2 * linux/drivers/ide/pci/ns87415.c Version 2.00 Sep. 10, 2002
4 * Copyright (C) 1997-1998 Mark Lord <mlord@pobox.com>
5 * Copyright (C) 1998 Eddie C. Dost <ecd@skynet.be>
6 * Copyright (C) 1999-2000 Andre Hedrick <andre@linux-ide.org>
8 * Inspired by an earlier effort from David S. Miller <davem@redhat.com>
11 #include <linux/config.h>
12 #include <linux/module.h>
13 #include <linux/types.h>
14 #include <linux/kernel.h>
15 #include <linux/timer.h>
17 #include <linux/ioport.h>
18 #include <linux/interrupt.h>
19 #include <linux/blkdev.h>
20 #include <linux/hdreg.h>
21 #include <linux/pci.h>
22 #include <linux/delay.h>
23 #include <linux/ide.h>
24 #include <linux/init.h>
30 static unsigned int ns87415_count = 0, ns87415_control[MAX_HWIFS] = { 0 };
33 * This routine either enables/disables (according to drive->present)
34 * the IRQ associated with the port (HWIF(drive)),
35 * and selects either PIO or DMA handshaking for the next I/O operation.
37 static void ns87415_prepare_drive (ide_drive_t *drive, unsigned int use_dma)
39 ide_hwif_t *hwif = HWIF(drive);
40 unsigned int bit, other, new, *old = (unsigned int *) hwif->select_data;
41 struct pci_dev *dev = hwif->pci_dev;
44 local_irq_save(flags);
47 /* Adjust IRQ enable bit */
48 bit = 1 << (8 + hwif->channel);
49 new = drive->present ? (new & ~bit) : (new | bit);
51 /* Select PIO or DMA, DMA may only be selected for one drive/channel. */
52 bit = 1 << (20 + drive->select.b.unit + (hwif->channel << 1));
53 other = 1 << (20 + (1 - drive->select.b.unit) + (hwif->channel << 1));
54 new = use_dma ? ((new & ~other) | bit) : (new & ~bit);
60 * Don't change DMA engine settings while Write Buffers
63 (void) pci_read_config_byte(dev, 0x43, &stat);
66 (void) pci_read_config_byte(dev, 0x43, &stat);
70 (void) pci_write_config_dword(dev, 0x40, new);
73 * And let things settle...
78 local_irq_restore(flags);
81 static void ns87415_selectproc (ide_drive_t *drive)
83 ns87415_prepare_drive (drive, drive->using_dma);
86 static int ns87415_ide_dma_end (ide_drive_t *drive)
88 ide_hwif_t *hwif = HWIF(drive);
89 u8 dma_stat = 0, dma_cmd = 0;
91 drive->waiting_for_dma = 0;
92 dma_stat = hwif->INB(hwif->dma_status);
93 /* get dma command mode */
94 dma_cmd = hwif->INB(hwif->dma_command);
96 hwif->OUTB(dma_cmd & ~1, hwif->dma_command);
97 /* from ERRATA: clear the INTR & ERROR bits */
98 dma_cmd = hwif->INB(hwif->dma_command);
99 hwif->OUTB(dma_cmd|6, hwif->dma_command);
100 /* and free any DMA resources */
101 ide_destroy_dmatable(drive);
102 /* verify good DMA status */
103 return (dma_stat & 7) != 4;
106 static int ns87415_ide_dma_read (ide_drive_t *drive)
108 /* select DMA xfer */
109 ns87415_prepare_drive(drive, 1);
110 if (!(__ide_dma_read(drive)))
112 /* DMA failed: select PIO xfer */
113 ns87415_prepare_drive(drive, 0);
117 static int ns87415_ide_dma_write (ide_drive_t *drive)
119 /* select DMA xfer */
120 ns87415_prepare_drive(drive, 1);
121 if (!(__ide_dma_write(drive)))
123 /* DMA failed: select PIO xfer */
124 ns87415_prepare_drive(drive, 0);
128 static int ns87415_ide_dma_check (ide_drive_t *drive)
130 if (drive->media != ide_disk)
131 return HWIF(drive)->ide_dma_off_quietly(drive);
132 return __ide_dma_check(drive);
135 static void __init init_hwif_ns87415 (ide_hwif_t *hwif)
137 struct pci_dev *dev = hwif->pci_dev;
138 unsigned int ctrl, using_inta;
146 hwif->selectproc = &ns87415_selectproc;
148 /* Set a good latency timer and cache line size value. */
149 (void) pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
150 /* FIXME: use pci_set_master() to ensure good latency timer value */
153 * We cannot probe for IRQ: both ports share common IRQ on INTA.
154 * Also, leave IRQ masked during drive probing, to prevent infinite
155 * interrupts from a potentially floating INTA..
157 * IRQs get unmasked in selectproc when drive is first used.
159 (void) pci_read_config_dword(dev, 0x40, &ctrl);
160 (void) pci_read_config_byte(dev, 0x09, &progif);
161 /* is irq in "native" mode? */
162 using_inta = progif & (1 << (hwif->channel << 1));
164 using_inta = ctrl & (1 << (4 + hwif->channel));
166 hwif->select_data = hwif->mate->select_data;
168 hwif->select_data = (unsigned long)
169 &ns87415_control[ns87415_count++];
170 ctrl |= (1 << 8) | (1 << 9); /* mask both IRQs */
172 ctrl &= ~(1 << 6); /* unmask INTA */
173 *((unsigned int *)hwif->select_data) = ctrl;
174 (void) pci_write_config_dword(dev, 0x40, ctrl);
177 * Set prefetch size to 512 bytes for both ports,
178 * but don't turn on/off prefetching here.
180 pci_write_config_byte(dev, 0x55, 0xee);
184 * XXX: Reset the device, if we don't it will not respond
185 * to SELECT_DRIVE() properly during first probe_hwif().
188 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
190 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
193 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
196 } while ((stat & BUSY_STAT) && --timeout);
201 hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
202 else if (!hwif->irq && hwif->mate && hwif->mate->irq)
203 hwif->irq = hwif->mate->irq; /* share IRQ with mate */
208 hwif->OUTB(0x60, hwif->dma_status);
209 hwif->ide_dma_read = &ns87415_ide_dma_read;
210 hwif->ide_dma_write = &ns87415_ide_dma_write;
211 hwif->ide_dma_check = &ns87415_ide_dma_check;
212 hwif->ide_dma_end = &ns87415_ide_dma_end;
216 hwif->drives[0].autodma = hwif->autodma;
217 hwif->drives[1].autodma = hwif->autodma;
220 static int __devinit ns87415_init_one(struct pci_dev *dev, const struct pci_device_id *id)
222 ide_pci_device_t *d = &ns87415_chipsets[id->driver_data];
223 if (dev->device != d->device)
225 ide_setup_pci_device(dev, d);
229 static struct pci_device_id ns87415_pci_tbl[] = {
230 { PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87415, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
233 MODULE_DEVICE_TABLE(pci, ns87415_pci_tbl);
235 static struct pci_driver driver = {
236 .name = "NS87415IDE",
237 .id_table = ns87415_pci_tbl,
238 .probe = ns87415_init_one,
241 static int ns87415_ide_init(void)
243 return ide_pci_register_driver(&driver);
246 module_init(ns87415_ide_init);
248 MODULE_AUTHOR("Mark Lord, Eddie Dost, Andre Hedrick");
249 MODULE_DESCRIPTION("PCI driver module for NS87415 IDE");
250 MODULE_LICENSE("GPL");