sys/arch/arm/ixp12x0/ixp12x0_io.c

   1 /*      $NetBSD: ixp12x0_io.c,v 1.13 2009/10/21 14:15:50 rmind Exp $ */
   2
   3 /*
   4  * Copyright (c) 2002, 2003
   5  *      Ichiro FUKUHARA <ichiro@ichiro.org>.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY ICHIRO FUKUHARA ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL ICHIRO FUKUHARA OR THE VOICES IN HIS HEAD BE LIABLE FOR
  21  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __KERNEL_RCSID(0, "$NetBSD: ixp12x0_io.c,v 1.13 2009/10/21 14:15:50 rmind Exp $");
  32
  33 /*
  34  * bus_space I/O functions for ixp12x0
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/queue.h>
  40
  41 #include <uvm/uvm.h>
  42
  43 #include <machine/bus.h>
  44
  45 #include <arm/ixp12x0/ixp12x0reg.h>
  46 #include <arm/ixp12x0/ixp12x0var.h>
  47
  48 /* Proto types for all the bus_space structure functions */
  49 bs_protos(ixp12x0);
  50 bs_protos(generic);
  51 bs_protos(generic_armv4);
  52 bs_protos(bs_notimpl);
  53
  54 struct bus_space ixp12x0_bs_tag = {
  55         /* cookie */
  56         (void *) 0,
  57
  58         /* mapping/unmapping */
  59         ixp12x0_bs_map,
  60         ixp12x0_bs_unmap,
  61         ixp12x0_bs_subregion,
  62
  63         /* allocation/deallocation */
  64         ixp12x0_bs_alloc,
  65         ixp12x0_bs_free,
  66
  67         /* get kernel virtual address */
  68         ixp12x0_bs_vaddr,
  69
  70         /* mmap bus space for userland */
  71         bs_notimpl_bs_mmap,
  72
  73         /* barrier */
  74         ixp12x0_bs_barrier,
  75
  76         /* read (single) */
  77         generic_bs_r_1,
  78         generic_armv4_bs_r_2,
  79         generic_bs_r_4,
  80         bs_notimpl_bs_r_8,
  81
  82         /* read multiple */
  83         generic_bs_rm_1,
  84         generic_armv4_bs_rm_2,
  85         generic_bs_rm_4,
  86         bs_notimpl_bs_rm_8,
  87
  88         /* read region */
  89         generic_bs_rr_1,
  90         generic_armv4_bs_rr_2,
  91         generic_bs_rr_4,
  92         bs_notimpl_bs_rr_8,
  93
  94         /* write (single) */
  95         generic_bs_w_1,
  96         generic_armv4_bs_w_2,
  97         generic_bs_w_4,
  98         bs_notimpl_bs_w_8,
  99
 100         /* write multiple */
 101         generic_bs_wm_1,
 102         generic_armv4_bs_wm_2,
 103         generic_bs_wm_4,
 104         bs_notimpl_bs_wm_8,
 105
 106         /* write region */
 107         generic_bs_wr_1,
 108         generic_armv4_bs_wr_2,
 109         generic_bs_wr_4,
 110         bs_notimpl_bs_wr_8,
 111
 112         /* set multiple */
 113         bs_notimpl_bs_sm_1,
 114         bs_notimpl_bs_sm_2,
 115         bs_notimpl_bs_sm_4,
 116         bs_notimpl_bs_sm_8,
 117
 118         /* set region */
 119         bs_notimpl_bs_sr_1,
 120         generic_armv4_bs_sr_2,
 121         generic_bs_sr_4,
 122         bs_notimpl_bs_sr_8,
 123
 124         /* copy */
 125         bs_notimpl_bs_c_1,
 126         generic_armv4_bs_c_2,
 127         bs_notimpl_bs_c_4,
 128         bs_notimpl_bs_c_8,
 129 };
 130
 131 /* Common routines */
 132
 133 int
 134 ixp12x0_bs_map(void *t, bus_addr_t bpa, bus_size_t size,
 135                int flags, bus_space_handle_t *bshp)
 136 {
 137         const struct pmap_devmap        *pd;
 138
 139         paddr_t         startpa;
 140         paddr_t         endpa;
 141         paddr_t         pa;
 142         paddr_t         offset;
 143         vaddr_t         va;
 144         pt_entry_t      *pte;
 145
 146         if ((pd = pmap_devmap_find_pa(bpa, size)) != NULL) {
 147                 /* Device was statically mapped. */
 148                 *bshp = pd->pd_va + (bpa - pd->pd_pa);
 149                 return 0;
 150         }
 151
 152         endpa = round_page(bpa + size);
 153         offset = bpa & PAGE_MASK;
 154         startpa = trunc_page(bpa);
 155
 156         va = uvm_km_alloc(kernel_map, endpa - startpa, 0,
 157             UVM_KMF_VAONLY | UVM_KMF_NOWAIT);
 158         if (va  == 0)
 159                 return ENOMEM;
 160
 161         *bshp = va + offset;
 162
 163         for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
 164                 pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE, 0);
 165                 pte = vtopte(va);
 166                 *pte &= ~L2_S_CACHE_MASK;
 167                 PTE_SYNC(pte);
 168         }
 169         pmap_update(pmap_kernel());
 170
 171         return 0;
 172 }
 173
 174 void
 175 ixp12x0_bs_unmap(void *t, bus_space_handle_t bsh, bus_size_t size)
 176 {
 177         vaddr_t va;
 178         vaddr_t endva;
 179
 180         if (pmap_devmap_find_va(bsh, size) != NULL) {
 181                 /* Device was statically mapped; nothing to do. */
 182                 return;
 183         }
 184
 185         endva = round_page(bsh + size);
 186         va = trunc_page(bsh);
 187
 188         pmap_kremove(va, endva - va);
 189         uvm_km_free(kernel_map, va, endva - va, UVM_KMF_VAONLY);
 190 }
 191
 192 int
 193 ixp12x0_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp)
 194 {
 195
 196         *nbshp = bsh + offset;
 197         return (0);
 198 }
 199
 200 void *
 201 ixp12x0_bs_vaddr(void *t, bus_space_handle_t bsh)
 202 {
 203         return ((void *)bsh);
 204 }
 205
 206 int
 207 ixp12x0_bs_alloc(void *t,
 208                  bus_addr_t rstart, bus_addr_t rend, bus_size_t size,
 209                  bus_size_t alignment, bus_size_t boundary,
 210                  int flags, bus_addr_t *bpap,
 211                  bus_space_handle_t *bshp)
 212 {
 213         panic("ixp12x0_bs_alloc(): not implemented\n");
 214 }
 215
 216 void
 217 ixp12x0_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
 218 {
 219         panic("ixp12x0_bs_free(): not implemented\n");
 220 }
 221
 222 void
 223 ixp12x0_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset, bus_size_t len, int flags)
 224 {
 225 /* NULL */
 226 }
 227
 228 /* End of ixp12x0_io.c */