ifpga_io.c revision 1.9
1 /* $NetBSD: ifpga_io.c,v 1.9 2009/03/14 21:04:08 dsl Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Causality Limited 5 * Copyright (c) 1997 Mark Brinicombe. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Mark Brinicombe 19 * for the NetBSD Project. 20 * 4. The name of the company nor the name of the author may be used to 21 * endorse or promote products derived from this software without specific 22 * prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 28 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 29 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 30 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * From arm/footbridge/footbridge_io.c 37 */ 38 39 /* 40 * bus_space I/O functions for IFPGA 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: ifpga_io.c,v 1.9 2009/03/14 21:04:08 dsl Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <machine/bus.h> 49 #include <uvm/uvm_extern.h> 50 51 #include <evbarm/ifpga/ifpgavar.h> 52 53 /* Proto types for all the bus_space structure functions */ 54 55 bs_protos(ifpga); 56 bs_protos(generic); 57 bs_protos(generic_armv4); 58 bs_protos(bs_notimpl); 59 bs_map_proto(ifpga_mem); 60 bs_unmap_proto(ifpga_mem); 61 62 /* Declare the ifpga bus space tag */ 63 64 struct bus_space ifpga_bs_tag = { 65 /* cookie */ 66 (void *) 0, /* Physical base address */ 67 68 /* mapping/unmapping */ 69 ifpga_bs_map, 70 ifpga_bs_unmap, 71 ifpga_bs_subregion, 72 73 /* allocation/deallocation */ 74 ifpga_bs_alloc, 75 ifpga_bs_free, 76 77 /* get kernel virtual address */ 78 ifpga_bs_vaddr, 79 80 /* mmap */ 81 bs_notimpl_bs_mmap, 82 83 /* barrier */ 84 ifpga_bs_barrier, 85 86 /* read (single) */ 87 generic_bs_r_1, 88 generic_armv4_bs_r_2, 89 generic_bs_r_4, 90 bs_notimpl_bs_r_8, 91 92 /* read multiple */ 93 generic_bs_rm_1, 94 generic_armv4_bs_rm_2, 95 generic_bs_rm_4, 96 bs_notimpl_bs_rm_8, 97 98 /* read region */ 99 bs_notimpl_bs_rr_1, 100 generic_armv4_bs_rr_2, 101 generic_bs_rr_4, 102 bs_notimpl_bs_rr_8, 103 104 /* write (single) */ 105 generic_bs_w_1, 106 generic_armv4_bs_w_2, 107 generic_bs_w_4, 108 bs_notimpl_bs_w_8, 109 110 /* write multiple */ 111 generic_bs_wm_1, 112 generic_armv4_bs_wm_2, 113 generic_bs_wm_4, 114 bs_notimpl_bs_wm_8, 115 116 /* write region */ 117 bs_notimpl_bs_wr_1, 118 generic_armv4_bs_wr_2, 119 generic_bs_wr_4, 120 bs_notimpl_bs_wr_8, 121 122 /* set multiple */ 123 bs_notimpl_bs_sm_1, 124 bs_notimpl_bs_sm_2, 125 bs_notimpl_bs_sm_4, 126 bs_notimpl_bs_sm_8, 127 128 /* set region */ 129 bs_notimpl_bs_sr_1, 130 generic_armv4_bs_sr_2, 131 bs_notimpl_bs_sr_4, 132 bs_notimpl_bs_sr_8, 133 134 /* copy */ 135 bs_notimpl_bs_c_1, 136 generic_armv4_bs_c_2, 137 bs_notimpl_bs_c_4, 138 bs_notimpl_bs_c_8, 139 }; 140 141 void ifpga_create_io_bs_tag(t, cookie) 142 struct bus_space *t; 143 void *cookie; 144 { 145 *t = ifpga_bs_tag; 146 t->bs_cookie = cookie; 147 } 148 149 void ifpga_create_mem_bs_tag(t, cookie) 150 struct bus_space *t; 151 void *cookie; 152 { 153 *t = ifpga_bs_tag; 154 t->bs_map = ifpga_mem_bs_map; 155 t->bs_unmap = ifpga_mem_bs_unmap; 156 t->bs_cookie = cookie; 157 } 158 159 /* bus space functions */ 160 161 int 162 ifpga_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int cacheable, bus_space_handle_t *bshp) 163 { 164 /* The cookie is the base address for the I/O area */ 165 *bshp = bpa + (bus_addr_t)t; 166 return 0; 167 } 168 169 int 170 ifpga_mem_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int cacheable, bus_space_handle_t *bshp) 171 { 172 bus_addr_t startpa, endpa; 173 vaddr_t va; 174 175 /* Round the allocation to page boundries */ 176 startpa = trunc_page(bpa); 177 endpa = round_page(bpa + size); 178 179 /* Get some VM. */ 180 va = uvm_km_alloc(kernel_map, endpa - startpa, 0, 181 UVM_KMF_VAONLY | UVM_KMF_NOWAIT); 182 if (va == 0) 183 return ENOMEM; 184 185 /* Store the bus space handle */ 186 *bshp = va + (bpa & PGOFSET); 187 188 /* Now map the pages */ 189 /* The cookie is the physical base address for the I/O area */ 190 while (startpa < endpa) { 191 /* XXX pmap_kenter_pa maps pages cacheable -- not what 192 we want. */ 193 pmap_enter(pmap_kernel(), va, (bus_addr_t)t + startpa, 194 VM_PROT_READ | VM_PROT_WRITE, 0); 195 va += PAGE_SIZE; 196 startpa += PAGE_SIZE; 197 } 198 pmap_update(pmap_kernel()); 199 200 return 0; 201 } 202 203 int 204 ifpga_bs_alloc(t, rstart, rend, size, alignment, boundary, cacheable, 205 bpap, bshp) 206 void *t; 207 bus_addr_t rstart, rend; 208 bus_size_t size, alignment, boundary; 209 int cacheable; 210 bus_addr_t *bpap; 211 bus_space_handle_t *bshp; 212 { 213 panic("ifpga_alloc(): Help!"); 214 } 215 216 217 void 218 ifpga_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size) 219 { 220 /* Nothing to do for an io map. */ 221 } 222 223 void 224 ifpga_mem_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size) 225 { 226 vaddr_t startva, endva; 227 228 startva = trunc_page(bsh); 229 endva = round_page(bsh + size); 230 231 pmap_remove(pmap_kernel(), startva, endva); 232 pmap_update(pmap_kernel()); 233 uvm_km_free(kernel_map, startva, endva - startva, UVM_KMF_VAONLY); 234 } 235 236 void 237 ifpga_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size) 238 { 239 240 panic("ifpga_free(): Help!"); 241 /* ifpga_bs_unmap() does all that we need to do. */ 242 /* ifpga_bs_unmap(t, bsh, size);*/ 243 } 244 245 int 246 ifpga_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp) 247 { 248 249 *nbshp = bsh + (offset << ((int)t)); 250 return (0); 251 } 252 253 void * 254 ifpga_bs_vaddr(void *t, bus_space_handle_t bsh) 255 { 256 257 return ((void *)bsh); 258 } 259 260 void 261 ifpga_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset, bus_size_t len, int flags) 262 { 263 } 264
Indexes created Mon Oct 20 11:09:49 GMT 2025