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 "0.5.3"
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 ap->cbl = ATA_CBL_PATA40;
48 return ata_std_prereset(ap);
52 * oldpiix_pata_error_handler - Probe specified port on PATA host controller
57 * None (inherited from caller).
60 static void oldpiix_pata_error_handler(struct ata_port *ap)
62 ata_bmdma_drive_eh(ap, oldpiix_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
66 * oldpiix_set_piomode - Initialize host controller PATA PIO timings
67 * @ap: Port whose timings we are configuring
70 * Set PIO mode for device, in host controller PCI config space.
73 * None (inherited from caller).
76 static void oldpiix_set_piomode (struct ata_port *ap, struct ata_device *adev)
78 unsigned int pio = adev->pio_mode - XFER_PIO_0;
79 struct pci_dev *dev = to_pci_dev(ap->host->dev);
80 unsigned int idetm_port= ap->port_no ? 0x42 : 0x40;
85 * See Intel Document 298600-004 for the timing programing rules
86 * for PIIX/ICH. Note that the early PIIX does not have the slave
87 * timing port at 0x44.
90 static const /* ISP RTC */
91 u8 timings[][2] = { { 0, 0 },
98 control |= 1; /* TIME */
99 if (ata_pio_need_iordy(adev))
100 control |= 2; /* IE */
102 /* Intel specifies that the prefetch/posting is for disk only */
103 if (adev->class == ATA_DEV_ATA)
104 control |= 4; /* PPE */
106 pci_read_config_word(dev, idetm_port, &idetm_data);
109 * Set PPE, IE and TIME as appropriate.
110 * Clear the other drive's timing bits.
112 if (adev->devno == 0) {
113 idetm_data &= 0xCCE0;
114 idetm_data |= control;
116 idetm_data &= 0xCC0E;
117 idetm_data |= (control << 4);
119 idetm_data |= (timings[pio][0] << 12) |
120 (timings[pio][1] << 8);
121 pci_write_config_word(dev, idetm_port, idetm_data);
123 /* Track which port is configured */
124 ap->private_data = adev;
128 * oldpiix_set_dmamode - Initialize host controller PATA DMA timings
129 * @ap: Port whose timings we are configuring
130 * @adev: Device to program
131 * @isich: True if the device is an ICH and has IOCFG registers
133 * Set MWDMA mode for device, in host controller PCI config space.
136 * None (inherited from caller).
139 static void oldpiix_set_dmamode (struct ata_port *ap, struct ata_device *adev)
141 struct pci_dev *dev = to_pci_dev(ap->host->dev);
142 u8 idetm_port = ap->port_no ? 0x42 : 0x40;
145 static const /* ISP RTC */
146 u8 timings[][2] = { { 0, 0 },
153 * MWDMA is driven by the PIO timings. We must also enable
154 * IORDY unconditionally along with TIME1. PPE has already
155 * been set when the PIO timing was set.
158 unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0;
159 unsigned int control;
160 const unsigned int needed_pio[3] = {
161 XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
163 int pio = needed_pio[mwdma] - XFER_PIO_0;
165 pci_read_config_word(dev, idetm_port, &idetm_data);
167 control = 3; /* IORDY|TIME0 */
168 /* Intel specifies that the PPE functionality is for disk only */
169 if (adev->class == ATA_DEV_ATA)
170 control |= 4; /* PPE enable */
172 /* If the drive MWDMA is faster than it can do PIO then
173 we must force PIO into PIO0 */
175 if (adev->pio_mode < needed_pio[mwdma])
176 /* Enable DMA timing only */
177 control |= 8; /* PIO cycles in PIO0 */
179 /* Mask out the relevant control and timing bits we will load. Also
180 clear the other drive TIME register as a precaution */
181 if (adev->devno == 0) {
182 idetm_data &= 0xCCE0;
183 idetm_data |= control;
185 idetm_data &= 0xCC0E;
186 idetm_data |= (control << 4);
188 idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
189 pci_write_config_word(dev, idetm_port, idetm_data);
191 /* Track which port is configured */
192 ap->private_data = adev;
196 * oldpiix_qc_issue_prot - command issue
197 * @qc: command pending
199 * Called when the libata layer is about to issue a command. We wrap
200 * this interface so that we can load the correct ATA timings if
201 * neccessary. Our logic also clears TIME0/TIME1 for the other device so
202 * that, even if we get this wrong, cycles to the other device will
206 static unsigned int oldpiix_qc_issue_prot(struct ata_queued_cmd *qc)
208 struct ata_port *ap = qc->ap;
209 struct ata_device *adev = qc->dev;
211 if (adev != ap->private_data) {
213 oldpiix_set_dmamode(ap, adev);
214 else if (adev->pio_mode)
215 oldpiix_set_piomode(ap, adev);
217 return ata_qc_issue_prot(qc);
221 static struct scsi_host_template oldpiix_sht = {
222 .module = THIS_MODULE,
224 .ioctl = ata_scsi_ioctl,
225 .queuecommand = ata_scsi_queuecmd,
226 .can_queue = ATA_DEF_QUEUE,
227 .this_id = ATA_SHT_THIS_ID,
228 .sg_tablesize = LIBATA_MAX_PRD,
229 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
230 .emulated = ATA_SHT_EMULATED,
231 .use_clustering = ATA_SHT_USE_CLUSTERING,
232 .proc_name = DRV_NAME,
233 .dma_boundary = ATA_DMA_BOUNDARY,
234 .slave_configure = ata_scsi_slave_config,
235 .slave_destroy = ata_scsi_slave_destroy,
236 .bios_param = ata_std_bios_param,
237 .resume = ata_scsi_device_resume,
238 .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,
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,
269 .irq_ack = ata_irq_ack,
271 .port_start = ata_port_start,
276 * oldpiix_init_one - Register PIIX ATA PCI device with kernel services
277 * @pdev: PCI device to register
278 * @ent: Entry in oldpiix_pci_tbl matching with @pdev
280 * Called from kernel PCI layer. We probe for combined mode (sigh),
281 * and then hand over control to libata, for it to do the rest.
284 * Inherited from PCI layer (may sleep).
287 * Zero on success, or -ERRNO value.
290 static int oldpiix_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
292 static int printed_version;
293 static struct ata_port_info info = {
295 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
296 .pio_mask = 0x1f, /* pio0-4 */
297 .mwdma_mask = 0x07, /* mwdma1-2 */
298 .port_ops = &oldpiix_pata_ops,
300 static struct ata_port_info *port_info[2] = { &info, &info };
302 if (!printed_version++)
303 dev_printk(KERN_DEBUG, &pdev->dev,
304 "version " DRV_VERSION "\n");
306 return ata_pci_init_one(pdev, port_info, 2);
309 static const struct pci_device_id oldpiix_pci_tbl[] = {
310 { PCI_VDEVICE(INTEL, 0x1230), },
312 { } /* terminate list */
315 static struct pci_driver oldpiix_pci_driver = {
317 .id_table = oldpiix_pci_tbl,
318 .probe = oldpiix_init_one,
319 .remove = ata_pci_remove_one,
320 .suspend = ata_pci_device_suspend,
321 .resume = ata_pci_device_resume,
324 static int __init oldpiix_init(void)
326 return pci_register_driver(&oldpiix_pci_driver);
329 static void __exit oldpiix_exit(void)
331 pci_unregister_driver(&oldpiix_pci_driver);
334 module_init(oldpiix_init);
335 module_exit(oldpiix_exit);
337 MODULE_AUTHOR("Alan Cox");
338 MODULE_DESCRIPTION("SCSI low-level driver for early PIIX series controllers");
339 MODULE_LICENSE("GPL");
340 MODULE_DEVICE_TABLE(pci, oldpiix_pci_tbl);
341 MODULE_VERSION(DRV_VERSION);