2 * SL82C105/Winbond 553 IDE driver
6 * Drive tuning added from Rebel.com's kernel sources
7 * -- Russell King (15/11/98) linux@arm.linux.org.uk
9 * Merge in Russell's HW workarounds, fix various problems
10 * with the timing registers setup.
11 * -- Benjamin Herrenschmidt (01/11/03) benh@kernel.crashing.org
13 * Copyright (C) 2006-2007,2009 MontaVista Software, Inc. <source@mvista.com>
14 * Copyright (C) 2007 Bartlomiej Zolnierkiewicz
17 #include <linux/types.h>
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/pci.h>
21 #include <linux/ide.h>
25 #define DRV_NAME "sl82c105"
30 #define DBG(arg) printk arg
35 * SL82C105 PCI config register 0x40 bits.
37 #define CTRL_IDE_IRQB (1 << 30)
38 #define CTRL_IDE_IRQA (1 << 28)
39 #define CTRL_LEGIRQ (1 << 11)
40 #define CTRL_P1F16 (1 << 5)
41 #define CTRL_P1EN (1 << 4)
42 #define CTRL_P0F16 (1 << 1)
43 #define CTRL_P0EN (1 << 0)
46 * Convert a PIO mode and cycle time to the required on/off times
47 * for the interface. This has protection against runaway timings.
49 static unsigned int get_pio_timings(ide_drive_t *drive, u8 pio)
51 struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
52 unsigned int cmd_on, cmd_off;
55 cmd_on = (t->active + 29) / 30;
56 cmd_off = (ide_pio_cycle_time(drive, pio) - 30 * cmd_on + 29) / 30;
64 if ((pio > 2 || ata_id_has_iordy(drive->id)) &&
65 !(pio > 4 && ata_id_is_cfa(drive->id)))
68 return (cmd_on - 1) << 8 | (cmd_off - 1) | iordy;
72 * Configure the chipset for PIO mode.
74 static void sl82c105_set_pio_mode(ide_drive_t *drive, const u8 pio)
76 struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
77 int reg = 0x44 + drive->dn * 4;
80 drv_ctrl = get_pio_timings(drive, pio);
83 * Store the PIO timings so that we can restore them
84 * in case DMA will be turned off...
86 drive->drive_data &= 0xffff0000;
87 drive->drive_data |= drv_ctrl;
89 pci_write_config_word(dev, reg, drv_ctrl);
90 pci_read_config_word (dev, reg, &drv_ctrl);
92 printk(KERN_DEBUG "%s: selected %s (%dns) (%04X)\n", drive->name,
93 ide_xfer_verbose(pio + XFER_PIO_0),
94 ide_pio_cycle_time(drive, pio), drv_ctrl);
98 * Configure the chipset for DMA mode.
100 static void sl82c105_set_dma_mode(ide_drive_t *drive, const u8 speed)
102 static u16 mwdma_timings[] = {0x0707, 0x0201, 0x0200};
105 DBG(("sl82c105_tune_chipset(drive:%s, speed:%s)\n",
106 drive->name, ide_xfer_verbose(speed)));
108 drv_ctrl = mwdma_timings[speed - XFER_MW_DMA_0];
111 * Store the DMA timings so that we can actually program
112 * them when DMA will be turned on...
114 drive->drive_data &= 0x0000ffff;
115 drive->drive_data |= (unsigned long)drv_ctrl << 16;
119 * The SL82C105 holds off all IDE interrupts while in DMA mode until
120 * all DMA activity is completed. Sometimes this causes problems (eg,
121 * when the drive wants to report an error condition).
123 * 0x7e is a "chip testing" register. Bit 2 resets the DMA controller
124 * state machine. We need to kick this to work around various bugs.
126 static inline void sl82c105_reset_host(struct pci_dev *dev)
130 pci_read_config_word(dev, 0x7e, &val);
131 pci_write_config_word(dev, 0x7e, val | (1 << 2));
132 pci_write_config_word(dev, 0x7e, val & ~(1 << 2));
136 * If we get an IRQ timeout, it might be that the DMA state machine
137 * got confused. Fix from Todd Inglett. Details from Winbond.
139 * This function is called when the IDE timer expires, the drive
140 * indicates that it is READY, and we were waiting for DMA to complete.
142 static void sl82c105_dma_lost_irq(ide_drive_t *drive)
144 ide_hwif_t *hwif = drive->hwif;
145 struct pci_dev *dev = to_pci_dev(hwif->dev);
146 u32 val, mask = hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA;
149 printk(KERN_WARNING "sl82c105: lost IRQ, resetting host\n");
152 * Check the raw interrupt from the drive.
154 pci_read_config_dword(dev, 0x40, &val);
156 printk(KERN_INFO "sl82c105: drive was requesting IRQ, "
157 "but host lost it\n");
160 * Was DMA enabled? If so, disable it - we're resetting the
161 * host. The IDE layer will be handling the drive for us.
163 dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
165 outb(dma_cmd & ~1, hwif->dma_base + ATA_DMA_CMD);
166 printk(KERN_INFO "sl82c105: DMA was enabled\n");
169 sl82c105_reset_host(dev);
173 * ATAPI devices can cause the SL82C105 DMA state machine to go gaga.
174 * Winbond recommend that the DMA state machine is reset prior to
175 * setting the bus master DMA enable bit.
177 * The generic IDE core will have disabled the BMEN bit before this
178 * function is called.
180 static void sl82c105_dma_start(ide_drive_t *drive)
182 ide_hwif_t *hwif = drive->hwif;
183 struct pci_dev *dev = to_pci_dev(hwif->dev);
184 int reg = 0x44 + drive->dn * 4;
186 DBG(("%s(drive:%s)\n", __func__, drive->name));
188 pci_write_config_word(dev, reg, drive->drive_data >> 16);
190 sl82c105_reset_host(dev);
191 ide_dma_start(drive);
194 static void sl82c105_dma_clear(ide_drive_t *drive)
196 struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
198 DBG(("sl82c105_dma_clear(drive:%s)\n", drive->name));
200 sl82c105_reset_host(dev);
203 static int sl82c105_dma_end(ide_drive_t *drive)
205 struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
206 int reg = 0x44 + drive->dn * 4;
209 DBG(("%s(drive:%s)\n", __func__, drive->name));
211 ret = ide_dma_end(drive);
213 pci_write_config_word(dev, reg, drive->drive_data);
219 * ATA reset will clear the 16 bits mode in the control
220 * register, we need to reprogram it
222 static void sl82c105_resetproc(ide_drive_t *drive)
224 struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
227 DBG(("sl82c105_resetproc(drive:%s)\n", drive->name));
229 pci_read_config_dword(dev, 0x40, &val);
230 val |= (CTRL_P1F16 | CTRL_P0F16);
231 pci_write_config_dword(dev, 0x40, val);
235 * Return the revision of the Winbond bridge
236 * which this function is part of.
238 static u8 sl82c105_bridge_revision(struct pci_dev *dev)
240 struct pci_dev *bridge;
243 * The bridge should be part of the same device, but function 0.
245 bridge = pci_get_bus_and_slot(dev->bus->number,
246 PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
251 * Make sure it is a Winbond 553 and is an ISA bridge.
253 if (bridge->vendor != PCI_VENDOR_ID_WINBOND ||
254 bridge->device != PCI_DEVICE_ID_WINBOND_83C553 ||
255 bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) {
260 * We need to find function 0's revision, not function 1
264 return bridge->revision;
268 * Enable the PCI device
270 * --BenH: It's arch fixup code that should enable channels that
271 * have not been enabled by firmware. I decided we can still enable
272 * channel 0 here at least, but channel 1 has to be enabled by
273 * firmware or arch code. We still set both to 16 bits mode.
275 static int init_chipset_sl82c105(struct pci_dev *dev)
279 DBG(("init_chipset_sl82c105()\n"));
281 pci_read_config_dword(dev, 0x40, &val);
282 val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
283 pci_write_config_dword(dev, 0x40, val);
288 static const struct ide_port_ops sl82c105_port_ops = {
289 .set_pio_mode = sl82c105_set_pio_mode,
290 .set_dma_mode = sl82c105_set_dma_mode,
291 .resetproc = sl82c105_resetproc,
294 static const struct ide_dma_ops sl82c105_dma_ops = {
295 .dma_host_set = ide_dma_host_set,
296 .dma_setup = ide_dma_setup,
297 .dma_start = sl82c105_dma_start,
298 .dma_end = sl82c105_dma_end,
299 .dma_test_irq = ide_dma_test_irq,
300 .dma_lost_irq = sl82c105_dma_lost_irq,
301 .dma_timer_expiry = ide_dma_sff_timer_expiry,
302 .dma_clear = sl82c105_dma_clear,
303 .dma_sff_read_status = ide_dma_sff_read_status,
306 static const struct ide_port_info sl82c105_chipset __devinitdata = {
308 .init_chipset = init_chipset_sl82c105,
309 .enablebits = {{0x40,0x01,0x01}, {0x40,0x10,0x10}},
310 .port_ops = &sl82c105_port_ops,
311 .dma_ops = &sl82c105_dma_ops,
312 .host_flags = IDE_HFLAG_IO_32BIT |
313 IDE_HFLAG_UNMASK_IRQS |
314 IDE_HFLAG_SERIALIZE_DMA |
315 IDE_HFLAG_NO_AUTODMA,
316 .pio_mask = ATA_PIO5,
317 .mwdma_mask = ATA_MWDMA2,
320 static int __devinit sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
322 struct ide_port_info d = sl82c105_chipset;
323 u8 rev = sl82c105_bridge_revision(dev);
327 * Never ever EVER under any circumstances enable
328 * DMA when the bridge is this old.
330 printk(KERN_INFO DRV_NAME ": Winbond W83C553 bridge "
331 "revision %d, BM-DMA disabled\n", rev);
334 d.host_flags &= ~IDE_HFLAG_SERIALIZE_DMA;
337 return ide_pci_init_one(dev, &d, NULL);
340 static const struct pci_device_id sl82c105_pci_tbl[] = {
341 { PCI_VDEVICE(WINBOND, PCI_DEVICE_ID_WINBOND_82C105), 0 },
344 MODULE_DEVICE_TABLE(pci, sl82c105_pci_tbl);
346 static struct pci_driver sl82c105_pci_driver = {
347 .name = "W82C105_IDE",
348 .id_table = sl82c105_pci_tbl,
349 .probe = sl82c105_init_one,
350 .remove = ide_pci_remove,
351 .suspend = ide_pci_suspend,
352 .resume = ide_pci_resume,
355 static int __init sl82c105_ide_init(void)
357 return ide_pci_register_driver(&sl82c105_pci_driver);
360 static void __exit sl82c105_ide_exit(void)
362 pci_unregister_driver(&sl82c105_pci_driver);
365 module_init(sl82c105_ide_init);
366 module_exit(sl82c105_ide_exit);
368 MODULE_DESCRIPTION("PCI driver module for W82C105 IDE");
369 MODULE_LICENSE("GPL");