// SPDX-License-Identifier: GPL-2.0-only /* * Copyright 2012 Marvell International Ltd. */ #include <linux/err.h> #include <linux/module.h> #include <linux/init.h> #include <linux/types.h> #include <linux/interrupt.h> #include <linux/dma-mapping.h> #include <linux/slab.h> #include <linux/dmaengine.h> #include <linux/platform_device.h> #include <linux/device.h> #include <linux/platform_data/mmp_dma.h> #include <linux/dmapool.h> #include <linux/of_dma.h> #include <linux/of.h> #include "dmaengine.h" #define DCSR … #define DALGN … #define DINT … #define DDADR … #define DSADR(n) … #define DTADR(n) … #define DCMD … #define DCSR_RUN … #define DCSR_NODESC … #define DCSR_STOPIRQEN … #define DCSR_REQPEND … #define DCSR_STOPSTATE … #define DCSR_ENDINTR … #define DCSR_STARTINTR … #define DCSR_BUSERR … #define DCSR_EORIRQEN … #define DCSR_EORJMPEN … #define DCSR_EORSTOPEN … #define DCSR_SETCMPST … #define DCSR_CLRCMPST … #define DCSR_CMPST … #define DCSR_EORINTR … #define DRCMR(n) … #define DRCMR_MAPVLD … #define DRCMR_CHLNUM … #define DDADR_DESCADDR … #define DDADR_STOP … #define DCMD_INCSRCADDR … #define DCMD_INCTRGADDR … #define DCMD_FLOWSRC … #define DCMD_FLOWTRG … #define DCMD_STARTIRQEN … #define DCMD_ENDIRQEN … #define DCMD_ENDIAN … #define DCMD_BURST8 … #define DCMD_BURST16 … #define DCMD_BURST32 … #define DCMD_WIDTH1 … #define DCMD_WIDTH2 … #define DCMD_WIDTH4 … #define DCMD_LENGTH … #define PDMA_MAX_DESC_BYTES … struct mmp_pdma_desc_hw { … } __aligned(…); struct mmp_pdma_desc_sw { … }; struct mmp_pdma_phy; struct mmp_pdma_chan { … }; struct mmp_pdma_phy { … }; struct mmp_pdma_device { … }; #define tx_to_mmp_pdma_desc(tx) … #define to_mmp_pdma_desc(lh) … #define to_mmp_pdma_chan(dchan) … #define to_mmp_pdma_dev(dmadev) … static int mmp_pdma_config_write(struct dma_chan *dchan, struct dma_slave_config *cfg, enum dma_transfer_direction direction); static void set_desc(struct mmp_pdma_phy *phy, dma_addr_t addr) { … } static void enable_chan(struct mmp_pdma_phy *phy) { … } static void disable_chan(struct mmp_pdma_phy *phy) { … } static int clear_chan_irq(struct mmp_pdma_phy *phy) { … } static irqreturn_t mmp_pdma_chan_handler(int irq, void *dev_id) { … } static irqreturn_t mmp_pdma_int_handler(int irq, void *dev_id) { … } /* lookup free phy channel as descending priority */ static struct mmp_pdma_phy *lookup_phy(struct mmp_pdma_chan *pchan) { … } static void mmp_pdma_free_phy(struct mmp_pdma_chan *pchan) { … } /* * start_pending_queue - transfer any pending transactions * pending list ==> running list */ static void start_pending_queue(struct mmp_pdma_chan *chan) { … } /* desc->tx_list ==> pending list */ static dma_cookie_t mmp_pdma_tx_submit(struct dma_async_tx_descriptor *tx) { … } static struct mmp_pdma_desc_sw * mmp_pdma_alloc_descriptor(struct mmp_pdma_chan *chan) { … } /* * mmp_pdma_alloc_chan_resources - Allocate resources for DMA channel. * * This function will create a dma pool for descriptor allocation. * Request irq only when channel is requested * Return - The number of allocated descriptors. */ static int mmp_pdma_alloc_chan_resources(struct dma_chan *dchan) { … } static void mmp_pdma_free_desc_list(struct mmp_pdma_chan *chan, struct list_head *list) { … } static void mmp_pdma_free_chan_resources(struct dma_chan *dchan) { … } static struct dma_async_tx_descriptor * mmp_pdma_prep_memcpy(struct dma_chan *dchan, dma_addr_t dma_dst, dma_addr_t dma_src, size_t len, unsigned long flags) { … } static struct dma_async_tx_descriptor * mmp_pdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl, unsigned int sg_len, enum dma_transfer_direction dir, unsigned long flags, void *context) { … } static struct dma_async_tx_descriptor * mmp_pdma_prep_dma_cyclic(struct dma_chan *dchan, dma_addr_t buf_addr, size_t len, size_t period_len, enum dma_transfer_direction direction, unsigned long flags) { … } static int mmp_pdma_config_write(struct dma_chan *dchan, struct dma_slave_config *cfg, enum dma_transfer_direction direction) { … } static int mmp_pdma_config(struct dma_chan *dchan, struct dma_slave_config *cfg) { … } static int mmp_pdma_terminate_all(struct dma_chan *dchan) { … } static unsigned int mmp_pdma_residue(struct mmp_pdma_chan *chan, dma_cookie_t cookie) { … } static enum dma_status mmp_pdma_tx_status(struct dma_chan *dchan, dma_cookie_t cookie, struct dma_tx_state *txstate) { … } /* * mmp_pdma_issue_pending - Issue the DMA start command * pending list ==> running list */ static void mmp_pdma_issue_pending(struct dma_chan *dchan) { … } /* * dma_do_tasklet * Do call back * Start pending list */ static void dma_do_tasklet(struct tasklet_struct *t) { … } static void mmp_pdma_remove(struct platform_device *op) { … } static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev, int idx, int irq) { … } static const struct of_device_id mmp_pdma_dt_ids[] = …; MODULE_DEVICE_TABLE(of, mmp_pdma_dt_ids); static struct dma_chan *mmp_pdma_dma_xlate(struct of_phandle_args *dma_spec, struct of_dma *ofdma) { … } static int mmp_pdma_probe(struct platform_device *op) { … } static const struct platform_device_id mmp_pdma_id_table[] = …; static struct platform_driver mmp_pdma_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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