1 /*
2 * linux/drivers/ide/pci/ns87415.c Version 2.00 Sep. 10, 2002
3 *
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>
7 *
8 * Inspired by an earlier effort from David S. Miller <davem@redhat.com>
9 */
10
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>
16 #include <linux/mm.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>
25
26 #include <asm/io.h>
27
28 #include "ns87415.h"
29
30 static unsigned int ns87415_count = 0, ns87415_control[MAX_HWIFS] = { 0 };
31
32 /*
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.
36 */
ns87415_prepare_drive(ide_drive_t * drive,unsigned int use_dma)37 static void ns87415_prepare_drive (ide_drive_t *drive, unsigned int use_dma)
38 {
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;
42 unsigned long flags;
43
44 local_irq_save(flags);
45 new = *old;
46
47 /* Adjust IRQ enable bit */
48 bit = 1 << (8 + hwif->channel);
49 new = drive->present ? (new & ~bit) : (new | bit);
50
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);
55
56 if (new != *old) {
57 unsigned char stat;
58
59 /*
60 * Don't change DMA engine settings while Write Buffers
61 * are busy.
62 */
63 (void) pci_read_config_byte(dev, 0x43, &stat);
64 while (stat & 0x03) {
65 udelay(1);
66 (void) pci_read_config_byte(dev, 0x43, &stat);
67 }
68
69 *old = new;
70 (void) pci_write_config_dword(dev, 0x40, new);
71
72 /*
73 * And let things settle...
74 */
75 udelay(10);
76 }
77
78 local_irq_restore(flags);
79 }
80
ns87415_selectproc(ide_drive_t * drive)81 static void ns87415_selectproc (ide_drive_t *drive)
82 {
83 ns87415_prepare_drive (drive, drive->using_dma);
84 }
85
ns87415_ide_dma_end(ide_drive_t * drive)86 static int ns87415_ide_dma_end (ide_drive_t *drive)
87 {
88 ide_hwif_t *hwif = HWIF(drive);
89 u8 dma_stat = 0, dma_cmd = 0;
90
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);
95 /* stop DMA */
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;
104 }
105
ns87415_ide_dma_read(ide_drive_t * drive)106 static int ns87415_ide_dma_read (ide_drive_t *drive)
107 {
108 /* select DMA xfer */
109 ns87415_prepare_drive(drive, 1);
110 if (!(__ide_dma_read(drive)))
111 return 0;
112 /* DMA failed: select PIO xfer */
113 ns87415_prepare_drive(drive, 0);
114 return 1;
115 }
116
ns87415_ide_dma_write(ide_drive_t * drive)117 static int ns87415_ide_dma_write (ide_drive_t *drive)
118 {
119 /* select DMA xfer */
120 ns87415_prepare_drive(drive, 1);
121 if (!(__ide_dma_write(drive)))
122 return 0;
123 /* DMA failed: select PIO xfer */
124 ns87415_prepare_drive(drive, 0);
125 return 1;
126 }
127
ns87415_ide_dma_check(ide_drive_t * drive)128 static int ns87415_ide_dma_check (ide_drive_t *drive)
129 {
130 if (drive->media != ide_disk)
131 return HWIF(drive)->ide_dma_off_quietly(drive);
132 return __ide_dma_check(drive);
133 }
134
init_hwif_ns87415(ide_hwif_t * hwif)135 static void __init init_hwif_ns87415 (ide_hwif_t *hwif)
136 {
137 struct pci_dev *dev = hwif->pci_dev;
138 unsigned int ctrl, using_inta;
139 u8 progif;
140 #ifdef __sparc_v9__
141 int timeout;
142 u8 stat;
143 #endif
144
145 hwif->autodma = 0;
146 hwif->selectproc = &ns87415_selectproc;
147
148 /* Set a good latency timer and cache line size value. */
149 (void) pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
150 #ifdef __sparc_v9__
151 (void) pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 0x10);
152 #endif
153
154 /*
155 * We cannot probe for IRQ: both ports share common IRQ on INTA.
156 * Also, leave IRQ masked during drive probing, to prevent infinite
157 * interrupts from a potentially floating INTA..
158 *
159 * IRQs get unmasked in selectproc when drive is first used.
160 */
161 (void) pci_read_config_dword(dev, 0x40, &ctrl);
162 (void) pci_read_config_byte(dev, 0x09, &progif);
163 /* is irq in "native" mode? */
164 using_inta = progif & (1 << (hwif->channel << 1));
165 if (!using_inta)
166 using_inta = ctrl & (1 << (4 + hwif->channel));
167 if (hwif->mate) {
168 hwif->select_data = hwif->mate->select_data;
169 } else {
170 hwif->select_data = (unsigned long)
171 &ns87415_control[ns87415_count++];
172 ctrl |= (1 << 8) | (1 << 9); /* mask both IRQs */
173 if (using_inta)
174 ctrl &= ~(1 << 6); /* unmask INTA */
175 *((unsigned int *)hwif->select_data) = ctrl;
176 (void) pci_write_config_dword(dev, 0x40, ctrl);
177
178 /*
179 * Set prefetch size to 512 bytes for both ports,
180 * but don't turn on/off prefetching here.
181 */
182 pci_write_config_byte(dev, 0x55, 0xee);
183
184 #ifdef __sparc_v9__
185 /*
186 * XXX: Reset the device, if we don't it will not respond
187 * to SELECT_DRIVE() properly during first probe_hwif().
188 */
189 timeout = 10000;
190 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
191 udelay(10);
192 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
193 do {
194 udelay(50);
195 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
196 if (stat == 0xff)
197 break;
198 } while ((stat & BUSY_STAT) && --timeout);
199 #endif
200 }
201
202 if (!using_inta)
203 hwif->irq = hwif->channel ? 15 : 14; /* legacy mode */
204 else if (!hwif->irq && hwif->mate && hwif->mate->irq)
205 hwif->irq = hwif->mate->irq; /* share IRQ with mate */
206
207 if (!hwif->dma_base)
208 return;
209
210 hwif->OUTB(0x60, hwif->dma_status);
211 hwif->ide_dma_read = &ns87415_ide_dma_read;
212 hwif->ide_dma_write = &ns87415_ide_dma_write;
213 hwif->ide_dma_check = &ns87415_ide_dma_check;
214 hwif->ide_dma_end = &ns87415_ide_dma_end;
215
216 if (!noautodma)
217 hwif->autodma = 1;
218 hwif->drives[0].autodma = hwif->autodma;
219 hwif->drives[1].autodma = hwif->autodma;
220 }
221
init_dma_ns87415(ide_hwif_t * hwif,unsigned long dmabase)222 static void __init init_dma_ns87415 (ide_hwif_t *hwif, unsigned long dmabase)
223 {
224 ide_setup_dma(hwif, dmabase, 8);
225 }
226
227 extern void ide_setup_pci_device(struct pci_dev *, ide_pci_device_t *);
228
ns87415_init_one(struct pci_dev * dev,const struct pci_device_id * id)229 static int __devinit ns87415_init_one(struct pci_dev *dev, const struct pci_device_id *id)
230 {
231 ide_pci_device_t *d = &ns87415_chipsets[id->driver_data];
232 if (dev->device != d->device)
233 BUG();
234 ide_setup_pci_device(dev, d);
235 MOD_INC_USE_COUNT;
236 return 0;
237 }
238
239 static struct pci_device_id ns87415_pci_tbl[] __devinitdata = {
240 { PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87415, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
241 { 0, },
242 };
243
244 static struct pci_driver driver = {
245 .name = "NS87415IDE",
246 .id_table = ns87415_pci_tbl,
247 .probe = ns87415_init_one,
248 };
249
ns87415_ide_init(void)250 static int ns87415_ide_init(void)
251 {
252 return ide_pci_register_driver(&driver);
253 }
254
ns87415_ide_exit(void)255 static void ns87415_ide_exit(void)
256 {
257 ide_pci_unregister_driver(&driver);
258 }
259
260 module_init(ns87415_ide_init);
261 module_exit(ns87415_ide_exit);
262
263 MODULE_AUTHOR("Mark Lord, Eddie Dost, Andre Hedrick");
264 MODULE_DESCRIPTION("PCI driver module for NS87415 IDE");
265 MODULE_LICENSE("GPL");
266
267 EXPORT_NO_SYMBOLS;
268