summaryrefslogtreecommitdiff
path: root/ANDROID_3.4.5/arch/sparc/mm/iommu.c
diff options
context:
space:
mode:
Diffstat (limited to 'ANDROID_3.4.5/arch/sparc/mm/iommu.c')
-rw-r--r--ANDROID_3.4.5/arch/sparc/mm/iommu.c471
1 files changed, 0 insertions, 471 deletions
diff --git a/ANDROID_3.4.5/arch/sparc/mm/iommu.c b/ANDROID_3.4.5/arch/sparc/mm/iommu.c
deleted file mode 100644
index 07fc6a65..00000000
--- a/ANDROID_3.4.5/arch/sparc/mm/iommu.c
+++ /dev/null
@@ -1,471 +0,0 @@
-/*
- * iommu.c: IOMMU specific routines for memory management.
- *
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- * Copyright (C) 1995,2002 Pete Zaitcev (zaitcev@yahoo.com)
- * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
- * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
- */
-
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include <linux/highmem.h> /* pte_offset_map => kmap_atomic */
-#include <linux/scatterlist.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
-
-#include <asm/pgalloc.h>
-#include <asm/pgtable.h>
-#include <asm/io.h>
-#include <asm/mxcc.h>
-#include <asm/mbus.h>
-#include <asm/cacheflush.h>
-#include <asm/tlbflush.h>
-#include <asm/bitext.h>
-#include <asm/iommu.h>
-#include <asm/dma.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, 265KB */
-#define IOMMU_ORDER 6 /* 4096 * (1<<6) */
-
-/* srmmu.c */
-extern int viking_mxcc_present;
-BTFIXUPDEF_CALL(void, flush_page_for_dma, unsigned long)
-#define flush_page_for_dma(page) BTFIXUP_CALL(flush_page_for_dma)(page)
-extern int flush_page_for_dma_global;
-static int viking_flush;
-/* viking.S */
-extern void viking_flush_page(unsigned long page);
-extern void viking_mxcc_flush_page(unsigned long page);
-
-/*
- * 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 void __init sbus_iommu_init(struct platform_device *op)
-{
- struct iommu_struct *iommu;
- unsigned int impl, vers;
- unsigned long *bitmap;
- 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();
- }
- impl = (iommu->regs->control & IOMMU_CTRL_IMPL) >> 28;
- vers = (iommu->regs->control & IOMMU_CTRL_VERS) >> 24;
- tmp = iommu->regs->control;
- tmp &= ~(IOMMU_CTRL_RNGE);
- tmp |= (IOMMU_RNGE_256MB | IOMMU_CTRL_ENAB);
- iommu->regs->control = tmp;
- 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%08x]\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();
- iommu->regs->base = __pa((unsigned long) iommu->page_table) >> 4;
- 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);
- /* To be coherent on HyperSparc, the page color of DVMA
- * and physical addresses must match.
- */
- if (srmmu_modtype == HyperSparc)
- iommu->usemap.num_colors = vac_cache_size >> PAGE_SHIFT;
- else
- 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;
-}
-
-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);
-
-/* This begs to be btfixup-ed by srmmu. */
-/* 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;
- if (viking_mxcc_present) {
- while(start < end) {
- viking_mxcc_flush_page(start);
- start += PAGE_SIZE;
- }
- } else if (viking_flush) {
- while(start < end) {
- viking_flush_page(start);
- start += PAGE_SIZE;
- }
- } else {
- while(start < end) {
- __flush_page_to_ram(start);
- start += PAGE_SIZE;
- }
- }
-}
-
-static u32 iommu_get_one(struct device *dev, struct page *page, int npages)
-{
- struct iommu_struct *iommu = dev->archdata.iommu;
- int ioptex;
- iopte_t *iopte, *iopte0;
- unsigned int busa, busa0;
- int i;
-
- /* page color = pfn of page */
- ioptex = bit_map_string_get(&iommu->usemap, npages, page_to_pfn(page));
- 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(page_to_pfn(page), IOPERM);
- iommu_invalidate_page(iommu->regs, busa);
- busa += PAGE_SIZE;
- iopte++;
- page++;
- }
-
- iommu_flush_iotlb(iopte0, npages);
-
- return busa0;
-}
-
-static u32 iommu_get_scsi_one(struct device *dev, char *vaddr, unsigned int len)
-{
- unsigned long off;
- int npages;
- struct page *page;
- u32 busa;
-
- off = (unsigned long)vaddr & ~PAGE_MASK;
- npages = (off + len + PAGE_SIZE-1) >> PAGE_SHIFT;
- page = virt_to_page((unsigned long)vaddr & PAGE_MASK);
- busa = iommu_get_one(dev, page, npages);
- return busa + off;
-}
-
-static __u32 iommu_get_scsi_one_noflush(struct device *dev, char *vaddr, unsigned long len)
-{
- return iommu_get_scsi_one(dev, vaddr, len);
-}
-
-static __u32 iommu_get_scsi_one_gflush(struct device *dev, char *vaddr, unsigned long len)
-{
- flush_page_for_dma(0);
- return iommu_get_scsi_one(dev, vaddr, len);
-}
-
-static __u32 iommu_get_scsi_one_pflush(struct device *dev, char *vaddr, unsigned long len)
-{
- unsigned long page = ((unsigned long) vaddr) & PAGE_MASK;
-
- while(page < ((unsigned long)(vaddr + len))) {
- flush_page_for_dma(page);
- page += PAGE_SIZE;
- }
- return iommu_get_scsi_one(dev, vaddr, len);
-}
-
-static void iommu_get_scsi_sgl_noflush(struct device *dev, struct scatterlist *sg, int sz)
-{
- int n;
-
- while (sz != 0) {
- --sz;
- n = (sg->length + sg->offset + PAGE_SIZE-1) >> PAGE_SHIFT;
- sg->dma_address = iommu_get_one(dev, sg_page(sg), n) + sg->offset;
- sg->dma_length = sg->length;
- sg = sg_next(sg);
- }
-}
-
-static void iommu_get_scsi_sgl_gflush(struct device *dev, struct scatterlist *sg, int sz)
-{
- int n;
-
- flush_page_for_dma(0);
- while (sz != 0) {
- --sz;
- n = (sg->length + sg->offset + PAGE_SIZE-1) >> PAGE_SHIFT;
- sg->dma_address = iommu_get_one(dev, sg_page(sg), n) + sg->offset;
- sg->dma_length = sg->length;
- sg = sg_next(sg);
- }
-}
-
-static void iommu_get_scsi_sgl_pflush(struct device *dev, struct scatterlist *sg, int sz)
-{
- unsigned long page, oldpage = 0;
- int n, i;
-
- while(sz != 0) {
- --sz;
-
- n = (sg->length + sg->offset + PAGE_SIZE-1) >> PAGE_SHIFT;
-
- /*
- * 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 ((page = (unsigned long) page_address(sg_page(sg))) != 0) {
- for (i = 0; i < n; i++) {
- if (page != oldpage) { /* Already flushed? */
- flush_page_for_dma(page);
- oldpage = page;
- }
- page += PAGE_SIZE;
- }
- }
-
- sg->dma_address = iommu_get_one(dev, sg_page(sg), n) + sg->offset;
- sg->dma_length = sg->length;
- sg = sg_next(sg);
- }
-}
-
-static void iommu_release_one(struct device *dev, u32 busa, int npages)
-{
- struct iommu_struct *iommu = dev->archdata.iommu;
- int ioptex;
- int i;
-
- BUG_ON(busa < iommu->start);
- ioptex = (busa - iommu->start) >> PAGE_SHIFT;
- 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 iommu_release_scsi_one(struct device *dev, __u32 vaddr, unsigned long len)
-{
- unsigned long off;
- int npages;
-
- off = vaddr & ~PAGE_MASK;
- npages = (off + len + PAGE_SIZE-1) >> PAGE_SHIFT;
- iommu_release_one(dev, vaddr & PAGE_MASK, npages);
-}
-
-static void iommu_release_scsi_sgl(struct device *dev, struct scatterlist *sg, int sz)
-{
- int n;
-
- while(sz != 0) {
- --sz;
-
- n = (sg->length + sg->offset + PAGE_SIZE-1) >> PAGE_SHIFT;
- iommu_release_one(dev, sg->dma_address & PAGE_MASK, n);
- sg->dma_address = 0x21212121;
- sg = sg_next(sg);
- }
-}
-
-#ifdef CONFIG_SBUS
-static int iommu_map_dma_area(struct device *dev, dma_addr_t *pba, unsigned long va,
- unsigned long addr, int len)
-{
- struct iommu_struct *iommu = dev->archdata.iommu;
- unsigned long page, end;
- iopte_t *iopte = iommu->page_table;
- iopte_t *first;
- int ioptex;
-
- 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;
- {
- pgd_t *pgdp;
- pmd_t *pmdp;
- pte_t *ptep;
-
- if (viking_mxcc_present)
- viking_mxcc_flush_page(page);
- else if (viking_flush)
- viking_flush_page(page);
- else
- __flush_page_to_ram(page);
-
- 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));
- }
- 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);
-
- *pba = iommu->start + (ioptex << PAGE_SHIFT);
- return 0;
-}
-
-static void iommu_unmap_dma_area(struct device *dev, unsigned long busa, int len)
-{
- struct iommu_struct *iommu = dev->archdata.iommu;
- iopte_t *iopte = iommu->page_table;
- unsigned long end;
- int ioptex = (busa - iommu->start) >> PAGE_SHIFT;
-
- 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);
-}
-#endif
-
-static char *iommu_lockarea(char *vaddr, unsigned long len)
-{
- return vaddr;
-}
-
-static void iommu_unlockarea(char *vaddr, unsigned long len)
-{
-}
-
-void __init ld_mmu_iommu(void)
-{
- viking_flush = (BTFIXUPVAL_CALL(flush_page_for_dma) == (unsigned long)viking_flush_page);
- BTFIXUPSET_CALL(mmu_lockarea, iommu_lockarea, BTFIXUPCALL_RETO0);
- BTFIXUPSET_CALL(mmu_unlockarea, iommu_unlockarea, BTFIXUPCALL_NOP);
-
- if (!BTFIXUPVAL_CALL(flush_page_for_dma)) {
- /* IO coherent chip */
- BTFIXUPSET_CALL(mmu_get_scsi_one, iommu_get_scsi_one_noflush, BTFIXUPCALL_RETO0);
- BTFIXUPSET_CALL(mmu_get_scsi_sgl, iommu_get_scsi_sgl_noflush, BTFIXUPCALL_NORM);
- } else if (flush_page_for_dma_global) {
- /* flush_page_for_dma flushes everything, no matter of what page is it */
- BTFIXUPSET_CALL(mmu_get_scsi_one, iommu_get_scsi_one_gflush, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(mmu_get_scsi_sgl, iommu_get_scsi_sgl_gflush, BTFIXUPCALL_NORM);
- } else {
- BTFIXUPSET_CALL(mmu_get_scsi_one, iommu_get_scsi_one_pflush, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(mmu_get_scsi_sgl, iommu_get_scsi_sgl_pflush, BTFIXUPCALL_NORM);
- }
- BTFIXUPSET_CALL(mmu_release_scsi_one, iommu_release_scsi_one, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(mmu_release_scsi_sgl, iommu_release_scsi_sgl, BTFIXUPCALL_NORM);
-
-#ifdef CONFIG_SBUS
- BTFIXUPSET_CALL(mmu_map_dma_area, iommu_map_dma_area, BTFIXUPCALL_NORM);
- BTFIXUPSET_CALL(mmu_unmap_dma_area, iommu_unmap_dma_area, BTFIXUPCALL_NORM);
-#endif
-
- if (viking_mxcc_present || srmmu_modtype == HyperSparc) {
- dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV);
- ioperm_noc = IOPTE_CACHE | IOPTE_WRITE | IOPTE_VALID;
- } else {
- dvma_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV);
- ioperm_noc = IOPTE_WRITE | IOPTE_VALID;
- }
-}
generated by cgit (git 2.34.1) at 2025-03-13 12:42:39 +0000