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
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
61 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 EXPORT_SYMBOL_GPL(ide_get_best_pio_mode);
109
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
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 port_ops->set_pio_mode(drive, mode - XFER_PIO_0);
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 port_ops->set_pio_mode(drive, mode - XFER_PIO_0);
146 return 0;
147 } else {
148 port_ops->set_pio_mode(drive, mode - XFER_PIO_0);
149 return ide_config_drive_speed(drive, mode);
150 }
151 }
152
153 int ide_set_dma_mode(ide_drive_t *drive, const u8 mode)
154 {
155 ide_hwif_t *hwif = drive->hwif;
156 const struct ide_port_ops *port_ops = hwif->port_ops;
157
158 if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
159 return 0;
160
161 if (port_ops == NULL || port_ops->set_dma_mode == NULL)
162 return -1;
163
164 if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
165 if (ide_config_drive_speed(drive, mode))
166 return -1;
167 port_ops->set_dma_mode(drive, mode);
168 return 0;
169 } else {
170 port_ops->set_dma_mode(drive, mode);
171 return ide_config_drive_speed(drive, mode);
172 }
173 }
174 EXPORT_SYMBOL_GPL(ide_set_dma_mode);
175
176 /* req_pio == "255" for auto-tune */
177 void ide_set_pio(ide_drive_t *drive, u8 req_pio)
178 {
179 ide_hwif_t *hwif = drive->hwif;
180 const struct ide_port_ops *port_ops = hwif->port_ops;
181 u8 host_pio, pio;
182
183 if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
184 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
185 return;
186
187 BUG_ON(hwif->pio_mask == 0x00);
188
189 host_pio = fls(hwif->pio_mask) - 1;
190
191 pio = ide_get_best_pio_mode(drive, req_pio, host_pio);
192
193 /*
194 * TODO:
195 * - report device max PIO mode
196 * - check req_pio != 255 against device max PIO mode
197 */
198 printk(KERN_DEBUG "%s: host max PIO%d wanted PIO%d%s selected PIO%d\n",
199 drive->name, host_pio, req_pio,
200 req_pio == 255 ? "(auto-tune)" : "", pio);
201
202 (void)ide_set_pio_mode(drive, XFER_PIO_0 + pio);
203 }
204 EXPORT_SYMBOL_GPL(ide_set_pio);
205
206 /**
207 * ide_rate_filter - filter transfer mode
208 * @drive: IDE device
209 * @speed: desired speed
210 *
211 * Given the available transfer modes this function returns
212 * the best available speed at or below the speed requested.
213 *
214 * TODO: check device PIO capabilities
215 */
216
217 static u8 ide_rate_filter(ide_drive_t *drive, u8 speed)
218 {
219 ide_hwif_t *hwif = drive->hwif;
220 u8 mode = ide_find_dma_mode(drive, speed);
221
222 if (mode == 0) {
223 if (hwif->pio_mask)
224 mode = fls(hwif->pio_mask) - 1 + XFER_PIO_0;
225 else
226 mode = XFER_PIO_4;
227 }
228
229 /* printk("%s: mode 0x%02x, speed 0x%02x\n", __func__, mode, speed); */
230
231 return min(speed, mode);
232 }
233
234 /**
235 * ide_set_xfer_rate - set transfer rate
236 * @drive: drive to set
237 * @rate: speed to attempt to set
238 *
239 * General helper for setting the speed of an IDE device. This
240 * function knows about user enforced limits from the configuration
241 * which ->set_pio_mode/->set_dma_mode does not.
242 */
243
244 int ide_set_xfer_rate(ide_drive_t *drive, u8 rate)
245 {
246 ide_hwif_t *hwif = drive->hwif;
247 const struct ide_port_ops *port_ops = hwif->port_ops;
248
249 if (port_ops == NULL || port_ops->set_dma_mode == NULL ||
250 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
251 return -1;
252
253 rate = ide_rate_filter(drive, rate);
254
255 BUG_ON(rate < XFER_PIO_0);
256
257 if (rate >= XFER_PIO_0 && rate <= XFER_PIO_6)
258 return ide_set_pio_mode(drive, rate);
259
260 return ide_set_dma_mode(drive, rate);
261 }
262
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