3 * Provides ACPI support for PATA/SATA.
5 * Copyright (C) 2006 Intel Corp.
6 * Copyright (C) 2006 Randy Dunlap
10 #include <linux/delay.h>
11 #include <linux/device.h>
12 #include <linux/errno.h>
13 #include <linux/kernel.h>
14 #include <linux/acpi.h>
15 #include <linux/libata.h>
16 #include <linux/pci.h>
19 #include <acpi/acpi_bus.h>
20 #include <acpi/acnames.h>
21 #include <acpi/acnamesp.h>
22 #include <acpi/acparser.h>
23 #include <acpi/acexcep.h>
24 #include <acpi/acmacros.h>
25 #include <acpi/actypes.h>
27 #define NO_PORT_MULT 0xffff
28 #define SATA_ADR(root,pmp) (((root) << 16) | (pmp))
30 #define REGS_PER_GTF 7
32 u8 tf[REGS_PER_GTF]; /* regs. 0x1f1 - 0x1f7 */
36 * Helper - belongs in the PCI layer somewhere eventually
38 static int is_pci_dev(struct device *dev)
40 return (dev->bus == &pci_bus_type);
43 static void ata_acpi_associate_sata_port(struct ata_port *ap)
45 acpi_integer adr = SATA_ADR(ap->port_no, NO_PORT_MULT);
47 ap->device->acpi_handle = acpi_get_child(ap->host->acpi_handle, adr);
50 static void ata_acpi_associate_ide_port(struct ata_port *ap)
54 ap->acpi_handle = acpi_get_child(ap->host->acpi_handle, ap->port_no);
59 if (ap->flags & ATA_FLAG_SLAVE_POSS)
62 for (i = 0; i < max_devices; i++) {
63 struct ata_device *dev = &ap->device[i];
65 dev->acpi_handle = acpi_get_child(ap->acpi_handle, i);
70 * ata_acpi_associate - associate ATA host with ACPI objects
71 * @host: target ATA host
73 * Look up ACPI objects associated with @host and initialize
74 * acpi_handle fields of @host, its ports and devices accordingly.
80 * 0 on success, -errno on failure.
82 void ata_acpi_associate(struct ata_host *host)
86 if (!is_pci_dev(host->dev) || libata_noacpi)
89 host->acpi_handle = DEVICE_ACPI_HANDLE(host->dev);
90 if (!host->acpi_handle)
93 for (i = 0; i < host->n_ports; i++) {
94 struct ata_port *ap = host->ports[i];
96 if (host->ports[0]->flags & ATA_FLAG_ACPI_SATA)
97 ata_acpi_associate_sata_port(ap);
99 ata_acpi_associate_ide_port(ap);
104 * ata_dev_get_GTF - get the drive bootup default taskfile settings
105 * @dev: target ATA device
106 * @gtf: output parameter for buffer containing _GTF taskfile arrays
107 * @ptr_to_free: pointer which should be freed
109 * This applies to both PATA and SATA drives.
111 * The _GTF method has no input parameters.
112 * It returns a variable number of register set values (registers
113 * hex 1F1..1F7, taskfiles).
114 * The <variable number> is not known in advance, so have ACPI-CA
115 * allocate the buffer as needed and return it, then free it later.
121 * Number of taskfiles on success, 0 if _GTF doesn't exist or doesn't
122 * contain valid data. -errno on other errors.
124 static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf,
127 struct ata_port *ap = dev->ap;
129 struct acpi_buffer output;
130 union acpi_object *out_obj;
133 /* set up output buffer */
134 output.length = ACPI_ALLOCATE_BUFFER;
135 output.pointer = NULL; /* ACPI-CA sets this; save/free it later */
137 if (ata_msg_probe(ap))
138 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
139 __FUNCTION__, ap->port_no);
141 /* _GTF has no input parameters */
142 status = acpi_evaluate_object(dev->acpi_handle, "_GTF", NULL, &output);
144 if (ACPI_FAILURE(status)) {
145 if (status != AE_NOT_FOUND) {
146 ata_dev_printk(dev, KERN_WARNING,
147 "_GTF evaluation failed (AE 0x%x)\n",
154 if (!output.length || !output.pointer) {
155 if (ata_msg_probe(ap))
156 ata_dev_printk(dev, KERN_DEBUG, "%s: Run _GTF: "
157 "length or ptr is NULL (0x%llx, 0x%p)\n",
159 (unsigned long long)output.length,
164 out_obj = output.pointer;
165 if (out_obj->type != ACPI_TYPE_BUFFER) {
166 ata_dev_printk(dev, KERN_WARNING,
167 "_GTF unexpected object type 0x%x\n",
173 if (out_obj->buffer.length % REGS_PER_GTF) {
174 ata_dev_printk(dev, KERN_WARNING,
175 "unexpected _GTF length (%d)\n",
176 out_obj->buffer.length);
181 *ptr_to_free = out_obj;
182 *gtf = (void *)out_obj->buffer.pointer;
183 rc = out_obj->buffer.length / REGS_PER_GTF;
185 if (ata_msg_probe(ap))
186 ata_dev_printk(dev, KERN_DEBUG, "%s: returning "
187 "gtf=%p, gtf_count=%d, ptr_to_free=%p\n",
188 __FUNCTION__, *gtf, rc, *ptr_to_free);
192 kfree(output.pointer);
197 * taskfile_load_raw - send taskfile registers to host controller
198 * @dev: target ATA device
199 * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
201 * Outputs ATA taskfile to standard ATA host controller using MMIO
202 * or PIO as indicated by the ATA_FLAG_MMIO flag.
203 * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
204 * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
205 * hob_lbal, hob_lbam, and hob_lbah.
207 * This function waits for idle (!BUSY and !DRQ) after writing
208 * registers. If the control register has a new value, this
209 * function also waits for idle after writing control and before
210 * writing the remaining registers.
216 * 0 on success, -errno on failure.
218 static int taskfile_load_raw(struct ata_device *dev,
219 const struct ata_acpi_gtf *gtf)
221 struct ata_port *ap = dev->ap;
222 struct ata_taskfile tf, rtf;
223 unsigned int err_mask;
225 if ((gtf->tf[0] == 0) && (gtf->tf[1] == 0) && (gtf->tf[2] == 0)
226 && (gtf->tf[3] == 0) && (gtf->tf[4] == 0) && (gtf->tf[5] == 0)
227 && (gtf->tf[6] == 0))
230 ata_tf_init(dev, &tf);
232 /* convert gtf to tf */
233 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; /* TBD */
234 tf.protocol = ATA_PROT_NODATA;
235 tf.feature = gtf->tf[0]; /* 0x1f1 */
236 tf.nsect = gtf->tf[1]; /* 0x1f2 */
237 tf.lbal = gtf->tf[2]; /* 0x1f3 */
238 tf.lbam = gtf->tf[3]; /* 0x1f4 */
239 tf.lbah = gtf->tf[4]; /* 0x1f5 */
240 tf.device = gtf->tf[5]; /* 0x1f6 */
241 tf.command = gtf->tf[6]; /* 0x1f7 */
243 if (ata_msg_probe(ap))
244 ata_dev_printk(dev, KERN_DEBUG, "executing ACPI cmd "
245 "%02x/%02x:%02x:%02x:%02x:%02x:%02x\n",
246 tf.command, tf.feature, tf.nsect,
247 tf.lbal, tf.lbam, tf.lbah, tf.device);
250 err_mask = ata_exec_internal(dev, &rtf, NULL, DMA_NONE, NULL, 0);
252 ata_dev_printk(dev, KERN_ERR,
253 "ACPI cmd %02x/%02x:%02x:%02x:%02x:%02x:%02x failed "
254 "(Emask=0x%x Stat=0x%02x Err=0x%02x)\n",
255 tf.command, tf.feature, tf.nsect, tf.lbal, tf.lbam,
256 tf.lbah, tf.device, err_mask, rtf.command, rtf.feature);
264 * ata_acpi_exec_tfs - get then write drive taskfile settings
265 * @dev: target ATA device
267 * Evaluate _GTF and excute returned taskfiles.
273 * Number of executed taskfiles on success, 0 if _GTF doesn't exist or
274 * doesn't contain valid data. -errno on other errors.
276 static int ata_acpi_exec_tfs(struct ata_device *dev)
278 struct ata_acpi_gtf *gtf = NULL;
279 void *ptr_to_free = NULL;
280 int gtf_count, i, rc;
283 rc = ata_dev_get_GTF(dev, >f, &ptr_to_free);
289 for (i = 0, rc = 0; i < gtf_count; i++) {
292 /* ACPI errors are eventually ignored. Run till the
293 * end even after errors.
295 tmp = taskfile_load_raw(dev, gtf++);
308 * ata_acpi_push_id - send Identify data to drive
309 * @dev: target ATA device
311 * _SDD ACPI object: for SATA mode only
312 * Must be after Identify (Packet) Device -- uses its data
313 * ATM this function never returns a failure. It is an optional
314 * method and if it fails for whatever reason, we should still
321 * 0 on success, -errno on failure.
323 static int ata_acpi_push_id(struct ata_device *dev)
325 struct ata_port *ap = dev->ap;
328 struct acpi_object_list input;
329 union acpi_object in_params[1];
331 if (ata_msg_probe(ap))
332 ata_dev_printk(dev, KERN_DEBUG, "%s: ix = %d, port#: %d\n",
333 __FUNCTION__, dev->devno, ap->port_no);
335 /* Give the drive Identify data to the drive via the _SDD method */
336 /* _SDD: set up input parameters */
338 input.pointer = in_params;
339 in_params[0].type = ACPI_TYPE_BUFFER;
340 in_params[0].buffer.length = sizeof(dev->id[0]) * ATA_ID_WORDS;
341 in_params[0].buffer.pointer = (u8 *)dev->id;
342 /* Output buffer: _SDD has no output */
344 /* It's OK for _SDD to be missing too. */
345 swap_buf_le16(dev->id, ATA_ID_WORDS);
346 status = acpi_evaluate_object(dev->acpi_handle, "_SDD", &input, NULL);
347 swap_buf_le16(dev->id, ATA_ID_WORDS);
349 err = ACPI_FAILURE(status) ? -EIO : 0;
351 ata_dev_printk(dev, KERN_WARNING,
352 "ACPI _SDD failed (AE 0x%x)\n", status);
358 * ata_acpi_on_resume - ATA ACPI hook called on resume
359 * @ap: target ATA port
361 * This function is called when @ap is resumed - right after port
362 * itself is resumed but before any EH action is taken.
367 void ata_acpi_on_resume(struct ata_port *ap)
372 for (i = 0; i < ATA_MAX_DEVICES; i++)
373 ap->device[i].flags |= ATA_DFLAG_ACPI_PENDING;
377 * ata_acpi_on_devcfg - ATA ACPI hook called on device donfiguration
378 * @dev: target ATA device
380 * This function is called when @dev is about to be configured.
381 * IDENTIFY data might have been modified after this hook is run.
387 * Positive number if IDENTIFY data needs to be refreshed, 0 if not,
390 int ata_acpi_on_devcfg(struct ata_device *dev)
392 struct ata_port *ap = dev->ap;
393 struct ata_eh_context *ehc = &ap->eh_context;
394 int acpi_sata = ap->flags & ATA_FLAG_ACPI_SATA;
397 /* XXX: _STM isn't implemented yet, skip if IDE for now */
401 if (!dev->acpi_handle)
404 /* do we need to do _GTF? */
405 if (!(dev->flags & ATA_DFLAG_ACPI_PENDING) &&
406 !(acpi_sata && (ehc->i.flags & ATA_EHI_DID_HARDRESET)))
409 /* do _SDD if SATA */
411 rc = ata_acpi_push_id(dev);
417 rc = ata_acpi_exec_tfs(dev);
421 dev->flags &= ~ATA_DFLAG_ACPI_PENDING;
423 /* refresh IDENTIFY page if any _GTF command has been executed */
425 rc = ata_dev_reread_id(dev, 0);
427 ata_dev_printk(dev, KERN_ERR, "failed to IDENTIFY "
428 "after ACPI commands\n");
436 /* let EH retry on the first failure, disable ACPI on the second */
437 if (dev->flags & ATA_DFLAG_ACPI_FAILED) {
438 ata_dev_printk(dev, KERN_WARNING, "ACPI on devcfg failed the "
439 "second time, disabling (errno=%d)\n", rc);
441 dev->acpi_handle = NULL;
443 /* if port is working, request IDENTIFY reload and continue */
444 if (!(ap->pflags & ATA_PFLAG_FROZEN))
447 dev->flags |= ATA_DFLAG_ACPI_FAILED;