1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright (C) 1995-1996 Linus Torvalds & author (see below) 4 */ 5 6/* 7 * Principal Author/Maintainer: PODIEN@hml2.atlas.de (Wolfram Podien) 8 * 9 * This file provides support for the advanced features 10 * of the UMC 8672 IDE interface. 11 * 12 * Version 0.01 Initial version, hacked out of ide.c, 13 * and #include'd rather than compiled separately. 14 * This will get cleaned up in a subsequent release. 15 * 16 * Version 0.02 now configs/compiles separate from ide.c -ml 17 * Version 0.03 enhanced auto-tune, fix display bug 18 * Version 0.05 replace sti() with restore_flags() -ml 19 * add detection of possible race condition -ml 20 */ 21 22/* 23 * VLB Controller Support from 24 * Wolfram Podien 25 * Rohoefe 3 26 * D28832 Achim 27 * Germany 28 * 29 * To enable UMC8672 support there must a lilo line like 30 * append="ide0=umc8672"... 31 * To set the speed according to the abilities of the hardware there must be a 32 * line like 33 * #define UMC_DRIVE0 11 34 * in the beginning of the driver, which sets the speed of drive 0 to 11 (there 35 * are some lines present). 0 - 11 are allowed speed values. These values are 36 * the results from the DOS speed test program supplied from UMC. 11 is the 37 * highest speed (about PIO mode 3) 38 */ 39#define REALLY_SLOW_IO /* some systems can safely undef this */ 40 41#include <linux/module.h> 42#include <linux/types.h> 43#include <linux/kernel.h> 44#include <linux/delay.h> 45#include <linux/timer.h> 46#include <linux/mm.h> 47#include <linux/ioport.h> 48#include <linux/blkdev.h> 49#include <linux/ide.h> 50#include <linux/init.h> 51 52#include <asm/io.h> 53 54#define DRV_NAME "umc8672" 55 56/* 57 * Default speeds. These can be changed with "auto-tune" and/or hdparm. 58 */ 59#define UMC_DRIVE0 1 /* DOS measured drive speeds */ 60#define UMC_DRIVE1 1 /* 0 to 11 allowed */ 61#define UMC_DRIVE2 1 /* 11 = Fastest Speed */ 62#define UMC_DRIVE3 1 /* In case of crash reduce speed */ 63 64static u8 current_speeds[4] = {UMC_DRIVE0, UMC_DRIVE1, UMC_DRIVE2, UMC_DRIVE3}; 65static const u8 pio_to_umc [5] = {0, 3, 7, 10, 11}; /* rough guesses */ 66 67/* 0 1 2 3 4 5 6 7 8 9 10 11 */ 68static const u8 speedtab [3][12] = { 69 {0x0f, 0x0b, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x1}, 70 {0x03, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x1}, 71 {0xff, 0xcb, 0xc0, 0x58, 0x36, 0x33, 0x23, 0x22, 0x21, 0x11, 0x10, 0x0} 72}; 73 74static void out_umc(char port, char wert) 75{ 76 outb_p(port, 0x108); 77 outb_p(wert, 0x109); 78} 79 80static inline u8 in_umc(char port) 81{ 82 outb_p(port, 0x108); 83 return inb_p(0x109); 84} 85 86static void umc_set_speeds(u8 speeds[]) 87{ 88 int i, tmp; 89 90 outb_p(0x5A, 0x108); /* enable umc */ 91 92 out_umc(0xd7, (speedtab[0][speeds[2]] | (speedtab[0][speeds[3]]<<4))); 93 out_umc(0xd6, (speedtab[0][speeds[0]] | (speedtab[0][speeds[1]]<<4))); 94 tmp = 0; 95 for (i = 3; i >= 0; i--) 96 tmp = (tmp << 2) | speedtab[1][speeds[i]]; 97 out_umc(0xdc, tmp); 98 for (i = 0; i < 4; i++) { 99 out_umc(0xd0 + i, speedtab[2][speeds[i]]); 100 out_umc(0xd8 + i, speedtab[2][speeds[i]]); 101 } 102 outb_p(0xa5, 0x108); /* disable umc */ 103 104 printk("umc8672: drive speeds [0 to 11]: %d %d %d %d\n", 105 speeds[0], speeds[1], speeds[2], speeds[3]); 106} 107 108static void umc_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive) 109{ 110 ide_hwif_t *mate = hwif->mate; 111 unsigned long flags; 112 const u8 pio = drive->pio_mode - XFER_PIO_0; 113 114 printk("%s: setting umc8672 to PIO mode%d (speed %d)\n", 115 drive->name, pio, pio_to_umc[pio]); 116 if (mate) 117 spin_lock_irqsave(&mate->lock, flags); 118 if (mate && mate->handler) { 119 printk(KERN_ERR "umc8672: other interface is busy: exiting tune_umc()\n"); 120 } else { 121 current_speeds[drive->name[2] - 'a'] = pio_to_umc[pio]; 122 umc_set_speeds(current_speeds); 123 } 124 if (mate) 125 spin_unlock_irqrestore(&mate->lock, flags); 126} 127 128static const struct ide_port_ops umc8672_port_ops = { 129 .set_pio_mode = umc_set_pio_mode, 130}; 131 132static const struct ide_port_info umc8672_port_info __initconst = { 133 .name = DRV_NAME, 134 .chipset = ide_umc8672, 135 .port_ops = &umc8672_port_ops, 136 .host_flags = IDE_HFLAG_NO_DMA, 137 .pio_mask = ATA_PIO4, 138}; 139 140static int __init umc8672_probe(void) 141{ 142 unsigned long flags; 143 144 if (!request_region(0x108, 2, "umc8672")) { 145 printk(KERN_ERR "umc8672: ports 0x108-0x109 already in use.\n"); 146 return 1; 147 } 148 local_irq_save(flags); 149 outb_p(0x5A, 0x108); /* enable umc */ 150 if (in_umc (0xd5) != 0xa0) { 151 local_irq_restore(flags); 152 printk(KERN_ERR "umc8672: not found\n"); 153 release_region(0x108, 2); 154 return 1; 155 } 156 outb_p(0xa5, 0x108); /* disable umc */ 157 158 umc_set_speeds(current_speeds); 159 local_irq_restore(flags); 160 161 return ide_legacy_device_add(&umc8672_port_info, 0); 162} 163 164static bool probe_umc8672; 165 166module_param_named(probe, probe_umc8672, bool, 0); 167MODULE_PARM_DESC(probe, "probe for UMC8672 chipset"); 168 169static int __init umc8672_init(void) 170{ 171 if (probe_umc8672 == 0) 172 goto out; 173 174 if (umc8672_probe() == 0) 175 return 0; 176out: 177 return -ENODEV; 178} 179 180module_init(umc8672_init); 181 182MODULE_AUTHOR("Wolfram Podien"); 183MODULE_DESCRIPTION("Support for UMC 8672 IDE chipset"); 184MODULE_LICENSE("GPL"); 185