path: root/drivers/firmware/stratix10-svc.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2017-2018, Intel Corporation
 */

#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/genalloc.h>
#include <linux/io.h>
#include <linux/kfifo.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/firmware/intel/stratix10-smc.h>
#include <linux/firmware/intel/stratix10-svc-client.h>
#include <linux/types.h>

/**
 * SVC_NUM_DATA_IN_FIFO - number of struct stratix10_svc_data in the FIFO
 *
 * SVC_NUM_CHANNEL - number of channel supported by service layer driver
 *
 * FPGA_CONFIG_DATA_CLAIM_TIMEOUT_MS - claim back the submitted buffer(s)
 * from the secure world for FPGA manager to reuse, or to free the buffer(s)
 * when all bit-stream data had be send.
 *
 * FPGA_CONFIG_STATUS_TIMEOUT_SEC - poll the FPGA configuration status,
 * service layer will return error to FPGA manager when timeout occurs,
 * timeout is set to 30 seconds (30 * 1000) at Intel Stratix10 SoC.
 */
#define SVC_NUM_DATA_IN_FIFO			32
#define SVC_NUM_CHANNEL				3
#define FPGA_CONFIG_DATA_CLAIM_TIMEOUT_MS	200
#define FPGA_CONFIG_STATUS_TIMEOUT_SEC		30
#define BYTE_TO_WORD_SIZE              4

/* stratix10 service layer clients */
#define STRATIX10_RSU				"stratix10-rsu"
#define INTEL_FCS				"intel-fcs"

typedef void (svc_invoke_fn)(unsigned long, unsigned long, unsigned long,
			     unsigned long, unsigned long, unsigned long,
			     unsigned long, unsigned long,
			     struct arm_smccc_res *);
struct stratix10_svc_chan;

/**
 * struct stratix10_svc - svc private data
 * @stratix10_svc_rsu: pointer to stratix10 RSU device
 */
struct stratix10_svc {
	struct platform_device *stratix10_svc_rsu;
	struct platform_device *intel_svc_fcs;
};

/**
 * struct stratix10_svc_sh_memory - service shared memory structure
 * @sync_complete: state for a completion
 * @addr: physical address of shared memory block
 * @size: size of shared memory block
 * @invoke_fn: function to issue secure monitor or hypervisor call
 *
 * This struct is used to save physical address and size of shared memory
 * block. The shared memory blocked is allocated by secure monitor software
 * at secure world.
 *
 * Service layer driver uses the physical address and size to create a memory
 * pool, then allocates data buffer from that memory pool for service client.
 */
struct stratix10_svc_sh_memory {
	struct completion sync_complete;
	unsigned long addr;
	unsigned long size;
	svc_invoke_fn *invoke_fn;
};

/**
 * struct stratix10_svc_data_mem - service memory structure
 * @vaddr: virtual address
 * @paddr: physical address
 * @size: size of memory
 * @node: link list head node
 *
 * This struct is used in a list that keeps track of buffers which have
 * been allocated or freed from the memory pool. Service layer driver also
 * uses this struct to transfer physical address to virtual address.
 */
struct stratix10_svc_data_mem {
	void *vaddr;
	phys_addr_t paddr;
	size_t size;
	struct list_head node;
};

/**
 * struct stratix10_svc_data - service data structure
 * @chan: service channel
 * @paddr: physical address of to be processed payload
 * @size: to be processed playload size
 * @paddr_output: physical address of processed payload
 * @size_output: processed payload size
 * @command: service command requested by client
 * @flag: configuration type (full or partial)
 * @arg: args to be passed via registers and not physically mapped buffers
 *
 * This struct is used in service FIFO for inter-process communication.
 */
struct stratix10_svc_data {
	struct stratix10_svc_chan *chan;
	phys_addr_t paddr;
	size_t size;
	phys_addr_t paddr_output;
	size_t size_output;
	u32 command;
	u32 flag;
	u64 arg[3];
};

/**
 * struct stratix10_svc_controller - service controller
 * @dev: device
 * @chans: array of service channels
 * @num_chans: number of channels in 'chans' array
 * @num_active_client: number of active service client
 * @node: list management
 * @genpool: memory pool pointing to the memory region
 * @task: pointer to the thread task which handles SMC or HVC call
 * @svc_fifo: a queue for storing service message data
 * @complete_status: state for completion
 * @svc_fifo_lock: protect access to service message data queue
 * @invoke_fn: function to issue secure monitor call or hypervisor call
 *
 * This struct is used to create communication channels for service clients, to
 * handle secure monitor or hypervisor call.
 */
struct stratix10_svc_controller {
	struct device *dev;
	struct stratix10_svc_chan *chans