summaryrefslogtreecommitdiff
path: root/arch/sh64/kernel/pci_sh5.c
blob: 9dae689b6a9b0da641a9283c3a7ad749dc9a28d3 (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
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
/*
 * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
 * Copyright (C) 2003, 2004 Paul Mundt
 * Copyright (C) 2004 Richard Curnow
 *
 * May be copied or modified under the terms of the GNU General Public
 * License.  See linux/COPYING for more information.
 *
 * Support functions for the SH5 PCI hardware.
 */

#include <linux/kernel.h>
#include <linux/rwsem.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/types.h>
#include <asm/pci.h>
#include <linux/irq.h>

#include <asm/io.h>
#include <asm/hardware.h>
#include "pci_sh5.h"

static unsigned long pcicr_virt;
unsigned long pciio_virt;

static void __init pci_fixup_ide_bases(struct pci_dev *d)
{
	int i;

	/*
	 * PCI IDE controllers use non-standard I/O port decoding, respect it.
	 */
	if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE)
		return;
	printk("PCI: IDE base address fixup for %s\n", pci_name(d));
	for(i=0; i<4; i++) {
		struct resource *r = &d->resource[i];
		if ((r->start & ~0x80) == 0x374) {
			r->start |= 2;
			r->end = r->start;
		}
	}
}
DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);

char * __init pcibios_setup(char *str)
{
	return str;
}

/* Rounds a number UP to the nearest power of two. Used for
 * sizing the PCI window.
 */
static u32 __init r2p2(u32 num)
{
	int i = 31;
	u32 tmp = num;

	if (num == 0)
		return 0;

	do {
		if (tmp & (1 << 31))
			break;
		i--;
		tmp <<= 1;
	} while (i >= 0);

	tmp = 1 << i;
	/* If the original number isn't a power of 2, round it up */
	if (tmp != num)
		tmp <<= 1;

	return tmp;
}

extern unsigned long long memory_start, memory_end;

int __init sh5pci_init(unsigned memStart, unsigned memSize)
{
	u32 lsr0;
	u32 uval;

	pcicr_virt = onchip_remap(SH5PCI_ICR_BASE, 1024, "PCICR");
	if (!pcicr_virt) {
		panic("Unable to remap PCICR\n");
	}

	pciio_virt = onchip_remap(SH5PCI_IO_BASE, 0x10000, "PCIIO");
	if (!pciio_virt) {
		panic("Unable to remap PCIIO\n");
	}

	pr_debug("Register base addres is 0x%08lx\n", pcicr_virt);

	/* Clear snoop registers */
        SH5PCI_WRITE(CSCR0, 0);
        SH5PCI_WRITE(CSCR1, 0);

	pr_debug("Wrote to reg\n");

        /* Switch off interrupts */
        SH5PCI_WRITE(INTM,  0);
        SH5PCI_WRITE(AINTM, 0);
        SH5PCI_WRITE(PINTM, 0);

        /* Set bus active, take it out of reset */
        uval = SH5PCI_READ(CR);

	/* Set command Register */
        SH5PCI_WRITE(CR, uval | CR_LOCK_MASK | CR_CFINT| CR_FTO | CR_PFE | CR_PFCS | CR_BMAM);

	uval=SH5PCI_READ(CR);
        pr_debug("CR is actually 0x%08x\n",uval);

        /* Allow it to be a master */
	/* NB - WE DISABLE I/O ACCESS to stop overlap */
        /* set WAIT bit to enable stepping, an attempt to improve stability */
	SH5PCI_WRITE_SHORT(CSR_CMD,
			    PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_WAIT);

        /*
        ** Set translation mapping memory in order to convert the address
        ** used for the main bus, to the PCI internal address.
        */
        SH5PCI_WRITE(MBR,0x40000000);

        /* Always set the max size 512M */
        SH5PCI_WRITE(MBMR, PCISH5_MEM_SIZCONV(512*1024*1024));

        /*
        ** I/O addresses are mapped at internal PCI specific address
        ** as is described into the configuration bridge table.
        ** These are changed to 0, to allow cards that have legacy
        ** io such as vga to function correctly. We set the SH5 IOBAR to
        ** 256K, which is a bit big as we can only have 64K of address space
        */

        SH5PCI_WRITE(IOBR,0x0);

	pr_debug("PCI:Writing 0x%08x to IOBR\n",0);

        /* Set up a 256K window. Totally pointless waste  of address space */
        SH5PCI_WRITE(IOBMR,0);
	pr_debug("PCI:Writing 0x%08x to IOBMR\n",0);

	/* The SH5 has a HUGE 256K I/O region, which breaks the PCI spec. Ideally,
         * we would want to map the I/O region somewhere, but it is so big this is not
         * that easy!
         */
	SH5PCI_WRITE(CSR_IBAR0,~0);
	/* Set memory size value */
        memSize = memory_end - memory_start;

        /* Now we set up the mbars so the PCI bus can see the memory of the machine */
        if (memSize < (1024 * 1024)) {
                printk(KERN_ERR "PCISH5: Ridiculous memory size of 0x%x?\n", memSize);
                return -EINVAL;
        }

        /* Set LSR 0 */
        lsr0 = (memSize > (512 * 1024 * 1024)) ? 0x1ff00001 : ((r2p2(memSize) - 0x100000) | 0x1);
        SH5PCI_WRITE(LSR0, lsr0);

	pr_debug("PCI:Writing 0x%08x to LSR0\n",lsr0);

        /* Set MBAR 0 */
        SH5PCI_WRITE(CSR_MBAR0, memory_start);
        SH5PCI_WRITE(LAR0, memory_start);

        SH5PCI_WRITE(CSR_MBAR1,0);
        SH5PCI_WRITE(LAR1,0);
        SH5PCI_WRITE(LSR1,0);

	pr_debug("PCI:Writing 0x%08llx to CSR_MBAR0\n",memory_start);
	pr_debug("PCI:Writing 0x%08llx to LAR0\n",memory_start);

        /* Enable the PCI interrupts on the device */
        SH5PCI_WRITE(INTM,  ~0);
        SH5PCI_WRITE(AINTM, ~0);
        SH5PCI_WRITE(PINTM, ~0);

	pr_debug("Switching on all error interrupts\n");

        return(0);
}

static int sh5pci_read(struct pci_bus *bus, unsigned int devfn, int where,
			int size, u32 *val)
{
	SH5PCI_WRITE(PAR, CONFIG_CMD(bus, devfn, where));

	switch (size) {
		case 1:
			*val = (u8)SH5PCI_READ_BYTE(PDR + (where & 3));
			break;
		case 2:
			*val = (u16)SH5PCI_READ_SHORT(PDR + (where & 2));
			break;
		case 4:
			*val = SH5PCI_READ(PDR);
			break;
	}

	return PCIBIOS_SUCCESSFUL;
}

static int sh5pci_write(struct pci_bus *bus, unsigned int devfn, int where,
			 int size, u32 val)
{
	SH5PCI_WRITE(PAR, CONFIG_CMD(bus, devfn, where));

	switch (size) {
		case 1:
			SH5PCI_WRITE_BYTE(PDR + (where & 3), (u8)val);
			break;
		case 2:
			SH5PCI_WRITE_SHORT(PDR + (where & 2), (u16)val);
			break;
		case 4:
			SH5PCI_WRITE(PDR, val);
			break;
	}

	return PCIBIOS_SUCCESSFUL;
}

static struct pci_ops pci_config_ops = {
	.read =		sh5pci_read,
	.write =	sh5pci_write,
};

/* Everything hangs off this */
static struct pci_bus *pci_root_bus;


static u8 __init no_swizzle(struct pci_dev *dev, u8 * pin)
{
	pr_debug("swizzle for dev %d on bus %d slot %d pin is %d\n",
	         dev->devfn,dev->bus->number, PCI_SLOT(dev->devfn),*pin);
	return PCI_SLOT(dev->devfn);
}

static inline u8 bridge_swizzle(u8 pin, u8 slot)
{
	return (((pin-1) + slot) % 4) + 1;
}

u8 __init common_swizzle(struct pci_dev *dev, u8 *pinp)
{
	if (dev->bus->number != 0) {
		u8 pin = *pinp;
		do {
			pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
			/* Move up the chain of bridges. */
			dev = dev->bus->self;
		} while (dev->bus->self);
		*pinp = pin;

		/* The slot is the slot of the last bridge. */
	}

	return PCI_SLOT(dev->devfn);
}

/* This needs to be shunted out of here into the board specific bit */

static int __init map_cayman_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
	int result = -1;

	/* The complication here is that the PCI IRQ lines from the Cayman's 2
	   5V slots get into the CPU via a different path from the IRQ lines
	   from the 3 3.3V slots.  Thus, we have to detect whether the card's
	   interrupts go via the 5V or 3.3V path, i.e. the 'bridge swizzling'
	   at the point where we cross from 5V to 3.3V is not the normal case.

	   The added complication is that we don't know that the 5V slots are
	   always bus 2, because a card containing a PCI-PCI bridge may be
	   plugged into a 3.3V slot, and this changes the bus numbering.

	   Also, the Cayman has an intermediate PCI bus that goes a custom
	   expansion board header (and to the secondary bridge).  This bus has
	   never been used in practice.

	   The 1ary onboard PCI-PCI bridge is device 3 on bus 0
	   The 2ary onboard PCI-PCI bridge is device 0 on the 2ary bus of the 1ary bridge.
	   */

	struct slot_pin {
		int slot;
		int pin;
	} path[4];
	int i=0;

	while (dev->bus->number > 0) {

		slot = path[i].slot = PCI_SLOT(dev->devfn);
		pin = path[i].pin = bridge_swizzle(pin, slot);
		dev = dev->bus->self;
		i++;
		if (i > 3) panic("PCI path to root bus too long!\n");
	}

	slot = PCI_SLOT(dev->devfn);
	/* This is the slot on bus 0 through which the device is eventually
	   reachable. */

	/* Now work back up. */
	if ((slot < 3) || (i == 0)) {
		/* Bus 0 (incl. PCI-PCI bridge itself) : perform the final
		   swizzle now. */
		result = IRQ_INTA + bridge_swizzle(pin, slot) - 1;
	} else {
		i--;
		slot = path[i].slot;
		pin  = path[i].pin;
		if (slot > 0) {
			panic("PCI expansion bus device found - not handled!\n");
		} else {
			if (i > 0) {
				/* 5V slots */
				i--;
				slot = path[i].slot;
				pin  = path[i].pin;
				/* 'pin' was swizzled earlier wrt slot, don't do it again. */
				result = IRQ_P2INTA + (pin - 1);
			} else {
				/* IRQ for 2ary PCI-PCI bridge : unused */
				result = -1;
			}
		}
	}

	return result;
}

irqreturn_t pcish5_err_irq(int irq, void *dev_id, struct pt_regs *regs)
{
	unsigned pci_int, pci_air, pci_cir, pci_aint;

	pci_int = SH5PCI_READ(INT);
	pci_cir = SH5PCI_READ(CIR);
	pci_air = SH5PCI_READ(AIR);

	if (pci_int) {
		printk("PCI INTERRUPT (at %08llx)!\n", regs->pc);
		printk("PCI INT -> 0x%x\n", pci_int & 0xffff);
		printk("PCI AIR -> 0x%x\n", pci_air);
		printk("PCI CIR -> 0x%x\n", pci_cir);
		SH5PCI_WRITE(INT, ~0);
	}

	pci_aint = SH5PCI_READ(AINT);
	if (pci_aint) {
		printk("PCI ARB INTERRUPT!\n");
		printk("PCI AINT -> 0x%x\n", pci_aint);
		printk("PCI AIR -> 0x%x\n", pci_air);
		printk("PCI CIR -> 0x%x\n", pci_cir);
		SH5PCI_WRITE(AINT, ~0);
	}

	return IRQ_HANDLED;
}

irqreturn_t pcish5_serr_irq(int irq, void *dev_id, struct pt_regs *regs)
{
	printk("SERR IRQ\n");

	return IRQ_NONE;
}

#define ROUND_UP(x, a)		(((x) + (a) - 1) & ~((a) - 1))

static void __init
pcibios_size_bridge(struct pci_bus *bus, struct resource *ior,
		    struct resource *memr)
{
	struct resource io_res, mem_res;
	struct pci_dev *dev;
	struct pci_dev *bridge = bus->self;
	struct list_head *ln;

	if (!bridge)
		return;	/* host bridge, nothing to do */

	/* set reasonable default locations for pcibios_align_resource */
	io_res.start = PCIBIOS_MIN_IO;
	mem_res.start = PCIBIOS_MIN_MEM;

	io_res.end = io_res.start;
	mem_res.end = mem_res.start;

	/* Collect information about how our direct children are layed out. */
	for (ln=bus->devices.next; ln != &bus->devices; ln=ln->next) {
		int i;
		dev = pci_dev_b(ln);

		/* Skip bridges for now */
		if (dev->class >> 8 == PCI_CLASS_BRIDGE_PCI)
			continue;

		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
			struct resource res;
			unsigned long size;

			memcpy(&res, &dev->resource[i], sizeof(res));
			size = res.end - res.start + 1;

			if (res.flags & IORESOURCE_IO) {
				res.start = io_res.end;
				pcibios_align_resource(dev, &res, size, 0);
				io_res.end = res.start + size;
			} else if (res.flags & IORESOURCE_MEM) {
				res.start = mem_res.end;
				pcibios_align_resource(dev, &res, size, 0);
				mem_res.end = res.start + size;
			}
		}
	}

	/* And for all of the subordinate busses. */
	for (ln=bus->children.next; ln != &bus->children; ln=ln->next)
		pcibios_size_bridge(pci_bus_b(ln), &io_res, &mem_res);

	/* turn the ending locations into sizes (subtract start) */
	io_res.end -= io_res.start;
	mem_res.end -= mem_res.start;

	/* Align the sizes up by bridge rules */
	io_res.end = ROUND_UP(io_res.end, 4*1024) - 1;
	mem_res.end = ROUND_UP(mem_res.end, 1*1024*1024) - 1;

	/* Adjust the bridge's allocation requirements */
	bridge->resource[0].end = bridge->resource[0].start + io_res.end;
	bridge->resource[1].end = bridge->resource[1].start + mem_res.end;

	bridge->resource[PCI_BRIDGE_RESOURCES].end =
	    bridge->resource[PCI_BRIDGE_RESOURCES].start + io_res.end;
	bridge->resource[PCI_BRIDGE_RESOURCES+1].end =
	    bridge->resource[PCI_BRIDGE_RESOURCES+1].start + mem_res.end;

	/* adjust parent's resource requirements */
	if (ior) {
		ior->end = ROUND_UP(ior->end, 4*1024);
		ior->end += io_res.end;
	}

	if (memr) {
		memr->end = ROUND_UP(memr->end, 1*1024*1024);
		memr->end += mem_res.end;
	}
}

#undef ROUND_UP

static void __init pcibios_size_bridges(void)
{
	struct resource io_res, mem_res;

	memset(&io_res, 0, sizeof(io_res));
	memset(&mem_res, 0, sizeof(mem_res));

	pcibios_size_bridge(pci_root_bus, &io_res, &mem_res);
}

static int __init pcibios_init(void)
{
        if (request_irq(IRQ_ERR, pcish5_err_irq,
                        IRQF_DISABLED, "PCI Error",NULL) < 0) {
                printk(KERN_ERR "PCISH5: Cannot hook PCI_PERR interrupt\n");
                return -EINVAL;
        }

        if (request_irq(IRQ_SERR, pcish5_serr_irq,
                        IRQF_DISABLED, "PCI SERR interrupt", NULL) < 0) {
                printk(KERN_ERR "PCISH5: Cannot hook PCI_SERR interrupt\n");
                return -EINVAL;
        }

	/* The pci subsytem needs to know where memory is and how much
	 * of it there is. I've simply made these globals. A better mechanism
	 * is probably needed.
	 */
	sh5pci_init(__pa(memory_start),
		     __pa(memory_end) - __pa(memory_start));

	pci_root_bus = pci_scan_bus(0, &pci_config_ops, NULL);
	pcibios_size_bridges();
	pci_assign_unassigned_resources();
	pci_fixup_irqs(no_swizzle, map_cayman_irq);

	return 0;
}

subsys_initcall(pcibios_init);

void __init pcibios_fixup_bus(struct pci_bus *bus)
{
	struct pci_dev *dev = bus->self;
	int i;

#if 1
	if(dev) {
		for(i=0; i<3; i++) {
			bus->resource[i] =
				&dev->resource[PCI_BRIDGE_RESOURCES+i];
			bus->resource[i]->name = bus->name;
		}
		bus->resource[0]->flags |= IORESOURCE_IO;
		bus->resource[1]->flags |= IORESOURCE_MEM;

		/* For now, propagate host limits to the bus;
		 * we'll adjust them later. */

#if 1
		bus->resource[0]->end = 64*1024 - 1 ;
		bus->resource[1]->end = PCIBIOS_MIN_MEM+(256*1024*1024)-1;
		bus->resource[0]->start = PCIBIOS_MIN_IO;
		bus->resource[1]->start = PCIBIOS_MIN_MEM;
#else
		bus->resource[0]->end = 0
		bus->resource[1]->end = 0
		bus->resource[0]->start =0
		  bus->resource[1]->start = 0;
#endif
		/* Turn off downstream PF memory address range by default */
		bus->resource[2]->start = 1024*1024;
		bus->resource[2]->end = bus->resource[2]->start - 1;
	}
#endif

}