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
16 #include <linux/types.h>
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/timer.h>
21 #include <linux/ioport.h>
22 #include <linux/interrupt.h>
23 #include <linux/blkdev.h>
24 #include <linux/hdreg.h>
25 #include <linux/pci.h>
26 #include <linux/ide.h>
34 #define DBG(arg) printk arg
39 * SL82C105 PCI config register 0x40 bits.
41 #define CTRL_IDE_IRQB (1 << 30)
42 #define CTRL_IDE_IRQA (1 << 28)
43 #define CTRL_LEGIRQ (1 << 11)
44 #define CTRL_P1F16 (1 << 5)
45 #define CTRL_P1EN (1 << 4)
46 #define CTRL_P0F16 (1 << 1)
47 #define CTRL_P0EN (1 << 0)
50 * Convert a PIO mode and cycle time to the required on/off
51 * times for the interface. This has protection against run-away
54 static unsigned int get_timing_sl82c105(ide_pio_data_t *p)
59 cmd_on = (ide_pio_timings[p->pio_mode].active_time + 29) / 30;
60 cmd_off = (p->cycle_time - 30 * cmd_on + 29) / 30;
72 return (cmd_on - 1) << 8 | (cmd_off - 1) | (p->use_iordy ? 0x40 : 0x00);
76 * Configure the drive and chipset for PIO
78 static void config_for_pio(ide_drive_t *drive, int pio, int report, int chipset_only)
80 ide_hwif_t *hwif = HWIF(drive);
81 struct pci_dev *dev = hwif->pci_dev;
84 unsigned int xfer_mode, reg;
86 DBG(("config_for_pio(drive:%s, pio:%d, report:%d, chipset_only:%d)\n",
87 drive->name, pio, report, chipset_only));
89 reg = (hwif->channel ? 0x4c : 0x44) + (drive->select.b.unit ? 4 : 0);
91 pio = ide_get_best_pio_mode(drive, pio, 5, &p);
93 xfer_mode = XFER_PIO_0 + pio;
95 if (chipset_only || ide_config_drive_speed(drive, xfer_mode) == 0) {
96 drv_ctrl = get_timing_sl82c105(&p);
97 drive->pio_speed = xfer_mode;
99 drive->pio_speed = XFER_PIO_0;
101 if (drive->using_dma == 0) {
103 * If we are actually using MW DMA, then we can not
104 * reprogram the interface drive control register.
106 pci_write_config_word(dev, reg, drv_ctrl);
107 pci_read_config_word(dev, reg, &drv_ctrl);
110 printk("%s: selected %s (%dns) (%04X)\n", drive->name,
111 ide_xfer_verbose(xfer_mode), p.cycle_time, drv_ctrl);
117 * Configure the drive and the chipset for DMA
119 static int config_for_dma (ide_drive_t *drive)
121 ide_hwif_t *hwif = HWIF(drive);
122 struct pci_dev *dev = hwif->pci_dev;
125 DBG(("config_for_dma(drive:%s)\n", drive->name));
127 reg = (hwif->channel ? 0x4c : 0x44) + (drive->select.b.unit ? 4 : 0);
129 if (ide_config_drive_speed(drive, XFER_MW_DMA_2) != 0)
132 pci_write_config_word(dev, reg, 0x0240);
138 * Check to see if the drive and
139 * chipset is capable of DMA mode
142 static int sl82c105_check_drive (ide_drive_t *drive)
144 ide_hwif_t *hwif = HWIF(drive);
146 DBG(("sl82c105_check_drive(drive:%s)\n", drive->name));
149 struct hd_driveid *id = drive->id;
154 if (!id || !(id->capability & 1))
157 /* Consult the list of known "bad" drives */
158 if (__ide_dma_bad_drive(drive))
161 if (id->field_valid & 2) {
162 if ((id->dma_mword & hwif->mwdma_mask) ||
163 (id->dma_1word & hwif->swdma_mask))
167 if (__ide_dma_good_drive(drive) && id->eide_dma_time < 150)
175 * The SL82C105 holds off all IDE interrupts while in DMA mode until
176 * all DMA activity is completed. Sometimes this causes problems (eg,
177 * when the drive wants to report an error condition).
179 * 0x7e is a "chip testing" register. Bit 2 resets the DMA controller
180 * state machine. We need to kick this to work around various bugs.
182 static inline void sl82c105_reset_host(struct pci_dev *dev)
186 pci_read_config_word(dev, 0x7e, &val);
187 pci_write_config_word(dev, 0x7e, val | (1 << 2));
188 pci_write_config_word(dev, 0x7e, val & ~(1 << 2));
192 * If we get an IRQ timeout, it might be that the DMA state machine
193 * got confused. Fix from Todd Inglett. Details from Winbond.
195 * This function is called when the IDE timer expires, the drive
196 * indicates that it is READY, and we were waiting for DMA to complete.
198 static int sl82c105_ide_dma_lost_irq(ide_drive_t *drive)
200 ide_hwif_t *hwif = HWIF(drive);
201 struct pci_dev *dev = hwif->pci_dev;
202 u32 val, mask = hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA;
203 unsigned long dma_base = hwif->dma_base;
205 printk("sl82c105: lost IRQ: resetting host\n");
208 * Check the raw interrupt from the drive.
210 pci_read_config_dword(dev, 0x40, &val);
212 printk("sl82c105: drive was requesting IRQ, but host lost it\n");
215 * Was DMA enabled? If so, disable it - we're resetting the
216 * host. The IDE layer will be handling the drive for us.
220 outb(val & ~1, dma_base);
221 printk("sl82c105: DMA was enabled\n");
224 sl82c105_reset_host(dev);
226 /* ide_dmaproc would return 1, so we do as well */
231 * ATAPI devices can cause the SL82C105 DMA state machine to go gaga.
232 * Winbond recommend that the DMA state machine is reset prior to
233 * setting the bus master DMA enable bit.
235 * The generic IDE core will have disabled the BMEN bit before this
236 * function is called.
238 static void sl82c105_ide_dma_start(ide_drive_t *drive)
240 ide_hwif_t *hwif = HWIF(drive);
241 struct pci_dev *dev = hwif->pci_dev;
243 sl82c105_reset_host(dev);
244 ide_dma_start(drive);
247 static int sl82c105_ide_dma_timeout(ide_drive_t *drive)
249 ide_hwif_t *hwif = HWIF(drive);
250 struct pci_dev *dev = hwif->pci_dev;
252 DBG(("sl82c105_ide_dma_timeout(drive:%s)\n", drive->name));
254 sl82c105_reset_host(dev);
255 return __ide_dma_timeout(drive);
258 static int sl82c105_ide_dma_on (ide_drive_t *drive)
260 DBG(("sl82c105_ide_dma_on(drive:%s)\n", drive->name));
262 if (config_for_dma(drive))
264 printk(KERN_INFO "%s: DMA enabled\n", drive->name);
265 return __ide_dma_on(drive);
268 static void sl82c105_dma_off_quietly(ide_drive_t *drive)
270 u8 speed = XFER_PIO_0;
272 DBG(("sl82c105_dma_off_quietly(drive:%s)\n", drive->name));
274 ide_dma_off_quietly(drive);
275 if (drive->pio_speed)
276 speed = drive->pio_speed - XFER_PIO_0;
277 config_for_pio(drive, speed, 0, 1);
281 * Ok, that is nasty, but we must make sure the DMA timings
282 * won't be used for a PIO access. The solution here is
283 * to make sure the 16 bits mode is diabled on the channel
284 * when DMA is enabled, thus causing the chip to use PIO0
285 * timings for those operations.
287 static void sl82c105_selectproc(ide_drive_t *drive)
289 ide_hwif_t *hwif = HWIF(drive);
290 struct pci_dev *dev = hwif->pci_dev;
293 //DBG(("sl82c105_selectproc(drive:%s)\n", drive->name));
295 mask = hwif->channel ? CTRL_P1F16 : CTRL_P0F16;
296 old = val = (u32)pci_get_drvdata(dev);
297 if (drive->using_dma)
302 pci_write_config_dword(dev, 0x40, val);
303 pci_set_drvdata(dev, (void *)val);
308 * ATA reset will clear the 16 bits mode in the control
309 * register, we need to update our cache
311 static void sl82c105_resetproc(ide_drive_t *drive)
313 struct pci_dev *dev = HWIF(drive)->pci_dev;
316 DBG(("sl82c105_resetproc(drive:%s)\n", drive->name));
318 pci_read_config_dword(dev, 0x40, &val);
319 pci_set_drvdata(dev, (void *)val);
323 * We only deal with PIO mode here - DMA mode 'using_dma' is not
324 * initialised at the point that this function is called.
326 static void tune_sl82c105(ide_drive_t *drive, u8 pio)
328 DBG(("tune_sl82c105(drive:%s)\n", drive->name));
330 config_for_pio(drive, pio, 1, 0);
333 * We support 32-bit I/O on this interface, and it
334 * doesn't have problems with interrupts.
341 * Return the revision of the Winbond bridge
342 * which this function is part of.
344 static unsigned int sl82c105_bridge_revision(struct pci_dev *dev)
346 struct pci_dev *bridge;
350 * The bridge should be part of the same device, but function 0.
352 bridge = pci_find_slot(dev->bus->number,
353 PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
358 * Make sure it is a Winbond 553 and is an ISA bridge.
360 if (bridge->vendor != PCI_VENDOR_ID_WINBOND ||
361 bridge->device != PCI_DEVICE_ID_WINBOND_83C553 ||
362 bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA)
366 * We need to find function 0's revision, not function 1
368 pci_read_config_byte(bridge, PCI_REVISION_ID, &rev);
374 * Enable the PCI device
376 * --BenH: It's arch fixup code that should enable channels that
377 * have not been enabled by firmware. I decided we can still enable
378 * channel 0 here at least, but channel 1 has to be enabled by
379 * firmware or arch code. We still set both to 16 bits mode.
381 static unsigned int __devinit init_chipset_sl82c105(struct pci_dev *dev, const char *msg)
385 DBG(("init_chipset_sl82c105()\n"));
387 pci_read_config_dword(dev, 0x40, &val);
388 val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
389 pci_write_config_dword(dev, 0x40, val);
390 pci_set_drvdata(dev, (void *)val);
396 * Initialise the chip
398 static void __devinit init_hwif_sl82c105(ide_hwif_t *hwif)
402 DBG(("init_hwif_sl82c105(hwif: ide%d)\n", hwif->index));
404 hwif->tuneproc = tune_sl82c105;
405 hwif->selectproc = sl82c105_selectproc;
406 hwif->resetproc = sl82c105_resetproc;
409 * Default to PIO 0 for fallback unless tuned otherwise.
410 * We always autotune PIO, this is done before DMA is checked,
411 * so there's no risk of accidentally disabling DMA
413 hwif->drives[0].pio_speed = XFER_PIO_0;
414 hwif->drives[0].autotune = 1;
415 hwif->drives[1].pio_speed = XFER_PIO_0;
416 hwif->drives[1].autotune = 1;
419 hwif->mwdma_mask = 0;
420 hwif->swdma_mask = 0;
426 rev = sl82c105_bridge_revision(hwif->pci_dev);
429 * Never ever EVER under any circumstances enable
430 * DMA when the bridge is this old.
432 printk(" %s: Winbond 553 bridge revision %d, BM-DMA disabled\n",
436 hwif->mwdma_mask = 0x04;
438 hwif->ide_dma_check = &sl82c105_check_drive;
439 hwif->ide_dma_on = &sl82c105_ide_dma_on;
440 hwif->dma_off_quietly = &sl82c105_dma_off_quietly;
441 hwif->ide_dma_lostirq = &sl82c105_ide_dma_lost_irq;
442 hwif->dma_start = &sl82c105_ide_dma_start;
443 hwif->ide_dma_timeout = &sl82c105_ide_dma_timeout;
447 hwif->drives[0].autodma = hwif->autodma;
448 hwif->drives[1].autodma = hwif->autodma;
451 hwif->serialized = hwif->mate->serialized = 1;
455 static ide_pci_device_t sl82c105_chipset __devinitdata = {
457 .init_chipset = init_chipset_sl82c105,
458 .init_hwif = init_hwif_sl82c105,
460 .autodma = NOAUTODMA,
461 .enablebits = {{0x40,0x01,0x01}, {0x40,0x10,0x10}},
462 .bootable = ON_BOARD,
465 static int __devinit sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
467 return ide_setup_pci_device(dev, &sl82c105_chipset);
470 static struct pci_device_id sl82c105_pci_tbl[] = {
471 { PCI_DEVICE(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105), 0},
474 MODULE_DEVICE_TABLE(pci, sl82c105_pci_tbl);
476 static struct pci_driver driver = {
477 .name = "W82C105_IDE",
478 .id_table = sl82c105_pci_tbl,
479 .probe = sl82c105_init_one,
482 static int __init sl82c105_ide_init(void)
484 return ide_pci_register_driver(&driver);
487 module_init(sl82c105_ide_init);
489 MODULE_DESCRIPTION("PCI driver module for W82C105 IDE");
490 MODULE_LICENSE("GPL");