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, stm: &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, stm: &probe); |
82 | |
83 | xfer_mask = ata_acpi_gtm_xfermask(dev: adev, gtm: &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(xfer_mode: adev->pio_mode); |
123 | acpi->gtm.drive[unit].pio = t->cycle; |
124 | ata_acpi_stm(ap, stm: &acpi->gtm); |
125 | /* See what mode we actually got */ |
126 | ata_acpi_gtm(ap, stm: &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(xfer_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, stm: &acpi->gtm); |
154 | /* See what mode we actually got */ |
155 | ata_acpi_gtm(ap, stm: &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(dev: &pdev->dev, size: sizeof(struct pata_acpi), GFP_KERNEL); |
201 | if (ap->private_data == NULL) |
202 | return -ENOMEM; |
203 | acpi->mask[0] = pacpi_discover_modes(ap, adev: &ap->link.device[0]); |
204 | acpi->mask[1] = pacpi_discover_modes(ap, adev: &ap->link.device[1]); |
205 | return ata_bmdma_port_start(ap); |
206 | } |
207 | |
208 | static const 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, sht: &pacpi_sht, NULL, hflags: 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 | |