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linux/drivers/scsi/NCR53C9x.h
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

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/* NCR53C9x.c: Defines and structures for the NCR53C9x generic driver.
*
* Originaly 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)
*
* Generalization by Jesper Skov (jskov@cygnus.co.uk)
*
* More generalization (for i386 stuff) by Tymm Twillman (tymm@computer.org)
*/
#ifndef NCR53C9X_H
#define NCR53C9X_H
#include <linux/interrupt.h>
/* djweis for mac driver */
#if defined(CONFIG_MAC)
#define PAD_SIZE 15
#else
#define PAD_SIZE 3
#endif
/* Handle multiple hostadapters on Amiga
* generally PAD_SIZE = 3
* but there is one exception: Oktagon (PAD_SIZE = 1) */
#if defined(CONFIG_OKTAGON_SCSI) || defined(CONFIG_OKTAGON_SCSI_MODULE)
#undef PAD_SIZE
#if defined(CONFIG_BLZ1230_SCSI) || defined(CONFIG_BLZ1230_SCSI_MODULE) || \
defined(CONFIG_BLZ2060_SCSI) || defined(CONFIG_BLZ2060_SCSI_MODULE) || \
defined(CONFIG_CYBERSTORM_SCSI) || defined(CONFIG_CYBERSTORM_SCSI_MODULE) || \
defined(CONFIG_CYBERSTORMII_SCSI) || defined(CONFIG_CYBERSTORMII_SCSI_MODULE) || \
defined(CONFIG_FASTLANE_SCSI) || defined(CONFIG_FASTLANE_SCSI_MODULE)
#define MULTIPLE_PAD_SIZES
#else
#define PAD_SIZE 1
#endif
#endif
/* Macros for debugging messages */
#define DEBUG_ESP
/* #define DEBUG_ESP_DATA */
/* #define DEBUG_ESP_QUEUE */
/* #define DEBUG_ESP_DISCONNECT */
/* #define DEBUG_ESP_STATUS */
/* #define DEBUG_ESP_PHASES */
/* #define DEBUG_ESP_WORKBUS */
/* #define DEBUG_STATE_MACHINE */
/* #define DEBUG_ESP_CMDS */
/* #define DEBUG_ESP_IRQS */
/* #define DEBUG_SDTR */
/* #define DEBUG_ESP_SG */
/* Use the following to sprinkle debugging messages in a way which
* suits you if combinations of the above become too verbose when
* trying to track down a specific problem.
*/
/* #define DEBUG_ESP_MISC */
#if defined(DEBUG_ESP)
#define ESPLOG(foo) printk foo
#else
#define ESPLOG(foo)
#endif /* (DEBUG_ESP) */
#if defined(DEBUG_ESP_DATA)
#define ESPDATA(foo) printk foo
#else
#define ESPDATA(foo)
#endif
#if defined(DEBUG_ESP_QUEUE)
#define ESPQUEUE(foo) printk foo
#else
#define ESPQUEUE(foo)
#endif
#if defined(DEBUG_ESP_DISCONNECT)
#define ESPDISC(foo) printk foo
#else
#define ESPDISC(foo)
#endif
#if defined(DEBUG_ESP_STATUS)
#define ESPSTAT(foo) printk foo
#else
#define ESPSTAT(foo)
#endif
#if defined(DEBUG_ESP_PHASES)
#define ESPPHASE(foo) printk foo
#else
#define ESPPHASE(foo)
#endif
#if defined(DEBUG_ESP_WORKBUS)
#define ESPBUS(foo) printk foo
#else
#define ESPBUS(foo)
#endif
#if defined(DEBUG_ESP_IRQS)
#define ESPIRQ(foo) printk foo
#else
#define ESPIRQ(foo)
#endif
#if defined(DEBUG_SDTR)
#define ESPSDTR(foo) printk foo
#else
#define ESPSDTR(foo)
#endif
#if defined(DEBUG_ESP_MISC)
#define ESPMISC(foo) printk foo
#else
#define ESPMISC(foo)
#endif
/*
* padding for register structure
*/
#ifdef CONFIG_JAZZ_ESP
#define EREGS_PAD(n)
#else
#ifndef MULTIPLE_PAD_SIZES
#define EREGS_PAD(n) unchar n[PAD_SIZE];
#endif
#endif
/* 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.
*/
#if !defined(__i386__) && !defined(__x86_64__)
#ifndef MULTIPLE_PAD_SIZES
#ifdef CONFIG_CPU_HAS_WB
#include <asm/wbflush.h>
#define esp_write(__reg, __val) do{(__reg) = (__val); wbflush();} while(0)
#else
#define esp_write(__reg, __val) ((__reg) = (__val))
#endif
#define esp_read(__reg) (__reg)
struct ESP_regs {
/* Access Description Offset */
volatile unchar esp_tclow; /* rw Low bits of the transfer count 0x00 */
EREGS_PAD(tlpad1);
volatile unchar esp_tcmed; /* rw Mid bits of the transfer count 0x04 */
EREGS_PAD(fdpad);
volatile unchar esp_fdata; /* rw FIFO data bits 0x08 */
EREGS_PAD(cbpad);
volatile unchar esp_cmnd; /* rw SCSI command bits 0x0c */
EREGS_PAD(stpad);
volatile unchar esp_status; /* ro ESP status register 0x10 */
#define esp_busid esp_status /* wo Bus ID for select/reselect 0x10 */
EREGS_PAD(irqpd);
volatile unchar esp_intrpt; /* ro Kind of interrupt 0x14 */
#define esp_timeo esp_intrpt /* wo Timeout value for select/resel 0x14 */
EREGS_PAD(sspad);
volatile unchar esp_sstep; /* ro Sequence step register 0x18 */
#define esp_stp esp_sstep /* wo Transfer period per sync 0x18 */
EREGS_PAD(ffpad);
volatile unchar esp_fflags; /* ro Bits of current FIFO info 0x1c */
#define esp_soff esp_fflags /* wo Sync offset 0x1c */
EREGS_PAD(cf1pd);
volatile unchar esp_cfg1; /* rw First configuration register 0x20 */
EREGS_PAD(cfpad);
volatile unchar esp_cfact; /* wo Clock conversion factor 0x24 */
EREGS_PAD(ctpad);
volatile unchar esp_ctest; /* wo Chip test register 0x28 */
EREGS_PAD(cf2pd);
volatile unchar esp_cfg2; /* rw Second configuration register 0x2c */
EREGS_PAD(cf3pd);
/* The following is only found on the 53C9X series SCSI chips */
volatile unchar esp_cfg3; /* rw Third configuration register 0x30 */
EREGS_PAD(cf4pd);
volatile unchar esp_cfg4; /* rw Fourth configuration register 0x34 */
EREGS_PAD(thpd);
/* The following is found on all chips except the NCR53C90 (ESP100) */
volatile unchar esp_tchi; /* rw High bits of transfer count 0x38 */
#define esp_uid esp_tchi /* ro Unique ID code 0x38 */
EREGS_PAD(fgpad);
volatile unchar esp_fgrnd; /* rw Data base for fifo 0x3c */
};
#else /* MULTIPLE_PAD_SIZES */
#define esp_write(__reg, __val) (*(__reg) = (__val))
#define esp_read(__reg) (*(__reg))
struct ESP_regs {
unsigned char io_addr[64]; /* dummy */
/* Access Description Offset */
#define esp_tclow io_addr /* rw Low bits of the transfer count 0x00 */
#define esp_tcmed io_addr + (1<<(esp->shift)) /* rw Mid bits of the transfer count 0x04 */
#define esp_fdata io_addr + (2<<(esp->shift)) /* rw FIFO data bits 0x08 */
#define esp_cmnd io_addr + (3<<(esp->shift)) /* rw SCSI command bits 0x0c */
#define esp_status io_addr + (4<<(esp->shift)) /* ro ESP status register 0x10 */
#define esp_busid esp_status /* wo Bus ID for select/reselect 0x10 */
#define esp_intrpt io_addr + (5<<(esp->shift)) /* ro Kind of interrupt 0x14 */
#define esp_timeo esp_intrpt /* wo Timeout value for select/resel 0x14 */
#define esp_sstep io_addr + (6<<(esp->shift)) /* ro Sequence step register 0x18 */
#define esp_stp esp_sstep /* wo Transfer period per sync 0x18 */
#define esp_fflags io_addr + (7<<(esp->shift)) /* ro Bits of current FIFO info 0x1c */
#define esp_soff esp_fflags /* wo Sync offset 0x1c */
#define esp_cfg1 io_addr + (8<<(esp->shift)) /* rw First configuration register 0x20 */
#define esp_cfact io_addr + (9<<(esp->shift)) /* wo Clock conversion factor 0x24 */
#define esp_ctest io_addr + (10<<(esp->shift)) /* wo Chip test register 0x28 */
#define esp_cfg2 io_addr + (11<<(esp->shift)) /* rw Second configuration register 0x2c */
/* The following is only found on the 53C9X series SCSI chips */
#define esp_cfg3 io_addr + (12<<(esp->shift)) /* rw Third configuration register 0x30 */
#define esp_cfg4 io_addr + (13<<(esp->shift)) /* rw Fourth configuration register 0x34 */
/* The following is found on all chips except the NCR53C90 (ESP100) */
#define esp_tchi io_addr + (14<<(esp->shift)) /* rw High bits of transfer count 0x38 */
#define esp_uid esp_tchi /* ro Unique ID code 0x38 */
#define esp_fgrnd io_addr + (15<<(esp->shift)) /* rw Data base for fifo 0x3c */
};
#endif
#else /* !defined(__i386__) && !defined(__x86_64__) */
#define esp_write(__reg, __val) outb((__val), (__reg))
#define esp_read(__reg) inb((__reg))
struct ESP_regs {
unsigned int io_addr;
/* Access Description Offset */
#define esp_tclow io_addr /* rw Low bits of the transfer count 0x00 */
#define esp_tcmed io_addr + 1 /* rw Mid bits of the transfer count 0x04 */
#define esp_fdata io_addr + 2 /* rw FIFO data bits 0x08 */
#define esp_cmnd io_addr + 3 /* rw SCSI command bits 0x0c */
#define esp_status io_addr + 4 /* ro ESP status register 0x10 */
#define esp_busid esp_status /* wo Bus ID for select/reselect 0x10 */
#define esp_intrpt io_addr + 5 /* ro Kind of interrupt 0x14 */
#define esp_timeo esp_intrpt /* wo Timeout value for select/resel 0x14 */
#define esp_sstep io_addr + 6 /* ro Sequence step register 0x18 */
#define esp_stp esp_sstep /* wo Transfer period per sync 0x18 */
#define esp_fflags io_addr + 7 /* ro Bits of current FIFO info 0x1c */
#define esp_soff esp_fflags /* wo Sync offset 0x1c */
#define esp_cfg1 io_addr + 8 /* rw First configuration register 0x20 */
#define esp_cfact io_addr + 9 /* wo Clock conversion factor 0x24 */
#define esp_ctest io_addr + 10 /* wo Chip test register 0x28 */
#define esp_cfg2 io_addr + 11 /* rw Second configuration register 0x2c */
/* The following is only found on the 53C9X series SCSI chips */
#define esp_cfg3 io_addr + 12 /* rw Third configuration register 0x30 */
#define esp_cfg4 io_addr + 13 /* rw Fourth configuration register 0x34 */
/* The following is found on all chips except the NCR53C90 (ESP100) */
#define esp_tchi io_addr + 14 /* rw High bits of transfer count 0x38 */
#define esp_uid esp_tchi /* ro Unique ID code 0x38 */
#define esp_fgrnd io_addr + 15 /* rw Data base for fifo 0x3c */
};
#endif /* !defined(__i386__) && !defined(__x86_64__) */
/* 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,
fas366 = 0x06,
fas216 = 0x07,
fsc = 0x08, /* SYM53C94-2 */
espunknown = 0x09
};
/* 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;
};
/* We get one of these for each ESP probed. */
struct NCR_ESP {
struct NCR_ESP *next; /* Next ESP on probed or NULL */
struct ESP_regs *eregs; /* All esp registers */
int dma; /* Who I do transfers with. */
void *dregs; /* And his registers. */
struct Scsi_Host *ehost; /* Backpointer to SCSI Host */
void *edev; /* Pointer to controller base/SBus */
int esp_id; /* Unique per-ESP ID number */
/* ESP Configuration Registers */
unsigned char config1; /* Copy of the 1st config register */
unsigned char config2; /* Copy of the 2nd config register */
unsigned char 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 unchar *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.
*/
unchar ireg; /* Copy of ESP interrupt register */
unchar sreg; /* Same for ESP status register */
unchar seqreg; /* The ESP sequence register */
/* The following is set when a premature interrupt condition is detected
* in some FAS revisions.
*/
unchar fas_premature_intr_workaround;
/* 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.
*/
unchar prev_soff, prev_stp, prev_cfg3;
/* 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 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 */
/* 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 */
unchar espcmdlog[32]; /* Log of current esp cmds sent. */
unchar espcmdent; /* Current entry in esp cmd log. */
/* Misc. info about this ESP */
enum esp_rev erev; /* ESP revision */
int irq; /* 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 slot; /* Slot the adapter occupies */
/* Our command queues, only one cmd lives in the current_SC queue. */
Scsi_Cmnd *issue_SC; /* Commands to be issued */
Scsi_Cmnd *current_SC; /* Who is currently working the bus */
Scsi_Cmnd *disconnected_SC; /* Commands disconnected from the bus */
/* Message goo */
unchar cur_msgout[16];
unchar cur_msgin[16];
unchar prevmsgout, prevmsgin;
unchar msgout_len, msgin_len;
unchar msgout_ctr, msgin_ctr;
/* States that we cannot keep in the per cmd structure because they
* cannot be assosciated with any specific command.
*/
unchar resetting_bus;
wait_queue_head_t reset_queue;
unchar do_pio_cmds; /* Do command transfer with pio */
/* How much bits do we have to shift the registers */
unsigned char shift;
/* Functions handling DMA
*/
/* Required functions */
int (*dma_bytes_sent)(struct NCR_ESP *, int);
int (*dma_can_transfer)(struct NCR_ESP *, Scsi_Cmnd *);
void (*dma_dump_state)(struct NCR_ESP *);
void (*dma_init_read)(struct NCR_ESP *, __u32, int);
void (*dma_init_write)(struct NCR_ESP *, __u32, int);
void (*dma_ints_off)(struct NCR_ESP *);
void (*dma_ints_on)(struct NCR_ESP *);
int (*dma_irq_p)(struct NCR_ESP *);
int (*dma_ports_p)(struct NCR_ESP *);
void (*dma_setup)(struct NCR_ESP *, __u32, int, int);
/* Optional functions (i.e. may be initialized to 0) */
void (*dma_barrier)(struct NCR_ESP *);
void (*dma_drain)(struct NCR_ESP *);
void (*dma_invalidate)(struct NCR_ESP *);
void (*dma_irq_entry)(struct NCR_ESP *);
void (*dma_irq_exit)(struct NCR_ESP *);
void (*dma_led_off)(struct NCR_ESP *);
void (*dma_led_on)(struct NCR_ESP *);
void (*dma_poll)(struct NCR_ESP *, unsigned char *);
void (*dma_reset)(struct NCR_ESP *);
/* Optional virtual DMA functions */
void (*dma_mmu_get_scsi_one)(struct NCR_ESP *, Scsi_Cmnd *);
void (*dma_mmu_get_scsi_sgl)(struct NCR_ESP *, Scsi_Cmnd *);
void (*dma_mmu_release_scsi_one)(struct NCR_ESP *, Scsi_Cmnd *);
void (*dma_mmu_release_scsi_sgl)(struct NCR_ESP *, Scsi_Cmnd *);
void (*dma_advance_sg)(Scsi_Cmnd *);
};
/* 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+fsc chips */
#define ESP_CONFIG2_DMAPARITY 0x01 /* enable DMA Parity (200,236,fsc) */
#define ESP_CONFIG2_REGPARITY 0x02 /* enable reg Parity (200,236,fsc) */
#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,fsc) */
#define ESP_CONFIG2_FENAB 0x40 /* Enable features (fas100,esp216,fsc) */
#define ESP_CONFIG2_SPL 0x40 /* Enable status-phase latch (esp236) */
#define ESP_CONFIG2_RFB 0x80 /* Reserve FIFO byte (fsc) */
#define ESP_CONFIG2_MAGIC 0xe0 /* Invalid bits... */
/* ESP config register 3 read-write, found only esp236+fas236+fas100a+fsc chips */
#define ESP_CONFIG3_FCLOCK 0x01 /* FAST SCSI clock rate (esp100a/fas366) */
#define ESP_CONFIG3_TEM 0x01 /* Enable thresh-8 mode (esp/fas236/fsc) */
#define ESP_CONFIG3_FAST 0x02 /* Enable FAST SCSI (esp100a) */
#define ESP_CONFIG3_ADMA 0x02 /* Enable alternate-dma (esp/fas236/fsc) */
#define ESP_CONFIG3_TENB 0x04 /* group2 SCSI2 support (esp100a) */
#define ESP_CONFIG3_SRB 0x04 /* Save residual byte (esp/fas236/fsc) */
#define ESP_CONFIG3_TMS 0x08 /* Three-byte msg's ok (esp100a) */
#define ESP_CONFIG3_FCLK 0x08 /* Fast SCSI clock rate (esp/fas236/fsc) */
#define ESP_CONFIG3_IDMSG 0x10 /* ID message checking (esp100a) */
#define ESP_CONFIG3_FSCSI 0x10 /* Enable FAST SCSI (esp/fas236/fsc) */
#define ESP_CONFIG3_GTM 0x20 /* group2 SCSI2 support (esp/fas236/fsc) */
#define ESP_CONFIG3_TBMS 0x40 /* Three-byte msg's ok (esp/fas236/fsc) */
#define ESP_CONFIG3_IMS 0x80 /* ID msg chk'ng (esp/fas236/fsc) */
/* ESP config register 4 read-write, found only on fsc chips */
#define ESP_CONFIG4_BBTE 0x01 /* Back-to-Back transfer enable */
#define ESP_CONFIG4_TEST 0x02 /* Transfer counter test mode */
#define ESP_CONFIG4_EAN 0x04 /* Enable Active Negotiation */
/* 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 */
#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, it is a reserved
* bit on old revs of the ESP (ESP100, ESP100A, FAS100A).
*/
#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 */
/* 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
#define ESP_STEP_SOM 0x08 /* Synchronous Offset Max */
/* 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+fsc only */
#define ESP_UID_F100A 0x00 /* FAS100A */
#define ESP_UID_F236 0x02 /* FAS236 */
#define ESP_UID_FSC 0xa2 /* NCR53CF9x-2 */
#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,fsc) */
#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 */
#define ESP_BUS_TIMEOUT 275 /* In milli-seconds */
#define ESP_TIMEO_CONST 8192
#define FSC_TIMEO_CONST 7668
#define ESP_NEG_DEFP(mhz, cfact) \
((ESP_BUS_TIMEOUT * ((mhz) / 1000)) / (8192 * (cfact)))
#define FSC_NEG_DEFP(mhz, cfact) \
((ESP_BUS_TIMEOUT * ((mhz) / 1000)) / (7668 * (cfact)))
#define ESP_MHZ_TO_CYCLE(mhertz) ((1000000000) / ((mhertz) / 1000))
#define ESP_TICK(ccf, cycle) ((7682 * (ccf) * (cycle) / 1000))
/* UGLY, UGLY, UGLY! */
extern int nesps, esps_in_use, esps_running;
/* For our interrupt engine. */
#define for_each_esp(esp) \
for((esp) = espchain; (esp); (esp) = (esp)->next)
/* External functions */
extern void esp_bootup_reset(struct NCR_ESP *esp, struct ESP_regs *eregs);
extern struct NCR_ESP *esp_allocate(struct scsi_host_template *, void *);
extern void esp_deallocate(struct NCR_ESP *);
extern void esp_release(void);
extern void esp_initialize(struct NCR_ESP *);
extern irqreturn_t esp_intr(int, void *);
extern const char *esp_info(struct Scsi_Host *);
extern int esp_queue(Scsi_Cmnd *, void (*done)(Scsi_Cmnd *));
extern int esp_abort(Scsi_Cmnd *);
extern int esp_reset(Scsi_Cmnd *);
extern int esp_proc_info(struct Scsi_Host *shost, char *buffer, char **start, off_t offset, int length,
int inout);
extern int esp_slave_alloc(struct scsi_device *);
extern void esp_slave_destroy(struct scsi_device *);
#endif /* !(NCR53C9X_H) */
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