// SPDX-License-Identifier: GPL-2.0 /* * MediaTek UART APDMA driver. * * Copyright (c) 2019 MediaTek Inc. * Author: Long Cheng <[email protected]> */ #include <linux/clk.h> #include <linux/dmaengine.h> #include <linux/dma-mapping.h> #include <linux/err.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/iopoll.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/module.h> #include <linux/of_dma.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/slab.h> #include <linux/spinlock.h> #include "../virt-dma.h" /* The default number of virtual channel */ #define MTK_UART_APDMA_NR_VCHANS … #define VFF_EN_B … #define VFF_STOP_B … #define VFF_FLUSH_B … #define VFF_4G_EN_B … /* rx valid size >= vff thre */ #define VFF_RX_INT_EN_B … /* tx left size >= vff thre */ #define VFF_TX_INT_EN_B … #define VFF_WARM_RST_B … #define VFF_RX_INT_CLR_B … #define VFF_TX_INT_CLR_B … #define VFF_STOP_CLR_B … #define VFF_EN_CLR_B … #define VFF_INT_EN_CLR_B … #define VFF_4G_SUPPORT_CLR_B … /* * interrupt trigger level for tx * if threshold is n, no polling is required to start tx. * otherwise need polling VFF_FLUSH. */ #define VFF_TX_THRE(n) … /* interrupt trigger level for rx */ #define VFF_RX_THRE(n) … #define VFF_RING_SIZE … /* invert this bit when wrap ring head again */ #define VFF_RING_WRAP … #define VFF_INT_FLAG … #define VFF_INT_EN … #define VFF_EN … #define VFF_RST … #define VFF_STOP … #define VFF_FLUSH … #define VFF_ADDR … #define VFF_LEN … #define VFF_THRE … #define VFF_WPT … #define VFF_RPT … /* TX: the buffer size HW can read. RX: the buffer size SW can read. */ #define VFF_VALID_SIZE … /* TX: the buffer size SW can write. RX: the buffer size HW can write. */ #define VFF_LEFT_SIZE … #define VFF_DEBUG_STATUS … #define VFF_4G_SUPPORT … struct mtk_uart_apdmadev { … }; struct mtk_uart_apdma_desc { … }; struct mtk_chan { … }; static inline struct mtk_uart_apdmadev * to_mtk_uart_apdma_dev(struct dma_device *d) { … } static inline struct mtk_chan *to_mtk_uart_apdma_chan(struct dma_chan *c) { … } static inline struct mtk_uart_apdma_desc *to_mtk_uart_apdma_desc (struct dma_async_tx_descriptor *t) { … } static void mtk_uart_apdma_write(struct mtk_chan *c, unsigned int reg, unsigned int val) { … } static unsigned int mtk_uart_apdma_read(struct mtk_chan *c, unsigned int reg) { … } static void mtk_uart_apdma_desc_free(struct virt_dma_desc *vd) { … } static void mtk_uart_apdma_start_tx(struct mtk_chan *c) { … } static void mtk_uart_apdma_start_rx(struct mtk_chan *c) { … } static void mtk_uart_apdma_tx_handler(struct mtk_chan *c) { … } static void mtk_uart_apdma_rx_handler(struct mtk_chan *c) { … } static void mtk_uart_apdma_chan_complete_handler(struct mtk_chan *c) { … } static irqreturn_t mtk_uart_apdma_irq_handler(int irq, void *dev_id) { … } static int mtk_uart_apdma_alloc_chan_resources(struct dma_chan *chan) { … } static void mtk_uart_apdma_free_chan_resources(struct dma_chan *chan) { … } static enum dma_status mtk_uart_apdma_tx_status(struct dma_chan *chan, dma_cookie_t cookie, struct dma_tx_state *txstate) { … } /* * dmaengine_prep_slave_single will call the function. and sglen is 1. * 8250 uart using one ring buffer, and deal with one sg. */ static struct dma_async_tx_descriptor *mtk_uart_apdma_prep_slave_sg (struct dma_chan *chan, struct scatterlist *sgl, unsigned int sglen, enum dma_transfer_direction dir, unsigned long tx_flags, void *context) { … } static void mtk_uart_apdma_issue_pending(struct dma_chan *chan) { … } static int mtk_uart_apdma_slave_config(struct dma_chan *chan, struct dma_slave_config *config) { … } static int mtk_uart_apdma_terminate_all(struct dma_chan *chan) { … } static int mtk_uart_apdma_device_pause(struct dma_chan *chan) { … } static void mtk_uart_apdma_free(struct mtk_uart_apdmadev *mtkd) { … } static const struct of_device_id mtk_uart_apdma_match[] = …; MODULE_DEVICE_TABLE(of, mtk_uart_apdma_match); static int mtk_uart_apdma_probe(struct platform_device *pdev) { … } static void mtk_uart_apdma_remove(struct platform_device *pdev) { … } #ifdef CONFIG_PM_SLEEP static int mtk_uart_apdma_suspend(struct device *dev) { … } static int mtk_uart_apdma_resume(struct device *dev) { … } #endif /* CONFIG_PM_SLEEP */ #ifdef CONFIG_PM static int mtk_uart_apdma_runtime_suspend(struct device *dev) { … } static int mtk_uart_apdma_runtime_resume(struct device *dev) { … } #endif /* CONFIG_PM */ static const struct dev_pm_ops mtk_uart_apdma_pm_ops = …; static struct platform_driver mtk_uart_apdma_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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