/******************************************************************************
** Device driver for the PCI-SCSI NCR538XX controller family.
**
** Copyright (C) 1994 Wolfgang Stanglmeier
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**-----------------------------------------------------------------------------
**
** This driver has been ported to Linux from the FreeBSD NCR53C8XX driver
** and is currently maintained by
**
** Gerard Roudier <groudier@free.fr>
**
** Being given that this driver originates from the FreeBSD version, and
** in order to keep synergy on both, any suggested enhancements and corrections
** received on Linux are automatically a potential candidate for the FreeBSD
** version.
**
** The original driver has been written for 386bsd and FreeBSD by
** Wolfgang Stanglmeier <wolf@cologne.de>
** Stefan Esser <se@mi.Uni-Koeln.de>
**
** And has been ported to NetBSD by
** Charles M. Hannum <mycroft@gnu.ai.mit.edu>
**
**-----------------------------------------------------------------------------
**
** Brief history
**
** December 10 1995 by Gerard Roudier:
** Initial port to Linux.
**
** June 23 1996 by Gerard Roudier:
** Support for 64 bits architectures (Alpha).
**
** November 30 1996 by Gerard Roudier:
** Support for Fast-20 scsi.
** Support for large DMA fifo and 128 dwords bursting.
**
** February 27 1997 by Gerard Roudier:
** Support for Fast-40 scsi.
** Support for on-Board RAM.
**
** May 3 1997 by Gerard Roudier:
** Full support for scsi scripts instructions pre-fetching.
**
** May 19 1997 by Richard Waltham <dormouse@farsrobt.demon.co.uk>:
** Support for NvRAM detection and reading.
**
** August 18 1997 by Cort <cort@cs.nmt.edu>:
** Support for Power/PC (Big Endian).
**
** June 20 1998 by Gerard Roudier
** Support for up to 64 tags per lun.
** O(1) everywhere (C and SCRIPTS) for normal cases.
** Low PCI traffic for command handling when on-chip RAM is present.
** Aggressive SCSI SCRIPTS optimizations.
**
** 2005 by Matthew Wilcox and James Bottomley
** PCI-ectomy. This driver now supports only the 720 chip (see the
** NCR_Q720 and zalon drivers for the bus probe logic).
**
*******************************************************************************
*/
/*
** Supported SCSI-II features:
** Synchronous negotiation
** Wide negotiation (depends on the NCR Chip)
** Enable disconnection
** Tagged command queuing
** Parity checking
** Etc...
**
** Supported NCR/SYMBIOS chips:
** 53C720 (Wide, Fast SCSI-2, intfly problems)
*/
/* Name and version of the driver */
#define SCSI_NCR_DRIVER_NAME "ncr53c8xx-3.4.3g"
#define SCSI_NCR_DEBUG_FLAGS (0)
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/spinlock.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <linux/types.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/system.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_spi.h>
#include "ncr53c8xx.h"
#define NAME53C8XX "ncr53c8xx"
/*==========================================================
**
** Debugging tags
**
**==========================================================
*/
#define DEBUG_ALLOC (0x0001)
#define DEBUG_PHASE (0x0002)
#define DEBUG_QUEUE (0x0008)
#define DEBUG_RESULT (0x0010)
#define DEBUG_POINTER (0x0020)
#define DEBUG_SCRIPT (0x0040)
#define DEBUG_TINY (0x0080)
#define DEBUG_TIMING (0x0100)
#define DEBUG_NEGO (0x0200)
#define DEBUG_TAGS (0x0400)
#define DEBUG_SCATTER (0x0800)
#define DEBUG_IC (0x1000)
/*
** Enable/Disable debug messages.
** Can be changed at runtime too.
*/
#ifdef SCSI_NCR_DEBUG_INFO_SUPPORT
static int ncr_debug = SCSI_NCR_DEBUG_FLAGS;
#define DEBUG_FLAGS ncr_debug
#else
#define DEBUG_FLAGS SCSI_NCR_DEBUG_FLAGS
#endif
static inline struct list_head *ncr_list_pop(struct list_head *head)
{
if (!list_empty(head)) {
struct list_head *elem = head->next;
list_del(elem);
return elem;
}
return NULL;
}
/*==========================================================
**
** Simple power of two buddy-like allocator.
**
** This simple code is not intended to be fast, but to
** provide power of 2 aligned memory allocations.
** Since the SCRIPTS processor only supplies 8 bit
** arithmetic, this allocator allows simple and fast
** address calculations from the SCRIPTS code.
** In addition, cache line alignment is guaranteed for
** power of 2 cache line size.
** Enhanced in linux-2.3.44 to provide a memory pool
** per pcidev to support dynamic dma mapping. (I would
** have preferred a real bus abstraction, btw).
**
**==========================================================
*/
#define MEMO_SHIFT 4 /* 16 bytes minimum memory chunk */
#if PAGE_SIZE >= 8192
#define MEMO_PAGE_ORDER 0 /* 1 PAGE maximum */
#else
#define MEMO_PAGE_ORDER 1 /* 2 PAGES maximum */
#endif
#define MEMO_FREE_UNUSED /* Free unused pages immediately */
#define MEMO_WARN 1
#define MEMO_GFP_FLAGS GFP_ATOMIC
#define MEMO_CLUSTER_SHIFT (PAGE_SHIFT+MEMO_PAGE_ORDER)
#define MEMO_CLUSTER_SIZE (1UL << MEMO_CLUSTER_SHIFT)
#define MEMO_CLUSTER_MASK (MEMO_CLUSTER_SIZE-1)
typedef u_long m_addr_t; /* Enough bits to bit-hack addresses */
typedef struct device *m_bush_t; /* Something that addresses DMAable */
typedef struct m_link { /* Link between free memory chunks */
struct m_link *next;
} m_link_s;
typedef struct m_vtob { /* Virtual to Bus address translation */
struct m_vtob *next;
m_addr_t vaddr;
m_addr_t baddr;
} m_vtob_s;
#define VTOB_HASH_SHIFT 5
#define VTOB_HASH_SIZE (1UL << VTOB_HASH_SHIFT)
#define VTOB_HASH_MASK (VTOB_HASH_SIZE-1)
#define VTOB_HASH_CODE(m) \
((((m_addr_t) (m)) >> MEMO_CLUSTER_SHIFT) & VTOB_HASH_MASK)
typedef struct m_pool { /* Memory pool of a given kind */
m_bush_t bush;
m_addr_t (*getp)(struct m_pool *);
void (*freep)(struct m_pool *, m_addr_t);
int nump;
m_vtob_s *(vtob[VTOB_HASH_SIZE]);
struct m_pool *next;
struct m_link h[PAGE_SHIFT-MEMO_SHIFT+MEMO_PAGE_ORDER+1];
} m_pool_s;
static void *___m_alloc(m_pool_s *mp, int size)
{
int i = 0;
int s = (1 << MEMO_SHIFT);
int j;
m_addr_t a;
m_link_s *h = mp->h;
if (size > (PAGE_SIZE << MEMO_PAGE_ORDER))
return NULL;
while (size > s) {
s <<= 1;
++i;
}
j = i;
while (!h[j].next) {
if (s == (PAGE_SIZE << MEMO_PAGE_ORDER)) {
h[j].next = (m_link_s *)mp->getp(mp);
if (h[j].next)
h[j].next->next = NULL;
break;
}
++j;
s <<= 1;
}
a = (m_addr_t) h[j].next;
if (a) {
h[j].next = h[j].next->next;
while (j > i) {
j -= 1;
s >>= 1;
h[j].next = (m_link_s *) (a+s);
h[j].next->next = NULL;
}
}
#ifdef DEBUG
printk("___m_alloc(%d) = %p\n", size, (void *) a);
#endif
return (void *) a;
}
static void ___m_free(m_pool_s *mp, void *ptr, int size)
{
int i = 0;
int s = (1 << MEMO_SHIFT);
m_link_s *q;
m_addr_t a, b;
m_link_s *h = mp->h;
#ifdef DEBUG
printk("___m_free(%p, %d)\n", ptr, size);
#endif
if (size > (PAGE_SIZE << MEMO_PAGE_ORDER))
return;
while (size > s) {
s <<= 1;
++i;
}
a = (m_addr_t) ptr;
while (1) {
#ifdef MEMO_FREE_UNUSED
if (s == (PAGE_SIZE << MEMO_PAGE_ORDER)) {
mp->freep(mp, a);
break;
}
#endif
b = a ^ s;
q = &h[i];
while (q->next && q->next != (m_link_s *) b) {
q = q->next;
}
if (!q->next) {
((m_link_s *) a)->next = h[i].next;
h[i].next = (m_link_s *) a;
break;
}
q->next = q->next->next;
a = a & b;
s <<= 1;
++i;
}
}
static DEFINE_SPINLOCK(ncr53c8xx_lock);
static void *__m_calloc2(m_pool_s *mp, int size, char *name, int uflags)
{
void *p;
p = ___m_alloc(mp, size);
if (DEBUG_FLAGS & DEBUG_ALLOC)
printk ("new %-10s[%4d] @%p.\n", name, size, p);
if (p)
memset(p, 0, size);
else if (uflags & MEMO_WARN)
printk (NAME53C8XX ": failed to allocate %s[%d]\n", name, size);
return p;
}
#define __m_calloc(mp, s, n) __m_calloc2(mp, s, n, MEMO_WARN)
static void __m_free(m_pool_s *mp, void *ptr, int size, char *name)
{
if (DEBUG_FLAGS & DEBUG_ALLOC)
printk ("freeing %-10s[%4d] @%p.\n", name, size, ptr);
___m_free(mp, ptr, size);
}
/*
* With pci bus iommu support, we use a default pool of unmapped memory
* for memory we donnot need to DMA from/to and one pool per pcidev for
* memory accessed by the PCI chip. `mp0' is the default not DMAable pool.
*/
static m_addr_t ___mp0_getp(m_pool_s *mp)
{
m_addr_t m = __get_free_pages(MEMO_GFP_FLAGS, MEMO_PAGE_ORDER);
if (m)
++mp->nump;
return m;
}
static void ___mp0_freep(m_pool_s *mp, m_addr_t m)
{
free_pages(m, MEMO_PAGE_ORDER);
--mp->nump;
}
static m_pool_s mp0 = {NULL, ___mp0_getp, ___mp0_freep};
/*
* DMAable pools.
*/
/*
* With pci bus iommu support, we maintain one pool per pcidev and a
* hashed reverse table for virtual to bus physical address translations.
*/
static m_addr_t ___dma_getp(m_pool_s *mp)
{
m_addr_t vp;
m_vtob_s *vbp;
vbp = __m_calloc(&mp0, sizeof(*vbp), "VTOB");
if (vbp) {
dma_addr_t daddr;
vp = (m_addr_t) dma_alloc_coherent(mp->bush,
PAGE_SIZE<<MEMO_PAGE_ORDER,
&daddr, GFP_ATOMIC);
if (vp) {
int hc = VTOB_HASH_CODE(vp);
vbp->vaddr = vp;
vbp->baddr = daddr;
vbp->next = mp->vtob[hc];
mp->vtob[hc] = vbp;
++mp->nump;
return vp;
}
}
if (vbp)
__m_free(&mp0, vbp, sizeof(*vbp), "VTOB");
return 0;
}
static void ___dma_freep(m_pool_s *mp, m_addr_t m)
{
m_vtob_s **vbpp, *vbp;
int hc = VTOB_HASH_CODE(m);
vbpp = &mp->vtob[hc];
while (*vbpp && (*vbpp)->vaddr != m)
vbpp = &(*vbpp)->next;
if (*vbpp) {
vbp = *vbpp;
*vbpp = (*vbpp)->next;
dma_free_coherent(mp->bush, PAGE_SIZE<<MEMO_PAGE_ORDER,
(void *)vbp->vaddr, (dma_addr_t)vbp->baddr);
__m_free(&mp0, vbp, sizeof(*vbp), "VTOB");
--mp->nump;
}
}
static inline m_pool_s *___get_dma_pool(m_bush_t bush)
{
m_pool_s *mp;
for (mp = mp0.next; mp && mp->bush != bush; mp = mp->next);
return mp;
}
static m_pool_s *___cre_dma_pool(m_bush_t bush)
{
m_pool_s *mp;
mp = __m_calloc(&mp0, sizeof(*mp), "MPOOL");
if (mp) {
memset(mp, 0, sizeof(*mp));
mp->bush = bush;
mp->getp = ___dma_getp;
mp->freep = ___dma_freep;
mp->next = mp0.next;
mp0.next = mp;
}
return mp;
}
static void ___del_dma_pool(m_pool_s *p)
{
struct m_pool **pp = &mp0.next;
while (*pp && *pp != p)
pp = &(*pp)->next;
if (*pp) {
*pp = (*pp)->next;
__m_free(&mp0, p, sizeof(*p), "MPOOL");
}
}
static void *__m_calloc_dma(m_bush_t bush, int size, char *name)
{
u_long flags;
struct m_pool *mp;
void *m = NULL;
spin_lock_irqsave(&ncr53c8xx_lock, flags);
mp = ___get_dma_pool(bush);
if (!mp)
mp = ___cre_dma_pool(bush);
if (mp)
m = __m_calloc(mp, size, name);
if (mp && !mp->nump)
___del_dma_pool(mp);
spin_unlock_irqrestore(&ncr53c8xx_lock, flags);
return m;
}
static void __m_free_dma(m_bush_t bush, void *m, int size, char *name)
{
u_long flags;
struct m_pool *mp;
spin_lock_irqsave(&ncr53c8xx_lock, flags);
mp = ___get_dma_pool(bush);
if (mp)
__m_free(mp, m, size, name);
if (mp && !mp->nump)
___del_dma_pool(mp);
spin_unlock_irqrestore(&ncr53c8xx_lock, flags);
}
static m_addr_t __vtobus(m_bush_t bush, void *m)
{
u_long flags;
m_pool_s *mp;
int hc = VTOB_HASH_CODE(m);
m_vtob_s *vp = NULL;
m_addr_t a = ((m_addr_t) m) & ~MEMO_CLUSTER_MASK;
spin_lock_irqsave(&ncr53c8xx_lock, flags);
mp = ___get_dma_pool(bush);
if (mp) {
vp = mp->vtob[hc];
while (vp && (m_addr_t) vp->vaddr != a)
vp = vp->next;
}
spin_unlock_irqrestore(&ncr53c8xx_lock, flags);
return vp ? vp->baddr + (((m_addr_t) m) - a) : 0;
}
#define _m_calloc_dma(np, s, n) __m_calloc_dma(np->dev, s, n)
#define _m_free_dma(np, p, s, n) __m_free_dma(np->dev, p, s, n)
#define m_calloc_dma(s, n) _m_calloc_dma(np, s, n)
#define m_free_dma(p, s, n) _m_free_dma(np, p, s, n)
#define _vtobus(np, p) __vtobus(np->dev, p)
#define vtobus(p) _vtobus(np, p)
/*
* Deal with DMA mapping/unmapping.
*/
/* To keep track of the dma mapping (sg/single) that has been set */
#define __data_mapped SCp.phase
#define __data_mapping SCp.have_data_in
static void __unmap_scsi_data(struct device *dev, struct scsi_cmnd *cmd)
{
switch(cmd->__data_mapped) {
case 2:
scsi_dma_unmap(cmd);
break;
}
cmd->__data_mapped = 0;
}
static int __map_scsi_sg_data(struct device *dev, struct scsi_cmnd *cmd)
{
int use_sg;
use_sg = scsi_dma_map(cmd);
if (!use_sg)
return 0;
cmd->__data_mapped = 2;
cmd->__data_mapping = use_sg;
return use_sg;
}
#define unmap_scsi_data(np, cmd) __unmap_scsi_data(np->dev, cmd)
#define map_scsi_sg_data(np, cmd) __map_scsi_sg_data(np->dev, cmd)
/*==========================================================
**
** Driver setup.
**
** This structure is initialized from linux config
** options. It can be overridden at boot-up by the boot
** command line.
**
**==========================================================
*/
static struct ncr_driver_setup
driver_setup = SCSI_NCR_DRIVER_SETUP;
#ifndef MODULE
#ifdef SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT
static struct ncr_driver_setup
driver_safe_setup __initdata = SCSI_NCR_DRIVER_SAFE_SETUP;
#endif
#endif /* !MODULE */
#define initverbose (driver_setup.verbose)
#define bootverbose (np->verbose)
/*===================================================================
**
** Driver setup from the boot command line
**
**===================================================================
*/
#ifdef MODULE
#define ARG_SEP ' '
#else
#define ARG_SEP ','
#endif
#define OPT_TAGS 1
#define OPT_MASTER_PARITY 2
#define OPT_SCSI_PARITY 3
#define OPT_DISCONNECTION 4
#define OPT_SPECIAL_FEATURES 5
#define OPT_UNUSED_1 6
#define OPT_FORCE_SYNC_NEGO 7
#define OPT_REVERSE_PROBE 8
#define OPT_DEFAULT_SYNC 9
#define OPT_VERBOSE 10
#define OPT_DEBUG 11
#define OPT_BURST_MAX 12
#define OPT_LED_PIN 13
#define OPT_MAX_WIDE 14
#define OPT_SETTLE_DELAY 15
#define OPT_DIFF_SUPPORT 16
#define OPT_IRQM 17
#define OPT_PCI_FIX_UP 18
#define OPT_BUS_CHECK 19
#define OPT_OPTIMIZE 20
#define OPT_RECOVERY 21
#define OPT_SAFE_SETUP 22
#define OPT_USE_NVRAM 23
#define OPT_EXCLUDE 24
#define OPT_HOST_ID 25
#ifdef SCSI_NCR_IARB_SUPPORT
#define OPT_IARB 26
#endif
#ifdef MODULE
#define ARG_SEP ' '
#else
#define ARG_SEP ','
#endif
#ifndef MODULE
static char setup_token[] __initdata =
"tags:" "mpar:"
"spar:" "disc:"
"specf:" "ultra:"
"fsn:" "revprob:"
"sync:" "verb:"
"debug:" "burst:"
"led:" "wide:"
"settle:" "diff:"
"irqm:" "pcifix:"
"buschk:" "optim:"
"recovery:"
"safe:" "nvram:"
"excl:" "hostid:"
#ifdef SCSI_NCR_IARB_SUPPORT
"iarb:"
#endif
; /* DONNOT REMOVE THIS ';' */
static int __init get_setup_token(char *p)
{
char *cur = setup_token;
char *pc;
int i = 0;
while (cur != NULL && (pc = strchr(cur, ':')) != NULL) {
++pc;
++i;
if (!strncmp(p, cur, pc - cur))
return i;
cur = pc;
}
return 0;
}
static int __init sym53c8xx__setup(char *str)
{
#ifdef SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT
char *cur = str;
char *pc, *pv;
int i, val, c;
int xi = 0;
while (cur != NULL && (pc = strchr(cur, ':')) != NULL) {
char *pe;
val = 0;
pv = pc;
c = *++pv;
if (c == 'n')
val = 0;
else if (c == 'y')
val = 1;
else
val = (int) simple_strtoul(pv, &pe, 0);
switch (get_setup_token(cur)) {
case OPT_TAGS:
driver_setup.default_tags = val;
if (pe && *pe == '/') {
i = 0;
while (*pe && *pe != ARG_SEP &&
i < sizeof(driver_setup.tag_ctrl)-1) {
driver_setup.tag_ctrl[i++] = *pe++;
}
driver_setup.tag_ctrl[i] = '\0';
}
break;
case OPT_MASTER_PARITY:
driver_setup.master_parity = val;
break;
case OPT_SCSI_PARITY:
driver_setup.scsi_parity = val;
break;
case OPT_DISCONNECTION:
driver_setup.disconnection = val;
break;
case OPT_SPECIAL_FEATURES:
driver_setup.special_features = val;
break;
case OPT_FORCE_SYNC_NEGO:
driver_setup.force_sync_nego = val;
break;
case OPT_REVERSE_PROBE:
driver_setup.reverse_probe = val;
break;
case OPT_DEFAULT_SYNC:
driver_setup.default_sync = val;
break;
case OPT_VERBOSE:
driver_setup.verbose = val;
break;
case OPT_DEBUG:
driver_setup.debug = val;
break;
case OPT_BURST_MAX:
driver_setup.burst_max = val;
break;
case OPT_LED_PIN:
driver_setup.led_pin = val;
break;
case OPT_MAX_WIDE:
driver_setup.max_wide = val? 1:0;
break;
case OPT_SETTLE_DELAY:
driver_setup.settle_delay = val;
break;
case OPT_DIFF_SUPPORT:
driver_setup.diff_support = val;
break;
case OPT_IRQM:
driver_setup.irqm = val;
break;
case OPT_PCI_FIX_UP:
driver_setup.pci_fix_up = val;
break;
case OPT_BUS_CHECK:
driver_setup.bus_check = val;
break;
case OPT_OPTIMIZE:
driver_setup.optimize = val;
break;
case OPT_RECOVERY:
driver_setup.recovery = val;
break;
case OPT_USE_NVRAM:
driver_setup.use_nvram = val;
break;
case OPT_SAFE_SETUP:
memcpy(&driver_setup, &driver_safe_setup,
sizeof(driver_setup));
break;
case OPT_EXCLUDE:
if (xi < SCSI_NCR_MAX_EXCLUDES)
driver_setup.excludes[xi++] = val;
break;
case OPT_HOST_ID:
driver_setup.host_id = val;
break;
#ifdef SCSI_NCR_IARB_SUPPORT
case OPT_IARB:
driver_setup.iarb = val;
break;
#endif
default:
printk("sym53c8xx_setup: unexpected boot option '%.*s' ignored\n", (int)(pc-cur+1), cur);
break;
}
if ((cur = strchr(cur, ARG_SEP)) != NULL)
++cur;
}
#endif /* SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT */
return 1;
}
#endif /* !MODULE */
/*===================================================================
**
** Get device queue depth from boot command line.
**
**===================================================================
*/
#define DEF_DEPTH (driver_setup.default_tags)
#define ALL_TARGETS -2
#define NO_TARGET -1
#define ALL_LUNS -2
#define NO_LUN -1
static int device_queue_depth(int unit, int target, int lun)
{
int c, h, t, u, v;
char *p = driver_setup.tag_ctrl;
char *ep;
h = -1;
t = NO_TARGET;
u = NO_LUN;
while ((c = *p++) != 0) {
v = simple_strtoul(p, &ep, 0);
switch(c) {
case '/':
++h;
t = ALL_TARGETS;
u = ALL_LUNS;
break;
case 't':
if (t != target)
t = (target == v) ? v : NO_TARGET;
u = ALL_LUNS;
break;
case 'u':
if (u != lun)
u = (lun == v) ? v : NO_LUN;
break;
case 'q':
if (h == unit &&
(t == ALL_TARGETS || t == target) &&
(u == ALL_LUNS || u == lun))
return v;
break;
case '-':
t = ALL_TARGETS;
u = ALL_LUNS;
break;
default:
break;
}
p = ep;
}
return DEF_DEPTH;
}
/*==========================================================
**
** The CCB done queue uses an array of CCB virtual
** addresses. Empty entries are flagged using the bogus
** virtual address 0xffffffff.
**
** Since PCI ensures that only aligned DWORDs are accessed
** atomically, 64 bit little-endian architecture requires
** to test the high order DWORD of the entry to determine
** if it is empty or valid.
**
** BTW, I will make things differently as soon as I will
** have a better idea, but this is simple and should work.
**
**==========================================================
*/
#define SCSI_NCR_CCB_DONE_SUPPORT
#ifdef SCSI_NCR_CCB_DONE_SUPPORT
#define MAX_DONE 24
#define CCB_DONE_EMPTY 0xffffffffUL
/* All 32 bit architectures */
#if BITS_PER_LONG == 32
#define CCB_DONE_VALID(cp) (((u_long) cp) != CCB_DONE_EMPTY)
/* All > 32 bit (64 bit) architectures regardless endian-ness */
#else
#define CCB_DONE_VALID(cp) \
((((u_long) cp) & 0xffffffff00000000ul) && \
(((u_long) cp) & 0xfffffffful) != CCB_DONE_EMPTY)
#endif
#endif /* SCSI_NCR_CCB_DONE_SUPPORT */
/*==========================================================
**
** Configuration and Debugging
**
**==========================================================
*/
/*
** SCSI address of this device.
** The boot routines should have set it.
** If not, use this.
*/
#ifndef SCSI_NCR_MYADDR
#define SCSI_NCR_MYADDR (7)
#endif
/*
** The maximum number of tags per logic unit.
** Used only for disk devices that support tags.
*/
#ifndef SCSI_NCR_MAX_TAGS
#define SCSI_NCR_MAX_TAGS (8)
#endif
/*
** TAGS are actually limited to 64 tags/lun.
** We need to deal with power of 2, for alignment constraints.
*/
#if SCSI_NCR_MAX_TAGS > 64
#define MAX_TAGS (64)
#else
#define MAX_TAGS SCSI_NCR_MAX_TAGS
#endif
#define NO_TAG (255)
/*
** Choose appropriate type for tag bitmap.
*/
#if MAX_TAGS > 32
typedef u64 tagmap_t;
#else
typedef u32 tagmap_t;
#endif
/*
** Number of targets supported by the driver.
** n permits target numbers 0..n-1.
** Default is 16, meaning targets #0..#15.
** #7 .. is myself.
*/
#ifdef SCSI_NCR_MAX_TARGET
#define MAX_TARGET (SCSI_NCR_MAX_TARGET)
#else
#define MAX_TARGET (16)
#endif
/*
** Number of logic units supported by the driver.
** n enables logic unit numbers 0..n-1.
** The common SCSI devices require only
** one lun, so take 1 as the default.
*/
#ifdef SCSI_NCR_MAX_LUN
#define MAX_LUN SCSI_NCR_MAX_LUN
#else
#define MAX_LUN (1)
#endif
/*
** Asynchronous pre-scaler (ns). Shall be 40
*/
#ifndef SCSI_NCR_MIN_ASYNC
#define SCSI_NCR_MIN_ASYNC (40)
#endif
/*
** The maximum number of jobs scheduled for starting.
** There should be one slot per target, and one slot
** for each tag of each target in use.
** The calculation below is actually quite silly ...
*/
#ifdef SCSI_NCR_CAN_QUEUE
#define MAX_START (SCSI_NCR_CAN_QUEUE + 4)
#else
#define MAX_START (MAX_TARGET + 7 * MAX_TAGS)
#endif
/*
** We limit the max number of pending IO to 250.
** since we donnot want to allocate more than 1
** PAGE for 'scripth'.
*/
#if MAX_START > 250
#undef MAX_START
#define MAX_START 250
#endif
/*
** The maximum number of segments a transfer is split into.
** We support up to 127 segments for both read and write.
** The data scripts are broken into 2 sub-scripts.
** 80 (MAX_SCATTERL) segments are moved from a sub-script
** in on-chip RAM. This makes data transfers shorter than
** 80k (assuming 1k fs) as fast as possible.
*/
#define MAX_SCATTER (SCSI_NCR_MAX_SCATTER)
#if (MAX_SCATTER > 80)
#define MAX_SCATTERL 80
#define MAX_SCATTERH (MAX_SCATTER - MAX_SCATTERL)
#else
#define MAX_SCATTERL (MAX_SCATTER-1)
#define MAX_SCATTERH 1
#endif
/*
** other
*/
#define NCR_SNOOP_TIMEOUT (1000000)
/*
** Other definitions
*/
#define ScsiResult(host_code, scsi_code) (((host_code) << 16) + ((scsi_code) & 0x7f))
#define initverbose (driver_setup.verbose)
#define bootverbose (np->verbose)
/*==========================================================
**
** Command control block states.
**
**==========================================================
*/
#define HS_IDLE (0)
#define HS_BUSY (1)
#define HS_NEGOTIATE (2) /* sync/wide data transfer*/
#define HS_DISCONNECT (3) /* Disconnected by target */
#define HS_DONEMASK (0x80)
#define HS_COMPLETE (4|HS_DONEMASK)
#define HS_SEL_TIMEOUT (5|HS_DONEMASK) /* Selection timeout */
#define HS_RESET (6|HS_DONEMASK) /* SCSI reset */
#define HS_ABORTED (7|HS_DONEMASK) /* Transfer aborted */
#define HS_TIMEOUT (8|HS_DONEMASK) /* Software timeout */
#define HS_FAIL (9|HS_DONEMASK) /* SCSI or PCI bus errors */
#define HS_UNEXPECTED (10|HS_DONEMASK)/* Unexpected disconnect */
/*
** Invalid host status values used by the SCRIPTS processor
** when the nexus is not fully identified.
** Shall never appear in a CCB.
*/
#define HS_INVALMASK (0x40)
#define HS_SELECTING (0|HS_INVALMASK)
#define HS_IN_RESELECT (1|HS_INVALMASK)
#define HS_STARTING (2|HS_INVALMASK)
/*
** Flags set by the SCRIPT processor for commands
** that have been skipped.
*/
#define HS_SKIPMASK (0x20)
/*==========================================================
**
** Software Interrupt Codes
**
**==========================================================
*/
#define SIR_BAD_STATUS (1)
#define SIR_XXXXXXXXXX (2)
#define SIR_NEGO_SYNC (3)
#define SIR_NEGO_WIDE (4)
#define SIR_NEGO_FAILED (5)
#define SIR_NEGO_PROTO (6)
#define SIR_REJECT_RECEIVED (7)
#define SIR_REJECT_SENT (8)
#define SIR_IGN_RESIDUE (9)
#define SIR_MISSING_SAVE (10)
#define SIR_RESEL_NO_MSG_IN (11)
#define SIR_RESEL_NO_IDENTIFY (12)
#define SIR_RESEL_BAD_LUN (13)
#define SIR_RESEL_BAD_TARGET (14)
#define SIR_RESEL_BAD_I_T_L (15)
#define SIR_RESEL_BAD_I_T_L_Q (16)
#define SIR_DONE_OVERFLOW (17)
#define SIR_INTFLY (18)
#define SIR_MAX (18)
/*==========================================================
**
** Extended error codes.
** xerr_status field of struct ccb.
**
**==========================================================
*/
#define XE_OK (0)
#define XE_EXTRA_DATA (1) /* unexpected data phase */
#define XE_BAD_PHASE (2) /* illegal phase (4/5) */
/*==========================================================
**
** Negotiation status.
** nego_status field of struct ccb.
**
**==========================================================
*/
#define NS_NOCHANGE (0)
#define NS_SYNC (1)
#define NS_WIDE (2)
#define NS_PPR (4)
/*==========================================================
**
** Misc.
**
**==========================================================
*/
#define CCB_MAGIC (0xf2691ad2)
/*==========================================================
**
** Declaration of structs.
**
**==========================================================
*/
static struct scsi_transport_template *ncr53c8xx_transport_template = NULL;
struct tcb;
struct lcb;
struct ccb;
struct ncb;
struct script;
struct link {
ncrcmd l_cmd;
ncrcmd l_paddr;
};
struct usrcmd {
u_long target;
u_long lun;
u_long data;
u_long cmd;
};
#define UC_SETSYNC 10
#define UC_SETTAGS 11
#define UC_SETDEBUG 12
#define UC_SETORDER 13
#define UC_SETWIDE 14
#define UC_SETFLAG 15
#define UC_SETVERBOSE 17
#define UF_TRACE (0x01)
#define UF_NODISC (0x02)
#define UF_NOSCAN (0x04)
/*========================================================================
**
** Declaration of structs: target control block
**
**========================================================================
*/
struct tcb {
/*----------------------------------------------------------------
** During reselection the ncr jumps to this point with SFBR
** set to the encoded target number with bit 7 set.
** if it's not this target, jump to the next.
**
** JUMP IF (SFBR != #target#), @(next tcb)
**----------------------------------------------------------------
*/
struct link jump_tcb;
/*----------------------------------------------------------------
** Load the actual values for the sxfer and the scntl3
** register (sync/wide mode).
**
** SCR_COPY (1), @(sval field of this tcb), @(sxfer register)
** SCR_COPY (1), @(wval field of this tcb), @(scntl3 register)
**----------------------------------------------------------------
*/
ncrcmd getscr[6];
/*----------------------------------------------------------------
** Get the IDENTIFY message and load the LUN to SFBR.
**
** CALL, <RESEL_LUN>
**----------------------------------------------------------------
*/
struct link call_lun;
/*----------------------------------------------------------------
** Now look for the right lun.
**
** For i = 0 to 3
** SCR_JUMP ^ IFTRUE(MASK(i, 3)), @(first lcb mod. i)
**
** Recent chips will prefetch the 4 JUMPS using only 1 burst.
** It is kind of hashcoding.
**----------------------------------------------------------------
*/
struct link jump_lcb[4]; /* JUMPs for reselection */
struct lcb * lp[MAX_LUN]; /* The lcb's of this tcb */
/*----------------------------------------------------------------
** Pointer to the ccb used for negotiation.
** Prevent from starting a negotiation for all queued commands
** when tagged command queuing is enabled.
**----------------------------------------------------------------
*/
struct ccb * nego_cp;
/*----------------------------------------------------------------
** statistical data
**----------------------------------------------------------------
*/
u_long transfers;
u_long bytes;
/*----------------------------------------------------------------
** negotiation of wide and synch transfer and device quirks.
**----------------------------------------------------------------
*/
#ifdef SCSI_NCR_BIG_ENDIAN
/*0*/ u16 period;
/*2*/ u_char sval;
/*3*/ u_char minsync;
/*0*/ u_char wval;
/*1*/ u_char widedone;
/*2*/ u_char quirks;
/*3*/ u_char maxoffs;
#else
/*0*/ u_char minsync;
/*1*/ u_char sval;
/*2*/ u16 period;
/*0*/ u_char maxoffs;
/*1*/ u_char quirks;
/*2*/ u_char widedone;
/*3*/ u_char wval;
#endif
/* User settable limits and options. */
u_char usrsync;
u_char usrwide;
u_char usrtags;
u_char usrflag;
struct scsi_target *starget;
};
/*========================================================================
**
** Declaration of structs: lun control block
**
**========================================================================
*/
struct lcb {
/*----------------------------------------------------------------
** During reselection the ncr jumps to this point
** with SFBR set to the "Identify" message.
** if it's not this lun, jump to the next.
**
** JUMP IF (SFBR != #lun#), @(next lcb of this target)
**
** It is this lun. Load TEMP with the nexus jumps table
** address and jump to RESEL_TAG (or RESEL_NOTAG).
**
** SCR_COPY (4), p_jump_ccb, TEMP,
** SCR_JUMP, <RESEL_TAG>
**----------------------------------------------------------------
*/
struct link jump_lcb;
ncrcmd load_jump_ccb[3];
struct link jump_tag;
ncrcmd p_jump_ccb; /* Jump table bus address */
/*----------------------------------------------------------------
** Jump table used by the script processor to directly jump
** to the CCB corresponding to the reselected nexus.
** Address is allocated on 256 bytes boundary in order to
** allow 8 bit calculation of the tag jump entry for up to
** 64 possible tags.
**----------------------------------------------------------------
*/
u32 jump_ccb_0; /* Default table if no tags */
u32 *jump_ccb; /* Virtual address */
/*----------------------------------------------------------------
** CCB queue management.
**----------------------------------------------------------------
*/
struct list_head free_ccbq; /* Queue of available CCBs */
struct list_head busy_ccbq; /* Queue of busy CCBs */
struct list_head wait_ccbq; /* Queue of waiting for IO CCBs */
struct list_head skip_ccbq; /* Queue of skipped CCBs */
u_char actccbs; /* Number of allocated CCBs */
u_char busyccbs; /* CCBs busy for this lun */
u_char queuedccbs; /* CCBs queued to the controller*/
u_char queuedepth; /* Queue depth for this lun */
u_char scdev_depth; /* SCSI device queue depth */
u_char maxnxs; /* Max possible nexuses */
/*----------------------------------------------------------------
** Control of tagged command queuing.
** Tags allocation is performed using a circular buffer.
** This avoids using a loop for tag allocation.
**----------------------------------------------------------------
*/
u_char ia_tag; /* Allocation index */
u_char if_tag; /* Freeing index */
u_char cb_tags[MAX_TAGS]; /* Circular tags buffer */
u_char usetags; /* Command queuing is active */
u_char maxtags; /* Max nr of tags asked by user */
u_char numtags; /* Current number of tags */
/*----------------------------------------------------------------
** QUEUE FULL control and ORDERED tag control.
**----------------------------------------------------------------
*/
/*----------------------------------------------------------------
** QUEUE FULL and ORDERED tag control.
**----------------------------------------------------------------
*/
u16 num_good; /* Nr of GOOD since QUEUE FULL */
tagmap_t tags_umap; /* Used tags bitmap */
tagmap_t tags_smap; /* Tags in use at 'tag_stime' */
u_long tags_stime; /* Last time we set smap=umap */
struct ccb * held_ccb; /* CCB held for QUEUE FULL */
};
/*========================================================================
**
** Declaration of structs: the launch script.
**
**========================================================================
**
** It is part of the CCB and is called by the scripts processor to
** start or restart the data structure (nexus).
** This 6 DWORDs mini script makes use of prefetching.
**
**------------------------------------------------------------------------
*/
struct launch {
/*----------------------------------------------------------------
** SCR_COPY(4), @(p_phys), @(dsa register)
** SCR_JUMP, @(scheduler_point)
**----------------------------------------------------------------
*/
ncrcmd setup_dsa[3]; /* Copy 'phys' address to dsa */
struct link schedule; /* Jump to scheduler point */
ncrcmd p_phys; /* 'phys' header bus address */
};
/*========================================================================
**
** Declaration of structs: global HEADER.
**
**========================================================================
**
** This substructure is copied from the ccb to a global address after
** selection (or reselection) and copied back before disconnect.
**
** These fields are accessible to the script processor.
**
**------------------------------------------------------------------------
*/
struct head {
/*----------------------------------------------------------------
** Saved data pointer.
** Points to the position in the script responsible for the
** actual transfer transfer of data.
** It's written after reception of a SAVE_DATA_POINTER message.
** The goalpointer points after the last transfer command.
**----------------------------------------------------------------
*/
u32 savep;
u32 lastp;
u32 goalp;
/*----------------------------------------------------------------
** Alternate data pointer.
** They are copied back to savep/lastp/goalp by the SCRIPTS
** when the direction is unknown and the device claims data out.
**----------------------------------------------------------------
*/
u32 wlastp;
u32 wgoalp;
/*----------------------------------------------------------------
** The virtual address of the ccb containing this header.
**----------------------------------------------------------------
*/
struct ccb * cp;
/*----------------------------------------------------------------
** Status fields.
**----------------------------------------------------------------
*/
u_char scr_st[4]; /* script status */
u_char status[4]; /* host status. must be the */
/* last DWORD of the header. */
};
/*
** The status bytes are used by the host and the script processor.
**
** The byte corresponding to the host_status must be stored in the
** last DWORD of the CCB header since it is used for command
** completion (ncr_wakeup()). Doing so, we are sure that the header
** has been entirely copied back to the CCB when the host_status is
** seen complete by the CPU.
**
** The last four bytes (status[4]) are copied to the scratchb register
** (declared as scr0..scr3 in ncr_reg.h) just after the select/reselect,
** and copied back just after disconnecting.
** Inside the script the XX_REG are used.
**
** The first four bytes (scr_st[4]) are used inside the script by
** "COPY" commands.
** Because source and destination must have the same alignment
** in a DWORD, the fields HAVE to be at the chosen offsets.
** xerr_st 0 (0x34) scratcha
** sync_st 1 (0x05) sxfer
** wide_st 3 (0x03) scntl3
*/
/*
** Last four bytes (script)
*/
#define QU_REG scr0
#define HS_REG scr1
#define HS_PRT nc_scr1
#define SS_REG scr2
#define SS_PRT nc_scr2
#define PS_REG scr3
/*
** Last four bytes (host)
*/
#ifdef SCSI_NCR_BIG_ENDIAN
#define actualquirks phys.header.status[3]
#define host_status phys.header.status[2]
#define scsi_status phys.header.status[1]
#define parity_status phys.header.status[0]
#else
#define actualquirks phys.header.status[0]
#define host_status phys.header.status[1]
#define scsi_status phys.header.status[2]
#define parity_status phys.header.status[3]
#endif
/*
** First four bytes (script)
*/
#define xerr_st header.scr_st[0]
#define sync_st header.scr_st[1]
#define nego_st header.scr_st[2]
#define wide_st header.scr_st[3]
/*
** First four bytes (host)
*/
#define xerr_status phys.xerr_st
#define nego_status phys.nego_st
#if 0
#define sync_status phys.sync_st
#define wide_status phys.wide_st
#endif
/*==========================================================
**
** Declaration of structs: Data structure block
**
**==========================================================
**
** During execution of a ccb by the script processor,
** the DSA (data structure address) register points
** to this substructure of the ccb.
** This substructure contains the header with
** the script-processor-changeable data and
** data blocks for the indirect move commands.
**
**----------------------------------------------------------
*/
struct dsb {
/*
** Header.
*/
struct head header;
/*
** Table data for Script
*/
struct scr_tblsel select;
struct scr_tblmove smsg ;
struct scr_tblmove cmd ;
struct scr_tblmove sense ;
struct scr_tblmove data[MAX_SCATTER];
};
/*========================================================================
**
** Declaration of structs: Command control block.
**
**========================================================================
*/
struct ccb {
/*----------------------------------------------------------------
** This is the data structure which is pointed by the DSA
** register when it is executed by the script processor.
** It must be the first entry because it contains the header
** as first entry that must be cache line aligned.
**----------------------------------------------------------------
*/
struct dsb phys;
/*----------------------------------------------------------------
** Mini-script used at CCB execution start-up.
** Load the DSA with the data structure address (phys) and
** jump to SELECT. Jump to CANCEL if CCB is to be canceled.
**----------------------------------------------------------------
*/
struct launch start;
/*----------------------------------------------------------------
** Mini-script used at CCB relection to restart the nexus.
** Load the DSA with the data structure address (phys) and
** jump to RESEL_DSA. Jump to ABORT if CCB is to be aborted.
**----------------------------------------------------------------
*/
struct launch restart;
/*----------------------------------------------------------------
** If a data transfer phase is terminated too early
** (after reception of a message (i.e. DISCONNECT)),
** we have to prepare a mini script to transfer
** the rest of the data.
**----------------------------------------------------------------
*/
ncrcmd patch[8];
/*----------------------------------------------------------------
** The general SCSI driver provides a
** pointer to a control block.
**----------------------------------------------------------------
*/
struct scsi_cmnd *cmd; /* SCSI command */
u_char cdb_buf[16]; /* Copy of CDB */
u_char sense_buf[64];
int data_len; /* Total data length */
/*----------------------------------------------------------------
** Message areas.
** We prepare a message to be sent after selection.
** We may use a second one if the command is rescheduled
** due to GETCC or QFULL.
** Contents are IDENTIFY and SIMPLE_TAG.
** While negotiating sync or wide transfer,
** a SDTR or WDTR message is appended.
**----------------------------------------------------------------
*/
u_char scsi_smsg [8];
u_char scsi_smsg2[8];
/*----------------------------------------------------------------
** Other fields.
**----------------------------------------------------------------
*/
u_long p_ccb; /* BUS address of this CCB */
u_char sensecmd[6]; /* Sense command */
u_char tag; /* Tag for this transfer */
/* 255 means no tag */
u_char target;
u_char lun;
u_char queued;
u_char auto_sense;
struct ccb * link_ccb; /* Host adapter CCB chain */
struct list_head link_ccbq; /* Link to unit CCB queue */
u32 startp; /* Initial data pointer */
u_long magic; /* Free / busy CCB flag */
};
#define CCB_PHYS(cp,lbl) (cp->p_ccb + offsetof(struct ccb, lbl))
/*========================================================================
**
** Declaration of structs: NCR device descriptor
**
**========================================================================
*/
struct ncb {
/*----------------------------------------------------------------
** The global header.
** It is accessible to both the host and the script processor.
** Must be cache line size aligned (32 for x86) in order to
** allow cache line bursting when it is copied to/from CCB.
**----------------------------------------------------------------
*/
struct head header;
/*----------------------------------------------------------------
** CCBs management queues.
**----------------------------------------------------------------
*/
struct scsi_cmnd *waiting_list; /* Commands waiting for a CCB */
/* when lcb is not allocated. */
struct scsi_cmnd *done_list; /* Commands waiting for done() */
/* callback to be invoked. */
spinlock_t smp_lock; /* Lock for SMP threading */
/*----------------------------------------------------------------
** Chip and controller indentification.
**----------------------------------------------------------------
*/
int unit; /* Unit number */
char inst_name[16]; /* ncb instance name */
/*----------------------------------------------------------------
** Initial value of some IO register bits.
** These values are assumed to have been set by BIOS, and may
** be used for probing adapter implementation differences.
**----------------------------------------------------------------
*/
u_char sv_scntl0, sv_scntl3, sv_dmode, sv_dcntl, sv_ctest0, sv_ctest3,
sv_ctest4, sv_ctest5, sv_gpcntl, sv_stest2, sv_stest4;
/*----------------------------------------------------------------
** Actual initial value of IO register bits used by the
** driver. They are loaded at initialisation according to
** features that are to be enabled.
**----------------------------------------------------------------
*/
u_char rv_scntl0, rv_scntl3, rv_dmode, rv_dcntl, rv_ctest0, rv_ctest3,
rv_ctest4, rv_ctest5, rv_stest2;
/*----------------------------------------------------------------
** Targets management.
** During reselection the ncr jumps to jump_tcb.
** The SFBR register is loaded with the encoded target id.
** For i = 0 to 3
** SCR_JUMP ^ IFTRUE(MASK(i, 3)), @(next tcb mod. i)
**
** Recent chips will prefetch the 4 JUMPS using only 1 burst.
** It is kind of hashcoding.
**----------------------------------------------------------------
*/
struct link jump_tcb[4]; /* JUMPs for reselection */
struct tcb target[MAX_TARGET]; /* Target data */
/*----------------------------------------------------------------
** Virtual and physical bus addresses of the chip.
**----------------------------------------------------------------
*/
void __iomem *vaddr; /* Virtual and bus address of */
unsigned long paddr; /* chip's IO registers. */
unsigned long paddr2; /* On-chip RAM bus address. */
volatile /* Pointer to volatile for */
struct ncr_reg __iomem *reg; /* memory mapped IO. */
/*----------------------------------------------------------------
** SCRIPTS virtual and physical bus addresses.
** 'script' is loaded in the on-chip RAM if present.
** 'scripth' stays in main memory.
**----------------------------------------------------------------
*/
struct script *script0; /* Copies of script and scripth */
struct scripth *scripth0; /* relocated for this ncb. */
struct scripth *scripth; /* Actual scripth virt. address */
u_long p_script; /* Actual script and scripth */
u_long p_scripth; /* bus addresses. */
/*----------------------------------------------------------------
** General controller parameters and configuration.
**----------------------------------------------------------------
*/
struct device *dev;
u_char revision_id; /* PCI device revision id */
u32 irq; /* IRQ level */
u32 features; /* Chip features map */
u_char myaddr; /* SCSI id of the adapter */
u_char maxburst; /* log base 2 of dwords burst */
u_char maxwide; /* Maximum transfer width */
u_char minsync; /* Minimum sync period factor */
u_char maxsync; /* Maximum sync period factor */
u_char maxoffs; /* Max scsi offset */
u_char multiplier; /* Clock multiplier (1,2,4) */
u_char clock_divn; /* Number of clock divisors */
u_long clock_khz; /* SCSI clock frequency in KHz */
/*----------------------------------------------------------------
** Start queue management.
** It is filled up by the host processor and accessed by the
** SCRIPTS processor in order to start SCSI commands.
**----------------------------------------------------------------
*/
u16 squeueput; /* Next free slot of the queue */
u16 actccbs; /* Number of allocated CCBs */
u16 queuedccbs; /* Number of CCBs in start queue*/
u16 queuedepth; /* Start queue depth */
/*----------------------------------------------------------------
** Timeout handler.
**----------------------------------------------------------------
*/
struct timer_list timer; /* Timer handler link header */
u_long lasttime;
u_long settle_time; /* Resetting the SCSI BUS */
/*----------------------------------------------------------------
** Debugging and profiling.
**----------------------------------------------------------------
*/
struct ncr_reg regdump; /* Register dump */
u_long regtime; /* Time it has been done */
/*----------------------------------------------------------------
** Miscellaneous buffers accessed by the scripts-processor.
** They shall be DWORD aligned, because they may be read or
** written with a SCR_COPY script command.
**----------------------------------------------------------------
*/
u_char msgout[8]; /* Buffer for MESSAGE OUT */
u_char msgin [8]; /* Buffer for MESSAGE IN */
u32 lastmsg; /* Last SCSI message sent */
u_char scratch; /* Scratch for SCSI receive */
/*----------------------------------------------------------------
** Miscellaneous configuration and status parameters.
**----------------------------------------------------------------
*/
u_char disc; /* Diconnection allowed */
u_char scsi_mode; /* Current SCSI BUS mode */
u_char order; /* Tag order to use */
u_char verbose; /* Verbosity for this controller*/
int ncr_cache; /* Used for cache test at init. */
u_long p_ncb; /* BUS address of this NCB */
/*----------------------------------------------------------------
** Command completion handling.
**----------------------------------------------------------------
*/
#ifdef SCSI_NCR_CCB_DONE_SUPPORT
struct ccb *(ccb_done[MAX_DONE]);
int ccb_done_ic;
#endif
/*----------------------------------------------------------------
** Fields that should be removed or changed.
**----------------------------------------------------------------
*/
struct ccb *ccb; /* Global CCB */
struct usrcmd user; /* Command from user */
volatile u_char release_stage; /* Synchronisation stage on release */
};
#define NCB_SCRIPT_PHYS(np,lbl) (np->p_script + offsetof (struct script, lbl))
#define NCB_SCRIPTH_PHYS(np,lbl) (np->p_scripth + offsetof (struct scripth,lbl))
/*==========================================================
**
**
** Script for NCR-Processor.
**
** Use ncr_script_fill() to create the variable parts.
** Use ncr_script_copy_and_bind() to make a copy and
** bind to physical addresses.
**
**
**==========================================================
**
** We have to know the offsets of all labels before
** we reach them (for forward jumps).
** Therefore we declare a struct here.
** If you make changes inside the script,
** DONT FORGET TO CHANGE THE LENGTHS HERE!
**
**----------------------------------------------------------
*/
/*
** For HP Zalon/53c720 systems, the Zalon interface
** between CPU and 53c720 does prefetches, which causes
** problems with self modifying scripts. The problem
** is overcome by calling a dummy subroutine after each
** modification, to force a refetch of the script on
** return from the subroutine.
*/
#ifdef CONFIG_NCR53C8XX_PREFETCH
#define PREFETCH_FLUSH_CNT 2
#define PREFETCH_FLUSH SCR_CALL, PADDRH (wait_dma),
#else
#define PREFETCH_FLUSH_CNT 0
#define PREFETCH_FLUSH
#endif
/*
** Script fragments which are loaded into the on-chip RAM
** of 825A, 875 and 895 chips.
*/
struct script {
ncrcmd start [ 5];
ncrcmd startpos [ 1];
ncrcmd select [ 6];
ncrcmd select2 [ 9 + PREFETCH_FLUSH_CNT];
ncrcmd loadpos [ 4];
ncrcmd send_ident [ 9];
ncrcmd prepare [ 6];
ncrcmd prepare2 [ 7];
ncrcmd command [ 6];
ncrcmd dispatch [ 32];
ncrcmd clrack [ 4];
ncrcmd no_data [ 17];
ncrcmd status [ 8];
ncrcmd msg_in [ 2];
ncrcmd msg_in2 [ 16];
ncrcmd msg_bad [ 4];
ncrcmd setmsg [ 7];
ncrcmd cleanup [ 6];
ncrcmd complete [ 9];
ncrcmd cleanup_ok [ 8 + PREFETCH_FLUSH_CNT];
ncrcmd cleanup0 [ 1];
#ifndef SCSI_NCR_CCB_DONE_SUPPORT
ncrcmd signal [ 12];
#else
ncrcmd signal [ 9];
ncrcmd done_pos [ 1];
ncrcmd done_plug [ 2];
ncrcmd done_end [ 7];
#endif
ncrcmd save_dp [ 7];
ncrcmd restore_dp [ 5];