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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_ */