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/*
* Disk Array driver for Compaq SMART2 Controllers
* Copyright 1998 Compaq Computer Corporation
*
* 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, GOOD TITLE or
* NON INFRINGEMENT. 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.
*
* Questions/Comments/Bugfixes to arrays@compaq.com
*
* If you want to make changes, improve or add functionality to this
* driver, you'll probably need the Compaq Array Controller Interface
* Specificiation (Document number ECG086/1198)
*/
/*
* This file contains the controller communication implementation for
* Compaq SMART-1 and SMART-2 controllers. To the best of my knowledge,
* this should support:
*
* PCI:
* SMART-2/P, SMART-2DH, SMART-2SL, SMART-221, SMART-3100ES, SMART-3200
* Integerated SMART Array Controller, SMART-4200, SMART-4250ES
*
* EISA:
* SMART-2/E, SMART, IAES, IDA-2, IDA
*/
/*
* Memory mapped FIFO interface (SMART 42xx cards)
*/
static void smart4_submit_command(ctlr_info_t *h, cmdlist_t *c)
{
writel(c->busaddr, h->vaddr + S42XX_REQUEST_PORT_OFFSET);
}
/*
* This card is the opposite of the other cards.
* 0 turns interrupts on...
* 0x08 turns them off...
*/
static void smart4_intr_mask(ctlr_info_t *h, unsigned long val)
{
if (val)
{ /* Turn interrupts on */
writel(0, h->vaddr + S42XX_REPLY_INTR_MASK_OFFSET);
} else /* Turn them off */
{
writel( S42XX_INTR_OFF,
h->vaddr + S42XX_REPLY_INTR_MASK_OFFSET);
}
}
/*
* For older cards FIFO Full = 0.
* On this card 0 means there is room, anything else FIFO Full.
*
*/
static unsigned long smart4_fifo_full(ctlr_info_t *h)
{
return (!readl(h->vaddr + S42XX_REQUEST_PORT_OFFSET));
}
/* This type of controller returns -1 if the fifo is empty,
* Not 0 like the others.
* And we need to let it know we read a value out
*/
static unsigned long smart4_completed(ctlr_info_t *h)
{
long register_value
= readl(h->vaddr + S42XX_REPLY_PORT_OFFSET);
/* Fifo is empty */
if( register_value == 0xffffffff)
return 0;
/* Need to let it know we got the reply */
/* We do this by writing a 0 to the port we just read from */
writel(0, h->vaddr + S42XX_REPLY_PORT_OFFSET);
return ((unsigned long) register_value);
}
/*
* This hardware returns interrupt pending at a different place and
* it does not tell us if the fifo is empty, we will have check
* that by getting a 0 back from the comamnd_completed call.
*/
static unsigned long smart4_intr_pending(ctlr_info_t *h)
{
unsigned long register_value =
readl(h->vaddr + S42XX_INTR_STATUS);
if( register_value & S42XX_INTR_PENDING)
return FIFO_NOT_EMPTY;
return 0 ;
}
static struct access_method smart4_access = {
smart4_submit_command,
smart4_intr_mask,
smart4_fifo_full,
smart4_intr_pending,
smart4_completed,
};
/*
* Memory mapped FIFO interface (PCI SMART2 and SMART 3xxx cards)
*/
static void smart2_submit_command(ctlr_info_t *h, cmdlist_t *c)
{
writel(c->busaddr, h->vaddr + COMMAND_FIFO);
}
static void smart2_intr_mask(ctlr_info_t *h, unsigned long val)
{
writel(val, h->vaddr + INTR_MASK);
}
static unsigned long smart2_fifo_full(ctlr_info_t *h)
{
return readl(h->vaddr + COMMAND_FIFO);
}
static unsigned long smart2_completed(ctlr_info_t *h)
{
return readl(h->vaddr + COMMAND_COMPLETE_FIFO);
}
static unsigned long smart2_intr_pending(ctlr_info_t *h)
{
return readl(h->vaddr + INTR_PENDING);
}
static struct access_method smart2_access = {
smart2_submit_command,
smart2_intr_mask,
smart2_fifo_full,
smart2_intr_pending,
smart2_completed,
};
/*
* IO access for SMART-2/E cards
*/
static void smart2e_submit_command(ctlr_info_t *h, cmdlist_t *c)
{
outl(c->busaddr, h->ioaddr + COMMAND_FIFO);
}
static void smart2e_intr_mask(ctlr_info_t *h, unsigned long val)
{
outl(val, h->ioaddr + INTR_MASK);
}
static unsigned long smart2e_fifo_full(ctlr_info_t *h)
{
return inl(h->ioaddr + COMMAND_FIFO);
}
static unsigned long smart2e_completed(ctlr_info_t *h)
{
return inl(h->ioaddr + COMMAND_COMPLETE_FIFO);
}
static unsigned long smart2e_intr_pending(ctlr_info_t *h)
{
return inl(h->ioaddr + INTR_PENDING);
}
static struct access_method smart2e_access = {
smart2e_submit_command,
smart2e_intr_mask,
smart2e_fifo_full,
smart2e_intr_pending,
smart2e_completed,
};
/*
* IO access for older SMART-1 type cards
*/
#define SMART1_SYSTEM_MASK 0xC8E
#define SMART1_SYSTEM_DOORBELL 0xC8F
#define SMART1_LOCAL_MASK 0xC8C
#define SMART1_LOCAL_DOORBELL 0xC8D
#define SMART1_INTR_MASK 0xC89
#define SMART1_LISTADDR 0xC90
#define SMART1_LISTLEN 0xC94
#define SMART1_TAG 0xC97
#define SMART1_COMPLETE_ADDR 0xC98
#define SMART1_LISTSTATUS 0xC9E
#define CHANNEL_BUSY 0x01
#define CHANNEL_CLEAR 0x02
static void smart1_submit_command(ctlr_info_t *h, cmdlist_t *c)
{
/*
* This __u16 is actually a bunch of control flags on SMART
* and below. We want them all to be zero.
*/
c->hdr.size = 0;
outb(CHANNEL_CLEAR, h->ioaddr + SMART1_SYSTEM_DOORBELL);
outl(c->busaddr, h->ioaddr + SMART1_LISTADDR);
outw(c->size, h->ioaddr + SMART1_LISTLEN);
outb(CHANNEL_BUSY, h->ioaddr + SMART1_LOCAL_DOORBELL);
}
static void smart1_intr_mask(ctlr_info_t *h, unsigned long val)
{
if (val == 1) {
outb(0xFD, h->ioaddr + SMART1_SYSTEM_DOORBELL);
outb(CHANNEL_BUSY, h->ioaddr + SMART1_LOCAL_DOORBELL);
outb(0x01, h->ioaddr + SMART1_INTR_MASK);
outb(0x01, h->ioaddr + SMART1_SYSTEM_MASK);
} else {
outb(0, h->ioaddr + 0xC8E);
}
}
static unsigned long smart1_fifo_full(ctlr_info_t *h)
{
unsigned char chan;
chan = inb(h->ioaddr + SMART1_SYSTEM_DOORBELL) & CHANNEL_CLEAR;
return chan;
}
static unsigned long smart1_completed(ctlr_info_t *h)
{
unsigned char status;
unsigned long cmd;
if (inb(h->ioaddr + SMART1_SYSTEM_DOORBELL) & CHANNEL_BUSY) {
outb(CHANNEL_BUSY, h->ioaddr + SMART1_SYSTEM_DOORBELL);
cmd = inl(h->ioaddr + SMART1_COMPLETE_ADDR);
status = inb(h->ioaddr + SMART1_LISTSTATUS);
outb(CHANNEL_CLEAR, h->ioaddr + SMART1_LOCAL_DOORBELL);
if (cmd) ((cmdlist_t*)bus_to_virt(cmd))->req.hdr.rcode = status;
} else {
cmd = 0;
}
return cmd;
}
static unsigned long smart1_intr_pending(ctlr_info_t *h)
{
unsigned char chan;
chan = inb(h->ioaddr + SMART1_SYSTEM_DOORBELL) & CHANNEL_BUSY;
return chan;
}
static struct access_method smart1_access = {
smart1_submit_command,
smart1_intr_mask,
smart1_fifo_full,
smart1_intr_pending,
smart1_completed,
};
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