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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" }; | |
13 | static const char *swdma_str[] = | |
14 | { "SWDMA0", "SWDMA1", "SWDMA2" }; | |
15 | static const char *pio_str[] = | |
16 | { "PIO0", "PIO1", "PIO2", "PIO3", "PIO4", "PIO5" }; | |
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_2) | |
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_5) | |
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_has_iordy(id)) { | |
83 | if (id[ATA_ID_PIO_MODES] & 7) { | |
84 | overridden = 0; | |
85 | if (id[ATA_ID_PIO_MODES] & 4) | |
86 | pio_mode = 5; | |
87 | else if (id[ATA_ID_PIO_MODES] & 2) | |
88 | pio_mode = 4; | |
89 | else | |
90 | pio_mode = 3; | |
91 | } | |
92 | } | |
93 | } | |
94 | ||
95 | if (overridden) | |
96 | printk(KERN_INFO "%s: tPIO > 2, assuming tPIO = 2\n", | |
97 | drive->name); | |
98 | } | |
99 | ||
100 | if (pio_mode > max_mode) | |
101 | pio_mode = max_mode; | |
102 | ||
103 | return pio_mode; | |
104 | } | |
105 | EXPORT_SYMBOL_GPL(ide_get_best_pio_mode); | |
106 | ||
107 | int ide_set_pio_mode(ide_drive_t *drive, const u8 mode) | |
108 | { | |
109 | ide_hwif_t *hwif = drive->hwif; | |
110 | const struct ide_port_ops *port_ops = hwif->port_ops; | |
111 | ||
112 | if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE) | |
113 | return 0; | |
114 | ||
115 | if (port_ops == NULL || port_ops->set_pio_mode == NULL) | |
116 | return -1; | |
117 | ||
118 | /* | |
119 | * TODO: temporary hack for some legacy host drivers that didn't | |
120 | * set transfer mode on the device in ->set_pio_mode method... | |
121 | */ | |
122 | if (port_ops->set_dma_mode == NULL) { | |
123 | port_ops->set_pio_mode(drive, mode - XFER_PIO_0); | |
124 | return 0; | |
125 | } | |
126 | ||
127 | if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) { | |
128 | if (ide_config_drive_speed(drive, mode)) | |
129 | return -1; | |
130 | port_ops->set_pio_mode(drive, mode - XFER_PIO_0); | |
131 | return 0; | |
132 | } else { | |
133 | port_ops->set_pio_mode(drive, mode - XFER_PIO_0); | |
134 | return ide_config_drive_speed(drive, mode); | |
135 | } | |
136 | } | |
137 | ||
138 | int ide_set_dma_mode(ide_drive_t *drive, const u8 mode) | |
139 | { | |
140 | ide_hwif_t *hwif = drive->hwif; | |
141 | const struct ide_port_ops *port_ops = hwif->port_ops; | |
142 | ||
143 | if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE) | |
144 | return 0; | |
145 | ||
146 | if (port_ops == NULL || port_ops->set_dma_mode == NULL) | |
147 | return -1; | |
148 | ||
149 | if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) { | |
150 | if (ide_config_drive_speed(drive, mode)) | |
151 | return -1; | |
152 | port_ops->set_dma_mode(drive, mode); | |
153 | return 0; | |
154 | } else { | |
155 | port_ops->set_dma_mode(drive, mode); | |
156 | return ide_config_drive_speed(drive, mode); | |
157 | } | |
158 | } | |
159 | EXPORT_SYMBOL_GPL(ide_set_dma_mode); | |
160 | ||
161 | /* req_pio == "255" for auto-tune */ | |
162 | void ide_set_pio(ide_drive_t *drive, u8 req_pio) | |
163 | { | |
164 | ide_hwif_t *hwif = drive->hwif; | |
165 | const struct ide_port_ops *port_ops = hwif->port_ops; | |
166 | u8 host_pio, pio; | |
167 | ||
168 | if (port_ops == NULL || port_ops->set_pio_mode == NULL || | |
169 | (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)) | |
170 | return; | |
171 | ||
172 | BUG_ON(hwif->pio_mask == 0x00); | |
173 | ||
174 | host_pio = fls(hwif->pio_mask) - 1; | |
175 | ||
176 | pio = ide_get_best_pio_mode(drive, req_pio, host_pio); | |
177 | ||
178 | /* | |
179 | * TODO: | |
180 | * - report device max PIO mode | |
181 | * - check req_pio != 255 against device max PIO mode | |
182 | */ | |
183 | printk(KERN_DEBUG "%s: host max PIO%d wanted PIO%d%s selected PIO%d\n", | |
184 | drive->name, host_pio, req_pio, | |
185 | req_pio == 255 ? "(auto-tune)" : "", pio); | |
186 | ||
187 | (void)ide_set_pio_mode(drive, XFER_PIO_0 + pio); | |
188 | } | |
189 | EXPORT_SYMBOL_GPL(ide_set_pio); | |
190 | ||
191 | /** | |
192 | * ide_rate_filter - filter transfer mode | |
193 | * @drive: IDE device | |
194 | * @speed: desired speed | |
195 | * | |
196 | * Given the available transfer modes this function returns | |
197 | * the best available speed at or below the speed requested. | |
198 | * | |
199 | * TODO: check device PIO capabilities | |
200 | */ | |
201 | ||
202 | static u8 ide_rate_filter(ide_drive_t *drive, u8 speed) | |
203 | { | |
204 | ide_hwif_t *hwif = drive->hwif; | |
205 | u8 mode = ide_find_dma_mode(drive, speed); | |
206 | ||
207 | if (mode == 0) { | |
208 | if (hwif->pio_mask) | |
209 | mode = fls(hwif->pio_mask) - 1 + XFER_PIO_0; | |
210 | else | |
211 | mode = XFER_PIO_4; | |
212 | } | |
213 | ||
214 | /* printk("%s: mode 0x%02x, speed 0x%02x\n", __func__, mode, speed); */ | |
215 | ||
216 | return min(speed, mode); | |
217 | } | |
218 | ||
219 | /** | |
220 | * ide_set_xfer_rate - set transfer rate | |
221 | * @drive: drive to set | |
222 | * @rate: speed to attempt to set | |
223 | * | |
224 | * General helper for setting the speed of an IDE device. This | |
225 | * function knows about user enforced limits from the configuration | |
226 | * which ->set_pio_mode/->set_dma_mode does not. | |
227 | */ | |
228 | ||
229 | int ide_set_xfer_rate(ide_drive_t *drive, u8 rate) | |
230 | { | |
231 | ide_hwif_t *hwif = drive->hwif; | |
232 | const struct ide_port_ops *port_ops = hwif->port_ops; | |
233 | ||
234 | if (port_ops == NULL || port_ops->set_dma_mode == NULL || | |
235 | (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)) | |
236 | return -1; | |
237 | ||
238 | rate = ide_rate_filter(drive, rate); | |
239 | ||
240 | BUG_ON(rate < XFER_PIO_0); | |
241 | ||
242 | if (rate >= XFER_PIO_0 && rate <= XFER_PIO_5) | |
243 | return ide_set_pio_mode(drive, rate); | |
244 | ||
245 | return ide_set_dma_mode(drive, rate); | |
246 | } |