[PATCH] sym53c500_cs PCMCIA SCSI driver (round 5)

Fifth attempt at a PCMCIA SCSI driver for the Symbios 53c500
controller.  This version has all the cleanup Christoph has requested
to date, including removal of support for the obsolete (in 2.6)
proc_info functionality.

Support for additional sysfs class device attributes has been added:
two are read-only (irq, ioport), one is read-write (fast_pio).  The
read-write attribute is a per-instance flag indicating the PIO speed
of the particular HBA: valid values are 1 (enabled -- default) and 0
(disabled).

Documentation/scsi/00-INDEX

@@ -62,6 +62,8 @@ scsi_mid_low_api.txt
 	- info on API between SCSI layer and low level drivers
 st.txt
 	- info on scsi tape driver
+sym53c500_cs.txt
+	- info on PCMCIA driver for Symbios Logic 53c500 based adapters
 sym53c8xx_2.txt
 	- info on second generation driver for sym53c8xx based adapters
 tmscsim.txt

Documentation/scsi/sym53c500_cs.txt

+The sym53c500_cs driver originated as an add-on to David Hinds' pcmcia-cs
+package, and was written by Tom Corner (tcorner@via.at).  A rewrite was
+long overdue, and the current version addresses the following concerns:
+
+	(1) extensive kernel changes between 2.4 and 2.6.
+	(2) deprecated PCMCIA support outside the kernel.
+
+All the USE_BIOS code has been ripped out.  It was never used, and could
+not have worked anyway.  The USE_DMA code is likewise gone.  Many thanks
+to YOKOTA Hiroshi (nsp_cs driver) and David Hinds (qlogic_cs driver) for
+the code fragments I shamelessly adapted for this work.  Thanks also to
+Christoph Hellwig for his patient tutelage while I stumbled about.
+
+The Symbios Logic 53c500 chip was used in the "newer" (circa 1997) version
+of the New Media Bus Toaster PCMCIA SCSI controller.  Presumably there are
+other products using this chip, but I've never laid eyes (much less hands)
+on one.
+
+Through the years, there have been a number of downloads of the pcmcia-cs
+version of this driver, and I guess it worked for those users.  It worked
+for Tom Corner, and it works for me.  Your mileage will probably vary.
+
+--Bob Tracy (rct@frus.com)

drivers/scsi/pcmcia/Kconfig

@@ -69,4 +69,14 @@ config PCMCIA_QLOGIC
 	  To compile this driver as a module, choose M here: the
 	  module will be called qlogic_cs.
 
+config PCMCIA_SYM53C500
+	tristate "Symbios 53c500 PCMCIA support"
+	depends on m
+	help
+	  Say Y here if you have a New Media Bus Toaster or other PCMCIA
+	  SCSI adapter based on the Symbios 53c500 controller.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called sym53c500_cs.
+
 endmenu

drivers/scsi/pcmcia/Makefile

@@ -6,6 +6,7 @@ obj-$(CONFIG_PCMCIA_QLOGIC)	+= qlogic_cs.o
 obj-$(CONFIG_PCMCIA_FDOMAIN)	+= fdomain_cs.o
 obj-$(CONFIG_PCMCIA_AHA152X)	+= aha152x_cs.o
 obj-$(CONFIG_PCMCIA_NINJA_SCSI)	+= nsp_cs.o
+obj-$(CONFIG_PCMCIA_SYM53C500)	+= sym53c500_cs.o
 
 aha152x_cs-objs	:= aha152x_stub.o aha152x_core.o
 fdomain_cs-objs	:= fdomain_stub.o fdomain_core.o

drivers/scsi/pcmcia/sym53c500_cs.c

+/*
+*  sym53c500_cs.c	Bob Tracy (rct@frus.com)
+*
+*  A rewrite of the pcmcia-cs add-on driver for newer (circa 1997)
+*  New Media Bus Toaster PCMCIA SCSI cards using the Symbios Logic
+*  53c500 controller: intended for use with 2.6 and later kernels.
+*  The pcmcia-cs add-on version of this driver is not supported
+*  beyond 2.4.  It consisted of three files with history/copyright
+*  information as follows:
+*
+*  SYM53C500.h
+*	Bob Tracy (rct@frus.com)
+*	Original by Tom Corner (tcorner@via.at).
+*	Adapted from NCR53c406a.h which is Copyrighted (C) 1994
+*	Normunds Saumanis (normunds@rx.tech.swh.lv)
+*
+*  SYM53C500.c
+*	Bob Tracy (rct@frus.com)
+*	Original driver by Tom Corner (tcorner@via.at) was adapted
+*	from NCR53c406a.c which is Copyrighted (C) 1994, 1995, 1996 
+*	Normunds Saumanis (normunds@fi.ibm.com)
+*
+*  sym53c500.c
+*	Bob Tracy (rct@frus.com)
+*	Original by Tom Corner (tcorner@via.at) was adapted from a
+*	driver for the Qlogic SCSI card written by
+*	David Hinds (dhinds@allegro.stanford.edu).
+* 
+*  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, 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.
+*/
+
+#define SYM53C500_DEBUG 0
+#define VERBOSE_SYM53C500_DEBUG 0
+
+/*
+*  Set this to 0 if you encounter kernel lockups while transferring 
+*  data in PIO mode.  Note this can be changed via "sysfs".
+*/
+#define USE_FAST_PIO 1
+
+/* =============== End of user configurable parameters ============== */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/blkdev.h>
+#include <linux/spinlock.h>
+#include <linux/bitops.h>
+
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/irq.h>
+
+#include <scsi/scsi_ioctl.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+
+#include <pcmcia/cs_types.h>
+#include <pcmcia/cs.h>
+#include <pcmcia/cistpl.h>
+#include <pcmcia/ds.h>
+#include <pcmcia/ciscode.h>
+
+/* ================================================================== */
+
+#ifdef PCMCIA_DEBUG
+static int pc_debug = PCMCIA_DEBUG;
+module_param(pc_debug, int, 0);
+#define DEBUG(n, args...) if (pc_debug>(n)) printk(KERN_DEBUG args)
+static char *version =
+"sym53c500_cs.c 0.9a 2004/05/04 (Bob Tracy)";
+#else
+#define DEBUG(n, args...)
+#endif
+
+/* ================================================================== */
+
+/* Parameters that can be set with 'insmod' */
+
+/* Bit map of interrupts to choose from */
+static unsigned int irq_mask = 0xdeb8;	/* 3, 6, 7, 9-12, 14, 15 */
+static int irq_list[4] = { -1 };
+static int num_irqs = 1;
+
+module_param(irq_mask, int, 0);
+MODULE_PARM_DESC(irq_mask, "IRQ mask bits (default: 0xdeb8)");
+module_param_array(irq_list, int, num_irqs, 0);
+MODULE_PARM_DESC(irq_list, "Comma-separated list of up to 4 IRQs to try (default: auto select).");
+
+/* ================================================================== */
+
+#define SYNC_MODE 0 		/* Synchronous transfer mode */
+
+/* Default configuration */
+#define C1_IMG   0x07		/* ID=7 */
+#define C2_IMG   0x48		/* FE SCSI2 */
+#define C3_IMG   0x20		/* CDB */
+#define C4_IMG   0x04		/* ANE */
+#define C5_IMG   0xa4		/* ? changed from b6= AA PI SIE POL */
+#define C7_IMG   0x80		/* added for SYM53C500 t. corner */
+
+/* Hardware Registers: offsets from io_port (base) */
+
+/* Control Register Set 0 */
+#define TC_LSB		0x00		/* transfer counter lsb */
+#define TC_MSB		0x01		/* transfer counter msb */
+#define SCSI_FIFO	0x02		/* scsi fifo register */
+#define CMD_REG		0x03		/* command register */
+#define STAT_REG	0x04		/* status register */
+#define DEST_ID		0x04		/* selection/reselection bus id */
+#define INT_REG		0x05		/* interrupt status register */
+#define SRTIMOUT	0x05		/* select/reselect timeout reg */
+#define SEQ_REG		0x06		/* sequence step register */
+#define SYNCPRD		0x06		/* synchronous transfer period */
+#define FIFO_FLAGS	0x07		/* indicates # of bytes in fifo */
+#define SYNCOFF		0x07		/* synchronous offset register */
+#define CONFIG1		0x08		/* configuration register */
+#define CLKCONV		0x09		/* clock conversion register */
+/* #define TESTREG	0x0A */		/* test mode register */
+#define CONFIG2		0x0B		/* configuration 2 register */
+#define CONFIG3		0x0C		/* configuration 3 register */
+#define CONFIG4		0x0D		/* configuration 4 register */
+#define TC_HIGH		0x0E		/* transfer counter high */
+/* #define FIFO_BOTTOM	0x0F */		/* reserve FIFO byte register */
+
+/* Control Register Set 1 */
+/* #define JUMPER_SENSE	0x00 */		/* jumper sense port reg (r/w) */
+/* #define SRAM_PTR	0x01 */		/* SRAM address pointer reg (r/w) */
+/* #define SRAM_DATA	0x02 */		/* SRAM data register (r/w) */
+#define PIO_FIFO	0x04		/* PIO FIFO registers (r/w) */
+/* #define PIO_FIFO1	0x05 */		/*  */
+/* #define PIO_FIFO2	0x06 */		/*  */
+/* #define PIO_FIFO3	0x07 */		/*  */
+#define PIO_STATUS	0x08		/* PIO status (r/w) */
+/* #define ATA_CMD	0x09 */		/* ATA command/status reg (r/w) */
+/* #define ATA_ERR	0x0A */		/* ATA features/error reg (r/w) */
+#define PIO_FLAG	0x0B		/* PIO flag interrupt enable (r/w) */
+#define CONFIG5		0x09		/* configuration 5 register */
+/* #define SIGNATURE	0x0E */		/* signature register (r) */
+/* #define CONFIG6	0x0F */		/* configuration 6 register (r) */
+#define CONFIG7		0x0d
+
+/* select register set 0 */
+#define REG0(x)		(outb(C4_IMG, (x) + CONFIG4))
+/* select register set 1 */
+#define REG1(x)		outb(C7_IMG, (x) + CONFIG7); outb(C5_IMG, (x) + CONFIG5)
+
+#if SYM53C500_DEBUG
+#define DEB(x) x
+#else
+#define DEB(x)
+#endif
+
+#if VERBOSE_SYM53C500_DEBUG
+#define VDEB(x) x
+#else
+#define VDEB(x)
+#endif
+
+#define LOAD_DMA_COUNT(x, count) \
+  outb(count & 0xff, (x) + TC_LSB); \
+  outb((count >> 8) & 0xff, (x) + TC_MSB); \
+  outb((count >> 16) & 0xff, (x) + TC_HIGH);
+
+/* Chip commands */
+#define DMA_OP               0x80
+
+#define SCSI_NOP             0x00
+#define FLUSH_FIFO           0x01
+#define CHIP_RESET           0x02
+#define SCSI_RESET           0x03
+#define RESELECT             0x40
+#define SELECT_NO_ATN        0x41
+#define SELECT_ATN           0x42
+#define SELECT_ATN_STOP      0x43
+#define ENABLE_SEL           0x44
+#define DISABLE_SEL          0x45
+#define SELECT_ATN3          0x46
+#define RESELECT3            0x47
+#define TRANSFER_INFO        0x10
+#define INIT_CMD_COMPLETE    0x11
+#define MSG_ACCEPT           0x12
+#define TRANSFER_PAD         0x18
+#define SET_ATN              0x1a
+#define RESET_ATN            0x1b
+#define SEND_MSG             0x20
+#define SEND_STATUS          0x21
+#define SEND_DATA            0x22
+#define DISCONN_SEQ          0x23
+#define TERMINATE_SEQ        0x24
+#define TARG_CMD_COMPLETE    0x25
+#define DISCONN              0x27
+#define RECV_MSG             0x28
+#define RECV_CMD             0x29
+#define RECV_DATA            0x2a
+#define RECV_CMD_SEQ         0x2b
+#define TARGET_ABORT_DMA     0x04
+
+/* ================================================================== */
+
+struct scsi_info_t {
+	dev_link_t link;
+	dev_node_t node;
+	struct Scsi_Host *host;
+	unsigned short manf_id;
+};
+
+/*
+*  Repository for per-instance host data.
+*/
+struct sym53c500_data {
+	struct scsi_cmnd *current_SC;
+	int fast_pio;
+};
+
+enum Phase {
+    idle,
+    data_out,
+    data_in,
+    command_ph,
+    status_ph,
+    message_out,
+    message_in
+};
+
+/* ================================================================== */
+
+/*
+*  Global (within this module) variables other than
+*  sym53c500_driver_template (the scsi_host_template).
+*/
+static dev_link_t *dev_list;
+static dev_info_t dev_info = "sym53c500_cs";
+
+/* ================================================================== */
+
+static void
+chip_init(int io_port)
+{
+	REG1(io_port);
+	outb(0x01, io_port + PIO_STATUS);
+	outb(0x00, io_port + PIO_FLAG);
+
+	outb(C4_IMG, io_port + CONFIG4);	/* REG0(io_port); */
+	outb(C3_IMG, io_port + CONFIG3);
+	outb(C2_IMG, io_port + CONFIG2);
+	outb(C1_IMG, io_port + CONFIG1);
+
+	outb(0x05, io_port + CLKCONV);	/* clock conversion factor */
+	outb(0x9C, io_port + SRTIMOUT);	/* Selection timeout */
+	outb(0x05, io_port + SYNCPRD);	/* Synchronous transfer period */
+	outb(SYNC_MODE, io_port + SYNCOFF);	/* synchronous mode */  
+}
+
+static void
+SYM53C500_int_host_reset(int io_port)
+{
+	outb(C4_IMG, io_port + CONFIG4);	/* REG0(io_port); */
+	outb(CHIP_RESET, io_port + CMD_REG);
+	outb(SCSI_NOP, io_port + CMD_REG);	/* required after reset */
+	outb(SCSI_RESET, io_port + CMD_REG);
+	chip_init(io_port);
+}
+
+static __inline__ int
+SYM53C500_pio_read(int fast_pio, int base, unsigned char *request, unsigned int reqlen)
+{
+	int i;
+	int len;	/* current scsi fifo size */
+
+	REG1(base);
+	while (reqlen) {
+		i = inb(base + PIO_STATUS);
+		/* VDEB(printk("pio_status=%x\n", i)); */
+		if (i & 0x80) 
+			return 0;
+
+		switch (i & 0x1e) {
+		default:
+		case 0x10:	/* fifo empty */
+			len = 0;
+			break;
+		case 0x0:
+			len = 1;
+			break; 
+		case 0x8:	/* fifo 1/3 full */
+			len = 42;
+			break;
+		case 0xc:	/* fifo 2/3 full */
+			len = 84;
+			break;
+		case 0xe:	/* fifo full */
+			len = 128;
+			break;
+		}
+
+		if ((i & 0x40) && len == 0) { /* fifo empty and interrupt occurred */
+			return 0;
+		}
+
+		if (len) {
+			if (len > reqlen) 
+				len = reqlen;
+
+			if (fast_pio && len > 3) {
+				insl(base + PIO_FIFO, request, len >> 2);
+				request += len & 0xfc; 
+				reqlen -= len & 0xfc; 
+			} else {
+				while (len--) {
+					*request++ = inb(base + PIO_FIFO);
+					reqlen--;
+				}
+			} 
+		}
+	}
+	return 0;
+}
+
+static __inline__ int
+SYM53C500_pio_write(int fast_pio, int base, unsigned char *request, unsigned int reqlen)
+{
+	int i = 0;
+	int len;	/* current scsi fifo size */
+
+	REG1(base);
+	while (reqlen && !(i & 0x40)) {
+		i = inb(base + PIO_STATUS);
+		/* VDEB(printk("pio_status=%x\n", i)); */
+		if (i & 0x80)	/* error */
+			return 0;
+
+		switch (i & 0x1e) {
+		case 0x10:
+			len = 128;
+			break;
+		case 0x0:
+			len = 84;
+			break;
+		case 0x8:
+			len = 42;
+			break;
+		case 0xc:
+			len = 1;
+			break;
+		default:
+		case 0xe:
+			len = 0;
+			break;
+		}
+
+		if (len) {
+			if (len > reqlen)
+				len = reqlen;
+
+			if (fast_pio && len > 3) {
+				outsl(base + PIO_FIFO, request, len >> 2);
+				request += len & 0xfc;
+				reqlen -= len & 0xfc;
+			} else {
+				while (len--) {
+					outb(*request++, base + PIO_FIFO);
+					reqlen--;
+				}
+			}
+		}
+	}
+	return 0;
+}
+
+static irqreturn_t
+SYM53C500_intr(int irq, void *dev_id, struct pt_regs *regs)
+{
+	unsigned long flags;
+	struct Scsi_Host *dev = dev_id;
+	DEB(unsigned char fifo_size;)
+	DEB(unsigned char seq_reg;)
+	unsigned char status, int_reg;
+	unsigned char pio_status;
+	struct scatterlist *sglist;
+	unsigned int sgcount;
+	int port_base = dev->io_port;
+	struct sym53c500_data *data =
+	    (struct sym53c500_data *)dev->hostdata;
+	struct scsi_cmnd *curSC = data->current_SC;
+	int fast_pio = data->fast_pio;
+
+	spin_lock_irqsave(dev->host_lock, flags);
+
+	VDEB(printk("SYM53C500_intr called\n"));
+
+	REG1(port_base);
+	pio_status = inb(port_base + PIO_STATUS);
+	REG0(port_base);
+	status = inb(port_base + STAT_REG);
+	DEB(seq_reg = inb(port_base + SEQ_REG));
+	int_reg = inb(port_base + INT_REG);
+	DEB(fifo_size = inb(port_base + FIFO_FLAGS) & 0x1f);
+
+#if SYM53C500_DEBUG
+	printk("status=%02x, seq_reg=%02x, int_reg=%02x, fifo_size=%02x", 
+	    status, seq_reg, int_reg, fifo_size);
+	printk(", pio=%02x\n", pio_status);
+#endif /* SYM53C500_DEBUG */
+
+	if (int_reg & 0x80) {	/* SCSI reset intr */
+		DEB(printk("SYM53C500: reset intr received\n"));
+		curSC->result = DID_RESET << 16;
+		goto idle_out;
+	}
+
+	if (pio_status & 0x80) {
+		printk("SYM53C500: Warning: PIO error!\n");
+		curSC->result = DID_ERROR << 16;
+		goto idle_out;
+	}
+
+	if (status & 0x20) {		/* Parity error */
+		printk("SYM53C500: Warning: parity error!\n");
+		curSC->result = DID_PARITY << 16;
+		goto idle_out;
+	}
+
+	if (status & 0x40) {		/* Gross error */
+		printk("SYM53C500: Warning: gross error!\n");
+		curSC->result = DID_ERROR << 16;
+		goto idle_out;
+	}
+
+	if (int_reg & 0x20) {		/* Disconnect */
+		DEB(printk("SYM53C500: disconnect intr received\n"));
+		if (curSC->SCp.phase != message_in) {	/* Unexpected disconnect */
+			curSC->result = DID_NO_CONNECT << 16;
+		} else {	/* Command complete, return status and message */
+			curSC->result = (curSC->SCp.Status & 0xff)
+			    | ((curSC->SCp.Message & 0xff) << 8) | (DID_OK << 16);
+		}
+		goto idle_out;
+	}
+
+	switch (status & 0x07) {	/* scsi phase */
+	case 0x00:			/* DATA-OUT */
+		if (int_reg & 0x10) {	/* Target requesting info transfer */
+			curSC->SCp.phase = data_out;
+			VDEB(printk("SYM53C500: Data-Out phase\n"));
+			outb(FLUSH_FIFO, port_base + CMD_REG);
+			LOAD_DMA_COUNT(port_base, curSC->request_bufflen);	/* Max transfer size */
+			outb(TRANSFER_INFO | DMA_OP, port_base + CMD_REG);
+			if (!curSC->use_sg)	/* Don't use scatter-gather */
+				SYM53C500_pio_write(fast_pio, port_base, curSC->request_buffer, curSC->request_bufflen);
+			else {	/* use scatter-gather */
+				sgcount = curSC->use_sg;
+				sglist = curSC->request_buffer;
+				while (sgcount--) {
+					SYM53C500_pio_write(fast_pio, port_base, page_address(sglist->page) + sglist->offset, sglist->length);
+					sglist++;
+				}
+			}
+			REG0(port_base);
+		}
+		break;
+
+	case 0x01:		/* DATA-IN */
+		if (int_reg & 0x10) {	/* Target requesting info transfer */
+			curSC->SCp.phase = data_in;
+			VDEB(printk("SYM53C500: Data-In phase\n"));
+			outb(FLUSH_FIFO, port_base + CMD_REG);
+			LOAD_DMA_COUNT(port_base, curSC->request_bufflen);	/* Max transfer size */
+			outb(TRANSFER_INFO | DMA_OP, port_base + CMD_REG);
+			if (!curSC->use_sg)	/* Don't use scatter-gather */
+				SYM53C500_pio_read(fast_pio, port_base, curSC->request_buffer, curSC->request_bufflen);
+			else {	/* Use scatter-gather */
+				sgcount = curSC->use_sg;
+				sglist = curSC->request_buffer;
+				while (sgcount--) {
+					SYM53C500_pio_read(fast_pio, port_base, page_address(sglist->page) + sglist->offset, sglist->length);
+					sglist++;
+				}
+			}
+			REG0(port_base);
+		}
+		break;
+
+	case 0x02:		/* COMMAND */
+		curSC->SCp.phase = command_ph;
+		printk("SYM53C500: Warning: Unknown interrupt occurred in command phase!\n");
+		break;
+
+	case 0x03:		/* STATUS */
+		curSC->SCp.phase = status_ph;
+		VDEB(printk("SYM53C500: Status phase\n"));
+		outb(FLUSH_FIFO, port_base + CMD_REG);
+		outb(INIT_CMD_COMPLETE, port_base + CMD_REG);
+		break;
+
+	case 0x04:		/* Reserved */
+	case 0x05:		/* Reserved */
+		printk("SYM53C500: WARNING: Reserved phase!!!\n");
+		break;
+
+	case 0x06:		/* MESSAGE-OUT */
+		DEB(printk("SYM53C500: Message-Out phase\n"));
+		curSC->SCp.phase = message_out;
+		outb(SET_ATN, port_base + CMD_REG);	/* Reject the message */
+		outb(MSG_ACCEPT, port_base + CMD_REG);
+		break;
+
+	case 0x07:		/* MESSAGE-IN */
+		VDEB(printk("SYM53C500: Message-In phase\n"));
+		curSC->SCp.phase = message_in;
+
+		curSC->SCp.Status = inb(port_base + SCSI_FIFO);
+		curSC->SCp.Message = inb(port_base + SCSI_FIFO);
+
+		VDEB(printk("SCSI FIFO size=%d\n", inb(port_base + FIFO_FLAGS) & 0x1f));
+		DEB(printk("Status = %02x  Message = %02x\n", curSC->SCp.Status, curSC->SCp.Message));
+
+		if (curSC->SCp.Message == SAVE_POINTERS || curSC->SCp.Message == DISCONNECT) {
+			outb(SET_ATN, port_base + CMD_REG);	/* Reject message */
+			DEB(printk("Discarding SAVE_POINTERS message\n"));
+		}
+		outb(MSG_ACCEPT, port_base + CMD_REG);
+		break;
+	}
+out:
+	spin_unlock_irqrestore(dev->host_lock, flags);
+	return IRQ_HANDLED;
+
+idle_out:
+	curSC->SCp.phase = idle;
+	curSC->scsi_done(curSC);
+	goto out;
+}
+
+static void
+SYM53C500_release(dev_link_t *link)
+{
+	struct scsi_info_t *info = link->priv;
+	struct Scsi_Host *shost = info->host;
+
+	DEBUG(0, "SYM53C500_release(0x%p)\n", link);
+
+	/*
+	*  Do this before releasing/freeing resources.
+	*/
+	scsi_remove_host(shost);
+
+	/*
+	*  Interrupts getting hosed on card removal.  Try
+	*  the following code, mostly from qlogicfas.c.
+	*/
+	if (shost->irq)
+		free_irq(shost->irq, shost);
+	if (shost->dma_channel != 0xff)
+		free_dma(shost->dma_channel);
+	if (shost->io_port && shost->n_io_port)
+		release_region(shost->io_port, shost->n_io_port);
+
+	link->dev = NULL;
+
+	pcmcia_release_configuration(link->handle);
+	pcmcia_release_io(link->handle, &link->io);
+	pcmcia_release_irq(link->handle, &link->irq);
+
+	link->state &= ~DEV_CONFIG;
+
+	scsi_host_put(shost);
+} /* SYM53C500_release */
+
+static const char*
+SYM53C500_info(struct Scsi_Host *SChost)
+{
+	static char info_msg[256];
+	struct sym53c500_data *data =
+	    (struct sym53c500_data *)SChost->hostdata;
+
+	DEB(printk("SYM53C500_info called\n"));
+	(void)snprintf(info_msg, sizeof(info_msg),
+	    "SYM53C500 at 0x%lx, IRQ %d, %s PIO mode.", 
+	    SChost->io_port, SChost->irq, data->fast_pio ? "fast" : "slow");
+	return (info_msg);
+}
+
+static int 
+SYM53C500_queue(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *))
+{
+	int i;
+	int port_base = SCpnt->device->host->io_port;
+	struct sym53c500_data *data =
+	    (struct sym53c500_data *)SCpnt->device->host->hostdata;
+
+	VDEB(printk("SYM53C500_queue called\n"));
+
+	DEB(printk("cmd=%02x, cmd_len=%02x, target=%02x, lun=%02x, bufflen=%d\n", 
+	    SCpnt->cmnd[0], SCpnt->cmd_len, SCpnt->device->id, 
+	    SCpnt->device->lun,  SCpnt->request_bufflen));
+
+	VDEB(for (i = 0; i < SCpnt->cmd_len; i++)
+	    printk("cmd[%d]=%02x  ", i, SCpnt->cmnd[i]));
+	VDEB(printk("\n"));
+
+	data->current_SC = SCpnt;
+	data->current_SC->scsi_done = done;
+	data->current_SC->SCp.phase = command_ph;
+	data->current_SC->SCp.Status = 0;
+	data->current_SC->SCp.Message = 0;
+
+	/* We are locked here already by the mid layer */
+	REG0(port_base);
+	outb(SCpnt->device->id, port_base + DEST_ID);	/* set destination */
+	outb(FLUSH_FIFO, port_base + CMD_REG);	/* reset the fifos */
+
+	for (i = 0; i < SCpnt->cmd_len; i++) {
+		outb(SCpnt->cmnd[i], port_base + SCSI_FIFO);
+	}
+	outb(SELECT_NO_ATN, port_base + CMD_REG);
+
+	return 0;
+}
+
+static int 
+SYM53C500_host_reset(struct scsi_cmnd *SCpnt)
+{
+	int port_base = SCpnt->device->host->io_port;
+
+	DEB(printk("SYM53C500_host_reset called\n"));
+	SYM53C500_int_host_reset(port_base);
+
+	return SUCCESS;
+}
+
+static int 
+SYM53C500_biosparm(struct scsi_device *disk,
+    struct block_device *dev,
+    sector_t capacity, int *info_array)
+{
+	int size;
+
+	DEB(printk("SYM53C500_biosparm called\n"));
+
+	size = capacity;
+	info_array[0] = 64;		/* heads */
+	info_array[1] = 32;		/* sectors */
+	info_array[2] = size >> 11;	/* cylinders */
+	if (info_array[2] > 1024) {	/* big disk */
+		info_array[0] = 255;
+		info_array[1] = 63;
+		info_array[2] = size / (255 * 63);
+	}
+	return 0;
+}
+
+static ssize_t
+SYM53C500_show_irq(struct class_device *cdev, char *buf)
+{
+	struct Scsi_Host *SHp = class_to_shost(cdev);
+
+	return snprintf(buf, 4, "%d\n", SHp->irq);
+}
+
+static ssize_t
+SYM53C500_show_ioport(struct class_device *cdev, char *buf)
+{
+	struct Scsi_Host *SHp = class_to_shost(cdev);
+
+	return snprintf(buf, 8, "0x%lx\n", SHp->io_port);
+}
+
+static ssize_t
+SYM53C500_show_pio(struct class_device *cdev, char *buf)
+{
+	struct Scsi_Host *SHp = class_to_shost(cdev);
+	struct sym53c500_data *data =
+	    (struct sym53c500_data *)SHp->hostdata;
+
+	return snprintf(buf, 4, "%d\n", data->fast_pio);
+}
+
+static ssize_t
+SYM53C500_store_pio(struct class_device *cdev, const char *buf, size_t count)
+{
+	int pio;
+	struct Scsi_Host *SHp = class_to_shost(cdev);
+	struct sym53c500_data *data =
+	    (struct sym53c500_data *)SHp->hostdata;
+
+	pio = simple_strtoul(buf, NULL, 0);
+	if (pio == 0 || pio == 1) {
+		data->fast_pio = pio;
+		return count;
+	}
+	else
+		return -EINVAL;
+}
+
+/*
+*  SCSI HBA device attributes we want to
+*  make available via sysfs.
+*/
+static struct class_device_attribute SYM53C500_irq_attr = {
+	.attr = {
+		.name = "irq",
+		.mode = S_IRUGO,
+	},
+	.show = SYM53C500_show_irq,
+};
+
+static struct class_device_attribute SYM53C500_ioport_attr = {
+	.attr = {
+		.name = "ioport",
+		.mode = S_IRUGO,
+	},
+	.show = SYM53C500_show_ioport,
+};
+
+static struct class_device_attribute SYM53C500_pio_attr = {
+	.attr = {
+		.name = "fast_pio",
+		.mode = (S_IRUGO | S_IWUSR),
+	},
+	.show = SYM53C500_show_pio,
+	.store = SYM53C500_store_pio,
+};
+
+static struct class_device_attribute *SYM53C500_shost_attrs[] = {
+	&SYM53C500_irq_attr,
+	&SYM53C500_ioport_attr,
+	&SYM53C500_pio_attr,
+	NULL,
+};
+
+/*
+*  scsi_host_template initializer
+*/
+static struct scsi_host_template sym53c500_driver_template = {
+     .module			= THIS_MODULE,
+     .name			= "SYM53C500",
+     .info			= SYM53C500_info,
+     .queuecommand		= SYM53C500_queue,
+     .eh_host_reset_handler	= SYM53C500_host_reset,
+     .bios_param		= SYM53C500_biosparm,
+     .proc_name			= "SYM53C500",
+     .can_queue			= 1,
+     .this_id			= 7,
+     .sg_tablesize		= 32,
+     .cmd_per_lun		= 1,
+     .use_clustering		= ENABLE_CLUSTERING,
+     .shost_attrs		= SYM53C500_shost_attrs
+};
+
+#define CS_CHECK(fn, ret) \
+do { last_fn = (fn); if ((last_ret = (ret)) != 0) goto cs_failed; } while (0)
+
+static void
+SYM53C500_config(dev_link_t *link)
+{
+	client_handle_t handle = link->handle;
+	struct scsi_info_t *info = link->priv;
+	tuple_t tuple;
+	cisparse_t parse;
+	int i, last_ret, last_fn;
+	int irq_level, port_base;
+	unsigned short tuple_data[32];
+	struct Scsi_Host *host;
+	struct scsi_host_template *tpnt = &sym53c500_driver_template;
+	struct sym53c500_data *data;
+
+	DEBUG(0, "SYM53C500_config(0x%p)\n", link);
+
+	tuple.TupleData = (cisdata_t *)tuple_data;
+	tuple.TupleDataMax = 64;
+	tuple.TupleOffset = 0;
+	tuple.DesiredTuple = CISTPL_CONFIG;
+	CS_CHECK(GetFirstTuple, pcmcia_get_first_tuple(handle, &tuple));
+	CS_CHECK(GetTupleData, pcmcia_get_tuple_data(handle, &tuple));
+	CS_CHECK(ParseTuple, pcmcia_parse_tuple(handle, &tuple, &parse));
+	link->conf.ConfigBase = parse.config.base;
+
+	tuple.DesiredTuple = CISTPL_MANFID;
+	if ((pcmcia_get_first_tuple(handle, &tuple) == CS_SUCCESS) &&
+	    (pcmcia_get_tuple_data(handle, &tuple) == CS_SUCCESS))
+		info->manf_id = le16_to_cpu(tuple.TupleData[0]);
+
+	/* Configure card */
+	link->state |= DEV_CONFIG;
+
+	tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
+	CS_CHECK(GetFirstTuple, pcmcia_get_first_tuple(handle, &tuple));
+	while (1) {
+		if (pcmcia_get_tuple_data(handle, &tuple) != 0 ||
+		    pcmcia_parse_tuple(handle, &tuple, &parse) != 0)
+			goto next_entry;
+		link->conf.ConfigIndex = parse.cftable_entry.index;
+		link->io.BasePort1 = parse.cftable_entry.io.win[0].base;
+		link->io.NumPorts1 = parse.cftable_entry.io.win[0].len;
+
+		if (link->io.BasePort1 != 0) {
+			i = pcmcia_request_io(handle, &link->io);
+			if (i == CS_SUCCESS)
+				break;
+		}
+next_entry:
+		CS_CHECK(GetNextTuple, pcmcia_get_next_tuple(handle, &tuple));
+	}
+
+	CS_CHECK(RequestIRQ, pcmcia_request_irq(handle, &link->irq));
+	CS_CHECK(RequestConfiguration, pcmcia_request_configuration(handle, &link->conf));
+
+	/*
+	*  That's the trouble with copying liberally from another driver.
+	*  Some things probably aren't relevant, and I suspect this entire
+	*  section dealing with manufacturer IDs can be scrapped.	--rct
+	*/
+	if ((info->manf_id == MANFID_MACNICA) ||
+	    (info->manf_id == MANFID_PIONEER) ||
+	    (info->manf_id == 0x0098)) {
+		/* set ATAcmd */
+		outb(0xb4, link->io.BasePort1 + 0xd);
+		outb(0x24, link->io.BasePort1 + 0x9);
+		outb(0x04, link->io.BasePort1 + 0xd);
+	}
+
+	/*
+	*  irq_level == 0 implies tpnt->can_queue == 0, which
+	*  is not supported in 2.6.  Thus, only irq_level > 0
+	*  will be allowed.
+	*
+	*  Possible port_base values are as follows:
+	*
+	*	0x130, 0x230, 0x280, 0x290,
+	*	0x320, 0x330, 0x340, 0x350
+	*/
+	port_base = link->io.BasePort1;
+	irq_level = link->irq.AssignedIRQ;
+
+	DEB(printk("SYM53C500: port_base=0x%x, irq=%d, fast_pio=%d\n",
+	    port_base, irq_level, USE_FAST_PIO);)
+
+	chip_init(port_base);
+
+	host = scsi_host_alloc(tpnt, sizeof(struct sym53c500_data));
+	if (!host) {
+		printk("SYM53C500: Unable to register host, giving up.\n");
+		goto err_release;
+	}
+
+	data = (struct sym53c500_data *)host->hostdata;
+
+	if (irq_level > 0) {
+		if (request_irq(irq_level, SYM53C500_intr, 0, "SYM53C500", host)) {
+			printk("SYM53C500: unable to allocate IRQ %d\n", irq_level);
+			goto err_free_scsi;
+		}
+		DEB(printk("SYM53C500: allocated IRQ %d\n", irq_level));
+	} else if (irq_level == 0) {
+		DEB(printk("SYM53C500: No interrupts detected\n"));
+		goto err_free_scsi;
+	} else {
+		DEB(printk("SYM53C500: Shouldn't get here!\n"));
+		goto err_free_scsi;
+	}
+
+	host->unique_id = port_base;
+	host->irq = irq_level;
+	host->io_port = port_base;
+	host->n_io_port = 0x10;
+	host->dma_channel = -1;
+
+	/*
+	*  Note fast_pio is set to USE_FAST_PIO by
+	*  default, but can be changed via "sysfs".
+	*/
+	data->fast_pio = USE_FAST_PIO;
+
+	sprintf(info->node.dev_name, "scsi%d", host->host_no);
+	link->dev = &info->node;
+	info->host = host;
+
+	if (scsi_add_host(host, NULL))
+		goto err_free_irq;
+
+	scsi_scan_host(host);
+
+	goto out;	/* SUCCESS */
+
+err_free_irq:
+	free_irq(irq_level, host);
+err_free_scsi:
+	scsi_host_put(host);
+err_release:
+	release_region(port_base, 0x10);
+	printk(KERN_INFO "sym53c500_cs: no SCSI devices found\n");
+
+out:
+	link->state &= ~DEV_CONFIG_PENDING;
+	return;
+
+cs_failed:
+	cs_error(link->handle, last_fn, last_ret);
+	SYM53C500_release(link);
+	return;
+} /* SYM53C500_config */
+
+static int
+SYM53C500_event(event_t event, int priority, event_callback_args_t *args)
+{
+	dev_link_t *link = args->client_data;
+	struct scsi_info_t *info = link->priv;
+
+	DEBUG(1, "SYM53C500_event(0x%06x)\n", event);
+
+	switch (event) {
+	case CS_EVENT_CARD_REMOVAL:
+		link->state &= ~DEV_PRESENT;
+		if (link->state & DEV_CONFIG)
+			SYM53C500_release(link);
+		break;
+	case CS_EVENT_CARD_INSERTION:
+		link->state |= DEV_PRESENT | DEV_CONFIG_PENDING;
+		SYM53C500_config(link);
+		break;
+	case CS_EVENT_PM_SUSPEND:
+		link->state |= DEV_SUSPEND;
+		/* Fall through... */
+	case CS_EVENT_RESET_PHYSICAL:
+		if (link->state & DEV_CONFIG)
+			pcmcia_release_configuration(link->handle);
+		break;
+	case CS_EVENT_PM_RESUME:
+		link->state &= ~DEV_SUSPEND;
+		/* Fall through... */
+	case CS_EVENT_CARD_RESET:
+		if (link->state & DEV_CONFIG) {
+			pcmcia_request_configuration(link->handle, &link->conf);
+			/* See earlier comment about manufacturer IDs. */
+			if ((info->manf_id == MANFID_MACNICA) ||
+			    (info->manf_id == MANFID_PIONEER) ||
+			    (info->manf_id == 0x0098)) {
+				outb(0x80, link->io.BasePort1 + 0xd);
+				outb(0x24, link->io.BasePort1 + 0x9);
+				outb(0x04, link->io.BasePort1 + 0xd);
+			}
+			/*
+			*  If things don't work after a "resume",
+			*  this is a good place to start looking.
+			*/
+			SYM53C500_int_host_reset(link->io.BasePort1);
+		}
+		break;
+	}
+	return 0;
+} /* SYM53C500_event */
+
+static void
+SYM53C500_detach(dev_link_t *link)
+{
+	dev_link_t **linkp;
+
+	DEBUG(0, "SYM53C500_detach(0x%p)\n", link);
+
+	/* Locate device structure */
+	for (linkp = &dev_list; *linkp; linkp = &(*linkp)->next)
+		if (*linkp == link)
+			break;
+	if (*linkp == NULL)
+		return;
+
+	if (link->state & DEV_CONFIG)
+		SYM53C500_release(link);
+
+	if (link->handle)
+		pcmcia_deregister_client(link->handle);
+
+	/* Unlink device structure, free bits. */
+	*linkp = link->next;
+	kfree(link->priv);
+	link->priv = NULL;
+} /* SYM53C500_detach */
+
+static dev_link_t *
+SYM53C500_attach(void)
+{
+	struct scsi_info_t *info;
+	client_reg_t client_reg;
+	dev_link_t *link;
+	int i, ret;
+
+	DEBUG(0, "SYM53C500_attach()\n");
+
+	/* Create new SCSI device */
+	info = kmalloc(sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return NULL;
+	memset(info, 0, sizeof(*info));
+	link = &info->link;
+	link->priv = info;
+	link->io.NumPorts1 = 16;
+	link->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO;
+	link->io.IOAddrLines = 10;
+	link->irq.Attributes = IRQ_TYPE_EXCLUSIVE;
+	link->irq.IRQInfo1 = IRQ_INFO2_VALID | IRQ_LEVEL_ID;
+	if (irq_list[0] == -1)
+		link->irq.IRQInfo2 = irq_mask;
+	else
+		for (i = 0; i < 4; i++)
+			link->irq.IRQInfo2 |= 1 << irq_list[i];
+	link->conf.Attributes = CONF_ENABLE_IRQ;
+	link->conf.Vcc = 50;
+	link->conf.IntType = INT_MEMORY_AND_IO;
+	link->conf.Present = PRESENT_OPTION;
+
+	/* Register with Card Services */
+	link->next = dev_list;
+	dev_list = link;
+	client_reg.dev_info = &dev_info;
+	client_reg.Attributes = INFO_IO_CLIENT | INFO_CARD_SHARE;
+	client_reg.event_handler = &SYM53C500_event;
+	client_reg.EventMask = CS_EVENT_RESET_REQUEST | CS_EVENT_CARD_RESET |
+	    CS_EVENT_CARD_INSERTION | CS_EVENT_CARD_REMOVAL |
+	    CS_EVENT_PM_SUSPEND | CS_EVENT_PM_RESUME;
+	client_reg.Version = 0x0210;
+	client_reg.event_callback_args.client_data = link;
+	ret = pcmcia_register_client(&link->handle, &client_reg);
+	if (ret != 0) {
+		cs_error(link->handle, RegisterClient, ret);
+		SYM53C500_detach(link);
+		return NULL;
+	}
+
+	return link;
+} /* SYM53C500_attach */
+
+MODULE_AUTHOR("Bob Tracy <rct@frus.com>");
+MODULE_DESCRIPTION("SYM53C500 PCMCIA SCSI driver");
+MODULE_LICENSE("GPL");
+
+static struct pcmcia_driver sym53c500_cs_driver = {
+	.owner		= THIS_MODULE,
+	.drv		= {
+		.name	= "sym53c500_cs",
+	},
+	.attach		= SYM53C500_attach,
+	.detach		= SYM53C500_detach,
+};
+
+static int __init
+init_sym53c500_cs(void)
+{
+	return pcmcia_register_driver(&sym53c500_cs_driver);
+}
+
+static void __exit
+exit_sym53c500_cs(void)
+{
+	pcmcia_unregister_driver(&sym53c500_cs_driver);
+}
+
+module_init(init_sym53c500_cs);
+module_exit(exit_sym53c500_cs);