    %0":"=r" (msr):);

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

 	/* enable Reset Control Reg */
 	immap->reset.rpr = 0x52535445;
 	__asm__ __volatile__ ("sync");
 	__asm__ __volatile__ ("isync");

 	/* confirm Reset Control Reg is enabled */
 	while(!((immap->reset.rcer) & RCER_CRE));

 	printf("Resetting the board.");
 	printf("\n");

 	udelay(200);

 	/* perform reset, only one bit */
 	immap->reset.rcr = RCR_SWHR;

 #else	/* ! MPC83xx_RESET */

 	immap->reset.rmr = RMR_CSRE;    /* Checkstop Reset enable */

 	/* 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));

 	/*
 	 * Trying to execute the next instruction at a non-existing address
 	 * should cause a machine check, resulting in reset
 	 */
 	addr = CFG_RESET_ADDRESS;

 	printf("resetting the board.");
 	printf("\n");
 	((void (*)(void)) addr) ();
 #endif	/* MPC83xx_RESET */

 	return 1;
 }


 /*
  * Get timebase clock frequency (like cpu_clk in Hz)
  */

 unsigned long get_tbclk(void)
 {
 	ulong tbclk;

 	tbclk = (gd->bus_clk + 3L) / 4L;

 	return tbclk;
 }


 #if defined(CONFIG_WATCHDOG)
 void watchdog_reset (void)
 {
 	int re_enable = disable_interrupts();

 	/* Reset the 83xx watchdog */
 	volatile immap_t *immr = (immap_t *) CFG_IMMR;
 	immr->wdt.swsrr = 0x556c;
 	immr->wdt.swsrr = 0xaa39;

 	if (re_enable)
 		enable_interrupts ();
 }
 #endif

 #if defined(CONFIG_OF_LIBFDT)

 /*
  * "Setter" functions used to add/modify FDT entries.
  */
 static int fdt_set_eth0(void *blob, int nodeoffset, const char *name, bd_t *bd)
 {
 	/* Fix it up if it exists, don't create it if it doesn't exist */
 	if (fdt_get_property(blob, nodeoffset, name, 0)) {
 		return fdt_setprop(blob, nodeoffset, name, bd->bi_enetaddr, 6);
 	}
 	return 0;
 }
 #ifdef CONFIG_HAS_ETH1
 /* second onboard ethernet port */
 static int fdt_set_eth1(void *blob, int nodeoffset, const char *name, bd_t *bd)
 {
 	/* Fix it up if it exists, don't create it if it doesn't exist */
 	if (fdt_get_property(blob, nodeoffset, name, 0)) {
 		return fdt_setprop(blob, nodeoffset, name, bd->bi_enet1addr, 6);
 	}
 	return 0;
 }
 #endif
 #ifdef CONFIG_HAS_ETH2
 /* third onboard ethernet port */
 static int fdt_set_eth2(void *blob, int nodeoffset, const char *name, bd_t *bd)
 {
 	/* Fix it up if it exists, don't create it if it doesn't exist */
 	if (fdt_get_property(blob, nodeoffset, name, 0)) {
 		return fdt_setprop(blob, nodeoffset, name, bd->bi_enet2addr, 6);
 	}
 	return 0;
 }
 #endif
 #ifdef CONFIG_HAS_ETH3
 /* fourth onboard ethernet port */
 static int fdt_set_eth3(void *blob, int nodeoffset, const char *name, bd_t *bd)
 {
 	/* Fix it up if it exists, don't create it if it doesn't exist */
 	if (fdt_get_property(blob, nodeoffset, name, 0)) {
 		return fdt_setprop(blob, nodeoffset, name, bd->bi_enet3addr, 6);
 	}
 	return 0;
 }
 #endif

 static int fdt_set_busfreq(void *blob, int nodeoffset, const char *name, bd_t *bd)
 {
 	u32  tmp;
 	/* Create or update the property */
 	tmp = cpu_to_be32(bd->bi_busfreq);
 	return fdt_setprop(blob, nodeoffset, name, &tmp, sizeof(tmp));
 }

 static int fdt_set_tbfreq(void *blob, int nodeoffset, const char *name, bd_t *bd)
 {
 	u32  tmp;
 	/* Create or update the property */
 	tmp = cpu_to_be32(OF_TBCLK);
 	return fdt_setprop(blob, nodeoffset, name, &tmp, sizeof(tmp));
 }


 static int fdt_set_clockfreq(void *blob, int nodeoffset, const char *name, bd_t *bd)
 {
 	u32  tmp;
 	/* Create or update the property */
 	tmp = cpu_to_be32(gd->core_clk);
 	return fdt_setprop(blob, nodeoffset, name, &tmp, sizeof(tmp));
 }

 #ifdef CONFIG_QE
 static int fdt_set_qe_busfreq(void *blob, int nodeoffset, const char *name, bd_t *bd)
 {
 	u32  tmp;
 	/* Create or update the property */
 	tmp = cpu_to_be32(gd->qe_clk);
 	return fdt_setprop(blob, nodeoffset, name, &tmp, sizeof(tmp));
 }

 static int fdt_set_qe_brgfreq(void *blob, int nodeoffset, const char *name, bd_t *bd)
 {
 	u32  tmp;
 	/* Create or update the property */
 	tmp = cpu_to_be32(gd->brg_clk);
 	return fdt_setprop(blob, nodeoffset, name, &tmp, sizeof(tmp));
 }
 #endif

 /*
  * Fixups to the fdt.
  */
 static const struct {
 	char *node;
 	char *prop;
 	int (*set_fn)(void *blob, int nodeoffset, const char *name, bd_t *bd);
 } fixup_props[] = {
 	{	"/cpus/" OF_CPU,
 		"timebase-frequency",
 		fdt_set_tbfreq
 	},
 	{	"/cpus/" OF_CPU,
 		"bus-frequency",
 		fdt_set_busfreq
 	},
 	{	"/cpus/" OF_CPU,
 		"clock-frequency",
 		fdt_set_clockfreq
 	},
 	{	"/" OF_SOC,
 		"bus-frequency",
 		fdt_set_busfreq
 	},
 	{	"/" OF_SOC "/serial@4500",
 		"clock-frequency",
 		fdt_set_busfreq
 	},
 	{	"/" OF_SOC "/serial@4600",
 		"clock-frequency",
 		fdt_set_busfreq
 	},
 #ifdef CONFIG_TSEC1
 	{	"/" OF_SOC "/ethernet@24000",
 		"mac-address",
 		fdt_set_eth0
 	},
 	{	"/" OF_SOC "/ethernet@24000",
 		"local-mac-address",
 		fdt_set_eth0
 	},
 #endif
 #ifdef CONFIG_TSEC2
 	{	"/" OF_SOC "/ethernet@25000",
 		"mac-address",
 		fdt_set_eth1
 	},
 	{	"/" OF_SOC "/ethernet@25000",
 		"local-mac-address",
 		fdt_set_eth1
 	},
 #endif
 #ifdef CONFIG_QE
 	{	"/" OF_QE,
 		"brg-frequency",
 		fdt_set_qe_brgfreq
 	},
 	{	"/" OF_QE,
 		"bus-frequency",
 		fdt_set_qe_busfreq
 	},
 #ifdef CONFIG_UEC_ETH1
 #if CFG_UEC1_UCC_NUM == 0  /* UCC1 */
 	{	"/" OF_QE "/ucc@2000",
 		"mac-address",
 		fdt_set_eth0
 	},
 	{	"/" OF_QE "/ucc@2000",
 		"local-mac-address",
 		fdt_set_eth0
 	},
 #elif CFG_UEC1_UCC_NUM == 2  /* UCC3 */
 	{	"/" OF_QE "/ucc@2200",
 		"mac-address",
 		fdt_set_eth0
 	},
 	{	"/" OF_QE "/ucc@2200",
 		"local-mac-address",
 		fdt_set_eth0
 	},
 #endif
 #endif /* CONFIG_UEC_ETH1 */
 #ifdef CONFIG_UEC_ETH2
 #if CFG_UEC2_UCC_NUM == 1  /* UCC2 */
 	{	"/" OF_QE "/ucc@3000",
 		"mac-address",
 		fdt_set_eth1
 	},
 	{	"/" OF_QE "/ucc@3000",
 		"local-mac-address",
 		fdt_set_eth1
 	},
 #elif CFG_UEC2_UCC_NUM == 3  /* UCC4 */
 	{	"/" OF_QE "/ucc@3200",
 		"mac-address",
 		fdt_set_eth1
 	},
 	{	"/" OF_QE "/ucc@3200",
 		"local-mac-address",
 		fdt_set_eth1
 	},
 #endif
 #endif /* CONFIG_UEC_ETH2 */
 #endif /* CONFIG_QE */
 };

 void
 ft_cpu_setup(void *blob, bd_t *bd)
 {
 	int nodeoffset;
 	int err;
 	int j;

 	for (j = 0; j < (sizeof(fixup_props) / sizeof(fixup_props[0])); j++) {
 		nodeoffset = fdt_path_offset(blob, fixup_props[j].node);
 		if (nodeoffset >= 0) {
 			err = fixup_props[j].set_fn(blob, nodeoffset,
 						    fixup_props[j].prop, bd);
 			if (err < 0)
 				debug("Problem setting %s = %s: %s\n",
 				      fixup_props[j].node, fixup_props[j].prop,
 				      fdt_strerror(err));
 		} else {
 			debug("Couldn't find %s: %s\n",
 			      fixup_props[j].node, fdt_strerror(nodeoffset));
 		}
 	}

 	fdt_fixup_memory(blob, (u64)bd->bi_memstart, (u64)bd->bi_memsize);
 }
 #elif defined(CONFIG_OF_FLAT_TREE)
 void
 ft_cpu_setup(void *blob, bd_t *bd)
 {
 	u32 *p;
 	int len;
 	ulong clock;

 	clock = bd->bi_busfreq;
 	p = ft_get_prop(blob, "/cpus/" OF_CPU "/bus-frequency", &len);
 	if (p != NULL)
 		*p = cpu_to_be32(clock);

 	p = ft_get_prop(blob, "/" OF_SOC "/bus-frequency", &len);
 	if (p != NULL)
 		*p = cpu_to_be32(clock);

 	p = ft_get_prop(blob, "/" OF_SOC "/serial@4500/clock-frequency", &len);
 	if (p != NULL)
 		*p = cpu_to_be32(clock);

 	p = ft_get_prop(blob, "/" OF_SOC "/serial@4600/clock-frequency", &len);
 	if (p != NULL)
 		*p = cpu_to_be32(clock);

 #ifdef CONFIG_TSEC1
 	p = ft_get_prop(blob, "/" OF_SOC "/ethernet@24000/mac-address", &len);
 	if (p != NULL)
 		memcpy(p, bd->bi_enetaddr, 6);

 	p = ft_get_prop(blob, "/" OF_SOC "/ethernet@24000/local-mac-address", &len);
 	if (p != NULL)
 		memcpy(p, bd->bi_enetaddr, 6);
 #endif

 #ifdef CONFIG_TSEC2
 	p = ft_get_prop(blob, "/" OF_SOC "/ethernet@25000/mac-address", &len);
 	if (p != NULL)
 		memcpy(p, bd->bi_enet1addr, 6);

 	p = ft_get_prop(blob, "/" OF_SOC "/ethernet@25000/local-mac-address", &len);
 	if (p != NULL)
 		memcpy(p, bd->bi_enet1addr, 6);
 #endif

 #ifdef CONFIG_UEC_ETH1
 #if CFG_UEC1_UCC_NUM == 0  /* UCC1 */
 	p = ft_get_prop(blob, "/" OF_QE "/ucc@2000/mac-address", &len);
 	if (p != NULL)
 		memcpy(p, bd->bi_enetaddr, 6);

 	p = ft_get_prop(blob, "/" OF_QE "/ucc@2000/local-mac-address", &len);
 	if (p != NULL)
 		memcpy(p, bd->bi_enetaddr, 6);
 #elif CFG_UEC1_UCC_NUM == 2  /* UCC3 */
 	p = ft_get_prop(blob, "/" OF_QE "/ucc@2200/mac-address", &len);
 	if (p != NULL)
 		memcpy(p, bd->bi_enetaddr, 6);

 	p = ft_get_prop(blob, "/" OF_QE "/ucc@2200/local-mac-address", &len);
 	if (p != NULL)
 		memcpy(p, bd->bi_enetaddr, 6);
 #endif
 #endif

 #ifdef CONFIG_UEC_ETH2
 #if CFG_UEC2_UCC_NUM == 1  /* UCC2 */
 	p = ft_get_prop(blob, "/" OF_QE "/ucc@3000/mac-address", &len);
 	if (p != NULL)
 		memcpy(p, bd->bi_enet1addr, 6);

 	p = ft_get_prop(blob, "/" OF_QE "/ucc@3000/local-mac-address", &len);
 	if (p != NULL)
 		memcpy(p, bd->bi_enet1addr, 6);
 #elif CFG_UEC2_UCC_NUM == 3  /* UCC4 */
 	p = ft_get_prop(blob, "/" OF_QE "/ucc@3200/mac-address", &len);
 	if (p != NULL)
 		memcpy(p, bd->bi_enet1addr, 6);

 	p = ft_get_prop(blob, "/" OF_QE "/ucc@3200/local-mac-address", &len);
 	if (p != NULL)
 		memcpy(p, bd->bi_enet1addr, 6);
 #endif
 #endif
 }
 #endif

 #if defined(CONFIG_DDR_ECC)
 void dma_init(void)
 {
 	volatile immap_t *immap = (immap_t *)CFG_IMMR;
 	volatile dma83xx_t *dma = &immap->dma;
 	volatile u32 status = swab32(dma->dmasr0);
 	volatile u32 dmamr0 = swab32(dma->dmamr0);

 	debug("DMA-init\n");

 	/* initialize DMASARn, DMADAR and DMAABCRn */
 	dma->dmadar0 = (u32)0;
 	dma->dmasar0 = (u32)0;
 	dma->dmabcr0 = 0;

 	__asm__ __volatile__ ("sync");
 	__asm__ __volatile__ ("isync");

 	/* clear CS bit */
 	dmamr0 &= ~DMA_CHANNEL_START;
 	dma->dmamr0 = swab32(dmamr0);
 	__asm__ __volatile__ ("sync");
 	__asm__ __volatile__ ("isync");

 	/* while the channel is busy, spin */
 	while(status & DMA_CHANNEL_BUSY) {
 		status = swab32(dma->dmasr0);
 	}

 	debug("DMA-init end\n");
 }

 uint dma_check(void)
 {
 	volatile immap_t *immap = (immap_t *)CFG_IMMR;
 	volatile dma83xx_t *dma = &immap->dma;
 	volatile u32 status = swab32(dma->dmasr0);
 	volatile u32 byte_count = swab32(dma->dmabcr0);

 	/* while the channel is busy, spin */
 	while (status & DMA_CHANNEL_BUSY) {
 		status = swab32(dma->dmasr0);
 	}

 	if (status & DMA_CHANNEL_TRANSFER_ERROR) {
 		printf ("DMA Error: status = %x @ %d\n", status, byte_count);
 	}

 	return status;
 }

 int dma_xfer(void *dest, u32 count, void *src)
 {
 	volatile immap_t *immap = (immap_t *)CFG_IMMR;
 	volatile dma83xx_t *dma = &immap->dma;
 	volatile u32 dmamr0;

 	/* initialize DMASARn, DMADAR and DMAABCRn */
 	dma->dmadar0 = swab32((u32)dest);
 	dma->dmasar0 = swab32((u32)src);
 	dma->dmabcr0 = swab32(count);

 	__asm__ __volatile__ ("sync");
 	__asm__ __volatile__ ("isync");

 	/* init direct transfer, clear CS bit */
 	dmamr0 = (DMA_CHANNEL_TRANSFER_MODE_DIRECT |
 			DMA_CHANNEL_SOURCE_ADDRESS_HOLD_8B |
 			DMA_CHANNEL_SOURCE_ADRESSS_HOLD_EN);

 	dma->dmamr0 = swab32(dmamr0);

 	__asm__ __volatile__ ("sync");
 	__asm__ __volatile__ ("isync");

 	/* set CS to start DMA transfer */
 	dmamr0 |= DMA_CHANNEL_START;
 	dma->dmamr0 = swab32(dmamr0);
 	__asm__ __volatile__ ("sync");
 	__asm__ __volatile__ ("isync");

 	return ((int)dma_check());
 }
 #endif /*CONFIG_DDR_ECC*/
	/*
	* Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
	*
	* 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 MPC83xx family.
	*
	* Derived from the MPC8260 and MPC85xx.
	*/

	#include <common.h>
	#include <watchdog.h>
	#include <command.h>
	#include <mpc83xx.h>
	#include <asm/processor.h>
	#if defined(CONFIG_OF_FLAT_TREE)
	#include <ft_build.h>
	#elif defined(CONFIG_OF_LIBFDT)
	#include <libfdt.h>
	#include <fdt_support.h>
	#endif

	DECLARE_GLOBAL_DATA_PTR;

	int checkcpu(void)
	{
	volatile immap_t *immr;
	ulong clock = gd->cpu_clk;
	u32 pvr = get_pvr();
	u32 spridr;
	char buf[32];

	immr = (immap_t *)CFG_IMMR;

	puts("CPU: ");

	switch (pvr & 0xffff0000) {
	case PVR_E300C1:
	printf("e300c1, ");
	break;

	case PVR_E300C2:
	printf("e300c2, ");
	break;

	case PVR_E300C3:
	printf("e300c3, ");
	break;

	case PVR_E300C4:
	printf("e300c4, ");
	break;

	default:
	printf("Unknown core, ");
	}

	spridr = immr->sysconf.spridr;
	switch(spridr) {
	case SPR_8349E_REV10:
	case SPR_8349E_REV11:
	case SPR_8349E_REV31:
	puts("MPC8349E, ");
	break;
	case SPR_8349_REV10:
	case SPR_8349_REV11:
	case SPR_8349_REV31:
	puts("MPC8349, ");
	break;
	case SPR_8347E_REV10_TBGA:
	case SPR_8347E_REV11_TBGA:
	case SPR_8347E_REV31_TBGA:
	case SPR_8347E_REV10_PBGA:
	case SPR_8347E_REV11_PBGA:
	case SPR_8347E_REV31_PBGA:
	puts("MPC8347E, ");
	break;
	case SPR_8347_REV10_TBGA:
	case SPR_8347_REV11_TBGA:
	case SPR_8347_REV31_TBGA:
	case SPR_8347_REV10_PBGA:
	case SPR_8347_REV11_PBGA:
	case SPR_8347_REV31_PBGA:
	puts("MPC8347, ");
	break;
	case SPR_8343E_REV10:
	case SPR_8343E_REV11:
	case SPR_8343E_REV31:
	puts("MPC8343E, ");
	break;
	case SPR_8343_REV10:
	case SPR_8343_REV11:
	case SPR_8343_REV31:
	puts("MPC8343, ");
	break;
	case SPR_8360E_REV10:
	case SPR_8360E_REV11:
	case SPR_8360E_REV12:
	case SPR_8360E_REV20:
	case SPR_8360E_REV21:
	puts("MPC8360E, ");
	break;
	case SPR_8360_REV10:
	case SPR_8360_REV11:
	case SPR_8360_REV12:
	case SPR_8360_REV20:
	case SPR_8360_REV21:
	puts("MPC8360, ");
	break;
	case SPR_8323E_REV10:
	case SPR_8323E_REV11:
	puts("MPC8323E, ");
	break;
	case SPR_8323_REV10:
	case SPR_8323_REV11:
	puts("MPC8323, ");
	break;
	case SPR_8321E_REV10:
	case SPR_8321E_REV11:
	puts("MPC8321E, ");
	break;
	case SPR_8321_REV10:
	case SPR_8321_REV11:
	puts("MPC8321, ");
	break;
	case SPR_8311_REV10:
	puts("MPC8311, ");
	break;
	case SPR_8311E_REV10:
	puts("MPC8311E, ");
	break;
	case SPR_8313_REV10:
	puts("MPC8313, ");
	break;
	case SPR_8313E_REV10:
	puts("MPC8313E, ");
	break;
	case SPR_8315E_REV10:
	puts("MPC8315E, ");
	break;
	case SPR_8315_REV10:
	puts("MPC8315, ");
	break;
	case SPR_8314E_REV10:
	puts("MPC8314E, ");
	break;
	case SPR_8314_REV10:
	puts("MPC8314, ");
	break;
	case SPR_8379E_REV10:
	puts("MPC8379E, ");
	break;
	case SPR_8379_REV10:
	puts("MPC8379, ");
	break;
	case SPR_8378E_REV10:
	puts("MPC8378E, ");
	break;
	case SPR_8378_REV10:
	puts("MPC8378, ");
	break;
	case SPR_8377E_REV10:
	puts("MPC8377E, ");
	break;
	case SPR_8377_REV10:
	puts("MPC8377, ");
	break;
	default:
	printf("Rev: Unknown revision number:%08x\n"
	"Warning: Unsupported cpu revision!\n",spridr);
	return 0;
	}

	#if defined(CONFIG_MPC834X)
	/* Multiple revisons of 834x processors may have the same SPRIDR value.
	* So use PVR to identify the revision number.
	*/
	printf("Rev: %02x at %s MHz", PVR_MAJ(pvr)<<4 \| PVR_MIN(pvr), strmhz(buf, clock));
	#else
	printf("Rev: %02x at %s MHz", spridr & 0x0000FFFF, strmhz(buf, clock));
	#endif
	printf(", CSB: %4d MHz\n", gd->csb_clk / 1000000);

	return 0;
	}


	/*
	* Program a UPM with the code supplied in the table.
	*
	* The 'dummy' variable is used to increment the MAD. 'dummy' is
	* supposed to be a pointer to the memory of the device being
	* programmed by the UPM. The data in the MDR is written into
	* memory and the MAD is incremented every time there's a read
	* from 'dummy'. Unfortunately, the current prototype for this
	* function doesn't allow for passing the address of this
	* device, and changing the prototype will break a number lots
	* of other code, so we need to use a round-about way of finding
	* the value for 'dummy'.
	*
	* The value can be extracted from the base address bits of the
	* Base Register (BR) associated with the specific UPM. To find
	* that BR, we need to scan all 8 BRs until we find the one that
	* has its MSEL bits matching the UPM we want. Once we know the
	* right BR, we can extract the base address bits from it.
	*
	* The MxMR and the BR and OR of the chosen bank should all be
	* configured before calling this function.
	*
	* Parameters:
	* upm: 0=UPMA, 1=UPMB, 2=UPMC
	* table: Pointer to an array of values to program
	* size: Number of elements in the array. Must be 64 or less.
	*/
	void upmconfig (uint upm, uint *table, uint size)
	{
	#if defined(CONFIG_MPC834X)
	volatile immap_t immap = (immap_t ) CFG_IMMR;
	volatile lbus83xx_t *lbus = &immap->lbus;
	volatile uchar *dummy = NULL;
	const u32 msel = (upm + 4) << BR_MSEL_SHIFT; /* What the MSEL field in BRn should be */
	volatile u32 mxmr = &lbus->mamr + upm; / Pointer to mamr, mbmr, or mcmr */
	uint i;

	/* Scan all the banks to determine the base address of the device */
	for (i = 0; i < 8; i++) {
	if ((lbus->bank[i].br & BR_MSEL) == msel) {
	dummy = (uchar *) (lbus->bank[i].br & BR_BA);
	break;
	}
	}

	if (!dummy) {
	printf("Error: %s() could not find matching BR\n", __FUNCTION__);
	hang();
	}

	/* Set the OP field in the MxMR to "write" and the MAD field to 000000 */
	mxmr = (mxmr & 0xCFFFFFC0) \| 0x10000000;

	for (i = 0; i < size; i++) {
	lbus->mdr = table[i];
	__asm__ __volatile__ ("sync");
	dummy; / Write the value to memory and increment MAD */
	__asm__ __volatile__ ("sync");
	}

	/* Set the OP field in the MxMR to "normal" and the MAD field to 000000 */
	*mxmr &= 0xCFFFFFC0;
	#else
	printf("Error: %s() not defined for this configuration.\n", __FUNCTION__);
	hang();
	#endif
	}


	int
	do_reset (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
	{
	ulong msr;
	#ifndef MPC83xx_RESET
	ulong addr;
	#endif

	volatile immap_t immap = (immap_t ) CFG_IMMR;

	#ifdef MPC83xx_RESET
	/* Interrupts and MMU off */
	__asm__ __volatile__ ("mfmsr %0":"=r" (msr):);

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

	/* enable Reset Control Reg */
	immap->reset.rpr = 0x52535445;
	__asm__ __volatile__ ("sync");
	__asm__ __volatile__ ("isync");

	/* confirm Reset Control Reg is enabled */
	while(!((immap->reset.rcer) & RCER_CRE));

	printf("Resetting the board.");
	printf("\n");

	udelay(200);

	/* perform reset, only one bit */
	immap->reset.rcr = RCR_SWHR;

	#else /* ! MPC83xx_RESET */

	immap->reset.rmr = RMR_CSRE; /* Checkstop Reset enable */

	/* 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));

	/*
	* Trying to execute the next instruction at a non-existing address
	* should cause a machine check, resulting in reset
	*/
	addr = CFG_RESET_ADDRESS;

	printf("resetting the board.");
	printf("\n");
	((void (*)(void)) addr) ();
	#endif /* MPC83xx_RESET */

	return 1;
	}


	/*
	* Get timebase clock frequency (like cpu_clk in Hz)
	*/

	unsigned long get_tbclk(void)
	{
	ulong tbclk;

	tbclk = (gd->bus_clk + 3L) / 4L;

	return tbclk;
	}


	#if defined(CONFIG_WATCHDOG)
	void watchdog_reset (void)
	{
	int re_enable = disable_interrupts();

	/* Reset the 83xx watchdog */
	volatile immap_t immr = (immap_t ) CFG_IMMR;
	immr->wdt.swsrr = 0x556c;
	immr->wdt.swsrr = 0xaa39;

	if (re_enable)
	enable_interrupts ();
	}
	#endif

	#if defined(CONFIG_OF_LIBFDT)

	/*
	* "Setter" functions used to add/modify FDT entries.
	*/
	static int fdt_set_eth0(void blob, int nodeoffset, const char name, bd_t *bd)
	{
	/* Fix it up if it exists, don't create it if it doesn't exist */
	if (fdt_get_property(blob, nodeoffset, name, 0)) {
	return fdt_setprop(blob, nodeoffset, name, bd->bi_enetaddr, 6);
	}
	return 0;
	}
	#ifdef CONFIG_HAS_ETH1
	/* second onboard ethernet port */
	static int fdt_set_eth1(void blob, int nodeoffset, const char name, bd_t *bd)
	{
	/* Fix it up if it exists, don't create it if it doesn't exist */
	if (fdt_get_property(blob, nodeoffset, name, 0)) {
	return fdt_setprop(blob, nodeoffset, name, bd->bi_enet1addr, 6);
	}
	return 0;
	}
	#endif
	#ifdef CONFIG_HAS_ETH2
	/* third onboard ethernet port */
	static int fdt_set_eth2(void blob, int nodeoffset, const char name, bd_t *bd)
	{
	/* Fix it up if it exists, don't create it if it doesn't exist */
	if (fdt_get_property(blob, nodeoffset, name, 0)) {
	return fdt_setprop(blob, nodeoffset, name, bd->bi_enet2addr, 6);
	}
	return 0;
	}
	#endif
	#ifdef CONFIG_HAS_ETH3
	/* fourth onboard ethernet port */
	static int fdt_set_eth3(void blob, int nodeoffset, const char name, bd_t *bd)
	{
	/* Fix it up if it exists, don't create it if it doesn't exist */
	if (fdt_get_property(blob, nodeoffset, name, 0)) {
	return fdt_setprop(blob, nodeoffset, name, bd->bi_enet3addr, 6);
	}
	return 0;
	}
	#endif

	static int fdt_set_busfreq(void blob, int nodeoffset, const char name, bd_t *bd)
	{
	u32 tmp;
	/* Create or update the property */
	tmp = cpu_to_be32(bd->bi_busfreq);
	return fdt_setprop(blob, nodeoffset, name, &tmp, sizeof(tmp));
	}

	static int fdt_set_tbfreq(void blob, int nodeoffset, const char name, bd_t *bd)
	{
	u32 tmp;
	/* Create or update the property */
	tmp = cpu_to_be32(OF_TBCLK);
	return fdt_setprop(blob, nodeoffset, name, &tmp, sizeof(tmp));
	}


	static int fdt_set_clockfreq(void blob, int nodeoffset, const char name, bd_t *bd)
	{
	u32 tmp;
	/* Create or update the property */
	tmp = cpu_to_be32(gd->core_clk);
	return fdt_setprop(blob, nodeoffset, name, &tmp, sizeof(tmp));
	}

	#ifdef CONFIG_QE
	static int fdt_set_qe_busfreq(void blob, int nodeoffset, const char name, bd_t *bd)
	{
	u32 tmp;
	/* Create or update the property */
	tmp = cpu_to_be32(gd->qe_clk);
	return fdt_setprop(blob, nodeoffset, name, &tmp, sizeof(tmp));
	}

	static int fdt_set_qe_brgfreq(void blob, int nodeoffset, const char name, bd_t *bd)
	{
	u32 tmp;
	/* Create or update the property */
	tmp = cpu_to_be32(gd->brg_clk);
	return fdt_setprop(blob, nodeoffset, name, &tmp, sizeof(tmp));
	}
	#endif

	/*
	* Fixups to the fdt.
	*/
	static const struct {
	char *node;
	char *prop;
	int (set_fn)(void blob, int nodeoffset, const char name, bd_t bd);
	} fixup_props[] = {
	{ "/cpus/" OF_CPU,
	"timebase-frequency",
	fdt_set_tbfreq
	},
	{ "/cpus/" OF_CPU,
	"bus-frequency",
	fdt_set_busfreq
	},
	{ "/cpus/" OF_CPU,
	"clock-frequency",
	fdt_set_clockfreq
	},
	{ "/" OF_SOC,
	"bus-frequency",
	fdt_set_busfreq
	},
	{ "/" OF_SOC "/serial@4500",
	"clock-frequency",
	fdt_set_busfreq
	},
	{ "/" OF_SOC "/serial@4600",
	"clock-frequency",
	fdt_set_busfreq
	},
	#ifdef CONFIG_TSEC1
	{ "/" OF_SOC "/ethernet@24000",
	"mac-address",
	fdt_set_eth0
	},
	{ "/" OF_SOC "/ethernet@24000",
	"local-mac-address",
	fdt_set_eth0
	},
	#endif
	#ifdef CONFIG_TSEC2
	{ "/" OF_SOC "/ethernet@25000",
	"mac-address",
	fdt_set_eth1
	},
	{ "/" OF_SOC "/ethernet@25000",
	"local-mac-address",
	fdt_set_eth1
	},
	#endif
	#ifdef CONFIG_QE
	{ "/" OF_QE,
	"brg-frequency",
	fdt_set_qe_brgfreq
	},
	{ "/" OF_QE,
	"bus-frequency",
	fdt_set_qe_busfreq
	},
	#ifdef CONFIG_UEC_ETH1
	#if CFG_UEC1_UCC_NUM == 0 /* UCC1 */
	{ "/" OF_QE "/ucc@2000",
	"mac-address",
	fdt_set_eth0
	},
	{ "/" OF_QE "/ucc@2000",
	"local-mac-address",
	fdt_set_eth0
	},
	#elif CFG_UEC1_UCC_NUM == 2 /* UCC3 */
	{ "/" OF_QE "/ucc@2200",
	"mac-address",
	fdt_set_eth0
	},
	{ "/" OF_QE "/ucc@2200",
	"local-mac-address",
	fdt_set_eth0
	},
	#endif
	#endif /* CONFIG_UEC_ETH1 */
	#ifdef CONFIG_UEC_ETH2
	#if CFG_UEC2_UCC_NUM == 1 /* UCC2 */
	{ "/" OF_QE "/ucc@3000",
	"mac-address",
	fdt_set_eth1
	},
	{ "/" OF_QE "/ucc@3000",
	"local-mac-address",
	fdt_set_eth1
	},
	#elif CFG_UEC2_UCC_NUM == 3 /* UCC4 */
	{ "/" OF_QE "/ucc@3200",
	"mac-address",
	fdt_set_eth1
	},
	{ "/" OF_QE "/ucc@3200",
	"local-mac-address",
	fdt_set_eth1
	},
	#endif
	#endif /* CONFIG_UEC_ETH2 */
	#endif /* CONFIG_QE */
	};

	void
	ft_cpu_setup(void blob, bd_t bd)
	{
	int nodeoffset;
	int err;
	int j;

	for (j = 0; j < (sizeof(fixup_props) / sizeof(fixup_props[0])); j++) {
	nodeoffset = fdt_path_offset(blob, fixup_props[j].node);
	if (nodeoffset >= 0) {
	err = fixup_props[j].set_fn(blob, nodeoffset,
	fixup_props[j].prop, bd);
	if (err < 0)
	debug("Problem setting %s = %s: %s\n",
	fixup_props[j].node, fixup_props[j].prop,
	fdt_strerror(err));
	} else {
	debug("Couldn't find %s: %s\n",
	fixup_props[j].node, fdt_strerror(nodeoffset));
	}
	}

	fdt_fixup_memory(blob, (u64)bd->bi_memstart, (u64)bd->bi_memsize);
	}
	#elif defined(CONFIG_OF_FLAT_TREE)
	void
	ft_cpu_setup(void blob, bd_t bd)
	{
	u32 *p;
	int len;
	ulong clock;

	clock = bd->bi_busfreq;
	p = ft_get_prop(blob, "/cpus/" OF_CPU "/bus-frequency", &len);
	if (p != NULL)
	*p = cpu_to_be32(clock);

	p = ft_get_prop(blob, "/" OF_SOC "/bus-frequency", &len);
	if (p != NULL)
	*p = cpu_to_be32(clock);

	p = ft_get_prop(blob, "/" OF_SOC "/serial@4500/clock-frequency", &len);
	if (p != NULL)
	*p = cpu_to_be32(clock);

	p = ft_get_prop(blob, "/" OF_SOC "/serial@4600/clock-frequency", &len);
	if (p != NULL)
	*p = cpu_to_be32(clock);

	#ifdef CONFIG_TSEC1
	p = ft_get_prop(blob, "/" OF_SOC "/ethernet@24000/mac-address", &len);
	if (p != NULL)
	memcpy(p, bd->bi_enetaddr, 6);

	p = ft_get_prop(blob, "/" OF_SOC "/ethernet@24000/local-mac-address", &len);
	if (p != NULL)
	memcpy(p, bd->bi_enetaddr, 6);
	#endif

	#ifdef CONFIG_TSEC2
	p = ft_get_prop(blob, "/" OF_SOC "/ethernet@25000/mac-address", &len);
	if (p != NULL)
	memcpy(p, bd->bi_enet1addr, 6);

	p = ft_get_prop(blob, "/" OF_SOC "/ethernet@25000/local-mac-address", &len);
	if (p != NULL)
	memcpy(p, bd->bi_enet1addr, 6);
	#endif

	#ifdef CONFIG_UEC_ETH1
	#if CFG_UEC1_UCC_NUM == 0 /* UCC1 */
	p = ft_get_prop(blob, "/" OF_QE "/ucc@2000/mac-address", &len);
	if (p != NULL)
	memcpy(p, bd->bi_enetaddr, 6);

	p = ft_get_prop(blob, "/" OF_QE "/ucc@2000/local-mac-address", &len);
	if (p != NULL)
	memcpy(p, bd->bi_enetaddr, 6);
	#elif CFG_UEC1_UCC_NUM == 2 /* UCC3 */
	p = ft_get_prop(blob, "/" OF_QE "/ucc@2200/mac-address", &len);
	if (p != NULL)
	memcpy(p, bd->bi_enetaddr, 6);

	p = ft_get_prop(blob, "/" OF_QE "/ucc@2200/local-mac-address", &len);
	if (p != NULL)
	memcpy(p, bd->bi_enetaddr, 6);
	#endif
	#endif

	#ifdef CONFIG_UEC_ETH2
	#if CFG_UEC2_UCC_NUM == 1 /* UCC2 */
	p = ft_get_prop(blob, "/" OF_QE "/ucc@3000/mac-address", &len);
	if (p != NULL)
	memcpy(p, bd->bi_enet1addr, 6);

	p = ft_get_prop(blob, "/" OF_QE "/ucc@3000/local-mac-address", &len);
	if (p != NULL)
	memcpy(p, bd->bi_enet1addr, 6);
	#elif CFG_UEC2_UCC_NUM == 3 /* UCC4 */
	p = ft_get_prop(blob, "/" OF_QE "/ucc@3200/mac-address", &len);
	if (p != NULL)
	memcpy(p, bd->bi_enet1addr, 6);

	p = ft_get_prop(blob, "/" OF_QE "/ucc@3200/local-mac-address", &len);
	if (p != NULL)
	memcpy(p, bd->bi_enet1addr, 6);
	#endif
	#endif
	}
	#endif

	#if defined(CONFIG_DDR_ECC)
	void dma_init(void)
	{
	volatile immap_t immap = (immap_t )CFG_IMMR;
	volatile dma83xx_t *dma = &immap->dma;
	volatile u32 status = swab32(dma->dmasr0);
	volatile u32 dmamr0 = swab32(dma->dmamr0);

	debug("DMA-init\n");

	/* initialize DMASARn, DMADAR and DMAABCRn */
	dma->dmadar0 = (u32)0;
	dma->dmasar0 = (u32)0;
	dma->dmabcr0 = 0;

	__asm__ __volatile__ ("sync");
	__asm__ __volatile__ ("isync");

	/* clear CS bit */
	dmamr0 &= ~DMA_CHANNEL_START;
	dma->dmamr0 = swab32(dmamr0);
	__asm__ __volatile__ ("sync");
	__asm__ __volatile__ ("isync");

	/* while the channel is busy, spin */
	while(status & DMA_CHANNEL_BUSY) {
	status = swab32(dma->dmasr0);
	}

	debug("DMA-init end\n");
	}

	uint dma_check(void)
	{
	volatile immap_t immap = (immap_t )CFG_IMMR;
	volatile dma83xx_t *dma = &immap->dma;
	volatile u32 status = swab32(dma->dmasr0);
	volatile u32 byte_count = swab32(dma->dmabcr0);

	/* while the channel is busy, spin */
	while (status & DMA_CHANNEL_BUSY) {
	status = swab32(dma->dmasr0);
	}

	if (status & DMA_CHANNEL_TRANSFER_ERROR) {
	printf ("DMA Error: status = %x @ %d\n", status, byte_count);
	}

	return status;
	}

	int dma_xfer(void dest, u32 count, void src)
	{
	volatile immap_t immap = (immap_t )CFG_IMMR;
	volatile dma83xx_t *dma = &immap->dma;
	volatile u32 dmamr0;

	/* initialize DMASARn, DMADAR and DMAABCRn */
	dma->dmadar0 = swab32((u32)dest);
	dma->dmasar0 = swab32((u32)src);
	dma->dmabcr0 = swab32(count);

	__asm__ __volatile__ ("sync");
	__asm__ __volatile__ ("isync");

	/* init direct transfer, clear CS bit */
	dmamr0 = (DMA_CHANNEL_TRANSFER_MODE_DIRECT \|
	DMA_CHANNEL_SOURCE_ADDRESS_HOLD_8B \|
	DMA_CHANNEL_SOURCE_ADRESSS_HOLD_EN);

	dma->dmamr0 = swab32(dmamr0);

	__asm__ __volatile__ ("sync");
	__asm__ __volatile__ ("isync");

	/* set CS to start DMA transfer */
	dmamr0 \|= DMA_CHANNEL_START;
	dma->dmamr0 = swab32(dmamr0);
	__asm__ __volatile__ ("sync");
	__asm__ __volatile__ ("isync");

	return ((int)dma_check());
	}
	#endif /CONFIG_DDR_ECC/