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
8 static const char *udma_str[] =
9 { "UDMA/16", "UDMA/25", "UDMA/33", "UDMA/44",
10 "UDMA/66", "UDMA/100", "UDMA/133", "UDMA7" };
11 static const char *mwdma_str[] =
12 { "MWDMA0", "MWDMA1", "MWDMA2", "MWDMA3", "MWDMA4" };
13 static const char *swdma_str[] =
14 { "SWDMA0", "SWDMA1", "SWDMA2" };
15 static 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
ide_xfer_verbose(u8 mode)26 const 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 }
46 EXPORT_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
ide_get_best_pio_mode(ide_drive_t * drive,u8 mode_wanted,u8 max_mode)61 static 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
ide_pio_need_iordy(ide_drive_t * drive,const u8 pio)109 int 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 }
119 EXPORT_SYMBOL_GPL(ide_pio_need_iordy);
120
ide_set_pio_mode(ide_drive_t * drive,const u8 mode)121 int 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
ide_set_dma_mode(ide_drive_t * drive,const u8 mode)155 int 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 }
178 EXPORT_SYMBOL_GPL(ide_set_dma_mode);
179
180 /* req_pio == "255" for auto-tune */
ide_set_pio(ide_drive_t * drive,u8 req_pio)181 void 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 }
208 EXPORT_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
ide_rate_filter(ide_drive_t * drive,u8 speed)221 static 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
ide_set_xfer_rate(ide_drive_t * drive,u8 rate)248 int 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