xref: /openbmc/linux/drivers/dma/st_fdma.h (revision 2874c5fd)

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * DMA driver header for STMicroelectronics STi FDMA controller
 *
 * Copyright (C) 2014 STMicroelectronics
 *
 * Author: Ludovic Barre <Ludovic.barre@st.com>
 */
#ifndef __DMA_ST_FDMA_H
#define __DMA_ST_FDMA_H

#include <linux/dmaengine.h>
#include <linux/dmapool.h>
#include <linux/io.h>
#include <linux/remoteproc/st_slim_rproc.h>
#include "virt-dma.h"

#define ST_FDMA_NR_DREQS 32
#define FW_NAME_SIZE 30
#define DRIVER_NAME "st-fdma"

/**
 * struct st_fdma_generic_node - Free running/paced generic node
 *
 * @length: Length in bytes of a line in a 2D mem to mem
 * @sstride: Stride, in bytes, between source lines in a 2D data move
 * @dstride: Stride, in bytes, between destination lines in a 2D data move
 */
struct st_fdma_generic_node {
	u32 length;
	u32 sstride;
	u32 dstride;
};

/**
 * struct st_fdma_hw_node - Node structure used by fdma hw
 *
 * @next: Pointer to next node
 * @control: Transfer Control Parameters
 * @nbytes: Number of Bytes to read
 * @saddr: Source address
 * @daddr: Destination address
 *
 * @generic: generic node for free running/paced transfert type
 * 2 others transfert type are possible, but not yet implemented
 *
 * The NODE structures must be aligned to a 32 byte boundary
 */
struct st_fdma_hw_node {
	u32 next;
	u32 control;
	u32 nbytes;
	u32 saddr;
	u32 daddr;
	union {
		struct st_fdma_generic_node generic;
	};
} __aligned(32);

/*
 * node control parameters
 */
#define FDMA_NODE_CTRL_REQ_MAP_MASK	GENMASK(4, 0)
#define FDMA_NODE_CTRL_REQ_MAP_FREE_RUN	0x0
#define FDMA_NODE_CTRL_REQ_MAP_DREQ(n)	((n)&FDMA_NODE_CTRL_REQ_MAP_MASK)
#define FDMA_NODE_CTRL_REQ_MAP_EXT		FDMA_NODE_CTRL_REQ_MAP_MASK
#define FDMA_NODE_CTRL_SRC_MASK		GENMASK(6, 5)
#define FDMA_NODE_CTRL_SRC_STATIC	BIT(5)
#define FDMA_NODE_CTRL_SRC_INCR		BIT(6)
#define FDMA_NODE_CTRL_DST_MASK		GENMASK(8, 7)
#define FDMA_NODE_CTRL_DST_STATIC	BIT(7)
#define FDMA_NODE_CTRL_DST_INCR		BIT(8)
#define FDMA_NODE_CTRL_SECURE		BIT(15)
#define FDMA_NODE_CTRL_PAUSE_EON	BIT(30)
#define FDMA_NODE_CTRL_INT_EON		BIT(31)

/**
 * struct st_fdma_sw_node - descriptor structure for link list
 *
 * @pdesc: Physical address of desc
 * @node: link used for putting this into a channel queue
 */
struct st_fdma_sw_node {
	dma_addr_t pdesc;
	struct st_fdma_hw_node *desc;
};

#define NAME_SZ 10

struct st_fdma_driverdata {
	u32 id;
	char name[NAME_SZ];
};

struct st_fdma_desc {
	struct virt_dma_desc vdesc;
	struct st_fdma_chan *fchan;
	bool iscyclic;
	unsigned int n_nodes;
	struct st_fdma_sw_node node[];
};

enum st_fdma_type {
	ST_FDMA_TYPE_FREE_RUN,
	ST_FDMA_TYPE_PACED,
};

struct st_fdma_cfg {
	struct device_node *of_node;
	enum st_fdma_type type;
	dma_addr_t dev_addr;
	enum dma_transfer_direction dir;
	int req_line; /* request line */
	long req_ctrl; /* Request control */
};

struct st_fdma_chan {
	struct st_fdma_dev *fdev;
	struct dma_pool *node_pool;
	struct dma_slave_config scfg;
	struct st_fdma_cfg cfg;

	int dreq_line;

	struct virt_dma_chan vchan;
	struct st_fdma_desc *fdesc;
	enum dma_status	status;
};

struct st_fdma_dev {
	struct device *dev;
	const struct st_fdma_driverdata *drvdata;
	struct dma_device dma_device;

	struct st_slim_rproc *slim_rproc;

	int irq;

	struct st_fdma_chan *chans;

	spinlock_t dreq_lock;
	unsigned long dreq_mask;

	u32 nr_channels;
	char fw_name[FW_NAME_SIZE];
};

/* Peripheral Registers*/

#define FDMA_CMD_STA_OFST	0xFC0
#define FDMA_CMD_SET_OFST	0xFC4
#define FDMA_CMD_CLR_OFST	0xFC8
#define FDMA_CMD_MASK_OFST	0xFCC
#define FDMA_CMD_START(ch)		(0x1 << (ch << 1))
#define FDMA_CMD_PAUSE(ch)		(0x2 << (ch << 1))
#define FDMA_CMD_FLUSH(ch)		(0x3 << (ch << 1))

#define FDMA_INT_STA_OFST	0xFD0
#define FDMA_INT_STA_CH			0x1
#define FDMA_INT_STA_ERR		0x2

#define FDMA_INT_SET_OFST	0xFD4
#define FDMA_INT_CLR_OFST	0xFD8
#define FDMA_INT_MASK_OFST	0xFDC

#define fdma_read(fdev, name) \
	readl((fdev)->slim_rproc->peri + name)

#define fdma_write(fdev, val, name) \
	writel((val), (fdev)->slim_rproc->peri + name)

/* fchan interface (dmem) */
#define FDMA_CH_CMD_OFST	0x200
#define FDMA_CH_CMD_STA_MASK		GENMASK(1, 0)
#define FDMA_CH_CMD_STA_IDLE		(0x0)
#define FDMA_CH_CMD_STA_START		(0x1)
#define FDMA_CH_CMD_STA_RUNNING		(0x2)
#define FDMA_CH_CMD_STA_PAUSED		(0x3)
#define FDMA_CH_CMD_ERR_MASK		GENMASK(4, 2)
#define FDMA_CH_CMD_ERR_INT		(0x0 << 2)
#define FDMA_CH_CMD_ERR_NAND		(0x1 << 2)
#define FDMA_CH_CMD_ERR_MCHI		(0x2 << 2)
#define FDMA_CH_CMD_DATA_MASK		GENMASK(31, 5)
#define fchan_read(fchan, name) \
	readl((fchan)->fdev->slim_rproc->mem[ST_SLIM_DMEM].cpu_addr \
			+ (fchan)->vchan.chan.chan_id * 0x4 \
			+ name)

#define fchan_write(fchan, val, name) \
	writel((val), (fchan)->fdev->slim_rproc->mem[ST_SLIM_DMEM].cpu_addr \
			+ (fchan)->vchan.chan.chan_id * 0x4 \
			+ name)

/* req interface */
#define FDMA_REQ_CTRL_OFST	0x240
#define dreq_write(fchan, val, name) \
	writel((val), (fchan)->fdev->slim_rproc->mem[ST_SLIM_DMEM].cpu_addr \
			+ fchan->dreq_line * 0x04 \
			+ name)
/* node interface */
#define FDMA_NODE_SZ 128
#define FDMA_PTRN_OFST		0x800
#define FDMA_CNTN_OFST		0x808
#define FDMA_SADDRN_OFST	0x80c
#define FDMA_DADDRN_OFST	0x810
#define fnode_read(fchan, name) \
	readl((fchan)->fdev->slim_rproc->mem[ST_SLIM_DMEM].cpu_addr \
			+ (fchan)->vchan.chan.chan_id * FDMA_NODE_SZ \
			+ name)

#define fnode_write(fchan, val, name) \
	writel((val), (fchan)->fdev->slim_rproc->mem[ST_SLIM_DMEM].cpu_addr \
			+ (fchan)->vchan.chan.chan_id * FDMA_NODE_SZ \
			+ name)

/*
 * request control bits
 */
#define FDMA_REQ_CTRL_NUM_OPS_MASK	GENMASK(31, 24)
#define FDMA_REQ_CTRL_NUM_OPS(n)	(FDMA_REQ_CTRL_NUM_OPS_MASK & \
					((n) << 24))
#define FDMA_REQ_CTRL_INITIATOR_MASK	BIT(22)
#define FDMA_REQ_CTRL_INIT0		(0x0 << 22)
#define FDMA_REQ_CTRL_INIT1		(0x1 << 22)
#define FDMA_REQ_CTRL_INC_ADDR_ON	BIT(21)
#define FDMA_REQ_CTRL_DATA_SWAP_ON	BIT(17)
#define FDMA_REQ_CTRL_WNR		BIT(14)
#define FDMA_REQ_CTRL_OPCODE_MASK	GENMASK(7, 4)
#define FDMA_REQ_CTRL_OPCODE_LD_ST1	(0x0 << 4)
#define FDMA_REQ_CTRL_OPCODE_LD_ST2	(0x1 << 4)
#define FDMA_REQ_CTRL_OPCODE_LD_ST4	(0x2 << 4)
#define FDMA_REQ_CTRL_OPCODE_LD_ST8	(0x3 << 4)
#define FDMA_REQ_CTRL_OPCODE_LD_ST16	(0x4 << 4)
#define FDMA_REQ_CTRL_OPCODE_LD_ST32	(0x5 << 4)
#define FDMA_REQ_CTRL_OPCODE_LD_ST64	(0x6 << 4)
#define FDMA_REQ_CTRL_HOLDOFF_MASK	GENMASK(2, 0)
#define FDMA_REQ_CTRL_HOLDOFF(n)	((n) & FDMA_REQ_CTRL_HOLDOFF_MASK)

/* bits used by client to configure request control */
#define FDMA_REQ_CTRL_CFG_MASK (FDMA_REQ_CTRL_HOLDOFF_MASK | \
				FDMA_REQ_CTRL_DATA_SWAP_ON | \
				FDMA_REQ_CTRL_INC_ADDR_ON | \
				FDMA_REQ_CTRL_INITIATOR_MASK)

#endif	/* __DMA_ST_FDMA_H */