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>
28 static unsigned int ns87415_count = 0, ns87415_control[MAX_HWIFS] = { 0 };
31 * This routine either enables/disables (according to drive->present)
32 * the IRQ associated with the port (HWIF(drive)),
33 * and selects either PIO or DMA handshaking for the next I/O operation.
35 static void ns87415_prepare_drive (ide_drive_t *drive, unsigned int use_dma)
37 ide_hwif_t *hwif = HWIF(drive);
38 unsigned int bit, other, new, *old = (unsigned int *) hwif->select_data;
39 struct pci_dev *dev = hwif->pci_dev;
42 local_irq_save(flags);
45 /* Adjust IRQ enable bit */
46 bit = 1 << (8 + hwif->channel);
47 new = drive->present ? (new & ~bit) : (new | bit);
49 /* Select PIO or DMA, DMA may only be selected for one drive/channel. */
50 bit = 1 << (20 + drive->select.b.unit + (hwif->channel << 1));
51 other = 1 << (20 + (1 - drive->select.b.unit) + (hwif->channel << 1));
52 new = use_dma ? ((new & ~other) | bit) : (new & ~bit);
58 * Don't change DMA engine settings while Write Buffers
61 (void) pci_read_config_byte(dev, 0x43, &stat);
64 (void) pci_read_config_byte(dev, 0x43, &stat);
68 (void) pci_write_config_dword(dev, 0x40, new);
71 * And let things settle...
76 local_irq_restore(flags);
79 static void ns87415_selectproc (ide_drive_t *drive)
81 ns87415_prepare_drive (drive, drive->using_dma);
84 static int ns87415_ide_dma_end (ide_drive_t *drive)
86 ide_hwif_t *hwif = HWIF(drive);
87 u8 dma_stat = 0, dma_cmd = 0;
89 drive->waiting_for_dma = 0;
90 dma_stat = hwif->INB(hwif->dma_status);
91 /* get dma command mode */
92 dma_cmd = hwif->INB(hwif->dma_command);
94 hwif->OUTB(dma_cmd & ~1, hwif->dma_command);
95 /* from ERRATA: clear the INTR & ERROR bits */
96 dma_cmd = hwif->INB(hwif->dma_command);
97 hwif->OUTB(dma_cmd|6, hwif->dma_command);
98 /* and free any DMA resources */
99 ide_destroy_dmatable(drive);
100 /* verify good DMA status */
101 return (dma_stat & 7) != 4;
104 static int ns87415_ide_dma_read (ide_drive_t *drive)
106 /* select DMA xfer */
107 ns87415_prepare_drive(drive, 1);
108 if (!(__ide_dma_read(drive)))
110 /* DMA failed: select PIO xfer */
111 ns87415_prepare_drive(drive, 0);
115 static int ns87415_ide_dma_write (ide_drive_t *drive)
117 /* select DMA xfer */
118 ns87415_prepare_drive(drive, 1);
119 if (!(__ide_dma_write(drive)))
121 /* DMA failed: select PIO xfer */
122 ns87415_prepare_drive(drive, 0);
126 static int ns87415_ide_dma_check (ide_drive_t *drive)
128 if (drive->media != ide_disk)
129 return HWIF(drive)->ide_dma_off_quietly(drive);
130 return __ide_dma_check(drive);
133 static void __init init_hwif_ns87415 (ide_hwif_t *hwif)
135 struct pci_dev *dev = hwif->pci_dev;
136 unsigned int ctrl, using_inta;
144 hwif->selectproc = &ns87415_selectproc;
146 /* Set a good latency timer and cache line size value. */
147 (void) pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
148 /* FIXME: use pci_set_master() to ensure good latency timer value */
151 * We cannot probe for IRQ: both ports share common IRQ on INTA.
152 * Also, leave IRQ masked during drive probing, to prevent infinite
153 * interrupts from a potentially floating INTA..
155 * IRQs get unmasked in selectproc when drive is first used.
157 (void) pci_read_config_dword(dev, 0x40, &ctrl);
158 (void) pci_read_config_byte(dev, 0x09, &progif);
159 /* is irq in "native" mode? */
160 using_inta = progif & (1 << (hwif->channel << 1));
162 using_inta = ctrl & (1 << (4 + hwif->channel));
164 hwif->select_data = hwif->mate->select_data;
166 hwif->select_data = (unsigned long)
167 &ns87415_control[ns87415_count++];
168 ctrl |= (1 << 8) | (1 << 9); /* mask both IRQs */
170 ctrl &= ~(1 << 6); /* unmask INTA */
171 *((unsigned int *)hwif->select_data) = ctrl;
172 (void) pci_write_config_dword(dev, 0x40, ctrl);
175 * Set prefetch size to 512 bytes for both ports,
176 * but don't turn on/off prefetching here.
178 pci_write_config_byte(dev, 0x55, 0xee);
182 * XXX: Reset the device, if we don't it will not respond
183 * to SELECT_DRIVE() properly during first probe_hwif().
186 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
188 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
191 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
194 } while ((stat & BUSY_STAT) && --timeout);
199 hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
200 else if (!hwif->irq && hwif->mate && hwif->mate->irq)
201 hwif->irq = hwif->mate->irq; /* share IRQ with mate */
206 hwif->OUTB(0x60, hwif->dma_status);
207 hwif->ide_dma_read = &ns87415_ide_dma_read;
208 hwif->ide_dma_write = &ns87415_ide_dma_write;
209 hwif->ide_dma_check = &ns87415_ide_dma_check;
210 hwif->ide_dma_end = &ns87415_ide_dma_end;
214 hwif->drives[0].autodma = hwif->autodma;
215 hwif->drives[1].autodma = hwif->autodma;
218 static ide_pci_device_t ns87415_chipset __devinitdata = {
220 .init_hwif = init_hwif_ns87415,
223 .bootable = ON_BOARD,
226 static int __devinit ns87415_init_one(struct pci_dev *dev, const struct pci_device_id *id)
228 ide_setup_pci_device(dev, &ns87415_chipset);
232 static struct pci_device_id ns87415_pci_tbl[] = {
233 { PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87415, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
236 MODULE_DEVICE_TABLE(pci, ns87415_pci_tbl);
238 static struct pci_driver driver = {
239 .name = "NS87415_IDE",
240 .id_table = ns87415_pci_tbl,
241 .probe = ns87415_init_one,
244 static int ns87415_ide_init(void)
246 return ide_pci_register_driver(&driver);
249 module_init(ns87415_ide_init);
251 MODULE_AUTHOR("Mark Lord, Eddie Dost, Andre Hedrick");
252 MODULE_DESCRIPTION("PCI driver module for NS87415 IDE");
253 MODULE_LICENSE("GPL");