arch/arm/mach-msm/include/mach/iommu.h

/* Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * 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.
 */

#ifndef MSM_IOMMU_H
#define MSM_IOMMU_H

#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/list.h>
#include <linux/regulator/consumer.h>
#include <mach/socinfo.h>

extern pgprot_t     pgprot_kernel;
extern struct bus_type msm_iommu_sec_bus_type;

/* Domain attributes */
#define MSM_IOMMU_DOMAIN_PT_CACHEABLE	0x1
#define MSM_IOMMU_DOMAIN_PT_SECURE	0x2

/* Mask for the cache policy attribute */
#define MSM_IOMMU_CP_MASK		0x03

/* Maximum number of Machine IDs that we are allowing to be mapped to the same
 * context bank. The number of MIDs mapped to the same CB does not affect
 * performance, but there is a practical limit on how many distinct MIDs may
 * be present. These mappings are typically determined at design time and are
 * not expected to change at run time.
 */
#define MAX_NUM_MIDS	32

/* Maximum number of SMT entries allowed by the system */
#define MAX_NUM_SMR	128

#define MAX_NUM_BFB_REGS	32

/**
 * struct msm_iommu_dev - a single IOMMU hardware instance
 * name		Human-readable name given to this IOMMU HW instance
 * ncb		Number of context banks present on this IOMMU HW instance
 */
struct msm_iommu_dev {
	const char *name;
	int ncb;
	int ttbr_split;
};

/**
 * struct msm_iommu_ctx_dev - an IOMMU context bank instance
 * name		Human-readable name given to this context bank
 * num		Index of this context bank within the hardware
 * mids		List of Machine IDs that are to be mapped into this context
 *		bank, terminated by -1. The MID is a set of signals on the
 *		AXI bus that identifies the function associated with a specific
 *		memory request. (See ARM spec).
 */
struct msm_iommu_ctx_dev {
	const char *name;
	int num;
	int mids[MAX_NUM_MIDS];
};

/**
 * struct msm_iommu_bfb_settings - a set of IOMMU BFB tuning parameters
 * regs		An array of register offsets to configure
 * data		Values to write to corresponding registers
 * length	Number of valid entries in the offset/val arrays
 */
struct msm_iommu_bfb_settings {
	unsigned int regs[MAX_NUM_BFB_REGS];
	unsigned int data[MAX_NUM_BFB_REGS];
	int length;
};

/**
 * struct msm_iommu_drvdata - A single IOMMU hardware instance
 * @base:	IOMMU config port base address (VA)
 * @ncb		The number of contexts on this IOMMU
 * @irq:	Interrupt number
 * @clk:	The bus clock for this IOMMU hardware instance
 * @pclk:	The clock for the IOMMU bus interconnect
 * @aclk:	Alternate clock for this IOMMU core, if any
 * @name:	Human-readable name of this IOMMU device
 * @gdsc:	Regulator needed to power this HW block (v2 only)
 * @bfb_settings: Optional BFB performance tuning parameters
 * @dev:	Struct device this hardware instance is tied to
 * @list:	List head to link all iommus together
 *
 * A msm_iommu_drvdata holds the global driver data about a single piece
 * of an IOMMU hardware instance.
 */
struct msm_iommu_drvdata {
	void __iomem *base;
	int ncb;
	int ttbr_split;
	struct clk *clk;
	struct clk *pclk;
	struct clk *aclk;
	const char *name;
	struct regulator *gdsc;
	struct msm_iommu_bfb_settings *bfb_settings;
	int sec_id;
	struct device *dev;
	struct list_head list;
};

void msm_iommu_add_drv(struct msm_iommu_drvdata *drv);
void msm_iommu_remove_drv(struct msm_iommu_drvdata *drv);

/**
 * struct msm_iommu_ctx_drvdata - an IOMMU context bank instance
 * @num:		Hardware context number of this context
 * @pdev:		Platform device associated wit this HW instance
 * @attached_elm:	List element for domains to track which devices are
 *			attached to them
 * @attached_domain	Domain currently attached to this context (if any)
 * @name		Human-readable name of this context device
 * @sids		List of Stream IDs mapped to this context (v2 only)
 * @nsid		Number of Stream IDs mapped to this context (v2 only)
 *
 * A msm_iommu_ctx_drvdata holds the driver data for a single context bank
 * within each IOMMU hardware instance
 */
struct msm_iommu_ctx_drvdata {
	int num;
	struct platform_device *pdev;
	struct list_head attached_elm;
	struct iommu_domain *attached_domain;
	const char *name;
	u32 sids[MAX_NUM_SMR];
	unsigned int nsid;
};

/*
 * Interrupt handler for the IOMMU context fault interrupt. Hooking the
 * interrupt is not supported in the API yet, but this will print an error
 * message and dump useful IOMMU registers.
 */
irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id);
irqreturn_t msm_iommu_fault_handler_v2(int irq, void *dev_id);

#ifdef CONFIG_MSM_IOMMU
/*
 * Look up an IOMMU context device by its context name. NULL if none found.
 * Useful for testing and drivers that do not yet fully have IOMMU stuff in
 * their platform devices.
 */
struct device *msm_iommu_get_ctx(const char *ctx_name);
#else
static inline struct device *msm_iommu_get_ctx(const char *ctx_name)
{
	return NULL;
}
#endif

/*
 * Function to program the global registers of an IOMMU securely.
 * This should only be called on IOMMUs for which kernel programming
 * of global registers is not possible
 */
int msm_iommu_sec_program_iommu(int sec_id);

static inline int msm_soc_version_supports_iommu_v1(void)
{
#ifdef CONFIG_OF
	struct device_node *node;

	node = of_find_compatible_node(NULL, NULL, "qcom,msm-smmu-v2");
	if (node) {
		of_node_put(node);
		return 0;
	}
#endif
	if (cpu_is_msm8960() &&
	    SOCINFO_VERSION_MAJOR(socinfo_get_version()) < 2)
		return 0;

	if (cpu_is_msm8x60() &&
	    (SOCINFO_VERSION_MAJOR(socinfo_get_version()) != 2 ||
	    SOCINFO_VERSION_MINOR(socinfo_get_version()) < 1))	{
		return 0;
	}
	return 1;
}
#endif