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>
16 * Copyright (C) 2007 Bartlomiej Zolnierkiewicz
19 #include <linux/types.h>
20 #include <linux/module.h>
21 #include <linux/kernel.h>
22 #include <linux/timer.h>
24 #include <linux/ioport.h>
25 #include <linux/interrupt.h>
26 #include <linux/blkdev.h>
27 #include <linux/hdreg.h>
28 #include <linux/pci.h>
29 #include <linux/ide.h>
37 #define DBG(arg) printk arg
42 * SL82C105 PCI config register 0x40 bits.
44 #define CTRL_IDE_IRQB (1 << 30)
45 #define CTRL_IDE_IRQA (1 << 28)
46 #define CTRL_LEGIRQ (1 << 11)
47 #define CTRL_P1F16 (1 << 5)
48 #define CTRL_P1EN (1 << 4)
49 #define CTRL_P0F16 (1 << 1)
50 #define CTRL_P0EN (1 << 0)
53 * Convert a PIO mode and cycle time to the required on/off times
54 * for the interface. This has protection against runaway timings.
56 static unsigned int get_pio_timings(ide_drive_t *drive, u8 pio)
58 unsigned int cmd_on, cmd_off;
61 cmd_on = (ide_pio_timings[pio].active_time + 29) / 30;
62 cmd_off = (ide_pio_cycle_time(drive, pio) - 30 * cmd_on + 29) / 30;
70 if (pio > 2 || ide_dev_has_iordy(drive->id))
73 return (cmd_on - 1) << 8 | (cmd_off - 1) | iordy;
77 * Configure the chipset for PIO mode.
79 static void sl82c105_set_pio_mode(ide_drive_t *drive, const u8 pio)
81 struct pci_dev *dev = HWIF(drive)->pci_dev;
82 int reg = 0x44 + drive->dn * 4;
85 drv_ctrl = get_pio_timings(drive, pio);
88 * Store the PIO timings so that we can restore them
89 * in case DMA will be turned off...
91 drive->drive_data &= 0xffff0000;
92 drive->drive_data |= drv_ctrl;
94 pci_write_config_word(dev, reg, drv_ctrl);
95 pci_read_config_word (dev, reg, &drv_ctrl);
97 printk(KERN_DEBUG "%s: selected %s (%dns) (%04X)\n", drive->name,
98 ide_xfer_verbose(pio + XFER_PIO_0),
99 ide_pio_cycle_time(drive, pio), drv_ctrl);
103 * Configure the chipset for DMA mode.
105 static void sl82c105_set_dma_mode(ide_drive_t *drive, const u8 speed)
107 static u16 mwdma_timings[] = {0x0707, 0x0201, 0x0200};
110 DBG(("sl82c105_tune_chipset(drive:%s, speed:%s)\n",
111 drive->name, ide_xfer_verbose(speed)));
113 drv_ctrl = mwdma_timings[speed - XFER_MW_DMA_0];
116 * Store the DMA timings so that we can actually program
117 * them when DMA will be turned on...
119 drive->drive_data &= 0x0000ffff;
120 drive->drive_data |= (unsigned long)drv_ctrl << 16;
124 * The SL82C105 holds off all IDE interrupts while in DMA mode until
125 * all DMA activity is completed. Sometimes this causes problems (eg,
126 * when the drive wants to report an error condition).
128 * 0x7e is a "chip testing" register. Bit 2 resets the DMA controller
129 * state machine. We need to kick this to work around various bugs.
131 static inline void sl82c105_reset_host(struct pci_dev *dev)
135 pci_read_config_word(dev, 0x7e, &val);
136 pci_write_config_word(dev, 0x7e, val | (1 << 2));
137 pci_write_config_word(dev, 0x7e, val & ~(1 << 2));
141 * If we get an IRQ timeout, it might be that the DMA state machine
142 * got confused. Fix from Todd Inglett. Details from Winbond.
144 * This function is called when the IDE timer expires, the drive
145 * indicates that it is READY, and we were waiting for DMA to complete.
147 static void sl82c105_dma_lost_irq(ide_drive_t *drive)
149 ide_hwif_t *hwif = HWIF(drive);
150 struct pci_dev *dev = hwif->pci_dev;
151 u32 val, mask = hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA;
154 printk("sl82c105: lost IRQ, resetting host\n");
157 * Check the raw interrupt from the drive.
159 pci_read_config_dword(dev, 0x40, &val);
161 printk("sl82c105: drive was requesting IRQ, but host lost it\n");
164 * Was DMA enabled? If so, disable it - we're resetting the
165 * host. The IDE layer will be handling the drive for us.
167 dma_cmd = inb(hwif->dma_command);
169 outb(dma_cmd & ~1, hwif->dma_command);
170 printk("sl82c105: DMA was enabled\n");
173 sl82c105_reset_host(dev);
177 * ATAPI devices can cause the SL82C105 DMA state machine to go gaga.
178 * Winbond recommend that the DMA state machine is reset prior to
179 * setting the bus master DMA enable bit.
181 * The generic IDE core will have disabled the BMEN bit before this
182 * function is called.
184 static void sl82c105_dma_start(ide_drive_t *drive)
186 ide_hwif_t *hwif = HWIF(drive);
187 struct pci_dev *dev = hwif->pci_dev;
188 int reg = 0x44 + drive->dn * 4;
190 DBG(("%s(drive:%s)\n", __FUNCTION__, drive->name));
192 pci_write_config_word(dev, reg, drive->drive_data >> 16);
194 sl82c105_reset_host(dev);
195 ide_dma_start(drive);
198 static void sl82c105_dma_timeout(ide_drive_t *drive)
200 DBG(("sl82c105_dma_timeout(drive:%s)\n", drive->name));
202 sl82c105_reset_host(HWIF(drive)->pci_dev);
203 ide_dma_timeout(drive);
206 static int sl82c105_dma_end(ide_drive_t *drive)
208 struct pci_dev *dev = HWIF(drive)->pci_dev;
209 int reg = 0x44 + drive->dn * 4;
212 DBG(("%s(drive:%s)\n", __FUNCTION__, drive->name));
214 ret = __ide_dma_end(drive);
216 pci_write_config_word(dev, reg, drive->drive_data);
222 * ATA reset will clear the 16 bits mode in the control
223 * register, we need to reprogram it
225 static void sl82c105_resetproc(ide_drive_t *drive)
227 struct pci_dev *dev = HWIF(drive)->pci_dev;
230 DBG(("sl82c105_resetproc(drive:%s)\n", drive->name));
232 pci_read_config_dword(dev, 0x40, &val);
233 val |= (CTRL_P1F16 | CTRL_P0F16);
234 pci_write_config_dword(dev, 0x40, val);
238 * Return the revision of the Winbond bridge
239 * which this function is part of.
241 static unsigned int sl82c105_bridge_revision(struct pci_dev *dev)
243 struct pci_dev *bridge;
246 * The bridge should be part of the same device, but function 0.
248 bridge = pci_get_bus_and_slot(dev->bus->number,
249 PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
254 * Make sure it is a Winbond 553 and is an ISA bridge.
256 if (bridge->vendor != PCI_VENDOR_ID_WINBOND ||
257 bridge->device != PCI_DEVICE_ID_WINBOND_83C553 ||
258 bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) {
263 * We need to find function 0's revision, not function 1
267 return bridge->revision;
271 * Enable the PCI device
273 * --BenH: It's arch fixup code that should enable channels that
274 * have not been enabled by firmware. I decided we can still enable
275 * channel 0 here at least, but channel 1 has to be enabled by
276 * firmware or arch code. We still set both to 16 bits mode.
278 static unsigned int __devinit init_chipset_sl82c105(struct pci_dev *dev, const char *msg)
282 DBG(("init_chipset_sl82c105()\n"));
284 pci_read_config_dword(dev, 0x40, &val);
285 val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
286 pci_write_config_dword(dev, 0x40, val);
292 * Initialise IDE channel
294 static void __devinit init_hwif_sl82c105(ide_hwif_t *hwif)
298 DBG(("init_hwif_sl82c105(hwif: ide%d)\n", hwif->index));
300 hwif->set_pio_mode = &sl82c105_set_pio_mode;
301 hwif->set_dma_mode = &sl82c105_set_dma_mode;
302 hwif->resetproc = &sl82c105_resetproc;
307 rev = sl82c105_bridge_revision(hwif->pci_dev);
310 * Never ever EVER under any circumstances enable
311 * DMA when the bridge is this old.
313 printk(" %s: Winbond W83C553 bridge revision %d, "
314 "BM-DMA disabled\n", hwif->name, rev);
318 hwif->mwdma_mask = ATA_MWDMA2;
320 hwif->dma_lost_irq = &sl82c105_dma_lost_irq;
321 hwif->dma_start = &sl82c105_dma_start;
322 hwif->ide_dma_end = &sl82c105_dma_end;
323 hwif->dma_timeout = &sl82c105_dma_timeout;
326 hwif->serialized = hwif->mate->serialized = 1;
329 static const struct ide_port_info sl82c105_chipset __devinitdata = {
331 .init_chipset = init_chipset_sl82c105,
332 .init_hwif = init_hwif_sl82c105,
333 .enablebits = {{0x40,0x01,0x01}, {0x40,0x10,0x10}},
334 .host_flags = IDE_HFLAG_IO_32BIT |
335 IDE_HFLAG_UNMASK_IRQS |
336 IDE_HFLAG_NO_AUTODMA |
338 .pio_mask = ATA_PIO5,
341 static int __devinit sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
343 return ide_setup_pci_device(dev, &sl82c105_chipset);
346 static const struct pci_device_id sl82c105_pci_tbl[] = {
347 { PCI_VDEVICE(WINBOND, PCI_DEVICE_ID_WINBOND_82C105), 0 },
350 MODULE_DEVICE_TABLE(pci, sl82c105_pci_tbl);
352 static struct pci_driver driver = {
353 .name = "W82C105_IDE",
354 .id_table = sl82c105_pci_tbl,
355 .probe = sl82c105_init_one,
358 static int __init sl82c105_ide_init(void)
360 return ide_pci_register_driver(&driver);
363 module_init(sl82c105_ide_init);
365 MODULE_DESCRIPTION("PCI driver module for W82C105 IDE");
366 MODULE_LICENSE("GPL");