From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
---
arch/sparc/mm/io-unit.c | 318 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 318 insertions(+)
create mode 100644 arch/sparc/mm/io-unit.c
(limited to 'arch/sparc/mm/io-unit.c')
diff --git a/arch/sparc/mm/io-unit.c b/arch/sparc/mm/io-unit.c
new file mode 100644
index 000000000000..eefffa1dc5de
--- /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);
+}
--
cgit v1.2.1