NCR5380.h
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上传日期:2013-02-24
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- /*
- * NCR 5380 defines
- *
- * Copyright 1993, Drew Eckhardt
- * Visionary Computing
- * (Unix consulting and custom programming)
- * drew@colorado.edu
- * +1 (303) 666-5836
- *
- * DISTRIBUTION RELEASE 7
- *
- * 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
- */
- /*
- * $Log: NCR5380.h,v $
- */
- #ifndef NCR5380_H
- #define NCR5380_H
- #define NCR5380_PUBLIC_RELEASE 7
- #define NCR53C400_PUBLIC_RELEASE 2
- #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_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 */
- #define C400_CONTROL_STATUS_REG NCR53C400_register_offset-8 /* rw */
- #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
- /* Number of 128-byte blocks to be transferred */
- #define C400_BLOCK_COUNTER_REG NCR53C400_register_offset-7 /* rw */
- /* Resume transfer after disconnect */
- #define C400_RESUME_TRANSFER_REG NCR53C400_register_offset-6 /* wo */
- /* Access to host buffer stack */
- #define C400_HOST_BUFFER NCR53C400_register_offset-4 /* rw */
- /* 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)
- /*
- * The internal should_disconnect() function returns these based on the
- * expected length of a disconnect if a device supports disconnect/
- * reconnect.
- */
- #define DISCONNECT_NONE 0
- #define DISCONNECT_TIME_TO_DATA 1
- #define DISCONNECT_LONG 2
- /*
- * These are "special" values for the tag parameter passed to NCR5380_select.
- */
- #define TAG_NEXT -1 /* Use next free tag */
- #define TAG_NONE -2 /*
- * Establish I_T_L nexus instead of I_T_L_Q
- * even on SCSI-II devices.
- */
- /*
- * These are "special" values for the irq and dma_channel fields of the
- * Scsi_Host structure
- */
- #define IRQ_NONE 255
- #define DMA_NONE 255
- #define IRQ_AUTO 254
- #define DMA_AUTO 254
- #define PORT_AUTO 0xffff /* autoprobe io port for 53c400a */
- #define FLAG_HAS_LAST_BYTE_SENT 1 /* NCR53c81 or better */
- #define FLAG_CHECK_LAST_BYTE_SENT 2 /* Only test once */
- #define FLAG_NCR53C400 4 /* NCR53c400 */
- #define FLAG_NO_PSEUDO_DMA 8 /* Inhibit DMA */
- #define FLAG_DTC3181E 16 /* DTC3181E */
- #ifndef ASM
- struct NCR5380_hostdata {
- NCR5380_implementation_fields; /* implementation specific */
- unsigned char id_mask, id_higher_mask; /* 1 << id, all bits greater */
- unsigned char targets_present; /* targets we have connected
- to, so we can call a select
- failure a retryable condition */
- volatile unsigned char busy[8]; /* index = target, bit = lun */
- #if defined(REAL_DMA) || defined(REAL_DMA_POLL)
- volatile int dma_len; /* requested length of DMA */
- #endif
- volatile unsigned char last_message; /* last message OUT */
- volatile Scsi_Cmnd *connected; /* currently connected command */
- volatile Scsi_Cmnd *issue_queue; /* waiting to be issued */
- volatile Scsi_Cmnd *disconnected_queue; /* waiting for reconnect */
- volatile int restart_select; /* we have disconnected,
- used to restart
- NCR5380_select() */
- volatile unsigned aborted:1; /* flag, says aborted */
- int flags;
- unsigned long time_expires; /* in jiffies, set prior to sleeping */
- struct Scsi_Host *next_timer;
- int select_time; /* timer in select for target response */
- volatile Scsi_Cmnd *selecting;
- #ifdef NCR5380_STATS
- unsigned timebase; /* Base for time calcs */
- long time_read[8]; /* time to do reads */
- long time_write[8]; /* time to do writes */
- unsigned long bytes_read[8]; /* bytes read */
- unsigned long bytes_write[8]; /* bytes written */
- unsigned pendingr;
- unsigned pendingw;
- #endif
- };
- #ifdef __KERNEL__
- static struct Scsi_Host *first_instance; /* linked list of 5380's */
- #define dprintk(a,b) do {} while(0)
- #define NCR5380_dprint(a,b) do {} while(0)
- #define NCR5380_dprint_phase(a,b) do {} while(0)
- #if defined(AUTOPROBE_IRQ)
- static int NCR5380_probe_irq(struct Scsi_Host *instance, int possible);
- #endif
- static void NCR5380_init(struct Scsi_Host *instance, int flags);
- static void NCR5380_information_transfer(struct Scsi_Host *instance);
- #ifndef DONT_USE_INTR
- static void NCR5380_intr(int irq, void *dev_id, struct pt_regs *regs);
- static void do_NCR5380_intr(int irq, void *dev_id, struct pt_regs *regs);
- #endif
- static void NCR5380_main(void);
- static void NCR5380_print_options(struct Scsi_Host *instance);
- static void NCR5380_print_phase(struct Scsi_Host *instance);
- static void NCR5380_print(struct Scsi_Host *instance);
- #ifndef NCR5380_abort
- static
- #endif
- int NCR5380_abort(Scsi_Cmnd * cmd);
- #ifndef NCR5380_reset
- static
- #endif
- int NCR5380_reset(Scsi_Cmnd * cmd, unsigned int reset_flags);
- #ifndef NCR5380_queue_command
- static
- #endif
- int NCR5380_queue_command(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *));
- static void NCR5380_reselect(struct Scsi_Host *instance);
- static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag);
- #if defined(PSEUDO_DMA) || defined(REAL_DMA) || defined(REAL_DMA_POLL)
- static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data);
- #endif
- static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data);
- #if (defined(REAL_DMA) || defined(REAL_DMA_POLL))
- #if defined(i386) || defined(__alpha__)
- /**
- * NCR5380_pc_dma_setup - setup ISA DMA
- * @instance: adapter to set up
- * @ptr: block to transfer (virtual address)
- * @count: number of bytes to transfer
- * @mode: DMA controller mode to use
- *
- * Program the DMA controller ready to perform an ISA DMA transfer
- * on this chip.
- *
- * Locks: takes and releases the ISA DMA lock.
- */
-
- static __inline__ int NCR5380_pc_dma_setup(struct Scsi_Host *instance, unsigned char *ptr, unsigned int count, unsigned char mode)
- {
- unsigned limit;
- unsigned long bus_addr = virt_to_bus(ptr);
- unsigned long flags;
- if (instance->dma_channel <= 3) {
- if (count > 65536)
- count = 65536;
- limit = 65536 - (bus_addr & 0xFFFF);
- } else {
- if (count > 65536 * 2)
- count = 65536 * 2;
- limit = 65536 * 2 - (bus_addr & 0x1FFFF);
- }
- if (count > limit)
- count = limit;
- if ((count & 1) || (bus_addr & 1))
- panic("scsi%d : attempted unaligned DMA transfern", instance->host_no);
-
- flags=claim_dma_lock();
- disable_dma(instance->dma_channel);
- clear_dma_ff(instance->dma_channel);
- set_dma_addr(instance->dma_channel, bus_addr);
- set_dma_count(instance->dma_channel, count);
- set_dma_mode(instance->dma_channel, mode);
- enable_dma(instance->dma_channel);
- release_dma_lock(flags);
-
- return count;
- }
- /**
- * NCR5380_pc_dma_write_setup - setup ISA DMA write
- * @instance: adapter to set up
- * @ptr: block to transfer (virtual address)
- * @count: number of bytes to transfer
- *
- * Program the DMA controller ready to perform an ISA DMA write to the
- * SCSI controller.
- *
- * Locks: called routines take and release the ISA DMA lock.
- */
- static __inline__ int NCR5380_pc_dma_write_setup(struct Scsi_Host *instance, unsigned char *src, unsigned int count)
- {
- return NCR5380_pc_dma_setup(instance, src, count, DMA_MODE_WRITE);
- }
- /**
- * NCR5380_pc_dma_read_setup - setup ISA DMA read
- * @instance: adapter to set up
- * @ptr: block to transfer (virtual address)
- * @count: number of bytes to transfer
- *
- * Program the DMA controller ready to perform an ISA DMA read from the
- * SCSI controller.
- *
- * Locks: called routines take and release the ISA DMA lock.
- */
- static __inline__ int NCR5380_pc_dma_read_setup(struct Scsi_Host *instance, unsigned char *src, unsigned int count)
- {
- return NCR5380_pc_dma_setup(instance, src, count, DMA_MODE_READ);
- }
- /**
- * NCR5380_pc_dma_residual - return bytes left
- * @instance: adapter
- *
- * Reports the number of bytes left over after the DMA was terminated.
- *
- * Locks: takes and releases the ISA DMA lock.
- */
- static __inline__ int NCR5380_pc_dma_residual(struct Scsi_Host *instance)
- {
- unsigned long flags;
- int tmp;
- flags = claim_dma_lock();
- clear_dma_ff(instance->dma_channel);
- tmp = get_dma_residue(instance->dma_channel);
- release_dma_lock(flags);
-
- return tmp;
- }
- #endif /* defined(i386) || defined(__alpha__) */
- #endif /* defined(REAL_DMA) */
- #endif /* __KERNEL__ */
- #endif /* ndef ASM */
- #endif /* NCR5380_H */