bcmgen_space.c revision 1.1
1/* $NetBSD: bcmgen_space.c,v 1.1 2012/09/01 00:04:44 matt Exp $ */ 2 3/*- 4 * Copyright (c) 2012 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Nick Hudson 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 33#include <sys/cdefs.h> 34__KERNEL_RCSID(0, "$NetBSD: bcmgen_space.c,v 1.1 2012/09/01 00:04:44 matt Exp $"); 35 36#include <sys/param.h> 37#include <sys/systm.h> 38 39#include <uvm/uvm_extern.h> 40 41#include <sys/bus.h> 42 43/* Prototypes for all the bus_space structure functions */ 44bs_protos(bcmgen); 45bs_protos(generic); 46bs_protos(generic_armv4); 47bs_protos(bs_notimpl); 48 49struct bus_space bcmgen_bs_tag = { 50 /* cookie */ 51 (void *) 0, 52 53 /* mapping/unmapping */ 54 bcmgen_bs_map, 55 bcmgen_bs_unmap, 56 bcmgen_bs_subregion, 57 58 /* allocation/deallocation */ 59 bcmgen_bs_alloc, /* not implemented */ 60 bcmgen_bs_free, /* not implemented */ 61 62 /* get kernel virtual address */ 63 bcmgen_bs_vaddr, 64 65 /* mmap */ 66 bs_notimpl_bs_mmap, 67 68 /* barrier */ 69 bcmgen_bs_barrier, 70 71 /* read (single) */ 72 generic_bs_r_1, 73 generic_armv4_bs_r_2, 74 generic_bs_r_4, 75 bs_notimpl_bs_r_8, 76 77 /* read multiple */ 78 generic_bs_rm_1, 79 generic_armv4_bs_rm_2, 80 generic_bs_rm_4, 81 bs_notimpl_bs_rm_8, 82 83 /* read region */ 84 generic_bs_rr_1, 85 generic_armv4_bs_rr_2, 86 generic_bs_rr_4, 87 bs_notimpl_bs_rr_8, 88 89 /* write (single) */ 90 generic_bs_w_1, 91 generic_armv4_bs_w_2, 92 generic_bs_w_4, 93 bs_notimpl_bs_w_8, 94 95 /* write multiple */ 96 generic_bs_wm_1, 97 generic_armv4_bs_wm_2, 98 generic_bs_wm_4, 99 bs_notimpl_bs_wm_8, 100 101 /* write region */ 102 generic_bs_wr_1, 103 generic_armv4_bs_wr_2, 104 generic_bs_wr_4, 105 bs_notimpl_bs_wr_8, 106 107 /* set multiple */ 108 bs_notimpl_bs_sm_1, 109 bs_notimpl_bs_sm_2, 110 bs_notimpl_bs_sm_4, 111 bs_notimpl_bs_sm_8, 112 113 /* set region */ 114 generic_bs_sr_1, 115 generic_armv4_bs_sr_2, 116 bs_notimpl_bs_sr_4, 117 bs_notimpl_bs_sr_8, 118 119 /* copy */ 120 bs_notimpl_bs_c_1, 121 generic_armv4_bs_c_2, 122 bs_notimpl_bs_c_4, 123 bs_notimpl_bs_c_8, 124 125#ifdef __BUS_SPACE_HAS_STREAM_METHODS 126 /* read (single) */ 127 generic_bs_r_1, 128 generic_armv4_bs_r_2, 129 generic_bs_r_4, 130 bs_notimpl_bs_r_8, 131 132 /* read multiple */ 133 generic_bs_rm_1, 134 generic_armv4_bs_rm_2, 135 generic_bs_rm_4, 136 bs_notimpl_bs_rm_8, 137 138 /* read region */ 139 generic_bs_rr_1, 140 generic_armv4_bs_rr_2, 141 generic_bs_rr_4, 142 bs_notimpl_bs_rr_8, 143 144 /* write (single) */ 145 generic_bs_w_1, 146 generic_armv4_bs_w_2, 147 generic_bs_w_4, 148 bs_notimpl_bs_w_8, 149 150 /* write multiple */ 151 generic_bs_wm_1, 152 generic_armv4_bs_wm_2, 153 generic_bs_wm_4, 154 bs_notimpl_bs_wm_8, 155 156 /* write region */ 157 generic_bs_wr_1, 158 generic_armv4_bs_wr_2, 159 generic_bs_wr_4, 160 bs_notimpl_bs_wr_8, 161#endif 162}; 163 164int 165bcmgen_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int flag, 166 bus_space_handle_t *bshp) 167{ 168 u_long startpa, endpa, pa; 169 const struct pmap_devmap *pd; 170 vaddr_t va; 171 172 if ((pd = pmap_devmap_find_pa(bpa, size)) != NULL) { 173 /* Device was statically mapped. */ 174 *bshp = pd->pd_va + (bpa - pd->pd_pa); 175 return 0; 176 } 177 178 startpa = trunc_page(bpa); 179 endpa = round_page(bpa + size); 180 181 /* XXX use extent manager to check duplicate mapping */ 182 183 va = uvm_km_alloc(kernel_map, endpa - startpa, 0, 184 UVM_KMF_VAONLY | UVM_KMF_NOWAIT); 185 if (!va) 186 return ENOMEM; 187 188 *bshp = (bus_space_handle_t)(va + (bpa - startpa)); 189 190 const int pmapflags = (flag & BUS_SPACE_MAP_CACHEABLE) ? 0 : PMAP_NOCACHE; 191 for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) { 192 pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE, pmapflags); 193 } 194 pmap_update(pmap_kernel()); 195 196 return 0; 197} 198 199void 200bcmgen_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size) 201{ 202 vaddr_t va; 203 vsize_t sz; 204 205 if (pmap_devmap_find_va(bsh, size) != NULL) { 206 /* Device was statically mapped; nothing to do. */ 207 return; 208 } 209 210 va = trunc_page(bsh); 211 sz = round_page(bsh + size) - va; 212 213 pmap_kremove(va, sz); 214 pmap_update(pmap_kernel()); 215 uvm_km_free(kernel_map, va, sz, UVM_KMF_VAONLY); 216} 217 218 219int 220bcmgen_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset, 221 bus_size_t size, bus_space_handle_t *nbshp) 222{ 223 224 *nbshp = bsh + offset; 225 return (0); 226} 227 228void 229bcmgen_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset, 230 bus_size_t len, int flags) 231{ 232 flags &= BUS_SPACE_BARRIER_READ|BUS_SPACE_BARRIER_WRITE; 233 234 if (flags) { 235 /* Issue an ARM11 Data Syncronisation Barrier (DSB) */ 236#ifdef _ARM_ARCH_7 237 __asm __volatile("dsb"); 238#else 239 __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" : : "r" (0) 240 : "memory"); 241#endif 242 return; 243 } 244 245} 246 247void * 248bcmgen_bs_vaddr(void *t, bus_space_handle_t bsh) 249{ 250 251 return (void *)bsh; 252} 253 254 255int 256bcmgen_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend, 257 bus_size_t size, bus_size_t alignment, bus_size_t boundary, int flags, 258 bus_addr_t *bpap, bus_space_handle_t *bshp) 259{ 260 261 panic("%s(): not implemented\n", __func__); 262} 263 264void 265bcmgen_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size) 266{ 267 268 panic("%s(): not implemented\n", __func__); 269} 270