sys/arch/arm/mainbus/mainbus_io.c

   1 /*      $NetBSD: mainbus_io.c,v 1.19 2009/03/15 22:25:46 cegger Exp $   */
   2
   3 /*
   4  * Copyright (c) 1997 Mark Brinicombe.
   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  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Mark Brinicombe.
  18  * 4. The name of the company nor the name of the author may be used to
  19  *    endorse or promote products derived from this software without specific
  20  *    prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  23  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  25  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  26  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  27  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  28  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 /*
  36  * bus_space I/O functions for mainbus
  37  */
  38
  39 #include <sys/cdefs.h>
  40 __KERNEL_RCSID(0, "$NetBSD: mainbus_io.c,v 1.19 2009/03/15 22:25:46 cegger Exp $");
  41
  42 #include <sys/param.h>
  43 #include <sys/systm.h>
  44 #include <sys/queue.h>
  45
  46 #include <uvm/uvm.h>
  47
  48 #include <machine/bus.h>
  49 #include <machine/pmap.h>
  50
  51 /* Proto types for all the bus_space structure functions */
  52
  53 bs_protos(mainbus);
  54 bs_protos(bs_notimpl);
  55
  56 /* Declare the mainbus bus space tag */
  57
  58 struct bus_space mainbus_bs_tag = {
  59         /* cookie */
  60         NULL,
  61
  62         /* mapping/unmapping */
  63         mainbus_bs_map,
  64         mainbus_bs_unmap,
  65         mainbus_bs_subregion,
  66
  67         /* allocation/deallocation */
  68         mainbus_bs_alloc,
  69         mainbus_bs_free,
  70
  71         /* get kernel virtual address */
  72         0, /* there is no linear mapping */
  73
  74         /* Mmap bus space for user */
  75         mainbus_bs_mmap,
  76
  77         /* barrier */
  78         mainbus_bs_barrier,
  79
  80         /* read (single) */
  81         mainbus_bs_r_1,
  82         mainbus_bs_r_2,
  83         mainbus_bs_r_4,
  84         bs_notimpl_bs_r_8,
  85
  86         /* read multiple */
  87         bs_notimpl_bs_rm_1,
  88         mainbus_bs_rm_2,
  89         bs_notimpl_bs_rm_4,
  90         bs_notimpl_bs_rm_8,
  91
  92         /* read region */
  93         bs_notimpl_bs_rr_1,
  94         bs_notimpl_bs_rr_2,
  95         bs_notimpl_bs_rr_4,
  96         bs_notimpl_bs_rr_8,
  97
  98         /* write (single) */
  99         mainbus_bs_w_1,
 100         mainbus_bs_w_2,
 101         mainbus_bs_w_4,
 102         bs_notimpl_bs_w_8,
 103
 104         /* write multiple */
 105         mainbus_bs_wm_1,
 106         mainbus_bs_wm_2,
 107         bs_notimpl_bs_wm_4,
 108         bs_notimpl_bs_wm_8,
 109
 110         /* write region */
 111         bs_notimpl_bs_wr_1,
 112         bs_notimpl_bs_wr_2,
 113         bs_notimpl_bs_wr_4,
 114         bs_notimpl_bs_wr_8,
 115
 116         bs_notimpl_bs_sm_1,
 117         bs_notimpl_bs_sm_2,
 118         bs_notimpl_bs_sm_4,
 119         bs_notimpl_bs_sm_8,
 120
 121         /* set region */
 122         bs_notimpl_bs_sr_1,
 123         bs_notimpl_bs_sr_2,
 124         bs_notimpl_bs_sr_4,
 125         bs_notimpl_bs_sr_8,
 126
 127         /* copy */
 128         bs_notimpl_bs_c_1,
 129         bs_notimpl_bs_c_2,
 130         bs_notimpl_bs_c_4,
 131         bs_notimpl_bs_c_8,
 132 };
 133
 134 /* bus space functions */
 135
 136 int
 137 mainbus_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int flags, bus_space_handle_t *bshp)
 138 {
 139         u_long startpa, endpa, pa;
 140         vaddr_t va;
 141         pt_entry_t *pte;
 142
 143         if ((u_long)bpa > (u_long)KERNEL_BASE) {
 144                 /* XXX This is a temporary hack to aid transition. */
 145                 *bshp = bpa;
 146                 return(0);
 147         }
 148
 149         startpa = trunc_page(bpa);
 150         endpa = round_page(bpa + size);
 151
 152         /* XXX use extent manager to check duplicate mapping */
 153
 154         va = uvm_km_alloc(kernel_map, endpa - startpa, 0,
 155             UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
 156         if (! va)
 157                 return(ENOMEM);
 158
 159         *bshp = (bus_space_handle_t)(va + (bpa - startpa));
 160
 161         for(pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
 162                 pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE, 0);
 163                 if ((flags & BUS_SPACE_MAP_CACHEABLE) == 0) {
 164                         pte = vtopte(va);
 165                         *pte &= ~L2_S_CACHE_MASK;
 166                         PTE_SYNC(pte);
 167                 }
 168         }
 169         pmap_update(pmap_kernel());
 170
 171         return(0);
 172 }
 173
 174 int
 175 mainbus_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend,
 176     bus_size_t size, bus_size_t alignment, bus_size_t boundary,
 177     int cacheable,
 178     bus_addr_t *bpap, bus_space_handle_t *bshp)
 179 {
 180         panic("mainbus_bs_alloc(): Help!");
 181 }
 182
 183
 184 void
 185 mainbus_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
 186 {
 187         /*
 188          * Temporary implementation
 189          */
 190 }
 191
 192 void
 193 mainbus_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
 194 {
 195
 196         panic("mainbus_bs_free(): Help!");
 197         /* mainbus_bs_unmap() does all that we need to do. */
 198 /*      mainbus_bs_unmap(t, bsh, size);*/
 199 }
 200
 201 int
 202 mainbus_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp)
 203 {
 204
 205         *nbshp = bsh + (offset << 2);
 206         return (0);
 207 }
 208
 209 paddr_t
 210 mainbus_bs_mmap(void *t, bus_addr_t paddr, off_t offset, int prot, int flags)
 211 {
 212         /*
 213          * mmap from address `paddr+offset' for one page
 214          */
 215          return (arm_btop((paddr + offset)));
 216 }
 217
 218 void
 219 mainbus_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset, bus_size_t len, int flags)
 220 {
 221 }
 222
 223 /* End of mainbus_io.c */