1 // Initialize PCI devices (on emulators)
3 // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
4 // Copyright (C) 2006 Fabrice Bellard
6 // This file may be distributed under the terms of the GNU LGPLv3 license.
8 #include "util.h" // dprintf
9 #include "pci.h" // pci_config_readl
10 #include "biosvar.h" // GET_EBDA
11 #include "pci_ids.h" // PCI_VENDOR_ID_INTEL
12 #include "pci_regs.h" // PCI_COMMAND
14 #define PCI_ROM_SLOT 6
15 #define PCI_NUM_REGIONS 7
17 static void pci_bios_init_device_in_bus(int bus);
19 static u32 pci_bios_io_addr;
20 static u32 pci_bios_mem_addr;
21 static u32 pci_bios_prefmem_addr;
22 /* host irqs corresponding to PCI irqs A-D */
23 static u8 pci_irqs[4] = {
27 static u32 pci_bar(u16 bdf, int region_num)
29 if (region_num != PCI_ROM_SLOT) {
30 return PCI_BASE_ADDRESS_0 + region_num * 4;
33 #define PCI_HEADER_TYPE_MULTI_FUNCTION 0x80
34 u8 type = pci_config_readb(bdf, PCI_HEADER_TYPE);
35 type &= ~PCI_HEADER_TYPE_MULTI_FUNCTION;
36 return type == PCI_HEADER_TYPE_BRIDGE ? PCI_ROM_ADDRESS1 : PCI_ROM_ADDRESS;
39 static void pci_set_io_region_addr(u16 bdf, int region_num, u32 addr)
43 ofs = pci_bar(bdf, region_num);
45 old_addr = pci_config_readl(bdf, ofs);
47 pci_config_writel(bdf, ofs, addr);
48 dprintf(1, "region %d: 0x%08x\n", region_num, addr);
56 static int pci_bios_allocate_region(u16 bdf, int region_num)
59 u32 ofs = pci_bar(bdf, region_num);
61 u32 old = pci_config_readl(bdf, ofs);
63 if (region_num == PCI_ROM_SLOT) {
64 mask = PCI_ROM_ADDRESS_MASK;
65 pci_config_writel(bdf, ofs, mask);
67 if (old & PCI_BASE_ADDRESS_SPACE_IO)
68 mask = PCI_BASE_ADDRESS_IO_MASK;
70 mask = PCI_BASE_ADDRESS_MEM_MASK;
71 pci_config_writel(bdf, ofs, ~0);
73 u32 val = pci_config_readl(bdf, ofs);
74 pci_config_writel(bdf, ofs, old);
76 u32 size = (~(val & mask)) + 1;
78 if (val & PCI_BASE_ADDRESS_SPACE_IO) {
79 paddr = &pci_bios_io_addr;
80 if (ALIGN(*paddr, size) + size >= 64 * 1024) {
82 "io region of (bdf 0x%x bar %d) can't be mapped.\n",
86 } else if ((val & PCI_BASE_ADDRESS_MEM_PREFETCH) &&
87 /* keep behaviour on bus = 0 */
88 pci_bdf_to_bus(bdf) != 0 &&
89 /* If pci_bios_prefmem_addr == 0, keep old behaviour */
90 pci_bios_prefmem_addr != 0) {
91 paddr = &pci_bios_prefmem_addr;
92 if (ALIGN(*paddr, size) + size >= BUILD_PCIPREFMEM_END) {
94 "prefmem region of (bdf 0x%x bar %d) can't be mapped. "
95 "decrease BUILD_PCIMEM_SIZE and recompile. size %x\n",
96 bdf, region_num, BUILD_PCIPREFMEM_SIZE);
100 paddr = &pci_bios_mem_addr;
101 if (ALIGN(*paddr, size) + size >= BUILD_PCIMEM_END) {
103 "mem region of (bdf 0x%x bar %d) can't be mapped. "
104 "increase BUILD_PCIMEM_SIZE and recompile. size %x\n",
105 bdf, region_num, BUILD_PCIMEM_SIZE);
110 *paddr = ALIGN(*paddr, size);
111 pci_set_io_region_addr(bdf, region_num, *paddr);
116 int is_64bit = !(val & PCI_BASE_ADDRESS_SPACE_IO) &&
117 (val & PCI_BASE_ADDRESS_MEM_TYPE_MASK) == PCI_BASE_ADDRESS_MEM_TYPE_64;
120 pci_config_writel(bdf, ofs + 4, 0);
122 pci_config_writel(bdf, ofs + 4, ~0);
128 static void pci_bios_allocate_regions(u16 bdf)
131 for (i = 0; i < PCI_NUM_REGIONS; i++) {
132 int is_64bit = pci_bios_allocate_region(bdf, i);
139 /* return the global irq number corresponding to a given device irq
140 pin. We could also use the bus number to have a more precise
142 static int pci_slot_get_pirq(u16 bdf, int irq_num)
144 int slot_addend = pci_bdf_to_dev(bdf) - 1;
145 return (irq_num + slot_addend) & 3;
148 static void pci_bios_init_bridges(u16 bdf)
150 u16 vendor_id = pci_config_readw(bdf, PCI_VENDOR_ID);
151 u16 device_id = pci_config_readw(bdf, PCI_DEVICE_ID);
153 if (vendor_id == PCI_VENDOR_ID_INTEL
154 && (device_id == PCI_DEVICE_ID_INTEL_82371SB_0
155 || device_id == PCI_DEVICE_ID_INTEL_82371AB_0)) {
159 /* PIIX3/PIIX4 PCI to ISA bridge */
163 for (i = 0; i < 4; i++) {
165 /* set to trigger level */
166 elcr[irq >> 3] |= (1 << (irq & 7));
167 /* activate irq remapping in PIIX */
168 pci_config_writeb(bdf, 0x60 + i, irq);
170 outb(elcr[0], 0x4d0);
171 outb(elcr[1], 0x4d1);
172 dprintf(1, "PIIX3/PIIX4 init: elcr=%02x %02x\n",
177 #define PCI_IO_ALIGN 4096
178 #define PCI_IO_SHIFT 8
179 #define PCI_MEMORY_ALIGN (1UL << 20)
180 #define PCI_MEMORY_SHIFT 16
181 #define PCI_PREF_MEMORY_ALIGN (1UL << 20)
182 #define PCI_PREF_MEMORY_SHIFT 16
184 static void pci_bios_init_device_bridge(u16 bdf)
186 pci_bios_allocate_region(bdf, 0);
187 pci_bios_allocate_region(bdf, 1);
188 pci_bios_allocate_region(bdf, PCI_ROM_SLOT);
190 u32 io_old = pci_bios_io_addr;
191 u32 mem_old = pci_bios_mem_addr;
192 u32 prefmem_old = pci_bios_prefmem_addr;
194 /* IO BASE is assumed to be 16 bit */
195 pci_bios_io_addr = ALIGN(pci_bios_io_addr, PCI_IO_ALIGN);
196 pci_bios_mem_addr = ALIGN(pci_bios_mem_addr, PCI_MEMORY_ALIGN);
197 pci_bios_prefmem_addr =
198 ALIGN(pci_bios_prefmem_addr, PCI_PREF_MEMORY_ALIGN);
200 u32 io_base = pci_bios_io_addr;
201 u32 mem_base = pci_bios_mem_addr;
202 u32 prefmem_base = pci_bios_prefmem_addr;
204 u8 secbus = pci_config_readb(bdf, PCI_SECONDARY_BUS);
206 pci_bios_init_device_in_bus(secbus);
209 pci_bios_io_addr = ALIGN(pci_bios_io_addr, PCI_IO_ALIGN);
210 pci_bios_mem_addr = ALIGN(pci_bios_mem_addr, PCI_MEMORY_ALIGN);
211 pci_bios_prefmem_addr =
212 ALIGN(pci_bios_prefmem_addr, PCI_PREF_MEMORY_ALIGN);
214 u32 io_end = pci_bios_io_addr;
215 if (io_end == io_base) {
216 pci_bios_io_addr = io_old;
220 pci_config_writeb(bdf, PCI_IO_BASE, io_base >> PCI_IO_SHIFT);
221 pci_config_writew(bdf, PCI_IO_BASE_UPPER16, 0);
222 pci_config_writeb(bdf, PCI_IO_LIMIT, (io_end - 1) >> PCI_IO_SHIFT);
223 pci_config_writew(bdf, PCI_IO_LIMIT_UPPER16, 0);
225 u32 mem_end = pci_bios_mem_addr;
226 if (mem_end == mem_base) {
227 pci_bios_mem_addr = mem_old;
228 mem_base = 0xffffffff;
231 pci_config_writew(bdf, PCI_MEMORY_BASE, mem_base >> PCI_MEMORY_SHIFT);
232 pci_config_writew(bdf, PCI_MEMORY_LIMIT, (mem_end -1) >> PCI_MEMORY_SHIFT);
234 u32 prefmem_end = pci_bios_prefmem_addr;
235 if (prefmem_end == prefmem_base) {
236 pci_bios_prefmem_addr = prefmem_old;
237 prefmem_base = 0xffffffff;
240 pci_config_writew(bdf, PCI_PREF_MEMORY_BASE,
241 prefmem_base >> PCI_PREF_MEMORY_SHIFT);
242 pci_config_writew(bdf, PCI_PREF_MEMORY_LIMIT,
243 (prefmem_end - 1) >> PCI_PREF_MEMORY_SHIFT);
244 pci_config_writel(bdf, PCI_PREF_BASE_UPPER32, 0);
245 pci_config_writel(bdf, PCI_PREF_LIMIT_UPPER32, 0);
247 dprintf(1, "PCI: br io = [0x%x, 0x%x)\n", io_base, io_end);
248 dprintf(1, "PCI: br mem = [0x%x, 0x%x)\n", mem_base, mem_end);
249 dprintf(1, "PCI: br pref = [0x%x, 0x%x)\n", prefmem_base, prefmem_end);
251 u16 cmd = pci_config_readw(bdf, PCI_COMMAND);
252 cmd &= ~PCI_COMMAND_IO;
253 if (io_end > io_base) {
254 cmd |= PCI_COMMAND_IO;
256 cmd &= ~PCI_COMMAND_MEMORY;
257 if (mem_end > mem_base || prefmem_end > prefmem_base) {
258 cmd |= PCI_COMMAND_MEMORY;
260 cmd |= PCI_COMMAND_MASTER;
261 pci_config_writew(bdf, PCI_COMMAND, cmd);
263 pci_config_maskw(bdf, PCI_BRIDGE_CONTROL, 0, PCI_BRIDGE_CTL_SERR);
266 static void pci_bios_init_device(u16 bdf)
269 int pin, pic_irq, vendor_id, device_id;
271 class = pci_config_readw(bdf, PCI_CLASS_DEVICE);
272 vendor_id = pci_config_readw(bdf, PCI_VENDOR_ID);
273 device_id = pci_config_readw(bdf, PCI_DEVICE_ID);
274 dprintf(1, "PCI: bus=%d devfn=0x%02x: vendor_id=0x%04x device_id=0x%04x\n"
275 , pci_bdf_to_bus(bdf), pci_bdf_to_devfn(bdf), vendor_id, device_id);
277 case PCI_CLASS_STORAGE_IDE:
278 if (vendor_id == PCI_VENDOR_ID_INTEL
279 && (device_id == PCI_DEVICE_ID_INTEL_82371SB_1
280 || device_id == PCI_DEVICE_ID_INTEL_82371AB)) {
281 /* PIIX3/PIIX4 IDE */
282 pci_config_writew(bdf, 0x40, 0x8000); // enable IDE0
283 pci_config_writew(bdf, 0x42, 0x8000); // enable IDE1
284 pci_bios_allocate_regions(bdf);
286 /* IDE: we map it as in ISA mode */
287 pci_set_io_region_addr(bdf, 0, PORT_ATA1_CMD_BASE);
288 pci_set_io_region_addr(bdf, 1, PORT_ATA1_CTRL_BASE);
289 pci_set_io_region_addr(bdf, 2, PORT_ATA2_CMD_BASE);
290 pci_set_io_region_addr(bdf, 3, PORT_ATA2_CTRL_BASE);
293 case PCI_CLASS_SYSTEM_PIC:
295 if (vendor_id == PCI_VENDOR_ID_IBM) {
297 if (device_id == 0x0046 || device_id == 0xFFFF) {
299 pci_set_io_region_addr(bdf, 0, 0x80800000 + 0x00040000);
304 if (vendor_id == PCI_VENDOR_ID_APPLE &&
305 (device_id == 0x0017 || device_id == 0x0022)) {
307 pci_set_io_region_addr(bdf, 0, 0x80800000);
310 case PCI_CLASS_BRIDGE_PCI:
311 pci_bios_init_device_bridge(bdf);
314 /* default memory mappings */
315 pci_bios_allocate_regions(bdf);
319 /* enable memory mappings */
320 pci_config_maskw(bdf, PCI_COMMAND, 0, PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
322 /* map the interrupt */
323 pin = pci_config_readb(bdf, PCI_INTERRUPT_PIN);
325 pin = pci_slot_get_pirq(bdf, pin - 1);
326 pic_irq = pci_irqs[pin];
327 pci_config_writeb(bdf, PCI_INTERRUPT_LINE, pic_irq);
330 if (vendor_id == PCI_VENDOR_ID_INTEL
331 && device_id == PCI_DEVICE_ID_INTEL_82371AB_3) {
332 /* PIIX4 Power Management device (for ACPI) */
334 // acpi sci is hardwired to 9
335 pci_config_writeb(bdf, PCI_INTERRUPT_LINE, 9);
337 pci_config_writel(bdf, 0x40, PORT_ACPI_PM_BASE | 1);
338 pci_config_writeb(bdf, 0x80, 0x01); /* enable PM io space */
339 pci_config_writel(bdf, 0x90, PORT_SMB_BASE | 1);
340 pci_config_writeb(bdf, 0xd2, 0x09); /* enable SMBus io space */
344 static void pci_bios_init_device_in_bus(int bus)
347 foreachpci_in_bus(bdf, max, bus) {
348 pci_bios_init_device(bdf);
353 pci_bios_init_bus_rec(int bus, u8 *pci_bus)
358 dprintf(1, "PCI: %s bus = 0x%x\n", __func__, bus);
360 /* prevent accidental access to unintended devices */
361 foreachpci_in_bus(bdf, max, bus) {
362 class = pci_config_readw(bdf, PCI_CLASS_DEVICE);
363 if (class == PCI_CLASS_BRIDGE_PCI) {
364 pci_config_writeb(bdf, PCI_SECONDARY_BUS, 255);
365 pci_config_writeb(bdf, PCI_SUBORDINATE_BUS, 0);
369 foreachpci_in_bus(bdf, max, bus) {
370 class = pci_config_readw(bdf, PCI_CLASS_DEVICE);
371 if (class != PCI_CLASS_BRIDGE_PCI) {
374 dprintf(1, "PCI: %s bdf = 0x%x\n", __func__, bdf);
376 u8 pribus = pci_config_readb(bdf, PCI_PRIMARY_BUS);
378 dprintf(1, "PCI: primary bus = 0x%x -> 0x%x\n", pribus, bus);
379 pci_config_writeb(bdf, PCI_PRIMARY_BUS, bus);
381 dprintf(1, "PCI: primary bus = 0x%x\n", pribus);
384 u8 secbus = pci_config_readb(bdf, PCI_SECONDARY_BUS);
386 if (*pci_bus != secbus) {
387 dprintf(1, "PCI: secondary bus = 0x%x -> 0x%x\n",
390 pci_config_writeb(bdf, PCI_SECONDARY_BUS, secbus);
392 dprintf(1, "PCI: secondary bus = 0x%x\n", secbus);
395 /* set to max for access to all subordinate buses.
396 later set it to accurate value */
397 u8 subbus = pci_config_readb(bdf, PCI_SUBORDINATE_BUS);
398 pci_config_writeb(bdf, PCI_SUBORDINATE_BUS, 255);
400 pci_bios_init_bus_rec(secbus, pci_bus);
402 if (subbus != *pci_bus) {
403 dprintf(1, "PCI: subordinate bus = 0x%x -> 0x%x\n",
407 dprintf(1, "PCI: subordinate bus = 0x%x\n", subbus);
409 pci_config_writeb(bdf, PCI_SUBORDINATE_BUS, subbus);
414 pci_bios_init_bus(void)
417 pci_bios_init_bus_rec(0 /* host bus */, &pci_bus);
424 // Already done by coreboot.
427 dprintf(3, "pci setup\n");
429 pci_bios_io_addr = 0xc000;
430 pci_bios_mem_addr = BUILD_PCIMEM_START;
431 pci_bios_prefmem_addr = BUILD_PCIPREFMEM_START;
436 foreachpci(bdf, max) {
437 pci_bios_init_bridges(bdf);
439 pci_bios_init_device_in_bus(0 /* host bus */);