at91_bus_space.c revision 1.2
1 /* $NetBSD: at91_bus_space.c,v 1.2 2008/07/03 01:15:38 matt Exp $ */ 2 3 /* 4 * Based on ep93xx_space.c 5 * Copyright (c) 2007 Embedtronics Oy 6 * All rights reserved. 7 * 8 * Copyright (c) 2004 Jesse Off 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by Ichiro FUKUHARA. 22 * 4. The name of the company nor the name of the author may be used to 23 * endorse or promote products derived from this software without specific 24 * prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY ICHIRO FUKUHARA ``AS IS'' AND ANY EXPRESS OR 27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL ICHIRO FUKUHARA OR THE VOICES IN HIS HEAD BE LIABLE FOR 30 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: at91_bus_space.c,v 1.2 2008/07/03 01:15:38 matt Exp $"); 41 42 /* 43 * bus_space I/O functions for ep93xx 44 */ 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/queue.h> 49 50 #include <uvm/uvm.h> 51 52 #include <machine/bus.h> 53 54 #include <arm/at91/at91var.h> 55 //#include <arm/ep93xx/ep93xxreg.h> 56 //#include <arm/ep93xx/ep93xxvar.h> 57 58 /* Proto types for all the bus_space structure functions */ 59 bs_protos(at91); 60 bs_protos(generic); 61 bs_protos(generic_armv4); 62 bs_protos(bs_notimpl); 63 64 struct bus_space at91_bs_tag = { 65 /* cookie */ 66 (void *) 0, 67 68 /* mapping/unmapping */ 69 at91_bs_map, 70 at91_bs_unmap, 71 at91_bs_subregion, 72 73 /* allocation/deallocation */ 74 at91_bs_alloc, 75 at91_bs_free, 76 77 /* get kernel virtual address */ 78 at91_bs_vaddr, 79 80 /* mmap bus space for userland */ 81 at91_bs_mmap, 82 83 /* barrier */ 84 at91_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 generic_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 generic_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 generic_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 int 142 at91_bs_map(void *t, bus_addr_t bpa, bus_size_t size, 143 int cacheable, bus_space_handle_t *bshp) 144 { 145 const struct pmap_devmap *pd; 146 147 paddr_t startpa; 148 paddr_t endpa; 149 paddr_t pa; 150 paddr_t offset; 151 vaddr_t va; 152 153 if ((pd = pmap_devmap_find_pa(bpa, size)) != NULL) { 154 /* Device was statically mapped. */ 155 *bshp = pd->pd_va + (bpa - pd->pd_pa); 156 return 0; 157 } 158 159 endpa = round_page(bpa + size); 160 offset = bpa & PAGE_MASK; 161 startpa = trunc_page(bpa); 162 163 /* Get some VM. */ 164 va = uvm_km_alloc(kernel_map, endpa - startpa, 0, 165 UVM_KMF_VAONLY | UVM_KMF_NOWAIT); 166 if (va == 0) 167 return ENOMEM; 168 169 /* Store the bus space handle */ 170 *bshp = va + offset; 171 172 /* Now map the pages */ 173 for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) { 174 pmap_enter(pmap_kernel(), va, pa, 175 VM_PROT_READ | VM_PROT_WRITE, 176 VM_PROT_READ | VM_PROT_WRITE | PMAP_WIRED); 177 } 178 pmap_update(pmap_kernel()); 179 180 return(0); 181 } 182 183 void 184 at91_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size) 185 { 186 vaddr_t va; 187 vaddr_t endva; 188 189 if (pmap_devmap_find_va(bsh, size) != NULL) { 190 /* Device was statically mapped; nothing to do. */ 191 return; 192 } 193 194 endva = round_page(bsh + size); 195 va = trunc_page(bsh); 196 197 pmap_remove(pmap_kernel(), va, endva); 198 pmap_update(pmap_kernel()); 199 uvm_km_free(kernel_map, va, endva - va, UVM_KMF_VAONLY); 200 } 201 202 int 203 at91_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend, 204 bus_size_t size, bus_size_t alignment, bus_size_t boundary, int cacheable, 205 bus_addr_t *bpap, bus_space_handle_t *bshp) 206 { 207 panic("at91_bs_alloc(): not implemented\n"); 208 } 209 210 void 211 at91_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size) 212 { 213 panic("at91_bs_free(): not implemented\n"); 214 } 215 216 int 217 at91_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset, 218 bus_size_t size, bus_space_handle_t *nbshp) 219 { 220 *nbshp = bsh + offset; 221 return (0); 222 } 223 224 void * 225 at91_bs_vaddr(void *t, bus_space_handle_t bsh) 226 { 227 return ((void *)bsh); 228 } 229 230 paddr_t 231 at91_bs_mmap(void *t, bus_addr_t addr, off_t off, int prot, int flags) 232 { 233 /* Not supported. */ 234 return (-1); 235 } 236 237 void 238 at91_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset, 239 bus_size_t len, int flags) 240 { 241 /* NULL */ 242 } 243 /* End of at91_io.c */ 244
Indexes created Wed Sep 24 05:09:52 GMT 2025