1 // SPDX-License-Identifier: GPL-2.0-only
3  *  Copyright (C) 1995-1996  Linus Torvalds & authors (see below)
25  *  chrisc@dbass.demon.co.uk, dalecki@namu26.Num.Math.Uni-Goettingen.de,
26  *  derekn@vw.ece.cmu.edu, florian@btp2x3.phy.uni-bayreuth.de,
28  *  j@pobox.com, jkemp1@mises.uni-paderborn.de, jtoppe@hiwaay.net,
29  *  kerouac@ssnet.com, meskes@informatik.rwth-aachen.de, hzoli@cs.elte.hu,
45  *			with prefetch mode. Separate function for setting
52  *			Added new function cmd640_set_mode to set PIO mode
59  *  Version 0.07	Changed to more conservative drive tuning policy.
61  *			(reported_PIO - 1) if it is supported, or to PIO0.
79  *			prefetch can be turned OFF/ON using "hdparm -p8/-p9"
80  *			 (requires hdparm-3.1 or newer)
81  *  Version 0.91	first release to linux-kernel list.
90  *			other minor tune-ups:  0.96 was very good.
92  *  Version 0.99	display setup/active/recovery clocks with PIO mode
94  *  Version 1.01	slow/fast devsel can be selected with "hdparm -p6/-p7"
163  * Registers and masks for easy access by drive index:
174  * Current cmd640 timing values for each drive.
288  * Probe for CMD640x -- pci method 1
304  * Probe for CMD640x -- pci method 2
318  * Probe for CMD640x -- vlb
338  *  Returns 1 if an IDE interface/drive exists at 0x170,
380 static void __set_prefetch_mode(ide_drive_t *drive, int mode)  in __set_prefetch_mode()  argument
382 	if (mode) {	/* want prefetch on? */  in __set_prefetch_mode()
384 		drive->dev_flags |= IDE_DFLAG_NO_UNMASK;  in __set_prefetch_mode()
385 		drive->dev_flags &= ~IDE_DFLAG_UNMASK;  in __set_prefetch_mode()
387 		drive->dev_flags &= ~IDE_DFLAG_NO_IO_32BIT;  in __set_prefetch_mode()
389 		drive->dev_flags &= ~IDE_DFLAG_NO_UNMASK;  in __set_prefetch_mode()
390 		drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;  in __set_prefetch_mode()
391 		drive->io_32bit = 0;  in __set_prefetch_mode()
397  * Check whether prefetch is on for a drive,
400 static void __init check_prefetch(ide_drive_t *drive, unsigned int index)  in check_prefetch()  argument
404 	__set_prefetch_mode(drive, (b & prefetch_masks[index]) ? 0 : 1);  in check_prefetch()
409  * Sets prefetch mode for a drive.
411 static void set_prefetch_mode(ide_drive_t *drive, unsigned int index, int mode)  in set_prefetch_mode()  argument
419 	__set_prefetch_mode(drive, mode);  in set_prefetch_mode()
420 	if (mode)  in set_prefetch_mode()
429  * Dump out current drive clocks settings
457  * for a drive into the cmd640 chipset registers to active them.
459 static void program_drive_counts(ide_drive_t *drive, unsigned int index)  in program_drive_counts()  argument
467 	 * Set up address setup count and drive read/write timing registers.  in program_drive_counts()
469 	 * each drive.  Secondary interface has one common set of registers,  in program_drive_counts()
473 		ide_drive_t *peer = ide_get_pair_dev(drive);  in program_drive_counts()
504 	 * (this converts counts of 16 into counts of zero -- okay).  in program_drive_counts()
513  * Set a specific pio_mode for a drive
515 static void cmd640_set_mode(ide_drive_t *drive, unsigned int index,  in cmd640_set_mode()  argument
532 	setup_time  = t->setup;  in cmd640_set_mode()
533 	active_time = t->active;  in cmd640_set_mode()
535 	recovery_time = cycle_time - (setup_time + active_time);  in cmd640_set_mode()
546 	recovery_count2 = cycle_count - (setup_count + active_count);  in cmd640_set_mode()
552 		active_count += recovery_count - 17;  in cmd640_set_mode()
558 		recovery_count -= 1;  /* cmd640b uses (count + 1)*/  in cmd640_set_mode()
567 	 * In a perfect world, we might set the drive pio mode here  in cmd640_set_mode()
574 	program_drive_counts(drive, index);  in cmd640_set_mode()
577 static void cmd640_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)  in cmd640_set_pio_mode()  argument
580 	const u8 pio = drive->pio_mode - XFER_PIO_0;  in cmd640_set_pio_mode()
584 	case 6: /* set fast-devsel off */  in cmd640_set_pio_mode()
585 	case 7: /* set fast-devsel on */  in cmd640_set_pio_mode()
591 			drive->name, (pio & 1) ? "en" : "dis");  in cmd640_set_pio_mode()
595 		set_prefetch_mode(drive, index, pio & 1);  in cmd640_set_pio_mode()
597 			drive->name, (pio & 1) ? "en" : "dis");  in cmd640_set_pio_mode()
601 	cycle_time = ide_pio_cycle_time(drive, pio);  in cmd640_set_pio_mode()
602 	cmd640_set_mode(drive, index, pio, cycle_time);  in cmd640_set_pio_mode()
604 	printk("%s: selected cmd640 PIO mode%d (%dns)",  in cmd640_set_pio_mode()
605 		drive->name, pio, cycle_time);  in cmd640_set_pio_mode()
611 static void __init cmd640_init_dev(ide_drive_t *drive)  in cmd640_init_dev()  argument
613 	unsigned int i = drive->hwif->channel * 2 + (drive->dn & 1);  in cmd640_init_dev()
618 	 * This way, the drive identify code has a better chance.  in cmd640_init_dev()
623 	program_drive_counts(drive, i);  in cmd640_init_dev()
624 	set_prefetch_mode(drive, i, 0);  in cmd640_init_dev()
625 	printk(KERN_INFO DRV_NAME ": drive%d timings/prefetch cleared\n", i);  in cmd640_init_dev()
628 	 * Set the drive unmask flags to match the prefetch setting.  in cmd640_init_dev()
630 	check_prefetch(drive, i);  in cmd640_init_dev()
631 	printk(KERN_INFO DRV_NAME ": drive%d timings/prefetch(%s) preserved\n",  in cmd640_init_dev()
632 		i, (drive->dev_flags & IDE_DFLAG_NO_IO_32BIT) ? "off" : "on");  in cmd640_init_dev()
638 	int irq_reg		= hwif->channel ? ARTTIM23 : CFR;  in cmd640_test_irq()
639 	u8  irq_mask		= hwif->channel ? ARTTIM23_IDE23INTR :  in cmd640_test_irq()
702 		printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",  in cmd640x_init_one()
704 		return -EBUSY;  in cmd640x_init_one()
711 		return -EBUSY;  in cmd640x_init_one()
784 			 "\n", 'a' + cmd640_chip_version - 1, bus_type, cfr);  in cmd640x_init()
793 	 * for access to the drive's command register block,  in cmd640x_init()