warp: Add initial WaRP Board support
[platform/kernel/u-boot.git] / drivers / pci / pci_auto.c
1 /*
2  * arch/powerpc/kernel/pci_auto.c
3  *
4  * PCI autoconfiguration library
5  *
6  * Author: Matt Porter <mporter@mvista.com>
7  *
8  * Copyright 2000 MontaVista Software Inc.
9  *
10  * SPDX-License-Identifier:     GPL-2.0+
11  */
12
13 #include <common.h>
14 #include <errno.h>
15 #include <pci.h>
16
17 #undef DEBUG
18 #ifdef DEBUG
19 #define DEBUGF(x...) printf(x)
20 #else
21 #define DEBUGF(x...)
22 #endif /* DEBUG */
23
24 #define PCIAUTO_IDE_MODE_MASK           0x05
25
26 /* the user can define CONFIG_SYS_PCI_CACHE_LINE_SIZE to avoid problems */
27 #ifndef CONFIG_SYS_PCI_CACHE_LINE_SIZE
28 #define CONFIG_SYS_PCI_CACHE_LINE_SIZE  8
29 #endif
30
31 /*
32  *
33  */
34
35 void pciauto_region_init(struct pci_region *res)
36 {
37         /*
38          * Avoid allocating PCI resources from address 0 -- this is illegal
39          * according to PCI 2.1 and moreover, this is known to cause Linux IDE
40          * drivers to fail. Use a reasonable starting value of 0x1000 instead.
41          */
42         res->bus_lower = res->bus_start ? res->bus_start : 0x1000;
43 }
44
45 void pciauto_region_align(struct pci_region *res, pci_size_t size)
46 {
47         res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1;
48 }
49
50 int pciauto_region_allocate(struct pci_region *res, pci_size_t size,
51         pci_addr_t *bar)
52 {
53         pci_addr_t addr;
54
55         if (!res) {
56                 DEBUGF("No resource");
57                 goto error;
58         }
59
60         addr = ((res->bus_lower - 1) | (size - 1)) + 1;
61
62         if (addr - res->bus_start + size > res->size) {
63                 DEBUGF("No room in resource");
64                 goto error;
65         }
66
67         res->bus_lower = addr + size;
68
69         DEBUGF("address=0x%llx bus_lower=0x%llx", (u64)addr, (u64)res->bus_lower);
70
71         *bar = addr;
72         return 0;
73
74  error:
75         *bar = (pci_addr_t)-1;
76         return -1;
77 }
78
79 /*
80  *
81  */
82
83 void pciauto_setup_device(struct pci_controller *hose,
84                           pci_dev_t dev, int bars_num,
85                           struct pci_region *mem,
86                           struct pci_region *prefetch,
87                           struct pci_region *io)
88 {
89         u32 bar_response;
90         pci_size_t bar_size;
91         u16 cmdstat = 0;
92         int bar, bar_nr = 0;
93 #ifndef CONFIG_PCI_ENUM_ONLY
94         pci_addr_t bar_value;
95         struct pci_region *bar_res;
96         int found_mem64 = 0;
97 #endif
98
99         pci_hose_read_config_word(hose, dev, PCI_COMMAND, &cmdstat);
100         cmdstat = (cmdstat & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) | PCI_COMMAND_MASTER;
101
102         for (bar = PCI_BASE_ADDRESS_0;
103                 bar < PCI_BASE_ADDRESS_0 + (bars_num * 4); bar += 4) {
104                 /* Tickle the BAR and get the response */
105 #ifndef CONFIG_PCI_ENUM_ONLY
106                 pci_hose_write_config_dword(hose, dev, bar, 0xffffffff);
107 #endif
108                 pci_hose_read_config_dword(hose, dev, bar, &bar_response);
109
110                 /* If BAR is not implemented go to the next BAR */
111                 if (!bar_response)
112                         continue;
113
114 #ifndef CONFIG_PCI_ENUM_ONLY
115                 found_mem64 = 0;
116 #endif
117
118                 /* Check the BAR type and set our address mask */
119                 if (bar_response & PCI_BASE_ADDRESS_SPACE) {
120                         bar_size = ((~(bar_response & PCI_BASE_ADDRESS_IO_MASK))
121                                    & 0xffff) + 1;
122 #ifndef CONFIG_PCI_ENUM_ONLY
123                         bar_res = io;
124 #endif
125
126                         DEBUGF("PCI Autoconfig: BAR %d, I/O, size=0x%llx, ", bar_nr, (u64)bar_size);
127                 } else {
128                         if ((bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
129                              PCI_BASE_ADDRESS_MEM_TYPE_64) {
130                                 u32 bar_response_upper;
131                                 u64 bar64;
132
133 #ifndef CONFIG_PCI_ENUM_ONLY
134                                 pci_hose_write_config_dword(hose, dev, bar + 4,
135                                         0xffffffff);
136 #endif
137                                 pci_hose_read_config_dword(hose, dev, bar + 4,
138                                         &bar_response_upper);
139
140                                 bar64 = ((u64)bar_response_upper << 32) | bar_response;
141
142                                 bar_size = ~(bar64 & PCI_BASE_ADDRESS_MEM_MASK) + 1;
143 #ifndef CONFIG_PCI_ENUM_ONLY
144                                 found_mem64 = 1;
145 #endif
146                         } else {
147                                 bar_size = (u32)(~(bar_response & PCI_BASE_ADDRESS_MEM_MASK) + 1);
148                         }
149 #ifndef CONFIG_PCI_ENUM_ONLY
150                         if (prefetch && (bar_response & PCI_BASE_ADDRESS_MEM_PREFETCH))
151                                 bar_res = prefetch;
152                         else
153                                 bar_res = mem;
154 #endif
155
156                         DEBUGF("PCI Autoconfig: BAR %d, Mem, size=0x%llx, ", bar_nr, (u64)bar_size);
157                 }
158
159 #ifndef CONFIG_PCI_ENUM_ONLY
160                 if (pciauto_region_allocate(bar_res, bar_size, &bar_value) == 0) {
161                         /* Write it out and update our limit */
162                         pci_hose_write_config_dword(hose, dev, bar, (u32)bar_value);
163
164                         if (found_mem64) {
165                                 bar += 4;
166 #ifdef CONFIG_SYS_PCI_64BIT
167                                 pci_hose_write_config_dword(hose, dev, bar, (u32)(bar_value>>32));
168 #else
169                                 /*
170                                  * If we are a 64-bit decoder then increment to the
171                                  * upper 32 bits of the bar and force it to locate
172                                  * in the lower 4GB of memory.
173                                  */
174                                 pci_hose_write_config_dword(hose, dev, bar, 0x00000000);
175 #endif
176                         }
177
178                 }
179 #endif
180                 cmdstat |= (bar_response & PCI_BASE_ADDRESS_SPACE) ?
181                         PCI_COMMAND_IO : PCI_COMMAND_MEMORY;
182
183                 DEBUGF("\n");
184
185                 bar_nr++;
186         }
187
188         pci_hose_write_config_word(hose, dev, PCI_COMMAND, cmdstat);
189         pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE,
190                 CONFIG_SYS_PCI_CACHE_LINE_SIZE);
191         pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);
192 }
193
194 int pciauto_setup_rom(struct pci_controller *hose, pci_dev_t dev)
195 {
196         pci_addr_t bar_value;
197         pci_size_t bar_size;
198         u32 bar_response;
199         u16 cmdstat = 0;
200
201         pci_hose_write_config_dword(hose, dev, PCI_ROM_ADDRESS, 0xfffffffe);
202         pci_hose_read_config_dword(hose, dev, PCI_ROM_ADDRESS, &bar_response);
203         if (!bar_response)
204                 return -ENOENT;
205
206         bar_size = -(bar_response & ~1);
207         DEBUGF("PCI Autoconfig: ROM, size=%#x, ", bar_size);
208         if (pciauto_region_allocate(hose->pci_mem, bar_size, &bar_value) == 0) {
209                 pci_hose_write_config_dword(hose, dev, PCI_ROM_ADDRESS,
210                                             bar_value);
211         }
212         DEBUGF("\n");
213         pci_hose_read_config_word(hose, dev, PCI_COMMAND, &cmdstat);
214         cmdstat |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
215         pci_hose_write_config_word(hose, dev, PCI_COMMAND, cmdstat);
216
217         return 0;
218 }
219
220 void pciauto_prescan_setup_bridge(struct pci_controller *hose,
221                                          pci_dev_t dev, int sub_bus)
222 {
223         struct pci_region *pci_mem = hose->pci_mem;
224         struct pci_region *pci_prefetch = hose->pci_prefetch;
225         struct pci_region *pci_io = hose->pci_io;
226         u16 cmdstat;
227
228         pci_hose_read_config_word(hose, dev, PCI_COMMAND, &cmdstat);
229
230         /* Configure bus number registers */
231         pci_hose_write_config_byte(hose, dev, PCI_PRIMARY_BUS,
232                                    PCI_BUS(dev) - hose->first_busno);
233         pci_hose_write_config_byte(hose, dev, PCI_SECONDARY_BUS,
234                                    sub_bus - hose->first_busno);
235         pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS, 0xff);
236
237         if (pci_mem) {
238                 /* Round memory allocator to 1MB boundary */
239                 pciauto_region_align(pci_mem, 0x100000);
240
241                 /* Set up memory and I/O filter limits, assume 32-bit I/O space */
242                 pci_hose_write_config_word(hose, dev, PCI_MEMORY_BASE,
243                                         (pci_mem->bus_lower & 0xfff00000) >> 16);
244
245                 cmdstat |= PCI_COMMAND_MEMORY;
246         }
247
248         if (pci_prefetch) {
249                 /* Round memory allocator to 1MB boundary */
250                 pciauto_region_align(pci_prefetch, 0x100000);
251
252                 /* Set up memory and I/O filter limits, assume 32-bit I/O space */
253                 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE,
254                                         (pci_prefetch->bus_lower & 0xfff00000) >> 16);
255
256                 cmdstat |= PCI_COMMAND_MEMORY;
257         } else {
258                 /* We don't support prefetchable memory for now, so disable */
259                 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE, 0x1000);
260                 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT, 0x0);
261         }
262
263         if (pci_io) {
264                 /* Round I/O allocator to 4KB boundary */
265                 pciauto_region_align(pci_io, 0x1000);
266
267                 pci_hose_write_config_byte(hose, dev, PCI_IO_BASE,
268                                         (pci_io->bus_lower & 0x0000f000) >> 8);
269                 pci_hose_write_config_word(hose, dev, PCI_IO_BASE_UPPER16,
270                                         (pci_io->bus_lower & 0xffff0000) >> 16);
271
272                 cmdstat |= PCI_COMMAND_IO;
273         }
274
275         /* Enable memory and I/O accesses, enable bus master */
276         pci_hose_write_config_word(hose, dev, PCI_COMMAND,
277                                         cmdstat | PCI_COMMAND_MASTER);
278 }
279
280 void pciauto_postscan_setup_bridge(struct pci_controller *hose,
281                                           pci_dev_t dev, int sub_bus)
282 {
283         struct pci_region *pci_mem = hose->pci_mem;
284         struct pci_region *pci_prefetch = hose->pci_prefetch;
285         struct pci_region *pci_io = hose->pci_io;
286
287         /* Configure bus number registers */
288         pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS,
289                                    sub_bus - hose->first_busno);
290
291         if (pci_mem) {
292                 /* Round memory allocator to 1MB boundary */
293                 pciauto_region_align(pci_mem, 0x100000);
294
295                 pci_hose_write_config_word(hose, dev, PCI_MEMORY_LIMIT,
296                                 (pci_mem->bus_lower - 1) >> 16);
297         }
298
299         if (pci_prefetch) {
300                 /* Round memory allocator to 1MB boundary */
301                 pciauto_region_align(pci_prefetch, 0x100000);
302
303                 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT,
304                                 (pci_prefetch->bus_lower - 1) >> 16);
305         }
306
307         if (pci_io) {
308                 /* Round I/O allocator to 4KB boundary */
309                 pciauto_region_align(pci_io, 0x1000);
310
311                 pci_hose_write_config_byte(hose, dev, PCI_IO_LIMIT,
312                                 ((pci_io->bus_lower - 1) & 0x0000f000) >> 8);
313                 pci_hose_write_config_word(hose, dev, PCI_IO_LIMIT_UPPER16,
314                                 ((pci_io->bus_lower - 1) & 0xffff0000) >> 16);
315         }
316 }
317
318 /*
319  *
320  */
321
322 void pciauto_config_init(struct pci_controller *hose)
323 {
324         int i;
325
326         hose->pci_io = hose->pci_mem = hose->pci_prefetch = NULL;
327
328         for (i = 0; i < hose->region_count; i++) {
329                 switch(hose->regions[i].flags) {
330                 case PCI_REGION_IO:
331                         if (!hose->pci_io ||
332                             hose->pci_io->size < hose->regions[i].size)
333                                 hose->pci_io = hose->regions + i;
334                         break;
335                 case PCI_REGION_MEM:
336                         if (!hose->pci_mem ||
337                             hose->pci_mem->size < hose->regions[i].size)
338                                 hose->pci_mem = hose->regions + i;
339                         break;
340                 case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
341                         if (!hose->pci_prefetch ||
342                             hose->pci_prefetch->size < hose->regions[i].size)
343                                 hose->pci_prefetch = hose->regions + i;
344                         break;
345                 }
346         }
347
348
349         if (hose->pci_mem) {
350                 pciauto_region_init(hose->pci_mem);
351
352                 DEBUGF("PCI Autoconfig: Bus Memory region: [0x%llx-0x%llx],\n"
353                        "\t\tPhysical Memory [%llx-%llxx]\n",
354                     (u64)hose->pci_mem->bus_start,
355                     (u64)(hose->pci_mem->bus_start + hose->pci_mem->size - 1),
356                     (u64)hose->pci_mem->phys_start,
357                     (u64)(hose->pci_mem->phys_start + hose->pci_mem->size - 1));
358         }
359
360         if (hose->pci_prefetch) {
361                 pciauto_region_init(hose->pci_prefetch);
362
363                 DEBUGF("PCI Autoconfig: Bus Prefetchable Mem: [0x%llx-0x%llx],\n"
364                        "\t\tPhysical Memory [%llx-%llx]\n",
365                     (u64)hose->pci_prefetch->bus_start,
366                     (u64)(hose->pci_prefetch->bus_start +
367                             hose->pci_prefetch->size - 1),
368                     (u64)hose->pci_prefetch->phys_start,
369                     (u64)(hose->pci_prefetch->phys_start +
370                             hose->pci_prefetch->size - 1));
371         }
372
373         if (hose->pci_io) {
374                 pciauto_region_init(hose->pci_io);
375
376                 DEBUGF("PCI Autoconfig: Bus I/O region: [0x%llx-0x%llx],\n"
377                        "\t\tPhysical Memory: [%llx-%llx]\n",
378                     (u64)hose->pci_io->bus_start,
379                     (u64)(hose->pci_io->bus_start + hose->pci_io->size - 1),
380                     (u64)hose->pci_io->phys_start,
381                     (u64)(hose->pci_io->phys_start + hose->pci_io->size - 1));
382
383         }
384 }
385
386 /*
387  * HJF: Changed this to return int. I think this is required
388  * to get the correct result when scanning bridges
389  */
390 int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev)
391 {
392         unsigned int sub_bus = PCI_BUS(dev);
393         unsigned short class;
394         unsigned char prg_iface;
395         int n;
396
397         pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);
398
399         switch (class) {
400         case PCI_CLASS_BRIDGE_PCI:
401                 hose->current_busno++;
402                 pciauto_setup_device(hose, dev, 2, hose->pci_mem,
403                         hose->pci_prefetch, hose->pci_io);
404
405                 DEBUGF("PCI Autoconfig: Found P2P bridge, device %d\n", PCI_DEV(dev));
406
407                 /* Passing in current_busno allows for sibling P2P bridges */
408                 pciauto_prescan_setup_bridge(hose, dev, hose->current_busno);
409                 /*
410                  * need to figure out if this is a subordinate bridge on the bus
411                  * to be able to properly set the pri/sec/sub bridge registers.
412                  */
413                 n = pci_hose_scan_bus(hose, hose->current_busno);
414
415                 /* figure out the deepest we've gone for this leg */
416                 sub_bus = max((unsigned int)n, sub_bus);
417                 pciauto_postscan_setup_bridge(hose, dev, sub_bus);
418
419                 sub_bus = hose->current_busno;
420                 break;
421
422         case PCI_CLASS_STORAGE_IDE:
423                 pci_hose_read_config_byte(hose, dev, PCI_CLASS_PROG, &prg_iface);
424                 if (!(prg_iface & PCIAUTO_IDE_MODE_MASK)) {
425                         DEBUGF("PCI Autoconfig: Skipping legacy mode IDE controller\n");
426                         return sub_bus;
427                 }
428
429                 pciauto_setup_device(hose, dev, 6, hose->pci_mem,
430                         hose->pci_prefetch, hose->pci_io);
431                 break;
432
433         case PCI_CLASS_BRIDGE_CARDBUS:
434                 /*
435                  * just do a minimal setup of the bridge,
436                  * let the OS take care of the rest
437                  */
438                 pciauto_setup_device(hose, dev, 0, hose->pci_mem,
439                         hose->pci_prefetch, hose->pci_io);
440
441                 DEBUGF("PCI Autoconfig: Found P2CardBus bridge, device %d\n",
442                         PCI_DEV(dev));
443
444                 hose->current_busno++;
445                 break;
446
447 #if defined(CONFIG_PCIAUTO_SKIP_HOST_BRIDGE)
448         case PCI_CLASS_BRIDGE_OTHER:
449                 DEBUGF("PCI Autoconfig: Skipping bridge device %d\n",
450                        PCI_DEV(dev));
451                 break;
452 #endif
453 #if defined(CONFIG_MPC834x) && !defined(CONFIG_VME8349)
454         case PCI_CLASS_BRIDGE_OTHER:
455                 /*
456                  * The host/PCI bridge 1 seems broken in 8349 - it presents
457                  * itself as 'PCI_CLASS_BRIDGE_OTHER' and appears as an _agent_
458                  * device claiming resources io/mem/irq.. we only allow for
459                  * the PIMMR window to be allocated (BAR0 - 1MB size)
460                  */
461                 DEBUGF("PCI Autoconfig: Broken bridge found, only minimal config\n");
462                 pciauto_setup_device(hose, dev, 0, hose->pci_mem,
463                         hose->pci_prefetch, hose->pci_io);
464                 break;
465 #endif
466
467         case PCI_CLASS_PROCESSOR_POWERPC: /* an agent or end-point */
468                 DEBUGF("PCI AutoConfig: Found PowerPC device\n");
469
470         default:
471                 pciauto_setup_device(hose, dev, 6, hose->pci_mem,
472                         hose->pci_prefetch, hose->pci_io);
473                 break;
474         }
475
476         return sub_bus;
477 }