sys/arch/arm/at91/at91_bus_space.c

   1 /*      $NetBSD: at91_bus_space.c,v 1.2 2008/07/03 01:15:38 matt Exp $ */
   2
   3 /*
   4  * Based on ep93xx_space.c
   5  * Copyright (c) 2007 Embedtronics Oy
   6  * All rights reserved.
   7  *
   8  * Copyright (c) 2004 Jesse Off
   9  * All rights reserved.
  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  *
  20  * THIS SOFTWARE IS PROVIDED BY ICHIRO FUKUHARA ``AS IS'' AND ANY EXPRESS OR
  21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  23  * IN NO EVENT SHALL ICHIRO FUKUHARA OR THE VOICES IN HIS HEAD BE LIABLE FOR
  24  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __KERNEL_RCSID(0, "$NetBSD: at91_bus_space.c,v 1.2 2008/07/03 01:15:38 matt Exp $");
  35
  36 /*
  37  * bus_space I/O functions for ep93xx
  38  */
  39
  40 #include <sys/param.h>
  41 #include <sys/systm.h>
  42 #include <sys/queue.h>
  43
  44 #include <uvm/uvm.h>
  45
  46 #include <machine/bus.h>
  47
  48 #include <arm/at91/at91var.h>
  49 //#include <arm/ep93xx/ep93xxreg.h>
  50 //#include <arm/ep93xx/ep93xxvar.h>
  51
  52 /* Proto types for all the bus_space structure functions */
  53 bs_protos(at91);
  54 bs_protos(generic);
  55 bs_protos(generic_armv4);
  56 bs_protos(bs_notimpl);
  57
  58 struct bus_space at91_bs_tag = {
  59         /* cookie */
  60         (void *) 0,
  61
  62         /* mapping/unmapping */
  63         at91_bs_map,
  64         at91_bs_unmap,
  65         at91_bs_subregion,
  66
  67         /* allocation/deallocation */
  68         at91_bs_alloc,
  69         at91_bs_free,
  70
  71         /* get kernel virtual address */
  72         at91_bs_vaddr,
  73
  74         /* mmap bus space for userland */
  75         at91_bs_mmap,
  76
  77         /* barrier */
  78         at91_bs_barrier,
  79
  80         /* read (single) */
  81         generic_bs_r_1,
  82         generic_armv4_bs_r_2,
  83         generic_bs_r_4,
  84         bs_notimpl_bs_r_8,
  85
  86         /* read multiple */
  87         generic_bs_rm_1,
  88         generic_armv4_bs_rm_2,
  89         generic_bs_rm_4,
  90         bs_notimpl_bs_rm_8,
  91
  92         /* read region */
  93         generic_bs_rr_1,
  94         generic_armv4_bs_rr_2,
  95         generic_bs_rr_4,
  96         bs_notimpl_bs_rr_8,
  97
  98         /* write (single) */
  99         generic_bs_w_1,
 100         generic_armv4_bs_w_2,
 101         generic_bs_w_4,
 102         bs_notimpl_bs_w_8,
 103
 104         /* write multiple */
 105         generic_bs_wm_1,
 106         generic_armv4_bs_wm_2,
 107         generic_bs_wm_4,
 108         bs_notimpl_bs_wm_8,
 109
 110         /* write region */
 111         generic_bs_wr_1,
 112         generic_armv4_bs_wr_2,
 113         generic_bs_wr_4,
 114         bs_notimpl_bs_wr_8,
 115
 116         /* set multiple */
 117         bs_notimpl_bs_sm_1,
 118         bs_notimpl_bs_sm_2,
 119         bs_notimpl_bs_sm_4,
 120         bs_notimpl_bs_sm_8,
 121
 122         /* set region */
 123         bs_notimpl_bs_sr_1,
 124         generic_armv4_bs_sr_2,
 125         generic_bs_sr_4,
 126         bs_notimpl_bs_sr_8,
 127
 128         /* copy */
 129         bs_notimpl_bs_c_1,
 130         generic_armv4_bs_c_2,
 131         bs_notimpl_bs_c_4,
 132         bs_notimpl_bs_c_8,
 133 };
 134
 135 int
 136 at91_bs_map(void *t, bus_addr_t bpa, bus_size_t size,
 137               int cacheable, bus_space_handle_t *bshp)
 138 {
 139         const struct pmap_devmap        *pd;
 140
 141         paddr_t         startpa;
 142         paddr_t         endpa;
 143         paddr_t         pa;
 144         paddr_t         offset;
 145         vaddr_t         va;
 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         /* Get some VM.  */
 158         va = uvm_km_alloc(kernel_map, endpa - startpa, 0,
 159             UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
 160         if (va == 0)
 161                 return ENOMEM;
 162
 163         /* Store the bus space handle */
 164         *bshp = va + offset;
 165
 166         /* Now map the pages */
 167         for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
 168                 pmap_enter(pmap_kernel(), va, pa,
 169                     VM_PROT_READ | VM_PROT_WRITE,
 170                     VM_PROT_READ | VM_PROT_WRITE | PMAP_WIRED);
 171         }
 172         pmap_update(pmap_kernel());
 173
 174         return(0);
 175 }
 176
 177 void
 178 at91_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
 179 {
 180         vaddr_t va;
 181         vaddr_t endva;
 182
 183         if (pmap_devmap_find_va(bsh, size) != NULL) {
 184                 /* Device was statically mapped; nothing to do. */
 185                 return;
 186         }
 187
 188         endva = round_page(bsh + size);
 189         va = trunc_page(bsh);
 190
 191         pmap_remove(pmap_kernel(), va, endva);
 192         pmap_update(pmap_kernel());
 193         uvm_km_free(kernel_map, va, endva - va, UVM_KMF_VAONLY);
 194 }
 195
 196 int
 197 at91_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend,
 198         bus_size_t size, bus_size_t alignment, bus_size_t boundary, int cacheable,
 199         bus_addr_t *bpap, bus_space_handle_t *bshp)
 200 {
 201         panic("at91_bs_alloc(): not implemented\n");
 202 }
 203
 204 void
 205 at91_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
 206 {
 207         panic("at91_bs_free(): not implemented\n");
 208 }
 209
 210 int
 211 at91_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
 212         bus_size_t size, bus_space_handle_t *nbshp)
 213 {
 214         *nbshp = bsh + offset;
 215         return (0);
 216 }
 217
 218 void *
 219 at91_bs_vaddr(void *t, bus_space_handle_t bsh)
 220 {
 221         return ((void *)bsh);
 222 }
 223
 224 paddr_t
 225 at91_bs_mmap(void *t, bus_addr_t addr, off_t off, int prot, int flags)
 226 {
 227         /* Not supported. */
 228         return (-1);
 229 }
 230
 231 void
 232 at91_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset,
 233     bus_size_t len, int flags)
 234 {
 235 /* NULL */
 236 }
 237 /* End of at91_io.c */