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 "0.3.0"
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
48 * Set up cable type and use generic probe init
51 static int sl82c105_pre_reset(struct ata_port *ap)
53 static const struct pci_bits sl82c105_enable_bits[] = {
54 { 0x40, 1, 0x01, 0x01 },
55 { 0x40, 1, 0x10, 0x10 }
57 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
59 if (ap->port_no && !pci_test_config_bits(pdev, &sl82c105_enable_bits[ap->port_no]))
61 return ata_std_prereset(ap);
65 static void sl82c105_error_handler(struct ata_port *ap)
67 ata_bmdma_drive_eh(ap, sl82c105_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
72 * sl82c105_configure_piomode - set chip PIO timing
77 * Called to do the PIO mode setup. Our timing registers are shared
78 * so a configure_dmamode call will undo any work we do here and vice
82 static void sl82c105_configure_piomode(struct ata_port *ap, struct ata_device *adev, int pio)
84 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
85 static u16 pio_timing[5] = {
86 0x50D, 0x407, 0x304, 0x242, 0x240
89 int timing = 0x44 + (8 * ap->port_no) + (4 * adev->devno);
91 pci_write_config_word(pdev, timing, pio_timing[pio]);
92 /* Can we lose this oddity of the old driver */
93 pci_read_config_word(pdev, timing, &dummy);
97 * sl82c105_set_piomode - set initial PIO mode data
101 * Called to do the PIO mode setup. Our timing registers are shared
102 * but we want to set the PIO timing by default.
105 static void sl82c105_set_piomode(struct ata_port *ap, struct ata_device *adev)
107 sl82c105_configure_piomode(ap, adev, adev->pio_mode - XFER_PIO_0);
111 * sl82c105_configure_dmamode - set DMA mode in chip
115 * Load DMA cycle times into the chip ready for a DMA transfer
119 static void sl82c105_configure_dmamode(struct ata_port *ap, struct ata_device *adev)
121 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
122 static u16 dma_timing[3] = {
126 int timing = 0x44 + (8 * ap->port_no) + (4 * adev->devno);
127 int dma = adev->dma_mode - XFER_MW_DMA_0;
129 pci_write_config_word(pdev, timing, dma_timing[dma]);
130 /* Can we lose this oddity of the old driver */
131 pci_read_config_word(pdev, timing, &dummy);
135 * sl82c105_reset_engine - Reset the DMA engine
138 * The sl82c105 has some serious problems with the DMA engine
139 * when transfers don't run as expected or ATAPI is used. The
140 * recommended fix is to reset the engine each use using a chip
144 static void sl82c105_reset_engine(struct ata_port *ap)
146 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
149 pci_read_config_word(pdev, 0x7E, &val);
150 pci_write_config_word(pdev, 0x7E, val | 4);
151 pci_write_config_word(pdev, 0x7E, val & ~4);
155 * sl82c105_bmdma_start - DMA engine begin
158 * Reset the DMA engine each use as recommended by the errata
161 * FIXME: if we switch clock at BMDMA start/end we might get better
162 * PIO performance on DMA capable devices.
165 static void sl82c105_bmdma_start(struct ata_queued_cmd *qc)
167 struct ata_port *ap = qc->ap;
170 sl82c105_reset_engine(ap);
173 /* Set the clocks for DMA */
174 sl82c105_configure_dmamode(ap, qc->dev);
180 * sl82c105_bmdma_end - DMA engine stop
183 * Reset the DMA engine each use as recommended by the errata
186 * This function is also called to turn off DMA when a timeout occurs
187 * during DMA operation. In both cases we need to reset the engine,
188 * so no actual eng_timeout handler is required.
190 * We assume bmdma_stop is always called if bmdma_start as called. If
191 * not then we may need to wrap qc_issue.
194 static void sl82c105_bmdma_stop(struct ata_queued_cmd *qc)
196 struct ata_port *ap = qc->ap;
199 sl82c105_reset_engine(ap);
202 /* This will redo the initial setup of the DMA device to matching
204 sl82c105_set_piomode(ap, qc->dev);
207 static struct scsi_host_template sl82c105_sht = {
208 .module = THIS_MODULE,
210 .ioctl = ata_scsi_ioctl,
211 .queuecommand = ata_scsi_queuecmd,
212 .can_queue = ATA_DEF_QUEUE,
213 .this_id = ATA_SHT_THIS_ID,
214 .sg_tablesize = LIBATA_MAX_PRD,
215 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
216 .emulated = ATA_SHT_EMULATED,
217 .use_clustering = ATA_SHT_USE_CLUSTERING,
218 .proc_name = DRV_NAME,
219 .dma_boundary = ATA_DMA_BOUNDARY,
220 .slave_configure = ata_scsi_slave_config,
221 .slave_destroy = ata_scsi_slave_destroy,
222 .bios_param = ata_std_bios_param,
225 static struct ata_port_operations sl82c105_port_ops = {
226 .port_disable = ata_port_disable,
227 .set_piomode = sl82c105_set_piomode,
228 .mode_filter = ata_pci_default_filter,
230 .tf_load = ata_tf_load,
231 .tf_read = ata_tf_read,
232 .check_status = ata_check_status,
233 .exec_command = ata_exec_command,
234 .dev_select = ata_std_dev_select,
236 .freeze = ata_bmdma_freeze,
237 .thaw = ata_bmdma_thaw,
238 .error_handler = sl82c105_error_handler,
239 .post_internal_cmd = ata_bmdma_post_internal_cmd,
240 .cable_detect = ata_cable_40wire,
242 .bmdma_setup = ata_bmdma_setup,
243 .bmdma_start = sl82c105_bmdma_start,
244 .bmdma_stop = sl82c105_bmdma_stop,
245 .bmdma_status = ata_bmdma_status,
247 .qc_prep = ata_qc_prep,
248 .qc_issue = ata_qc_issue_prot,
250 .data_xfer = ata_data_xfer,
252 .irq_handler = ata_interrupt,
253 .irq_clear = ata_bmdma_irq_clear,
254 .irq_on = ata_irq_on,
255 .irq_ack = ata_irq_ack,
257 .port_start = ata_port_start,
261 * sl82c105_bridge_revision - find bridge version
262 * @pdev: PCI device for the ATA function
264 * Locates the PCI bridge associated with the ATA function and
265 * providing it is a Winbond 553 reports the revision. If it cannot
266 * find a revision or the right device it returns -1
269 static int sl82c105_bridge_revision(struct pci_dev *pdev)
271 struct pci_dev *bridge;
275 * The bridge should be part of the same device, but function 0.
277 bridge = pci_get_slot(pdev->bus,
278 PCI_DEVFN(PCI_SLOT(pdev->devfn), 0));
283 * Make sure it is a Winbond 553 and is an ISA bridge.
285 if (bridge->vendor != PCI_VENDOR_ID_WINBOND ||
286 bridge->device != PCI_DEVICE_ID_WINBOND_83C553 ||
287 bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) {
292 * We need to find function 0's revision, not function 1
294 pci_read_config_byte(bridge, PCI_REVISION_ID, &rev);
301 static int sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
303 static struct ata_port_info info_dma = {
304 .sht = &sl82c105_sht,
305 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
308 .port_ops = &sl82c105_port_ops
310 static struct ata_port_info info_early = {
311 .sht = &sl82c105_sht,
312 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
314 .port_ops = &sl82c105_port_ops
316 static struct ata_port_info *port_info[2] = { &info_early, &info_early };
320 rev = sl82c105_bridge_revision(dev);
323 dev_printk(KERN_WARNING, &dev->dev, "pata_sl82c105: Unable to find bridge, disabling DMA.\n");
325 dev_printk(KERN_WARNING, &dev->dev, "pata_sl82c105: Early bridge revision, no DMA available.\n");
327 port_info[0] = &info_dma;
328 port_info[1] = &info_dma;
331 pci_read_config_dword(dev, 0x40, &val);
332 val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
333 pci_write_config_dword(dev, 0x40, val);
336 return ata_pci_init_one(dev, port_info, 1); /* For now */
339 static const struct pci_device_id sl82c105[] = {
340 { PCI_VDEVICE(WINBOND, PCI_DEVICE_ID_WINBOND_82C105), },
345 static struct pci_driver sl82c105_pci_driver = {
347 .id_table = sl82c105,
348 .probe = sl82c105_init_one,
349 .remove = ata_pci_remove_one
352 static int __init sl82c105_init(void)
354 return pci_register_driver(&sl82c105_pci_driver);
357 static void __exit sl82c105_exit(void)
359 pci_unregister_driver(&sl82c105_pci_driver);
362 MODULE_AUTHOR("Alan Cox");
363 MODULE_DESCRIPTION("low-level driver for Sl82c105");
364 MODULE_LICENSE("GPL");
365 MODULE_DEVICE_TABLE(pci, sl82c105);
366 MODULE_VERSION(DRV_VERSION);
368 module_init(sl82c105_init);
369 module_exit(sl82c105_exit);