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_drive_t *drive, u8 pio)
57 unsigned int cmd_on, cmd_off;
60 cmd_on = (ide_pio_timings[pio].active_time + 29) / 30;
61 cmd_off = (ide_pio_cycle_time(drive, pio) - 30 * cmd_on + 29) / 30;
69 if (pio > 2 || ide_dev_has_iordy(drive->id))
72 return (cmd_on - 1) << 8 | (cmd_off - 1) | iordy;
76 * Configure the chipset for PIO mode.
78 static void sl82c105_set_pio_mode(ide_drive_t *drive, const u8 pio)
80 struct pci_dev *dev = HWIF(drive)->pci_dev;
81 int reg = 0x44 + drive->dn * 4;
84 drv_ctrl = get_pio_timings(drive, pio);
87 * Store the PIO timings so that we can restore them
88 * in case DMA will be turned off...
90 drive->drive_data &= 0xffff0000;
91 drive->drive_data |= drv_ctrl;
93 if (!drive->using_dma) {
95 * If we are actually using MW DMA, then we can not
96 * reprogram the interface drive control register.
98 pci_write_config_word(dev, reg, drv_ctrl);
99 pci_read_config_word (dev, reg, &drv_ctrl);
102 printk(KERN_DEBUG "%s: selected %s (%dns) (%04X)\n", drive->name,
103 ide_xfer_verbose(pio + XFER_PIO_0),
104 ide_pio_cycle_time(drive, pio), drv_ctrl);
108 * Configure the chipset for DMA mode.
110 static void sl82c105_set_dma_mode(ide_drive_t *drive, const u8 speed)
112 static u16 mwdma_timings[] = {0x0707, 0x0201, 0x0200};
115 DBG(("sl82c105_tune_chipset(drive:%s, speed:%s)\n",
116 drive->name, ide_xfer_verbose(speed)));
118 drv_ctrl = mwdma_timings[speed - XFER_MW_DMA_0];
121 * Store the DMA timings so that we can actually program
122 * them when DMA will be turned on...
124 drive->drive_data &= 0x0000ffff;
125 drive->drive_data |= (unsigned long)drv_ctrl << 16;
128 * If we are already using DMA, we just reprogram
129 * the drive control register.
131 if (drive->using_dma) {
132 struct pci_dev *dev = HWIF(drive)->pci_dev;
133 int reg = 0x44 + drive->dn * 4;
135 pci_write_config_word(dev, reg, drv_ctrl);
140 * The SL82C105 holds off all IDE interrupts while in DMA mode until
141 * all DMA activity is completed. Sometimes this causes problems (eg,
142 * when the drive wants to report an error condition).
144 * 0x7e is a "chip testing" register. Bit 2 resets the DMA controller
145 * state machine. We need to kick this to work around various bugs.
147 static inline void sl82c105_reset_host(struct pci_dev *dev)
151 pci_read_config_word(dev, 0x7e, &val);
152 pci_write_config_word(dev, 0x7e, val | (1 << 2));
153 pci_write_config_word(dev, 0x7e, val & ~(1 << 2));
157 * If we get an IRQ timeout, it might be that the DMA state machine
158 * got confused. Fix from Todd Inglett. Details from Winbond.
160 * This function is called when the IDE timer expires, the drive
161 * indicates that it is READY, and we were waiting for DMA to complete.
163 static void sl82c105_dma_lost_irq(ide_drive_t *drive)
165 ide_hwif_t *hwif = HWIF(drive);
166 struct pci_dev *dev = hwif->pci_dev;
167 u32 val, mask = hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA;
170 printk("sl82c105: lost IRQ, resetting host\n");
173 * Check the raw interrupt from the drive.
175 pci_read_config_dword(dev, 0x40, &val);
177 printk("sl82c105: drive was requesting IRQ, but host lost it\n");
180 * Was DMA enabled? If so, disable it - we're resetting the
181 * host. The IDE layer will be handling the drive for us.
183 dma_cmd = inb(hwif->dma_command);
185 outb(dma_cmd & ~1, hwif->dma_command);
186 printk("sl82c105: DMA was enabled\n");
189 sl82c105_reset_host(dev);
193 * ATAPI devices can cause the SL82C105 DMA state machine to go gaga.
194 * Winbond recommend that the DMA state machine is reset prior to
195 * setting the bus master DMA enable bit.
197 * The generic IDE core will have disabled the BMEN bit before this
198 * function is called.
200 static void sl82c105_dma_start(ide_drive_t *drive)
202 ide_hwif_t *hwif = HWIF(drive);
203 struct pci_dev *dev = hwif->pci_dev;
205 sl82c105_reset_host(dev);
206 ide_dma_start(drive);
209 static void sl82c105_dma_timeout(ide_drive_t *drive)
211 DBG(("sl82c105_dma_timeout(drive:%s)\n", drive->name));
213 sl82c105_reset_host(HWIF(drive)->pci_dev);
214 ide_dma_timeout(drive);
217 static int sl82c105_ide_dma_on(ide_drive_t *drive)
219 struct pci_dev *dev = HWIF(drive)->pci_dev;
220 int rc, reg = 0x44 + drive->dn * 4;
222 DBG(("sl82c105_ide_dma_on(drive:%s)\n", drive->name));
224 rc = __ide_dma_on(drive);
226 pci_write_config_word(dev, reg, drive->drive_data >> 16);
228 printk(KERN_INFO "%s: DMA enabled\n", drive->name);
233 static void sl82c105_dma_off_quietly(ide_drive_t *drive)
235 struct pci_dev *dev = HWIF(drive)->pci_dev;
236 int reg = 0x44 + drive->dn * 4;
238 DBG(("sl82c105_dma_off_quietly(drive:%s)\n", drive->name));
240 pci_write_config_word(dev, reg, drive->drive_data);
242 ide_dma_off_quietly(drive);
246 * Ok, that is nasty, but we must make sure the DMA timings
247 * won't be used for a PIO access. The solution here is
248 * to make sure the 16 bits mode is diabled on the channel
249 * when DMA is enabled, thus causing the chip to use PIO0
250 * timings for those operations.
252 static void sl82c105_selectproc(ide_drive_t *drive)
254 ide_hwif_t *hwif = HWIF(drive);
255 struct pci_dev *dev = hwif->pci_dev;
258 //DBG(("sl82c105_selectproc(drive:%s)\n", drive->name));
260 mask = hwif->channel ? CTRL_P1F16 : CTRL_P0F16;
261 old = val = (u32)pci_get_drvdata(dev);
262 if (drive->using_dma)
267 pci_write_config_dword(dev, 0x40, val);
268 pci_set_drvdata(dev, (void *)val);
273 * ATA reset will clear the 16 bits mode in the control
274 * register, we need to update our cache
276 static void sl82c105_resetproc(ide_drive_t *drive)
278 struct pci_dev *dev = HWIF(drive)->pci_dev;
281 DBG(("sl82c105_resetproc(drive:%s)\n", drive->name));
283 pci_read_config_dword(dev, 0x40, &val);
284 pci_set_drvdata(dev, (void *)val);
288 * Return the revision of the Winbond bridge
289 * which this function is part of.
291 static unsigned int sl82c105_bridge_revision(struct pci_dev *dev)
293 struct pci_dev *bridge;
296 * The bridge should be part of the same device, but function 0.
298 bridge = pci_get_bus_and_slot(dev->bus->number,
299 PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
304 * Make sure it is a Winbond 553 and is an ISA bridge.
306 if (bridge->vendor != PCI_VENDOR_ID_WINBOND ||
307 bridge->device != PCI_DEVICE_ID_WINBOND_83C553 ||
308 bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) {
313 * We need to find function 0's revision, not function 1
317 return bridge->revision;
321 * Enable the PCI device
323 * --BenH: It's arch fixup code that should enable channels that
324 * have not been enabled by firmware. I decided we can still enable
325 * channel 0 here at least, but channel 1 has to be enabled by
326 * firmware or arch code. We still set both to 16 bits mode.
328 static unsigned int __devinit init_chipset_sl82c105(struct pci_dev *dev, const char *msg)
332 DBG(("init_chipset_sl82c105()\n"));
334 pci_read_config_dword(dev, 0x40, &val);
335 val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
336 pci_write_config_dword(dev, 0x40, val);
337 pci_set_drvdata(dev, (void *)val);
343 * Initialise IDE channel
345 static void __devinit init_hwif_sl82c105(ide_hwif_t *hwif)
349 DBG(("init_hwif_sl82c105(hwif: ide%d)\n", hwif->index));
351 hwif->set_pio_mode = &sl82c105_set_pio_mode;
352 hwif->set_dma_mode = &sl82c105_set_dma_mode;
353 hwif->selectproc = &sl82c105_selectproc;
354 hwif->resetproc = &sl82c105_resetproc;
359 rev = sl82c105_bridge_revision(hwif->pci_dev);
362 * Never ever EVER under any circumstances enable
363 * DMA when the bridge is this old.
365 printk(" %s: Winbond W83C553 bridge revision %d, "
366 "BM-DMA disabled\n", hwif->name, rev);
370 hwif->mwdma_mask = ATA_MWDMA2;
372 hwif->ide_dma_on = &sl82c105_ide_dma_on;
373 hwif->dma_off_quietly = &sl82c105_dma_off_quietly;
374 hwif->dma_lost_irq = &sl82c105_dma_lost_irq;
375 hwif->dma_start = &sl82c105_dma_start;
376 hwif->dma_timeout = &sl82c105_dma_timeout;
379 hwif->serialized = hwif->mate->serialized = 1;
382 static const struct ide_port_info sl82c105_chipset __devinitdata = {
384 .init_chipset = init_chipset_sl82c105,
385 .init_hwif = init_hwif_sl82c105,
386 .enablebits = {{0x40,0x01,0x01}, {0x40,0x10,0x10}},
387 .host_flags = IDE_HFLAG_IO_32BIT |
388 IDE_HFLAG_UNMASK_IRQS |
389 IDE_HFLAG_NO_AUTODMA |
391 .pio_mask = ATA_PIO5,
394 static int __devinit sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
396 return ide_setup_pci_device(dev, &sl82c105_chipset);
399 static const struct pci_device_id sl82c105_pci_tbl[] = {
400 { PCI_VDEVICE(WINBOND, PCI_DEVICE_ID_WINBOND_82C105), 0 },
403 MODULE_DEVICE_TABLE(pci, sl82c105_pci_tbl);
405 static struct pci_driver driver = {
406 .name = "W82C105_IDE",
407 .id_table = sl82c105_pci_tbl,
408 .probe = sl82c105_init_one,
411 static int __init sl82c105_ide_init(void)
413 return ide_pci_register_driver(&driver);
416 module_init(sl82c105_ide_init);
418 MODULE_DESCRIPTION("PCI driver module for W82C105 IDE");
419 MODULE_LICENSE("GPL");