| /* 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 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 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; |
| }; |
| |
| /* 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) */ |
