sys/arch/arm/imx/imx31_space.c

   1 /* $Id: imx31_space.c,v 1.3 2009/11/07 07:27:41 cegger Exp $ */
   2
   3 /* derived from: */
   4 /*      $NetBSD: imx31_space.c,v 1.2 2008/04/27 18:58:44 matt Exp $ */
   5
   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 /*
  41  * Copyright (c) 1997 Mark Brinicombe.
  42  * Copyright (c) 1997 Causality Limited.
  43  * All rights reserved.
  44  *
  45  * This code is derived from software contributed to The NetBSD Foundation
  46  * by Ichiro FUKUHARA.
  47  *
  48  * Redistribution and use in source and binary forms, with or without
  49  * modification, are permitted provided that the following conditions
  50  * are met:
  51  * 1. Redistributions of source code must retain the above copyright
  52  *    notice, this list of conditions and the following disclaimer.
  53  * 2. Redistributions in binary form must reproduce the above copyright
  54  *    notice, this list of conditions and the following disclaimer in the
  55  *    documentation and/or other materials provided with the distribution.
  56  * 3. All advertising materials mentioning features or use of this software
  57  *    must display the following acknowledgement:
  58  *      This product includes software developed by Mark Brinicombe.
  59  * 4. The name of the company nor the name of the author may be used to
  60  *    endorse or promote products derived from this software without specific
  61  *    prior written permission.
  62  *
  63  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  64  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  65  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  66  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  67  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  68  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  69  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  70  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  71  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  72  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  73  * SUCH DAMAGE.
  74  */
  75
  76 /*
  77  * bus_space(9) support for Freescale iMX31 processor
  78  */
  79
  80 #include <sys/param.h>
  81 #include <sys/systm.h>
  82 #include <uvm/uvm_extern.h>
  83 #include <machine/bus.h>
  84
  85 bs_protos(imx31);
  86 bs_protos(generic);
  87 bs_protos(generic_armv4);
  88 bs_protos(bs_notimpl);
  89
  90 struct bus_space imx31_bs_tag = {
  91         /* cookie */
  92         (void *) 0,
  93
  94         /* mapping/unmapping */
  95         imx31_bs_map,
  96         imx31_bs_unmap,
  97         imx31_bs_subregion,
  98
  99         /* allocation/deallocation */
 100         imx31_bs_alloc, /* not implemented */
 101         imx31_bs_free,          /* not implemented */
 102
 103         /* get kernel virtual address */
 104         imx31_bs_vaddr,
 105
 106         /* mmap */
 107         bs_notimpl_bs_mmap,
 108
 109         /* barrier */
 110         imx31_bs_barrier,
 111
 112         /* read (single) */
 113         generic_bs_r_1,
 114         generic_armv4_bs_r_2,
 115         generic_bs_r_4,
 116         bs_notimpl_bs_r_8,
 117
 118         /* read multiple */
 119         generic_bs_rm_1,
 120         generic_armv4_bs_rm_2,
 121         generic_bs_rm_4,
 122         bs_notimpl_bs_rm_8,
 123
 124         /* read region */
 125         generic_bs_rr_1,
 126         generic_armv4_bs_rr_2,
 127         generic_bs_rr_4,
 128         bs_notimpl_bs_rr_8,
 129
 130         /* write (single) */
 131         generic_bs_w_1,
 132         generic_armv4_bs_w_2,
 133         generic_bs_w_4,
 134         bs_notimpl_bs_w_8,
 135
 136         /* write multiple */
 137         generic_bs_wm_1,
 138         generic_armv4_bs_wm_2,
 139         generic_bs_wm_4,
 140         bs_notimpl_bs_wm_8,
 141
 142         /* write region */
 143         generic_bs_wr_1,
 144         generic_armv4_bs_wr_2,
 145         generic_bs_wr_4,
 146         bs_notimpl_bs_wr_8,
 147
 148         /* set multiple */
 149         bs_notimpl_bs_sm_1,
 150         bs_notimpl_bs_sm_2,
 151         bs_notimpl_bs_sm_4,
 152         bs_notimpl_bs_sm_8,
 153
 154         /* set region */
 155         generic_bs_sr_1,
 156         generic_armv4_bs_sr_2,
 157         bs_notimpl_bs_sr_4,
 158         bs_notimpl_bs_sr_8,
 159
 160         /* copy */
 161         bs_notimpl_bs_c_1,
 162         generic_armv4_bs_c_2,
 163         bs_notimpl_bs_c_4,
 164         bs_notimpl_bs_c_8,
 165 };
 166
 167 int
 168 imx31_bs_map(void *t, bus_addr_t bpa, bus_size_t size,
 169               int flag, bus_space_handle_t *bshp)
 170 {
 171         u_long startpa, endpa, pa;
 172         vaddr_t va;
 173         pt_entry_t *pte;
 174         const struct pmap_devmap        *pd;
 175
 176         if ((pd = pmap_devmap_find_pa(bpa, size)) != NULL) {
 177                 /* Device was statically mapped. */
 178                 *bshp = pd->pd_va + (bpa - pd->pd_pa);
 179                 return 0;
 180         }
 181
 182         startpa = trunc_page(bpa);
 183         endpa = round_page(bpa + size);
 184
 185         /* XXX use extent manager to check duplicate mapping */
 186
 187         va = uvm_km_alloc(kernel_map, endpa - startpa, 0,
 188             UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
 189         if (! va)
 190                 return(ENOMEM);
 191
 192         *bshp = (bus_space_handle_t)(va + (bpa - startpa));
 193
 194         for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
 195                 pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE, 0);
 196                 if ((flag & BUS_SPACE_MAP_CACHEABLE) == 0) {
 197                         pte = vtopte(va);
 198                         *pte &= ~L2_S_CACHE_MASK;
 199                         PTE_SYNC(pte);
 200                         /* XXX: pmap_kenter_pa() also does PTE_SYNC(). a bit of
 201                          *      waste.
 202                          */
 203                 }
 204         }
 205         pmap_update(pmap_kernel());
 206
 207         return(0);
 208 }
 209
 210 void
 211 imx31_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
 212 {
 213         vaddr_t va;
 214         vsize_t sz;
 215
 216         if (pmap_devmap_find_va(bsh, size) != NULL) {
 217                 /* Device was statically mapped; nothing to do. */
 218                 return;
 219         }
 220
 221         va = trunc_page(bsh);
 222         sz = round_page(bsh + size) - va;
 223
 224         pmap_kremove(va, sz);
 225         pmap_update(pmap_kernel());
 226         uvm_km_free(kernel_map, va, sz, UVM_KMF_VAONLY);
 227 }
 228
 229
 230 int
 231 imx31_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
 232     bus_size_t size, bus_space_handle_t *nbshp)
 233 {
 234
 235         *nbshp = bsh + offset;
 236         return (0);
 237 }
 238
 239 void
 240 imx31_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset,
 241     bus_size_t len, int flags)
 242 {
 243
 244         /* Nothing to do. */
 245 }
 246
 247 void *
 248 imx31_bs_vaddr(void *t, bus_space_handle_t bsh)
 249 {
 250
 251         return ((void *)bsh);
 252 }
 253
 254
 255 int
 256 imx31_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("imx31_io_bs_alloc(): not implemented\n");
 262 }
 263
 264 void
 265 imx31_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
 266 {
 267
 268         panic("imx31_io_bs_free(): not implemented\n");
 269 }
 270
 271