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
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 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
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 "0.7.1"
41 IDETIM
= 0x6C, /* IDE control register */
49 static int mpiix_pre_reset(struct ata_port
*ap
)
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 }
57 if (!pci_test_config_bits(pdev
, &mpiix_enable_bits
[ap
->port_no
])) {
59 printk(KERN_INFO
"ata%u: port disabled. ignoring.\n", ap
->id
);
62 ap
->cbl
= ATA_CBL_PATA40
;
63 return ata_std_prereset(ap
);
67 * mpiix_error_handler - probe reset
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
75 static void mpiix_error_handler(struct ata_port
*ap
)
77 ata_bmdma_drive_eh(ap
, mpiix_pre_reset
, ata_std_softreset
, NULL
, ata_std_postreset
);
81 * mpiix_set_piomode - set initial PIO mode data
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.
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.
95 static void mpiix_set_piomode(struct ata_port
*ap
, struct ata_device
*adev
)
98 int pio
= adev
->pio_mode
- XFER_PIO_0
;
99 struct pci_dev
*pdev
= to_pci_dev(ap
->host
->dev
);
101 static const /* ISP RTC */
102 u8 timings
[][2] = { { 0, 0 },
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 */
115 control
|= FTIM
; /* This drive is on the fast timing bank */
117 /* Mask out timing and clear both TIME bank selects */
119 idetim
&= ~(0x07 << (2 * adev
->devno
));
120 idetim
|= (control
<< (2 * adev
->devno
));
122 idetim
|= (timings
[pio
][0] << 12) | (timings
[pio
][1] << 8);
123 pci_write_config_word(pdev
, IDETIM
, idetim
);
125 /* We use ap->private_data as a pointer to the device currently
127 ap
->private_data
= adev
;
131 * mpiix_qc_issue_prot - command issue
132 * @qc: command pending
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
141 static unsigned int mpiix_qc_issue_prot(struct ata_queued_cmd
*qc
)
143 struct ata_port
*ap
= qc
->ap
;
144 struct ata_device
*adev
= qc
->dev
;
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
151 if (adev
->pio_mode
&& adev
!= ap
->private_data
)
152 mpiix_set_piomode(ap
, adev
);
154 return ata_qc_issue_prot(qc
);
157 static struct scsi_host_template mpiix_sht
= {
158 .module
= THIS_MODULE
,
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
,
175 static struct ata_port_operations mpiix_port_ops
= {
176 .port_disable
= ata_port_disable
,
177 .set_piomode
= mpiix_set_piomode
,
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
,
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
,
190 .qc_prep
= ata_qc_prep
,
191 .qc_issue
= mpiix_qc_issue_prot
,
192 .data_xfer
= ata_pio_data_xfer
,
194 .irq_handler
= ata_interrupt
,
195 .irq_clear
= ata_bmdma_irq_clear
,
197 .port_start
= ata_port_start
,
198 .port_stop
= ata_port_stop
,
199 .host_stop
= ata_host_stop
202 static int mpiix_init_one(struct pci_dev
*dev
, const struct pci_device_id
*id
)
204 /* Single threaded by the PCI probe logic */
205 static struct ata_probe_ent probe
[2];
206 static int printed_version
;
210 if (!printed_version
++)
211 dev_printk(KERN_DEBUG
, &dev
->dev
, "version " DRV_VERSION
"\n");
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
217 pci_read_config_word(dev
, IDETIM
, &idetim
);
218 if (!(idetim
& ENABLED
))
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 */
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;
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;
240 /* The secondary lurks at different addresses but is otherwise
243 INIT_LIST_HEAD(&probe
[1].node
);
246 probe
[1].port
[0].cmd_addr
= 0x170;
247 probe
[1].port
[0].ctl_addr
= 0x376;
248 probe
[1].port
[0].altstatus_addr
= 0x376;
250 /* Let libata fill in the port details */
251 ata_std_ports(&probe
[0].port
[0]);
252 ata_std_ports(&probe
[1].port
[0]);
254 /* Now add the port that is active */
255 enabled
= (idetim
& SECONDARY
) ? 1 : 0;
257 if (ata_device_add(&probe
[enabled
]))
263 * mpiix_remove_one - device unload
264 * @pdev: PCI device being removed
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.
271 static void __devexit
mpiix_remove_one(struct pci_dev
*pdev
)
273 struct device
*dev
= pci_dev_to_dev(pdev
);
274 struct ata_host
*host
= dev_get_drvdata(dev
);
276 ata_host_remove(host
);
277 dev_set_drvdata(dev
, NULL
);
282 static const struct pci_device_id mpiix
[] = {
283 { PCI_DEVICE(PCI_VENDOR_ID_INTEL
, PCI_DEVICE_ID_INTEL_82371MX
), },
287 static struct pci_driver mpiix_pci_driver
= {
290 .probe
= mpiix_init_one
,
291 .remove
= mpiix_remove_one
294 static int __init
mpiix_init(void)
296 return pci_register_driver(&mpiix_pci_driver
);
300 static void __exit
mpiix_exit(void)
302 pci_unregister_driver(&mpiix_pci_driver
);
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
);
312 module_init(mpiix_init
);
313 module_exit(mpiix_exit
);