1 files changed, 318 insertions, 0 deletions

diff --git a/arch/sparc/mm/io-unit.c b/arch/sparc/mm/io-unit.c
new file mode 100644
index 0000000..eefffa1
--- /dev/null
+++ b/arch/sparc/mm/io-unit.c
@@ -0,0 +1,318 @@
+/* $Id: io-unit.c,v 1.24 2001/12/17 07:05:09 davem Exp $
+ * io-unit.c:  IO-UNIT specific routines for memory management.
+ *
+ * Copyright (C) 1997,1998 Jakub Jelinek    (jj@sunsite.mff.cuni.cz)
+ */
+ 
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>	/* pte_offset_map => kmap_atomic */
+#include <linux/bitops.h>
+
+#include <asm/scatterlist.h>
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+#include <asm/sbus.h>
+#include <asm/io.h>
+#include <asm/io-unit.h>
+#include <asm/mxcc.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+#include <asm/dma.h>
+
+/* #define IOUNIT_DEBUG */
+#ifdef IOUNIT_DEBUG
+#define IOD(x) printk(x)
+#else
+#define IOD(x) do { } while (0)
+#endif
+
+#define IOPERM        (IOUPTE_CACHE | IOUPTE_WRITE | IOUPTE_VALID)
+#define MKIOPTE(phys) __iopte((((phys)>>4) & IOUPTE_PAGE) | IOPERM)
+
+void __init
+iounit_init(int sbi_node, int io_node, struct sbus_bus *sbus)
+{
+	iopte_t *xpt, *xptend;
+	struct iounit_struct *iounit;
+	struct linux_prom_registers iommu_promregs[PROMREG_MAX];
+	struct resource r;
+
+	iounit = kmalloc(sizeof(struct iounit_struct), GFP_ATOMIC);
+
+	memset(iounit, 0, sizeof(*iounit));
+	iounit->limit[0] = IOUNIT_BMAP1_START;
+	iounit->limit[1] = IOUNIT_BMAP2_START;
+	iounit->limit[2] = IOUNIT_BMAPM_START;
+	iounit->limit[3] = IOUNIT_BMAPM_END;
+	iounit->rotor[1] = IOUNIT_BMAP2_START;
+	iounit->rotor[2] = IOUNIT_BMAPM_START;
+
+	xpt = NULL;
+	if(prom_getproperty(sbi_node, "reg", (void *) iommu_promregs,
+			    sizeof(iommu_promregs)) != -1) {
+		prom_apply_generic_ranges(io_node, 0, iommu_promregs, 3);
+		memset(&r, 0, sizeof(r));
+		r.flags = iommu_promregs[2].which_io;
+		r.start = iommu_promregs[2].phys_addr;
+		xpt = (iopte_t *) sbus_ioremap(&r, 0, PAGE_SIZE * 16, "XPT");
+	}
+	if(!xpt) panic("Cannot map External Page Table.");
+	
+	sbus->iommu = (struct iommu_struct *)iounit;
+	iounit->page_table = xpt;
+	
+	for (xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t);
+	     xpt < xptend;)
+	     	iopte_val(*xpt++) = 0;
+}
+
+/* One has to hold iounit->lock to call this */
+static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long vaddr, int size)
+{
+	int i, j, k, npages;
+	unsigned long rotor, scan, limit;
+	iopte_t iopte;
+
+        npages = ((vaddr & ~PAGE_MASK) + size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
+
+	/* A tiny bit of magic ingredience :) */
+	switch (npages) {
+	case 1: i = 0x0231; break;
+	case 2: i = 0x0132; break;
+	default: i = 0x0213; break;
+	}
+	
+	IOD(("iounit_get_area(%08lx,%d[%d])=", vaddr, size, npages));
+	
+next:	j = (i & 15);
+	rotor = iounit->rotor[j - 1];
+	limit = iounit->limit[j];
+	scan = rotor;
+nexti:	scan = find_next_zero_bit(iounit->bmap, limit, scan);
+	if (scan + npages > limit) {
+		if (limit != rotor) {
+			limit = rotor;
+			scan = iounit->limit[j - 1];
+			goto nexti;
+		}
+		i >>= 4;
+		if (!(i & 15))
+			panic("iounit_get_area: Couldn't find free iopte slots for (%08lx,%d)\n", vaddr, size);
+		goto next;
+	}
+	for (k = 1, scan++; k < npages; k++)
+		if (test_bit(scan++, iounit->bmap))
+			goto nexti;
+	iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1];
+	scan -= npages;
+	iopte = MKIOPTE(__pa(vaddr & PAGE_MASK));
+	vaddr = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + (vaddr & ~PAGE_MASK);
+	for (k = 0; k < npages; k++, iopte = __iopte(iopte_val(iopte) + 0x100), scan++) {
+		set_bit(scan, iounit->bmap);
+		iounit->page_table[scan] = iopte;
+	}
+	IOD(("%08lx\n", vaddr));
+	return vaddr;
+}
+
+static __u32 iounit_get_scsi_one(char *vaddr, unsigned long len, struct sbus_bus *sbus)
+{
+	unsigned long ret, flags;
+	struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
+	
+	spin_lock_irqsave(&iounit->lock, flags);
+	ret = iounit_get_area(iounit, (unsigned long)vaddr, len);
+	spin_unlock_irqrestore(&iounit->lock, flags);
+	return ret;
+}
+
+static void iounit_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
+{
+	unsigned long flags;
+	struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
+
+	/* FIXME: Cache some resolved pages - often several sg entries are to the same page */
+	spin_lock_irqsave(&iounit->lock, flags);
+	while (sz != 0) {
+		--sz;
+		sg[sz].dvma_address = iounit_get_area(iounit, (unsigned long)page_address(sg[sz].page) + sg[sz].offset, sg[sz].length);
+		sg[sz].dvma_length = sg[sz].length;
+	}
+	spin_unlock_irqrestore(&iounit->lock, flags);
+}
+
+static void iounit_release_scsi_one(__u32 vaddr, unsigned long len, struct sbus_bus *sbus)
+{
+	unsigned long flags;
+	struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
+	
+	spin_lock_irqsave(&iounit->lock, flags);
+	len = ((vaddr & ~PAGE_MASK) + len + (PAGE_SIZE-1)) >> PAGE_SHIFT;
+	vaddr = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
+	IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
+	for (len += vaddr; vaddr < len; vaddr++)
+		clear_bit(vaddr, iounit->bmap);
+	spin_unlock_irqrestore(&iounit->lock, flags);
+}
+
+static void iounit_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
+{
+	unsigned long flags;
+	unsigned long vaddr, len;
+	struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
+
+	spin_lock_irqsave(&iounit->lock, flags);
+	while (sz != 0) {
+		--sz;
+		len = ((sg[sz].dvma_address & ~PAGE_MASK) + sg[sz].length + (PAGE_SIZE-1)) >> PAGE_SHIFT;
+		vaddr = (sg[sz].dvma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
+		IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
+		for (len += vaddr; vaddr < len; vaddr++)
+			clear_bit(vaddr, iounit->bmap);
+	}
+	spin_unlock_irqrestore(&iounit->lock, flags);
+}
+
+#ifdef CONFIG_SBUS
+static int iounit_map_dma_area(dma_addr_t *pba, unsigned long va, __u32 addr, int len)
+{
+	unsigned long page, end;
+	pgprot_t dvma_prot;
+	iopte_t *iopte;
+	struct sbus_bus *sbus;
+
+	*pba = addr;
+
+	dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV);
+	end = PAGE_ALIGN((addr + len));
+	while(addr < end) {
+		page = va;
+		{
+			pgd_t *pgdp;
+			pmd_t *pmdp;
+			pte_t *ptep;
+			long i;
+
+			pgdp = pgd_offset(&init_mm, addr);
+			pmdp = pmd_offset(pgdp, addr);
+			ptep = pte_offset_map(pmdp, addr);
+
+			set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot));
+			
+			i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
+
+			for_each_sbus(sbus) {
+				struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
+
+				iopte = (iopte_t *)(iounit->page_table + i);
+				*iopte = MKIOPTE(__pa(page));
+			}
+		}
+		addr += PAGE_SIZE;
+		va += PAGE_SIZE;
+	}
+	flush_cache_all();
+	flush_tlb_all();
+
+	return 0;
+}
+
+static void iounit_unmap_dma_area(unsigned long addr, int len)
+{
+	/* XXX Somebody please fill this in */
+}
+
+/* XXX We do not pass sbus device here, bad. */
+static struct page *iounit_translate_dvma(unsigned long addr)
+{
+	struct sbus_bus *sbus = sbus_root;	/* They are all the same */
+	struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
+	int i;
+	iopte_t *iopte;
+
+	i = ((addr - IOUNIT_DMA_BASE) >> PAGE_SHIFT);
+	iopte = (iopte_t *)(iounit->page_table + i);
+	return pfn_to_page(iopte_val(*iopte) >> (PAGE_SHIFT-4)); /* XXX sun4d guru, help */
+}
+#endif
+
+static char *iounit_lockarea(char *vaddr, unsigned long len)
+{
+/* FIXME: Write this */
+	return vaddr;
+}
+
+static void iounit_unlockarea(char *vaddr, unsigned long len)
+{
+/* FIXME: Write this */
+}
+
+void __init ld_mmu_iounit(void)
+{
+	BTFIXUPSET_CALL(mmu_lockarea, iounit_lockarea, BTFIXUPCALL_RETO0);
+	BTFIXUPSET_CALL(mmu_unlockarea, iounit_unlockarea, BTFIXUPCALL_NOP);
+
+	BTFIXUPSET_CALL(mmu_get_scsi_one, iounit_get_scsi_one, BTFIXUPCALL_NORM);
+	BTFIXUPSET_CALL(mmu_get_scsi_sgl, iounit_get_scsi_sgl, BTFIXUPCALL_NORM);
+	BTFIXUPSET_CALL(mmu_release_scsi_one, iounit_release_scsi_one, BTFIXUPCALL_NORM);
+	BTFIXUPSET_CALL(mmu_release_scsi_sgl, iounit_release_scsi_sgl, BTFIXUPCALL_NORM);
+
+#ifdef CONFIG_SBUS
+	BTFIXUPSET_CALL(mmu_map_dma_area, iounit_map_dma_area, BTFIXUPCALL_NORM);
+	BTFIXUPSET_CALL(mmu_unmap_dma_area, iounit_unmap_dma_area, BTFIXUPCALL_NORM);
+	BTFIXUPSET_CALL(mmu_translate_dvma, iounit_translate_dvma, BTFIXUPCALL_NORM);
+#endif
+}
+
+__u32 iounit_map_dma_init(struct sbus_bus *sbus, int size)
+{
+	int i, j, k, npages;
+	unsigned long rotor, scan, limit;
+	unsigned long flags;
+	__u32 ret;
+	struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
+
+        npages = (size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
+	i = 0x0213;
+	spin_lock_irqsave(&iounit->lock, flags);
+next:	j = (i & 15);
+	rotor = iounit->rotor[j - 1];
+	limit = iounit->limit[j];
+	scan = rotor;
+nexti:	scan = find_next_zero_bit(iounit->bmap, limit, scan);
+	if (scan + npages > limit) {
+		if (limit != rotor) {
+			limit = rotor;
+			scan = iounit->limit[j - 1];
+			goto nexti;
+		}
+		i >>= 4;
+		if (!(i & 15))
+			panic("iounit_map_dma_init: Couldn't find free iopte slots for %d bytes\n", size);
+		goto next;
+	}
+	for (k = 1, scan++; k < npages; k++)
+		if (test_bit(scan++, iounit->bmap))
+			goto nexti;
+	iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1];
+	scan -= npages;
+	ret = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT);
+	for (k = 0; k < npages; k++, scan++)
+		set_bit(scan, iounit->bmap);
+	spin_unlock_irqrestore(&iounit->lock, flags);
+	return ret;
+}
+
+__u32 iounit_map_dma_page(__u32 vaddr, void *addr, struct sbus_bus *sbus)
+{
+	int scan = (vaddr - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
+	struct iounit_struct *iounit = (struct iounit_struct *)sbus->iommu;
+	
+	iounit->page_table[scan] = MKIOPTE(__pa(((unsigned long)addr) & PAGE_MASK));
+	return vaddr + (((unsigned long)addr) & ~PAGE_MASK);
+}