File: /usr/src/linux/drivers/ide/sl82c105.c
1 /*
2 * linux/drivers/ide/sl82c105.c
3 *
4 * SL82C105/Winbond 553 IDE driver
5 *
6 * Maintainer unknown.
7 *
8 * Drive tuning added from Rebel.com's kernel sources
9 * -- Russell King (15/11/98) linux@arm.linux.org.uk
10 */
11
12 #include <linux/config.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/ide.h>
23
24 #include <asm/io.h>
25 #include <asm/dma.h>
26
27 #include "ide_modes.h"
28
29 extern char *ide_xfer_verbose (byte xfer_rate);
30
31 /*
32 * Convert a PIO mode and cycle time to the required on/off
33 * times for the interface. This has protection against run-away
34 * timings.
35 */
36 static unsigned int get_timing_sl82c105(ide_pio_data_t *p)
37 {
38 unsigned int cmd_on;
39 unsigned int cmd_off;
40
41 cmd_on = (ide_pio_timings[p->pio_mode].active_time + 29) / 30;
42 cmd_off = (p->cycle_time - 30 * cmd_on + 29) / 30;
43
44 if (cmd_on > 32)
45 cmd_on = 32;
46 if (cmd_on == 0)
47 cmd_on = 1;
48
49 if (cmd_off > 32)
50 cmd_off = 32;
51 if (cmd_off == 0)
52 cmd_off = 1;
53
54 return (cmd_on - 1) << 8 | (cmd_off - 1) | (p->use_iordy ? 0x40 : 0x00);
55 }
56
57 /*
58 * Configure the drive and chipset for PIO
59 */
60 static void config_for_pio(ide_drive_t *drive, int pio, int report)
61 {
62 ide_hwif_t *hwif = HWIF(drive);
63 struct pci_dev *dev = hwif->pci_dev;
64 ide_pio_data_t p;
65 unsigned short drv_ctrl = 0x909;
66 unsigned int xfer_mode, reg;
67
68 reg = (hwif->channel ? 0x4c : 0x44) + (drive->select.b.unit ? 4 : 0);
69
70 pio = ide_get_best_pio_mode(drive, pio, 5, &p);
71
72 switch (pio) {
73 default:
74 case 0: xfer_mode = XFER_PIO_0; break;
75 case 1: xfer_mode = XFER_PIO_1; break;
76 case 2: xfer_mode = XFER_PIO_2; break;
77 case 3: xfer_mode = XFER_PIO_3; break;
78 case 4: xfer_mode = XFER_PIO_4; break;
79 }
80
81 if (ide_config_drive_speed(drive, xfer_mode) == 0)
82 drv_ctrl = get_timing_sl82c105(&p);
83
84 if (drive->using_dma == 0) {
85 /*
86 * If we are actually using MW DMA, then we can not
87 * reprogram the interface drive control register.
88 */
89 pci_write_config_word(dev, reg, drv_ctrl);
90 pci_read_config_word(dev, reg, &drv_ctrl);
91
92 if (report) {
93 printk("%s: selected %s (%dns) (%04X)\n", drive->name,
94 ide_xfer_verbose(xfer_mode), p.cycle_time, drv_ctrl);
95 }
96 }
97 }
98
99 /*
100 * Configure the drive and the chipset for DMA
101 */
102 static int config_for_dma(ide_drive_t *drive)
103 {
104 ide_hwif_t *hwif = HWIF(drive);
105 struct pci_dev *dev = hwif->pci_dev;
106 unsigned short drv_ctrl = 0x909;
107 unsigned int reg;
108
109 reg = (hwif->channel ? 0x4c : 0x44) + (drive->select.b.unit ? 4 : 0);
110
111 if (ide_config_drive_speed(drive, XFER_MW_DMA_2) == 0)
112 drv_ctrl = 0x0240;
113
114 pci_write_config_word(dev, reg, drv_ctrl);
115
116 return 0;
117 }
118
119 /*
120 * Check to see if the drive and
121 * chipset is capable of DMA mode
122 */
123 static int sl82c105_check_drive(ide_drive_t *drive)
124 {
125 ide_dma_action_t dma_func = ide_dma_off_quietly;
126
127 do {
128 struct hd_driveid *id = drive->id;
129 ide_hwif_t *hwif = HWIF(drive);
130
131 if (!hwif->autodma)
132 break;
133
134 if (!id || !(id->capability & 1))
135 break;
136
137 /* Consult the list of known "bad" drives */
138 if (ide_dmaproc(ide_dma_bad_drive, drive)) {
139 dma_func = ide_dma_off;
140 break;
141 }
142
143 if (id->field_valid & 2) {
144 if (id->dma_mword & 7 || id->dma_1word & 7)
145 dma_func = ide_dma_on;
146 break;
147 }
148
149 if (ide_dmaproc(ide_dma_good_drive, drive)) {
150 dma_func = ide_dma_on;
151 break;
152 }
153 } while (0);
154
155 return HWIF(drive)->dmaproc(dma_func, drive);
156 }
157
158 /*
159 * Our own dmaproc, only to intercept ide_dma_check
160 */
161 static int sl82c105_dmaproc(ide_dma_action_t func, ide_drive_t *drive)
162 {
163 switch (func) {
164 case ide_dma_check:
165 return sl82c105_check_drive(drive);
166 case ide_dma_on:
167 if (config_for_dma(drive))
168 func = ide_dma_off;
169 /* fall through */
170 case ide_dma_off_quietly:
171 case ide_dma_off:
172 config_for_pio(drive, 4, 0);
173 break;
174 default:
175 break;
176 }
177 return ide_dmaproc(func, drive);
178 }
179
180 /*
181 * We only deal with PIO mode here - DMA mode 'using_dma' is not
182 * initialised at the point that this function is called.
183 */
184 static void tune_sl82c105(ide_drive_t *drive, byte pio)
185 {
186 config_for_pio(drive, pio, 1);
187
188 /*
189 * We support 32-bit I/O on this interface, and it
190 * doesn't have problems with interrupts.
191 */
192 drive->io_32bit = 1;
193 drive->unmask = 1;
194 }
195
196 /*
197 * Return the revision of the Winbond bridge
198 * which this function is part of.
199 */
200 static unsigned int sl82c105_bridge_revision(struct pci_dev *dev)
201 {
202 struct pci_dev *bridge;
203 unsigned char rev;
204
205 bridge = pci_find_device(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_83C553, NULL);
206
207 /*
208 * If we are part of a Winbond 553
209 */
210 if (!bridge || bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA)
211 return -1;
212
213 if (bridge->bus != dev->bus ||
214 PCI_SLOT(bridge->devfn) != PCI_SLOT(dev->devfn))
215 return -1;
216
217 /*
218 * We need to find function 0's revision, not function 1
219 */
220 pci_read_config_byte(bridge, PCI_REVISION_ID, &rev);
221
222 return rev;
223 }
224
225 /*
226 * Enable the PCI device
227 */
228 unsigned int __init pci_init_sl82c105(struct pci_dev *dev, const char *msg)
229 {
230 unsigned char ctrl_stat;
231
232 /*
233 * Enable the ports
234 */
235 pci_read_config_byte(dev, 0x40, &ctrl_stat);
236 pci_write_config_byte(dev, 0x40, ctrl_stat | 0x33);
237
238 return dev->irq;
239 }
240
241 void __init dma_init_sl82c105(ide_hwif_t *hwif, unsigned long dma_base)
242 {
243 unsigned int rev;
244 byte dma_state;
245
246 dma_state = inb(dma_base + 2);
247 rev = sl82c105_bridge_revision(hwif->pci_dev);
248 if (rev <= 5) {
249 hwif->autodma = 0;
250 hwif->drives[0].autotune = 1;
251 hwif->drives[1].autotune = 1;
252 printk(" %s: Winbond 553 bridge revision %d, BM-DMA disabled\n",
253 hwif->name, rev);
254 dma_state &= ~0x60;
255 } else {
256 dma_state |= 0x60;
257 hwif->autodma = 1;
258 }
259 outb(dma_state, dma_base + 2);
260
261 hwif->dmaproc = NULL;
262 ide_setup_dma(hwif, dma_base, 8);
263 if (hwif->dmaproc)
264 hwif->dmaproc = sl82c105_dmaproc;
265 }
266
267 /*
268 * Initialise the chip
269 */
270 void __init ide_init_sl82c105(ide_hwif_t *hwif)
271 {
272 hwif->tuneproc = tune_sl82c105;
273 }
274
275