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/blkdev.h> 11#include <linux/delay.h> 12#include <linux/device.h> 13#include <linux/gfp.h> 14#include <linux/acpi.h> 15#include <linux/libata.h> 16#include <linux/ata.h> 17#include <scsi/scsi_host.h> 18 19#define DRV_NAME "pata_acpi" 20#define DRV_VERSION "0.2.3" 21 22struct pata_acpi { 23 struct ata_acpi_gtm gtm; 24 void *last; 25 unsigned long mask[2]; 26}; 27 28/** 29 * pacpi_pre_reset - check for 40/80 pin 30 * @ap: Port 31 * @deadline: deadline jiffies for the operation 32 * 33 * Perform the PATA port setup we need. 34 */ 35 36static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline) 37{ 38 struct ata_port *ap = link->ap; 39 struct pata_acpi *acpi = ap->private_data; 40 if (ACPI_HANDLE(&ap->tdev) == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0) 41 return -ENODEV; 42 43 return ata_sff_prereset(link, deadline); 44} 45 46/** 47 * pacpi_cable_detect - cable type detection 48 * @ap: port to detect 49 * 50 * Perform device specific cable detection 51 */ 52 53static int pacpi_cable_detect(struct ata_port *ap) 54{ 55 struct pata_acpi *acpi = ap->private_data; 56 57 if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA)) 58 return ATA_CBL_PATA80; 59 else 60 return ATA_CBL_PATA40; 61} 62 63/** 64 * pacpi_discover_modes - filter non ACPI modes 65 * @adev: ATA device 66 * @mask: proposed modes 67 * 68 * Try the modes available and see which ones the ACPI method will 69 * set up sensibly. From this we get a mask of ACPI modes we can use 70 */ 71 72static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev) 73{ 74 struct pata_acpi *acpi = ap->private_data; 75 struct ata_acpi_gtm probe; 76 unsigned int xfer_mask; 77 78 probe = acpi->gtm; 79 80 ata_acpi_gtm(ap, &probe); 81 82 xfer_mask = ata_acpi_gtm_xfermask(adev, &probe); 83 84 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA)) 85 ap->cbl = ATA_CBL_PATA80; 86 87 return xfer_mask; 88} 89 90/** 91 * pacpi_mode_filter - mode filter for ACPI 92 * @adev: device 93 * @mask: mask of valid modes 94 * 95 * Filter the valid mode list according to our own specific rules, in 96 * this case the list of discovered valid modes obtained by ACPI probing 97 */ 98 99static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask) 100{ 101 struct pata_acpi *acpi = adev->link->ap->private_data; 102 return mask & acpi->mask[adev->devno]; 103} 104 105/** 106 * pacpi_set_piomode - set initial PIO mode data 107 * @ap: ATA interface 108 * @adev: ATA device 109 */ 110 111static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev) 112{ 113 int unit = adev->devno; 114 struct pata_acpi *acpi = ap->private_data; 115 const struct ata_timing *t; 116 117 if (!(acpi->gtm.flags & 0x10)) 118 unit = 0; 119 120 /* Now stuff the nS values into the structure */ 121 t = ata_timing_find_mode(adev->pio_mode); 122 acpi->gtm.drive[unit].pio = t->cycle; 123 ata_acpi_stm(ap, &acpi->gtm); 124 /* See what mode we actually got */ 125 ata_acpi_gtm(ap, &acpi->gtm); 126} 127 128/** 129 * pacpi_set_dmamode - set initial DMA mode data 130 * @ap: ATA interface 131 * @adev: ATA device 132 */ 133 134static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev) 135{ 136 int unit = adev->devno; 137 struct pata_acpi *acpi = ap->private_data; 138 const struct ata_timing *t; 139 140 if (!(acpi->gtm.flags & 0x10)) 141 unit = 0; 142 143 /* Now stuff the nS values into the structure */ 144 t = ata_timing_find_mode(adev->dma_mode); 145 if (adev->dma_mode >= XFER_UDMA_0) { 146 acpi->gtm.drive[unit].dma = t->udma; 147 acpi->gtm.flags |= (1 << (2 * unit)); 148 } else { 149 acpi->gtm.drive[unit].dma = t->cycle; 150 acpi->gtm.flags &= ~(1 << (2 * unit)); 151 } 152 ata_acpi_stm(ap, &acpi->gtm); 153 /* See what mode we actually got */ 154 ata_acpi_gtm(ap, &acpi->gtm); 155} 156 157/** 158 * pacpi_qc_issue - command issue 159 * @qc: command pending 160 * 161 * Called when the libata layer is about to issue a command. We wrap 162 * this interface so that we can load the correct ATA timings if 163 * necessary. 164 */ 165 166static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc) 167{ 168 struct ata_port *ap = qc->ap; 169 struct ata_device *adev = qc->dev; 170 struct pata_acpi *acpi = ap->private_data; 171 172 if (acpi->gtm.flags & 0x10) 173 return ata_bmdma_qc_issue(qc); 174 175 if (adev != acpi->last) { 176 pacpi_set_piomode(ap, adev); 177 if (ata_dma_enabled(adev)) 178 pacpi_set_dmamode(ap, adev); 179 acpi->last = adev; 180 } 181 return ata_bmdma_qc_issue(qc); 182} 183 184/** 185 * pacpi_port_start - port setup 186 * @ap: ATA port being set up 187 * 188 * Use the port_start hook to maintain private control structures 189 */ 190 191static int pacpi_port_start(struct ata_port *ap) 192{ 193 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 194 struct pata_acpi *acpi; 195 196 if (ACPI_HANDLE(&ap->tdev) == NULL) 197 return -ENODEV; 198 199 acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL); 200 if (ap->private_data == NULL) 201 return -ENOMEM; 202 acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]); 203 acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]); 204 return ata_bmdma_port_start(ap); 205} 206 207static struct scsi_host_template pacpi_sht = { 208 ATA_BMDMA_SHT(DRV_NAME), 209}; 210 211static struct ata_port_operations pacpi_ops = { 212 .inherits = &ata_bmdma_port_ops, 213 .qc_issue = pacpi_qc_issue, 214 .cable_detect = pacpi_cable_detect, 215 .mode_filter = pacpi_mode_filter, 216 .set_piomode = pacpi_set_piomode, 217 .set_dmamode = pacpi_set_dmamode, 218 .prereset = pacpi_pre_reset, 219 .port_start = pacpi_port_start, 220}; 221 222 223/** 224 * pacpi_init_one - Register ACPI ATA PCI device with kernel services 225 * @pdev: PCI device to register 226 * @ent: Entry in pacpi_pci_tbl matching with @pdev 227 * 228 * Called from kernel PCI layer. 229 * 230 * LOCKING: 231 * Inherited from PCI layer (may sleep). 232 * 233 * RETURNS: 234 * Zero on success, or -ERRNO value. 235 */ 236 237static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id) 238{ 239 static const struct ata_port_info info = { 240 .flags = ATA_FLAG_SLAVE_POSS, 241 242 .pio_mask = ATA_PIO4, 243 .mwdma_mask = ATA_MWDMA2, 244 .udma_mask = ATA_UDMA6, 245 246 .port_ops = &pacpi_ops, 247 }; 248 const struct ata_port_info *ppi[] = { &info, NULL }; 249 if (pdev->vendor == PCI_VENDOR_ID_ATI) { 250 int rc = pcim_enable_device(pdev); 251 if (rc < 0) 252 return rc; 253 pcim_pin_device(pdev); 254 } 255 return ata_pci_bmdma_init_one(pdev, ppi, &pacpi_sht, NULL, 0); 256} 257 258static const struct pci_device_id pacpi_pci_tbl[] = { 259 { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1}, 260 { } /* terminate list */ 261}; 262 263static struct pci_driver pacpi_pci_driver = { 264 .name = DRV_NAME, 265 .id_table = pacpi_pci_tbl, 266 .probe = pacpi_init_one, 267 .remove = ata_pci_remove_one, 268#ifdef CONFIG_PM_SLEEP 269 .suspend = ata_pci_device_suspend, 270 .resume = ata_pci_device_resume, 271#endif 272}; 273 274module_pci_driver(pacpi_pci_driver); 275 276MODULE_AUTHOR("Alan Cox"); 277MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode"); 278MODULE_LICENSE("GPL"); 279MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl); 280MODULE_VERSION(DRV_VERSION); 281