sys/arch/arm/sa11x0/sa11x0_io.c

   1 /*      $NetBSD: sa11x0_io.c,v 1.17 2006/06/27 13:58:08 peter Exp $     */
   2
   3 /*
   4  * Copyright (c) 1997 Mark Brinicombe.
   5  * Copyright (c) 1997 Causality Limited.
   6  * All rights reserved.
   7  *
   8  * This code is derived from software contributed to The NetBSD Foundation
   9  * by Ichiro FUKUHARA.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by Mark Brinicombe.
  22  * 4. The name of the company nor the name of the author may be used to
  23  *    endorse or promote products derived from this software without specific
  24  *    prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  27  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  28  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  29  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  30  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  31  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  32  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 /*
  40  * bus_space I/O functions for sa11x0
  41  */
  42
  43 #include <sys/cdefs.h>
  44 __KERNEL_RCSID(0, "$NetBSD: sa11x0_io.c,v 1.17 2006/06/27 13:58:08 peter Exp $");
  45
  46 #include <sys/param.h>
  47 #include <sys/systm.h>
  48 #include <sys/queue.h>
  49
  50 #include <uvm/uvm.h>
  51
  52 #include <machine/bus.h>
  53 #include <machine/pmap.h>
  54
  55 /* Prototypes for all the bus_space structure functions */
  56
  57 bs_protos(sa11x0);
  58 bs_protos(bs_notimpl);
  59
  60 /* Declare the sa11x0 bus space tag */
  61
  62 struct bus_space sa11x0_bs_tag = {
  63         /* cookie */
  64         NULL,
  65
  66         /* mapping/unmapping */
  67         sa11x0_bs_map,
  68         sa11x0_bs_unmap,
  69         sa11x0_bs_subregion,
  70
  71         /* allocation/deallocation */
  72         sa11x0_bs_alloc,
  73         sa11x0_bs_free,
  74
  75         /* get kernel virtual address */
  76         sa11x0_bs_vaddr,
  77
  78         /* mmap bus space for userland */
  79         sa11x0_bs_mmap,
  80
  81         /* barrier */
  82         sa11x0_bs_barrier,
  83
  84         /* read (single) */
  85         sa11x0_bs_r_1,
  86         sa11x0_bs_r_2,
  87         sa11x0_bs_r_4,
  88         bs_notimpl_bs_r_8,
  89
  90         /* read multiple */
  91         sa11x0_bs_rm_1,
  92         sa11x0_bs_rm_2,
  93         sa11x0_bs_rm_4,
  94         bs_notimpl_bs_rm_8,
  95
  96         /* read region */
  97         bs_notimpl_bs_rr_1,
  98         sa11x0_bs_rr_2,
  99         bs_notimpl_bs_rr_4,
 100         bs_notimpl_bs_rr_8,
 101
 102         /* write (single) */
 103         sa11x0_bs_w_1,
 104         sa11x0_bs_w_2,
 105         sa11x0_bs_w_4,
 106         bs_notimpl_bs_w_8,
 107
 108         /* write multiple */
 109         sa11x0_bs_wm_1,
 110         sa11x0_bs_wm_2,
 111         sa11x0_bs_wm_4,
 112         bs_notimpl_bs_wm_8,
 113
 114         /* write region */
 115         bs_notimpl_bs_wr_1,
 116         sa11x0_bs_wr_2,
 117         bs_notimpl_bs_wr_4,
 118         bs_notimpl_bs_wr_8,
 119
 120         /* set multiple */
 121         bs_notimpl_bs_sm_1,
 122         bs_notimpl_bs_sm_2,
 123         bs_notimpl_bs_sm_4,
 124         bs_notimpl_bs_sm_8,
 125
 126         /* set region */
 127         bs_notimpl_bs_sr_1,
 128         sa11x0_bs_sr_2,
 129         bs_notimpl_bs_sr_4,
 130         bs_notimpl_bs_sr_8,
 131
 132         /* copy */
 133         bs_notimpl_bs_c_1,
 134         sa11x0_bs_c_2,
 135         bs_notimpl_bs_c_4,
 136         bs_notimpl_bs_c_8,
 137 };
 138
 139 /* bus space functions */
 140
 141 int
 142 sa11x0_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int cacheable,
 143     bus_space_handle_t *bshp)
 144 {
 145         u_long startpa, endpa, pa;
 146         vaddr_t va;
 147         pt_entry_t *pte;
 148         const struct pmap_devmap *pd;
 149
 150         if ((pd = pmap_devmap_find_pa(bpa, size)) != NULL) {
 151                 /* Device was statically mapped. */
 152                 *bshp = pd->pd_va + (bpa - pd->pd_pa);
 153                 return 0;
 154         }
 155
 156         startpa = trunc_page(bpa);
 157         endpa = round_page(bpa + size);
 158
 159         /* XXX use extent manager to check duplicate mapping */
 160
 161         va = uvm_km_alloc(kernel_map, endpa - startpa, 0,
 162             UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
 163         if (!va)
 164                 return ENOMEM;
 165
 166         *bshp = (bus_space_handle_t)(va + (bpa - startpa));
 167
 168         for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
 169                 pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE, 0);
 170                 pte = vtopte(va);
 171                 if (cacheable == 0) {
 172                         *pte &= ~L2_S_CACHE_MASK;
 173                         PTE_SYNC(pte);
 174                 }
 175         }
 176         pmap_update(pmap_kernel());
 177
 178         return 0;
 179 }
 180
 181 int
 182 sa11x0_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend, bus_size_t size,
 183     bus_size_t alignment, bus_size_t boundary, int cacheable,
 184     bus_addr_t *bpap, bus_space_handle_t *bshp)
 185 {
 186
 187         panic("sa11x0_bs_alloc(): Help!");
 188 }
 189
 190 void
 191 sa11x0_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
 192 {
 193         vaddr_t va, endva;
 194
 195         if (pmap_devmap_find_va(bsh, size) != NULL) {
 196                 /* Device was statically mapped; nothing to do. */
 197                 return;
 198         }
 199
 200         va = trunc_page(bsh);
 201         endva = round_page(bsh + size);
 202
 203         pmap_kremove(va, endva - va);
 204         pmap_update(pmap_kernel());
 205
 206         uvm_km_free(kernel_map, va, endva - va, UVM_KMF_VAONLY);
 207 }
 208
 209 void
 210 sa11x0_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
 211 {
 212
 213         panic("sa11x0_bs_free(): Help!");
 214 }
 215
 216 int
 217 sa11x0_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
 218     bus_size_t size, bus_space_handle_t *nbshp)
 219 {
 220
 221         *nbshp = bsh + offset;
 222         return 0;
 223 }
 224
 225 paddr_t
 226 sa11x0_bs_mmap(void *t, bus_addr_t paddr, off_t offset, int prot, int flags)
 227 {
 228         /*
 229          * mmap from address `paddr+offset' for one page
 230          */
 231          return arm_btop((paddr + offset));
 232 }
 233
 234 void *
 235 sa11x0_bs_vaddr(void *t, bus_space_handle_t bsh)
 236 {
 237         return (void *)bsh;
 238 }
 239
 240 void
 241 sa11x0_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset,
 242     bus_size_t len, int flags)
 243 {
 244
 245 }