1 /* $NetBSD: mainbus_io.c,v 1.6 2001/11/23 17:23:42 thorpej 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/param.h> 40 #include <sys/systm.h> 41 #include <sys/queue.h> 42 43 #include <uvm/uvm.h> 44 45 #include <machine/bus.h> 46 #include <machine/pmap.h> 47 48 pt_entry_t *pmap_pte(pmap_t, vm_offset_t); 49 50 /* Proto types for all the bus_space structure functions */ 51 52 bs_protos(mainbus); 53 bs_protos(bs_notimpl); 54 55 /* Declare the mainbus bus space tag */ 56 57 struct bus_space mainbus_bs_tag = { 58 /* cookie */ 59 NULL, 60 61 /* mapping/unmapping */ 62 mainbus_bs_map, 63 mainbus_bs_unmap, 64 mainbus_bs_subregion, 65 66 /* allocation/deallocation */ 67 mainbus_bs_alloc, 68 mainbus_bs_free, 69 70 /* get kernel virtual address */ 71 0, /* there is no linear mapping */ 72 73 /* Mmap bus space for user */ 74 mainbus_bs_mmap, 75 76 /* barrier */ 77 mainbus_bs_barrier, 78 79 /* read (single) */ 80 mainbus_bs_r_1, 81 mainbus_bs_r_2, 82 mainbus_bs_r_4, 83 bs_notimpl_bs_r_8, 84 85 /* read multiple */ 86 bs_notimpl_bs_rm_1, 87 mainbus_bs_rm_2, 88 bs_notimpl_bs_rm_4, 89 bs_notimpl_bs_rm_8, 90 91 /* read region */ 92 bs_notimpl_bs_rr_1, 93 bs_notimpl_bs_rr_2, 94 bs_notimpl_bs_rr_4, 95 bs_notimpl_bs_rr_8, 96 97 /* write (single) */ 98 mainbus_bs_w_1, 99 mainbus_bs_w_2, 100 mainbus_bs_w_4, 101 bs_notimpl_bs_w_8, 102 103 /* write multiple */ 104 mainbus_bs_wm_1, 105 mainbus_bs_wm_2, 106 bs_notimpl_bs_wm_4, 107 bs_notimpl_bs_wm_8, 108 109 /* write region */ 110 bs_notimpl_bs_wr_1, 111 bs_notimpl_bs_wr_2, 112 bs_notimpl_bs_wr_4, 113 bs_notimpl_bs_wr_8, 114 115 bs_notimpl_bs_sm_1, 116 bs_notimpl_bs_sm_2, 117 bs_notimpl_bs_sm_4, 118 bs_notimpl_bs_sm_8, 119 120 /* set region */ 121 bs_notimpl_bs_sr_1, 122 bs_notimpl_bs_sr_2, 123 bs_notimpl_bs_sr_4, 124 bs_notimpl_bs_sr_8, 125 126 /* copy */ 127 bs_notimpl_bs_c_1, 128 bs_notimpl_bs_c_2, 129 bs_notimpl_bs_c_4, 130 bs_notimpl_bs_c_8, 131 }; 132 133 /* bus space functions */ 134 135 int 136 mainbus_bs_map(t, bpa, size, cacheable, bshp) 137 void *t; 138 bus_addr_t bpa; 139 bus_size_t size; 140 int cacheable; 141 bus_space_handle_t *bshp; 142 { 143 u_long startpa, endpa, pa; 144 vaddr_t va; 145 pt_entry_t *pte; 146 147 if ((u_long)bpa > (u_long)KERNEL_SPACE_START) { 148 /* XXX This is a temporary hack to aid transition. */ 149 *bshp = bpa; 150 return(0); 151 } 152 153 startpa = trunc_page(bpa); 154 endpa = round_page(bpa + size); 155 156 /* XXX use extent manager to check duplicate mapping */ 157 158 va = uvm_km_valloc(kernel_map, endpa - startpa); 159 if (! va) 160 return(ENOMEM); 161 162 *bshp = (bus_space_handle_t)(va + (bpa - startpa)); 163 164 for(pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) { 165 pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE); 166 pte = pmap_pte(pmap_kernel(), va); 167 if (cacheable) 168 *pte |= PT_CACHEABLE; 169 else 170 *pte &= ~PT_CACHEABLE; 171 } 172 pmap_update(pmap_kernel()); 173 174 return(0); 175 } 176 177 int 178 mainbus_bs_alloc(t, rstart, rend, size, alignment, boundary, cacheable, 179 bpap, bshp) 180 void *t; 181 bus_addr_t rstart, rend; 182 bus_size_t size, alignment, boundary; 183 int cacheable; 184 bus_addr_t *bpap; 185 bus_space_handle_t *bshp; 186 { 187 panic("mainbus_bs_alloc(): Help!\n"); 188 } 189 190 191 void 192 mainbus_bs_unmap(t, bsh, size) 193 void *t; 194 bus_space_handle_t bsh; 195 bus_size_t size; 196 { 197 /* 198 * Temporary implementation 199 */ 200 } 201 202 void 203 mainbus_bs_free(t, bsh, size) 204 void *t; 205 bus_space_handle_t bsh; 206 bus_size_t size; 207 { 208 209 panic("mainbus_bs_free(): Help!\n"); 210 /* mainbus_bs_unmap() does all that we need to do. */ 211 /* mainbus_bs_unmap(t, bsh, size);*/ 212 } 213 214 int 215 mainbus_bs_subregion(t, bsh, offset, size, nbshp) 216 void *t; 217 bus_space_handle_t bsh; 218 bus_size_t offset, size; 219 bus_space_handle_t *nbshp; 220 { 221 222 *nbshp = bsh + offset; 223 return (0); 224 } 225 226 paddr_t 227 mainbus_bs_mmap(t, paddr, offset, prot, flags) 228 void *t; 229 bus_addr_t paddr; 230 off_t offset; 231 int prot; 232 int flags; 233 { 234 /* 235 * mmap from address `paddr+offset' for one page 236 */ 237 return (arm_byte_to_page((paddr + offset))); 238 } 239 240 void 241 mainbus_bs_barrier(t, bsh, offset, len, flags) 242 void *t; 243 bus_space_handle_t bsh; 244 bus_size_t offset, len; 245 int flags; 246 { 247 } 248 249 /* End of mainbus_io.c */ 250