/*
* NCR 5380 defines
*
* Copyright 1993, Drew Eckhardt
* Visionary Computing
* (Unix consulting and custom programming)
* drew@colorado.edu
* +1 (303) 666-5836
*
* For more information, please consult
*
* NCR 5380 Family
* SCSI Protocol Controller
* Databook
* NCR Microelectronics
* 1635 Aeroplaza Drive
* Colorado Springs, CO 80916
* 1+ (719) 578-3400
* 1+ (800) 334-5454
*/
#ifndef NCR5380_H
#define NCR5380_H
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/workqueue.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_transport_spi.h>
#define NDEBUG_ARBITRATION 0x1
#define NDEBUG_AUTOSENSE 0x2
#define NDEBUG_DMA 0x4
#define NDEBUG_HANDSHAKE 0x8
#define NDEBUG_INFORMATION 0x10
#define NDEBUG_INIT 0x20
#define NDEBUG_INTR 0x40
#define NDEBUG_LINKED 0x80
#define NDEBUG_MAIN 0x100
#define NDEBUG_NO_DATAOUT 0x200
#define NDEBUG_NO_WRITE 0x400
#define NDEBUG_PIO 0x800
#define NDEBUG_PSEUDO_DMA 0x1000
#define NDEBUG_QUEUES 0x2000
#define NDEBUG_RESELECTION 0x4000
#define NDEBUG_SELECTION 0x8000
#define NDEBUG_USLEEP 0x10000
#define NDEBUG_LAST_BYTE_SENT 0x20000
#define NDEBUG_RESTART_SELECT 0x40000
#define NDEBUG_EXTENDED 0x80000
#define NDEBUG_C400_PREAD 0x100000
#define NDEBUG_C400_PWRITE 0x200000
#define NDEBUG_LISTS 0x400000
#define NDEBUG_ABORT 0x800000
#define NDEBUG_TAGS 0x1000000
#define NDEBUG_MERGING 0x2000000
#define NDEBUG_ANY 0xFFFFFFFFUL
/*
* The contents of the OUTPUT DATA register are asserted on the bus when
* either arbitration is occurring or the phase-indicating signals (
* IO, CD, MSG) in the TARGET COMMAND register and the ASSERT DATA
* bit in the INITIATOR COMMAND register is set.
*/
#define OUTPUT_DATA_REG 0 /* wo DATA lines on SCSI bus */
#define CURRENT_SCSI_DATA_REG 0 /* ro same */
#define INITIATOR_COMMAND_REG 1 /* rw */
#define ICR_ASSERT_RST 0x80 /* rw Set to assert RST */
#define ICR_ARBITRATION_PROGRESS 0x40 /* ro Indicates arbitration complete */
#define ICR_TRI_STATE 0x40 /* wo Set to tri-state drivers */
#define ICR_ARBITRATION_LOST 0x20 /* ro Indicates arbitration lost */
#define ICR_DIFF_ENABLE 0x20 /* wo Set to enable diff. drivers */
#define ICR_ASSERT_ACK 0x10 /* rw ini Set to assert ACK */
#define ICR_ASSERT_BSY 0x08 /* rw Set to assert BSY */
#define ICR_ASSERT_SEL 0x04 /* rw Set to assert SEL */
#define ICR_ASSERT_ATN 0x02 /* rw Set to assert ATN */
#define ICR_ASSERT_DATA 0x01 /* rw SCSI_DATA_REG is asserted */
#ifdef DIFFERENTIAL
#define ICR_BASE ICR_DIFF_ENABLE
#else
#define ICR_BASE 0
#endif
#define MODE_REG 2
/*
* Note : BLOCK_DMA code will keep DRQ asserted for the duration of the
* transfer, causing the chip to hog the bus. You probably don't want
* this.
*/
#define MR_BLOCK_DMA_MODE 0x80 /* rw block mode DMA */
#define MR_TARGET 0x40 /* rw target mode */
#define MR_ENABLE_PAR_CHECK 0x20 /* rw enable parity checking */
#define MR_ENABLE_PAR_INTR 0x10 /* rw enable bad parity interrupt */
#define MR_ENABLE_EOP_INTR 0x08 /* rw enable eop interrupt */
#define MR_MONITOR_BSY 0x04 /* rw enable int on unexpected bsy fail */
#define MR_DMA_MODE 0x02 /* rw DMA / pseudo DMA mode */
#define MR_ARBITRATE 0x01 /* rw start arbitration */
#ifdef PARITY
#define MR_BASE MR_ENABLE_PAR_CHECK
#else
#define MR_BASE 0
#endif
#define TARGET_COMMAND_REG 3
#define TCR_LAST_BYTE_SENT 0x80 /* ro DMA done */
#define TCR_ASSERT_REQ 0x08 /* tgt rw assert REQ */
#define TCR_ASSERT_MSG 0x04 /* tgt rw assert MSG */
#define TCR_ASSERT_CD 0x02 /* tgt rw assert CD */
#define TCR_ASSERT_IO 0x01 /* tgt rw assert IO */
#define STATUS_REG 4 /* ro */
/*
* Note : a set bit indicates an active signal, driven by us or another
* device.
*/
#define SR_RST 0x80
#define SR_BSY 0x40
#define SR_REQ 0x20
#define SR_MSG 0x10
#define SR_CD 0x08
#define SR_IO 0x04
#define SR_SEL 0x02
#define SR_DBP 0x01
/*
* Setting a bit in this register will cause an interrupt to be generated when
* BSY is false and SEL true and this bit is asserted on the bus.
*/
#define SELECT_ENABLE_REG 4 /* wo */
#define BUS_AND_STATUS_REG 5 /* ro */
#define BASR_END_DMA_TRANSFER 0x80 /* ro set on end of transfer */
#define BASR_DRQ 0x40 /* ro mirror of DRQ pin */
#define BASR_PARITY_ERROR 0x20 /* ro parity error detected */
#define BASR_IRQ 0x10 /* ro mirror of IRQ pin */
#define BASR_PHASE_MATCH 0x08 /* ro Set when MSG CD IO match TCR */
#define BASR_BUSY_ERROR 0x04 /* ro Unexpected change to inactive state */
#define BASR_ATN 0x02 /* ro BUS status */
#define BASR_ACK 0x01 /* ro BUS status */
/* Write any value to this register to start a DMA send */
#define START_DMA_SEND_REG 5 /* wo */
/*
* Used in DMA transfer mode, data is latched from the SCSI bus on
* the falling edge of REQ (ini) or ACK (tgt)
*/
#define INPUT_DATA_REG 6 /* ro */
/* Write any value to this register to start a DMA receive */
#define START_DMA_TARGET_RECEIVE_REG 6 /* wo */
/* Read this register to clear interrupt conditions */
#define RESET_PARITY_INTERRUPT_REG 7 /* ro */
/* Write any value to this register to start an ini mode DMA receive */
#define START_DMA_INITIATOR_RECEIVE_REG 7 /* wo */
/* NCR 53C400(A) Control Status Register bits: */
#define CSR_RESET 0x80 /* wo Resets 53c400 */
#define CSR_53C80_REG 0x80 /* ro 5380 registers busy */
#define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */
#define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */
#define CSR_53C80_INTR 0x10 /* rw Enable 53c80 interrupts */
#define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */
#define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Is Host buffer ready */
#define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer read */
#define CSR_GATED_53C80_IRQ 0x01 /* ro Last block xferred */
#if 0
#define CSR_BASE CSR_SCSI_BUFF_INTR | CSR_53C80_INTR
#else
#define CSR_BASE CSR_53C80_INTR
#endif
/* Note : PHASE_* macros are based on the values of the STATUS register */
#define PHASE_MASK (SR_MSG | SR_CD | SR_IO)
#define PHASE_DATAOUT 0
#define PHASE_DATAIN SR_IO
#define PHASE_CMDOUT SR_CD
#define PHASE_STATIN (SR_CD | SR_IO)
#define PHASE_MSGOUT (SR_MSG | SR_CD)
#define PHASE_MSGIN (SR_MSG | SR_CD | SR_IO)
#define PHASE_UNKNOWN 0xff
/*
* Convert status register phase to something we can use to set phase in
* the target register so we can get phase mismatch interrupts on DMA
* transfers.
*/
#define PHASE_SR_TO_TCR(phase) ((phase) >> 2)
#ifndef NO_IRQ
#define NO_IRQ 0
#endif
#define FLAG_DMA_FIXUP 1 /* Use DMA errata workarounds */
#define FLAG_NO_PSEUDO_DMA 8 /* Inhibit DMA */
#define FLAG_LATE_DMA_SETUP 32 /* Setup NCR before DMA H/W */
#define FLAG_TOSHIBA_DELAY 128 /* Allow for borken CD-ROMs */
struct NCR5380_hostdata {
NCR5380_implementation_fields; /* Board-specific data */
u8 __iomem *io; /* Remapped 5380 address */
u8 __iomem *pdma_io; /* Remapped PDMA address */
unsigned long poll_loops; /* Register polling limit */
spinlock_t lock; /* Protects this struct */
struct scsi_cmnd *connected; /* Currently connected cmnd */
struct list_head disconnected; /* Waiting for reconnect */
struct Scsi_Host *host; /* SCSI host backpointer */
struct workqueue_struct *work_q; /* SCSI host work queue */
struct work_struct main_task; /* Work item for main loop */
int flags; /* Board-specific quirks */
int dma_len; /* Requested length of DMA */
int read_overruns; /* Transfer size reduction for DMA erratum */
unsigned long io_port; /* Device IO port */
unsigned long base; /* Device base address */
struct list_head unissued; /* Waiting to be issued */
struct scsi_cmnd *selecting; /* Cmnd to be connected */
struct list_head autosense; /* Priority cmnd queue */
struct scsi_cmnd *sensing; /* Cmnd needing autosense */
struct scsi_eh_save ses; /* Cmnd state saved for EH */
unsigned char busy[8]; /* Index = target, bit = lun */
unsigned char id_mask; /* 1 << Host ID */
unsigned char id_higher_mask; /* All bits above id_mask */
unsigned char last_message; /* Last Message Out */
unsigned long region_size; /* Size of address/port range */
char info[256];
};
#ifdef __KERNEL__
struct NCR5380_cmd {
struct list_head list;
};
#define NCR5380_CMD_SIZE (sizeof(struct NCR5380_cmd))
#define NCR5380_PIO_CHUNK_SIZE 256
/* Time limit (ms) to poll registers when IRQs are disabled, e.g. during PDMA */
#define NCR5380_REG_POLL_TIME 15
static inline struct scsi_cmnd *NCR5380_to_scmd(struct NCR5380_cmd *ncmd_ptr)
{
return ((struct scsi_cmnd *)ncmd_ptr) - 1;
}
#ifndef NDEBUG
#define NDEBUG (0)
#endif
#define dprintk(flg, fmt, ...) \
do { if ((NDEBUG) & (flg)) \
printk(KERN_DEBUG fmt, ## __VA_ARGS__); } while (0)
#define dsprintk(flg, host, fmt, ...) \
do { if ((NDEBUG) & (flg)) \
shost_printk(KERN_DEBUG, host, fmt, ## __VA_ARGS__); \
} while (0)
#if NDEBUG
#define NCR5380_dprint(flg, arg) \
do { if ((NDEBUG) & (flg)) NCR5380_print(arg); } while (0)
#define NCR5380_dprint_phase(flg, arg) \
do { if ((NDEBUG) & (flg)) NCR5380_print_phase(arg); } while (0)
static void NCR5380_print_phase(struct Scsi_Host *instance);
static void NCR5380_print(struct Scsi_Host *instance);
#else
#define NCR5380_dprint(flg, arg) do {} while (0)
#define NCR5380_dprint_phase(flg, arg) do {} while (0)
#endif
static int NCR5380_init(struct Scsi_Host *instance, int flags);
static int NCR5380_maybe_reset_bus(struct Scsi_Host *);
static void NCR5380_exit(struct Scsi_Host *instance);
static void NCR5380_information_transfer(struct Scsi_Host *instance);
static irqreturn_t NCR5380_intr(int irq, void *dev_id);
static void NCR5380_main(struct work_struct *work);
static const char *NCR5380_info(struct Scsi_Host *instance);
static void NCR5380_reselect(struct Scsi_Host *instance);
static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *, struct scsi_cmnd *);
static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data);
static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data);
static int NCR5380_poll_politely2(struct NCR5380_hostdata *,
unsigned int, u8, u8,
unsigned int, u8, u8, unsigned long);
static inline int NCR5380_poll_politely(struct NCR5380_hostdata *hostdata,
unsigned int reg, u8 bit, u8 val,
unsigned long wait)
{
if ((NCR5380_read(reg) & bit) == val)
return 0;
return NCR5380_poll_politely2(hostdata, reg, bit, val,
reg, bit, val, wait);
}
static int NCR5380_dma_xfer_len(struct NCR5380_hostdata *,
struct scsi_cmnd *);
static int NCR5380_dma_send_setup(struct NCR5380_hostdata *,
unsigned char *, int);
static int NCR5380_dma_recv_setup(struct NCR5380_hostdata *,
unsigned char *, int);
static int NCR5380_dma_residual(struct NCR5380_hostdata *);
static inline int NCR5380_dma_xfer_none(struct NCR5380_hostdata *hostdata,
struct scsi_cmnd *cmd)
{
return 0;
}
static inline int NCR5380_dma_setup_none(struct NCR5380_hostdata *hostdata,
unsigned char *data, int count)
{
return 0;
}
static inline int NCR5380_dma_residual_none(struct NCR5380_hostdata *hostdata)
{
return 0;
}
#endif /* __KERNEL__ */
#endif /* NCR5380_H */