Root/
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 | |
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 | |
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 | |
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 | 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 | |
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 */ |
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 | |
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 | |
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 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9