2 * Copyright (c) 1997, Stefan Esser <se@kfreebsd.org>
3 * Copyright (c) 2000, Michael Smith <msmith@kfreebsd.org>
4 * Copyright (c) 2000, BSDi
5 * Copyright (c) 2004, Scott Long <scottl@kfreebsd.org>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 * $FreeBSD: src/sys/i386/pci/pci_cfgreg.c,v 1.124.2.2.6.1 2009/04/15 03:14:26 kensmith Exp $
32 #include <sys/param.h>
33 #include <sys/systm.h>
36 #include <sys/malloc.h>
37 #include <sys/thread2.h>
38 #include <sys/spinlock.h>
39 #include <sys/spinlock2.h>
40 #include <sys/queue.h>
41 #include <bus/pci/pcivar.h>
42 #include <bus/pci/pcireg.h>
43 #include "pci_cfgreg.h"
44 #include <machine/pc/bios.h>
47 #include <vm/vm_param.h>
48 #include <vm/vm_kern.h>
49 #include <vm/vm_extern.h>
51 #include <machine/pmap.h>
53 #if defined(__DragonFly__)
54 #define mtx_init(a, b, c, d) spin_init(a)
55 #define mtx_lock_spin(a) spin_lock_wr(a)
56 #define mtx_unlock_spin(a) spin_unlock_wr(a)
59 #define PRVERB(a) do { \
65 struct pcie_cfg_elem {
66 TAILQ_ENTRY(pcie_cfg_elem) elem;
78 static TAILQ_HEAD(pcie_cfg_list, pcie_cfg_elem) pcie_list[MAXCPU];
79 static uint32_t pciebar;
82 #if defined(__DragonFly__)
83 static struct spinlock pcicfg_mtx;
85 static struct mtx pcicfg_mtx;
88 static int pcireg_cfgread(int bus, int slot, int func, int reg, int bytes);
89 static void pcireg_cfgwrite(int bus, int slot, int func, int reg, int data, int bytes);
90 static int pcireg_cfgopen(void);
92 static int pciereg_cfgopen(void);
93 static int pciereg_cfgread(int bus, int slot, int func, int reg,
95 static void pciereg_cfgwrite(int bus, int slot, int func, int reg,
99 * Some BIOS writers seem to want to ignore the spec and put
100 * 0 in the intline rather than 255 to indicate none. Some use
101 * numbers in the range 128-254 to indicate something strange and
102 * apparently undocumented anywhere. Assume these are completely bogus
103 * and map them to 255, which means "none".
106 pci_i386_map_intline(int line)
108 if (line == 0 || line >= 128)
109 return (PCI_INVALID_IRQ);
114 pcibios_get_version(void)
116 struct bios_regs args;
118 if (PCIbios.ventry == 0) {
119 PRVERB(("pcibios: No call entry point\n"));
122 args.eax = PCIBIOS_BIOS_PRESENT;
123 if (bios32(&args, PCIbios.ventry, GSEL(GCODE_SEL, SEL_KPL))) {
124 PRVERB(("pcibios: BIOS_PRESENT call failed\n"));
127 if (args.edx != 0x20494350) {
128 PRVERB(("pcibios: BIOS_PRESENT didn't return 'PCI ' in edx\n"));
131 return (args.ebx & 0xffff);
135 * Initialise access to PCI configuration space
140 static int opened = 0;
146 if (pcireg_cfgopen() == 0)
149 v = pcibios_get_version();
151 PRVERB(("pcibios: BIOS version %x.%02x\n", (v & 0xff00) >> 8,
153 mtx_init(&pcicfg_mtx, "pcicfg", NULL, MTX_SPIN);
156 /* $PIR requires PCI BIOS 2.10 or greater. */
161 * Grope around in the PCI config space to see if this is a
162 * chipset that is capable of doing memory-mapped config cycles.
163 * This also implies that it can do PCIe extended config cycles.
166 /* Check for supported chipsets */
167 vid = pci_cfgregread(0, 0, 0, PCIR_VENDOR, 2);
168 did = pci_cfgregread(0, 0, 0, PCIR_DEVICE, 2);
170 if (did == 0x3590 || did == 0x3592) {
171 /* Intel 7520 or 7320 */
172 pciebar = pci_cfgregread(0, 0, 0, 0xce, 2) << 16;
174 } else if (did == 0x2580 || did == 0x2584) {
175 /* Intel 915 or 925 */
176 pciebar = pci_cfgregread(0, 0, 0, 0x48, 4);
185 * Read configuration space register
188 pci_cfgregread(int bus, int slot, int func, int reg, int bytes)
193 * Some BIOS writers seem to want to ignore the spec and put
194 * 0 in the intline rather than 255 to indicate none. The rest of
195 * the code uses 255 as an invalid IRQ.
197 if (reg == PCIR_INTLINE && bytes == 1) {
198 line = pcireg_cfgread(bus, slot, func, PCIR_INTLINE, 1);
199 return (pci_i386_map_intline(line));
201 return (pcireg_cfgread(bus, slot, func, reg, bytes));
205 * Write configuration space register
208 pci_cfgregwrite(int bus, int slot, int func, int reg, u_int32_t data, int bytes)
211 pcireg_cfgwrite(bus, slot, func, reg, data, bytes);
215 * Configuration space access using direct register operations
218 /* enable configuration space accesses and return data port address */
220 pci_cfgenable(unsigned bus, unsigned slot, unsigned func, int reg, int bytes)
225 if (arch_i386_is_xbox) {
227 * The Xbox MCPX chipset is a derivative of the nForce 1
228 * chipset. It almost has the same bus layout; some devices
229 * cannot be used, because they have been removed.
233 * Devices 00:00.1 and 00:00.2 used to be memory controllers on
234 * the nForce chipset, but on the Xbox, using them will lockup
237 if (bus == 0 && slot == 0 && (func == 1 || func == 2))
241 * Bus 1 only contains a VGA controller at 01:00.0. When you try
242 * to probe beyond that device, you only get garbage, which
243 * could cause lockups.
245 if (bus == 1 && (slot != 0 || func != 0))
249 * Bus 2 used to contain the AGP controller, but the Xbox MCPX
250 * doesn't have one. Probing it can cause lockups.
257 if (bus <= PCI_BUSMAX
259 && func <= PCI_FUNCMAX
262 && (unsigned) bytes <= 4
263 && (reg & (bytes - 1)) == 0) {
266 outl(CONF1_ADDR_PORT, (1 << 31)
267 | (bus << 16) | (slot << 11)
268 | (func << 8) | (reg & ~0x03));
269 dataport = CONF1_DATA_PORT + (reg & 0x03);
272 outb(CONF2_ENABLE_PORT, 0xf0 | (func << 1));
273 outb(CONF2_FORWARD_PORT, bus);
274 dataport = 0xc000 | (slot << 8) | reg;
281 /* disable configuration space accesses */
288 * Do nothing for the config mechanism 1 case.
289 * Writing a 0 to the address port can apparently
290 * confuse some bridges and cause spurious
295 outb(CONF2_ENABLE_PORT, 0);
301 pcireg_cfgread(int bus, int slot, int func, int reg, int bytes)
306 if (cfgmech == CFGMECH_PCIE) {
307 data = pciereg_cfgread(bus, slot, func, reg, bytes);
311 mtx_lock_spin(&pcicfg_mtx);
312 port = pci_cfgenable(bus, slot, func, reg, bytes);
327 mtx_unlock_spin(&pcicfg_mtx);
332 pcireg_cfgwrite(int bus, int slot, int func, int reg, int data, int bytes)
336 if (cfgmech == CFGMECH_PCIE) {
337 pciereg_cfgwrite(bus, slot, func, reg, data, bytes);
341 mtx_lock_spin(&pcicfg_mtx);
342 port = pci_cfgenable(bus, slot, func, reg, bytes);
357 mtx_unlock_spin(&pcicfg_mtx);
360 /* check whether the configuration mechanism has been correctly identified */
362 pci_cfgcheck(int maxdev)
370 kprintf("pci_cfgcheck:\tdevice ");
372 for (device = 0; device < maxdev; device++) {
374 kprintf("%d ", device);
376 port = pci_cfgenable(0, device, 0, 0, 4);
378 if (id == 0 || id == 0xffffffff)
381 port = pci_cfgenable(0, device, 0, 8, 4);
382 class = inl(port) >> 8;
384 kprintf("[class=%06x] ", class);
385 if (class == 0 || (class & 0xf870ff) != 0)
388 port = pci_cfgenable(0, device, 0, 14, 1);
391 kprintf("[hdr=%02x] ", header);
392 if ((header & 0x7e) != 0)
396 kprintf("is there (id=%08x)\n", id);
402 kprintf("-- nothing found\n");
411 uint32_t mode1res, oldval1;
412 uint8_t mode2res, oldval2;
414 /* Check for type #1 first. */
415 oldval1 = inl(CONF1_ADDR_PORT);
418 kprintf("pci_open(1):\tmode 1 addr port (0x0cf8) is 0x%08x\n",
425 outl(CONF1_ADDR_PORT, CONF1_ENABLE_CHK);
427 mode1res = inl(CONF1_ADDR_PORT);
428 outl(CONF1_ADDR_PORT, oldval1);
431 kprintf("pci_open(1a):\tmode1res=0x%08x (0x%08lx)\n", mode1res,
435 if (pci_cfgcheck(32))
439 outl(CONF1_ADDR_PORT, CONF1_ENABLE_CHK1);
440 mode1res = inl(CONF1_ADDR_PORT);
441 outl(CONF1_ADDR_PORT, oldval1);
444 kprintf("pci_open(1b):\tmode1res=0x%08x (0x%08lx)\n", mode1res,
447 if ((mode1res & CONF1_ENABLE_MSK1) == CONF1_ENABLE_RES1) {
448 if (pci_cfgcheck(32))
452 /* Type #1 didn't work, so try type #2. */
453 oldval2 = inb(CONF2_ENABLE_PORT);
456 kprintf("pci_open(2):\tmode 2 enable port (0x0cf8) is 0x%02x\n",
460 if ((oldval2 & 0xf0) == 0) {
465 outb(CONF2_ENABLE_PORT, CONF2_ENABLE_CHK);
466 mode2res = inb(CONF2_ENABLE_PORT);
467 outb(CONF2_ENABLE_PORT, oldval2);
470 kprintf("pci_open(2a):\tmode2res=0x%02x (0x%02x)\n",
471 mode2res, CONF2_ENABLE_CHK);
473 if (mode2res == CONF2_ENABLE_RES) {
475 kprintf("pci_open(2a):\tnow trying mechanism 2\n");
477 if (pci_cfgcheck(16))
482 /* Nothing worked, so punt. */
483 cfgmech = CFGMECH_NONE;
489 pciereg_cfgopen(void)
492 struct pcie_cfg_list *pcielist;
493 struct pcie_cfg_elem *pcie_array, *elem;
501 kprintf("Setting up PCIe mappings for BAR 0x%x\n", pciebar);
504 SLIST_FOREACH(pc, &cpuhead, pc_allcpu)
508 pcie_array = kmalloc(sizeof(struct pcie_cfg_elem) * PCIE_CACHE,
510 if (pcie_array == NULL)
513 va = kmem_alloc_nofault(&kernel_map, PCIE_CACHE * PAGE_SIZE);
515 kfree(pcie_array, M_DEVBUF);
520 pcielist = &pcie_list[pc->pc_cpuid];
522 pcielist = &pcie_list[0];
524 TAILQ_INIT(pcielist);
525 for (i = 0; i < PCIE_CACHE; i++) {
526 elem = &pcie_array[i];
527 elem->vapage = va + (i * PAGE_SIZE);
529 TAILQ_INSERT_HEAD(pcielist, elem, elem);
534 cfgmech = CFGMECH_PCIE;
537 #else /* !PCIE_CFG_MECH */
539 #endif /* PCIE_CFG_MECH */
542 #define PCIE_PADDR(bar, reg, bus, slot, func) \
544 (((bus) & 0xff) << 20) | \
545 (((slot) & 0x1f) << 15) | \
546 (((func) & 0x7) << 12) | \
550 * Find an element in the cache that matches the physical page desired, or
551 * create a new mapping from the least recently used element.
552 * A very simple LRU algorithm is used here, does it need to be more
555 static __inline struct pcie_cfg_elem *
556 pciereg_findelem(vm_paddr_t papage)
558 struct pcie_cfg_list *pcielist;
559 struct pcie_cfg_elem *elem;
560 pcielist = &pcie_list[mycpuid];
561 TAILQ_FOREACH(elem, pcielist, elem) {
562 if (elem->papage == papage)
567 elem = TAILQ_LAST(pcielist, pcie_cfg_list);
568 if (elem->papage != 0) {
569 pmap_kremove(elem->vapage);
570 cpu_invlpg(&elem->vapage);
572 pmap_kenter(elem->vapage, papage);
573 elem->papage = papage;
576 if (elem != TAILQ_FIRST(pcielist)) {
577 TAILQ_REMOVE(pcielist, elem, elem);
578 TAILQ_INSERT_HEAD(pcielist, elem, elem);
584 pciereg_cfgread(int bus, int slot, int func, int reg, int bytes)
586 struct pcie_cfg_elem *elem;
587 volatile vm_offset_t va;
588 vm_paddr_t pa, papage;
592 pa = PCIE_PADDR(pciebar, reg, bus, slot, func);
593 papage = pa & ~PAGE_MASK;
594 elem = pciereg_findelem(papage);
595 va = elem->vapage | (pa & PAGE_MASK);
599 data = *(volatile uint32_t *)(va);
602 data = *(volatile uint16_t *)(va);
605 data = *(volatile uint8_t *)(va);
608 panic("pciereg_cfgread: invalid width");
616 pciereg_cfgwrite(int bus, int slot, int func, int reg, int data, int bytes)
618 struct pcie_cfg_elem *elem;
619 volatile vm_offset_t va;
620 vm_paddr_t pa, papage;
623 pa = PCIE_PADDR(pciebar, reg, bus, slot, func);
624 papage = pa & ~PAGE_MASK;
625 elem = pciereg_findelem(papage);
626 va = elem->vapage | (pa & PAGE_MASK);
630 *(volatile uint32_t *)(va) = data;
633 *(volatile uint16_t *)(va) = data;
636 *(volatile uint8_t *)(va) = data;
639 panic("pciereg_cfgwrite: invalid width");