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Filename : k3-ringacc.h
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/* SPDX-License-Identifier: GPL-2.0 */
/*
 * K3 Ring Accelerator (RA) subsystem interface
 *
 * Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com
 */

#ifndef __SOC_TI_K3_RINGACC_API_H_
#define __SOC_TI_K3_RINGACC_API_H_

#include <linux/types.h>

struct device_node;

/**
 * enum k3_ring_mode - &struct k3_ring_cfg mode
 *
 * RA ring operational modes
 *
 * @K3_RINGACC_RING_MODE_RING: Exposed Ring mode for SW direct access
 * @K3_RINGACC_RING_MODE_MESSAGE: Messaging mode. Messaging mode requires
 *	that all accesses to the queue must go through this IP so that all
 *	accesses to the memory are controlled and ordered. This IP then
 *	controls the entire state of the queue, and SW has no directly control,
 *	such as through doorbells and cannot access the storage memory directly.
 *	This is particularly useful when more than one SW or HW entity can be
 *	the producer and/or consumer at the same time
 * @K3_RINGACC_RING_MODE_CREDENTIALS: Credentials mode is message mode plus
 *	stores credentials with each message, requiring the element size to be
 *	doubled to fit the credentials. Any exposed memory should be protected
 *	by a firewall from unwanted access
 */
enum k3_ring_mode {
	K3_RINGACC_RING_MODE_RING = 0,
	K3_RINGACC_RING_MODE_MESSAGE,
	K3_RINGACC_RING_MODE_CREDENTIALS,
	K3_RINGACC_RING_MODE_INVALID
};

/**
 * enum k3_ring_size - &struct k3_ring_cfg elm_size
 *
 * RA ring element's sizes in bytes.
 */
enum k3_ring_size {
	K3_RINGACC_RING_ELSIZE_4 = 0,
	K3_RINGACC_RING_ELSIZE_8,
	K3_RINGACC_RING_ELSIZE_16,
	K3_RINGACC_RING_ELSIZE_32,
	K3_RINGACC_RING_ELSIZE_64,
	K3_RINGACC_RING_ELSIZE_128,
	K3_RINGACC_RING_ELSIZE_256,
	K3_RINGACC_RING_ELSIZE_INVALID
};

struct k3_ringacc;
struct k3_ring;

/**
 * enum k3_ring_cfg - RA ring configuration structure
 *
 * @size: Ring size, number of elements
 * @elm_size: Ring element size
 * @mode: Ring operational mode
 * @flags: Ring configuration flags. Possible values:
 *	 @K3_RINGACC_RING_SHARED: when set allows to request the same ring
 *	 few times. It's usable when the same ring is used as Free Host PD ring
 *	 for different flows, for example.
 *	 Note: Locking should be done by consumer if required
 * @dma_dev: Master device which is using and accessing to the ring
 *	memory when the mode is K3_RINGACC_RING_MODE_RING. Memory allocations
 *	should be done using this device.
 * @asel: Address Space Select value for physical addresses
 */
struct k3_ring_cfg {
	u32 size;
	enum k3_ring_size elm_size;
	enum k3_ring_mode mode;
#define K3_RINGACC_RING_SHARED BIT(1)
	u32 flags;

	struct device *dma_dev;
	u32 asel;
};

#define K3_RINGACC_RING_ID_ANY (-1)

/**
 * of_k3_ringacc_get_by_phandle - find a RA by phandle property
 * @np: device node
 * @propname: property name containing phandle on RA node
 *
 * Returns pointer on the RA - struct k3_ringacc
 * or -ENODEV if not found,
 * or -EPROBE_DEFER if not yet registered
 */
struct k3_ringacc *of_k3_ringacc_get_by_phandle(struct device_node *np,
						const char *property);

#define K3_RINGACC_RING_USE_PROXY BIT(1)

/**
 * k3_ringacc_request_ring - request ring from ringacc
 * @ringacc: pointer on ringacc
 * @id: ring id or K3_RINGACC_RING_ID_ANY for any general purpose ring
 * @flags:
 *	@K3_RINGACC_RING_USE_PROXY: if set - proxy will be allocated and
 *		used to access ring memory. Sopported only for rings in
 *		Message/Credentials/Queue mode.
 *
 * Returns pointer on the Ring - struct k3_ring
 * or NULL in case of failure.
 */
struct k3_ring *k3_ringacc_request_ring(struct k3_ringacc *ringacc,
					int id, u32 flags);

int k3_ringacc_request_rings_pair(struct k3_ringacc *ringacc,
				  int fwd_id, int compl_id,
				  struct k3_ring **fwd_ring,
				  struct k3_ring **compl_ring);
/**
 * k3_ringacc_ring_reset - ring reset
 * @ring: pointer on Ring
 *
 * Resets ring internal state ((hw)occ, (hw)idx).
 */
void k3_ringacc_ring_reset(struct k3_ring *ring);
/**
 * k3_ringacc_ring_reset - ring reset for DMA rings
 * @ring: pointer on Ring
 *
 * Resets ring internal state ((hw)occ, (hw)idx). Should be used for rings
 * which are read by K3 UDMA, like TX or Free Host PD rings.
 */
void k3_ringacc_ring_reset_dma(struct k3_ring *ring, u32 occ);

/**
 * k3_ringacc_ring_free - ring free
 * @ring: pointer on Ring
 *
 * Resets ring and free all alocated resources.
 */
int k3_ringacc_ring_free(struct k3_ring *ring);

/**
 * k3_ringacc_get_ring_id - Get the Ring ID
 * @ring: pointer on ring
 *
 * Returns the Ring ID
 */
u32 k3_ringacc_get_ring_id(struct k3_ring *ring);

/**
 * k3_ringacc_get_ring_irq_num - Get the irq number for the ring
 * @ring: pointer on ring
 *
 * Returns the interrupt number which can be used to request the interrupt
 */
int k3_ringacc_get_ring_irq_num(struct k3_ring *ring);

/**
 * k3_ringacc_ring_cfg - ring configure
 * @ring: pointer on ring
 * @cfg: Ring configuration parameters (see &struct k3_ring_cfg)
 *
 * Configures ring, including ring memory allocation.
 * Returns 0 on success, errno otherwise.
 */
int k3_ringacc_ring_cfg(struct k3_ring *ring, struct k3_ring_cfg *cfg);

/**
 * k3_ringacc_ring_get_size - get ring size
 * @ring: pointer on ring
 *
 * Returns ring size in number of elements.
 */
u32 k3_ringacc_ring_get_size(struct k3_ring *ring);

/**
 * k3_ringacc_ring_get_free - get free elements
 * @ring: pointer on ring
 *
 * Returns number of free elements in the ring.
 */
u32 k3_ringacc_ring_get_free(struct k3_ring *ring);

/**
 * k3_ringacc_ring_get_occ - get ring occupancy
 * @ring: pointer on ring
 *
 * Returns total number of valid entries on the ring
 */
u32 k3_ringacc_ring_get_occ(struct k3_ring *ring);

/**
 * k3_ringacc_ring_is_full - checks if ring is full
 * @ring: pointer on ring
 *
 * Returns true if the ring is full
 */
u32 k3_ringacc_ring_is_full(struct k3_ring *ring);

/**
 * k3_ringacc_ring_push - push element to the ring tail
 * @ring: pointer on ring
 * @elem: pointer on ring element buffer
 *
 * Push one ring element to the ring tail. Size of the ring element is
 * determined by ring configuration &struct k3_ring_cfg elm_size.
 *
 * Returns 0 on success, errno otherwise.
 */
int k3_ringacc_ring_push(struct k3_ring *ring, void *elem);

/**
 * k3_ringacc_ring_pop - pop element from the ring head
 * @ring: pointer on ring
 * @elem: pointer on ring element buffer
 *
 * Push one ring element from the ring head. Size of the ring element is
 * determined by ring configuration &struct k3_ring_cfg elm_size..
 *
 * Returns 0 on success, errno otherwise.
 */
int k3_ringacc_ring_pop(struct k3_ring *ring, void *elem);

/**
 * k3_ringacc_ring_push_head - push element to the ring head
 * @ring: pointer on ring
 * @elem: pointer on ring element buffer
 *
 * Push one ring element to the ring head. Size of the ring element is
 * determined by ring configuration &struct k3_ring_cfg elm_size.
 *
 * Returns 0 on success, errno otherwise.
 * Not Supported by ring modes: K3_RINGACC_RING_MODE_RING
 */
int k3_ringacc_ring_push_head(struct k3_ring *ring, void *elem);

/**
 * k3_ringacc_ring_pop_tail - pop element from the ring tail
 * @ring: pointer on ring
 * @elem: pointer on ring element buffer
 *
 * Push one ring element from the ring tail. Size of the ring element is
 * determined by ring configuration &struct k3_ring_cfg elm_size.
 *
 * Returns 0 on success, errno otherwise.
 * Not Supported by ring modes: K3_RINGACC_RING_MODE_RING
 */
int k3_ringacc_ring_pop_tail(struct k3_ring *ring, void *elem);

u32 k3_ringacc_get_tisci_dev_id(struct k3_ring *ring);

/* DMA ring support */
struct ti_sci_handle;

/**
 * struct struct k3_ringacc_init_data - Initialization data for DMA rings
 */
struct k3_ringacc_init_data {
	const struct ti_sci_handle *tisci;
	u32 tisci_dev_id;
	u32 num_rings;
};

struct k3_ringacc *k3_ringacc_dmarings_init(struct platform_device *pdev,
					    struct k3_ringacc_init_data *data);

#endif /* __SOC_TI_K3_RINGACC_API_H_ */