1 /* $NetBSD: jazzdmatlb.c,v 1.17 2020/06/17 06:20:05 thorpej 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 1.17 2020/06/17 06:20:05 thorpej Exp $"); 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/malloc.h> 41 #include <sys/device.h> 42 #include <sys/proc.h> 43 #include <sys/vmem.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 #define NDMATLB (JAZZ_DMATLB_SIZE / sizeof(jazz_dma_pte_t)) 58 59 static bus_space_tag_t dmatlb_iot; 60 static bus_space_handle_t dmatlb_ioh; 61 62 static vmem_t *dmatlb_arena; 63 static jazz_dma_pte_t *dma_tlb; 64 65 /* 66 * Initialize the dma mapping register area and pool. 67 */ 68 void 69 jazz_dmatlb_init(bus_space_tag_t iot, bus_addr_t ioaddr) 70 { 71 int err; 72 73 dmatlb_iot = iot; 74 err = bus_space_map(iot, ioaddr, JAZZ_DMATLB_REGSIZE, 0, &dmatlb_ioh); 75 if (err != 0) 76 panic("jazz_dmatlb_init: cannot map 0x%lx", ioaddr); 77 78 dma_tlb = (jazz_dma_pte_t *)PICA_TL_BASE; 79 80 mips_dcache_wbinv_all();/* Make sure no map entries are cached */ 81 memset((char *)dma_tlb, 0, JAZZ_DMATLB_SIZE); 82 83 dmatlb_arena = vmem_create("dmatlb", 0, NDMATLB, 84 1, /* quantum */ 85 NULL, /* importfn */ 86 NULL, /* releasefn */ 87 NULL, /* source */ 88 0, /* qcache_max */ 89 VM_SLEEP, 90 IPL_VM); 91 KASSERT(dmatlb_arena != NULL); 92 93 bus_space_write_4(dmatlb_iot, dmatlb_ioh, JAZZ_DMATLBREG_MAP, 94 MIPS_KSEG1_TO_PHYS(dma_tlb)); 95 bus_space_write_4(dmatlb_iot, dmatlb_ioh, JAZZ_DMATLBREG_LIMIT, 96 JAZZ_DMATLB_SIZE); 97 jazz_dmatlb_flush(); 98 } 99 100 /* 101 * Allocate an array of 'size' DMA PTEs. 102 * Return address to first pte. 103 */ 104 jazz_dma_pte_t * 105 jazz_dmatlb_alloc(int npte, bus_size_t boundary, int flags, bus_addr_t *addr) 106 { 107 vmem_addr_t start; 108 int err; 109 110 const vm_flag_t vmflags = VM_INSTANTFIT | 111 ((flags & BUS_DMA_WAITOK) ? VM_SLEEP : VM_NOSLEEP); 112 113 err = vmem_xalloc(dmatlb_arena, npte, 114 1, /* align */ 115 0, /* phase */ 116 boundary / JAZZ_DMA_PAGE_SIZE, 117 VMEM_ADDR_MIN, 118 VMEM_ADDR_MAX, 119 vmflags, 120 &start); 121 if (err) 122 return NULL; 123 124 *addr = start * JAZZ_DMA_PAGE_SIZE; 125 126 return dma_tlb + start; 127 } 128 129 /* 130 * Free an array of DMA PTEs. 131 */ 132 void 133 jazz_dmatlb_free(bus_addr_t addr, int npte) 134 { 135 vmem_addr_t start; 136 137 start = addr / JAZZ_DMA_PAGE_SIZE; 138 vmem_xfree(dmatlb_arena, start, npte); 139 } 140 141 /* 142 * Map up a virtual address space in dma space given by 143 * the dma control structure. 144 */ 145 void 146 jazz_dmatlb_map_va(struct vmspace *vm, vaddr_t va, vsize_t size, 147 jazz_dma_pte_t *dma_pte) 148 { 149 paddr_t pa; 150 151 size = jazz_dma_page_round(size + jazz_dma_page_offs(va)); 152 va &= JAZZ_DMA_PAGE_NUM; 153 while (size > 0) { 154 if (!VMSPACE_IS_KERNEL_P(vm)) 155 (void)pmap_extract(vm_map_pmap(&vm->vm_map), va, &pa); 156 else 157 pa = kvtophys(va); 158 159 pa &= JAZZ_DMA_PAGE_NUM; 160 dma_pte->lo_addr = pa; 161 dma_pte->hi_addr = 0; 162 dma_pte++; 163 va += JAZZ_DMA_PAGE_SIZE; 164 size -= JAZZ_DMA_PAGE_SIZE; 165 } 166 } 167 168 /* 169 * Map up a physical address space in dma space given by 170 * the dma control structure. 171 */ 172 void 173 jazz_dmatlb_map_pa(paddr_t pa, psize_t size, jazz_dma_pte_t *dma_pte) 174 { 175 176 size = jazz_dma_page_round(size + jazz_dma_page_offs(pa)); 177 pa &= JAZZ_DMA_PAGE_NUM; 178 while (size > 0) { 179 dma_pte->lo_addr = pa; 180 dma_pte->hi_addr = 0; 181 dma_pte++; 182 pa += JAZZ_DMA_PAGE_SIZE; 183 size -= JAZZ_DMA_PAGE_SIZE; 184 } 185 } 186 187 /* 188 * Prepare for new dma by flushing 189 */ 190 void 191 jazz_dmatlb_flush(void) 192 { 193 194 bus_space_write_4(dmatlb_iot, dmatlb_ioh, JAZZ_DMATLBREG_IVALID, 0); 195 } 196