[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / ata / pata_rz1000.c

/*
 *  RZ1000/1001 driver based upon
 *
 *  linux/drivers/ide/pci/rz1000.c	Version 0.06	January 12, 2003
 *  Copyright (C) 1995-1998  Linus Torvalds & author (see below)
 *  Principal Author:  mlord@pobox.com (Mark Lord)
 *
 *  See linux/MAINTAINERS for address of current maintainer.
 *
 *  This file provides support for disabling the buggy read-ahead
 *  mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>

#define DRV_NAME	"pata_rz1000"
#define DRV_VERSION	"0.2.4"


/**
 *	rz1000_set_mode		-	mode setting function
 *	@link: ATA link
 *	@unused: returned device on set_mode failure
 *
 *	Use a non standard set_mode function. We don't want to be tuned. We
 *	would prefer to be BIOS generic but for the fact our hardware is
 *	whacked out.
 */

static int rz1000_set_mode(struct ata_link *link, struct ata_device **unused)
{
	struct ata_device *dev;

	ata_link_for_each_dev(dev, link) {
		if (ata_dev_enabled(dev)) {
			/* We don't really care */
			dev->pio_mode = XFER_PIO_0;
			dev->xfer_mode = XFER_PIO_0;
			dev->xfer_shift = ATA_SHIFT_PIO;
			dev->flags |= ATA_DFLAG_PIO;
			ata_dev_printk(dev, KERN_INFO, "configured for PIO\n");
		}
	}
	return 0;
}


static struct scsi_host_template rz1000_sht = {
	ATA_PIO_SHT(DRV_NAME),
};

static struct ata_port_operations rz1000_port_ops = {
	.inherits	= &ata_sff_port_ops,
	.cable_detect	= ata_cable_40wire,
	.set_mode	= rz1000_set_mode,
};

static int rz1000_fifo_disable(struct pci_dev *pdev)
{
	u16 reg;
	/* Be exceptionally paranoid as we must be sure to apply the fix */
	if (pci_read_config_word(pdev, 0x40, &reg) != 0)
		return -1;
	reg &= 0xDFFF;
	if (pci_write_config_word(pdev, 0x40, reg) != 0)
		return -1;
	printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
	return 0;
}

/**
 *	rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
 *	@pdev: PCI device to register
 *	@ent: Entry in rz1000_pci_tbl matching with @pdev
 *
 *	Configure an RZ1000 interface. This doesn't require much special
 *	handling except that we *MUST* kill the chipset readahead or the
 *	user may experience data corruption.
 */

static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
{
	static int printed_version;
	static const struct ata_port_info info = {
		.flags = ATA_FLAG_SLAVE_POSS,
		.pio_mask = 0x1f,
		.port_ops = &rz1000_port_ops
	};
	const struct ata_port_info *ppi[] = { &info, NULL };

	if (!printed_version++)
		printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");

	if (rz1000_fifo_disable(pdev) == 0)
		return ata_pci_sff_init_one(pdev, ppi, &rz1000_sht, NULL);

	printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
	/* Not safe to use so skip */
	return -ENODEV;
}

#ifdef CONFIG_PM
static int rz1000_reinit_one(struct pci_dev *pdev)
{
	/* If this fails on resume (which is a "cant happen" case), we
	   must stop as any progress risks data loss */
	if (rz1000_fifo_disable(pdev))
		panic("rz1000 fifo");
	return ata_pci_device_resume(pdev);
}
#endif

static const struct pci_device_id pata_rz1000[] = {
	{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
	{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },

	{ },
};

static struct pci_driver rz1000_pci_driver = {
	.name 		= DRV_NAME,
	.id_table	= pata_rz1000,
	.probe 		= rz1000_init_one,
	.remove		= ata_pci_remove_one,
#ifdef CONFIG_PM
	.suspend	= ata_pci_device_suspend,
	.resume		= rz1000_reinit_one,
#endif
};

static int __init rz1000_init(void)
{
	return pci_register_driver(&rz1000_pci_driver);
}

static void __exit rz1000_exit(void)
{
	pci_unregister_driver(&rz1000_pci_driver);
}

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, pata_rz1000);
MODULE_VERSION(DRV_VERSION);

module_init(rz1000_init);
module_exit(rz1000_exit);
Commit	Line	Data
669a5db4 JG	1	/*
	2	* RZ1000/1001 driver based upon
	3	*
	4	* linux/drivers/ide/pci/rz1000.c Version 0.06 January 12, 2003
	5	* Copyright (C) 1995-1998 Linus Torvalds & author (see below)
	6	* Principal Author: mlord@pobox.com (Mark Lord)
	7	*
	8	* See linux/MAINTAINERS for address of current maintainer.
	9	*
	10	* This file provides support for disabling the buggy read-ahead
	11	* mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
	12	*/
	13
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/pci.h>
	17	#include <linux/init.h>
	18	#include <linux/blkdev.h>
	19	#include <linux/delay.h>
	20	#include <scsi/scsi_host.h>
	21	#include <linux/libata.h>
	22
	23	#define DRV_NAME "pata_rz1000"
8bc3fc47	24	#define DRV_VERSION "0.2.4"
669a5db4 JG	25
669a5db4 JG	26
669a5db4 JG	27	/**
669a5db4 JG	28	* rz1000_set_mode - mode setting function
0260731f	29	* @link: ATA link
b229a7b0	30	* @unused: returned device on set_mode failure
669a5db4 JG	31	*
	32	* Use a non standard set_mode function. We don't want to be tuned. We
	33	* would prefer to be BIOS generic but for the fact our hardware is
	34	* whacked out.
	35	*/
	36
0260731f	37	static int rz1000_set_mode(struct ata_link link, struct ata_device *unused)
669a5db4	38	{
f58229f8	39	struct ata_device *dev;
669a5db4	40
0260731f	41	ata_link_for_each_dev(dev, link) {
9666f400	42	if (ata_dev_enabled(dev)) {
669a5db4 JG	43	/* We don't really care */
	44	dev->pio_mode = XFER_PIO_0;
	45	dev->xfer_mode = XFER_PIO_0;
	46	dev->xfer_shift = ATA_SHIFT_PIO;
	47	dev->flags \|= ATA_DFLAG_PIO;
e852f705	48	ata_dev_printk(dev, KERN_INFO, "configured for PIO\n");
669a5db4 JG	49	}
669a5db4 JG	50	}
b229a7b0	51	return 0;
669a5db4 JG	52	}
	53
	54
	55	static struct scsi_host_template rz1000_sht = {
68d1d07b	56	ATA_PIO_SHT(DRV_NAME),
669a5db4 JG	57	};
	58
	59	static struct ata_port_operations rz1000_port_ops = {
029cfd6b	60	.inherits = &ata_sff_port_ops,
2a25dfe4	61	.cable_detect = ata_cable_40wire,
029cfd6b	62	.set_mode = rz1000_set_mode,
669a5db4 JG	63	};
669a5db4 JG	64
ad4a42d2 AC	65	static int rz1000_fifo_disable(struct pci_dev *pdev)
	66	{
	67	u16 reg;
	68	/* Be exceptionally paranoid as we must be sure to apply the fix */
	69	if (pci_read_config_word(pdev, 0x40, &reg) != 0)
	70	return -1;
	71	reg &= 0xDFFF;
	72	if (pci_write_config_word(pdev, 0x40, reg) != 0)
	73	return -1;
	74	printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
	75	return 0;
	76	}
	77
669a5db4 JG	78	/**
	79	* rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
	80	* @pdev: PCI device to register
	81	* @ent: Entry in rz1000_pci_tbl matching with @pdev
	82	*
	83	* Configure an RZ1000 interface. This doesn't require much special
	84	* handling except that we MUST kill the chipset readahead or the
	85	* user may experience data corruption.
	86	*/
	87
	88	static int rz1000_init_one (struct pci_dev pdev, const struct pci_device_id ent)
	89	{
	90	static int printed_version;
1626aeb8	91	static const struct ata_port_info info = {
1d2808fd	92	.flags = ATA_FLAG_SLAVE_POSS,
669a5db4 JG	93	.pio_mask = 0x1f,
	94	.port_ops = &rz1000_port_ops
	95	};
1626aeb8	96	const struct ata_port_info *ppi[] = { &info, NULL };
669a5db4 JG	97
	98	if (!printed_version++)
	99	printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
	100
1626aeb8	101	if (rz1000_fifo_disable(pdev) == 0)
9363c382	102	return ata_pci_sff_init_one(pdev, ppi, &rz1000_sht, NULL);
1626aeb8	103
669a5db4 JG	104	printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
	105	/* Not safe to use so skip */
	106	return -ENODEV;
	107	}
	108
438ac6d5	109	#ifdef CONFIG_PM
ad4a42d2 AC	110	static int rz1000_reinit_one(struct pci_dev *pdev)
	111	{
	112	/* If this fails on resume (which is a "cant happen" case), we
	113	must stop as any progress risks data loss */
	114	if (rz1000_fifo_disable(pdev))
	115	panic("rz1000 fifo");
	116	return ata_pci_device_resume(pdev);
	117	}
438ac6d5	118	#endif
ad4a42d2	119
2d2744fc JG	120	static const struct pci_device_id pata_rz1000[] = {
	121	{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
	122	{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
	123
	124	{ },
669a5db4 JG	125	};
	126
	127	static struct pci_driver rz1000_pci_driver = {
2d2744fc	128	.name = DRV_NAME,
669a5db4 JG	129	.id_table = pata_rz1000,
669a5db4 JG	130	.probe = rz1000_init_one,
ad4a42d2	131	.remove = ata_pci_remove_one,
438ac6d5	132	#ifdef CONFIG_PM
ad4a42d2 AC	133	.suspend = ata_pci_device_suspend,
ad4a42d2 AC	134	.resume = rz1000_reinit_one,
438ac6d5	135	#endif
669a5db4 JG	136	};
669a5db4 JG	137
669a5db4 JG	138	static int __init rz1000_init(void)
	139	{
	140	return pci_register_driver(&rz1000_pci_driver);
	141	}
	142
	143	static void __exit rz1000_exit(void)
	144	{
	145	pci_unregister_driver(&rz1000_pci_driver);
	146	}
	147
	148	MODULE_AUTHOR("Alan Cox");
	149	MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
	150	MODULE_LICENSE("GPL");
	151	MODULE_DEVICE_TABLE(pci, pata_rz1000);
	152	MODULE_VERSION(DRV_VERSION);
	153
	154	module_init(rz1000_init);
	155	module_exit(rz1000_exit);
	156