jazzdmatlb.c revision 1.15.6.1
1 /* $NetBSD: jazzdmatlb.c,v 1.15.6.1 2012/02/18 07:31:21 mrg 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 1.15.6.1 2012/02/18 07:31:21 mrg 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 <sys/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(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(bus_space_tag_t iot, bus_addr_t ioaddr) 75 { 76 int err; 77 78 dmatlb_iot = iot; 79 err = bus_space_map(iot, ioaddr, JAZZ_DMATLB_REGSIZE, 0, &dmatlb_ioh); 80 if (err != 0) 81 panic("jazz_dmatlb_init: cannot map 0x%lx", ioaddr); 82 83 dma_tlb = (jazz_dma_pte_t *)PICA_TL_BASE; 84 85 mips_dcache_wbinv_all();/* Make sure no map entries are cached */ 86 memset((char *)dma_tlb, 0, JAZZ_DMATLB_SIZE); 87 88 dmatlbmap = extent_create("dmatlb", 0, NDMATLB, NULL, 0, EX_NOWAIT); 89 if (dmatlbmap == NULL) 90 panic("jazz_dmatlb_init: cannot create extent map"); 91 92 bus_space_write_4(dmatlb_iot, dmatlb_ioh, JAZZ_DMATLBREG_MAP, 93 MIPS_KSEG1_TO_PHYS(dma_tlb)); 94 bus_space_write_4(dmatlb_iot, dmatlb_ioh, JAZZ_DMATLBREG_LIMIT, 95 JAZZ_DMATLB_SIZE); 96 jazz_dmatlb_flush(); 97 } 98 99 /* 100 * Allocate an array of 'size' DMA PTEs. 101 * Return address to first pte. 102 */ 103 jazz_dma_pte_t * 104 jazz_dmatlb_alloc(int npte, bus_size_t boundary, int flags, bus_addr_t *addr) 105 { 106 u_long start; 107 int err; 108 int s; 109 110 s = spldma(); 111 err = extent_alloc(dmatlbmap, npte, 1, boundary / JAZZ_DMA_PAGE_SIZE, 112 (flags & BUS_DMA_WAITOK) ? (EX_WAITSPACE | EX_WAITOK) : EX_NOWAIT, 113 &start); 114 splx(s); 115 116 if (err) 117 return NULL; 118 119 *addr = start * JAZZ_DMA_PAGE_SIZE; 120 121 return dma_tlb + start; 122 } 123 124 /* 125 * Free an array of DMA PTEs. 126 */ 127 void 128 jazz_dmatlb_free(bus_addr_t addr, int npte) 129 { 130 u_long start; 131 int s; 132 133 start = addr / JAZZ_DMA_PAGE_SIZE; 134 s = spldma(); 135 extent_free(dmatlbmap, start, npte, EX_NOWAIT); 136 splx(s); 137 } 138 139 /* 140 * Map up a virtual address space in dma space given by 141 * the dma control structure. 142 */ 143 void 144 jazz_dmatlb_map_va(struct vmspace *vm, vaddr_t va, vsize_t size, 145 jazz_dma_pte_t *dma_pte) 146 { 147 paddr_t pa; 148 149 size = jazz_dma_page_round(size + jazz_dma_page_offs(va)); 150 va &= JAZZ_DMA_PAGE_NUM; 151 while (size > 0) { 152 if (!VMSPACE_IS_KERNEL_P(vm)) 153 (void)pmap_extract(vm_map_pmap(&vm->vm_map), va, &pa); 154 else 155 pa = kvtophys(va); 156 157 pa &= JAZZ_DMA_PAGE_NUM; 158 dma_pte->lo_addr = pa; 159 dma_pte->hi_addr = 0; 160 dma_pte++; 161 va += JAZZ_DMA_PAGE_SIZE; 162 size -= JAZZ_DMA_PAGE_SIZE; 163 } 164 } 165 166 /* 167 * Map up a physical address space in dma space given by 168 * the dma control structure. 169 */ 170 void 171 jazz_dmatlb_map_pa(paddr_t pa, psize_t size, jazz_dma_pte_t *dma_pte) 172 { 173 174 size = jazz_dma_page_round(size + jazz_dma_page_offs(pa)); 175 pa &= JAZZ_DMA_PAGE_NUM; 176 while (size > 0) { 177 dma_pte->lo_addr = pa; 178 dma_pte->hi_addr = 0; 179 dma_pte++; 180 pa += JAZZ_DMA_PAGE_SIZE; 181 size -= JAZZ_DMA_PAGE_SIZE; 182 } 183 } 184 185 /* 186 * Prepare for new dma by flushing 187 */ 188 void 189 jazz_dmatlb_flush(void) 190 { 191 192 bus_space_write_4(dmatlb_iot, dmatlb_ioh, JAZZ_DMATLBREG_IVALID, 0); 193 } 194
Indexes created Wed Oct 22 13:09:56 GMT 2025