ttwoga_pci.c revision 1.1
1 /* $NetBSD: ttwoga_pci.c,v 1.1 2000/12/21 20:51:55 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1999, 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 40 41 __KERNEL_RCSID(0, "$NetBSD: ttwoga_pci.c,v 1.1 2000/12/21 20:51:55 thorpej Exp $"); 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/kernel.h> 46 #include <sys/device.h> 47 #include <sys/lock.h> 48 49 #include <dev/pci/pcireg.h> 50 #include <dev/pci/pcivar.h> 51 52 #include <alpha/pci/ttwogareg.h> 53 #include <alpha/pci/ttwogavar.h> 54 55 void ttwoga_attach_hook(struct device *, struct device *, 56 struct pcibus_attach_args *); 57 int ttwoga_bus_maxdevs(void *, int); 58 pcitag_t ttwoga_make_tag(void *, int, int, int); 59 void ttwoga_decompose_tag(void *, pcitag_t, int *, int *, 60 int *); 61 pcireg_t ttwoga_conf_read(void *, pcitag_t, int); 62 void ttwoga_conf_write(void *, pcitag_t, int, pcireg_t); 63 64 paddr_t ttwoga_make_type0addr(int, int); 65 66 /* 67 * The T2 has an annoying bug that can manifest itself while 68 * probing for devices. If a non-existent CBUS address is 69 * accessed with a read, "a few" subsequent write cycles 70 * will generate spurious memory errors. We work around this 71 * by tracking which CPU has the PCI configuration mutex and 72 * "expect" machine checks on that CPU for the duraction of 73 * the PCI configuration access routine. 74 */ 75 76 struct simplelock ttwoga_conf_slock; 77 cpuid_t ttwoga_conf_cpu; /* XXX core logic bug */ 78 79 #define TTWOGA_CONF_LOCK(s) \ 80 do { \ 81 (s) = splhigh(); \ 82 simple_lock(&ttwoga_conf_slock); \ 83 ttwoga_conf_cpu = cpu_number(); \ 84 } while (0) 85 86 #define TTWOGA_CONF_UNLOCK(s) \ 87 do { \ 88 ttwoga_conf_cpu = (cpuid_t)-1; \ 89 simple_unlock(&ttwoga_conf_slock); \ 90 splx((s)); \ 91 } while (0) 92 93 void 94 ttwoga_pci_init(pci_chipset_tag_t pc, void *v) 95 { 96 97 simple_lock_init(&ttwoga_conf_slock); 98 99 pc->pc_conf_v = v; 100 pc->pc_attach_hook = ttwoga_attach_hook; 101 pc->pc_bus_maxdevs = ttwoga_bus_maxdevs; 102 pc->pc_make_tag = ttwoga_make_tag; 103 pc->pc_decompose_tag = ttwoga_decompose_tag; 104 pc->pc_conf_read = ttwoga_conf_read; 105 pc->pc_conf_write = ttwoga_conf_write; 106 } 107 108 void 109 ttwoga_attach_hook(struct device *parent, struct device *self, 110 struct pcibus_attach_args *pba) 111 { 112 } 113 114 int 115 ttwoga_bus_maxdevs(void *cpv, int busno) 116 { 117 118 return 32; 119 } 120 121 pcitag_t 122 ttwoga_make_tag(void *cpv, int b, int d, int f) 123 { 124 125 /* This is the format used for Type 1 configuration cycles. */ 126 return (b << 16) | (d << 11) | (f << 8); 127 } 128 129 void 130 ttwoga_decompose_tag(void *cpv, pcitag_t tag, int *bp, int *dp, int *fp) 131 { 132 133 if (bp != NULL) 134 *bp = (tag >> 16) & 0xff; 135 if (dp != NULL) 136 *dp = (tag >> 11) & 0x1f; 137 if (fp != NULL) 138 *fp = (tag >> 8) & 0x7; 139 } 140 141 paddr_t 142 ttwoga_make_type0addr(int d, int f) 143 { 144 145 if (d > 8) /* XXX ??? */ 146 return ((paddr_t) -1); 147 return ((0x0800UL << d) | (f << 8)); 148 } 149 150 pcireg_t 151 ttwoga_conf_read(void *cpv, pcitag_t tag, int offset) 152 { 153 struct ttwoga_config *tcp = cpv; 154 pcireg_t *datap, data; 155 int s, b, d, f, ba; 156 paddr_t addr; 157 u_int64_t old_hae3; 158 159 alpha_pci_decompose_tag(&tcp->tc_pc, tag, &b, &d, &f); 160 161 addr = b ? tag : ttwoga_make_type0addr(d, f); 162 if (addr == (paddr_t)-1) 163 return ((pcireg_t) -1); 164 165 TTWOGA_CONF_LOCK(s); 166 167 alpha_mb(); 168 old_hae3 = T2GA(tcp, T2_HAE0_3) & ~HAE0_3_PCA; 169 T2GA(tcp, T2_HAE0_3) = 170 old_hae3 | ((b ? 1UL : 0UL) << HAE0_3_PCA_SHIFT); 171 alpha_mb(); 172 alpha_mb(); 173 174 datap = 175 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(tcp->tc_sysmap->tsmap_conf_base | 176 addr << 5UL | /* address shift */ 177 (offset & ~0x03) << 5UL | /* address shift */ 178 0x3 << 3UL); /* 4-byte, size shift */ 179 data = (pcireg_t)-1; 180 if (!(ba = badaddr(datap, sizeof *datap))) 181 data = *datap; 182 183 alpha_mb(); 184 T2GA(tcp, T2_HAE0_3) = old_hae3; 185 alpha_mb(); 186 alpha_mb(); 187 188 alpha_pal_draina(); 189 alpha_mb(); 190 alpha_mb(); 191 192 TTWOGA_CONF_UNLOCK(s); 193 194 #if 0 195 printf("ttwoga_conf_read: tag 0x%lx, reg 0x%x -> 0x%x @ %p%s\n", 196 tag, offset, data, datap, ba ? " (badaddr)" : ""); 197 #endif 198 199 return (data); 200 } 201 202 void 203 ttwoga_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data) 204 { 205 struct ttwoga_config *tcp = cpv; 206 pcireg_t *datap; 207 int s, b, d, f; 208 paddr_t addr; 209 u_int64_t old_hae3; 210 211 alpha_pci_decompose_tag(&tcp->tc_pc, tag, &b, &d, &f); 212 213 addr = b ? tag : ttwoga_make_type0addr(d, f); 214 if (addr == (paddr_t)-1) 215 return; 216 217 TTWOGA_CONF_LOCK(s); 218 219 alpha_mb(); 220 old_hae3 = T2GA(tcp, T2_HAE0_3) & ~HAE0_3_PCA; 221 T2GA(tcp, T2_HAE0_3) = 222 old_hae3 | ((b ? 1UL : 0UL) << HAE0_3_PCA_SHIFT); 223 alpha_mb(); 224 alpha_mb(); 225 226 datap = 227 (pcireg_t *)ALPHA_PHYS_TO_K0SEG(tcp->tc_sysmap->tsmap_conf_base | 228 addr << 5UL | /* address shift */ 229 (offset & ~0x03) << 5UL | /* address shift */ 230 0x3 << 3UL); /* 4-byte, size shift */ 231 232 alpha_mb(); 233 *datap = data; 234 alpha_mb(); 235 alpha_mb(); 236 237 alpha_mb(); 238 T2GA(tcp, T2_HAE0_3) = old_hae3; 239 alpha_mb(); 240 alpha_mb(); 241 242 TTWOGA_CONF_UNLOCK(s); 243 244 #if 0 245 printf("ttwoga_conf_write: tag 0x%lx, reg 0x%x -> 0x%x @ %p\n", 246 tag, offset, data, datap); 247 #endif 248 } 249
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