2 * arch/ppc/kernel/pci_auto.c
4 * PCI autoconfiguration library
6 * Author: Matt Porter <mporter@mvista.com>
8 * Copyright 2000 MontaVista Software Inc.
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
24 #define DEBUGF(x...) printf(x)
29 #define PCIAUTO_IDE_MODE_MASK 0x05
31 /* the user can define CFG_PCI_CACHE_LINE_SIZE to avoid problems */
32 #ifndef CFG_PCI_CACHE_LINE_SIZE
33 #define CFG_PCI_CACHE_LINE_SIZE 8
40 void pciauto_region_init(struct pci_region* res)
43 * Avoid allocating PCI resources from address 0 -- this is illegal
44 * according to PCI 2.1 and moreover, this is known to cause Linux IDE
45 * drivers to fail. Use a reasonable starting value of 0x1000 instead.
47 res->bus_lower = res->bus_start ? res->bus_start : 0x1000;
50 void pciauto_region_align(struct pci_region *res, unsigned long size)
52 res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1;
55 int pciauto_region_allocate(struct pci_region* res, unsigned int size, unsigned int *bar)
60 DEBUGF("No resource");
64 addr = ((res->bus_lower - 1) | (size - 1)) + 1;
66 if (addr - res->bus_start + size > res->size) {
67 DEBUGF("No room in resource");
71 res->bus_lower = addr + size;
73 DEBUGF("address=0x%lx bus_lower=%x", addr, res->bus_lower);
87 void pciauto_setup_device(struct pci_controller *hose,
88 pci_dev_t dev, int bars_num,
89 struct pci_region *mem,
90 struct pci_region *prefetch,
91 struct pci_region *io)
93 unsigned int bar_value, bar_response, bar_size;
94 unsigned int cmdstat = 0;
95 struct pci_region *bar_res;
99 pci_hose_read_config_dword(hose, dev, PCI_COMMAND, &cmdstat);
100 cmdstat = (cmdstat & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) | PCI_COMMAND_MASTER;
102 for (bar = PCI_BASE_ADDRESS_0; bar < PCI_BASE_ADDRESS_0 + (bars_num*4); bar += 4) {
103 /* Tickle the BAR and get the response */
104 pci_hose_write_config_dword(hose, dev, bar, 0xffffffff);
105 pci_hose_read_config_dword(hose, dev, bar, &bar_response);
107 /* If BAR is not implemented go to the next BAR */
113 /* Check the BAR type and set our address mask */
114 if (bar_response & PCI_BASE_ADDRESS_SPACE) {
115 bar_size = ((~(bar_response & PCI_BASE_ADDRESS_IO_MASK))
119 DEBUGF("PCI Autoconfig: BAR %d, I/O, size=0x%x, ", bar_nr, bar_size);
121 if ( (bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
122 PCI_BASE_ADDRESS_MEM_TYPE_64)
125 bar_size = ~(bar_response & PCI_BASE_ADDRESS_MEM_MASK) + 1;
126 if (prefetch && (bar_response & PCI_BASE_ADDRESS_MEM_PREFETCH))
131 DEBUGF("PCI Autoconfig: BAR %d, Mem, size=0x%x, ", bar_nr, bar_size);
134 if (pciauto_region_allocate(bar_res, bar_size, &bar_value) == 0) {
135 /* Write it out and update our limit */
136 pci_hose_write_config_dword(hose, dev, bar, bar_value);
139 * If we are a 64-bit decoder then increment to the
140 * upper 32 bits of the bar and force it to locate
141 * in the lower 4GB of memory.
145 pci_hose_write_config_dword(hose, dev, bar, 0x00000000);
148 cmdstat |= (bar_response & PCI_BASE_ADDRESS_SPACE) ?
149 PCI_COMMAND_IO : PCI_COMMAND_MEMORY;
157 pci_hose_write_config_dword(hose, dev, PCI_COMMAND, cmdstat);
158 pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE,
159 CFG_PCI_CACHE_LINE_SIZE);
160 pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);
163 void pciauto_prescan_setup_bridge(struct pci_controller *hose,
164 pci_dev_t dev, int sub_bus)
166 struct pci_region *pci_mem = hose->pci_mem;
167 struct pci_region *pci_prefetch = hose->pci_prefetch;
168 struct pci_region *pci_io = hose->pci_io;
169 unsigned int cmdstat;
171 pci_hose_read_config_dword(hose, dev, PCI_COMMAND, &cmdstat);
173 /* Configure bus number registers */
174 pci_hose_write_config_byte(hose, dev, PCI_PRIMARY_BUS,
175 PCI_BUS(dev) - hose->first_busno);
176 pci_hose_write_config_byte(hose, dev, PCI_SECONDARY_BUS,
177 sub_bus - hose->first_busno);
178 pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS, 0xff);
181 /* Round memory allocator to 1MB boundary */
182 pciauto_region_align(pci_mem, 0x100000);
184 /* Set up memory and I/O filter limits, assume 32-bit I/O space */
185 pci_hose_write_config_word(hose, dev, PCI_MEMORY_BASE,
186 (pci_mem->bus_lower & 0xfff00000) >> 16);
188 cmdstat |= PCI_COMMAND_MEMORY;
192 /* Round memory allocator to 1MB boundary */
193 pciauto_region_align(pci_prefetch, 0x100000);
195 /* Set up memory and I/O filter limits, assume 32-bit I/O space */
196 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE,
197 (pci_prefetch->bus_lower & 0xfff00000) >> 16);
199 cmdstat |= PCI_COMMAND_MEMORY;
201 /* We don't support prefetchable memory for now, so disable */
202 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE, 0x1000);
203 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT, 0x0);
207 /* Round I/O allocator to 4KB boundary */
208 pciauto_region_align(pci_io, 0x1000);
210 pci_hose_write_config_byte(hose, dev, PCI_IO_BASE,
211 (pci_io->bus_lower & 0x0000f000) >> 8);
212 pci_hose_write_config_word(hose, dev, PCI_IO_BASE_UPPER16,
213 (pci_io->bus_lower & 0xffff0000) >> 16);
215 cmdstat |= PCI_COMMAND_IO;
218 /* Enable memory and I/O accesses, enable bus master */
219 pci_hose_write_config_dword(hose, dev, PCI_COMMAND, cmdstat | PCI_COMMAND_MASTER);
222 void pciauto_postscan_setup_bridge(struct pci_controller *hose,
223 pci_dev_t dev, int sub_bus)
225 struct pci_region *pci_mem = hose->pci_mem;
226 struct pci_region *pci_prefetch = hose->pci_prefetch;
227 struct pci_region *pci_io = hose->pci_io;
229 /* Configure bus number registers */
230 pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS,
231 sub_bus - hose->first_busno);
234 /* Round memory allocator to 1MB boundary */
235 pciauto_region_align(pci_mem, 0x100000);
237 pci_hose_write_config_word(hose, dev, PCI_MEMORY_LIMIT,
238 (pci_mem->bus_lower-1) >> 16);
242 /* Round memory allocator to 1MB boundary */
243 pciauto_region_align(pci_prefetch, 0x100000);
245 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT,
246 (pci_prefetch->bus_lower-1) >> 16);
250 /* Round I/O allocator to 4KB boundary */
251 pciauto_region_align(pci_io, 0x1000);
253 pci_hose_write_config_byte(hose, dev, PCI_IO_LIMIT,
254 ((pci_io->bus_lower-1) & 0x0000f000) >> 8);
255 pci_hose_write_config_word(hose, dev, PCI_IO_LIMIT_UPPER16,
256 ((pci_io->bus_lower-1) & 0xffff0000) >> 16);
264 void pciauto_config_init(struct pci_controller *hose)
268 hose->pci_io = hose->pci_mem = NULL;
270 for (i=0; i<hose->region_count; i++) {
271 switch(hose->regions[i].flags) {
274 hose->pci_io->size < hose->regions[i].size)
275 hose->pci_io = hose->regions + i;
278 if (!hose->pci_mem ||
279 hose->pci_mem->size < hose->regions[i].size)
280 hose->pci_mem = hose->regions + i;
282 case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
283 if (!hose->pci_prefetch ||
284 hose->pci_prefetch->size < hose->regions[i].size)
285 hose->pci_prefetch = hose->regions + i;
292 pciauto_region_init(hose->pci_mem);
294 DEBUGF("PCI Autoconfig: Bus Memory region: [%lx-%lx],\n"
295 "\t\tPhysical Memory [%x-%x]\n",
296 hose->pci_mem->bus_start,
297 hose->pci_mem->bus_start + hose->pci_mem->size - 1,
298 hose->pci_mem->phys_start,
299 hose->pci_mem->phys_start + hose->pci_mem->size - 1);
302 if (hose->pci_prefetch) {
303 pciauto_region_init(hose->pci_prefetch);
305 DEBUGF("PCI Autoconfig: Bus Prefetchable Mem: [%lx-%lx],\n"
306 "\t\tPhysical Memory [%x-%x]\n",
307 hose->pci_prefetch->bus_start,
308 hose->pci_prefetch->bus_start + hose->pci_prefetch->size - 1,
309 hose->pci_prefetch->phys_start,
310 hose->pci_prefetch->phys_start +
311 hose->pci_prefetch->size - 1);
315 pciauto_region_init(hose->pci_io);
317 DEBUGF("PCI Autoconfig: Bus I/O region: [%lx-%lx],\n"
318 "\t\tPhysical Memory: [%x-%x]\n",
319 hose->pci_io->bus_start,
320 hose->pci_io->bus_start + hose->pci_io->size - 1,
321 hose->pci_io->phys_start,
322 hose->pci_io->phys_start + hose->pci_io->size - 1);
327 /* HJF: Changed this to return int. I think this is required
328 * to get the correct result when scanning bridges
330 int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev)
332 unsigned int sub_bus = PCI_BUS(dev);
333 unsigned short class;
334 unsigned char prg_iface;
337 pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);
340 case PCI_CLASS_PROCESSOR_POWERPC: /* an agent or end-point */
341 DEBUGF("PCI AutoConfig: Found PowerPC device\n");
342 pciauto_setup_device(hose, dev, 6, hose->pci_mem,
343 hose->pci_prefetch, hose->pci_io);
346 case PCI_CLASS_BRIDGE_PCI:
347 hose->current_busno++;
348 pciauto_setup_device(hose, dev, 2, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
350 DEBUGF("PCI Autoconfig: Found P2P bridge, device %d\n", PCI_DEV(dev));
352 /* Passing in current_busno allows for sibling P2P bridges */
353 pciauto_prescan_setup_bridge(hose, dev, hose->current_busno);
355 * need to figure out if this is a subordinate bridge on the bus
356 * to be able to properly set the pri/sec/sub bridge registers.
358 n = pci_hose_scan_bus(hose, hose->current_busno);
360 /* figure out the deepest we've gone for this leg */
361 sub_bus = max(n, sub_bus);
362 pciauto_postscan_setup_bridge(hose, dev, sub_bus);
364 sub_bus = hose->current_busno;
367 case PCI_CLASS_STORAGE_IDE:
368 pci_hose_read_config_byte(hose, dev, PCI_CLASS_PROG, &prg_iface);
369 if (!(prg_iface & PCIAUTO_IDE_MODE_MASK)) {
370 DEBUGF("PCI Autoconfig: Skipping legacy mode IDE controller\n");
374 pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
377 case PCI_CLASS_BRIDGE_CARDBUS:
378 /* just do a minimal setup of the bridge, let the OS take care of the rest */
379 pciauto_setup_device(hose, dev, 0, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
381 DEBUGF("PCI Autoconfig: Found P2CardBus bridge, device %d\n", PCI_DEV(dev));
383 hose->current_busno++;
386 #ifdef CONFIG_MPC5200
387 case PCI_CLASS_BRIDGE_OTHER:
388 DEBUGF("PCI Autoconfig: Skipping bridge device %d\n",
392 #ifdef CONFIG_MPC834X
393 case PCI_CLASS_BRIDGE_OTHER:
395 * The host/PCI bridge 1 seems broken in 8349 - it presents
396 * itself as 'PCI_CLASS_BRIDGE_OTHER' and appears as an _agent_
397 * device claiming resources io/mem/irq.. we only allow for
398 * the PIMMR window to be allocated (BAR0 - 1MB size)
400 DEBUGF("PCI Autoconfig: Broken bridge found, only minimal config\n");
401 pciauto_setup_device(hose, dev, 0, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
405 pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
412 #endif /* CONFIG_PCI */