1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/types.h>
3 #include <linux/string.h>
4 #include <linux/kernel.h>
5 #include <linux/export.h>
6 #include <linux/interrupt.h>
7 #include <linux/ide.h>
8 #include <linux/bitops.h>
9
10 static const char *udma_str[] =
11 { "UDMA/16", "UDMA/25", "UDMA/33", "UDMA/44",
12 "UDMA/66", "UDMA/100", "UDMA/133", "UDMA7" };
13 static const char *mwdma_str[] =
14 { "MWDMA0", "MWDMA1", "MWDMA2", "MWDMA3", "MWDMA4" };
15 static const char *swdma_str[] =
16 { "SWDMA0", "SWDMA1", "SWDMA2" };
17 static const char *pio_str[] =
18 { "PIO0", "PIO1", "PIO2", "PIO3", "PIO4", "PIO5", "PIO6" };
19
20 /**
21 * ide_xfer_verbose - return IDE mode names
22 * @mode: transfer mode
23 *
24 * Returns a constant string giving the name of the mode
25 * requested.
26 */
27
ide_xfer_verbose(u8 mode)28 const char *ide_xfer_verbose(u8 mode)
29 {
30 const char *s;
31 u8 i = mode & 0xf;
32
33 if (mode >= XFER_UDMA_0 && mode <= XFER_UDMA_7)
34 s = udma_str[i];
35 else if (mode >= XFER_MW_DMA_0 && mode <= XFER_MW_DMA_4)
36 s = mwdma_str[i];
37 else if (mode >= XFER_SW_DMA_0 && mode <= XFER_SW_DMA_2)
38 s = swdma_str[i];
39 else if (mode >= XFER_PIO_0 && mode <= XFER_PIO_6)
40 s = pio_str[i & 0x7];
41 else if (mode == XFER_PIO_SLOW)
42 s = "PIO SLOW";
43 else
44 s = "XFER ERROR";
45
46 return s;
47 }
48 EXPORT_SYMBOL(ide_xfer_verbose);
49
50 /**
51 * ide_get_best_pio_mode - get PIO mode from drive
52 * @drive: drive to consider
53 * @mode_wanted: preferred mode
54 * @max_mode: highest allowed mode
55 *
56 * This routine returns the recommended PIO settings for a given drive,
57 * based on the drive->id information and the ide_pio_blacklist[].
58 *
59 * Drive PIO mode is auto-selected if 255 is passed as mode_wanted.
60 * This is used by most chipset support modules when "auto-tuning".
61 */
62
ide_get_best_pio_mode(ide_drive_t * drive,u8 mode_wanted,u8 max_mode)63 static u8 ide_get_best_pio_mode(ide_drive_t *drive, u8 mode_wanted, u8 max_mode)
64 {
65 u16 *id = drive->id;
66 int pio_mode = -1, overridden = 0;
67
68 if (mode_wanted != 255)
69 return min_t(u8, mode_wanted, max_mode);
70
71 if ((drive->hwif->host_flags & IDE_HFLAG_PIO_NO_BLACKLIST) == 0)
72 pio_mode = ide_scan_pio_blacklist((char *)&id[ATA_ID_PROD]);
73
74 if (pio_mode != -1) {
75 printk(KERN_INFO "%s: is on PIO blacklist\n", drive->name);
76 } else {
77 pio_mode = id[ATA_ID_OLD_PIO_MODES] >> 8;
78 if (pio_mode > 2) { /* 2 is maximum allowed tPIO value */
79 pio_mode = 2;
80 overridden = 1;
81 }
82
83 if (id[ATA_ID_FIELD_VALID] & 2) { /* ATA2? */
84 if (ata_id_is_cfa(id) && (id[ATA_ID_CFA_MODES] & 7))
85 pio_mode = 4 + min_t(int, 2,
86 id[ATA_ID_CFA_MODES] & 7);
87 else if (ata_id_has_iordy(id)) {
88 if (id[ATA_ID_PIO_MODES] & 7) {
89 overridden = 0;
90 if (id[ATA_ID_PIO_MODES] & 4)
91 pio_mode = 5;
92 else if (id[ATA_ID_PIO_MODES] & 2)
93 pio_mode = 4;
94 else
95 pio_mode = 3;
96 }
97 }
98 }
99
100 if (overridden)
101 printk(KERN_INFO "%s: tPIO > 2, assuming tPIO = 2\n",
102 drive->name);
103 }
104
105 if (pio_mode > max_mode)
106 pio_mode = max_mode;
107
108 return pio_mode;
109 }
110
ide_pio_need_iordy(ide_drive_t * drive,const u8 pio)111 int ide_pio_need_iordy(ide_drive_t *drive, const u8 pio)
112 {
113 /*
114 * IORDY may lead to controller lock up on certain controllers
115 * if the port is not occupied.
116 */
117 if (pio == 0 && (drive->hwif->port_flags & IDE_PFLAG_PROBING))
118 return 0;
119 return ata_id_pio_need_iordy(drive->id, pio);
120 }
121 EXPORT_SYMBOL_GPL(ide_pio_need_iordy);
122
ide_set_pio_mode(ide_drive_t * drive,const u8 mode)123 int ide_set_pio_mode(ide_drive_t *drive, const u8 mode)
124 {
125 ide_hwif_t *hwif = drive->hwif;
126 const struct ide_port_ops *port_ops = hwif->port_ops;
127
128 if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
129 return 0;
130
131 if (port_ops == NULL || port_ops->set_pio_mode == NULL)
132 return -1;
133
134 /*
135 * TODO: temporary hack for some legacy host drivers that didn't
136 * set transfer mode on the device in ->set_pio_mode method...
137 */
138 if (port_ops->set_dma_mode == NULL) {
139 drive->pio_mode = mode;
140 port_ops->set_pio_mode(hwif, drive);
141 return 0;
142 }
143
144 if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
145 if (ide_config_drive_speed(drive, mode))
146 return -1;
147 drive->pio_mode = mode;
148 port_ops->set_pio_mode(hwif, drive);
149 return 0;
150 } else {
151 drive->pio_mode = mode;
152 port_ops->set_pio_mode(hwif, drive);
153 return ide_config_drive_speed(drive, mode);
154 }
155 }
156
ide_set_dma_mode(ide_drive_t * drive,const u8 mode)157 int ide_set_dma_mode(ide_drive_t *drive, const u8 mode)
158 {
159 ide_hwif_t *hwif = drive->hwif;
160 const struct ide_port_ops *port_ops = hwif->port_ops;
161
162 if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
163 return 0;
164
165 if (port_ops == NULL || port_ops->set_dma_mode == NULL)
166 return -1;
167
168 if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
169 if (ide_config_drive_speed(drive, mode))
170 return -1;
171 drive->dma_mode = mode;
172 port_ops->set_dma_mode(hwif, drive);
173 return 0;
174 } else {
175 drive->dma_mode = mode;
176 port_ops->set_dma_mode(hwif, drive);
177 return ide_config_drive_speed(drive, mode);
178 }
179 }
180 EXPORT_SYMBOL_GPL(ide_set_dma_mode);
181
182 /* req_pio == "255" for auto-tune */
ide_set_pio(ide_drive_t * drive,u8 req_pio)183 void ide_set_pio(ide_drive_t *drive, u8 req_pio)
184 {
185 ide_hwif_t *hwif = drive->hwif;
186 const struct ide_port_ops *port_ops = hwif->port_ops;
187 u8 host_pio, pio;
188
189 if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
190 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
191 return;
192
193 BUG_ON(hwif->pio_mask == 0x00);
194
195 host_pio = fls(hwif->pio_mask) - 1;
196
197 pio = ide_get_best_pio_mode(drive, req_pio, host_pio);
198
199 /*
200 * TODO:
201 * - report device max PIO mode
202 * - check req_pio != 255 against device max PIO mode
203 */
204 printk(KERN_DEBUG "%s: host max PIO%d wanted PIO%d%s selected PIO%d\n",
205 drive->name, host_pio, req_pio,
206 req_pio == 255 ? "(auto-tune)" : "", pio);
207
208 (void)ide_set_pio_mode(drive, XFER_PIO_0 + pio);
209 }
210 EXPORT_SYMBOL_GPL(ide_set_pio);
211
212 /**
213 * ide_rate_filter - filter transfer mode
214 * @drive: IDE device
215 * @speed: desired speed
216 *
217 * Given the available transfer modes this function returns
218 * the best available speed at or below the speed requested.
219 *
220 * TODO: check device PIO capabilities
221 */
222
ide_rate_filter(ide_drive_t * drive,u8 speed)223 static u8 ide_rate_filter(ide_drive_t *drive, u8 speed)
224 {
225 ide_hwif_t *hwif = drive->hwif;
226 u8 mode = ide_find_dma_mode(drive, speed);
227
228 if (mode == 0) {
229 if (hwif->pio_mask)
230 mode = fls(hwif->pio_mask) - 1 + XFER_PIO_0;
231 else
232 mode = XFER_PIO_4;
233 }
234
235 /* printk("%s: mode 0x%02x, speed 0x%02x\n", __func__, mode, speed); */
236
237 return min(speed, mode);
238 }
239
240 /**
241 * ide_set_xfer_rate - set transfer rate
242 * @drive: drive to set
243 * @rate: speed to attempt to set
244 *
245 * General helper for setting the speed of an IDE device. This
246 * function knows about user enforced limits from the configuration
247 * which ->set_pio_mode/->set_dma_mode does not.
248 */
249
ide_set_xfer_rate(ide_drive_t * drive,u8 rate)250 int ide_set_xfer_rate(ide_drive_t *drive, u8 rate)
251 {
252 ide_hwif_t *hwif = drive->hwif;
253 const struct ide_port_ops *port_ops = hwif->port_ops;
254
255 if (port_ops == NULL || port_ops->set_dma_mode == NULL ||
256 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
257 return -1;
258
259 rate = ide_rate_filter(drive, rate);
260
261 BUG_ON(rate < XFER_PIO_0);
262
263 if (rate >= XFER_PIO_0 && rate <= XFER_PIO_6)
264 return ide_set_pio_mode(drive, rate);
265
266 return ide_set_dma_mode(drive, rate);
267 }
268