67eacc1583
This patch adds Device Tree support to the shdma driver. No special DT properties are used, only standard DMA DT bindings are implemented. Since shdma controllers reside on SoCs, their configuration is SoC-specific and shall be passed to the driver from the SoC platform data, using the auxdata procedure. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
129 lines
4.2 KiB
C
129 lines
4.2 KiB
C
/*
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* Dmaengine driver base library for DMA controllers, found on SH-based SoCs
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*
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* extracted from shdma.c and headers
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*
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* Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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* Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
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* Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
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* Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*/
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#ifndef SHDMA_BASE_H
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#define SHDMA_BASE_H
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#include <linux/dmaengine.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/types.h>
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/**
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* shdma_pm_state - DMA channel PM state
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* SHDMA_PM_ESTABLISHED: either idle or during data transfer
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* SHDMA_PM_BUSY: during the transfer preparation, when we have to
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* drop the lock temporarily
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* SHDMA_PM_PENDING: transfers pending
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*/
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enum shdma_pm_state {
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SHDMA_PM_ESTABLISHED,
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SHDMA_PM_BUSY,
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SHDMA_PM_PENDING,
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};
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struct device;
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/*
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* Drivers, using this library are expected to embed struct shdma_dev,
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* struct shdma_chan, struct shdma_desc, and struct shdma_slave
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* in their respective device, channel, descriptor and slave objects.
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*/
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struct shdma_slave {
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int slave_id;
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};
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struct shdma_desc {
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struct list_head node;
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struct dma_async_tx_descriptor async_tx;
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enum dma_transfer_direction direction;
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size_t partial;
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dma_cookie_t cookie;
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int chunks;
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int mark;
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};
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struct shdma_chan {
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spinlock_t chan_lock; /* Channel operation lock */
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struct list_head ld_queue; /* Link descriptors queue */
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struct list_head ld_free; /* Free link descriptors */
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struct dma_chan dma_chan; /* DMA channel */
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struct device *dev; /* Channel device */
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void *desc; /* buffer for descriptor array */
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int desc_num; /* desc count */
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size_t max_xfer_len; /* max transfer length */
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int id; /* Raw id of this channel */
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int irq; /* Channel IRQ */
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int slave_id; /* Client ID for slave DMA */
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int hw_req; /* DMA request line for slave DMA - same
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* as MID/RID, used with DT */
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enum shdma_pm_state pm_state;
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};
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/**
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* struct shdma_ops - simple DMA driver operations
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* desc_completed: return true, if this is the descriptor, that just has
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* completed (atomic)
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* halt_channel: stop DMA channel operation (atomic)
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* channel_busy: return true, if the channel is busy (atomic)
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* slave_addr: return slave DMA address
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* desc_setup: set up the hardware specific descriptor portion (atomic)
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* set_slave: bind channel to a slave
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* setup_xfer: configure channel hardware for operation (atomic)
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* start_xfer: start the DMA transfer (atomic)
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* embedded_desc: return Nth struct shdma_desc pointer from the
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* descriptor array
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* chan_irq: process channel IRQ, return true if a transfer has
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* completed (atomic)
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*/
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struct shdma_ops {
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bool (*desc_completed)(struct shdma_chan *, struct shdma_desc *);
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void (*halt_channel)(struct shdma_chan *);
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bool (*channel_busy)(struct shdma_chan *);
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dma_addr_t (*slave_addr)(struct shdma_chan *);
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int (*desc_setup)(struct shdma_chan *, struct shdma_desc *,
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dma_addr_t, dma_addr_t, size_t *);
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int (*set_slave)(struct shdma_chan *, int, bool);
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void (*setup_xfer)(struct shdma_chan *, int);
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void (*start_xfer)(struct shdma_chan *, struct shdma_desc *);
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struct shdma_desc *(*embedded_desc)(void *, int);
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bool (*chan_irq)(struct shdma_chan *, int);
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size_t (*get_partial)(struct shdma_chan *, struct shdma_desc *);
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};
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struct shdma_dev {
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struct dma_device dma_dev;
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struct shdma_chan **schan;
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const struct shdma_ops *ops;
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size_t desc_size;
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};
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#define shdma_for_each_chan(c, d, i) for (i = 0, c = (d)->schan[0]; \
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i < (d)->dma_dev.chancnt; c = (d)->schan[++i])
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int shdma_request_irq(struct shdma_chan *, int,
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unsigned long, const char *);
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void shdma_free_irq(struct shdma_chan *);
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bool shdma_reset(struct shdma_dev *sdev);
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void shdma_chan_probe(struct shdma_dev *sdev,
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struct shdma_chan *schan, int id);
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void shdma_chan_remove(struct shdma_chan *schan);
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int shdma_init(struct device *dev, struct shdma_dev *sdev,
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int chan_num);
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void shdma_cleanup(struct shdma_dev *sdev);
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bool shdma_chan_filter(struct dma_chan *chan, void *arg);
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#endif
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