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 "0.5.5"
31 * oldpiix_pre_reset - probe begin
33 * @deadline: deadline jiffies for the operation
35 * Set up cable type and use generic probe init
38 static int oldpiix_pre_reset(struct ata_link *link, unsigned long deadline)
40 struct ata_port *ap = link->ap;
41 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
42 static const struct pci_bits oldpiix_enable_bits[] = {
43 { 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */
44 { 0x43U, 1U, 0x80UL, 0x80UL }, /* port 1 */
47 if (!pci_test_config_bits(pdev, &oldpiix_enable_bits[ap->port_no]))
50 return ata_sff_prereset(link, deadline);
54 * oldpiix_set_piomode - Initialize host controller PATA PIO timings
55 * @ap: Port whose timings we are configuring
56 * @adev: Device whose timings we are configuring
58 * Set PIO mode for device, in host controller PCI config space.
61 * None (inherited from caller).
64 static void oldpiix_set_piomode (struct ata_port *ap, struct ata_device *adev)
66 unsigned int pio = adev->pio_mode - XFER_PIO_0;
67 struct pci_dev *dev = to_pci_dev(ap->host->dev);
68 unsigned int idetm_port= ap->port_no ? 0x42 : 0x40;
73 * See Intel Document 298600-004 for the timing programing rules
74 * for PIIX/ICH. Note that the early PIIX does not have the slave
75 * timing port at 0x44.
78 static const /* ISP RTC */
79 u8 timings[][2] = { { 0, 0 },
86 control |= 1; /* TIME */
87 if (ata_pio_need_iordy(adev))
88 control |= 2; /* IE */
90 /* Intel specifies that the prefetch/posting is for disk only */
91 if (adev->class == ATA_DEV_ATA)
92 control |= 4; /* PPE */
94 pci_read_config_word(dev, idetm_port, &idetm_data);
97 * Set PPE, IE and TIME as appropriate.
98 * Clear the other drive's timing bits.
100 if (adev->devno == 0) {
101 idetm_data &= 0xCCE0;
102 idetm_data |= control;
104 idetm_data &= 0xCC0E;
105 idetm_data |= (control << 4);
107 idetm_data |= (timings[pio][0] << 12) |
108 (timings[pio][1] << 8);
109 pci_write_config_word(dev, idetm_port, idetm_data);
111 /* Track which port is configured */
112 ap->private_data = adev;
116 * oldpiix_set_dmamode - Initialize host controller PATA DMA timings
117 * @ap: Port whose timings we are configuring
118 * @adev: Device to program
119 * @isich: True if the device is an ICH and has IOCFG registers
121 * Set MWDMA mode for device, in host controller PCI config space.
124 * None (inherited from caller).
127 static void oldpiix_set_dmamode (struct ata_port *ap, struct ata_device *adev)
129 struct pci_dev *dev = to_pci_dev(ap->host->dev);
130 u8 idetm_port = ap->port_no ? 0x42 : 0x40;
133 static const /* ISP RTC */
134 u8 timings[][2] = { { 0, 0 },
141 * MWDMA is driven by the PIO timings. We must also enable
142 * IORDY unconditionally along with TIME1. PPE has already
143 * been set when the PIO timing was set.
146 unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0;
147 unsigned int control;
148 const unsigned int needed_pio[3] = {
149 XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
151 int pio = needed_pio[mwdma] - XFER_PIO_0;
153 pci_read_config_word(dev, idetm_port, &idetm_data);
155 control = 3; /* IORDY|TIME0 */
156 /* Intel specifies that the PPE functionality is for disk only */
157 if (adev->class == ATA_DEV_ATA)
158 control |= 4; /* PPE enable */
160 /* If the drive MWDMA is faster than it can do PIO then
161 we must force PIO into PIO0 */
163 if (adev->pio_mode < needed_pio[mwdma])
164 /* Enable DMA timing only */
165 control |= 8; /* PIO cycles in PIO0 */
167 /* Mask out the relevant control and timing bits we will load. Also
168 clear the other drive TIME register as a precaution */
169 if (adev->devno == 0) {
170 idetm_data &= 0xCCE0;
171 idetm_data |= control;
173 idetm_data &= 0xCC0E;
174 idetm_data |= (control << 4);
176 idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
177 pci_write_config_word(dev, idetm_port, idetm_data);
179 /* Track which port is configured */
180 ap->private_data = adev;
184 * oldpiix_qc_issue - command issue
185 * @qc: command pending
187 * Called when the libata layer is about to issue a command. We wrap
188 * this interface so that we can load the correct ATA timings if
189 * necessary. Our logic also clears TIME0/TIME1 for the other device so
190 * that, even if we get this wrong, cycles to the other device will
194 static unsigned int oldpiix_qc_issue(struct ata_queued_cmd *qc)
196 struct ata_port *ap = qc->ap;
197 struct ata_device *adev = qc->dev;
199 if (adev != ap->private_data) {
200 oldpiix_set_piomode(ap, adev);
201 if (ata_dma_enabled(adev))
202 oldpiix_set_dmamode(ap, adev);
204 return ata_sff_qc_issue(qc);
208 static struct scsi_host_template oldpiix_sht = {
209 ATA_BMDMA_SHT(DRV_NAME),
212 static struct ata_port_operations oldpiix_pata_ops = {
213 .inherits = &ata_bmdma_port_ops,
214 .qc_issue = oldpiix_qc_issue,
215 .cable_detect = ata_cable_40wire,
216 .set_piomode = oldpiix_set_piomode,
217 .set_dmamode = oldpiix_set_dmamode,
218 .prereset = oldpiix_pre_reset,
223 * oldpiix_init_one - Register PIIX ATA PCI device with kernel services
224 * @pdev: PCI device to register
225 * @ent: Entry in oldpiix_pci_tbl matching with @pdev
227 * Called from kernel PCI layer. We probe for combined mode (sigh),
228 * and then hand over control to libata, for it to do the rest.
231 * Inherited from PCI layer (may sleep).
234 * Zero on success, or -ERRNO value.
237 static int oldpiix_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
239 static int printed_version;
240 static const struct ata_port_info info = {
241 .flags = ATA_FLAG_SLAVE_POSS,
242 .pio_mask = 0x1f, /* pio0-4 */
243 .mwdma_mask = 0x07, /* mwdma1-2 */
244 .port_ops = &oldpiix_pata_ops,
246 const struct ata_port_info *ppi[] = { &info, NULL };
248 if (!printed_version++)
249 dev_printk(KERN_DEBUG, &pdev->dev,
250 "version " DRV_VERSION "\n");
252 return ata_pci_sff_init_one(pdev, ppi, &oldpiix_sht, NULL);
255 static const struct pci_device_id oldpiix_pci_tbl[] = {
256 { PCI_VDEVICE(INTEL, 0x1230), },
258 { } /* terminate list */
261 static struct pci_driver oldpiix_pci_driver = {
263 .id_table = oldpiix_pci_tbl,
264 .probe = oldpiix_init_one,
265 .remove = ata_pci_remove_one,
267 .suspend = ata_pci_device_suspend,
268 .resume = ata_pci_device_resume,
272 static int __init oldpiix_init(void)
274 return pci_register_driver(&oldpiix_pci_driver);
277 static void __exit oldpiix_exit(void)
279 pci_unregister_driver(&oldpiix_pci_driver);
282 module_init(oldpiix_init);
283 module_exit(oldpiix_exit);
285 MODULE_AUTHOR("Alan Cox");
286 MODULE_DESCRIPTION("SCSI low-level driver for early PIIX series controllers");
287 MODULE_LICENSE("GPL");
288 MODULE_DEVICE_TABLE(pci, oldpiix_pci_tbl);
289 MODULE_VERSION(DRV_VERSION);