2 * pata_sl82c105.c - SL82C105 PATA for new ATA layer
4 * Alan Cox <alan@redhat.com>
6 * Based in part on linux/drivers/ide/pci/sl82c105.c
7 * SL82C105/Winbond 553 IDE driver
9 * and in part on the documentation and errata sheet
12 * Note: The controller like many controllers has shared timings for
13 * PIO and DMA. We thus flip to the DMA timings in dma_start and flip back
14 * in the dma_stop function. Thus we actually don't need a set_dmamode
15 * method as the PIO method is always called and will set the right PIO
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/pci.h>
22 #include <linux/init.h>
23 #include <linux/blkdev.h>
24 #include <linux/delay.h>
25 #include <scsi/scsi_host.h>
26 #include <linux/libata.h>
28 #define DRV_NAME "pata_sl82c105"
29 #define DRV_VERSION "0.3.3"
33 * SL82C105 PCI config register 0x40 bits.
35 CTRL_IDE_IRQB = (1 << 30),
36 CTRL_IDE_IRQA = (1 << 28),
37 CTRL_LEGIRQ = (1 << 11),
38 CTRL_P1F16 = (1 << 5),
40 CTRL_P0F16 = (1 << 1),
45 * sl82c105_pre_reset - probe begin
47 * @deadline: deadline jiffies for the operation
49 * Set up cable type and use generic probe init
52 static int sl82c105_pre_reset(struct ata_link *link, unsigned long deadline)
54 static const struct pci_bits sl82c105_enable_bits[] = {
55 { 0x40, 1, 0x01, 0x01 },
56 { 0x40, 1, 0x10, 0x10 }
58 struct ata_port *ap = link->ap;
59 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
61 if (ap->port_no && !pci_test_config_bits(pdev, &sl82c105_enable_bits[ap->port_no]))
63 return ata_std_prereset(link, deadline);
67 static void sl82c105_error_handler(struct ata_port *ap)
69 ata_bmdma_drive_eh(ap, sl82c105_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
74 * sl82c105_configure_piomode - set chip PIO timing
79 * Called to do the PIO mode setup. Our timing registers are shared
80 * so a configure_dmamode call will undo any work we do here and vice
84 static void sl82c105_configure_piomode(struct ata_port *ap, struct ata_device *adev, int pio)
86 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
87 static u16 pio_timing[5] = {
88 0x50D, 0x407, 0x304, 0x242, 0x240
91 int timing = 0x44 + (8 * ap->port_no) + (4 * adev->devno);
93 pci_write_config_word(pdev, timing, pio_timing[pio]);
94 /* Can we lose this oddity of the old driver */
95 pci_read_config_word(pdev, timing, &dummy);
99 * sl82c105_set_piomode - set initial PIO mode data
103 * Called to do the PIO mode setup. Our timing registers are shared
104 * but we want to set the PIO timing by default.
107 static void sl82c105_set_piomode(struct ata_port *ap, struct ata_device *adev)
109 sl82c105_configure_piomode(ap, adev, adev->pio_mode - XFER_PIO_0);
113 * sl82c105_configure_dmamode - set DMA mode in chip
117 * Load DMA cycle times into the chip ready for a DMA transfer
121 static void sl82c105_configure_dmamode(struct ata_port *ap, struct ata_device *adev)
123 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
124 static u16 dma_timing[3] = {
128 int timing = 0x44 + (8 * ap->port_no) + (4 * adev->devno);
129 int dma = adev->dma_mode - XFER_MW_DMA_0;
131 pci_write_config_word(pdev, timing, dma_timing[dma]);
132 /* Can we lose this oddity of the old driver */
133 pci_read_config_word(pdev, timing, &dummy);
137 * sl82c105_reset_engine - Reset the DMA engine
140 * The sl82c105 has some serious problems with the DMA engine
141 * when transfers don't run as expected or ATAPI is used. The
142 * recommended fix is to reset the engine each use using a chip
146 static void sl82c105_reset_engine(struct ata_port *ap)
148 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
151 pci_read_config_word(pdev, 0x7E, &val);
152 pci_write_config_word(pdev, 0x7E, val | 4);
153 pci_write_config_word(pdev, 0x7E, val & ~4);
157 * sl82c105_bmdma_start - DMA engine begin
160 * Reset the DMA engine each use as recommended by the errata
163 * FIXME: if we switch clock at BMDMA start/end we might get better
164 * PIO performance on DMA capable devices.
167 static void sl82c105_bmdma_start(struct ata_queued_cmd *qc)
169 struct ata_port *ap = qc->ap;
172 sl82c105_reset_engine(ap);
175 /* Set the clocks for DMA */
176 sl82c105_configure_dmamode(ap, qc->dev);
182 * sl82c105_bmdma_end - DMA engine stop
185 * Reset the DMA engine each use as recommended by the errata
188 * This function is also called to turn off DMA when a timeout occurs
189 * during DMA operation. In both cases we need to reset the engine,
190 * so no actual eng_timeout handler is required.
192 * We assume bmdma_stop is always called if bmdma_start as called. If
193 * not then we may need to wrap qc_issue.
196 static void sl82c105_bmdma_stop(struct ata_queued_cmd *qc)
198 struct ata_port *ap = qc->ap;
201 sl82c105_reset_engine(ap);
204 /* This will redo the initial setup of the DMA device to matching
206 sl82c105_set_piomode(ap, qc->dev);
210 * sl82c105_qc_defer - implement serialization
213 * We must issue one command per host not per channel because
216 * Q: is the scsi host lock sufficient ?
219 static int sl82c105_qc_defer(struct ata_queued_cmd *qc)
221 struct ata_host *host = qc->ap->host;
222 struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
225 /* First apply the usual rules */
226 rc = ata_std_qc_defer(qc);
230 /* Now apply serialization rules. Only allow a command if the
231 other channel state machine is idle */
232 if (alt && alt->qc_active)
233 return ATA_DEFER_PORT;
237 static struct scsi_host_template sl82c105_sht = {
238 ATA_BMDMA_SHT(DRV_NAME),
241 static struct ata_port_operations sl82c105_port_ops = {
242 .inherits = &ata_bmdma_port_ops,
243 .qc_defer = sl82c105_qc_defer,
244 .bmdma_start = sl82c105_bmdma_start,
245 .bmdma_stop = sl82c105_bmdma_stop,
246 .cable_detect = ata_cable_40wire,
247 .set_piomode = sl82c105_set_piomode,
248 .error_handler = sl82c105_error_handler,
252 * sl82c105_bridge_revision - find bridge version
253 * @pdev: PCI device for the ATA function
255 * Locates the PCI bridge associated with the ATA function and
256 * providing it is a Winbond 553 reports the revision. If it cannot
257 * find a revision or the right device it returns -1
260 static int sl82c105_bridge_revision(struct pci_dev *pdev)
262 struct pci_dev *bridge;
265 * The bridge should be part of the same device, but function 0.
267 bridge = pci_get_slot(pdev->bus,
268 PCI_DEVFN(PCI_SLOT(pdev->devfn), 0));
273 * Make sure it is a Winbond 553 and is an ISA bridge.
275 if (bridge->vendor != PCI_VENDOR_ID_WINBOND ||
276 bridge->device != PCI_DEVICE_ID_WINBOND_83C553 ||
277 bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) {
282 * We need to find function 0's revision, not function 1
285 return bridge->revision;
289 static int sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
291 static const struct ata_port_info info_dma = {
292 .flags = ATA_FLAG_SLAVE_POSS,
295 .port_ops = &sl82c105_port_ops
297 static const struct ata_port_info info_early = {
298 .flags = ATA_FLAG_SLAVE_POSS,
300 .port_ops = &sl82c105_port_ops
302 /* for now use only the first port */
303 const struct ata_port_info *ppi[] = { &info_early,
309 rc = pcim_enable_device(dev);
313 rev = sl82c105_bridge_revision(dev);
316 dev_printk(KERN_WARNING, &dev->dev, "pata_sl82c105: Unable to find bridge, disabling DMA.\n");
318 dev_printk(KERN_WARNING, &dev->dev, "pata_sl82c105: Early bridge revision, no DMA available.\n");
322 pci_read_config_dword(dev, 0x40, &val);
323 val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
324 pci_write_config_dword(dev, 0x40, val);
326 return ata_pci_init_one(dev, ppi, &sl82c105_sht, NULL);
329 static const struct pci_device_id sl82c105[] = {
330 { PCI_VDEVICE(WINBOND, PCI_DEVICE_ID_WINBOND_82C105), },
335 static struct pci_driver sl82c105_pci_driver = {
337 .id_table = sl82c105,
338 .probe = sl82c105_init_one,
339 .remove = ata_pci_remove_one
342 static int __init sl82c105_init(void)
344 return pci_register_driver(&sl82c105_pci_driver);
347 static void __exit sl82c105_exit(void)
349 pci_unregister_driver(&sl82c105_pci_driver);
352 MODULE_AUTHOR("Alan Cox");
353 MODULE_DESCRIPTION("low-level driver for Sl82c105");
354 MODULE_LICENSE("GPL");
355 MODULE_DEVICE_TABLE(pci, sl82c105);
356 MODULE_VERSION(DRV_VERSION);
358 module_init(sl82c105_init);
359 module_exit(sl82c105_exit);