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1 | /* | |
2 | * pata_mpiix.c - Intel MPIIX PATA for new ATA layer | |
3 | * (C) 2005-2006 Red Hat Inc | |
4 | * Alan Cox <alan@lxorguk.ukuu.org.uk> | |
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 consciously 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 a 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/blkdev.h> | |
32 | #include <linux/delay.h> | |
33 | #include <scsi/scsi_host.h> | |
34 | #include <linux/libata.h> | |
35 | ||
36 | #define DRV_NAME "pata_mpiix" | |
37 | #define DRV_VERSION "0.7.7" | |
38 | ||
39 | enum { | |
40 | IDETIM = 0x6C, /* IDE control register */ | |
41 | IORDY = (1 << 1), | |
42 | PPE = (1 << 2), | |
43 | FTIM = (1 << 0), | |
44 | ENABLED = (1 << 15), | |
45 | SECONDARY = (1 << 14) | |
46 | }; | |
47 | ||
48 | static int mpiix_pre_reset(struct ata_link *link, unsigned long deadline) | |
49 | { | |
50 | struct ata_port *ap = link->ap; | |
51 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); | |
52 | static const struct pci_bits mpiix_enable_bits = { 0x6D, 1, 0x80, 0x80 }; | |
53 | ||
54 | if (!pci_test_config_bits(pdev, &mpiix_enable_bits)) | |
55 | return -ENOENT; | |
56 | ||
57 | return ata_sff_prereset(link, deadline); | |
58 | } | |
59 | ||
60 | /** | |
61 | * mpiix_set_piomode - set initial PIO mode data | |
62 | * @ap: ATA interface | |
63 | * @adev: ATA device | |
64 | * | |
65 | * Called to do the PIO mode setup. The MPIIX allows us to program the | |
66 | * IORDY sample point (2-5 clocks), recovery (1-4 clocks) and whether | |
67 | * prefetching or IORDY are used. | |
68 | * | |
69 | * This would get very ugly because we can only program timing for one | |
70 | * device at a time, the other gets PIO0. Fortunately libata calls | |
71 | * our qc_issue command before a command is issued so we can flip the | |
72 | * timings back and forth to reduce the pain. | |
73 | */ | |
74 | ||
75 | static void mpiix_set_piomode(struct ata_port *ap, struct ata_device *adev) | |
76 | { | |
77 | int control = 0; | |
78 | int pio = adev->pio_mode - XFER_PIO_0; | |
79 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); | |
80 | u16 idetim; | |
81 | static const /* ISP RTC */ | |
82 | u8 timings[][2] = { { 0, 0 }, | |
83 | { 0, 0 }, | |
84 | { 1, 0 }, | |
85 | { 2, 1 }, | |
86 | { 2, 3 }, }; | |
87 | ||
88 | pci_read_config_word(pdev, IDETIM, &idetim); | |
89 | ||
90 | /* Mask the IORDY/TIME/PPE for this device */ | |
91 | if (adev->class == ATA_DEV_ATA) | |
92 | control |= PPE; /* Enable prefetch/posting for disk */ | |
93 | if (ata_pio_need_iordy(adev)) | |
94 | control |= IORDY; | |
95 | if (pio > 1) | |
96 | control |= FTIM; /* This drive is on the fast timing bank */ | |
97 | ||
98 | /* Mask out timing and clear both TIME bank selects */ | |
99 | idetim &= 0xCCEE; | |
100 | idetim &= ~(0x07 << (4 * adev->devno)); | |
101 | idetim |= control << (4 * adev->devno); | |
102 | ||
103 | idetim |= (timings[pio][0] << 12) | (timings[pio][1] << 8); | |
104 | pci_write_config_word(pdev, IDETIM, idetim); | |
105 | ||
106 | /* We use ap->private_data as a pointer to the device currently | |
107 | loaded for timing */ | |
108 | ap->private_data = adev; | |
109 | } | |
110 | ||
111 | /** | |
112 | * mpiix_qc_issue - command issue | |
113 | * @qc: command pending | |
114 | * | |
115 | * Called when the libata layer is about to issue a command. We wrap | |
116 | * this interface so that we can load the correct ATA timings if | |
117 | * necessary. Our logic also clears TIME0/TIME1 for the other device so | |
118 | * that, even if we get this wrong, cycles to the other device will | |
119 | * be made PIO0. | |
120 | */ | |
121 | ||
122 | static unsigned int mpiix_qc_issue(struct ata_queued_cmd *qc) | |
123 | { | |
124 | struct ata_port *ap = qc->ap; | |
125 | struct ata_device *adev = qc->dev; | |
126 | ||
127 | /* If modes have been configured and the channel data is not loaded | |
128 | then load it. We have to check if pio_mode is set as the core code | |
129 | does not set adev->pio_mode to XFER_PIO_0 while probing as would be | |
130 | logical */ | |
131 | ||
132 | if (adev->pio_mode && adev != ap->private_data) | |
133 | mpiix_set_piomode(ap, adev); | |
134 | ||
135 | return ata_sff_qc_issue(qc); | |
136 | } | |
137 | ||
138 | static struct scsi_host_template mpiix_sht = { | |
139 | ATA_PIO_SHT(DRV_NAME), | |
140 | }; | |
141 | ||
142 | static struct ata_port_operations mpiix_port_ops = { | |
143 | .inherits = &ata_sff_port_ops, | |
144 | .qc_issue = mpiix_qc_issue, | |
145 | .cable_detect = ata_cable_40wire, | |
146 | .set_piomode = mpiix_set_piomode, | |
147 | .prereset = mpiix_pre_reset, | |
148 | .sff_data_xfer = ata_sff_data_xfer32, | |
149 | }; | |
150 | ||
151 | static int mpiix_init_one(struct pci_dev *dev, const struct pci_device_id *id) | |
152 | { | |
153 | /* Single threaded by the PCI probe logic */ | |
154 | struct ata_host *host; | |
155 | struct ata_port *ap; | |
156 | void __iomem *cmd_addr, *ctl_addr; | |
157 | u16 idetim; | |
158 | int cmd, ctl, irq; | |
159 | ||
160 | ata_print_version_once(&dev->dev, DRV_VERSION); | |
161 | ||
162 | host = ata_host_alloc(&dev->dev, 1); | |
163 | if (!host) | |
164 | return -ENOMEM; | |
165 | ap = host->ports[0]; | |
166 | ||
167 | /* MPIIX has many functions which can be turned on or off according | |
168 | to other devices present. Make sure IDE is enabled before we try | |
169 | and use it */ | |
170 | ||
171 | pci_read_config_word(dev, IDETIM, &idetim); | |
172 | if (!(idetim & ENABLED)) | |
173 | return -ENODEV; | |
174 | ||
175 | /* See if it's primary or secondary channel... */ | |
176 | if (!(idetim & SECONDARY)) { | |
177 | cmd = 0x1F0; | |
178 | ctl = 0x3F6; | |
179 | irq = 14; | |
180 | } else { | |
181 | cmd = 0x170; | |
182 | ctl = 0x376; | |
183 | irq = 15; | |
184 | } | |
185 | ||
186 | cmd_addr = devm_ioport_map(&dev->dev, cmd, 8); | |
187 | ctl_addr = devm_ioport_map(&dev->dev, ctl, 1); | |
188 | if (!cmd_addr || !ctl_addr) | |
189 | return -ENOMEM; | |
190 | ||
191 | ata_port_desc(ap, "cmd 0x%x ctl 0x%x", cmd, ctl); | |
192 | ||
193 | /* We do our own plumbing to avoid leaking special cases for whacko | |
194 | ancient hardware into the core code. There are two issues to | |
195 | worry about. #1 The chip is a bridge so if in legacy mode and | |
196 | without BARs set fools the setup. #2 If you pci_disable_device | |
197 | the MPIIX your box goes castors up */ | |
198 | ||
199 | ap->ops = &mpiix_port_ops; | |
200 | ap->pio_mask = ATA_PIO4; | |
201 | ap->flags |= ATA_FLAG_SLAVE_POSS; | |
202 | ||
203 | ap->ioaddr.cmd_addr = cmd_addr; | |
204 | ap->ioaddr.ctl_addr = ctl_addr; | |
205 | ap->ioaddr.altstatus_addr = ctl_addr; | |
206 | ||
207 | /* Let libata fill in the port details */ | |
208 | ata_sff_std_ports(&ap->ioaddr); | |
209 | ||
210 | /* activate host */ | |
211 | return ata_host_activate(host, irq, ata_sff_interrupt, IRQF_SHARED, | |
212 | &mpiix_sht); | |
213 | } | |
214 | ||
215 | static const struct pci_device_id mpiix[] = { | |
216 | { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82371MX), }, | |
217 | ||
218 | { }, | |
219 | }; | |
220 | ||
221 | static struct pci_driver mpiix_pci_driver = { | |
222 | .name = DRV_NAME, | |
223 | .id_table = mpiix, | |
224 | .probe = mpiix_init_one, | |
225 | .remove = ata_pci_remove_one, | |
226 | #ifdef CONFIG_PM_SLEEP | |
227 | .suspend = ata_pci_device_suspend, | |
228 | .resume = ata_pci_device_resume, | |
229 | #endif | |
230 | }; | |
231 | ||
232 | module_pci_driver(mpiix_pci_driver); | |
233 | ||
234 | MODULE_AUTHOR("Alan Cox"); | |
235 | MODULE_DESCRIPTION("low-level driver for Intel MPIIX"); | |
236 | MODULE_LICENSE("GPL"); | |
237 | MODULE_DEVICE_TABLE(pci, mpiix); | |
238 | MODULE_VERSION(DRV_VERSION); |