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-rw-r--r--arch/sparc64/kernel/pci_iommu.c855
1 files changed, 855 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/pci_iommu.c b/arch/sparc64/kernel/pci_iommu.c
new file mode 100644
index 000000000000..292983413ae2
--- /dev/null
+++ b/arch/sparc64/kernel/pci_iommu.c
@@ -0,0 +1,855 @@
+/* $Id: pci_iommu.c,v 1.17 2001/12/17 07:05:09 davem Exp $
+ * pci_iommu.c: UltraSparc PCI controller IOM/STC support.
+ *
+ * Copyright (C) 1999 David S. Miller (davem@redhat.com)
+ * Copyright (C) 1999, 2000 Jakub Jelinek (jakub@redhat.com)
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+
+#include <asm/pbm.h>
+
+#include "iommu_common.h"
+
+#define PCI_STC_CTXMATCH_ADDR(STC, CTX) \
+ ((STC)->strbuf_ctxmatch_base + ((CTX) << 3))
+
+/* Accessing IOMMU and Streaming Buffer registers.
+ * REG parameter is a physical address. All registers
+ * are 64-bits in size.
+ */
+#define pci_iommu_read(__reg) \
+({ u64 __ret; \
+ __asm__ __volatile__("ldxa [%1] %2, %0" \
+ : "=r" (__ret) \
+ : "r" (__reg), "i" (ASI_PHYS_BYPASS_EC_E) \
+ : "memory"); \
+ __ret; \
+})
+#define pci_iommu_write(__reg, __val) \
+ __asm__ __volatile__("stxa %0, [%1] %2" \
+ : /* no outputs */ \
+ : "r" (__val), "r" (__reg), \
+ "i" (ASI_PHYS_BYPASS_EC_E))
+
+/* Must be invoked under the IOMMU lock. */
+static void __iommu_flushall(struct pci_iommu *iommu)
+{
+ unsigned long tag;
+ int entry;
+
+ tag = iommu->iommu_flush + (0xa580UL - 0x0210UL);
+ for (entry = 0; entry < 16; entry++) {
+ pci_iommu_write(tag, 0);
+ tag += 8;
+ }
+
+ /* Ensure completion of previous PIO writes. */
+ (void) pci_iommu_read(iommu->write_complete_reg);
+
+ /* Now update everyone's flush point. */
+ for (entry = 0; entry < PBM_NCLUSTERS; entry++) {
+ iommu->alloc_info[entry].flush =
+ iommu->alloc_info[entry].next;
+ }
+}
+
+#define IOPTE_CONSISTENT(CTX) \
+ (IOPTE_VALID | IOPTE_CACHE | \
+ (((CTX) << 47) & IOPTE_CONTEXT))
+
+#define IOPTE_STREAMING(CTX) \
+ (IOPTE_CONSISTENT(CTX) | IOPTE_STBUF)
+
+/* Existing mappings are never marked invalid, instead they
+ * are pointed to a dummy page.
+ */
+#define IOPTE_IS_DUMMY(iommu, iopte) \
+ ((iopte_val(*iopte) & IOPTE_PAGE) == (iommu)->dummy_page_pa)
+
+static void inline iopte_make_dummy(struct pci_iommu *iommu, iopte_t *iopte)
+{
+ unsigned long val = iopte_val(*iopte);
+
+ val &= ~IOPTE_PAGE;
+ val |= iommu->dummy_page_pa;
+
+ iopte_val(*iopte) = val;
+}
+
+void pci_iommu_table_init(struct pci_iommu *iommu, int tsbsize)
+{
+ int i;
+
+ tsbsize /= sizeof(iopte_t);
+
+ for (i = 0; i < tsbsize; i++)
+ iopte_make_dummy(iommu, &iommu->page_table[i]);
+}
+
+static iopte_t *alloc_streaming_cluster(struct pci_iommu *iommu, unsigned long npages)
+{
+ iopte_t *iopte, *limit, *first;
+ unsigned long cnum, ent, flush_point;
+
+ cnum = 0;
+ while ((1UL << cnum) < npages)
+ cnum++;
+ iopte = (iommu->page_table +
+ (cnum << (iommu->page_table_sz_bits - PBM_LOGCLUSTERS)));
+
+ if (cnum == 0)
+ limit = (iommu->page_table +
+ iommu->lowest_consistent_map);
+ else
+ limit = (iopte +
+ (1 << (iommu->page_table_sz_bits - PBM_LOGCLUSTERS)));
+
+ iopte += ((ent = iommu->alloc_info[cnum].next) << cnum);
+ flush_point = iommu->alloc_info[cnum].flush;
+
+ first = iopte;
+ for (;;) {
+ if (IOPTE_IS_DUMMY(iommu, iopte)) {
+ if ((iopte + (1 << cnum)) >= limit)
+ ent = 0;
+ else
+ ent = ent + 1;
+ iommu->alloc_info[cnum].next = ent;
+ if (ent == flush_point)
+ __iommu_flushall(iommu);
+ break;
+ }
+ iopte += (1 << cnum);
+ ent++;
+ if (iopte >= limit) {
+ iopte = (iommu->page_table +
+ (cnum <<
+ (iommu->page_table_sz_bits - PBM_LOGCLUSTERS)));
+ ent = 0;
+ }
+ if (ent == flush_point)
+ __iommu_flushall(iommu);
+ if (iopte == first)
+ goto bad;
+ }
+
+ /* I've got your streaming cluster right here buddy boy... */
+ return iopte;
+
+bad:
+ printk(KERN_EMERG "pci_iommu: alloc_streaming_cluster of npages(%ld) failed!\n",
+ npages);
+ return NULL;
+}
+
+static void free_streaming_cluster(struct pci_iommu *iommu, dma_addr_t base,
+ unsigned long npages, unsigned long ctx)
+{
+ unsigned long cnum, ent;
+
+ cnum = 0;
+ while ((1UL << cnum) < npages)
+ cnum++;
+
+ ent = (base << (32 - IO_PAGE_SHIFT + PBM_LOGCLUSTERS - iommu->page_table_sz_bits))
+ >> (32 + PBM_LOGCLUSTERS + cnum - iommu->page_table_sz_bits);
+
+ /* If the global flush might not have caught this entry,
+ * adjust the flush point such that we will flush before
+ * ever trying to reuse it.
+ */
+#define between(X,Y,Z) (((Z) - (Y)) >= ((X) - (Y)))
+ if (between(ent, iommu->alloc_info[cnum].next, iommu->alloc_info[cnum].flush))
+ iommu->alloc_info[cnum].flush = ent;
+#undef between
+}
+
+/* We allocate consistent mappings from the end of cluster zero. */
+static iopte_t *alloc_consistent_cluster(struct pci_iommu *iommu, unsigned long npages)
+{
+ iopte_t *iopte;
+
+ iopte = iommu->page_table + (1 << (iommu->page_table_sz_bits - PBM_LOGCLUSTERS));
+ while (iopte > iommu->page_table) {
+ iopte--;
+ if (IOPTE_IS_DUMMY(iommu, iopte)) {
+ unsigned long tmp = npages;
+
+ while (--tmp) {
+ iopte--;
+ if (!IOPTE_IS_DUMMY(iommu, iopte))
+ break;
+ }
+ if (tmp == 0) {
+ u32 entry = (iopte - iommu->page_table);
+
+ if (entry < iommu->lowest_consistent_map)
+ iommu->lowest_consistent_map = entry;
+ return iopte;
+ }
+ }
+ }
+ return NULL;
+}
+
+/* Allocate and map kernel buffer of size SIZE using consistent mode
+ * DMA for PCI device PDEV. Return non-NULL cpu-side address if
+ * successful and set *DMA_ADDRP to the PCI side dma address.
+ */
+void *pci_alloc_consistent(struct pci_dev *pdev, size_t size, dma_addr_t *dma_addrp)
+{
+ struct pcidev_cookie *pcp;
+ struct pci_iommu *iommu;
+ iopte_t *iopte;
+ unsigned long flags, order, first_page, ctx;
+ void *ret;
+ int npages;
+
+ size = IO_PAGE_ALIGN(size);
+ order = get_order(size);
+ if (order >= 10)
+ return NULL;
+
+ first_page = __get_free_pages(GFP_ATOMIC, order);
+ if (first_page == 0UL)
+ return NULL;
+ memset((char *)first_page, 0, PAGE_SIZE << order);
+
+ pcp = pdev->sysdata;
+ iommu = pcp->pbm->iommu;
+
+ spin_lock_irqsave(&iommu->lock, flags);
+ iopte = alloc_consistent_cluster(iommu, size >> IO_PAGE_SHIFT);
+ if (iopte == NULL) {
+ spin_unlock_irqrestore(&iommu->lock, flags);
+ free_pages(first_page, order);
+ return NULL;
+ }
+
+ *dma_addrp = (iommu->page_table_map_base +
+ ((iopte - iommu->page_table) << IO_PAGE_SHIFT));
+ ret = (void *) first_page;
+ npages = size >> IO_PAGE_SHIFT;
+ ctx = 0;
+ if (iommu->iommu_ctxflush)
+ ctx = iommu->iommu_cur_ctx++;
+ first_page = __pa(first_page);
+ while (npages--) {
+ iopte_val(*iopte) = (IOPTE_CONSISTENT(ctx) |
+ IOPTE_WRITE |
+ (first_page & IOPTE_PAGE));
+ iopte++;
+ first_page += IO_PAGE_SIZE;
+ }
+
+ {
+ int i;
+ u32 daddr = *dma_addrp;
+
+ npages = size >> IO_PAGE_SHIFT;
+ for (i = 0; i < npages; i++) {
+ pci_iommu_write(iommu->iommu_flush, daddr);
+ daddr += IO_PAGE_SIZE;
+ }
+ }
+
+ spin_unlock_irqrestore(&iommu->lock, flags);
+
+ return ret;
+}
+
+/* Free and unmap a consistent DMA translation. */
+void pci_free_consistent(struct pci_dev *pdev, size_t size, void *cpu, dma_addr_t dvma)
+{
+ struct pcidev_cookie *pcp;
+ struct pci_iommu *iommu;
+ iopte_t *iopte;
+ unsigned long flags, order, npages, i, ctx;
+
+ npages = IO_PAGE_ALIGN(size) >> IO_PAGE_SHIFT;
+ pcp = pdev->sysdata;
+ iommu = pcp->pbm->iommu;
+ iopte = iommu->page_table +
+ ((dvma - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
+
+ spin_lock_irqsave(&iommu->lock, flags);
+
+ if ((iopte - iommu->page_table) ==
+ iommu->lowest_consistent_map) {
+ iopte_t *walk = iopte + npages;
+ iopte_t *limit;
+
+ limit = (iommu->page_table +
+ (1 << (iommu->page_table_sz_bits - PBM_LOGCLUSTERS)));
+ while (walk < limit) {
+ if (!IOPTE_IS_DUMMY(iommu, walk))
+ break;
+ walk++;
+ }
+ iommu->lowest_consistent_map =
+ (walk - iommu->page_table);
+ }
+
+ /* Data for consistent mappings cannot enter the streaming
+ * buffers, so we only need to update the TSB. We flush
+ * the IOMMU here as well to prevent conflicts with the
+ * streaming mapping deferred tlb flush scheme.
+ */
+
+ ctx = 0;
+ if (iommu->iommu_ctxflush)
+ ctx = (iopte_val(*iopte) & IOPTE_CONTEXT) >> 47UL;
+
+ for (i = 0; i < npages; i++, iopte++)
+ iopte_make_dummy(iommu, iopte);
+
+ if (iommu->iommu_ctxflush) {
+ pci_iommu_write(iommu->iommu_ctxflush, ctx);
+ } else {
+ for (i = 0; i < npages; i++) {
+ u32 daddr = dvma + (i << IO_PAGE_SHIFT);
+
+ pci_iommu_write(iommu->iommu_flush, daddr);
+ }
+ }
+
+ spin_unlock_irqrestore(&iommu->lock, flags);
+
+ order = get_order(size);
+ if (order < 10)
+ free_pages((unsigned long)cpu, order);
+}
+
+/* Map a single buffer at PTR of SZ bytes for PCI DMA
+ * in streaming mode.
+ */
+dma_addr_t pci_map_single(struct pci_dev *pdev, void *ptr, size_t sz, int direction)
+{
+ struct pcidev_cookie *pcp;
+ struct pci_iommu *iommu;
+ struct pci_strbuf *strbuf;
+ iopte_t *base;
+ unsigned long flags, npages, oaddr;
+ unsigned long i, base_paddr, ctx;
+ u32 bus_addr, ret;
+ unsigned long iopte_protection;
+
+ pcp = pdev->sysdata;
+ iommu = pcp->pbm->iommu;
+ strbuf = &pcp->pbm->stc;
+
+ if (direction == PCI_DMA_NONE)
+ BUG();
+
+ oaddr = (unsigned long)ptr;
+ npages = IO_PAGE_ALIGN(oaddr + sz) - (oaddr & IO_PAGE_MASK);
+ npages >>= IO_PAGE_SHIFT;
+
+ spin_lock_irqsave(&iommu->lock, flags);
+
+ base = alloc_streaming_cluster(iommu, npages);
+ if (base == NULL)
+ goto bad;
+ bus_addr = (iommu->page_table_map_base +
+ ((base - iommu->page_table) << IO_PAGE_SHIFT));
+ ret = bus_addr | (oaddr & ~IO_PAGE_MASK);
+ base_paddr = __pa(oaddr & IO_PAGE_MASK);
+ ctx = 0;
+ if (iommu->iommu_ctxflush)
+ ctx = iommu->iommu_cur_ctx++;
+ if (strbuf->strbuf_enabled)
+ iopte_protection = IOPTE_STREAMING(ctx);
+ else
+ iopte_protection = IOPTE_CONSISTENT(ctx);
+ if (direction != PCI_DMA_TODEVICE)
+ iopte_protection |= IOPTE_WRITE;
+
+ for (i = 0; i < npages; i++, base++, base_paddr += IO_PAGE_SIZE)
+ iopte_val(*base) = iopte_protection | base_paddr;
+
+ spin_unlock_irqrestore(&iommu->lock, flags);
+
+ return ret;
+
+bad:
+ spin_unlock_irqrestore(&iommu->lock, flags);
+ return PCI_DMA_ERROR_CODE;
+}
+
+/* Unmap a single streaming mode DMA translation. */
+void pci_unmap_single(struct pci_dev *pdev, dma_addr_t bus_addr, size_t sz, int direction)
+{
+ struct pcidev_cookie *pcp;
+ struct pci_iommu *iommu;
+ struct pci_strbuf *strbuf;
+ iopte_t *base;
+ unsigned long flags, npages, i, ctx;
+
+ if (direction == PCI_DMA_NONE)
+ BUG();
+
+ pcp = pdev->sysdata;
+ iommu = pcp->pbm->iommu;
+ strbuf = &pcp->pbm->stc;
+
+ npages = IO_PAGE_ALIGN(bus_addr + sz) - (bus_addr & IO_PAGE_MASK);
+ npages >>= IO_PAGE_SHIFT;
+ base = iommu->page_table +
+ ((bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
+#ifdef DEBUG_PCI_IOMMU
+ if (IOPTE_IS_DUMMY(iommu, base))
+ printk("pci_unmap_single called on non-mapped region %08x,%08x from %016lx\n",
+ bus_addr, sz, __builtin_return_address(0));
+#endif
+ bus_addr &= IO_PAGE_MASK;
+
+ spin_lock_irqsave(&iommu->lock, flags);
+
+ /* Record the context, if any. */
+ ctx = 0;
+ if (iommu->iommu_ctxflush)
+ ctx = (iopte_val(*base) & IOPTE_CONTEXT) >> 47UL;
+
+ /* Step 1: Kick data out of streaming buffers if necessary. */
+ if (strbuf->strbuf_enabled) {
+ u32 vaddr = bus_addr;
+
+ PCI_STC_FLUSHFLAG_INIT(strbuf);
+ if (strbuf->strbuf_ctxflush &&
+ iommu->iommu_ctxflush) {
+ unsigned long matchreg, flushreg;
+
+ flushreg = strbuf->strbuf_ctxflush;
+ matchreg = PCI_STC_CTXMATCH_ADDR(strbuf, ctx);
+ do {
+ pci_iommu_write(flushreg, ctx);
+ } while(((long)pci_iommu_read(matchreg)) < 0L);
+ } else {
+ for (i = 0; i < npages; i++, vaddr += IO_PAGE_SIZE)
+ pci_iommu_write(strbuf->strbuf_pflush, vaddr);
+ }
+
+ pci_iommu_write(strbuf->strbuf_fsync, strbuf->strbuf_flushflag_pa);
+ (void) pci_iommu_read(iommu->write_complete_reg);
+ while (!PCI_STC_FLUSHFLAG_SET(strbuf))
+ membar("#LoadLoad");
+ }
+
+ /* Step 2: Clear out first TSB entry. */
+ iopte_make_dummy(iommu, base);
+
+ free_streaming_cluster(iommu, bus_addr - iommu->page_table_map_base,
+ npages, ctx);
+
+ spin_unlock_irqrestore(&iommu->lock, flags);
+}
+
+#define SG_ENT_PHYS_ADDRESS(SG) \
+ (__pa(page_address((SG)->page)) + (SG)->offset)
+
+static inline void fill_sg(iopte_t *iopte, struct scatterlist *sg,
+ int nused, int nelems, unsigned long iopte_protection)
+{
+ struct scatterlist *dma_sg = sg;
+ struct scatterlist *sg_end = sg + nelems;
+ int i;
+
+ for (i = 0; i < nused; i++) {
+ unsigned long pteval = ~0UL;
+ u32 dma_npages;
+
+ dma_npages = ((dma_sg->dma_address & (IO_PAGE_SIZE - 1UL)) +
+ dma_sg->dma_length +
+ ((IO_PAGE_SIZE - 1UL))) >> IO_PAGE_SHIFT;
+ do {
+ unsigned long offset;
+ signed int len;
+
+ /* If we are here, we know we have at least one
+ * more page to map. So walk forward until we
+ * hit a page crossing, and begin creating new
+ * mappings from that spot.
+ */
+ for (;;) {
+ unsigned long tmp;
+
+ tmp = SG_ENT_PHYS_ADDRESS(sg);
+ len = sg->length;
+ if (((tmp ^ pteval) >> IO_PAGE_SHIFT) != 0UL) {
+ pteval = tmp & IO_PAGE_MASK;
+ offset = tmp & (IO_PAGE_SIZE - 1UL);
+ break;
+ }
+ if (((tmp ^ (tmp + len - 1UL)) >> IO_PAGE_SHIFT) != 0UL) {
+ pteval = (tmp + IO_PAGE_SIZE) & IO_PAGE_MASK;
+ offset = 0UL;
+ len -= (IO_PAGE_SIZE - (tmp & (IO_PAGE_SIZE - 1UL)));
+ break;
+ }
+ sg++;
+ }
+
+ pteval = iopte_protection | (pteval & IOPTE_PAGE);
+ while (len > 0) {
+ *iopte++ = __iopte(pteval);
+ pteval += IO_PAGE_SIZE;
+ len -= (IO_PAGE_SIZE - offset);
+ offset = 0;
+ dma_npages--;
+ }
+
+ pteval = (pteval & IOPTE_PAGE) + len;
+ sg++;
+
+ /* Skip over any tail mappings we've fully mapped,
+ * adjusting pteval along the way. Stop when we
+ * detect a page crossing event.
+ */
+ while (sg < sg_end &&
+ (pteval << (64 - IO_PAGE_SHIFT)) != 0UL &&
+ (pteval == SG_ENT_PHYS_ADDRESS(sg)) &&
+ ((pteval ^
+ (SG_ENT_PHYS_ADDRESS(sg) + sg->length - 1UL)) >> IO_PAGE_SHIFT) == 0UL) {
+ pteval += sg->length;
+ sg++;
+ }
+ if ((pteval << (64 - IO_PAGE_SHIFT)) == 0UL)
+ pteval = ~0UL;
+ } while (dma_npages != 0);
+ dma_sg++;
+ }
+}
+
+/* Map a set of buffers described by SGLIST with NELEMS array
+ * elements in streaming mode for PCI DMA.
+ * When making changes here, inspect the assembly output. I was having
+ * hard time to kepp this routine out of using stack slots for holding variables.
+ */
+int pci_map_sg(struct pci_dev *pdev, struct scatterlist *sglist, int nelems, int direction)
+{
+ struct pcidev_cookie *pcp;
+ struct pci_iommu *iommu;
+ struct pci_strbuf *strbuf;
+ unsigned long flags, ctx, npages, iopte_protection;
+ iopte_t *base;
+ u32 dma_base;
+ struct scatterlist *sgtmp;
+ int used;
+
+ /* Fast path single entry scatterlists. */
+ if (nelems == 1) {
+ sglist->dma_address =
+ pci_map_single(pdev,
+ (page_address(sglist->page) + sglist->offset),
+ sglist->length, direction);
+ sglist->dma_length = sglist->length;
+ return 1;
+ }
+
+ pcp = pdev->sysdata;
+ iommu = pcp->pbm->iommu;
+ strbuf = &pcp->pbm->stc;
+
+ if (direction == PCI_DMA_NONE)
+ BUG();
+
+ /* Step 1: Prepare scatter list. */
+
+ npages = prepare_sg(sglist, nelems);
+
+ /* Step 2: Allocate a cluster. */
+
+ spin_lock_irqsave(&iommu->lock, flags);
+
+ base = alloc_streaming_cluster(iommu, npages);
+ if (base == NULL)
+ goto bad;
+ dma_base = iommu->page_table_map_base + ((base - iommu->page_table) << IO_PAGE_SHIFT);
+
+ /* Step 3: Normalize DMA addresses. */
+ used = nelems;
+
+ sgtmp = sglist;
+ while (used && sgtmp->dma_length) {
+ sgtmp->dma_address += dma_base;
+ sgtmp++;
+ used--;
+ }
+ used = nelems - used;
+
+ /* Step 4: Choose a context if necessary. */
+ ctx = 0;
+ if (iommu->iommu_ctxflush)
+ ctx = iommu->iommu_cur_ctx++;
+
+ /* Step 5: Create the mappings. */
+ if (strbuf->strbuf_enabled)
+ iopte_protection = IOPTE_STREAMING(ctx);
+ else
+ iopte_protection = IOPTE_CONSISTENT(ctx);
+ if (direction != PCI_DMA_TODEVICE)
+ iopte_protection |= IOPTE_WRITE;
+ fill_sg (base, sglist, used, nelems, iopte_protection);
+#ifdef VERIFY_SG
+ verify_sglist(sglist, nelems, base, npages);
+#endif
+
+ spin_unlock_irqrestore(&iommu->lock, flags);
+
+ return used;
+
+bad:
+ spin_unlock_irqrestore(&iommu->lock, flags);
+ return PCI_DMA_ERROR_CODE;
+}
+
+/* Unmap a set of streaming mode DMA translations. */
+void pci_unmap_sg(struct pci_dev *pdev, struct scatterlist *sglist, int nelems, int direction)
+{
+ struct pcidev_cookie *pcp;
+ struct pci_iommu *iommu;
+ struct pci_strbuf *strbuf;
+ iopte_t *base;
+ unsigned long flags, ctx, i, npages;
+ u32 bus_addr;
+
+ if (direction == PCI_DMA_NONE)
+ BUG();
+
+ pcp = pdev->sysdata;
+ iommu = pcp->pbm->iommu;
+ strbuf = &pcp->pbm->stc;
+
+ bus_addr = sglist->dma_address & IO_PAGE_MASK;
+
+ for (i = 1; i < nelems; i++)
+ if (sglist[i].dma_length == 0)
+ break;
+ i--;
+ npages = (IO_PAGE_ALIGN(sglist[i].dma_address + sglist[i].dma_length) - bus_addr) >> IO_PAGE_SHIFT;
+
+ base = iommu->page_table +
+ ((bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
+
+#ifdef DEBUG_PCI_IOMMU
+ if (IOPTE_IS_DUMMY(iommu, base))
+ printk("pci_unmap_sg called on non-mapped region %016lx,%d from %016lx\n", sglist->dma_address, nelems, __builtin_return_address(0));
+#endif
+
+ spin_lock_irqsave(&iommu->lock, flags);
+
+ /* Record the context, if any. */
+ ctx = 0;
+ if (iommu->iommu_ctxflush)
+ ctx = (iopte_val(*base) & IOPTE_CONTEXT) >> 47UL;
+
+ /* Step 1: Kick data out of streaming buffers if necessary. */
+ if (strbuf->strbuf_enabled) {
+ u32 vaddr = (u32) bus_addr;
+
+ PCI_STC_FLUSHFLAG_INIT(strbuf);
+ if (strbuf->strbuf_ctxflush &&
+ iommu->iommu_ctxflush) {
+ unsigned long matchreg, flushreg;
+
+ flushreg = strbuf->strbuf_ctxflush;
+ matchreg = PCI_STC_CTXMATCH_ADDR(strbuf, ctx);
+ do {
+ pci_iommu_write(flushreg, ctx);
+ } while(((long)pci_iommu_read(matchreg)) < 0L);
+ } else {
+ for (i = 0; i < npages; i++, vaddr += IO_PAGE_SIZE)
+ pci_iommu_write(strbuf->strbuf_pflush, vaddr);
+ }
+
+ pci_iommu_write(strbuf->strbuf_fsync, strbuf->strbuf_flushflag_pa);
+ (void) pci_iommu_read(iommu->write_complete_reg);
+ while (!PCI_STC_FLUSHFLAG_SET(strbuf))
+ membar("#LoadLoad");
+ }
+
+ /* Step 2: Clear out first TSB entry. */
+ iopte_make_dummy(iommu, base);
+
+ free_streaming_cluster(iommu, bus_addr - iommu->page_table_map_base,
+ npages, ctx);
+
+ spin_unlock_irqrestore(&iommu->lock, flags);
+}
+
+/* Make physical memory consistent for a single
+ * streaming mode DMA translation after a transfer.
+ */
+void pci_dma_sync_single_for_cpu(struct pci_dev *pdev, dma_addr_t bus_addr, size_t sz, int direction)
+{
+ struct pcidev_cookie *pcp;
+ struct pci_iommu *iommu;
+ struct pci_strbuf *strbuf;
+ unsigned long flags, ctx, npages;
+
+ pcp = pdev->sysdata;
+ iommu = pcp->pbm->iommu;
+ strbuf = &pcp->pbm->stc;
+
+ if (!strbuf->strbuf_enabled)
+ return;
+
+ spin_lock_irqsave(&iommu->lock, flags);
+
+ npages = IO_PAGE_ALIGN(bus_addr + sz) - (bus_addr & IO_PAGE_MASK);
+ npages >>= IO_PAGE_SHIFT;
+ bus_addr &= IO_PAGE_MASK;
+
+ /* Step 1: Record the context, if any. */
+ ctx = 0;
+ if (iommu->iommu_ctxflush &&
+ strbuf->strbuf_ctxflush) {
+ iopte_t *iopte;
+
+ iopte = iommu->page_table +
+ ((bus_addr - iommu->page_table_map_base)>>IO_PAGE_SHIFT);
+ ctx = (iopte_val(*iopte) & IOPTE_CONTEXT) >> 47UL;
+ }
+
+ /* Step 2: Kick data out of streaming buffers. */
+ PCI_STC_FLUSHFLAG_INIT(strbuf);
+ if (iommu->iommu_ctxflush &&
+ strbuf->strbuf_ctxflush) {
+ unsigned long matchreg, flushreg;
+
+ flushreg = strbuf->strbuf_ctxflush;
+ matchreg = PCI_STC_CTXMATCH_ADDR(strbuf, ctx);
+ do {
+ pci_iommu_write(flushreg, ctx);
+ } while(((long)pci_iommu_read(matchreg)) < 0L);
+ } else {
+ unsigned long i;
+
+ for (i = 0; i < npages; i++, bus_addr += IO_PAGE_SIZE)
+ pci_iommu_write(strbuf->strbuf_pflush, bus_addr);
+ }
+
+ /* Step 3: Perform flush synchronization sequence. */
+ pci_iommu_write(strbuf->strbuf_fsync, strbuf->strbuf_flushflag_pa);
+ (void) pci_iommu_read(iommu->write_complete_reg);
+ while (!PCI_STC_FLUSHFLAG_SET(strbuf))
+ membar("#LoadLoad");
+
+ spin_unlock_irqrestore(&iommu->lock, flags);
+}
+
+/* Make physical memory consistent for a set of streaming
+ * mode DMA translations after a transfer.
+ */
+void pci_dma_sync_sg_for_cpu(struct pci_dev *pdev, struct scatterlist *sglist, int nelems, int direction)
+{
+ struct pcidev_cookie *pcp;
+ struct pci_iommu *iommu;
+ struct pci_strbuf *strbuf;
+ unsigned long flags, ctx;
+
+ pcp = pdev->sysdata;
+ iommu = pcp->pbm->iommu;
+ strbuf = &pcp->pbm->stc;
+
+ if (!strbuf->strbuf_enabled)
+ return;
+
+ spin_lock_irqsave(&iommu->lock, flags);
+
+ /* Step 1: Record the context, if any. */
+ ctx = 0;
+ if (iommu->iommu_ctxflush &&
+ strbuf->strbuf_ctxflush) {
+ iopte_t *iopte;
+
+ iopte = iommu->page_table +
+ ((sglist[0].dma_address - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
+ ctx = (iopte_val(*iopte) & IOPTE_CONTEXT) >> 47UL;
+ }
+
+ /* Step 2: Kick data out of streaming buffers. */
+ PCI_STC_FLUSHFLAG_INIT(strbuf);
+ if (iommu->iommu_ctxflush &&
+ strbuf->strbuf_ctxflush) {
+ unsigned long matchreg, flushreg;
+
+ flushreg = strbuf->strbuf_ctxflush;
+ matchreg = PCI_STC_CTXMATCH_ADDR(strbuf, ctx);
+ do {
+ pci_iommu_write(flushreg, ctx);
+ } while (((long)pci_iommu_read(matchreg)) < 0L);
+ } else {
+ unsigned long i, npages;
+ u32 bus_addr;
+
+ bus_addr = sglist[0].dma_address & IO_PAGE_MASK;
+
+ for(i = 1; i < nelems; i++)
+ if (!sglist[i].dma_length)
+ break;
+ i--;
+ npages = (IO_PAGE_ALIGN(sglist[i].dma_address + sglist[i].dma_length) - bus_addr) >> IO_PAGE_SHIFT;
+ for (i = 0; i < npages; i++, bus_addr += IO_PAGE_SIZE)
+ pci_iommu_write(strbuf->strbuf_pflush, bus_addr);
+ }
+
+ /* Step 3: Perform flush synchronization sequence. */
+ pci_iommu_write(strbuf->strbuf_fsync, strbuf->strbuf_flushflag_pa);
+ (void) pci_iommu_read(iommu->write_complete_reg);
+ while (!PCI_STC_FLUSHFLAG_SET(strbuf))
+ membar("#LoadLoad");
+
+ spin_unlock_irqrestore(&iommu->lock, flags);
+}
+
+static void ali_sound_dma_hack(struct pci_dev *pdev, int set_bit)
+{
+ struct pci_dev *ali_isa_bridge;
+ u8 val;
+
+ /* ALI sound chips generate 31-bits of DMA, a special register
+ * determines what bit 31 is emitted as.
+ */
+ ali_isa_bridge = pci_get_device(PCI_VENDOR_ID_AL,
+ PCI_DEVICE_ID_AL_M1533,
+ NULL);
+
+ pci_read_config_byte(ali_isa_bridge, 0x7e, &val);
+ if (set_bit)
+ val |= 0x01;
+ else
+ val &= ~0x01;
+ pci_write_config_byte(ali_isa_bridge, 0x7e, val);
+ pci_dev_put(ali_isa_bridge);
+}
+
+int pci_dma_supported(struct pci_dev *pdev, u64 device_mask)
+{
+ struct pcidev_cookie *pcp = pdev->sysdata;
+ u64 dma_addr_mask;
+
+ if (pdev == NULL) {
+ dma_addr_mask = 0xffffffff;
+ } else {
+ struct pci_iommu *iommu = pcp->pbm->iommu;
+
+ dma_addr_mask = iommu->dma_addr_mask;
+
+ if (pdev->vendor == PCI_VENDOR_ID_AL &&
+ pdev->device == PCI_DEVICE_ID_AL_M5451 &&
+ device_mask == 0x7fffffff) {
+ ali_sound_dma_hack(pdev,
+ (dma_addr_mask & 0x80000000) != 0);
+ return 1;
+ }
+ }
+
+ if (device_mask >= (1UL << 32UL))
+ return 0;
+
+ return (device_mask & dma_addr_mask) == dma_addr_mask;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-28 11:55:38 +0000