1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ACPI PATA driver 4 * 5 * (c) 2007 Red Hat 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/module.h> 10 #include <linux/pci.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 * @link: ATA link 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 * @ap: ATA port 67 * @adev: ATA device 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 int pacpi_mode_filter(struct ata_device *adev, unsigned int 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 * @id: PCI device ID 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_SLEEP 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