| /* $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)) |
| |
| #endif /* !(_SPARC_ESP_H) */ |