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kernel-ark/arch/ppc64/kernel/bpa_iommu.c
Al Viro dd0fc66fb3 [PATCH] gfp flags annotations - part 1 
- added typedef unsigned int __nocast gfp_t;

 - replaced __nocast uses for gfp flags with gfp_t - it gives exactly
   the same warnings as far as sparse is concerned, doesn't change
   generated code (from gcc point of view we replaced unsigned int with
   typedef) and documents what's going on far better.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-08 15:00:57 -07:00

382 lines
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C
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/*
* IOMMU implementation for Broadband Processor Architecture
* We just establish a linear mapping at boot by setting all the
* IOPT cache entries in the CPU.
* The mapping functions should be identical to pci_direct_iommu,
* except for the handling of the high order bit that is required
* by the Spider bridge. These should be split into a separate
* file at the point where we get a different bridge chip.
*
* Copyright (C) 2005 IBM Deutschland Entwicklung GmbH,
* Arnd Bergmann <arndb@de.ibm.com>
*
* Based on linear mapping
* Copyright (C) 2003 Benjamin Herrenschmidt (benh@kernel.crashing.org)
*
* 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.
*/
#undef DEBUG
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/mm.h>
#include <linux/dma-mapping.h>
#include <asm/sections.h>
#include <asm/iommu.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/abs_addr.h>
#include <asm/system.h>
#include "pci.h"
#include "bpa_iommu.h"
static inline unsigned long
get_iopt_entry(unsigned long real_address, unsigned long ioid,
unsigned long prot)
{
return (prot & IOPT_PROT_MASK)
| (IOPT_COHERENT)
| (IOPT_ORDER_VC)
| (real_address & IOPT_RPN_MASK)
| (ioid & IOPT_IOID_MASK);
}
typedef struct {
unsigned long val;
} ioste;
static inline ioste
mk_ioste(unsigned long val)
{
ioste ioste = { .val = val, };
return ioste;
}
static inline ioste
get_iost_entry(unsigned long iopt_base, unsigned long io_address, unsigned page_size)
{
unsigned long ps;
unsigned long iostep;
unsigned long nnpt;
unsigned long shift;
switch (page_size) {
case 0x1000000:
ps = IOST_PS_16M;
nnpt = 0; /* one page per segment */
shift = 5; /* segment has 16 iopt entries */
break;
case 0x100000:
ps = IOST_PS_1M;
nnpt = 0; /* one page per segment */
shift = 1; /* segment has 256 iopt entries */
break;
case 0x10000:
ps = IOST_PS_64K;
nnpt = 0x07; /* 8 pages per io page table */
shift = 0; /* all entries are used */
break;
case 0x1000:
ps = IOST_PS_4K;
nnpt = 0x7f; /* 128 pages per io page table */
shift = 0; /* all entries are used */
break;
default: /* not a known compile time constant */
{
/* BUILD_BUG_ON() is not usable here */
extern void __get_iost_entry_bad_page_size(void);
__get_iost_entry_bad_page_size();
}
break;
}
iostep = iopt_base +
/* need 8 bytes per iopte */
(((io_address / page_size * 8)
/* align io page tables on 4k page boundaries */
<< shift)
/* nnpt+1 pages go into each iopt */
& ~(nnpt << 12));
nnpt++; /* this seems to work, but the documentation is not clear
about wether we put nnpt or nnpt-1 into the ioste bits.
In theory, this can't work for 4k pages. */
return mk_ioste(IOST_VALID_MASK
| (iostep & IOST_PT_BASE_MASK)
| ((nnpt << 5) & IOST_NNPT_MASK)
| (ps & IOST_PS_MASK));
}
/* compute the address of an io pte */
static inline unsigned long
get_ioptep(ioste iost_entry, unsigned long io_address)
{
unsigned long iopt_base;
unsigned long page_size;
unsigned long page_number;
unsigned long iopt_offset;
iopt_base = iost_entry.val & IOST_PT_BASE_MASK;
page_size = iost_entry.val & IOST_PS_MASK;
/* decode page size to compute page number */
page_number = (io_address & 0x0fffffff) >> (10 + 2 * page_size);
/* page number is an offset into the io page table */
iopt_offset = (page_number << 3) & 0x7fff8ul;
return iopt_base + iopt_offset;
}
/* compute the tag field of the iopt cache entry */
static inline unsigned long
get_ioc_tag(ioste iost_entry, unsigned long io_address)
{
unsigned long iopte = get_ioptep(iost_entry, io_address);
return IOPT_VALID_MASK
| ((iopte & 0x00000000000000ff8ul) >> 3)
| ((iopte & 0x0000003fffffc0000ul) >> 9);
}
/* compute the hashed 6 bit index for the 4-way associative pte cache */
static inline unsigned long
get_ioc_hash(ioste iost_entry, unsigned long io_address)
{
unsigned long iopte = get_ioptep(iost_entry, io_address);
return ((iopte & 0x000000000000001f8ul) >> 3)
^ ((iopte & 0x00000000000020000ul) >> 17)
^ ((iopte & 0x00000000000010000ul) >> 15)
^ ((iopte & 0x00000000000008000ul) >> 13)
^ ((iopte & 0x00000000000004000ul) >> 11)
^ ((iopte & 0x00000000000002000ul) >> 9)
^ ((iopte & 0x00000000000001000ul) >> 7);
}
/* same as above, but pretend that we have a simpler 1-way associative
pte cache with an 8 bit index */
static inline unsigned long
get_ioc_hash_1way(ioste iost_entry, unsigned long io_address)
{
unsigned long iopte = get_ioptep(iost_entry, io_address);
return ((iopte & 0x000000000000001f8ul) >> 3)
^ ((iopte & 0x00000000000020000ul) >> 17)
^ ((iopte & 0x00000000000010000ul) >> 15)
^ ((iopte & 0x00000000000008000ul) >> 13)
^ ((iopte & 0x00000000000004000ul) >> 11)
^ ((iopte & 0x00000000000002000ul) >> 9)
^ ((iopte & 0x00000000000001000ul) >> 7)
^ ((iopte & 0x0000000000000c000ul) >> 8);
}
static inline ioste
get_iost_cache(void __iomem *base, unsigned long index)
{
unsigned long __iomem *p = (base + IOC_ST_CACHE_DIR);
return mk_ioste(in_be64(&p[index]));
}
static inline void
set_iost_cache(void __iomem *base, unsigned long index, ioste ste)
{
unsigned long __iomem *p = (base + IOC_ST_CACHE_DIR);
pr_debug("ioste %02lx was %016lx, store %016lx", index,
get_iost_cache(base, index).val, ste.val);
out_be64(&p[index], ste.val);
pr_debug(" now %016lx\n", get_iost_cache(base, index).val);
}
static inline unsigned long
get_iopt_cache(void __iomem *base, unsigned long index, unsigned long *tag)
{
unsigned long __iomem *tags = (void *)(base + IOC_PT_CACHE_DIR);
unsigned long __iomem *p = (void *)(base + IOC_PT_CACHE_REG);
*tag = tags[index];
rmb();
return *p;
}
static inline void
set_iopt_cache(void __iomem *base, unsigned long index,
unsigned long tag, unsigned long val)
{
unsigned long __iomem *tags = base + IOC_PT_CACHE_DIR;
unsigned long __iomem *p = base + IOC_PT_CACHE_REG;
pr_debug("iopt %02lx was v%016lx/t%016lx, store v%016lx/t%016lx\n",
index, get_iopt_cache(base, index, &oldtag), oldtag, val, tag);
out_be64(p, val);
out_be64(&tags[index], tag);
}
static inline void
set_iost_origin(void __iomem *base)
{
unsigned long __iomem *p = base + IOC_ST_ORIGIN;
unsigned long origin = IOSTO_ENABLE | IOSTO_SW;
pr_debug("iost_origin %016lx, now %016lx\n", in_be64(p), origin);
out_be64(p, origin);
}
static inline void
set_iocmd_config(void __iomem *base)
{
unsigned long __iomem *p = base + 0xc00;
unsigned long conf;
conf = in_be64(p);
pr_debug("iost_conf %016lx, now %016lx\n", conf, conf | IOCMD_CONF_TE);
out_be64(p, conf | IOCMD_CONF_TE);
}
/* FIXME: get these from the device tree */
#define ioc_base 0x20000511000ull
#define ioc_mmio_base 0x20000510000ull
#define ioid 0x48a
#define iopt_phys_offset (- 0x20000000) /* We have a 512MB offset from the SB */
#define io_page_size 0x1000000
static unsigned long map_iopt_entry(unsigned long address)
{
switch (address >> 20) {
case 0x600:
address = 0x24020000000ull; /* spider i/o */
break;
default:
address += iopt_phys_offset;
break;
}
return get_iopt_entry(address, ioid, IOPT_PROT_RW);
}
static void iommu_bus_setup_null(struct pci_bus *b) { }
static void iommu_dev_setup_null(struct pci_dev *d) { }
/* initialize the iommu to support a simple linear mapping
* for each DMA window used by any device. For now, we
* happen to know that there is only one DMA window in use,
* starting at iopt_phys_offset. */
static void bpa_map_iommu(void)
{
unsigned long address;
void __iomem *base;
ioste ioste;
unsigned long index;
base = __ioremap(ioc_base, 0x1000, _PAGE_NO_CACHE);
pr_debug("%lx mapped to %p\n", ioc_base, base);
set_iocmd_config(base);
iounmap(base);
base = __ioremap(ioc_mmio_base, 0x1000, _PAGE_NO_CACHE);
pr_debug("%lx mapped to %p\n", ioc_mmio_base, base);
set_iost_origin(base);
for (address = 0; address < 0x100000000ul; address += io_page_size) {
ioste = get_iost_entry(0x10000000000ul, address, io_page_size);
if ((address & 0xfffffff) == 0) /* segment start */
set_iost_cache(base, address >> 28, ioste);
index = get_ioc_hash_1way(ioste, address);
pr_debug("addr %08lx, index %02lx, ioste %016lx\n",
address, index, ioste.val);
set_iopt_cache(base,
get_ioc_hash_1way(ioste, address),
get_ioc_tag(ioste, address),
map_iopt_entry(address));
}
iounmap(base);
}
static void *bpa_alloc_coherent(struct device *hwdev, size_t size,
dma_addr_t *dma_handle, gfp_t flag)
{
void *ret;
ret = (void *)__get_free_pages(flag, get_order(size));
if (ret != NULL) {
memset(ret, 0, size);
*dma_handle = virt_to_abs(ret) | BPA_DMA_VALID;
}
return ret;
}
static void bpa_free_coherent(struct device *hwdev, size_t size,
void *vaddr, dma_addr_t dma_handle)
{
free_pages((unsigned long)vaddr, get_order(size));
}
static dma_addr_t bpa_map_single(struct device *hwdev, void *ptr,
size_t size, enum dma_data_direction direction)
{
return virt_to_abs(ptr) | BPA_DMA_VALID;
}
static void bpa_unmap_single(struct device *hwdev, dma_addr_t dma_addr,
size_t size, enum dma_data_direction direction)
{
}
static int bpa_map_sg(struct device *hwdev, struct scatterlist *sg,
int nents, enum dma_data_direction direction)
{
int i;
for (i = 0; i < nents; i++, sg++) {
sg->dma_address = (page_to_phys(sg->page) + sg->offset)
| BPA_DMA_VALID;
sg->dma_length = sg->length;
}
return nents;
}
static void bpa_unmap_sg(struct device *hwdev, struct scatterlist *sg,
int nents, enum dma_data_direction direction)
{
}
static int bpa_dma_supported(struct device *dev, u64 mask)
{
return mask < 0x100000000ull;
}
void bpa_init_iommu(void)
{
bpa_map_iommu();
/* Direct I/O, IOMMU off */
ppc_md.iommu_dev_setup = iommu_dev_setup_null;
ppc_md.iommu_bus_setup = iommu_bus_setup_null;
pci_dma_ops.alloc_coherent = bpa_alloc_coherent;
pci_dma_ops.free_coherent = bpa_free_coherent;
pci_dma_ops.map_single = bpa_map_single;
pci_dma_ops.unmap_single = bpa_unmap_single;
pci_dma_ops.map_sg = bpa_map_sg;
pci_dma_ops.unmap_sg = bpa_unmap_sg;
pci_dma_ops.dma_supported = bpa_dma_supported;
}
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