sys/arch/arm/ep93xx/ep93xx_space.c

   1 /*      $NetBSD: ep93xx_space.c,v 1.3 2005/11/24 13:08:32 yamt Exp $ */
   2
   3 /*
   4  * Copyright (c) 2004 Jesse Off
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY ICHIRO FUKUHARA ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL ICHIRO FUKUHARA OR THE VOICES IN HIS HEAD BE LIABLE FOR
  20  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __KERNEL_RCSID(0, "$NetBSD: ep93xx_space.c,v 1.3 2005/11/24 13:08:32 yamt Exp $");
  31
  32 /*
  33  * bus_space I/O functions for ep93xx
  34  */
  35
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/queue.h>
  39
  40 #include <uvm/uvm.h>
  41
  42 #include <machine/bus.h>
  43
  44 #include <arm/ep93xx/ep93xxreg.h>
  45 #include <arm/ep93xx/ep93xxvar.h>
  46
  47 /* Proto types for all the bus_space structure functions */
  48 bs_protos(ep93xx);
  49 bs_protos(generic);
  50 bs_protos(generic_armv4);
  51 bs_protos(bs_notimpl);
  52
  53 struct bus_space ep93xx_bs_tag = {
  54         /* cookie */
  55         (void *) 0,
  56
  57         /* mapping/unmapping */
  58         ep93xx_bs_map,
  59         ep93xx_bs_unmap,
  60         ep93xx_bs_subregion,
  61
  62         /* allocation/deallocation */
  63         ep93xx_bs_alloc,
  64         ep93xx_bs_free,
  65
  66         /* get kernel virtual address */
  67         ep93xx_bs_vaddr,
  68
  69         /* mmap bus space for userland */
  70         ep93xx_bs_mmap,
  71
  72         /* barrier */
  73         ep93xx_bs_barrier,
  74
  75         /* read (single) */
  76         generic_bs_r_1,
  77         generic_armv4_bs_r_2,
  78         generic_bs_r_4,
  79         bs_notimpl_bs_r_8,
  80
  81         /* read multiple */
  82         generic_bs_rm_1,
  83         generic_armv4_bs_rm_2,
  84         generic_bs_rm_4,
  85         bs_notimpl_bs_rm_8,
  86
  87         /* read region */
  88         generic_bs_rr_1,
  89         generic_armv4_bs_rr_2,
  90         generic_bs_rr_4,
  91         bs_notimpl_bs_rr_8,
  92
  93         /* write (single) */
  94         generic_bs_w_1,
  95         generic_armv4_bs_w_2,
  96         generic_bs_w_4,
  97         bs_notimpl_bs_w_8,
  98
  99         /* write multiple */
 100         generic_bs_wm_1,
 101         generic_armv4_bs_wm_2,
 102         generic_bs_wm_4,
 103         bs_notimpl_bs_wm_8,
 104
 105         /* write region */
 106         generic_bs_wr_1,
 107         generic_armv4_bs_wr_2,
 108         generic_bs_wr_4,
 109         bs_notimpl_bs_wr_8,
 110
 111         /* set multiple */
 112         bs_notimpl_bs_sm_1,
 113         bs_notimpl_bs_sm_2,
 114         bs_notimpl_bs_sm_4,
 115         bs_notimpl_bs_sm_8,
 116
 117         /* set region */
 118         bs_notimpl_bs_sr_1,
 119         generic_armv4_bs_sr_2,
 120         generic_bs_sr_4,
 121         bs_notimpl_bs_sr_8,
 122
 123         /* copy */
 124         bs_notimpl_bs_c_1,
 125         generic_armv4_bs_c_2,
 126         bs_notimpl_bs_c_4,
 127         bs_notimpl_bs_c_8,
 128 };
 129
 130 int
 131 ep93xx_bs_map(void *t, bus_addr_t bpa, bus_size_t size,
 132               int cacheable, bus_space_handle_t *bshp)
 133 {
 134         const struct pmap_devmap        *pd;
 135
 136         paddr_t         startpa;
 137         paddr_t         endpa;
 138         paddr_t         pa;
 139         paddr_t         offset;
 140         vaddr_t         va;
 141
 142         if ((pd = pmap_devmap_find_pa(bpa, size)) != NULL) {
 143                 /* Device was statically mapped. */
 144                 *bshp = pd->pd_va + (bpa - pd->pd_pa);
 145                 return 0;
 146         }
 147
 148         endpa = round_page(bpa + size);
 149         offset = bpa & PAGE_MASK;
 150         startpa = trunc_page(bpa);
 151
 152         /* Get some VM.  */
 153         va = uvm_km_alloc(kernel_map, endpa - startpa, 0,
 154             UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
 155         if (va == 0)
 156                 return ENOMEM;
 157
 158         /* Store the bus space handle */
 159         *bshp = va + offset;
 160
 161         /* Now map the pages */
 162         for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
 163                 pmap_enter(pmap_kernel(), va, pa,
 164                     VM_PROT_READ | VM_PROT_WRITE,
 165                     VM_PROT_READ | VM_PROT_WRITE | PMAP_WIRED);
 166         }
 167         pmap_update(pmap_kernel());
 168
 169         return(0);
 170 }
 171
 172 void
 173 ep93xx_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
 174 {
 175         vaddr_t va;
 176         vaddr_t endva;
 177
 178         if (pmap_devmap_find_va(bsh, size) != NULL) {
 179                 /* Device was statically mapped; nothing to do. */
 180                 return;
 181         }
 182
 183         endva = round_page(bsh + size);
 184         va = trunc_page(bsh);
 185
 186         pmap_remove(pmap_kernel(), va, endva);
 187         pmap_update(pmap_kernel());
 188         uvm_km_free(kernel_map, va, endva - va, UVM_KMF_VAONLY);
 189 }
 190
 191 int
 192 ep93xx_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend,
 193         bus_size_t size, bus_size_t alignment, bus_size_t boundary, int cacheable,
 194         bus_addr_t *bpap, bus_space_handle_t *bshp)
 195 {
 196         panic("ep93xx_bs_alloc(): not implemented\n");
 197 }
 198
 199 void
 200 ep93xx_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
 201 {
 202         panic("ep93xx_bs_free(): not implemented\n");
 203 }
 204
 205 int
 206 ep93xx_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
 207         bus_size_t size, bus_space_handle_t *nbshp)
 208 {
 209         *nbshp = bsh + offset;
 210         return (0);
 211 }
 212
 213 void *
 214 ep93xx_bs_vaddr(void *t, bus_space_handle_t bsh)
 215 {
 216         return ((void *)bsh);
 217 }
 218
 219 paddr_t
 220 ep93xx_bs_mmap(void *t, bus_addr_t addr, off_t off, int prot, int flags)
 221 {
 222         /* Not supported. */
 223         return (-1);
 224 }
 225
 226 void
 227 ep93xx_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset,
 228     bus_size_t len, int flags)
 229 {
 230 /* NULL */
 231 }
 232 /* End of ep93xx_space.c */