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xianfeng |
/* $Id: io-unit.c,v 1.24 2001/12/17 07:05:09 davem Exp $
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* io-unit.c: IO-UNIT specific routines for memory management.
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*
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* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/mm.h>
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#include <linux/highmem.h> /* pte_offset_map => kmap_atomic */
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#include <linux/bitops.h>
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#include <linux/scatterlist.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/sbus.h>
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#include <asm/io.h>
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#include <asm/io-unit.h>
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#include <asm/mxcc.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <asm/dma.h>
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#include <asm/oplib.h>
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/* #define IOUNIT_DEBUG */
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#ifdef IOUNIT_DEBUG
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#define IOD(x) printk(x)
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#else
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#define IOD(x) do { } while (0)
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#endif
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#define IOPERM (IOUPTE_CACHE | IOUPTE_WRITE | IOUPTE_VALID)
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#define MKIOPTE(phys) __iopte((((phys)>>4) & IOUPTE_PAGE) | IOPERM)
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void __init
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iounit_init(int sbi_node, int io_node, struct sbus_bus *sbus)
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{
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iopte_t *xpt, *xptend;
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struct iounit_struct *iounit;
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struct linux_prom_registers iommu_promregs[PROMREG_MAX];
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struct resource r;
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iounit = kzalloc(sizeof(struct iounit_struct), GFP_ATOMIC);
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if (!iounit) {
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prom_printf("SUN4D: Cannot alloc iounit, halting.\n");
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prom_halt();
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}
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iounit->limit[0] = IOUNIT_BMAP1_START;
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iounit->limit[1] = IOUNIT_BMAP2_START;
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iounit->limit[2] = IOUNIT_BMAPM_START;
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iounit->limit[3] = IOUNIT_BMAPM_END;
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iounit->rotor[1] = IOUNIT_BMAP2_START;
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iounit->rotor[2] = IOUNIT_BMAPM_START;
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xpt = NULL;
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if(prom_getproperty(sbi_node, "reg", (void *) iommu_promregs,
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sizeof(iommu_promregs)) != -1) {
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prom_apply_generic_ranges(io_node, 0, iommu_promregs, 3);
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memset(&r, 0, sizeof(r));
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r.flags = iommu_promregs[2].which_io;
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r.start = iommu_promregs[2].phys_addr;
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xpt = (iopte_t *) sbus_ioremap(&r, 0, PAGE_SIZE * 16, "XPT");
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}
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if(!xpt) panic("Cannot map External Page Table.");
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sbus->ofdev.dev.archdata.iommu = iounit;
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iounit->page_table = xpt;
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spin_lock_init(&iounit->lock);
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for (xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t);
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xpt < xptend;)
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iopte_val(*xpt++) = 0;
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}
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/* One has to hold iounit->lock to call this */
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static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long vaddr, int size)
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{
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int i, j, k, npages;
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unsigned long rotor, scan, limit;
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iopte_t iopte;
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npages = ((vaddr & ~PAGE_MASK) + size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
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/* A tiny bit of magic ingredience :) */
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switch (npages) {
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case 1: i = 0x0231; break;
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case 2: i = 0x0132; break;
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default: i = 0x0213; break;
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}
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IOD(("iounit_get_area(%08lx,%d[%d])=", vaddr, size, npages));
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next: j = (i & 15);
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rotor = iounit->rotor[j - 1];
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limit = iounit->limit[j];
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scan = rotor;
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nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan);
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if (scan + npages > limit) {
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if (limit != rotor) {
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limit = rotor;
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scan = iounit->limit[j - 1];
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goto nexti;
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}
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i >>= 4;
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if (!(i & 15))
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panic("iounit_get_area: Couldn't find free iopte slots for (%08lx,%d)\n", vaddr, size);
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goto next;
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}
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for (k = 1, scan++; k < npages; k++)
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if (test_bit(scan++, iounit->bmap))
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goto nexti;
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iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1];
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scan -= npages;
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iopte = MKIOPTE(__pa(vaddr & PAGE_MASK));
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vaddr = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + (vaddr & ~PAGE_MASK);
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for (k = 0; k < npages; k++, iopte = __iopte(iopte_val(iopte) + 0x100), scan++) {
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set_bit(scan, iounit->bmap);
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iounit->page_table[scan] = iopte;
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}
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IOD(("%08lx\n", vaddr));
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return vaddr;
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}
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static __u32 iounit_get_scsi_one(char *vaddr, unsigned long len, struct sbus_bus *sbus)
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{
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unsigned long ret, flags;
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struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu;
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spin_lock_irqsave(&iounit->lock, flags);
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ret = iounit_get_area(iounit, (unsigned long)vaddr, len);
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spin_unlock_irqrestore(&iounit->lock, flags);
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return ret;
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}
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static void iounit_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
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{
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unsigned long flags;
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struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu;
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/* FIXME: Cache some resolved pages - often several sg entries are to the same page */
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spin_lock_irqsave(&iounit->lock, flags);
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while (sz != 0) {
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--sz;
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sg->dvma_address = iounit_get_area(iounit, (unsigned long) sg_virt(sg), sg->length);
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sg->dvma_length = sg->length;
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sg = sg_next(sg);
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}
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spin_unlock_irqrestore(&iounit->lock, flags);
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}
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static void iounit_release_scsi_one(__u32 vaddr, unsigned long len, struct sbus_bus *sbus)
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{
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unsigned long flags;
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struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu;
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spin_lock_irqsave(&iounit->lock, flags);
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len = ((vaddr & ~PAGE_MASK) + len + (PAGE_SIZE-1)) >> PAGE_SHIFT;
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vaddr = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
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IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
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for (len += vaddr; vaddr < len; vaddr++)
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clear_bit(vaddr, iounit->bmap);
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spin_unlock_irqrestore(&iounit->lock, flags);
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}
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static void iounit_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
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{
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unsigned long flags;
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unsigned long vaddr, len;
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struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu;
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| 174 |
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spin_lock_irqsave(&iounit->lock, flags);
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while (sz != 0) {
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--sz;
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len = ((sg->dvma_address & ~PAGE_MASK) + sg->length + (PAGE_SIZE-1)) >> PAGE_SHIFT;
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vaddr = (sg->dvma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
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IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
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| 180 |
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for (len += vaddr; vaddr < len; vaddr++)
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clear_bit(vaddr, iounit->bmap);
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| 182 |
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sg = sg_next(sg);
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| 183 |
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}
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| 184 |
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spin_unlock_irqrestore(&iounit->lock, flags);
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| 185 |
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}
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| 186 |
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| 187 |
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#ifdef CONFIG_SBUS
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static int iounit_map_dma_area(dma_addr_t *pba, unsigned long va, __u32 addr, int len)
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{
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| 190 |
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unsigned long page, end;
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| 191 |
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pgprot_t dvma_prot;
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| 192 |
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iopte_t *iopte;
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| 193 |
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struct sbus_bus *sbus;
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| 194 |
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| 195 |
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*pba = addr;
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| 196 |
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| 197 |
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dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV);
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| 198 |
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end = PAGE_ALIGN((addr + len));
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| 199 |
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while(addr < end) {
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| 200 |
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page = va;
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| 201 |
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{
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| 202 |
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pgd_t *pgdp;
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| 203 |
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pmd_t *pmdp;
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| 204 |
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pte_t *ptep;
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| 205 |
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long i;
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| 206 |
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| 207 |
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pgdp = pgd_offset(&init_mm, addr);
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| 208 |
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pmdp = pmd_offset(pgdp, addr);
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| 209 |
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ptep = pte_offset_map(pmdp, addr);
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| 210 |
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| 211 |
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set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot));
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| 212 |
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| 213 |
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i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
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| 214 |
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| 215 |
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for_each_sbus(sbus) {
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| 216 |
|
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struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu;
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| 217 |
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| 218 |
|
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iopte = (iopte_t *)(iounit->page_table + i);
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| 219 |
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*iopte = MKIOPTE(__pa(page));
|
| 220 |
|
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}
|
| 221 |
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}
|
| 222 |
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addr += PAGE_SIZE;
|
| 223 |
|
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va += PAGE_SIZE;
|
| 224 |
|
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}
|
| 225 |
|
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flush_cache_all();
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| 226 |
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flush_tlb_all();
|
| 227 |
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| 228 |
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return 0;
|
| 229 |
|
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}
|
| 230 |
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| 231 |
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static void iounit_unmap_dma_area(unsigned long addr, int len)
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| 232 |
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{
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| 233 |
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/* XXX Somebody please fill this in */
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| 234 |
|
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}
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| 235 |
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| 236 |
|
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/* XXX We do not pass sbus device here, bad. */
|
| 237 |
|
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static struct page *iounit_translate_dvma(unsigned long addr)
|
| 238 |
|
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{
|
| 239 |
|
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struct sbus_bus *sbus = sbus_root; /* They are all the same */
|
| 240 |
|
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struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu;
|
| 241 |
|
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int i;
|
| 242 |
|
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iopte_t *iopte;
|
| 243 |
|
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|
| 244 |
|
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i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
|
| 245 |
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iopte = (iopte_t *)(iounit->page_table + i);
|
| 246 |
|
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return pfn_to_page(iopte_val(*iopte) >> (PAGE_SHIFT-4)); /* XXX sun4d guru, help */
|
| 247 |
|
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}
|
| 248 |
|
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#endif
|
| 249 |
|
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|
| 250 |
|
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static char *iounit_lockarea(char *vaddr, unsigned long len)
|
| 251 |
|
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{
|
| 252 |
|
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/* FIXME: Write this */
|
| 253 |
|
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return vaddr;
|
| 254 |
|
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}
|
| 255 |
|
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|
| 256 |
|
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static void iounit_unlockarea(char *vaddr, unsigned long len)
|
| 257 |
|
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{
|
| 258 |
|
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/* FIXME: Write this */
|
| 259 |
|
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}
|
| 260 |
|
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|
| 261 |
|
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void __init ld_mmu_iounit(void)
|
| 262 |
|
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{
|
| 263 |
|
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BTFIXUPSET_CALL(mmu_lockarea, iounit_lockarea, BTFIXUPCALL_RETO0);
|
| 264 |
|
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BTFIXUPSET_CALL(mmu_unlockarea, iounit_unlockarea, BTFIXUPCALL_NOP);
|
| 265 |
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|
| 266 |
|
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BTFIXUPSET_CALL(mmu_get_scsi_one, iounit_get_scsi_one, BTFIXUPCALL_NORM);
|
| 267 |
|
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BTFIXUPSET_CALL(mmu_get_scsi_sgl, iounit_get_scsi_sgl, BTFIXUPCALL_NORM);
|
| 268 |
|
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BTFIXUPSET_CALL(mmu_release_scsi_one, iounit_release_scsi_one, BTFIXUPCALL_NORM);
|
| 269 |
|
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BTFIXUPSET_CALL(mmu_release_scsi_sgl, iounit_release_scsi_sgl, BTFIXUPCALL_NORM);
|
| 270 |
|
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|
| 271 |
|
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#ifdef CONFIG_SBUS
|
| 272 |
|
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BTFIXUPSET_CALL(mmu_map_dma_area, iounit_map_dma_area, BTFIXUPCALL_NORM);
|
| 273 |
|
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BTFIXUPSET_CALL(mmu_unmap_dma_area, iounit_unmap_dma_area, BTFIXUPCALL_NORM);
|
| 274 |
|
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BTFIXUPSET_CALL(mmu_translate_dvma, iounit_translate_dvma, BTFIXUPCALL_NORM);
|
| 275 |
|
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#endif
|
| 276 |
|
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}
|
| 277 |
|
|
|
| 278 |
|
|
__u32 iounit_map_dma_init(struct sbus_bus *sbus, int size)
|
| 279 |
|
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{
|
| 280 |
|
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int i, j, k, npages;
|
| 281 |
|
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unsigned long rotor, scan, limit;
|
| 282 |
|
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unsigned long flags;
|
| 283 |
|
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__u32 ret;
|
| 284 |
|
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struct iounit_struct *iounit = sbus->ofdev.dev.archdata.iommu;
|
| 285 |
|
|
|
| 286 |
|
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npages = (size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
|
| 287 |
|
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i = 0x0213;
|
| 288 |
|
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spin_lock_irqsave(&iounit->lock, flags);
|
| 289 |
|
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next: j = (i & 15);
|
| 290 |
|
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rotor = iounit->rotor[j - 1];
|
| 291 |
|
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limit = iounit->limit[j];
|
| 292 |
|
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scan = rotor;
|
| 293 |
|
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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 |
|
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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 |
|
|
}
|
