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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * cmd64x.c: Enable interrupts at initialization time on Ultra/PCI machines.
4 * Due to massive hardware bugs, UltraDMA is only supported
5 * on the 646U2 and not on the 646U.
6 *
7 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
8 * Copyright (C) 1998 David S. Miller (davem@redhat.com)
9 *
10 * Copyright (C) 1999-2002 Andre Hedrick <andre@linux-ide.org>
11 * Copyright (C) 2007-2010 Bartlomiej Zolnierkiewicz
12 * Copyright (C) 2007,2009 MontaVista Software, Inc. <source@mvista.com>
13 */
14
15#include <linux/module.h>
16#include <linux/types.h>
17#include <linux/pci.h>
18#include <linux/ide.h>
19#include <linux/init.h>
20
21#include <asm/io.h>
22
23#define DRV_NAME "cmd64x"
24
25/*
26 * CMD64x specific registers definition.
27 */
28#define CFR 0x50
29#define CFR_INTR_CH0 0x04
30
31#define CMDTIM 0x52
32#define ARTTIM0 0x53
33#define DRWTIM0 0x54
34#define ARTTIM1 0x55
35#define DRWTIM1 0x56
36#define ARTTIM23 0x57
37#define ARTTIM23_DIS_RA2 0x04
38#define ARTTIM23_DIS_RA3 0x08
39#define ARTTIM23_INTR_CH1 0x10
40#define DRWTIM2 0x58
41#define BRST 0x59
42#define DRWTIM3 0x5b
43
44#define BMIDECR0 0x70
45#define MRDMODE 0x71
46#define MRDMODE_INTR_CH0 0x04
47#define MRDMODE_INTR_CH1 0x08
48#define UDIDETCR0 0x73
49#define DTPR0 0x74
50#define BMIDECR1 0x78
51#define BMIDECSR 0x79
52#define UDIDETCR1 0x7B
53#define DTPR1 0x7C
54
55static void cmd64x_program_timings(ide_drive_t *drive, u8 mode)
56{
57 ide_hwif_t *hwif = drive->hwif;
58 struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
59 int bus_speed = ide_pci_clk ? ide_pci_clk : 33;
60 const unsigned long T = 1000000 / bus_speed;
61 static const u8 recovery_values[] =
62 {15, 15, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 0};
63 static const u8 setup_values[] = {0x40, 0x40, 0x40, 0x80, 0, 0xc0};
64 static const u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};
65 static const u8 drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM2, DRWTIM3};
66 struct ide_timing t;
67 u8 arttim = 0;
68
69 if (drive->dn >= ARRAY_SIZE(drwtim_regs))
70 return;
71
72 ide_timing_compute(drive, mode, &t, T, 0);
73
74 /*
75 * In case we've got too long recovery phase, try to lengthen
76 * the active phase
77 */
78 if (t.recover > 16) {
79 t.active += t.recover - 16;
80 t.recover = 16;
81 }
82 if (t.active > 16) /* shouldn't actually happen... */
83 t.active = 16;
84
85 /*
86 * Convert values to internal chipset representation
87 */
88 t.recover = recovery_values[t.recover];
89 t.active &= 0x0f;
90
91 /* Program the active/recovery counts into the DRWTIM register */
92 pci_write_config_byte(dev, drwtim_regs[drive->dn],
93 (t.active << 4) | t.recover);
94
95 /*
96 * The primary channel has individual address setup timing registers
97 * for each drive and the hardware selects the slowest timing itself.
98 * The secondary channel has one common register and we have to select
99 * the slowest address setup timing ourselves.
100 */
101 if (hwif->channel) {
102 ide_drive_t *pair = ide_get_pair_dev(drive);
103
104 if (pair) {
105 struct ide_timing tp;
106
107 ide_timing_compute(pair, pair->pio_mode, &tp, T, 0);
108 ide_timing_merge(&t, &tp, &t, IDE_TIMING_SETUP);
109 if (pair->dma_mode) {
110 ide_timing_compute(pair, pair->dma_mode,
111 &tp, T, 0);
112 ide_timing_merge(&tp, &t, &t, IDE_TIMING_SETUP);
113 }
114 }
115 }
116
117 if (t.setup > 5) /* shouldn't actually happen... */
118 t.setup = 5;
119
120 /*
121 * Program the address setup clocks into the ARTTIM registers.
122 * Avoid clearing the secondary channel's interrupt bit.
123 */
124 (void) pci_read_config_byte (dev, arttim_regs[drive->dn], &arttim);
125 if (hwif->channel)
126 arttim &= ~ARTTIM23_INTR_CH1;
127 arttim &= ~0xc0;
128 arttim |= setup_values[t.setup];
129 (void) pci_write_config_byte(dev, arttim_regs[drive->dn], arttim);
130}
131
132/*
133 * Attempts to set drive's PIO mode.
134 * Special cases are 8: prefetch off, 9: prefetch on (both never worked)
135 */
136
137static void cmd64x_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
138{
139 const u8 pio = drive->pio_mode - XFER_PIO_0;
140
141 /*
142 * Filter out the prefetch control values
143 * to prevent PIO5 from being programmed
144 */
145 if (pio == 8 || pio == 9)
146 return;
147
148 cmd64x_program_timings(drive, XFER_PIO_0 + pio);
149}
150
151static void cmd64x_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
152{
153 struct pci_dev *dev = to_pci_dev(hwif->dev);
154 u8 unit = drive->dn & 0x01;
155 u8 regU = 0, pciU = hwif->channel ? UDIDETCR1 : UDIDETCR0;
156 const u8 speed = drive->dma_mode;
157
158 pci_read_config_byte(dev, pciU, ®U);
159 regU &= ~(unit ? 0xCA : 0x35);
160
161 switch(speed) {
162 case XFER_UDMA_5:
163 regU |= unit ? 0x0A : 0x05;
164 break;
165 case XFER_UDMA_4:
166 regU |= unit ? 0x4A : 0x15;
167 break;
168 case XFER_UDMA_3:
169 regU |= unit ? 0x8A : 0x25;
170 break;
171 case XFER_UDMA_2:
172 regU |= unit ? 0x42 : 0x11;
173 break;
174 case XFER_UDMA_1:
175 regU |= unit ? 0x82 : 0x21;
176 break;
177 case XFER_UDMA_0:
178 regU |= unit ? 0xC2 : 0x31;
179 break;
180 case XFER_MW_DMA_2:
181 case XFER_MW_DMA_1:
182 case XFER_MW_DMA_0:
183 cmd64x_program_timings(drive, speed);
184 break;
185 }
186
187 pci_write_config_byte(dev, pciU, regU);
188}
189
190static void cmd648_clear_irq(ide_drive_t *drive)
191{
192 ide_hwif_t *hwif = drive->hwif;
193 struct pci_dev *dev = to_pci_dev(hwif->dev);
194 unsigned long base = pci_resource_start(dev, 4);
195 u8 irq_mask = hwif->channel ? MRDMODE_INTR_CH1 :
196 MRDMODE_INTR_CH0;
197 u8 mrdmode = inb(base + 1);
198
199 /* clear the interrupt bit */
200 outb((mrdmode & ~(MRDMODE_INTR_CH0 | MRDMODE_INTR_CH1)) | irq_mask,
201 base + 1);
202}
203
204static void cmd64x_clear_irq(ide_drive_t *drive)
205{
206 ide_hwif_t *hwif = drive->hwif;
207 struct pci_dev *dev = to_pci_dev(hwif->dev);
208 int irq_reg = hwif->channel ? ARTTIM23 : CFR;
209 u8 irq_mask = hwif->channel ? ARTTIM23_INTR_CH1 :
210 CFR_INTR_CH0;
211 u8 irq_stat = 0;
212
213 (void) pci_read_config_byte(dev, irq_reg, &irq_stat);
214 /* clear the interrupt bit */
215 (void) pci_write_config_byte(dev, irq_reg, irq_stat | irq_mask);
216}
217
218static int cmd648_test_irq(ide_hwif_t *hwif)
219{
220 struct pci_dev *dev = to_pci_dev(hwif->dev);
221 unsigned long base = pci_resource_start(dev, 4);
222 u8 irq_mask = hwif->channel ? MRDMODE_INTR_CH1 :
223 MRDMODE_INTR_CH0;
224 u8 mrdmode = inb(base + 1);
225
226 pr_debug("%s: mrdmode: 0x%02x irq_mask: 0x%02x\n",
227 hwif->name, mrdmode, irq_mask);
228
229 return (mrdmode & irq_mask) ? 1 : 0;
230}
231
232static int cmd64x_test_irq(ide_hwif_t *hwif)
233{
234 struct pci_dev *dev = to_pci_dev(hwif->dev);
235 int irq_reg = hwif->channel ? ARTTIM23 : CFR;
236 u8 irq_mask = hwif->channel ? ARTTIM23_INTR_CH1 :
237 CFR_INTR_CH0;
238 u8 irq_stat = 0;
239
240 (void) pci_read_config_byte(dev, irq_reg, &irq_stat);
241
242 pr_debug("%s: irq_stat: 0x%02x irq_mask: 0x%02x\n",
243 hwif->name, irq_stat, irq_mask);
244
245 return (irq_stat & irq_mask) ? 1 : 0;
246}
247
248/*
249 * ASUS P55T2P4D with CMD646 chipset revision 0x01 requires the old
250 * event order for DMA transfers.
251 */
252
253static int cmd646_1_dma_end(ide_drive_t *drive)
254{
255 ide_hwif_t *hwif = drive->hwif;
256 u8 dma_stat = 0, dma_cmd = 0;
257
258 /* get DMA status */
259 dma_stat = inb(hwif->dma_base + ATA_DMA_STATUS);
260 /* read DMA command state */
261 dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
262 /* stop DMA */
263 outb(dma_cmd & ~1, hwif->dma_base + ATA_DMA_CMD);
264 /* clear the INTR & ERROR bits */
265 outb(dma_stat | 6, hwif->dma_base + ATA_DMA_STATUS);
266 /* verify good DMA status */
267 return (dma_stat & 7) != 4;
268}
269
270static int init_chipset_cmd64x(struct pci_dev *dev)
271{
272 u8 mrdmode = 0;
273
274 /* Set a good latency timer and cache line size value. */
275 (void) pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
276 /* FIXME: pci_set_master() to ensure a good latency timer value */
277
278 /*
279 * Enable interrupts, select MEMORY READ LINE for reads.
280 *
281 * NOTE: although not mentioned in the PCI0646U specs,
282 * bits 0-1 are write only and won't be read back as
283 * set or not -- PCI0646U2 specs clarify this point.
284 */
285 (void) pci_read_config_byte (dev, MRDMODE, &mrdmode);
286 mrdmode &= ~0x30;
287 (void) pci_write_config_byte(dev, MRDMODE, (mrdmode | 0x02));
288
289 return 0;
290}
291
292static u8 cmd64x_cable_detect(ide_hwif_t *hwif)
293{
294 struct pci_dev *dev = to_pci_dev(hwif->dev);
295 u8 bmidecsr = 0, mask = hwif->channel ? 0x02 : 0x01;
296
297 switch (dev->device) {
298 case PCI_DEVICE_ID_CMD_648:
299 case PCI_DEVICE_ID_CMD_649:
300 pci_read_config_byte(dev, BMIDECSR, &bmidecsr);
301 return (bmidecsr & mask) ? ATA_CBL_PATA80 : ATA_CBL_PATA40;
302 default:
303 return ATA_CBL_PATA40;
304 }
305}
306
307static const struct ide_port_ops cmd64x_port_ops = {
308 .set_pio_mode = cmd64x_set_pio_mode,
309 .set_dma_mode = cmd64x_set_dma_mode,
310 .clear_irq = cmd64x_clear_irq,
311 .test_irq = cmd64x_test_irq,
312 .cable_detect = cmd64x_cable_detect,
313};
314
315static const struct ide_port_ops cmd648_port_ops = {
316 .set_pio_mode = cmd64x_set_pio_mode,
317 .set_dma_mode = cmd64x_set_dma_mode,
318 .clear_irq = cmd648_clear_irq,
319 .test_irq = cmd648_test_irq,
320 .cable_detect = cmd64x_cable_detect,
321};
322
323static const struct ide_dma_ops cmd646_rev1_dma_ops = {
324 .dma_host_set = ide_dma_host_set,
325 .dma_setup = ide_dma_setup,
326 .dma_start = ide_dma_start,
327 .dma_end = cmd646_1_dma_end,
328 .dma_test_irq = ide_dma_test_irq,
329 .dma_lost_irq = ide_dma_lost_irq,
330 .dma_timer_expiry = ide_dma_sff_timer_expiry,
331 .dma_sff_read_status = ide_dma_sff_read_status,
332};
333
334static const struct ide_port_info cmd64x_chipsets[] = {
335 { /* 0: CMD643 */
336 .name = DRV_NAME,
337 .init_chipset = init_chipset_cmd64x,
338 .enablebits = {{0x00,0x00,0x00}, {0x51,0x08,0x08}},
339 .port_ops = &cmd64x_port_ops,
340 .host_flags = IDE_HFLAG_CLEAR_SIMPLEX |
341 IDE_HFLAG_ABUSE_PREFETCH |
342 IDE_HFLAG_SERIALIZE,
343 .pio_mask = ATA_PIO5,
344 .mwdma_mask = ATA_MWDMA2,
345 .udma_mask = 0x00, /* no udma */
346 },
347 { /* 1: CMD646 */
348 .name = DRV_NAME,
349 .init_chipset = init_chipset_cmd64x,
350 .enablebits = {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
351 .port_ops = &cmd648_port_ops,
352 .host_flags = IDE_HFLAG_ABUSE_PREFETCH |
353 IDE_HFLAG_SERIALIZE,
354 .pio_mask = ATA_PIO5,
355 .mwdma_mask = ATA_MWDMA2,
356 .udma_mask = ATA_UDMA2,
357 },
358 { /* 2: CMD648 */
359 .name = DRV_NAME,
360 .init_chipset = init_chipset_cmd64x,
361 .enablebits = {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
362 .port_ops = &cmd648_port_ops,
363 .host_flags = IDE_HFLAG_ABUSE_PREFETCH,
364 .pio_mask = ATA_PIO5,
365 .mwdma_mask = ATA_MWDMA2,
366 .udma_mask = ATA_UDMA4,
367 },
368 { /* 3: CMD649 */
369 .name = DRV_NAME,
370 .init_chipset = init_chipset_cmd64x,
371 .enablebits = {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
372 .port_ops = &cmd648_port_ops,
373 .host_flags = IDE_HFLAG_ABUSE_PREFETCH,
374 .pio_mask = ATA_PIO5,
375 .mwdma_mask = ATA_MWDMA2,
376 .udma_mask = ATA_UDMA5,
377 }
378};
379
380static int cmd64x_init_one(struct pci_dev *dev, const struct pci_device_id *id)
381{
382 struct ide_port_info d;
383 u8 idx = id->driver_data;
384
385 d = cmd64x_chipsets[idx];
386
387 if (idx == 1) {
388 /*
389 * UltraDMA only supported on PCI646U and PCI646U2, which
390 * correspond to revisions 0x03, 0x05 and 0x07 respectively.
391 * Actually, although the CMD tech support people won't
392 * tell me the details, the 0x03 revision cannot support
393 * UDMA correctly without hardware modifications, and even
394 * then it only works with Quantum disks due to some
395 * hold time assumptions in the 646U part which are fixed
396 * in the 646U2.
397 *
398 * So we only do UltraDMA on revision 0x05 and 0x07 chipsets.
399 */
400 if (dev->revision < 5) {
401 d.udma_mask = 0x00;
402 /*
403 * The original PCI0646 didn't have the primary
404 * channel enable bit, it appeared starting with
405 * PCI0646U (i.e. revision ID 3).
406 */
407 if (dev->revision < 3) {
408 d.enablebits[0].reg = 0;
409 d.port_ops = &cmd64x_port_ops;
410 if (dev->revision == 1)
411 d.dma_ops = &cmd646_rev1_dma_ops;
412 }
413 }
414 }
415
416 return ide_pci_init_one(dev, &d, NULL);
417}
418
419static const struct pci_device_id cmd64x_pci_tbl[] = {
420 { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_643), 0 },
421 { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_646), 1 },
422 { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_648), 2 },
423 { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_649), 3 },
424 { 0, },
425};
426MODULE_DEVICE_TABLE(pci, cmd64x_pci_tbl);
427
428static struct pci_driver cmd64x_pci_driver = {
429 .name = "CMD64x_IDE",
430 .id_table = cmd64x_pci_tbl,
431 .probe = cmd64x_init_one,
432 .remove = ide_pci_remove,
433 .suspend = ide_pci_suspend,
434 .resume = ide_pci_resume,
435};
436
437static int __init cmd64x_ide_init(void)
438{
439 return ide_pci_register_driver(&cmd64x_pci_driver);
440}
441
442static void __exit cmd64x_ide_exit(void)
443{
444 pci_unregister_driver(&cmd64x_pci_driver);
445}
446
447module_init(cmd64x_ide_init);
448module_exit(cmd64x_ide_exit);
449
450MODULE_AUTHOR("Eddie Dost, David Miller, Andre Hedrick, Bartlomiej Zolnierkiewicz");
451MODULE_DESCRIPTION("PCI driver module for CMD64x IDE");
452MODULE_LICENSE("GPL");