/*
* Copyright (c) 2001 Matthew Fredette
* Copyright (c) 1995 David Jones, Gordon W. Ross
* Copyright (c) 1994 Jarle Greipsland
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the authors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
* 4. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by
* David Jones and Gordon Ross
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This file defines the interface between the machine-dependent
* module and the machine-independent sunscpal.c module.
*/
/*
* The sun2 and sparc use real bus_space.
*/
#if defined(sun2) || defined(__sparc__)
# define SUNSCPAL_USE_BUS_SPACE
#endif
/*
* The sun2 and sparc use real bus_dma.
*/
#if defined(sun2) || defined(__sparc__)
#define SUNSCPAL_USE_BUS_DMA
#endif
/* These are NOT artibtrary, but map to bits in sunscpal_icr */
#define SUNSCPAL_PHASE_DATA_IN (SUNSCPAL_ICR_INPUT_OUTPUT)
#define SUNSCPAL_PHASE_DATA_OUT (0)
#define SUNSCPAL_PHASE_COMMAND (SUNSCPAL_ICR_COMMAND_DATA)
#define SUNSCPAL_PHASE_STATUS (SUNSCPAL_ICR_COMMAND_DATA | \
SUNSCPAL_ICR_INPUT_OUTPUT)
#define SUNSCPAL_PHASE_MSG_IN (SUNSCPAL_ICR_MESSAGE | \
SUNSCPAL_ICR_COMMAND_DATA | \
SUNSCPAL_ICR_INPUT_OUTPUT)
#define SUNSCPAL_PHASE_MSG_OUT (SUNSCPAL_ICR_MESSAGE | \
SUNSCPAL_ICR_COMMAND_DATA)
#define SUNSCPAL_PHASE_UNSPEC1 (SUNSCPAL_ICR_MESSAGE | \
SUNSCPAL_ICR_INPUT_OUTPUT)
#define SUNSCPAL_PHASE_UNSPEC2 (SUNSCPAL_ICR_MESSAGE)
#define SUNSCPAL_BYTE_READ(sc, phase) (((phase) & SUNSCPAL_ICR_COMMAND_DATA) ? \
SUNSCPAL_READ_1(sc, sunscpal_cmd_stat) : \
SUNSCPAL_READ_1(sc, sunscpal_data))
#define SUNSCPAL_BYTE_WRITE(sc, phase, b) do { \
if ((phase) & SUNSCPAL_ICR_COMMAND_DATA) { \
SUNSCPAL_WRITE_1(sc, sunscpal_cmd_stat, b); \
} else { \
SUNSCPAL_WRITE_1(sc, sunscpal_data, b); \
} \
} while(0)
/*
* A mask and a macro for getting the current bus phase.
*/
#define SUNSCPAL_ICR_PHASE_MASK (SUNSCPAL_ICR_MESSAGE | \
SUNSCPAL_ICR_COMMAND_DATA | \
SUNSCPAL_ICR_INPUT_OUTPUT)
#define SUNSCPAL_BUS_PHASE(icr) ((icr) & SUNSCPAL_ICR_PHASE_MASK)
/*
* This illegal phase is used to prevent the PAL from having
* a phase-match condition when we don't want one, such as
* when setting up the DMA engine or whatever...
*/
#define SUNSCPAL_PHASE_INVALID SUNSCPAL_PHASE_UNSPEC1
/*
* Transfers larger than 65535 bytes need to be split-up.
* (The DMA count register is only 16 bits.)
* Make the size an integer multiple of the page size
* to avoid buf/cluster remap problems. (paranoid?)
*/
#define SUNSCPAL_MAX_DMA_LEN 0xE000
#ifdef SUNSCPAL_USE_BUS_DMA
/*
* This structure is used to keep track of mapped DMA requests.
*/
struct sunscpal_dma_handle {
int dh_flags;
#define SUNSCDH_BUSY 0x01 /* This DH is in use */
uint8_t * dh_mapaddr; /* Original data pointer */
int dh_maplen; /* Original data length */
bus_dmamap_t dh_dmamap;
#define dh_dvma dh_dmamap->dm_segs[0].ds_addr /* VA of buffer in DVMA space */
};
typedef struct sunscpal_dma_handle *sunscpal_dma_handle_t;
#else
typedef void *sunscpal_dma_handle_t;
#endif
/* Per-request state. This is required in order to support reselection. */
struct sunscpal_req {
struct scsipi_xfer *sr_xs; /* Pointer to xfer struct, NULL=unused */
int sr_target, sr_lun; /* For fast access */
sunscpal_dma_handle_t sr_dma_hand; /* Current DMA handle */
uint8_t *sr_dataptr; /* Saved data pointer */
int sr_datalen;
int sr_flags; /* Internal error code */
#define SR_IMMED 1 /* Immediate command */
#define SR_OVERDUE 2 /* Timeout while not current */
#define SR_ERROR 4 /* Error occurred */
int sr_status; /* Status code from last cmd */
};
#define SUNSCPAL_OPENINGS 16 /* How many commands we can enqueue. */
int sc_flags; /* Misc. flags and capabilities */
#define SUNSCPAL_DISABLE_DMA 1 /* Do not use DMA. */
/* Set bits in this to disable parity for some target. */
int sc_parity_disable;
int sc_min_dma_len; /* Smaller than this is done with PIO */
/* Begin MI shared data */
int sc_state;
#define SUNSCPAL_IDLE 0 /* Ready for new work. */
#define SUNSCPAL_WORKING 0x01 /* Some command is in progress. */
#define SUNSCPAL_ABORTING 0x02 /* Bailing out */
#define SUNSCPAL_DOINGDMA 0x04 /* The FIFO data path is active! */
#define SUNSCPAL_DROP_MSGIN 0x10 /* Discard all msgs (parity err detected) */
/* The request that has the bus now. */
struct sunscpal_req *sc_current;
/* Active data pointer for current SCSI command. */
uint8_t *sc_dataptr;
int sc_datalen;
int sc_reqlen;
/* Begin MI private data */
/* The number of operations in progress on the bus */
volatile int sc_ncmds;
/* Ring buffer of pending/active requests */
struct sunscpal_req sc_ring[SUNSCPAL_OPENINGS];
int sc_rr; /* Round-robin scan pointer */
/* Active requests, by target/LUN */
struct sunscpal_req *sc_matrix[8][8];
