drivers/ide/pci/trm290.c - linux - Git at Google

 /*
  *  linux/drivers/ide/pci/trm290.c		Version 1.05	Dec. 30, 2007
  *
  *  Copyright (c) 1997-1998  Mark Lord
  *  Copyright (c) 2007       MontaVista Software, Inc. <source@mvista.com>
  *  May be copied or modified under the terms of the GNU General Public License
  *
  *  June 22, 2004 - get rid of check_region
  *                   - Jesper Juhl
  *
  */

 /*
  * This module provides support for the bus-master IDE DMA function
  * of the Tekram TRM290 chip, used on a variety of PCI IDE add-on boards,
  * including a "Precision Instruments" board.  The TRM290 pre-dates
  * the sff-8038 standard (ide-dma.c) by a few months, and differs
  * significantly enough to warrant separate routines for some functions,
  * while re-using others from ide-dma.c.
  *
  * EXPERIMENTAL!  It works for me (a sample of one).
  *
  * Works reliably for me in DMA mode (READs only),
  * DMA WRITEs are disabled by default (see #define below);
  *
  * DMA is not enabled automatically for this chipset,
  * but can be turned on manually (with "hdparm -d1") at run time.
  *
  * I need volunteers with "spare" drives for further testing
  * and development, and maybe to help figure out the peculiarities.
  * Even knowing the registers (below), some things behave strangely.
  */

 #define TRM290_NO_DMA_WRITES	/* DMA writes seem unreliable sometimes */

 /*
  * TRM-290 PCI-IDE2 Bus Master Chip
  * ================================
  * The configuration registers are addressed in normal I/O port space
  * and are used as follows:
  *
  * trm290_base depends on jumper settings, and is probed for by ide-dma.c
  *
  * trm290_base+2 when WRITTEN: chiptest register (byte, write-only)
  *	bit7 must always be written as "1"
  *	bits6-2 undefined
  *	bit1 1=legacy_compatible_mode, 0=native_pci_mode
  *	bit0 1=test_mode, 0=normal(default)
  *
  * trm290_base+2 when READ: status register (byte, read-only)
  *	bits7-2 undefined
  *	bit1 channel0 busmaster interrupt status 0=none, 1=asserted
  *	bit0 channel0 interrupt status 0=none, 1=asserted
  *
  * trm290_base+3 Interrupt mask register
  *	bits7-5 undefined
  *	bit4 legacy_header: 1=present, 0=absent
  *	bit3 channel1 busmaster interrupt status 0=none, 1=asserted (read only)
  *	bit2 channel1 interrupt status 0=none, 1=asserted (read only)
  *	bit1 channel1 interrupt mask: 1=masked, 0=unmasked(default)
  *	bit0 channel0 interrupt mask: 1=masked, 0=unmasked(default)
  *
  * trm290_base+1 "CPR" Config Pointer Register (byte)
  *	bit7 1=autoincrement CPR bits 2-0 after each access of CDR
  *	bit6 1=min. 1 wait-state posted write cycle (default), 0=0 wait-state
  *	bit5 0=enabled master burst access (default), 1=disable  (write only)
  *	bit4 PCI DEVSEL# timing select: 1=medium(default), 0=fast
  *	bit3 0=primary IDE channel, 1=secondary IDE channel
  *	bits2-0 register index for accesses through CDR port
  *
  * trm290_base+0 "CDR" Config Data Register (word)
  *	two sets of seven config registers,
  *	selected by CPR bit 3 (channel) and CPR bits 2-0 (index 0 to 6),
  *	each index defined below:
  *
  * Index-0 Base address register for command block (word)
  *	defaults: 0x1f0 for primary, 0x170 for secondary
  *
  * Index-1 general config register (byte)
  *	bit7 1=DMA enable, 0=DMA disable
  *	bit6 1=activate IDE_RESET, 0=no action (default)
  *	bit5 1=enable IORDY, 0=disable IORDY (default)
  *	bit4 0=16-bit data port(default), 1=8-bit (XT) data port
  *	bit3 interrupt polarity: 1=active_low, 0=active_high(default)
  *	bit2 power-saving-mode(?): 1=enable, 0=disable(default) (write only)
  *	bit1 bus_master_mode(?): 1=enable, 0=disable(default)
  *	bit0 enable_io_ports: 1=enable(default), 0=disable
  *
  * Index-2 read-ahead counter preload bits 0-7 (byte, write only)
  *	bits7-0 bits7-0 of readahead count
  *
  * Index-3 read-ahead config register (byte, write only)
  *	bit7 1=enable_readahead, 0=disable_readahead(default)
  *	bit6 1=clear_FIFO, 0=no_action
  *	bit5 undefined
  *	bit4 mode4 timing control: 1=enable, 0=disable(default)
  *	bit3 undefined
  *	bit2 undefined
  *	bits1-0 bits9-8 of read-ahead count
  *
  * Index-4 base address register for control block (word)
  *	defaults: 0x3f6 for primary, 0x376 for secondary
  *
  * Index-5 data port timings (shared by both drives) (byte)
  *	standard PCI "clk" (clock) counts, default value = 0xf5
  *
  *	bits7-6 setup time:  00=1clk, 01=2clk, 10=3clk, 11=4clk
  *	bits5-3 hold time:	000=1clk, 001=2clk, 010=3clk,
  *				011=4clk, 100=5clk, 101=6clk,
  *				110=8clk, 111=12clk
  *	bits2-0 active time:	000=2clk, 001=3clk, 010=4clk,
  *				011=5clk, 100=6clk, 101=8clk,
  *				110=12clk, 111=16clk
  *
  * Index-6 command/control port timings (shared by both drives) (byte)
  *	same layout as Index-5, default value = 0xde
  *
  * Suggested CDR programming for PIO mode0 (600ns):
  *	0x01f0,0x21,0xff,0x80,0x03f6,0xf5,0xde	; primary
  *	0x0170,0x21,0xff,0x80,0x0376,0xf5,0xde	; secondary
  *
  * Suggested CDR programming for PIO mode3 (180ns):
  *	0x01f0,0x21,0xff,0x80,0x03f6,0x09,0xde	; primary
  *	0x0170,0x21,0xff,0x80,0x0376,0x09,0xde	; secondary
  *
  * Suggested CDR programming for PIO mode4 (120ns):
  *	0x01f0,0x21,0xff,0x80,0x03f6,0x00,0xde	; primary
  *	0x0170,0x21,0xff,0x80,0x0376,0x00,0xde	; secondary
  *
  */

 #include <linux/types.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/ioport.h>
 #include <linux/interrupt.h>
 #include <linux/blkdev.h>
 #include <linux/init.h>
 #include <linux/hdreg.h>
 #include <linux/pci.h>
 #include <linux/delay.h>
 #include <linux/ide.h>

 #include <asm/io.h>

 static void trm290_prepare_drive (ide_drive_t *drive, unsigned int use_dma)
 {
 	ide_hwif_t *hwif = HWIF(drive);
 	u16 reg = 0;
 	unsigned long flags;

 	/* select PIO or DMA */
 	reg = use_dma ? (0x21 | 0x82) : (0x21 & ~0x82);

 	local_irq_save(flags);

 	if (reg != hwif->select_data) {
 		hwif->select_data = reg;
 		/* set PIO/DMA */
 		outb(0x51 | (hwif->channel << 3), hwif->config_data + 1);
 		outw(reg & 0xff, hwif->config_data);
 	}

 	/* enable IRQ if not probing */
 	if (drive->present) {
 		reg = inw(hwif->config_data + 3);
 		reg &= 0x13;
 		reg &= ~(1 << hwif->channel);
 		outw(reg, hwif->config_data + 3);
 	}

 	local_irq_restore(flags);
 }

 static void trm290_selectproc (ide_drive_t *drive)
 {
 	trm290_prepare_drive(drive, drive->using_dma);
 }

 static void trm290_dma_exec_cmd(ide_drive_t *drive, u8 command)
 {
 	BUG_ON(HWGROUP(drive)->handler != NULL);	/* paranoia check */
 	ide_set_handler(drive, &ide_dma_intr, WAIT_CMD, NULL);
 	/* issue cmd to drive */
 	outb(command, IDE_COMMAND_REG);
 }

 static int trm290_dma_setup(ide_drive_t *drive)
 {
 	ide_hwif_t *hwif = drive->hwif;
 	struct request *rq = hwif->hwgroup->rq;
 	unsigned int count, rw;

 	if (rq_data_dir(rq)) {
 #ifdef TRM290_NO_DMA_WRITES
 		/* always use PIO for writes */
 		trm290_prepare_drive(drive, 0);	/* select PIO xfer */
 		return 1;
 #endif
 		rw = 1;
 	} else
 		rw = 2;

 	if (!(count = ide_build_dmatable(drive, rq))) {
 		/* try PIO instead of DMA */
 		trm290_prepare_drive(drive, 0); /* select PIO xfer */
 		return 1;
 	}
 	/* select DMA xfer */
 	trm290_prepare_drive(drive, 1);
 	outl(hwif->dmatable_dma | rw, hwif->dma_base);
 	drive->waiting_for_dma = 1;
 	/* start DMA */
 	outw(count * 2 - 1, hwif->dma_base + 2);
 	return 0;
 }

 static void trm290_dma_start(ide_drive_t *drive)
 {
 }

 static int trm290_ide_dma_end (ide_drive_t *drive)
 {
 	u16 status;

 	drive->waiting_for_dma = 0;
 	/* purge DMA mappings */
 	ide_destroy_dmatable(drive);
 	status = inw(HWIF(drive)->dma_base + 2);
 	return status != 0x00ff;
 }

 static int trm290_ide_dma_test_irq (ide_drive_t *drive)
 {
 	u16 status;

 	status = inw(HWIF(drive)->dma_base + 2);
 	return status == 0x00ff;
 }

 static void trm290_dma_host_set(ide_drive_t *drive, int on)
 {
 }

 static void __devinit init_hwif_trm290(ide_hwif_t *hwif)
 {
 	struct pci_dev *dev	= to_pci_dev(hwif->dev);
 	unsigned int  cfg_base	= pci_resource_start(dev, 4);
 	unsigned long flags;
 	u8 reg = 0;

 	if ((dev->class & 5) && cfg_base)
 		printk(KERN_INFO "TRM290: chip");
 	else {
 		cfg_base = 0x3df0;
 		printk(KERN_INFO "TRM290: using default");
 	}
 	printk(KERN_CONT " config base at 0x%04x\n", cfg_base);
 	hwif->config_data = cfg_base;
 	hwif->dma_base = (cfg_base + 4) ^ (hwif->channel ? 0x80 : 0);

 	printk(KERN_INFO "    %s: BM-DMA at 0x%04lx-0x%04lx",
 	       hwif->name, hwif->dma_base, hwif->dma_base + 3);

 	if (!request_region(hwif->dma_base, 4, hwif->name)) {
 		printk(KERN_CONT " -- Error, ports in use.\n");
 		return;
 	}

 	hwif->dmatable_cpu = pci_alloc_consistent(dev, PRD_ENTRIES * PRD_BYTES,
 						  &hwif->dmatable_dma);
 	if (!hwif->dmatable_cpu) {
 		printk(KERN_CONT " -- Error, unable to allocate DMA table.\n");
 		release_region(hwif->dma_base, 4);
 		return;
 	}
 	printk(KERN_CONT "\n");

 	local_irq_save(flags);
 	/* put config reg into first byte of hwif->select_data */
 	outb(0x51 | (hwif->channel << 3), hwif->config_data + 1);
 	/* select PIO as default */
 	hwif->select_data = 0x21;
 	outb(hwif->select_data, hwif->config_data);
 	/* get IRQ info */
 	reg = inb(hwif->config_data + 3);
 	/* mask IRQs for both ports */
 	reg = (reg & 0x10) | 0x03;
 	outb(reg, hwif->config_data + 3);
 	local_irq_restore(flags);

 	if (reg & 0x10)
 		/* legacy mode */
 		hwif->irq = hwif->channel ? 15 : 14;
 	else if (!hwif->irq && hwif->mate && hwif->mate->irq)
 		/* sharing IRQ with mate */
 		hwif->irq = hwif->mate->irq;

 	hwif->dma_host_set	= &trm290_dma_host_set;
 	hwif->dma_setup 	= &trm290_dma_setup;
 	hwif->dma_exec_cmd	= &trm290_dma_exec_cmd;
 	hwif->dma_start 	= &trm290_dma_start;
 	hwif->ide_dma_end	= &trm290_ide_dma_end;
 	hwif->ide_dma_test_irq	= &trm290_ide_dma_test_irq;

 	hwif->selectproc = &trm290_selectproc;
 #if 1
 	{
 	/*
 	 * My trm290-based card doesn't seem to work with all possible values
 	 * for the control basereg, so this kludge ensures that we use only
 	 * values that are known to work.  Ugh.		-ml
 	 */
 		u16 new, old, compat = hwif->channel ? 0x374 : 0x3f4;
 		static u16 next_offset = 0;
 		u8 old_mask;

 		outb(0x54 | (hwif->channel << 3), hwif->config_data + 1);
 		old = inw(hwif->config_data);
 		old &= ~1;
 		old_mask = inb(old + 2);
 		if (old != compat && old_mask == 0xff) {
 			/* leave lower 10 bits untouched */
 			compat += (next_offset += 0x400);
 			hwif->io_ports[IDE_CONTROL_OFFSET] = compat + 2;
 			outw(compat | 1, hwif->config_data);
 			new = inw(hwif->config_data);
 			printk(KERN_INFO "%s: control basereg workaround: "
 				"old=0x%04x, new=0x%04x\n",
 				hwif->name, old, new & ~1);
 		}
 	}
 #endif
 }

 static const struct ide_port_info trm290_chipset __devinitdata = {
 	.name		= "TRM290",
 	.init_hwif	= init_hwif_trm290,
 	.chipset	= ide_trm290,
 	.host_flags	= IDE_HFLAG_NO_ATAPI_DMA |
 #if 0 /* play it safe for now */
 			  IDE_HFLAG_TRUST_BIOS_FOR_DMA |
 #endif
 			  IDE_HFLAG_NO_AUTODMA |
 			  IDE_HFLAG_BOOTABLE |
 			  IDE_HFLAG_NO_LBA48,
 };

 static int __devinit trm290_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 {
 	return ide_setup_pci_device(dev, &trm290_chipset);
 }

 static const struct pci_device_id trm290_pci_tbl[] = {
 	{ PCI_VDEVICE(TEKRAM, PCI_DEVICE_ID_TEKRAM_DC290), 0 },
 	{ 0, },
 };
 MODULE_DEVICE_TABLE(pci, trm290_pci_tbl);

 static struct pci_driver driver = {
 	.name		= "TRM290_IDE",
 	.id_table	= trm290_pci_tbl,
 	.probe		= trm290_init_one,
 };

 static int __init trm290_ide_init(void)
 {
 	return ide_pci_register_driver(&driver);
 }

 module_init(trm290_ide_init);

 MODULE_AUTHOR("Mark Lord");
 MODULE_DESCRIPTION("PCI driver module for Tekram TRM290 IDE");
 MODULE_LICENSE("GPL");
	/*
	* linux/drivers/ide/pci/trm290.c Version 1.05 Dec. 30, 2007
	*
	* Copyright (c) 1997-1998 Mark Lord
	* Copyright (c) 2007 MontaVista Software, Inc. <source@mvista.com>
	* May be copied or modified under the terms of the GNU General Public License
	*
	* June 22, 2004 - get rid of check_region
	* - Jesper Juhl
	*
	*/

	/*
	* This module provides support for the bus-master IDE DMA function
	* of the Tekram TRM290 chip, used on a variety of PCI IDE add-on boards,
	* including a "Precision Instruments" board. The TRM290 pre-dates
	* the sff-8038 standard (ide-dma.c) by a few months, and differs
	* significantly enough to warrant separate routines for some functions,
	* while re-using others from ide-dma.c.
	*
	* EXPERIMENTAL! It works for me (a sample of one).
	*
	* Works reliably for me in DMA mode (READs only),
	* DMA WRITEs are disabled by default (see #define below);
	*
	* DMA is not enabled automatically for this chipset,
	* but can be turned on manually (with "hdparm -d1") at run time.
	*
	* I need volunteers with "spare" drives for further testing
	* and development, and maybe to help figure out the peculiarities.
	* Even knowing the registers (below), some things behave strangely.
	*/

	#define TRM290_NO_DMA_WRITES /* DMA writes seem unreliable sometimes */

	/*
	* TRM-290 PCI-IDE2 Bus Master Chip
	* ================================
	* The configuration registers are addressed in normal I/O port space
	* and are used as follows:
	*
	* trm290_base depends on jumper settings, and is probed for by ide-dma.c
	*
	* trm290_base+2 when WRITTEN: chiptest register (byte, write-only)
	* bit7 must always be written as "1"
	* bits6-2 undefined
	* bit1 1=legacy_compatible_mode, 0=native_pci_mode
	* bit0 1=test_mode, 0=normal(default)
	*
	* trm290_base+2 when READ: status register (byte, read-only)
	* bits7-2 undefined
	* bit1 channel0 busmaster interrupt status 0=none, 1=asserted
	* bit0 channel0 interrupt status 0=none, 1=asserted
	*
	* trm290_base+3 Interrupt mask register
	* bits7-5 undefined
	* bit4 legacy_header: 1=present, 0=absent
	* bit3 channel1 busmaster interrupt status 0=none, 1=asserted (read only)
	* bit2 channel1 interrupt status 0=none, 1=asserted (read only)
	* bit1 channel1 interrupt mask: 1=masked, 0=unmasked(default)
	* bit0 channel0 interrupt mask: 1=masked, 0=unmasked(default)
	*
	* trm290_base+1 "CPR" Config Pointer Register (byte)
	* bit7 1=autoincrement CPR bits 2-0 after each access of CDR
	* bit6 1=min. 1 wait-state posted write cycle (default), 0=0 wait-state
	* bit5 0=enabled master burst access (default), 1=disable (write only)
	* bit4 PCI DEVSEL# timing select: 1=medium(default), 0=fast
	* bit3 0=primary IDE channel, 1=secondary IDE channel
	* bits2-0 register index for accesses through CDR port
	*
	* trm290_base+0 "CDR" Config Data Register (word)
	* two sets of seven config registers,
	* selected by CPR bit 3 (channel) and CPR bits 2-0 (index 0 to 6),
	* each index defined below:
	*
	* Index-0 Base address register for command block (word)
	* defaults: 0x1f0 for primary, 0x170 for secondary
	*
	* Index-1 general config register (byte)
	* bit7 1=DMA enable, 0=DMA disable
	* bit6 1=activate IDE_RESET, 0=no action (default)
	* bit5 1=enable IORDY, 0=disable IORDY (default)
	* bit4 0=16-bit data port(default), 1=8-bit (XT) data port
	* bit3 interrupt polarity: 1=active_low, 0=active_high(default)
	* bit2 power-saving-mode(?): 1=enable, 0=disable(default) (write only)
	* bit1 bus_master_mode(?): 1=enable, 0=disable(default)
	* bit0 enable_io_ports: 1=enable(default), 0=disable
	*
	* Index-2 read-ahead counter preload bits 0-7 (byte, write only)
	* bits7-0 bits7-0 of readahead count
	*
	* Index-3 read-ahead config register (byte, write only)
	* bit7 1=enable_readahead, 0=disable_readahead(default)
	* bit6 1=clear_FIFO, 0=no_action
	* bit5 undefined
	* bit4 mode4 timing control: 1=enable, 0=disable(default)
	* bit3 undefined
	* bit2 undefined
	* bits1-0 bits9-8 of read-ahead count
	*
	* Index-4 base address register for control block (word)
	* defaults: 0x3f6 for primary, 0x376 for secondary
	*
	* Index-5 data port timings (shared by both drives) (byte)
	* standard PCI "clk" (clock) counts, default value = 0xf5
	*
	* bits7-6 setup time: 00=1clk, 01=2clk, 10=3clk, 11=4clk
	* bits5-3 hold time: 000=1clk, 001=2clk, 010=3clk,
	* 011=4clk, 100=5clk, 101=6clk,
	* 110=8clk, 111=12clk
	* bits2-0 active time: 000=2clk, 001=3clk, 010=4clk,
	* 011=5clk, 100=6clk, 101=8clk,
	* 110=12clk, 111=16clk
	*
	* Index-6 command/control port timings (shared by both drives) (byte)
	* same layout as Index-5, default value = 0xde
	*
	* Suggested CDR programming for PIO mode0 (600ns):
	* 0x01f0,0x21,0xff,0x80,0x03f6,0xf5,0xde ; primary
	* 0x0170,0x21,0xff,0x80,0x0376,0xf5,0xde ; secondary
	*
	* Suggested CDR programming for PIO mode3 (180ns):
	* 0x01f0,0x21,0xff,0x80,0x03f6,0x09,0xde ; primary
	* 0x0170,0x21,0xff,0x80,0x0376,0x09,0xde ; secondary
	*
	* Suggested CDR programming for PIO mode4 (120ns):
	* 0x01f0,0x21,0xff,0x80,0x03f6,0x00,0xde ; primary
	* 0x0170,0x21,0xff,0x80,0x0376,0x00,0xde ; secondary
	*
	*/

	#include <linux/types.h>
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/mm.h>
	#include <linux/ioport.h>
	#include <linux/interrupt.h>
	#include <linux/blkdev.h>
	#include <linux/init.h>
	#include <linux/hdreg.h>
	#include <linux/pci.h>
	#include <linux/delay.h>
	#include <linux/ide.h>

	#include <asm/io.h>

	static void trm290_prepare_drive (ide_drive_t *drive, unsigned int use_dma)
	{
	ide_hwif_t *hwif = HWIF(drive);
	u16 reg = 0;
	unsigned long flags;

	/* select PIO or DMA */
	reg = use_dma ? (0x21 \| 0x82) : (0x21 & ~0x82);

	local_irq_save(flags);

	if (reg != hwif->select_data) {
	hwif->select_data = reg;
	/* set PIO/DMA */
	outb(0x51 \| (hwif->channel << 3), hwif->config_data + 1);
	outw(reg & 0xff, hwif->config_data);
	}

	/* enable IRQ if not probing */
	if (drive->present) {
	reg = inw(hwif->config_data + 3);
	reg &= 0x13;
	reg &= ~(1 << hwif->channel);
	outw(reg, hwif->config_data + 3);
	}

	local_irq_restore(flags);
	}

	static void trm290_selectproc (ide_drive_t *drive)
	{
	trm290_prepare_drive(drive, drive->using_dma);
	}

	static void trm290_dma_exec_cmd(ide_drive_t *drive, u8 command)
	{
	BUG_ON(HWGROUP(drive)->handler != NULL); /* paranoia check */
	ide_set_handler(drive, &ide_dma_intr, WAIT_CMD, NULL);
	/* issue cmd to drive */
	outb(command, IDE_COMMAND_REG);
	}

	static int trm290_dma_setup(ide_drive_t *drive)
	{
	ide_hwif_t *hwif = drive->hwif;
	struct request *rq = hwif->hwgroup->rq;
	unsigned int count, rw;

	if (rq_data_dir(rq)) {
	#ifdef TRM290_NO_DMA_WRITES
	/* always use PIO for writes */
	trm290_prepare_drive(drive, 0); /* select PIO xfer */
	return 1;
	#endif
	rw = 1;
	} else
	rw = 2;

	if (!(count = ide_build_dmatable(drive, rq))) {
	/* try PIO instead of DMA */
	trm290_prepare_drive(drive, 0); /* select PIO xfer */
	return 1;
	}
	/* select DMA xfer */
	trm290_prepare_drive(drive, 1);
	outl(hwif->dmatable_dma \| rw, hwif->dma_base);
	drive->waiting_for_dma = 1;
	/* start DMA */
	outw(count * 2 - 1, hwif->dma_base + 2);
	return 0;
	}

	static void trm290_dma_start(ide_drive_t *drive)
	{
	}

	static int trm290_ide_dma_end (ide_drive_t *drive)
	{
	u16 status;

	drive->waiting_for_dma = 0;
	/* purge DMA mappings */
	ide_destroy_dmatable(drive);
	status = inw(HWIF(drive)->dma_base + 2);
	return status != 0x00ff;
	}

	static int trm290_ide_dma_test_irq (ide_drive_t *drive)
	{
	u16 status;

	status = inw(HWIF(drive)->dma_base + 2);
	return status == 0x00ff;
	}

	static void trm290_dma_host_set(ide_drive_t *drive, int on)
	{
	}

	static void __devinit init_hwif_trm290(ide_hwif_t *hwif)
	{
	struct pci_dev *dev = to_pci_dev(hwif->dev);
	unsigned int cfg_base = pci_resource_start(dev, 4);
	unsigned long flags;
	u8 reg = 0;

	if ((dev->class & 5) && cfg_base)
	printk(KERN_INFO "TRM290: chip");
	else {
	cfg_base = 0x3df0;
	printk(KERN_INFO "TRM290: using default");
	}
	printk(KERN_CONT " config base at 0x%04x\n", cfg_base);
	hwif->config_data = cfg_base;
	hwif->dma_base = (cfg_base + 4) ^ (hwif->channel ? 0x80 : 0);

	printk(KERN_INFO " %s: BM-DMA at 0x%04lx-0x%04lx",
	hwif->name, hwif->dma_base, hwif->dma_base + 3);

	if (!request_region(hwif->dma_base, 4, hwif->name)) {
	printk(KERN_CONT " -- Error, ports in use.\n");
	return;
	}

	hwif->dmatable_cpu = pci_alloc_consistent(dev, PRD_ENTRIES * PRD_BYTES,
	&hwif->dmatable_dma);
	if (!hwif->dmatable_cpu) {
	printk(KERN_CONT " -- Error, unable to allocate DMA table.\n");
	release_region(hwif->dma_base, 4);
	return;
	}
	printk(KERN_CONT "\n");

	local_irq_save(flags);
	/* put config reg into first byte of hwif->select_data */
	outb(0x51 \| (hwif->channel << 3), hwif->config_data + 1);
	/* select PIO as default */
	hwif->select_data = 0x21;
	outb(hwif->select_data, hwif->config_data);
	/* get IRQ info */
	reg = inb(hwif->config_data + 3);
	/* mask IRQs for both ports */
	reg = (reg & 0x10) \| 0x03;
	outb(reg, hwif->config_data + 3);
	local_irq_restore(flags);

	if (reg & 0x10)
	/* legacy mode */
	hwif->irq = hwif->channel ? 15 : 14;
	else if (!hwif->irq && hwif->mate && hwif->mate->irq)
	/* sharing IRQ with mate */
	hwif->irq = hwif->mate->irq;

	hwif->dma_host_set = &trm290_dma_host_set;
	hwif->dma_setup = &trm290_dma_setup;
	hwif->dma_exec_cmd = &trm290_dma_exec_cmd;
	hwif->dma_start = &trm290_dma_start;
	hwif->ide_dma_end = &trm290_ide_dma_end;
	hwif->ide_dma_test_irq = &trm290_ide_dma_test_irq;

	hwif->selectproc = &trm290_selectproc;
	#if 1
	{
	/*
	* My trm290-based card doesn't seem to work with all possible values
	* for the control basereg, so this kludge ensures that we use only
	* values that are known to work. Ugh. -ml
	*/
	u16 new, old, compat = hwif->channel ? 0x374 : 0x3f4;
	static u16 next_offset = 0;
	u8 old_mask;

	outb(0x54 \| (hwif->channel << 3), hwif->config_data + 1);
	old = inw(hwif->config_data);
	old &= ~1;
	old_mask = inb(old + 2);
	if (old != compat && old_mask == 0xff) {
	/* leave lower 10 bits untouched */
	compat += (next_offset += 0x400);
	hwif->io_ports[IDE_CONTROL_OFFSET] = compat + 2;
	outw(compat \| 1, hwif->config_data);
	new = inw(hwif->config_data);
	printk(KERN_INFO "%s: control basereg workaround: "
	"old=0x%04x, new=0x%04x\n",
	hwif->name, old, new & ~1);
	}
	}
	#endif
	}

	static const struct ide_port_info trm290_chipset __devinitdata = {
	.name = "TRM290",
	.init_hwif = init_hwif_trm290,
	.chipset = ide_trm290,
	.host_flags = IDE_HFLAG_NO_ATAPI_DMA \|
	#if 0 /* play it safe for now */
	IDE_HFLAG_TRUST_BIOS_FOR_DMA \|
	#endif
	IDE_HFLAG_NO_AUTODMA \|
	IDE_HFLAG_BOOTABLE \|
	IDE_HFLAG_NO_LBA48,
	};

	static int __devinit trm290_init_one(struct pci_dev dev, const struct pci_device_id id)
	{
	return ide_setup_pci_device(dev, &trm290_chipset);
	}

	static const struct pci_device_id trm290_pci_tbl[] = {
	{ PCI_VDEVICE(TEKRAM, PCI_DEVICE_ID_TEKRAM_DC290), 0 },
	{ 0, },
	};
	MODULE_DEVICE_TABLE(pci, trm290_pci_tbl);

	static struct pci_driver driver = {
	.name = "TRM290_IDE",
	.id_table = trm290_pci_tbl,
	.probe = trm290_init_one,
	};

	static int __init trm290_ide_init(void)
	{
	return ide_pci_register_driver(&driver);
	}

	module_init(trm290_ide_init);

	MODULE_AUTHOR("Mark Lord");
	MODULE_DESCRIPTION("PCI driver module for Tekram TRM290 IDE");
	MODULE_LICENSE("GPL");