2 * pata_efar.c - EFAR PIIX clone controller driver
4 * (C) 2005 Red Hat <alan@redhat.com>
6 * Some parts based on ata_piix.c by Jeff Garzik and others.
8 * The EFAR is a PIIX4 clone with UDMA66 support. Unlike the later
9 * Intel ICH controllers the EFAR widened the UDMA mode register bits
10 * and doesn't require the funky clock selection.
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/pci.h>
16 #include <linux/init.h>
17 #include <linux/blkdev.h>
18 #include <linux/delay.h>
19 #include <linux/device.h>
20 #include <scsi/scsi_host.h>
21 #include <linux/libata.h>
22 #include <linux/ata.h>
24 #define DRV_NAME "pata_efar"
25 #define DRV_VERSION "0.4.4"
28 * efar_pre_reset - Enable bits
30 * @deadline: deadline jiffies for the operation
32 * Perform cable detection for the EFAR ATA interface. This is
33 * different to the PIIX arrangement
36 static int efar_pre_reset(struct ata_link *link, unsigned long deadline)
38 static const struct pci_bits efar_enable_bits[] = {
39 { 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */
40 { 0x43U, 1U, 0x80UL, 0x80UL }, /* port 1 */
42 struct ata_port *ap = link->ap;
43 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
45 if (!pci_test_config_bits(pdev, &efar_enable_bits[ap->port_no]))
48 return ata_std_prereset(link, deadline);
52 * efar_probe_reset - Probe specified port on PATA host controller
56 * None (inherited from caller).
59 static void efar_error_handler(struct ata_port *ap)
61 ata_bmdma_drive_eh(ap, efar_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
65 * efar_cable_detect - check for 40/80 pin
68 * Perform cable detection for the EFAR ATA interface. This is
69 * different to the PIIX arrangement
72 static int efar_cable_detect(struct ata_port *ap)
74 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
77 pci_read_config_byte(pdev, 0x47, &tmp);
78 if (tmp & (2 >> ap->port_no))
79 return ATA_CBL_PATA40;
80 return ATA_CBL_PATA80;
84 * efar_set_piomode - Initialize host controller PATA PIO timings
85 * @ap: Port whose timings we are configuring
88 * Set PIO mode for device, in host controller PCI config space.
91 * None (inherited from caller).
94 static void efar_set_piomode (struct ata_port *ap, struct ata_device *adev)
96 unsigned int pio = adev->pio_mode - XFER_PIO_0;
97 struct pci_dev *dev = to_pci_dev(ap->host->dev);
98 unsigned int idetm_port= ap->port_no ? 0x42 : 0x40;
103 * See Intel Document 298600-004 for the timing programing rules
104 * for PIIX/ICH. The EFAR is a clone so very similar
107 static const /* ISP RTC */
108 u8 timings[][2] = { { 0, 0 },
115 control |= 1; /* TIME1 enable */
116 if (ata_pio_need_iordy(adev)) /* PIO 3/4 require IORDY */
117 control |= 2; /* IE enable */
118 /* Intel specifies that the PPE functionality is for disk only */
119 if (adev->class == ATA_DEV_ATA)
120 control |= 4; /* PPE enable */
122 pci_read_config_word(dev, idetm_port, &idetm_data);
124 /* Enable PPE, IE and TIME as appropriate */
126 if (adev->devno == 0) {
127 idetm_data &= 0xCCF0;
128 idetm_data |= control;
129 idetm_data |= (timings[pio][0] << 12) |
130 (timings[pio][1] << 8);
132 int shift = 4 * ap->port_no;
135 idetm_data &= 0xCC0F;
136 idetm_data |= (control << 4);
138 /* Slave timing in seperate register */
139 pci_read_config_byte(dev, 0x44, &slave_data);
140 slave_data &= 0x0F << shift;
141 slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << shift;
142 pci_write_config_byte(dev, 0x44, slave_data);
145 idetm_data |= 0x4000; /* Ensure SITRE is enabled */
146 pci_write_config_word(dev, idetm_port, idetm_data);
150 * efar_set_dmamode - Initialize host controller PATA DMA timings
151 * @ap: Port whose timings we are configuring
152 * @adev: Device to program
154 * Set UDMA/MWDMA mode for device, in host controller PCI config space.
157 * None (inherited from caller).
160 static void efar_set_dmamode (struct ata_port *ap, struct ata_device *adev)
162 struct pci_dev *dev = to_pci_dev(ap->host->dev);
163 u8 master_port = ap->port_no ? 0x42 : 0x40;
165 u8 speed = adev->dma_mode;
166 int devid = adev->devno + 2 * ap->port_no;
169 static const /* ISP RTC */
170 u8 timings[][2] = { { 0, 0 },
176 pci_read_config_word(dev, master_port, &master_data);
177 pci_read_config_byte(dev, 0x48, &udma_enable);
179 if (speed >= XFER_UDMA_0) {
180 unsigned int udma = adev->dma_mode - XFER_UDMA_0;
183 udma_enable |= (1 << devid);
185 /* Load the UDMA mode number */
186 pci_read_config_word(dev, 0x4A, &udma_timing);
187 udma_timing &= ~(7 << (4 * devid));
188 udma_timing |= udma << (4 * devid);
189 pci_write_config_word(dev, 0x4A, udma_timing);
192 * MWDMA is driven by the PIO timings. We must also enable
193 * IORDY unconditionally along with TIME1. PPE has already
194 * been set when the PIO timing was set.
196 unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0;
197 unsigned int control;
199 const unsigned int needed_pio[3] = {
200 XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
202 int pio = needed_pio[mwdma] - XFER_PIO_0;
204 control = 3; /* IORDY|TIME1 */
206 /* If the drive MWDMA is faster than it can do PIO then
207 we must force PIO into PIO0 */
209 if (adev->pio_mode < needed_pio[mwdma])
210 /* Enable DMA timing only */
211 control |= 8; /* PIO cycles in PIO0 */
213 if (adev->devno) { /* Slave */
214 master_data &= 0xFF4F; /* Mask out IORDY|TIME1|DMAONLY */
215 master_data |= control << 4;
216 pci_read_config_byte(dev, 0x44, &slave_data);
217 slave_data &= (0x0F + 0xE1 * ap->port_no);
218 /* Load the matching timing */
219 slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);
220 pci_write_config_byte(dev, 0x44, slave_data);
221 } else { /* Master */
222 master_data &= 0xCCF4; /* Mask out IORDY|TIME1|DMAONLY
223 and master timing bits */
224 master_data |= control;
226 (timings[pio][0] << 12) |
227 (timings[pio][1] << 8);
229 udma_enable &= ~(1 << devid);
230 pci_write_config_word(dev, master_port, master_data);
232 pci_write_config_byte(dev, 0x48, udma_enable);
235 static struct scsi_host_template efar_sht = {
236 .module = THIS_MODULE,
238 .ioctl = ata_scsi_ioctl,
239 .queuecommand = ata_scsi_queuecmd,
240 .can_queue = ATA_DEF_QUEUE,
241 .this_id = ATA_SHT_THIS_ID,
242 .sg_tablesize = LIBATA_MAX_PRD,
243 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
244 .emulated = ATA_SHT_EMULATED,
245 .use_clustering = ATA_SHT_USE_CLUSTERING,
246 .proc_name = DRV_NAME,
247 .dma_boundary = ATA_DMA_BOUNDARY,
248 .slave_configure = ata_scsi_slave_config,
249 .slave_destroy = ata_scsi_slave_destroy,
250 .bios_param = ata_std_bios_param,
253 static const struct ata_port_operations efar_ops = {
254 .set_piomode = efar_set_piomode,
255 .set_dmamode = efar_set_dmamode,
256 .mode_filter = ata_pci_default_filter,
258 .tf_load = ata_tf_load,
259 .tf_read = ata_tf_read,
260 .check_status = ata_check_status,
261 .exec_command = ata_exec_command,
262 .dev_select = ata_std_dev_select,
264 .freeze = ata_bmdma_freeze,
265 .thaw = ata_bmdma_thaw,
266 .error_handler = efar_error_handler,
267 .post_internal_cmd = ata_bmdma_post_internal_cmd,
268 .cable_detect = efar_cable_detect,
270 .bmdma_setup = ata_bmdma_setup,
271 .bmdma_start = ata_bmdma_start,
272 .bmdma_stop = ata_bmdma_stop,
273 .bmdma_status = ata_bmdma_status,
274 .qc_prep = ata_qc_prep,
275 .qc_issue = ata_qc_issue_prot,
276 .data_xfer = ata_data_xfer,
278 .irq_handler = ata_interrupt,
279 .irq_clear = ata_bmdma_irq_clear,
280 .irq_on = ata_irq_on,
282 .port_start = ata_sff_port_start,
287 * efar_init_one - Register EFAR ATA PCI device with kernel services
288 * @pdev: PCI device to register
289 * @ent: Entry in efar_pci_tbl matching with @pdev
291 * Called from kernel PCI layer.
294 * Inherited from PCI layer (may sleep).
297 * Zero on success, or -ERRNO value.
300 static int efar_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
302 static int printed_version;
303 static const struct ata_port_info info = {
305 .flags = ATA_FLAG_SLAVE_POSS,
306 .pio_mask = 0x1f, /* pio0-4 */
307 .mwdma_mask = 0x07, /* mwdma1-2 */
308 .udma_mask = 0x0f, /* UDMA 66 */
309 .port_ops = &efar_ops,
311 const struct ata_port_info *ppi[] = { &info, NULL };
313 if (!printed_version++)
314 dev_printk(KERN_DEBUG, &pdev->dev,
315 "version " DRV_VERSION "\n");
317 return ata_pci_init_one(pdev, ppi);
320 static const struct pci_device_id efar_pci_tbl[] = {
321 { PCI_VDEVICE(EFAR, 0x9130), },
323 { } /* terminate list */
326 static struct pci_driver efar_pci_driver = {
328 .id_table = efar_pci_tbl,
329 .probe = efar_init_one,
330 .remove = ata_pci_remove_one,
332 .suspend = ata_pci_device_suspend,
333 .resume = ata_pci_device_resume,
337 static int __init efar_init(void)
339 return pci_register_driver(&efar_pci_driver);
342 static void __exit efar_exit(void)
344 pci_unregister_driver(&efar_pci_driver);
347 module_init(efar_init);
348 module_exit(efar_exit);
350 MODULE_AUTHOR("Alan Cox");
351 MODULE_DESCRIPTION("SCSI low-level driver for EFAR PIIX clones");
352 MODULE_LICENSE("GPL");
353 MODULE_DEVICE_TABLE(pci, efar_pci_tbl);
354 MODULE_VERSION(DRV_VERSION);