/* The dpalloc function used and implemented in this file was derieved * from PPCBoot/U-Boot file "cpu/mpc8260/commproc.c". *//* Author: Arun Dharankar <ADharankar@ATTBI.Com> * This example is meant to only demonstrate how the IDMA could be used. *//* * This file is based on "arch/ppc/8260_io/commproc.c" - here is it's * copyright notice: * * General Purpose functions for the global management of the * 8260 Communication Processor Module. * Copyright (c) 1999 Dan Malek (dmalek@jlc.net) * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com) *  2.3.99 Updates * * In addition to the individual control of the communication * channels, there are a few functions that globally affect the * communication processor. * * Buffer descriptors must be allocated from the dual ported memory * space.  The allocator for that is here.  When the communication * process is reset, we reclaim the memory available.  There is * currently no deallocator for this memory. */#include <common.h>#include <exports.h>DECLARE_GLOBAL_DATA_PTR;#define STANDALONE#ifndef STANDALONE			/* Linked into/Part of  PPCBoot */#include <command.h>#include <watchdog.h>#else					/* Standalone app of PPCBoot */#define WATCHDOG_RESET() {						\			*(ushort *)(CFG_IMMR + 0x1000E) = 0x556c;	\			*(ushort *)(CFG_IMMR + 0x1000E) = 0xaa39;	\		}#endif	/* STANDALONE */static int debug = 1;#define DEBUG(fmt, args...)	 {					\	if(debug != 0) {						\		printf("[%s %d %s]: ",__FILE__,__LINE__,__FUNCTION__);	\		printf(fmt, ##args);					\	}								\}#define CPM_CR_IDMA1_SBLOCK  (0x14)#define CPM_CR_IDMA2_SBLOCK  (0x15)#define CPM_CR_IDMA3_SBLOCK  (0x16)#define CPM_CR_IDMA4_SBLOCK  (0x17)#define CPM_CR_IDMA1_PAGE    (0x07)#define CPM_CR_IDMA2_PAGE    (0x08)#define CPM_CR_IDMA3_PAGE    (0x09)#define CPM_CR_IDMA4_PAGE    (0x0a)#define PROFF_IDMA1_BASE     ((uint)0x87fe)#define PROFF_IDMA2_BASE     ((uint)0x88fe)#define PROFF_IDMA3_BASE     ((uint)0x89fe)#define PROFF_IDMA4_BASE     ((uint)0x8afe)#define CPM_CR_INIT_TRX     ((ushort)0x0000)#define CPM_CR_FLG  ((ushort)0x0001)#define mk_cr_cmd(PG, SBC, MCN, OP) \    ((PG << 26) | (SBC << 21) | (MCN << 6) | OP)#pragma pack(1)typedef struct ibdbits {	unsigned b_valid:1;	unsigned b_resv1:1;	unsigned b_wrap:1;	unsigned b_interrupt:1;	unsigned b_last:1;	unsigned b_resv2:1;	unsigned b_cm:1;	unsigned b_resv3:2;	unsigned b_sdn:1;	unsigned b_ddn:1;	unsigned b_dgbl:1;	unsigned b_dbo:2;	unsigned b_resv4:1;	unsigned b_ddtb:1;	unsigned b_resv5:2;	unsigned b_sgbl:1;	unsigned b_sbo:2;	unsigned b_resv6:1;	unsigned b_sdtb:1;	unsigned b_resv7:9;} ibdbits_t;#pragma pack(1)typedef union ibdbitsu {	ibdbits_t b;	uint i;} ibdbitsu_t;#pragma pack(1)typedef struct idma_buf_desc {	ibdbitsu_t ibd_bits;		/* Status and Control */	uint ibd_datlen;		/* Data length in buffer */	uint ibd_sbuf;			/* Source buffer addr in host mem */	uint ibd_dbuf;			/* Destination buffer addr in host mem */} ibd_t;#pragma pack(1)typedef struct dcmbits {	unsigned b_fb:1;	unsigned b_lp:1;	unsigned b_resv1:3;	unsigned b_tc2:1;	unsigned b_resv2:1;	unsigned b_wrap:3;	unsigned b_sinc:1;	unsigned b_dinc:1;	unsigned b_erm:1;	unsigned b_dt:1;	unsigned b_sd:2;} dcmbits_t;#pragma pack(1)typedef union dcmbitsu {	dcmbits_t b;	ushort i;} dcmbitsu_t;#pragma pack(1)typedef struct pram_idma {	ushort pi_ibase;	dcmbitsu_t pi_dcmbits;	ushort pi_ibdptr;	ushort pi_dprbuf;	ushort pi_bufinv;		/* internal to CPM */	ushort pi_ssmax;	ushort pi_dprinptr;		/* internal to CPM */	ushort pi_sts;	ushort pi_dproutptr;		/* internal to CPM */	ushort pi_seob;	ushort pi_deob;	ushort pi_dts;	ushort pi_retadd;	ushort pi_resv1;		/* internal to CPM */	uint pi_bdcnt;	uint pi_sptr;	uint pi_dptr;	uint pi_istate;} pram_idma_t;volatile immap_t *immap = (immap_t *) CFG_IMMR;volatile ibd_t *bdf;volatile pram_idma_t *piptr;volatile int dmadone;volatile int *dmadonep = &dmadone;void dmadone_handler (void *);int idma_init (void);void idma_start (int, int, int, uint, uint, int);uint dpalloc (uint, uint);uint dpinit_done = 0;#ifdef STANDALONEint ctrlc (void){	if (tstc()) {		switch (getc ()) {		case 0x03:		/* ^C - Control C */			return 1;		default:			break;		}	}	return 0;}void * memset(void * s,int c,size_t count){	char *xs = (char *) s;	while (count--)		*xs++ = c;	return s;}int memcmp(const void * cs,const void * ct,size_t count){	const unsigned char *su1, *su2;	int res = 0;	for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)		if ((res = *su1 - *su2) != 0)			break;	return res;}#endif	/* STANDALONE */#ifdef STANDALONEint mem_to_mem_idma2intr (int argc, char *argv[])#elseint do_idma (bd_t * bd, int argc, char *argv[])#endif	/* STANDALONE */{	int i;	app_startup(argv);	dpinit_done = 0;	idma_init ();	DEBUG ("Installing dma handler\n");	install_hdlr (7, dmadone_handler, (void *) bdf);	memset ((void *) 0x100000, 'a', 512);	memset ((void *) 0x200000, 'b', 512);	for (i = 0; i < 32; i++) {		printf ("Startin IDMA, iteration=%d\n", i);		idma_start (1, 1, 512, 0x100000, 0x200000, 3);	}	DEBUG ("Uninstalling dma handler\n");	free_hdlr (7);	return 0;}voididma_start (int sinc, int dinc, int sz, uint sbuf, uint dbuf, int ttype){	/* ttype is for M-M, M-P, P-M or P-P: not used for now */	piptr->pi_istate = 0;	/* manual says: clear it before every START_IDMA */	piptr->pi_dcmbits.b.b_resv1 = 0;	if (sinc == 1)		piptr->pi_dcmbits.b.b_sinc = 1;	else		piptr->pi_dcmbits.b.b_sinc = 0;	if (dinc == 1)		piptr->pi_dcmbits.b.b_dinc = 1;	else		piptr->pi_dcmbits.b.b_dinc = 0;	piptr->pi_dcmbits.b.b_erm = 0;	piptr->pi_dcmbits.b.b_sd = 0x00;	/* M-M */	bdf->ibd_sbuf = sbuf;	bdf->ibd_dbuf = dbuf;	bdf->ibd_bits.b.b_cm = 0;	bdf->ibd_bits.b.b_interrupt = 1;	bdf->ibd_bits.b.b_wrap = 1;	bdf->ibd_bits.b.b_last = 1;	bdf->ibd_bits.b.b_sdn = 0;	bdf->ibd_bits.b.b_ddn = 0;	bdf->ibd_bits.b.b_dgbl = 0;	bdf->ibd_bits.b.b_ddtb = 0;	bdf->ibd_bits.b.b_sgbl = 0;	bdf->ibd_bits.b.b_sdtb = 0;	bdf->ibd_bits.b.b_dbo = 1;	bdf->ibd_bits.b.b_sbo = 1;	bdf->ibd_bits.b.b_valid = 1;	bdf->ibd_datlen = 512;	*dmadonep = 0;	immap->im_sdma.sdma_idmr2 = (uchar) 0xf;	immap->im_cpm.cp_cpcr = mk_cr_cmd (CPM_CR_IDMA2_PAGE,					   CPM_CR_IDMA2_SBLOCK, 0x0,					   0x9) | 0x00010000;	while (*dmadonep != 1) {		if (ctrlc ()) {			DEBUG ("\nInterrupted waiting for DMA interrupt.\n");			goto done;		}		printf ("Waiting for DMA interrupt (dmadone=%d b_valid = %d)...\n",			dmadone, bdf->ibd_bits.b.b_valid);		udelay (1000000);	}	printf ("DMA complete notification received!\n");  done:	DEBUG ("memcmp(0x%08x, 0x%08x, 512) = %d\n",		sbuf, dbuf, memcmp ((void *) sbuf, (void *) dbuf, 512));	return;}#define MAX_INT_BUFSZ	64#define DCM_WRAP	 0	/* MUST be consistant with MAX_INT_BUFSZ */int idma_init (void){	uint memaddr;	immap->im_cpm.cp_rccr &= ~0x00F3FFFF;	immap->im_cpm.cp_rccr |= 0x00A00A00;	memaddr = dpalloc (sizeof (pram_idma_t), 64);	*(volatile ushort *) &immap->im_dprambase[PROFF_IDMA2_BASE] = memaddr;	piptr = (volatile pram_idma_t *) ((uint) (immap) + memaddr);	piptr->pi_resv1 = 0;		/* manual says: clear it */	piptr->pi_dcmbits.b.b_fb = 0;	piptr->pi_dcmbits.b.b_lp = 1;	piptr->pi_dcmbits.b.b_erm = 0;	piptr->pi_dcmbits.b.b_dt = 0;	memaddr = (uint) dpalloc (sizeof (ibd_t), 64);	piptr->pi_ibase = piptr->pi_ibdptr = (volatile short) memaddr;	bdf = (volatile ibd_t *) ((uint) (immap) + memaddr);	bdf->ibd_bits.b.b_valid = 0;	memaddr = (uint) dpalloc (64, 64);	piptr->pi_dprbuf = (volatile ushort) memaddr;	piptr->pi_dcmbits.b.b_wrap = 4;	piptr->pi_ssmax = 32;	piptr->pi_sts = piptr->pi_ssmax;	piptr->pi_dts = piptr->pi_ssmax;	return 1;}void dmadone_handler (void *arg){	immap->im_sdma.sdma_idmr2 = (uchar) 0x0;	*dmadonep = 1;	return;}static uint dpbase = 0;uint dpalloc (uint size, uint align){	volatile immap_t *immr = (immap_t *) CFG_IMMR;	uint retloc;	uint align_mask, off;	uint savebase;	/* Pointer to initial global data area */	if (dpinit_done == 0) {		dpbase = gd->dp_alloc_base;		dpinit_done = 1;	}	align_mask = align - 1;	savebase = dpbase;	if ((off = (dpbase & align_mask)) != 0)		dpbase += (align - off);	if ((off = size & align_mask) != 0)		size += align - off;	if ((dpbase + size) >= gd->dp_alloc_top) {		dpbase = savebase;		printf ("dpalloc: ran out of dual port ram!");		return 0;	}	retloc = dpbase;	dpbase += size;	memset ((void *) &immr->im_dprambase[retloc], 0, size);	return (retloc);}