sb_zbpci.c revision 195333 
1/*-
2 * Copyright (c) 2009 Neelkanth Natu
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/param.h>
28#include <sys/types.h>
29#include <sys/kernel.h>
30#include <sys/systm.h>
31#include <sys/module.h>
32#include <sys/bus.h>
33#include <sys/pcpu.h>
34#include <sys/smp.h>
35
36#include <vm/vm.h>
37#include <vm/vm_param.h>
38#include <vm/vm_kern.h>
39#include <vm/vm_extern.h>
40#include <vm/pmap.h>
41
42#include <dev/pci/pcivar.h>
43#include <dev/pci/pcib_private.h>
44
45#include <machine/pmap.h>
46#include <machine/resource.h>
47
48#include "pcib_if.h"
49
50#include "sb_scd.h"
51
52__FBSDID("$FreeBSD: projects/mips/sys/mips/sibyte/sb_zbpci.c 195333 2009-07-04 03:05:48Z imp $");
53
54static struct {
55	vm_offset_t vaddr;
56	vm_paddr_t  paddr;
57} zbpci_config_space[MAXCPU];
58
59static const vm_paddr_t CFG_PADDR_BASE = 0xFE000000;
60
61static int
62zbpci_probe(device_t dev)
63{
64
65	device_set_desc(dev, "Broadcom/Sibyte PCI I/O Bridge");
66	return (0);
67}
68
69static int
70zbpci_attach(device_t dev)
71{
72	int n, rid, size;
73	vm_offset_t va;
74	struct resource *res;
75
76	/*
77	 * Reserve the the physical memory that is used to read/write to the
78	 * pci config space but don't activate it. We are using a page worth
79	 * of KVA as a window over this region.
80	 */
81	rid = 0;
82	size = (PCI_BUSMAX + 1) * (PCI_SLOTMAX + 1) * (PCI_FUNCMAX + 1) * 256;
83	res = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid, CFG_PADDR_BASE,
84				 CFG_PADDR_BASE + size - 1, size, 0);
85	if (res == NULL) {
86		panic("Cannot allocate resource for config space accesses.");
87	}
88
89	/*
90	 * Allocate KVA for accessing PCI config space.
91	 */
92	va = kmem_alloc_nofault(kernel_map, PAGE_SIZE * mp_ncpus);
93	if (va == 0) {
94		device_printf(dev, "Cannot allocate virtual addresses for "
95				   "config space access.\n");
96		return (ENOMEM);
97	}
98
99	for (n = 0; n < mp_ncpus; ++n) {
100		zbpci_config_space[n].vaddr = va + n * PAGE_SIZE;
101	}
102
103	/*
104	 * Sibyte has the PCI bus hierarchy rooted at bus 0 and HT-PCI
105	 * hierarchy rooted at bus 1.
106	 */
107	if (device_add_child(dev, "pci", 0) == NULL) {
108		panic("zbpci_attach: could not add pci bus 0.\n");
109	}
110
111	if (device_add_child(dev, "pci", 1) == NULL) {
112		panic("zbpci_attach: could not add pci bus 1.\n");
113	}
114
115	if (bootverbose) {
116		device_printf(dev, "attached.\n");
117	}
118
119	return (bus_generic_attach(dev));
120}
121
122static int
123zbpci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
124{
125
126	switch (which) {
127	case PCIB_IVAR_DOMAIN:
128		*result = 0;				/* single PCI domain */
129		return (0);
130	case PCIB_IVAR_BUS:
131		*result = device_get_unit(child);	/* PCI bus 0 or 1 */
132		return (0);
133	default:
134		return (ENOENT);
135	}
136}
137
138/*
139 * We rely on the CFE to have configured the intline correctly to point to
140 * one of PCI-A/PCI-B/PCI-C/PCI-D in the interupt mapper.
141 */
142static int
143zbpci_route_interrupt(device_t pcib, device_t dev, int pin)
144{
145
146	return (PCI_INVALID_IRQ);
147}
148
149/*
150 * This function is expected to be called in a critical section since it
151 * changes the per-cpu pci config space va-to-pa mappings.
152 */
153static vm_offset_t
154zbpci_config_space_va(int bus, int slot, int func, int reg, int bytes)
155{
156	int cpu;
157	vm_offset_t va_page;
158	vm_paddr_t pa, pa_page;
159
160	if (bus <= PCI_BUSMAX && slot <= PCI_SLOTMAX && func <= PCI_FUNCMAX &&
161	    reg <= PCI_REGMAX && (bytes == 1 || bytes == 2 || bytes == 4) &&
162	    ((reg & (bytes - 1)) == 0)) {
163		cpu = PCPU_GET(cpuid);
164		va_page = zbpci_config_space[cpu].vaddr;
165		pa = CFG_PADDR_BASE |
166		     (bus << 16) | (slot << 11) | (func << 8) | reg;
167		pa_page = pa & ~(PAGE_SIZE - 1);
168		if (zbpci_config_space[cpu].paddr != pa_page) {
169			pmap_kremove(va_page);
170			pmap_kenter(va_page, pa_page);
171			zbpci_config_space[cpu].paddr = pa_page;
172		}
173		return (va_page + (pa - pa_page));
174	} else {
175		return (0);
176	}
177}
178
179static uint32_t
180zbpci_read_config(device_t dev, u_int b, u_int s, u_int f, u_int r, int w)
181{
182	uint32_t data;
183	vm_offset_t va;
184
185	critical_enter();
186
187	va = zbpci_config_space_va(b, s, f, r, w);
188	if (va == 0) {
189		panic("zbpci_read_config: invalid %d/%d/%d[%d] %d\n",
190		      b, s, f, r, w);
191	}
192
193	switch (w) {
194	case 4:
195		data = *(uint32_t *)va;
196		break;
197	case 2:
198		data = *(uint16_t *)va;
199		break;
200	case 1:
201		data = *(uint8_t *)va;
202		break;
203	default:
204		panic("zbpci_read_config: invalid width %d\n", w);
205	}
206
207	critical_exit();
208
209	return (data);
210}
211
212static void
213zbpci_write_config(device_t d, u_int b, u_int s, u_int f, u_int r,
214		   uint32_t data, int w)
215{
216	vm_offset_t va;
217
218	critical_enter();
219
220	va = zbpci_config_space_va(b, s, f, r, w);
221	if (va == 0) {
222		panic("zbpci_write_config: invalid %d/%d/%d[%d] %d/%d\n",
223		      b, s, f, r, data, w);
224	}
225
226	switch (w) {
227	case 4:
228		*(uint32_t *)va = data;
229		break;
230	case 2:
231		*(uint16_t *)va = data;
232		break;
233	case 1:
234		*(uint8_t *)va = data;
235		break;
236	default:
237		panic("zbpci_write_config: invalid width %d\n", w);
238	}
239
240	critical_exit();
241}
242
243static device_method_t zbpci_methods[] ={
244	/* Device interface */
245	DEVMETHOD(device_probe,		zbpci_probe),
246	DEVMETHOD(device_attach,	zbpci_attach),
247	DEVMETHOD(device_detach,	bus_generic_detach),
248	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
249	DEVMETHOD(device_suspend,	bus_generic_suspend),
250	DEVMETHOD(device_resume,	bus_generic_resume),
251
252	/* Bus interface */
253	DEVMETHOD(bus_read_ivar,	zbpci_read_ivar),
254	DEVMETHOD(bus_write_ivar,	bus_generic_write_ivar),
255	DEVMETHOD(bus_alloc_resource,	bus_generic_alloc_resource),
256	DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
257	DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
258	DEVMETHOD(bus_release_resource,	bus_generic_release_resource),
259	DEVMETHOD(bus_setup_intr,	bus_generic_setup_intr),
260	DEVMETHOD(bus_teardown_intr,	bus_generic_teardown_intr),
261	DEVMETHOD(bus_add_child,	bus_generic_add_child),
262
263	/* pcib interface */
264	DEVMETHOD(pcib_maxslots,	pcib_maxslots),
265	DEVMETHOD(pcib_read_config,	zbpci_read_config),
266	DEVMETHOD(pcib_write_config,	zbpci_write_config),
267	DEVMETHOD(pcib_route_interrupt,	zbpci_route_interrupt),
268
269	{ 0, 0 }
270};
271
272/*
273 * The "zbpci" class inherits from the "pcib" base class. Therefore in
274 * addition to drivers that belong to the "zbpci" class we will also
275 * consider drivers belonging to the "pcib" when probing children of
276 * "zbpci".
277 */
278DECLARE_CLASS(pcib_driver);
279DEFINE_CLASS_1(zbpci, zbpci_driver, zbpci_methods, 0, pcib_driver);
280
281static devclass_t zbpci_devclass;
282
283DRIVER_MODULE(zbpci, zbbus, zbpci_driver, zbpci_devclass, 0, 0);
284