2 * cmd64x.c: Enable interrupts at initialization time on Ultra/PCI machines.
3 * Due to massive hardware bugs, UltraDMA is only supported
4 * on the 646U2 and not on the 646U.
6 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
7 * Copyright (C) 1998 David S. Miller (davem@redhat.com)
9 * Copyright (C) 1999-2002 Andre Hedrick <andre@linux-ide.org>
10 * Copyright (C) 2007 MontaVista Software, Inc. <source@mvista.com>
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/pci.h>
16 #include <linux/delay.h>
17 #include <linux/hdreg.h>
18 #include <linux/ide.h>
19 #include <linux/init.h>
26 #define cmdprintk(x...) printk(x)
28 #define cmdprintk(x...)
32 * CMD64x specific registers definition.
35 #define CFR_INTR_CH0 0x04
43 #define ARTTIM23_DIS_RA2 0x04
44 #define ARTTIM23_DIS_RA3 0x08
45 #define ARTTIM23_INTR_CH1 0x10
52 #define MRDMODE_INTR_CH0 0x04
53 #define MRDMODE_INTR_CH1 0x08
54 #define UDIDETCR0 0x73
58 #define UDIDETCR1 0x7B
61 static u8 quantize_timing(int timing, int quant)
63 return (timing + quant - 1) / quant;
67 * This routine calculates active/recovery counts and then writes them into
68 * the chipset registers.
70 static void program_cycle_times (ide_drive_t *drive, int cycle_time, int active_time)
72 struct pci_dev *dev = to_pci_dev(drive->hwif->dev);
73 int clock_time = 1000 / system_bus_clock();
74 u8 cycle_count, active_count, recovery_count, drwtim;
75 static const u8 recovery_values[] =
76 {15, 15, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 0};
77 static const u8 drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM2, DRWTIM3};
79 cmdprintk("program_cycle_times parameters: total=%d, active=%d\n",
80 cycle_time, active_time);
82 cycle_count = quantize_timing( cycle_time, clock_time);
83 active_count = quantize_timing(active_time, clock_time);
84 recovery_count = cycle_count - active_count;
87 * In case we've got too long recovery phase, try to lengthen
90 if (recovery_count > 16) {
91 active_count += recovery_count - 16;
94 if (active_count > 16) /* shouldn't actually happen... */
97 cmdprintk("Final counts: total=%d, active=%d, recovery=%d\n",
98 cycle_count, active_count, recovery_count);
101 * Convert values to internal chipset representation
103 recovery_count = recovery_values[recovery_count];
104 active_count &= 0x0f;
106 /* Program the active/recovery counts into the DRWTIM register */
107 drwtim = (active_count << 4) | recovery_count;
108 (void) pci_write_config_byte(dev, drwtim_regs[drive->dn], drwtim);
109 cmdprintk("Write 0x%02x to reg 0x%x\n", drwtim, drwtim_regs[drive->dn]);
113 * This routine writes into the chipset registers
114 * PIO setup/active/recovery timings.
116 static void cmd64x_tune_pio(ide_drive_t *drive, const u8 pio)
118 ide_hwif_t *hwif = HWIF(drive);
119 struct pci_dev *dev = to_pci_dev(hwif->dev);
120 unsigned int cycle_time;
121 u8 setup_count, arttim = 0;
123 static const u8 setup_values[] = {0x40, 0x40, 0x40, 0x80, 0, 0xc0};
124 static const u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};
126 cycle_time = ide_pio_cycle_time(drive, pio);
128 program_cycle_times(drive, cycle_time,
129 ide_pio_timings[pio].active_time);
131 setup_count = quantize_timing(ide_pio_timings[pio].setup_time,
132 1000 / system_bus_clock());
135 * The primary channel has individual address setup timing registers
136 * for each drive and the hardware selects the slowest timing itself.
137 * The secondary channel has one common register and we have to select
138 * the slowest address setup timing ourselves.
141 ide_drive_t *drives = hwif->drives;
143 drive->drive_data = setup_count;
144 setup_count = max(drives[0].drive_data, drives[1].drive_data);
147 if (setup_count > 5) /* shouldn't actually happen... */
149 cmdprintk("Final address setup count: %d\n", setup_count);
152 * Program the address setup clocks into the ARTTIM registers.
153 * Avoid clearing the secondary channel's interrupt bit.
155 (void) pci_read_config_byte (dev, arttim_regs[drive->dn], &arttim);
157 arttim &= ~ARTTIM23_INTR_CH1;
159 arttim |= setup_values[setup_count];
160 (void) pci_write_config_byte(dev, arttim_regs[drive->dn], arttim);
161 cmdprintk("Write 0x%02x to reg 0x%x\n", arttim, arttim_regs[drive->dn]);
165 * Attempts to set drive's PIO mode.
166 * Special cases are 8: prefetch off, 9: prefetch on (both never worked)
169 static void cmd64x_set_pio_mode(ide_drive_t *drive, const u8 pio)
172 * Filter out the prefetch control values
173 * to prevent PIO5 from being programmed
175 if (pio == 8 || pio == 9)
178 cmd64x_tune_pio(drive, pio);
181 static void cmd64x_set_dma_mode(ide_drive_t *drive, const u8 speed)
183 ide_hwif_t *hwif = HWIF(drive);
184 struct pci_dev *dev = to_pci_dev(hwif->dev);
185 u8 unit = drive->dn & 0x01;
186 u8 regU = 0, pciU = hwif->channel ? UDIDETCR1 : UDIDETCR0;
188 if (speed >= XFER_SW_DMA_0) {
189 (void) pci_read_config_byte(dev, pciU, ®U);
190 regU &= ~(unit ? 0xCA : 0x35);
195 regU |= unit ? 0x0A : 0x05;
198 regU |= unit ? 0x4A : 0x15;
201 regU |= unit ? 0x8A : 0x25;
204 regU |= unit ? 0x42 : 0x11;
207 regU |= unit ? 0x82 : 0x21;
210 regU |= unit ? 0xC2 : 0x31;
213 program_cycle_times(drive, 120, 70);
216 program_cycle_times(drive, 150, 80);
219 program_cycle_times(drive, 480, 215);
223 if (speed >= XFER_SW_DMA_0)
224 (void) pci_write_config_byte(dev, pciU, regU);
227 static int cmd648_ide_dma_end (ide_drive_t *drive)
229 ide_hwif_t *hwif = HWIF(drive);
230 unsigned long base = hwif->dma_base - (hwif->channel * 8);
231 int err = __ide_dma_end(drive);
232 u8 irq_mask = hwif->channel ? MRDMODE_INTR_CH1 :
234 u8 mrdmode = inb(base + 1);
236 /* clear the interrupt bit */
237 outb((mrdmode & ~(MRDMODE_INTR_CH0 | MRDMODE_INTR_CH1)) | irq_mask,
243 static int cmd64x_ide_dma_end (ide_drive_t *drive)
245 ide_hwif_t *hwif = HWIF(drive);
246 struct pci_dev *dev = to_pci_dev(hwif->dev);
247 int irq_reg = hwif->channel ? ARTTIM23 : CFR;
248 u8 irq_mask = hwif->channel ? ARTTIM23_INTR_CH1 :
251 int err = __ide_dma_end(drive);
253 (void) pci_read_config_byte(dev, irq_reg, &irq_stat);
254 /* clear the interrupt bit */
255 (void) pci_write_config_byte(dev, irq_reg, irq_stat | irq_mask);
260 static int cmd648_ide_dma_test_irq (ide_drive_t *drive)
262 ide_hwif_t *hwif = HWIF(drive);
263 unsigned long base = hwif->dma_base - (hwif->channel * 8);
264 u8 irq_mask = hwif->channel ? MRDMODE_INTR_CH1 :
266 u8 dma_stat = inb(hwif->dma_status);
267 u8 mrdmode = inb(base + 1);
270 printk("%s: dma_stat: 0x%02x mrdmode: 0x%02x irq_mask: 0x%02x\n",
271 drive->name, dma_stat, mrdmode, irq_mask);
273 if (!(mrdmode & irq_mask))
276 /* return 1 if INTR asserted */
283 static int cmd64x_ide_dma_test_irq (ide_drive_t *drive)
285 ide_hwif_t *hwif = HWIF(drive);
286 struct pci_dev *dev = to_pci_dev(hwif->dev);
287 int irq_reg = hwif->channel ? ARTTIM23 : CFR;
288 u8 irq_mask = hwif->channel ? ARTTIM23_INTR_CH1 :
290 u8 dma_stat = inb(hwif->dma_status);
293 (void) pci_read_config_byte(dev, irq_reg, &irq_stat);
296 printk("%s: dma_stat: 0x%02x irq_stat: 0x%02x irq_mask: 0x%02x\n",
297 drive->name, dma_stat, irq_stat, irq_mask);
299 if (!(irq_stat & irq_mask))
302 /* return 1 if INTR asserted */
310 * ASUS P55T2P4D with CMD646 chipset revision 0x01 requires the old
311 * event order for DMA transfers.
314 static int cmd646_1_ide_dma_end (ide_drive_t *drive)
316 ide_hwif_t *hwif = HWIF(drive);
317 u8 dma_stat = 0, dma_cmd = 0;
319 drive->waiting_for_dma = 0;
321 dma_stat = inb(hwif->dma_status);
322 /* read DMA command state */
323 dma_cmd = inb(hwif->dma_command);
325 outb(dma_cmd & ~1, hwif->dma_command);
326 /* clear the INTR & ERROR bits */
327 outb(dma_stat | 6, hwif->dma_status);
328 /* and free any DMA resources */
329 ide_destroy_dmatable(drive);
330 /* verify good DMA status */
331 return (dma_stat & 7) != 4;
334 static unsigned int __devinit init_chipset_cmd64x(struct pci_dev *dev, const char *name)
338 if (dev->device == PCI_DEVICE_ID_CMD_646) {
340 switch (dev->revision) {
343 printk("%s: UltraDMA capable\n", name);
347 printk("%s: MultiWord DMA force limited\n", name);
350 printk("%s: MultiWord DMA limited, "
351 "IRQ workaround enabled\n", name);
356 /* Set a good latency timer and cache line size value. */
357 (void) pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
358 /* FIXME: pci_set_master() to ensure a good latency timer value */
361 * Enable interrupts, select MEMORY READ LINE for reads.
363 * NOTE: although not mentioned in the PCI0646U specs,
364 * bits 0-1 are write only and won't be read back as
365 * set or not -- PCI0646U2 specs clarify this point.
367 (void) pci_read_config_byte (dev, MRDMODE, &mrdmode);
369 (void) pci_write_config_byte(dev, MRDMODE, (mrdmode | 0x02));
374 static u8 __devinit ata66_cmd64x(ide_hwif_t *hwif)
376 struct pci_dev *dev = to_pci_dev(hwif->dev);
377 u8 bmidecsr = 0, mask = hwif->channel ? 0x02 : 0x01;
379 switch (dev->device) {
380 case PCI_DEVICE_ID_CMD_648:
381 case PCI_DEVICE_ID_CMD_649:
382 pci_read_config_byte(dev, BMIDECSR, &bmidecsr);
383 return (bmidecsr & mask) ? ATA_CBL_PATA80 : ATA_CBL_PATA40;
385 return ATA_CBL_PATA40;
389 static void __devinit init_hwif_cmd64x(ide_hwif_t *hwif)
391 struct pci_dev *dev = to_pci_dev(hwif->dev);
393 hwif->set_pio_mode = &cmd64x_set_pio_mode;
394 hwif->set_dma_mode = &cmd64x_set_dma_mode;
400 * UltraDMA only supported on PCI646U and PCI646U2, which
401 * correspond to revisions 0x03, 0x05 and 0x07 respectively.
402 * Actually, although the CMD tech support people won't
403 * tell me the details, the 0x03 revision cannot support
404 * UDMA correctly without hardware modifications, and even
405 * then it only works with Quantum disks due to some
406 * hold time assumptions in the 646U part which are fixed
409 * So we only do UltraDMA on revision 0x05 and 0x07 chipsets.
411 if (dev->device == PCI_DEVICE_ID_CMD_646 && dev->revision < 5)
412 hwif->ultra_mask = 0x00;
414 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
415 hwif->cbl = ata66_cmd64x(hwif);
417 switch (dev->device) {
418 case PCI_DEVICE_ID_CMD_648:
419 case PCI_DEVICE_ID_CMD_649:
421 hwif->ide_dma_end = &cmd648_ide_dma_end;
422 hwif->ide_dma_test_irq = &cmd648_ide_dma_test_irq;
424 case PCI_DEVICE_ID_CMD_646:
425 if (dev->revision == 0x01) {
426 hwif->ide_dma_end = &cmd646_1_ide_dma_end;
428 } else if (dev->revision >= 0x03)
432 hwif->ide_dma_end = &cmd64x_ide_dma_end;
433 hwif->ide_dma_test_irq = &cmd64x_ide_dma_test_irq;
438 static const struct ide_port_info cmd64x_chipsets[] __devinitdata = {
441 .init_chipset = init_chipset_cmd64x,
442 .init_hwif = init_hwif_cmd64x,
443 .enablebits = {{0x00,0x00,0x00}, {0x51,0x08,0x08}},
444 .host_flags = IDE_HFLAG_CLEAR_SIMPLEX |
445 IDE_HFLAG_ABUSE_PREFETCH |
447 .pio_mask = ATA_PIO5,
448 .mwdma_mask = ATA_MWDMA2,
449 .udma_mask = 0x00, /* no udma */
452 .init_chipset = init_chipset_cmd64x,
453 .init_hwif = init_hwif_cmd64x,
454 .enablebits = {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
455 .chipset = ide_cmd646,
456 .host_flags = IDE_HFLAG_ABUSE_PREFETCH | IDE_HFLAG_BOOTABLE,
457 .pio_mask = ATA_PIO5,
458 .mwdma_mask = ATA_MWDMA2,
459 .udma_mask = ATA_UDMA2,
462 .init_chipset = init_chipset_cmd64x,
463 .init_hwif = init_hwif_cmd64x,
464 .enablebits = {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
465 .host_flags = IDE_HFLAG_ABUSE_PREFETCH | IDE_HFLAG_BOOTABLE,
466 .pio_mask = ATA_PIO5,
467 .mwdma_mask = ATA_MWDMA2,
468 .udma_mask = ATA_UDMA4,
471 .init_chipset = init_chipset_cmd64x,
472 .init_hwif = init_hwif_cmd64x,
473 .enablebits = {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
474 .host_flags = IDE_HFLAG_ABUSE_PREFETCH | IDE_HFLAG_BOOTABLE,
475 .pio_mask = ATA_PIO5,
476 .mwdma_mask = ATA_MWDMA2,
477 .udma_mask = ATA_UDMA5,
481 static int __devinit cmd64x_init_one(struct pci_dev *dev, const struct pci_device_id *id)
483 struct ide_port_info d;
484 u8 idx = id->driver_data;
486 d = cmd64x_chipsets[idx];
489 * The original PCI0646 didn't have the primary channel enable bit,
490 * it appeared starting with PCI0646U (i.e. revision ID 3).
492 if (idx == 1 && dev->revision < 3)
493 d.enablebits[0].reg = 0;
495 return ide_setup_pci_device(dev, &d);
498 static const struct pci_device_id cmd64x_pci_tbl[] = {
499 { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_643), 0 },
500 { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_646), 1 },
501 { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_648), 2 },
502 { PCI_VDEVICE(CMD, PCI_DEVICE_ID_CMD_649), 3 },
505 MODULE_DEVICE_TABLE(pci, cmd64x_pci_tbl);
507 static struct pci_driver driver = {
508 .name = "CMD64x_IDE",
509 .id_table = cmd64x_pci_tbl,
510 .probe = cmd64x_init_one,
513 static int __init cmd64x_ide_init(void)
515 return ide_pci_register_driver(&driver);
518 module_init(cmd64x_ide_init);
520 MODULE_AUTHOR("Eddie Dost, David Miller, Andre Hedrick");
521 MODULE_DESCRIPTION("PCI driver module for CMD64x IDE");
522 MODULE_LICENSE("GPL");