tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
8static const char *udma_str[] =
9 { "UDMA/16", "UDMA/25", "UDMA/33", "UDMA/44",
10 "UDMA/66", "UDMA/100", "UDMA/133", "UDMA7" };
11static const char *mwdma_str[] =
12 { "MWDMA0", "MWDMA1", "MWDMA2", "MWDMA3", "MWDMA4" };
13static const char *swdma_str[] =
14 { "SWDMA0", "SWDMA1", "SWDMA2" };
15static 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
26const 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}
46EXPORT_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
61u8 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}
108EXPORT_SYMBOL_GPL(ide_get_best_pio_mode);
109
110int ide_set_pio_mode(ide_drive_t *drive, const u8 mode)
111{
112 ide_hwif_t *hwif = drive->hwif;
113 const struct ide_port_ops *port_ops = hwif->port_ops;
114
115 if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
116 return 0;
117
118 if (port_ops == NULL || port_ops->set_pio_mode == NULL)
119 return -1;
120
121 /*
122 * TODO: temporary hack for some legacy host drivers that didn't
123 * set transfer mode on the device in ->set_pio_mode method...
124 */
125 if (port_ops->set_dma_mode == NULL) {
126 port_ops->set_pio_mode(drive, mode - XFER_PIO_0);
127 return 0;
128 }
129
130 if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
131 if (ide_config_drive_speed(drive, mode))
132 return -1;
133 port_ops->set_pio_mode(drive, mode - XFER_PIO_0);
134 return 0;
135 } else {
136 port_ops->set_pio_mode(drive, mode - XFER_PIO_0);
137 return ide_config_drive_speed(drive, mode);
138 }
139}
140
141int ide_set_dma_mode(ide_drive_t *drive, const u8 mode)
142{
143 ide_hwif_t *hwif = drive->hwif;
144 const struct ide_port_ops *port_ops = hwif->port_ops;
145
146 if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
147 return 0;
148
149 if (port_ops == NULL || port_ops->set_dma_mode == NULL)
150 return -1;
151
152 if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
153 if (ide_config_drive_speed(drive, mode))
154 return -1;
155 port_ops->set_dma_mode(drive, mode);
156 return 0;
157 } else {
158 port_ops->set_dma_mode(drive, mode);
159 return ide_config_drive_speed(drive, mode);
160 }
161}
162EXPORT_SYMBOL_GPL(ide_set_dma_mode);
163
164/* req_pio == "255" for auto-tune */
165void ide_set_pio(ide_drive_t *drive, u8 req_pio)
166{
167 ide_hwif_t *hwif = drive->hwif;
168 const struct ide_port_ops *port_ops = hwif->port_ops;
169 u8 host_pio, pio;
170
171 if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
172 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
173 return;
174
175 BUG_ON(hwif->pio_mask == 0x00);
176
177 host_pio = fls(hwif->pio_mask) - 1;
178
179 pio = ide_get_best_pio_mode(drive, req_pio, host_pio);
180
181 /*
182 * TODO:
183 * - report device max PIO mode
184 * - check req_pio != 255 against device max PIO mode
185 */
186 printk(KERN_DEBUG "%s: host max PIO%d wanted PIO%d%s selected PIO%d\n",
187 drive->name, host_pio, req_pio,
188 req_pio == 255 ? "(auto-tune)" : "", pio);
189
190 (void)ide_set_pio_mode(drive, XFER_PIO_0 + pio);
191}
192EXPORT_SYMBOL_GPL(ide_set_pio);
193
194/**
195 * ide_rate_filter - filter transfer mode
196 * @drive: IDE device
197 * @speed: desired speed
198 *
199 * Given the available transfer modes this function returns
200 * the best available speed at or below the speed requested.
201 *
202 * TODO: check device PIO capabilities
203 */
204
205static u8 ide_rate_filter(ide_drive_t *drive, u8 speed)
206{
207 ide_hwif_t *hwif = drive->hwif;
208 u8 mode = ide_find_dma_mode(drive, speed);
209
210 if (mode == 0) {
211 if (hwif->pio_mask)
212 mode = fls(hwif->pio_mask) - 1 + XFER_PIO_0;
213 else
214 mode = XFER_PIO_4;
215 }
216
217/* printk("%s: mode 0x%02x, speed 0x%02x\n", __func__, mode, speed); */
218
219 return min(speed, mode);
220}
221
222/**
223 * ide_set_xfer_rate - set transfer rate
224 * @drive: drive to set
225 * @rate: speed to attempt to set
226 *
227 * General helper for setting the speed of an IDE device. This
228 * function knows about user enforced limits from the configuration
229 * which ->set_pio_mode/->set_dma_mode does not.
230 */
231
232int ide_set_xfer_rate(ide_drive_t *drive, u8 rate)
233{
234 ide_hwif_t *hwif = drive->hwif;
235 const struct ide_port_ops *port_ops = hwif->port_ops;
236
237 if (port_ops == NULL || port_ops->set_dma_mode == NULL ||
238 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
239 return -1;
240
241 rate = ide_rate_filter(drive, rate);
242
243 BUG_ON(rate < XFER_PIO_0);
244
245 if (rate >= XFER_PIO_0 && rate <= XFER_PIO_6)
246 return ide_set_pio_mode(drive, rate);
247
248 return ide_set_dma_mode(drive, rate);
249}