[PATCH v2 22/28] sparc32: Drop unused sbus iommu support

From: Sam Ravnborg via B4 Relay
Date: Sat Mar 09 2024 - 13:22:07 EST

From: Sam Ravnborg <sam@xxxxxxxxxxxx>

LEON do not have sbus iommu support - drop it.

Signed-off-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxxxx>
Cc: Andreas Larsson <andreas@xxxxxxxxxxx>
---
arch/sparc/include/asm/iommu.h | 2 -
arch/sparc/include/asm/iommu_32.h | 122 -----------
arch/sparc/kernel/ioport.c | 1 -
arch/sparc/mm/Makefile | 2 +-
arch/sparc/mm/iommu.c | 420 --------------------------------------
arch/sparc/mm/mm_32.h | 3 -
arch/sparc/mm/srmmu.c | 3 -
7 files changed, 1 insertion(+), 552 deletions(-)

diff --git a/arch/sparc/include/asm/iommu.h b/arch/sparc/include/asm/iommu.h
index 37935cb34865..ea07526ff476 100644
--- a/arch/sparc/include/asm/iommu.h
+++ b/arch/sparc/include/asm/iommu.h
@@ -3,7 +3,5 @@
#define ___ASM_SPARC_IOMMU_H
#if defined(__sparc__) && defined(__arch64__)
#include <asm/iommu_64.h>
-#else
-#include <asm/iommu_32.h>
#endif
#endif
diff --git a/arch/sparc/include/asm/iommu_32.h b/arch/sparc/include/asm/iommu_32.h
deleted file mode 100644
index af51cd5ea3c1..000000000000
--- a/arch/sparc/include/asm/iommu_32.h
+++ /dev/null
@@ -1,122 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* iommu.h: Definitions for the sun4m IOMMU.
- *
- * Copyright (C) 1996 David S. Miller (davem@xxxxxxxxxxxxxxxx)
- */
-#ifndef _SPARC_IOMMU_H
-#define _SPARC_IOMMU_H
-
-#include <asm/page.h>
-#include <asm/bitext.h>
-
-/* The iommu handles all virtual to physical address translations
- * that occur between the SBUS and physical memory. Access by
- * the cpu to IO registers and similar go over the mbus so are
- * translated by the on chip SRMMU. The iommu and the srmmu do
- * not need to have the same translations at all, in fact most
- * of the time the translations they handle are a disjunct set.
- * Basically the iommu handles all dvma sbus activity.
- */
-
-/* The IOMMU registers occupy three pages in IO space. */
-struct iommu_regs {
- /* First page */
- volatile unsigned long control; /* IOMMU control */
- volatile unsigned long base; /* Physical base of iopte page table */
- volatile unsigned long _unused1[3];
- volatile unsigned long tlbflush; /* write only */
- volatile unsigned long pageflush; /* write only */
- volatile unsigned long _unused2[1017];
- /* Second page */
- volatile unsigned long afsr; /* Async-fault status register */
- volatile unsigned long afar; /* Async-fault physical address */
- volatile unsigned long _unused3[2];
- volatile unsigned long sbuscfg0; /* SBUS configuration registers, per-slot */
- volatile unsigned long sbuscfg1;
- volatile unsigned long sbuscfg2;
- volatile unsigned long sbuscfg3;
- volatile unsigned long mfsr; /* Memory-fault status register */
- volatile unsigned long mfar; /* Memory-fault physical address */
- volatile unsigned long _unused4[1014];
- /* Third page */
- volatile unsigned long mid; /* IOMMU module-id */
-};
-
-#define IOMMU_CTRL_IMPL 0xf0000000 /* Implementation */
-#define IOMMU_CTRL_VERS 0x0f000000 /* Version */
-#define IOMMU_CTRL_RNGE 0x0000001c /* Mapping RANGE */
-#define IOMMU_RNGE_16MB 0x00000000 /* 0xff000000 -> 0xffffffff */
-#define IOMMU_RNGE_32MB 0x00000004 /* 0xfe000000 -> 0xffffffff */
-#define IOMMU_RNGE_64MB 0x00000008 /* 0xfc000000 -> 0xffffffff */
-#define IOMMU_RNGE_128MB 0x0000000c /* 0xf8000000 -> 0xffffffff */
-#define IOMMU_RNGE_256MB 0x00000010 /* 0xf0000000 -> 0xffffffff */
-#define IOMMU_RNGE_512MB 0x00000014 /* 0xe0000000 -> 0xffffffff */
-#define IOMMU_RNGE_1GB 0x00000018 /* 0xc0000000 -> 0xffffffff */
-#define IOMMU_RNGE_2GB 0x0000001c /* 0x80000000 -> 0xffffffff */
-#define IOMMU_CTRL_ENAB 0x00000001 /* IOMMU Enable */
-
-#define IOMMU_AFSR_ERR 0x80000000 /* LE, TO, or BE asserted */
-#define IOMMU_AFSR_LE 0x40000000 /* SBUS reports error after transaction */
-#define IOMMU_AFSR_TO 0x20000000 /* Write access took more than 12.8 us. */
-#define IOMMU_AFSR_BE 0x10000000 /* Write access received error acknowledge */
-#define IOMMU_AFSR_SIZE 0x0e000000 /* Size of transaction causing error */
-#define IOMMU_AFSR_S 0x01000000 /* Sparc was in supervisor mode */
-#define IOMMU_AFSR_RESV 0x00f00000 /* Reserver, forced to 0x8 by hardware */
-#define IOMMU_AFSR_ME 0x00080000 /* Multiple errors occurred */
-#define IOMMU_AFSR_RD 0x00040000 /* A read operation was in progress */
-#define IOMMU_AFSR_FAV 0x00020000 /* IOMMU afar has valid contents */
-
-#define IOMMU_SBCFG_SAB30 0x00010000 /* Phys-address bit 30 when bypass enabled */
-#define IOMMU_SBCFG_BA16 0x00000004 /* Slave supports 16 byte bursts */
-#define IOMMU_SBCFG_BA8 0x00000002 /* Slave supports 8 byte bursts */
-#define IOMMU_SBCFG_BYPASS 0x00000001 /* Bypass IOMMU, treat all addresses
- produced by this device as pure
- physical. */
-
-#define IOMMU_MFSR_ERR 0x80000000 /* One or more of PERR1 or PERR0 */
-#define IOMMU_MFSR_S 0x01000000 /* Sparc was in supervisor mode */
-#define IOMMU_MFSR_CPU 0x00800000 /* CPU transaction caused parity error */
-#define IOMMU_MFSR_ME 0x00080000 /* Multiple parity errors occurred */
-#define IOMMU_MFSR_PERR 0x00006000 /* high bit indicates parity error occurred
- on the even word of the access, low bit
- indicated odd word caused the parity error */
-#define IOMMU_MFSR_BM 0x00001000 /* Error occurred while in boot mode */
-#define IOMMU_MFSR_C 0x00000800 /* Address causing error was marked cacheable */
-#define IOMMU_MFSR_RTYP 0x000000f0 /* Memory request transaction type */
-
-#define IOMMU_MID_SBAE 0x001f0000 /* SBus arbitration enable */
-#define IOMMU_MID_SE 0x00100000 /* Enables SCSI/ETHERNET arbitration */
-#define IOMMU_MID_SB3 0x00080000 /* Enable SBUS device 3 arbitration */
-#define IOMMU_MID_SB2 0x00040000 /* Enable SBUS device 2 arbitration */
-#define IOMMU_MID_SB1 0x00020000 /* Enable SBUS device 1 arbitration */
-#define IOMMU_MID_SB0 0x00010000 /* Enable SBUS device 0 arbitration */
-#define IOMMU_MID_MID 0x0000000f /* Module-id, hardcoded to 0x8 */
-
-/* The format of an iopte in the page tables */
-#define IOPTE_PAGE 0x07ffff00 /* Physical page number (PA[30:12]) */
-#define IOPTE_CACHE 0x00000080 /* Cached (in vme IOCACHE or Viking/MXCC) */
-#define IOPTE_WRITE 0x00000004 /* Writeable */
-#define IOPTE_VALID 0x00000002 /* IOPTE is valid */
-#define IOPTE_WAZ 0x00000001 /* Write as zeros */
-
-struct iommu_struct {
- struct iommu_regs __iomem *regs;
- iopte_t *page_table;
- /* For convenience */
- unsigned long start; /* First managed virtual address */
- unsigned long end; /* Last managed virtual address */
-
- struct bit_map usemap;
-};
-
-static inline void iommu_invalidate(struct iommu_regs __iomem *regs)
-{
- sbus_writel(0, &regs->tlbflush);
-}
-
-static inline void iommu_invalidate_page(struct iommu_regs __iomem *regs, unsigned long ba)
-{
- sbus_writel(ba & PAGE_MASK, &regs->pageflush);
-}
-
-#endif /* !(_SPARC_IOMMU_H) */
diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c
index 745579a40785..9c4c72775274 100644
--- a/arch/sparc/kernel/ioport.c
+++ b/arch/sparc/kernel/ioport.c
@@ -48,7 +48,6 @@
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/dma.h>
-#include <asm/iommu.h>
#include <asm/leon.h>

static void __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz);
diff --git a/arch/sparc/mm/Makefile b/arch/sparc/mm/Makefile
index f8a897e24438..ad5c50aee517 100644
--- a/arch/sparc/mm/Makefile
+++ b/arch/sparc/mm/Makefile
@@ -7,7 +7,7 @@ asflags-y := -ansi
obj-$(CONFIG_SPARC64) += ultra.o tlb.o tsb.o
obj-y += fault_$(BITS).o
obj-y += init_$(BITS).o
-obj-$(CONFIG_SPARC32) += srmmu.o iommu.o
+obj-$(CONFIG_SPARC32) += srmmu.o
obj-$(CONFIG_SPARC32) += leon_mm.o

# Only used by sparc64
diff --git a/arch/sparc/mm/iommu.c b/arch/sparc/mm/iommu.c
deleted file mode 100644
index 482e08df7bad..000000000000
--- a/arch/sparc/mm/iommu.c
+++ /dev/null
@@ -1,420 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * iommu.c: IOMMU specific routines for memory management.
- *
- * Copyright (C) 1995 David S. Miller (davem@xxxxxxxxxxxxxxxx)
- * Copyright (C) 1995,2002 Pete Zaitcev (zaitcev@xxxxxxxxx)
- * Copyright (C) 1996 Eddie C. Dost (ecd@xxxxxxxxx)
- * Copyright (C) 1997,1998 Jakub Jelinek (jj@xxxxxxxxxxxxxxxxxxx)
- */
-
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include <linux/dma-map-ops.h>
-#include <linux/of.h>
-#include <linux/of_platform.h>
-#include <linux/platform_device.h>
-
-#include <asm/io.h>
-#include <asm/cacheflush.h>
-#include <asm/tlbflush.h>
-#include <asm/bitext.h>
-#include <asm/iommu.h>
-#include <asm/dma.h>
-
-#include "mm_32.h"
-
-/*
- * This can be sized dynamically, but we will do this
- * only when we have a guidance about actual I/O pressures.
- */
-#define IOMMU_RNGE IOMMU_RNGE_256MB
-#define IOMMU_START 0xF0000000
-#define IOMMU_WINSIZE (256*1024*1024U)
-#define IOMMU_NPTES (IOMMU_WINSIZE/PAGE_SIZE) /* 64K PTEs, 256KB */
-#define IOMMU_ORDER 6 /* 4096 * (1<<6) */
-
-/*
- * Values precomputed according to CPU type.
- */
-static unsigned int ioperm_noc; /* Consistent mapping iopte flags */
-static pgprot_t dvma_prot; /* Consistent mapping pte flags */
-
-#define IOPERM (IOPTE_CACHE | IOPTE_WRITE | IOPTE_VALID)
-#define MKIOPTE(pfn, perm) (((((pfn)<<8) & IOPTE_PAGE) | (perm)) & ~IOPTE_WAZ)
-
-static const struct dma_map_ops sbus_iommu_dma_gflush_ops;
-static const struct dma_map_ops sbus_iommu_dma_pflush_ops;
-
-static void __init sbus_iommu_init(struct platform_device *op)
-{
- struct iommu_struct *iommu;
- unsigned int impl, vers;
- unsigned long *bitmap;
- unsigned long control;
- unsigned long base;
- unsigned long tmp;
-
- iommu = kmalloc(sizeof(struct iommu_struct), GFP_KERNEL);
- if (!iommu) {
- prom_printf("Unable to allocate iommu structure\n");
- prom_halt();
- }
-
- iommu->regs = of_ioremap(&op->resource[0], 0, PAGE_SIZE * 3,
- "iommu_regs");
- if (!iommu->regs) {
- prom_printf("Cannot map IOMMU registers\n");
- prom_halt();
- }
-
- control = sbus_readl(&iommu->regs->control);
- impl = (control & IOMMU_CTRL_IMPL) >> 28;
- vers = (control & IOMMU_CTRL_VERS) >> 24;
- control &= ~(IOMMU_CTRL_RNGE);
- control |= (IOMMU_RNGE_256MB | IOMMU_CTRL_ENAB);
- sbus_writel(control, &iommu->regs->control);
-
- iommu_invalidate(iommu->regs);
- iommu->start = IOMMU_START;
- iommu->end = 0xffffffff;
-
- /* Allocate IOMMU page table */
- /* Stupid alignment constraints give me a headache.
- We need 256K or 512K or 1M or 2M area aligned to
- its size and current gfp will fortunately give
- it to us. */
- tmp = __get_free_pages(GFP_KERNEL, IOMMU_ORDER);
- if (!tmp) {
- prom_printf("Unable to allocate iommu table [0x%lx]\n",
- IOMMU_NPTES * sizeof(iopte_t));
- prom_halt();
- }
- iommu->page_table = (iopte_t *)tmp;
-
- /* Initialize new table. */
- memset(iommu->page_table, 0, IOMMU_NPTES*sizeof(iopte_t));
- flush_cache_all();
- flush_tlb_all();
-
- base = __pa((unsigned long)iommu->page_table) >> 4;
- sbus_writel(base, &iommu->regs->base);
- iommu_invalidate(iommu->regs);
-
- bitmap = kmalloc(IOMMU_NPTES>>3, GFP_KERNEL);
- if (!bitmap) {
- prom_printf("Unable to allocate iommu bitmap [%d]\n",
- (int)(IOMMU_NPTES>>3));
- prom_halt();
- }
- bit_map_init(&iommu->usemap, bitmap, IOMMU_NPTES);
- iommu->usemap.num_colors = 1;
-
- printk(KERN_INFO "IOMMU: impl %d vers %d table 0x%p[%d B] map [%d b]\n",
- impl, vers, iommu->page_table,
- (int)(IOMMU_NPTES*sizeof(iopte_t)), (int)IOMMU_NPTES);
-
- op->dev.archdata.iommu = iommu;
-
- if (flush_page_for_dma_global)
- op->dev.dma_ops = &sbus_iommu_dma_gflush_ops;
- else
- op->dev.dma_ops = &sbus_iommu_dma_pflush_ops;
-}
-
-static int __init iommu_init(void)
-{
- struct device_node *dp;
-
- for_each_node_by_name(dp, "iommu") {
- struct platform_device *op = of_find_device_by_node(dp);
-
- sbus_iommu_init(op);
- of_propagate_archdata(op);
- }
-
- return 0;
-}
-
-subsys_initcall(iommu_init);
-
-/* Flush the iotlb entries to ram. */
-/* This could be better if we didn't have to flush whole pages. */
-static void iommu_flush_iotlb(iopte_t *iopte, unsigned int niopte)
-{
- unsigned long start;
- unsigned long end;
-
- start = (unsigned long)iopte;
- end = PAGE_ALIGN(start + niopte*sizeof(iopte_t));
- start &= PAGE_MASK;
- while(start < end) {
- __flush_page_to_ram(start);
- start += PAGE_SIZE;
- }
-}
-
-static dma_addr_t __sbus_iommu_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t len, bool per_page_flush)
-{
- struct iommu_struct *iommu = dev->archdata.iommu;
- phys_addr_t paddr = page_to_phys(page) + offset;
- unsigned long off = paddr & ~PAGE_MASK;
- unsigned long npages = (off + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
- unsigned long pfn = __phys_to_pfn(paddr);
- unsigned int busa, busa0;
- iopte_t *iopte, *iopte0;
- int ioptex, i;
-
- /* XXX So what is maxphys for us and how do drivers know it? */
- if (!len || len > 256 * 1024)
- return DMA_MAPPING_ERROR;
-
- /*
- * We expect unmapped highmem pages to be not in the cache.
- * XXX Is this a good assumption?
- * XXX What if someone else unmaps it here and races us?
- */
- if (per_page_flush && !PageHighMem(page)) {
- unsigned long vaddr, p;
-
- vaddr = (unsigned long)page_address(page) + offset;
- for (p = vaddr & PAGE_MASK; p < vaddr + len; p += PAGE_SIZE)
- flush_page_for_dma(p);
- }
-
- /* page color = pfn of page */
- ioptex = bit_map_string_get(&iommu->usemap, npages, pfn);
- if (ioptex < 0)
- panic("iommu out");
- busa0 = iommu->start + (ioptex << PAGE_SHIFT);
- iopte0 = &iommu->page_table[ioptex];
-
- busa = busa0;
- iopte = iopte0;
- for (i = 0; i < npages; i++) {
- iopte_val(*iopte) = MKIOPTE(pfn, IOPERM);
- iommu_invalidate_page(iommu->regs, busa);
- busa += PAGE_SIZE;
- iopte++;
- pfn++;
- }
-
- iommu_flush_iotlb(iopte0, npages);
- return busa0 + off;
-}
-
-static dma_addr_t sbus_iommu_map_page_gflush(struct device *dev,
- struct page *page, unsigned long offset, size_t len,
- enum dma_data_direction dir, unsigned long attrs)
-{
- flush_page_for_dma(0);
- return __sbus_iommu_map_page(dev, page, offset, len, false);
-}
-
-static dma_addr_t sbus_iommu_map_page_pflush(struct device *dev,
- struct page *page, unsigned long offset, size_t len,
- enum dma_data_direction dir, unsigned long attrs)
-{
- return __sbus_iommu_map_page(dev, page, offset, len, true);
-}
-
-static int __sbus_iommu_map_sg(struct device *dev, struct scatterlist *sgl,
- int nents, enum dma_data_direction dir, unsigned long attrs,
- bool per_page_flush)
-{
- struct scatterlist *sg;
- int j;
-
- for_each_sg(sgl, sg, nents, j) {
- sg->dma_address =__sbus_iommu_map_page(dev, sg_page(sg),
- sg->offset, sg->length, per_page_flush);
- if (sg->dma_address == DMA_MAPPING_ERROR)
- return -EIO;
- sg->dma_length = sg->length;
- }
-
- return nents;
-}
-
-static int sbus_iommu_map_sg_gflush(struct device *dev, struct scatterlist *sgl,
- int nents, enum dma_data_direction dir, unsigned long attrs)
-{
- flush_page_for_dma(0);
- return __sbus_iommu_map_sg(dev, sgl, nents, dir, attrs, false);
-}
-
-static int sbus_iommu_map_sg_pflush(struct device *dev, struct scatterlist *sgl,
- int nents, enum dma_data_direction dir, unsigned long attrs)
-{
- return __sbus_iommu_map_sg(dev, sgl, nents, dir, attrs, true);
-}
-
-static void sbus_iommu_unmap_page(struct device *dev, dma_addr_t dma_addr,
- size_t len, enum dma_data_direction dir, unsigned long attrs)
-{
- struct iommu_struct *iommu = dev->archdata.iommu;
- unsigned int busa = dma_addr & PAGE_MASK;
- unsigned long off = dma_addr & ~PAGE_MASK;
- unsigned int npages = (off + len + PAGE_SIZE-1) >> PAGE_SHIFT;
- unsigned int ioptex = (busa - iommu->start) >> PAGE_SHIFT;
- unsigned int i;
-
- BUG_ON(busa < iommu->start);
- for (i = 0; i < npages; i++) {
- iopte_val(iommu->page_table[ioptex + i]) = 0;
- iommu_invalidate_page(iommu->regs, busa);
- busa += PAGE_SIZE;
- }
- bit_map_clear(&iommu->usemap, ioptex, npages);
-}
-
-static void sbus_iommu_unmap_sg(struct device *dev, struct scatterlist *sgl,
- int nents, enum dma_data_direction dir, unsigned long attrs)
-{
- struct scatterlist *sg;
- int i;
-
- for_each_sg(sgl, sg, nents, i) {
- sbus_iommu_unmap_page(dev, sg->dma_address, sg->length, dir,
- attrs);
- sg->dma_address = 0x21212121;
- }
-}
-
-#ifdef CONFIG_SBUS
-static void *sbus_iommu_alloc(struct device *dev, size_t len,
- dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
-{
- struct iommu_struct *iommu = dev->archdata.iommu;
- unsigned long va, addr, page, end, ret;
- iopte_t *iopte = iommu->page_table;
- iopte_t *first;
- int ioptex;
-
- /* XXX So what is maxphys for us and how do drivers know it? */
- if (!len || len > 256 * 1024)
- return NULL;
-
- len = PAGE_ALIGN(len);
- va = __get_free_pages(gfp | __GFP_ZERO, get_order(len));
- if (va == 0)
- return NULL;
-
- addr = ret = sparc_dma_alloc_resource(dev, len);
- if (!addr)
- goto out_free_pages;
-
- BUG_ON((va & ~PAGE_MASK) != 0);
- BUG_ON((addr & ~PAGE_MASK) != 0);
- BUG_ON((len & ~PAGE_MASK) != 0);
-
- /* page color = physical address */
- ioptex = bit_map_string_get(&iommu->usemap, len >> PAGE_SHIFT,
- addr >> PAGE_SHIFT);
- if (ioptex < 0)
- panic("iommu out");
-
- iopte += ioptex;
- first = iopte;
- end = addr + len;
- while(addr < end) {
- page = va;
- {
- pmd_t *pmdp;
- pte_t *ptep;
-
- __flush_page_to_ram(page);
-
- pmdp = pmd_off_k(addr);
- ptep = pte_offset_kernel(pmdp, addr);
-
- set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot));
- }
- iopte_val(*iopte++) =
- MKIOPTE(page_to_pfn(virt_to_page(page)), ioperm_noc);
- addr += PAGE_SIZE;
- va += PAGE_SIZE;
- }
- /* P3: why do we need this?
- *
- * DAVEM: Because there are several aspects, none of which
- * are handled by a single interface. Some cpus are
- * completely not I/O DMA coherent, and some have
- * virtually indexed caches. The driver DMA flushing
- * methods handle the former case, but here during
- * IOMMU page table modifications, and usage of non-cacheable
- * cpu mappings of pages potentially in the cpu caches, we have
- * to handle the latter case as well.
- */
- flush_cache_all();
- iommu_flush_iotlb(first, len >> PAGE_SHIFT);
- flush_tlb_all();
- iommu_invalidate(iommu->regs);
-
- *dma_handle = iommu->start + (ioptex << PAGE_SHIFT);
- return (void *)ret;
-
-out_free_pages:
- free_pages(va, get_order(len));
- return NULL;
-}
-
-static void sbus_iommu_free(struct device *dev, size_t len, void *cpu_addr,
- dma_addr_t busa, unsigned long attrs)
-{
- struct iommu_struct *iommu = dev->archdata.iommu;
- iopte_t *iopte = iommu->page_table;
- struct page *page = virt_to_page(cpu_addr);
- int ioptex = (busa - iommu->start) >> PAGE_SHIFT;
- unsigned long end;
-
- if (!sparc_dma_free_resource(cpu_addr, len))
- return;
-
- BUG_ON((busa & ~PAGE_MASK) != 0);
- BUG_ON((len & ~PAGE_MASK) != 0);
-
- iopte += ioptex;
- end = busa + len;
- while (busa < end) {
- iopte_val(*iopte++) = 0;
- busa += PAGE_SIZE;
- }
- flush_tlb_all();
- iommu_invalidate(iommu->regs);
- bit_map_clear(&iommu->usemap, ioptex, len >> PAGE_SHIFT);
-
- __free_pages(page, get_order(len));
-}
-#endif
-
-static const struct dma_map_ops sbus_iommu_dma_gflush_ops = {
-#ifdef CONFIG_SBUS
- .alloc = sbus_iommu_alloc,
- .free = sbus_iommu_free,
-#endif
- .map_page = sbus_iommu_map_page_gflush,
- .unmap_page = sbus_iommu_unmap_page,
- .map_sg = sbus_iommu_map_sg_gflush,
- .unmap_sg = sbus_iommu_unmap_sg,
-};
-
-static const struct dma_map_ops sbus_iommu_dma_pflush_ops = {
-#ifdef CONFIG_SBUS
- .alloc = sbus_iommu_alloc,
- .free = sbus_iommu_free,
-#endif
- .map_page = sbus_iommu_map_page_pflush,
- .unmap_page = sbus_iommu_unmap_page,
- .map_sg = sbus_iommu_map_sg_pflush,
- .unmap_sg = sbus_iommu_unmap_sg,
-};
-
-void __init ld_mmu_iommu(void)
-{
- dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV);
- ioperm_noc = IOPTE_CACHE | IOPTE_WRITE | IOPTE_VALID;
-}
diff --git a/arch/sparc/mm/mm_32.h b/arch/sparc/mm/mm_32.h
index 2c83b8ce742d..102e6a5162b0 100644
--- a/arch/sparc/mm/mm_32.h
+++ b/arch/sparc/mm/mm_32.h
@@ -14,6 +14,3 @@ extern int flush_page_for_dma_global;
extern void (*poke_srmmu)(void);

void __init srmmu_paging_init(void);
-
-/* iommu.c */
-void ld_mmu_iommu(void);
diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
index 949247a6896b..dab71cd3fdb2 100644
--- a/arch/sparc/mm/srmmu.c
+++ b/arch/sparc/mm/srmmu.c
@@ -1023,10 +1023,7 @@ void __init load_mmu(void)
/* It really is const after this point. */
sparc32_cachetlb_ops = (const struct sparc32_cachetlb_ops *)
&smp_cachetlb_ops;
-#endif

- ld_mmu_iommu();
-#ifdef CONFIG_SMP
leon_init_smp();
#endif
}

--
2.34.1