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shdma-base.h
/* SPDX-License-Identifier: GPL-2.0 * * Dmaengine driver base library for DMA controllers, found on SH-based SoCs * * extracted from shdma.c and headers * * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de> * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. */ #ifndef SHDMA_BASE_H #define SHDMA_BASE_H #include <linux/dmaengine.h> #include <linux/interrupt.h> #include <linux/list.h> #include <linux/types.h> /** * shdma_pm_state - DMA channel PM state * SHDMA_PM_ESTABLISHED: either idle or during data transfer * SHDMA_PM_BUSY: during the transfer preparation, when we have to * drop the lock temporarily * SHDMA_PM_PENDING: transfers pending */ enum shdma_pm_state { SHDMA_PM_ESTABLISHED, SHDMA_PM_BUSY, SHDMA_PM_PENDING, }; struct device; /* * Drivers, using this library are expected to embed struct shdma_dev, * struct shdma_chan, struct shdma_desc, and struct shdma_slave * in their respective device, channel, descriptor and slave objects. */ struct shdma_slave { int slave_id; }; struct shdma_desc { struct list_head node; struct dma_async_tx_descriptor async_tx; enum dma_transfer_direction direction; size_t partial; dma_cookie_t cookie; int chunks; int mark; bool cyclic; /* used as cyclic transfer */ }; struct shdma_chan { spinlock_t chan_lock; /* Channel operation lock */ struct list_head ld_queue; /* Link descriptors queue */ struct list_head ld_free; /* Free link descriptors */ struct dma_chan dma_chan; /* DMA channel */ struct device *dev; /* Channel device */ void *desc; /* buffer for descriptor array */ int desc_num; /* desc count */ size_t max_xfer_len; /* max transfer length */ int id; /* Raw id of this channel */ int irq; /* Channel IRQ */ int slave_id; /* Client ID for slave DMA */ int real_slave_id; /* argument passed to filter function */ int hw_req; /* DMA request line for slave DMA - same * as MID/RID, used with DT */ enum shdma_pm_state pm_state; }; /** * struct shdma_ops - simple DMA driver operations * desc_completed: return true, if this is the descriptor, that just has * completed (atomic) * halt_channel: stop DMA channel operation (atomic) * channel_busy: return true, if the channel is busy (atomic) * slave_addr: return slave DMA address * desc_setup: set up the hardware specific descriptor portion (atomic) * set_slave: bind channel to a slave * setup_xfer: configure channel hardware for operation (atomic) * start_xfer: start the DMA transfer (atomic) * embedded_desc: return Nth struct shdma_desc pointer from the * descriptor array * chan_irq: process channel IRQ, return true if a transfer has * completed (atomic) */ struct shdma_ops { bool (*desc_completed)(struct shdma_chan *, struct shdma_desc *); void (*halt_channel)(struct shdma_chan *); bool (*channel_busy)(struct shdma_chan *); dma_addr_t (*slave_addr)(struct shdma_chan *); int (*desc_setup)(struct shdma_chan *, struct shdma_desc *, dma_addr_t, dma_addr_t, size_t *); int (*set_slave)(struct shdma_chan *, int, dma_addr_t, bool); void (*setup_xfer)(struct shdma_chan *, int); void (*start_xfer)(struct shdma_chan *, struct shdma_desc *); struct shdma_desc *(*embedded_desc)(void *, int); bool (*chan_irq)(struct shdma_chan *, int); size_t (*get_partial)(struct shdma_chan *, struct shdma_desc *); }; struct shdma_dev { struct dma_device dma_dev; struct shdma_chan **schan; const struct shdma_ops *ops; size_t desc_size; }; #define shdma_for_each_chan(c, d, i) for (i = 0, c = (d)->schan[0]; \ i < (d)->dma_dev.chancnt; c = (d)->schan[++i]) int shdma_request_irq(struct shdma_chan *, int, unsigned long, const char *); bool shdma_reset(struct shdma_dev *sdev); void shdma_chan_probe(struct shdma_dev *sdev, struct shdma_chan *schan, int id); void shdma_chan_remove(struct shdma_chan *schan); int shdma_init(struct device *dev, struct shdma_dev *sdev, int chan_num); void shdma_cleanup(struct shdma_dev *sdev); #if IS_ENABLED(CONFIG_SH_DMAE_BASE) bool shdma_chan_filter(struct dma_chan *chan, void *arg); #else static inline bool shdma_chan_filter(struct dma_chan *chan, void *arg) { return false; } #endif #endif
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