/*
 * Copyright (c) 2006, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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.
 *
 * Copyright (C) 2006-2008 Intel Corporation
 * Author: Ashok Raj <ashok.raj@intel.com>
 * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
 */

#ifndef _INTEL_IOMMU_H_
#define _INTEL_IOMMU_H_

#include <linux/types.h>
#include <linux/iova.h>
#include <linux/io.h>
#include <linux/dma_remapping.h>
#include <asm/cacheflush.h>
#include <asm/iommu.h>

/*
 * Intel IOMMU register specification per version 1.0 public spec.
 */

#define	DMAR_VER_REG	0x0	/* Arch version supported by this IOMMU */
#define	DMAR_CAP_REG	0x8	/* Hardware supported capabilities */
#define	DMAR_ECAP_REG	0x10	/* Extended capabilities supported */
#define	DMAR_GCMD_REG	0x18	/* Global command register */
#define	DMAR_GSTS_REG	0x1c	/* Global status register */
#define	DMAR_RTADDR_REG	0x20	/* Root entry table */
#define	DMAR_CCMD_REG	0x28	/* Context command reg */
#define	DMAR_FSTS_REG	0x34	/* Fault Status register */
#define	DMAR_FECTL_REG	0x38	/* Fault control register */
#define	DMAR_FEDATA_REG	0x3c	/* Fault event interrupt data register */
#define	DMAR_FEADDR_REG	0x40	/* Fault event interrupt addr register */
#define	DMAR_FEUADDR_REG 0x44	/* Upper address register */
#define	DMAR_AFLOG_REG	0x58	/* Advanced Fault control */
#define	DMAR_PMEN_REG	0x64	/* Enable Protected Memory Region */
#define	DMAR_PLMBASE_REG 0x68	/* PMRR Low addr */
#define	DMAR_PLMLIMIT_REG 0x6c	/* PMRR low limit */
#define	DMAR_PHMBASE_REG 0x70	/* pmrr high base addr */
#define	DMAR_PHMLIMIT_REG 0x78	/* pmrr high limit */
#define DMAR_IQH_REG	0x80	/* Invalidation queue head register */
#define DMAR_IQT_REG	0x88	/* Invalidation queue tail register */
#define DMAR_IQ_SHIFT	4	/* Invalidation queue head/tail shift */
#define DMAR_IQA_REG	0x90	/* Invalidation queue addr register */
#define DMAR_ICS_REG	0x9c	/* Invalidation complete status register */
#define DMAR_IRTA_REG	0xb8    /* Interrupt remapping table addr register */

#define OFFSET_STRIDE		(9)
/*
#define dmar_readl(dmar, reg) readl(dmar + reg)
#define dmar_readq(dmar, reg) ({ \
		u32 lo, hi; \
		lo = readl(dmar + reg); \
		hi = readl(dmar + reg + 4); \
		(((u64) hi) << 32) + lo; })
*/
static inline u64 dmar_readq(void __iomem *addr)
{
	u32 lo, hi;
	lo = readl(addr);
	hi = readl(addr + 4);
	return (((u64) hi) << 32) + lo;
}

static inline void dmar_writeq(void __iomem *addr, u64 val)
{
	writel((u32)val, addr);
	writel((u32)(val >> 32), addr + 4);
}

#define DMAR_VER_MAJOR(v)		(((v) & 0xf0) >> 4)
#define DMAR_VER_MINOR(v)		((v) & 0x0f)

/*
 * Decoding Capability Register
 */
#define cap_read_drain(c)	(((c) >> 55) & 1)
#define cap_write_drain(c)	(((c) >> 54) & 1)
#define cap_max_amask_val(c)	(((c) >> 48) & 0x3f)
#define cap_num_fault_regs(c)	((((c) >> 40) & 0xff) + 1)
#define cap_pgsel_inv(c)	(((c) >> 39) & 1)

#define cap_super_page_val(c)	(((c) >> 34) & 0xf)
#define cap_super_offset(c)	(((find_first_bit(&cap_super_page_val(c), 4)) \
					* OFFSET_STRIDE) + 21)

#define cap_fault_reg_offset(c)	((((c) >> 24) & 0x3ff) * 16)
#define cap_max_fault_reg_offset(c) \
	(cap_fault_reg_offset(c) + cap_num_fault_regs(c) * 16)

#define cap_zlr(c)		(((c) >> 22) & 1)
#define cap_isoch(c)		(((c) >> 23) & 1)
#define cap_mgaw(c)		((((c) >> 16) & 0x3f) + 1)
#define cap_sagaw(c)		(((c) >> 8) & 0x1f)
#define cap_caching_mode(c)	(((c) >> 7) & 1)
#define cap_phmr(c)		(((c) >> 6) & 1)
#define cap_plmr(c)		(((c) >> 5) & 1)
#define cap_rwbf(c)		(((c) >> 4) & 1)
#define cap_afl(c)		(((c) >> 3) & 1)
#define cap_ndoms(c)		(((unsigned long)1) << (4 + 2 * ((c) & 0x7)))
/*
 * Extended Capability Register
 */

#define ecap_niotlb_iunits(e)	((((e) >> 24) & 0xff) + 1)
#define ecap_iotlb_offset(e) 	((((e) >> 8) & 0x3ff) * 16)
#define ecap_max_iotlb_offset(e) \
	(ecap_iotlb_offset(e) + ecap_niotlb_iunits(e) * 16)
#define ecap_coherent(e)	((e) & 0x1)
#define ecap_qis(e)		((e) & 0x2)
#define ecap_pass_through(e)	((e >> 6) & 0x1)
#define ecap_eim_support(e)	((e >> 4) & 0x1)
#define ecap_ir_support(e)	((e >> 3) & 0x1)
#define ecap_dev_iotlb_support(e)	(((e) >> 2) & 0x1)
#define ecap_max_handle_mask(e) ((e >> 20) & 0xf)
#define ecap_sc_support(e)	((e >> 7) & 0x1) /* Snooping Control */

/* IOTLB_REG */
#define DMA_TLB_FLUSH_GRANU_OFFSET  60
#define DMA_TLB_GLOBAL_FLUSH (((u64)1) << 60)
#define DMA_TLB_DSI_FLUSH (((u64)2) << 60)
#define DMA_TLB_PSI_FLUSH (((u64)3) << 60)
#define DMA_TLB_IIRG(type) ((type >> 60) & 7)
#define DMA_TLB_IAIG(val) (((val) >> 57) & 7)
#define DMA_TLB_READ_DRAIN (((u64)1) << 49)
#define DMA_TLB_WRITE_DRAIN (((u64)1) << 48)
#define DMA_TLB_DID(id)	(((u64)((id) & 0xffff)) << 32)
#define DMA_TLB_IVT (((u64)1) << 63)
#define DMA_TLB_IH_NONLEAF (((u64)1) << 6)
#define DMA_TLB_MAX_SIZE (0x3f)

/* INVALID_DESC */
#define DMA_CCMD_INVL_GRANU_OFFSET  61
#define DMA_ID_TLB_GLOBAL_FLUSH	(((u64)1) << 3)
#define DMA_ID_TLB_DSI_FLUSH	(((u64)2) << 3)
#define DMA_ID_TLB_PSI_FLUSH	(((u64)3) << 3)
#define DMA_ID_TLB_READ_DRAIN	(((u64)1) << 7)
#define DMA_ID_TLB_WRITE_DRAIN	(((u64)1) << 6)
#define DMA_ID_TLB_DID(id)	(((u64)((id & 0xffff) << 16)))
#define DMA_ID_TLB_IH_NONLEAF	(((u64)1) << 6)
#define DMA_ID_TLB_ADDR(addr)	(addr)
#define DMA_ID_TLB_ADDR_MASK(mask)	(mask)

/* PMEN_REG */
#define DMA_PMEN_EPM (((u32)1)<<31)
#define DMA_PMEN_PRS (((u32)1)<<0)

/* GCMD_REG */
#define DMA_GCMD_TE (((u32)1) << 31)
#define DMA_GCMD_SRTP (((u32)1) << 30)
#define DMA_GCMD_SFL (((u32)1) << 29)
#define DMA_GCMD_EAFL (((u32)1) << 28)
#define DMA_GCMD_WBF (((u32)1) << 27)
#define DMA_GCMD_QIE (((u32)1) << 26)
#define DMA_GCMD_SIRTP (((u32)1) << 24)
#define DMA_GCMD_IRE (((u32) 1) << 25)
#define DMA_GCMD_CFI (((u32) 1) << 23)

/* GSTS_REG */
#define DMA_GSTS_TES (((u32)1) << 31)
#define DMA_GSTS_RTPS (((u32)1) << 30)
#define DMA_GSTS_FLS (((u32)1) << 29)
#define DMA_GSTS_AFLS (((u32)1) << 28)
#define DMA_GSTS_WBFS (((u32)1) << 27)
#define DMA_GSTS_QIES (((u32)1) << 26)
#define DMA_GSTS_IRTPS (((u32)1) << 24)
#define DMA_GSTS_IRES (((u32)1) << 25)
#define DMA_GSTS_CFIS (((u32)1) << 23)

/* CCMD_REG */
#define DMA_CCMD_ICC (((u64)1) << 63)
#define DMA_CCMD_GLOBAL_INVL (((u64)1) << 61)
#define DMA_CCMD_DOMAIN_INVL (((u64)2) << 61)
#define DMA_CCMD_DEVICE_INVL (((u64)3) << 61)
#define DMA_CCMD_FM(m) (((u64)((m) & 0x3)) << 32)
#define DMA_CCMD_MASK_NOBIT 0
#define DMA_CCMD_MASK_1BIT 1
#define DMA_CCMD_MASK_2BIT 2
#define DMA_CCMD_MASK_3BIT 3
#define DMA_CCMD_SID(s) (((u64)((s) & 0xffff)) << 16)
#define DMA_CCMD_DID(d) ((u64)((d) & 0xffff))

/* FECTL_REG */
#define DMA_FECTL_IM (((u32)1) << 31)

/* FSTS_REG */
#define DMA_FSTS_PPF ((u32)2)
#define DMA_FSTS_PFO ((u32)1)
#define DMA_FSTS_IQE (1 << 4)
#define DMA_FSTS_ICE (1 << 5)
#define DMA_FSTS_ITE (1 << 6)
#define dma_fsts_fault_record_index(s) (((s) >> 8) & 0xff)

/* FRCD_REG, 32 bits access */
#define DMA_FRCD_F (((u32)1) << 31)
#define dma_frcd_type(d) ((d >> 30) & 1)
#define dma_frcd_fault_reason(c) (c & 0xff)
#define dma_frcd_source_id(c) (c & 0xffff)
/* low 64 bit */
#define dma_frcd_page_addr(d) (d & (((u64)-1) << PAGE_SHIFT))

#define IOMMU_WAIT_OP(iommu, offset, op, cond, sts)			\
do {									\
	cycles_t start_time = get_cycles();				\
	while (1) {							\
		sts = op(iommu->reg + offset);				\
		if (cond)						\
			break;						\
		if (DMAR_OPERATION_TIMEOUT < (get_cycles() - start_time))\
			panic("DMAR hardware is malfunctioning\n");	\
		cpu_relax();						\
	}								\
} while (0)

#define QI_LENGTH	256	/* queue length */

enum {
	QI_FREE,
	QI_IN_USE,
	QI_DONE,
	QI_ABORT
};

#define QI_CC_TYPE		0x1
#define QI_IOTLB_TYPE		0x2
#define QI_DIOTLB_TYPE		0x3
#define QI_IEC_TYPE		0x4
#define QI_IWD_TYPE		0x5

#define QI_IEC_SELECTIVE	(((u64)1) << 4)
#define QI_IEC_IIDEX(idx)	(((u64)(idx & 0xffff) << 32))
#define QI_IEC_IM(m)		(((u64)(m & 0x1f) << 27))

#define QI_IWD_STATUS_DATA(d)	(((u64)d) << 32)
#define QI_IWD_STATUS_WRITE	(((u64)1) << 5)

#define QI_IOTLB_DID(did) 	(((u64)did) << 16)
#define QI_IOTLB_DR(dr) 	(((u64)dr) << 7)
#define QI_IOTLB_DW(dw) 	(((u64)dw) << 6)
#define QI_IOTLB_GRAN(gran) 	(((u64)gran) >> (DMA_TLB_FLUSH_GRANU_OFFSET-4))
#define QI_IOTLB_ADDR(addr)	(((u64)addr) & VTD_PAGE_MASK)
#define QI_IOTLB_IH(ih)		(((u64)ih) << 6)
#define QI_IOTLB_AM(am)		(((u8)am))

#define QI_CC_FM(fm)		(((u64)fm) << 48)
#define QI_CC_SID(sid)		(((u64)sid) << 32)
#define QI_CC_DID(did)		(((u64)did) << 16)
#define QI_CC_GRAN(gran)	(((u64)gran) >> (DMA_CCMD_INVL_GRANU_OFFSET-4))

#define QI_DEV_IOTLB_SID(sid)	((u64)((sid) & 0xffff) << 32)
#define QI_DEV_IOTLB_QDEP(qdep)	(((qdep) & 0x1f) << 16)
#define QI_DEV_IOTLB_ADDR(addr)	((u64)(addr) & VTD_PAGE_MASK)
#define QI_DEV_IOTLB_SIZE	1
#define QI_DEV_IOTLB_MAX_INVS	32

struct qi_desc {
	u64 low, high;
};

struct q_inval {
	raw_spinlock_t  q_lock;
	struct qi_desc  *desc;          /* invalidation queue */
	int             *desc_status;   /* desc status */
	int             free_head;      /* first free entry */
	int             free_tail;      /* last free entry */
	int             free_cnt;
};

#ifdef CONFIG_IRQ_REMAP
/* 1MB - maximum possible interrupt remapping table size */
#define INTR_REMAP_PAGE_ORDER	8
#define INTR_REMAP_TABLE_REG_SIZE	0xf

#define INTR_REMAP_TABLE_ENTRIES	65536

struct ir_table {
	struct irte *base;
};
#endif

struct iommu_flush {
	void (*flush_context)(struct intel_iommu *iommu, u16 did, u16 sid,
			      u8 fm, u64 type);
	void (*flush_iotlb)(struct intel_iommu *iommu, u16 did, u64 addr,
			    unsigned int size_order, u64 type);
};

enum {
	SR_DMAR_FECTL_REG,
	SR_DMAR_FEDATA_REG,
	SR_DMAR_FEADDR_REG,
	SR_DMAR_FEUADDR_REG,
	MAX_SR_DMAR_REGS
};

struct intel_iommu {
	void __iomem	*reg; /* Pointer to hardware regs, virtual addr */
	u64 		reg_phys; /* physical address of hw register set */
	u64		reg_size; /* size of hw register set */
	u64		cap;
	u64		ecap;
	u32		gcmd; /* Holds TE, EAFL. Don't need SRTP, SFL, WBF */
	raw_spinlock_t	register_lock; /* protect register handling */
	int		seq_id;	/* sequence id of the iommu */
	int		agaw; /* agaw of this iommu */
	int		msagaw; /* max sagaw of this iommu */
	unsigned int 	irq;
	unsigned char 	name[13];    /* Device Name */

#ifdef CONFIG_INTEL_IOMMU
	unsigned long 	*domain_ids; /* bitmap of domains */
	struct dmar_domain **domains; /* ptr to domains */
	spinlock_t	lock; /* protect context, domain ids */
	struct root_entry *root_entry; /* virtual address */

	struct iommu_flush flush;
#endif
	struct q_inval  *qi;            /* Queued invalidation info */
	u32 *iommu_state; /* Store iommu states between suspend and resume.*/

#ifdef CONFIG_IRQ_REMAP
	struct ir_table *ir_table;	/* Interrupt remapping info */
#endif
	int		node;
};

static inline void __iommu_flush_cache(
	struct intel_iommu *iommu, void *addr, int size)
{
	if (!ecap_coherent(iommu->ecap))
		clflush_cache_range(addr, size);
}

extern struct dmar_drhd_unit * dmar_find_matched_drhd_unit(struct pci_dev *dev);
extern int dmar_find_matched_atsr_unit(struct pci_dev *dev);

extern int alloc_iommu(struct dmar_drhd_unit *drhd);
extern void free_iommu(struct intel_iommu *iommu);
extern int dmar_enable_qi(struct intel_iommu *iommu);
extern void dmar_disable_qi(struct intel_iommu *iommu);
extern int dmar_reenable_qi(struct intel_iommu *iommu);
extern void qi_global_iec(struct intel_iommu *iommu);

extern void qi_flush_context(struct intel_iommu *iommu, u16 did, u16 sid,
			     u8 fm, u64 type);
extern void qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr,
			  unsigned int size_order, u64 type);
extern void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 qdep,
			       u64 addr, unsigned mask);

extern int qi_submit_sync(struct qi_desc *desc, struct intel_iommu *iommu);

extern int dmar_ir_support(void);

#endif
