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263 lines
6.9 KiB
263 lines
6.9 KiB
// SPDX-License-Identifier: GPL-2.0
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/*
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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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#include "mm_32.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 __iomem *xpt;
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iopte_t __iomem *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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xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t);
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for (; xpt < xptend; xpt++)
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sbus_writel(0, xpt);
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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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sbus_writel(iopte_val(iopte), &iounit->page_table[scan]);
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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 __iomem *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 = iounit->page_table + i;
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sbus_writel(iopte_val(MKIOPTE(__pa(page))), iopte);
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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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