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669a5db4 JG |
1 | /* |
2 | * pata_mpiix.c - Intel MPIIX PATA for new ATA layer | |
3 | * (C) 2005-2006 Red Hat Inc | |
4 | * Alan Cox <alan@redhat.com> | |
5 | * | |
6 | * The MPIIX is different enough to the PIIX4 and friends that we give it | |
7 | * a separate driver. The old ide/pci code handles this by just not tuning | |
8 | * MPIIX at all. | |
9 | * | |
10 | * The MPIIX also differs in another important way from the majority of PIIX | |
11 | * devices. The chip is a bridge (pardon the pun) between the old world of | |
12 | * ISA IDE and PCI IDE. Although the ATA timings are PCI configured the actual | |
13 | * IDE controller is not decoded in PCI space and the chip does not claim to | |
14 | * be IDE class PCI. This requires slightly non-standard probe logic compared | |
15 | * with PCI IDE and also that we do not disable the device when our driver is | |
16 | * unloaded (as it has many other functions). | |
17 | * | |
18 | * The driver conciously keeps this logic internally to avoid pushing quirky | |
19 | * PATA history into the clean libata layer. | |
20 | * | |
21 | * Thinkpad specific note: If you boot an MPIIX using thinkpad with a PCMCIA | |
22 | * hard disk present this driver will not detect it. This is not a bug. In this | |
23 | * configuration the secondary port of the MPIIX is disabled and the addresses | |
24 | * are decoded by the PCMCIA bridge and therefore are for a generic IDE driver | |
25 | * to operate. | |
26 | */ | |
27 | ||
28 | #include <linux/kernel.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/pci.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/blkdev.h> | |
33 | #include <linux/delay.h> | |
34 | #include <scsi/scsi_host.h> | |
35 | #include <linux/libata.h> | |
36 | ||
37 | #define DRV_NAME "pata_mpiix" | |
38 | #define DRV_VERSION "0.7.1" | |
39 | ||
40 | enum { | |
41 | IDETIM = 0x6C, /* IDE control register */ | |
42 | IORDY = (1 << 1), | |
43 | PPE = (1 << 2), | |
44 | FTIM = (1 << 0), | |
45 | ENABLED = (1 << 15), | |
46 | SECONDARY = (1 << 14) | |
47 | }; | |
48 | ||
49 | static int mpiix_pre_reset(struct ata_port *ap) | |
50 | { | |
51 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); | |
52 | static const struct pci_bits mpiix_enable_bits[] = { | |
53 | { 0x6D, 1, 0x80, 0x80 }, | |
54 | { 0x6F, 1, 0x80, 0x80 } | |
55 | }; | |
56 | ||
57 | if (!pci_test_config_bits(pdev, &mpiix_enable_bits[ap->port_no])) { | |
58 | ata_port_disable(ap); | |
59 | printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id); | |
60 | return 0; | |
61 | } | |
62 | ap->cbl = ATA_CBL_PATA40; | |
63 | return ata_std_prereset(ap); | |
64 | } | |
65 | ||
66 | /** | |
67 | * mpiix_error_handler - probe reset | |
68 | * @ap: ATA port | |
69 | * | |
70 | * Perform the ATA probe and bus reset sequence plus specific handling | |
71 | * for this hardware. The MPIIX has the enable bits in a different place | |
72 | * to PIIX4 and friends. As a pure PIO device it has no cable detect | |
73 | */ | |
74 | ||
75 | static void mpiix_error_handler(struct ata_port *ap) | |
76 | { | |
77 | ata_bmdma_drive_eh(ap, mpiix_pre_reset, ata_std_softreset, NULL, ata_std_postreset); | |
78 | } | |
79 | ||
80 | /** | |
81 | * mpiix_set_piomode - set initial PIO mode data | |
82 | * @ap: ATA interface | |
83 | * @adev: ATA device | |
84 | * | |
85 | * Called to do the PIO mode setup. The MPIIX allows us to program the | |
86 | * IORDY sample point (2-5 clocks), recovery 1-4 clocks and whether | |
87 | * prefetching or iordy are used. | |
88 | * | |
89 | * This would get very ugly because we can only program timing for one | |
90 | * device at a time, the other gets PIO0. Fortunately libata calls | |
91 | * our qc_issue_prot command before a command is issued so we can | |
92 | * flip the timings back and forth to reduce the pain. | |
93 | */ | |
94 | ||
95 | static void mpiix_set_piomode(struct ata_port *ap, struct ata_device *adev) | |
96 | { | |
97 | int control = 0; | |
98 | int pio = adev->pio_mode - XFER_PIO_0; | |
99 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); | |
100 | u16 idetim; | |
101 | static const /* ISP RTC */ | |
102 | u8 timings[][2] = { { 0, 0 }, | |
103 | { 0, 0 }, | |
104 | { 1, 0 }, | |
105 | { 2, 1 }, | |
106 | { 2, 3 }, }; | |
107 | ||
108 | pci_read_config_word(pdev, IDETIM, &idetim); | |
109 | /* Mask the IORDY/TIME/PPE0 bank for this device */ | |
110 | if (adev->class == ATA_DEV_ATA) | |
111 | control |= PPE; /* PPE enable for disk */ | |
112 | if (ata_pio_need_iordy(adev)) | |
113 | control |= IORDY; /* IORDY */ | |
114 | if (pio > 0) | |
115 | control |= FTIM; /* This drive is on the fast timing bank */ | |
116 | ||
117 | /* Mask out timing and clear both TIME bank selects */ | |
118 | idetim &= 0xCCEE; | |
119 | idetim &= ~(0x07 << (2 * adev->devno)); | |
120 | idetim |= (control << (2 * adev->devno)); | |
121 | ||
122 | idetim |= (timings[pio][0] << 12) | (timings[pio][1] << 8); | |
123 | pci_write_config_word(pdev, IDETIM, idetim); | |
124 | ||
125 | /* We use ap->private_data as a pointer to the device currently | |
126 | loaded for timing */ | |
127 | ap->private_data = adev; | |
128 | } | |
129 | ||
130 | /** | |
131 | * mpiix_qc_issue_prot - command issue | |
132 | * @qc: command pending | |
133 | * | |
134 | * Called when the libata layer is about to issue a command. We wrap | |
135 | * this interface so that we can load the correct ATA timings if | |
136 | * neccessary. Our logic also clears TIME0/TIME1 for the other device so | |
137 | * that, even if we get this wrong, cycles to the other device will | |
138 | * be made PIO0. | |
139 | */ | |
140 | ||
141 | static unsigned int mpiix_qc_issue_prot(struct ata_queued_cmd *qc) | |
142 | { | |
143 | struct ata_port *ap = qc->ap; | |
144 | struct ata_device *adev = qc->dev; | |
145 | ||
146 | /* If modes have been configured and the channel data is not loaded | |
147 | then load it. We have to check if pio_mode is set as the core code | |
148 | does not set adev->pio_mode to XFER_PIO_0 while probing as would be | |
149 | logical */ | |
150 | ||
151 | if (adev->pio_mode && adev != ap->private_data) | |
152 | mpiix_set_piomode(ap, adev); | |
153 | ||
154 | return ata_qc_issue_prot(qc); | |
155 | } | |
156 | ||
157 | static struct scsi_host_template mpiix_sht = { | |
158 | .module = THIS_MODULE, | |
159 | .name = DRV_NAME, | |
160 | .ioctl = ata_scsi_ioctl, | |
161 | .queuecommand = ata_scsi_queuecmd, | |
162 | .can_queue = ATA_DEF_QUEUE, | |
163 | .this_id = ATA_SHT_THIS_ID, | |
164 | .sg_tablesize = LIBATA_MAX_PRD, | |
165 | .max_sectors = ATA_MAX_SECTORS, | |
166 | .cmd_per_lun = ATA_SHT_CMD_PER_LUN, | |
167 | .emulated = ATA_SHT_EMULATED, | |
168 | .use_clustering = ATA_SHT_USE_CLUSTERING, | |
169 | .proc_name = DRV_NAME, | |
170 | .dma_boundary = ATA_DMA_BOUNDARY, | |
171 | .slave_configure = ata_scsi_slave_config, | |
172 | .bios_param = ata_std_bios_param, | |
173 | }; | |
174 | ||
175 | static struct ata_port_operations mpiix_port_ops = { | |
176 | .port_disable = ata_port_disable, | |
177 | .set_piomode = mpiix_set_piomode, | |
178 | ||
179 | .tf_load = ata_tf_load, | |
180 | .tf_read = ata_tf_read, | |
181 | .check_status = ata_check_status, | |
182 | .exec_command = ata_exec_command, | |
183 | .dev_select = ata_std_dev_select, | |
184 | ||
185 | .freeze = ata_bmdma_freeze, | |
186 | .thaw = ata_bmdma_thaw, | |
187 | .error_handler = mpiix_error_handler, | |
188 | .post_internal_cmd = ata_bmdma_post_internal_cmd, | |
189 | ||
190 | .qc_prep = ata_qc_prep, | |
191 | .qc_issue = mpiix_qc_issue_prot, | |
192 | .data_xfer = ata_pio_data_xfer, | |
193 | ||
194 | .irq_handler = ata_interrupt, | |
195 | .irq_clear = ata_bmdma_irq_clear, | |
196 | ||
197 | .port_start = ata_port_start, | |
198 | .port_stop = ata_port_stop, | |
199 | .host_stop = ata_host_stop | |
200 | }; | |
201 | ||
202 | static int mpiix_init_one(struct pci_dev *dev, const struct pci_device_id *id) | |
203 | { | |
204 | /* Single threaded by the PCI probe logic */ | |
205 | static struct ata_probe_ent probe[2]; | |
206 | static int printed_version; | |
207 | u16 idetim; | |
208 | int enabled; | |
209 | ||
210 | if (!printed_version++) | |
211 | dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n"); | |
212 | ||
213 | /* MPIIX has many functions which can be turned on or off according | |
214 | to other devices present. Make sure IDE is enabled before we try | |
215 | and use it */ | |
216 | ||
217 | pci_read_config_word(dev, IDETIM, &idetim); | |
218 | if (!(idetim & ENABLED)) | |
219 | return -ENODEV; | |
220 | ||
221 | /* We do our own plumbing to avoid leaking special cases for whacko | |
222 | ancient hardware into the core code. There are two issues to | |
223 | worry about. #1 The chip is a bridge so if in legacy mode and | |
224 | without BARs set fools the setup. #2 If you pci_disable_device | |
225 | the MPIIX your box goes castors up */ | |
226 | ||
227 | INIT_LIST_HEAD(&probe[0].node); | |
228 | probe[0].dev = pci_dev_to_dev(dev); | |
229 | probe[0].port_ops = &mpiix_port_ops; | |
230 | probe[0].sht = &mpiix_sht; | |
231 | probe[0].pio_mask = 0x1F; | |
232 | probe[0].irq = 14; | |
233 | probe[0].irq_flags = SA_SHIRQ; | |
234 | probe[0].port_flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST; | |
235 | probe[0].n_ports = 1; | |
236 | probe[0].port[0].cmd_addr = 0x1F0; | |
237 | probe[0].port[0].ctl_addr = 0x3F6; | |
238 | probe[0].port[0].altstatus_addr = 0x3F6; | |
239 | ||
240 | /* The secondary lurks at different addresses but is otherwise | |
241 | the same beastie */ | |
242 | ||
243 | INIT_LIST_HEAD(&probe[1].node); | |
244 | probe[1] = probe[0]; | |
245 | probe[1].irq = 15; | |
246 | probe[1].port[0].cmd_addr = 0x170; | |
247 | probe[1].port[0].ctl_addr = 0x376; | |
248 | probe[1].port[0].altstatus_addr = 0x376; | |
249 | ||
250 | /* Let libata fill in the port details */ | |
251 | ata_std_ports(&probe[0].port[0]); | |
252 | ata_std_ports(&probe[1].port[0]); | |
253 | ||
254 | /* Now add the port that is active */ | |
255 | enabled = (idetim & SECONDARY) ? 1 : 0; | |
256 | ||
257 | if (ata_device_add(&probe[enabled])) | |
258 | return 0; | |
259 | return -ENODEV; | |
260 | } | |
261 | ||
262 | /** | |
263 | * mpiix_remove_one - device unload | |
264 | * @pdev: PCI device being removed | |
265 | * | |
266 | * Handle an unplug/unload event for a PCI device. Unload the | |
267 | * PCI driver but do not use the default handler as we *MUST NOT* | |
268 | * disable the device as it has other functions. | |
269 | */ | |
270 | ||
271 | static void __devexit mpiix_remove_one(struct pci_dev *pdev) | |
272 | { | |
273 | struct device *dev = pci_dev_to_dev(pdev); | |
274 | struct ata_host *host = dev_get_drvdata(dev); | |
275 | ||
276 | ata_host_remove(host); | |
277 | dev_set_drvdata(dev, NULL); | |
278 | } | |
279 | ||
280 | ||
281 | ||
282 | static const struct pci_device_id mpiix[] = { | |
283 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371MX), }, | |
284 | { 0, }, | |
285 | }; | |
286 | ||
287 | static struct pci_driver mpiix_pci_driver = { | |
288 | .name = DRV_NAME, | |
289 | .id_table = mpiix, | |
290 | .probe = mpiix_init_one, | |
291 | .remove = mpiix_remove_one | |
292 | }; | |
293 | ||
294 | static int __init mpiix_init(void) | |
295 | { | |
296 | return pci_register_driver(&mpiix_pci_driver); | |
297 | } | |
298 | ||
299 | ||
300 | static void __exit mpiix_exit(void) | |
301 | { | |
302 | pci_unregister_driver(&mpiix_pci_driver); | |
303 | } | |
304 | ||
305 | ||
306 | MODULE_AUTHOR("Alan Cox"); | |
307 | MODULE_DESCRIPTION("low-level driver for Intel MPIIX"); | |
308 | MODULE_LICENSE("GPL"); | |
309 | MODULE_DEVICE_TABLE(pci, mpiix); | |
310 | MODULE_VERSION(DRV_VERSION); | |
311 | ||
312 | module_init(mpiix_init); | |
313 | module_exit(mpiix_exit); |