1#include <linux/types.h> 2#include <linux/string.h> 3#include <linux/kernel.h> 4#include <linux/interrupt.h> 5#include <linux/ide.h> 6#include <linux/bitops.h> 7 8static const char *udma_str[] = 9 { "UDMA/16", "UDMA/25", "UDMA/33", "UDMA/44", 10 "UDMA/66", "UDMA/100", "UDMA/133", "UDMA7" }; 11static const char *mwdma_str[] = 12 { "MWDMA0", "MWDMA1", "MWDMA2", "MWDMA3", "MWDMA4" }; 13static const char *swdma_str[] = 14 { "SWDMA0", "SWDMA1", "SWDMA2" }; 15static const char *pio_str[] = 16 { "PIO0", "PIO1", "PIO2", "PIO3", "PIO4", "PIO5", "PIO6" }; 17 18/** 19 * ide_xfer_verbose - return IDE mode names 20 * @mode: transfer mode 21 * 22 * Returns a constant string giving the name of the mode 23 * requested. 24 */ 25 26const char *ide_xfer_verbose(u8 mode) 27{ 28 const char *s; 29 u8 i = mode & 0xf; 30 31 if (mode >= XFER_UDMA_0 && mode <= XFER_UDMA_7) 32 s = udma_str[i]; 33 else if (mode >= XFER_MW_DMA_0 && mode <= XFER_MW_DMA_4) 34 s = mwdma_str[i]; 35 else if (mode >= XFER_SW_DMA_0 && mode <= XFER_SW_DMA_2) 36 s = swdma_str[i]; 37 else if (mode >= XFER_PIO_0 && mode <= XFER_PIO_6) 38 s = pio_str[i & 0x7]; 39 else if (mode == XFER_PIO_SLOW) 40 s = "PIO SLOW"; 41 else 42 s = "XFER ERROR"; 43 44 return s; 45} 46EXPORT_SYMBOL(ide_xfer_verbose); 47 48/** 49 * ide_get_best_pio_mode - get PIO mode from drive 50 * @drive: drive to consider 51 * @mode_wanted: preferred mode 52 * @max_mode: highest allowed mode 53 * 54 * This routine returns the recommended PIO settings for a given drive, 55 * based on the drive->id information and the ide_pio_blacklist[]. 56 * 57 * Drive PIO mode is auto-selected if 255 is passed as mode_wanted. 58 * This is used by most chipset support modules when "auto-tuning". 59 */ 60 61static u8 ide_get_best_pio_mode(ide_drive_t *drive, u8 mode_wanted, u8 max_mode) 62{ 63 u16 *id = drive->id; 64 int pio_mode = -1, overridden = 0; 65 66 if (mode_wanted != 255) 67 return min_t(u8, mode_wanted, max_mode); 68 69 if ((drive->hwif->host_flags & IDE_HFLAG_PIO_NO_BLACKLIST) == 0) 70 pio_mode = ide_scan_pio_blacklist((char *)&id[ATA_ID_PROD]); 71 72 if (pio_mode != -1) { 73 printk(KERN_INFO "%s: is on PIO blacklist\n", drive->name); 74 } else { 75 pio_mode = id[ATA_ID_OLD_PIO_MODES] >> 8; 76 if (pio_mode > 2) { /* 2 is maximum allowed tPIO value */ 77 pio_mode = 2; 78 overridden = 1; 79 } 80 81 if (id[ATA_ID_FIELD_VALID] & 2) { /* ATA2? */ 82 if (ata_id_is_cfa(id) && (id[ATA_ID_CFA_MODES] & 7)) 83 pio_mode = 4 + min_t(int, 2, 84 id[ATA_ID_CFA_MODES] & 7); 85 else if (ata_id_has_iordy(id)) { 86 if (id[ATA_ID_PIO_MODES] & 7) { 87 overridden = 0; 88 if (id[ATA_ID_PIO_MODES] & 4) 89 pio_mode = 5; 90 else if (id[ATA_ID_PIO_MODES] & 2) 91 pio_mode = 4; 92 else 93 pio_mode = 3; 94 } 95 } 96 } 97 98 if (overridden) 99 printk(KERN_INFO "%s: tPIO > 2, assuming tPIO = 2\n", 100 drive->name); 101 } 102 103 if (pio_mode > max_mode) 104 pio_mode = max_mode; 105 106 return pio_mode; 107} 108 109int ide_pio_need_iordy(ide_drive_t *drive, const u8 pio) 110{ 111 /* 112 * IORDY may lead to controller lock up on certain controllers 113 * if the port is not occupied. 114 */ 115 if (pio == 0 && (drive->hwif->port_flags & IDE_PFLAG_PROBING)) 116 return 0; 117 return ata_id_pio_need_iordy(drive->id, pio); 118} 119EXPORT_SYMBOL_GPL(ide_pio_need_iordy); 120 121int ide_set_pio_mode(ide_drive_t *drive, const u8 mode) 122{ 123 ide_hwif_t *hwif = drive->hwif; 124 const struct ide_port_ops *port_ops = hwif->port_ops; 125 126 if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE) 127 return 0; 128 129 if (port_ops == NULL || port_ops->set_pio_mode == NULL) 130 return -1; 131 132 /* 133 * TODO: temporary hack for some legacy host drivers that didn't 134 * set transfer mode on the device in ->set_pio_mode method... 135 */ 136 if (port_ops->set_dma_mode == NULL) { 137 drive->pio_mode = mode; 138 port_ops->set_pio_mode(hwif, drive); 139 return 0; 140 } 141 142 if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) { 143 if (ide_config_drive_speed(drive, mode)) 144 return -1; 145 drive->pio_mode = mode; 146 port_ops->set_pio_mode(hwif, drive); 147 return 0; 148 } else { 149 drive->pio_mode = mode; 150 port_ops->set_pio_mode(hwif, drive); 151 return ide_config_drive_speed(drive, mode); 152 } 153} 154 155int ide_set_dma_mode(ide_drive_t *drive, const u8 mode) 156{ 157 ide_hwif_t *hwif = drive->hwif; 158 const struct ide_port_ops *port_ops = hwif->port_ops; 159 160 if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE) 161 return 0; 162 163 if (port_ops == NULL || port_ops->set_dma_mode == NULL) 164 return -1; 165 166 if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) { 167 if (ide_config_drive_speed(drive, mode)) 168 return -1; 169 drive->dma_mode = mode; 170 port_ops->set_dma_mode(hwif, drive); 171 return 0; 172 } else { 173 drive->dma_mode = mode; 174 port_ops->set_dma_mode(hwif, drive); 175 return ide_config_drive_speed(drive, mode); 176 } 177} 178EXPORT_SYMBOL_GPL(ide_set_dma_mode); 179 180/* req_pio == "255" for auto-tune */ 181void ide_set_pio(ide_drive_t *drive, u8 req_pio) 182{ 183 ide_hwif_t *hwif = drive->hwif; 184 const struct ide_port_ops *port_ops = hwif->port_ops; 185 u8 host_pio, pio; 186 187 if (port_ops == NULL || port_ops->set_pio_mode == NULL || 188 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)) 189 return; 190 191 BUG_ON(hwif->pio_mask == 0x00); 192 193 host_pio = fls(hwif->pio_mask) - 1; 194 195 pio = ide_get_best_pio_mode(drive, req_pio, host_pio); 196 197 /* 198 * TODO: 199 * - report device max PIO mode 200 * - check req_pio != 255 against device max PIO mode 201 */ 202 printk(KERN_DEBUG "%s: host max PIO%d wanted PIO%d%s selected PIO%d\n", 203 drive->name, host_pio, req_pio, 204 req_pio == 255 ? "(auto-tune)" : "", pio); 205 206 (void)ide_set_pio_mode(drive, XFER_PIO_0 + pio); 207} 208EXPORT_SYMBOL_GPL(ide_set_pio); 209 210/** 211 * ide_rate_filter - filter transfer mode 212 * @drive: IDE device 213 * @speed: desired speed 214 * 215 * Given the available transfer modes this function returns 216 * the best available speed at or below the speed requested. 217 * 218 * TODO: check device PIO capabilities 219 */ 220 221static u8 ide_rate_filter(ide_drive_t *drive, u8 speed) 222{ 223 ide_hwif_t *hwif = drive->hwif; 224 u8 mode = ide_find_dma_mode(drive, speed); 225 226 if (mode == 0) { 227 if (hwif->pio_mask) 228 mode = fls(hwif->pio_mask) - 1 + XFER_PIO_0; 229 else 230 mode = XFER_PIO_4; 231 } 232 233/* printk("%s: mode 0x%02x, speed 0x%02x\n", __func__, mode, speed); */ 234 235 return min(speed, mode); 236} 237 238/** 239 * ide_set_xfer_rate - set transfer rate 240 * @drive: drive to set 241 * @rate: speed to attempt to set 242 * 243 * General helper for setting the speed of an IDE device. This 244 * function knows about user enforced limits from the configuration 245 * which ->set_pio_mode/->set_dma_mode does not. 246 */ 247 248int ide_set_xfer_rate(ide_drive_t *drive, u8 rate) 249{ 250 ide_hwif_t *hwif = drive->hwif; 251 const struct ide_port_ops *port_ops = hwif->port_ops; 252 253 if (port_ops == NULL || port_ops->set_dma_mode == NULL || 254 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)) 255 return -1; 256 257 rate = ide_rate_filter(drive, rate); 258 259 BUG_ON(rate < XFER_PIO_0); 260 261 if (rate >= XFER_PIO_0 && rate <= XFER_PIO_6) 262 return ide_set_pio_mode(drive, rate); 263 264 return ide_set_dma_mode(drive, rate); 265} 266