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>
46 #include <machine/smp.h>
50 #include <vm/vm_param.h>
51 #include <vm/vm_kern.h>
52 #include <vm/vm_extern.h>
54 #include <machine/pmap.h>
56 #if defined(__DragonFly__)
57 #define mtx_init(a, b, c, d) spin_init(a)
58 #define mtx_lock_spin(a) spin_lock_wr(a)
59 #define mtx_unlock_spin(a) spin_unlock_wr(a)
62 #define PRVERB(a) do { \
68 struct pcie_cfg_elem {
69 TAILQ_ENTRY(pcie_cfg_elem) elem;
81 static TAILQ_HEAD(pcie_cfg_list, pcie_cfg_elem) pcie_list[MAXCPU];
82 static uint32_t pciebar;
85 #if defined(__DragonFly__)
86 static struct spinlock pcicfg_mtx;
88 static struct mtx pcicfg_mtx;
91 static int pcireg_cfgread(int bus, int slot, int func, int reg, int bytes);
92 static void pcireg_cfgwrite(int bus, int slot, int func, int reg, int data, int bytes);
93 static int pcireg_cfgopen(void);
95 static int pciereg_cfgopen(void);
96 static int pciereg_cfgread(int bus, int slot, int func, int reg,
98 static void pciereg_cfgwrite(int bus, int slot, int func, int reg,
102 * Some BIOS writers seem to want to ignore the spec and put
103 * 0 in the intline rather than 255 to indicate none. Some use
104 * numbers in the range 128-254 to indicate something strange and
105 * apparently undocumented anywhere. Assume these are completely bogus
106 * and map them to 255, which means "none".
109 pci_i386_map_intline(int line)
111 if (line == 0 || line >= 128)
112 return (PCI_INVALID_IRQ);
117 pcibios_get_version(void)
119 struct bios_regs args;
121 if (PCIbios.ventry == 0) {
122 PRVERB(("pcibios: No call entry point\n"));
125 args.eax = PCIBIOS_BIOS_PRESENT;
126 if (bios32(&args, PCIbios.ventry, GSEL(GCODE_SEL, SEL_KPL))) {
127 PRVERB(("pcibios: BIOS_PRESENT call failed\n"));
130 if (args.edx != 0x20494350) {
131 PRVERB(("pcibios: BIOS_PRESENT didn't return 'PCI ' in edx\n"));
134 return (args.ebx & 0xffff);
138 * Initialise access to PCI configuration space
143 static int opened = 0;
149 if (pcireg_cfgopen() == 0)
152 v = pcibios_get_version();
154 PRVERB(("pcibios: BIOS version %x.%02x\n", (v & 0xff00) >> 8,
156 mtx_init(&pcicfg_mtx, "pcicfg", NULL, MTX_SPIN);
159 /* $PIR requires PCI BIOS 2.10 or greater. */
164 * Grope around in the PCI config space to see if this is a
165 * chipset that is capable of doing memory-mapped config cycles.
166 * This also implies that it can do PCIe extended config cycles.
169 /* Check for supported chipsets */
170 vid = pci_cfgregread(0, 0, 0, PCIR_VENDOR, 2);
171 did = pci_cfgregread(0, 0, 0, PCIR_DEVICE, 2);
173 if (did == 0x3590 || did == 0x3592) {
174 /* Intel 7520 or 7320 */
175 pciebar = pci_cfgregread(0, 0, 0, 0xce, 2) << 16;
177 } else if (did == 0x2580 || did == 0x2584) {
178 /* Intel 915 or 925 */
179 pciebar = pci_cfgregread(0, 0, 0, 0x48, 4);
188 * Read configuration space register
191 pci_cfgregread(int bus, int slot, int func, int reg, int bytes)
198 * If we are using the APIC, the contents of the intline
199 * register will probably be wrong (since they are set up for
200 * use with the PIC. Rather than rewrite these registers
201 * (maybe that would be smarter) we trap attempts to read them
202 * and translate to our private vector numbers.
204 if ((reg == PCIR_INTLINE) && (bytes == 1)) {
206 pin = pcireg_cfgread(bus, slot, func, PCIR_INTPIN, 1);
207 line = pcireg_cfgread(bus, slot, func, PCIR_INTLINE, 1);
212 airq = pci_apic_irq(bus, slot, pin);
214 /* PCI specific entry found in MP table */
216 undirect_pci_irq(line);
220 * PCI interrupts might be redirected to the
221 * ISA bus according to some MP tables. Use the
222 * same methods as used by the ISA devices
223 * devices to find the proper IOAPIC int pin.
225 airq = isa_apic_irq(line);
226 if ((airq >= 0) && (airq != line)) {
227 /* XXX: undirect_pci_irq() ? */
228 undirect_isa_irq(line);
237 * Some BIOS writers seem to want to ignore the spec and put
238 * 0 in the intline rather than 255 to indicate none. The rest of
239 * the code uses 255 as an invalid IRQ.
241 if (reg == PCIR_INTLINE && bytes == 1) {
242 line = pcireg_cfgread(bus, slot, func, PCIR_INTLINE, 1);
243 return (pci_i386_map_intline(line));
246 return (pcireg_cfgread(bus, slot, func, reg, bytes));
250 * Write configuration space register
253 pci_cfgregwrite(int bus, int slot, int func, int reg, u_int32_t data, int bytes)
256 pcireg_cfgwrite(bus, slot, func, reg, data, bytes);
260 * Configuration space access using direct register operations
263 /* enable configuration space accesses and return data port address */
265 pci_cfgenable(unsigned bus, unsigned slot, unsigned func, int reg, int bytes)
270 if (arch_i386_is_xbox) {
272 * The Xbox MCPX chipset is a derivative of the nForce 1
273 * chipset. It almost has the same bus layout; some devices
274 * cannot be used, because they have been removed.
278 * Devices 00:00.1 and 00:00.2 used to be memory controllers on
279 * the nForce chipset, but on the Xbox, using them will lockup
282 if (bus == 0 && slot == 0 && (func == 1 || func == 2))
286 * Bus 1 only contains a VGA controller at 01:00.0. When you try
287 * to probe beyond that device, you only get garbage, which
288 * could cause lockups.
290 if (bus == 1 && (slot != 0 || func != 0))
294 * Bus 2 used to contain the AGP controller, but the Xbox MCPX
295 * doesn't have one. Probing it can cause lockups.
302 if (bus <= PCI_BUSMAX
304 && func <= PCI_FUNCMAX
307 && (unsigned) bytes <= 4
308 && (reg & (bytes - 1)) == 0) {
311 outl(CONF1_ADDR_PORT, (1 << 31)
312 | (bus << 16) | (slot << 11)
313 | (func << 8) | (reg & ~0x03));
314 dataport = CONF1_DATA_PORT + (reg & 0x03);
317 outb(CONF2_ENABLE_PORT, 0xf0 | (func << 1));
318 outb(CONF2_FORWARD_PORT, bus);
319 dataport = 0xc000 | (slot << 8) | reg;
326 /* disable configuration space accesses */
333 * Do nothing for the config mechanism 1 case.
334 * Writing a 0 to the address port can apparently
335 * confuse some bridges and cause spurious
340 outb(CONF2_ENABLE_PORT, 0);
346 pcireg_cfgread(int bus, int slot, int func, int reg, int bytes)
351 if (cfgmech == CFGMECH_PCIE) {
352 data = pciereg_cfgread(bus, slot, func, reg, bytes);
356 mtx_lock_spin(&pcicfg_mtx);
357 port = pci_cfgenable(bus, slot, func, reg, bytes);
372 mtx_unlock_spin(&pcicfg_mtx);
377 pcireg_cfgwrite(int bus, int slot, int func, int reg, int data, int bytes)
381 if (cfgmech == CFGMECH_PCIE) {
382 pciereg_cfgwrite(bus, slot, func, reg, data, bytes);
386 mtx_lock_spin(&pcicfg_mtx);
387 port = pci_cfgenable(bus, slot, func, reg, bytes);
402 mtx_unlock_spin(&pcicfg_mtx);
405 /* check whether the configuration mechanism has been correctly identified */
407 pci_cfgcheck(int maxdev)
415 kprintf("pci_cfgcheck:\tdevice ");
417 for (device = 0; device < maxdev; device++) {
419 kprintf("%d ", device);
421 port = pci_cfgenable(0, device, 0, 0, 4);
423 if (id == 0 || id == 0xffffffff)
426 port = pci_cfgenable(0, device, 0, 8, 4);
427 class = inl(port) >> 8;
429 kprintf("[class=%06x] ", class);
430 if (class == 0 || (class & 0xf870ff) != 0)
433 port = pci_cfgenable(0, device, 0, 14, 1);
436 kprintf("[hdr=%02x] ", header);
437 if ((header & 0x7e) != 0)
441 kprintf("is there (id=%08x)\n", id);
447 kprintf("-- nothing found\n");
456 uint32_t mode1res, oldval1;
457 uint8_t mode2res, oldval2;
459 /* Check for type #1 first. */
460 oldval1 = inl(CONF1_ADDR_PORT);
463 kprintf("pci_open(1):\tmode 1 addr port (0x0cf8) is 0x%08x\n",
470 outl(CONF1_ADDR_PORT, CONF1_ENABLE_CHK);
472 mode1res = inl(CONF1_ADDR_PORT);
473 outl(CONF1_ADDR_PORT, oldval1);
476 kprintf("pci_open(1a):\tmode1res=0x%08x (0x%08lx)\n", mode1res,
480 if (pci_cfgcheck(32))
484 outl(CONF1_ADDR_PORT, CONF1_ENABLE_CHK1);
485 mode1res = inl(CONF1_ADDR_PORT);
486 outl(CONF1_ADDR_PORT, oldval1);
489 kprintf("pci_open(1b):\tmode1res=0x%08x (0x%08lx)\n", mode1res,
492 if ((mode1res & CONF1_ENABLE_MSK1) == CONF1_ENABLE_RES1) {
493 if (pci_cfgcheck(32))
497 /* Type #1 didn't work, so try type #2. */
498 oldval2 = inb(CONF2_ENABLE_PORT);
501 kprintf("pci_open(2):\tmode 2 enable port (0x0cf8) is 0x%02x\n",
505 if ((oldval2 & 0xf0) == 0) {
510 outb(CONF2_ENABLE_PORT, CONF2_ENABLE_CHK);
511 mode2res = inb(CONF2_ENABLE_PORT);
512 outb(CONF2_ENABLE_PORT, oldval2);
515 kprintf("pci_open(2a):\tmode2res=0x%02x (0x%02x)\n",
516 mode2res, CONF2_ENABLE_CHK);
518 if (mode2res == CONF2_ENABLE_RES) {
520 kprintf("pci_open(2a):\tnow trying mechanism 2\n");
522 if (pci_cfgcheck(16))
527 /* Nothing worked, so punt. */
528 cfgmech = CFGMECH_NONE;
534 pciereg_cfgopen(void)
537 struct pcie_cfg_list *pcielist;
538 struct pcie_cfg_elem *pcie_array, *elem;
546 kprintf("Setting up PCIe mappings for BAR 0x%x\n", pciebar);
549 SLIST_FOREACH(pc, &cpuhead, pc_allcpu)
553 pcie_array = kmalloc(sizeof(struct pcie_cfg_elem) * PCIE_CACHE,
555 if (pcie_array == NULL)
558 va = kmem_alloc_nofault(&kernel_map, PCIE_CACHE * PAGE_SIZE);
560 kfree(pcie_array, M_DEVBUF);
565 pcielist = &pcie_list[pc->pc_cpuid];
567 pcielist = &pcie_list[0];
569 TAILQ_INIT(pcielist);
570 for (i = 0; i < PCIE_CACHE; i++) {
571 elem = &pcie_array[i];
572 elem->vapage = va + (i * PAGE_SIZE);
574 TAILQ_INSERT_HEAD(pcielist, elem, elem);
579 cfgmech = CFGMECH_PCIE;
582 #else /* !PCIE_CFG_MECH */
584 #endif /* PCIE_CFG_MECH */
587 #define PCIE_PADDR(bar, reg, bus, slot, func) \
589 (((bus) & 0xff) << 20) | \
590 (((slot) & 0x1f) << 15) | \
591 (((func) & 0x7) << 12) | \
595 * Find an element in the cache that matches the physical page desired, or
596 * create a new mapping from the least recently used element.
597 * A very simple LRU algorithm is used here, does it need to be more
600 static __inline struct pcie_cfg_elem *
601 pciereg_findelem(vm_paddr_t papage)
603 struct pcie_cfg_list *pcielist;
604 struct pcie_cfg_elem *elem;
605 pcielist = &pcie_list[mycpuid];
606 TAILQ_FOREACH(elem, pcielist, elem) {
607 if (elem->papage == papage)
612 elem = TAILQ_LAST(pcielist, pcie_cfg_list);
613 if (elem->papage != 0) {
614 pmap_kremove(elem->vapage);
615 cpu_invlpg(&elem->vapage);
617 pmap_kenter(elem->vapage, papage);
618 elem->papage = papage;
621 if (elem != TAILQ_FIRST(pcielist)) {
622 TAILQ_REMOVE(pcielist, elem, elem);
623 TAILQ_INSERT_HEAD(pcielist, elem, elem);
629 pciereg_cfgread(int bus, int slot, int func, int reg, int bytes)
631 struct pcie_cfg_elem *elem;
632 volatile vm_offset_t va;
633 vm_paddr_t pa, papage;
637 pa = PCIE_PADDR(pciebar, reg, bus, slot, func);
638 papage = pa & ~PAGE_MASK;
639 elem = pciereg_findelem(papage);
640 va = elem->vapage | (pa & PAGE_MASK);
644 data = *(volatile uint32_t *)(va);
647 data = *(volatile uint16_t *)(va);
650 data = *(volatile uint8_t *)(va);
653 panic("pciereg_cfgread: invalid width");
661 pciereg_cfgwrite(int bus, int slot, int func, int reg, int data, int bytes)
663 struct pcie_cfg_elem *elem;
664 volatile vm_offset_t va;
665 vm_paddr_t pa, papage;
668 pa = PCIE_PADDR(pciebar, reg, bus, slot, func);
669 papage = pa & ~PAGE_MASK;
670 elem = pciereg_findelem(papage);
671 va = elem->vapage | (pa & PAGE_MASK);
675 *(volatile uint32_t *)(va) = data;
678 *(volatile uint16_t *)(va) = data;
681 *(volatile uint8_t *)(va) = data;
684 panic("pciereg_cfgwrite: invalid width");