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 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/hdreg.h>
21 #include <linux/pci.h>
22 #include <linux/ide.h>
29 #define DBG(arg) printk arg
34 * SL82C105 PCI config register 0x40 bits.
36 #define CTRL_IDE_IRQB (1 << 30)
37 #define CTRL_IDE_IRQA (1 << 28)
38 #define CTRL_LEGIRQ (1 << 11)
39 #define CTRL_P1F16 (1 << 5)
40 #define CTRL_P1EN (1 << 4)
41 #define CTRL_P0F16 (1 << 1)
42 #define CTRL_P0EN (1 << 0)
45 * Convert a PIO mode and cycle time to the required on/off times
46 * for the interface. This has protection against runaway timings.
48 static unsigned int get_pio_timings(ide_drive_t *drive, u8 pio)
50 unsigned int cmd_on, cmd_off;
53 cmd_on = (ide_pio_timings[pio].active_time + 29) / 30;
54 cmd_off = (ide_pio_cycle_time(drive, pio) - 30 * cmd_on + 29) / 30;
62 if (pio > 2 || ide_dev_has_iordy(drive->id))
65 return (cmd_on - 1) << 8 | (cmd_off - 1) | iordy;
69 * Configure the chipset for PIO mode.
71 static void sl82c105_set_pio_mode(ide_drive_t *drive, const u8 pio)
73 struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
74 int reg = 0x44 + drive->dn * 4;
77 drv_ctrl = get_pio_timings(drive, pio);
80 * Store the PIO timings so that we can restore them
81 * in case DMA will be turned off...
83 drive->drive_data &= 0xffff0000;
84 drive->drive_data |= drv_ctrl;
86 pci_write_config_word(dev, reg, drv_ctrl);
87 pci_read_config_word (dev, reg, &drv_ctrl);
89 printk(KERN_DEBUG "%s: selected %s (%dns) (%04X)\n", drive->name,
90 ide_xfer_verbose(pio + XFER_PIO_0),
91 ide_pio_cycle_time(drive, pio), drv_ctrl);
95 * Configure the chipset for DMA mode.
97 static void sl82c105_set_dma_mode(ide_drive_t *drive, const u8 speed)
99 static u16 mwdma_timings[] = {0x0707, 0x0201, 0x0200};
102 DBG(("sl82c105_tune_chipset(drive:%s, speed:%s)\n",
103 drive->name, ide_xfer_verbose(speed)));
105 drv_ctrl = mwdma_timings[speed - XFER_MW_DMA_0];
108 * Store the DMA timings so that we can actually program
109 * them when DMA will be turned on...
111 drive->drive_data &= 0x0000ffff;
112 drive->drive_data |= (unsigned long)drv_ctrl << 16;
116 * The SL82C105 holds off all IDE interrupts while in DMA mode until
117 * all DMA activity is completed. Sometimes this causes problems (eg,
118 * when the drive wants to report an error condition).
120 * 0x7e is a "chip testing" register. Bit 2 resets the DMA controller
121 * state machine. We need to kick this to work around various bugs.
123 static inline void sl82c105_reset_host(struct pci_dev *dev)
127 pci_read_config_word(dev, 0x7e, &val);
128 pci_write_config_word(dev, 0x7e, val | (1 << 2));
129 pci_write_config_word(dev, 0x7e, val & ~(1 << 2));
133 * If we get an IRQ timeout, it might be that the DMA state machine
134 * got confused. Fix from Todd Inglett. Details from Winbond.
136 * This function is called when the IDE timer expires, the drive
137 * indicates that it is READY, and we were waiting for DMA to complete.
139 static void sl82c105_dma_lost_irq(ide_drive_t *drive)
141 ide_hwif_t *hwif = HWIF(drive);
142 struct pci_dev *dev = to_pci_dev(hwif->dev);
143 u32 val, mask = hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA;
146 printk("sl82c105: lost IRQ, resetting host\n");
149 * Check the raw interrupt from the drive.
151 pci_read_config_dword(dev, 0x40, &val);
153 printk("sl82c105: drive was requesting IRQ, but host lost it\n");
156 * Was DMA enabled? If so, disable it - we're resetting the
157 * host. The IDE layer will be handling the drive for us.
159 dma_cmd = inb(hwif->dma_command);
161 outb(dma_cmd & ~1, hwif->dma_command);
162 printk("sl82c105: DMA was enabled\n");
165 sl82c105_reset_host(dev);
169 * ATAPI devices can cause the SL82C105 DMA state machine to go gaga.
170 * Winbond recommend that the DMA state machine is reset prior to
171 * setting the bus master DMA enable bit.
173 * The generic IDE core will have disabled the BMEN bit before this
174 * function is called.
176 static void sl82c105_dma_start(ide_drive_t *drive)
178 ide_hwif_t *hwif = HWIF(drive);
179 struct pci_dev *dev = to_pci_dev(hwif->dev);
180 int reg = 0x44 + drive->dn * 4;
182 DBG(("%s(drive:%s)\n", __FUNCTION__, drive->name));
184 pci_write_config_word(dev, reg, drive->drive_data >> 16);
186 sl82c105_reset_host(dev);
187 ide_dma_start(drive);
190 static void sl82c105_dma_timeout(ide_drive_t *drive)
192 struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
194 DBG(("sl82c105_dma_timeout(drive:%s)\n", drive->name));
196 sl82c105_reset_host(dev);
197 ide_dma_timeout(drive);
200 static int sl82c105_dma_end(ide_drive_t *drive)
202 struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
203 int reg = 0x44 + drive->dn * 4;
206 DBG(("%s(drive:%s)\n", __FUNCTION__, drive->name));
208 ret = __ide_dma_end(drive);
210 pci_write_config_word(dev, reg, drive->drive_data);
216 * ATA reset will clear the 16 bits mode in the control
217 * register, we need to reprogram it
219 static void sl82c105_resetproc(ide_drive_t *drive)
221 struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
224 DBG(("sl82c105_resetproc(drive:%s)\n", drive->name));
226 pci_read_config_dword(dev, 0x40, &val);
227 val |= (CTRL_P1F16 | CTRL_P0F16);
228 pci_write_config_dword(dev, 0x40, val);
232 * Return the revision of the Winbond bridge
233 * which this function is part of.
235 static unsigned int sl82c105_bridge_revision(struct pci_dev *dev)
237 struct pci_dev *bridge;
240 * The bridge should be part of the same device, but function 0.
242 bridge = pci_get_bus_and_slot(dev->bus->number,
243 PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
248 * Make sure it is a Winbond 553 and is an ISA bridge.
250 if (bridge->vendor != PCI_VENDOR_ID_WINBOND ||
251 bridge->device != PCI_DEVICE_ID_WINBOND_83C553 ||
252 bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) {
257 * We need to find function 0's revision, not function 1
261 return bridge->revision;
265 * Enable the PCI device
267 * --BenH: It's arch fixup code that should enable channels that
268 * have not been enabled by firmware. I decided we can still enable
269 * channel 0 here at least, but channel 1 has to be enabled by
270 * firmware or arch code. We still set both to 16 bits mode.
272 static unsigned int __devinit init_chipset_sl82c105(struct pci_dev *dev, const char *msg)
276 DBG(("init_chipset_sl82c105()\n"));
278 pci_read_config_dword(dev, 0x40, &val);
279 val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
280 pci_write_config_dword(dev, 0x40, val);
286 * Initialise IDE channel
288 static void __devinit init_hwif_sl82c105(ide_hwif_t *hwif)
290 struct pci_dev *dev = to_pci_dev(hwif->dev);
293 DBG(("init_hwif_sl82c105(hwif: ide%d)\n", hwif->index));
295 hwif->set_pio_mode = &sl82c105_set_pio_mode;
296 hwif->set_dma_mode = &sl82c105_set_dma_mode;
297 hwif->resetproc = &sl82c105_resetproc;
302 rev = sl82c105_bridge_revision(dev);
305 * Never ever EVER under any circumstances enable
306 * DMA when the bridge is this old.
308 printk(" %s: Winbond W83C553 bridge revision %d, "
309 "BM-DMA disabled\n", hwif->name, rev);
313 hwif->mwdma_mask = ATA_MWDMA2;
315 hwif->dma_lost_irq = &sl82c105_dma_lost_irq;
316 hwif->dma_start = &sl82c105_dma_start;
317 hwif->ide_dma_end = &sl82c105_dma_end;
318 hwif->dma_timeout = &sl82c105_dma_timeout;
321 hwif->serialized = hwif->mate->serialized = 1;
324 static const struct ide_port_info sl82c105_chipset __devinitdata = {
326 .init_chipset = init_chipset_sl82c105,
327 .init_hwif = init_hwif_sl82c105,
328 .enablebits = {{0x40,0x01,0x01}, {0x40,0x10,0x10}},
329 .host_flags = IDE_HFLAG_IO_32BIT |
330 IDE_HFLAG_UNMASK_IRQS |
331 IDE_HFLAG_NO_AUTODMA |
333 .pio_mask = ATA_PIO5,
336 static int __devinit sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
338 return ide_setup_pci_device(dev, &sl82c105_chipset);
341 static const struct pci_device_id sl82c105_pci_tbl[] = {
342 { PCI_VDEVICE(WINBOND, PCI_DEVICE_ID_WINBOND_82C105), 0 },
345 MODULE_DEVICE_TABLE(pci, sl82c105_pci_tbl);
347 static struct pci_driver driver = {
348 .name = "W82C105_IDE",
349 .id_table = sl82c105_pci_tbl,
350 .probe = sl82c105_init_one,
353 static int __init sl82c105_ide_init(void)
355 return ide_pci_register_driver(&driver);
358 module_init(sl82c105_ide_init);
360 MODULE_DESCRIPTION("PCI driver module for W82C105 IDE");
361 MODULE_LICENSE("GPL");