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)
37 res->bus_lower = res->bus_start;
40 void pciauto_region_align(struct pci_region *res, unsigned long size)
42 res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1;
45 int pciauto_region_allocate(struct pci_region* res, unsigned int size, unsigned int *bar)
50 DEBUGF("No resource");
54 addr = ((res->bus_lower - 1) | (size - 1)) + 1;
56 if (addr - res->bus_start + size > res->size) {
57 DEBUGF("No room in resource");
61 res->bus_lower = addr + size;
63 DEBUGF("address=0x%lx", addr);
77 void pciauto_setup_device(struct pci_controller *hose,
78 pci_dev_t dev, int bars_num,
79 struct pci_region *mem,
80 struct pci_region *prefetch,
81 struct pci_region *io)
83 unsigned int bar_value, bar_response, bar_size;
84 unsigned int cmdstat = 0;
85 struct pci_region *bar_res;
89 pci_hose_read_config_dword(hose, dev, PCI_COMMAND, &cmdstat);
90 cmdstat = (cmdstat & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) | PCI_COMMAND_MASTER;
92 for (bar = PCI_BASE_ADDRESS_0; bar <= PCI_BASE_ADDRESS_0 + (bars_num*4); bar += 4) {
93 /* Tickle the BAR and get the response */
94 pci_hose_write_config_dword(hose, dev, bar, 0xffffffff);
95 pci_hose_read_config_dword(hose, dev, bar, &bar_response);
97 /* If BAR is not implemented go to the next BAR */
103 /* Check the BAR type and set our address mask */
104 if (bar_response & PCI_BASE_ADDRESS_SPACE) {
105 bar_size = ((~(bar_response & PCI_BASE_ADDRESS_IO_MASK))
109 DEBUGF("PCI Autoconfig: BAR %d, I/O, size=0x%x, ", bar_nr, bar_size);
111 if ( (bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
112 PCI_BASE_ADDRESS_MEM_TYPE_64)
115 bar_size = ~(bar_response & PCI_BASE_ADDRESS_MEM_MASK) + 1;
116 if (prefetch && (bar_response & PCI_BASE_ADDRESS_MEM_PREFETCH))
121 DEBUGF("PCI Autoconfig: BAR %d, Mem, size=0x%x, ", bar_nr, bar_size);
124 if (pciauto_region_allocate(bar_res, bar_size, &bar_value) == 0) {
125 /* Write it out and update our limit */
126 pci_hose_write_config_dword(hose, dev, bar, bar_value);
129 * If we are a 64-bit decoder then increment to the
130 * upper 32 bits of the bar and force it to locate
131 * in the lower 4GB of memory.
135 pci_hose_write_config_dword(hose, dev, bar, 0x00000000);
138 cmdstat |= (bar_response & PCI_BASE_ADDRESS_SPACE) ?
139 PCI_COMMAND_IO : PCI_COMMAND_MEMORY;
147 pci_hose_write_config_dword(hose, dev, PCI_COMMAND, cmdstat);
148 pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE, 0x08);
149 pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);
152 static void pciauto_prescan_setup_bridge(struct pci_controller *hose,
153 pci_dev_t dev, int sub_bus)
155 struct pci_region *pci_mem = hose->pci_mem;
156 struct pci_region *pci_prefetch = hose->pci_prefetch;
157 struct pci_region *pci_io = hose->pci_io;
158 unsigned int cmdstat;
160 pci_hose_read_config_dword(hose, dev, PCI_COMMAND, &cmdstat);
162 /* Configure bus number registers */
163 pci_hose_write_config_byte(hose, dev, PCI_PRIMARY_BUS, PCI_BUS(dev));
164 pci_hose_write_config_byte(hose, dev, PCI_SECONDARY_BUS, sub_bus);
165 pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS, 0xff);
168 /* Round memory allocator to 1MB boundary */
169 pciauto_region_align(pci_mem, 0x100000);
171 /* Set up memory and I/O filter limits, assume 32-bit I/O space */
172 pci_hose_write_config_word(hose, dev, PCI_MEMORY_BASE,
173 (pci_mem->bus_lower & 0xfff00000) >> 16);
175 cmdstat |= PCI_COMMAND_MEMORY;
179 /* Round memory allocator to 1MB boundary */
180 pciauto_region_align(pci_prefetch, 0x100000);
182 /* Set up memory and I/O filter limits, assume 32-bit I/O space */
183 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE,
184 (pci_prefetch->bus_lower & 0xfff00000) >> 16);
186 cmdstat |= PCI_COMMAND_MEMORY;
188 /* We don't support prefetchable memory for now, so disable */
189 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE, 0x1000);
190 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT, 0x0);
194 /* Round I/O allocator to 4KB boundary */
195 pciauto_region_align(pci_io, 0x1000);
197 pci_hose_write_config_byte(hose, dev, PCI_IO_BASE,
198 (pci_io->bus_lower & 0x0000f000) >> 8);
199 pci_hose_write_config_word(hose, dev, PCI_IO_BASE_UPPER16,
200 (pci_io->bus_lower & 0xffff0000) >> 16);
202 cmdstat |= PCI_COMMAND_IO;
205 /* Enable memory and I/O accesses, enable bus master */
206 pci_hose_write_config_dword(hose, dev, PCI_COMMAND, cmdstat | PCI_COMMAND_MASTER);
209 static void pciauto_postscan_setup_bridge(struct pci_controller *hose,
210 pci_dev_t dev, int sub_bus)
212 struct pci_region *pci_mem = hose->pci_mem;
213 struct pci_region *pci_prefetch = hose->pci_prefetch;
214 struct pci_region *pci_io = hose->pci_io;
216 /* Configure bus number registers */
217 pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS, sub_bus);
220 /* Round memory allocator to 1MB boundary */
221 pciauto_region_align(pci_mem, 0x100000);
223 pci_hose_write_config_word(hose, dev, PCI_MEMORY_LIMIT,
224 (pci_mem->bus_lower-1) >> 16);
228 /* Round memory allocator to 1MB boundary */
229 pciauto_region_align(pci_prefetch, 0x100000);
231 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT,
232 (pci_prefetch->bus_lower-1) >> 16);
236 /* Round I/O allocator to 4KB boundary */
237 pciauto_region_align(pci_io, 0x1000);
239 pci_hose_write_config_byte(hose, dev, PCI_IO_LIMIT,
240 ((pci_io->bus_lower-1) & 0x0000f000) >> 8);
241 pci_hose_write_config_word(hose, dev, PCI_IO_LIMIT_UPPER16,
242 ((pci_io->bus_lower-1) & 0xffff0000) >> 16);
250 void pciauto_config_init(struct pci_controller *hose)
254 hose->pci_io = hose->pci_mem = NULL;
256 for (i=0; i<hose->region_count; i++) {
257 switch(hose->regions[i].flags) {
260 hose->pci_io->size < hose->regions[i].size)
261 hose->pci_io = hose->regions + i;
264 if (!hose->pci_mem ||
265 hose->pci_mem->size < hose->regions[i].size)
266 hose->pci_mem = hose->regions + i;
268 case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
269 if (!hose->pci_prefetch ||
270 hose->pci_prefetch->size < hose->regions[i].size)
271 hose->pci_prefetch = hose->regions + i;
278 pciauto_region_init(hose->pci_mem);
280 DEBUGF("PCI Autoconfig: Memory region: [%lx-%lx]\n",
281 hose->pci_mem->bus_start,
282 hose->pci_mem->bus_start + hose->pci_mem->size - 1);
285 if (hose->pci_prefetch) {
286 pciauto_region_init(hose->pci_prefetch);
288 DEBUGF("PCI Autoconfig: Prefetchable Memory region: [%lx-%lx]\n",
289 hose->pci_prefetch->bus_start,
290 hose->pci_prefetch->bus_start + hose->pci_prefetch->size - 1);
294 pciauto_region_init(hose->pci_io);
296 DEBUGF("PCI Autoconfig: I/O region: [%lx-%lx]\n",
297 hose->pci_io->bus_start,
298 hose->pci_io->bus_start + hose->pci_io->size - 1);
302 /* HJF: Changed this to return int. I think this is required
303 * to get the correct result when scanning bridges
305 int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev)
307 unsigned int sub_bus = PCI_BUS(dev);
308 unsigned short class;
309 unsigned char prg_iface;
312 pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);
315 case PCI_CLASS_BRIDGE_PCI:
316 hose->current_busno++;
317 pciauto_setup_device(hose, dev, 2, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
319 DEBUGF("PCI Autoconfig: Found P2P bridge, device %d\n", PCI_DEV(dev));
321 /* Passing in current_busno allows for sibling P2P bridges */
322 pciauto_prescan_setup_bridge(hose, dev, hose->current_busno);
324 * need to figure out if this is a subordinate bridge on the bus
325 * to be able to properly set the pri/sec/sub bridge registers.
327 n = pci_hose_scan_bus(hose, hose->current_busno);
329 /* figure out the deepest we've gone for this leg */
330 sub_bus = max(n, sub_bus);
331 pciauto_postscan_setup_bridge(hose, dev, sub_bus);
333 sub_bus = hose->current_busno;
336 case PCI_CLASS_STORAGE_IDE:
337 pci_hose_read_config_byte(hose, dev, PCI_CLASS_PROG, &prg_iface);
338 if (!(prg_iface & PCIAUTO_IDE_MODE_MASK)) {
339 DEBUGF("PCI Autoconfig: Skipping legacy mode IDE controller\n");
343 pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
346 case PCI_CLASS_BRIDGE_CARDBUS:
347 /* just do a minimal setup of the bridge, let the OS take care of the rest */
348 pciauto_setup_device(hose, dev, 0, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
350 DEBUGF("PCI Autoconfig: Found P2CardBus bridge, device %d\n", PCI_DEV(dev));
352 hose->current_busno++;
355 #ifdef CONFIG_MPC5200
356 case PCI_CLASS_BRIDGE_OTHER:
357 DEBUGF("PCI Autoconfig: Skipping bridge device %d\n",
361 #ifdef CONFIG_MPC834X
362 case PCI_CLASS_BRIDGE_OTHER:
364 * The host/PCI bridge 1 seems broken in 8349 - it presents
365 * itself as 'PCI_CLASS_BRIDGE_OTHER' and appears as an _agent_
366 * device claiming resources io/mem/irq.. we only allow for
367 * the PIMMR window to be allocated (BAR0 - 1MB size)
369 DEBUGF("PCI Autoconfig: Broken bridge found, only minimal config\n");
370 pciauto_setup_device(hose, dev, 0, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
374 pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
381 #endif /* CONFIG_PCI */