Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 | /* $Id: io-unit.c,v 1.24 2001/12/17 07:05:09 davem Exp $ * io-unit.c: IO-UNIT specific routines for memory management. * * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) */ #include <linux/config.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <asm/scatterlist.h> #include <asm/pgalloc.h> #include <asm/pgtable.h> #include <asm/sbus.h> #include <asm/io.h> #include <asm/io-unit.h> #include <asm/mxcc.h> #include <asm/bitops.h> /* #define IOUNIT_DEBUG */ #ifdef IOUNIT_DEBUG #define IOD(x) printk(x) #else #define IOD(x) do { } while (0) #endif #define IOPERM (IOUPTE_CACHE | IOUPTE_WRITE | IOUPTE_VALID) #define MKIOPTE(phys) __iopte((((phys)>>4) & IOUPTE_PAGE) | IOPERM) void __init iounit_init(int sbi_node, int io_node, struct sbus_bus *sbus) { iopte_t *xpt, *xptend; struct iounit_struct *iounit; struct linux_prom_registers iommu_promregs[PROMREG_MAX]; struct resource r; iounit = kmalloc(sizeof(struct iounit_struct), GFP_ATOMIC); memset(iounit, 0, sizeof(*iounit)); iounit->limit[0] = IOUNIT_BMAP1_START; iounit->limit[1] = IOUNIT_BMAP2_START; iounit->limit[2] = IOUNIT_BMAPM_START; iounit->limit[3] = IOUNIT_BMAPM_END; iounit->rotor[1] = IOUNIT_BMAP2_START; iounit->rotor[2] = IOUNIT_BMAPM_START; prom_getproperty(sbi_node, "reg", (void *) iommu_promregs, sizeof(iommu_promregs)); prom_apply_generic_ranges(io_node, 0, iommu_promregs, 3); memset(&r, 0, sizeof(r)); r.flags = iommu_promregs[2].which_io; r.start = iommu_promregs[2].phys_addr; xpt = (iopte_t *) sbus_ioremap(&r, 0, PAGE_SIZE * 16, "XPT"); if(!xpt) panic("Cannot map External Page Table."); sbus->iommu = (struct iommu_struct *)iounit; iounit->page_table = xpt; for (xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t); xpt < xptend;) *xpt++ = 0; } /* One has to hold iounit->lock to call this */ static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long vaddr, int size) { int i, j, k, npages; unsigned long rotor, scan, limit; iopte_t iopte; npages = ((vaddr & ~PAGE_MASK) + size + (PAGE_SIZE-1)) >> PAGE_SHIFT; /* A tiny bit of magic ingredience :) */ switch (npages) { case 1: i = 0x0231; break; case 2: i = 0x0132; break; default: i = 0x0213; break; } IOD(("iounit_get_area(%08lx,%d[%d])=", vaddr, size, npages)); next: j = (i & 15); rotor = iounit->rotor[j - 1]; limit = iounit->limit[j]; scan = rotor; nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan); if (scan + npages > limit) { if (limit != rotor) { limit = rotor; scan = iounit->limit[j - 1]; goto nexti; } i >>= 4; if (!(i & 15)) panic("iounit_get_area: Couldn't find free iopte slots for (%08lx,%d)\n", vaddr, size); goto next; } for (k = 1, scan++; k < npages; k++) if (test_bit(scan++, iounit->bmap)) goto nexti; iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1]; scan -= npages; iopte = MKIOPTE(__pa(vaddr & PAGE_MASK)); vaddr = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + (vaddr & ~PAGE_MASK); for (k = 0; k < npages; k++, iopte = __iopte(iopte_val(iopte) + 0x100), scan++) { set_bit(scan, iounit->bmap); iounit->page_table[scan] = iopte; } IOD(("%08lx\n", vaddr)); return vaddr; } static __u32 iounit_get_scsi_one(char *vaddr, unsigned long len, struct sbus_bus *sbus) { unsigned long ret, flags; struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; spin_lock_irqsave(&iounit->lock, flags); ret = iounit_get_area(iounit, (unsigned long)vaddr, len); spin_unlock_irqrestore(&iounit->lock, flags); return ret; } static void iounit_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus) { unsigned long flags; struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; /* FIXME: Cache some resolved pages - often several sg entries are to the same page */ spin_lock_irqsave(&iounit->lock, flags); for (; sz >= 0; sz--) { sg[sz].dvma_address = iounit_get_area(iounit, (unsigned long)page_address(sg[sz].page) + sg[sz].offset, sg[sz].length); sg[sz].dvma_length = sg[sz].length; } spin_unlock_irqrestore(&iounit->lock, flags); } static void iounit_release_scsi_one(__u32 vaddr, unsigned long len, struct sbus_bus *sbus) { unsigned long flags; struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; spin_lock_irqsave(&iounit->lock, flags); len = ((vaddr & ~PAGE_MASK) + len + (PAGE_SIZE-1)) >> PAGE_SHIFT; vaddr = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT; IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr)); for (len += vaddr; vaddr < len; vaddr++) clear_bit(vaddr, iounit->bmap); spin_unlock_irqrestore(&iounit->lock, flags); } static void iounit_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus) { unsigned long flags; unsigned long vaddr, len; struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; spin_lock_irqsave(&iounit->lock, flags); for (; sz >= 0; sz--) { len = ((sg[sz].dvma_address & ~PAGE_MASK) + sg[sz].length + (PAGE_SIZE-1)) >> PAGE_SHIFT; vaddr = (sg[sz].dvma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT; IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr)); for (len += vaddr; vaddr < len; vaddr++) clear_bit(vaddr, iounit->bmap); } spin_unlock_irqrestore(&iounit->lock, flags); } #ifdef CONFIG_SBUS static void iounit_map_dma_area(unsigned long va, __u32 addr, int len) { unsigned long page, end; pgprot_t dvma_prot; iopte_t *iopte; struct sbus_bus *sbus; dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV); end = PAGE_ALIGN((addr + len)); while(addr < end) { page = va; { pgd_t *pgdp; pmd_t *pmdp; pte_t *ptep; long i; pgdp = pgd_offset(init_task.mm, addr); pmdp = pmd_offset(pgdp, addr); ptep = pte_offset(pmdp, addr); set_pte(ptep, pte_val(mk_pte(virt_to_page(page), dvma_prot))); i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT); for_each_sbus(sbus) { struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; iopte = (iopte_t *)(iounit->page_table + i); *iopte = __iopte(MKIOPTE(__pa(page))); } } addr += PAGE_SIZE; va += PAGE_SIZE; } flush_cache_all(); flush_tlb_all(); } static void iounit_unmap_dma_area(unsigned long addr, int len) { /* XXX Somebody please fill this in */ } /* XXX We do not pass sbus device here, bad. */ static unsigned long iounit_translate_dvma(unsigned long addr) { struct sbus_bus *sbus = sbus_root; /* They are all the same */ struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; int i; iopte_t *iopte; i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT); iopte = (iopte_t *)(iounit->page_table + i); return (iopte_val(*iopte) & 0xFFFFFFF0) << 4; /* XXX sun4d guru, help */ } #endif static char *iounit_lockarea(char *vaddr, unsigned long len) { /* FIXME: Write this */ return vaddr; } static void iounit_unlockarea(char *vaddr, unsigned long len) { /* FIXME: Write this */ } void __init ld_mmu_iounit(void) { BTFIXUPSET_CALL(mmu_lockarea, iounit_lockarea, BTFIXUPCALL_RETO0); BTFIXUPSET_CALL(mmu_unlockarea, iounit_unlockarea, BTFIXUPCALL_NOP); BTFIXUPSET_CALL(mmu_get_scsi_one, iounit_get_scsi_one, BTFIXUPCALL_NORM); BTFIXUPSET_CALL(mmu_get_scsi_sgl, iounit_get_scsi_sgl, BTFIXUPCALL_NORM); BTFIXUPSET_CALL(mmu_release_scsi_one, iounit_release_scsi_one, BTFIXUPCALL_NORM); BTFIXUPSET_CALL(mmu_release_scsi_sgl, iounit_release_scsi_sgl, BTFIXUPCALL_NORM); #ifdef CONFIG_SBUS BTFIXUPSET_CALL(mmu_map_dma_area, iounit_map_dma_area, BTFIXUPCALL_NORM); BTFIXUPSET_CALL(mmu_unmap_dma_area, iounit_unmap_dma_area, BTFIXUPCALL_NORM); BTFIXUPSET_CALL(mmu_translate_dvma, iounit_translate_dvma, BTFIXUPCALL_NORM); #endif } __u32 iounit_map_dma_init(struct sbus_bus *sbus, int size) { int i, j, k, npages; unsigned long rotor, scan, limit; unsigned long flags; __u32 ret; struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; npages = (size + (PAGE_SIZE-1)) >> PAGE_SHIFT; i = 0x0213; spin_lock_irqsave(&iounit->lock, flags); next: j = (i & 15); rotor = iounit->rotor[j - 1]; limit = iounit->limit[j]; scan = rotor; nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan); if (scan + npages > limit) { if (limit != rotor) { limit = rotor; scan = iounit->limit[j - 1]; goto nexti; } i >>= 4; if (!(i & 15)) panic("iounit_map_dma_init: Couldn't find free iopte slots for %d bytes\n", size); goto next; } for (k = 1, scan++; k < npages; k++) if (test_bit(scan++, iounit->bmap)) goto nexti; iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1]; scan -= npages; ret = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT); for (k = 0; k < npages; k++, scan++) set_bit(scan, iounit->bmap); spin_unlock_irqrestore(&iounit->lock, flags); return ret; } __u32 iounit_map_dma_page(__u32 vaddr, void *addr, struct sbus_bus *sbus) { int scan = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT; struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; iounit->page_table[scan] = MKIOPTE(__pa(((unsigned long)addr) & PAGE_MASK)); return vaddr + (((unsigned long)addr) & ~PAGE_MASK); } |