1 /* $NetBSD: mainbus_io.c,v 1.17 2005/11/24 13:08:32 yamt Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Mark Brinicombe. 5 * 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 Mark Brinicombe. 18 * 4. The name of the company nor the name of the author may be used to 19 * endorse or promote products derived from this software without specific 20 * prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 26 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 27 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 28 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 /* 36 * bus_space I/O functions for mainbus 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: mainbus_io.c,v 1.17 2005/11/24 13:08:32 yamt Exp $"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/queue.h> 45 46 #include <uvm/uvm.h> 47 48 #include <machine/bus.h> 49 #include <machine/pmap.h> 50 51 /* Proto types for all the bus_space structure functions */ 52 53 bs_protos(mainbus); 54 bs_protos(bs_notimpl); 55 56 /* Declare the mainbus bus space tag */ 57 58 struct bus_space mainbus_bs_tag = { 59 /* cookie */ 60 NULL, 61 62 /* mapping/unmapping */ 63 mainbus_bs_map, 64 mainbus_bs_unmap, 65 mainbus_bs_subregion, 66 67 /* allocation/deallocation */ 68 mainbus_bs_alloc, 69 mainbus_bs_free, 70 71 /* get kernel virtual address */ 72 0, /* there is no linear mapping */ 73 74 /* Mmap bus space for user */ 75 mainbus_bs_mmap, 76 77 /* barrier */ 78 mainbus_bs_barrier, 79 80 /* read (single) */ 81 mainbus_bs_r_1, 82 mainbus_bs_r_2, 83 mainbus_bs_r_4, 84 bs_notimpl_bs_r_8, 85 86 /* read multiple */ 87 bs_notimpl_bs_rm_1, 88 mainbus_bs_rm_2, 89 bs_notimpl_bs_rm_4, 90 bs_notimpl_bs_rm_8, 91 92 /* read region */ 93 bs_notimpl_bs_rr_1, 94 bs_notimpl_bs_rr_2, 95 bs_notimpl_bs_rr_4, 96 bs_notimpl_bs_rr_8, 97 98 /* write (single) */ 99 mainbus_bs_w_1, 100 mainbus_bs_w_2, 101 mainbus_bs_w_4, 102 bs_notimpl_bs_w_8, 103 104 /* write multiple */ 105 mainbus_bs_wm_1, 106 mainbus_bs_wm_2, 107 bs_notimpl_bs_wm_4, 108 bs_notimpl_bs_wm_8, 109 110 /* write region */ 111 bs_notimpl_bs_wr_1, 112 bs_notimpl_bs_wr_2, 113 bs_notimpl_bs_wr_4, 114 bs_notimpl_bs_wr_8, 115 116 bs_notimpl_bs_sm_1, 117 bs_notimpl_bs_sm_2, 118 bs_notimpl_bs_sm_4, 119 bs_notimpl_bs_sm_8, 120 121 /* set region */ 122 bs_notimpl_bs_sr_1, 123 bs_notimpl_bs_sr_2, 124 bs_notimpl_bs_sr_4, 125 bs_notimpl_bs_sr_8, 126 127 /* copy */ 128 bs_notimpl_bs_c_1, 129 bs_notimpl_bs_c_2, 130 bs_notimpl_bs_c_4, 131 bs_notimpl_bs_c_8, 132 }; 133 134 /* bus space functions */ 135 136 int 137 mainbus_bs_map(t, bpa, size, flags, bshp) 138 void *t; 139 bus_addr_t bpa; 140 bus_size_t size; 141 int flags; 142 bus_space_handle_t *bshp; 143 { 144 u_long startpa, endpa, pa; 145 vaddr_t va; 146 pt_entry_t *pte; 147 148 if ((u_long)bpa > (u_long)KERNEL_BASE) { 149 /* XXX This is a temporary hack to aid transition. */ 150 *bshp = bpa; 151 return(0); 152 } 153 154 startpa = trunc_page(bpa); 155 endpa = round_page(bpa + size); 156 157 /* XXX use extent manager to check duplicate mapping */ 158 159 va = uvm_km_alloc(kernel_map, endpa - startpa, 0, 160 UVM_KMF_VAONLY | UVM_KMF_NOWAIT); 161 if (! va) 162 return(ENOMEM); 163 164 *bshp = (bus_space_handle_t)(va + (bpa - startpa)); 165 166 for(pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) { 167 pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE); 168 if ((flags & BUS_SPACE_MAP_CACHEABLE) == 0) { 169 pte = vtopte(va); 170 *pte &= ~L2_S_CACHE_MASK; 171 PTE_SYNC(pte); 172 } 173 } 174 pmap_update(pmap_kernel()); 175 176 return(0); 177 } 178 179 int 180 mainbus_bs_alloc(t, rstart, rend, size, alignment, boundary, cacheable, 181 bpap, bshp) 182 void *t; 183 bus_addr_t rstart, rend; 184 bus_size_t size, alignment, boundary; 185 int cacheable; 186 bus_addr_t *bpap; 187 bus_space_handle_t *bshp; 188 { 189 panic("mainbus_bs_alloc(): Help!"); 190 } 191 192 193 void 194 mainbus_bs_unmap(t, bsh, size) 195 void *t; 196 bus_space_handle_t bsh; 197 bus_size_t size; 198 { 199 /* 200 * Temporary implementation 201 */ 202 } 203 204 void 205 mainbus_bs_free(t, bsh, size) 206 void *t; 207 bus_space_handle_t bsh; 208 bus_size_t size; 209 { 210 211 panic("mainbus_bs_free(): Help!"); 212 /* mainbus_bs_unmap() does all that we need to do. */ 213 /* mainbus_bs_unmap(t, bsh, size);*/ 214 } 215 216 int 217 mainbus_bs_subregion(t, bsh, offset, size, nbshp) 218 void *t; 219 bus_space_handle_t bsh; 220 bus_size_t offset, size; 221 bus_space_handle_t *nbshp; 222 { 223 224 *nbshp = bsh + (offset << 2); 225 return (0); 226 } 227 228 paddr_t 229 mainbus_bs_mmap(t, paddr, offset, prot, flags) 230 void *t; 231 bus_addr_t paddr; 232 off_t offset; 233 int prot; 234 int flags; 235 { 236 /* 237 * mmap from address `paddr+offset' for one page 238 */ 239 return (arm_btop((paddr + offset))); 240 } 241 242 void 243 mainbus_bs_barrier(t, bsh, offset, len, flags) 244 void *t; 245 bus_space_handle_t bsh; 246 bus_size_t offset, len; 247 int flags; 248 { 249 } 250 251 /* End of mainbus_io.c */ 252