aboutsummaryrefslogtreecommitdiff
path: root/drivers/parisc/superio.c
blob: 589bd635e50febfc0f83eb75ad60e9d780480a92 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
/*      National Semiconductor NS87560UBD Super I/O controller used in
 *      HP [BCJ]x000 workstations.
 *
 *      This chip is a horrid piece of engineering, and National
 *      denies any knowledge of its existence. Thus no datasheet is
 *      available off www.national.com. 
 *
 *	(C) Copyright 2000 Linuxcare, Inc.
 * 	(C) Copyright 2000 Linuxcare Canada, Inc.
 *	(C) Copyright 2000 Martin K. Petersen <mkp@linuxcare.com>
 * 	(C) Copyright 2000 Alex deVries <alex@onefishtwo.ca>
 *      (C) Copyright 2001 John Marvin <jsm fc hp com>
 *      (C) Copyright 2003 Grant Grundler <grundler parisc-linux org>
 *	(C) Copyright 2005 Kyle McMartin <kyle@parisc-linux.org>
 *	(C) Copyright 2006 Helge Deller <deller@gmx.de>
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License as
 *	published by the Free Software Foundation; either version 2 of
 *	the License, or (at your option) any later version.  
 *
 *	The initial version of this is by Martin Peterson.  Alex deVries
 *	has spent a bit of time trying to coax it into working.
 *
 *      Major changes to get basic interrupt infrastructure working to
 *      hopefully be able to support all SuperIO devices. Currently
 *      works with serial. -- John Marvin <jsm@fc.hp.com>
 *
 *	Converted superio_init() to be a PCI_FIXUP_FINAL callee.
 *         -- Kyle McMartin <kyle@parisc-linux.org>
 */


/* NOTES:
 * 
 * Function 0 is an IDE controller. It is identical to a PC87415 IDE
 * controller (and identifies itself as such).
 *
 * Function 1 is a "Legacy I/O" controller. Under this function is a
 * whole mess of legacy I/O peripherals. Of course, HP hasn't enabled
 * all the functionality in hardware, but the following is available:
 *
 *      Two 16550A compatible serial controllers
 *      An IEEE 1284 compatible parallel port
 *      A floppy disk controller
 *
 * Function 2 is a USB controller.
 *
 * We must be incredibly careful during initialization.  Since all
 * interrupts are routed through function 1 (which is not allowed by
 * the PCI spec), we need to program the PICs on the legacy I/O port
 * *before* we attempt to set up IDE and USB.  @#$!&
 *
 * According to HP, devices are only enabled by firmware if they have
 * a physical device connected.
 *
 * Configuration register bits:
 *     0x5A: FDC, SP1, IDE1, SP2, IDE2, PAR, Reserved, P92
 *     0x5B: RTC, 8259, 8254, DMA1, DMA2, KBC, P61, APM
 *
 */

#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/serial.h>
#include <linux/pci.h>
#include <linux/parport.h>
#include <linux/parport_pc.h>
#include <linux/termios.h>
#include <linux/tty.h>
#include <linux/serial_core.h>
#include <linux/serial_8250.h>
#include <linux/delay.h>

#include <asm/io.h>
#include <asm/hardware.h>
#include <asm/superio.h>

static struct superio_device sio_dev;


#undef DEBUG_SUPERIO_INIT

#ifdef DEBUG_SUPERIO_INIT
#define DBG_INIT(x...)  printk(x)
#else
#define DBG_INIT(x...)
#endif

#define SUPERIO	"SuperIO"
#define PFX	SUPERIO ": "

static irqreturn_t
superio_interrupt(int parent_irq, void *devp)
{
	u8 results;
	u8 local_irq;

	/* Poll the 8259 to see if there's an interrupt. */
	outb (OCW3_POLL,IC_PIC1+0);

	results = inb(IC_PIC1+0);

	/*
	 * Bit    7:	1 = active Interrupt; 0 = no Interrupt pending
	 * Bits 6-3:	zero
	 * Bits 2-0:	highest priority, active requesting interrupt ID (0-7)
	 */
	if ((results & 0x80) == 0) {
		/* I suspect "spurious" interrupts are from unmasking an IRQ.
		 * We don't know if an interrupt was/is pending and thus
		 * just call the handler for that IRQ as if it were pending.
		 */
		return IRQ_NONE;
	}

	/* Check to see which device is interrupting */
	local_irq = results & 0x0f;

	if (local_irq == 2 || local_irq > 7) {
		printk(KERN_ERR PFX "slave interrupted!\n");
		return IRQ_HANDLED;
	}

	if (local_irq == 7) {

		/* Could be spurious. Check in service bits */

		outb(OCW3_ISR,IC_PIC1+0);
		results = inb(IC_PIC1+0);
		if ((results & 0x80) == 0) { /* if ISR7 not set: spurious */
			printk(KERN_WARNING PFX "spurious interrupt!\n");
			return IRQ_HANDLED;
		}
	}

	/* Call the appropriate device's interrupt */
	__do_IRQ(local_irq);

	/* set EOI - forces a new interrupt if a lower priority device
	 * still needs service.
	 */
	outb((OCW2_SEOI|local_irq),IC_PIC1 + 0);
	return IRQ_HANDLED;
}

/* Initialize Super I/O device */
static void
superio_init(struct pci_dev *pcidev)
{
	struct superio_device *sio = &sio_dev;
	struct pci_dev *pdev = sio->lio_pdev;
	u16 word;
	int ret;

	if (sio->suckyio_irq_enabled)
		return;

	BUG_ON(!pdev);
	BUG_ON(!sio->usb_pdev);

	/* use the IRQ iosapic found for USB INT D... */
	pdev->irq = sio->usb_pdev->irq;

	/* ...then properly fixup the USB to point at suckyio PIC */
	sio->usb_pdev->irq = superio_fixup_irq(sio->usb_pdev);

	printk(KERN_INFO PFX "Found NS87560 Legacy I/O device at %s (IRQ %i) \n",
	       pci_name(pdev), pdev->irq);

	pci_read_config_dword (pdev, SIO_SP1BAR, &sio->sp1_base);
	sio->sp1_base &= ~1;
	printk(KERN_INFO PFX "Serial port 1 at 0x%x\n", sio->sp1_base);

	pci_read_config_dword (pdev, SIO_SP2BAR, &sio->sp2_base);
	sio->sp2_base &= ~1;
	printk(KERN_INFO PFX "Serial port 2 at 0x%x\n", sio->sp2_base);

	pci_read_config_dword (pdev, SIO_PPBAR, &sio->pp_base);
	sio->pp_base &= ~1;
	printk(KERN_INFO PFX "Parallel port at 0x%x\n", sio->pp_base);

	pci_read_config_dword (pdev, SIO_FDCBAR, &sio->fdc_base);
	sio->fdc_base &= ~1;
	printk(KERN_INFO PFX "Floppy controller at 0x%x\n", sio->fdc_base);
	pci_read_config_dword (pdev, SIO_ACPIBAR, &sio->acpi_base);
	sio->acpi_base &= ~1;
	printk(KERN_INFO PFX "ACPI at 0x%x\n", sio->acpi_base);

	request_region (IC_PIC1, 0x1f, "pic1");
	request_region (IC_PIC2, 0x1f, "pic2");
	request_region (sio->acpi_base, 0x1f, "acpi");

	/* Enable the legacy I/O function */
	pci_read_config_word (pdev, PCI_COMMAND, &word);
	word |= PCI_COMMAND_SERR | PCI_COMMAND_PARITY | PCI_COMMAND_IO;
	pci_write_config_word (pdev, PCI_COMMAND, word);

	pci_set_master (pdev);
	ret = pci_enable_device(pdev);
	BUG_ON(ret < 0);	/* not too much we can do about this... */

	/*
	 * Next project is programming the onboard interrupt controllers.
	 * PDC hasn't done this for us, since it's using polled I/O.
	 *
	 * XXX Use dword writes to avoid bugs in Elroy or Suckyio Config
	 *     space access.  PCI is by nature a 32-bit bus and config
	 *     space can be sensitive to that.
	 */

	/* 0x64 - 0x67 :
		DMA Rtg 2
		DMA Rtg 3
		DMA Chan Ctl
		TRIGGER_1    == 0x82   USB & IDE level triggered, rest to edge
	*/
	pci_write_config_dword (pdev, 0x64,         0x82000000U);

	/* 0x68 - 0x6b :
		TRIGGER_2    == 0x00   all edge triggered (not used)
		CFG_IR_SER   == 0x43   SerPort1 = IRQ3, SerPort2 = IRQ4
		CFG_IR_PF    == 0x65   ParPort  = IRQ5, FloppyCtlr = IRQ6
		CFG_IR_IDE   == 0x07   IDE1 = IRQ7, reserved
	*/
	pci_write_config_dword (pdev, TRIGGER_2,    0x07654300U);

	/* 0x6c - 0x6f :
		CFG_IR_INTAB == 0x00
		CFG_IR_INTCD == 0x10   USB = IRQ1
		CFG_IR_PS2   == 0x00
		CFG_IR_FXBUS == 0x00
	*/
	pci_write_config_dword (pdev, CFG_IR_INTAB, 0x00001000U);

	/* 0x70 - 0x73 :
		CFG_IR_USB   == 0x00  not used. USB is connected to INTD.
		CFG_IR_ACPI  == 0x00  not used.
		DMA Priority == 0x4c88  Power on default value. NFC.
	*/
	pci_write_config_dword (pdev, CFG_IR_USB, 0x4c880000U);

	/* PIC1 Initialization Command Word register programming */
	outb (0x11,IC_PIC1+0);	/* ICW1: ICW4 write req | ICW1 */
	outb (0x00,IC_PIC1+1);	/* ICW2: interrupt vector table - not used */
	outb (0x04,IC_PIC1+1);	/* ICW3: Cascade */
	outb (0x01,IC_PIC1+1);	/* ICW4: x86 mode */

	/* PIC1 Program Operational Control Words */
	outb (0xff,IC_PIC1+1);	/* OCW1: Mask all interrupts */
	outb (0xc2,IC_PIC1+0);  /* OCW2: priority (3-7,0-2) */

	/* PIC2 Initialization Command Word register programming */
	outb (0x11,IC_PIC2+0);	/* ICW1: ICW4 write req | ICW1 */
	outb (0x00,IC_PIC2+1);	/* ICW2: N/A */
	outb (0x02,IC_PIC2+1);	/* ICW3: Slave ID code */
	outb (0x01,IC_PIC2+1);	/* ICW4: x86 mode */
		
	/* Program Operational Control Words */
	outb (0xff,IC_PIC1+1);	/* OCW1: Mask all interrupts */
	outb (0x68,IC_PIC1+0);	/* OCW3: OCW3 select | ESMM | SMM */

	/* Write master mask reg */
	outb (0xff,IC_PIC1+1);

	/* Setup USB power regulation */
	outb(1, sio->acpi_base + USB_REG_CR);
	if (inb(sio->acpi_base + USB_REG_CR) & 1)
		printk(KERN_INFO PFX "USB regulator enabled\n");
	else
		printk(KERN_ERR PFX "USB regulator not initialized!\n");

	if (request_irq(pdev->irq, superio_interrupt, IRQF_DISABLED,
			SUPERIO, (void *)sio)) {

		printk(KERN_ERR PFX "could not get irq\n");
		BUG();
		return;
	}

	sio->suckyio_irq_enabled = 1;
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87560_LIO, superio_init);

static void superio_disable_irq(unsigned int irq)
{
	u8 r8;

	if ((irq < 1) || (irq == 2) || (irq > 7)) {
		printk(KERN_ERR PFX "Illegal irq number.\n");
		BUG();
		return;
	}

	/* Mask interrupt */

	r8 = inb(IC_PIC1+1);
	r8 |= (1 << irq);
	outb (r8,IC_PIC1+1);
}

static void superio_enable_irq(unsigned int irq)
{
	u8 r8;

	if ((irq < 1) || (irq == 2) || (irq > 7)) {
		printk(KERN_ERR PFX "Illegal irq number (%d).\n", irq);
		BUG();
		return;
	}

	/* Unmask interrupt */
	r8 = inb(IC_PIC1+1);
	r8 &= ~(1 << irq);
	outb (r8,IC_PIC1+1);
}

static unsigned int superio_startup_irq(unsigned int irq)
{
	superio_enable_irq(irq);
	return 0;
}

static struct irq_chip superio_interrupt_type = {
	.typename =	SUPERIO,
	.startup =	superio_startup_irq,
	.shutdown =	superio_disable_irq,
	.enable =	superio_enable_irq,
	.disable =	superio_disable_irq,
	.ack =		no_ack_irq,
	.end =		no_end_irq,
};

#ifdef DEBUG_SUPERIO_INIT
static unsigned short expected_device[3] = {
	PCI_DEVICE_ID_NS_87415,
	PCI_DEVICE_ID_NS_87560_LIO,
	PCI_DEVICE_ID_NS_87560_USB
};
#endif

int superio_fixup_irq(struct pci_dev *pcidev)
{
	int local_irq, i;

#ifdef DEBUG_SUPERIO_INIT
	int fn;
	fn = PCI_FUNC(pcidev->devfn);

	/* Verify the function number matches the expected device id. */
	if (expected_device[fn] != pcidev->device) {
		BUG();
		return -1;
	}
	printk("superio_fixup_irq(%s) ven 0x%x dev 0x%x from %p\n",
		pci_name(pcidev),
		pcidev->vendor, pcidev->device,
		__builtin_return_address(0));
#endif

	for (i = 0; i < 16; i++) {
		struct irq_desc *desc = irq_to_desc(i);

		desc->chip = &superio_interrupt_type;
	}

	/*
	 * We don't allocate a SuperIO irq for the legacy IO function,
	 * since it is a "bridge". Instead, we will allocate irq's for
	 * each legacy device as they are initialized.
	 */

	switch(pcidev->device) {
	case PCI_DEVICE_ID_NS_87415:		/* Function 0 */
		local_irq = IDE_IRQ;
		break;
	case PCI_DEVICE_ID_NS_87560_LIO:	/* Function 1 */
		sio_dev.lio_pdev = pcidev;	/* save for superio_init() */
		return -1;
	case PCI_DEVICE_ID_NS_87560_USB:	/* Function 2 */
		sio_dev.usb_pdev = pcidev;	/* save for superio_init() */
		local_irq = USB_IRQ;
		break;
	default:
		local_irq = -1;
		BUG();
		break;
	}

	return local_irq;
}

static void __init superio_serial_init(void)
{
#ifdef CONFIG_SERIAL_8250
	int retval;
	struct uart_port serial_port;

	memset(&serial_port, 0, sizeof(serial_port));
	serial_port.iotype	= UPIO_PORT;
	serial_port.type	= PORT_16550A;
	serial_port.uartclk	= 115200*16;
	serial_port.fifosize	= 16;

	/* serial port #1 */
	serial_port.iobase	= sio_dev.sp1_base;
	serial_port.irq		= SP1_IRQ;
	serial_port.line	= 0;
	retval = early_serial_setup(&serial_port);
	if (retval < 0) {
		printk(KERN_WARNING PFX "Register Serial #0 failed.\n");
		return;
	}

	/* serial port #2 */
	serial_port.iobase	= sio_dev.sp2_base;
	serial_port.irq		= SP2_IRQ;
	serial_port.line	= 1;
	retval = early_serial_setup(&serial_port);
	if (retval < 0)
		printk(KERN_WARNING PFX "Register Serial #1 failed.\n");
#endif /* CONFIG_SERIAL_8250 */
}


static void __init superio_parport_init(void)
{
#ifdef CONFIG_PARPORT_PC
	if (!parport_pc_probe_port(sio_dev.pp_base,
			0 /*base_hi*/,
			PAR_IRQ, 
			PARPORT_DMA_NONE /* dma */,
			NULL /*struct pci_dev* */),
			0 /* shared irq flags */ )

		printk(KERN_WARNING PFX "Probing parallel port failed.\n");
#endif	/* CONFIG_PARPORT_PC */
}


static void superio_fixup_pci(struct pci_dev *pdev)
{
	u8 prog;

	pdev->class |= 0x5;
	pci_write_config_byte(pdev, PCI_CLASS_PROG, pdev->class);

	pci_read_config_byte(pdev, PCI_CLASS_PROG, &prog);
	printk("PCI: Enabled native mode for NS87415 (pif=0x%x)\n", prog);
}
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87415, superio_fixup_pci);


static int __init
superio_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
	struct superio_device *sio = &sio_dev;

	/*
	** superio_probe(00:0e.0) ven 0x100b dev 0x2 sv 0x0 sd 0x0 class 0x1018a
	** superio_probe(00:0e.1) ven 0x100b dev 0xe sv 0x0 sd 0x0 class 0x68000
	** superio_probe(00:0e.2) ven 0x100b dev 0x12 sv 0x0 sd 0x0 class 0xc0310
	*/
	DBG_INIT("superio_probe(%s) ven 0x%x dev 0x%x sv 0x%x sd 0x%x class 0x%x\n",
		pci_name(dev),
		dev->vendor, dev->device,
		dev->subsystem_vendor, dev->subsystem_device,
		dev->class);

	BUG_ON(!sio->suckyio_irq_enabled);	/* Enabled by PCI_FIXUP_FINAL */

	if (dev->device == PCI_DEVICE_ID_NS_87560_LIO) {	/* Function 1 */
		superio_parport_init();
		superio_serial_init();
		/* REVISIT XXX : superio_fdc_init() ? */
		return 0;
	} else if (dev->device == PCI_DEVICE_ID_NS_87415) {	/* Function 0 */
		DBG_INIT("superio_probe: ignoring IDE 87415\n");
	} else if (dev->device == PCI_DEVICE_ID_NS_87560_USB) {	/* Function 2 */
		DBG_INIT("superio_probe: ignoring USB OHCI controller\n");
	} else {
		DBG_INIT("superio_probe: WTF? Fire Extinguisher?\n");
	}

	/* Let appropriate other driver claim this device. */
	return -ENODEV;
}

static const struct pci_device_id superio_tbl[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87560_LIO) },
	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87560_USB) },
	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87415) },
	{ 0, }
};

static struct pci_driver superio_driver = {
	.name =         SUPERIO,
	.id_table =     superio_tbl,
	.probe =        superio_probe,
};

static int __init superio_modinit(void)
{
	return pci_register_driver(&superio_driver);
}

static void __exit superio_exit(void)
{
	pci_unregister_driver(&superio_driver);
}

module_init(superio_modinit);
module_exit(superio_exit);