2 * pata_efar.c - EFAR PIIX clone controller driver
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 "0.4.5"
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_sff_prereset(link, deadline);
52 * efar_cable_detect - check for 40/80 pin
55 * Perform cable detection for the EFAR ATA interface. This is
56 * different to the PIIX arrangement
59 static int efar_cable_detect(struct ata_port *ap)
61 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
64 pci_read_config_byte(pdev, 0x47, &tmp);
65 if (tmp & (2 >> ap->port_no))
66 return ATA_CBL_PATA40;
67 return ATA_CBL_PATA80;
71 * efar_set_piomode - Initialize host controller PATA PIO timings
72 * @ap: Port whose timings we are configuring
75 * Set PIO mode for device, in host controller PCI config space.
78 * None (inherited from caller).
81 static void efar_set_piomode (struct ata_port *ap, struct ata_device *adev)
83 unsigned int pio = adev->pio_mode - XFER_PIO_0;
84 struct pci_dev *dev = to_pci_dev(ap->host->dev);
85 unsigned int idetm_port= ap->port_no ? 0x42 : 0x40;
90 * See Intel Document 298600-004 for the timing programing rules
91 * for PIIX/ICH. The EFAR is a clone so very similar
94 static const /* ISP RTC */
95 u8 timings[][2] = { { 0, 0 },
102 control |= 1; /* TIME */
103 if (ata_pio_need_iordy(adev)) /* PIO 3/4 require IORDY */
104 control |= 2; /* IE */
105 /* Intel specifies that the prefetch/posting is for disk only */
106 if (adev->class == ATA_DEV_ATA)
107 control |= 4; /* PPE */
109 pci_read_config_word(dev, idetm_port, &idetm_data);
111 /* Set PPE, IE, and TIME as appropriate */
112 if (adev->devno == 0) {
113 idetm_data &= 0xCCF0;
114 idetm_data |= control;
115 idetm_data |= (timings[pio][0] << 12) |
116 (timings[pio][1] << 8);
118 int shift = 4 * ap->port_no;
121 idetm_data &= 0xCC0F;
122 idetm_data |= (control << 4);
124 /* Slave timing in separate register */
125 pci_read_config_byte(dev, 0x44, &slave_data);
126 slave_data &= 0x0F << shift;
127 slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << shift;
128 pci_write_config_byte(dev, 0x44, slave_data);
131 idetm_data |= 0x4000; /* Ensure SITRE is set */
132 pci_write_config_word(dev, idetm_port, idetm_data);
136 * efar_set_dmamode - Initialize host controller PATA DMA timings
137 * @ap: Port whose timings we are configuring
138 * @adev: Device to program
140 * Set UDMA/MWDMA mode for device, in host controller PCI config space.
143 * None (inherited from caller).
146 static void efar_set_dmamode (struct ata_port *ap, struct ata_device *adev)
148 struct pci_dev *dev = to_pci_dev(ap->host->dev);
149 u8 master_port = ap->port_no ? 0x42 : 0x40;
151 u8 speed = adev->dma_mode;
152 int devid = adev->devno + 2 * ap->port_no;
155 static const /* ISP RTC */
156 u8 timings[][2] = { { 0, 0 },
162 pci_read_config_word(dev, master_port, &master_data);
163 pci_read_config_byte(dev, 0x48, &udma_enable);
165 if (speed >= XFER_UDMA_0) {
166 unsigned int udma = adev->dma_mode - XFER_UDMA_0;
169 udma_enable |= (1 << devid);
171 /* Load the UDMA mode number */
172 pci_read_config_word(dev, 0x4A, &udma_timing);
173 udma_timing &= ~(7 << (4 * devid));
174 udma_timing |= udma << (4 * devid);
175 pci_write_config_word(dev, 0x4A, udma_timing);
178 * MWDMA is driven by the PIO timings. We must also enable
179 * IORDY unconditionally along with TIME1. PPE has already
180 * been set when the PIO timing was set.
182 unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0;
183 unsigned int control;
185 const unsigned int needed_pio[3] = {
186 XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
188 int pio = needed_pio[mwdma] - XFER_PIO_0;
190 control = 3; /* IORDY|TIME1 */
192 /* If the drive MWDMA is faster than it can do PIO then
193 we must force PIO into PIO0 */
195 if (adev->pio_mode < needed_pio[mwdma])
196 /* Enable DMA timing only */
197 control |= 8; /* PIO cycles in PIO0 */
199 if (adev->devno) { /* Slave */
200 master_data &= 0xFF4F; /* Mask out IORDY|TIME1|DMAONLY */
201 master_data |= control << 4;
202 pci_read_config_byte(dev, 0x44, &slave_data);
203 slave_data &= (0x0F + 0xE1 * ap->port_no);
204 /* Load the matching timing */
205 slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);
206 pci_write_config_byte(dev, 0x44, slave_data);
207 } else { /* Master */
208 master_data &= 0xCCF4; /* Mask out IORDY|TIME1|DMAONLY
209 and master timing bits */
210 master_data |= control;
212 (timings[pio][0] << 12) |
213 (timings[pio][1] << 8);
215 udma_enable &= ~(1 << devid);
216 pci_write_config_word(dev, master_port, master_data);
218 pci_write_config_byte(dev, 0x48, udma_enable);
221 static struct scsi_host_template efar_sht = {
222 ATA_BMDMA_SHT(DRV_NAME),
225 static struct ata_port_operations efar_ops = {
226 .inherits = &ata_bmdma_port_ops,
227 .cable_detect = efar_cable_detect,
228 .set_piomode = efar_set_piomode,
229 .set_dmamode = efar_set_dmamode,
230 .prereset = efar_pre_reset,
235 * efar_init_one - Register EFAR ATA PCI device with kernel services
236 * @pdev: PCI device to register
237 * @ent: Entry in efar_pci_tbl matching with @pdev
239 * Called from kernel PCI layer.
242 * Inherited from PCI layer (may sleep).
245 * Zero on success, or -ERRNO value.
248 static int efar_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
250 static int printed_version;
251 static const struct ata_port_info info = {
252 .flags = ATA_FLAG_SLAVE_POSS,
253 .pio_mask = ATA_PIO4,
254 .mwdma_mask = ATA_MWDMA2,
255 .udma_mask = ATA_UDMA4,
256 .port_ops = &efar_ops,
258 const struct ata_port_info *ppi[] = { &info, NULL };
260 if (!printed_version++)
261 dev_printk(KERN_DEBUG, &pdev->dev,
262 "version " DRV_VERSION "\n");
264 return ata_pci_sff_init_one(pdev, ppi, &efar_sht, NULL);
267 static const struct pci_device_id efar_pci_tbl[] = {
268 { PCI_VDEVICE(EFAR, 0x9130), },
270 { } /* terminate list */
273 static struct pci_driver efar_pci_driver = {
275 .id_table = efar_pci_tbl,
276 .probe = efar_init_one,
277 .remove = ata_pci_remove_one,
279 .suspend = ata_pci_device_suspend,
280 .resume = ata_pci_device_resume,
284 static int __init efar_init(void)
286 return pci_register_driver(&efar_pci_driver);
289 static void __exit efar_exit(void)
291 pci_unregister_driver(&efar_pci_driver);
294 module_init(efar_init);
295 module_exit(efar_exit);
297 MODULE_AUTHOR("Alan Cox");
298 MODULE_DESCRIPTION("SCSI low-level driver for EFAR PIIX clones");
299 MODULE_LICENSE("GPL");
300 MODULE_DEVICE_TABLE(pci, efar_pci_tbl);
301 MODULE_VERSION(DRV_VERSION);