jazzdmatlb.c revision 1.3.2.4
1 /* $NetBSD: jazzdmatlb.c,v 1.3.2.4 2001/01/05 17:33:58 bouyer Exp $ */ 2 /* $OpenBSD: dma.c,v 1.5 1998/03/01 16:49:57 niklas Exp $ */ 3 4 /*- 5 * Copyright (C) 2000 Shuichiro URATA. 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. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 /* 31 * Jazz derived system dma driver. Handles resource allocation and 32 * logical (virtual) address remaping. 33 */ 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/malloc.h> 38 #include <sys/extent.h> 39 #include <sys/device.h> 40 41 #include <uvm/uvm_extern.h> 42 43 #include <machine/autoconf.h> 44 #include <machine/bus.h> 45 46 #include <arc/jazz/jazzdmatlbreg.h> 47 #include <arc/jazz/jazzdmatlbvar.h> 48 49 extern paddr_t kvtophys __P((vaddr_t)); /* XXX */ 50 51 /* 52 * Currently, only NET and BIO devices use DMA, and splnet > splbio. 53 */ 54 #define spldma() splnet() 55 56 #define NDMATLB (JAZZ_DMATLB_SIZE / sizeof(jazz_dma_pte_t)) 57 58 static bus_space_tag_t dmatlb_iot; 59 static bus_space_handle_t dmatlb_ioh; 60 61 static struct extent *dmatlbmap; 62 static jazz_dma_pte_t *dma_tlb; 63 64 /* 65 * Initialize the dma mapping register area and pool. 66 */ 67 void 68 jazz_dmatlb_init(iot, ioaddr) 69 bus_space_tag_t iot; 70 bus_addr_t ioaddr; 71 { 72 int err; 73 74 dmatlb_iot = iot; 75 err = bus_space_map(iot, ioaddr, JAZZ_DMATLB_REGSIZE, 0, &dmatlb_ioh); 76 if (err != 0) 77 panic("jazz_dmatlb_init: cannot map 0x%lx\n", ioaddr); 78 79 dma_tlb = (jazz_dma_pte_t *)PICA_TL_BASE; 80 81 mips3_FlushCache(); /* Make sure no map entries are cached */ 82 bzero((char *)dma_tlb, JAZZ_DMATLB_SIZE); 83 84 dmatlbmap = extent_create("dmatlb", 0, NDMATLB, M_DEVBUF, NULL, NULL, 85 EX_NOWAIT); 86 if (dmatlbmap == NULL) 87 panic("jazz_dmatlb_init: cannot create extent map"); 88 89 bus_space_write_4(dmatlb_iot, dmatlb_ioh, JAZZ_DMATLBREG_MAP, 90 MIPS_KSEG1_TO_PHYS(dma_tlb)); 91 bus_space_write_4(dmatlb_iot, dmatlb_ioh, JAZZ_DMATLBREG_LIMIT, 92 JAZZ_DMATLB_SIZE); 93 jazz_dmatlb_flush(); 94 } 95 96 /* 97 * Allocate an array of 'size' DMA PTEs. 98 * Return address to first pte. 99 */ 100 jazz_dma_pte_t * 101 jazz_dmatlb_alloc(npte, boundary, flags, addr) 102 int npte; 103 bus_size_t boundary; 104 int flags; 105 bus_addr_t *addr; 106 { 107 u_long start; 108 int err; 109 int s; 110 111 s = spldma(); 112 err = extent_alloc(dmatlbmap, npte, 1, boundary / JAZZ_DMA_PAGE_SIZE, 113 (flags & BUS_DMA_WAITOK) ? (EX_WAITSPACE | EX_WAITOK) : EX_NOWAIT, 114 &start); 115 splx(s); 116 117 if (err) 118 return (NULL); 119 120 *addr = start * JAZZ_DMA_PAGE_SIZE; 121 122 return (dma_tlb + start); 123 } 124 125 /* 126 * Free an array of DMA PTEs. 127 */ 128 void 129 jazz_dmatlb_free(addr, npte) 130 bus_addr_t addr; 131 int npte; 132 { 133 u_long start; 134 int s; 135 136 start = addr / JAZZ_DMA_PAGE_SIZE; 137 s = spldma(); 138 extent_free(dmatlbmap, start, npte, EX_NOWAIT); 139 splx(s); 140 } 141 142 /* 143 * Map up a virtual address space in dma space given by 144 * the dma control structure. 145 */ 146 void 147 jazz_dmatlb_map_va(p, va, size, dma_pte) 148 struct proc *p; 149 vaddr_t va; 150 vsize_t size; 151 jazz_dma_pte_t *dma_pte; 152 { 153 paddr_t pa; 154 155 size = jazz_dma_page_round(size + jazz_dma_page_offs(va)); 156 va &= JAZZ_DMA_PAGE_NUM; 157 while (size > 0) { 158 if (p != NULL) 159 (void)pmap_extract(p->p_vmspace->vm_map.pmap, va, &pa); 160 else 161 pa = kvtophys(va); 162 163 pa &= JAZZ_DMA_PAGE_NUM; 164 dma_pte->lo_addr = pa; 165 dma_pte->hi_addr = 0; 166 dma_pte++; 167 va += JAZZ_DMA_PAGE_SIZE; 168 size -= JAZZ_DMA_PAGE_SIZE; 169 } 170 } 171 172 /* 173 * Map up a physical address space in dma space given by 174 * the dma control structure. 175 */ 176 void 177 jazz_dmatlb_map_pa(pa, size, dma_pte) 178 paddr_t pa; 179 psize_t size; 180 jazz_dma_pte_t *dma_pte; 181 { 182 size = jazz_dma_page_round(size + jazz_dma_page_offs(pa)); 183 pa &= JAZZ_DMA_PAGE_NUM; 184 while (size > 0) { 185 dma_pte->lo_addr = pa; 186 dma_pte->hi_addr = 0; 187 dma_pte++; 188 pa += JAZZ_DMA_PAGE_SIZE; 189 size -= JAZZ_DMA_PAGE_SIZE; 190 } 191 } 192 193 /* 194 * Prepare for new dma by flushing 195 */ 196 void 197 jazz_dmatlb_flush() 198 { 199 bus_space_write_4(dmatlb_iot, dmatlb_ioh, JAZZ_DMATLBREG_IVALID, 0); 200 } 201
Indexes created Wed Oct 22 13:09:56 GMT 2025