1 // SPDX-License-Identifier: GPL-2.0+
3 * PCI autoconfiguration library
5 * Author: Matt Porter <mporter@mvista.com>
7 * Copyright 2000 MontaVista Software Inc.
16 /* the user can define CONFIG_SYS_PCI_CACHE_LINE_SIZE to avoid problems */
17 #ifndef CONFIG_SYS_PCI_CACHE_LINE_SIZE
18 #define CONFIG_SYS_PCI_CACHE_LINE_SIZE 8
21 static void dm_pciauto_setup_device(struct udevice *dev, int bars_num,
22 struct pci_region *mem,
23 struct pci_region *prefetch,
24 struct pci_region *io)
33 struct pci_region *bar_res = NULL;
37 dm_pci_read_config16(dev, PCI_COMMAND, &cmdstat);
38 cmdstat = (cmdstat & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) |
41 for (bar = PCI_BASE_ADDRESS_0;
42 bar < PCI_BASE_ADDRESS_0 + (bars_num * 4); bar += 4) {
45 /* Tickle the BAR and get the response */
46 dm_pci_write_config32(dev, bar, 0xffffffff);
47 dm_pci_read_config32(dev, bar, &bar_response);
49 /* If BAR is not implemented (or invalid) go to the next BAR */
50 if (!bar_response || bar_response == 0xffffffff)
55 /* Check the BAR type and set our address mask */
56 if (bar_response & PCI_BASE_ADDRESS_SPACE) {
57 bar_size = bar_response & PCI_BASE_ADDRESS_IO_MASK;
58 bar_size &= ~(bar_size - 1);
62 debug("PCI Autoconfig: BAR %d, I/O, size=0x%llx, ",
63 bar_nr, (unsigned long long)bar_size);
65 if ((bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
66 PCI_BASE_ADDRESS_MEM_TYPE_64) {
67 u32 bar_response_upper;
70 dm_pci_write_config32(dev, bar + 4, 0xffffffff);
71 dm_pci_read_config32(dev, bar + 4,
74 bar64 = ((u64)bar_response_upper << 32) |
77 bar_size = ~(bar64 & PCI_BASE_ADDRESS_MEM_MASK)
81 bar_size = (u32)(~(bar_response &
82 PCI_BASE_ADDRESS_MEM_MASK) + 1);
86 (bar_response & PCI_BASE_ADDRESS_MEM_PREFETCH))
91 debug("PCI Autoconfig: BAR %d, %s%s, size=0x%llx, ",
92 bar_nr, bar_res == prefetch ? "Prf" : "Mem",
93 found_mem64 ? "64" : "",
94 (unsigned long long)bar_size);
97 ret = pciauto_region_allocate(bar_res, bar_size,
98 &bar_value, found_mem64);
100 printf("PCI: Failed autoconfig bar %x\n", bar);
103 /* Write it out and update our limit */
104 dm_pci_write_config32(dev, bar, (u32)bar_value);
108 #ifdef CONFIG_SYS_PCI_64BIT
109 dm_pci_write_config32(dev, bar,
110 (u32)(bar_value >> 32));
113 * If we are a 64-bit decoder then increment to
114 * the upper 32 bits of the bar and force it to
115 * locate in the lower 4GB of memory.
117 dm_pci_write_config32(dev, bar, 0x00000000);
122 cmdstat |= (bar_response & PCI_BASE_ADDRESS_SPACE) ?
123 PCI_COMMAND_IO : PCI_COMMAND_MEMORY;
130 /* Configure the expansion ROM address */
131 dm_pci_read_config8(dev, PCI_HEADER_TYPE, &header_type);
133 if (header_type != PCI_HEADER_TYPE_CARDBUS) {
134 rom_addr = (header_type == PCI_HEADER_TYPE_NORMAL) ?
135 PCI_ROM_ADDRESS : PCI_ROM_ADDRESS1;
136 dm_pci_write_config32(dev, rom_addr, 0xfffffffe);
137 dm_pci_read_config32(dev, rom_addr, &bar_response);
139 bar_size = -(bar_response & ~1);
140 debug("PCI Autoconfig: ROM, size=%#x, ",
141 (unsigned int)bar_size);
142 if (pciauto_region_allocate(mem, bar_size, &bar_value,
144 dm_pci_write_config32(dev, rom_addr, bar_value);
146 cmdstat |= PCI_COMMAND_MEMORY;
151 /* PCI_COMMAND_IO must be set for VGA device */
152 dm_pci_read_config16(dev, PCI_CLASS_DEVICE, &class);
153 if (class == PCI_CLASS_DISPLAY_VGA)
154 cmdstat |= PCI_COMMAND_IO;
156 dm_pci_write_config16(dev, PCI_COMMAND, cmdstat);
157 dm_pci_write_config8(dev, PCI_CACHE_LINE_SIZE,
158 CONFIG_SYS_PCI_CACHE_LINE_SIZE);
159 dm_pci_write_config8(dev, PCI_LATENCY_TIMER, 0x80);
162 void dm_pciauto_prescan_setup_bridge(struct udevice *dev, int sub_bus)
164 struct pci_region *pci_mem;
165 struct pci_region *pci_prefetch;
166 struct pci_region *pci_io;
167 u16 cmdstat, prefechable_64;
169 struct udevice *ctlr = pci_get_controller(dev);
170 struct pci_controller *ctlr_hose = dev_get_uclass_priv(ctlr);
172 pci_mem = ctlr_hose->pci_mem;
173 pci_prefetch = ctlr_hose->pci_prefetch;
174 pci_io = ctlr_hose->pci_io;
176 dm_pci_read_config16(dev, PCI_COMMAND, &cmdstat);
177 dm_pci_read_config16(dev, PCI_PREF_MEMORY_BASE, &prefechable_64);
178 prefechable_64 &= PCI_PREF_RANGE_TYPE_MASK;
179 dm_pci_read_config8(dev, PCI_IO_LIMIT, &io_32);
180 io_32 &= PCI_IO_RANGE_TYPE_MASK;
182 /* Configure bus number registers */
183 dm_pci_write_config8(dev, PCI_PRIMARY_BUS,
184 PCI_BUS(dm_pci_get_bdf(dev)) - dev_seq(ctlr));
185 dm_pci_write_config8(dev, PCI_SECONDARY_BUS, sub_bus - dev_seq(ctlr));
186 dm_pci_write_config8(dev, PCI_SUBORDINATE_BUS, 0xff);
189 /* Round memory allocator to 1MB boundary */
190 pciauto_region_align(pci_mem, 0x100000);
193 * Set up memory and I/O filter limits, assume 32-bit
196 dm_pci_write_config16(dev, PCI_MEMORY_BASE,
197 ((pci_mem->bus_lower & 0xfff00000) >> 16) &
198 PCI_MEMORY_RANGE_MASK);
200 cmdstat |= PCI_COMMAND_MEMORY;
204 /* Round memory allocator to 1MB boundary */
205 pciauto_region_align(pci_prefetch, 0x100000);
208 * Set up memory and I/O filter limits, assume 32-bit
211 dm_pci_write_config16(dev, PCI_PREF_MEMORY_BASE,
212 (((pci_prefetch->bus_lower & 0xfff00000) >> 16) &
213 PCI_PREF_RANGE_MASK) | prefechable_64);
214 if (prefechable_64 == PCI_PREF_RANGE_TYPE_64)
215 #ifdef CONFIG_SYS_PCI_64BIT
216 dm_pci_write_config32(dev, PCI_PREF_BASE_UPPER32,
217 pci_prefetch->bus_lower >> 32);
219 dm_pci_write_config32(dev, PCI_PREF_BASE_UPPER32, 0x0);
222 cmdstat |= PCI_COMMAND_MEMORY;
224 /* We don't support prefetchable memory for now, so disable */
225 dm_pci_write_config16(dev, PCI_PREF_MEMORY_BASE, 0x1000 |
227 dm_pci_write_config16(dev, PCI_PREF_MEMORY_LIMIT, 0x0 |
229 if (prefechable_64 == PCI_PREF_RANGE_TYPE_64) {
230 dm_pci_write_config16(dev, PCI_PREF_BASE_UPPER32, 0x0);
231 dm_pci_write_config16(dev, PCI_PREF_LIMIT_UPPER32, 0x0);
236 /* Round I/O allocator to 4KB boundary */
237 pciauto_region_align(pci_io, 0x1000);
239 dm_pci_write_config8(dev, PCI_IO_BASE,
240 (((pci_io->bus_lower & 0x0000f000) >> 8) &
241 PCI_IO_RANGE_MASK) | io_32);
242 if (io_32 == PCI_IO_RANGE_TYPE_32)
243 dm_pci_write_config16(dev, PCI_IO_BASE_UPPER16,
244 (pci_io->bus_lower & 0xffff0000) >> 16);
246 cmdstat |= PCI_COMMAND_IO;
249 /* Enable memory and I/O accesses, enable bus master */
250 dm_pci_write_config16(dev, PCI_COMMAND, cmdstat | PCI_COMMAND_MASTER);
253 void dm_pciauto_postscan_setup_bridge(struct udevice *dev, int sub_bus)
255 struct pci_region *pci_mem;
256 struct pci_region *pci_prefetch;
257 struct pci_region *pci_io;
258 struct udevice *ctlr = pci_get_controller(dev);
259 struct pci_controller *ctlr_hose = dev_get_uclass_priv(ctlr);
261 pci_mem = ctlr_hose->pci_mem;
262 pci_prefetch = ctlr_hose->pci_prefetch;
263 pci_io = ctlr_hose->pci_io;
265 /* Configure bus number registers */
266 dm_pci_write_config8(dev, PCI_SUBORDINATE_BUS, sub_bus - dev_seq(ctlr));
269 /* Round memory allocator to 1MB boundary */
270 pciauto_region_align(pci_mem, 0x100000);
272 dm_pci_write_config16(dev, PCI_MEMORY_LIMIT,
273 ((pci_mem->bus_lower - 1) >> 16) &
274 PCI_MEMORY_RANGE_MASK);
280 dm_pci_read_config16(dev, PCI_PREF_MEMORY_LIMIT,
282 prefechable_64 &= PCI_PREF_RANGE_TYPE_MASK;
284 /* Round memory allocator to 1MB boundary */
285 pciauto_region_align(pci_prefetch, 0x100000);
287 dm_pci_write_config16(dev, PCI_PREF_MEMORY_LIMIT,
288 (((pci_prefetch->bus_lower - 1) >> 16) &
289 PCI_PREF_RANGE_MASK) | prefechable_64);
290 if (prefechable_64 == PCI_PREF_RANGE_TYPE_64)
291 #ifdef CONFIG_SYS_PCI_64BIT
292 dm_pci_write_config32(dev, PCI_PREF_LIMIT_UPPER32,
293 (pci_prefetch->bus_lower - 1) >> 32);
295 dm_pci_write_config32(dev, PCI_PREF_LIMIT_UPPER32, 0x0);
302 dm_pci_read_config8(dev, PCI_IO_LIMIT,
304 io_32 &= PCI_IO_RANGE_TYPE_MASK;
306 /* Round I/O allocator to 4KB boundary */
307 pciauto_region_align(pci_io, 0x1000);
309 dm_pci_write_config8(dev, PCI_IO_LIMIT,
310 ((((pci_io->bus_lower - 1) & 0x0000f000) >> 8) &
311 PCI_IO_RANGE_MASK) | io_32);
312 if (io_32 == PCI_IO_RANGE_TYPE_32)
313 dm_pci_write_config16(dev, PCI_IO_LIMIT_UPPER16,
314 ((pci_io->bus_lower - 1) & 0xffff0000) >> 16);
319 * HJF: Changed this to return int. I think this is required
320 * to get the correct result when scanning bridges
322 int dm_pciauto_config_device(struct udevice *dev)
324 struct pci_region *pci_mem;
325 struct pci_region *pci_prefetch;
326 struct pci_region *pci_io;
327 unsigned int sub_bus = PCI_BUS(dm_pci_get_bdf(dev));
328 unsigned short class;
329 struct udevice *ctlr = pci_get_controller(dev);
330 struct pci_controller *ctlr_hose = dev_get_uclass_priv(ctlr);
333 pci_mem = ctlr_hose->pci_mem;
334 pci_prefetch = ctlr_hose->pci_prefetch;
335 pci_io = ctlr_hose->pci_io;
337 dm_pci_read_config16(dev, PCI_CLASS_DEVICE, &class);
340 case PCI_CLASS_BRIDGE_PCI:
341 debug("PCI Autoconfig: Found P2P bridge, device %d\n",
342 PCI_DEV(dm_pci_get_bdf(dev)));
344 dm_pciauto_setup_device(dev, 2, pci_mem, pci_prefetch, pci_io);
346 ret = dm_pci_hose_probe_bus(dev);
348 return log_msg_ret("probe", ret);
352 case PCI_CLASS_BRIDGE_CARDBUS:
354 * just do a minimal setup of the bridge,
355 * let the OS take care of the rest
357 dm_pciauto_setup_device(dev, 0, pci_mem, pci_prefetch, pci_io);
359 debug("PCI Autoconfig: Found P2CardBus bridge, device %d\n",
360 PCI_DEV(dm_pci_get_bdf(dev)));
364 #if defined(CONFIG_PCIAUTO_SKIP_HOST_BRIDGE)
365 case PCI_CLASS_BRIDGE_OTHER:
366 debug("PCI Autoconfig: Skipping bridge device %d\n",
367 PCI_DEV(dm_pci_get_bdf(dev)));
370 #if defined(CONFIG_ARCH_MPC834X)
371 case PCI_CLASS_BRIDGE_OTHER:
373 * The host/PCI bridge 1 seems broken in 8349 - it presents
374 * itself as 'PCI_CLASS_BRIDGE_OTHER' and appears as an _agent_
375 * device claiming resources io/mem/irq.. we only allow for
376 * the PIMMR window to be allocated (BAR0 - 1MB size)
378 debug("PCI Autoconfig: Broken bridge found, only minimal config\n");
379 dm_pciauto_setup_device(dev, 0, hose->pci_mem,
380 hose->pci_prefetch, hose->pci_io);
384 case PCI_CLASS_PROCESSOR_POWERPC: /* an agent or end-point */
385 debug("PCI AutoConfig: Found PowerPC device\n");
389 dm_pciauto_setup_device(dev, 6, pci_mem, pci_prefetch, pci_io);