xref: /kernel/linux/linux-5.10/include/linux/host1x.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (c) 2009-2013, NVIDIA Corporation. All rights reserved.
 */

#ifndef __LINUX_HOST1X_H
#define __LINUX_HOST1X_H

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

enum host1x_class {
	HOST1X_CLASS_HOST1X = 0x1,
	HOST1X_CLASS_GR2D = 0x51,
	HOST1X_CLASS_GR2D_SB = 0x52,
	HOST1X_CLASS_VIC = 0x5D,
	HOST1X_CLASS_GR3D = 0x60,
};

struct host1x;
struct host1x_client;
struct iommu_group;

u64 host1x_get_dma_mask(struct host1x *host1x);

/**
 * struct host1x_client_ops - host1x client operations
 * @init: host1x client initialization code
 * @exit: host1x client tear down code
 * @suspend: host1x client suspend code
 * @resume: host1x client resume code
 */
struct host1x_client_ops {
	int (*init)(struct host1x_client *client);
	int (*exit)(struct host1x_client *client);
	int (*suspend)(struct host1x_client *client);
	int (*resume)(struct host1x_client *client);
};

/**
 * struct host1x_client - host1x client structure
 * @list: list node for the host1x client
 * @host: pointer to struct device representing the host1x controller
 * @dev: pointer to struct device backing this host1x client
 * @group: IOMMU group that this client is a member of
 * @ops: host1x client operations
 * @class: host1x class represented by this client
 * @channel: host1x channel associated with this client
 * @syncpts: array of syncpoints requested for this client
 * @num_syncpts: number of syncpoints requested for this client
 * @parent: pointer to parent structure
 * @usecount: reference count for this structure
 * @lock: mutex for mutually exclusive concurrency
 */
struct host1x_client {
	struct list_head list;
	struct device *host;
	struct device *dev;
	struct iommu_group *group;

	const struct host1x_client_ops *ops;

	enum host1x_class class;
	struct host1x_channel *channel;

	struct host1x_syncpt **syncpts;
	unsigned int num_syncpts;

	struct host1x_client *parent;
	unsigned int usecount;
	struct mutex lock;
};

/*
 * host1x buffer objects
 */

struct host1x_bo;
struct sg_table;

struct host1x_bo_ops {
	struct host1x_bo *(*get)(struct host1x_bo *bo);
	void (*put)(struct host1x_bo *bo);
	struct sg_table *(*pin)(struct device *dev, struct host1x_bo *bo,
				dma_addr_t *phys);
	void (*unpin)(struct device *dev, struct sg_table *sgt);
	void *(*mmap)(struct host1x_bo *bo);
	void (*munmap)(struct host1x_bo *bo, void *addr);
};

struct host1x_bo {
	const struct host1x_bo_ops *ops;
};

static inline void host1x_bo_init(struct host1x_bo *bo,
				  const struct host1x_bo_ops *ops)
{
	bo->ops = ops;
}

static inline struct host1x_bo *host1x_bo_get(struct host1x_bo *bo)
{
	return bo->ops->get(bo);
}

static inline void host1x_bo_put(struct host1x_bo *bo)
{
	bo->ops->put(bo);
}

static inline struct sg_table *host1x_bo_pin(struct device *dev,
					     struct host1x_bo *bo,
					     dma_addr_t *phys)
{
	return bo->ops->pin(dev, bo, phys);
}

static inline void host1x_bo_unpin(struct device *dev, struct host1x_bo *bo,
				   struct sg_table *sgt)
{
	bo->ops->unpin(dev, sgt);
}

static inline void *host1x_bo_mmap(struct host1x_bo *bo)
{
	return bo->ops->mmap(bo);
}

static inline void host1x_bo_munmap(struct host1x_bo *bo, void *addr)
{
	bo->ops->munmap(bo, addr);
}

/*
 * host1x syncpoints
 */

#define HOST1X_SYNCPT_CLIENT_MANAGED	(1 << 0)
#define HOST1X_SYNCPT_HAS_BASE		(1 << 1)

struct host1x_syncpt_base;
struct host1x_syncpt;
struct host1x;

struct host1x_syncpt *host1x_syncpt_get(struct host1x *host, u32 id);
u32 host1x_syncpt_id(struct host1x_syncpt *sp);
u32 host1x_syncpt_read_min(struct host1x_syncpt *sp);
u32 host1x_syncpt_read_max(struct host1x_syncpt *sp);
u32 host1x_syncpt_read(struct host1x_syncpt *sp);
int host1x_syncpt_incr(struct host1x_syncpt *sp);
u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs);
int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh, long timeout,
		       u32 *value);
struct host1x_syncpt *host1x_syncpt_request(struct host1x_client *client,
					    unsigned long flags);
void host1x_syncpt_free(struct host1x_syncpt *sp);

struct host1x_syncpt_base *host1x_syncpt_get_base(struct host1x_syncpt *sp);
u32 host1x_syncpt_base_id(struct host1x_syncpt_base *base);

/*
 * host1x channel
 */

struct host1x_channel;
struct host1x_job;

struct host1x_channel *host1x_channel_request(struct host1x_client *client);
struct host1x_channel *host1x_channel_get(struct host1x_channel *channel);
void host1x_channel_put(struct host1x_channel *channel);
int host1x_job_submit(struct host1x_job *job);

/*
 * host1x job
 */

#define HOST1X_RELOC_READ	(1 << 0)
#define HOST1X_RELOC_WRITE	(1 << 1)

struct host1x_reloc {
	struct {
		struct host1x_bo *bo;
		unsigned long offset;
	} cmdbuf;
	struct {
		struct host1x_bo *bo;
		unsigned long offset;
	} target;
	unsigned long shift;
	unsigned long flags;
};

struct host1x_job {
	/* When refcount goes to zero, job can be freed */
	struct kref ref;

	/* List entry */
	struct list_head list;

	/* Channel where job is submitted to */
	struct host1x_channel *channel;

	/* client where the job originated */
	struct host1x_client *client;

	/* Gathers and their memory */
	struct host1x_job_gather *gathers;
	unsigned int num_gathers;

	/* Array of handles to be pinned & unpinned */
	struct host1x_reloc *relocs;
	unsigned int num_relocs;
	struct host1x_job_unpin_data *unpins;
	unsigned int num_unpins;

	dma_addr_t *addr_phys;
	dma_addr_t *gather_addr_phys;
	dma_addr_t *reloc_addr_phys;

	/* Sync point id, number of increments and end related to the submit */
	u32 syncpt_id;
	u32 syncpt_incrs;
	u32 syncpt_end;

	/* Maximum time to wait for this job */
	unsigned int timeout;

	/* Index and number of slots used in the push buffer */
	unsigned int first_get;
	unsigned int num_slots;

	/* Copy of gathers */
	size_t gather_copy_size;
	dma_addr_t gather_copy;
	u8 *gather_copy_mapped;

	/* Check if register is marked as an address reg */
	int (*is_addr_reg)(struct device *dev, u32 class, u32 reg);

	/* Check if class belongs to the unit */
	int (*is_valid_class)(u32 class);

	/* Request a SETCLASS to this class */
	u32 class;

	/* Add a channel wait for previous ops to complete */
	bool serialize;
};

struct host1x_job *host1x_job_alloc(struct host1x_channel *ch,
				    u32 num_cmdbufs, u32 num_relocs);
void host1x_job_add_gather(struct host1x_job *job, struct host1x_bo *bo,
			   unsigned int words, unsigned int offset);
struct host1x_job *host1x_job_get(struct host1x_job *job);
void host1x_job_put(struct host1x_job *job);
int host1x_job_pin(struct host1x_job *job, struct device *dev);
void host1x_job_unpin(struct host1x_job *job);

/*
 * subdevice probe infrastructure
 */

struct host1x_device;

/**
 * struct host1x_driver - host1x logical device driver
 * @driver: core driver
 * @subdevs: table of OF device IDs matching subdevices for this driver
 * @list: list node for the driver
 * @probe: called when the host1x logical device is probed
 * @remove: called when the host1x logical device is removed
 * @shutdown: called when the host1x logical device is shut down
 */
struct host1x_driver {
	struct device_driver driver;

	const struct of_device_id *subdevs;
	struct list_head list;

	int (*probe)(struct host1x_device *device);
	int (*remove)(struct host1x_device *device);
	void (*shutdown)(struct host1x_device *device);
};

static inline struct host1x_driver *
to_host1x_driver(struct device_driver *driver)
{
	return container_of(driver, struct host1x_driver, driver);
}

int host1x_driver_register_full(struct host1x_driver *driver,
				struct module *owner);
void host1x_driver_unregister(struct host1x_driver *driver);

#define host1x_driver_register(driver) \
	host1x_driver_register_full(driver, THIS_MODULE)

struct host1x_device {
	struct host1x_driver *driver;
	struct list_head list;
	struct device dev;

	struct mutex subdevs_lock;
	struct list_head subdevs;
	struct list_head active;

	struct mutex clients_lock;
	struct list_head clients;

	bool registered;

	struct device_dma_parameters dma_parms;
};

static inline struct host1x_device *to_host1x_device(struct device *dev)
{
	return container_of(dev, struct host1x_device, dev);
}

int host1x_device_init(struct host1x_device *device);
int host1x_device_exit(struct host1x_device *device);

void __host1x_client_init(struct host1x_client *client, struct lock_class_key *key);
void host1x_client_exit(struct host1x_client *client);

#define host1x_client_init(client)			\
	({						\
		static struct lock_class_key __key;	\
		__host1x_client_init(client, &__key);	\
	})

int __host1x_client_register(struct host1x_client *client);

/*
 * Note that this wrapper calls __host1x_client_init() for compatibility
 * with existing callers. Callers that want to separately initialize and
 * register a host1x client must first initialize using either of the
 * __host1x_client_init() or host1x_client_init() functions and then use
 * the low-level __host1x_client_register() function to avoid the client
 * getting reinitialized.
 */
#define host1x_client_register(client)			\
	({						\
		static struct lock_class_key __key;	\
		__host1x_client_init(client, &__key);	\
		__host1x_client_register(client);	\
	})

int host1x_client_unregister(struct host1x_client *client);

int host1x_client_suspend(struct host1x_client *client);
int host1x_client_resume(struct host1x_client *client);

struct tegra_mipi_device;

struct tegra_mipi_device *tegra_mipi_request(struct device *device,
					     struct device_node *np);
void tegra_mipi_free(struct tegra_mipi_device *device);
int tegra_mipi_enable(struct tegra_mipi_device *device);
int tegra_mipi_disable(struct tegra_mipi_device *device);
int tegra_mipi_start_calibration(struct tegra_mipi_device *device);
int tegra_mipi_finish_calibration(struct tegra_mipi_device *device);

#endif