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 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/pci.h>
15 #include <linux/init.h>
16 #include <linux/blkdev.h>
17 #include <linux/delay.h>
18 #include <scsi/scsi_host.h>
19 #include <linux/libata.h>
21 #define DRV_NAME "pata_sl82c105"
22 #define DRV_VERSION "0.2.3"
26 * SL82C105 PCI config register 0x40 bits.
28 CTRL_IDE_IRQB = (1 << 30),
29 CTRL_IDE_IRQA = (1 << 28),
30 CTRL_LEGIRQ = (1 << 11),
31 CTRL_P1F16 = (1 << 5),
33 CTRL_P0F16 = (1 << 1),
38 * sl82c105_pre_reset - probe begin
41 * Set up cable type and use generic probe init
44 static int sl82c105_pre_reset(struct ata_port *ap)
46 static const struct pci_bits sl82c105_enable_bits[] = {
47 { 0x40, 1, 0x01, 0x01 },
48 { 0x40, 1, 0x10, 0x10 }
50 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
52 if (ap->port_no && !pci_test_config_bits(pdev, &sl82c105_enable_bits[ap->port_no]))
54 ap->cbl = ATA_CBL_PATA40;
55 return ata_std_prereset(ap);
59 static void sl82c105_error_handler(struct ata_port *ap)
61 ata_bmdma_drive_eh(ap, sl82c105_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
66 * sl82c105_configure_piomode - set chip PIO timing
71 * Called to do the PIO mode setup. Our timing registers are shared
72 * so a configure_dmamode call will undo any work we do here and vice
76 static void sl82c105_configure_piomode(struct ata_port *ap, struct ata_device *adev, int pio)
78 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
79 static u16 pio_timing[5] = {
80 0x50D, 0x407, 0x304, 0x242, 0x240
83 int timing = 0x44 + (8 * ap->port_no) + (4 * adev->devno);
85 pci_write_config_word(pdev, timing, pio_timing[pio]);
86 /* Can we lose this oddity of the old driver */
87 pci_read_config_word(pdev, timing, &dummy);
91 * sl82c105_set_piomode - set initial PIO mode data
95 * Called to do the PIO mode setup. Our timing registers are shared
96 * but we want to set the PIO timing by default.
99 static void sl82c105_set_piomode(struct ata_port *ap, struct ata_device *adev)
101 sl82c105_configure_piomode(ap, adev, adev->pio_mode - XFER_PIO_0);
105 * sl82c105_configure_dmamode - set DMA mode in chip
109 * Load DMA cycle times into the chip ready for a DMA transfer
113 static void sl82c105_configure_dmamode(struct ata_port *ap, struct ata_device *adev)
115 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
116 static u16 dma_timing[3] = {
120 int timing = 0x44 + (8 * ap->port_no) + (4 * adev->devno);
121 int dma = adev->dma_mode - XFER_MW_DMA_0;
123 pci_write_config_word(pdev, timing, dma_timing[dma]);
124 /* Can we lose this oddity of the old driver */
125 pci_read_config_word(pdev, timing, &dummy);
129 * sl82c105_set_dmamode - set initial DMA mode data
133 * Called to do the DMA mode setup. This replaces the PIO timings
134 * for the device in question. Set appropriate PIO timings not DMA
135 * timings at this point.
138 static void sl82c105_set_dmamode(struct ata_port *ap, struct ata_device *adev)
140 switch(adev->dma_mode) {
142 sl82c105_configure_piomode(ap, adev, 1);
145 sl82c105_configure_piomode(ap, adev, 3);
148 sl82c105_configure_piomode(ap, adev, 3);
156 * sl82c105_reset_engine - Reset the DMA engine
159 * The sl82c105 has some serious problems with the DMA engine
160 * when transfers don't run as expected or ATAPI is used. The
161 * recommended fix is to reset the engine each use using a chip
165 static void sl82c105_reset_engine(struct ata_port *ap)
167 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
170 pci_read_config_word(pdev, 0x7E, &val);
171 pci_write_config_word(pdev, 0x7E, val | 4);
172 pci_write_config_word(pdev, 0x7E, val & ~4);
176 * sl82c105_bmdma_start - DMA engine begin
179 * Reset the DMA engine each use as recommended by the errata
182 * FIXME: if we switch clock at BMDMA start/end we might get better
183 * PIO performance on DMA capable devices.
186 static void sl82c105_bmdma_start(struct ata_queued_cmd *qc)
188 struct ata_port *ap = qc->ap;
190 sl82c105_reset_engine(ap);
192 /* Set the clocks for DMA */
193 sl82c105_configure_dmamode(ap, qc->dev);
199 * sl82c105_bmdma_end - DMA engine stop
202 * Reset the DMA engine each use as recommended by the errata
205 * This function is also called to turn off DMA when a timeout occurs
206 * during DMA operation. In both cases we need to reset the engine,
207 * so no actual eng_timeout handler is required.
209 * We assume bmdma_stop is always called if bmdma_start as called. If
210 * not then we may need to wrap qc_issue.
213 static void sl82c105_bmdma_stop(struct ata_queued_cmd *qc)
215 struct ata_port *ap = qc->ap;
218 sl82c105_reset_engine(ap);
220 /* This will redo the initial setup of the DMA device to matching
222 sl82c105_set_dmamode(ap, qc->dev);
225 static struct scsi_host_template sl82c105_sht = {
226 .module = THIS_MODULE,
228 .ioctl = ata_scsi_ioctl,
229 .queuecommand = ata_scsi_queuecmd,
230 .can_queue = ATA_DEF_QUEUE,
231 .this_id = ATA_SHT_THIS_ID,
232 .sg_tablesize = LIBATA_MAX_PRD,
233 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
234 .emulated = ATA_SHT_EMULATED,
235 .use_clustering = ATA_SHT_USE_CLUSTERING,
236 .proc_name = DRV_NAME,
237 .dma_boundary = ATA_DMA_BOUNDARY,
238 .slave_configure = ata_scsi_slave_config,
239 .slave_destroy = ata_scsi_slave_destroy,
240 .bios_param = ata_std_bios_param,
243 static struct ata_port_operations sl82c105_port_ops = {
244 .port_disable = ata_port_disable,
245 .set_piomode = sl82c105_set_piomode,
246 .set_dmamode = sl82c105_set_dmamode,
247 .mode_filter = ata_pci_default_filter,
249 .tf_load = ata_tf_load,
250 .tf_read = ata_tf_read,
251 .check_status = ata_check_status,
252 .exec_command = ata_exec_command,
253 .dev_select = ata_std_dev_select,
255 .error_handler = sl82c105_error_handler,
257 .bmdma_setup = ata_bmdma_setup,
258 .bmdma_start = sl82c105_bmdma_start,
259 .bmdma_stop = sl82c105_bmdma_stop,
260 .bmdma_status = ata_bmdma_status,
262 .qc_prep = ata_qc_prep,
263 .qc_issue = ata_qc_issue_prot,
265 .data_xfer = ata_pio_data_xfer,
267 .irq_handler = ata_interrupt,
268 .irq_clear = ata_bmdma_irq_clear,
270 .port_start = ata_port_start,
271 .port_stop = ata_port_stop,
272 .host_stop = ata_host_stop
276 * sl82c105_bridge_revision - find bridge version
277 * @pdev: PCI device for the ATA function
279 * Locates the PCI bridge associated with the ATA function and
280 * providing it is a Winbond 553 reports the revision. If it cannot
281 * find a revision or the right device it returns -1
284 static int sl82c105_bridge_revision(struct pci_dev *pdev)
286 struct pci_dev *bridge;
290 * The bridge should be part of the same device, but function 0.
292 bridge = pci_get_slot(pdev->bus,
293 PCI_DEVFN(PCI_SLOT(pdev->devfn), 0));
298 * Make sure it is a Winbond 553 and is an ISA bridge.
300 if (bridge->vendor != PCI_VENDOR_ID_WINBOND ||
301 bridge->device != PCI_DEVICE_ID_WINBOND_83C553 ||
302 bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) {
307 * We need to find function 0's revision, not function 1
309 pci_read_config_byte(bridge, PCI_REVISION_ID, &rev);
316 static int sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
318 static struct ata_port_info info_dma = {
319 .sht = &sl82c105_sht,
320 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
323 .port_ops = &sl82c105_port_ops
325 static struct ata_port_info info_early = {
326 .sht = &sl82c105_sht,
327 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
329 .port_ops = &sl82c105_port_ops
331 static struct ata_port_info *port_info[2] = { &info_early, &info_early };
335 rev = sl82c105_bridge_revision(dev);
338 dev_printk(KERN_WARNING, &dev->dev, "pata_sl82c105: Unable to find bridge, disabling DMA.\n");
340 dev_printk(KERN_WARNING, &dev->dev, "pata_sl82c105: Early bridge revision, no DMA available.\n");
342 port_info[0] = &info_dma;
343 port_info[1] = &info_dma;
346 pci_read_config_dword(dev, 0x40, &val);
347 val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
348 pci_write_config_dword(dev, 0x40, val);
351 return ata_pci_init_one(dev, port_info, 1); /* For now */
354 static const struct pci_device_id sl82c105[] = {
355 { PCI_VDEVICE(WINBOND, PCI_DEVICE_ID_WINBOND_82C105), },
360 static struct pci_driver sl82c105_pci_driver = {
362 .id_table = sl82c105,
363 .probe = sl82c105_init_one,
364 .remove = ata_pci_remove_one
367 static int __init sl82c105_init(void)
369 return pci_register_driver(&sl82c105_pci_driver);
372 static void __exit sl82c105_exit(void)
374 pci_unregister_driver(&sl82c105_pci_driver);
377 MODULE_AUTHOR("Alan Cox");
378 MODULE_DESCRIPTION("low-level driver for Sl82c105");
379 MODULE_LICENSE("GPL");
380 MODULE_DEVICE_TABLE(pci, sl82c105);
381 MODULE_VERSION(DRV_VERSION);
383 module_init(sl82c105_init);
384 module_exit(sl82c105_exit);