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
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 return ata_std_prereset(ap);
51 * oldpiix_pata_error_handler - Probe specified port on PATA host controller
56 * None (inherited from caller).
59 static void oldpiix_pata_error_handler(struct ata_port *ap)
61 ata_bmdma_drive_eh(ap, oldpiix_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
65 * oldpiix_set_piomode - Initialize host controller PATA PIO timings
66 * @ap: Port whose timings we are configuring
67 * @adev: Device whose timings we are configuring
69 * Set PIO mode for device, in host controller PCI config space.
72 * None (inherited from caller).
75 static void oldpiix_set_piomode (struct ata_port *ap, struct ata_device *adev)
77 unsigned int pio = adev->pio_mode - XFER_PIO_0;
78 struct pci_dev *dev = to_pci_dev(ap->host->dev);
79 unsigned int idetm_port= ap->port_no ? 0x42 : 0x40;
84 * See Intel Document 298600-004 for the timing programing rules
85 * for PIIX/ICH. Note that the early PIIX does not have the slave
86 * timing port at 0x44.
89 static const /* ISP RTC */
90 u8 timings[][2] = { { 0, 0 },
97 control |= 1; /* TIME */
98 if (ata_pio_need_iordy(adev))
99 control |= 2; /* IE */
101 /* Intel specifies that the prefetch/posting is for disk only */
102 if (adev->class == ATA_DEV_ATA)
103 control |= 4; /* PPE */
105 pci_read_config_word(dev, idetm_port, &idetm_data);
108 * Set PPE, IE and TIME as appropriate.
109 * Clear the other drive's timing bits.
111 if (adev->devno == 0) {
112 idetm_data &= 0xCCE0;
113 idetm_data |= control;
115 idetm_data &= 0xCC0E;
116 idetm_data |= (control << 4);
118 idetm_data |= (timings[pio][0] << 12) |
119 (timings[pio][1] << 8);
120 pci_write_config_word(dev, idetm_port, idetm_data);
122 /* Track which port is configured */
123 ap->private_data = adev;
127 * oldpiix_set_dmamode - Initialize host controller PATA DMA timings
128 * @ap: Port whose timings we are configuring
129 * @adev: Device to program
130 * @isich: True if the device is an ICH and has IOCFG registers
132 * Set MWDMA mode for device, in host controller PCI config space.
135 * None (inherited from caller).
138 static void oldpiix_set_dmamode (struct ata_port *ap, struct ata_device *adev)
140 struct pci_dev *dev = to_pci_dev(ap->host->dev);
141 u8 idetm_port = ap->port_no ? 0x42 : 0x40;
144 static const /* ISP RTC */
145 u8 timings[][2] = { { 0, 0 },
152 * MWDMA is driven by the PIO timings. We must also enable
153 * IORDY unconditionally along with TIME1. PPE has already
154 * been set when the PIO timing was set.
157 unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0;
158 unsigned int control;
159 const unsigned int needed_pio[3] = {
160 XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
162 int pio = needed_pio[mwdma] - XFER_PIO_0;
164 pci_read_config_word(dev, idetm_port, &idetm_data);
166 control = 3; /* IORDY|TIME0 */
167 /* Intel specifies that the PPE functionality is for disk only */
168 if (adev->class == ATA_DEV_ATA)
169 control |= 4; /* PPE enable */
171 /* If the drive MWDMA is faster than it can do PIO then
172 we must force PIO into PIO0 */
174 if (adev->pio_mode < needed_pio[mwdma])
175 /* Enable DMA timing only */
176 control |= 8; /* PIO cycles in PIO0 */
178 /* Mask out the relevant control and timing bits we will load. Also
179 clear the other drive TIME register as a precaution */
180 if (adev->devno == 0) {
181 idetm_data &= 0xCCE0;
182 idetm_data |= control;
184 idetm_data &= 0xCC0E;
185 idetm_data |= (control << 4);
187 idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
188 pci_write_config_word(dev, idetm_port, idetm_data);
190 /* Track which port is configured */
191 ap->private_data = adev;
195 * oldpiix_qc_issue_prot - command issue
196 * @qc: command pending
198 * Called when the libata layer is about to issue a command. We wrap
199 * this interface so that we can load the correct ATA timings if
200 * neccessary. Our logic also clears TIME0/TIME1 for the other device so
201 * that, even if we get this wrong, cycles to the other device will
205 static unsigned int oldpiix_qc_issue_prot(struct ata_queued_cmd *qc)
207 struct ata_port *ap = qc->ap;
208 struct ata_device *adev = qc->dev;
210 if (adev != ap->private_data) {
211 oldpiix_set_piomode(ap, adev);
213 oldpiix_set_dmamode(ap, adev);
215 return ata_qc_issue_prot(qc);
219 static struct scsi_host_template oldpiix_sht = {
220 .module = THIS_MODULE,
222 .ioctl = ata_scsi_ioctl,
223 .queuecommand = ata_scsi_queuecmd,
224 .can_queue = ATA_DEF_QUEUE,
225 .this_id = ATA_SHT_THIS_ID,
226 .sg_tablesize = LIBATA_MAX_PRD,
227 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
228 .emulated = ATA_SHT_EMULATED,
229 .use_clustering = ATA_SHT_USE_CLUSTERING,
230 .proc_name = DRV_NAME,
231 .dma_boundary = ATA_DMA_BOUNDARY,
232 .slave_configure = ata_scsi_slave_config,
233 .slave_destroy = ata_scsi_slave_destroy,
234 .bios_param = ata_std_bios_param,
236 .resume = ata_scsi_device_resume,
237 .suspend = ata_scsi_device_suspend,
241 static const struct ata_port_operations oldpiix_pata_ops = {
242 .port_disable = ata_port_disable,
243 .set_piomode = oldpiix_set_piomode,
244 .set_dmamode = oldpiix_set_dmamode,
245 .mode_filter = ata_pci_default_filter,
247 .tf_load = ata_tf_load,
248 .tf_read = ata_tf_read,
249 .check_status = ata_check_status,
250 .exec_command = ata_exec_command,
251 .dev_select = ata_std_dev_select,
253 .freeze = ata_bmdma_freeze,
254 .thaw = ata_bmdma_thaw,
255 .error_handler = oldpiix_pata_error_handler,
256 .post_internal_cmd = ata_bmdma_post_internal_cmd,
257 .cable_detect = ata_cable_40wire,
259 .bmdma_setup = ata_bmdma_setup,
260 .bmdma_start = ata_bmdma_start,
261 .bmdma_stop = ata_bmdma_stop,
262 .bmdma_status = ata_bmdma_status,
263 .qc_prep = ata_qc_prep,
264 .qc_issue = oldpiix_qc_issue_prot,
265 .data_xfer = ata_data_xfer,
267 .irq_handler = ata_interrupt,
268 .irq_clear = ata_bmdma_irq_clear,
269 .irq_on = ata_irq_on,
270 .irq_ack = ata_irq_ack,
272 .port_start = ata_port_start,
277 * oldpiix_init_one - Register PIIX ATA PCI device with kernel services
278 * @pdev: PCI device to register
279 * @ent: Entry in oldpiix_pci_tbl matching with @pdev
281 * Called from kernel PCI layer. We probe for combined mode (sigh),
282 * and then hand over control to libata, for it to do the rest.
285 * Inherited from PCI layer (may sleep).
288 * Zero on success, or -ERRNO value.
291 static int oldpiix_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
293 static int printed_version;
294 static struct ata_port_info info = {
296 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
297 .pio_mask = 0x1f, /* pio0-4 */
298 .mwdma_mask = 0x07, /* mwdma1-2 */
299 .port_ops = &oldpiix_pata_ops,
301 static struct ata_port_info *port_info[2] = { &info, &info };
303 if (!printed_version++)
304 dev_printk(KERN_DEBUG, &pdev->dev,
305 "version " DRV_VERSION "\n");
307 return ata_pci_init_one(pdev, port_info, 2);
310 static const struct pci_device_id oldpiix_pci_tbl[] = {
311 { PCI_VDEVICE(INTEL, 0x1230), },
313 { } /* terminate list */
316 static struct pci_driver oldpiix_pci_driver = {
318 .id_table = oldpiix_pci_tbl,
319 .probe = oldpiix_init_one,
320 .remove = ata_pci_remove_one,
322 .suspend = ata_pci_device_suspend,
323 .resume = ata_pci_device_resume,
327 static int __init oldpiix_init(void)
329 return pci_register_driver(&oldpiix_pci_driver);
332 static void __exit oldpiix_exit(void)
334 pci_unregister_driver(&oldpiix_pci_driver);
337 module_init(oldpiix_init);
338 module_exit(oldpiix_exit);
340 MODULE_AUTHOR("Alan Cox");
341 MODULE_DESCRIPTION("SCSI low-level driver for early PIIX series controllers");
342 MODULE_LICENSE("GPL");
343 MODULE_DEVICE_TABLE(pci, oldpiix_pci_tbl);
344 MODULE_VERSION(DRV_VERSION);