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d894d964ff
This set of changes displays one major danger of btfixup, interface signatures are not always type checked fully. As seen here the iounit variant of the map_dma_area routine had an incorrect type for one of it's arguments. It turns out to be harmless in this case, but just imagine trying to debug something involving this kind of problem. No thanks. Signed-off-by: David S. Miller <davem@davemloft.net>
260 lines
6.8 KiB
C
260 lines
6.8 KiB
C
/*
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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 <linux/of.h>
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#include <linux/of_device.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.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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static void __init iounit_iommu_init(struct platform_device *op)
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{
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struct iounit_struct *iounit;
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iopte_t *xpt, *xptend;
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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 = of_ioremap(&op->resource[2], 0, PAGE_SIZE * 16, "XPT");
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if (!xpt) {
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prom_printf("SUN4D: Cannot map External Page Table.");
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prom_halt();
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}
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op->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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static int __init iounit_init(void)
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{
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extern void sun4d_init_sbi_irq(void);
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struct device_node *dp;
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for_each_node_by_name(dp, "sbi") {
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struct platform_device *op = of_find_device_by_node(dp);
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iounit_iommu_init(op);
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of_propagate_archdata(op);
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}
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sun4d_init_sbi_irq();
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return 0;
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}
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subsys_initcall(iounit_init);
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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(struct device *dev, char *vaddr, unsigned long len)
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{
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struct iounit_struct *iounit = dev->archdata.iommu;
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unsigned long ret, flags;
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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 device *dev, struct scatterlist *sg, int sz)
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{
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struct iounit_struct *iounit = dev->archdata.iommu;
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unsigned long flags;
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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->dma_address = iounit_get_area(iounit, (unsigned long) sg_virt(sg), sg->length);
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sg->dma_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(struct device *dev, __u32 vaddr, unsigned long len)
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{
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struct iounit_struct *iounit = dev->archdata.iommu;
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unsigned long flags;
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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 device *dev, struct scatterlist *sg, int sz)
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{
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struct iounit_struct *iounit = dev->archdata.iommu;
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unsigned long flags;
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unsigned long vaddr, len;
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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->dma_address & ~PAGE_MASK) + sg->length + (PAGE_SIZE-1)) >> PAGE_SHIFT;
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vaddr = (sg->dma_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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for (len += vaddr; vaddr < len; vaddr++)
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clear_bit(vaddr, iounit->bmap);
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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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#ifdef CONFIG_SBUS
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static int iounit_map_dma_area(struct device *dev, dma_addr_t *pba, unsigned long va, unsigned long addr, int len)
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{
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struct iounit_struct *iounit = dev->archdata.iommu;
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unsigned long page, end;
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pgprot_t dvma_prot;
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iopte_t *iopte;
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*pba = addr;
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dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV);
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end = PAGE_ALIGN((addr + len));
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while(addr < end) {
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page = va;
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{
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pgd_t *pgdp;
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pmd_t *pmdp;
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pte_t *ptep;
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long i;
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pgdp = pgd_offset(&init_mm, addr);
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pmdp = pmd_offset(pgdp, addr);
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ptep = pte_offset_map(pmdp, addr);
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set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot));
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i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
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iopte = (iopte_t *)(iounit->page_table + i);
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*iopte = MKIOPTE(__pa(page));
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}
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addr += PAGE_SIZE;
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va += PAGE_SIZE;
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}
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flush_cache_all();
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flush_tlb_all();
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return 0;
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}
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static void iounit_unmap_dma_area(struct device *dev, unsigned long addr, int len)
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{
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/* XXX Somebody please fill this in */
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}
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#endif
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static const struct sparc32_dma_ops iounit_dma_ops = {
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.get_scsi_one = iounit_get_scsi_one,
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.get_scsi_sgl = iounit_get_scsi_sgl,
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.release_scsi_one = iounit_release_scsi_one,
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.release_scsi_sgl = iounit_release_scsi_sgl,
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#ifdef CONFIG_SBUS
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.map_dma_area = iounit_map_dma_area,
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.unmap_dma_area = iounit_unmap_dma_area,
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#endif
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};
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void __init ld_mmu_iounit(void)
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{
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sparc32_dma_ops = &iounit_dma_ops;
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}
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