1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright (C) 1996 Linus Torvalds & author (see below) 4 */ 5 6/* 7 * ALI M14xx chipset EIDE controller 8 * 9 * Works for ALI M1439/1443/1445/1487/1489 chipsets. 10 * 11 * Adapted from code developed by derekn@vw.ece.cmu.edu. -ml 12 * Derek's notes follow: 13 * 14 * I think the code should be pretty understandable, 15 * but I'll be happy to (try to) answer questions. 16 * 17 * The critical part is in the setupDrive function. The initRegisters 18 * function doesn't seem to be necessary, but the DOS driver does it, so 19 * I threw it in. 20 * 21 * I've only tested this on my system, which only has one disk. I posted 22 * it to comp.sys.linux.hardware, so maybe some other people will try it 23 * out. 24 * 25 * Derek Noonburg (derekn@ece.cmu.edu) 26 * 95-sep-26 27 * 28 * Update 96-jul-13: 29 * 30 * I've since upgraded to two disks and a CD-ROM, with no trouble, and 31 * I've also heard from several others who have used it successfully. 32 * This driver appears to work with both the 1443/1445 and the 1487/1489 33 * chipsets. I've added support for PIO mode 4 for the 1487. This 34 * seems to work just fine on the 1443 also, although I'm not sure it's 35 * advertised as supporting mode 4. (I've been running a WDC AC21200 in 36 * mode 4 for a while now with no trouble.) -Derek 37 */ 38 39#include <linux/module.h> 40#include <linux/types.h> 41#include <linux/kernel.h> 42#include <linux/delay.h> 43#include <linux/timer.h> 44#include <linux/mm.h> 45#include <linux/ioport.h> 46#include <linux/blkdev.h> 47#include <linux/ide.h> 48#include <linux/init.h> 49 50#include <asm/io.h> 51 52#define DRV_NAME "ali14xx" 53 54/* port addresses for auto-detection */ 55#define ALI_NUM_PORTS 4 56static const int ports[ALI_NUM_PORTS] __initconst = 57 { 0x074, 0x0f4, 0x034, 0x0e4 }; 58 59/* register initialization data */ 60typedef struct { u8 reg, data; } RegInitializer; 61 62static const RegInitializer initData[] __initconst = { 63 {0x01, 0x0f}, {0x02, 0x00}, {0x03, 0x00}, {0x04, 0x00}, 64 {0x05, 0x00}, {0x06, 0x00}, {0x07, 0x2b}, {0x0a, 0x0f}, 65 {0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00}, {0x28, 0x00}, 66 {0x29, 0x00}, {0x2a, 0x00}, {0x2f, 0x00}, {0x2b, 0x00}, 67 {0x2c, 0x00}, {0x2d, 0x00}, {0x2e, 0x00}, {0x30, 0x00}, 68 {0x31, 0x00}, {0x32, 0x00}, {0x33, 0x00}, {0x34, 0xff}, 69 {0x35, 0x03}, {0x00, 0x00} 70}; 71 72/* timing parameter registers for each drive */ 73static struct { u8 reg1, reg2, reg3, reg4; } regTab[4] = { 74 {0x03, 0x26, 0x04, 0x27}, /* drive 0 */ 75 {0x05, 0x28, 0x06, 0x29}, /* drive 1 */ 76 {0x2b, 0x30, 0x2c, 0x31}, /* drive 2 */ 77 {0x2d, 0x32, 0x2e, 0x33}, /* drive 3 */ 78}; 79 80static int basePort; /* base port address */ 81static int regPort; /* port for register number */ 82static int dataPort; /* port for register data */ 83static u8 regOn; /* output to base port to access registers */ 84static u8 regOff; /* output to base port to close registers */ 85 86/*------------------------------------------------------------------------*/ 87 88/* 89 * Read a controller register. 90 */ 91static inline u8 inReg(u8 reg) 92{ 93 outb_p(reg, regPort); 94 return inb(dataPort); 95} 96 97/* 98 * Write a controller register. 99 */ 100static void outReg(u8 data, u8 reg) 101{ 102 outb_p(reg, regPort); 103 outb_p(data, dataPort); 104} 105 106static DEFINE_SPINLOCK(ali14xx_lock); 107 108/* 109 * Set PIO mode for the specified drive. 110 * This function computes timing parameters 111 * and sets controller registers accordingly. 112 */ 113static void ali14xx_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive) 114{ 115 int driveNum; 116 int time1, time2; 117 u8 param1, param2, param3, param4; 118 unsigned long flags; 119 int bus_speed = ide_vlb_clk ? ide_vlb_clk : 50; 120 const u8 pio = drive->pio_mode - XFER_PIO_0; 121 struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio); 122 123 /* calculate timing, according to PIO mode */ 124 time1 = ide_pio_cycle_time(drive, pio); 125 time2 = t->active; 126 param3 = param1 = (time2 * bus_speed + 999) / 1000; 127 param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1; 128 if (pio < 3) { 129 param3 += 8; 130 param4 += 8; 131 } 132 printk(KERN_DEBUG "%s: PIO mode%d, t1=%dns, t2=%dns, cycles = %d+%d, %d+%d\n", 133 drive->name, pio, time1, time2, param1, param2, param3, param4); 134 135 /* stuff timing parameters into controller registers */ 136 driveNum = (drive->hwif->index << 1) + (drive->dn & 1); 137 spin_lock_irqsave(&ali14xx_lock, flags); 138 outb_p(regOn, basePort); 139 outReg(param1, regTab[driveNum].reg1); 140 outReg(param2, regTab[driveNum].reg2); 141 outReg(param3, regTab[driveNum].reg3); 142 outReg(param4, regTab[driveNum].reg4); 143 outb_p(regOff, basePort); 144 spin_unlock_irqrestore(&ali14xx_lock, flags); 145} 146 147/* 148 * Auto-detect the IDE controller port. 149 */ 150static int __init findPort(void) 151{ 152 int i; 153 u8 t; 154 unsigned long flags; 155 156 local_irq_save(flags); 157 for (i = 0; i < ALI_NUM_PORTS; ++i) { 158 basePort = ports[i]; 159 regOff = inb(basePort); 160 for (regOn = 0x30; regOn <= 0x33; ++regOn) { 161 outb_p(regOn, basePort); 162 if (inb(basePort) == regOn) { 163 regPort = basePort + 4; 164 dataPort = basePort + 8; 165 t = inReg(0) & 0xf0; 166 outb_p(regOff, basePort); 167 local_irq_restore(flags); 168 if (t != 0x50) 169 return 0; 170 return 1; /* success */ 171 } 172 } 173 outb_p(regOff, basePort); 174 } 175 local_irq_restore(flags); 176 return 0; 177} 178 179/* 180 * Initialize controller registers with default values. 181 */ 182static int __init initRegisters(void) 183{ 184 const RegInitializer *p; 185 u8 t; 186 unsigned long flags; 187 188 local_irq_save(flags); 189 outb_p(regOn, basePort); 190 for (p = initData; p->reg != 0; ++p) 191 outReg(p->data, p->reg); 192 outb_p(0x01, regPort); 193 t = inb(regPort) & 0x01; 194 outb_p(regOff, basePort); 195 local_irq_restore(flags); 196 return t; 197} 198 199static const struct ide_port_ops ali14xx_port_ops = { 200 .set_pio_mode = ali14xx_set_pio_mode, 201}; 202 203static const struct ide_port_info ali14xx_port_info = { 204 .name = DRV_NAME, 205 .chipset = ide_ali14xx, 206 .port_ops = &ali14xx_port_ops, 207 .host_flags = IDE_HFLAG_NO_DMA, 208 .pio_mask = ATA_PIO4, 209}; 210 211static int __init ali14xx_probe(void) 212{ 213 printk(KERN_DEBUG "ali14xx: base=0x%03x, regOn=0x%02x.\n", 214 basePort, regOn); 215 216 /* initialize controller registers */ 217 if (!initRegisters()) { 218 printk(KERN_ERR "ali14xx: Chip initialization failed.\n"); 219 return 1; 220 } 221 222 return ide_legacy_device_add(&ali14xx_port_info, 0); 223} 224 225static bool probe_ali14xx; 226 227module_param_named(probe, probe_ali14xx, bool, 0); 228MODULE_PARM_DESC(probe, "probe for ALI M14xx chipsets"); 229 230static int __init ali14xx_init(void) 231{ 232 if (probe_ali14xx == 0) 233 goto out; 234 235 /* auto-detect IDE controller port */ 236 if (findPort()) { 237 if (ali14xx_probe()) 238 return -ENODEV; 239 return 0; 240 } 241 printk(KERN_ERR "ali14xx: not found.\n"); 242out: 243 return -ENODEV; 244} 245 246module_init(ali14xx_init); 247 248MODULE_AUTHOR("see local file"); 249MODULE_DESCRIPTION("support of ALI 14XX IDE chipsets"); 250MODULE_LICENSE("GPL"); 251