diff options
Diffstat (limited to 'drivers/ide/dtc2278.c')
| -rw-r--r-- | drivers/ide/dtc2278.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/drivers/ide/dtc2278.c b/drivers/ide/dtc2278.c new file mode 100644 index 00000000000..689b2e49341 --- /dev/null +++ b/drivers/ide/dtc2278.c @@ -0,0 +1,153 @@ +/* + * 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_drive_t *drive, const u8 pio) +{ + unsigned long flags; + + if (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 __initdata = { + .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, + .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 int 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"); |