2 * linux/drivers/ide/pci/sl82c105.c
4 * SL82C105/Winbond 553 IDE driver
8 * Drive tuning added from Rebel.com's kernel sources
9 * -- Russell King (15/11/98) linux@arm.linux.org.uk
11 * Merge in Russell's HW workarounds, fix various problems
12 * with the timing registers setup.
13 * -- Benjamin Herrenschmidt (01/11/03) benh@kernel.crashing.org
15 * Copyright (C) 2006-2007 MontaVista Software, Inc. <source@mvista.com>
18 #include <linux/types.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/timer.h>
23 #include <linux/ioport.h>
24 #include <linux/interrupt.h>
25 #include <linux/blkdev.h>
26 #include <linux/hdreg.h>
27 #include <linux/pci.h>
28 #include <linux/ide.h>
36 #define DBG(arg) printk arg
41 * SL82C105 PCI config register 0x40 bits.
43 #define CTRL_IDE_IRQB (1 << 30)
44 #define CTRL_IDE_IRQA (1 << 28)
45 #define CTRL_LEGIRQ (1 << 11)
46 #define CTRL_P1F16 (1 << 5)
47 #define CTRL_P1EN (1 << 4)
48 #define CTRL_P0F16 (1 << 1)
49 #define CTRL_P0EN (1 << 0)
52 * Convert a PIO mode and cycle time to the required on/off times
53 * for the interface. This has protection against runaway timings.
55 static unsigned int get_pio_timings(ide_pio_data_t *p)
57 unsigned int cmd_on, cmd_off;
59 cmd_on = (ide_pio_timings[p->pio_mode].active_time + 29) / 30;
60 cmd_off = (p->cycle_time - 30 * cmd_on + 29) / 30;
68 return (cmd_on - 1) << 8 | (cmd_off - 1) | (p->use_iordy ? 0x40 : 0x00);
72 * Configure the chipset for PIO mode.
74 static u8 sl82c105_tune_pio(ide_drive_t *drive, u8 pio)
76 struct pci_dev *dev = HWIF(drive)->pci_dev;
77 int reg = 0x44 + drive->dn * 4;
81 DBG(("sl82c105_tune_pio(drive:%s, pio:%u)\n", drive->name, pio));
83 pio = ide_get_best_pio_mode(drive, pio, 5, &p);
85 drive->drive_data = drv_ctrl = get_pio_timings(&p);
87 if (!drive->using_dma) {
89 * If we are actually using MW DMA, then we can not
90 * reprogram the interface drive control register.
92 pci_write_config_word(dev, reg, drv_ctrl);
93 pci_read_config_word (dev, reg, &drv_ctrl);
96 printk(KERN_DEBUG "%s: selected %s (%dns) (%04X)\n", drive->name,
97 ide_xfer_verbose(pio + XFER_PIO_0), p.cycle_time, drv_ctrl);
103 * Configure the drive for DMA.
104 * We'll program the chipset only when DMA is actually turned on.
106 static int config_for_dma(ide_drive_t *drive)
108 DBG(("config_for_dma(drive:%s)\n", drive->name));
110 if (ide_config_drive_speed(drive, XFER_MW_DMA_2) != 0)
113 return ide_dma_enable(drive);
117 * Check to see if the drive and chipset are capable of DMA mode.
119 static int sl82c105_ide_dma_check(ide_drive_t *drive)
121 DBG(("sl82c105_ide_dma_check(drive:%s)\n", drive->name));
123 if (ide_use_dma(drive) && config_for_dma(drive))
130 * The SL82C105 holds off all IDE interrupts while in DMA mode until
131 * all DMA activity is completed. Sometimes this causes problems (eg,
132 * when the drive wants to report an error condition).
134 * 0x7e is a "chip testing" register. Bit 2 resets the DMA controller
135 * state machine. We need to kick this to work around various bugs.
137 static inline void sl82c105_reset_host(struct pci_dev *dev)
141 pci_read_config_word(dev, 0x7e, &val);
142 pci_write_config_word(dev, 0x7e, val | (1 << 2));
143 pci_write_config_word(dev, 0x7e, val & ~(1 << 2));
147 * If we get an IRQ timeout, it might be that the DMA state machine
148 * got confused. Fix from Todd Inglett. Details from Winbond.
150 * This function is called when the IDE timer expires, the drive
151 * indicates that it is READY, and we were waiting for DMA to complete.
153 static int sl82c105_ide_dma_lostirq(ide_drive_t *drive)
155 ide_hwif_t *hwif = HWIF(drive);
156 struct pci_dev *dev = hwif->pci_dev;
157 u32 val, mask = hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA;
160 printk("sl82c105: lost IRQ, resetting host\n");
163 * Check the raw interrupt from the drive.
165 pci_read_config_dword(dev, 0x40, &val);
167 printk("sl82c105: drive was requesting IRQ, but host lost it\n");
170 * Was DMA enabled? If so, disable it - we're resetting the
171 * host. The IDE layer will be handling the drive for us.
173 dma_cmd = inb(hwif->dma_command);
175 outb(dma_cmd & ~1, hwif->dma_command);
176 printk("sl82c105: DMA was enabled\n");
179 sl82c105_reset_host(dev);
181 /* __ide_dma_lostirq would return 1, so we do as well */
186 * ATAPI devices can cause the SL82C105 DMA state machine to go gaga.
187 * Winbond recommend that the DMA state machine is reset prior to
188 * setting the bus master DMA enable bit.
190 * The generic IDE core will have disabled the BMEN bit before this
191 * function is called.
193 static void sl82c105_dma_start(ide_drive_t *drive)
195 ide_hwif_t *hwif = HWIF(drive);
196 struct pci_dev *dev = hwif->pci_dev;
198 sl82c105_reset_host(dev);
199 ide_dma_start(drive);
202 static int sl82c105_ide_dma_timeout(ide_drive_t *drive)
204 ide_hwif_t *hwif = HWIF(drive);
205 struct pci_dev *dev = hwif->pci_dev;
207 DBG(("sl82c105_ide_dma_timeout(drive:%s)\n", drive->name));
209 sl82c105_reset_host(dev);
210 return __ide_dma_timeout(drive);
213 static int sl82c105_ide_dma_on(ide_drive_t *drive)
215 struct pci_dev *dev = HWIF(drive)->pci_dev;
216 int rc, reg = 0x44 + drive->dn * 4;
218 DBG(("sl82c105_ide_dma_on(drive:%s)\n", drive->name));
220 rc = __ide_dma_on(drive);
222 pci_write_config_word(dev, reg, 0x0200);
224 printk(KERN_INFO "%s: DMA enabled\n", drive->name);
229 static void sl82c105_dma_off_quietly(ide_drive_t *drive)
231 struct pci_dev *dev = HWIF(drive)->pci_dev;
232 int reg = 0x44 + drive->dn * 4;
234 DBG(("sl82c105_dma_off_quietly(drive:%s)\n", drive->name));
236 pci_write_config_word(dev, reg, drive->drive_data);
238 ide_dma_off_quietly(drive);
242 * Ok, that is nasty, but we must make sure the DMA timings
243 * won't be used for a PIO access. The solution here is
244 * to make sure the 16 bits mode is diabled on the channel
245 * when DMA is enabled, thus causing the chip to use PIO0
246 * timings for those operations.
248 static void sl82c105_selectproc(ide_drive_t *drive)
250 ide_hwif_t *hwif = HWIF(drive);
251 struct pci_dev *dev = hwif->pci_dev;
254 //DBG(("sl82c105_selectproc(drive:%s)\n", drive->name));
256 mask = hwif->channel ? CTRL_P1F16 : CTRL_P0F16;
257 old = val = (u32)pci_get_drvdata(dev);
258 if (drive->using_dma)
263 pci_write_config_dword(dev, 0x40, val);
264 pci_set_drvdata(dev, (void *)val);
269 * ATA reset will clear the 16 bits mode in the control
270 * register, we need to update our cache
272 static void sl82c105_resetproc(ide_drive_t *drive)
274 struct pci_dev *dev = HWIF(drive)->pci_dev;
277 DBG(("sl82c105_resetproc(drive:%s)\n", drive->name));
279 pci_read_config_dword(dev, 0x40, &val);
280 pci_set_drvdata(dev, (void *)val);
284 * We only deal with PIO mode here - DMA mode 'using_dma' is not
285 * initialised at the point that this function is called.
287 static void sl82c105_tune_drive(ide_drive_t *drive, u8 pio)
289 DBG(("sl82c105_tune_drive(drive:%s, pio:%u)\n", drive->name, pio));
291 pio = sl82c105_tune_pio(drive, pio);
292 (void) ide_config_drive_speed(drive, XFER_PIO_0 + pio);
296 * Return the revision of the Winbond bridge
297 * which this function is part of.
299 static unsigned int sl82c105_bridge_revision(struct pci_dev *dev)
301 struct pci_dev *bridge;
305 * The bridge should be part of the same device, but function 0.
307 bridge = pci_find_slot(dev->bus->number,
308 PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
313 * Make sure it is a Winbond 553 and is an ISA bridge.
315 if (bridge->vendor != PCI_VENDOR_ID_WINBOND ||
316 bridge->device != PCI_DEVICE_ID_WINBOND_83C553 ||
317 bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA)
321 * We need to find function 0's revision, not function 1
323 pci_read_config_byte(bridge, PCI_REVISION_ID, &rev);
329 * Enable the PCI device
331 * --BenH: It's arch fixup code that should enable channels that
332 * have not been enabled by firmware. I decided we can still enable
333 * channel 0 here at least, but channel 1 has to be enabled by
334 * firmware or arch code. We still set both to 16 bits mode.
336 static unsigned int __devinit init_chipset_sl82c105(struct pci_dev *dev, const char *msg)
340 DBG(("init_chipset_sl82c105()\n"));
342 pci_read_config_dword(dev, 0x40, &val);
343 val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
344 pci_write_config_dword(dev, 0x40, val);
345 pci_set_drvdata(dev, (void *)val);
351 * Initialise IDE channel
353 static void __devinit init_hwif_sl82c105(ide_hwif_t *hwif)
357 DBG(("init_hwif_sl82c105(hwif: ide%d)\n", hwif->index));
359 hwif->tuneproc = &sl82c105_tune_drive;
360 hwif->selectproc = &sl82c105_selectproc;
361 hwif->resetproc = &sl82c105_resetproc;
364 * We support 32-bit I/O on this interface, and
365 * it doesn't have problems with interrupts.
367 hwif->drives[0].io_32bit = hwif->drives[1].io_32bit = 1;
368 hwif->drives[0].unmask = hwif->drives[1].unmask = 1;
371 * We always autotune PIO, this is done before DMA is checked,
372 * so there's no risk of accidentally disabling DMA
374 hwif->drives[0].autotune = hwif->drives[1].autotune = 1;
379 rev = sl82c105_bridge_revision(hwif->pci_dev);
382 * Never ever EVER under any circumstances enable
383 * DMA when the bridge is this old.
385 printk(" %s: Winbond W83C553 bridge revision %d, "
386 "BM-DMA disabled\n", hwif->name, rev);
391 hwif->mwdma_mask = 0x04;
393 hwif->ide_dma_check = &sl82c105_ide_dma_check;
394 hwif->ide_dma_on = &sl82c105_ide_dma_on;
395 hwif->dma_off_quietly = &sl82c105_dma_off_quietly;
396 hwif->ide_dma_lostirq = &sl82c105_ide_dma_lostirq;
397 hwif->dma_start = &sl82c105_dma_start;
398 hwif->ide_dma_timeout = &sl82c105_ide_dma_timeout;
402 hwif->drives[0].autodma = hwif->drives[1].autodma = hwif->autodma;
405 hwif->serialized = hwif->mate->serialized = 1;
408 static ide_pci_device_t sl82c105_chipset __devinitdata = {
410 .init_chipset = init_chipset_sl82c105,
411 .init_hwif = init_hwif_sl82c105,
413 .autodma = NOAUTODMA,
414 .enablebits = {{0x40,0x01,0x01}, {0x40,0x10,0x10}},
415 .bootable = ON_BOARD,
418 static int __devinit sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
420 return ide_setup_pci_device(dev, &sl82c105_chipset);
423 static struct pci_device_id sl82c105_pci_tbl[] = {
424 { PCI_DEVICE(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105), 0},
427 MODULE_DEVICE_TABLE(pci, sl82c105_pci_tbl);
429 static struct pci_driver driver = {
430 .name = "W82C105_IDE",
431 .id_table = sl82c105_pci_tbl,
432 .probe = sl82c105_init_one,
435 static int __init sl82c105_ide_init(void)
437 return ide_pci_register_driver(&driver);
440 module_init(sl82c105_ide_init);
442 MODULE_DESCRIPTION("PCI driver module for W82C105 IDE");
443 MODULE_LICENSE("GPL");