[deliverable/linux.git] / arch / powerpc / include / asm / iommu.h

/*
 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
 * Rewrite, cleanup:
 * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
 * 
 * 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
 */

#ifndef _ASM_IOMMU_H
#define _ASM_IOMMU_H
#ifdef __KERNEL__

#include <linux/compiler.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/bitops.h>
#include <asm/machdep.h>
#include <asm/types.h>

#define IOMMU_PAGE_SHIFT      12
#define IOMMU_PAGE_SIZE       (ASM_CONST(1) << IOMMU_PAGE_SHIFT)
#define IOMMU_PAGE_MASK       (~((1 << IOMMU_PAGE_SHIFT) - 1))
#define IOMMU_PAGE_ALIGN(addr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE)

/* Boot time flags */
extern int iommu_is_off;
extern int iommu_force_on;

/* Pure 2^n version of get_order */
static __inline__ __attribute_const__ int get_iommu_order(unsigned long size)
{
	return __ilog2((size - 1) >> IOMMU_PAGE_SHIFT) + 1;
}


/*
 * IOMAP_MAX_ORDER defines the largest contiguous block
 * of dma space we can get.  IOMAP_MAX_ORDER = 13
 * allows up to 2**12 pages (4096 * 4096) = 16 MB
 */
#define IOMAP_MAX_ORDER		13

struct iommu_table {
	unsigned long  it_busno;     /* Bus number this table belongs to */
	unsigned long  it_size;      /* Size of iommu table in entries */
	unsigned long  it_offset;    /* Offset into global table */
	unsigned long  it_base;      /* mapped address of tce table */
	unsigned long  it_index;     /* which iommu table this is */
	unsigned long  it_type;      /* type: PCI or Virtual Bus */
	unsigned long  it_blocksize; /* Entries in each block (cacheline) */
	unsigned long  it_hint;      /* Hint for next alloc */
	unsigned long  it_largehint; /* Hint for large allocs */
	unsigned long  it_halfpoint; /* Breaking point for small/large allocs */
	spinlock_t     it_lock;      /* Protects it_map */
	unsigned long *it_map;       /* A simple allocation bitmap for now */
};

struct scatterlist;

/* Frees table for an individual device node */
extern void iommu_free_table(struct iommu_table *tbl, const char *node_name);

/* Initializes an iommu_table based in values set in the passed-in
 * structure
 */
extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
					    int nid);

extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
			struct scatterlist *sglist, int nelems,
			unsigned long mask, enum dma_data_direction direction,
			struct dma_attrs *attrs);
extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
			   int nelems, enum dma_data_direction direction,
			   struct dma_attrs *attrs);

extern void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl,
				  size_t size, dma_addr_t *dma_handle,
				  unsigned long mask, gfp_t flag, int node);
extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
				void *vaddr, dma_addr_t dma_handle);
extern dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl,
				 struct page *page, unsigned long offset,
				 size_t size, unsigned long mask,
				 enum dma_data_direction direction,
				 struct dma_attrs *attrs);
extern void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle,
			     size_t size, enum dma_data_direction direction,
			     struct dma_attrs *attrs);

extern void iommu_init_early_pSeries(void);
extern void iommu_init_early_iSeries(void);
extern void iommu_init_early_dart(void);
extern void iommu_init_early_pasemi(void);

#ifdef CONFIG_PCI
extern void pci_iommu_init(void);
extern void pci_direct_iommu_init(void);
#else
static inline void pci_iommu_init(void) { }
#endif

extern void alloc_dart_table(void);
#if defined(CONFIG_PPC64) && defined(CONFIG_PM)
static inline void iommu_save(void)
{
	if (ppc_md.iommu_save)
		ppc_md.iommu_save();
}

static inline void iommu_restore(void)
{
	if (ppc_md.iommu_restore)
		ppc_md.iommu_restore();
}
#endif

#endif /* __KERNEL__ */
#endif /* _ASM_IOMMU_H */
Commit	Line	Data
9b6b563c PM	1	/*
	2	* Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
	3	* Rewrite, cleanup:
91f14480	4	* Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
9b6b563c PM	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20
	21	#ifndef _ASM_IOMMU_H
	22	#define _ASM_IOMMU_H
88ced031	23	#ifdef __KERNEL__
9b6b563c	24
5d2efba6	25	#include <linux/compiler.h>
9b6b563c PM	26	#include <linux/spinlock.h>
	27	#include <linux/device.h>
	28	#include <linux/dma-mapping.h>
1977f032	29	#include <linux/bitops.h>
7e11580b	30	#include <asm/machdep.h>
5d2efba6	31	#include <asm/types.h>
5d2efba6 LV	32
	33	#define IOMMU_PAGE_SHIFT 12
	34	#define IOMMU_PAGE_SIZE (ASM_CONST(1) << IOMMU_PAGE_SHIFT)
	35	#define IOMMU_PAGE_MASK (~((1 << IOMMU_PAGE_SHIFT) - 1))
	36	#define IOMMU_PAGE_ALIGN(addr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE)
	37
165785e5 JK	38	/* Boot time flags */
	39	extern int iommu_is_off;
	40	extern int iommu_force_on;
5d2efba6 LV	41
	42	/* Pure 2^n version of get_order */
	43	static __inline__ __attribute_const__ int get_iommu_order(unsigned long size)
	44	{
	45	return __ilog2((size - 1) >> IOMMU_PAGE_SHIFT) + 1;
	46	}
	47
9b6b563c PM	48
	49	/*
	50	* IOMAP_MAX_ORDER defines the largest contiguous block
	51	* of dma space we can get. IOMAP_MAX_ORDER = 13
	52	* allows up to 2*12 pages (4096 4096) = 16 MB
	53	*/
5d2efba6	54	#define IOMAP_MAX_ORDER 13
9b6b563c PM	55
	56	struct iommu_table {
	57	unsigned long it_busno; /* Bus number this table belongs to */
	58	unsigned long it_size; /* Size of iommu table in entries */
	59	unsigned long it_offset; /* Offset into global table */
	60	unsigned long it_base; /* mapped address of tce table */
	61	unsigned long it_index; /* which iommu table this is */
	62	unsigned long it_type; /* type: PCI or Virtual Bus */
	63	unsigned long it_blocksize; /* Entries in each block (cacheline) */
	64	unsigned long it_hint; /* Hint for next alloc */
	65	unsigned long it_largehint; /* Hint for large allocs */
	66	unsigned long it_halfpoint; /* Breaking point for small/large allocs */
	67	spinlock_t it_lock; /* Protects it_map */
	68	unsigned long it_map; / A simple allocation bitmap for now */
	69	};
	70
	71	struct scatterlist;
9b6b563c	72
9b6b563c	73	/* Frees table for an individual device node */
68d315f5	74	extern void iommu_free_table(struct iommu_table tbl, const char node_name);
9b6b563c	75
9b6b563c PM	76	/* Initializes an iommu_table based in values set in the passed-in
	77	* structure
	78	*/
ca1588e7 AB	79	extern struct iommu_table iommu_init_table(struct iommu_table tbl,
ca1588e7 AB	80	int nid);
9b6b563c	81
c8692362 MN	82	extern int iommu_map_sg(struct device dev, struct iommu_table tbl,
c8692362 MN	83	struct scatterlist *sglist, int nelems,
3affedc4 MN	84	unsigned long mask, enum dma_data_direction direction,
3affedc4 MN	85	struct dma_attrs *attrs);
9b6b563c	86	extern void iommu_unmap_sg(struct iommu_table tbl, struct scatterlist sglist,
3affedc4 MN	87	int nelems, enum dma_data_direction direction,
3affedc4 MN	88	struct dma_attrs *attrs);
9b6b563c	89
fb3475e9 FT	90	extern void iommu_alloc_coherent(struct device dev, struct iommu_table *tbl,
	91	size_t size, dma_addr_t *dma_handle,
	92	unsigned long mask, gfp_t flag, int node);
9b6b563c	93	extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
12d04eef	94	void *vaddr, dma_addr_t dma_handle);
f9226d57 MN	95	extern dma_addr_t iommu_map_page(struct device dev, struct iommu_table tbl,
	96	struct page *page, unsigned long offset,
	97	size_t size, unsigned long mask,
	98	enum dma_data_direction direction,
	99	struct dma_attrs *attrs);
	100	extern void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle,
	101	size_t size, enum dma_data_direction direction,
	102	struct dma_attrs *attrs);
9b6b563c PM	103
	104	extern void iommu_init_early_pSeries(void);
	105	extern void iommu_init_early_iSeries(void);
1beb6a7d	106	extern void iommu_init_early_dart(void);
31c56d82	107	extern void iommu_init_early_pasemi(void);
9b6b563c PM	108
	109	#ifdef CONFIG_PCI
	110	extern void pci_iommu_init(void);
	111	extern void pci_direct_iommu_init(void);
	112	#else
	113	static inline void pci_iommu_init(void) { }
	114	#endif
	115
1beb6a7d	116	extern void alloc_dart_table(void);
7e11580b JB	117	#if defined(CONFIG_PPC64) && defined(CONFIG_PM)
	118	static inline void iommu_save(void)
	119	{
	120	if (ppc_md.iommu_save)
	121	ppc_md.iommu_save();
	122	}
	123
	124	static inline void iommu_restore(void)
	125	{
	126	if (ppc_md.iommu_restore)
	127	ppc_md.iommu_restore();
	128	}
	129	#endif
9b6b563c	130
88ced031	131	#endif /* __KERNEL__ */
9b6b563c	132	#endif /* _ASM_IOMMU_H */