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
35 void pciauto_region_init(struct pci_region* res)
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.
42 res->bus_lower = res->bus_start ? res->bus_start : 0x1000;
45 void pciauto_region_align(struct pci_region *res, unsigned long size)
47 res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1;
50 int pciauto_region_allocate(struct pci_region* res, unsigned int size, unsigned int *bar)
55 DEBUGF("No resource");
59 addr = ((res->bus_lower - 1) | (size - 1)) + 1;
61 if (addr - res->bus_start + size > res->size) {
62 DEBUGF("No room in resource");
66 res->bus_lower = addr + size;
68 DEBUGF("address=0x%lx", addr);
82 void pciauto_setup_device(struct pci_controller *hose,
83 pci_dev_t dev, int bars_num,
84 struct pci_region *mem,
85 struct pci_region *prefetch,
86 struct pci_region *io)
88 unsigned int bar_value, bar_response, bar_size;
89 unsigned int cmdstat = 0;
90 struct pci_region *bar_res;
94 pci_hose_read_config_dword(hose, dev, PCI_COMMAND, &cmdstat);
95 cmdstat = (cmdstat & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) | PCI_COMMAND_MASTER;
97 for (bar = PCI_BASE_ADDRESS_0; bar <= PCI_BASE_ADDRESS_0 + (bars_num*4); bar += 4) {
98 /* Tickle the BAR and get the response */
99 pci_hose_write_config_dword(hose, dev, bar, 0xffffffff);
100 pci_hose_read_config_dword(hose, dev, bar, &bar_response);
102 /* If BAR is not implemented go to the next BAR */
108 /* Check the BAR type and set our address mask */
109 if (bar_response & PCI_BASE_ADDRESS_SPACE) {
110 bar_size = ((~(bar_response & PCI_BASE_ADDRESS_IO_MASK))
114 DEBUGF("PCI Autoconfig: BAR %d, I/O, size=0x%x, ", bar_nr, bar_size);
116 if ( (bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
117 PCI_BASE_ADDRESS_MEM_TYPE_64)
120 bar_size = ~(bar_response & PCI_BASE_ADDRESS_MEM_MASK) + 1;
121 if (prefetch && (bar_response & PCI_BASE_ADDRESS_MEM_PREFETCH))
126 DEBUGF("PCI Autoconfig: BAR %d, Mem, size=0x%x, ", bar_nr, bar_size);
129 if (pciauto_region_allocate(bar_res, bar_size, &bar_value) == 0) {
130 /* Write it out and update our limit */
131 pci_hose_write_config_dword(hose, dev, bar, bar_value);
134 * If we are a 64-bit decoder then increment to the
135 * upper 32 bits of the bar and force it to locate
136 * in the lower 4GB of memory.
140 pci_hose_write_config_dword(hose, dev, bar, 0x00000000);
143 cmdstat |= (bar_response & PCI_BASE_ADDRESS_SPACE) ?
144 PCI_COMMAND_IO : PCI_COMMAND_MEMORY;
152 pci_hose_write_config_dword(hose, dev, PCI_COMMAND, cmdstat);
153 pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE, 0x08);
154 pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);
157 static void pciauto_prescan_setup_bridge(struct pci_controller *hose,
158 pci_dev_t dev, int sub_bus)
160 struct pci_region *pci_mem = hose->pci_mem;
161 struct pci_region *pci_prefetch = hose->pci_prefetch;
162 struct pci_region *pci_io = hose->pci_io;
163 unsigned int cmdstat;
165 pci_hose_read_config_dword(hose, dev, PCI_COMMAND, &cmdstat);
167 /* Configure bus number registers */
168 pci_hose_write_config_byte(hose, dev, PCI_PRIMARY_BUS, PCI_BUS(dev));
169 pci_hose_write_config_byte(hose, dev, PCI_SECONDARY_BUS, sub_bus);
170 pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS, 0xff);
173 /* Round memory allocator to 1MB boundary */
174 pciauto_region_align(pci_mem, 0x100000);
176 /* Set up memory and I/O filter limits, assume 32-bit I/O space */
177 pci_hose_write_config_word(hose, dev, PCI_MEMORY_BASE,
178 (pci_mem->bus_lower & 0xfff00000) >> 16);
180 cmdstat |= PCI_COMMAND_MEMORY;
184 /* Round memory allocator to 1MB boundary */
185 pciauto_region_align(pci_prefetch, 0x100000);
187 /* Set up memory and I/O filter limits, assume 32-bit I/O space */
188 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE,
189 (pci_prefetch->bus_lower & 0xfff00000) >> 16);
191 cmdstat |= PCI_COMMAND_MEMORY;
193 /* We don't support prefetchable memory for now, so disable */
194 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE, 0x1000);
195 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT, 0x0);
199 /* Round I/O allocator to 4KB boundary */
200 pciauto_region_align(pci_io, 0x1000);
202 pci_hose_write_config_byte(hose, dev, PCI_IO_BASE,
203 (pci_io->bus_lower & 0x0000f000) >> 8);
204 pci_hose_write_config_word(hose, dev, PCI_IO_BASE_UPPER16,
205 (pci_io->bus_lower & 0xffff0000) >> 16);
207 cmdstat |= PCI_COMMAND_IO;
210 /* Enable memory and I/O accesses, enable bus master */
211 pci_hose_write_config_dword(hose, dev, PCI_COMMAND, cmdstat | PCI_COMMAND_MASTER);
214 static void pciauto_postscan_setup_bridge(struct pci_controller *hose,
215 pci_dev_t dev, int sub_bus)
217 struct pci_region *pci_mem = hose->pci_mem;
218 struct pci_region *pci_prefetch = hose->pci_prefetch;
219 struct pci_region *pci_io = hose->pci_io;
221 /* Configure bus number registers */
222 pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS, sub_bus);
225 /* Round memory allocator to 1MB boundary */
226 pciauto_region_align(pci_mem, 0x100000);
228 pci_hose_write_config_word(hose, dev, PCI_MEMORY_LIMIT,
229 (pci_mem->bus_lower-1) >> 16);
233 /* Round memory allocator to 1MB boundary */
234 pciauto_region_align(pci_prefetch, 0x100000);
236 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT,
237 (pci_prefetch->bus_lower-1) >> 16);
241 /* Round I/O allocator to 4KB boundary */
242 pciauto_region_align(pci_io, 0x1000);
244 pci_hose_write_config_byte(hose, dev, PCI_IO_LIMIT,
245 ((pci_io->bus_lower-1) & 0x0000f000) >> 8);
246 pci_hose_write_config_word(hose, dev, PCI_IO_LIMIT_UPPER16,
247 ((pci_io->bus_lower-1) & 0xffff0000) >> 16);
255 void pciauto_config_init(struct pci_controller *hose)
259 hose->pci_io = hose->pci_mem = NULL;
261 for (i=0; i<hose->region_count; i++) {
262 switch(hose->regions[i].flags) {
265 hose->pci_io->size < hose->regions[i].size)
266 hose->pci_io = hose->regions + i;
269 if (!hose->pci_mem ||
270 hose->pci_mem->size < hose->regions[i].size)
271 hose->pci_mem = hose->regions + i;
273 case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
274 if (!hose->pci_prefetch ||
275 hose->pci_prefetch->size < hose->regions[i].size)
276 hose->pci_prefetch = hose->regions + i;
283 pciauto_region_init(hose->pci_mem);
285 DEBUGF("PCI Autoconfig: Memory region: [%lx-%lx]\n",
286 hose->pci_mem->bus_start,
287 hose->pci_mem->bus_start + hose->pci_mem->size - 1);
290 if (hose->pci_prefetch) {
291 pciauto_region_init(hose->pci_prefetch);
293 DEBUGF("PCI Autoconfig: Prefetchable Memory region: [%lx-%lx]\n",
294 hose->pci_prefetch->bus_start,
295 hose->pci_prefetch->bus_start + hose->pci_prefetch->size - 1);
299 pciauto_region_init(hose->pci_io);
301 DEBUGF("PCI Autoconfig: I/O region: [%lx-%lx]\n",
302 hose->pci_io->bus_start,
303 hose->pci_io->bus_start + hose->pci_io->size - 1);
307 /* HJF: Changed this to return int. I think this is required
308 * to get the correct result when scanning bridges
310 int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev)
312 unsigned int sub_bus = PCI_BUS(dev);
313 unsigned short class;
314 unsigned char prg_iface;
317 pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);
320 case PCI_CLASS_BRIDGE_PCI:
321 hose->current_busno++;
322 pciauto_setup_device(hose, dev, 2, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
324 DEBUGF("PCI Autoconfig: Found P2P bridge, device %d\n", PCI_DEV(dev));
326 /* Passing in current_busno allows for sibling P2P bridges */
327 pciauto_prescan_setup_bridge(hose, dev, hose->current_busno);
329 * need to figure out if this is a subordinate bridge on the bus
330 * to be able to properly set the pri/sec/sub bridge registers.
332 n = pci_hose_scan_bus(hose, hose->current_busno);
334 /* figure out the deepest we've gone for this leg */
335 sub_bus = max(n, sub_bus);
336 pciauto_postscan_setup_bridge(hose, dev, sub_bus);
338 sub_bus = hose->current_busno;
341 case PCI_CLASS_STORAGE_IDE:
342 pci_hose_read_config_byte(hose, dev, PCI_CLASS_PROG, &prg_iface);
343 if (!(prg_iface & PCIAUTO_IDE_MODE_MASK)) {
344 DEBUGF("PCI Autoconfig: Skipping legacy mode IDE controller\n");
348 pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
351 case PCI_CLASS_BRIDGE_CARDBUS:
352 /* just do a minimal setup of the bridge, let the OS take care of the rest */
353 pciauto_setup_device(hose, dev, 0, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
355 DEBUGF("PCI Autoconfig: Found P2CardBus bridge, device %d\n", PCI_DEV(dev));
357 hose->current_busno++;
360 #ifdef CONFIG_MPC5200
361 case PCI_CLASS_BRIDGE_OTHER:
362 DEBUGF("PCI Autoconfig: Skipping bridge device %d\n",
366 #ifdef CONFIG_MPC834X
367 case PCI_CLASS_BRIDGE_OTHER:
369 * The host/PCI bridge 1 seems broken in 8349 - it presents
370 * itself as 'PCI_CLASS_BRIDGE_OTHER' and appears as an _agent_
371 * device claiming resources io/mem/irq.. we only allow for
372 * the PIMMR window to be allocated (BAR0 - 1MB size)
374 DEBUGF("PCI Autoconfig: Broken bridge found, only minimal config\n");
375 pciauto_setup_device(hose, dev, 0, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
379 pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
386 #endif /* CONFIG_PCI */