1 /* 2 * io-unit.c: IO-UNIT specific routines for memory management. 3 * 4 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 5 */ 6 7 #include <linux/kernel.h> 8 #include <linux/init.h> 9 #include <linux/slab.h> 10 #include <linux/spinlock.h> 11 #include <linux/mm.h> 12 #include <linux/highmem.h> /* pte_offset_map => kmap_atomic */ 13 #include <linux/bitops.h> 14 #include <linux/scatterlist.h> 15 16 #include <asm/pgalloc.h> 17 #include <asm/pgtable.h> 18 #include <asm/sbus.h> 19 #include <asm/io.h> 20 #include <asm/io-unit.h> 21 #include <asm/mxcc.h> 22 #include <asm/cacheflush.h> 23 #include <asm/tlbflush.h> 24 #include <asm/dma.h> 25 #include <asm/oplib.h> 26 27 /* #define IOUNIT_DEBUG */ 28 #ifdef IOUNIT_DEBUG 29 #define IOD(x) printk(x) 30 #else 31 #define IOD(x) do { } while (0) 32 #endif 33 34 #define IOPERM (IOUPTE_CACHE | IOUPTE_WRITE | IOUPTE_VALID) 35 #define MKIOPTE(phys) __iopte((((phys)>>4) & IOUPTE_PAGE) | IOPERM) 36 37 void __init 38 iounit_init(int sbi_node, int io_node, struct sbus_bus *sbus) 39 { 40 iopte_t *xpt, *xptend; 41 struct iounit_struct *iounit; 42 struct linux_prom_registers iommu_promregs[PROMREG_MAX]; 43 struct resource r; 44 45 iounit = kzalloc(sizeof(struct iounit_struct), GFP_ATOMIC); 46 if (!iounit) { 47 prom_printf("SUN4D: Cannot alloc iounit, halting.\n"); 48 prom_halt(); 49 } 50 51 iounit->limit[0] = IOUNIT_BMAP1_START; 52 iounit->limit[1] = IOUNIT_BMAP2_START; 53 iounit->limit[2] = IOUNIT_BMAPM_START; 54 iounit->limit[3] = IOUNIT_BMAPM_END; 55 iounit->rotor[1] = IOUNIT_BMAP2_START; 56 iounit->rotor[2] = IOUNIT_BMAPM_START; 57 58 xpt = NULL; 59 if(prom_getproperty(sbi_node, "reg", (void *) iommu_promregs, 60 sizeof(iommu_promregs)) != -1) { 61 prom_apply_generic_ranges(io_node, 0, iommu_promregs, 3); 62 memset(&r, 0, sizeof(r)); 63 r.flags = iommu_promregs[2].which_io; 64 r.start = iommu_promregs[2].phys_addr; 65 xpt = (iopte_t *) sbus_ioremap(&r, 0, PAGE_SIZE * 16, "XPT"); 66 } 67 if(!xpt) panic("Cannot map External Page Table."); 68 69 sbus->ofdev.dev.archdata.iommu = iounit; 70 iounit->page_table = xpt; 71 spin_lock_init(&iounit->lock); 72 73 for (xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t); 74 xpt < xptend;) 75 iopte_val(*xpt++) = 0; 76 } 77 78 /* One has to hold iounit->lock to call this */ 79 static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long vaddr, int size) 80 { 81 int i, j, k, npages; 82 unsigned long rotor, scan, limit; 83 iopte_t iopte; 84 85 npages = ((vaddr & ~PAGE_MASK) + size + (PAGE_SIZE-1)) >> PAGE_SHIFT; 86 87 /* A tiny bit of magic ingredience :) */ 88 switch (npages) { 89 case 1: i = 0x0231; break; 90 case 2: i = 0x0132; break; 91 default: i = 0x0213; break; 92 } 93 94 IOD(("iounit_get_area(%08lx,%d[%d])=", vaddr, size, npages)); 95 96 next: j = (i & 15); 97 rotor = iounit->rotor[j - 1]; 98 limit = iounit->limit[j]; 99 scan = rotor; 100 nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan); 101 if (scan + npages > limit) { 102 if (limit != rotor) { 103 limit = rotor; 104 scan = iounit->limit[j - 1]; 105 goto nexti; 106 } 107 i >>= 4; 108 if (!(i & 15)) 109 panic("iounit_get_area: Couldn't find free iopte slots for (%08lx,%d)\n", vaddr, size); 110 goto next; 111 } 112 for (k = 1, scan++; k < npages; k++) 113 if (test_bit(scan++, iounit->bmap)) 114 goto nexti; 115 iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1]; 116 scan -= npages; 117 iopte = MKIOPTE(__pa(vaddr & PAGE_MASK)); 118 vaddr = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + (vaddr & ~PAGE_MASK); 119 for (k = 0; k < npages; k++, iopte = __iopte(iopte_val(iopte) + 0x100), scan++) { 120 set_bit(scan, iounit->bmap); 121 iounit->page_table[scan] = iopte; 122 } 123 IOD(("%08lx\n", vaddr)); 124 return vaddr; 125 } 126 127 static __u32 iounit_get_scsi_one(char *vaddr, unsigned long len, struct sbus_bus *sbus) 128 { 129 unsigned long ret, flags; 130 struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu; 131 132 spin_lock_irqsave(&iounit->lock, flags); 133 ret = iounit_get_area(iounit, (unsigned long)vaddr, len); 134 spin_unlock_irqrestore(&iounit->lock, flags); 135 return ret; 136 } 137 138 static void iounit_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus) 139 { 140 unsigned long flags; 141 struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu; 142 143 /* FIXME: Cache some resolved pages - often several sg entries are to the same page */ 144 spin_lock_irqsave(&iounit->lock, flags); 145 while (sz != 0) { 146 --sz; 147 sg->dvma_address = iounit_get_area(iounit, (unsigned long) sg_virt(sg), sg->length); 148 sg->dvma_length = sg->length; 149 sg = sg_next(sg); 150 } 151 spin_unlock_irqrestore(&iounit->lock, flags); 152 } 153 154 static void iounit_release_scsi_one(__u32 vaddr, unsigned long len, struct sbus_bus *sbus) 155 { 156 unsigned long flags; 157 struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu; 158 159 spin_lock_irqsave(&iounit->lock, flags); 160 len = ((vaddr & ~PAGE_MASK) + len + (PAGE_SIZE-1)) >> PAGE_SHIFT; 161 vaddr = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT; 162 IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr)); 163 for (len += vaddr; vaddr < len; vaddr++) 164 clear_bit(vaddr, iounit->bmap); 165 spin_unlock_irqrestore(&iounit->lock, flags); 166 } 167 168 static void iounit_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus) 169 { 170 unsigned long flags; 171 unsigned long vaddr, len; 172 struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu; 173 174 spin_lock_irqsave(&iounit->lock, flags); 175 while (sz != 0) { 176 --sz; 177 len = ((sg->dvma_address & ~PAGE_MASK) + sg->length + (PAGE_SIZE-1)) >> PAGE_SHIFT; 178 vaddr = (sg->dvma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT; 179 IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr)); 180 for (len += vaddr; vaddr < len; vaddr++) 181 clear_bit(vaddr, iounit->bmap); 182 sg = sg_next(sg); 183 } 184 spin_unlock_irqrestore(&iounit->lock, flags); 185 } 186 187 #ifdef CONFIG_SBUS 188 static int iounit_map_dma_area(dma_addr_t *pba, unsigned long va, __u32 addr, int len) 189 { 190 unsigned long page, end; 191 pgprot_t dvma_prot; 192 iopte_t *iopte; 193 struct sbus_bus *sbus; 194 195 *pba = addr; 196 197 dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV); 198 end = PAGE_ALIGN((addr + len)); 199 while(addr < end) { 200 page = va; 201 { 202 pgd_t *pgdp; 203 pmd_t *pmdp; 204 pte_t *ptep; 205 long i; 206 207 pgdp = pgd_offset(&init_mm, addr); 208 pmdp = pmd_offset(pgdp, addr); 209 ptep = pte_offset_map(pmdp, addr); 210 211 set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot)); 212 213 i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT); 214 215 for_each_sbus(sbus) { 216 struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu; 217 218 iopte = (iopte_t *)(iounit->page_table + i); 219 *iopte = MKIOPTE(__pa(page)); 220 } 221 } 222 addr += PAGE_SIZE; 223 va += PAGE_SIZE; 224 } 225 flush_cache_all(); 226 flush_tlb_all(); 227 228 return 0; 229 } 230 231 static void iounit_unmap_dma_area(unsigned long addr, int len) 232 { 233 /* XXX Somebody please fill this in */ 234 } 235 236 /* XXX We do not pass sbus device here, bad. */ 237 static struct page *iounit_translate_dvma(unsigned long addr) 238 { 239 struct sbus_bus *sbus = sbus_root; /* They are all the same */ 240 struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu; 241 int i; 242 iopte_t *iopte; 243 244 i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT); 245 iopte = (iopte_t *)(iounit->page_table + i); 246 return pfn_to_page(iopte_val(*iopte) >> (PAGE_SHIFT-4)); /* XXX sun4d guru, help */ 247 } 248 #endif 249 250 static char *iounit_lockarea(char *vaddr, unsigned long len) 251 { 252 /* FIXME: Write this */ 253 return vaddr; 254 } 255 256 static void iounit_unlockarea(char *vaddr, unsigned long len) 257 { 258 /* FIXME: Write this */ 259 } 260 261 void __init ld_mmu_iounit(void) 262 { 263 BTFIXUPSET_CALL(mmu_lockarea, iounit_lockarea, BTFIXUPCALL_RETO0); 264 BTFIXUPSET_CALL(mmu_unlockarea, iounit_unlockarea, BTFIXUPCALL_NOP); 265 266 BTFIXUPSET_CALL(mmu_get_scsi_one, iounit_get_scsi_one, BTFIXUPCALL_NORM); 267 BTFIXUPSET_CALL(mmu_get_scsi_sgl, iounit_get_scsi_sgl, BTFIXUPCALL_NORM); 268 BTFIXUPSET_CALL(mmu_release_scsi_one, iounit_release_scsi_one, BTFIXUPCALL_NORM); 269 BTFIXUPSET_CALL(mmu_release_scsi_sgl, iounit_release_scsi_sgl, BTFIXUPCALL_NORM); 270 271 #ifdef CONFIG_SBUS 272 BTFIXUPSET_CALL(mmu_map_dma_area, iounit_map_dma_area, BTFIXUPCALL_NORM); 273 BTFIXUPSET_CALL(mmu_unmap_dma_area, iounit_unmap_dma_area, BTFIXUPCALL_NORM); 274 BTFIXUPSET_CALL(mmu_translate_dvma, iounit_translate_dvma, BTFIXUPCALL_NORM); 275 #endif 276 } 277 278 __u32 iounit_map_dma_init(struct sbus_bus *sbus, int size) 279 { 280 int i, j, k, npages; 281 unsigned long rotor, scan, limit; 282 unsigned long flags; 283 __u32 ret; 284 struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu; 285 286 npages = (size + (PAGE_SIZE-1)) >> PAGE_SHIFT; 287 i = 0x0213; 288 spin_lock_irqsave(&iounit->lock, flags); 289 next: j = (i & 15); 290 rotor = iounit->rotor[j - 1]; 291 limit = iounit->limit[j]; 292 scan = rotor; 293 nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan); 294 if (scan + npages > limit) { 295 if (limit != rotor) { 296 limit = rotor; 297 scan = iounit->limit[j - 1]; 298 goto nexti; 299 } 300 i >>= 4; 301 if (!(i & 15)) 302 panic("iounit_map_dma_init: Couldn't find free iopte slots for %d bytes\n", size); 303 goto next; 304 } 305 for (k = 1, scan++; k < npages; k++) 306 if (test_bit(scan++, iounit->bmap)) 307 goto nexti; 308 iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1]; 309 scan -= npages; 310 ret = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT); 311 for (k = 0; k < npages; k++, scan++) 312 set_bit(scan, iounit->bmap); 313 spin_unlock_irqrestore(&iounit->lock, flags); 314 return ret; 315 } 316 317 __u32 iounit_map_dma_page(__u32 vaddr, void *addr, struct sbus_bus *sbus) 318 { 319 int scan = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT; 320 struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu; 321 322 iounit->page_table[scan] = MKIOPTE(__pa(((unsigned long)addr) & PAGE_MASK)); 323 return vaddr + (((unsigned long)addr) & ~PAGE_MASK); 324 } 325