jazzdmatlb.c revision 1.9
1 /* $NetBSD: jazzdmatlb.c,v 1.9 2003/07/15 00:04:49 lukem 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/cdefs.h> 36 __KERNEL_RCSID(0, "$NetBSD: jazzdmatlb.c,v 1.9 2003/07/15 00:04:49 lukem Exp $"); 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/malloc.h> 41 #include <sys/extent.h> 42 #include <sys/device.h> 43 #include <sys/proc.h> 44 45 #include <uvm/uvm_extern.h> 46 47 #include <machine/autoconf.h> 48 #include <machine/bus.h> 49 50 #include <arc/jazz/jazzdmatlbreg.h> 51 #include <arc/jazz/jazzdmatlbvar.h> 52 53 #include <mips/cache.h> 54 55 extern paddr_t kvtophys __P((vaddr_t)); /* XXX */ 56 57 /* 58 * Currently, only NET and BIO devices use DMA, and splnet > splbio. 59 */ 60 #define spldma() splnet() 61 62 #define NDMATLB (JAZZ_DMATLB_SIZE / sizeof(jazz_dma_pte_t)) 63 64 static bus_space_tag_t dmatlb_iot; 65 static bus_space_handle_t dmatlb_ioh; 66 67 static struct extent *dmatlbmap; 68 static jazz_dma_pte_t *dma_tlb; 69 70 /* 71 * Initialize the dma mapping register area and pool. 72 */ 73 void 74 jazz_dmatlb_init(iot, ioaddr) 75 bus_space_tag_t iot; 76 bus_addr_t ioaddr; 77 { 78 int err; 79 80 dmatlb_iot = iot; 81 err = bus_space_map(iot, ioaddr, JAZZ_DMATLB_REGSIZE, 0, &dmatlb_ioh); 82 if (err != 0) 83 panic("jazz_dmatlb_init: cannot map 0x%lx", ioaddr); 84 85 dma_tlb = (jazz_dma_pte_t *)PICA_TL_BASE; 86 87 mips_dcache_wbinv_all();/* Make sure no map entries are cached */ 88 bzero((char *)dma_tlb, JAZZ_DMATLB_SIZE); 89 90 dmatlbmap = extent_create("dmatlb", 0, NDMATLB, M_DEVBUF, NULL, NULL, 91 EX_NOWAIT); 92 if (dmatlbmap == NULL) 93 panic("jazz_dmatlb_init: cannot create extent map"); 94 95 bus_space_write_4(dmatlb_iot, dmatlb_ioh, JAZZ_DMATLBREG_MAP, 96 MIPS_KSEG1_TO_PHYS(dma_tlb)); 97 bus_space_write_4(dmatlb_iot, dmatlb_ioh, JAZZ_DMATLBREG_LIMIT, 98 JAZZ_DMATLB_SIZE); 99 jazz_dmatlb_flush(); 100 } 101 102 /* 103 * Allocate an array of 'size' DMA PTEs. 104 * Return address to first pte. 105 */ 106 jazz_dma_pte_t * 107 jazz_dmatlb_alloc(npte, boundary, flags, addr) 108 int npte; 109 bus_size_t boundary; 110 int flags; 111 bus_addr_t *addr; 112 { 113 u_long start; 114 int err; 115 int s; 116 117 s = spldma(); 118 err = extent_alloc(dmatlbmap, npte, 1, boundary / JAZZ_DMA_PAGE_SIZE, 119 (flags & BUS_DMA_WAITOK) ? (EX_WAITSPACE | EX_WAITOK) : EX_NOWAIT, 120 &start); 121 splx(s); 122 123 if (err) 124 return (NULL); 125 126 *addr = start * JAZZ_DMA_PAGE_SIZE; 127 128 return (dma_tlb + start); 129 } 130 131 /* 132 * Free an array of DMA PTEs. 133 */ 134 void 135 jazz_dmatlb_free(addr, npte) 136 bus_addr_t addr; 137 int npte; 138 { 139 u_long start; 140 int s; 141 142 start = addr / JAZZ_DMA_PAGE_SIZE; 143 s = spldma(); 144 extent_free(dmatlbmap, start, npte, EX_NOWAIT); 145 splx(s); 146 } 147 148 /* 149 * Map up a virtual address space in dma space given by 150 * the dma control structure. 151 */ 152 void 153 jazz_dmatlb_map_va(p, va, size, dma_pte) 154 struct proc *p; 155 vaddr_t va; 156 vsize_t size; 157 jazz_dma_pte_t *dma_pte; 158 { 159 paddr_t pa; 160 161 size = jazz_dma_page_round(size + jazz_dma_page_offs(va)); 162 va &= JAZZ_DMA_PAGE_NUM; 163 while (size > 0) { 164 if (p != NULL) 165 (void)pmap_extract(p->p_vmspace->vm_map.pmap, va, &pa); 166 else 167 pa = kvtophys(va); 168 169 pa &= JAZZ_DMA_PAGE_NUM; 170 dma_pte->lo_addr = pa; 171 dma_pte->hi_addr = 0; 172 dma_pte++; 173 va += JAZZ_DMA_PAGE_SIZE; 174 size -= JAZZ_DMA_PAGE_SIZE; 175 } 176 } 177 178 /* 179 * Map up a physical address space in dma space given by 180 * the dma control structure. 181 */ 182 void 183 jazz_dmatlb_map_pa(pa, size, dma_pte) 184 paddr_t pa; 185 psize_t size; 186 jazz_dma_pte_t *dma_pte; 187 { 188 size = jazz_dma_page_round(size + jazz_dma_page_offs(pa)); 189 pa &= JAZZ_DMA_PAGE_NUM; 190 while (size > 0) { 191 dma_pte->lo_addr = pa; 192 dma_pte->hi_addr = 0; 193 dma_pte++; 194 pa += JAZZ_DMA_PAGE_SIZE; 195 size -= JAZZ_DMA_PAGE_SIZE; 196 } 197 } 198 199 /* 200 * Prepare for new dma by flushing 201 */ 202 void 203 jazz_dmatlb_flush() 204 { 205 bus_space_write_4(dmatlb_iot, dmatlb_ioh, JAZZ_DMATLBREG_IVALID, 0); 206 } 207
Indexes created Sat Sep 27 14:09:57 GMT 2025