sys/arch/evbarm/iq80310/obio_space.c

   1 /*      $NetBSD: obio_space.c,v 1.12 2005/11/24 13:08:33 yamt Exp $     */
   2
   3 /*
   4  * Copyright (c) 2001, 2002, 2003 Wasabi Systems, Inc.
   5  * All rights reserved.
   6  *
   7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed for the NetBSD Project by
  20  *      Wasabi Systems, Inc.
  21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
  22  *    or promote products derived from this software without specific prior
  23  *    written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
  29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 /*
  39  * bus_space functions for IQ80310 on-board devices
  40  */
  41
  42 #include <sys/cdefs.h>
  43 __KERNEL_RCSID(0, "$NetBSD: obio_space.c,v 1.12 2005/11/24 13:08:33 yamt Exp $");
  44
  45 #include <sys/param.h>
  46 #include <sys/systm.h>
  47
  48 #include <uvm/uvm_extern.h>
  49
  50 #include <machine/bus.h>
  51
  52 /* Prototypes for all the bus_space structure functions */
  53 bs_protos(obio);
  54 bs_protos(generic);
  55 bs_protos(bs_notimpl);
  56
  57 /*
  58  * The obio bus space tag.  This is constant for all instances, so
  59  * we never have to explicitly "create" it.
  60  */
  61 struct bus_space obio_bs_tag = {
  62         /* cookie */
  63         (void *) 0,
  64
  65         /* mapping/unmapping */
  66         obio_bs_map,
  67         obio_bs_unmap,
  68         obio_bs_subregion,
  69
  70         /* allocation/deallocation */
  71         obio_bs_alloc,
  72         obio_bs_free,
  73
  74         /* get kernel virtual address */
  75         obio_bs_vaddr,
  76
  77         /* mmap */
  78         bs_notimpl_bs_mmap,
  79
  80         /* barrier */
  81         obio_bs_barrier,
  82
  83         /* read (single) */
  84         generic_bs_r_1,
  85         bs_notimpl_bs_r_2,
  86         generic_bs_r_4,
  87         bs_notimpl_bs_r_8,
  88
  89         /* read multiple */
  90         generic_bs_rm_1,
  91         bs_notimpl_bs_rm_2,
  92         bs_notimpl_bs_rm_4,
  93         bs_notimpl_bs_rm_8,
  94
  95         /* read region */
  96         generic_bs_rr_1,
  97         bs_notimpl_bs_rr_2,
  98         bs_notimpl_bs_rr_4,
  99         bs_notimpl_bs_rr_8,
 100
 101         /* write (single) */
 102         generic_bs_w_1,
 103         bs_notimpl_bs_w_2,
 104         generic_bs_w_4,
 105         bs_notimpl_bs_w_8,
 106
 107         /* write multiple */
 108         generic_bs_wm_1,
 109         bs_notimpl_bs_wm_2,
 110         bs_notimpl_bs_wm_4,
 111         bs_notimpl_bs_wm_8,
 112
 113         /* write region */
 114         bs_notimpl_bs_wr_1,
 115         bs_notimpl_bs_wr_2,
 116         bs_notimpl_bs_wr_4,
 117         bs_notimpl_bs_wr_8,
 118
 119         /* set multiple */
 120         bs_notimpl_bs_sm_1,
 121         bs_notimpl_bs_sm_2,
 122         bs_notimpl_bs_sm_4,
 123         bs_notimpl_bs_sm_8,
 124
 125         /* set region */
 126         bs_notimpl_bs_sr_1,
 127         bs_notimpl_bs_sr_2,
 128         bs_notimpl_bs_sr_4,
 129         bs_notimpl_bs_sr_8,
 130
 131         /* copy */
 132         bs_notimpl_bs_c_1,
 133         bs_notimpl_bs_c_2,
 134         bs_notimpl_bs_c_4,
 135         bs_notimpl_bs_c_8,
 136 };
 137
 138 int
 139 obio_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int flags,
 140     bus_space_handle_t *bshp)
 141 {
 142         const struct pmap_devmap *pd;
 143         paddr_t startpa, endpa, pa, offset;
 144         vaddr_t va;
 145         pt_entry_t *pte;
 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         va = uvm_km_alloc(kernel_map, endpa - startpa, 0,
 158             UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
 159         if (va == 0)
 160                 return(ENOMEM);
 161
 162         *bshp = va + offset;
 163
 164         for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
 165                 pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE, 0);
 166                 pte = vtopte(va);
 167                 *pte &= ~L2_S_CACHE_MASK;
 168                 PTE_SYNC(pte);
 169         }
 170         pmap_update(pmap_kernel());
 171
 172         return (0);
 173 }
 174
 175 int
 176 obio_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend, bus_size_t size,
 177     bus_size_t alignment, bus_size_t boundary, int flags, bus_addr_t *bpap,
 178     bus_space_handle_t *bshp)
 179 {
 180
 181         panic("obio_bs_alloc(): not implemented");
 182 }
 183
 184
 185 void
 186 obio_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
 187 {
 188         vaddr_t va, endva;
 189
 190         if (pmap_devmap_find_va(bsh, size) != NULL) {
 191                 /* Device was statically mapped; nothing to do. */
 192                 return;
 193         }
 194
 195         endva = round_page(bsh + size);
 196         va = trunc_page(bsh);
 197
 198         pmap_kremove(va, endva - va);
 199         uvm_km_free(kernel_map, va, endva - va, UVM_KMF_VAONLY);
 200 }
 201
 202 void
 203 obio_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
 204 {
 205
 206         panic("obio_bs_free(): not implemented");
 207 }
 208
 209 int
 210 obio_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
 211     bus_size_t size, bus_space_handle_t *nbshp)
 212 {
 213
 214         *nbshp = bsh + offset;
 215         return (0);
 216 }
 217
 218 void *
 219 obio_bs_vaddr(void *t, bus_space_handle_t bsh)
 220 {
 221
 222         return ((void *)bsh);
 223 }
 224
 225 void
 226 obio_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset,
 227     bus_size_t len, int flags)
 228 {
 229
 230         /* Nothing to do. */
 231 }