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285 lines
7.5 KiB
285 lines
7.5 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 ([email protected]) |
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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/bitops.h> |
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#include <linux/dma-map-ops.h> |
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#include <linux/of.h> |
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#include <linux/of_device.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 const struct dma_map_ops iounit_dma_ops; |
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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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op->dev.dma_ops = &iounit_dma_ops; |
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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 dma_addr_t iounit_map_page(struct device *dev, struct page *page, |
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unsigned long offset, size_t len, enum dma_data_direction dir, |
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unsigned long attrs) |
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{ |
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void *vaddr = page_address(page) + offset; |
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struct iounit_struct *iounit = dev->archdata.iommu; |
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unsigned long ret, flags; |
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/* XXX So what is maxphys for us and how do drivers know it? */ |
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if (!len || len > 256 * 1024) |
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return DMA_MAPPING_ERROR; |
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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 int iounit_map_sg(struct device *dev, struct scatterlist *sgl, int nents, |
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enum dma_data_direction dir, unsigned long attrs) |
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{ |
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struct iounit_struct *iounit = dev->archdata.iommu; |
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struct scatterlist *sg; |
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unsigned long flags; |
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int i; |
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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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for_each_sg(sgl, sg, nents, i) { |
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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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} |
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spin_unlock_irqrestore(&iounit->lock, flags); |
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return nents; |
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} |
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static void iounit_unmap_page(struct device *dev, dma_addr_t vaddr, size_t len, |
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enum dma_data_direction dir, unsigned long attrs) |
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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_unmap_sg(struct device *dev, struct scatterlist *sgl, |
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int nents, enum dma_data_direction dir, unsigned long attrs) |
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{ |
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struct iounit_struct *iounit = dev->archdata.iommu; |
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unsigned long flags, vaddr, len; |
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struct scatterlist *sg; |
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int i; |
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spin_lock_irqsave(&iounit->lock, flags); |
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for_each_sg(sgl, sg, nents, i) { |
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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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} |
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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 void *iounit_alloc(struct device *dev, size_t len, |
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dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) |
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{ |
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struct iounit_struct *iounit = dev->archdata.iommu; |
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unsigned long va, addr, page, end, ret; |
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pgprot_t dvma_prot; |
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iopte_t __iomem *iopte; |
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/* XXX So what is maxphys for us and how do drivers know it? */ |
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if (!len || len > 256 * 1024) |
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return NULL; |
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len = PAGE_ALIGN(len); |
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va = __get_free_pages(gfp | __GFP_ZERO, get_order(len)); |
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if (!va) |
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return NULL; |
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addr = ret = sparc_dma_alloc_resource(dev, len); |
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if (!addr) |
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goto out_free_pages; |
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*dma_handle = 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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pmd_t *pmdp; |
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pte_t *ptep; |
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long i; |
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pmdp = pmd_off_k(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 (void *)ret; |
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out_free_pages: |
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free_pages(va, get_order(len)); |
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return NULL; |
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} |
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static void iounit_free(struct device *dev, size_t size, void *cpu_addr, |
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dma_addr_t dma_addr, unsigned long attrs) |
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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 dma_map_ops iounit_dma_ops = { |
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#ifdef CONFIG_SBUS |
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.alloc = iounit_alloc, |
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.free = iounit_free, |
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#endif |
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.map_page = iounit_map_page, |
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.unmap_page = iounit_unmap_page, |
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.map_sg = iounit_map_sg, |
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.unmap_sg = iounit_unmap_sg, |
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};
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