1 // SPDX-License-Identifier: GPL-2.0-only
3 * SL82C105/Winbond 553 IDE driver
7 * Drive tuning added from Rebel.com's kernel sources
8 * -- Russell King (15/11/98) linux@arm.linux.org.uk
10 * Merge in Russell's HW workarounds, fix various problems
11 * with the timing registers setup.
12 * -- Benjamin Herrenschmidt (01/11/03) benh@kernel.crashing.org
14 * Copyright (C) 2006-2007,2009 MontaVista Software, Inc. <source@mvista.com>
15 * Copyright (C) 2007 Bartlomiej Zolnierkiewicz
18 #include <linux/types.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/pci.h>
22 #include <linux/ide.h>
26 #define DRV_NAME "sl82c105"
29 * SL82C105 PCI config register 0x40 bits.
31 #define CTRL_IDE_IRQB (1 << 30)
32 #define CTRL_IDE_IRQA (1 << 28)
33 #define CTRL_LEGIRQ (1 << 11)
34 #define CTRL_P1F16 (1 << 5)
35 #define CTRL_P1EN (1 << 4)
36 #define CTRL_P0F16 (1 << 1)
37 #define CTRL_P0EN (1 << 0)
40 * Convert a PIO mode and cycle time to the required on/off times
41 * for the interface. This has protection against runaway timings.
43 static unsigned int get_pio_timings(ide_drive_t *drive, u8 pio)
45 struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
46 unsigned int cmd_on, cmd_off;
49 cmd_on = (t->active + 29) / 30;
50 cmd_off = (ide_pio_cycle_time(drive, pio) - 30 * cmd_on + 29) / 30;
58 if (ide_pio_need_iordy(drive, pio))
61 return (cmd_on - 1) << 8 | (cmd_off - 1) | iordy;
65 * Configure the chipset for PIO mode.
67 static void sl82c105_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
69 struct pci_dev *dev = to_pci_dev(hwif->dev);
70 unsigned long timings = (unsigned long)ide_get_drivedata(drive);
71 int reg = 0x44 + drive->dn * 4;
73 const u8 pio = drive->pio_mode - XFER_PIO_0;
75 drv_ctrl = get_pio_timings(drive, pio);
78 * Store the PIO timings so that we can restore them
79 * in case DMA will be turned off...
81 timings &= 0xffff0000;
83 ide_set_drivedata(drive, (void *)timings);
85 pci_write_config_word(dev, reg, drv_ctrl);
86 pci_read_config_word (dev, reg, &drv_ctrl);
88 printk(KERN_DEBUG "%s: selected %s (%dns) (%04X)\n", drive->name,
89 ide_xfer_verbose(pio + XFER_PIO_0),
90 ide_pio_cycle_time(drive, pio), drv_ctrl);
94 * Configure the chipset for DMA mode.
96 static void sl82c105_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
98 static u16 mwdma_timings[] = {0x0707, 0x0201, 0x0200};
99 unsigned long timings = (unsigned long)ide_get_drivedata(drive);
101 const u8 speed = drive->dma_mode;
103 drv_ctrl = mwdma_timings[speed - XFER_MW_DMA_0];
106 * Store the DMA timings so that we can actually program
107 * them when DMA will be turned on...
109 timings &= 0x0000ffff;
110 timings |= (unsigned long)drv_ctrl << 16;
111 ide_set_drivedata(drive, (void *)timings);
114 static int sl82c105_test_irq(ide_hwif_t *hwif)
116 struct pci_dev *dev = to_pci_dev(hwif->dev);
117 u32 val, mask = hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA;
119 pci_read_config_dword(dev, 0x40, &val);
121 return (val & mask) ? 1 : 0;
125 * The SL82C105 holds off all IDE interrupts while in DMA mode until
126 * all DMA activity is completed. Sometimes this causes problems (eg,
127 * when the drive wants to report an error condition).
129 * 0x7e is a "chip testing" register. Bit 2 resets the DMA controller
130 * state machine. We need to kick this to work around various bugs.
132 static inline void sl82c105_reset_host(struct pci_dev *dev)
136 pci_read_config_word(dev, 0x7e, &val);
137 pci_write_config_word(dev, 0x7e, val | (1 << 2));
138 pci_write_config_word(dev, 0x7e, val & ~(1 << 2));
142 * If we get an IRQ timeout, it might be that the DMA state machine
143 * got confused. Fix from Todd Inglett. Details from Winbond.
145 * This function is called when the IDE timer expires, the drive
146 * indicates that it is READY, and we were waiting for DMA to complete.
148 static void sl82c105_dma_lost_irq(ide_drive_t *drive)
150 ide_hwif_t *hwif = drive->hwif;
151 struct pci_dev *dev = to_pci_dev(hwif->dev);
152 u32 val, mask = hwif->channel ? CTRL_IDE_IRQB : CTRL_IDE_IRQA;
155 printk(KERN_WARNING "sl82c105: lost IRQ, resetting host\n");
158 * Check the raw interrupt from the drive.
160 pci_read_config_dword(dev, 0x40, &val);
162 printk(KERN_INFO "sl82c105: drive was requesting IRQ, "
163 "but host lost it\n");
166 * Was DMA enabled? If so, disable it - we're resetting the
167 * host. The IDE layer will be handling the drive for us.
169 dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
171 outb(dma_cmd & ~1, hwif->dma_base + ATA_DMA_CMD);
172 printk(KERN_INFO "sl82c105: DMA was enabled\n");
175 sl82c105_reset_host(dev);
179 * ATAPI devices can cause the SL82C105 DMA state machine to go gaga.
180 * Winbond recommend that the DMA state machine is reset prior to
181 * setting the bus master DMA enable bit.
183 * The generic IDE core will have disabled the BMEN bit before this
184 * function is called.
186 static void sl82c105_dma_start(ide_drive_t *drive)
188 ide_hwif_t *hwif = drive->hwif;
189 struct pci_dev *dev = to_pci_dev(hwif->dev);
190 int reg = 0x44 + drive->dn * 4;
192 pci_write_config_word(dev, reg,
193 (unsigned long)ide_get_drivedata(drive) >> 16);
195 sl82c105_reset_host(dev);
196 ide_dma_start(drive);
199 static void sl82c105_dma_clear(ide_drive_t *drive)
201 struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
203 sl82c105_reset_host(dev);
206 static int sl82c105_dma_end(ide_drive_t *drive)
208 struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
209 int reg = 0x44 + drive->dn * 4;
210 int ret = ide_dma_end(drive);
212 pci_write_config_word(dev, reg,
213 (unsigned long)ide_get_drivedata(drive));
219 * ATA reset will clear the 16 bits mode in the control
220 * register, we need to reprogram it
222 static void sl82c105_resetproc(ide_drive_t *drive)
224 struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
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_domain_bus_and_slot(pci_domain_nr(dev->bus),
245 PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
250 * Make sure it is a Winbond 553 and is an ISA bridge.
252 if (bridge->vendor != PCI_VENDOR_ID_WINBOND ||
253 bridge->device != PCI_DEVICE_ID_WINBOND_83C553 ||
254 bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) {
259 * We need to find function 0's revision, not function 1
263 return bridge->revision;
267 * Enable the PCI device
269 * --BenH: It's arch fixup code that should enable channels that
270 * have not been enabled by firmware. I decided we can still enable
271 * channel 0 here at least, but channel 1 has to be enabled by
272 * firmware or arch code. We still set both to 16 bits mode.
274 static int init_chipset_sl82c105(struct pci_dev *dev)
278 pci_read_config_dword(dev, 0x40, &val);
279 val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
280 pci_write_config_dword(dev, 0x40, val);
285 static const struct ide_port_ops sl82c105_port_ops = {
286 .set_pio_mode = sl82c105_set_pio_mode,
287 .set_dma_mode = sl82c105_set_dma_mode,
288 .resetproc = sl82c105_resetproc,
289 .test_irq = sl82c105_test_irq,
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_start = sl82c105_dma_start,
296 .dma_end = sl82c105_dma_end,
297 .dma_test_irq = ide_dma_test_irq,
298 .dma_lost_irq = sl82c105_dma_lost_irq,
299 .dma_timer_expiry = ide_dma_sff_timer_expiry,
300 .dma_clear = sl82c105_dma_clear,
301 .dma_sff_read_status = ide_dma_sff_read_status,
304 static const struct ide_port_info sl82c105_chipset = {
306 .init_chipset = init_chipset_sl82c105,
307 .enablebits = {{0x40,0x01,0x01}, {0x40,0x10,0x10}},
308 .port_ops = &sl82c105_port_ops,
309 .dma_ops = &sl82c105_dma_ops,
310 .host_flags = IDE_HFLAG_IO_32BIT |
311 IDE_HFLAG_UNMASK_IRQS |
312 IDE_HFLAG_SERIALIZE_DMA |
313 IDE_HFLAG_NO_AUTODMA,
314 .pio_mask = ATA_PIO5,
315 .mwdma_mask = ATA_MWDMA2,
318 static int sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
320 struct ide_port_info d = sl82c105_chipset;
321 u8 rev = sl82c105_bridge_revision(dev);
325 * Never ever EVER under any circumstances enable
326 * DMA when the bridge is this old.
328 printk(KERN_INFO DRV_NAME ": Winbond W83C553 bridge "
329 "revision %d, BM-DMA disabled\n", rev);
332 d.host_flags &= ~IDE_HFLAG_SERIALIZE_DMA;
335 return ide_pci_init_one(dev, &d, NULL);
338 static const struct pci_device_id sl82c105_pci_tbl[] = {
339 { PCI_VDEVICE(WINBOND, PCI_DEVICE_ID_WINBOND_82C105), 0 },
342 MODULE_DEVICE_TABLE(pci, sl82c105_pci_tbl);
344 static struct pci_driver sl82c105_pci_driver = {
345 .name = "W82C105_IDE",
346 .id_table = sl82c105_pci_tbl,
347 .probe = sl82c105_init_one,
348 .remove = ide_pci_remove,
349 .suspend = ide_pci_suspend,
350 .resume = ide_pci_resume,
353 static int __init sl82c105_ide_init(void)
355 return ide_pci_register_driver(&sl82c105_pci_driver);
358 static void __exit sl82c105_ide_exit(void)
360 pci_unregister_driver(&sl82c105_pci_driver);
363 module_init(sl82c105_ide_init);
364 module_exit(sl82c105_ide_exit);
366 MODULE_DESCRIPTION("PCI driver module for W82C105 IDE");
367 MODULE_LICENSE("GPL");