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_std_prereset(link, deadline);
54 * oldpiix_pata_error_handler - Probe specified port on PATA host controller
59 * None (inherited from caller).
62 static void oldpiix_pata_error_handler(struct ata_port *ap)
64 ata_bmdma_drive_eh(ap, oldpiix_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
68 * oldpiix_set_piomode - Initialize host controller PATA PIO timings
69 * @ap: Port whose timings we are configuring
70 * @adev: Device whose timings we are configuring
72 * Set PIO mode for device, in host controller PCI config space.
75 * None (inherited from caller).
78 static void oldpiix_set_piomode (struct ata_port *ap, struct ata_device *adev)
80 unsigned int pio = adev->pio_mode - XFER_PIO_0;
81 struct pci_dev *dev = to_pci_dev(ap->host->dev);
82 unsigned int idetm_port= ap->port_no ? 0x42 : 0x40;
87 * See Intel Document 298600-004 for the timing programing rules
88 * for PIIX/ICH. Note that the early PIIX does not have the slave
89 * timing port at 0x44.
92 static const /* ISP RTC */
93 u8 timings[][2] = { { 0, 0 },
100 control |= 1; /* TIME */
101 if (ata_pio_need_iordy(adev))
102 control |= 2; /* IE */
104 /* Intel specifies that the prefetch/posting is for disk only */
105 if (adev->class == ATA_DEV_ATA)
106 control |= 4; /* PPE */
108 pci_read_config_word(dev, idetm_port, &idetm_data);
111 * Set PPE, IE and TIME as appropriate.
112 * Clear the other drive's timing bits.
114 if (adev->devno == 0) {
115 idetm_data &= 0xCCE0;
116 idetm_data |= control;
118 idetm_data &= 0xCC0E;
119 idetm_data |= (control << 4);
121 idetm_data |= (timings[pio][0] << 12) |
122 (timings[pio][1] << 8);
123 pci_write_config_word(dev, idetm_port, idetm_data);
125 /* Track which port is configured */
126 ap->private_data = adev;
130 * oldpiix_set_dmamode - Initialize host controller PATA DMA timings
131 * @ap: Port whose timings we are configuring
132 * @adev: Device to program
133 * @isich: True if the device is an ICH and has IOCFG registers
135 * Set MWDMA mode for device, in host controller PCI config space.
138 * None (inherited from caller).
141 static void oldpiix_set_dmamode (struct ata_port *ap, struct ata_device *adev)
143 struct pci_dev *dev = to_pci_dev(ap->host->dev);
144 u8 idetm_port = ap->port_no ? 0x42 : 0x40;
147 static const /* ISP RTC */
148 u8 timings[][2] = { { 0, 0 },
155 * MWDMA is driven by the PIO timings. We must also enable
156 * IORDY unconditionally along with TIME1. PPE has already
157 * been set when the PIO timing was set.
160 unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0;
161 unsigned int control;
162 const unsigned int needed_pio[3] = {
163 XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
165 int pio = needed_pio[mwdma] - XFER_PIO_0;
167 pci_read_config_word(dev, idetm_port, &idetm_data);
169 control = 3; /* IORDY|TIME0 */
170 /* Intel specifies that the PPE functionality is for disk only */
171 if (adev->class == ATA_DEV_ATA)
172 control |= 4; /* PPE enable */
174 /* If the drive MWDMA is faster than it can do PIO then
175 we must force PIO into PIO0 */
177 if (adev->pio_mode < needed_pio[mwdma])
178 /* Enable DMA timing only */
179 control |= 8; /* PIO cycles in PIO0 */
181 /* Mask out the relevant control and timing bits we will load. Also
182 clear the other drive TIME register as a precaution */
183 if (adev->devno == 0) {
184 idetm_data &= 0xCCE0;
185 idetm_data |= control;
187 idetm_data &= 0xCC0E;
188 idetm_data |= (control << 4);
190 idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
191 pci_write_config_word(dev, idetm_port, idetm_data);
193 /* Track which port is configured */
194 ap->private_data = adev;
198 * oldpiix_qc_issue_prot - command issue
199 * @qc: command pending
201 * Called when the libata layer is about to issue a command. We wrap
202 * this interface so that we can load the correct ATA timings if
203 * neccessary. Our logic also clears TIME0/TIME1 for the other device so
204 * that, even if we get this wrong, cycles to the other device will
208 static unsigned int oldpiix_qc_issue_prot(struct ata_queued_cmd *qc)
210 struct ata_port *ap = qc->ap;
211 struct ata_device *adev = qc->dev;
213 if (adev != ap->private_data) {
214 oldpiix_set_piomode(ap, adev);
216 oldpiix_set_dmamode(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 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
231 .emulated = ATA_SHT_EMULATED,
232 .use_clustering = ATA_SHT_USE_CLUSTERING,
233 .proc_name = DRV_NAME,
234 .dma_boundary = ATA_DMA_BOUNDARY,
235 .slave_configure = ata_scsi_slave_config,
236 .slave_destroy = ata_scsi_slave_destroy,
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,
256 .cable_detect = ata_cable_40wire,
258 .bmdma_setup = ata_bmdma_setup,
259 .bmdma_start = ata_bmdma_start,
260 .bmdma_stop = ata_bmdma_stop,
261 .bmdma_status = ata_bmdma_status,
262 .qc_prep = ata_qc_prep,
263 .qc_issue = oldpiix_qc_issue_prot,
264 .data_xfer = ata_data_xfer,
266 .irq_handler = ata_interrupt,
267 .irq_clear = ata_bmdma_irq_clear,
268 .irq_on = ata_irq_on,
270 .port_start = ata_port_start,
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 const struct ata_port_info info = {
294 .flags = ATA_FLAG_SLAVE_POSS,
295 .pio_mask = 0x1f, /* pio0-4 */
296 .mwdma_mask = 0x07, /* mwdma1-2 */
297 .port_ops = &oldpiix_pata_ops,
299 const struct ata_port_info *ppi[] = { &info, NULL };
301 if (!printed_version++)
302 dev_printk(KERN_DEBUG, &pdev->dev,
303 "version " DRV_VERSION "\n");
305 return ata_pci_init_one(pdev, ppi);
308 static const struct pci_device_id oldpiix_pci_tbl[] = {
309 { PCI_VDEVICE(INTEL, 0x1230), },
311 { } /* terminate list */
314 static struct pci_driver oldpiix_pci_driver = {
316 .id_table = oldpiix_pci_tbl,
317 .probe = oldpiix_init_one,
318 .remove = ata_pci_remove_one,
320 .suspend = ata_pci_device_suspend,
321 .resume = ata_pci_device_resume,
325 static int __init oldpiix_init(void)
327 return pci_register_driver(&oldpiix_pci_driver);
330 static void __exit oldpiix_exit(void)
332 pci_unregister_driver(&oldpiix_pci_driver);
335 module_init(oldpiix_init);
336 module_exit(oldpiix_exit);
338 MODULE_AUTHOR("Alan Cox");
339 MODULE_DESCRIPTION("SCSI low-level driver for early PIIX series controllers");
340 MODULE_LICENSE("GPL");
341 MODULE_DEVICE_TABLE(pci, oldpiix_pci_tbl);
342 MODULE_VERSION(DRV_VERSION);