summaryrefslogtreecommitdiffstats
path: root/kernel/arch/powerpc/platforms/52xx/mpc52xx_pci.c
blob: 6eb3b2abae9088a653705010741cff60b90261a2 (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
/*
 * PCI code for the Freescale MPC52xx embedded CPU.
 *
 * Copyright (C) 2006 Secret Lab Technologies Ltd.
 *                        Grant Likely <grant.likely@secretlab.ca>
 * Copyright (C) 2004 Sylvain Munaut <tnt@246tNt.com>
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#undef DEBUG

#include <linux/pci.h>
#include <asm/mpc52xx.h>
#include <asm/delay.h>
#include <asm/machdep.h>
#include <linux/kernel.h>


/* ======================================================================== */
/* Structures mapping & Defines for PCI Unit                                */
/* ======================================================================== */

#define MPC52xx_PCI_GSCR_BM		0x40000000
#define MPC52xx_PCI_GSCR_PE		0x20000000
#define MPC52xx_PCI_GSCR_SE		0x10000000
#define MPC52xx_PCI_GSCR_XLB2PCI_MASK	0x07000000
#define MPC52xx_PCI_GSCR_XLB2PCI_SHIFT	24
#define MPC52xx_PCI_GSCR_IPG2PCI_MASK	0x00070000
#define MPC52xx_PCI_GSCR_IPG2PCI_SHIFT	16
#define MPC52xx_PCI_GSCR_BME		0x00004000
#define MPC52xx_PCI_GSCR_PEE		0x00002000
#define MPC52xx_PCI_GSCR_SEE		0x00001000
#define MPC52xx_PCI_GSCR_PR		0x00000001


#define MPC52xx_PCI_IWBTAR_TRANSLATION(proc_ad,pci_ad,size)	  \
		( ( (proc_ad) & 0xff000000 )			| \
		  ( (((size) - 1) >> 8) & 0x00ff0000 )		| \
		  ( ((pci_ad) >> 16) & 0x0000ff00 ) )

#define MPC52xx_PCI_IWCR_PACK(win0,win1,win2)	(((win0) << 24) | \
						 ((win1) << 16) | \
						 ((win2) <<  8))

#define MPC52xx_PCI_IWCR_DISABLE	0x0
#define MPC52xx_PCI_IWCR_ENABLE		0x1
#define MPC52xx_PCI_IWCR_READ		0x0
#define MPC52xx_PCI_IWCR_READ_LINE	0x2
#define MPC52xx_PCI_IWCR_READ_MULTI	0x4
#define MPC52xx_PCI_IWCR_MEM		0x0
#define MPC52xx_PCI_IWCR_IO		0x8

#define MPC52xx_PCI_TCR_P		0x01000000
#define MPC52xx_PCI_TCR_LD		0x00010000
#define MPC52xx_PCI_TCR_WCT8		0x00000008

#define MPC52xx_PCI_TBATR_DISABLE	0x0
#define MPC52xx_PCI_TBATR_ENABLE	0x1

struct mpc52xx_pci {
	u32	idr;		/* PCI + 0x00 */
	u32	scr;		/* PCI + 0x04 */
	u32	ccrir;		/* PCI + 0x08 */
	u32	cr1;		/* PCI + 0x0C */
	u32	bar0;		/* PCI + 0x10 */
	u32	bar1;		/* PCI + 0x14 */
	u8	reserved1[16];	/* PCI + 0x18 */
	u32	ccpr;		/* PCI + 0x28 */
	u32	sid;		/* PCI + 0x2C */
	u32	erbar;		/* PCI + 0x30 */
	u32	cpr;		/* PCI + 0x34 */
	u8	reserved2[4];	/* PCI + 0x38 */
	u32	cr2;		/* PCI + 0x3C */
	u8	reserved3[32];	/* PCI + 0x40 */
	u32	gscr;		/* PCI + 0x60 */
	u32	tbatr0;		/* PCI + 0x64 */
	u32	tbatr1;		/* PCI + 0x68 */
	u32	tcr;		/* PCI + 0x6C */
	u32	iw0btar;	/* PCI + 0x70 */
	u32	iw1btar;	/* PCI + 0x74 */
	u32	iw2btar;	/* PCI + 0x78 */
	u8	reserved4[4];	/* PCI + 0x7C */
	u32	iwcr;		/* PCI + 0x80 */
	u32	icr;		/* PCI + 0x84 */
	u32	isr;		/* PCI + 0x88 */
	u32	arb;		/* PCI + 0x8C */
	u8	reserved5[104];	/* PCI + 0x90 */
	u32	car;		/* PCI + 0xF8 */
	u8	reserved6[4];	/* PCI + 0xFC */
};

/* MPC5200 device tree match tables */
const struct of_device_id mpc52xx_pci_ids[] __initconst = {
	{ .type = "pci", .compatible = "fsl,mpc5200-pci", },
	{ .type = "pci", .compatible = "mpc5200-pci", },
	{}
};

/* ======================================================================== */
/* PCI configuration access                                                 */
/* ======================================================================== */

static int
mpc52xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
				int offset, int len, u32 *val)
{
	struct pci_controller *hose = pci_bus_to_host(bus);
	u32 value;

	if (ppc_md.pci_exclude_device)
		if (ppc_md.pci_exclude_device(hose, bus->number, devfn))
			return PCIBIOS_DEVICE_NOT_FOUND;

	out_be32(hose->cfg_addr,
		(1 << 31) |
		(bus->number << 16) |
		(devfn << 8) |
		(offset & 0xfc));
	mb();

#if defined(CONFIG_PPC_MPC5200_BUGFIX)
	if (bus->number) {
		/* workaround for the bug 435 of the MPC5200 (L25R);
		 * Don't do 32 bits config access during type-1 cycles */
		switch (len) {
		      case 1:
			value = in_8(((u8 __iomem *)hose->cfg_data) +
			             (offset & 3));
			break;
		      case 2:
			value = in_le16(((u16 __iomem *)hose->cfg_data) +
			                ((offset>>1) & 1));
			break;

		      default:
			value = in_le16((u16 __iomem *)hose->cfg_data) |
				(in_le16(((u16 __iomem *)hose->cfg_data) + 1) << 16);
			break;
		}
	}
	else
#endif
	{
		value = in_le32(hose->cfg_data);

		if (len != 4) {
			value >>= ((offset & 0x3) << 3);
			value &= 0xffffffff >> (32 - (len << 3));
		}
	}

	*val = value;

	out_be32(hose->cfg_addr, 0);
	mb();

	return PCIBIOS_SUCCESSFUL;
}

static int
mpc52xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
				int offset, int len, u32 val)
{
	struct pci_controller *hose = pci_bus_to_host(bus);
	u32 value, mask;

	if (ppc_md.pci_exclude_device)
		if (ppc_md.pci_exclude_device(hose, bus->number, devfn))
			return PCIBIOS_DEVICE_NOT_FOUND;

	out_be32(hose->cfg_addr,
		(1 << 31) |
		(bus->number << 16) |
		(devfn << 8) |
		(offset & 0xfc));
	mb();

#if defined(CONFIG_PPC_MPC5200_BUGFIX)
	if (bus->number) {
		/* workaround for the bug 435 of the MPC5200 (L25R);
		 * Don't do 32 bits config access during type-1 cycles */
		switch (len) {
		      case 1:
			out_8(((u8 __iomem *)hose->cfg_data) +
				(offset & 3), val);
			break;
		      case 2:
			out_le16(((u16 __iomem *)hose->cfg_data) +
				((offset>>1) & 1), val);
			break;

		      default:
			out_le16((u16 __iomem *)hose->cfg_data,
				(u16)val);
			out_le16(((u16 __iomem *)hose->cfg_data) + 1,
				(u16)(val>>16));
			break;
		}
	}
	else
#endif
	{
		if (len != 4) {
			value = in_le32(hose->cfg_data);

			offset = (offset & 0x3) << 3;
			mask = (0xffffffff >> (32 - (len << 3)));
			mask <<= offset;

			value &= ~mask;
			val = value | ((val << offset) & mask);
		}

		out_le32(hose->cfg_data, val);
	}
	mb();

	out_be32(hose->cfg_addr, 0);
	mb();

	return PCIBIOS_SUCCESSFUL;
}

static struct pci_ops mpc52xx_pci_ops = {
	.read  = mpc52xx_pci_read_config,
	.write = mpc52xx_pci_write_config
};


/* ======================================================================== */
/* PCI setup                                                                */
/* ======================================================================== */

static void __init
mpc52xx_pci_setup(struct pci_controller *hose,
                  struct mpc52xx_pci __iomem *pci_regs, phys_addr_t pci_phys)
{
	struct resource *res;
	u32 tmp;
	int iwcr0 = 0, iwcr1 = 0, iwcr2 = 0;

	pr_debug("mpc52xx_pci_setup(hose=%p, pci_regs=%p)\n", hose, pci_regs);

	/* pci_process_bridge_OF_ranges() found all our addresses for us;
	 * now store them in the right places */
	hose->cfg_addr = &pci_regs->car;
	hose->cfg_data = hose->io_base_virt;

	/* Control regs */
	tmp = in_be32(&pci_regs->scr);
	tmp |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
	out_be32(&pci_regs->scr, tmp);

	/* Memory windows */
	res = &hose->mem_resources[0];
	if (res->flags) {
		pr_debug("mem_resource[0] = "
		         "{.start=%llx, .end=%llx, .flags=%llx}\n",
		         (unsigned long long)res->start,
			 (unsigned long long)res->end,
			 (unsigned long long)res->flags);
		out_be32(&pci_regs->iw0btar,
		         MPC52xx_PCI_IWBTAR_TRANSLATION(res->start, res->start,
							resource_size(res)));
		iwcr0 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_MEM;
		if (res->flags & IORESOURCE_PREFETCH)
			iwcr0 |= MPC52xx_PCI_IWCR_READ_MULTI;
		else
			iwcr0 |= MPC52xx_PCI_IWCR_READ;
	}

	res = &hose->mem_resources[1];
	if (res->flags) {
		pr_debug("mem_resource[1] = {.start=%x, .end=%x, .flags=%lx}\n",
		         res->start, res->end, res->flags);
		out_be32(&pci_regs->iw1btar,
		         MPC52xx_PCI_IWBTAR_TRANSLATION(res->start, res->start,
							resource_size(res)));
		iwcr1 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_MEM;
		if (res->flags & IORESOURCE_PREFETCH)
			iwcr1 |= MPC52xx_PCI_IWCR_READ_MULTI;
		else
			iwcr1 |= MPC52xx_PCI_IWCR_READ;
	}

	/* IO resources */
	res = &hose->io_resource;
	if (!res) {
		printk(KERN_ERR "%s: Didn't find IO resources\n", __FILE__);
		return;
	}
	pr_debug(".io_resource={.start=%llx,.end=%llx,.flags=%llx} "
	         ".io_base_phys=0x%p\n",
	         (unsigned long long)res->start,
		 (unsigned long long)res->end,
		 (unsigned long long)res->flags, (void*)hose->io_base_phys);
	out_be32(&pci_regs->iw2btar,
	         MPC52xx_PCI_IWBTAR_TRANSLATION(hose->io_base_phys,
	                                        res->start,
						resource_size(res)));
	iwcr2 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_IO;

	/* Set all the IWCR fields at once; they're in the same reg */
	out_be32(&pci_regs->iwcr, MPC52xx_PCI_IWCR_PACK(iwcr0, iwcr1, iwcr2));

	/* Map IMMR onto PCI bus */
	pci_phys &= 0xfffc0000; /* bar0 has only 14 significant bits */
	out_be32(&pci_regs->tbatr0, MPC52xx_PCI_TBATR_ENABLE | pci_phys);
	out_be32(&pci_regs->bar0, PCI_BASE_ADDRESS_MEM_PREFETCH | pci_phys);

	/* Map memory onto PCI bus */
	out_be32(&pci_regs->tbatr1, MPC52xx_PCI_TBATR_ENABLE);
	out_be32(&pci_regs->bar1, PCI_BASE_ADDRESS_MEM_PREFETCH);

	out_be32(&pci_regs->tcr, MPC52xx_PCI_TCR_LD | MPC52xx_PCI_TCR_WCT8);

	tmp = in_be32(&pci_regs->gscr);
#if 0
	/* Reset the exteral bus ( internal PCI controller is NOT resetted ) */
	/* Not necessary and can be a bad thing if for example the bootloader
	   is displaying a splash screen or ... Just left here for
	   documentation purpose if anyone need it */
	out_be32(&pci_regs->gscr, tmp | MPC52xx_PCI_GSCR_PR);
	udelay(50);
#endif

	/* Make sure the PCI bridge is out of reset */
	out_be32(&pci_regs->gscr, tmp & ~MPC52xx_PCI_GSCR_PR);
}

static void
mpc52xx_pci_fixup_resources(struct pci_dev *dev)
{
	int i;

	pr_debug("mpc52xx_pci_fixup_resources() %.4x:%.4x\n",
	         dev->vendor, dev->device);

	/* We don't rely on boot loader for PCI and resets all
	   devices */
	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
		struct resource *res = &dev->resource[i];
		if (res->end > res->start) {	/* Only valid resources */
			res->end -= res->start;
			res->start = 0;
			res->flags |= IORESOURCE_UNSET;
		}
	}

	/* The PCI Host bridge of MPC52xx has a prefetch memory resource
	   fixed to 1Gb. Doesn't fit in the resource system so we remove it */
	if ( (dev->vendor == PCI_VENDOR_ID_MOTOROLA) &&
	     (   dev->device == PCI_DEVICE_ID_MOTOROLA_MPC5200
	      || dev->device == PCI_DEVICE_ID_MOTOROLA_MPC5200B) ) {
		struct resource *res = &dev->resource[1];
		res->start = res->end = res->flags = 0;
	}
}

int __init
mpc52xx_add_bridge(struct device_node *node)
{
	int len;
	struct mpc52xx_pci __iomem *pci_regs;
	struct pci_controller *hose;
	const int *bus_range;
	struct resource rsrc;

	pr_debug("Adding MPC52xx PCI host bridge %s\n", node->full_name);

	pci_add_flags(PCI_REASSIGN_ALL_BUS);

	if (of_address_to_resource(node, 0, &rsrc) != 0) {
		printk(KERN_ERR "Can't get %s resources\n", node->full_name);
		return -EINVAL;
	}

	bus_range = of_get_property(node, "bus-range", &len);
	if (bus_range == NULL || len < 2 * sizeof(int)) {
		printk(KERN_WARNING "Can't get %s bus-range, assume bus 0\n",
		       node->full_name);
		bus_range = NULL;
	}

	/* There are some PCI quirks on the 52xx, register the hook to
	 * fix them. */
	ppc_md.pcibios_fixup_resources = mpc52xx_pci_fixup_resources;

	/* Alloc and initialize the pci controller.  Values in the device
	 * tree are needed to configure the 52xx PCI controller.  Rather
	 * than parse the tree here, let pci_process_bridge_OF_ranges()
	 * do it for us and extract the values after the fact */
	hose = pcibios_alloc_controller(node);
	if (!hose)
		return -ENOMEM;

	hose->first_busno = bus_range ? bus_range[0] : 0;
	hose->last_busno = bus_range ? bus_range[1] : 0xff;

	hose->ops = &mpc52xx_pci_ops;

	pci_regs = ioremap(rsrc.start, resource_size(&rsrc));
	if (!pci_regs)
		return -ENOMEM;

	pci_process_bridge_OF_ranges(hose, node, 1);

	/* Finish setting up PCI using values obtained by
	 * pci_proces_bridge_OF_ranges */
	mpc52xx_pci_setup(hose, pci_regs, rsrc.start);

	return 0;
}

void __init mpc52xx_setup_pci(void)
{
	struct device_node *pci;

	pci = of_find_matching_node(NULL, mpc52xx_pci_ids);
	if (!pci)
		return;

	mpc52xx_add_bridge(pci);
	of_node_put(pci);
}