arch/sparc/mm/io-unit.c

   1 /* $Id: io-unit.c,v 1.22 2000/08/09 00:00:15 davem Exp $
   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/config.h>
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <linux/malloc.h>
  11 #include <linux/spinlock.h>
  12 #include <asm/scatterlist.h>
  13 #include <asm/pgalloc.h>
  14 #include <asm/pgtable.h>
  15 #include <asm/sbus.h>
  16 #include <asm/io.h>
  17 #include <asm/io-unit.h>
  18 #include <asm/mxcc.h>
  19 #include <asm/bitops.h>
  20
  21 /* #define IOUNIT_DEBUG */
  22 #ifdef IOUNIT_DEBUG
  23 #define IOD(x) printk(x)
  24 #else
  25 #define IOD(x) do { } while (0)
  26 #endif
  27
  28 #define IOPERM        (IOUPTE_CACHE | IOUPTE_WRITE | IOUPTE_VALID)
  29 #define MKIOPTE(phys) __iopte((((phys)>>4) & IOUPTE_PAGE) | IOPERM)
  30
  31 void __init
  32 iounit_init(int sbi_node, int io_node, struct sbus_bus *sbus)
  33 {
  34         iopte_t *xpt, *xptend;
  35         struct iounit_struct *iounit;
  36         struct linux_prom_registers iommu_promregs[PROMREG_MAX];
  37         struct resource r;
  38
  39         iounit = kmalloc(sizeof(struct iounit_struct), GFP_ATOMIC);
  40
  41         memset(iounit, 0, sizeof(*iounit));
  42         iounit->limit[0] = IOUNIT_BMAP1_START;
  43         iounit->limit[1] = IOUNIT_BMAP2_START;
  44         iounit->limit[2] = IOUNIT_BMAPM_START;
  45         iounit->limit[3] = IOUNIT_BMAPM_END;
  46         iounit->rotor[1] = IOUNIT_BMAP2_START;
  47         iounit->rotor[2] = IOUNIT_BMAPM_START;
  48
  49         prom_getproperty(sbi_node, "reg", (void *) iommu_promregs,
  50                          sizeof(iommu_promregs));
  51         prom_apply_generic_ranges(io_node, 0, iommu_promregs, 3);
  52         memset(&r, 0, sizeof(r));
  53         r.flags = iommu_promregs[2].which_io;
  54         r.start = iommu_promregs[2].phys_addr;
  55         xpt = (iopte_t *) sbus_ioremap(&r, 0, PAGE_SIZE * 16, "XPT");
  56         if(!xpt) panic("Cannot map External Page Table.");
  57
  58         sbus->iommu = (struct iommu_struct *)iounit;
  59         iounit->page_table = xpt;
  60
  61         for (xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t);
  62              xpt < xptend;)
  63                 *xpt++ = 0;
  64 }
  65
  66 /* One has to hold iounit->lock to call this */
  67 static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long vaddr, int size)
  68 {
  69         int i, j, k, npages;
  70         unsigned long rotor, scan, limit;
  71         iopte_t iopte;
  72
  73         npages = ((vaddr & ~PAGE_MASK) + size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
  74
  75         /* A tiny bit of magic ingredience :) */
  76         switch (npages) {
  77         case 1: i = 0x0231; break;
  78         case 2: i = 0x0132; break;
  79         default: i = 0x0213; break;
  80         }
  81
  82         IOD(("iounit_get_area(%08lx,%d[%d])=", vaddr, size, npages));
  83
  84 next:   j = (i & 15);
  85         rotor = iounit->rotor[j - 1];
  86         limit = iounit->limit[j];
  87         scan = rotor;
  88 nexti:  scan = find_next_zero_bit(iounit->bmap, limit, scan);
  89         if (scan + npages > limit) {
  90                 if (limit != rotor) {
  91                         limit = rotor;
  92                         scan = iounit->limit[j - 1];
  93                         goto nexti;
  94                 }
  95                 i >>= 4;
  96                 if (!(i & 15))
  97                         panic("iounit_get_area: Couldn't find free iopte slots for (%08lx,%d)\n", vaddr, size);
  98                 goto next;
  99         }
 100         for (k = 1, scan++; k < npages; k++)
 101                 if (test_bit(scan++, iounit->bmap))
 102                         goto nexti;
 103         iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1];
 104         scan -= npages;
 105         iopte = MKIOPTE(__pa(vaddr & PAGE_MASK));
 106         vaddr = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + (vaddr & ~PAGE_MASK);
 107         for (k = 0; k < npages; k++, iopte = __iopte(iopte_val(iopte) + 0x100), scan++) {
 108                 set_bit(scan, iounit->bmap);
 109                 iounit->page_table[scan] = iopte;
 110         }
 111         IOD(("%08lx\n", vaddr));
 112         return vaddr;
 113 }
 114
 115 static __u32 iounit_get_scsi_one(char *vaddr, unsigned long len, struct sbus_bus *sbus)
 116 {
 117         unsigned long ret, flags;
 118         struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
 119
 120         spin_lock_irqsave(&iounit->lock, flags);
 121         ret = iounit_get_area(iounit, (unsigned long)vaddr, len);
 122         spin_unlock_irqrestore(&iounit->lock, flags);
 123         return ret;
 124 }
 125
 126 static void iounit_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
 127 {
 128         unsigned long flags;
 129         struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
 130
 131         /* FIXME: Cache some resolved pages - often several sg entries are to the same page */
 132         spin_lock_irqsave(&iounit->lock, flags);
 133         for (; sz >= 0; sz--) {
 134                 sg[sz].dvma_address = iounit_get_area(iounit, (unsigned long)sg[sz].address, sg[sz].length);
 135                 sg[sz].dvma_length = sg[sz].length;
 136         }
 137         spin_unlock_irqrestore(&iounit->lock, flags);
 138 }
 139
 140 static void iounit_release_scsi_one(__u32 vaddr, unsigned long len, struct sbus_bus *sbus)
 141 {
 142         unsigned long flags;
 143         struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
 144
 145         spin_lock_irqsave(&iounit->lock, flags);
 146         len = ((vaddr & ~PAGE_MASK) + len + (PAGE_SIZE-1)) >> PAGE_SHIFT;
 147         vaddr = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
 148         IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
 149         for (len += vaddr; vaddr < len; vaddr++)
 150                 clear_bit(vaddr, iounit->bmap);
 151         spin_unlock_irqrestore(&iounit->lock, flags);
 152 }
 153
 154 static void iounit_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
 155 {
 156         unsigned long flags;
 157         unsigned long vaddr, len;
 158         struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
 159
 160         spin_lock_irqsave(&iounit->lock, flags);
 161         for (; sz >= 0; sz--) {
 162                 len = ((sg[sz].dvma_address & ~PAGE_MASK) + sg[sz].length + (PAGE_SIZE-1)) >> PAGE_SHIFT;
 163                 vaddr = (sg[sz].dvma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
 164                 IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
 165                 for (len += vaddr; vaddr < len; vaddr++)
 166                         clear_bit(vaddr, iounit->bmap);
 167         }
 168         spin_unlock_irqrestore(&iounit->lock, flags);
 169 }
 170
 171 #ifdef CONFIG_SBUS
 172 static void iounit_map_dma_area(unsigned long va, __u32 addr, int len)
 173 {
 174         unsigned long page, end;
 175         pgprot_t dvma_prot;
 176         iopte_t *iopte;
 177         struct sbus_bus *sbus;
 178
 179         dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV);
 180         end = PAGE_ALIGN((addr + len));
 181         while(addr < end) {
 182                 page = va;
 183                 {
 184                         pgd_t *pgdp;
 185                         pmd_t *pmdp;
 186                         pte_t *ptep;
 187                         long i;
 188
 189                         pgdp = pgd_offset(init_task.mm, addr);
 190                         pmdp = pmd_offset(pgdp, addr);
 191                         ptep = pte_offset(pmdp, addr);
 192
 193                         set_pte(ptep, pte_val(mk_pte(virt_to_page(page), dvma_prot)));
 194
 195                         i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
 196
 197                         for_each_sbus(sbus) {
 198                                 struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
 199
 200                                 iopte = (iopte_t *)(iounit->page_table + i);
 201                                 *iopte = __iopte(MKIOPTE(__pa(page)));
 202                         }
 203                 }
 204                 addr += PAGE_SIZE;
 205                 va += PAGE_SIZE;
 206         }
 207         flush_cache_all();
 208         flush_tlb_all();
 209 }
 210
 211 static void iounit_unmap_dma_area(unsigned long addr, int len)
 212 {
 213         /* XXX Somebody please fill this in */
 214 }
 215
 216 /* XXX We do not pass sbus device here, bad. */
 217 static unsigned long iounit_translate_dvma(unsigned long addr)
 218 {
 219         struct sbus_bus *sbus = sbus_root;      /* They are all the same */
 220         struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
 221         int i;
 222         iopte_t *iopte;
 223
 224         i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
 225         iopte = (iopte_t *)(iounit->page_table + i);
 226         return (iopte_val(*iopte) & 0xFFFFFFF0) << 4; /* XXX sun4d guru, help */
 227 }
 228 #endif
 229
 230 static char *iounit_lockarea(char *vaddr, unsigned long len)
 231 {
 232 /* FIXME: Write this */
 233         return vaddr;
 234 }
 235
 236 static void iounit_unlockarea(char *vaddr, unsigned long len)
 237 {
 238 /* FIXME: Write this */
 239 }
 240
 241 void __init ld_mmu_iounit(void)
 242 {
 243         BTFIXUPSET_CALL(mmu_lockarea, iounit_lockarea, BTFIXUPCALL_RETO0);
 244         BTFIXUPSET_CALL(mmu_unlockarea, iounit_unlockarea, BTFIXUPCALL_NOP);
 245
 246         BTFIXUPSET_CALL(mmu_get_scsi_one, iounit_get_scsi_one, BTFIXUPCALL_NORM);
 247         BTFIXUPSET_CALL(mmu_get_scsi_sgl, iounit_get_scsi_sgl, BTFIXUPCALL_NORM);
 248         BTFIXUPSET_CALL(mmu_release_scsi_one, iounit_release_scsi_one, BTFIXUPCALL_NORM);
 249         BTFIXUPSET_CALL(mmu_release_scsi_sgl, iounit_release_scsi_sgl, BTFIXUPCALL_NORM);
 250
 251 #ifdef CONFIG_SBUS
 252         BTFIXUPSET_CALL(mmu_map_dma_area, iounit_map_dma_area, BTFIXUPCALL_NORM);
 253         BTFIXUPSET_CALL(mmu_unmap_dma_area, iounit_unmap_dma_area, BTFIXUPCALL_NORM);
 254         BTFIXUPSET_CALL(mmu_translate_dvma, iounit_translate_dvma, BTFIXUPCALL_NORM);
 255 #endif
 256 }
 257
 258 __u32 iounit_map_dma_init(struct sbus_bus *sbus, int size)
 259 {
 260         int i, j, k, npages;
 261         unsigned long rotor, scan, limit;
 262         unsigned long flags;
 263         __u32 ret;
 264         struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
 265
 266         npages = (size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
 267         i = 0x0213;
 268         spin_lock_irqsave(&iounit->lock, flags);
 269 next:   j = (i & 15);
 270         rotor = iounit->rotor[j - 1];
 271         limit = iounit->limit[j];
 272         scan = rotor;
 273 nexti:  scan = find_next_zero_bit(iounit->bmap, limit, scan);
 274         if (scan + npages > limit) {
 275                 if (limit != rotor) {
 276                         limit = rotor;
 277                         scan = iounit->limit[j - 1];
 278                         goto nexti;
 279                 }
 280                 i >>= 4;
 281                 if (!(i & 15))
 282                         panic("iounit_map_dma_init: Couldn't find free iopte slots for %d bytes\n", size);
 283                 goto next;
 284         }
 285         for (k = 1, scan++; k < npages; k++)
 286                 if (test_bit(scan++, iounit->bmap))
 287                         goto nexti;
 288         iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1];
 289         scan -= npages;
 290         ret = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT);
 291         for (k = 0; k < npages; k++, scan++)
 292                 set_bit(scan, iounit->bmap);
 293         spin_unlock_irqrestore(&iounit->lock, flags);
 294         return ret;
 295 }
 296
 297 __u32 iounit_map_dma_page(__u32 vaddr, void *addr, struct sbus_bus *sbus)
 298 {
 299         int scan = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
 300         struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
 301
 302         iounit->page_table[scan] = MKIOPTE(__pa(((unsigned long)addr) & PAGE_MASK));
 303         return vaddr + (((unsigned long)addr) & ~PAGE_MASK);
 304 }