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Merge tag 'drm-intel-fixes-2013-07-11' of git://people.freedesktop.org/~danvet/drm...
[deliverable/linux.git] / arch / arm / mach-integrator / pci_v3.c
1 /*
2 * linux/arch/arm/mach-integrator/pci_v3.c
3 *
4 * PCI functions for V3 host PCI bridge
5 *
6 * Copyright (C) 1999 ARM Limited
7 * Copyright (C) 2000-2001 Deep Blue Solutions Ltd
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23 #include <linux/kernel.h>
24 #include <linux/pci.h>
25 #include <linux/ioport.h>
26 #include <linux/interrupt.h>
27 #include <linux/spinlock.h>
28 #include <linux/init.h>
29 #include <linux/io.h>
30 #include <linux/platform_device.h>
31 #include <linux/of.h>
32 #include <linux/of_address.h>
33 #include <linux/of_irq.h>
34 #include <linux/of_pci.h>
35 #include <video/vga.h>
36
37 #include <mach/hardware.h>
38 #include <mach/platform.h>
39 #include <mach/irqs.h>
40
41 #include <asm/mach/map.h>
42 #include <asm/signal.h>
43 #include <asm/mach/pci.h>
44 #include <asm/irq_regs.h>
45
46 #include "pci_v3.h"
47
48 /*
49 * Where in the memory map does PCI live?
50 *
51 * This represents a fairly liberal usage of address space. Even though
52 * the V3 only has two windows (therefore we need to map stuff on the fly),
53 * we maintain the same addresses, even if they're not mapped.
54 */
55 #define PHYS_PCI_MEM_BASE 0x40000000 /* 256M */
56 #define PHYS_PCI_PRE_BASE 0x50000000 /* 256M */
57 #define PHYS_PCI_IO_BASE 0x60000000 /* 16M */
58 #define PHYS_PCI_CONFIG_BASE 0x61000000 /* 16M */
59 #define PHYS_PCI_V3_BASE 0x62000000 /* 64K */
60
61 #define PCI_MEMORY_VADDR IOMEM(0xe8000000)
62 #define PCI_CONFIG_VADDR IOMEM(0xec000000)
63
64 /*
65 * V3 Local Bus to PCI Bridge definitions
66 *
67 * Registers (these are taken from page 129 of the EPC User's Manual Rev 1.04
68 * All V3 register names are prefaced by V3_ to avoid clashing with any other
69 * PCI definitions. Their names match the user's manual.
70 *
71 * I'm assuming that I20 is disabled.
72 *
73 */
74 #define V3_PCI_VENDOR 0x00000000
75 #define V3_PCI_DEVICE 0x00000002
76 #define V3_PCI_CMD 0x00000004
77 #define V3_PCI_STAT 0x00000006
78 #define V3_PCI_CC_REV 0x00000008
79 #define V3_PCI_HDR_CFG 0x0000000C
80 #define V3_PCI_IO_BASE 0x00000010
81 #define V3_PCI_BASE0 0x00000014
82 #define V3_PCI_BASE1 0x00000018
83 #define V3_PCI_SUB_VENDOR 0x0000002C
84 #define V3_PCI_SUB_ID 0x0000002E
85 #define V3_PCI_ROM 0x00000030
86 #define V3_PCI_BPARAM 0x0000003C
87 #define V3_PCI_MAP0 0x00000040
88 #define V3_PCI_MAP1 0x00000044
89 #define V3_PCI_INT_STAT 0x00000048
90 #define V3_PCI_INT_CFG 0x0000004C
91 #define V3_LB_BASE0 0x00000054
92 #define V3_LB_BASE1 0x00000058
93 #define V3_LB_MAP0 0x0000005E
94 #define V3_LB_MAP1 0x00000062
95 #define V3_LB_BASE2 0x00000064
96 #define V3_LB_MAP2 0x00000066
97 #define V3_LB_SIZE 0x00000068
98 #define V3_LB_IO_BASE 0x0000006E
99 #define V3_FIFO_CFG 0x00000070
100 #define V3_FIFO_PRIORITY 0x00000072
101 #define V3_FIFO_STAT 0x00000074
102 #define V3_LB_ISTAT 0x00000076
103 #define V3_LB_IMASK 0x00000077
104 #define V3_SYSTEM 0x00000078
105 #define V3_LB_CFG 0x0000007A
106 #define V3_PCI_CFG 0x0000007C
107 #define V3_DMA_PCI_ADR0 0x00000080
108 #define V3_DMA_PCI_ADR1 0x00000090
109 #define V3_DMA_LOCAL_ADR0 0x00000084
110 #define V3_DMA_LOCAL_ADR1 0x00000094
111 #define V3_DMA_LENGTH0 0x00000088
112 #define V3_DMA_LENGTH1 0x00000098
113 #define V3_DMA_CSR0 0x0000008B
114 #define V3_DMA_CSR1 0x0000009B
115 #define V3_DMA_CTLB_ADR0 0x0000008C
116 #define V3_DMA_CTLB_ADR1 0x0000009C
117 #define V3_DMA_DELAY 0x000000E0
118 #define V3_MAIL_DATA 0x000000C0
119 #define V3_PCI_MAIL_IEWR 0x000000D0
120 #define V3_PCI_MAIL_IERD 0x000000D2
121 #define V3_LB_MAIL_IEWR 0x000000D4
122 #define V3_LB_MAIL_IERD 0x000000D6
123 #define V3_MAIL_WR_STAT 0x000000D8
124 #define V3_MAIL_RD_STAT 0x000000DA
125 #define V3_QBA_MAP 0x000000DC
126
127 /* PCI COMMAND REGISTER bits
128 */
129 #define V3_COMMAND_M_FBB_EN (1 << 9)
130 #define V3_COMMAND_M_SERR_EN (1 << 8)
131 #define V3_COMMAND_M_PAR_EN (1 << 6)
132 #define V3_COMMAND_M_MASTER_EN (1 << 2)
133 #define V3_COMMAND_M_MEM_EN (1 << 1)
134 #define V3_COMMAND_M_IO_EN (1 << 0)
135
136 /* SYSTEM REGISTER bits
137 */
138 #define V3_SYSTEM_M_RST_OUT (1 << 15)
139 #define V3_SYSTEM_M_LOCK (1 << 14)
140
141 /* PCI_CFG bits
142 */
143 #define V3_PCI_CFG_M_I2O_EN (1 << 15)
144 #define V3_PCI_CFG_M_IO_REG_DIS (1 << 14)
145 #define V3_PCI_CFG_M_IO_DIS (1 << 13)
146 #define V3_PCI_CFG_M_EN3V (1 << 12)
147 #define V3_PCI_CFG_M_RETRY_EN (1 << 10)
148 #define V3_PCI_CFG_M_AD_LOW1 (1 << 9)
149 #define V3_PCI_CFG_M_AD_LOW0 (1 << 8)
150
151 /* PCI_BASE register bits (PCI -> Local Bus)
152 */
153 #define V3_PCI_BASE_M_ADR_BASE 0xFFF00000
154 #define V3_PCI_BASE_M_ADR_BASEL 0x000FFF00
155 #define V3_PCI_BASE_M_PREFETCH (1 << 3)
156 #define V3_PCI_BASE_M_TYPE (3 << 1)
157 #define V3_PCI_BASE_M_IO (1 << 0)
158
159 /* PCI MAP register bits (PCI -> Local bus)
160 */
161 #define V3_PCI_MAP_M_MAP_ADR 0xFFF00000
162 #define V3_PCI_MAP_M_RD_POST_INH (1 << 15)
163 #define V3_PCI_MAP_M_ROM_SIZE (3 << 10)
164 #define V3_PCI_MAP_M_SWAP (3 << 8)
165 #define V3_PCI_MAP_M_ADR_SIZE 0x000000F0
166 #define V3_PCI_MAP_M_REG_EN (1 << 1)
167 #define V3_PCI_MAP_M_ENABLE (1 << 0)
168
169 /*
170 * LB_BASE0,1 register bits (Local bus -> PCI)
171 */
172 #define V3_LB_BASE_ADR_BASE 0xfff00000
173 #define V3_LB_BASE_SWAP (3 << 8)
174 #define V3_LB_BASE_ADR_SIZE (15 << 4)
175 #define V3_LB_BASE_PREFETCH (1 << 3)
176 #define V3_LB_BASE_ENABLE (1 << 0)
177
178 #define V3_LB_BASE_ADR_SIZE_1MB (0 << 4)
179 #define V3_LB_BASE_ADR_SIZE_2MB (1 << 4)
180 #define V3_LB_BASE_ADR_SIZE_4MB (2 << 4)
181 #define V3_LB_BASE_ADR_SIZE_8MB (3 << 4)
182 #define V3_LB_BASE_ADR_SIZE_16MB (4 << 4)
183 #define V3_LB_BASE_ADR_SIZE_32MB (5 << 4)
184 #define V3_LB_BASE_ADR_SIZE_64MB (6 << 4)
185 #define V3_LB_BASE_ADR_SIZE_128MB (7 << 4)
186 #define V3_LB_BASE_ADR_SIZE_256MB (8 << 4)
187 #define V3_LB_BASE_ADR_SIZE_512MB (9 << 4)
188 #define V3_LB_BASE_ADR_SIZE_1GB (10 << 4)
189 #define V3_LB_BASE_ADR_SIZE_2GB (11 << 4)
190
191 #define v3_addr_to_lb_base(a) ((a) & V3_LB_BASE_ADR_BASE)
192
193 /*
194 * LB_MAP0,1 register bits (Local bus -> PCI)
195 */
196 #define V3_LB_MAP_MAP_ADR 0xfff0
197 #define V3_LB_MAP_TYPE (7 << 1)
198 #define V3_LB_MAP_AD_LOW_EN (1 << 0)
199
200 #define V3_LB_MAP_TYPE_IACK (0 << 1)
201 #define V3_LB_MAP_TYPE_IO (1 << 1)
202 #define V3_LB_MAP_TYPE_MEM (3 << 1)
203 #define V3_LB_MAP_TYPE_CONFIG (5 << 1)
204 #define V3_LB_MAP_TYPE_MEM_MULTIPLE (6 << 1)
205
206 #define v3_addr_to_lb_map(a) (((a) >> 16) & V3_LB_MAP_MAP_ADR)
207
208 /*
209 * LB_BASE2 register bits (Local bus -> PCI IO)
210 */
211 #define V3_LB_BASE2_ADR_BASE 0xff00
212 #define V3_LB_BASE2_SWAP (3 << 6)
213 #define V3_LB_BASE2_ENABLE (1 << 0)
214
215 #define v3_addr_to_lb_base2(a) (((a) >> 16) & V3_LB_BASE2_ADR_BASE)
216
217 /*
218 * LB_MAP2 register bits (Local bus -> PCI IO)
219 */
220 #define V3_LB_MAP2_MAP_ADR 0xff00
221
222 #define v3_addr_to_lb_map2(a) (((a) >> 16) & V3_LB_MAP2_MAP_ADR)
223
224 /*
225 * The V3 PCI interface chip in Integrator provides several windows from
226 * local bus memory into the PCI memory areas. Unfortunately, there
227 * are not really enough windows for our usage, therefore we reuse
228 * one of the windows for access to PCI configuration space. The
229 * memory map is as follows:
230 *
231 * Local Bus Memory Usage
232 *
233 * 40000000 - 4FFFFFFF PCI memory. 256M non-prefetchable
234 * 50000000 - 5FFFFFFF PCI memory. 256M prefetchable
235 * 60000000 - 60FFFFFF PCI IO. 16M
236 * 61000000 - 61FFFFFF PCI Configuration. 16M
237 *
238 * There are three V3 windows, each described by a pair of V3 registers.
239 * These are LB_BASE0/LB_MAP0, LB_BASE1/LB_MAP1 and LB_BASE2/LB_MAP2.
240 * Base0 and Base1 can be used for any type of PCI memory access. Base2
241 * can be used either for PCI I/O or for I20 accesses. By default, uHAL
242 * uses this only for PCI IO space.
243 *
244 * Normally these spaces are mapped using the following base registers:
245 *
246 * Usage Local Bus Memory Base/Map registers used
247 *
248 * Mem 40000000 - 4FFFFFFF LB_BASE0/LB_MAP0
249 * Mem 50000000 - 5FFFFFFF LB_BASE1/LB_MAP1
250 * IO 60000000 - 60FFFFFF LB_BASE2/LB_MAP2
251 * Cfg 61000000 - 61FFFFFF
252 *
253 * This means that I20 and PCI configuration space accesses will fail.
254 * When PCI configuration accesses are needed (via the uHAL PCI
255 * configuration space primitives) we must remap the spaces as follows:
256 *
257 * Usage Local Bus Memory Base/Map registers used
258 *
259 * Mem 40000000 - 4FFFFFFF LB_BASE0/LB_MAP0
260 * Mem 50000000 - 5FFFFFFF LB_BASE0/LB_MAP0
261 * IO 60000000 - 60FFFFFF LB_BASE2/LB_MAP2
262 * Cfg 61000000 - 61FFFFFF LB_BASE1/LB_MAP1
263 *
264 * To make this work, the code depends on overlapping windows working.
265 * The V3 chip translates an address by checking its range within
266 * each of the BASE/MAP pairs in turn (in ascending register number
267 * order). It will use the first matching pair. So, for example,
268 * if the same address is mapped by both LB_BASE0/LB_MAP0 and
269 * LB_BASE1/LB_MAP1, the V3 will use the translation from
270 * LB_BASE0/LB_MAP0.
271 *
272 * To allow PCI Configuration space access, the code enlarges the
273 * window mapped by LB_BASE0/LB_MAP0 from 256M to 512M. This occludes
274 * the windows currently mapped by LB_BASE1/LB_MAP1 so that it can
275 * be remapped for use by configuration cycles.
276 *
277 * At the end of the PCI Configuration space accesses,
278 * LB_BASE1/LB_MAP1 is reset to map PCI Memory. Finally the window
279 * mapped by LB_BASE0/LB_MAP0 is reduced in size from 512M to 256M to
280 * reveal the now restored LB_BASE1/LB_MAP1 window.
281 *
282 * NOTE: We do not set up I2O mapping. I suspect that this is only
283 * for an intelligent (target) device. Using I2O disables most of
284 * the mappings into PCI memory.
285 */
286
287 /* Filled in by probe */
288 static void __iomem *pci_v3_base;
289 /* CPU side memory ranges */
290 static struct resource conf_mem; /* FIXME: remap this instead of static map */
291 static struct resource io_mem;
292 static struct resource non_mem;
293 static struct resource pre_mem;
294 /* PCI side memory ranges */
295 static u64 non_mem_pci;
296 static u64 non_mem_pci_sz;
297 static u64 pre_mem_pci;
298 static u64 pre_mem_pci_sz;
299
300 // V3 access routines
301 #define v3_writeb(o,v) __raw_writeb(v, pci_v3_base + (unsigned int)(o))
302 #define v3_readb(o) (__raw_readb(pci_v3_base + (unsigned int)(o)))
303
304 #define v3_writew(o,v) __raw_writew(v, pci_v3_base + (unsigned int)(o))
305 #define v3_readw(o) (__raw_readw(pci_v3_base + (unsigned int)(o)))
306
307 #define v3_writel(o,v) __raw_writel(v, pci_v3_base + (unsigned int)(o))
308 #define v3_readl(o) (__raw_readl(pci_v3_base + (unsigned int)(o)))
309
310 /*============================================================================
311 *
312 * routine: uHALir_PCIMakeConfigAddress()
313 *
314 * parameters: bus = which bus
315 * device = which device
316 * function = which function
317 * offset = configuration space register we are interested in
318 *
319 * description: this routine will generate a platform dependent config
320 * address.
321 *
322 * calls: none
323 *
324 * returns: configuration address to play on the PCI bus
325 *
326 * To generate the appropriate PCI configuration cycles in the PCI
327 * configuration address space, you present the V3 with the following pattern
328 * (which is very nearly a type 1 (except that the lower two bits are 00 and
329 * not 01). In order for this mapping to work you need to set up one of
330 * the local to PCI aperatures to 16Mbytes in length translating to
331 * PCI configuration space starting at 0x0000.0000.
332 *
333 * PCI configuration cycles look like this:
334 *
335 * Type 0:
336 *
337 * 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
338 * 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
339 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
340 * | | |D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|0|
341 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
342 *
343 * 31:11 Device select bit.
344 * 10:8 Function number
345 * 7:2 Register number
346 *
347 * Type 1:
348 *
349 * 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
350 * 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
351 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
352 * | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1|
353 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
354 *
355 * 31:24 reserved
356 * 23:16 bus number (8 bits = 128 possible buses)
357 * 15:11 Device number (5 bits)
358 * 10:8 function number
359 * 7:2 register number
360 *
361 */
362 static DEFINE_RAW_SPINLOCK(v3_lock);
363
364 #undef V3_LB_BASE_PREFETCH
365 #define V3_LB_BASE_PREFETCH 0
366
367 static void __iomem *v3_open_config_window(struct pci_bus *bus,
368 unsigned int devfn, int offset)
369 {
370 unsigned int address, mapaddress, busnr;
371
372 busnr = bus->number;
373
374 /*
375 * Trap out illegal values
376 */
377 BUG_ON(offset > 255);
378 BUG_ON(busnr > 255);
379 BUG_ON(devfn > 255);
380
381 if (busnr == 0) {
382 int slot = PCI_SLOT(devfn);
383
384 /*
385 * local bus segment so need a type 0 config cycle
386 *
387 * build the PCI configuration "address" with one-hot in
388 * A31-A11
389 *
390 * mapaddress:
391 * 3:1 = config cycle (101)
392 * 0 = PCI A1 & A0 are 0 (0)
393 */
394 address = PCI_FUNC(devfn) << 8;
395 mapaddress = V3_LB_MAP_TYPE_CONFIG;
396
397 if (slot > 12)
398 /*
399 * high order bits are handled by the MAP register
400 */
401 mapaddress |= 1 << (slot - 5);
402 else
403 /*
404 * low order bits handled directly in the address
405 */
406 address |= 1 << (slot + 11);
407 } else {
408 /*
409 * not the local bus segment so need a type 1 config cycle
410 *
411 * address:
412 * 23:16 = bus number
413 * 15:11 = slot number (7:3 of devfn)
414 * 10:8 = func number (2:0 of devfn)
415 *
416 * mapaddress:
417 * 3:1 = config cycle (101)
418 * 0 = PCI A1 & A0 from host bus (1)
419 */
420 mapaddress = V3_LB_MAP_TYPE_CONFIG | V3_LB_MAP_AD_LOW_EN;
421 address = (busnr << 16) | (devfn << 8);
422 }
423
424 /*
425 * Set up base0 to see all 512Mbytes of memory space (not
426 * prefetchable), this frees up base1 for re-use by
427 * configuration memory
428 */
429 v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(non_mem.start) |
430 V3_LB_BASE_ADR_SIZE_512MB | V3_LB_BASE_ENABLE);
431
432 /*
433 * Set up base1/map1 to point into configuration space.
434 */
435 v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(conf_mem.start) |
436 V3_LB_BASE_ADR_SIZE_16MB | V3_LB_BASE_ENABLE);
437 v3_writew(V3_LB_MAP1, mapaddress);
438
439 return PCI_CONFIG_VADDR + address + offset;
440 }
441
442 static void v3_close_config_window(void)
443 {
444 /*
445 * Reassign base1 for use by prefetchable PCI memory
446 */
447 v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(pre_mem.start) |
448 V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_PREFETCH |
449 V3_LB_BASE_ENABLE);
450 v3_writew(V3_LB_MAP1, v3_addr_to_lb_map(pre_mem_pci) |
451 V3_LB_MAP_TYPE_MEM_MULTIPLE);
452
453 /*
454 * And shrink base0 back to a 256M window (NOTE: MAP0 already correct)
455 */
456 v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(non_mem.start) |
457 V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_ENABLE);
458 }
459
460 static int v3_read_config(struct pci_bus *bus, unsigned int devfn, int where,
461 int size, u32 *val)
462 {
463 void __iomem *addr;
464 unsigned long flags;
465 u32 v;
466
467 raw_spin_lock_irqsave(&v3_lock, flags);
468 addr = v3_open_config_window(bus, devfn, where);
469
470 switch (size) {
471 case 1:
472 v = __raw_readb(addr);
473 break;
474
475 case 2:
476 v = __raw_readw(addr);
477 break;
478
479 default:
480 v = __raw_readl(addr);
481 break;
482 }
483
484 v3_close_config_window();
485 raw_spin_unlock_irqrestore(&v3_lock, flags);
486
487 *val = v;
488 return PCIBIOS_SUCCESSFUL;
489 }
490
491 static int v3_write_config(struct pci_bus *bus, unsigned int devfn, int where,
492 int size, u32 val)
493 {
494 void __iomem *addr;
495 unsigned long flags;
496
497 raw_spin_lock_irqsave(&v3_lock, flags);
498 addr = v3_open_config_window(bus, devfn, where);
499
500 switch (size) {
501 case 1:
502 __raw_writeb((u8)val, addr);
503 __raw_readb(addr);
504 break;
505
506 case 2:
507 __raw_writew((u16)val, addr);
508 __raw_readw(addr);
509 break;
510
511 case 4:
512 __raw_writel(val, addr);
513 __raw_readl(addr);
514 break;
515 }
516
517 v3_close_config_window();
518 raw_spin_unlock_irqrestore(&v3_lock, flags);
519
520 return PCIBIOS_SUCCESSFUL;
521 }
522
523 static struct pci_ops pci_v3_ops = {
524 .read = v3_read_config,
525 .write = v3_write_config,
526 };
527
528 static int __init pci_v3_setup_resources(struct pci_sys_data *sys)
529 {
530 if (request_resource(&iomem_resource, &non_mem)) {
531 printk(KERN_ERR "PCI: unable to allocate non-prefetchable "
532 "memory region\n");
533 return -EBUSY;
534 }
535 if (request_resource(&iomem_resource, &pre_mem)) {
536 release_resource(&non_mem);
537 printk(KERN_ERR "PCI: unable to allocate prefetchable "
538 "memory region\n");
539 return -EBUSY;
540 }
541
542 /*
543 * the mem resource for this bus
544 * the prefetch mem resource for this bus
545 */
546 pci_add_resource_offset(&sys->resources, &non_mem, sys->mem_offset);
547 pci_add_resource_offset(&sys->resources, &pre_mem, sys->mem_offset);
548
549 return 1;
550 }
551
552 /*
553 * These don't seem to be implemented on the Integrator I have, which
554 * means I can't get additional information on the reason for the pm2fb
555 * problems. I suppose I'll just have to mind-meld with the machine. ;)
556 */
557 static void __iomem *ap_syscon_base;
558 #define INTEGRATOR_SC_PCIENABLE_OFFSET 0x18
559 #define INTEGRATOR_SC_LBFADDR_OFFSET 0x20
560 #define INTEGRATOR_SC_LBFCODE_OFFSET 0x24
561
562 static int
563 v3_pci_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
564 {
565 unsigned long pc = instruction_pointer(regs);
566 unsigned long instr = *(unsigned long *)pc;
567 #if 0
568 char buf[128];
569
570 sprintf(buf, "V3 fault: addr 0x%08lx, FSR 0x%03x, PC 0x%08lx [%08lx] LBFADDR=%08x LBFCODE=%02x ISTAT=%02x\n",
571 addr, fsr, pc, instr, __raw_readl(ap_syscon_base + INTEGRATOR_SC_LBFADDR_OFFSET), __raw_readl(ap_syscon_base + INTEGRATOR_SC_LBFCODE_OFFSET) & 255,
572 v3_readb(V3_LB_ISTAT));
573 printk(KERN_DEBUG "%s", buf);
574 #endif
575
576 v3_writeb(V3_LB_ISTAT, 0);
577 __raw_writel(3, ap_syscon_base + INTEGRATOR_SC_PCIENABLE_OFFSET);
578
579 /*
580 * If the instruction being executed was a read,
581 * make it look like it read all-ones.
582 */
583 if ((instr & 0x0c100000) == 0x04100000) {
584 int reg = (instr >> 12) & 15;
585 unsigned long val;
586
587 if (instr & 0x00400000)
588 val = 255;
589 else
590 val = -1;
591
592 regs->uregs[reg] = val;
593 regs->ARM_pc += 4;
594 return 0;
595 }
596
597 if ((instr & 0x0e100090) == 0x00100090) {
598 int reg = (instr >> 12) & 15;
599
600 regs->uregs[reg] = -1;
601 regs->ARM_pc += 4;
602 return 0;
603 }
604
605 return 1;
606 }
607
608 static irqreturn_t v3_irq(int dummy, void *devid)
609 {
610 #ifdef CONFIG_DEBUG_LL
611 struct pt_regs *regs = get_irq_regs();
612 unsigned long pc = instruction_pointer(regs);
613 unsigned long instr = *(unsigned long *)pc;
614 char buf[128];
615 extern void printascii(const char *);
616
617 sprintf(buf, "V3 int %d: pc=0x%08lx [%08lx] LBFADDR=%08x LBFCODE=%02x "
618 "ISTAT=%02x\n", IRQ_AP_V3INT, pc, instr,
619 __raw_readl(ap_syscon_base + INTEGRATOR_SC_LBFADDR_OFFSET),
620 __raw_readl(ap_syscon_base + INTEGRATOR_SC_LBFCODE_OFFSET) & 255,
621 v3_readb(V3_LB_ISTAT));
622 printascii(buf);
623 #endif
624
625 v3_writew(V3_PCI_STAT, 0xf000);
626 v3_writeb(V3_LB_ISTAT, 0);
627 __raw_writel(3, ap_syscon_base + INTEGRATOR_SC_PCIENABLE_OFFSET);
628
629 #ifdef CONFIG_DEBUG_LL
630 /*
631 * If the instruction being executed was a read,
632 * make it look like it read all-ones.
633 */
634 if ((instr & 0x0c100000) == 0x04100000) {
635 int reg = (instr >> 16) & 15;
636 sprintf(buf, " reg%d = %08lx\n", reg, regs->uregs[reg]);
637 printascii(buf);
638 }
639 #endif
640 return IRQ_HANDLED;
641 }
642
643 static int __init pci_v3_setup(int nr, struct pci_sys_data *sys)
644 {
645 int ret = 0;
646
647 if (!ap_syscon_base)
648 return -EINVAL;
649
650 if (nr == 0) {
651 sys->mem_offset = non_mem.start;
652 ret = pci_v3_setup_resources(sys);
653 }
654
655 return ret;
656 }
657
658 /*
659 * V3_LB_BASE? - local bus address
660 * V3_LB_MAP? - pci bus address
661 */
662 static void __init pci_v3_preinit(void)
663 {
664 unsigned long flags;
665 unsigned int temp;
666
667 pcibios_min_mem = 0x00100000;
668
669 /*
670 * Hook in our fault handler for PCI errors
671 */
672 hook_fault_code(4, v3_pci_fault, SIGBUS, 0, "external abort on linefetch");
673 hook_fault_code(6, v3_pci_fault, SIGBUS, 0, "external abort on linefetch");
674 hook_fault_code(8, v3_pci_fault, SIGBUS, 0, "external abort on non-linefetch");
675 hook_fault_code(10, v3_pci_fault, SIGBUS, 0, "external abort on non-linefetch");
676
677 raw_spin_lock_irqsave(&v3_lock, flags);
678
679 /*
680 * Unlock V3 registers, but only if they were previously locked.
681 */
682 if (v3_readw(V3_SYSTEM) & V3_SYSTEM_M_LOCK)
683 v3_writew(V3_SYSTEM, 0xa05f);
684
685 /*
686 * Setup window 0 - PCI non-prefetchable memory
687 * Local: 0x40000000 Bus: 0x00000000 Size: 256MB
688 */
689 v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(non_mem.start) |
690 V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_ENABLE);
691 v3_writew(V3_LB_MAP0, v3_addr_to_lb_map(non_mem_pci) |
692 V3_LB_MAP_TYPE_MEM);
693
694 /*
695 * Setup window 1 - PCI prefetchable memory
696 * Local: 0x50000000 Bus: 0x10000000 Size: 256MB
697 */
698 v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(pre_mem.start) |
699 V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_PREFETCH |
700 V3_LB_BASE_ENABLE);
701 v3_writew(V3_LB_MAP1, v3_addr_to_lb_map(pre_mem_pci) |
702 V3_LB_MAP_TYPE_MEM_MULTIPLE);
703
704 /*
705 * Setup window 2 - PCI IO
706 */
707 v3_writel(V3_LB_BASE2, v3_addr_to_lb_base2(io_mem.start) |
708 V3_LB_BASE_ENABLE);
709 v3_writew(V3_LB_MAP2, v3_addr_to_lb_map2(0));
710
711 /*
712 * Disable PCI to host IO cycles
713 */
714 temp = v3_readw(V3_PCI_CFG) & ~V3_PCI_CFG_M_I2O_EN;
715 temp |= V3_PCI_CFG_M_IO_REG_DIS | V3_PCI_CFG_M_IO_DIS;
716 v3_writew(V3_PCI_CFG, temp);
717
718 printk(KERN_DEBUG "FIFO_CFG: %04x FIFO_PRIO: %04x\n",
719 v3_readw(V3_FIFO_CFG), v3_readw(V3_FIFO_PRIORITY));
720
721 /*
722 * Set the V3 FIFO such that writes have higher priority than
723 * reads, and local bus write causes local bus read fifo flush.
724 * Same for PCI.
725 */
726 v3_writew(V3_FIFO_PRIORITY, 0x0a0a);
727
728 /*
729 * Re-lock the system register.
730 */
731 temp = v3_readw(V3_SYSTEM) | V3_SYSTEM_M_LOCK;
732 v3_writew(V3_SYSTEM, temp);
733
734 /*
735 * Clear any error conditions, and enable write errors.
736 */
737 v3_writeb(V3_LB_ISTAT, 0);
738 v3_writew(V3_LB_CFG, v3_readw(V3_LB_CFG) | (1 << 10));
739 v3_writeb(V3_LB_IMASK, 0x28);
740 __raw_writel(3, ap_syscon_base + INTEGRATOR_SC_PCIENABLE_OFFSET);
741
742 raw_spin_unlock_irqrestore(&v3_lock, flags);
743 }
744
745 static void __init pci_v3_postinit(void)
746 {
747 unsigned int pci_cmd;
748
749 pci_cmd = PCI_COMMAND_MEMORY |
750 PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE;
751
752 v3_writew(V3_PCI_CMD, pci_cmd);
753
754 v3_writeb(V3_LB_ISTAT, ~0x40);
755 v3_writeb(V3_LB_IMASK, 0x68);
756
757 #if 0
758 ret = request_irq(IRQ_AP_LBUSTIMEOUT, lb_timeout, 0, "bus timeout", NULL);
759 if (ret)
760 printk(KERN_ERR "PCI: unable to grab local bus timeout "
761 "interrupt: %d\n", ret);
762 #endif
763
764 register_isa_ports(non_mem.start, io_mem.start, 0);
765 }
766
767 /*
768 * A small note about bridges and interrupts. The DECchip 21050 (and
769 * later) adheres to the PCI-PCI bridge specification. This says that
770 * the interrupts on the other side of a bridge are swizzled in the
771 * following manner:
772 *
773 * Dev Interrupt Interrupt
774 * Pin on Pin on
775 * Device Connector
776 *
777 * 4 A A
778 * B B
779 * C C
780 * D D
781 *
782 * 5 A B
783 * B C
784 * C D
785 * D A
786 *
787 * 6 A C
788 * B D
789 * C A
790 * D B
791 *
792 * 7 A D
793 * B A
794 * C B
795 * D C
796 *
797 * Where A = pin 1, B = pin 2 and so on and pin=0 = default = A.
798 * Thus, each swizzle is ((pin-1) + (device#-4)) % 4
799 */
800
801 /*
802 * This routine handles multiple bridges.
803 */
804 static u8 __init pci_v3_swizzle(struct pci_dev *dev, u8 *pinp)
805 {
806 if (*pinp == 0)
807 *pinp = 1;
808
809 return pci_common_swizzle(dev, pinp);
810 }
811
812 static int irq_tab[4] __initdata = {
813 IRQ_AP_PCIINT0, IRQ_AP_PCIINT1, IRQ_AP_PCIINT2, IRQ_AP_PCIINT3
814 };
815
816 /*
817 * map the specified device/slot/pin to an IRQ. This works out such
818 * that slot 9 pin 1 is INT0, pin 2 is INT1, and slot 10 pin 1 is INT1.
819 */
820 static int __init pci_v3_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
821 {
822 int intnr = ((slot - 9) + (pin - 1)) & 3;
823
824 return irq_tab[intnr];
825 }
826
827 static struct hw_pci pci_v3 __initdata = {
828 .swizzle = pci_v3_swizzle,
829 .setup = pci_v3_setup,
830 .nr_controllers = 1,
831 .ops = &pci_v3_ops,
832 .preinit = pci_v3_preinit,
833 .postinit = pci_v3_postinit,
834 };
835
836 #ifdef CONFIG_OF
837
838 static int __init pci_v3_map_irq_dt(const struct pci_dev *dev, u8 slot, u8 pin)
839 {
840 struct of_irq oirq;
841 int ret;
842
843 ret = of_irq_map_pci(dev, &oirq);
844 if (ret) {
845 dev_err(&dev->dev, "of_irq_map_pci() %d\n", ret);
846 /* Proper return code 0 == NO_IRQ */
847 return 0;
848 }
849
850 return irq_create_of_mapping(oirq.controller, oirq.specifier,
851 oirq.size);
852 }
853
854 static int __init pci_v3_dtprobe(struct platform_device *pdev,
855 struct device_node *np)
856 {
857 struct of_pci_range_parser parser;
858 struct of_pci_range range;
859 struct resource *res;
860 int irq, ret;
861
862 if (of_pci_range_parser_init(&parser, np))
863 return -EINVAL;
864
865 /* Get base for bridge registers */
866 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
867 if (!res) {
868 dev_err(&pdev->dev, "unable to obtain PCIv3 base\n");
869 return -ENODEV;
870 }
871 pci_v3_base = devm_ioremap(&pdev->dev, res->start,
872 resource_size(res));
873 if (!pci_v3_base) {
874 dev_err(&pdev->dev, "unable to remap PCIv3 base\n");
875 return -ENODEV;
876 }
877
878 /* Get and request error IRQ resource */
879 irq = platform_get_irq(pdev, 0);
880 if (irq <= 0) {
881 dev_err(&pdev->dev, "unable to obtain PCIv3 error IRQ\n");
882 return -ENODEV;
883 }
884 ret = devm_request_irq(&pdev->dev, irq, v3_irq, 0,
885 "PCIv3 error", NULL);
886 if (ret < 0) {
887 dev_err(&pdev->dev, "unable to request PCIv3 error IRQ %d (%d)\n", irq, ret);
888 return ret;
889 }
890
891 for_each_of_pci_range(&parser, &range) {
892 if (!range.flags) {
893 of_pci_range_to_resource(&range, np, &conf_mem);
894 conf_mem.name = "PCIv3 config";
895 }
896 if (range.flags & IORESOURCE_IO) {
897 of_pci_range_to_resource(&range, np, &io_mem);
898 io_mem.name = "PCIv3 I/O";
899 }
900 if ((range.flags & IORESOURCE_MEM) &&
901 !(range.flags & IORESOURCE_PREFETCH)) {
902 non_mem_pci = range.pci_addr;
903 non_mem_pci_sz = range.size;
904 of_pci_range_to_resource(&range, np, &non_mem);
905 non_mem.name = "PCIv3 non-prefetched mem";
906 }
907 if ((range.flags & IORESOURCE_MEM) &&
908 (range.flags & IORESOURCE_PREFETCH)) {
909 pre_mem_pci = range.pci_addr;
910 pre_mem_pci_sz = range.size;
911 of_pci_range_to_resource(&range, np, &pre_mem);
912 pre_mem.name = "PCIv3 prefetched mem";
913 }
914 }
915
916 if (!conf_mem.start || !io_mem.start ||
917 !non_mem.start || !pre_mem.start) {
918 dev_err(&pdev->dev, "missing ranges in device node\n");
919 return -EINVAL;
920 }
921
922 pci_v3.map_irq = pci_v3_map_irq_dt;
923 pci_common_init_dev(&pdev->dev, &pci_v3);
924
925 return 0;
926 }
927
928 #else
929
930 static inline int pci_v3_dtprobe(struct platform_device *pdev,
931 struct device_node *np)
932 {
933 return -EINVAL;
934 }
935
936 #endif
937
938 static int __init pci_v3_probe(struct platform_device *pdev)
939 {
940 struct device_node *np = pdev->dev.of_node;
941 int ret;
942
943 /* Remap the Integrator system controller */
944 ap_syscon_base = ioremap(INTEGRATOR_SC_BASE, 0x100);
945 if (!ap_syscon_base) {
946 dev_err(&pdev->dev, "unable to remap the AP syscon for PCIv3\n");
947 return -ENODEV;
948 }
949
950 /* Device tree probe path */
951 if (np)
952 return pci_v3_dtprobe(pdev, np);
953
954 pci_v3_base = devm_ioremap(&pdev->dev, PHYS_PCI_V3_BASE, SZ_64K);
955 if (!pci_v3_base) {
956 dev_err(&pdev->dev, "unable to remap PCIv3 base\n");
957 return -ENODEV;
958 }
959
960 ret = devm_request_irq(&pdev->dev, IRQ_AP_V3INT, v3_irq, 0, "V3", NULL);
961 if (ret) {
962 dev_err(&pdev->dev, "unable to grab PCI error interrupt: %d\n",
963 ret);
964 return -ENODEV;
965 }
966
967 conf_mem.name = "PCIv3 config";
968 conf_mem.start = PHYS_PCI_CONFIG_BASE;
969 conf_mem.end = PHYS_PCI_CONFIG_BASE + SZ_16M - 1;
970 conf_mem.flags = IORESOURCE_MEM;
971
972 io_mem.name = "PCIv3 I/O";
973 io_mem.start = PHYS_PCI_IO_BASE;
974 io_mem.end = PHYS_PCI_IO_BASE + SZ_16M - 1;
975 io_mem.flags = IORESOURCE_MEM;
976
977 non_mem_pci = 0x00000000;
978 non_mem_pci_sz = SZ_256M;
979 non_mem.name = "PCIv3 non-prefetched mem";
980 non_mem.start = PHYS_PCI_MEM_BASE;
981 non_mem.end = PHYS_PCI_MEM_BASE + SZ_256M - 1;
982 non_mem.flags = IORESOURCE_MEM;
983
984 pre_mem_pci = 0x10000000;
985 pre_mem_pci_sz = SZ_256M;
986 pre_mem.name = "PCIv3 prefetched mem";
987 pre_mem.start = PHYS_PCI_PRE_BASE + SZ_256M;
988 pre_mem.end = PHYS_PCI_PRE_BASE + SZ_256M - 1;
989 pre_mem.flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
990
991 pci_v3.map_irq = pci_v3_map_irq;
992
993 pci_common_init_dev(&pdev->dev, &pci_v3);
994
995 return 0;
996 }
997
998 static const struct of_device_id pci_ids[] = {
999 { .compatible = "v3,v360epc-pci", },
1000 {},
1001 };
1002
1003 static struct platform_driver pci_v3_driver = {
1004 .driver = {
1005 .name = "pci-v3",
1006 .of_match_table = pci_ids,
1007 },
1008 };
1009
1010 static int __init pci_v3_init(void)
1011 {
1012 return platform_driver_probe(&pci_v3_driver, pci_v3_probe);
1013 }
1014
1015 subsys_initcall(pci_v3_init);
1016
1017 /*
1018 * Static mappings for the PCIv3 bridge
1019 *
1020 * e8000000 40000000 PCI memory PHYS_PCI_MEM_BASE (max 512M)
1021 * ec000000 61000000 PCI config space PHYS_PCI_CONFIG_BASE (max 16M)
1022 * fee00000 60000000 PCI IO PHYS_PCI_IO_BASE (max 16M)
1023 */
1024 static struct map_desc pci_v3_io_desc[] __initdata __maybe_unused = {
1025 {
1026 .virtual = (unsigned long)PCI_MEMORY_VADDR,
1027 .pfn = __phys_to_pfn(PHYS_PCI_MEM_BASE),
1028 .length = SZ_16M,
1029 .type = MT_DEVICE
1030 }, {
1031 .virtual = (unsigned long)PCI_CONFIG_VADDR,
1032 .pfn = __phys_to_pfn(PHYS_PCI_CONFIG_BASE),
1033 .length = SZ_16M,
1034 .type = MT_DEVICE
1035 }
1036 };
1037
1038 int __init pci_v3_early_init(void)
1039 {
1040 iotable_init(pci_v3_io_desc, ARRAY_SIZE(pci_v3_io_desc));
1041 vga_base = (unsigned long)PCI_MEMORY_VADDR;
1042 pci_map_io_early(__phys_to_pfn(PHYS_PCI_IO_BASE));
1043 return 0;
1044 }
Linux kernel - Deliverables
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