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1da177e4 LT |
1 | /* pci-vdk.c: MB93090-MB00 (VDK) PCI support |
2 | * | |
3 | * Copyright (C) 2003, 2004 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/types.h> |
13 | #include <linux/kernel.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/pci.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/ioport.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/slab.h> | |
20 | ||
21 | #include <asm/segment.h> | |
22 | #include <asm/io.h> | |
23 | #include <asm/mb-regs.h> | |
24 | #include <asm/mb86943a.h> | |
25 | #include "pci-frv.h" | |
26 | ||
27 | unsigned int __nongpreldata pci_probe = 1; | |
28 | ||
29 | int __nongpreldata pcibios_last_bus = -1; | |
30 | struct pci_bus *__nongpreldata pci_root_bus; | |
31 | struct pci_ops *__nongpreldata pci_root_ops; | |
32 | ||
33 | /* | |
34 | * Functions for accessing PCI configuration space | |
35 | */ | |
36 | ||
37 | #define CONFIG_CMD(bus, dev, where) \ | |
38 | (0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3)) | |
39 | ||
40 | #define __set_PciCfgAddr(A) writel((A), (volatile void __iomem *) __region_CS1 + 0x80) | |
41 | ||
42 | #define __get_PciCfgDataB(A) readb((volatile void __iomem *) __region_CS1 + 0x88 + ((A) & 3)) | |
43 | #define __get_PciCfgDataW(A) readw((volatile void __iomem *) __region_CS1 + 0x88 + ((A) & 2)) | |
44 | #define __get_PciCfgDataL(A) readl((volatile void __iomem *) __region_CS1 + 0x88) | |
45 | ||
46 | #define __set_PciCfgDataB(A,V) \ | |
47 | writeb((V), (volatile void __iomem *) __region_CS1 + 0x88 + (3 - ((A) & 3))) | |
48 | ||
49 | #define __set_PciCfgDataW(A,V) \ | |
50 | writew((V), (volatile void __iomem *) __region_CS1 + 0x88 + (2 - ((A) & 2))) | |
51 | ||
52 | #define __set_PciCfgDataL(A,V) \ | |
53 | writel((V), (volatile void __iomem *) __region_CS1 + 0x88) | |
54 | ||
55 | #define __get_PciBridgeDataB(A) readb((volatile void __iomem *) __region_CS1 + 0x800 + (A)) | |
56 | #define __get_PciBridgeDataW(A) readw((volatile void __iomem *) __region_CS1 + 0x800 + (A)) | |
57 | #define __get_PciBridgeDataL(A) readl((volatile void __iomem *) __region_CS1 + 0x800 + (A)) | |
58 | ||
59 | #define __set_PciBridgeDataB(A,V) writeb((V), (volatile void __iomem *) __region_CS1 + 0x800 + (A)) | |
60 | #define __set_PciBridgeDataW(A,V) writew((V), (volatile void __iomem *) __region_CS1 + 0x800 + (A)) | |
61 | #define __set_PciBridgeDataL(A,V) writel((V), (volatile void __iomem *) __region_CS1 + 0x800 + (A)) | |
62 | ||
63 | static inline int __query(const struct pci_dev *dev) | |
64 | { | |
65 | // return dev->bus->number==0 && (dev->devfn==PCI_DEVFN(0,0)); | |
66 | // return dev->bus->number==1; | |
67 | // return dev->bus->number==0 && | |
68 | // (dev->devfn==PCI_DEVFN(2,0) || dev->devfn==PCI_DEVFN(3,0)); | |
69 | return 0; | |
70 | } | |
71 | ||
72 | /*****************************************************************************/ | |
73 | /* | |
74 | * | |
75 | */ | |
76 | static int pci_frv_read_config(struct pci_bus *bus, unsigned int devfn, int where, int size, | |
77 | u32 *val) | |
78 | { | |
79 | u32 _value; | |
80 | ||
81 | if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) { | |
82 | _value = __get_PciBridgeDataL(where & ~3); | |
83 | } | |
84 | else { | |
85 | __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where)); | |
86 | _value = __get_PciCfgDataL(where & ~3); | |
87 | } | |
88 | ||
89 | switch (size) { | |
90 | case 1: | |
91 | _value = _value >> ((where & 3) * 8); | |
92 | break; | |
93 | ||
94 | case 2: | |
95 | _value = _value >> ((where & 2) * 8); | |
96 | break; | |
97 | ||
98 | case 4: | |
99 | break; | |
100 | ||
101 | default: | |
102 | BUG(); | |
103 | } | |
104 | ||
105 | *val = _value; | |
106 | return PCIBIOS_SUCCESSFUL; | |
107 | } | |
108 | ||
109 | static int pci_frv_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size, | |
110 | u32 value) | |
111 | { | |
112 | switch (size) { | |
113 | case 1: | |
114 | if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) { | |
115 | __set_PciBridgeDataB(where, value); | |
116 | } | |
117 | else { | |
118 | __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where)); | |
119 | __set_PciCfgDataB(where, value); | |
120 | } | |
121 | break; | |
122 | ||
123 | case 2: | |
124 | if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) { | |
125 | __set_PciBridgeDataW(where, value); | |
126 | } | |
127 | else { | |
128 | __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where)); | |
129 | __set_PciCfgDataW(where, value); | |
130 | } | |
131 | break; | |
132 | ||
133 | case 4: | |
134 | if (bus->number == 0 && devfn == PCI_DEVFN(0, 0)) { | |
135 | __set_PciBridgeDataL(where, value); | |
136 | } | |
137 | else { | |
138 | __set_PciCfgAddr(CONFIG_CMD(bus, devfn, where)); | |
139 | __set_PciCfgDataL(where, value); | |
140 | } | |
141 | break; | |
142 | ||
143 | default: | |
144 | BUG(); | |
145 | } | |
146 | ||
147 | return PCIBIOS_SUCCESSFUL; | |
148 | } | |
149 | ||
150 | static struct pci_ops pci_direct_frv = { | |
151 | pci_frv_read_config, | |
152 | pci_frv_write_config, | |
153 | }; | |
154 | ||
155 | /* | |
156 | * Before we decide to use direct hardware access mechanisms, we try to do some | |
157 | * trivial checks to ensure it at least _seems_ to be working -- we just test | |
158 | * whether bus 00 contains a host bridge (this is similar to checking | |
159 | * techniques used in XFree86, but ours should be more reliable since we | |
160 | * attempt to make use of direct access hints provided by the PCI BIOS). | |
161 | * | |
162 | * This should be close to trivial, but it isn't, because there are buggy | |
163 | * chipsets (yes, you guessed it, by Intel and Compaq) that have no class ID. | |
164 | */ | |
165 | static int __init pci_sanity_check(struct pci_ops *o) | |
166 | { | |
167 | struct pci_bus bus; /* Fake bus and device */ | |
168 | u32 id; | |
169 | ||
170 | bus.number = 0; | |
171 | ||
172 | if (o->read(&bus, 0, PCI_VENDOR_ID, 4, &id) == PCIBIOS_SUCCESSFUL) { | |
173 | printk("PCI: VDK Bridge device:vendor: %08x\n", id); | |
174 | if (id == 0x200e10cf) | |
175 | return 1; | |
176 | } | |
177 | ||
178 | printk("PCI: VDK Bridge: Sanity check failed\n"); | |
179 | return 0; | |
180 | } | |
181 | ||
182 | static struct pci_ops * __init pci_check_direct(void) | |
183 | { | |
184 | unsigned long flags; | |
185 | ||
186 | local_irq_save(flags); | |
187 | ||
188 | /* check if access works */ | |
189 | if (pci_sanity_check(&pci_direct_frv)) { | |
190 | local_irq_restore(flags); | |
191 | printk("PCI: Using configuration frv\n"); | |
192 | // request_mem_region(0xBE040000, 256, "FRV bridge"); | |
193 | // request_mem_region(0xBFFFFFF4, 12, "PCI frv"); | |
194 | return &pci_direct_frv; | |
195 | } | |
196 | ||
197 | local_irq_restore(flags); | |
198 | return NULL; | |
199 | } | |
200 | ||
201 | /* | |
202 | * Several buggy motherboards address only 16 devices and mirror | |
203 | * them to next 16 IDs. We try to detect this `feature' on all | |
204 | * primary buses (those containing host bridges as they are | |
205 | * expected to be unique) and remove the ghost devices. | |
206 | */ | |
207 | ||
208 | static void __init pcibios_fixup_ghosts(struct pci_bus *b) | |
209 | { | |
210 | struct list_head *ln, *mn; | |
211 | struct pci_dev *d, *e; | |
212 | int mirror = PCI_DEVFN(16,0); | |
213 | int seen_host_bridge = 0; | |
214 | int i; | |
215 | ||
216 | for (ln=b->devices.next; ln != &b->devices; ln=ln->next) { | |
217 | d = pci_dev_b(ln); | |
218 | if ((d->class >> 8) == PCI_CLASS_BRIDGE_HOST) | |
219 | seen_host_bridge++; | |
220 | for (mn=ln->next; mn != &b->devices; mn=mn->next) { | |
221 | e = pci_dev_b(mn); | |
222 | if (e->devfn != d->devfn + mirror || | |
223 | e->vendor != d->vendor || | |
224 | e->device != d->device || | |
225 | e->class != d->class) | |
226 | continue; | |
227 | for(i=0; i<PCI_NUM_RESOURCES; i++) | |
228 | if (e->resource[i].start != d->resource[i].start || | |
229 | e->resource[i].end != d->resource[i].end || | |
230 | e->resource[i].flags != d->resource[i].flags) | |
231 | continue; | |
232 | break; | |
233 | } | |
234 | if (mn == &b->devices) | |
235 | return; | |
236 | } | |
237 | if (!seen_host_bridge) | |
238 | return; | |
239 | printk("PCI: Ignoring ghost devices on bus %02x\n", b->number); | |
240 | ||
241 | ln = &b->devices; | |
242 | while (ln->next != &b->devices) { | |
243 | d = pci_dev_b(ln->next); | |
244 | if (d->devfn >= mirror) { | |
245 | list_del(&d->global_list); | |
246 | list_del(&d->bus_list); | |
247 | kfree(d); | |
248 | } else | |
249 | ln = ln->next; | |
250 | } | |
251 | } | |
252 | ||
253 | /* | |
254 | * Discover remaining PCI buses in case there are peer host bridges. | |
255 | * We use the number of last PCI bus provided by the PCI BIOS. | |
256 | */ | |
257 | static void __init pcibios_fixup_peer_bridges(void) | |
258 | { | |
259 | struct pci_bus bus; | |
260 | struct pci_dev dev; | |
261 | int n; | |
262 | u16 l; | |
263 | ||
264 | if (pcibios_last_bus <= 0 || pcibios_last_bus >= 0xff) | |
265 | return; | |
266 | printk("PCI: Peer bridge fixup\n"); | |
267 | for (n=0; n <= pcibios_last_bus; n++) { | |
268 | if (pci_find_bus(0, n)) | |
269 | continue; | |
270 | bus.number = n; | |
271 | bus.ops = pci_root_ops; | |
272 | dev.bus = &bus; | |
273 | for(dev.devfn=0; dev.devfn<256; dev.devfn += 8) | |
274 | if (!pci_read_config_word(&dev, PCI_VENDOR_ID, &l) && | |
275 | l != 0x0000 && l != 0xffff) { | |
276 | printk("Found device at %02x:%02x [%04x]\n", n, dev.devfn, l); | |
277 | printk("PCI: Discovered peer bus %02x\n", n); | |
278 | pci_scan_bus(n, pci_root_ops, NULL); | |
279 | break; | |
280 | } | |
281 | } | |
282 | } | |
283 | ||
284 | /* | |
285 | * Exceptions for specific devices. Usually work-arounds for fatal design flaws. | |
286 | */ | |
287 | ||
288 | static void __init pci_fixup_umc_ide(struct pci_dev *d) | |
289 | { | |
290 | /* | |
291 | * UM8886BF IDE controller sets region type bits incorrectly, | |
292 | * therefore they look like memory despite of them being I/O. | |
293 | */ | |
294 | int i; | |
295 | ||
296 | printk("PCI: Fixing base address flags for device %s\n", pci_name(d)); | |
297 | for(i=0; i<4; i++) | |
298 | d->resource[i].flags |= PCI_BASE_ADDRESS_SPACE_IO; | |
299 | } | |
300 | ||
301 | static void __init pci_fixup_ide_bases(struct pci_dev *d) | |
302 | { | |
303 | int i; | |
304 | ||
305 | /* | |
306 | * PCI IDE controllers use non-standard I/O port decoding, respect it. | |
307 | */ | |
308 | if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE) | |
309 | return; | |
310 | printk("PCI: IDE base address fixup for %s\n", pci_name(d)); | |
311 | for(i=0; i<4; i++) { | |
312 | struct resource *r = &d->resource[i]; | |
313 | if ((r->start & ~0x80) == 0x374) { | |
314 | r->start |= 2; | |
315 | r->end = r->start; | |
316 | } | |
317 | } | |
318 | } | |
319 | ||
320 | static void __init pci_fixup_ide_trash(struct pci_dev *d) | |
321 | { | |
322 | int i; | |
323 | ||
324 | /* | |
325 | * There exist PCI IDE controllers which have utter garbage | |
326 | * in first four base registers. Ignore that. | |
327 | */ | |
328 | printk("PCI: IDE base address trash cleared for %s\n", pci_name(d)); | |
329 | for(i=0; i<4; i++) | |
330 | d->resource[i].start = d->resource[i].end = d->resource[i].flags = 0; | |
331 | } | |
332 | ||
333 | static void __devinit pci_fixup_latency(struct pci_dev *d) | |
334 | { | |
335 | /* | |
336 | * SiS 5597 and 5598 chipsets require latency timer set to | |
337 | * at most 32 to avoid lockups. | |
338 | */ | |
339 | DBG("PCI: Setting max latency to 32\n"); | |
340 | pcibios_max_latency = 32; | |
341 | } | |
342 | ||
343 | DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_UMC, PCI_DEVICE_ID_UMC_UM8886BF, pci_fixup_umc_ide); | |
344 | DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5513, pci_fixup_ide_trash); | |
345 | DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5597, pci_fixup_latency); | |
346 | DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5598, pci_fixup_latency); | |
347 | DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases); | |
348 | ||
349 | /* | |
350 | * Called after each bus is probed, but before its children | |
351 | * are examined. | |
352 | */ | |
353 | ||
354 | void __init pcibios_fixup_bus(struct pci_bus *bus) | |
355 | { | |
356 | #if 0 | |
357 | printk("### PCIBIOS_FIXUP_BUS(%d)\n",bus->number); | |
358 | #endif | |
359 | pcibios_fixup_ghosts(bus); | |
360 | pci_read_bridge_bases(bus); | |
361 | ||
362 | if (bus->number == 0) { | |
363 | struct list_head *ln; | |
364 | struct pci_dev *dev; | |
365 | for (ln=bus->devices.next; ln != &bus->devices; ln=ln->next) { | |
366 | dev = pci_dev_b(ln); | |
367 | if (dev->devfn == 0) { | |
368 | dev->resource[0].start = 0; | |
369 | dev->resource[0].end = 0; | |
370 | } | |
371 | } | |
372 | } | |
373 | } | |
374 | ||
375 | /* | |
376 | * Initialization. Try all known PCI access methods. Note that we support | |
377 | * using both PCI BIOS and direct access: in such cases, we use I/O ports | |
378 | * to access config space, but we still keep BIOS order of cards to be | |
379 | * compatible with 2.0.X. This should go away some day. | |
380 | */ | |
381 | ||
382 | int __init pcibios_init(void) | |
383 | { | |
384 | struct pci_ops *dir = NULL; | |
385 | ||
386 | if (!mb93090_mb00_detected) | |
387 | return -ENXIO; | |
388 | ||
389 | __reg_MB86943_sl_ctl |= MB86943_SL_CTL_DRCT_MASTER_SWAP | MB86943_SL_CTL_DRCT_SLAVE_SWAP; | |
390 | ||
391 | __reg_MB86943_ecs_base(1) = ((__region_CS2 + 0x01000000) >> 9) | 0x08000000; | |
392 | __reg_MB86943_ecs_base(2) = ((__region_CS2 + 0x00000000) >> 9) | 0x08000000; | |
393 | ||
394 | *(volatile uint32_t *) (__region_CS1 + 0x848) = 0xe0000000; | |
395 | *(volatile uint32_t *) (__region_CS1 + 0x8b8) = 0x00000000; | |
396 | ||
397 | __reg_MB86943_sl_pci_io_base = (__region_CS2 + 0x04000000) >> 9; | |
398 | __reg_MB86943_sl_pci_mem_base = (__region_CS2 + 0x08000000) >> 9; | |
399 | __reg_MB86943_pci_sl_io_base = __region_CS2 + 0x04000000; | |
400 | __reg_MB86943_pci_sl_mem_base = __region_CS2 + 0x08000000; | |
401 | mb(); | |
402 | ||
403 | *(volatile unsigned long *)(__region_CS2+0x01300014) == 1; | |
404 | ||
405 | ioport_resource.start = (__reg_MB86943_sl_pci_io_base << 9) & 0xfffffc00; | |
406 | ioport_resource.end = (__reg_MB86943_sl_pci_io_range << 9) | 0x3ff; | |
407 | ioport_resource.end += ioport_resource.start; | |
408 | ||
409 | printk("PCI IO window: %08lx-%08lx\n", ioport_resource.start, ioport_resource.end); | |
410 | ||
411 | iomem_resource.start = (__reg_MB86943_sl_pci_mem_base << 9) & 0xfffffc00; | |
412 | ||
413 | /* Reserve somewhere to write to flush posted writes. */ | |
414 | iomem_resource.start += 0x400; | |
415 | ||
416 | iomem_resource.end = (__reg_MB86943_sl_pci_mem_range << 9) | 0x3ff; | |
417 | iomem_resource.end += iomem_resource.start; | |
418 | ||
419 | printk("PCI MEM window: %08lx-%08lx\n", iomem_resource.start, iomem_resource.end); | |
420 | printk("PCI DMA memory: %08lx-%08lx\n", dma_coherent_mem_start, dma_coherent_mem_end); | |
421 | ||
422 | if (!pci_probe) | |
423 | return -ENXIO; | |
424 | ||
425 | dir = pci_check_direct(); | |
426 | if (dir) | |
427 | pci_root_ops = dir; | |
428 | else { | |
429 | printk("PCI: No PCI bus detected\n"); | |
430 | return -ENXIO; | |
431 | } | |
432 | ||
433 | printk("PCI: Probing PCI hardware\n"); | |
434 | pci_root_bus = pci_scan_bus(0, pci_root_ops, NULL); | |
435 | ||
436 | pcibios_irq_init(); | |
437 | pcibios_fixup_peer_bridges(); | |
438 | pcibios_fixup_irqs(); | |
439 | pcibios_resource_survey(); | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | arch_initcall(pcibios_init); | |
445 | ||
446 | char * __init pcibios_setup(char *str) | |
447 | { | |
448 | if (!strcmp(str, "off")) { | |
449 | pci_probe = 0; | |
450 | return NULL; | |
451 | } else if (!strncmp(str, "lastbus=", 8)) { | |
452 | pcibios_last_bus = simple_strtol(str+8, NULL, 0); | |
453 | return NULL; | |
454 | } | |
455 | return str; | |
456 | } | |
457 | ||
458 | int pcibios_enable_device(struct pci_dev *dev, int mask) | |
459 | { | |
460 | int err; | |
461 | ||
462 | if ((err = pcibios_enable_resources(dev, mask)) < 0) | |
463 | return err; | |
464 | pcibios_enable_irq(dev); | |
465 | return 0; | |
466 | } |