2 * pata_radisys.c - Intel PATA/SATA controllers
4 * (C) 2006 Red Hat <alan@redhat.com>
6 * Some parts based on ata_piix.c by Jeff Garzik and others.
8 * A PIIX relative, this device has a single ATA channel and no
9 * slave timings, SITRE or PPE. In that sense it is a close relative
10 * of the original PIIX. It does however support UDMA 33/66 per channel
11 * although no other modes/timings. Also lacking is 32bit I/O on the ATA
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/pci.h>
18 #include <linux/init.h>
19 #include <linux/blkdev.h>
20 #include <linux/delay.h>
21 #include <linux/device.h>
22 #include <scsi/scsi_host.h>
23 #include <linux/libata.h>
24 #include <linux/ata.h>
26 #define DRV_NAME "pata_radisys"
27 #define DRV_VERSION "0.4.4"
30 * radisys_set_piomode - Initialize host controller PATA PIO timings
32 * @adev: Device whose timings we are configuring
34 * Set PIO mode for device, in host controller PCI config space.
37 * None (inherited from caller).
40 static void radisys_set_piomode (struct ata_port *ap, struct ata_device *adev)
42 unsigned int pio = adev->pio_mode - XFER_PIO_0;
43 struct pci_dev *dev = to_pci_dev(ap->host->dev);
48 * See Intel Document 298600-004 for the timing programing rules
49 * for PIIX/ICH. Note that the early PIIX does not have the slave
50 * timing port at 0x44. The Radisys is a relative of the PIIX
51 * but not the same so be careful.
54 static const /* ISP RTC */
55 u8 timings[][2] = { { 0, 0 }, /* Check me */
62 control |= 1; /* TIME1 enable */
63 if (ata_pio_need_iordy(adev))
64 control |= 2; /* IE IORDY */
66 pci_read_config_word(dev, 0x40, &idetm_data);
68 /* Enable IE and TIME as appropriate. Clear the other
71 idetm_data |= (control << (4 * adev->devno));
72 idetm_data |= (timings[pio][0] << 12) |
73 (timings[pio][1] << 8);
74 pci_write_config_word(dev, 0x40, idetm_data);
76 /* Track which port is configured */
77 ap->private_data = adev;
81 * radisys_set_dmamode - Initialize host controller PATA DMA timings
82 * @ap: Port whose timings we are configuring
83 * @adev: Device to program
84 * @isich: True if the device is an ICH and has IOCFG registers
86 * Set MWDMA mode for device, in host controller PCI config space.
89 * None (inherited from caller).
92 static void radisys_set_dmamode (struct ata_port *ap, struct ata_device *adev)
94 struct pci_dev *dev = to_pci_dev(ap->host->dev);
98 static const /* ISP RTC */
99 u8 timings[][2] = { { 0, 0 },
106 * MWDMA is driven by the PIO timings. We must also enable
107 * IORDY unconditionally.
110 pci_read_config_word(dev, 0x40, &idetm_data);
111 pci_read_config_byte(dev, 0x48, &udma_enable);
113 if (adev->dma_mode < XFER_UDMA_0) {
114 unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0;
115 const unsigned int needed_pio[3] = {
116 XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
118 int pio = needed_pio[mwdma] - XFER_PIO_0;
119 int control = 3; /* IORDY|TIME0 */
121 /* If the drive MWDMA is faster than it can do PIO then
122 we must force PIO0 for PIO cycles. */
124 if (adev->pio_mode < needed_pio[mwdma])
127 /* Mask out the relevant control and timing bits we will load. Also
128 clear the other drive TIME register as a precaution */
130 idetm_data &= 0xCCCC;
131 idetm_data |= control << (4 * adev->devno);
132 idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
134 udma_enable &= ~(1 << adev->devno);
138 /* UDMA66 on: UDMA 33 and 66 are switchable via register 0x4A */
140 pci_read_config_byte(dev, 0x4A, &udma_mode);
142 if (adev->xfer_mode == XFER_UDMA_2)
143 udma_mode &= ~ (1 << adev->devno);
145 udma_mode |= (1 << adev->devno);
147 pci_write_config_byte(dev, 0x4A, udma_mode);
149 udma_enable |= (1 << adev->devno);
151 pci_write_config_word(dev, 0x40, idetm_data);
152 pci_write_config_byte(dev, 0x48, udma_enable);
154 /* Track which port is configured */
155 ap->private_data = adev;
159 * radisys_qc_issue_prot - command issue
160 * @qc: command pending
162 * Called when the libata layer is about to issue a command. We wrap
163 * this interface so that we can load the correct ATA timings if
164 * neccessary. Our logic also clears TIME0/TIME1 for the other device so
165 * that, even if we get this wrong, cycles to the other device will
169 static unsigned int radisys_qc_issue_prot(struct ata_queued_cmd *qc)
171 struct ata_port *ap = qc->ap;
172 struct ata_device *adev = qc->dev;
174 if (adev != ap->private_data) {
175 /* UDMA timing is not shared */
176 if (adev->dma_mode < XFER_UDMA_0) {
178 radisys_set_dmamode(ap, adev);
179 else if (adev->pio_mode)
180 radisys_set_piomode(ap, adev);
183 return ata_qc_issue_prot(qc);
187 static struct scsi_host_template radisys_sht = {
188 .module = THIS_MODULE,
190 .ioctl = ata_scsi_ioctl,
191 .queuecommand = ata_scsi_queuecmd,
192 .can_queue = ATA_DEF_QUEUE,
193 .this_id = ATA_SHT_THIS_ID,
194 .sg_tablesize = LIBATA_MAX_PRD,
195 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
196 .emulated = ATA_SHT_EMULATED,
197 .use_clustering = ATA_SHT_USE_CLUSTERING,
198 .proc_name = DRV_NAME,
199 .dma_boundary = ATA_DMA_BOUNDARY,
200 .slave_configure = ata_scsi_slave_config,
201 .slave_destroy = ata_scsi_slave_destroy,
202 .bios_param = ata_std_bios_param,
204 .resume = ata_scsi_device_resume,
205 .suspend = ata_scsi_device_suspend,
209 static const struct ata_port_operations radisys_pata_ops = {
210 .port_disable = ata_port_disable,
211 .set_piomode = radisys_set_piomode,
212 .set_dmamode = radisys_set_dmamode,
213 .mode_filter = ata_pci_default_filter,
215 .tf_load = ata_tf_load,
216 .tf_read = ata_tf_read,
217 .check_status = ata_check_status,
218 .exec_command = ata_exec_command,
219 .dev_select = ata_std_dev_select,
221 .freeze = ata_bmdma_freeze,
222 .thaw = ata_bmdma_thaw,
223 .error_handler = ata_bmdma_error_handler,
224 .post_internal_cmd = ata_bmdma_post_internal_cmd,
225 .cable_detect = ata_cable_unknown,
227 .bmdma_setup = ata_bmdma_setup,
228 .bmdma_start = ata_bmdma_start,
229 .bmdma_stop = ata_bmdma_stop,
230 .bmdma_status = ata_bmdma_status,
231 .qc_prep = ata_qc_prep,
232 .qc_issue = radisys_qc_issue_prot,
233 .data_xfer = ata_data_xfer,
235 .irq_handler = ata_interrupt,
236 .irq_clear = ata_bmdma_irq_clear,
237 .irq_on = ata_irq_on,
238 .irq_ack = ata_irq_ack,
240 .port_start = ata_port_start,
245 * radisys_init_one - Register PIIX ATA PCI device with kernel services
246 * @pdev: PCI device to register
247 * @ent: Entry in radisys_pci_tbl matching with @pdev
249 * Called from kernel PCI layer. We probe for combined mode (sigh),
250 * and then hand over control to libata, for it to do the rest.
253 * Inherited from PCI layer (may sleep).
256 * Zero on success, or -ERRNO value.
259 static int radisys_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
261 static int printed_version;
262 static struct ata_port_info info = {
264 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
265 .pio_mask = 0x1f, /* pio0-4 */
266 .mwdma_mask = 0x07, /* mwdma1-2 */
267 .udma_mask = 0x14, /* UDMA33/66 only */
268 .port_ops = &radisys_pata_ops,
270 static struct ata_port_info *port_info[2] = { &info, &info };
272 if (!printed_version++)
273 dev_printk(KERN_DEBUG, &pdev->dev,
274 "version " DRV_VERSION "\n");
276 return ata_pci_init_one(pdev, port_info, 2);
279 static const struct pci_device_id radisys_pci_tbl[] = {
280 { PCI_VDEVICE(RADISYS, 0x8201), },
282 { } /* terminate list */
285 static struct pci_driver radisys_pci_driver = {
287 .id_table = radisys_pci_tbl,
288 .probe = radisys_init_one,
289 .remove = ata_pci_remove_one,
291 .suspend = ata_pci_device_suspend,
292 .resume = ata_pci_device_resume,
296 static int __init radisys_init(void)
298 return pci_register_driver(&radisys_pci_driver);
301 static void __exit radisys_exit(void)
303 pci_unregister_driver(&radisys_pci_driver);
306 module_init(radisys_init);
307 module_exit(radisys_exit);
309 MODULE_AUTHOR("Alan Cox");
310 MODULE_DESCRIPTION("SCSI low-level driver for Radisys R82600 controllers");
311 MODULE_LICENSE("GPL");
312 MODULE_DEVICE_TABLE(pci, radisys_pci_tbl);
313 MODULE_VERSION(DRV_VERSION);