linux/drivers/net/ipa/ipa.h

/* SPDX-License-Identifier: GPL-2.0 */

/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
 * Copyright (C) 2018-2020 Linaro Ltd.
 */
#ifndef _IPA_H_
#define _IPA_H_

#include <linux/types.h>
#include <linux/device.h>
#include <linux/notifier.h>
#include <linux/pm_wakeup.h>

#include "ipa_version.h"
#include "gsi.h"
#include "ipa_mem.h"
#include "ipa_qmi.h"
#include "ipa_endpoint.h"
#include "ipa_interrupt.h"

struct clk;
struct icc_path;
struct net_device;
struct platform_device;

struct ipa_clock;
struct ipa_smp2p;
struct ipa_interrupt;

/**
 * enum ipa_flag - IPA state flags
 * @IPA_FLAG_RESUMED:	Whether resume from suspend has been signaled
 * @IPA_FLAG_COUNT:	Number of defined IPA flags
 */
enum ipa_flag {
	IPA_FLAG_RESUMED,
	IPA_FLAG_COUNT,		/* Last; not a flag */
};

/**
 * struct ipa - IPA information
 * @gsi:		Embedded GSI structure
 * @flags:		Boolean state flags
 * @version:		IPA hardware version
 * @pdev:		Platform device
 * @completion:		Used to signal pipeline clear transfer complete
 * @smp2p:		SMP2P information
 * @clock:		IPA clocking information
 * @table_addr:		DMA address of filter/route table content
 * @table_virt:		Virtual address of filter/route table content
 * @interrupt:		IPA Interrupt information
 * @uc_loaded:		true after microcontroller has reported it's ready
 * @reg_addr:		DMA address used for IPA register access
 * @reg_virt:		Virtual address used for IPA register access
 * @mem_addr:		DMA address of IPA-local memory space
 * @mem_virt:		Virtual address of IPA-local memory space
 * @mem_offset:		Offset from @mem_virt used for access to IPA memory
 * @mem_size:		Total size (bytes) of memory at @mem_virt
 * @mem:		Array of IPA-local memory region descriptors
 * @imem_iova:		I/O virtual address of IPA region in IMEM
 * @imem_size;		Size of IMEM region
 * @smem_iova:		I/O virtual address of IPA region in SMEM
 * @smem_size;		Size of SMEM region
 * @zero_addr:		DMA address of preallocated zero-filled memory
 * @zero_virt:		Virtual address of preallocated zero-filled memory
 * @zero_size:		Size (bytes) of preallocated zero-filled memory
 * @wakeup_source:	Wakeup source information
 * @available:		Bit mask indicating endpoints hardware supports
 * @filter_map:		Bit mask indicating endpoints that support filtering
 * @initialized:	Bit mask indicating endpoints initialized
 * @set_up:		Bit mask indicating endpoints set up
 * @enabled:		Bit mask indicating endpoints enabled
 * @endpoint:		Array of endpoint information
 * @channel_map:	Mapping of GSI channel to IPA endpoint
 * @name_map:		Mapping of IPA endpoint name to IPA endpoint
 * @setup_complete:	Flag indicating whether setup stage has completed
 * @modem_state:	State of modem (stopped, running)
 * @modem_netdev:	Network device structure used for modem
 * @qmi:		QMI information
 */
struct ipa {
	struct gsi gsi;
	DECLARE_BITMAP(flags, IPA_FLAG_COUNT);
	enum ipa_version version;
	struct platform_device *pdev;
	struct completion completion;
	struct notifier_block nb;
	void *notifier;
	struct ipa_smp2p *smp2p;
	struct ipa_clock *clock;

	dma_addr_t table_addr;
	__le64 *table_virt;

	struct ipa_interrupt *interrupt;
	bool uc_loaded;

	dma_addr_t reg_addr;
	void __iomem *reg_virt;

	dma_addr_t mem_addr;
	void *mem_virt;
	u32 mem_offset;
	u32 mem_size;
	const struct ipa_mem *mem;

	unsigned long imem_iova;
	size_t imem_size;

	unsigned long smem_iova;
	size_t smem_size;

	dma_addr_t zero_addr;
	void *zero_virt;
	size_t zero_size;

	/* Bit masks indicating endpoint state */
	u32 available;		/* supported by hardware */
	u32 filter_map;
	u32 initialized;
	u32 set_up;
	u32 enabled;

	struct ipa_endpoint endpoint[IPA_ENDPOINT_MAX];
	struct ipa_endpoint *channel_map[GSI_CHANNEL_COUNT_MAX];
	struct ipa_endpoint *name_map[IPA_ENDPOINT_COUNT];

	bool setup_complete;

	atomic_t modem_state;		/* enum ipa_modem_state */
	struct net_device *modem_netdev;
	struct ipa_qmi qmi;
};

/**
 * ipa_setup() - Perform IPA setup
 * @ipa:		IPA pointer
 *
 * IPA initialization is broken into stages:  init; config; and setup.
 * (These have inverses exit, deconfig, and teardown.)
 *
 * Activities performed at the init stage can be done without requiring
 * any access to IPA hardware.  Activities performed at the config stage
 * require the IPA clock to be running, because they involve access
 * to IPA registers.  The setup stage is performed only after the GSI
 * hardware is ready (more on this below).  The setup stage allows
 * the AP to perform more complex initialization by issuing "immediate
 * commands" using a special interface to the IPA.
 *
 * This function, @ipa_setup(), starts the setup stage.
 *
 * In order for the GSI hardware to be functional it needs firmware to be
 * loaded (in addition to some other low-level initialization).  This early
 * GSI initialization can be done either by Trust Zone on the AP or by the
 * modem.
 *
 * If it's done by Trust Zone, the AP loads the GSI firmware and supplies
 * it to Trust Zone to verify and install.  When this completes, if
 * verification was successful, the GSI layer is ready and ipa_setup()
 * implements the setup phase of initialization.
 *
 * If the modem performs early GSI initialization, the AP needs to know
 * when this has occurred.  An SMP2P interrupt is used for this purpose,
 * and receipt of that interrupt triggers the call to ipa_setup().
 */
int ipa_setup(struct ipa *ipa);

#endif /* _IPA_H_ */