1 #include <linux/types.h>
2 #include <linux/string.h>
3 #include <linux/kernel.h>
4 #include <linux/export.h>
5 #include <linux/interrupt.h>
6 #include <linux/ide.h>
7 #include <linux/bitops.h>
8
9 static const char *udma_str[] =
10 { "UDMA/16", "UDMA/25", "UDMA/33", "UDMA/44",
11 "UDMA/66", "UDMA/100", "UDMA/133", "UDMA7" };
12 static const char *mwdma_str[] =
13 { "MWDMA0", "MWDMA1", "MWDMA2", "MWDMA3", "MWDMA4" };
14 static const char *swdma_str[] =
15 { "SWDMA0", "SWDMA1", "SWDMA2" };
16 static const char *pio_str[] =
17 { "PIO0", "PIO1", "PIO2", "PIO3", "PIO4", "PIO5", "PIO6" };
18
19 /**
20 * ide_xfer_verbose - return IDE mode names
21 * @mode: transfer mode
22 *
23 * Returns a constant string giving the name of the mode
24 * requested.
25 */
26
ide_xfer_verbose(u8 mode)27 const char *ide_xfer_verbose(u8 mode)
28 {
29 const char *s;
30 u8 i = mode & 0xf;
31
32 if (mode >= XFER_UDMA_0 && mode <= XFER_UDMA_7)
33 s = udma_str[i];
34 else if (mode >= XFER_MW_DMA_0 && mode <= XFER_MW_DMA_4)
35 s = mwdma_str[i];
36 else if (mode >= XFER_SW_DMA_0 && mode <= XFER_SW_DMA_2)
37 s = swdma_str[i];
38 else if (mode >= XFER_PIO_0 && mode <= XFER_PIO_6)
39 s = pio_str[i & 0x7];
40 else if (mode == XFER_PIO_SLOW)
41 s = "PIO SLOW";
42 else
43 s = "XFER ERROR";
44
45 return s;
46 }
47 EXPORT_SYMBOL(ide_xfer_verbose);
48
49 /**
50 * ide_get_best_pio_mode - get PIO mode from drive
51 * @drive: drive to consider
52 * @mode_wanted: preferred mode
53 * @max_mode: highest allowed mode
54 *
55 * This routine returns the recommended PIO settings for a given drive,
56 * based on the drive->id information and the ide_pio_blacklist[].
57 *
58 * Drive PIO mode is auto-selected if 255 is passed as mode_wanted.
59 * This is used by most chipset support modules when "auto-tuning".
60 */
61
ide_get_best_pio_mode(ide_drive_t * drive,u8 mode_wanted,u8 max_mode)62 static u8 ide_get_best_pio_mode(ide_drive_t *drive, u8 mode_wanted, u8 max_mode)
63 {
64 u16 *id = drive->id;
65 int pio_mode = -1, overridden = 0;
66
67 if (mode_wanted != 255)
68 return min_t(u8, mode_wanted, max_mode);
69
70 if ((drive->hwif->host_flags & IDE_HFLAG_PIO_NO_BLACKLIST) == 0)
71 pio_mode = ide_scan_pio_blacklist((char *)&id[ATA_ID_PROD]);
72
73 if (pio_mode != -1) {
74 printk(KERN_INFO "%s: is on PIO blacklist\n", drive->name);
75 } else {
76 pio_mode = id[ATA_ID_OLD_PIO_MODES] >> 8;
77 if (pio_mode > 2) { /* 2 is maximum allowed tPIO value */
78 pio_mode = 2;
79 overridden = 1;
80 }
81
82 if (id[ATA_ID_FIELD_VALID] & 2) { /* ATA2? */
83 if (ata_id_is_cfa(id) && (id[ATA_ID_CFA_MODES] & 7))
84 pio_mode = 4 + min_t(int, 2,
85 id[ATA_ID_CFA_MODES] & 7);
86 else if (ata_id_has_iordy(id)) {
87 if (id[ATA_ID_PIO_MODES] & 7) {
88 overridden = 0;
89 if (id[ATA_ID_PIO_MODES] & 4)
90 pio_mode = 5;
91 else if (id[ATA_ID_PIO_MODES] & 2)
92 pio_mode = 4;
93 else
94 pio_mode = 3;
95 }
96 }
97 }
98
99 if (overridden)
100 printk(KERN_INFO "%s: tPIO > 2, assuming tPIO = 2\n",
101 drive->name);
102 }
103
104 if (pio_mode > max_mode)
105 pio_mode = max_mode;
106
107 return pio_mode;
108 }
109
ide_pio_need_iordy(ide_drive_t * drive,const u8 pio)110 int ide_pio_need_iordy(ide_drive_t *drive, const u8 pio)
111 {
112 /*
113 * IORDY may lead to controller lock up on certain controllers
114 * if the port is not occupied.
115 */
116 if (pio == 0 && (drive->hwif->port_flags & IDE_PFLAG_PROBING))
117 return 0;
118 return ata_id_pio_need_iordy(drive->id, pio);
119 }
120 EXPORT_SYMBOL_GPL(ide_pio_need_iordy);
121
ide_set_pio_mode(ide_drive_t * drive,const u8 mode)122 int ide_set_pio_mode(ide_drive_t *drive, const u8 mode)
123 {
124 ide_hwif_t *hwif = drive->hwif;
125 const struct ide_port_ops *port_ops = hwif->port_ops;
126
127 if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
128 return 0;
129
130 if (port_ops == NULL || port_ops->set_pio_mode == NULL)
131 return -1;
132
133 /*
134 * TODO: temporary hack for some legacy host drivers that didn't
135 * set transfer mode on the device in ->set_pio_mode method...
136 */
137 if (port_ops->set_dma_mode == NULL) {
138 drive->pio_mode = mode;
139 port_ops->set_pio_mode(hwif, drive);
140 return 0;
141 }
142
143 if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
144 if (ide_config_drive_speed(drive, mode))
145 return -1;
146 drive->pio_mode = mode;
147 port_ops->set_pio_mode(hwif, drive);
148 return 0;
149 } else {
150 drive->pio_mode = mode;
151 port_ops->set_pio_mode(hwif, drive);
152 return ide_config_drive_speed(drive, mode);
153 }
154 }
155
ide_set_dma_mode(ide_drive_t * drive,const u8 mode)156 int ide_set_dma_mode(ide_drive_t *drive, const u8 mode)
157 {
158 ide_hwif_t *hwif = drive->hwif;
159 const struct ide_port_ops *port_ops = hwif->port_ops;
160
161 if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
162 return 0;
163
164 if (port_ops == NULL || port_ops->set_dma_mode == NULL)
165 return -1;
166
167 if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
168 if (ide_config_drive_speed(drive, mode))
169 return -1;
170 drive->dma_mode = mode;
171 port_ops->set_dma_mode(hwif, drive);
172 return 0;
173 } else {
174 drive->dma_mode = mode;
175 port_ops->set_dma_mode(hwif, drive);
176 return ide_config_drive_speed(drive, mode);
177 }
178 }
179 EXPORT_SYMBOL_GPL(ide_set_dma_mode);
180
181 /* req_pio == "255" for auto-tune */
ide_set_pio(ide_drive_t * drive,u8 req_pio)182 void ide_set_pio(ide_drive_t *drive, u8 req_pio)
183 {
184 ide_hwif_t *hwif = drive->hwif;
185 const struct ide_port_ops *port_ops = hwif->port_ops;
186 u8 host_pio, pio;
187
188 if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
189 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
190 return;
191
192 BUG_ON(hwif->pio_mask == 0x00);
193
194 host_pio = fls(hwif->pio_mask) - 1;
195
196 pio = ide_get_best_pio_mode(drive, req_pio, host_pio);
197
198 /*
199 * TODO:
200 * - report device max PIO mode
201 * - check req_pio != 255 against device max PIO mode
202 */
203 printk(KERN_DEBUG "%s: host max PIO%d wanted PIO%d%s selected PIO%d\n",
204 drive->name, host_pio, req_pio,
205 req_pio == 255 ? "(auto-tune)" : "", pio);
206
207 (void)ide_set_pio_mode(drive, XFER_PIO_0 + pio);
208 }
209 EXPORT_SYMBOL_GPL(ide_set_pio);
210
211 /**
212 * ide_rate_filter - filter transfer mode
213 * @drive: IDE device
214 * @speed: desired speed
215 *
216 * Given the available transfer modes this function returns
217 * the best available speed at or below the speed requested.
218 *
219 * TODO: check device PIO capabilities
220 */
221
ide_rate_filter(ide_drive_t * drive,u8 speed)222 static u8 ide_rate_filter(ide_drive_t *drive, u8 speed)
223 {
224 ide_hwif_t *hwif = drive->hwif;
225 u8 mode = ide_find_dma_mode(drive, speed);
226
227 if (mode == 0) {
228 if (hwif->pio_mask)
229 mode = fls(hwif->pio_mask) - 1 + XFER_PIO_0;
230 else
231 mode = XFER_PIO_4;
232 }
233
234 /* printk("%s: mode 0x%02x, speed 0x%02x\n", __func__, mode, speed); */
235
236 return min(speed, mode);
237 }
238
239 /**
240 * ide_set_xfer_rate - set transfer rate
241 * @drive: drive to set
242 * @rate: speed to attempt to set
243 *
244 * General helper for setting the speed of an IDE device. This
245 * function knows about user enforced limits from the configuration
246 * which ->set_pio_mode/->set_dma_mode does not.
247 */
248
ide_set_xfer_rate(ide_drive_t * drive,u8 rate)249 int ide_set_xfer_rate(ide_drive_t *drive, u8 rate)
250 {
251 ide_hwif_t *hwif = drive->hwif;
252 const struct ide_port_ops *port_ops = hwif->port_ops;
253
254 if (port_ops == NULL || port_ops->set_dma_mode == NULL ||
255 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
256 return -1;
257
258 rate = ide_rate_filter(drive, rate);
259
260 BUG_ON(rate < XFER_PIO_0);
261
262 if (rate >= XFER_PIO_0 && rate <= XFER_PIO_6)
263 return ide_set_pio_mode(drive, rate);
264
265 return ide_set_dma_mode(drive, rate);
266 }
267