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|
/*
* arch/powerpc/sysdev/dart_iommu.c
*
* Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
* Copyright (C) 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>,
* IBM Corporation
*
* Based on pSeries_iommu.c:
* Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
* Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
*
* Dynamic DMA mapping support, Apple U3, U4 & IBM CPC925 "DART" iommu.
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/init.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/vmalloc.h>
#include <linux/suspend.h>
#include <linux/memblock.h>
#include <linux/gfp.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/iommu.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/cacheflush.h>
#include <asm/ppc-pci.h>
#include "dart.h"
/* Physical base address and size of the DART table */
unsigned long dart_tablebase; /* exported to htab_initialize */
static unsigned long dart_tablesize;
/* Virtual base address of the DART table */
static u32 *dart_vbase;
#ifdef CONFIG_PM
static u32 *dart_copy;
#endif
/* Mapped base address for the dart */
static unsigned int __iomem *dart;
/* Dummy val that entries are set to when unused */
static unsigned int dart_emptyval;
static struct iommu_table iommu_table_dart;
static int iommu_table_dart_inited;
static int dart_dirty;
static int dart_is_u4;
#define DART_U4_BYPASS_BASE 0x8000000000ull
#define DBG(...)
static DEFINE_SPINLOCK(invalidate_lock);
static inline void dart_tlb_invalidate_all(void)
{
unsigned long l = 0;
unsigned int reg, inv_bit;
unsigned long limit;
unsigned long flags;
spin_lock_irqsave(&invalidate_lock, flags);
DBG("dart: flush\n");
/* To invalidate the DART, set the DARTCNTL_FLUSHTLB bit in the
* control register and wait for it to clear.
*
* Gotcha: Sometimes, the DART won't detect that the bit gets
* set. If so, clear it and set it again.
*/
limit = 0;
inv_bit = dart_is_u4 ? DART_CNTL_U4_FLUSHTLB : DART_CNTL_U3_FLUSHTLB;
retry:
l = 0;
reg = DART_IN(DART_CNTL);
reg |= inv_bit;
DART_OUT(DART_CNTL, reg);
while ((DART_IN(DART_CNTL) & inv_bit) && l < (1L << limit))
l++;
if (l == (1L << limit)) {
if (limit < 4) {
limit++;
reg = DART_IN(DART_CNTL);
reg &= ~inv_bit;
DART_OUT(DART_CNTL, reg);
goto retry;
} else
panic("DART: TLB did not flush after waiting a long "
"time. Buggy U3 ?");
}
spin_unlock_irqrestore(&invalidate_lock, flags);
}
static inline void dart_tlb_invalidate_one(unsigned long bus_rpn)
{
unsigned int reg;
unsigned int l, limit;
unsigned long flags;
spin_lock_irqsave(&invalidate_lock, flags);
reg = DART_CNTL_U4_ENABLE | DART_CNTL_U4_IONE |
(bus_rpn & DART_CNTL_U4_IONE_MASK);
DART_OUT(DART_CNTL, reg);
limit = 0;
wait_more:
l = 0;
while ((DART_IN(DART_CNTL) & DART_CNTL_U4_IONE) && l < (1L << limit)) {
rmb();
l++;
}
if (l == (1L << limit)) {
if (limit < 4) {
limit++;
goto wait_more;
} else
panic("DART: TLB did not flush after waiting a long "
"time. Buggy U4 ?");
}
spin_unlock_irqrestore(&invalidate_lock, flags);
}
static void dart_flush(struct iommu_table *tbl)
{
mb();
if (dart_dirty) {
dart_tlb_invalidate_all();
dart_dirty = 0;
}
}
static int dart_build(struct iommu_table *tbl, long index,
long npages, unsigned long uaddr,
enum dma_data_direction direction,
struct dma_attrs *attrs)
{
unsigned int *dp;
unsigned int rpn;
long l;
DBG("dart: build at: %lx, %lx, addr: %x\n", index, npages, uaddr);
dp = ((unsigned int*)tbl->it_base) + index;
/* On U3, all memory is contiguous, so we can move this
* out of the loop.
*/
l = npages;
while (l--) {
rpn = __pa(uaddr) >> DART_PAGE_SHIFT;
*(dp++) = DARTMAP_VALID | (rpn & DARTMAP_RPNMASK);
uaddr += DART_PAGE_SIZE;
}
/* make sure all updates have reached memory */
mb();
in_be32((unsigned __iomem *)dp);
mb();
if (dart_is_u4) {
rpn = index;
while (npages--)
dart_tlb_invalidate_one(rpn++);
} else {
dart_dirty = 1;
}
return 0;
}
static void dart_free(struct iommu_table *tbl, long index, long npages)
{
unsigned int *dp;
/* We don't worry about flushing the TLB cache. The only drawback of
* not doing it is that we won't catch buggy device drivers doing
* bad DMAs, but then no 32-bit architecture ever does either.
*/
DBG("dart: free at: %lx, %lx\n", index, npages);
dp = ((unsigned int *)tbl->it_base) + index;
while (npages--)
*(dp++) = dart_emptyval;
}
static int __init dart_init(struct device_node *dart_node)
{
unsigned int i;
unsigned long tmp, base, size;
struct resource r;
if (dart_tablebase == 0 || dart_tablesize == 0) {
printk(KERN_INFO "DART: table not allocated, using "
"direct DMA\n");
return -ENODEV;
}
if (of_address_to_resource(dart_node, 0, &r))
panic("DART: can't get register base ! ");
/* Make sure nothing from the DART range remains in the CPU cache
* from a previous mapping that existed before the kernel took
* over
*/
flush_dcache_phys_range(dart_tablebase,
dart_tablebase + dart_tablesize);
/* Allocate a spare page to map all invalid DART pages. We need to do
* that to work around what looks like a problem with the HT bridge
* prefetching into invalid pages and corrupting data
*/
tmp = memblock_alloc(DART_PAGE_SIZE, DART_PAGE_SIZE);
dart_emptyval = DARTMAP_VALID | ((tmp >> DART_PAGE_SHIFT) &
DARTMAP_RPNMASK);
/* Map in DART registers */
dart = ioremap(r.start, resource_size(&r));
if (dart == NULL)
panic("DART: Cannot map registers!");
/* Map in DART table */
dart_vbase = ioremap(__pa(dart_tablebase), dart_tablesize);
/* Fill initial table */
for (i = 0; i < dart_tablesize/4; i++)
dart_vbase[i] = dart_emptyval;
/* Initialize DART with table base and enable it. */
base = dart_tablebase >> DART_PAGE_SHIFT;
size = dart_tablesize >> DART_PAGE_SHIFT;
if (dart_is_u4) {
size &= DART_SIZE_U4_SIZE_MASK;
DART_OUT(DART_BASE_U4, base);
DART_OUT(DART_SIZE_U4, size);
DART_OUT(DART_CNTL, DART_CNTL_U4_ENABLE);
} else {
size &= DART_CNTL_U3_SIZE_MASK;
DART_OUT(DART_CNTL,
DART_CNTL_U3_ENABLE |
(base << DART_CNTL_U3_BASE_SHIFT) |
(size << DART_CNTL_U3_SIZE_SHIFT));
}
/* Invalidate DART to get rid of possible stale TLBs */
dart_tlb_invalidate_all();
printk(KERN_INFO "DART IOMMU initialized for %s type chipset\n",
dart_is_u4 ? "U4" : "U3");
return 0;
}
static void iommu_table_dart_setup(void)
{
iommu_table_dart.it_busno = 0;
iommu_table_dart.it_offset = 0;
/* it_size is in number of entries */
iommu_table_dart.it_size = dart_tablesize / sizeof(u32);
iommu_table_dart.it_page_shift = IOMMU_PAGE_SHIFT_4K;
/* Initialize the common IOMMU code */
|