+++ /dev/null
-/*
- * DMA driver for Xilinx Video DMA Engine
- *
- * Copyright (C) 2010-2014 Xilinx, Inc. All rights reserved.
- *
- * Based on the Freescale DMA driver.
- *
- * Description:
- * The AXI Video Direct Memory Access (AXI VDMA) core is a soft Xilinx IP
- * core that provides high-bandwidth direct memory access between memory
- * and AXI4-Stream type video target peripherals. The core provides efficient
- * two dimensional DMA operations with independent asynchronous read (S2MM)
- * and write (MM2S) channel operation. It can be configured to have either
- * one channel or two channels. If configured as two channels, one is to
- * transmit to the video device (MM2S) and another is to receive from the
- * video device (S2MM). Initialization, status, interrupt and management
- * registers are accessed through an AXI4-Lite slave interface.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- */
-
-#include <linux/bitops.h>
-#include <linux/dmapool.h>
-#include <linux/dma/xilinx_dma.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/iopoll.h>
-#include <linux/module.h>
-#include <linux/of_address.h>
-#include <linux/of_dma.h>
-#include <linux/of_platform.h>
-#include <linux/of_irq.h>
-#include <linux/slab.h>
-
-#include "../dmaengine.h"
-
-/* Register/Descriptor Offsets */
-#define XILINX_VDMA_MM2S_CTRL_OFFSET 0x0000
-#define XILINX_VDMA_S2MM_CTRL_OFFSET 0x0030
-#define XILINX_VDMA_MM2S_DESC_OFFSET 0x0050
-#define XILINX_VDMA_S2MM_DESC_OFFSET 0x00a0
-
-/* Control Registers */
-#define XILINX_VDMA_REG_DMACR 0x0000
-#define XILINX_VDMA_DMACR_DELAY_MAX 0xff
-#define XILINX_VDMA_DMACR_DELAY_SHIFT 24
-#define XILINX_VDMA_DMACR_FRAME_COUNT_MAX 0xff
-#define XILINX_VDMA_DMACR_FRAME_COUNT_SHIFT 16
-#define XILINX_VDMA_DMACR_ERR_IRQ BIT(14)
-#define XILINX_VDMA_DMACR_DLY_CNT_IRQ BIT(13)
-#define XILINX_VDMA_DMACR_FRM_CNT_IRQ BIT(12)
-#define XILINX_VDMA_DMACR_MASTER_SHIFT 8
-#define XILINX_VDMA_DMACR_FSYNCSRC_SHIFT 5
-#define XILINX_VDMA_DMACR_FRAMECNT_EN BIT(4)
-#define XILINX_VDMA_DMACR_GENLOCK_EN BIT(3)
-#define XILINX_VDMA_DMACR_RESET BIT(2)
-#define XILINX_VDMA_DMACR_CIRC_EN BIT(1)
-#define XILINX_VDMA_DMACR_RUNSTOP BIT(0)
-#define XILINX_VDMA_DMACR_FSYNCSRC_MASK GENMASK(6, 5)
-
-#define XILINX_VDMA_REG_DMASR 0x0004
-#define XILINX_VDMA_DMASR_EOL_LATE_ERR BIT(15)
-#define XILINX_VDMA_DMASR_ERR_IRQ BIT(14)
-#define XILINX_VDMA_DMASR_DLY_CNT_IRQ BIT(13)
-#define XILINX_VDMA_DMASR_FRM_CNT_IRQ BIT(12)
-#define XILINX_VDMA_DMASR_SOF_LATE_ERR BIT(11)
-#define XILINX_VDMA_DMASR_SG_DEC_ERR BIT(10)
-#define XILINX_VDMA_DMASR_SG_SLV_ERR BIT(9)
-#define XILINX_VDMA_DMASR_EOF_EARLY_ERR BIT(8)
-#define XILINX_VDMA_DMASR_SOF_EARLY_ERR BIT(7)
-#define XILINX_VDMA_DMASR_DMA_DEC_ERR BIT(6)
-#define XILINX_VDMA_DMASR_DMA_SLAVE_ERR BIT(5)
-#define XILINX_VDMA_DMASR_DMA_INT_ERR BIT(4)
-#define XILINX_VDMA_DMASR_IDLE BIT(1)
-#define XILINX_VDMA_DMASR_HALTED BIT(0)
-#define XILINX_VDMA_DMASR_DELAY_MASK GENMASK(31, 24)
-#define XILINX_VDMA_DMASR_FRAME_COUNT_MASK GENMASK(23, 16)
-
-#define XILINX_VDMA_REG_CURDESC 0x0008
-#define XILINX_VDMA_REG_TAILDESC 0x0010
-#define XILINX_VDMA_REG_REG_INDEX 0x0014
-#define XILINX_VDMA_REG_FRMSTORE 0x0018
-#define XILINX_VDMA_REG_THRESHOLD 0x001c
-#define XILINX_VDMA_REG_FRMPTR_STS 0x0024
-#define XILINX_VDMA_REG_PARK_PTR 0x0028
-#define XILINX_VDMA_PARK_PTR_WR_REF_SHIFT 8
-#define XILINX_VDMA_PARK_PTR_RD_REF_SHIFT 0
-#define XILINX_VDMA_REG_VDMA_VERSION 0x002c
-
-/* Register Direct Mode Registers */
-#define XILINX_VDMA_REG_VSIZE 0x0000
-#define XILINX_VDMA_REG_HSIZE 0x0004
-
-#define XILINX_VDMA_REG_FRMDLY_STRIDE 0x0008
-#define XILINX_VDMA_FRMDLY_STRIDE_FRMDLY_SHIFT 24
-#define XILINX_VDMA_FRMDLY_STRIDE_STRIDE_SHIFT 0
-
-#define XILINX_VDMA_REG_START_ADDRESS(n) (0x000c + 4 * (n))
-
-/* HW specific definitions */
-#define XILINX_VDMA_MAX_CHANS_PER_DEVICE 0x2
-
-#define XILINX_VDMA_DMAXR_ALL_IRQ_MASK \
- (XILINX_VDMA_DMASR_FRM_CNT_IRQ | \
- XILINX_VDMA_DMASR_DLY_CNT_IRQ | \
- XILINX_VDMA_DMASR_ERR_IRQ)
-
-#define XILINX_VDMA_DMASR_ALL_ERR_MASK \
- (XILINX_VDMA_DMASR_EOL_LATE_ERR | \
- XILINX_VDMA_DMASR_SOF_LATE_ERR | \
- XILINX_VDMA_DMASR_SG_DEC_ERR | \
- XILINX_VDMA_DMASR_SG_SLV_ERR | \
- XILINX_VDMA_DMASR_EOF_EARLY_ERR | \
- XILINX_VDMA_DMASR_SOF_EARLY_ERR | \
- XILINX_VDMA_DMASR_DMA_DEC_ERR | \
- XILINX_VDMA_DMASR_DMA_SLAVE_ERR | \
- XILINX_VDMA_DMASR_DMA_INT_ERR)
-
-/*
- * Recoverable errors are DMA Internal error, SOF Early, EOF Early
- * and SOF Late. They are only recoverable when C_FLUSH_ON_FSYNC
- * is enabled in the h/w system.
- */
-#define XILINX_VDMA_DMASR_ERR_RECOVER_MASK \
- (XILINX_VDMA_DMASR_SOF_LATE_ERR | \
- XILINX_VDMA_DMASR_EOF_EARLY_ERR | \
- XILINX_VDMA_DMASR_SOF_EARLY_ERR | \
- XILINX_VDMA_DMASR_DMA_INT_ERR)
-
-/* Axi VDMA Flush on Fsync bits */
-#define XILINX_VDMA_FLUSH_S2MM 3
-#define XILINX_VDMA_FLUSH_MM2S 2
-#define XILINX_VDMA_FLUSH_BOTH 1
-
-/* Delay loop counter to prevent hardware failure */
-#define XILINX_VDMA_LOOP_COUNT 1000000
-
-/**
- * struct xilinx_vdma_desc_hw - Hardware Descriptor
- * @next_desc: Next Descriptor Pointer @0x00
- * @pad1: Reserved @0x04
- * @buf_addr: Buffer address @0x08
- * @pad2: Reserved @0x0C
- * @vsize: Vertical Size @0x10
- * @hsize: Horizontal Size @0x14
- * @stride: Number of bytes between the first
- * pixels of each horizontal line @0x18
- */
-struct xilinx_vdma_desc_hw {
- u32 next_desc;
- u32 pad1;
- u32 buf_addr;
- u32 pad2;
- u32 vsize;
- u32 hsize;
- u32 stride;
-} __aligned(64);
-
-/**
- * struct xilinx_vdma_tx_segment - Descriptor segment
- * @hw: Hardware descriptor
- * @node: Node in the descriptor segments list
- * @phys: Physical address of segment
- */
-struct xilinx_vdma_tx_segment {
- struct xilinx_vdma_desc_hw hw;
- struct list_head node;
- dma_addr_t phys;
-} __aligned(64);
-
-/**
- * struct xilinx_vdma_tx_descriptor - Per Transaction structure
- * @async_tx: Async transaction descriptor
- * @segments: TX segments list
- * @node: Node in the channel descriptors list
- */
-struct xilinx_vdma_tx_descriptor {
- struct dma_async_tx_descriptor async_tx;
- struct list_head segments;
- struct list_head node;
-};
-
-/**
- * struct xilinx_vdma_chan - Driver specific VDMA channel structure
- * @xdev: Driver specific device structure
- * @ctrl_offset: Control registers offset
- * @desc_offset: TX descriptor registers offset
- * @lock: Descriptor operation lock
- * @pending_list: Descriptors waiting
- * @active_list: Descriptors ready to submit
- * @done_list: Complete descriptors
- * @common: DMA common channel
- * @desc_pool: Descriptors pool
- * @dev: The dma device
- * @irq: Channel IRQ
- * @id: Channel ID
- * @direction: Transfer direction
- * @num_frms: Number of frames
- * @has_sg: Support scatter transfers
- * @genlock: Support genlock mode
- * @err: Channel has errors
- * @tasklet: Cleanup work after irq
- * @config: Device configuration info
- * @flush_on_fsync: Flush on Frame sync
- * @desc_pendingcount: Descriptor pending count
- */
-struct xilinx_vdma_chan {
- struct xilinx_vdma_device *xdev;
- u32 ctrl_offset;
- u32 desc_offset;
- spinlock_t lock;
- struct list_head pending_list;
- struct list_head active_list;
- struct list_head done_list;
- struct dma_chan common;
- struct dma_pool *desc_pool;
- struct device *dev;
- int irq;
- int id;
- enum dma_transfer_direction direction;
- int num_frms;
- bool has_sg;
- bool genlock;
- bool err;
- struct tasklet_struct tasklet;
- struct xilinx_vdma_config config;
- bool flush_on_fsync;
- u32 desc_pendingcount;
-};
-
-/**
- * struct xilinx_vdma_device - VDMA device structure
- * @regs: I/O mapped base address
- * @dev: Device Structure
- * @common: DMA device structure
- * @chan: Driver specific VDMA channel
- * @has_sg: Specifies whether Scatter-Gather is present or not
- * @flush_on_fsync: Flush on frame sync
- */
-struct xilinx_vdma_device {
- void __iomem *regs;
- struct device *dev;
- struct dma_device common;
- struct xilinx_vdma_chan *chan[XILINX_VDMA_MAX_CHANS_PER_DEVICE];
- bool has_sg;
- u32 flush_on_fsync;
-};
-
-/* Macros */
-#define to_xilinx_chan(chan) \
- container_of(chan, struct xilinx_vdma_chan, common)
-#define to_vdma_tx_descriptor(tx) \
- container_of(tx, struct xilinx_vdma_tx_descriptor, async_tx)
-#define xilinx_vdma_poll_timeout(chan, reg, val, cond, delay_us, timeout_us) \
- readl_poll_timeout(chan->xdev->regs + chan->ctrl_offset + reg, val, \
- cond, delay_us, timeout_us)
-
-/* IO accessors */
-static inline u32 vdma_read(struct xilinx_vdma_chan *chan, u32 reg)
-{
- return ioread32(chan->xdev->regs + reg);
-}
-
-static inline void vdma_write(struct xilinx_vdma_chan *chan, u32 reg, u32 value)
-{
- iowrite32(value, chan->xdev->regs + reg);
-}
-
-static inline void vdma_desc_write(struct xilinx_vdma_chan *chan, u32 reg,
- u32 value)
-{
- vdma_write(chan, chan->desc_offset + reg, value);
-}
-
-static inline u32 vdma_ctrl_read(struct xilinx_vdma_chan *chan, u32 reg)
-{
- return vdma_read(chan, chan->ctrl_offset + reg);
-}
-
-static inline void vdma_ctrl_write(struct xilinx_vdma_chan *chan, u32 reg,
- u32 value)
-{
- vdma_write(chan, chan->ctrl_offset + reg, value);
-}
-
-static inline void vdma_ctrl_clr(struct xilinx_vdma_chan *chan, u32 reg,
- u32 clr)
-{
- vdma_ctrl_write(chan, reg, vdma_ctrl_read(chan, reg) & ~clr);
-}
-
-static inline void vdma_ctrl_set(struct xilinx_vdma_chan *chan, u32 reg,
- u32 set)
-{
- vdma_ctrl_write(chan, reg, vdma_ctrl_read(chan, reg) | set);
-}
-
-/* -----------------------------------------------------------------------------
- * Descriptors and segments alloc and free
- */
-
-/**
- * xilinx_vdma_alloc_tx_segment - Allocate transaction segment
- * @chan: Driver specific VDMA channel
- *
- * Return: The allocated segment on success and NULL on failure.
- */
-static struct xilinx_vdma_tx_segment *
-xilinx_vdma_alloc_tx_segment(struct xilinx_vdma_chan *chan)
-{
- struct xilinx_vdma_tx_segment *segment;
- dma_addr_t phys;
-
- segment = dma_pool_alloc(chan->desc_pool, GFP_ATOMIC, &phys);
- if (!segment)
- return NULL;
-
- memset(segment, 0, sizeof(*segment));
- segment->phys = phys;
-
- return segment;
-}
-
-/**
- * xilinx_vdma_free_tx_segment - Free transaction segment
- * @chan: Driver specific VDMA channel
- * @segment: VDMA transaction segment
- */
-static void xilinx_vdma_free_tx_segment(struct xilinx_vdma_chan *chan,
- struct xilinx_vdma_tx_segment *segment)
-{
- dma_pool_free(chan->desc_pool, segment, segment->phys);
-}
-
-/**
- * xilinx_vdma_tx_descriptor - Allocate transaction descriptor
- * @chan: Driver specific VDMA channel
- *
- * Return: The allocated descriptor on success and NULL on failure.
- */
-static struct xilinx_vdma_tx_descriptor *
-xilinx_vdma_alloc_tx_descriptor(struct xilinx_vdma_chan *chan)
-{
- struct xilinx_vdma_tx_descriptor *desc;
-
- desc = kzalloc(sizeof(*desc), GFP_KERNEL);
- if (!desc)
- return NULL;
-
- INIT_LIST_HEAD(&desc->segments);
-
- return desc;
-}
-
-/**
- * xilinx_vdma_free_tx_descriptor - Free transaction descriptor
- * @chan: Driver specific VDMA channel
- * @desc: VDMA transaction descriptor
- */
-static void
-xilinx_vdma_free_tx_descriptor(struct xilinx_vdma_chan *chan,
- struct xilinx_vdma_tx_descriptor *desc)
-{
- struct xilinx_vdma_tx_segment *segment, *next;
-
- if (!desc)
- return;
-
- list_for_each_entry_safe(segment, next, &desc->segments, node) {
- list_del(&segment->node);
- xilinx_vdma_free_tx_segment(chan, segment);
- }
-
- kfree(desc);
-}
-
-/* Required functions */
-
-/**
- * xilinx_vdma_free_desc_list - Free descriptors list
- * @chan: Driver specific VDMA channel
- * @list: List to parse and delete the descriptor
- */
-static void xilinx_vdma_free_desc_list(struct xilinx_vdma_chan *chan,
- struct list_head *list)
-{
- struct xilinx_vdma_tx_descriptor *desc, *next;
-
- list_for_each_entry_safe(desc, next, list, node) {
- list_del(&desc->node);
- xilinx_vdma_free_tx_descriptor(chan, desc);
- }
-}
-
-/**
- * xilinx_vdma_free_descriptors - Free channel descriptors
- * @chan: Driver specific VDMA channel
- */
-static void xilinx_vdma_free_descriptors(struct xilinx_vdma_chan *chan)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&chan->lock, flags);
-
- xilinx_vdma_free_desc_list(chan, &chan->pending_list);
- xilinx_vdma_free_desc_list(chan, &chan->done_list);
- xilinx_vdma_free_desc_list(chan, &chan->active_list);
-
- spin_unlock_irqrestore(&chan->lock, flags);
-}
-
-/**
- * xilinx_vdma_free_chan_resources - Free channel resources
- * @dchan: DMA channel
- */
-static void xilinx_vdma_free_chan_resources(struct dma_chan *dchan)
-{
- struct xilinx_vdma_chan *chan = to_xilinx_chan(dchan);
-
- dev_dbg(chan->dev, "Free all channel resources.\n");
-
- xilinx_vdma_free_descriptors(chan);
- dma_pool_destroy(chan->desc_pool);
- chan->desc_pool = NULL;
-}
-
-/**
- * xilinx_vdma_chan_desc_cleanup - Clean channel descriptors
- * @chan: Driver specific VDMA channel
- */
-static void xilinx_vdma_chan_desc_cleanup(struct xilinx_vdma_chan *chan)
-{
- struct xilinx_vdma_tx_descriptor *desc, *next;
- unsigned long flags;
-
- spin_lock_irqsave(&chan->lock, flags);
-
- list_for_each_entry_safe(desc, next, &chan->done_list, node) {
- dma_async_tx_callback callback;
- void *callback_param;
-
- /* Remove from the list of running transactions */
- list_del(&desc->node);
-
- /* Run the link descriptor callback function */
- callback = desc->async_tx.callback;
- callback_param = desc->async_tx.callback_param;
- if (callback) {
- spin_unlock_irqrestore(&chan->lock, flags);
- callback(callback_param);
- spin_lock_irqsave(&chan->lock, flags);
- }
-
- /* Run any dependencies, then free the descriptor */
- dma_run_dependencies(&desc->async_tx);
- xilinx_vdma_free_tx_descriptor(chan, desc);
- }
-
- spin_unlock_irqrestore(&chan->lock, flags);
-}
-
-/**
- * xilinx_vdma_do_tasklet - Schedule completion tasklet
- * @data: Pointer to the Xilinx VDMA channel structure
- */
-static void xilinx_vdma_do_tasklet(unsigned long data)
-{
- struct xilinx_vdma_chan *chan = (struct xilinx_vdma_chan *)data;
-
- xilinx_vdma_chan_desc_cleanup(chan);
-}
-
-/**
- * xilinx_vdma_alloc_chan_resources - Allocate channel resources
- * @dchan: DMA channel
- *
- * Return: '0' on success and failure value on error
- */
-static int xilinx_vdma_alloc_chan_resources(struct dma_chan *dchan)
-{
- struct xilinx_vdma_chan *chan = to_xilinx_chan(dchan);
-
- /* Has this channel already been allocated? */
- if (chan->desc_pool)
- return 0;
-
- /*
- * We need the descriptor to be aligned to 64bytes
- * for meeting Xilinx VDMA specification requirement.
- */
- chan->desc_pool = dma_pool_create("xilinx_vdma_desc_pool",
- chan->dev,
- sizeof(struct xilinx_vdma_tx_segment),
- __alignof__(struct xilinx_vdma_tx_segment), 0);
- if (!chan->desc_pool) {
- dev_err(chan->dev,
- "unable to allocate channel %d descriptor pool\n",
- chan->id);
- return -ENOMEM;
- }
-
- dma_cookie_init(dchan);
- return 0;
-}
-
-/**
- * xilinx_vdma_tx_status - Get VDMA transaction status
- * @dchan: DMA channel
- * @cookie: Transaction identifier
- * @txstate: Transaction state
- *
- * Return: DMA transaction status
- */
-static enum dma_status xilinx_vdma_tx_status(struct dma_chan *dchan,
- dma_cookie_t cookie,
- struct dma_tx_state *txstate)
-{
- return dma_cookie_status(dchan, cookie, txstate);
-}
-
-/**
- * xilinx_vdma_is_running - Check if VDMA channel is running
- * @chan: Driver specific VDMA channel
- *
- * Return: '1' if running, '0' if not.
- */
-static bool xilinx_vdma_is_running(struct xilinx_vdma_chan *chan)
-{
- return !(vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR) &
- XILINX_VDMA_DMASR_HALTED) &&
- (vdma_ctrl_read(chan, XILINX_VDMA_REG_DMACR) &
- XILINX_VDMA_DMACR_RUNSTOP);
-}
-
-/**
- * xilinx_vdma_is_idle - Check if VDMA channel is idle
- * @chan: Driver specific VDMA channel
- *
- * Return: '1' if idle, '0' if not.
- */
-static bool xilinx_vdma_is_idle(struct xilinx_vdma_chan *chan)
-{
- return vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR) &
- XILINX_VDMA_DMASR_IDLE;
-}
-
-/**
- * xilinx_vdma_halt - Halt VDMA channel
- * @chan: Driver specific VDMA channel
- */
-static void xilinx_vdma_halt(struct xilinx_vdma_chan *chan)
-{
- int err;
- u32 val;
-
- vdma_ctrl_clr(chan, XILINX_VDMA_REG_DMACR, XILINX_VDMA_DMACR_RUNSTOP);
-
- /* Wait for the hardware to halt */
- err = xilinx_vdma_poll_timeout(chan, XILINX_VDMA_REG_DMASR, val,
- (val & XILINX_VDMA_DMASR_HALTED), 0,
- XILINX_VDMA_LOOP_COUNT);
-
- if (err) {
- dev_err(chan->dev, "Cannot stop channel %p: %x\n",
- chan, vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR));
- chan->err = true;
- }
-
- return;
-}
-
-/**
- * xilinx_vdma_start - Start VDMA channel
- * @chan: Driver specific VDMA channel
- */
-static void xilinx_vdma_start(struct xilinx_vdma_chan *chan)
-{
- int err;
- u32 val;
-
- vdma_ctrl_set(chan, XILINX_VDMA_REG_DMACR, XILINX_VDMA_DMACR_RUNSTOP);
-
- /* Wait for the hardware to start */
- err = xilinx_vdma_poll_timeout(chan, XILINX_VDMA_REG_DMASR, val,
- !(val & XILINX_VDMA_DMASR_HALTED), 0,
- XILINX_VDMA_LOOP_COUNT);
-
- if (err) {
- dev_err(chan->dev, "Cannot start channel %p: %x\n",
- chan, vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR));
-
- chan->err = true;
- }
-
- return;
-}
-
-/**
- * xilinx_vdma_start_transfer - Starts VDMA transfer
- * @chan: Driver specific channel struct pointer
- */
-static void xilinx_vdma_start_transfer(struct xilinx_vdma_chan *chan)
-{
- struct xilinx_vdma_config *config = &chan->config;
- struct xilinx_vdma_tx_descriptor *desc, *tail_desc;
- u32 reg;
- struct xilinx_vdma_tx_segment *tail_segment;
-
- /* This function was invoked with lock held */
- if (chan->err)
- return;
-
- if (list_empty(&chan->pending_list))
- return;
-
- desc = list_first_entry(&chan->pending_list,
- struct xilinx_vdma_tx_descriptor, node);
- tail_desc = list_last_entry(&chan->pending_list,
- struct xilinx_vdma_tx_descriptor, node);
-
- tail_segment = list_last_entry(&tail_desc->segments,
- struct xilinx_vdma_tx_segment, node);
-
- /* If it is SG mode and hardware is busy, cannot submit */
- if (chan->has_sg && xilinx_vdma_is_running(chan) &&
- !xilinx_vdma_is_idle(chan)) {
- dev_dbg(chan->dev, "DMA controller still busy\n");
- return;
- }
-
- /*
- * If hardware is idle, then all descriptors on the running lists are
- * done, start new transfers
- */
- if (chan->has_sg)
- vdma_ctrl_write(chan, XILINX_VDMA_REG_CURDESC,
- desc->async_tx.phys);
-
- /* Configure the hardware using info in the config structure */
- reg = vdma_ctrl_read(chan, XILINX_VDMA_REG_DMACR);
-
- if (config->frm_cnt_en)
- reg |= XILINX_VDMA_DMACR_FRAMECNT_EN;
- else
- reg &= ~XILINX_VDMA_DMACR_FRAMECNT_EN;
-
- /* Configure channel to allow number frame buffers */
- vdma_ctrl_write(chan, XILINX_VDMA_REG_FRMSTORE,
- chan->desc_pendingcount);
-
- /*
- * With SG, start with circular mode, so that BDs can be fetched.
- * In direct register mode, if not parking, enable circular mode
- */
- if (chan->has_sg || !config->park)
- reg |= XILINX_VDMA_DMACR_CIRC_EN;
-
- if (config->park)
- reg &= ~XILINX_VDMA_DMACR_CIRC_EN;
-
- vdma_ctrl_write(chan, XILINX_VDMA_REG_DMACR, reg);
-
- if (config->park && (config->park_frm >= 0) &&
- (config->park_frm < chan->num_frms)) {
- if (chan->direction == DMA_MEM_TO_DEV)
- vdma_write(chan, XILINX_VDMA_REG_PARK_PTR,
- config->park_frm <<
- XILINX_VDMA_PARK_PTR_RD_REF_SHIFT);
- else
- vdma_write(chan, XILINX_VDMA_REG_PARK_PTR,
- config->park_frm <<
- XILINX_VDMA_PARK_PTR_WR_REF_SHIFT);
- }
-
- /* Start the hardware */
- xilinx_vdma_start(chan);
-
- if (chan->err)
- return;
-
- /* Start the transfer */
- if (chan->has_sg) {
- vdma_ctrl_write(chan, XILINX_VDMA_REG_TAILDESC,
- tail_segment->phys);
- } else {
- struct xilinx_vdma_tx_segment *segment, *last = NULL;
- int i = 0;
-
- list_for_each_entry(desc, &chan->pending_list, node) {
- segment = list_first_entry(&desc->segments,
- struct xilinx_vdma_tx_segment, node);
- vdma_desc_write(chan,
- XILINX_VDMA_REG_START_ADDRESS(i++),
- segment->hw.buf_addr);
- last = segment;
- }
-
- if (!last)
- return;
-
- /* HW expects these parameters to be same for one transaction */
- vdma_desc_write(chan, XILINX_VDMA_REG_HSIZE, last->hw.hsize);
- vdma_desc_write(chan, XILINX_VDMA_REG_FRMDLY_STRIDE,
- last->hw.stride);
- vdma_desc_write(chan, XILINX_VDMA_REG_VSIZE, last->hw.vsize);
- }
-
- list_splice_tail_init(&chan->pending_list, &chan->active_list);
- chan->desc_pendingcount = 0;
-}
-
-/**
- * xilinx_vdma_issue_pending - Issue pending transactions
- * @dchan: DMA channel
- */
-static void xilinx_vdma_issue_pending(struct dma_chan *dchan)
-{
- struct xilinx_vdma_chan *chan = to_xilinx_chan(dchan);
- unsigned long flags;
-
- spin_lock_irqsave(&chan->lock, flags);
- xilinx_vdma_start_transfer(chan);
- spin_unlock_irqrestore(&chan->lock, flags);
-}
-
-/**
- * xilinx_vdma_complete_descriptor - Mark the active descriptor as complete
- * @chan : xilinx DMA channel
- *
- * CONTEXT: hardirq
- */
-static void xilinx_vdma_complete_descriptor(struct xilinx_vdma_chan *chan)
-{
- struct xilinx_vdma_tx_descriptor *desc, *next;
-
- /* This function was invoked with lock held */
- if (list_empty(&chan->active_list))
- return;
-
- list_for_each_entry_safe(desc, next, &chan->active_list, node) {
- list_del(&desc->node);
- dma_cookie_complete(&desc->async_tx);
- list_add_tail(&desc->node, &chan->done_list);
- }
-}
-
-/**
- * xilinx_vdma_reset - Reset VDMA channel
- * @chan: Driver specific VDMA channel
- *
- * Return: '0' on success and failure value on error
- */
-static int xilinx_vdma_reset(struct xilinx_vdma_chan *chan)
-{
- int err;
- u32 tmp;
-
- vdma_ctrl_set(chan, XILINX_VDMA_REG_DMACR, XILINX_VDMA_DMACR_RESET);
-
- /* Wait for the hardware to finish reset */
- err = xilinx_vdma_poll_timeout(chan, XILINX_VDMA_REG_DMACR, tmp,
- !(tmp & XILINX_VDMA_DMACR_RESET), 0,
- XILINX_VDMA_LOOP_COUNT);
-
- if (err) {
- dev_err(chan->dev, "reset timeout, cr %x, sr %x\n",
- vdma_ctrl_read(chan, XILINX_VDMA_REG_DMACR),
- vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR));
- return -ETIMEDOUT;
- }
-
- chan->err = false;
-
- return err;
-}
-
-/**
- * xilinx_vdma_chan_reset - Reset VDMA channel and enable interrupts
- * @chan: Driver specific VDMA channel
- *
- * Return: '0' on success and failure value on error
- */
-static int xilinx_vdma_chan_reset(struct xilinx_vdma_chan *chan)
-{
- int err;
-
- /* Reset VDMA */
- err = xilinx_vdma_reset(chan);
- if (err)
- return err;
-
- /* Enable interrupts */
- vdma_ctrl_set(chan, XILINX_VDMA_REG_DMACR,
- XILINX_VDMA_DMAXR_ALL_IRQ_MASK);
-
- return 0;
-}
-
-/**
- * xilinx_vdma_irq_handler - VDMA Interrupt handler
- * @irq: IRQ number
- * @data: Pointer to the Xilinx VDMA channel structure
- *
- * Return: IRQ_HANDLED/IRQ_NONE
- */
-static irqreturn_t xilinx_vdma_irq_handler(int irq, void *data)
-{
- struct xilinx_vdma_chan *chan = data;
- u32 status;
-
- /* Read the status and ack the interrupts. */
- status = vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR);
- if (!(status & XILINX_VDMA_DMAXR_ALL_IRQ_MASK))
- return IRQ_NONE;
-
- vdma_ctrl_write(chan, XILINX_VDMA_REG_DMASR,
- status & XILINX_VDMA_DMAXR_ALL_IRQ_MASK);
-
- if (status & XILINX_VDMA_DMASR_ERR_IRQ) {
- /*
- * An error occurred. If C_FLUSH_ON_FSYNC is enabled and the
- * error is recoverable, ignore it. Otherwise flag the error.
- *
- * Only recoverable errors can be cleared in the DMASR register,
- * make sure not to write to other error bits to 1.
- */
- u32 errors = status & XILINX_VDMA_DMASR_ALL_ERR_MASK;
- vdma_ctrl_write(chan, XILINX_VDMA_REG_DMASR,
- errors & XILINX_VDMA_DMASR_ERR_RECOVER_MASK);
-
- if (!chan->flush_on_fsync ||
- (errors & ~XILINX_VDMA_DMASR_ERR_RECOVER_MASK)) {
- dev_err(chan->dev,
- "Channel %p has errors %x, cdr %x tdr %x\n",
- chan, errors,
- vdma_ctrl_read(chan, XILINX_VDMA_REG_CURDESC),
- vdma_ctrl_read(chan, XILINX_VDMA_REG_TAILDESC));
- chan->err = true;
- }
- }
-
- if (status & XILINX_VDMA_DMASR_DLY_CNT_IRQ) {
- /*
- * Device takes too long to do the transfer when user requires
- * responsiveness.
- */
- dev_dbg(chan->dev, "Inter-packet latency too long\n");
- }
-
- if (status & XILINX_VDMA_DMASR_FRM_CNT_IRQ) {
- spin_lock(&chan->lock);
- xilinx_vdma_complete_descriptor(chan);
- xilinx_vdma_start_transfer(chan);
- spin_unlock(&chan->lock);
- }
-
- tasklet_schedule(&chan->tasklet);
- return IRQ_HANDLED;
-}
-
-/**
- * append_desc_queue - Queuing descriptor
- * @chan: Driver specific dma channel
- * @desc: dma transaction descriptor
- */
-static void append_desc_queue(struct xilinx_vdma_chan *chan,
- struct xilinx_vdma_tx_descriptor *desc)
-{
- struct xilinx_vdma_tx_segment *tail_segment;
- struct xilinx_vdma_tx_descriptor *tail_desc;
-
- if (list_empty(&chan->pending_list))
- goto append;
-
- /*
- * Add the hardware descriptor to the chain of hardware descriptors
- * that already exists in memory.
- */
- tail_desc = list_last_entry(&chan->pending_list,
- struct xilinx_vdma_tx_descriptor, node);
- tail_segment = list_last_entry(&tail_desc->segments,
- struct xilinx_vdma_tx_segment, node);
- tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
-
- /*
- * Add the software descriptor and all children to the list
- * of pending transactions
- */
-append:
- list_add_tail(&desc->node, &chan->pending_list);
- chan->desc_pendingcount++;
-
- if (unlikely(chan->desc_pendingcount > chan->num_frms)) {
- dev_dbg(chan->dev, "desc pendingcount is too high\n");
- chan->desc_pendingcount = chan->num_frms;
- }
-}
-
-/**
- * xilinx_vdma_tx_submit - Submit DMA transaction
- * @tx: Async transaction descriptor
- *
- * Return: cookie value on success and failure value on error
- */
-static dma_cookie_t xilinx_vdma_tx_submit(struct dma_async_tx_descriptor *tx)
-{
- struct xilinx_vdma_tx_descriptor *desc = to_vdma_tx_descriptor(tx);
- struct xilinx_vdma_chan *chan = to_xilinx_chan(tx->chan);
- dma_cookie_t cookie;
- unsigned long flags;
- int err;
-
- if (chan->err) {
- /*
- * If reset fails, need to hard reset the system.
- * Channel is no longer functional
- */
- err = xilinx_vdma_chan_reset(chan);
- if (err < 0)
- return err;
- }
-
- spin_lock_irqsave(&chan->lock, flags);
-
- cookie = dma_cookie_assign(tx);
-
- /* Put this transaction onto the tail of the pending queue */
- append_desc_queue(chan, desc);
-
- spin_unlock_irqrestore(&chan->lock, flags);
-
- return cookie;
-}
-
-/**
- * xilinx_vdma_dma_prep_interleaved - prepare a descriptor for a
- * DMA_SLAVE transaction
- * @dchan: DMA channel
- * @xt: Interleaved template pointer
- * @flags: transfer ack flags
- *
- * Return: Async transaction descriptor on success and NULL on failure
- */
-static struct dma_async_tx_descriptor *
-xilinx_vdma_dma_prep_interleaved(struct dma_chan *dchan,
- struct dma_interleaved_template *xt,
- unsigned long flags)
-{
- struct xilinx_vdma_chan *chan = to_xilinx_chan(dchan);
- struct xilinx_vdma_tx_descriptor *desc;
- struct xilinx_vdma_tx_segment *segment, *prev = NULL;
- struct xilinx_vdma_desc_hw *hw;
-
- if (!is_slave_direction(xt->dir))
- return NULL;
-
- if (!xt->numf || !xt->sgl[0].size)
- return NULL;
-
- if (xt->frame_size != 1)
- return NULL;
-
- /* Allocate a transaction descriptor. */
- desc = xilinx_vdma_alloc_tx_descriptor(chan);
- if (!desc)
- return NULL;
-
- dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
- desc->async_tx.tx_submit = xilinx_vdma_tx_submit;
- async_tx_ack(&desc->async_tx);
-
- /* Allocate the link descriptor from DMA pool */
- segment = xilinx_vdma_alloc_tx_segment(chan);
- if (!segment)
- goto error;
-
- /* Fill in the hardware descriptor */
- hw = &segment->hw;
- hw->vsize = xt->numf;
- hw->hsize = xt->sgl[0].size;
- hw->stride = (xt->sgl[0].icg + xt->sgl[0].size) <<
- XILINX_VDMA_FRMDLY_STRIDE_STRIDE_SHIFT;
- hw->stride |= chan->config.frm_dly <<
- XILINX_VDMA_FRMDLY_STRIDE_FRMDLY_SHIFT;
-
- if (xt->dir != DMA_MEM_TO_DEV)
- hw->buf_addr = xt->dst_start;
- else
- hw->buf_addr = xt->src_start;
-
- /* Insert the segment into the descriptor segments list. */
- list_add_tail(&segment->node, &desc->segments);
-
- prev = segment;
-
- /* Link the last hardware descriptor with the first. */
- segment = list_first_entry(&desc->segments,
- struct xilinx_vdma_tx_segment, node);
- desc->async_tx.phys = segment->phys;
-
- return &desc->async_tx;
-
-error:
- xilinx_vdma_free_tx_descriptor(chan, desc);
- return NULL;
-}
-
-/**
- * xilinx_vdma_terminate_all - Halt the channel and free descriptors
- * @chan: Driver specific VDMA Channel pointer
- */
-static int xilinx_vdma_terminate_all(struct dma_chan *dchan)
-{
- struct xilinx_vdma_chan *chan = to_xilinx_chan(dchan);
-
- /* Halt the DMA engine */
- xilinx_vdma_halt(chan);
-
- /* Remove and free all of the descriptors in the lists */
- xilinx_vdma_free_descriptors(chan);
-
- return 0;
-}
-
-/**
- * xilinx_vdma_channel_set_config - Configure VDMA channel
- * Run-time configuration for Axi VDMA, supports:
- * . halt the channel
- * . configure interrupt coalescing and inter-packet delay threshold
- * . start/stop parking
- * . enable genlock
- *
- * @dchan: DMA channel
- * @cfg: VDMA device configuration pointer
- *
- * Return: '0' on success and failure value on error
- */
-int xilinx_vdma_channel_set_config(struct dma_chan *dchan,
- struct xilinx_vdma_config *cfg)
-{
- struct xilinx_vdma_chan *chan = to_xilinx_chan(dchan);
- u32 dmacr;
-
- if (cfg->reset)
- return xilinx_vdma_chan_reset(chan);
-
- dmacr = vdma_ctrl_read(chan, XILINX_VDMA_REG_DMACR);
-
- chan->config.frm_dly = cfg->frm_dly;
- chan->config.park = cfg->park;
-
- /* genlock settings */
- chan->config.gen_lock = cfg->gen_lock;
- chan->config.master = cfg->master;
-
- if (cfg->gen_lock && chan->genlock) {
- dmacr |= XILINX_VDMA_DMACR_GENLOCK_EN;
- dmacr |= cfg->master << XILINX_VDMA_DMACR_MASTER_SHIFT;
- }
-
- chan->config.frm_cnt_en = cfg->frm_cnt_en;
- if (cfg->park)
- chan->config.park_frm = cfg->park_frm;
- else
- chan->config.park_frm = -1;
-
- chan->config.coalesc = cfg->coalesc;
- chan->config.delay = cfg->delay;
-
- if (cfg->coalesc <= XILINX_VDMA_DMACR_FRAME_COUNT_MAX) {
- dmacr |= cfg->coalesc << XILINX_VDMA_DMACR_FRAME_COUNT_SHIFT;
- chan->config.coalesc = cfg->coalesc;
- }
-
- if (cfg->delay <= XILINX_VDMA_DMACR_DELAY_MAX) {
- dmacr |= cfg->delay << XILINX_VDMA_DMACR_DELAY_SHIFT;
- chan->config.delay = cfg->delay;
- }
-
- /* FSync Source selection */
- dmacr &= ~XILINX_VDMA_DMACR_FSYNCSRC_MASK;
- dmacr |= cfg->ext_fsync << XILINX_VDMA_DMACR_FSYNCSRC_SHIFT;
-
- vdma_ctrl_write(chan, XILINX_VDMA_REG_DMACR, dmacr);
-
- return 0;
-}
-EXPORT_SYMBOL(xilinx_vdma_channel_set_config);
-
-/* -----------------------------------------------------------------------------
- * Probe and remove
- */
-
-/**
- * xilinx_vdma_chan_remove - Per Channel remove function
- * @chan: Driver specific VDMA channel
- */
-static void xilinx_vdma_chan_remove(struct xilinx_vdma_chan *chan)
-{
- /* Disable all interrupts */
- vdma_ctrl_clr(chan, XILINX_VDMA_REG_DMACR,
- XILINX_VDMA_DMAXR_ALL_IRQ_MASK);
-
- if (chan->irq > 0)
- free_irq(chan->irq, chan);
-
- tasklet_kill(&chan->tasklet);
-
- list_del(&chan->common.device_node);
-}
-
-/**
- * xilinx_vdma_chan_probe - Per Channel Probing
- * It get channel features from the device tree entry and
- * initialize special channel handling routines
- *
- * @xdev: Driver specific device structure
- * @node: Device node
- *
- * Return: '0' on success and failure value on error
- */
-static int xilinx_vdma_chan_probe(struct xilinx_vdma_device *xdev,
- struct device_node *node)
-{
- struct xilinx_vdma_chan *chan;
- bool has_dre = false;
- u32 value, width;
- int err;
-
- /* Allocate and initialize the channel structure */
- chan = devm_kzalloc(xdev->dev, sizeof(*chan), GFP_KERNEL);
- if (!chan)
- return -ENOMEM;
-
- chan->dev = xdev->dev;
- chan->xdev = xdev;
- chan->has_sg = xdev->has_sg;
- chan->desc_pendingcount = 0x0;
-
- spin_lock_init(&chan->lock);
- INIT_LIST_HEAD(&chan->pending_list);
- INIT_LIST_HEAD(&chan->done_list);
- INIT_LIST_HEAD(&chan->active_list);
-
- /* Retrieve the channel properties from the device tree */
- has_dre = of_property_read_bool(node, "xlnx,include-dre");
-
- chan->genlock = of_property_read_bool(node, "xlnx,genlock-mode");
-
- err = of_property_read_u32(node, "xlnx,datawidth", &value);
- if (err) {
- dev_err(xdev->dev, "missing xlnx,datawidth property\n");
- return err;
- }
- width = value >> 3; /* Convert bits to bytes */
-
- /* If data width is greater than 8 bytes, DRE is not in hw */
- if (width > 8)
- has_dre = false;
-
- if (!has_dre)
- xdev->common.copy_align = fls(width - 1);
-
- if (of_device_is_compatible(node, "xlnx,axi-vdma-mm2s-channel")) {
- chan->direction = DMA_MEM_TO_DEV;
- chan->id = 0;
-
- chan->ctrl_offset = XILINX_VDMA_MM2S_CTRL_OFFSET;
- chan->desc_offset = XILINX_VDMA_MM2S_DESC_OFFSET;
-
- if (xdev->flush_on_fsync == XILINX_VDMA_FLUSH_BOTH ||
- xdev->flush_on_fsync == XILINX_VDMA_FLUSH_MM2S)
- chan->flush_on_fsync = true;
- } else if (of_device_is_compatible(node,
- "xlnx,axi-vdma-s2mm-channel")) {
- chan->direction = DMA_DEV_TO_MEM;
- chan->id = 1;
-
- chan->ctrl_offset = XILINX_VDMA_S2MM_CTRL_OFFSET;
- chan->desc_offset = XILINX_VDMA_S2MM_DESC_OFFSET;
-
- if (xdev->flush_on_fsync == XILINX_VDMA_FLUSH_BOTH ||
- xdev->flush_on_fsync == XILINX_VDMA_FLUSH_S2MM)
- chan->flush_on_fsync = true;
- } else {
- dev_err(xdev->dev, "Invalid channel compatible node\n");
- return -EINVAL;
- }
-
- /* Request the interrupt */
- chan->irq = irq_of_parse_and_map(node, 0);
- err = request_irq(chan->irq, xilinx_vdma_irq_handler, IRQF_SHARED,
- "xilinx-vdma-controller", chan);
- if (err) {
- dev_err(xdev->dev, "unable to request IRQ %d\n", chan->irq);
- return err;
- }
-
- /* Initialize the tasklet */
- tasklet_init(&chan->tasklet, xilinx_vdma_do_tasklet,
- (unsigned long)chan);
-
- /*
- * Initialize the DMA channel and add it to the DMA engine channels
- * list.
- */
- chan->common.device = &xdev->common;
-
- list_add_tail(&chan->common.device_node, &xdev->common.channels);
- xdev->chan[chan->id] = chan;
-
- /* Reset the channel */
- err = xilinx_vdma_chan_reset(chan);
- if (err < 0) {
- dev_err(xdev->dev, "Reset channel failed\n");
- return err;
- }
-
- return 0;
-}
-
-/**
- * of_dma_xilinx_xlate - Translation function
- * @dma_spec: Pointer to DMA specifier as found in the device tree
- * @ofdma: Pointer to DMA controller data
- *
- * Return: DMA channel pointer on success and NULL on error
- */
-static struct dma_chan *of_dma_xilinx_xlate(struct of_phandle_args *dma_spec,
- struct of_dma *ofdma)
-{
- struct xilinx_vdma_device *xdev = ofdma->of_dma_data;
- int chan_id = dma_spec->args[0];
-
- if (chan_id >= XILINX_VDMA_MAX_CHANS_PER_DEVICE || !xdev->chan[chan_id])
- return NULL;
-
- return dma_get_slave_channel(&xdev->chan[chan_id]->common);
-}
-
-/**
- * xilinx_vdma_probe - Driver probe function
- * @pdev: Pointer to the platform_device structure
- *
- * Return: '0' on success and failure value on error
- */
-static int xilinx_vdma_probe(struct platform_device *pdev)
-{
- struct device_node *node = pdev->dev.of_node;
- struct xilinx_vdma_device *xdev;
- struct device_node *child;
- struct resource *io;
- u32 num_frames;
- int i, err;
-
- /* Allocate and initialize the DMA engine structure */
- xdev = devm_kzalloc(&pdev->dev, sizeof(*xdev), GFP_KERNEL);
- if (!xdev)
- return -ENOMEM;
-
- xdev->dev = &pdev->dev;
-
- /* Request and map I/O memory */
- io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- xdev->regs = devm_ioremap_resource(&pdev->dev, io);
- if (IS_ERR(xdev->regs))
- return PTR_ERR(xdev->regs);
-
- /* Retrieve the DMA engine properties from the device tree */
- xdev->has_sg = of_property_read_bool(node, "xlnx,include-sg");
-
- err = of_property_read_u32(node, "xlnx,num-fstores", &num_frames);
- if (err < 0) {
- dev_err(xdev->dev, "missing xlnx,num-fstores property\n");
- return err;
- }
-
- err = of_property_read_u32(node, "xlnx,flush-fsync",
- &xdev->flush_on_fsync);
- if (err < 0)
- dev_warn(xdev->dev, "missing xlnx,flush-fsync property\n");
-
- /* Initialize the DMA engine */
- xdev->common.dev = &pdev->dev;
-
- INIT_LIST_HEAD(&xdev->common.channels);
- dma_cap_set(DMA_SLAVE, xdev->common.cap_mask);
- dma_cap_set(DMA_PRIVATE, xdev->common.cap_mask);
-
- xdev->common.device_alloc_chan_resources =
- xilinx_vdma_alloc_chan_resources;
- xdev->common.device_free_chan_resources =
- xilinx_vdma_free_chan_resources;
- xdev->common.device_prep_interleaved_dma =
- xilinx_vdma_dma_prep_interleaved;
- xdev->common.device_terminate_all = xilinx_vdma_terminate_all;
- xdev->common.device_tx_status = xilinx_vdma_tx_status;
- xdev->common.device_issue_pending = xilinx_vdma_issue_pending;
-
- platform_set_drvdata(pdev, xdev);
-
- /* Initialize the channels */
- for_each_child_of_node(node, child) {
- err = xilinx_vdma_chan_probe(xdev, child);
- if (err < 0)
- goto error;
- }
-
- for (i = 0; i < XILINX_VDMA_MAX_CHANS_PER_DEVICE; i++)
- if (xdev->chan[i])
- xdev->chan[i]->num_frms = num_frames;
-
- /* Register the DMA engine with the core */
- dma_async_device_register(&xdev->common);
-
- err = of_dma_controller_register(node, of_dma_xilinx_xlate,
- xdev);
- if (err < 0) {
- dev_err(&pdev->dev, "Unable to register DMA to DT\n");
- dma_async_device_unregister(&xdev->common);
- goto error;
- }
-
- dev_info(&pdev->dev, "Xilinx AXI VDMA Engine Driver Probed!!\n");
-
- return 0;
-
-error:
- for (i = 0; i < XILINX_VDMA_MAX_CHANS_PER_DEVICE; i++)
- if (xdev->chan[i])
- xilinx_vdma_chan_remove(xdev->chan[i]);
-
- return err;
-}
-
-/**
- * xilinx_vdma_remove - Driver remove function
- * @pdev: Pointer to the platform_device structure
- *
- * Return: Always '0'
- */
-static int xilinx_vdma_remove(struct platform_device *pdev)
-{
- struct xilinx_vdma_device *xdev = platform_get_drvdata(pdev);
- int i;
-
- of_dma_controller_free(pdev->dev.of_node);
-
- dma_async_device_unregister(&xdev->common);
-
- for (i = 0; i < XILINX_VDMA_MAX_CHANS_PER_DEVICE; i++)
- if (xdev->chan[i])
- xilinx_vdma_chan_remove(xdev->chan[i]);
-
- return 0;
-}
-
-static const struct of_device_id xilinx_vdma_of_ids[] = {
- { .compatible = "xlnx,axi-vdma-1.00.a",},
- {}
-};
-MODULE_DEVICE_TABLE(of, xilinx_vdma_of_ids);
-
-static struct platform_driver xilinx_vdma_driver = {
- .driver = {
- .name = "xilinx-vdma",
- .of_match_table = xilinx_vdma_of_ids,
- },
- .probe = xilinx_vdma_probe,
- .remove = xilinx_vdma_remove,
-};
-
-module_platform_driver(xilinx_vdma_driver);
-
-MODULE_AUTHOR("Xilinx, Inc.");
-MODULE_DESCRIPTION("Xilinx VDMA driver");
-MODULE_LICENSE("GPL v2");
projects / vajnamar / linux-xlnx.git / commitdiff