// SPDX-License-Identifier: GPL-2.0-only /* * timb_dma.c timberdale FPGA DMA driver * Copyright (c) 2010 Intel Corporation */ /* Supports: * Timberdale FPGA DMA engine */ #include <linux/dmaengine.h> #include <linux/dma-mapping.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/timb_dma.h> #include "dmaengine.h" #define DRIVER_NAME … /* Global DMA registers */ #define TIMBDMA_ACR … #define TIMBDMA_32BIT_ADDR … #define TIMBDMA_ISR … #define TIMBDMA_IPR … #define TIMBDMA_IER … /* Channel specific registers */ /* RX instances base addresses are 0x00, 0x40, 0x80 ... * TX instances base addresses are 0x18, 0x58, 0x98 ... */ #define TIMBDMA_INSTANCE_OFFSET … #define TIMBDMA_INSTANCE_TX_OFFSET … /* RX registers, relative the instance base */ #define TIMBDMA_OFFS_RX_DHAR … #define TIMBDMA_OFFS_RX_DLAR … #define TIMBDMA_OFFS_RX_LR … #define TIMBDMA_OFFS_RX_BLR … #define TIMBDMA_OFFS_RX_ER … #define TIMBDMA_RX_EN … /* bytes per Row, video specific register * which is placed after the TX registers... */ #define TIMBDMA_OFFS_RX_BPRR … /* TX registers, relative the instance base */ #define TIMBDMA_OFFS_TX_DHAR … #define TIMBDMA_OFFS_TX_DLAR … #define TIMBDMA_OFFS_TX_BLR … #define TIMBDMA_OFFS_TX_LR … #define TIMB_DMA_DESC_SIZE … struct timb_dma_desc { … }; struct timb_dma_chan { … }; struct timb_dma { … }; static struct device *chan2dev(struct dma_chan *chan) { … } static struct device *chan2dmadev(struct dma_chan *chan) { … } static struct timb_dma *tdchantotd(struct timb_dma_chan *td_chan) { … } /* Must be called with the spinlock held */ static void __td_enable_chan_irq(struct timb_dma_chan *td_chan) { … } /* Should be called with the spinlock held */ static bool __td_dma_done_ack(struct timb_dma_chan *td_chan) { … } static int td_fill_desc(struct timb_dma_chan *td_chan, u8 *dma_desc, struct scatterlist *sg, bool last) { … } /* Must be called with the spinlock held */ static void __td_start_dma(struct timb_dma_chan *td_chan) { … } static void __td_finish(struct timb_dma_chan *td_chan) { … } static u32 __td_ier_mask(struct timb_dma *td) { … } static void __td_start_next(struct timb_dma_chan *td_chan) { … } static dma_cookie_t td_tx_submit(struct dma_async_tx_descriptor *txd) { … } static struct timb_dma_desc *td_alloc_init_desc(struct timb_dma_chan *td_chan) { … } static void td_free_desc(struct timb_dma_desc *td_desc) { … } static void td_desc_put(struct timb_dma_chan *td_chan, struct timb_dma_desc *td_desc) { … } static struct timb_dma_desc *td_desc_get(struct timb_dma_chan *td_chan) { … } static int td_alloc_chan_resources(struct dma_chan *chan) { … } static void td_free_chan_resources(struct dma_chan *chan) { … } static enum dma_status td_tx_status(struct dma_chan *chan, dma_cookie_t cookie, struct dma_tx_state *txstate) { … } static void td_issue_pending(struct dma_chan *chan) { … } static struct dma_async_tx_descriptor *td_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len, enum dma_transfer_direction direction, unsigned long flags, void *context) { … } static int td_terminate_all(struct dma_chan *chan) { … } static void td_tasklet(struct tasklet_struct *t) { … } static irqreturn_t td_irq(int irq, void *devid) { … } static int td_probe(struct platform_device *pdev) { … } static void td_remove(struct platform_device *pdev) { … } static struct platform_driver td_driver = …; module_platform_driver(…) …; MODULE_LICENSE(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_ALIAS(…) …;
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