xref: /openbmc/linux/drivers/parisc/superio.c (revision 234489ac)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*      National Semiconductor NS87560UBD Super I/O controller used in
3  *      HP [BCJ]x000 workstations.
4  *
5  *      This chip is a horrid piece of engineering, and National
6  *      denies any knowledge of its existence. Thus no datasheet is
7  *      available off www.national.com.
8  *
9  *	(C) Copyright 2000 Linuxcare, Inc.
10  * 	(C) Copyright 2000 Linuxcare Canada, Inc.
11  *	(C) Copyright 2000 Martin K. Petersen <mkp@linuxcare.com>
12  * 	(C) Copyright 2000 Alex deVries <alex@onefishtwo.ca>
13  *      (C) Copyright 2001 John Marvin <jsm fc hp com>
14  *      (C) Copyright 2003 Grant Grundler <grundler parisc-linux org>
15  *	(C) Copyright 2005 Kyle McMartin <kyle@parisc-linux.org>
16  *	(C) Copyright 2006 Helge Deller <deller@gmx.de>
17  *
18  *	The initial version of this is by Martin Peterson.  Alex deVries
19  *	has spent a bit of time trying to coax it into working.
20  *
21  *      Major changes to get basic interrupt infrastructure working to
22  *      hopefully be able to support all SuperIO devices. Currently
23  *      works with serial. -- John Marvin <jsm@fc.hp.com>
24  *
25  *	Converted superio_init() to be a PCI_FIXUP_FINAL callee.
26  *         -- Kyle McMartin <kyle@parisc-linux.org>
27  */
28 
29 
30 /* NOTES:
31  *
32  * Function 0 is an IDE controller. It is identical to a PC87415 IDE
33  * controller (and identifies itself as such).
34  *
35  * Function 1 is a "Legacy I/O" controller. Under this function is a
36  * whole mess of legacy I/O peripherals. Of course, HP hasn't enabled
37  * all the functionality in hardware, but the following is available:
38  *
39  *      Two 16550A compatible serial controllers
40  *      An IEEE 1284 compatible parallel port
41  *      A floppy disk controller
42  *
43  * Function 2 is a USB controller.
44  *
45  * We must be incredibly careful during initialization.  Since all
46  * interrupts are routed through function 1 (which is not allowed by
47  * the PCI spec), we need to program the PICs on the legacy I/O port
48  * *before* we attempt to set up IDE and USB.  @#$!&
49  *
50  * According to HP, devices are only enabled by firmware if they have
51  * a physical device connected.
52  *
53  * Configuration register bits:
54  *     0x5A: FDC, SP1, IDE1, SP2, IDE2, PAR, Reserved, P92
55  *     0x5B: RTC, 8259, 8254, DMA1, DMA2, KBC, P61, APM
56  *
57  */
58 
59 #include <linux/errno.h>
60 #include <linux/init.h>
61 #include <linux/module.h>
62 #include <linux/types.h>
63 #include <linux/interrupt.h>
64 #include <linux/ioport.h>
65 #include <linux/serial.h>
66 #include <linux/pci.h>
67 #include <linux/parport.h>
68 #include <linux/parport_pc.h>
69 #include <linux/termios.h>
70 #include <linux/tty.h>
71 #include <linux/serial_core.h>
72 #include <linux/serial_8250.h>
73 #include <linux/delay.h>
74 
75 #include <asm/io.h>
76 #include <asm/hardware.h>
77 #include <asm/superio.h>
78 
79 static struct superio_device sio_dev;
80 
81 
82 #undef DEBUG_SUPERIO_INIT
83 
84 #ifdef DEBUG_SUPERIO_INIT
85 #define DBG_INIT(x...)  printk(x)
86 #else
87 #define DBG_INIT(x...)
88 #endif
89 
90 #define SUPERIO	"SuperIO"
91 #define PFX	SUPERIO ": "
92 
93 static irqreturn_t
94 superio_interrupt(int parent_irq, void *devp)
95 {
96 	u8 results;
97 	u8 local_irq;
98 
99 	/* Poll the 8259 to see if there's an interrupt. */
100 	outb (OCW3_POLL,IC_PIC1+0);
101 
102 	results = inb(IC_PIC1+0);
103 
104 	/*
105 	 * Bit    7:	1 = active Interrupt; 0 = no Interrupt pending
106 	 * Bits 6-3:	zero
107 	 * Bits 2-0:	highest priority, active requesting interrupt ID (0-7)
108 	 */
109 	if ((results & 0x80) == 0) {
110 		/* I suspect "spurious" interrupts are from unmasking an IRQ.
111 		 * We don't know if an interrupt was/is pending and thus
112 		 * just call the handler for that IRQ as if it were pending.
113 		 */
114 		return IRQ_NONE;
115 	}
116 
117 	/* Check to see which device is interrupting */
118 	local_irq = results & 0x0f;
119 
120 	if (local_irq == 2 || local_irq > 7) {
121 		printk(KERN_ERR PFX "slave interrupted!\n");
122 		return IRQ_HANDLED;
123 	}
124 
125 	if (local_irq == 7) {
126 
127 		/* Could be spurious. Check in service bits */
128 
129 		outb(OCW3_ISR,IC_PIC1+0);
130 		results = inb(IC_PIC1+0);
131 		if ((results & 0x80) == 0) { /* if ISR7 not set: spurious */
132 			printk(KERN_WARNING PFX "spurious interrupt!\n");
133 			return IRQ_HANDLED;
134 		}
135 	}
136 
137 	/* Call the appropriate device's interrupt */
138 	generic_handle_irq(local_irq);
139 
140 	/* set EOI - forces a new interrupt if a lower priority device
141 	 * still needs service.
142 	 */
143 	outb((OCW2_SEOI|local_irq),IC_PIC1 + 0);
144 	return IRQ_HANDLED;
145 }
146 
147 /* Initialize Super I/O device */
148 static void
149 superio_init(struct pci_dev *pcidev)
150 {
151 	struct superio_device *sio = &sio_dev;
152 	struct pci_dev *pdev = sio->lio_pdev;
153 	u16 word;
154 	int ret;
155 
156 	if (sio->suckyio_irq_enabled)
157 		return;
158 
159 	BUG_ON(!pdev);
160 	BUG_ON(!sio->usb_pdev);
161 
162 	/* use the IRQ iosapic found for USB INT D... */
163 	pdev->irq = sio->usb_pdev->irq;
164 
165 	/* ...then properly fixup the USB to point at suckyio PIC */
166 	sio->usb_pdev->irq = superio_fixup_irq(sio->usb_pdev);
167 
168 	printk(KERN_INFO PFX "Found NS87560 Legacy I/O device at %s (IRQ %i)\n",
169 	       pci_name(pdev), pdev->irq);
170 
171 	pci_read_config_dword (pdev, SIO_SP1BAR, &sio->sp1_base);
172 	sio->sp1_base &= ~1;
173 	printk(KERN_INFO PFX "Serial port 1 at 0x%x\n", sio->sp1_base);
174 
175 	pci_read_config_dword (pdev, SIO_SP2BAR, &sio->sp2_base);
176 	sio->sp2_base &= ~1;
177 	printk(KERN_INFO PFX "Serial port 2 at 0x%x\n", sio->sp2_base);
178 
179 	pci_read_config_dword (pdev, SIO_PPBAR, &sio->pp_base);
180 	sio->pp_base &= ~1;
181 	printk(KERN_INFO PFX "Parallel port at 0x%x\n", sio->pp_base);
182 
183 	pci_read_config_dword (pdev, SIO_FDCBAR, &sio->fdc_base);
184 	sio->fdc_base &= ~1;
185 	printk(KERN_INFO PFX "Floppy controller at 0x%x\n", sio->fdc_base);
186 	pci_read_config_dword (pdev, SIO_ACPIBAR, &sio->acpi_base);
187 	sio->acpi_base &= ~1;
188 	printk(KERN_INFO PFX "ACPI at 0x%x\n", sio->acpi_base);
189 
190 	request_region (IC_PIC1, 0x1f, "pic1");
191 	request_region (IC_PIC2, 0x1f, "pic2");
192 	request_region (sio->acpi_base, 0x1f, "acpi");
193 
194 	/* Enable the legacy I/O function */
195 	pci_read_config_word (pdev, PCI_COMMAND, &word);
196 	word |= PCI_COMMAND_SERR | PCI_COMMAND_PARITY | PCI_COMMAND_IO;
197 	pci_write_config_word (pdev, PCI_COMMAND, word);
198 
199 	pci_set_master (pdev);
200 	ret = pci_enable_device(pdev);
201 	BUG_ON(ret < 0);	/* not too much we can do about this... */
202 
203 	/*
204 	 * Next project is programming the onboard interrupt controllers.
205 	 * PDC hasn't done this for us, since it's using polled I/O.
206 	 *
207 	 * XXX Use dword writes to avoid bugs in Elroy or Suckyio Config
208 	 *     space access.  PCI is by nature a 32-bit bus and config
209 	 *     space can be sensitive to that.
210 	 */
211 
212 	/* 0x64 - 0x67 :
213 		DMA Rtg 2
214 		DMA Rtg 3
215 		DMA Chan Ctl
216 		TRIGGER_1    == 0x82   USB & IDE level triggered, rest to edge
217 	*/
218 	pci_write_config_dword (pdev, 0x64,         0x82000000U);
219 
220 	/* 0x68 - 0x6b :
221 		TRIGGER_2    == 0x00   all edge triggered (not used)
222 		CFG_IR_SER   == 0x43   SerPort1 = IRQ3, SerPort2 = IRQ4
223 		CFG_IR_PF    == 0x65   ParPort  = IRQ5, FloppyCtlr = IRQ6
224 		CFG_IR_IDE   == 0x07   IDE1 = IRQ7, reserved
225 	*/
226 	pci_write_config_dword (pdev, TRIGGER_2,    0x07654300U);
227 
228 	/* 0x6c - 0x6f :
229 		CFG_IR_INTAB == 0x00
230 		CFG_IR_INTCD == 0x10   USB = IRQ1
231 		CFG_IR_PS2   == 0x00
232 		CFG_IR_FXBUS == 0x00
233 	*/
234 	pci_write_config_dword (pdev, CFG_IR_INTAB, 0x00001000U);
235 
236 	/* 0x70 - 0x73 :
237 		CFG_IR_USB   == 0x00  not used. USB is connected to INTD.
238 		CFG_IR_ACPI  == 0x00  not used.
239 		DMA Priority == 0x4c88  Power on default value. NFC.
240 	*/
241 	pci_write_config_dword (pdev, CFG_IR_USB, 0x4c880000U);
242 
243 	/* PIC1 Initialization Command Word register programming */
244 	outb (0x11,IC_PIC1+0);	/* ICW1: ICW4 write req | ICW1 */
245 	outb (0x00,IC_PIC1+1);	/* ICW2: interrupt vector table - not used */
246 	outb (0x04,IC_PIC1+1);	/* ICW3: Cascade */
247 	outb (0x01,IC_PIC1+1);	/* ICW4: x86 mode */
248 
249 	/* PIC1 Program Operational Control Words */
250 	outb (0xff,IC_PIC1+1);	/* OCW1: Mask all interrupts */
251 	outb (0xc2,IC_PIC1+0);  /* OCW2: priority (3-7,0-2) */
252 
253 	/* PIC2 Initialization Command Word register programming */
254 	outb (0x11,IC_PIC2+0);	/* ICW1: ICW4 write req | ICW1 */
255 	outb (0x00,IC_PIC2+1);	/* ICW2: N/A */
256 	outb (0x02,IC_PIC2+1);	/* ICW3: Slave ID code */
257 	outb (0x01,IC_PIC2+1);	/* ICW4: x86 mode */
258 
259 	/* Program Operational Control Words */
260 	outb (0xff,IC_PIC1+1);	/* OCW1: Mask all interrupts */
261 	outb (0x68,IC_PIC1+0);	/* OCW3: OCW3 select | ESMM | SMM */
262 
263 	/* Write master mask reg */
264 	outb (0xff,IC_PIC1+1);
265 
266 	/* Setup USB power regulation */
267 	outb(1, sio->acpi_base + USB_REG_CR);
268 	if (inb(sio->acpi_base + USB_REG_CR) & 1)
269 		printk(KERN_INFO PFX "USB regulator enabled\n");
270 	else
271 		printk(KERN_ERR PFX "USB regulator not initialized!\n");
272 
273 	if (request_irq(pdev->irq, superio_interrupt, 0,
274 			SUPERIO, (void *)sio)) {
275 
276 		printk(KERN_ERR PFX "could not get irq\n");
277 		BUG();
278 		return;
279 	}
280 
281 	sio->suckyio_irq_enabled = 1;
282 }
283 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87560_LIO, superio_init);
284 
285 static void superio_mask_irq(struct irq_data *d)
286 {
287 	unsigned int irq = d->irq;
288 	u8 r8;
289 
290 	if ((irq < 1) || (irq == 2) || (irq > 7)) {
291 		printk(KERN_ERR PFX "Illegal irq number.\n");
292 		BUG();
293 		return;
294 	}
295 
296 	/* Mask interrupt */
297 
298 	r8 = inb(IC_PIC1+1);
299 	r8 |= (1 << irq);
300 	outb (r8,IC_PIC1+1);
301 }
302 
303 static void superio_unmask_irq(struct irq_data *d)
304 {
305 	unsigned int irq = d->irq;
306 	u8 r8;
307 
308 	if ((irq < 1) || (irq == 2) || (irq > 7)) {
309 		printk(KERN_ERR PFX "Illegal irq number (%d).\n", irq);
310 		BUG();
311 		return;
312 	}
313 
314 	/* Unmask interrupt */
315 	r8 = inb(IC_PIC1+1);
316 	r8 &= ~(1 << irq);
317 	outb (r8,IC_PIC1+1);
318 }
319 
320 static struct irq_chip superio_interrupt_type = {
321 	.name		=	SUPERIO,
322 	.irq_unmask	=	superio_unmask_irq,
323 	.irq_mask	=	superio_mask_irq,
324 };
325 
326 #ifdef DEBUG_SUPERIO_INIT
327 static unsigned short expected_device[3] = {
328 	PCI_DEVICE_ID_NS_87415,
329 	PCI_DEVICE_ID_NS_87560_LIO,
330 	PCI_DEVICE_ID_NS_87560_USB
331 };
332 #endif
333 
334 int superio_fixup_irq(struct pci_dev *pcidev)
335 {
336 	int local_irq, i;
337 
338 #ifdef DEBUG_SUPERIO_INIT
339 	int fn;
340 	fn = PCI_FUNC(pcidev->devfn);
341 
342 	/* Verify the function number matches the expected device id. */
343 	if (expected_device[fn] != pcidev->device) {
344 		BUG();
345 		return -1;
346 	}
347 	printk(KERN_DEBUG "superio_fixup_irq(%s) ven 0x%x dev 0x%x from %ps\n",
348 		pci_name(pcidev),
349 		pcidev->vendor, pcidev->device,
350 		__builtin_return_address(0));
351 #endif
352 
353 	for (i = 0; i < 16; i++) {
354 		irq_set_chip_and_handler(i, &superio_interrupt_type,
355 					 handle_simple_irq);
356 	}
357 
358 	/*
359 	 * We don't allocate a SuperIO irq for the legacy IO function,
360 	 * since it is a "bridge". Instead, we will allocate irq's for
361 	 * each legacy device as they are initialized.
362 	 */
363 
364 	switch(pcidev->device) {
365 	case PCI_DEVICE_ID_NS_87415:		/* Function 0 */
366 		local_irq = IDE_IRQ;
367 		break;
368 	case PCI_DEVICE_ID_NS_87560_LIO:	/* Function 1 */
369 		sio_dev.lio_pdev = pcidev;	/* save for superio_init() */
370 		return -1;
371 	case PCI_DEVICE_ID_NS_87560_USB:	/* Function 2 */
372 		sio_dev.usb_pdev = pcidev;	/* save for superio_init() */
373 		local_irq = USB_IRQ;
374 		break;
375 	default:
376 		local_irq = -1;
377 		BUG();
378 		break;
379 	}
380 
381 	return local_irq;
382 }
383 
384 static void __init superio_serial_init(void)
385 {
386 #ifdef CONFIG_SERIAL_8250
387 	int retval;
388 	struct uart_port serial_port;
389 
390 	memset(&serial_port, 0, sizeof(serial_port));
391 	serial_port.iotype	= UPIO_PORT;
392 	serial_port.type	= PORT_16550A;
393 	serial_port.uartclk	= 115200*16;
394 	serial_port.flags	= UPF_FIXED_PORT | UPF_FIXED_TYPE |
395 				  UPF_BOOT_AUTOCONF;
396 
397 	/* serial port #1 */
398 	serial_port.iobase	= sio_dev.sp1_base;
399 	serial_port.irq		= SP1_IRQ;
400 	serial_port.line	= 0;
401 	retval = early_serial_setup(&serial_port);
402 	if (retval < 0) {
403 		printk(KERN_WARNING PFX "Register Serial #0 failed.\n");
404 		return;
405 	}
406 
407 	/* serial port #2 */
408 	serial_port.iobase	= sio_dev.sp2_base;
409 	serial_port.irq		= SP2_IRQ;
410 	serial_port.line	= 1;
411 	retval = early_serial_setup(&serial_port);
412 	if (retval < 0)
413 		printk(KERN_WARNING PFX "Register Serial #1 failed.\n");
414 #endif /* CONFIG_SERIAL_8250 */
415 }
416 
417 
418 static void __init superio_parport_init(void)
419 {
420 #ifdef CONFIG_PARPORT_PC
421 	if (!parport_pc_probe_port(sio_dev.pp_base,
422 			0 /*base_hi*/,
423 			PAR_IRQ,
424 			PARPORT_DMA_NONE /* dma */,
425 			NULL /*struct pci_dev* */,
426 			0 /* shared irq flags */))
427 
428 		printk(KERN_WARNING PFX "Probing parallel port failed.\n");
429 #endif	/* CONFIG_PARPORT_PC */
430 }
431 
432 
433 static void superio_fixup_pci(struct pci_dev *pdev)
434 {
435 	u8 prog;
436 
437 	pdev->class |= 0x5;
438 	pci_write_config_byte(pdev, PCI_CLASS_PROG, pdev->class);
439 
440 	pci_read_config_byte(pdev, PCI_CLASS_PROG, &prog);
441 	printk("PCI: Enabled native mode for NS87415 (pif=0x%x)\n", prog);
442 }
443 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87415, superio_fixup_pci);
444 
445 
446 static int __init
447 superio_probe(struct pci_dev *dev, const struct pci_device_id *id)
448 {
449 	struct superio_device *sio = &sio_dev;
450 
451 	/*
452 	** superio_probe(00:0e.0) ven 0x100b dev 0x2 sv 0x0 sd 0x0 class 0x1018a
453 	** superio_probe(00:0e.1) ven 0x100b dev 0xe sv 0x0 sd 0x0 class 0x68000
454 	** superio_probe(00:0e.2) ven 0x100b dev 0x12 sv 0x0 sd 0x0 class 0xc0310
455 	*/
456 	DBG_INIT("superio_probe(%s) ven 0x%x dev 0x%x sv 0x%x sd 0x%x class 0x%x\n",
457 		pci_name(dev),
458 		dev->vendor, dev->device,
459 		dev->subsystem_vendor, dev->subsystem_device,
460 		dev->class);
461 
462 	BUG_ON(!sio->suckyio_irq_enabled);	/* Enabled by PCI_FIXUP_FINAL */
463 
464 	if (dev->device == PCI_DEVICE_ID_NS_87560_LIO) {	/* Function 1 */
465 		superio_parport_init();
466 		superio_serial_init();
467 		/* REVISIT XXX : superio_fdc_init() ? */
468 		return 0;
469 	} else if (dev->device == PCI_DEVICE_ID_NS_87415) {	/* Function 0 */
470 		DBG_INIT("superio_probe: ignoring IDE 87415\n");
471 	} else if (dev->device == PCI_DEVICE_ID_NS_87560_USB) {	/* Function 2 */
472 		DBG_INIT("superio_probe: ignoring USB OHCI controller\n");
473 	} else {
474 		DBG_INIT("superio_probe: WTF? Fire Extinguisher?\n");
475 	}
476 
477 	/* Let appropriate other driver claim this device. */
478 	return -ENODEV;
479 }
480 
481 static const struct pci_device_id superio_tbl[] __initconst = {
482 	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87560_LIO) },
483 	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87560_USB) },
484 	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87415) },
485 	{ 0, }
486 };
487 
488 static struct pci_driver superio_driver __refdata = {
489 	.name =         SUPERIO,
490 	.id_table =     superio_tbl,
491 	.probe =        superio_probe,
492 };
493 
494 module_pci_driver(superio_driver);
495