diff options
Diffstat (limited to 'drivers/scsi/esp_scsi.h')
| -rw-r--r-- | drivers/scsi/esp_scsi.h | 560 |
1 files changed, 560 insertions, 0 deletions
diff --git a/drivers/scsi/esp_scsi.h b/drivers/scsi/esp_scsi.h new file mode 100644 index 00000000000..8d4a6690401 --- /dev/null +++ b/drivers/scsi/esp_scsi.h @@ -0,0 +1,560 @@ +/* esp_scsi.h: Defines and structures for the ESP drier. + * + * Copyright (C) 2007 David S. Miller (davem@davemloft.net) + */ + +#ifndef _ESP_SCSI_H +#define _ESP_SCSI_H + + /* Access Description Offset */ +#define ESP_TCLOW 0x00UL /* rw Low bits transfer count 0x00 */ +#define ESP_TCMED 0x01UL /* rw Mid bits transfer count 0x04 */ +#define ESP_FDATA 0x02UL /* rw FIFO data bits 0x08 */ +#define ESP_CMD 0x03UL /* rw SCSI command bits 0x0c */ +#define ESP_STATUS 0x04UL /* ro ESP status register 0x10 */ +#define ESP_BUSID ESP_STATUS /* wo BusID for sel/resel 0x10 */ +#define ESP_INTRPT 0x05UL /* ro Kind of interrupt 0x14 */ +#define ESP_TIMEO ESP_INTRPT /* wo Timeout for sel/resel 0x14 */ +#define ESP_SSTEP 0x06UL /* ro Sequence step register 0x18 */ +#define ESP_STP ESP_SSTEP /* wo Transfer period/sync 0x18 */ +#define ESP_FFLAGS 0x07UL /* ro Bits current FIFO info 0x1c */ +#define ESP_SOFF ESP_FFLAGS /* wo Sync offset 0x1c */ +#define ESP_CFG1 0x08UL /* rw First cfg register 0x20 */ +#define ESP_CFACT 0x09UL /* wo Clock conv factor 0x24 */ +#define ESP_STATUS2 ESP_CFACT /* ro HME status2 register 0x24 */ +#define ESP_CTEST 0x0aUL /* wo Chip test register 0x28 */ +#define ESP_CFG2 0x0bUL /* rw Second cfg register 0x2c */ +#define ESP_CFG3 0x0cUL /* rw Third cfg register 0x30 */ +#define ESP_TCHI 0x0eUL /* rw High bits transf 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 0x0fUL /* rw Data base for fifo 0x3c */ +#define FAS_RHI ESP_FGRND /* rw HME extended counter 0x3c */ + +#define SBUS_ESP_REG_SIZE 0x40UL + +/* 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 (tgtmode) */ +#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 (fas100,216) */ +#define ESP_CONFIG2_SPL 0x40 /* Enable status-phase latch (236) */ +#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 */ + +/* 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 */ + +/* 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 */ + +/* 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 */ + +/* 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 250 /* 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 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 */ + +struct esp_cmd_priv { + union { + dma_addr_t dma_addr; + int num_sg; + } u; + + unsigned int cur_residue; + struct scatterlist *cur_sg; + unsigned int tot_residue; +}; +#define ESP_CMD_PRIV(CMD) ((struct esp_cmd_priv *)(&(CMD)->SCp)) + +enum esp_rev { + ESP100 = 0x00, /* NCR53C90 - very broken */ + ESP100A = 0x01, /* NCR53C90A */ + ESP236 = 0x02, + FAS236 = 0x03, + FAS100A = 0x04, + FAST = 0x05, + FASHME = 0x06, +}; + +struct esp_cmd_entry { + struct list_head list; + + struct scsi_cmnd *cmd; + + unsigned int saved_cur_residue; + struct scatterlist *saved_cur_sg; + unsigned int saved_tot_residue; + + u8 flags; +#define ESP_CMD_FLAG_WRITE 0x01 /* DMA is a write */ +#define ESP_CMD_FLAG_ABORT 0x02 /* being aborted */ +#define ESP_CMD_FLAG_AUTOSENSE 0x04 /* Doing automatic REQUEST_SENSE */ + + u8 tag[2]; + + u8 status; + u8 message; + + unsigned char *sense_ptr; + unsigned char *saved_sense_ptr; + dma_addr_t sense_dma; + + struct completion *eh_done; +}; + +/* XXX make this configurable somehow XXX */ +#define ESP_DEFAULT_TAGS 16 + +#define ESP_MAX_TARGET 16 +#define ESP_MAX_LUN 8 +#define ESP_MAX_TAG 256 + +struct esp_lun_data { + struct esp_cmd_entry *non_tagged_cmd; + int num_tagged; + int hold; + struct esp_cmd_entry *tagged_cmds[ESP_MAX_TAG]; +}; + +struct esp_target_data { + /* These are the ESP_STP, ESP_SOFF, and ESP_CFG3 register values which + * match the currently negotiated settings for this target. The SCSI + * protocol values are maintained in spi_{offset,period,wide}(starget). + */ + u8 esp_period; + u8 esp_offset; + u8 esp_config3; + + u8 flags; +#define ESP_TGT_WIDE 0x01 +#define ESP_TGT_DISCONNECT 0x02 +#define ESP_TGT_NEGO_WIDE 0x04 +#define ESP_TGT_NEGO_SYNC 0x08 +#define ESP_TGT_CHECK_NEGO 0x40 +#define ESP_TGT_BROKEN 0x80 + + /* When ESP_TGT_CHECK_NEGO is set, on the next scsi command to this + * device we will try to negotiate the following parameters. + */ + u8 nego_goal_period; + u8 nego_goal_offset; + u8 nego_goal_width; + u8 nego_goal_tags; + + struct scsi_target *starget; +}; + +struct esp_event_ent { + u8 type; +#define ESP_EVENT_TYPE_EVENT 0x01 +#define ESP_EVENT_TYPE_CMD 0x02 + u8 val; + + u8 sreg; + u8 seqreg; + u8 sreg2; + u8 ireg; + u8 select_state; + u8 event; + u8 __pad; +}; + +struct esp; +struct esp_driver_ops { + /* Read and write the ESP 8-bit registers. On some + * applications of the ESP chip the registers are at 4-byte + * instead of 1-byte intervals. + */ + void (*esp_write8)(struct esp *esp, u8 val, unsigned long reg); + u8 (*esp_read8)(struct esp *esp, unsigned long reg); + + /* Map and unmap DMA memory. Eventually the driver will be + * converted to the generic DMA API as soon as SBUS is able to + * cope with that. At such time we can remove this. + */ + dma_addr_t (*map_single)(struct esp *esp, void *buf, + size_t sz, int dir); + int (*map_sg)(struct esp *esp, struct scatterlist *sg, + int num_sg, int dir); + void (*unmap_single)(struct esp *esp, dma_addr_t addr, + size_t sz, int dir); + void (*unmap_sg)(struct esp *esp, struct scatterlist *sg, + int num_sg, int dir); + + /* Return non-zero if there is an IRQ pending. Usually this + * status bit lives in the DMA controller sitting in front of + * the ESP. This has to be accurate or else the ESP interrupt + * handler will not run. + */ + int (*irq_pending)(struct esp *esp); + + /* Reset the DMA engine entirely. On return, ESP interrupts + * should be enabled. Often the interrupt enabling is + * controlled in the DMA engine. + */ + void (*reset_dma)(struct esp *esp); + + /* Drain any pending DMA in the DMA engine after a transfer. + * This is for writes to memory. + */ + void (*dma_drain)(struct esp *esp); + + /* Invalidate the DMA engine after a DMA transfer. */ + void (*dma_invalidate)(struct esp *esp); + + /* Setup an ESP command that will use a DMA transfer. + * The 'esp_count' specifies what transfer length should be + * programmed into the ESP transfer counter registers, whereas + * the 'dma_count' is the length that should be programmed into + * the DMA controller. Usually they are the same. If 'write' + * is non-zero, this transfer is a write into memory. 'cmd' + * holds the ESP command that should be issued by calling + * scsi_esp_cmd() at the appropriate time while programming + * the DMA hardware. + */ + void (*send_dma_cmd)(struct esp *esp, u32 dma_addr, u32 esp_count, + u32 dma_count, int write, u8 cmd); + + /* Return non-zero if the DMA engine is reporting an error + * currently. + */ + int (*dma_error)(struct esp *esp); +}; + +#define ESP_MAX_MSG_SZ 8 +#define ESP_EVENT_LOG_SZ 32 + +#define ESP_QUICKIRQ_LIMIT 100 +#define ESP_RESELECT_TAG_LIMIT 2500 + +struct esp { + void __iomem *regs; + void __iomem *dma_regs; + + const struct esp_driver_ops *ops; + + struct Scsi_Host *host; + void *dev; + + struct esp_cmd_entry *active_cmd; + + struct list_head queued_cmds; + struct list_head active_cmds; + + u8 *command_block; + dma_addr_t command_block_dma; + + unsigned int data_dma_len; + + /* The following are used to determine the cause of an IRQ. Upon every + * IRQ entry we synchronize these with the hardware registers. + */ + u8 sreg; + u8 seqreg; + u8 sreg2; + u8 ireg; + + u32 prev_hme_dmacsr; + u8 prev_soff; + u8 prev_stp; + u8 prev_cfg3; + u8 __pad; + + struct list_head esp_cmd_pool; + + struct esp_target_data target[ESP_MAX_TARGET]; + + int fifo_cnt; + u8 fifo[16]; + + struct esp_event_ent esp_event_log[ESP_EVENT_LOG_SZ]; + int esp_event_cur; + + u8 msg_out[ESP_MAX_MSG_SZ]; + int msg_out_len; + + u8 msg_in[ESP_MAX_MSG_SZ]; + int msg_in_len; + + u8 bursts; + u8 config1; + u8 config2; + + u8 scsi_id; + u32 scsi_id_mask; + + enum esp_rev rev; + + u32 flags; +#define ESP_FLAG_DIFFERENTIAL 0x00000001 +#define ESP_FLAG_RESETTING 0x00000002 +#define ESP_FLAG_DOING_SLOWCMD 0x00000004 +#define ESP_FLAG_WIDE_CAPABLE 0x00000008 +#define ESP_FLAG_QUICKIRQ_CHECK 0x00000010 + + u8 select_state; +#define ESP_SELECT_NONE 0x00 /* Not selecting */ +#define ESP_SELECT_BASIC 0x01 /* Select w/o MSGOUT phase */ +#define ESP_SELECT_MSGOUT 0x02 /* Select with MSGOUT */ + + /* When we are not selecting, we are expecting an event. */ + u8 event; +#define ESP_EVENT_NONE 0x00 +#define ESP_EVENT_CMD_START 0x01 +#define ESP_EVENT_CMD_DONE 0x02 +#define ESP_EVENT_DATA_IN 0x03 +#define ESP_EVENT_DATA_OUT 0x04 +#define ESP_EVENT_DATA_DONE 0x05 +#define ESP_EVENT_MSGIN 0x06 +#define ESP_EVENT_MSGIN_MORE 0x07 +#define ESP_EVENT_MSGIN_DONE 0x08 +#define ESP_EVENT_MSGOUT 0x09 +#define ESP_EVENT_MSGOUT_DONE 0x0a +#define ESP_EVENT_STATUS 0x0b +#define ESP_EVENT_FREE_BUS 0x0c +#define ESP_EVENT_CHECK_PHASE 0x0d +#define ESP_EVENT_RESET 0x10 + + /* Probed in esp_get_clock_params() */ + u32 cfact; + u32 cfreq; + u32 ccycle; + u32 ctick; + u32 neg_defp; + u32 sync_defp; + + /* Computed in esp_reset_esp() */ + u32 max_period; + u32 min_period; + u32 radelay; + + /* Slow command state. */ + u8 *cmd_bytes_ptr; + int cmd_bytes_left; + + struct completion *eh_reset; + + struct sbus_dma *dma; +}; + +#define host_to_esp(host) ((struct esp *)(host)->hostdata) + +/* A front-end driver for the ESP chip should do the following in + * it's device probe routine: + * 1) Allocate the host and private area using scsi_host_alloc() + * with size 'sizeof(struct esp)'. The first argument to + * scsi_host_alloc() should be &scsi_esp_template. + * 2) Set host->max_id as appropriate. + * 3) Set esp->host to the scsi_host itself, and esp->dev + * to the device object pointer. + * 4) Hook up esp->ops to the front-end implementation. + * 5) If the ESP chip supports wide transfers, set ESP_FLAG_WIDE_CAPABLE + * in esp->flags. + * 6) Map the DMA and ESP chip registers. + * 7) DMA map the ESP command block, store the DMA address + * in esp->command_block_dma. + * 8) Register the scsi_esp_intr() interrupt handler. + * 9) Probe for and provide the following chip properties: + * esp->scsi_id (assign to esp->host->this_id too) + * esp->scsi_id_mask + * If ESP bus is differential, set ESP_FLAG_DIFFERENTIAL + * esp->cfreq + * DMA burst bit mask in esp->bursts, if necessary + * 10) Perform any actions necessary before the ESP device can + * be programmed for the first time. On some configs, for + * example, the DMA engine has to be reset before ESP can + * be programmed. + * 11) If necessary, call dev_set_drvdata() as needed. + * 12) Call scsi_esp_register() with prepared 'esp' structure + * and a device pointer if possible. + * 13) Check scsi_esp_register() return value, release all resources + * if an error was returned. + */ +extern struct scsi_host_template scsi_esp_template; +extern int scsi_esp_register(struct esp *, struct device *); + +extern void scsi_esp_unregister(struct esp *); +extern irqreturn_t scsi_esp_intr(int, void *); +extern void scsi_esp_cmd(struct esp *, u8); + +#endif /* !(_ESP_SCSI_H) */ |