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pcscp.c revision 1.5.2.2
      1  1.5.2.2  thorpej /*	$NetBSD: pcscp.c,v 1.5.2.2 1999/10/20 20:43:21 thorpej Exp $	*/
      2      1.1  thorpej 
      3      1.1  thorpej /*-
      4      1.1  thorpej  * Copyright (c) 1997, 1998, 1999 The NetBSD Foundation, Inc.
      5      1.1  thorpej  * All rights reserved.
      6      1.1  thorpej  *
      7      1.1  thorpej  * This code is derived from software contributed to The NetBSD Foundation
      8      1.1  thorpej  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
      9      1.1  thorpej  * NASA Ames Research Center; Izumi Tsutsui.
     10      1.1  thorpej  *
     11      1.1  thorpej  * Redistribution and use in source and binary forms, with or without
     12      1.1  thorpej  * modification, are permitted provided that the following conditions
     13      1.1  thorpej  * are met:
     14      1.1  thorpej  * 1. Redistributions of source code must retain the above copyright
     15      1.1  thorpej  *    notice, this list of conditions and the following disclaimer.
     16      1.1  thorpej  * 2. Redistributions in binary form must reproduce the above copyright
     17      1.1  thorpej  *    notice, this list of conditions and the following disclaimer in the
     18      1.1  thorpej  *    documentation and/or other materials provided with the distribution.
     19      1.1  thorpej  * 3. All advertising materials mentioning features or use of this software
     20      1.1  thorpej  *    must display the following acknowledgement:
     21      1.1  thorpej  *	This product includes software developed by the NetBSD
     22      1.1  thorpej  *	Foundation, Inc. and its contributors.
     23      1.1  thorpej  * 4. Neither the name of The NetBSD Foundation nor the names of its
     24      1.1  thorpej  *    contributors may be used to endorse or promote products derived
     25      1.1  thorpej  *    from this software without specific prior written permission.
     26      1.1  thorpej  *
     27      1.1  thorpej  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     28      1.1  thorpej  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     29      1.1  thorpej  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     30      1.1  thorpej  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     31      1.1  thorpej  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     32      1.1  thorpej  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     33      1.1  thorpej  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     34      1.1  thorpej  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     35      1.1  thorpej  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     36      1.1  thorpej  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     37      1.1  thorpej  * POSSIBILITY OF SUCH DAMAGE.
     38      1.1  thorpej  */
     39      1.1  thorpej 
     40      1.1  thorpej /*
     41      1.1  thorpej  * pcscp.c: device dependent code for AMD Am53c974 (PCscsi-PCI)
     42      1.1  thorpej  * written by Izumi Tsutsui <tsutsui (at) ceres.dti.ne.jp>
     43      1.1  thorpej  *
     44      1.1  thorpej  * Technical manual available at
     45      1.3  thorpej  * http://www.amd.com/products/npd/techdocs/techdocs.html
     46      1.1  thorpej  */
     47      1.1  thorpej 
     48      1.1  thorpej #include <sys/param.h>
     49      1.1  thorpej #include <sys/systm.h>
     50      1.1  thorpej #include <sys/device.h>
     51      1.1  thorpej #include <sys/buf.h>
     52      1.1  thorpej 
     53      1.1  thorpej #include <machine/bus.h>
     54      1.1  thorpej #include <machine/intr.h>
     55      1.3  thorpej #if BYTE_ORDER == BIG_ENDIAN
     56      1.3  thorpej #include <machine/bswap.h>
     57      1.3  thorpej #endif
     58      1.1  thorpej 
     59      1.1  thorpej #include <dev/scsipi/scsi_all.h>
     60      1.1  thorpej #include <dev/scsipi/scsipi_all.h>
     61      1.1  thorpej #include <dev/scsipi/scsiconf.h>
     62      1.1  thorpej #include <dev/scsipi/scsi_message.h>
     63      1.1  thorpej 
     64      1.1  thorpej #include <dev/pci/pcireg.h>
     65      1.1  thorpej #include <dev/pci/pcivar.h>
     66      1.1  thorpej #include <dev/pci/pcidevs.h>
     67      1.1  thorpej 
     68      1.1  thorpej #include <dev/ic/ncr53c9xreg.h>
     69      1.1  thorpej #include <dev/ic/ncr53c9xvar.h>
     70      1.1  thorpej 
     71      1.1  thorpej #include <dev/pci/pcscpreg.h>
     72      1.1  thorpej 
     73      1.1  thorpej #define IO_MAP_REG	0x10
     74      1.1  thorpej #define MEM_MAP_REG	0x14
     75      1.1  thorpej 
     76      1.1  thorpej struct pcscp_softc {
     77      1.1  thorpej 	struct ncr53c9x_softc sc_ncr53c9x;	/* glue to MI code */
     78      1.1  thorpej 
     79      1.1  thorpej 	bus_space_tag_t sc_st;		/* bus space tag */
     80      1.1  thorpej 	bus_space_handle_t sc_sh;	/* bus space handle */
     81      1.1  thorpej 	void *sc_ih;			/* interrupt cookie */
     82      1.1  thorpej 
     83      1.1  thorpej 	bus_dma_tag_t sc_dmat;		/* DMA tag */
     84      1.1  thorpej 
     85      1.1  thorpej 	bus_dmamap_t sc_xfermap;	/* DMA map for transfers */
     86      1.1  thorpej 
     87      1.1  thorpej 	u_int32_t *sc_mdladdr;		/* MDL array */
     88      1.1  thorpej 	bus_dmamap_t sc_mdldmap;	/* MDL DMA map */
     89      1.1  thorpej 
     90      1.1  thorpej 	int	sc_active;		/* DMA state */
     91      1.1  thorpej 	int	sc_datain;		/* DMA Data Direction */
     92      1.1  thorpej 	size_t	sc_dmasize;		/* DMA size */
     93      1.1  thorpej 	char	**sc_dmaaddr;		/* DMA address */
     94      1.1  thorpej 	size_t	*sc_dmalen;		/* DMA length */
     95      1.1  thorpej };
     96      1.1  thorpej 
     97      1.1  thorpej #define	READ_DMAREG(sc, reg) \
     98      1.1  thorpej 	bus_space_read_4((sc)->sc_st, (sc)->sc_sh, (reg))
     99      1.1  thorpej #define	WRITE_DMAREG(sc, reg, var) \
    100      1.1  thorpej 	bus_space_write_4((sc)->sc_st, (sc)->sc_sh, (reg), (var))
    101      1.1  thorpej 
    102      1.1  thorpej /* don't have to use MI defines in MD code... */
    103      1.1  thorpej #undef	NCR_READ_REG
    104      1.1  thorpej #define NCR_READ_REG(sc, reg)		pcscp_read_reg((sc), (reg))
    105      1.1  thorpej #undef	NCR_WRITE_REG
    106      1.1  thorpej #define NCR_WRITE_REG(sc, reg, val)	pcscp_write_reg((sc), (reg), (val))
    107      1.1  thorpej 
    108      1.1  thorpej int	pcscp_match __P((struct device *, struct cfdata *, void *));
    109      1.1  thorpej void	pcscp_attach __P((struct device *, struct device *, void *));
    110      1.1  thorpej 
    111      1.1  thorpej struct cfattach pcscp_ca = {
    112      1.1  thorpej 	sizeof(struct pcscp_softc), pcscp_match, pcscp_attach
    113      1.1  thorpej };
    114      1.1  thorpej 
    115      1.1  thorpej /*
    116      1.1  thorpej  * Functions and the switch for the MI code.
    117      1.1  thorpej  */
    118      1.1  thorpej 
    119      1.1  thorpej u_char	pcscp_read_reg __P((struct ncr53c9x_softc *, int));
    120      1.1  thorpej void	pcscp_write_reg __P((struct ncr53c9x_softc *, int, u_char));
    121      1.1  thorpej int	pcscp_dma_isintr __P((struct ncr53c9x_softc *));
    122      1.1  thorpej void	pcscp_dma_reset __P((struct ncr53c9x_softc *));
    123      1.1  thorpej int	pcscp_dma_intr __P((struct ncr53c9x_softc *));
    124      1.1  thorpej int	pcscp_dma_setup __P((struct ncr53c9x_softc *, caddr_t *,
    125      1.1  thorpej 			       size_t *, int, size_t *));
    126      1.1  thorpej void	pcscp_dma_go __P((struct ncr53c9x_softc *));
    127      1.1  thorpej void	pcscp_dma_stop __P((struct ncr53c9x_softc *));
    128      1.1  thorpej int	pcscp_dma_isactive __P((struct ncr53c9x_softc *));
    129      1.1  thorpej 
    130      1.1  thorpej struct ncr53c9x_glue pcscp_glue = {
    131      1.1  thorpej 	pcscp_read_reg,
    132      1.1  thorpej 	pcscp_write_reg,
    133      1.1  thorpej 	pcscp_dma_isintr,
    134      1.1  thorpej 	pcscp_dma_reset,
    135      1.1  thorpej 	pcscp_dma_intr,
    136      1.1  thorpej 	pcscp_dma_setup,
    137      1.1  thorpej 	pcscp_dma_go,
    138      1.1  thorpej 	pcscp_dma_stop,
    139      1.1  thorpej 	pcscp_dma_isactive,
    140      1.1  thorpej 	NULL,			/* gl_clear_latched_intr */
    141      1.1  thorpej };
    142      1.1  thorpej 
    143      1.1  thorpej int
    144      1.1  thorpej pcscp_match(parent, match, aux)
    145      1.1  thorpej 	struct device *parent;
    146      1.1  thorpej 	struct cfdata *match;
    147      1.1  thorpej 	void *aux;
    148      1.1  thorpej {
    149      1.1  thorpej 	struct pci_attach_args *pa = aux;
    150      1.1  thorpej 	if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_AMD)
    151      1.1  thorpej 		return 0;
    152      1.1  thorpej 
    153      1.1  thorpej 	switch (PCI_PRODUCT(pa->pa_id)) {
    154      1.1  thorpej 	case PCI_PRODUCT_AMD_PCSCSI_PCI:
    155      1.1  thorpej #if 0
    156      1.1  thorpej 	case PCI_PRODUCT_AMD_PCNETS_PCI:
    157      1.1  thorpej #endif
    158      1.1  thorpej 		return 1;
    159      1.1  thorpej 	}
    160      1.1  thorpej 	return 0;
    161      1.1  thorpej }
    162      1.1  thorpej 
    163      1.1  thorpej /*
    164      1.1  thorpej  * Attach this instance, and then all the sub-devices
    165      1.1  thorpej  */
    166      1.1  thorpej void
    167      1.1  thorpej pcscp_attach(parent, self, aux)
    168      1.1  thorpej 	struct device *parent, *self;
    169      1.1  thorpej 	void *aux;
    170      1.1  thorpej {
    171      1.1  thorpej 	struct pci_attach_args *pa = aux;
    172      1.1  thorpej 	struct pcscp_softc *esc = (void *)self;
    173      1.1  thorpej 	struct ncr53c9x_softc *sc = &esc->sc_ncr53c9x;
    174      1.1  thorpej 	bus_space_tag_t st, iot, memt;
    175      1.1  thorpej 	bus_space_handle_t sh, ioh, memh;
    176      1.1  thorpej 	int ioh_valid, memh_valid;
    177      1.1  thorpej 	pci_intr_handle_t ih;
    178      1.1  thorpej 	const char *intrstr;
    179      1.1  thorpej 	pcireg_t csr;
    180      1.1  thorpej 	bus_dma_segment_t seg;
    181      1.1  thorpej 	int error, rseg;
    182      1.1  thorpej 
    183      1.1  thorpej 	ioh_valid = (pci_mapreg_map(pa, IO_MAP_REG,
    184      1.1  thorpej 	    PCI_MAPREG_TYPE_IO, 0,
    185      1.1  thorpej 	    &iot, &ioh, NULL, NULL) == 0);
    186      1.1  thorpej #if 0	/* XXX cannot use memory map? */
    187      1.1  thorpej 	memh_valid = (pci_mapreg_map(pa, MEM_MAP_REG,
    188      1.1  thorpej 	    PCI_MAPREG_TYPE_MEM | PCI_MAPREG_MEM_TYPE_32BIT, 0,
    189      1.1  thorpej 	    &memt, &memh, NULL, NULL) == 0);
    190      1.1  thorpej #else
    191      1.1  thorpej 	memh_valid = 0;
    192      1.1  thorpej #endif
    193      1.1  thorpej 
    194      1.1  thorpej 	if (memh_valid) {
    195      1.1  thorpej 		st = memt;
    196      1.1  thorpej 		sh = memh;
    197      1.1  thorpej 	} else if (ioh_valid) {
    198      1.1  thorpej 		st = iot;
    199      1.1  thorpej 		sh = ioh;
    200      1.1  thorpej 	} else {
    201      1.1  thorpej 		printf(": unable to map registers\n");
    202      1.1  thorpej 		return;
    203      1.1  thorpej 	}
    204      1.1  thorpej 	printf("\n");
    205      1.1  thorpej 
    206      1.1  thorpej 	sc->sc_glue = &pcscp_glue;
    207      1.1  thorpej 
    208      1.1  thorpej 	esc->sc_st = st;
    209      1.1  thorpej 	esc->sc_sh = sh;
    210      1.1  thorpej 	esc->sc_dmat = pa->pa_dmat;
    211      1.1  thorpej 
    212      1.1  thorpej 	csr = pci_conf_read(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG);
    213      1.1  thorpej 	pci_conf_write(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG,
    214      1.1  thorpej 	    csr | PCI_COMMAND_MASTER_ENABLE | PCI_COMMAND_IO_ENABLE);
    215      1.1  thorpej 
    216      1.1  thorpej 	/*
    217      1.1  thorpej 	 * XXX More of this should be in ncr53c9x_attach(), but
    218      1.1  thorpej 	 * XXX should we really poke around the chip that much in
    219      1.1  thorpej 	 * XXX the MI code?  Think about this more...
    220      1.1  thorpej 	 */
    221      1.1  thorpej 
    222      1.1  thorpej 	/*
    223      1.1  thorpej 	 * Set up static configuration info.
    224      1.1  thorpej 	 */
    225      1.1  thorpej 
    226      1.1  thorpej 	/*
    227      1.1  thorpej 	 * XXX should read configuration from EEPROM?
    228      1.1  thorpej 	 *
    229      1.1  thorpej 	 * MI ncr53c9x driver does not support configuration
    230      1.1  thorpej 	 * per each target device, though...
    231      1.1  thorpej 	 */
    232      1.1  thorpej 	sc->sc_id = 7;
    233      1.1  thorpej 	sc->sc_cfg1 = sc->sc_id | NCRCFG1_PARENB;
    234      1.1  thorpej 	sc->sc_cfg2 = NCRCFG2_SCSI2 | NCRCFG2_FE;
    235      1.1  thorpej 	sc->sc_cfg3 = NCRAMDCFG3_IDM | NCRAMDCFG3_FCLK;
    236      1.1  thorpej 	sc->sc_rev = NCR_VARIANT_AM53C974;
    237      1.1  thorpej 	sc->sc_features = NCR_F_FASTSCSI;
    238      1.4   mhitch 	sc->sc_cfg3_fscsi = NCRAMDCFG3_FSCSI;
    239      1.1  thorpej 	sc->sc_freq = 40; /* MHz */
    240      1.1  thorpej 
    241      1.1  thorpej 	/*
    242      1.1  thorpej 	 * XXX minsync and maxxfer _should_ be set up in MI code,
    243      1.1  thorpej 	 * XXX but it appears to have some dependency on what sort
    244      1.1  thorpej 	 * XXX of DMA we're hooked up to, etc.
    245      1.1  thorpej 	 */
    246      1.1  thorpej 
    247      1.1  thorpej 	/*
    248      1.1  thorpej 	 * This is the value used to start sync negotiations
    249      1.1  thorpej 	 * Note that the NCR register "SYNCTP" is programmed
    250      1.1  thorpej 	 * in "clocks per byte", and has a minimum value of 4.
    251      1.1  thorpej 	 * The SCSI period used in negotiation is one-fourth
    252      1.1  thorpej 	 * of the time (in nanoseconds) needed to transfer one byte.
    253      1.1  thorpej 	 * Since the chip's clock is given in MHz, we have the following
    254      1.1  thorpej 	 * formula: 4 * period = (1000 / freq) * 4
    255      1.1  thorpej 	 */
    256      1.1  thorpej 
    257      1.1  thorpej 	sc->sc_minsync = 1000 / sc->sc_freq;
    258      1.1  thorpej 
    259      1.1  thorpej 	/* Really no limit, but since we want to fit into the TCR... */
    260      1.1  thorpej 	sc->sc_maxxfer = 16 * 1024 * 1024;
    261      1.1  thorpej 
    262      1.1  thorpej 	/* map and establish interrupt */
    263      1.1  thorpej 	if (pci_intr_map(pa->pa_pc, pa->pa_intrtag, pa->pa_intrpin,
    264      1.1  thorpej 			 pa->pa_intrline, &ih)) {
    265      1.1  thorpej 		printf("%s: couldn't map interrupt\n", sc->sc_dev.dv_xname);
    266      1.1  thorpej 		return;
    267      1.1  thorpej 	}
    268      1.1  thorpej 
    269      1.1  thorpej 	intrstr = pci_intr_string(pa->pa_pc, ih);
    270      1.1  thorpej 	esc->sc_ih = pci_intr_establish(pa->pa_pc, ih, IPL_BIO,
    271      1.1  thorpej 					(int (*)(void *))ncr53c9x_intr, esc);
    272      1.1  thorpej 	if (esc->sc_ih == NULL) {
    273      1.1  thorpej 		printf("%s: couldn't establish interrupt", sc->sc_dev.dv_xname);
    274      1.1  thorpej 		if (intrstr != NULL)
    275      1.1  thorpej 			printf(" at %s", intrstr);
    276      1.1  thorpej 		printf("\n");
    277      1.1  thorpej 		return;
    278      1.1  thorpej 	}
    279      1.1  thorpej 	if (intrstr != NULL)
    280      1.1  thorpej 		printf("%s: interrupting at %s\n", sc->sc_dev.dv_xname,
    281      1.1  thorpej 		       intrstr);
    282      1.1  thorpej 
    283      1.1  thorpej 	/*
    284      1.1  thorpej 	 * Create the DMA maps for the data transfers.
    285      1.1  thorpej          */
    286      1.1  thorpej 
    287      1.1  thorpej #define MDL_SEG_SIZE	0x1000 /* 4kbyte per segment */
    288      1.1  thorpej #define MDL_SEG_OFFSET	0x0FFF
    289      1.1  thorpej #define MDL_SIZE	(MAXPHYS / MDL_SEG_SIZE + 1) /* no hardware limit? */
    290      1.1  thorpej 
    291      1.1  thorpej 	if (bus_dmamap_create(esc->sc_dmat, MAXPHYS, MDL_SIZE, MAXPHYS, 0,
    292      1.1  thorpej 	    BUS_DMA_NOWAIT, &esc->sc_xfermap)) {
    293      1.1  thorpej 		printf("%s: can't create dma maps\n", sc->sc_dev.dv_xname);
    294      1.1  thorpej 		return;
    295      1.1  thorpej 	}
    296      1.1  thorpej 
    297      1.1  thorpej 	/*
    298      1.1  thorpej 	 * Allocate and map memory for the MDL.
    299      1.1  thorpej 	 */
    300      1.1  thorpej 
    301      1.1  thorpej 	if ((error = bus_dmamem_alloc(esc->sc_dmat,
    302      1.1  thorpej 	    sizeof(u_int32_t) * MDL_SIZE, NBPG, 0, &seg, 1, &rseg,
    303      1.1  thorpej 	    BUS_DMA_NOWAIT)) != 0) {
    304      1.1  thorpej 		printf("%s: unable to allocate memory for the MDL, "
    305      1.1  thorpej 		    "error = %d\n", sc->sc_dev.dv_xname, error);
    306      1.1  thorpej 		return;
    307      1.1  thorpej 	}
    308      1.1  thorpej 	if ((error = bus_dmamem_map(esc->sc_dmat, &seg, rseg,
    309      1.1  thorpej 	    sizeof(u_int32_t) * MDL_SIZE , (caddr_t *)&esc->sc_mdladdr,
    310      1.1  thorpej 	    BUS_DMA_NOWAIT|BUS_DMA_COHERENT)) != 0) {
    311      1.1  thorpej 		printf("%s: unable to map the MDL memory, error = %d\n",
    312      1.1  thorpej 		       sc->sc_dev.dv_xname, error);
    313      1.1  thorpej 		return;
    314      1.1  thorpej 	}
    315      1.1  thorpej 	if ((error = bus_dmamap_create(esc->sc_dmat,
    316      1.1  thorpej 	    sizeof(u_int32_t) * MDL_SIZE, 1, sizeof(u_int32_t) * MDL_SIZE,
    317      1.1  thorpej 	    0, BUS_DMA_NOWAIT, &esc->sc_mdldmap)) != 0) {
    318      1.1  thorpej 		printf("%s: unable to map_create for the MDL, error = %d\n",
    319      1.1  thorpej 		       sc->sc_dev.dv_xname, error);
    320      1.1  thorpej 		return;
    321      1.1  thorpej 	}
    322      1.1  thorpej 	if ((error = bus_dmamap_load(esc->sc_dmat, esc->sc_mdldmap,
    323      1.1  thorpej 	     esc->sc_mdladdr, sizeof(u_int32_t) * MDL_SIZE,
    324      1.1  thorpej 	     NULL, BUS_DMA_NOWAIT)) != 0) {
    325      1.1  thorpej 		printf("%s: unable to load for the MDL, error = %d\n",
    326      1.1  thorpej 		       sc->sc_dev.dv_xname, error);
    327      1.1  thorpej 		return;
    328      1.1  thorpej 	}
    329      1.1  thorpej 
    330  1.5.2.1  thorpej 	/* Turn on target selection using the `dma' method */
    331  1.5.2.1  thorpej 	ncr53c9x_dmaselect = 1;
    332  1.5.2.1  thorpej 
    333      1.1  thorpej 	/* Do the common parts of attachment. */
    334      1.1  thorpej 	printf("%s", sc->sc_dev.dv_xname);
    335      1.1  thorpej 
    336  1.5.2.1  thorpej 	sc->sc_adapter.adapt_request = ncr53c9x_scsipi_request;
    337  1.5.2.1  thorpej 	sc->sc_adapter.adapt_minphys = minphys;
    338      1.1  thorpej 
    339  1.5.2.1  thorpej 	ncr53c9x_attach(sc);
    340      1.1  thorpej }
    341      1.1  thorpej 
    342      1.1  thorpej /*
    343      1.1  thorpej  * Glue functions.
    344      1.1  thorpej  */
    345      1.1  thorpej 
    346      1.1  thorpej u_char
    347      1.1  thorpej pcscp_read_reg(sc, reg)
    348      1.1  thorpej 	struct ncr53c9x_softc *sc;
    349      1.1  thorpej 	int reg;
    350      1.1  thorpej {
    351      1.1  thorpej 	struct pcscp_softc *esc = (struct pcscp_softc *)sc;
    352      1.1  thorpej 
    353      1.1  thorpej 	return bus_space_read_1(esc->sc_st, esc->sc_sh, reg << 2);
    354      1.1  thorpej }
    355      1.1  thorpej 
    356      1.1  thorpej void
    357      1.1  thorpej pcscp_write_reg(sc, reg, v)
    358      1.1  thorpej 	struct ncr53c9x_softc *sc;
    359      1.1  thorpej 	int reg;
    360      1.1  thorpej 	u_char v;
    361      1.1  thorpej {
    362      1.1  thorpej 	struct pcscp_softc *esc = (struct pcscp_softc *)sc;
    363      1.1  thorpej 
    364      1.1  thorpej 	bus_space_write_1(esc->sc_st, esc->sc_sh, reg << 2, v);
    365      1.1  thorpej }
    366      1.1  thorpej 
    367      1.1  thorpej int
    368      1.1  thorpej pcscp_dma_isintr(sc)
    369      1.1  thorpej 	struct ncr53c9x_softc *sc;
    370      1.1  thorpej {
    371      1.1  thorpej 
    372      1.1  thorpej 	return NCR_READ_REG(sc, NCR_STAT) & NCRSTAT_INT;
    373      1.1  thorpej }
    374      1.1  thorpej 
    375      1.1  thorpej void
    376      1.1  thorpej pcscp_dma_reset(sc)
    377      1.1  thorpej 	struct ncr53c9x_softc *sc;
    378      1.1  thorpej {
    379      1.1  thorpej 	struct pcscp_softc *esc = (struct pcscp_softc *)sc;
    380      1.1  thorpej 
    381      1.1  thorpej 	WRITE_DMAREG(esc, DMA_CMD, DMACMD_IDLE);
    382      1.1  thorpej 
    383      1.1  thorpej 	esc->sc_active = 0;
    384      1.1  thorpej }
    385      1.1  thorpej 
    386      1.1  thorpej int
    387      1.1  thorpej pcscp_dma_intr(sc)
    388      1.1  thorpej 	struct ncr53c9x_softc *sc;
    389      1.1  thorpej {
    390      1.1  thorpej 	struct pcscp_softc *esc = (struct pcscp_softc *)sc;
    391      1.1  thorpej 	int trans, resid, i;
    392      1.1  thorpej 	bus_dmamap_t dmap = esc->sc_xfermap;
    393      1.1  thorpej 	int datain = esc->sc_datain;
    394      1.1  thorpej 	u_int32_t dmastat;
    395      1.1  thorpej 	char *p = NULL;
    396      1.1  thorpej 
    397      1.1  thorpej 	dmastat = READ_DMAREG(esc, DMA_STAT);
    398      1.1  thorpej 
    399      1.1  thorpej 	if (dmastat & DMASTAT_ERR) {
    400      1.1  thorpej 		/* XXX not tested... */
    401      1.1  thorpej 		WRITE_DMAREG(esc, DMA_CMD, DMACMD_ABORT |
    402      1.1  thorpej 			     (datain ? DMACMD_DIR : 0));
    403      1.1  thorpej 
    404      1.1  thorpej 		printf("%s: error: DMA error detected; Aborting.\n",
    405      1.1  thorpej 		       sc->sc_dev.dv_xname);
    406      1.1  thorpej 		bus_dmamap_unload(esc->sc_dmat, dmap);
    407      1.1  thorpej 		return -1;
    408      1.1  thorpej 	}
    409      1.1  thorpej 
    410      1.1  thorpej 	if (dmastat & DMASTAT_ABT) {
    411      1.1  thorpej 		/* XXX What should be done? */
    412      1.1  thorpej 		printf("%s: dma_intr: DMA aborted.\n", sc->sc_dev.dv_xname);
    413      1.1  thorpej 		WRITE_DMAREG(esc, DMA_CMD, DMACMD_IDLE |
    414      1.1  thorpej 			     (datain ? DMACMD_DIR : 0));
    415      1.1  thorpej 		esc->sc_active = 0;
    416      1.1  thorpej 		return 0;
    417      1.1  thorpej 	}
    418      1.1  thorpej 
    419      1.1  thorpej 	/* This is an "assertion" :) */
    420      1.1  thorpej 	if (esc->sc_active == 0)
    421      1.1  thorpej 		panic("pcscp dmaintr: DMA wasn't active");
    422      1.1  thorpej 
    423      1.1  thorpej 	/* DMA has stopped */
    424      1.1  thorpej 
    425      1.1  thorpej 	esc->sc_active = 0;
    426      1.1  thorpej 
    427      1.1  thorpej 	if (esc->sc_dmasize == 0) {
    428      1.1  thorpej 		/* A "Transfer Pad" operation completed */
    429      1.1  thorpej 		NCR_DMA(("dmaintr: discarded %d bytes (tcl=%d, tcm=%d)\n",
    430      1.1  thorpej 			NCR_READ_REG(sc, NCR_TCL) |
    431      1.1  thorpej 				(NCR_READ_REG(sc, NCR_TCM) << 8),
    432      1.1  thorpej 			NCR_READ_REG(sc, NCR_TCL),
    433      1.1  thorpej 			NCR_READ_REG(sc, NCR_TCM)));
    434      1.1  thorpej 		return 0;
    435      1.1  thorpej 	}
    436      1.1  thorpej 
    437      1.1  thorpej 	resid = 0;
    438      1.3  thorpej 	/*
    439      1.3  thorpej 	 * If a transfer onto the SCSI bus gets interrupted by the device
    440      1.3  thorpej 	 * (e.g. for a SAVEPOINTER message), the data in the FIFO counts
    441      1.3  thorpej 	 * as residual since the ESP counter registers get decremented as
    442      1.3  thorpej 	 * bytes are clocked into the FIFO.
    443      1.3  thorpej 	 */
    444      1.3  thorpej 	if (!datain &&
    445      1.3  thorpej 	    (resid = (NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF)) != 0) {
    446      1.3  thorpej 		NCR_DMA(("pcscp_dma_intr: empty esp FIFO of %d ", resid));
    447      1.3  thorpej 	}
    448      1.1  thorpej 
    449      1.1  thorpej 	if ((sc->sc_espstat & NCRSTAT_TC) == 0) {
    450      1.1  thorpej 		/*
    451      1.1  thorpej 		 * `Terminal count' is off, so read the residue
    452      1.1  thorpej 		 * out of the ESP counter registers.
    453      1.1  thorpej 		 */
    454      1.1  thorpej 		if (datain) {
    455      1.1  thorpej 			resid = NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF;
    456      1.1  thorpej 			while (resid > 1)
    457      1.1  thorpej 				resid = NCR_READ_REG(sc, NCR_FFLAG) &
    458      1.1  thorpej 					NCRFIFO_FF;
    459      1.1  thorpej 			WRITE_DMAREG(esc, DMA_CMD, DMACMD_BLAST | DMACMD_MDL |
    460      1.1  thorpej 					     (datain ? DMACMD_DIR : 0));
    461      1.1  thorpej 
    462      1.1  thorpej 			for (i = 0; i < 0x8000; i++) /* XXX 0x8000 ? */
    463      1.1  thorpej 				if (READ_DMAREG(esc, DMA_STAT) & DMASTAT_BCMP)
    464      1.1  thorpej 					break;
    465      1.1  thorpej 
    466      1.1  thorpej 			/* See the below comments... */
    467      1.1  thorpej 			if (resid)
    468      1.1  thorpej 				p = *esc->sc_dmaaddr;
    469      1.1  thorpej 		}
    470      1.1  thorpej 
    471      1.1  thorpej 		resid += (NCR_READ_REG(sc, NCR_TCL) |
    472      1.1  thorpej 			  (NCR_READ_REG(sc, NCR_TCM) << 8) |
    473      1.1  thorpej 			  ((sc->sc_cfg2 & NCRCFG2_FE)
    474      1.1  thorpej 				? (NCR_READ_REG(sc, NCR_TCH) << 16) : 0));
    475      1.1  thorpej 
    476      1.1  thorpej 		if (resid == 0 && esc->sc_dmasize == 65536 &&
    477      1.1  thorpej 		    (sc->sc_cfg2 & NCRCFG2_FE) == 0)
    478      1.1  thorpej 			/* A transfer of 64K is encoded as `TCL=TCM=0' */
    479      1.1  thorpej 			resid = 65536;
    480      1.1  thorpej 	} else {
    481      1.1  thorpej 		while((dmastat & DMASTAT_DONE) == 0)
    482      1.1  thorpej 			dmastat = READ_DMAREG(esc, DMA_STAT);
    483      1.1  thorpej 	}
    484      1.1  thorpej 
    485      1.1  thorpej 	WRITE_DMAREG(esc, DMA_CMD, DMACMD_IDLE | (datain ? DMACMD_DIR : 0));
    486      1.1  thorpej 
    487      1.1  thorpej 	bus_dmamap_sync(esc->sc_dmat, dmap, 0, dmap->dm_mapsize,
    488      1.1  thorpej 			datain ? BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
    489      1.1  thorpej 	bus_dmamap_unload(esc->sc_dmat, dmap);
    490      1.1  thorpej 
    491      1.1  thorpej 	trans = esc->sc_dmasize - resid;
    492      1.1  thorpej 
    493      1.1  thorpej 	/*
    494      1.1  thorpej 	 * From the technical manual notes:
    495      1.1  thorpej 	 *
    496      1.1  thorpej 	 * `In some odd byte conditions, one residual byte will be left
    497      1.1  thorpej 	 *  in the SCSI FIFO, and the FIFO flags will never count to 0.
    498      1.1  thorpej 	 *  When this happens, the residual byte should be retrieved
    499      1.1  thorpej 	 *  via PIO following completion of the BLAST operation.'
    500      1.1  thorpej 	 */
    501      1.1  thorpej 
    502      1.1  thorpej 	if (p) {
    503      1.1  thorpej 		p += trans;
    504      1.1  thorpej 		*p = NCR_READ_REG(sc, NCR_FIFO);
    505      1.1  thorpej 		trans++;
    506      1.1  thorpej 	}
    507      1.1  thorpej 
    508      1.1  thorpej 	if (trans < 0) {			/* transferred < 0 ? */
    509      1.1  thorpej #if 0
    510      1.1  thorpej 		/*
    511      1.1  thorpej 		 * This situation can happen in perfectly normal operation
    512      1.1  thorpej 		 * if the ESP is reselected while using DMA to select
    513      1.1  thorpej 		 * another target.  As such, don't print the warning.
    514      1.1  thorpej 		 */
    515      1.1  thorpej 		printf("%s: xfer (%d) > req (%d)\n",
    516      1.1  thorpej 		    sc->sc_dev.dv_xname, trans, esc->sc_dmasize);
    517      1.1  thorpej #endif
    518      1.1  thorpej 		trans = esc->sc_dmasize;
    519      1.1  thorpej 	}
    520      1.1  thorpej 
    521      1.1  thorpej 	NCR_DMA(("dmaintr: tcl=%d, tcm=%d, tch=%d; trans=%d, resid=%d\n",
    522      1.1  thorpej 		NCR_READ_REG(sc, NCR_TCL),
    523      1.1  thorpej 		NCR_READ_REG(sc, NCR_TCM),
    524      1.1  thorpej 		(sc->sc_cfg2 & NCRCFG2_FE)
    525      1.1  thorpej 			? NCR_READ_REG(sc, NCR_TCH) : 0,
    526      1.1  thorpej 			trans, resid));
    527      1.1  thorpej 
    528      1.1  thorpej 	*esc->sc_dmalen -= trans;
    529      1.1  thorpej 	*esc->sc_dmaaddr += trans;
    530      1.1  thorpej 
    531      1.1  thorpej 	return 0;
    532      1.1  thorpej }
    533      1.1  thorpej 
    534      1.1  thorpej int
    535      1.1  thorpej pcscp_dma_setup(sc, addr, len, datain, dmasize)
    536      1.1  thorpej 	struct ncr53c9x_softc *sc;
    537      1.1  thorpej 	caddr_t *addr;
    538      1.1  thorpej 	size_t *len;
    539      1.1  thorpej 	int datain;
    540      1.1  thorpej 	size_t *dmasize;
    541      1.1  thorpej {
    542      1.1  thorpej 	struct pcscp_softc *esc = (struct pcscp_softc *)sc;
    543      1.1  thorpej 	bus_dmamap_t dmap = esc->sc_xfermap;
    544      1.1  thorpej 	u_int32_t *mdl;
    545      1.1  thorpej 	int error, nseg, seg;
    546      1.1  thorpej 	bus_addr_t s_offset, s_addr;
    547      1.1  thorpej 	long rest, count;
    548      1.1  thorpej 
    549      1.1  thorpej 	WRITE_DMAREG(esc, DMA_CMD, DMACMD_IDLE | (datain ? DMACMD_DIR : 0));
    550      1.1  thorpej 
    551      1.1  thorpej 	esc->sc_dmaaddr = addr;
    552      1.1  thorpej 	esc->sc_dmalen = len;
    553      1.1  thorpej 	esc->sc_dmasize = *dmasize;
    554      1.1  thorpej 	esc->sc_datain = datain;
    555      1.1  thorpej 
    556      1.1  thorpej #ifdef DIAGNOSTIC
    557      1.1  thorpej 	if ((*dmasize / MDL_SEG_SIZE) > MDL_SIZE)
    558      1.1  thorpej 		panic("pcscp: transfer size too large");
    559      1.1  thorpej #endif
    560      1.1  thorpej 
    561      1.1  thorpej 	/*
    562      1.3  thorpej 	 * No need to set up DMA in `Transfer Pad' operation.
    563      1.1  thorpej 	 * (case of *dmasize == 0)
    564      1.1  thorpej 	 */
    565      1.3  thorpej 	if (*dmasize == 0)
    566      1.3  thorpej 		return 0;
    567      1.1  thorpej 
    568      1.1  thorpej 	error = bus_dmamap_load(esc->sc_dmat, dmap, *esc->sc_dmaaddr,
    569  1.5.2.2  thorpej 				*esc->sc_dmalen, NULL, BUS_DMA_NOWAIT);
    570  1.5.2.2  thorpej 	switch (error) {
    571  1.5.2.2  thorpej 	case 0:
    572  1.5.2.2  thorpej 		break;
    573  1.5.2.2  thorpej 
    574  1.5.2.2  thorpej 	default:
    575      1.1  thorpej 		printf("%s: unable to load dmamap, error = %d\n",
    576  1.5.2.2  thorpej 		    sc->sc_dev.dv_xname, error);
    577  1.5.2.2  thorpej 		/* FALLTHROUGH */
    578  1.5.2.2  thorpej 
    579  1.5.2.2  thorpej 	case ENOMEM:
    580  1.5.2.2  thorpej 	case EAGAIN:
    581  1.5.2.2  thorpej 		return (error);
    582      1.1  thorpej 	}
    583      1.1  thorpej 
    584      1.1  thorpej 	/* set transfer length */
    585      1.1  thorpej 	WRITE_DMAREG(esc, DMA_STC, *dmasize);
    586      1.1  thorpej 
    587      1.1  thorpej 	/* set up MDL */
    588      1.1  thorpej 	mdl = esc->sc_mdladdr;
    589      1.1  thorpej 	nseg = dmap->dm_nsegs;
    590      1.1  thorpej 	seg = 0;
    591      1.1  thorpej 
    592      1.1  thorpej 	/* the first segment is possibly not aligned with 4k MDL boundary */
    593      1.1  thorpej 	count = dmap->dm_segs[seg].ds_len;
    594      1.1  thorpej 	s_offset = dmap->dm_segs[seg].ds_addr & MDL_SEG_OFFSET;
    595      1.1  thorpej 	s_addr = dmap->dm_segs[seg].ds_addr - s_offset;
    596      1.1  thorpej 	rest = MDL_SEG_SIZE - s_offset;
    597      1.1  thorpej 
    598      1.1  thorpej #if BYTE_ORDER == BIG_ENDIAN
    599      1.1  thorpej #define	htopci(addr)	bswap32(addr)
    600      1.1  thorpej #else
    601      1.1  thorpej #define	htopci(addr)	(addr)
    602      1.1  thorpej #endif
    603      1.1  thorpej 
    604      1.1  thorpej 	/* set the first MDL and offset */
    605      1.1  thorpej 	WRITE_DMAREG(esc, DMA_SPA, s_offset);
    606      1.1  thorpej 	*mdl++ = htopci(s_addr);
    607      1.1  thorpej 	count -= rest;
    608      1.1  thorpej 
    609      1.1  thorpej 	/* rests of the first dmamap segment */
    610      1.1  thorpej 	while (count > 0) {
    611      1.1  thorpej 		s_addr += MDL_SEG_SIZE;
    612      1.1  thorpej 		*mdl++ = htopci(s_addr);
    613      1.1  thorpej 		count -= MDL_SEG_SIZE;
    614      1.1  thorpej 	}
    615      1.1  thorpej 
    616      1.1  thorpej 	/* the rest dmamap segments are aligned with 4k boundary */
    617      1.1  thorpej 	for (seg = 1; seg < nseg; seg++) {
    618      1.1  thorpej 		count = dmap->dm_segs[seg].ds_len;
    619      1.1  thorpej 		s_addr = dmap->dm_segs[seg].ds_addr;
    620      1.1  thorpej 
    621      1.1  thorpej 		/* first 4kbyte of each dmamap segment */
    622      1.1  thorpej 		*mdl++ = htopci(s_addr);
    623      1.1  thorpej 		count -= MDL_SEG_SIZE;
    624      1.1  thorpej 
    625      1.1  thorpej 		/* trailing contiguous 4k frames of each dmamap segments */
    626      1.1  thorpej 		while (count > 0) {
    627      1.1  thorpej 			s_addr += MDL_SEG_SIZE;
    628      1.1  thorpej 			*mdl++ = htopci(s_addr);
    629      1.1  thorpej 			count -= MDL_SEG_SIZE;
    630      1.1  thorpej 		}
    631      1.1  thorpej 	}
    632      1.1  thorpej 
    633      1.1  thorpej #undef htopci
    634      1.1  thorpej 
    635      1.1  thorpej 	return 0;
    636      1.1  thorpej }
    637      1.1  thorpej 
    638      1.1  thorpej void
    639      1.1  thorpej pcscp_dma_go(sc)
    640      1.1  thorpej 	struct ncr53c9x_softc *sc;
    641      1.1  thorpej {
    642      1.1  thorpej 	struct pcscp_softc *esc = (struct pcscp_softc *)sc;
    643      1.1  thorpej 	bus_dmamap_t dmap = esc->sc_xfermap, mdldmap = esc->sc_mdldmap;
    644      1.1  thorpej 	int datain = esc->sc_datain;
    645      1.3  thorpej 
    646      1.3  thorpej 	/* No DMA transfer in Transfer Pad operation */
    647      1.3  thorpej 	if (esc->sc_dmasize == 0)
    648      1.3  thorpej 		return;
    649      1.1  thorpej 
    650      1.1  thorpej 	/* sync transfer buffer */
    651      1.1  thorpej 	bus_dmamap_sync(esc->sc_dmat, dmap, 0, dmap->dm_mapsize,
    652      1.1  thorpej 			datain ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
    653      1.1  thorpej 
    654      1.1  thorpej 	/* sync MDL */
    655      1.1  thorpej 	bus_dmamap_sync(esc->sc_dmat, mdldmap, 0, mdldmap->dm_mapsize,
    656      1.1  thorpej 			BUS_DMASYNC_PREWRITE);
    657      1.1  thorpej 
    658      1.1  thorpej 	/* set Starting MDL Address */
    659      1.2  thorpej 	WRITE_DMAREG(esc, DMA_SMDLA, mdldmap->dm_segs[0].ds_addr);
    660      1.1  thorpej 
    661      1.1  thorpej 	/* set DMA command register bits */
    662      1.1  thorpej 	/* XXX DMA Transfer Interrupt Enable bit is broken? */
    663      1.1  thorpej 	WRITE_DMAREG(esc, DMA_CMD, DMACMD_IDLE | DMACMD_MDL |
    664      1.1  thorpej 		     /* DMACMD_INTE | */
    665      1.1  thorpej 		     (datain ? DMACMD_DIR : 0));
    666      1.1  thorpej 
    667      1.1  thorpej 	/* issue DMA start command */
    668      1.1  thorpej 	WRITE_DMAREG(esc, DMA_CMD, DMACMD_START | DMACMD_MDL |
    669      1.1  thorpej 		     /* DMACMD_INTE | */
    670      1.1  thorpej 		     (datain ? DMACMD_DIR : 0));
    671      1.1  thorpej 
    672      1.1  thorpej 	esc->sc_active = 1;
    673      1.1  thorpej }
    674      1.1  thorpej 
    675      1.1  thorpej void
    676      1.1  thorpej pcscp_dma_stop(sc)
    677      1.1  thorpej 	struct ncr53c9x_softc *sc;
    678      1.1  thorpej {
    679      1.1  thorpej 	struct pcscp_softc *esc = (struct pcscp_softc *)sc;
    680      1.1  thorpej 
    681      1.1  thorpej 	/* dma stop */
    682      1.1  thorpej 	/* XXX What should we do here ? */
    683      1.1  thorpej 	WRITE_DMAREG(esc, DMA_CMD, DMACMD_ABORT |
    684      1.1  thorpej 		     ( esc->sc_datain ? DMACMD_DIR : 0));
    685      1.1  thorpej 
    686      1.1  thorpej 	esc->sc_active = 0;
    687      1.1  thorpej }
    688      1.1  thorpej 
    689      1.1  thorpej int
    690      1.1  thorpej pcscp_dma_isactive(sc)
    691      1.1  thorpej 	struct ncr53c9x_softc *sc;
    692      1.1  thorpej {
    693      1.1  thorpej 	struct pcscp_softc *esc = (struct pcscp_softc *)sc;
    694      1.1  thorpej 
    695      1.1  thorpej 	/* XXX should check esc->sc_active? */
    696      1.1  thorpej 	if ((READ_DMAREG(esc, DMA_CMD) & DMACMD_CMD) != DMACMD_IDLE)
    697      1.1  thorpej 		return 1;
    698      1.1  thorpej 	return 0;
    699      1.1  thorpej }
    700