2 * pata_oldpiix.c - Intel PATA/SATA controllers
4 * (C) 2005 Red Hat <alan@redhat.com>
6 * Some parts based on ata_piix.c by Jeff Garzik and others.
8 * Early PIIX differs significantly from the later PIIX as it lacks
9 * SITRE and the slave timing registers. This means that you have to
10 * set timing per channel, or be clever. Libata tells us whenever it
11 * does drive selection and we use this to reload the timings.
13 * Because of these behaviour differences PIIX gets its own driver module.
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/pci.h>
19 #include <linux/init.h>
20 #include <linux/blkdev.h>
21 #include <linux/delay.h>
22 #include <linux/device.h>
23 #include <scsi/scsi_host.h>
24 #include <linux/libata.h>
25 #include <linux/ata.h>
27 #define DRV_NAME "pata_oldpiix"
28 #define DRV_VERSION "0.5.1"
31 * oldpiix_pre_reset - probe begin
34 * Set up cable type and use generic probe init
37 static int oldpiix_pre_reset(struct ata_port
*ap
)
39 struct pci_dev
*pdev
= to_pci_dev(ap
->host
->dev
);
40 static const struct pci_bits oldpiix_enable_bits
[] = {
41 { 0x41U
, 1U, 0x80UL
, 0x80UL
}, /* port 0 */
42 { 0x43U
, 1U, 0x80UL
, 0x80UL
}, /* port 1 */
45 if (!pci_test_config_bits(pdev
, &oldpiix_enable_bits
[ap
->port_no
])) {
47 printk(KERN_INFO
"ata%u: port disabled. ignoring.\n", ap
->id
);
50 ap
->cbl
= ATA_CBL_PATA40
;
51 return ata_std_prereset(ap
);
55 * oldpiix_pata_error_handler - Probe specified port on PATA host controller
60 * None (inherited from caller).
63 static void oldpiix_pata_error_handler(struct ata_port
*ap
)
65 ata_bmdma_drive_eh(ap
, oldpiix_pre_reset
, ata_std_softreset
, NULL
, ata_std_postreset
);
69 * oldpiix_set_piomode - Initialize host controller PATA PIO timings
70 * @ap: Port whose timings we are configuring
73 * Set PIO mode for device, in host controller PCI config space.
76 * None (inherited from caller).
79 static void oldpiix_set_piomode (struct ata_port
*ap
, struct ata_device
*adev
)
81 unsigned int pio
= adev
->pio_mode
- XFER_PIO_0
;
82 struct pci_dev
*dev
= to_pci_dev(ap
->host
->dev
);
83 unsigned int idetm_port
= ap
->port_no
? 0x42 : 0x40;
88 * See Intel Document 298600-004 for the timing programing rules
89 * for PIIX/ICH. Note that the early PIIX does not have the slave
90 * timing port at 0x44.
93 static const /* ISP RTC */
94 u8 timings
[][2] = { { 0, 0 },
101 control
|= 1; /* TIME1 enable */
102 if (ata_pio_need_iordy(adev
))
103 control
|= 2; /* IE IORDY */
105 /* Intel specifies that the PPE functionality is for disk only */
106 if (adev
->class == ATA_DEV_ATA
)
107 control
|= 4; /* PPE enable */
109 pci_read_config_word(dev
, idetm_port
, &idetm_data
);
111 /* Enable PPE, IE and TIME as appropriate. Clear the other
113 if (adev
->devno
== 0) {
114 idetm_data
&= 0xCCE0;
115 idetm_data
|= control
;
117 idetm_data
&= 0xCC0E;
118 idetm_data
|= (control
<< 4);
120 idetm_data
|= (timings
[pio
][0] << 12) |
121 (timings
[pio
][1] << 8);
122 pci_write_config_word(dev
, idetm_port
, idetm_data
);
124 /* Track which port is configured */
125 ap
->private_data
= adev
;
129 * oldpiix_set_dmamode - Initialize host controller PATA DMA timings
130 * @ap: Port whose timings we are configuring
131 * @adev: Device to program
132 * @isich: True if the device is an ICH and has IOCFG registers
134 * Set MWDMA mode for device, in host controller PCI config space.
137 * None (inherited from caller).
140 static void oldpiix_set_dmamode (struct ata_port
*ap
, struct ata_device
*adev
)
142 struct pci_dev
*dev
= to_pci_dev(ap
->host
->dev
);
143 u8 idetm_port
= ap
->port_no
? 0x42 : 0x40;
146 static const /* ISP RTC */
147 u8 timings
[][2] = { { 0, 0 },
154 * MWDMA is driven by the PIO timings. We must also enable
155 * IORDY unconditionally along with TIME1. PPE has already
156 * been set when the PIO timing was set.
159 unsigned int mwdma
= adev
->dma_mode
- XFER_MW_DMA_0
;
160 unsigned int control
;
161 const unsigned int needed_pio
[3] = {
162 XFER_PIO_0
, XFER_PIO_3
, XFER_PIO_4
164 int pio
= needed_pio
[mwdma
] - XFER_PIO_0
;
166 pci_read_config_word(dev
, idetm_port
, &idetm_data
);
168 control
= 3; /* IORDY|TIME0 */
169 /* Intel specifies that the PPE functionality is for disk only */
170 if (adev
->class == ATA_DEV_ATA
)
171 control
|= 4; /* PPE enable */
173 /* If the drive MWDMA is faster than it can do PIO then
174 we must force PIO into PIO0 */
176 if (adev
->pio_mode
< needed_pio
[mwdma
])
177 /* Enable DMA timing only */
178 control
|= 8; /* PIO cycles in PIO0 */
180 /* Mask out the relevant control and timing bits we will load. Also
181 clear the other drive TIME register as a precaution */
182 if (adev
->devno
== 0) {
183 idetm_data
&= 0xCCE0;
184 idetm_data
|= control
;
186 idetm_data
&= 0xCC0E;
187 idetm_data
|= (control
<< 4);
189 idetm_data
|= (timings
[pio
][0] << 12) | (timings
[pio
][1] << 8);
190 pci_write_config_word(dev
, idetm_port
, idetm_data
);
192 /* Track which port is configured */
193 ap
->private_data
= adev
;
197 * oldpiix_qc_issue_prot - command issue
198 * @qc: command pending
200 * Called when the libata layer is about to issue a command. We wrap
201 * this interface so that we can load the correct ATA timings if
202 * neccessary. Our logic also clears TIME0/TIME1 for the other device so
203 * that, even if we get this wrong, cycles to the other device will
207 static unsigned int oldpiix_qc_issue_prot(struct ata_queued_cmd
*qc
)
209 struct ata_port
*ap
= qc
->ap
;
210 struct ata_device
*adev
= qc
->dev
;
212 if (adev
!= ap
->private_data
) {
214 oldpiix_set_dmamode(ap
, adev
);
215 else if (adev
->pio_mode
)
216 oldpiix_set_piomode(ap
, adev
);
218 return ata_qc_issue_prot(qc
);
222 static struct scsi_host_template oldpiix_sht
= {
223 .module
= THIS_MODULE
,
225 .ioctl
= ata_scsi_ioctl
,
226 .queuecommand
= ata_scsi_queuecmd
,
227 .can_queue
= ATA_DEF_QUEUE
,
228 .this_id
= ATA_SHT_THIS_ID
,
229 .sg_tablesize
= LIBATA_MAX_PRD
,
230 .max_sectors
= ATA_MAX_SECTORS
,
231 .cmd_per_lun
= ATA_SHT_CMD_PER_LUN
,
232 .emulated
= ATA_SHT_EMULATED
,
233 .use_clustering
= ATA_SHT_USE_CLUSTERING
,
234 .proc_name
= DRV_NAME
,
235 .dma_boundary
= ATA_DMA_BOUNDARY
,
236 .slave_configure
= ata_scsi_slave_config
,
237 .bios_param
= ata_std_bios_param
,
240 static const struct ata_port_operations oldpiix_pata_ops
= {
241 .port_disable
= ata_port_disable
,
242 .set_piomode
= oldpiix_set_piomode
,
243 .set_dmamode
= oldpiix_set_dmamode
,
244 .mode_filter
= ata_pci_default_filter
,
246 .tf_load
= ata_tf_load
,
247 .tf_read
= ata_tf_read
,
248 .check_status
= ata_check_status
,
249 .exec_command
= ata_exec_command
,
250 .dev_select
= ata_std_dev_select
,
252 .freeze
= ata_bmdma_freeze
,
253 .thaw
= ata_bmdma_thaw
,
254 .error_handler
= oldpiix_pata_error_handler
,
255 .post_internal_cmd
= ata_bmdma_post_internal_cmd
,
257 .bmdma_setup
= ata_bmdma_setup
,
258 .bmdma_start
= ata_bmdma_start
,
259 .bmdma_stop
= ata_bmdma_stop
,
260 .bmdma_status
= ata_bmdma_status
,
261 .qc_prep
= ata_qc_prep
,
262 .qc_issue
= oldpiix_qc_issue_prot
,
263 .data_xfer
= ata_pio_data_xfer
,
265 .irq_handler
= ata_interrupt
,
266 .irq_clear
= ata_bmdma_irq_clear
,
268 .port_start
= ata_port_start
,
269 .port_stop
= ata_port_stop
,
270 .host_stop
= ata_host_stop
,
275 * oldpiix_init_one - Register PIIX ATA PCI device with kernel services
276 * @pdev: PCI device to register
277 * @ent: Entry in oldpiix_pci_tbl matching with @pdev
279 * Called from kernel PCI layer. We probe for combined mode (sigh),
280 * and then hand over control to libata, for it to do the rest.
283 * Inherited from PCI layer (may sleep).
286 * Zero on success, or -ERRNO value.
289 static int oldpiix_init_one (struct pci_dev
*pdev
, const struct pci_device_id
*ent
)
291 static int printed_version
;
292 static struct ata_port_info info
= {
294 .flags
= ATA_FLAG_SLAVE_POSS
| ATA_FLAG_SRST
,
295 .pio_mask
= 0x1f, /* pio0-4 */
296 .mwdma_mask
= 0x07, /* mwdma1-2 */
297 .port_ops
= &oldpiix_pata_ops
,
299 static struct ata_port_info
*port_info
[2] = { &info
, &info
};
301 if (!printed_version
++)
302 dev_printk(KERN_DEBUG
, &pdev
->dev
,
303 "version " DRV_VERSION
"\n");
305 return ata_pci_init_one(pdev
, port_info
, 2);
308 static const struct pci_device_id oldpiix_pci_tbl
[] = {
309 { PCI_DEVICE(0x8086, 0x1230), },
310 { } /* terminate list */
313 static struct pci_driver oldpiix_pci_driver
= {
315 .id_table
= oldpiix_pci_tbl
,
316 .probe
= oldpiix_init_one
,
317 .remove
= ata_pci_remove_one
,
320 static int __init
oldpiix_init(void)
322 return pci_register_driver(&oldpiix_pci_driver
);
325 static void __exit
oldpiix_exit(void)
327 pci_unregister_driver(&oldpiix_pci_driver
);
331 module_init(oldpiix_init
);
332 module_exit(oldpiix_exit
);
334 MODULE_AUTHOR("Alan Cox");
335 MODULE_DESCRIPTION("SCSI low-level driver for early PIIX series controllers");
336 MODULE_LICENSE("GPL");
337 MODULE_DEVICE_TABLE(pci
, oldpiix_pci_tbl
);
338 MODULE_VERSION(DRV_VERSION
);