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Diffstat (limited to 'drivers/scsi/esp.h')
| -rw-r--r-- | drivers/scsi/esp.h | 410 |
1 files changed, 410 insertions, 0 deletions
diff --git a/drivers/scsi/esp.h b/drivers/scsi/esp.h new file mode 100644 index 00000000000..73f7d6968ab --- /dev/null +++ b/drivers/scsi/esp.h @@ -0,0 +1,410 @@ +/* $Id: esp.h,v 1.29 2001/12/11 04:55:47 davem Exp $ + * esp.h: Defines and structures for the Sparc ESP (Enhanced SCSI + * Processor) driver under Linux. + * + * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) + */ + +#ifndef _SPARC_ESP_H +#define _SPARC_ESP_H + +/* For dvma controller register definitions. */ +#include <asm/dma.h> + +/* The ESP SCSI controllers have their register sets in three + * "classes": + * + * 1) Registers which are both read and write. + * 2) Registers which are read only. + * 3) Registers which are write only. + * + * Yet, they all live within the same IO space. + */ + +/* All the ESP registers are one byte each and are accessed longwords + * apart with a big-endian ordering to the bytes. + */ + /* Access Description Offset */ +#define ESP_TCLOW 0x00UL /* rw Low bits of the transfer count 0x00 */ +#define ESP_TCMED 0x04UL /* rw Mid bits of the transfer count 0x04 */ +#define ESP_FDATA 0x08UL /* rw FIFO data bits 0x08 */ +#define ESP_CMD 0x0cUL /* rw SCSI command bits 0x0c */ +#define ESP_STATUS 0x10UL /* ro ESP status register 0x10 */ +#define ESP_BUSID ESP_STATUS /* wo Bus ID for select/reselect 0x10 */ +#define ESP_INTRPT 0x14UL /* ro Kind of interrupt 0x14 */ +#define ESP_TIMEO ESP_INTRPT /* wo Timeout value for select/resel 0x14 */ +#define ESP_SSTEP 0x18UL /* ro Sequence step register 0x18 */ +#define ESP_STP ESP_SSTEP /* wo Transfer period per sync 0x18 */ +#define ESP_FFLAGS 0x1cUL /* ro Bits of current FIFO info 0x1c */ +#define ESP_SOFF ESP_FFLAGS /* wo Sync offset 0x1c */ +#define ESP_CFG1 0x20UL /* rw First configuration register 0x20 */ +#define ESP_CFACT 0x24UL /* wo Clock conversion factor 0x24 */ +#define ESP_STATUS2 ESP_CFACT /* ro HME status2 register 0x24 */ +#define ESP_CTEST 0x28UL /* wo Chip test register 0x28 */ +#define ESP_CFG2 0x2cUL /* rw Second configuration register 0x2c */ +#define ESP_CFG3 0x30UL /* rw Third configuration register 0x30 */ +#define ESP_TCHI 0x38UL /* rw High bits of transfer count 0x38 */ +#define ESP_UID ESP_TCHI /* ro Unique ID code 0x38 */ +#define FAS_RLO ESP_TCHI /* rw HME extended counter 0x38 */ +#define ESP_FGRND 0x3cUL /* rw Data base for fifo 0x3c */ +#define FAS_RHI ESP_FGRND /* rw HME extended counter 0x3c */ +#define ESP_REG_SIZE 0x40UL + +/* Various revisions of the ESP board. */ +enum esp_rev { + esp100 = 0x00, /* NCR53C90 - very broken */ + esp100a = 0x01, /* NCR53C90A */ + esp236 = 0x02, + fas236 = 0x03, + fas100a = 0x04, + fast = 0x05, + fashme = 0x06, + espunknown = 0x07 +}; + +/* We allocate one of these for each scsi device and attach it to + * SDptr->hostdata for use in the driver + */ +struct esp_device { + unsigned char sync_min_period; + unsigned char sync_max_offset; + unsigned sync:1; + unsigned wide:1; + unsigned disconnect:1; +}; + +struct scsi_cmnd; + +/* We get one of these for each ESP probed. */ +struct esp { + void __iomem *eregs; /* ESP controller registers */ + void __iomem *dregs; /* DMA controller registers */ + struct sbus_dma *dma; /* DMA controller sw state */ + struct Scsi_Host *ehost; /* Backpointer to SCSI Host */ + struct sbus_dev *sdev; /* Pointer to SBus entry */ + + /* ESP Configuration Registers */ + u8 config1; /* Copy of the 1st config register */ + u8 config2; /* Copy of the 2nd config register */ + u8 config3[16]; /* Copy of the 3rd config register */ + + /* The current command we are sending to the ESP chip. This esp_command + * ptr needs to be mapped in DVMA area so we can send commands and read + * from the ESP fifo without burning precious CPU cycles. Programmed I/O + * sucks when we have the DVMA to do it for us. The ESP is stupid and will + * only send out 6, 10, and 12 byte SCSI commands, others we need to send + * one byte at a time. esp_slowcmd being set says that we are doing one + * of the command types ESP doesn't understand, esp_scmdp keeps track of + * which byte we are sending, esp_scmdleft says how many bytes to go. + */ + volatile u8 *esp_command; /* Location of command (CPU view) */ + __u32 esp_command_dvma;/* Location of command (DVMA view) */ + unsigned char esp_clen; /* Length of this command */ + unsigned char esp_slowcmd; + unsigned char *esp_scmdp; + unsigned char esp_scmdleft; + + /* The following are used to determine the cause of an IRQ. Upon every + * IRQ entry we synchronize these with the hardware registers. + */ + u8 ireg; /* Copy of ESP interrupt register */ + u8 sreg; /* Copy of ESP status register */ + u8 seqreg; /* Copy of ESP sequence step register */ + u8 sreg2; /* Copy of HME status2 register */ + + /* To save register writes to the ESP, which can be expensive, we + * keep track of the previous value that various registers had for + * the last target we connected to. If they are the same for the + * current target, we skip the register writes as they are not needed. + */ + u8 prev_soff, prev_stp; + u8 prev_cfg3, __cache_pad; + + /* We also keep a cache of the previous FAS/HME DMA CSR register value. */ + u32 prev_hme_dmacsr; + + /* The HME is the biggest piece of shit I have ever seen. */ + u8 hme_fifo_workaround_buffer[16 * 2]; + u8 hme_fifo_workaround_count; + + /* For each target we keep track of save/restore data + * pointer information. This needs to be updated majorly + * when we add support for tagged queueing. -DaveM + */ + struct esp_pointers { + char *saved_ptr; + struct scatterlist *saved_buffer; + int saved_this_residual; + int saved_buffers_residual; + } data_pointers[16] /*XXX [MAX_TAGS_PER_TARGET]*/; + + /* Clock periods, frequencies, synchronization, etc. */ + unsigned int cfreq; /* Clock frequency in HZ */ + unsigned int cfact; /* Clock conversion factor */ + unsigned int raw_cfact; /* Raw copy from probing */ + unsigned int ccycle; /* One ESP clock cycle */ + unsigned int ctick; /* One ESP clock time */ + unsigned int radelay; /* FAST chip req/ack delay */ + unsigned int neg_defp; /* Default negotiation period */ + unsigned int sync_defp; /* Default sync transfer period */ + unsigned int max_period; /* longest our period can be */ + unsigned int min_period; /* shortest period we can withstand */ + + struct esp *next; /* Next ESP we probed or NULL */ + char prom_name[64]; /* Name of ESP device from prom */ + int prom_node; /* Prom node where ESP found */ + int esp_id; /* Unique per-ESP ID number */ + + /* For slow to medium speed input clock rates we shoot for 5mb/s, + * but for high input clock rates we try to do 10mb/s although I + * don't think a transfer can even run that fast with an ESP even + * with DMA2 scatter gather pipelining. + */ +#define SYNC_DEFP_SLOW 0x32 /* 5mb/s */ +#define SYNC_DEFP_FAST 0x19 /* 10mb/s */ + + unsigned int snip; /* Sync. negotiation in progress */ + unsigned int wnip; /* WIDE negotiation in progress */ + unsigned int targets_present;/* targets spoken to before */ + + int current_transfer_size; /* Set at beginning of data dma */ + + u8 espcmdlog[32]; /* Log of current esp cmds sent. */ + u8 espcmdent; /* Current entry in esp cmd log. */ + + /* Misc. info about this ESP */ + enum esp_rev erev; /* ESP revision */ + int irq; /* SBus IRQ for this ESP */ + int scsi_id; /* Who am I as initiator? */ + int scsi_id_mask; /* Bitmask of 'me'. */ + int diff; /* Differential SCSI bus? */ + int bursts; /* Burst sizes our DVMA supports */ + + /* Our command queues, only one cmd lives in the current_SC queue. */ + struct scsi_cmnd *issue_SC; /* Commands to be issued */ + struct scsi_cmnd *current_SC; /* Who is currently working the bus */ + struct scsi_cmnd *disconnected_SC;/* Commands disconnected from the bus */ + + /* Message goo */ + u8 cur_msgout[16]; + u8 cur_msgin[16]; + u8 prevmsgout, prevmsgin; + u8 msgout_len, msgin_len; + u8 msgout_ctr, msgin_ctr; + + /* States that we cannot keep in the per cmd structure because they + * cannot be assosciated with any specific command. + */ + u8 resetting_bus; + wait_queue_head_t reset_queue; +}; + +/* Bitfield meanings for the above registers. */ + +/* ESP config reg 1, read-write, found on all ESP chips */ +#define ESP_CONFIG1_ID 0x07 /* My BUS ID bits */ +#define ESP_CONFIG1_CHTEST 0x08 /* Enable ESP chip tests */ +#define ESP_CONFIG1_PENABLE 0x10 /* Enable parity checks */ +#define ESP_CONFIG1_PARTEST 0x20 /* Parity test mode enabled? */ +#define ESP_CONFIG1_SRRDISAB 0x40 /* Disable SCSI reset reports */ +#define ESP_CONFIG1_SLCABLE 0x80 /* Enable slow cable mode */ + +/* ESP config reg 2, read-write, found only on esp100a+esp200+esp236 chips */ +#define ESP_CONFIG2_DMAPARITY 0x01 /* enable DMA Parity (200,236) */ +#define ESP_CONFIG2_REGPARITY 0x02 /* enable reg Parity (200,236) */ +#define ESP_CONFIG2_BADPARITY 0x04 /* Bad parity target abort */ +#define ESP_CONFIG2_SCSI2ENAB 0x08 /* Enable SCSI-2 features (tmode only) */ +#define ESP_CONFIG2_HI 0x10 /* High Impedance DREQ ??? */ +#define ESP_CONFIG2_HMEFENAB 0x10 /* HME features enable */ +#define ESP_CONFIG2_BCM 0x20 /* Enable byte-ctrl (236) */ +#define ESP_CONFIG2_DISPINT 0x20 /* Disable pause irq (hme) */ +#define ESP_CONFIG2_FENAB 0x40 /* Enable features (fas100,esp216) */ +#define ESP_CONFIG2_SPL 0x40 /* Enable status-phase latch (esp236) */ +#define ESP_CONFIG2_MKDONE 0x40 /* HME magic feature */ +#define ESP_CONFIG2_HME32 0x80 /* HME 32 extended */ +#define ESP_CONFIG2_MAGIC 0xe0 /* Invalid bits... */ + +/* ESP config register 3 read-write, found only esp236+fas236+fas100a+hme chips */ +#define ESP_CONFIG3_FCLOCK 0x01 /* FAST SCSI clock rate (esp100a/hme) */ +#define ESP_CONFIG3_TEM 0x01 /* Enable thresh-8 mode (esp/fas236) */ +#define ESP_CONFIG3_FAST 0x02 /* Enable FAST SCSI (esp100a/hme) */ +#define ESP_CONFIG3_ADMA 0x02 /* Enable alternate-dma (esp/fas236) */ +#define ESP_CONFIG3_TENB 0x04 /* group2 SCSI2 support (esp100a/hme) */ +#define ESP_CONFIG3_SRB 0x04 /* Save residual byte (esp/fas236) */ +#define ESP_CONFIG3_TMS 0x08 /* Three-byte msg's ok (esp100a/hme) */ +#define ESP_CONFIG3_FCLK 0x08 /* Fast SCSI clock rate (esp/fas236) */ +#define ESP_CONFIG3_IDMSG 0x10 /* ID message checking (esp100a/hme) */ +#define ESP_CONFIG3_FSCSI 0x10 /* Enable FAST SCSI (esp/fas236) */ +#define ESP_CONFIG3_GTM 0x20 /* group2 SCSI2 support (esp/fas236) */ +#define ESP_CONFIG3_IDBIT3 0x20 /* Bit 3 of HME SCSI-ID (hme) */ +#define ESP_CONFIG3_TBMS 0x40 /* Three-byte msg's ok (esp/fas236) */ +#define ESP_CONFIG3_EWIDE 0x40 /* Enable Wide-SCSI (hme) */ +#define ESP_CONFIG3_IMS 0x80 /* ID msg chk'ng (esp/fas236) */ +#define ESP_CONFIG3_OBPUSH 0x80 /* Push odd-byte to dma (hme) */ + +/* ESP command register read-write */ +/* Group 1 commands: These may be sent at any point in time to the ESP + * chip. None of them can generate interrupts 'cept + * the "SCSI bus reset" command if you have not disabled + * SCSI reset interrupts in the config1 ESP register. + */ +#define ESP_CMD_NULL 0x00 /* Null command, ie. a nop */ +#define ESP_CMD_FLUSH 0x01 /* FIFO Flush */ +#define ESP_CMD_RC 0x02 /* Chip reset */ +#define ESP_CMD_RS 0x03 /* SCSI bus reset */ + +/* Group 2 commands: ESP must be an initiator and connected to a target + * for these commands to work. + */ +#define ESP_CMD_TI 0x10 /* Transfer Information */ +#define ESP_CMD_ICCSEQ 0x11 /* Initiator cmd complete sequence */ +#define ESP_CMD_MOK 0x12 /* Message okie-dokie */ +#define ESP_CMD_TPAD 0x18 /* Transfer Pad */ +#define ESP_CMD_SATN 0x1a /* Set ATN */ +#define ESP_CMD_RATN 0x1b /* De-assert ATN */ + +/* Group 3 commands: ESP must be in the MSGOUT or MSGIN state and be connected + * to a target as the initiator for these commands to work. + */ +#define ESP_CMD_SMSG 0x20 /* Send message */ +#define ESP_CMD_SSTAT 0x21 /* Send status */ +#define ESP_CMD_SDATA 0x22 /* Send data */ +#define ESP_CMD_DSEQ 0x23 /* Discontinue Sequence */ +#define ESP_CMD_TSEQ 0x24 /* Terminate Sequence */ +#define ESP_CMD_TCCSEQ 0x25 /* Target cmd cmplt sequence */ +#define ESP_CMD_DCNCT 0x27 /* Disconnect */ +#define ESP_CMD_RMSG 0x28 /* Receive Message */ +#define ESP_CMD_RCMD 0x29 /* Receive Command */ +#define ESP_CMD_RDATA 0x2a /* Receive Data */ +#define ESP_CMD_RCSEQ 0x2b /* Receive cmd sequence */ + +/* Group 4 commands: The ESP must be in the disconnected state and must + * not be connected to any targets as initiator for + * these commands to work. + */ +#define ESP_CMD_RSEL 0x40 /* Reselect */ +#define ESP_CMD_SEL 0x41 /* Select w/o ATN */ +#define ESP_CMD_SELA 0x42 /* Select w/ATN */ +#define ESP_CMD_SELAS 0x43 /* Select w/ATN & STOP */ +#define ESP_CMD_ESEL 0x44 /* Enable selection */ +#define ESP_CMD_DSEL 0x45 /* Disable selections */ +#define ESP_CMD_SA3 0x46 /* Select w/ATN3 */ +#define ESP_CMD_RSEL3 0x47 /* Reselect3 */ + +/* This bit enables the ESP's DMA on the SBus */ +#define ESP_CMD_DMA 0x80 /* Do DMA? */ + + +/* ESP status register read-only */ +#define ESP_STAT_PIO 0x01 /* IO phase bit */ +#define ESP_STAT_PCD 0x02 /* CD phase bit */ +#define ESP_STAT_PMSG 0x04 /* MSG phase bit */ +#define ESP_STAT_PMASK 0x07 /* Mask of phase bits */ +#define ESP_STAT_TDONE 0x08 /* Transfer Completed */ +#define ESP_STAT_TCNT 0x10 /* Transfer Counter Is Zero */ +#define ESP_STAT_PERR 0x20 /* Parity error */ +#define ESP_STAT_SPAM 0x40 /* Real bad error */ +/* This indicates the 'interrupt pending' condition on esp236, it is a reserved + * bit on other revs of the ESP. + */ +#define ESP_STAT_INTR 0x80 /* Interrupt */ + +/* HME only: status 2 register */ +#define ESP_STAT2_SCHBIT 0x01 /* Upper bits 3-7 of sstep enabled */ +#define ESP_STAT2_FFLAGS 0x02 /* The fifo flags are now latched */ +#define ESP_STAT2_XCNT 0x04 /* The transfer counter is latched */ +#define ESP_STAT2_CREGA 0x08 /* The command reg is active now */ +#define ESP_STAT2_WIDE 0x10 /* Interface on this adapter is wide */ +#define ESP_STAT2_F1BYTE 0x20 /* There is one byte at top of fifo */ +#define ESP_STAT2_FMSB 0x40 /* Next byte in fifo is most significant */ +#define ESP_STAT2_FEMPTY 0x80 /* FIFO is empty */ + +/* The status register can be masked with ESP_STAT_PMASK and compared + * with the following values to determine the current phase the ESP + * (at least thinks it) is in. For our purposes we also add our own + * software 'done' bit for our phase management engine. + */ +#define ESP_DOP (0) /* Data Out */ +#define ESP_DIP (ESP_STAT_PIO) /* Data In */ +#define ESP_CMDP (ESP_STAT_PCD) /* Command */ +#define ESP_STATP (ESP_STAT_PCD|ESP_STAT_PIO) /* Status */ +#define ESP_MOP (ESP_STAT_PMSG|ESP_STAT_PCD) /* Message Out */ +#define ESP_MIP (ESP_STAT_PMSG|ESP_STAT_PCD|ESP_STAT_PIO) /* Message In */ + +/* ESP interrupt register read-only */ +#define ESP_INTR_S 0x01 /* Select w/o ATN */ +#define ESP_INTR_SATN 0x02 /* Select w/ATN */ +#define ESP_INTR_RSEL 0x04 /* Reselected */ +#define ESP_INTR_FDONE 0x08 /* Function done */ +#define ESP_INTR_BSERV 0x10 /* Bus service */ +#define ESP_INTR_DC 0x20 /* Disconnect */ +#define ESP_INTR_IC 0x40 /* Illegal command given */ +#define ESP_INTR_SR 0x80 /* SCSI bus reset detected */ + +/* Interrupt status macros */ +#define ESP_SRESET_IRQ(esp) ((esp)->intreg & (ESP_INTR_SR)) +#define ESP_ILLCMD_IRQ(esp) ((esp)->intreg & (ESP_INTR_IC)) +#define ESP_SELECT_WITH_ATN_IRQ(esp) ((esp)->intreg & (ESP_INTR_SATN)) +#define ESP_SELECT_WITHOUT_ATN_IRQ(esp) ((esp)->intreg & (ESP_INTR_S)) +#define ESP_SELECTION_IRQ(esp) ((ESP_SELECT_WITH_ATN_IRQ(esp)) || \ + (ESP_SELECT_WITHOUT_ATN_IRQ(esp))) +#define ESP_RESELECTION_IRQ(esp) ((esp)->intreg & (ESP_INTR_RSEL)) + +/* ESP sequence step register read-only */ +#define ESP_STEP_VBITS 0x07 /* Valid bits */ +#define ESP_STEP_ASEL 0x00 /* Selection&Arbitrate cmplt */ +#define ESP_STEP_SID 0x01 /* One msg byte sent */ +#define ESP_STEP_NCMD 0x02 /* Was not in command phase */ +#define ESP_STEP_PPC 0x03 /* Early phase chg caused cmnd + * bytes to be lost + */ +#define ESP_STEP_FINI4 0x04 /* Command was sent ok */ + +/* Ho hum, some ESP's set the step register to this as well... */ +#define ESP_STEP_FINI5 0x05 +#define ESP_STEP_FINI6 0x06 +#define ESP_STEP_FINI7 0x07 + +/* ESP chip-test register read-write */ +#define ESP_TEST_TARG 0x01 /* Target test mode */ +#define ESP_TEST_INI 0x02 /* Initiator test mode */ +#define ESP_TEST_TS 0x04 /* Tristate test mode */ + +/* ESP unique ID register read-only, found on fas236+fas100a only */ +#define ESP_UID_F100A 0x00 /* ESP FAS100A */ +#define ESP_UID_F236 0x02 /* ESP FAS236 */ +#define ESP_UID_REV 0x07 /* ESP revision */ +#define ESP_UID_FAM 0xf8 /* ESP family */ + +/* ESP fifo flags register read-only */ +/* Note that the following implies a 16 byte FIFO on the ESP. */ +#define ESP_FF_FBYTES 0x1f /* Num bytes in FIFO */ +#define ESP_FF_ONOTZERO 0x20 /* offset ctr not zero (esp100) */ +#define ESP_FF_SSTEP 0xe0 /* Sequence step */ + +/* ESP clock conversion factor register write-only */ +#define ESP_CCF_F0 0x00 /* 35.01MHz - 40MHz */ +#define ESP_CCF_NEVER 0x01 /* Set it to this and die */ +#define ESP_CCF_F2 0x02 /* 10MHz */ +#define ESP_CCF_F3 0x03 /* 10.01MHz - 15MHz */ +#define ESP_CCF_F4 0x04 /* 15.01MHz - 20MHz */ +#define ESP_CCF_F5 0x05 /* 20.01MHz - 25MHz */ +#define ESP_CCF_F6 0x06 /* 25.01MHz - 30MHz */ +#define ESP_CCF_F7 0x07 /* 30.01MHz - 35MHz */ + +/* HME only... */ +#define ESP_BUSID_RESELID 0x10 +#define ESP_BUSID_CTR32BIT 0x40 + +#define ESP_BUS_TIMEOUT 275 /* In milli-seconds */ +#define ESP_TIMEO_CONST 8192 +#define ESP_NEG_DEFP(mhz, cfact) \ + ((ESP_BUS_TIMEOUT * ((mhz) / 1000)) / (8192 * (cfact))) +#define ESP_MHZ_TO_CYCLE(mhertz) ((1000000000) / ((mhertz) / 1000)) +#define ESP_TICK(ccf, cycle) ((7682 * (ccf) * (cycle) / 1000)) + +/* For our interrupt engine. */ +#define for_each_esp(esp) \ + for((esp) = espchain; (esp); (esp) = (esp)->next) + +#endif /* !(_SPARC_ESP_H) */ |