sys/arch/arm/omap/omap_space.c

   1 /*      $NetBSD: omap_space.c,v 1.2 2007/12/15 00:39:14 perry Exp $ */
   2
   3 /*
   4  * bus_space functions for Texas Instruments OMAP processor.
   5  * Based on pxa2x0_space.c which in turn was derived from i80321_space.c.
   6  *
   7  * Copyright (c) 2001, 2002 Wasabi Systems, Inc.
   8  * All rights reserved.
   9  *
  10  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *      This product includes software developed for the NetBSD Project by
  23  *      Wasabi Systems, Inc.
  24  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
  25  *    or promote products derived from this software without specific prior
  26  *    written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  30  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  31  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
  32  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  33  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  34  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  35  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  36  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  37  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  38  * POSSIBILITY OF SUCH DAMAGE.
  39  *
  40  * Copyright (c) 1997 Mark Brinicombe.
  41  * Copyright (c) 1997 Causality Limited.
  42  * All rights reserved.
  43  *
  44  * This code is derived from software contributed to The NetBSD Foundation
  45  * by Ichiro FUKUHARA.
  46  *
  47  * Redistribution and use in source and binary forms, with or without
  48  * modification, are permitted provided that the following conditions
  49  * are met:
  50  * 1. Redistributions of source code must retain the above copyright
  51  *    notice, this list of conditions and the following disclaimer.
  52  * 2. Redistributions in binary form must reproduce the above copyright
  53  *    notice, this list of conditions and the following disclaimer in the
  54  *    documentation and/or other materials provided with the distribution.
  55  * 3. All advertising materials mentioning features or use of this software
  56  *    must display the following acknowledgement:
  57  *      This product includes software developed by Mark Brinicombe.
  58  * 4. The name of the company nor the name of the author may be used to
  59  *    endorse or promote products derived from this software without specific
  60  *    prior written permission.
  61  *
  62  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  63  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  64  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  65  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  66  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  67  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  68  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  69  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  70  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  71  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  72  * SUCH DAMAGE.
  73  */
  74
  75 #include <sys/cdefs.h>
  76 __KERNEL_RCSID(0, "$NetBSD: omap_space.c,v 1.2 2007/12/15 00:39:14 perry Exp $");
  77
  78 #include <sys/param.h>
  79 #include <sys/systm.h>
  80
  81 #include <uvm/uvm_extern.h>
  82
  83 #include <machine/bus.h>
  84
  85 /* Prototypes for all the bus_space structure functions */
  86 bs_protos(omap);
  87 bs_protos(generic);
  88 bs_protos(generic_armv4);
  89 bs_protos(bs_notimpl);
  90
  91 struct bus_space omap_bs_tag = {
  92         /* cookie */
  93         (void *) 0,
  94
  95         /* mapping/unmapping */
  96         omap_bs_map,
  97         omap_bs_unmap,
  98         omap_bs_subregion,
  99
 100         /* allocation/deallocation */
 101         omap_bs_alloc,  /* not implemented */
 102         omap_bs_free,           /* not implemented */
 103
 104         /* get kernel virtual address */
 105         omap_bs_vaddr,
 106
 107         /* mmap */
 108         bs_notimpl_bs_mmap,
 109
 110         /* barrier */
 111         omap_bs_barrier,
 112
 113         /* read (single) */
 114         generic_bs_r_1,
 115         generic_armv4_bs_r_2,
 116         generic_bs_r_4,
 117         bs_notimpl_bs_r_8,
 118
 119         /* read multiple */
 120         generic_bs_rm_1,
 121         generic_armv4_bs_rm_2,
 122         generic_bs_rm_4,
 123         bs_notimpl_bs_rm_8,
 124
 125         /* read region */
 126         generic_bs_rr_1,
 127         generic_armv4_bs_rr_2,
 128         generic_bs_rr_4,
 129         bs_notimpl_bs_rr_8,
 130
 131         /* write (single) */
 132         generic_bs_w_1,
 133         generic_armv4_bs_w_2,
 134         generic_bs_w_4,
 135         bs_notimpl_bs_w_8,
 136
 137         /* write multiple */
 138         generic_bs_wm_1,
 139         generic_armv4_bs_wm_2,
 140         generic_bs_wm_4,
 141         bs_notimpl_bs_wm_8,
 142
 143         /* write region */
 144         generic_bs_wr_1,
 145         generic_armv4_bs_wr_2,
 146         generic_bs_wr_4,
 147         bs_notimpl_bs_wr_8,
 148
 149         /* set multiple */
 150         bs_notimpl_bs_sm_1,
 151         bs_notimpl_bs_sm_2,
 152         bs_notimpl_bs_sm_4,
 153         bs_notimpl_bs_sm_8,
 154
 155         /* set region */
 156         generic_bs_sr_1,
 157         generic_armv4_bs_sr_2,
 158         bs_notimpl_bs_sr_4,
 159         bs_notimpl_bs_sr_8,
 160
 161         /* copy */
 162         bs_notimpl_bs_c_1,
 163         generic_armv4_bs_c_2,
 164         bs_notimpl_bs_c_4,
 165         bs_notimpl_bs_c_8,
 166 };
 167
 168 int
 169 omap_bs_map(void *t, bus_addr_t bpa, bus_size_t size,
 170               int flag, bus_space_handle_t *bshp)
 171 {
 172         u_long startpa, endpa, pa;
 173         vaddr_t va;
 174         pt_entry_t *pte;
 175         const struct pmap_devmap        *pd;
 176
 177         if ((pd = pmap_devmap_find_pa(bpa, size)) != NULL) {
 178                 /* Device was statically mapped. */
 179                 *bshp = pd->pd_va + (bpa - pd->pd_pa);
 180                 return 0;
 181         }
 182
 183         startpa = trunc_page(bpa);
 184         endpa = round_page(bpa + size);
 185
 186         /* XXX use extent manager to check duplicate mapping */
 187
 188         va = uvm_km_alloc(kernel_map, endpa - startpa, 0,
 189             UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
 190         if (! va)
 191                 return(ENOMEM);
 192
 193         *bshp = (bus_space_handle_t)(va + (bpa - startpa));
 194
 195         for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
 196                 pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE, 0);
 197                 if ((flag & BUS_SPACE_MAP_CACHEABLE) == 0) {
 198                         pte = vtopte(va);
 199                         *pte &= ~L2_S_CACHE_MASK;
 200                         PTE_SYNC(pte);
 201                         /* XXX: pmap_kenter_pa() also does PTE_SYNC(). a bit of
 202                          *      waste.
 203                          */
 204                 }
 205         }
 206         pmap_update(pmap_kernel());
 207
 208         return(0);
 209 }
 210
 211 void
 212 omap_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
 213 {
 214         vaddr_t va;
 215         vsize_t sz;
 216
 217         if (pmap_devmap_find_va(bsh, size) != NULL) {
 218                 /* Device was statically mapped; nothing to do. */
 219                 return;
 220         }
 221
 222         va = trunc_page(bsh);
 223         sz = round_page(bsh + size) - va;
 224
 225         pmap_kremove(va, sz);
 226         pmap_update(pmap_kernel());
 227         uvm_km_free(kernel_map, va, sz, UVM_KMF_VAONLY);
 228 }
 229
 230
 231 int
 232 omap_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
 233     bus_size_t size, bus_space_handle_t *nbshp)
 234 {
 235
 236         *nbshp = bsh + offset;
 237         return (0);
 238 }
 239
 240 void
 241 omap_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset,
 242     bus_size_t len, int flags)
 243 {
 244
 245         /* Nothing to do. */
 246 }
 247
 248 void *
 249 omap_bs_vaddr(void *t, bus_space_handle_t bsh)
 250 {
 251
 252         return ((void *)bsh);
 253 }
 254
 255
 256 int
 257 omap_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend,
 258     bus_size_t size, bus_size_t alignment, bus_size_t boundary, int flags,
 259     bus_addr_t *bpap, bus_space_handle_t *bshp)
 260 {
 261
 262         panic("%s(): not implemented\n", __func__);
 263 }
 264
 265 void
 266 omap_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
 267 {
 268
 269         panic("%s(): not implemented\n", __func__);
 270 }
 271