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 struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
51 unsigned int cmd_on, cmd_off;
54 cmd_on = (t->active + 29) / 30;
55 cmd_off = (ide_pio_cycle_time(drive, pio) - 30 * cmd_on + 29) / 30;
63 if (pio > 2 || ide_dev_has_iordy(drive->id))
66 return (cmd_on - 1) << 8 | (cmd_off - 1) | iordy;
70 * Configure the chipset for PIO mode.
72 static void sl82c105_set_pio_mode(ide_drive_t *drive, const u8 pio)
74 struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
75 int reg = 0x44 + drive->dn * 4;
78 drv_ctrl = get_pio_timings(drive, pio);
81 * Store the PIO timings so that we can restore them
82 * in case DMA will be turned off...
84 drive->drive_data &= 0xffff0000;
85 drive->drive_data |= drv_ctrl;
87 pci_write_config_word(dev, reg, drv_ctrl);
88 pci_read_config_word (dev, reg, &drv_ctrl);
90 printk(KERN_DEBUG "%s: selected %s (%dns) (%04X)\n", drive->name,
91 ide_xfer_verbose(pio + XFER_PIO_0),
92 ide_pio_cycle_time(drive, pio), drv_ctrl);
96 * Configure the chipset for DMA mode.
98 static void sl82c105_set_dma_mode(ide_drive_t *drive, const u8 speed)
100 static u16 mwdma_timings[] = {0x0707, 0x0201, 0x0200};
103 DBG(("sl82c105_tune_chipset(drive:%s, speed:%s)\n",
104 drive->name, ide_xfer_verbose(speed)));
106 drv_ctrl = mwdma_timings[speed - XFER_MW_DMA_0];
109 * Store the DMA timings so that we can actually program
110 * them when DMA will be turned on...
112 drive->drive_data &= 0x0000ffff;
113 drive->drive_data |= (unsigned long)drv_ctrl << 16;
117 * The SL82C105 holds off all IDE interrupts while in DMA mode until
118 * all DMA activity is completed. Sometimes this causes problems (eg,
119 * when the drive wants to report an error condition).
121 * 0x7e is a "chip testing" register. Bit 2 resets the DMA controller
122 * state machine. We need to kick this to work around various bugs.
124 static inline void sl82c105_reset_host(struct pci_dev *dev)
128 pci_read_config_word(dev, 0x7e, &val);
129 pci_write_config_word(dev, 0x7e, val | (1 << 2));
130 pci_write_config_word(dev, 0x7e, val & ~(1 << 2));
134 * If we get an IRQ timeout, it might be that the DMA state machine
135 * got confused. Fix from Todd Inglett. Details from Winbond.
137 * This function is called when the IDE timer expires, the drive
138 * indicates that it is READY, and we were waiting for DMA to complete.
140 static void sl82c105_dma_lost_irq(ide_drive_t *drive)
142 ide_hwif_t *hwif = HWIF(drive);
143 struct pci_dev *dev = to_pci_dev(hwif->dev);
144 u32 val, mask = hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA;
147 printk("sl82c105: lost IRQ, resetting host\n");
150 * Check the raw interrupt from the drive.
152 pci_read_config_dword(dev, 0x40, &val);
154 printk("sl82c105: drive was requesting IRQ, but host lost it\n");
157 * Was DMA enabled? If so, disable it - we're resetting the
158 * host. The IDE layer will be handling the drive for us.
160 dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
162 outb(dma_cmd & ~1, hwif->dma_base + ATA_DMA_CMD);
163 printk("sl82c105: DMA was enabled\n");
166 sl82c105_reset_host(dev);
170 * ATAPI devices can cause the SL82C105 DMA state machine to go gaga.
171 * Winbond recommend that the DMA state machine is reset prior to
172 * setting the bus master DMA enable bit.
174 * The generic IDE core will have disabled the BMEN bit before this
175 * function is called.
177 static void sl82c105_dma_start(ide_drive_t *drive)
179 ide_hwif_t *hwif = HWIF(drive);
180 struct pci_dev *dev = to_pci_dev(hwif->dev);
181 int reg = 0x44 + drive->dn * 4;
183 DBG(("%s(drive:%s)\n", __func__, drive->name));
185 pci_write_config_word(dev, reg, drive->drive_data >> 16);
187 sl82c105_reset_host(dev);
188 ide_dma_start(drive);
191 static void sl82c105_dma_timeout(ide_drive_t *drive)
193 struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
195 DBG(("sl82c105_dma_timeout(drive:%s)\n", drive->name));
197 sl82c105_reset_host(dev);
198 ide_dma_timeout(drive);
201 static int sl82c105_dma_end(ide_drive_t *drive)
203 struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
204 int reg = 0x44 + drive->dn * 4;
207 DBG(("%s(drive:%s)\n", __func__, drive->name));
209 ret = __ide_dma_end(drive);
211 pci_write_config_word(dev, reg, drive->drive_data);
217 * ATA reset will clear the 16 bits mode in the control
218 * register, we need to reprogram it
220 static void sl82c105_resetproc(ide_drive_t *drive)
222 struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
225 DBG(("sl82c105_resetproc(drive:%s)\n", drive->name));
227 pci_read_config_dword(dev, 0x40, &val);
228 val |= (CTRL_P1F16 | CTRL_P0F16);
229 pci_write_config_dword(dev, 0x40, val);
233 * Return the revision of the Winbond bridge
234 * which this function is part of.
236 static u8 sl82c105_bridge_revision(struct pci_dev *dev)
238 struct pci_dev *bridge;
241 * The bridge should be part of the same device, but function 0.
243 bridge = pci_get_bus_and_slot(dev->bus->number,
244 PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
249 * Make sure it is a Winbond 553 and is an ISA bridge.
251 if (bridge->vendor != PCI_VENDOR_ID_WINBOND ||
252 bridge->device != PCI_DEVICE_ID_WINBOND_83C553 ||
253 bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) {
258 * We need to find function 0's revision, not function 1
262 return bridge->revision;
266 * Enable the PCI device
268 * --BenH: It's arch fixup code that should enable channels that
269 * have not been enabled by firmware. I decided we can still enable
270 * channel 0 here at least, but channel 1 has to be enabled by
271 * firmware or arch code. We still set both to 16 bits mode.
273 static unsigned int __devinit init_chipset_sl82c105(struct pci_dev *dev, const char *msg)
277 DBG(("init_chipset_sl82c105()\n"));
279 pci_read_config_dword(dev, 0x40, &val);
280 val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
281 pci_write_config_dword(dev, 0x40, val);
286 static const struct ide_port_ops sl82c105_port_ops = {
287 .set_pio_mode = sl82c105_set_pio_mode,
288 .set_dma_mode = sl82c105_set_dma_mode,
289 .resetproc = sl82c105_resetproc,
292 static const struct ide_dma_ops sl82c105_dma_ops = {
293 .dma_host_set = ide_dma_host_set,
294 .dma_setup = ide_dma_setup,
295 .dma_exec_cmd = ide_dma_exec_cmd,
296 .dma_start = sl82c105_dma_start,
297 .dma_end = sl82c105_dma_end,
298 .dma_test_irq = ide_dma_test_irq,
299 .dma_lost_irq = sl82c105_dma_lost_irq,
300 .dma_timeout = sl82c105_dma_timeout,
303 static const struct ide_port_info sl82c105_chipset __devinitdata = {
305 .init_chipset = init_chipset_sl82c105,
306 .enablebits = {{0x40,0x01,0x01}, {0x40,0x10,0x10}},
307 .port_ops = &sl82c105_port_ops,
308 .dma_ops = &sl82c105_dma_ops,
309 .host_flags = IDE_HFLAG_IO_32BIT |
310 IDE_HFLAG_UNMASK_IRQS |
311 /* FIXME: check for Compatibility mode in generic IDE PCI code */
312 #if defined(CONFIG_LOPEC) || defined(CONFIG_SANDPOINT)
313 IDE_HFLAG_FORCE_LEGACY_IRQS |
315 IDE_HFLAG_SERIALIZE_DMA |
316 IDE_HFLAG_NO_AUTODMA,
317 .pio_mask = ATA_PIO5,
318 .mwdma_mask = ATA_MWDMA2,
321 static int __devinit sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
323 struct ide_port_info d = sl82c105_chipset;
324 u8 rev = sl82c105_bridge_revision(dev);
328 * Never ever EVER under any circumstances enable
329 * DMA when the bridge is this old.
331 printk(KERN_INFO "W82C105_IDE: Winbond W83C553 bridge "
332 "revision %d, BM-DMA disabled\n", rev);
335 d.host_flags &= ~IDE_HFLAG_SERIALIZE_DMA;
338 return ide_pci_init_one(dev, &d, NULL);
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");