1 /* $NetBSD: pci_machdep.c,v 1.7 2023/12/20 14:18:37 thorpej Exp $ */
2
3 /*
4 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved.
5 * Copyright (c) 1994 Charles M. Hannum. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Charles M. Hannum.
18 * 4. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 /*
34 * Machine-specific functions for PCI autoconfiguration.
35 *
36 * On PCs, there are two methods of generating PCI configuration cycles.
37 * We try to detect the appropriate mechanism for this machine and set
38 * up a few function pointers to access the correct method directly.
39 *
40 * The configuration method can be hard-coded in the config file by
41 * using `options PCI_CONF_MODE=N', where `N' is the configuration mode
42 * as defined section 3.6.4.1, `Generating Configuration Cycles'.
43 */
44
45 #include <sys/cdefs.h>
46 __KERNEL_RCSID(0, "$NetBSD: pci_machdep.c,v 1.7 2023/12/20 14:18:37 thorpej Exp $");
47
48 #include <sys/param.h>
49 #include <sys/bus.h>
50 #include <sys/device.h>
51 #include <sys/errno.h>
52 #include <sys/extent.h>
53 #include <sys/intr.h>
54 #include <sys/queue.h>
55 #include <sys/systm.h>
56 #include <sys/time.h>
57
58 #include <uvm/uvm.h>
59
60 #define _POWERPC_BUS_DMA_PRIVATE
61
62 #include <dev/ic/cpc700reg.h>
63
64 #include <machine/pmppc.h>
65 #include <machine/pio.h>
66
67 #include <dev/pci/pcivar.h>
68 #include <dev/pci/pcireg.h>
69 #include <dev/pci/pcidevs.h>
70 #include <dev/pci/pciconf.h>
71
72 #include <evbppc/pmppc/dev/mainbus.h>
73
74 /*
75 * Address conversion as seen from a PCI master.
76 * XXX Shouldn't use 0x80000000, the actual value
77 * should come from the BAR.
78 */
79 #define PHYS_TO_PCI_MEM(x) ((x) + 0x80000000)
80 #define PCI_MEM_TO_PHYS(x) ((x) - 0x80000000)
81
82 static bus_addr_t phys_to_pci(bus_dma_tag_t, bus_addr_t);
83 static bus_addr_t pci_to_phys(bus_dma_tag_t, bus_addr_t);
84
85 extern struct powerpc_bus_dma_tag pci_bus_dma_tag;
86
87 void
pmppc_pci_get_chipset_tag(pci_chipset_tag_t pc)88 pmppc_pci_get_chipset_tag(pci_chipset_tag_t pc)
89 {
90 pc->pc_conf_v = (void *)pc;
91
92 pc->pc_attach_hook = genppc_pci_indirect_attach_hook;
93 pc->pc_bus_maxdevs = genppc_pci_bus_maxdevs;
94 pc->pc_make_tag = genppc_pci_indirect_make_tag;
95 pc->pc_conf_read = genppc_pci_indirect_conf_read;
96 pc->pc_conf_write = genppc_pci_indirect_conf_write;
97
98 pc->pc_intr_v = (void *)pc;
99
100 pc->pc_intr_map = pmppc_pci_intr_map;
101 pc->pc_intr_string = genppc_pci_intr_string;
102 pc->pc_intr_evcnt = genppc_pci_intr_evcnt;
103 pc->pc_intr_establish = genppc_pci_intr_establish;
104 pc->pc_intr_disestablish = genppc_pci_intr_disestablish;
105 pc->pc_intr_setattr = genppc_pci_intr_setattr;
106 pc->pc_intr_type = genppc_pci_intr_type;
107 pc->pc_intr_alloc = genppc_pci_intr_alloc;
108 pc->pc_intr_release = genppc_pci_intr_release;
109 pc->pc_intx_alloc = genppc_pci_intx_alloc;
110
111 pc->pc_msi_v = (void *)pc;
112 genppc_pci_chipset_msi_init(pc);
113
114 pc->pc_msix_v = (void *)pc;
115 genppc_pci_chipset_msix_init(pc);
116
117 pc->pc_conf_interrupt = pmppc_pci_conf_interrupt;
118 pc->pc_decompose_tag = genppc_pci_indirect_decompose_tag;
119 pc->pc_conf_hook = genppc_pci_conf_hook;
120
121 pc->pc_addr = mapiodev(CPC_PCICFGADR, 4, false);
122 pc->pc_data = mapiodev(CPC_PCICFGDATA, 4, false);
123 pc->pc_bus = 0;
124 pc->pc_node = 0;
125 pc->pc_memt = 0;
126 pc->pc_iot = 0;
127
128 /* the following two lines are required because unlike other ports,
129 * we cannot just add PHYS_TO_BUS_MEM/BUS_MEM_TO_PHYS defines to
130 * bus.h, because it would impact other evbppc ports.
131 */
132 pci_bus_dma_tag._dma_phys_to_bus_mem = phys_to_pci;
133 pci_bus_dma_tag._dma_bus_mem_to_phys = pci_to_phys;
134 }
135
136
137 static bus_addr_t
phys_to_pci(bus_dma_tag_t t,bus_addr_t a)138 phys_to_pci(bus_dma_tag_t t, bus_addr_t a)
139 {
140 return PHYS_TO_PCI_MEM(a);
141 }
142
pci_to_phys(bus_dma_tag_t t,bus_addr_t a)143 static bus_addr_t pci_to_phys(bus_dma_tag_t t, bus_addr_t a)
144 {
145 return PCI_MEM_TO_PHYS(a);
146 }
147
148 int
pmppc_pci_intr_map(const struct pci_attach_args * pa,pci_intr_handle_t * ihp)149 pmppc_pci_intr_map(const struct pci_attach_args *pa, pci_intr_handle_t *ihp)
150 {
151 int pin = pa->pa_intrpin;
152 int line = pa->pa_intrline;
153
154 if (pin == 0) {
155 /* No IRQ used. */
156 goto bad;
157 }
158
159 if (pin > 4) {
160 printf("pci_intr_map: bad interrupt pin %d\n", pin);
161 goto bad;
162 }
163
164 if (line == 255) {
165 printf("pci_intr_map: no mapping for pin %c\n", '@' + pin);
166 goto bad;
167 }
168 /*printf("pci_intr_map pin=%d line=%d\n", pin, line);*/
169
170 switch (line & 3) { /* XXX what should this be? */
171 case 0: *ihp = PMPPC_I_BPMC_INTA; break;
172 case 1: *ihp = PMPPC_I_BPMC_INTB; break;
173 case 2: *ihp = PMPPC_I_BPMC_INTC; break;
174 case 3: *ihp = PMPPC_I_BPMC_INTD; break;
175 }
176 return 0;
177
178 bad:
179 *ihp = -1;
180 return 1;
181 }
182
183 void
pmppc_pci_conf_interrupt(void * v,int bus,int dev,int pin,int swiz,int * iline)184 pmppc_pci_conf_interrupt(void *v, int bus, int dev, int pin, int swiz,
185 int *iline)
186 {
187 int line;
188
189 line = (swiz + dev) & 3;
190 /* XXX UGLY UGLY, figure out the real interrupt mapping */
191 if (bus==3&&dev==2&&pin==1&&swiz==3) line=2;
192 /*
193 printf("pci_conf_interrupt: bus=%d dev=%d pin=%d swiz=%d => line=%d\n",
194 bus, dev, pin, swiz, line);
195 */
196 *iline = line;
197 }
198