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Linux/drivers/ata/pata_acpi.c

  1 /*
  2  *      ACPI PATA driver
  3  *
  4  *      (c) 2007 Red Hat
  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 <linux/gfp.h>
 15 #include <linux/acpi.h>
 16 #include <linux/libata.h>
 17 #include <linux/ata.h>
 18 #include <scsi/scsi_host.h>
 19 
 20 #define DRV_NAME        "pata_acpi"
 21 #define DRV_VERSION     "0.2.3"
 22 
 23 struct pata_acpi {
 24         struct ata_acpi_gtm gtm;
 25         void *last;
 26         unsigned long mask[2];
 27 };
 28 
 29 /**
 30  *      pacpi_pre_reset -       check for 40/80 pin
 31  *      @ap: Port
 32  *      @deadline: deadline jiffies for the operation
 33  *
 34  *      Perform the PATA port setup we need.
 35  */
 36 
 37 static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline)
 38 {
 39         struct ata_port *ap = link->ap;
 40         struct pata_acpi *acpi = ap->private_data;
 41         if (ACPI_HANDLE(&ap->tdev) == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0)
 42                 return -ENODEV;
 43 
 44         return ata_sff_prereset(link, deadline);
 45 }
 46 
 47 /**
 48  *      pacpi_cable_detect      -       cable type detection
 49  *      @ap: port to detect
 50  *
 51  *      Perform device specific cable detection
 52  */
 53 
 54 static int pacpi_cable_detect(struct ata_port *ap)
 55 {
 56         struct pata_acpi *acpi = ap->private_data;
 57 
 58         if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA))
 59                 return ATA_CBL_PATA80;
 60         else
 61                 return ATA_CBL_PATA40;
 62 }
 63 
 64 /**
 65  *      pacpi_discover_modes    -       filter non ACPI modes
 66  *      @adev: ATA device
 67  *      @mask: proposed modes
 68  *
 69  *      Try the modes available and see which ones the ACPI method will
 70  *      set up sensibly. From this we get a mask of ACPI modes we can use
 71  */
 72 
 73 static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
 74 {
 75         struct pata_acpi *acpi = ap->private_data;
 76         struct ata_acpi_gtm probe;
 77         unsigned int xfer_mask;
 78 
 79         probe = acpi->gtm;
 80 
 81         ata_acpi_gtm(ap, &probe);
 82 
 83         xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);
 84 
 85         if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
 86                 ap->cbl = ATA_CBL_PATA80;
 87 
 88         return xfer_mask;
 89 }
 90 
 91 /**
 92  *      pacpi_mode_filter       -       mode filter for ACPI
 93  *      @adev: device
 94  *      @mask: mask of valid modes
 95  *
 96  *      Filter the valid mode list according to our own specific rules, in
 97  *      this case the list of discovered valid modes obtained by ACPI probing
 98  */
 99 
100 static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask)
101 {
102         struct pata_acpi *acpi = adev->link->ap->private_data;
103         return mask & acpi->mask[adev->devno];
104 }
105 
106 /**
107  *      pacpi_set_piomode       -       set initial PIO mode data
108  *      @ap: ATA interface
109  *      @adev: ATA device
110  */
111 
112 static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev)
113 {
114         int unit = adev->devno;
115         struct pata_acpi *acpi = ap->private_data;
116         const struct ata_timing *t;
117 
118         if (!(acpi->gtm.flags & 0x10))
119                 unit = 0;
120 
121         /* Now stuff the nS values into the structure */
122         t = ata_timing_find_mode(adev->pio_mode);
123         acpi->gtm.drive[unit].pio = t->cycle;
124         ata_acpi_stm(ap, &acpi->gtm);
125         /* See what mode we actually got */
126         ata_acpi_gtm(ap, &acpi->gtm);
127 }
128 
129 /**
130  *      pacpi_set_dmamode       -       set initial DMA mode data
131  *      @ap: ATA interface
132  *      @adev: ATA device
133  */
134 
135 static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev)
136 {
137         int unit = adev->devno;
138         struct pata_acpi *acpi = ap->private_data;
139         const struct ata_timing *t;
140 
141         if (!(acpi->gtm.flags & 0x10))
142                 unit = 0;
143 
144         /* Now stuff the nS values into the structure */
145         t = ata_timing_find_mode(adev->dma_mode);
146         if (adev->dma_mode >= XFER_UDMA_0) {
147                 acpi->gtm.drive[unit].dma = t->udma;
148                 acpi->gtm.flags |= (1 << (2 * unit));
149         } else {
150                 acpi->gtm.drive[unit].dma = t->cycle;
151                 acpi->gtm.flags &= ~(1 << (2 * unit));
152         }
153         ata_acpi_stm(ap, &acpi->gtm);
154         /* See what mode we actually got */
155         ata_acpi_gtm(ap, &acpi->gtm);
156 }
157 
158 /**
159  *      pacpi_qc_issue  -       command issue
160  *      @qc: command pending
161  *
162  *      Called when the libata layer is about to issue a command. We wrap
163  *      this interface so that we can load the correct ATA timings if
164  *      necessary.
165  */
166 
167 static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
168 {
169         struct ata_port *ap = qc->ap;
170         struct ata_device *adev = qc->dev;
171         struct pata_acpi *acpi = ap->private_data;
172 
173         if (acpi->gtm.flags & 0x10)
174                 return ata_bmdma_qc_issue(qc);
175 
176         if (adev != acpi->last) {
177                 pacpi_set_piomode(ap, adev);
178                 if (ata_dma_enabled(adev))
179                         pacpi_set_dmamode(ap, adev);
180                 acpi->last = adev;
181         }
182         return ata_bmdma_qc_issue(qc);
183 }
184 
185 /**
186  *      pacpi_port_start        -       port setup
187  *      @ap: ATA port being set up
188  *
189  *      Use the port_start hook to maintain private control structures
190  */
191 
192 static int pacpi_port_start(struct ata_port *ap)
193 {
194         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
195         struct pata_acpi *acpi;
196 
197         if (ACPI_HANDLE(&ap->tdev) == NULL)
198                 return -ENODEV;
199 
200         acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL);
201         if (ap->private_data == NULL)
202                 return -ENOMEM;
203         acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]);
204         acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]);
205         return ata_bmdma_port_start(ap);
206 }
207 
208 static struct scsi_host_template pacpi_sht = {
209         ATA_BMDMA_SHT(DRV_NAME),
210 };
211 
212 static struct ata_port_operations pacpi_ops = {
213         .inherits               = &ata_bmdma_port_ops,
214         .qc_issue               = pacpi_qc_issue,
215         .cable_detect           = pacpi_cable_detect,
216         .mode_filter            = pacpi_mode_filter,
217         .set_piomode            = pacpi_set_piomode,
218         .set_dmamode            = pacpi_set_dmamode,
219         .prereset               = pacpi_pre_reset,
220         .port_start             = pacpi_port_start,
221 };
222 
223 
224 /**
225  *      pacpi_init_one - Register ACPI ATA PCI device with kernel services
226  *      @pdev: PCI device to register
227  *      @ent: Entry in pacpi_pci_tbl matching with @pdev
228  *
229  *      Called from kernel PCI layer.
230  *
231  *      LOCKING:
232  *      Inherited from PCI layer (may sleep).
233  *
234  *      RETURNS:
235  *      Zero on success, or -ERRNO value.
236  */
237 
238 static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
239 {
240         static const struct ata_port_info info = {
241                 .flags          = ATA_FLAG_SLAVE_POSS,
242 
243                 .pio_mask       = ATA_PIO4,
244                 .mwdma_mask     = ATA_MWDMA2,
245                 .udma_mask      = ATA_UDMA6,
246 
247                 .port_ops       = &pacpi_ops,
248         };
249         const struct ata_port_info *ppi[] = { &info, NULL };
250         if (pdev->vendor == PCI_VENDOR_ID_ATI) {
251                 int rc = pcim_enable_device(pdev);
252                 if (rc < 0)
253                         return rc;
254                 pcim_pin_device(pdev);
255         }
256         return ata_pci_bmdma_init_one(pdev, ppi, &pacpi_sht, NULL, 0);
257 }
258 
259 static const struct pci_device_id pacpi_pci_tbl[] = {
260         { PCI_ANY_ID,           PCI_ANY_ID,                        PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1},
261         { }     /* terminate list */
262 };
263 
264 static struct pci_driver pacpi_pci_driver = {
265         .name                   = DRV_NAME,
266         .id_table               = pacpi_pci_tbl,
267         .probe                  = pacpi_init_one,
268         .remove                 = ata_pci_remove_one,
269 #ifdef CONFIG_PM
270         .suspend                = ata_pci_device_suspend,
271         .resume                 = ata_pci_device_resume,
272 #endif
273 };
274 
275 module_pci_driver(pacpi_pci_driver);
276 
277 MODULE_AUTHOR("Alan Cox");
278 MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode");
279 MODULE_LICENSE("GPL");
280 MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl);
281 MODULE_VERSION(DRV_VERSION);
282 

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