[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / ide / dtc2278.c

/*
 *  Copyright (C) 1996  Linus Torvalds & author (see below)
 */

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

#include <asm/io.h>

#define DRV_NAME "dtc2278"

/*
 * Changing this #undef to #define may solve start up problems in some systems.
 */
#undef ALWAYS_SET_DTC2278_PIO_MODE

/*
 * From: andy@cercle.cts.com (Dyan Wile)
 *
 * Below is a patch for DTC-2278 - alike software-programmable controllers
 * The code enables the secondary IDE controller and the PIO4 (3?) timings on
 * the primary (EIDE). You may probably have to enable the 32-bit support to
 * get the full speed. You better get the disk interrupts disabled ( hdparm -u0
 * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
 * filesystem  corrupted with -u1, but under heavy disk load only :-)
 *
 * This card is now forced to use the "serialize" feature,
 * and irq-unmasking is disallowed.  If io_32bit is enabled,
 * it must be done for BOTH drives on each interface.
 *
 * This code was written for the DTC2278E, but might work with any of these:
 *
 * DTC2278S has only a single IDE interface.
 * DTC2278D has two IDE interfaces and is otherwise identical to the S version.
 * DTC2278E also has serial ports and a printer port
 * DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu>
 *
 * There may be a fourth controller type. The S and D versions use the
 * Winbond chip, and I think the E version does also.
 *
 */

static void sub22 (char b, char c)
{
	int i;

	for(i = 0; i < 3; ++i) {
		inb(0x3f6);
		outb_p(b,0xb0);
		inb(0x3f6);
		outb_p(c,0xb4);
		inb(0x3f6);
		if(inb(0xb4) == c) {
			outb_p(7,0xb0);
			inb(0x3f6);
			return;	/* success */
		}
	}
}

static DEFINE_SPINLOCK(dtc2278_lock);

static void dtc2278_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
	unsigned long flags;

	if (drive->pio_mode >= XFER_PIO_3) {
		spin_lock_irqsave(&dtc2278_lock, flags);
		/*
		 * This enables PIO mode4 (3?) on the first interface
		 */
		sub22(1,0xc3);
		sub22(0,0xa0);
		spin_unlock_irqrestore(&dtc2278_lock, flags);
	} else {
		/* we don't know how to set it back again.. */
		/* Actually we do - there is a data sheet available for the
		   Winbond but does anyone actually care */
	}
}

static const struct ide_port_ops dtc2278_port_ops = {
	.set_pio_mode		= dtc2278_set_pio_mode,
};

static const struct ide_port_info dtc2278_port_info __initconst = {
	.name			= DRV_NAME,
	.chipset		= ide_dtc2278,
	.port_ops		= &dtc2278_port_ops,
	.host_flags		= IDE_HFLAG_SERIALIZE |
				  IDE_HFLAG_NO_UNMASK_IRQS |
				  IDE_HFLAG_IO_32BIT |
				  /* disallow ->io_32bit changes */
				  IDE_HFLAG_NO_IO_32BIT |
				  IDE_HFLAG_NO_DMA |
				  IDE_HFLAG_DTC2278,
	.pio_mask		= ATA_PIO4,
};

static int __init dtc2278_probe(void)
{
	unsigned long flags;

	local_irq_save(flags);
	/*
	 * This enables the second interface
	 */
	outb_p(4,0xb0);
	inb(0x3f6);
	outb_p(0x20,0xb4);
	inb(0x3f6);
#ifdef ALWAYS_SET_DTC2278_PIO_MODE
	/*
	 * This enables PIO mode4 (3?) on the first interface
	 * and may solve start-up problems for some people.
	 */
	sub22(1,0xc3);
	sub22(0,0xa0);
#endif
	local_irq_restore(flags);

	return ide_legacy_device_add(&dtc2278_port_info, 0);
}

static bool probe_dtc2278;

module_param_named(probe, probe_dtc2278, bool, 0);
MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets");

static int __init dtc2278_init(void)
{
	if (probe_dtc2278 == 0)
		return -ENODEV;

	if (dtc2278_probe()) {
		printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
		return -EBUSY;
	}
	return 0;
}

module_init(dtc2278_init);

MODULE_AUTHOR("See Local File");
MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* Copyright (C) 1996 Linus Torvalds & author (see below)
	3	*/
	4
1da177e4	5	#include <linux/module.h>
1da177e4 LT	6	#include <linux/types.h>
	7	#include <linux/kernel.h>
	8	#include <linux/delay.h>
	9	#include <linux/timer.h>
	10	#include <linux/mm.h>
	11	#include <linux/ioport.h>
	12	#include <linux/blkdev.h>
1da177e4 LT	13	#include <linux/ide.h>
	14	#include <linux/init.h>
	15
	16	#include <asm/io.h>
	17
d92f1a28 BZ	18	#define DRV_NAME "dtc2278"
d92f1a28 BZ	19
1da177e4 LT	20	/*
	21	* Changing this #undef to #define may solve start up problems in some systems.
	22	*/
	23	#undef ALWAYS_SET_DTC2278_PIO_MODE
	24
	25	/*
	26	* From: andy@cercle.cts.com (Dyan Wile)
	27	*
	28	* Below is a patch for DTC-2278 - alike software-programmable controllers
	29	* The code enables the secondary IDE controller and the PIO4 (3?) timings on
	30	* the primary (EIDE). You may probably have to enable the 32-bit support to
	31	* get the full speed. You better get the disk interrupts disabled ( hdparm -u0
	32	* /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
	33	* filesystem corrupted with -u1, but under heavy disk load only :-)
	34	*
	35	* This card is now forced to use the "serialize" feature,
	36	* and irq-unmasking is disallowed. If io_32bit is enabled,
	37	* it must be done for BOTH drives on each interface.
	38	*
	39	* This code was written for the DTC2278E, but might work with any of these:
	40	*
	41	* DTC2278S has only a single IDE interface.
	42	* DTC2278D has two IDE interfaces and is otherwise identical to the S version.
	43	* DTC2278E also has serial ports and a printer port
	44	* DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu>
	45	*
	46	* There may be a fourth controller type. The S and D versions use the
	47	* Winbond chip, and I think the E version does also.
	48	*
	49	*/
	50
	51	static void sub22 (char b, char c)
	52	{
	53	int i;
	54
	55	for(i = 0; i < 3; ++i) {
	56	inb(0x3f6);
	57	outb_p(b,0xb0);
	58	inb(0x3f6);
	59	outb_p(c,0xb4);
	60	inb(0x3f6);
	61	if(inb(0xb4) == c) {
	62	outb_p(7,0xb0);
	63	inb(0x3f6);
	64	return; /* success */
	65	}
	66	}
	67	}
	68
a34a8751 BZ	69	static DEFINE_SPINLOCK(dtc2278_lock);
a34a8751 BZ	70
e085b3ca	71	static void dtc2278_set_pio_mode(ide_hwif_t hwif, ide_drive_t drive)
1da177e4 LT	72	{
	73	unsigned long flags;
	74
e085b3ca	75	if (drive->pio_mode >= XFER_PIO_3) {
a34a8751	76	spin_lock_irqsave(&dtc2278_lock, flags);
1da177e4 LT	77	/*
	78	* This enables PIO mode4 (3?) on the first interface
	79	*/
	80	sub22(1,0xc3);
	81	sub22(0,0xa0);
a34a8751	82	spin_unlock_irqrestore(&dtc2278_lock, flags);
1da177e4 LT	83	} else {
1da177e4 LT	84	/* we don't know how to set it back again.. */
d3bad45f AC	85	/* Actually we do - there is a data sheet available for the
d3bad45f AC	86	Winbond but does anyone actually care */
1da177e4	87	}
1da177e4 LT	88	}
1da177e4 LT	89
ac95beed BZ	90	static const struct ide_port_ops dtc2278_port_ops = {
	91	.set_pio_mode = dtc2278_set_pio_mode,
	92	};
	93
e6b53703	94	static const struct ide_port_info dtc2278_port_info __initconst = {
d92f1a28	95	.name = DRV_NAME,
c413b9b9	96	.chipset = ide_dtc2278,
ac95beed	97	.port_ops = &dtc2278_port_ops,
c413b9b9	98	.host_flags = IDE_HFLAG_SERIALIZE \|
807b90d0	99	IDE_HFLAG_NO_UNMASK_IRQS \|
c413b9b9	100	IDE_HFLAG_IO_32BIT \|
807b90d0 BZ	101	/* disallow ->io_32bit changes */
807b90d0 BZ	102	IDE_HFLAG_NO_IO_32BIT \|
2787cb8a BZ	103	IDE_HFLAG_NO_DMA \|
2787cb8a BZ	104	IDE_HFLAG_DTC2278,
c413b9b9 BZ	105	.pio_mask = ATA_PIO4,
	106	};
	107
84913882	108	static int __init dtc2278_probe(void)
1da177e4 LT	109	{
1da177e4 LT	110	unsigned long flags;
1da177e4	111
1da177e4 LT	112	local_irq_save(flags);
	113	/*
	114	* This enables the second interface
	115	*/
	116	outb_p(4,0xb0);
	117	inb(0x3f6);
	118	outb_p(0x20,0xb4);
	119	inb(0x3f6);
	120	#ifdef ALWAYS_SET_DTC2278_PIO_MODE
	121	/*
	122	* This enables PIO mode4 (3?) on the first interface
	123	* and may solve start-up problems for some people.
	124	*/
	125	sub22(1,0xc3);
	126	sub22(0,0xa0);
	127	#endif
	128	local_irq_restore(flags);
	129
0bfeee7d	130	return ide_legacy_device_add(&dtc2278_port_info, 0);
1da177e4 LT	131	}
1da177e4 LT	132
90ab5ee9	133	static bool probe_dtc2278;
84913882 BZ	134
	135	module_param_named(probe, probe_dtc2278, bool, 0);
	136	MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets");
	137
ade2daf9	138	static int __init dtc2278_init(void)
1da177e4	139	{
84913882 BZ	140	if (probe_dtc2278 == 0)
	141	return -ENODEV;
	142
	143	if (dtc2278_probe()) {
1da177e4 LT	144	printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
	145	return -EBUSY;
	146	}
	147	return 0;
	148	}
	149
1da177e4	150	module_init(dtc2278_init);
1da177e4 LT	151
	152	MODULE_AUTHOR("See Local File");
	153	MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
	154	MODULE_LICENSE("GPL");