250 lines
6.7 KiB
C
250 lines
6.7 KiB
C
/*
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* DMA driver header for STMicroelectronics STi FDMA controller
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*
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* Copyright (C) 2014 STMicroelectronics
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*
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* Author: Ludovic Barre <Ludovic.barre@st.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef __DMA_ST_FDMA_H
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#define __DMA_ST_FDMA_H
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#include <linux/dmaengine.h>
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#include <linux/dmapool.h>
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#include <linux/io.h>
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#include <linux/remoteproc/st_slim_rproc.h>
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#include "virt-dma.h"
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#define ST_FDMA_NR_DREQS 32
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#define FW_NAME_SIZE 30
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#define DRIVER_NAME "st-fdma"
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/**
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* struct st_fdma_generic_node - Free running/paced generic node
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*
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* @length: Length in bytes of a line in a 2D mem to mem
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* @sstride: Stride, in bytes, between source lines in a 2D data move
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* @dstride: Stride, in bytes, between destination lines in a 2D data move
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*/
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struct st_fdma_generic_node {
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u32 length;
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u32 sstride;
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u32 dstride;
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};
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/**
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* struct st_fdma_hw_node - Node structure used by fdma hw
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*
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* @next: Pointer to next node
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* @control: Transfer Control Parameters
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* @nbytes: Number of Bytes to read
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* @saddr: Source address
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* @daddr: Destination address
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*
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* @generic: generic node for free running/paced transfert type
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* 2 others transfert type are possible, but not yet implemented
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*
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* The NODE structures must be aligned to a 32 byte boundary
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*/
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struct st_fdma_hw_node {
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u32 next;
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u32 control;
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u32 nbytes;
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u32 saddr;
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u32 daddr;
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union {
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struct st_fdma_generic_node generic;
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};
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} __aligned(32);
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/*
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* node control parameters
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*/
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#define FDMA_NODE_CTRL_REQ_MAP_MASK GENMASK(4, 0)
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#define FDMA_NODE_CTRL_REQ_MAP_FREE_RUN 0x0
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#define FDMA_NODE_CTRL_REQ_MAP_DREQ(n) ((n)&FDMA_NODE_CTRL_REQ_MAP_MASK)
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#define FDMA_NODE_CTRL_REQ_MAP_EXT FDMA_NODE_CTRL_REQ_MAP_MASK
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#define FDMA_NODE_CTRL_SRC_MASK GENMASK(6, 5)
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#define FDMA_NODE_CTRL_SRC_STATIC BIT(5)
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#define FDMA_NODE_CTRL_SRC_INCR BIT(6)
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#define FDMA_NODE_CTRL_DST_MASK GENMASK(8, 7)
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#define FDMA_NODE_CTRL_DST_STATIC BIT(7)
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#define FDMA_NODE_CTRL_DST_INCR BIT(8)
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#define FDMA_NODE_CTRL_SECURE BIT(15)
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#define FDMA_NODE_CTRL_PAUSE_EON BIT(30)
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#define FDMA_NODE_CTRL_INT_EON BIT(31)
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/**
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* struct st_fdma_sw_node - descriptor structure for link list
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*
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* @pdesc: Physical address of desc
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* @node: link used for putting this into a channel queue
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*/
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struct st_fdma_sw_node {
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dma_addr_t pdesc;
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struct st_fdma_hw_node *desc;
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};
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#define NAME_SZ 10
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struct st_fdma_driverdata {
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u32 id;
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char name[NAME_SZ];
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};
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struct st_fdma_desc {
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struct virt_dma_desc vdesc;
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struct st_fdma_chan *fchan;
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bool iscyclic;
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unsigned int n_nodes;
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struct st_fdma_sw_node node[];
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};
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enum st_fdma_type {
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ST_FDMA_TYPE_FREE_RUN,
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ST_FDMA_TYPE_PACED,
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};
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struct st_fdma_cfg {
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struct device_node *of_node;
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enum st_fdma_type type;
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dma_addr_t dev_addr;
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enum dma_transfer_direction dir;
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int req_line; /* request line */
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long req_ctrl; /* Request control */
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};
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struct st_fdma_chan {
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struct st_fdma_dev *fdev;
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struct dma_pool *node_pool;
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struct dma_slave_config scfg;
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struct st_fdma_cfg cfg;
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int dreq_line;
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struct virt_dma_chan vchan;
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struct st_fdma_desc *fdesc;
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enum dma_status status;
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};
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struct st_fdma_dev {
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struct device *dev;
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const struct st_fdma_driverdata *drvdata;
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struct dma_device dma_device;
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struct st_slim_rproc *slim_rproc;
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int irq;
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struct st_fdma_chan *chans;
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spinlock_t dreq_lock;
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unsigned long dreq_mask;
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u32 nr_channels;
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char fw_name[FW_NAME_SIZE];
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};
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/* Peripheral Registers*/
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#define FDMA_CMD_STA_OFST 0xFC0
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#define FDMA_CMD_SET_OFST 0xFC4
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#define FDMA_CMD_CLR_OFST 0xFC8
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#define FDMA_CMD_MASK_OFST 0xFCC
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#define FDMA_CMD_START(ch) (0x1 << (ch << 1))
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#define FDMA_CMD_PAUSE(ch) (0x2 << (ch << 1))
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#define FDMA_CMD_FLUSH(ch) (0x3 << (ch << 1))
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#define FDMA_INT_STA_OFST 0xFD0
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#define FDMA_INT_STA_CH 0x1
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#define FDMA_INT_STA_ERR 0x2
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#define FDMA_INT_SET_OFST 0xFD4
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#define FDMA_INT_CLR_OFST 0xFD8
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#define FDMA_INT_MASK_OFST 0xFDC
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#define fdma_read(fdev, name) \
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readl((fdev)->slim_rproc->peri + name)
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#define fdma_write(fdev, val, name) \
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writel((val), (fdev)->slim_rproc->peri + name)
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/* fchan interface (dmem) */
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#define FDMA_CH_CMD_OFST 0x200
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#define FDMA_CH_CMD_STA_MASK GENMASK(1, 0)
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#define FDMA_CH_CMD_STA_IDLE (0x0)
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#define FDMA_CH_CMD_STA_START (0x1)
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#define FDMA_CH_CMD_STA_RUNNING (0x2)
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#define FDMA_CH_CMD_STA_PAUSED (0x3)
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#define FDMA_CH_CMD_ERR_MASK GENMASK(4, 2)
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#define FDMA_CH_CMD_ERR_INT (0x0 << 2)
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#define FDMA_CH_CMD_ERR_NAND (0x1 << 2)
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#define FDMA_CH_CMD_ERR_MCHI (0x2 << 2)
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#define FDMA_CH_CMD_DATA_MASK GENMASK(31, 5)
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#define fchan_read(fchan, name) \
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readl((fchan)->fdev->slim_rproc->mem[ST_SLIM_DMEM].cpu_addr \
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+ (fchan)->vchan.chan.chan_id * 0x4 \
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+ name)
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#define fchan_write(fchan, val, name) \
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writel((val), (fchan)->fdev->slim_rproc->mem[ST_SLIM_DMEM].cpu_addr \
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+ (fchan)->vchan.chan.chan_id * 0x4 \
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+ name)
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/* req interface */
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#define FDMA_REQ_CTRL_OFST 0x240
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#define dreq_write(fchan, val, name) \
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writel((val), (fchan)->fdev->slim_rproc->mem[ST_SLIM_DMEM].cpu_addr \
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+ fchan->dreq_line * 0x04 \
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+ name)
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/* node interface */
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#define FDMA_NODE_SZ 128
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#define FDMA_PTRN_OFST 0x800
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#define FDMA_CNTN_OFST 0x808
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#define FDMA_SADDRN_OFST 0x80c
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#define FDMA_DADDRN_OFST 0x810
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#define fnode_read(fchan, name) \
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readl((fchan)->fdev->slim_rproc->mem[ST_SLIM_DMEM].cpu_addr \
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+ (fchan)->vchan.chan.chan_id * FDMA_NODE_SZ \
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+ name)
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#define fnode_write(fchan, val, name) \
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writel((val), (fchan)->fdev->slim_rproc->mem[ST_SLIM_DMEM].cpu_addr \
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+ (fchan)->vchan.chan.chan_id * FDMA_NODE_SZ \
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+ name)
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/*
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* request control bits
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*/
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#define FDMA_REQ_CTRL_NUM_OPS_MASK GENMASK(31, 24)
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#define FDMA_REQ_CTRL_NUM_OPS(n) (FDMA_REQ_CTRL_NUM_OPS_MASK & \
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((n) << 24))
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#define FDMA_REQ_CTRL_INITIATOR_MASK BIT(22)
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#define FDMA_REQ_CTRL_INIT0 (0x0 << 22)
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#define FDMA_REQ_CTRL_INIT1 (0x1 << 22)
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#define FDMA_REQ_CTRL_INC_ADDR_ON BIT(21)
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#define FDMA_REQ_CTRL_DATA_SWAP_ON BIT(17)
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#define FDMA_REQ_CTRL_WNR BIT(14)
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#define FDMA_REQ_CTRL_OPCODE_MASK GENMASK(7, 4)
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#define FDMA_REQ_CTRL_OPCODE_LD_ST1 (0x0 << 4)
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#define FDMA_REQ_CTRL_OPCODE_LD_ST2 (0x1 << 4)
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#define FDMA_REQ_CTRL_OPCODE_LD_ST4 (0x2 << 4)
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#define FDMA_REQ_CTRL_OPCODE_LD_ST8 (0x3 << 4)
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#define FDMA_REQ_CTRL_OPCODE_LD_ST16 (0x4 << 4)
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#define FDMA_REQ_CTRL_OPCODE_LD_ST32 (0x5 << 4)
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#define FDMA_REQ_CTRL_OPCODE_LD_ST64 (0x6 << 4)
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#define FDMA_REQ_CTRL_HOLDOFF_MASK GENMASK(2, 0)
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#define FDMA_REQ_CTRL_HOLDOFF(n) ((n) & FDMA_REQ_CTRL_HOLDOFF_MASK)
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/* bits used by client to configure request control */
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#define FDMA_REQ_CTRL_CFG_MASK (FDMA_REQ_CTRL_HOLDOFF_MASK | \
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FDMA_REQ_CTRL_DATA_SWAP_ON | \
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FDMA_REQ_CTRL_INC_ADDR_ON | \
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FDMA_REQ_CTRL_INITIATOR_MASK)
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#endif /* __DMA_ST_FDMA_H */
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