328 lines
8.7 KiB
C
328 lines
8.7 KiB
C
/*
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* arch/ppc64/kernel/u3_iommu.c
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*
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* Copyright (C) 2004 Olof Johansson <olof@austin.ibm.com>, IBM Corporation
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*
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* Based on pSeries_iommu.c:
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* Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
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* Copyright (C) 2004 Olof Johansson <olof@austin.ibm.com>, IBM Corporation
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*
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* Dynamic DMA mapping support, Apple U3 & IBM CPC925 "DART" iommu.
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/spinlock.h>
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#include <linux/string.h>
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#include <linux/pci.h>
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#include <linux/dma-mapping.h>
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#include <linux/vmalloc.h>
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#include <asm/io.h>
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#include <asm/prom.h>
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#include <asm/ppcdebug.h>
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#include <asm/iommu.h>
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#include <asm/pci-bridge.h>
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#include <asm/machdep.h>
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#include <asm/abs_addr.h>
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#include <asm/cacheflush.h>
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#include <asm/lmb.h>
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#include <asm/dart.h>
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#include <asm/ppc-pci.h>
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extern int iommu_force_on;
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/* Physical base address and size of the DART table */
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unsigned long dart_tablebase; /* exported to htab_initialize */
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static unsigned long dart_tablesize;
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/* Virtual base address of the DART table */
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static u32 *dart_vbase;
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/* Mapped base address for the dart */
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static unsigned int *dart;
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/* Dummy val that entries are set to when unused */
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static unsigned int dart_emptyval;
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static struct iommu_table iommu_table_u3;
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static int iommu_table_u3_inited;
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static int dart_dirty;
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#define DBG(...)
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static inline void dart_tlb_invalidate_all(void)
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{
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unsigned long l = 0;
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unsigned int reg;
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unsigned long limit;
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DBG("dart: flush\n");
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/* To invalidate the DART, set the DARTCNTL_FLUSHTLB bit in the
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* control register and wait for it to clear.
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*
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* Gotcha: Sometimes, the DART won't detect that the bit gets
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* set. If so, clear it and set it again.
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*/
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limit = 0;
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retry:
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reg = in_be32((unsigned int *)dart+DARTCNTL);
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reg |= DARTCNTL_FLUSHTLB;
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out_be32((unsigned int *)dart+DARTCNTL, reg);
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l = 0;
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while ((in_be32((unsigned int *)dart+DARTCNTL) & DARTCNTL_FLUSHTLB) &&
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l < (1L<<limit)) {
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l++;
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}
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if (l == (1L<<limit)) {
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if (limit < 4) {
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limit++;
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reg = in_be32((unsigned int *)dart+DARTCNTL);
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reg &= ~DARTCNTL_FLUSHTLB;
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out_be32((unsigned int *)dart+DARTCNTL, reg);
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goto retry;
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} else
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panic("U3-DART: TLB did not flush after waiting a long "
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"time. Buggy U3 ?");
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}
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}
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static void dart_flush(struct iommu_table *tbl)
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{
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if (dart_dirty)
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dart_tlb_invalidate_all();
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dart_dirty = 0;
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}
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static void dart_build(struct iommu_table *tbl, long index,
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long npages, unsigned long uaddr,
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enum dma_data_direction direction)
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{
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unsigned int *dp;
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unsigned int rpn;
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DBG("dart: build at: %lx, %lx, addr: %x\n", index, npages, uaddr);
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index <<= DART_PAGE_FACTOR;
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npages <<= DART_PAGE_FACTOR;
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dp = ((unsigned int*)tbl->it_base) + index;
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/* On U3, all memory is contigous, so we can move this
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* out of the loop.
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*/
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while (npages--) {
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rpn = virt_to_abs(uaddr) >> DART_PAGE_SHIFT;
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*(dp++) = DARTMAP_VALID | (rpn & DARTMAP_RPNMASK);
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rpn++;
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uaddr += DART_PAGE_SIZE;
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}
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dart_dirty = 1;
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}
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static void dart_free(struct iommu_table *tbl, long index, long npages)
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{
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unsigned int *dp;
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/* We don't worry about flushing the TLB cache. The only drawback of
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* not doing it is that we won't catch buggy device drivers doing
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* bad DMAs, but then no 32-bit architecture ever does either.
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*/
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DBG("dart: free at: %lx, %lx\n", index, npages);
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index <<= DART_PAGE_FACTOR;
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npages <<= DART_PAGE_FACTOR;
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dp = ((unsigned int *)tbl->it_base) + index;
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while (npages--)
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*(dp++) = dart_emptyval;
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}
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static int dart_init(struct device_node *dart_node)
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{
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unsigned int regword;
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unsigned int i;
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unsigned long tmp;
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if (dart_tablebase == 0 || dart_tablesize == 0) {
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printk(KERN_INFO "U3-DART: table not allocated, using direct DMA\n");
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return -ENODEV;
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}
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/* Make sure nothing from the DART range remains in the CPU cache
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* from a previous mapping that existed before the kernel took
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* over
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*/
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flush_dcache_phys_range(dart_tablebase, dart_tablebase + dart_tablesize);
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/* Allocate a spare page to map all invalid DART pages. We need to do
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* that to work around what looks like a problem with the HT bridge
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* prefetching into invalid pages and corrupting data
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*/
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tmp = lmb_alloc(DART_PAGE_SIZE, DART_PAGE_SIZE);
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if (!tmp)
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panic("U3-DART: Cannot allocate spare page!");
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dart_emptyval = DARTMAP_VALID | ((tmp >> DART_PAGE_SHIFT) & DARTMAP_RPNMASK);
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/* Map in DART registers. FIXME: Use device node to get base address */
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dart = ioremap(DART_BASE, 0x7000);
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if (dart == NULL)
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panic("U3-DART: Cannot map registers!");
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/* Set initial control register contents: table base,
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* table size and enable bit
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*/
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regword = DARTCNTL_ENABLE |
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((dart_tablebase >> DART_PAGE_SHIFT) << DARTCNTL_BASE_SHIFT) |
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(((dart_tablesize >> DART_PAGE_SHIFT) & DARTCNTL_SIZE_MASK)
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<< DARTCNTL_SIZE_SHIFT);
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dart_vbase = ioremap(virt_to_abs(dart_tablebase), dart_tablesize);
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/* Fill initial table */
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for (i = 0; i < dart_tablesize/4; i++)
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dart_vbase[i] = dart_emptyval;
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/* Initialize DART with table base and enable it. */
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out_be32((unsigned int *)dart, regword);
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/* Invalidate DART to get rid of possible stale TLBs */
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dart_tlb_invalidate_all();
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printk(KERN_INFO "U3/CPC925 DART IOMMU initialized\n");
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return 0;
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}
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static void iommu_table_u3_setup(void)
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{
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iommu_table_u3.it_busno = 0;
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iommu_table_u3.it_offset = 0;
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/* it_size is in number of entries */
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iommu_table_u3.it_size = dart_tablesize / sizeof(u32);
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/* Initialize the common IOMMU code */
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iommu_table_u3.it_base = (unsigned long)dart_vbase;
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iommu_table_u3.it_index = 0;
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iommu_table_u3.it_blocksize = 1;
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iommu_init_table(&iommu_table_u3);
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/* Reserve the last page of the DART to avoid possible prefetch
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* past the DART mapped area
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*/
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set_bit(iommu_table_u3.it_size - 1, iommu_table_u3.it_map);
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}
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static void iommu_dev_setup_u3(struct pci_dev *dev)
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{
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struct device_node *dn;
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/* We only have one iommu table on the mac for now, which makes
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* things simple. Setup all PCI devices to point to this table
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*
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* We must use pci_device_to_OF_node() to make sure that
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* we get the real "final" pointer to the device in the
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* pci_dev sysdata and not the temporary PHB one
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*/
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dn = pci_device_to_OF_node(dev);
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if (dn)
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PCI_DN(dn)->iommu_table = &iommu_table_u3;
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}
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static void iommu_bus_setup_u3(struct pci_bus *bus)
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{
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struct device_node *dn;
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if (!iommu_table_u3_inited) {
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iommu_table_u3_inited = 1;
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iommu_table_u3_setup();
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}
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dn = pci_bus_to_OF_node(bus);
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if (dn)
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PCI_DN(dn)->iommu_table = &iommu_table_u3;
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}
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static void iommu_dev_setup_null(struct pci_dev *dev) { }
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static void iommu_bus_setup_null(struct pci_bus *bus) { }
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void iommu_init_early_u3(void)
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{
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struct device_node *dn;
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/* Find the DART in the device-tree */
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dn = of_find_compatible_node(NULL, "dart", "u3-dart");
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if (dn == NULL)
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return;
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/* Setup low level TCE operations for the core IOMMU code */
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ppc_md.tce_build = dart_build;
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ppc_md.tce_free = dart_free;
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ppc_md.tce_flush = dart_flush;
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/* Initialize the DART HW */
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if (dart_init(dn)) {
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/* If init failed, use direct iommu and null setup functions */
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ppc_md.iommu_dev_setup = iommu_dev_setup_null;
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ppc_md.iommu_bus_setup = iommu_bus_setup_null;
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/* Setup pci_dma ops */
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pci_direct_iommu_init();
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} else {
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ppc_md.iommu_dev_setup = iommu_dev_setup_u3;
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ppc_md.iommu_bus_setup = iommu_bus_setup_u3;
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/* Setup pci_dma ops */
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pci_iommu_init();
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}
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}
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void __init alloc_u3_dart_table(void)
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{
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/* Only reserve DART space if machine has more than 2GB of RAM
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* or if requested with iommu=on on cmdline.
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*/
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if (lmb_end_of_DRAM() <= 0x80000000ull && !iommu_force_on)
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return;
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/* 512 pages (2MB) is max DART tablesize. */
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dart_tablesize = 1UL << 21;
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/* 16MB (1 << 24) alignment. We allocate a full 16Mb chuck since we
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* will blow up an entire large page anyway in the kernel mapping
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*/
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dart_tablebase = (unsigned long)
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abs_to_virt(lmb_alloc_base(1UL<<24, 1UL<<24, 0x80000000L));
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printk(KERN_INFO "U3-DART allocated at: %lx\n", dart_tablebase);
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}
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