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 bus_lower=%x", addr, res->bus_lower);
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 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,
169 PCI_BUS(dev) - hose->first_busno);
170 pci_hose_write_config_byte(hose, dev, PCI_SECONDARY_BUS,
171 sub_bus - hose->first_busno);
172 pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS, 0xff);
175 /* Round memory allocator to 1MB boundary */
176 pciauto_region_align(pci_mem, 0x100000);
178 /* Set up memory and I/O filter limits, assume 32-bit I/O space */
179 pci_hose_write_config_word(hose, dev, PCI_MEMORY_BASE,
180 (pci_mem->bus_lower & 0xfff00000) >> 16);
182 cmdstat |= PCI_COMMAND_MEMORY;
186 /* Round memory allocator to 1MB boundary */
187 pciauto_region_align(pci_prefetch, 0x100000);
189 /* Set up memory and I/O filter limits, assume 32-bit I/O space */
190 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE,
191 (pci_prefetch->bus_lower & 0xfff00000) >> 16);
193 cmdstat |= PCI_COMMAND_MEMORY;
195 /* We don't support prefetchable memory for now, so disable */
196 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE, 0x1000);
197 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT, 0x0);
201 /* Round I/O allocator to 4KB boundary */
202 pciauto_region_align(pci_io, 0x1000);
204 pci_hose_write_config_byte(hose, dev, PCI_IO_BASE,
205 (pci_io->bus_lower & 0x0000f000) >> 8);
206 pci_hose_write_config_word(hose, dev, PCI_IO_BASE_UPPER16,
207 (pci_io->bus_lower & 0xffff0000) >> 16);
209 cmdstat |= PCI_COMMAND_IO;
212 /* Enable memory and I/O accesses, enable bus master */
213 pci_hose_write_config_dword(hose, dev, PCI_COMMAND, cmdstat | PCI_COMMAND_MASTER);
216 void pciauto_postscan_setup_bridge(struct pci_controller *hose,
217 pci_dev_t dev, int sub_bus)
219 struct pci_region *pci_mem = hose->pci_mem;
220 struct pci_region *pci_prefetch = hose->pci_prefetch;
221 struct pci_region *pci_io = hose->pci_io;
223 /* Configure bus number registers */
224 pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS,
225 sub_bus - hose->first_busno);
228 /* Round memory allocator to 1MB boundary */
229 pciauto_region_align(pci_mem, 0x100000);
231 pci_hose_write_config_word(hose, dev, PCI_MEMORY_LIMIT,
232 (pci_mem->bus_lower-1) >> 16);
236 /* Round memory allocator to 1MB boundary */
237 pciauto_region_align(pci_prefetch, 0x100000);
239 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT,
240 (pci_prefetch->bus_lower-1) >> 16);
244 /* Round I/O allocator to 4KB boundary */
245 pciauto_region_align(pci_io, 0x1000);
247 pci_hose_write_config_byte(hose, dev, PCI_IO_LIMIT,
248 ((pci_io->bus_lower-1) & 0x0000f000) >> 8);
249 pci_hose_write_config_word(hose, dev, PCI_IO_LIMIT_UPPER16,
250 ((pci_io->bus_lower-1) & 0xffff0000) >> 16);
258 void pciauto_config_init(struct pci_controller *hose)
262 hose->pci_io = hose->pci_mem = NULL;
264 for (i=0; i<hose->region_count; i++) {
265 switch(hose->regions[i].flags) {
268 hose->pci_io->size < hose->regions[i].size)
269 hose->pci_io = hose->regions + i;
272 if (!hose->pci_mem ||
273 hose->pci_mem->size < hose->regions[i].size)
274 hose->pci_mem = hose->regions + i;
276 case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
277 if (!hose->pci_prefetch ||
278 hose->pci_prefetch->size < hose->regions[i].size)
279 hose->pci_prefetch = hose->regions + i;
286 pciauto_region_init(hose->pci_mem);
288 DEBUGF("PCI Autoconfig: Bus Memory region: [%lx-%lx],\n"
289 "\t\tPhysical Memory [%x-%x]\n",
290 hose->pci_mem->bus_start,
291 hose->pci_mem->bus_start + hose->pci_mem->size - 1,
292 hose->pci_mem->phys_start,
293 hose->pci_mem->phys_start + hose->pci_mem->size - 1);
296 if (hose->pci_prefetch) {
297 pciauto_region_init(hose->pci_prefetch);
299 DEBUGF("PCI Autoconfig: Bus Prefetchable Mem: [%lx-%lx],\n"
300 "\t\tPhysical Memory [%x-%x]\n",
301 hose->pci_prefetch->bus_start,
302 hose->pci_prefetch->bus_start + hose->pci_prefetch->size - 1,
303 hose->pci_prefetch->phys_start,
304 hose->pci_prefetch->phys_start +
305 hose->pci_prefetch->size - 1);
309 pciauto_region_init(hose->pci_io);
311 DEBUGF("PCI Autoconfig: Bus I/O region: [%lx-%lx],\n"
312 "\t\tPhysical Memory: [%x-%x]\n",
313 hose->pci_io->bus_start,
314 hose->pci_io->bus_start + hose->pci_io->size - 1,
315 hose->pci_io->phys_start,
316 hose->pci_io->phys_start + hose->pci_io->size - 1);
321 /* HJF: Changed this to return int. I think this is required
322 * to get the correct result when scanning bridges
324 int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev)
326 unsigned int sub_bus = PCI_BUS(dev);
327 unsigned short class;
328 unsigned char prg_iface;
331 pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);
334 case PCI_CLASS_PROCESSOR_POWERPC: /* an agent or end-point */
335 DEBUGF("PCI AutoConfig: Found PowerPC device\n");
336 pciauto_setup_device(hose, dev, 6, hose->pci_mem,
337 hose->pci_prefetch, hose->pci_io);
340 case PCI_CLASS_BRIDGE_PCI:
341 hose->current_busno++;
342 pciauto_setup_device(hose, dev, 2, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
344 DEBUGF("PCI Autoconfig: Found P2P bridge, device %d\n", PCI_DEV(dev));
346 /* Passing in current_busno allows for sibling P2P bridges */
347 pciauto_prescan_setup_bridge(hose, dev, hose->current_busno);
349 * need to figure out if this is a subordinate bridge on the bus
350 * to be able to properly set the pri/sec/sub bridge registers.
352 n = pci_hose_scan_bus(hose, hose->current_busno);
354 /* figure out the deepest we've gone for this leg */
355 sub_bus = max(n, sub_bus);
356 pciauto_postscan_setup_bridge(hose, dev, sub_bus);
358 sub_bus = hose->current_busno;
361 case PCI_CLASS_STORAGE_IDE:
362 pci_hose_read_config_byte(hose, dev, PCI_CLASS_PROG, &prg_iface);
363 if (!(prg_iface & PCIAUTO_IDE_MODE_MASK)) {
364 DEBUGF("PCI Autoconfig: Skipping legacy mode IDE controller\n");
368 pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
371 case PCI_CLASS_BRIDGE_CARDBUS:
372 /* just do a minimal setup of the bridge, let the OS take care of the rest */
373 pciauto_setup_device(hose, dev, 0, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
375 DEBUGF("PCI Autoconfig: Found P2CardBus bridge, device %d\n", PCI_DEV(dev));
377 hose->current_busno++;
380 #ifdef CONFIG_MPC5200
381 case PCI_CLASS_BRIDGE_OTHER:
382 DEBUGF("PCI Autoconfig: Skipping bridge device %d\n",
386 #ifdef CONFIG_MPC834X
387 case PCI_CLASS_BRIDGE_OTHER:
389 * The host/PCI bridge 1 seems broken in 8349 - it presents
390 * itself as 'PCI_CLASS_BRIDGE_OTHER' and appears as an _agent_
391 * device claiming resources io/mem/irq.. we only allow for
392 * the PIMMR window to be allocated (BAR0 - 1MB size)
394 DEBUGF("PCI Autoconfig: Broken bridge found, only minimal config\n");
395 pciauto_setup_device(hose, dev, 0, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
399 pciauto_setup_device(hose, dev, 6, hose->pci_mem, hose->pci_prefetch, hose->pci_io);
406 #endif /* CONFIG_PCI */