usb: avoid redundant cast of kmalloc() return value in OTi-6858 driver
[pv_ops_mirror.git] / drivers / ata / pata_mpiix.c
blob4ea42838297e68701343d86e7b05cd727b801128
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>
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.
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).
18 * The driver conciously keeps this logic internally to avoid pushing quirky
19 * PATA history into the clean libata layer.
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.
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>
37 #define DRV_NAME "pata_mpiix"
38 #define DRV_VERSION "0.7.6"
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)
49 static int mpiix_pre_reset(struct ata_port *ap, unsigned long deadline)
51 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
52 static const struct pci_bits mpiix_enable_bits = { 0x6D, 1, 0x80, 0x80 };
54 if (!pci_test_config_bits(pdev, &mpiix_enable_bits))
55 return -ENOENT;
57 return ata_std_prereset(ap, deadline);
60 /**
61 * mpiix_error_handler - probe reset
62 * @ap: ATA port
64 * Perform the ATA probe and bus reset sequence plus specific handling
65 * for this hardware. The MPIIX has the enable bits in a different place
66 * to PIIX4 and friends. As a pure PIO device it has no cable detect
69 static void mpiix_error_handler(struct ata_port *ap)
71 ata_bmdma_drive_eh(ap, mpiix_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
74 /**
75 * mpiix_set_piomode - set initial PIO mode data
76 * @ap: ATA interface
77 * @adev: ATA device
79 * Called to do the PIO mode setup. The MPIIX allows us to program the
80 * IORDY sample point (2-5 clocks), recovery (1-4 clocks) and whether
81 * prefetching or IORDY are used.
83 * This would get very ugly because we can only program timing for one
84 * device at a time, the other gets PIO0. Fortunately libata calls
85 * our qc_issue_prot command before a command is issued so we can
86 * flip the timings back and forth to reduce the pain.
89 static void mpiix_set_piomode(struct ata_port *ap, struct ata_device *adev)
91 int control = 0;
92 int pio = adev->pio_mode - XFER_PIO_0;
93 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
94 u16 idetim;
95 static const /* ISP RTC */
96 u8 timings[][2] = { { 0, 0 },
97 { 0, 0 },
98 { 1, 0 },
99 { 2, 1 },
100 { 2, 3 }, };
102 pci_read_config_word(pdev, IDETIM, &idetim);
104 /* Mask the IORDY/TIME/PPE for this device */
105 if (adev->class == ATA_DEV_ATA)
106 control |= PPE; /* Enable prefetch/posting for disk */
107 if (ata_pio_need_iordy(adev))
108 control |= IORDY;
109 if (pio > 1)
110 control |= FTIM; /* This drive is on the fast timing bank */
112 /* Mask out timing and clear both TIME bank selects */
113 idetim &= 0xCCEE;
114 idetim &= ~(0x07 << (4 * adev->devno));
115 idetim |= control << (4 * adev->devno);
117 idetim |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
118 pci_write_config_word(pdev, IDETIM, idetim);
120 /* We use ap->private_data as a pointer to the device currently
121 loaded for timing */
122 ap->private_data = adev;
126 * mpiix_qc_issue_prot - command issue
127 * @qc: command pending
129 * Called when the libata layer is about to issue a command. We wrap
130 * this interface so that we can load the correct ATA timings if
131 * neccessary. Our logic also clears TIME0/TIME1 for the other device so
132 * that, even if we get this wrong, cycles to the other device will
133 * be made PIO0.
136 static unsigned int mpiix_qc_issue_prot(struct ata_queued_cmd *qc)
138 struct ata_port *ap = qc->ap;
139 struct ata_device *adev = qc->dev;
141 /* If modes have been configured and the channel data is not loaded
142 then load it. We have to check if pio_mode is set as the core code
143 does not set adev->pio_mode to XFER_PIO_0 while probing as would be
144 logical */
146 if (adev->pio_mode && adev != ap->private_data)
147 mpiix_set_piomode(ap, adev);
149 return ata_qc_issue_prot(qc);
152 static struct scsi_host_template mpiix_sht = {
153 .module = THIS_MODULE,
154 .name = DRV_NAME,
155 .ioctl = ata_scsi_ioctl,
156 .queuecommand = ata_scsi_queuecmd,
157 .can_queue = ATA_DEF_QUEUE,
158 .this_id = ATA_SHT_THIS_ID,
159 .sg_tablesize = LIBATA_MAX_PRD,
160 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
161 .emulated = ATA_SHT_EMULATED,
162 .use_clustering = ATA_SHT_USE_CLUSTERING,
163 .proc_name = DRV_NAME,
164 .dma_boundary = ATA_DMA_BOUNDARY,
165 .slave_configure = ata_scsi_slave_config,
166 .slave_destroy = ata_scsi_slave_destroy,
167 .bios_param = ata_std_bios_param,
170 static struct ata_port_operations mpiix_port_ops = {
171 .port_disable = ata_port_disable,
172 .set_piomode = mpiix_set_piomode,
174 .tf_load = ata_tf_load,
175 .tf_read = ata_tf_read,
176 .check_status = ata_check_status,
177 .exec_command = ata_exec_command,
178 .dev_select = ata_std_dev_select,
180 .freeze = ata_bmdma_freeze,
181 .thaw = ata_bmdma_thaw,
182 .error_handler = mpiix_error_handler,
183 .post_internal_cmd = ata_bmdma_post_internal_cmd,
184 .cable_detect = ata_cable_40wire,
186 .qc_prep = ata_qc_prep,
187 .qc_issue = mpiix_qc_issue_prot,
188 .data_xfer = ata_data_xfer,
190 .irq_clear = ata_bmdma_irq_clear,
191 .irq_on = ata_irq_on,
192 .irq_ack = ata_irq_ack,
194 .port_start = ata_port_start,
197 static int mpiix_init_one(struct pci_dev *dev, const struct pci_device_id *id)
199 /* Single threaded by the PCI probe logic */
200 static int printed_version;
201 struct ata_host *host;
202 struct ata_port *ap;
203 void __iomem *cmd_addr, *ctl_addr;
204 u16 idetim;
205 int irq;
207 if (!printed_version++)
208 dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
210 host = ata_host_alloc(&dev->dev, 1);
211 if (!host)
212 return -ENOMEM;
214 /* MPIIX has many functions which can be turned on or off according
215 to other devices present. Make sure IDE is enabled before we try
216 and use it */
218 pci_read_config_word(dev, IDETIM, &idetim);
219 if (!(idetim & ENABLED))
220 return -ENODEV;
222 /* See if it's primary or secondary channel... */
223 if (!(idetim & SECONDARY)) {
224 irq = 14;
225 cmd_addr = devm_ioport_map(&dev->dev, 0x1F0, 8);
226 ctl_addr = devm_ioport_map(&dev->dev, 0x3F6, 1);
227 } else {
228 irq = 15;
229 cmd_addr = devm_ioport_map(&dev->dev, 0x170, 8);
230 ctl_addr = devm_ioport_map(&dev->dev, 0x376, 1);
233 if (!cmd_addr || !ctl_addr)
234 return -ENOMEM;
236 /* We do our own plumbing to avoid leaking special cases for whacko
237 ancient hardware into the core code. There are two issues to
238 worry about. #1 The chip is a bridge so if in legacy mode and
239 without BARs set fools the setup. #2 If you pci_disable_device
240 the MPIIX your box goes castors up */
242 ap = host->ports[0];
243 ap->ops = &mpiix_port_ops;
244 ap->pio_mask = 0x1F;
245 ap->flags |= ATA_FLAG_SLAVE_POSS;
247 ap->ioaddr.cmd_addr = cmd_addr;
248 ap->ioaddr.ctl_addr = ctl_addr;
249 ap->ioaddr.altstatus_addr = ctl_addr;
251 /* Let libata fill in the port details */
252 ata_std_ports(&ap->ioaddr);
254 /* activate host */
255 return ata_host_activate(host, irq, ata_interrupt, IRQF_SHARED,
256 &mpiix_sht);
259 static const struct pci_device_id mpiix[] = {
260 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82371MX), },
262 { },
265 static struct pci_driver mpiix_pci_driver = {
266 .name = DRV_NAME,
267 .id_table = mpiix,
268 .probe = mpiix_init_one,
269 .remove = ata_pci_remove_one,
270 #ifdef CONFIG_PM
271 .suspend = ata_pci_device_suspend,
272 .resume = ata_pci_device_resume,
273 #endif
276 static int __init mpiix_init(void)
278 return pci_register_driver(&mpiix_pci_driver);
281 static void __exit mpiix_exit(void)
283 pci_unregister_driver(&mpiix_pci_driver);
286 MODULE_AUTHOR("Alan Cox");
287 MODULE_DESCRIPTION("low-level driver for Intel MPIIX");
288 MODULE_LICENSE("GPL");
289 MODULE_DEVICE_TABLE(pci, mpiix);
290 MODULE_VERSION(DRV_VERSION);
292 module_init(mpiix_init);
293 module_exit(mpiix_exit);