1 /* $NetBSD: mainbus_io.c,v 1.20 2009/11/07 07:27:41 cegger 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 1.20 2009/11/07 07:27:41 cegger 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(void *t, bus_addr_t bpa, bus_size_t size, int flags, bus_space_handle_t *bshp) 138 { 139 u_long startpa, endpa, pa; 140 vaddr_t va; 141 pt_entry_t *pte; 142 143 if ((u_long)bpa > (u_long)KERNEL_BASE) { 144 /* XXX This is a temporary hack to aid transition. */ 145 *bshp = bpa; 146 return(0); 147 } 148 149 startpa = trunc_page(bpa); 150 endpa = round_page(bpa + size); 151 152 /* XXX use extent manager to check duplicate mapping */ 153 154 va = uvm_km_alloc(kernel_map, endpa - startpa, 0, 155 UVM_KMF_VAONLY | UVM_KMF_NOWAIT); 156 if (! va) 157 return(ENOMEM); 158 159 *bshp = (bus_space_handle_t)(va + (bpa - startpa)); 160 161 for(pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) { 162 pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE, 0); 163 if ((flags & BUS_SPACE_MAP_CACHEABLE) == 0) { 164 pte = vtopte(va); 165 *pte &= ~L2_S_CACHE_MASK; 166 PTE_SYNC(pte); 167 } 168 } 169 pmap_update(pmap_kernel()); 170 171 return(0); 172 } 173 174 int 175 mainbus_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend, 176 bus_size_t size, bus_size_t alignment, bus_size_t boundary, 177 int cacheable, 178 bus_addr_t *bpap, bus_space_handle_t *bshp) 179 { 180 panic("mainbus_bs_alloc(): Help!"); 181 } 182 183 184 void 185 mainbus_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size) 186 { 187 /* 188 * Temporary implementation 189 */ 190 } 191 192 void 193 mainbus_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size) 194 { 195 196 panic("mainbus_bs_free(): Help!"); 197 /* mainbus_bs_unmap() does all that we need to do. */ 198 /* mainbus_bs_unmap(t, bsh, size);*/ 199 } 200 201 int 202 mainbus_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp) 203 { 204 205 *nbshp = bsh + (offset << 2); 206 return (0); 207 } 208 209 paddr_t 210 mainbus_bs_mmap(void *t, bus_addr_t paddr, off_t offset, int prot, int flags) 211 { 212 /* 213 * mmap from address `paddr+offset' for one page 214 */ 215 return (arm_btop((paddr + offset))); 216 } 217 218 void 219 mainbus_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset, bus_size_t len, int flags) 220 { 221 } 222 223 /* End of mainbus_io.c */ 224