1/* $Id: io-unit.c,v 1.1.1.1 2007/08/03 18:52:18 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/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 15#include <asm/scatterlist.h> 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 37void __init 38iounit_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->iommu = (struct iommu_struct *)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 */ 79static 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 96next: j = (i & 15); 97 rotor = iounit->rotor[j - 1]; 98 limit = iounit->limit[j]; 99 scan = rotor; 100nexti: 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 127static __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 = (struct iounit_struct *)sbus->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 138static void iounit_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus) 139{ 140 unsigned long flags; 141 struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; 142 143 spin_lock_irqsave(&iounit->lock, flags); 144 while (sz != 0) { 145 --sz; 146 sg[sz].dvma_address = iounit_get_area(iounit, (unsigned long)page_address(sg[sz].page) + sg[sz].offset, sg[sz].length); 147 sg[sz].dvma_length = sg[sz].length; 148 } 149 spin_unlock_irqrestore(&iounit->lock, flags); 150} 151 152static void iounit_release_scsi_one(__u32 vaddr, unsigned long len, struct sbus_bus *sbus) 153{ 154 unsigned long flags; 155 struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; 156 157 spin_lock_irqsave(&iounit->lock, flags); 158 len = ((vaddr & ~PAGE_MASK) + len + (PAGE_SIZE-1)) >> PAGE_SHIFT; 159 vaddr = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT; 160 IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr)); 161 for (len += vaddr; vaddr < len; vaddr++) 162 clear_bit(vaddr, iounit->bmap); 163 spin_unlock_irqrestore(&iounit->lock, flags); 164} 165 166static void iounit_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus) 167{ 168 unsigned long flags; 169 unsigned long vaddr, len; 170 struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; 171 172 spin_lock_irqsave(&iounit->lock, flags); 173 while (sz != 0) { 174 --sz; 175 len = ((sg[sz].dvma_address & ~PAGE_MASK) + sg[sz].length + (PAGE_SIZE-1)) >> PAGE_SHIFT; 176 vaddr = (sg[sz].dvma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT; 177 IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr)); 178 for (len += vaddr; vaddr < len; vaddr++) 179 clear_bit(vaddr, iounit->bmap); 180 } 181 spin_unlock_irqrestore(&iounit->lock, flags); 182} 183 184#ifdef CONFIG_SBUS 185static int iounit_map_dma_area(dma_addr_t *pba, unsigned long va, __u32 addr, int len) 186{ 187 unsigned long page, end; 188 pgprot_t dvma_prot; 189 iopte_t *iopte; 190 struct sbus_bus *sbus; 191 192 *pba = addr; 193 194 dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV); 195 end = PAGE_ALIGN((addr + len)); 196 while(addr < end) { 197 page = va; 198 { 199 pgd_t *pgdp; 200 pmd_t *pmdp; 201 pte_t *ptep; 202 long i; 203 204 pgdp = pgd_offset(&init_mm, addr); 205 pmdp = pmd_offset(pgdp, addr); 206 ptep = pte_offset_map(pmdp, addr); 207 208 set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot)); 209 210 i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT); 211 212 for_each_sbus(sbus) { 213 struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; 214 215 iopte = (iopte_t *)(iounit->page_table + i); 216 *iopte = MKIOPTE(__pa(page)); 217 } 218 } 219 addr += PAGE_SIZE; 220 va += PAGE_SIZE; 221 } 222 flush_cache_all(); 223 flush_tlb_all(); 224 225 return 0; 226} 227 228static void iounit_unmap_dma_area(unsigned long addr, int len) 229{ 230} 231 232static struct page *iounit_translate_dvma(unsigned long addr) 233{ 234 struct sbus_bus *sbus = sbus_root; /* They are all the same */ 235 struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; 236 int i; 237 iopte_t *iopte; 238 239 i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT); 240 iopte = (iopte_t *)(iounit->page_table + i); 241 return pfn_to_page(iopte_val(*iopte) >> (PAGE_SHIFT-4)); 242} 243#endif 244 245static char *iounit_lockarea(char *vaddr, unsigned long len) 246{ 247 return vaddr; 248} 249 250static void iounit_unlockarea(char *vaddr, unsigned long len) 251{ 252} 253 254void __init ld_mmu_iounit(void) 255{ 256 BTFIXUPSET_CALL(mmu_lockarea, iounit_lockarea, BTFIXUPCALL_RETO0); 257 BTFIXUPSET_CALL(mmu_unlockarea, iounit_unlockarea, BTFIXUPCALL_NOP); 258 259 BTFIXUPSET_CALL(mmu_get_scsi_one, iounit_get_scsi_one, BTFIXUPCALL_NORM); 260 BTFIXUPSET_CALL(mmu_get_scsi_sgl, iounit_get_scsi_sgl, BTFIXUPCALL_NORM); 261 BTFIXUPSET_CALL(mmu_release_scsi_one, iounit_release_scsi_one, BTFIXUPCALL_NORM); 262 BTFIXUPSET_CALL(mmu_release_scsi_sgl, iounit_release_scsi_sgl, BTFIXUPCALL_NORM); 263 264#ifdef CONFIG_SBUS 265 BTFIXUPSET_CALL(mmu_map_dma_area, iounit_map_dma_area, BTFIXUPCALL_NORM); 266 BTFIXUPSET_CALL(mmu_unmap_dma_area, iounit_unmap_dma_area, BTFIXUPCALL_NORM); 267 BTFIXUPSET_CALL(mmu_translate_dvma, iounit_translate_dvma, BTFIXUPCALL_NORM); 268#endif 269} 270 271__u32 iounit_map_dma_init(struct sbus_bus *sbus, int size) 272{ 273 int i, j, k, npages; 274 unsigned long rotor, scan, limit; 275 unsigned long flags; 276 __u32 ret; 277 struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; 278 279 npages = (size + (PAGE_SIZE-1)) >> PAGE_SHIFT; 280 i = 0x0213; 281 spin_lock_irqsave(&iounit->lock, flags); 282next: j = (i & 15); 283 rotor = iounit->rotor[j - 1]; 284 limit = iounit->limit[j]; 285 scan = rotor; 286nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan); 287 if (scan + npages > limit) { 288 if (limit != rotor) { 289 limit = rotor; 290 scan = iounit->limit[j - 1]; 291 goto nexti; 292 } 293 i >>= 4; 294 if (!(i & 15)) 295 panic("iounit_map_dma_init: Couldn't find free iopte slots for %d bytes\n", size); 296 goto next; 297 } 298 for (k = 1, scan++; k < npages; k++) 299 if (test_bit(scan++, iounit->bmap)) 300 goto nexti; 301 iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1]; 302 scan -= npages; 303 ret = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT); 304 for (k = 0; k < npages; k++, scan++) 305 set_bit(scan, iounit->bmap); 306 spin_unlock_irqrestore(&iounit->lock, flags); 307 return ret; 308} 309 310__u32 iounit_map_dma_page(__u32 vaddr, void *addr, struct sbus_bus *sbus) 311{ 312 int scan = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT; 313 struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu; 314 315 iounit->page_table[scan] = MKIOPTE(__pa(((unsigned long)addr) & PAGE_MASK)); 316 return vaddr + (((unsigned long)addr) & ~PAGE_MASK); 317} 318