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025621f9 AC |
1 | /* |
2 | * ACPI PATA driver | |
3 | * | |
4 | * (c) 2007 Red Hat <alan@redhat.com> | |
5 | */ | |
6 | ||
7 | #include <linux/kernel.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/pci.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/blkdev.h> | |
12 | #include <linux/delay.h> | |
13 | #include <linux/device.h> | |
14 | #include <scsi/scsi_host.h> | |
15 | #include <acpi/acpi_bus.h> | |
16 | #include <acpi/acnames.h> | |
17 | #include <acpi/acnamesp.h> | |
18 | #include <acpi/acparser.h> | |
19 | #include <acpi/acexcep.h> | |
20 | #include <acpi/acmacros.h> | |
21 | #include <acpi/actypes.h> | |
22 | ||
23 | #include <linux/libata.h> | |
24 | #include <linux/ata.h> | |
25 | ||
26 | #define DRV_NAME "pata_acpi" | |
27 | #define DRV_VERSION "0.2.3" | |
28 | ||
29 | struct pata_acpi { | |
30 | struct ata_acpi_gtm gtm; | |
31 | void *last; | |
32 | unsigned long mask[2]; | |
33 | }; | |
34 | ||
35 | /** | |
36 | * pacpi_pre_reset - check for 40/80 pin | |
37 | * @ap: Port | |
38 | * @deadline: deadline jiffies for the operation | |
39 | * | |
40 | * Perform the PATA port setup we need. | |
41 | */ | |
42 | ||
43 | static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline) | |
44 | { | |
45 | struct ata_port *ap = link->ap; | |
46 | struct pata_acpi *acpi = ap->private_data; | |
47 | if (ap->acpi_handle == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0) | |
48 | return -ENODEV; | |
49 | ||
50 | return ata_std_prereset(link, deadline); | |
51 | } | |
52 | ||
53 | /** | |
54 | * pacpi_cable_detect - cable type detection | |
55 | * @ap: port to detect | |
56 | * | |
57 | * Perform device specific cable detection | |
58 | */ | |
59 | ||
60 | static int pacpi_cable_detect(struct ata_port *ap) | |
61 | { | |
62 | struct pata_acpi *acpi = ap->private_data; | |
63 | ||
64 | if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA)) | |
65 | return ATA_CBL_PATA80; | |
66 | else | |
67 | return ATA_CBL_PATA40; | |
68 | } | |
69 | ||
70 | /** | |
71 | * pacpi_error_handler - Setup and error handler | |
72 | * @ap: Port to handle | |
73 | * | |
74 | * LOCKING: | |
75 | * None (inherited from caller). | |
76 | */ | |
77 | ||
78 | static void pacpi_error_handler(struct ata_port *ap) | |
79 | { | |
80 | return ata_bmdma_drive_eh(ap, pacpi_pre_reset, ata_std_softreset, | |
81 | NULL, ata_std_postreset); | |
82 | } | |
83 | ||
84 | /* Welcome to ACPI, bring a bucket */ | |
85 | static const unsigned int pio_cycle[7] = { | |
86 | 600, 383, 240, 180, 120, 100, 80 | |
87 | }; | |
88 | static const unsigned int mwdma_cycle[5] = { | |
89 | 480, 150, 120, 100, 80 | |
90 | }; | |
91 | static const unsigned int udma_cycle[7] = { | |
92 | 120, 80, 60, 45, 30, 20, 15 | |
93 | }; | |
94 | ||
95 | /** | |
96 | * pacpi_discover_modes - filter non ACPI modes | |
97 | * @adev: ATA device | |
98 | * @mask: proposed modes | |
99 | * | |
100 | * Try the modes available and see which ones the ACPI method will | |
101 | * set up sensibly. From this we get a mask of ACPI modes we can use | |
102 | */ | |
103 | ||
104 | static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev) | |
105 | { | |
106 | int unit = adev->devno; | |
107 | struct pata_acpi *acpi = ap->private_data; | |
108 | int i; | |
109 | u32 t; | |
110 | unsigned long mask = (0x7f << ATA_SHIFT_UDMA) | (0x7 << ATA_SHIFT_MWDMA) | (0x1F << ATA_SHIFT_PIO); | |
111 | ||
112 | struct ata_acpi_gtm probe; | |
113 | ||
114 | probe = acpi->gtm; | |
115 | ||
116 | /* We always use the 0 slot for crap hardware */ | |
117 | if (!(probe.flags & 0x10)) | |
118 | unit = 0; | |
119 | ||
120 | ata_acpi_gtm(ap, &probe); | |
121 | ||
122 | /* Start by scanning for PIO modes */ | |
123 | for (i = 0; i < 7; i++) { | |
124 | t = probe.drive[unit].pio; | |
125 | if (t <= pio_cycle[i]) { | |
126 | mask |= (2 << (ATA_SHIFT_PIO + i)) - 1; | |
127 | break; | |
128 | } | |
129 | } | |
130 | ||
131 | /* See if we have MWDMA or UDMA data. We don't bother with MWDMA | |
132 | if UDMA is availabe as this means the BIOS set UDMA and our | |
133 | error changedown if it works is UDMA to PIO anyway */ | |
134 | if (probe.flags & (1 << (2 * unit))) { | |
135 | /* MWDMA */ | |
136 | for (i = 0; i < 5; i++) { | |
137 | t = probe.drive[unit].dma; | |
138 | if (t <= mwdma_cycle[i]) { | |
139 | mask |= (2 << (ATA_SHIFT_MWDMA + i)) - 1; | |
140 | break; | |
141 | } | |
142 | } | |
143 | } else { | |
144 | /* UDMA */ | |
145 | for (i = 0; i < 7; i++) { | |
146 | t = probe.drive[unit].dma; | |
147 | if (t <= udma_cycle[i]) { | |
148 | mask |= (2 << (ATA_SHIFT_UDMA + i)) - 1; | |
149 | break; | |
150 | } | |
151 | } | |
152 | } | |
153 | if (mask & (0xF8 << ATA_SHIFT_UDMA)) | |
154 | ap->cbl = ATA_CBL_PATA80; | |
155 | return mask; | |
156 | } | |
157 | ||
158 | /** | |
159 | * pacpi_mode_filter - mode filter for ACPI | |
160 | * @adev: device | |
161 | * @mask: mask of valid modes | |
162 | * | |
163 | * Filter the valid mode list according to our own specific rules, in | |
164 | * this case the list of discovered valid modes obtained by ACPI probing | |
165 | */ | |
166 | ||
167 | static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask) | |
168 | { | |
169 | struct pata_acpi *acpi = adev->link->ap->private_data; | |
170 | return ata_pci_default_filter(adev, mask & acpi->mask[adev->devno]); | |
171 | } | |
172 | ||
173 | /** | |
174 | * pacpi_set_piomode - set initial PIO mode data | |
175 | * @ap: ATA interface | |
176 | * @adev: ATA device | |
177 | */ | |
178 | ||
179 | static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev) | |
180 | { | |
181 | int unit = adev->devno; | |
182 | struct pata_acpi *acpi = ap->private_data; | |
183 | ||
184 | if(!(acpi->gtm.flags & 0x10)) | |
185 | unit = 0; | |
186 | ||
187 | /* Now stuff the nS values into the structure */ | |
188 | acpi->gtm.drive[unit].pio = pio_cycle[adev->pio_mode - XFER_PIO_0]; | |
189 | ata_acpi_stm(ap, &acpi->gtm); | |
190 | /* See what mode we actually got */ | |
191 | ata_acpi_gtm(ap, &acpi->gtm); | |
192 | } | |
193 | ||
194 | /** | |
195 | * pacpi_set_dmamode - set initial DMA mode data | |
196 | * @ap: ATA interface | |
197 | * @adev: ATA device | |
198 | */ | |
199 | ||
200 | static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev) | |
201 | { | |
202 | int unit = adev->devno; | |
203 | struct pata_acpi *acpi = ap->private_data; | |
204 | ||
205 | if(!(acpi->gtm.flags & 0x10)) | |
206 | unit = 0; | |
207 | ||
208 | /* Now stuff the nS values into the structure */ | |
209 | if (adev->dma_mode >= XFER_UDMA_0) { | |
210 | acpi->gtm.drive[unit].dma = udma_cycle[adev->dma_mode - XFER_UDMA_0]; | |
211 | acpi->gtm.flags |= (1 << (2 * unit)); | |
212 | } else { | |
213 | acpi->gtm.drive[unit].dma = mwdma_cycle[adev->dma_mode - XFER_MW_DMA_0]; | |
214 | acpi->gtm.flags &= ~(1 << (2 * unit)); | |
215 | } | |
216 | ata_acpi_stm(ap, &acpi->gtm); | |
217 | /* See what mode we actually got */ | |
218 | ata_acpi_gtm(ap, &acpi->gtm); | |
219 | } | |
220 | ||
221 | /** | |
222 | * pacpi_qc_issue_prot - command issue | |
223 | * @qc: command pending | |
224 | * | |
225 | * Called when the libata layer is about to issue a command. We wrap | |
226 | * this interface so that we can load the correct ATA timings if | |
227 | * neccessary. | |
228 | */ | |
229 | ||
230 | static unsigned int pacpi_qc_issue_prot(struct ata_queued_cmd *qc) | |
231 | { | |
232 | struct ata_port *ap = qc->ap; | |
233 | struct ata_device *adev = qc->dev; | |
234 | struct pata_acpi *acpi = ap->private_data; | |
235 | ||
236 | if (acpi->gtm.flags & 0x10) | |
237 | return ata_qc_issue_prot(qc); | |
238 | ||
239 | if (adev != acpi->last) { | |
240 | pacpi_set_piomode(ap, adev); | |
241 | if (adev->dma_mode) | |
242 | pacpi_set_dmamode(ap, adev); | |
243 | acpi->last = adev; | |
244 | } | |
245 | return ata_qc_issue_prot(qc); | |
246 | } | |
247 | ||
248 | /** | |
249 | * pacpi_port_start - port setup | |
250 | * @ap: ATA port being set up | |
251 | * | |
252 | * Use the port_start hook to maintain private control structures | |
253 | */ | |
254 | ||
255 | static int pacpi_port_start(struct ata_port *ap) | |
256 | { | |
257 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); | |
258 | struct pata_acpi *acpi; | |
259 | ||
260 | int ret; | |
261 | ||
262 | if (ap->acpi_handle == NULL) | |
263 | return -ENODEV; | |
264 | ||
265 | acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL); | |
266 | if (ap->private_data == NULL) | |
267 | return -ENOMEM; | |
268 | acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]); | |
269 | acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]); | |
270 | ret = ata_sff_port_start(ap); | |
271 | if (ret < 0) | |
272 | return ret; | |
273 | ||
274 | return ret; | |
275 | } | |
276 | ||
277 | static struct scsi_host_template pacpi_sht = { | |
278 | .module = THIS_MODULE, | |
279 | .name = DRV_NAME, | |
280 | .ioctl = ata_scsi_ioctl, | |
281 | .queuecommand = ata_scsi_queuecmd, | |
282 | .can_queue = ATA_DEF_QUEUE, | |
283 | .this_id = ATA_SHT_THIS_ID, | |
284 | .sg_tablesize = LIBATA_MAX_PRD, | |
285 | .cmd_per_lun = ATA_SHT_CMD_PER_LUN, | |
286 | .emulated = ATA_SHT_EMULATED, | |
287 | .use_clustering = ATA_SHT_USE_CLUSTERING, | |
288 | .proc_name = DRV_NAME, | |
289 | .dma_boundary = ATA_DMA_BOUNDARY, | |
290 | .slave_configure = ata_scsi_slave_config, | |
291 | .slave_destroy = ata_scsi_slave_destroy, | |
292 | /* Use standard CHS mapping rules */ | |
293 | .bios_param = ata_std_bios_param, | |
294 | }; | |
295 | ||
296 | static const struct ata_port_operations pacpi_ops = { | |
297 | .set_piomode = pacpi_set_piomode, | |
298 | .set_dmamode = pacpi_set_dmamode, | |
299 | .mode_filter = pacpi_mode_filter, | |
300 | ||
301 | /* Task file is PCI ATA format, use helpers */ | |
302 | .tf_load = ata_tf_load, | |
303 | .tf_read = ata_tf_read, | |
304 | .check_status = ata_check_status, | |
305 | .exec_command = ata_exec_command, | |
306 | .dev_select = ata_std_dev_select, | |
307 | ||
308 | .freeze = ata_bmdma_freeze, | |
309 | .thaw = ata_bmdma_thaw, | |
310 | .error_handler = pacpi_error_handler, | |
311 | .post_internal_cmd = ata_bmdma_post_internal_cmd, | |
312 | .cable_detect = pacpi_cable_detect, | |
313 | ||
314 | /* BMDMA handling is PCI ATA format, use helpers */ | |
315 | .bmdma_setup = ata_bmdma_setup, | |
316 | .bmdma_start = ata_bmdma_start, | |
317 | .bmdma_stop = ata_bmdma_stop, | |
318 | .bmdma_status = ata_bmdma_status, | |
319 | .qc_prep = ata_qc_prep, | |
320 | .qc_issue = pacpi_qc_issue_prot, | |
321 | .data_xfer = ata_data_xfer, | |
322 | ||
323 | /* Timeout handling */ | |
324 | .irq_handler = ata_interrupt, | |
325 | .irq_clear = ata_bmdma_irq_clear, | |
326 | .irq_on = ata_irq_on, | |
327 | ||
328 | /* Generic PATA PCI ATA helpers */ | |
329 | .port_start = pacpi_port_start, | |
330 | }; | |
331 | ||
332 | ||
333 | /** | |
334 | * pacpi_init_one - Register ACPI ATA PCI device with kernel services | |
335 | * @pdev: PCI device to register | |
336 | * @ent: Entry in pacpi_pci_tbl matching with @pdev | |
337 | * | |
338 | * Called from kernel PCI layer. | |
339 | * | |
340 | * LOCKING: | |
341 | * Inherited from PCI layer (may sleep). | |
342 | * | |
343 | * RETURNS: | |
344 | * Zero on success, or -ERRNO value. | |
345 | */ | |
346 | ||
347 | static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id) | |
348 | { | |
349 | static const struct ata_port_info info = { | |
350 | .sht = &pacpi_sht, | |
351 | .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST, | |
352 | ||
353 | .pio_mask = 0x1f, | |
354 | .mwdma_mask = 0x07, | |
355 | .udma_mask = 0x7f, | |
356 | ||
357 | .port_ops = &pacpi_ops, | |
358 | }; | |
359 | const struct ata_port_info *ppi[] = { &info, NULL }; | |
360 | return ata_pci_init_one(pdev, ppi); | |
361 | } | |
362 | ||
363 | static const struct pci_device_id pacpi_pci_tbl[] = { | |
364 | { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1}, | |
365 | { } /* terminate list */ | |
366 | }; | |
367 | ||
368 | static struct pci_driver pacpi_pci_driver = { | |
369 | .name = DRV_NAME, | |
370 | .id_table = pacpi_pci_tbl, | |
371 | .probe = pacpi_init_one, | |
372 | .remove = ata_pci_remove_one, | |
373 | .suspend = ata_pci_device_suspend, | |
374 | .resume = ata_pci_device_resume, | |
375 | }; | |
376 | ||
377 | static int __init pacpi_init(void) | |
378 | { | |
379 | return pci_register_driver(&pacpi_pci_driver); | |
380 | } | |
381 | ||
382 | static void __exit pacpi_exit(void) | |
383 | { | |
384 | pci_unregister_driver(&pacpi_pci_driver); | |
385 | } | |
386 | ||
387 | module_init(pacpi_init); | |
388 | module_exit(pacpi_exit); | |
389 | ||
390 | MODULE_AUTHOR("Alan Cox"); | |
391 | MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode"); | |
392 | MODULE_LICENSE("GPL"); | |
393 | MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl); | |
394 | MODULE_VERSION(DRV_VERSION); | |
395 |