4 * (c) 2007 Red Hat <alan@redhat.com>
7 #include <linux/kernel.h>
8 #include <linux/module.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>
23 #include <linux/libata.h>
24 #include <linux/ata.h>
26 #define DRV_NAME "pata_acpi"
27 #define DRV_VERSION "0.2.3"
30 struct ata_acpi_gtm gtm;
32 unsigned long mask[2];
36 * pacpi_pre_reset - check for 40/80 pin
38 * @deadline: deadline jiffies for the operation
40 * Perform the PATA port setup we need.
43 static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline)
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)
50 return ata_std_prereset(link, deadline);
54 * pacpi_cable_detect - cable type detection
57 * Perform device specific cable detection
60 static int pacpi_cable_detect(struct ata_port *ap)
62 struct pata_acpi *acpi = ap->private_data;
64 if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA))
65 return ATA_CBL_PATA80;
67 return ATA_CBL_PATA40;
71 * pacpi_error_handler - Setup and error handler
75 * None (inherited from caller).
78 static void pacpi_error_handler(struct ata_port *ap)
80 return ata_bmdma_drive_eh(ap, pacpi_pre_reset, ata_std_softreset,
81 NULL, ata_std_postreset);
84 /* Welcome to ACPI, bring a bucket */
85 static const unsigned int pio_cycle[7] = {
86 600, 383, 240, 180, 120, 100, 80
88 static const unsigned int mwdma_cycle[5] = {
89 480, 150, 120, 100, 80
91 static const unsigned int udma_cycle[7] = {
92 120, 80, 60, 45, 30, 20, 15
96 * pacpi_discover_modes - filter non ACPI modes
98 * @mask: proposed modes
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
104 static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
106 int unit = adev->devno;
107 struct pata_acpi *acpi = ap->private_data;
110 unsigned long mask = (0x7f << ATA_SHIFT_UDMA) | (0x7 << ATA_SHIFT_MWDMA) | (0x1F << ATA_SHIFT_PIO);
112 struct ata_acpi_gtm probe;
116 /* We always use the 0 slot for crap hardware */
117 if (!(probe.flags & 0x10))
120 ata_acpi_gtm(ap, &probe);
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;
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))) {
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;
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;
153 if (mask & (0xF8 << ATA_SHIFT_UDMA))
154 ap->cbl = ATA_CBL_PATA80;
159 * pacpi_mode_filter - mode filter for ACPI
161 * @mask: mask of valid modes
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
167 static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
169 struct pata_acpi *acpi = adev->link->ap->private_data;
170 return ata_pci_default_filter(adev, mask & acpi->mask[adev->devno]);
174 * pacpi_set_piomode - set initial PIO mode data
179 static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev)
181 int unit = adev->devno;
182 struct pata_acpi *acpi = ap->private_data;
184 if(!(acpi->gtm.flags & 0x10))
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);
195 * pacpi_set_dmamode - set initial DMA mode data
200 static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev)
202 int unit = adev->devno;
203 struct pata_acpi *acpi = ap->private_data;
205 if(!(acpi->gtm.flags & 0x10))
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));
213 acpi->gtm.drive[unit].dma = mwdma_cycle[adev->dma_mode - XFER_MW_DMA_0];
214 acpi->gtm.flags &= ~(1 << (2 * unit));
216 ata_acpi_stm(ap, &acpi->gtm);
217 /* See what mode we actually got */
218 ata_acpi_gtm(ap, &acpi->gtm);
222 * pacpi_qc_issue_prot - command issue
223 * @qc: command pending
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
230 static unsigned int pacpi_qc_issue_prot(struct ata_queued_cmd *qc)
232 struct ata_port *ap = qc->ap;
233 struct ata_device *adev = qc->dev;
234 struct pata_acpi *acpi = ap->private_data;
236 if (acpi->gtm.flags & 0x10)
237 return ata_qc_issue_prot(qc);
239 if (adev != acpi->last) {
240 pacpi_set_piomode(ap, adev);
242 pacpi_set_dmamode(ap, adev);
245 return ata_qc_issue_prot(qc);
249 * pacpi_port_start - port setup
250 * @ap: ATA port being set up
252 * Use the port_start hook to maintain private control structures
255 static int pacpi_port_start(struct ata_port *ap)
257 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
258 struct pata_acpi *acpi;
262 if (ap->acpi_handle == NULL)
265 acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
266 if (ap->private_data == NULL)
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);
277 static struct scsi_host_template pacpi_sht = {
278 .module = THIS_MODULE,
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,
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,
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,
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,
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,
323 /* Timeout handling */
324 .irq_handler = ata_interrupt,
325 .irq_clear = ata_bmdma_irq_clear,
326 .irq_on = ata_irq_on,
328 /* Generic PATA PCI ATA helpers */
329 .port_start = pacpi_port_start,
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
338 * Called from kernel PCI layer.
341 * Inherited from PCI layer (may sleep).
344 * Zero on success, or -ERRNO value.
347 static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
349 static const struct ata_port_info info = {
351 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
357 .port_ops = &pacpi_ops,
359 const struct ata_port_info *ppi[] = { &info, NULL };
360 return ata_pci_init_one(pdev, ppi);
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 */
368 static struct pci_driver pacpi_pci_driver = {
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,
377 static int __init pacpi_init(void)
379 return pci_register_driver(&pacpi_pci_driver);
382 static void __exit pacpi_exit(void)
384 pci_unregister_driver(&pacpi_pci_driver);
387 module_init(pacpi_init);
388 module_exit(pacpi_exit);
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);