// SPDX-License-Identifier: GPL-2.0-only /* * ADMA driver for Nvidia's Tegra210 ADMA controller. * * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. */ #include <linux/clk.h> #include <linux/iopoll.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_dma.h> #include <linux/of_irq.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/slab.h> #include "virt-dma.h" #define ADMA_CH_CMD … #define ADMA_CH_STATUS … #define ADMA_CH_STATUS_XFER_EN … #define ADMA_CH_STATUS_XFER_PAUSED … #define ADMA_CH_INT_STATUS … #define ADMA_CH_INT_STATUS_XFER_DONE … #define ADMA_CH_INT_CLEAR … #define ADMA_CH_CTRL … #define ADMA_CH_CTRL_DIR(val) … #define ADMA_CH_CTRL_DIR_AHUB2MEM … #define ADMA_CH_CTRL_DIR_MEM2AHUB … #define ADMA_CH_CTRL_MODE_CONTINUOUS … #define ADMA_CH_CTRL_FLOWCTRL_EN … #define ADMA_CH_CTRL_XFER_PAUSE_SHIFT … #define ADMA_CH_CONFIG … #define ADMA_CH_CONFIG_SRC_BUF(val) … #define ADMA_CH_CONFIG_TRG_BUF(val) … #define ADMA_CH_CONFIG_BURST_SIZE_SHIFT … #define ADMA_CH_CONFIG_MAX_BURST_SIZE … #define ADMA_CH_CONFIG_WEIGHT_FOR_WRR(val) … #define ADMA_CH_CONFIG_MAX_BUFS … #define TEGRA186_ADMA_CH_CONFIG_OUTSTANDING_REQS(reqs) … #define ADMA_CH_FIFO_CTRL … #define ADMA_CH_TX_FIFO_SIZE_SHIFT … #define ADMA_CH_RX_FIFO_SIZE_SHIFT … #define ADMA_CH_LOWER_SRC_ADDR … #define ADMA_CH_LOWER_TRG_ADDR … #define ADMA_CH_TC … #define ADMA_CH_TC_COUNT_MASK … #define ADMA_CH_XFER_STATUS … #define ADMA_CH_XFER_STATUS_COUNT_MASK … #define ADMA_GLOBAL_CMD … #define ADMA_GLOBAL_SOFT_RESET … #define TEGRA_ADMA_BURST_COMPLETE_TIME … #define ADMA_CH_REG_FIELD_VAL(val, mask, shift) … struct tegra_adma; /* * struct tegra_adma_chip_data - Tegra chip specific data * @adma_get_burst_config: Function callback used to set DMA burst size. * @global_reg_offset: Register offset of DMA global register. * @global_int_clear: Register offset of DMA global interrupt clear. * @ch_req_tx_shift: Register offset for AHUB transmit channel select. * @ch_req_rx_shift: Register offset for AHUB receive channel select. * @ch_base_offset: Register offset of DMA channel registers. * @ch_fifo_ctrl: Default value for channel FIFO CTRL register. * @ch_req_mask: Mask for Tx or Rx channel select. * @ch_req_max: Maximum number of Tx or Rx channels available. * @ch_reg_size: Size of DMA channel register space. * @nr_channels: Number of DMA channels available. * @ch_fifo_size_mask: Mask for FIFO size field. * @sreq_index_offset: Slave channel index offset. * @has_outstanding_reqs: If DMA channel can have outstanding requests. */ struct tegra_adma_chip_data { … }; /* * struct tegra_adma_chan_regs - Tegra ADMA channel registers */ struct tegra_adma_chan_regs { … }; /* * struct tegra_adma_desc - Tegra ADMA descriptor to manage transfer requests. */ struct tegra_adma_desc { … }; /* * struct tegra_adma_chan - Tegra ADMA channel information */ struct tegra_adma_chan { … }; /* * struct tegra_adma - Tegra ADMA controller information */ struct tegra_adma { … }; static inline void tdma_write(struct tegra_adma *tdma, u32 reg, u32 val) { … } static inline u32 tdma_read(struct tegra_adma *tdma, u32 reg) { … } static inline void tdma_ch_write(struct tegra_adma_chan *tdc, u32 reg, u32 val) { … } static inline u32 tdma_ch_read(struct tegra_adma_chan *tdc, u32 reg) { … } static inline struct tegra_adma_chan *to_tegra_adma_chan(struct dma_chan *dc) { … } static inline struct tegra_adma_desc *to_tegra_adma_desc( struct dma_async_tx_descriptor *td) { … } static inline struct device *tdc2dev(struct tegra_adma_chan *tdc) { … } static void tegra_adma_desc_free(struct virt_dma_desc *vd) { … } static int tegra_adma_slave_config(struct dma_chan *dc, struct dma_slave_config *sconfig) { … } static int tegra_adma_init(struct tegra_adma *tdma) { … } static int tegra_adma_request_alloc(struct tegra_adma_chan *tdc, enum dma_transfer_direction direction) { … } static void tegra_adma_request_free(struct tegra_adma_chan *tdc) { … } static u32 tegra_adma_irq_status(struct tegra_adma_chan *tdc) { … } static u32 tegra_adma_irq_clear(struct tegra_adma_chan *tdc) { … } static void tegra_adma_stop(struct tegra_adma_chan *tdc) { … } static void tegra_adma_start(struct tegra_adma_chan *tdc) { … } static unsigned int tegra_adma_get_residue(struct tegra_adma_chan *tdc) { … } static irqreturn_t tegra_adma_isr(int irq, void *dev_id) { … } static void tegra_adma_issue_pending(struct dma_chan *dc) { … } static bool tegra_adma_is_paused(struct tegra_adma_chan *tdc) { … } static int tegra_adma_pause(struct dma_chan *dc) { … } static int tegra_adma_resume(struct dma_chan *dc) { … } static int tegra_adma_terminate_all(struct dma_chan *dc) { … } static enum dma_status tegra_adma_tx_status(struct dma_chan *dc, dma_cookie_t cookie, struct dma_tx_state *txstate) { … } static unsigned int tegra210_adma_get_burst_config(unsigned int burst_size) { … } static unsigned int tegra186_adma_get_burst_config(unsigned int burst_size) { … } static int tegra_adma_set_xfer_params(struct tegra_adma_chan *tdc, struct tegra_adma_desc *desc, dma_addr_t buf_addr, enum dma_transfer_direction direction) { … } static struct dma_async_tx_descriptor *tegra_adma_prep_dma_cyclic( struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len, size_t period_len, enum dma_transfer_direction direction, unsigned long flags) { … } static int tegra_adma_alloc_chan_resources(struct dma_chan *dc) { … } static void tegra_adma_free_chan_resources(struct dma_chan *dc) { … } static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec, struct of_dma *ofdma) { … } static int __maybe_unused tegra_adma_runtime_suspend(struct device *dev) { … } static int __maybe_unused tegra_adma_runtime_resume(struct device *dev) { … } static const struct tegra_adma_chip_data tegra210_chip_data = …; static const struct tegra_adma_chip_data tegra186_chip_data = …; static const struct of_device_id tegra_adma_of_match[] = …; MODULE_DEVICE_TABLE(of, tegra_adma_of_match); static int tegra_adma_probe(struct platform_device *pdev) { … } static void tegra_adma_remove(struct platform_device *pdev) { … } static const struct dev_pm_ops tegra_adma_dev_pm_ops = …; static struct platform_driver tegra_admac_driver = …; module_platform_driver(…) …; MODULE_ALIAS(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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