1 /* $NetBSD: at91_bus_space.c,v 1.6 2023/04/21 15:00:48 skrll 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 * 20 * THIS SOFTWARE IS PROVIDED BY ICHIRO FUKUHARA ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL ICHIRO FUKUHARA OR THE VOICES IN HIS HEAD BE LIABLE FOR 24 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: at91_bus_space.c,v 1.6 2023/04/21 15:00:48 skrll Exp $"); 35 36 /* 37 * bus_space I/O functions for ep93xx 38 */ 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/queue.h> 43 44 #include <uvm/uvm.h> 45 46 #include <sys/bus.h> 47 48 #include <arm/at91/at91var.h> 49 //#include <arm/ep93xx/ep93xxreg.h> 50 //#include <arm/ep93xx/ep93xxvar.h> 51 52 /* Proto types for all the bus_space structure functions */ 53 bs_protos(at91); 54 bs_protos(generic); 55 bs_protos(generic_armv4); 56 bs_protos(bs_notimpl); 57 58 struct bus_space at91_bs_tag = { 59 /* cookie */ 60 .bs_cookie = (void *) 0, 61 62 /* mapping/unmapping */ 63 .bs_map = at91_bs_map, 64 .bs_unmap = at91_bs_unmap, 65 .bs_subregion = at91_bs_subregion, 66 67 /* allocation/deallocation */ 68 .bs_alloc = at91_bs_alloc, 69 .bs_free = at91_bs_free, 70 71 /* get kernel virtual address */ 72 .bs_vaddr = at91_bs_vaddr, 73 74 /* mmap bus space for userland */ 75 .bs_mmap = at91_bs_mmap, 76 77 /* barrier */ 78 .bs_barrier = at91_bs_barrier, 79 80 /* read (single) */ 81 .bs_r_1 = generic_bs_r_1, 82 .bs_r_2 = generic_armv4_bs_r_2, 83 .bs_r_4 = generic_bs_r_4, 84 .bs_r_8 = bs_notimpl_bs_r_8, 85 86 /* read multiple */ 87 .bs_rm_1 = generic_bs_rm_1, 88 .bs_rm_2 = generic_armv4_bs_rm_2, 89 .bs_rm_4 = generic_bs_rm_4, 90 .bs_rm_8 = bs_notimpl_bs_rm_8, 91 92 /* read region */ 93 .bs_rr_1 = generic_bs_rr_1, 94 .bs_rr_2 = generic_armv4_bs_rr_2, 95 .bs_rr_4 = generic_bs_rr_4, 96 .bs_rr_8 = bs_notimpl_bs_rr_8, 97 98 /* write (single) */ 99 .bs_w_1 = generic_bs_w_1, 100 .bs_w_2 = generic_armv4_bs_w_2, 101 .bs_w_4 = generic_bs_w_4, 102 .bs_w_8 = bs_notimpl_bs_w_8, 103 104 /* write multiple */ 105 .bs_wm_1 = generic_bs_wm_1, 106 .bs_wm_2 = generic_armv4_bs_wm_2, 107 .bs_wm_4 = generic_bs_wm_4, 108 .bs_wm_8 = bs_notimpl_bs_wm_8, 109 110 /* write region */ 111 .bs_wr_1 = generic_bs_wr_1, 112 .bs_wr_2 = generic_armv4_bs_wr_2, 113 .bs_wr_4 = generic_bs_wr_4, 114 .bs_wr_8 = bs_notimpl_bs_wr_8, 115 116 /* set multiple */ 117 .bs_sm_1 = bs_notimpl_bs_sm_1, 118 .bs_sm_2 = bs_notimpl_bs_sm_2, 119 .bs_sm_4 = bs_notimpl_bs_sm_4, 120 .bs_sm_8 = bs_notimpl_bs_sm_8, 121 122 /* set region */ 123 .bs_sr_1 = bs_notimpl_bs_sr_1, 124 .bs_sr_2 = generic_armv4_bs_sr_2, 125 .bs_sr_4 = generic_bs_sr_4, 126 .bs_sr_8 = bs_notimpl_bs_sr_8, 127 128 /* copy */ 129 .bs_c_1 = bs_notimpl_bs_c_1, 130 .bs_c_2 = generic_armv4_bs_c_2, 131 .bs_c_4 = bs_notimpl_bs_c_4, 132 .bs_c_8 = bs_notimpl_bs_c_8, 133 }; 134 135 int 136 at91_bs_map(void *t, bus_addr_t bpa, bus_size_t size, 137 int cacheable, bus_space_handle_t *bshp) 138 { 139 const struct pmap_devmap *pd; 140 141 paddr_t startpa; 142 paddr_t endpa; 143 paddr_t pa; 144 paddr_t offset; 145 vaddr_t va; 146 147 if ((pd = pmap_devmap_find_pa(bpa, size)) != NULL) { 148 /* Device was statically mapped. */ 149 *bshp = pd->pd_va + (bpa - pd->pd_pa); 150 return 0; 151 } 152 153 endpa = round_page(bpa + size); 154 offset = bpa & PAGE_MASK; 155 startpa = trunc_page(bpa); 156 157 /* Get some VM. */ 158 va = uvm_km_alloc(kernel_map, endpa - startpa, 0, 159 UVM_KMF_VAONLY | UVM_KMF_NOWAIT); 160 if (va == 0) 161 return ENOMEM; 162 163 /* Store the bus space handle */ 164 *bshp = va + offset; 165 166 /* Now map the pages */ 167 for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) { 168 pmap_enter(pmap_kernel(), va, pa, 169 VM_PROT_READ | VM_PROT_WRITE, 170 VM_PROT_READ | VM_PROT_WRITE | PMAP_WIRED); 171 } 172 pmap_update(pmap_kernel()); 173 174 return(0); 175 } 176 177 void 178 at91_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size) 179 { 180 vaddr_t va; 181 vaddr_t endva; 182 183 if (pmap_devmap_find_va(bsh, size) != NULL) { 184 /* Device was statically mapped; nothing to do. */ 185 return; 186 } 187 188 endva = round_page(bsh + size); 189 va = trunc_page(bsh); 190 191 pmap_remove(pmap_kernel(), va, endva); 192 pmap_update(pmap_kernel()); 193 uvm_km_free(kernel_map, va, endva - va, UVM_KMF_VAONLY); 194 } 195 196 int 197 at91_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend, 198 bus_size_t size, bus_size_t alignment, bus_size_t boundary, int cacheable, 199 bus_addr_t *bpap, bus_space_handle_t *bshp) 200 { 201 panic("at91_bs_alloc(): not implemented\n"); 202 } 203 204 void 205 at91_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size) 206 { 207 panic("at91_bs_free(): not implemented\n"); 208 } 209 210 int 211 at91_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset, 212 bus_size_t size, bus_space_handle_t *nbshp) 213 { 214 *nbshp = bsh + offset; 215 return (0); 216 } 217 218 void * 219 at91_bs_vaddr(void *t, bus_space_handle_t bsh) 220 { 221 return ((void *)bsh); 222 } 223 224 paddr_t 225 at91_bs_mmap(void *t, bus_addr_t addr, off_t off, int prot, int flags) 226 { 227 /* Not supported. */ 228 return (-1); 229 } 230 231 void 232 at91_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset, 233 bus_size_t len, int flags) 234 { 235 /* NULL */ 236 } 237 /* End of at91_io.c */ 238
Indexes created Sat Sep 20 22:09:52 GMT 2025