forked from Minki/linux
d264b48687
Commit 3b62286d0e
("dmaengine: Remove FSF mailing addresses") left Free
Software Foundation mailing address still in two files. Remove it now.
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
789 lines
20 KiB
C
789 lines
20 KiB
C
/*
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* timb_dma.c timberdale FPGA DMA driver
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* Copyright (c) 2010 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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/* Supports:
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* Timberdale FPGA DMA engine
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*/
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#include <linux/dmaengine.h>
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#include <linux/dma-mapping.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/timb_dma.h>
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#include "dmaengine.h"
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#define DRIVER_NAME "timb-dma"
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/* Global DMA registers */
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#define TIMBDMA_ACR 0x34
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#define TIMBDMA_32BIT_ADDR 0x01
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#define TIMBDMA_ISR 0x080000
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#define TIMBDMA_IPR 0x080004
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#define TIMBDMA_IER 0x080008
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/* Channel specific registers */
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/* RX instances base addresses are 0x00, 0x40, 0x80 ...
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* TX instances base addresses are 0x18, 0x58, 0x98 ...
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*/
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#define TIMBDMA_INSTANCE_OFFSET 0x40
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#define TIMBDMA_INSTANCE_TX_OFFSET 0x18
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/* RX registers, relative the instance base */
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#define TIMBDMA_OFFS_RX_DHAR 0x00
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#define TIMBDMA_OFFS_RX_DLAR 0x04
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#define TIMBDMA_OFFS_RX_LR 0x0C
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#define TIMBDMA_OFFS_RX_BLR 0x10
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#define TIMBDMA_OFFS_RX_ER 0x14
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#define TIMBDMA_RX_EN 0x01
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/* bytes per Row, video specific register
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* which is placed after the TX registers...
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*/
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#define TIMBDMA_OFFS_RX_BPRR 0x30
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/* TX registers, relative the instance base */
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#define TIMBDMA_OFFS_TX_DHAR 0x00
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#define TIMBDMA_OFFS_TX_DLAR 0x04
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#define TIMBDMA_OFFS_TX_BLR 0x0C
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#define TIMBDMA_OFFS_TX_LR 0x14
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#define TIMB_DMA_DESC_SIZE 8
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struct timb_dma_desc {
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struct list_head desc_node;
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struct dma_async_tx_descriptor txd;
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u8 *desc_list;
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unsigned int desc_list_len;
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bool interrupt;
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};
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struct timb_dma_chan {
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struct dma_chan chan;
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void __iomem *membase;
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spinlock_t lock; /* Used to protect data structures,
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especially the lists and descriptors,
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from races between the tasklet and calls
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from above */
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bool ongoing;
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struct list_head active_list;
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struct list_head queue;
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struct list_head free_list;
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unsigned int bytes_per_line;
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enum dma_transfer_direction direction;
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unsigned int descs; /* Descriptors to allocate */
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unsigned int desc_elems; /* number of elems per descriptor */
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};
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struct timb_dma {
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struct dma_device dma;
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void __iomem *membase;
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struct tasklet_struct tasklet;
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struct timb_dma_chan channels[0];
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};
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static struct device *chan2dev(struct dma_chan *chan)
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{
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return &chan->dev->device;
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}
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static struct device *chan2dmadev(struct dma_chan *chan)
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{
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return chan2dev(chan)->parent->parent;
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}
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static struct timb_dma *tdchantotd(struct timb_dma_chan *td_chan)
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{
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int id = td_chan->chan.chan_id;
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return (struct timb_dma *)((u8 *)td_chan -
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id * sizeof(struct timb_dma_chan) - sizeof(struct timb_dma));
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}
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/* Must be called with the spinlock held */
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static void __td_enable_chan_irq(struct timb_dma_chan *td_chan)
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{
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int id = td_chan->chan.chan_id;
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struct timb_dma *td = tdchantotd(td_chan);
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u32 ier;
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/* enable interrupt for this channel */
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ier = ioread32(td->membase + TIMBDMA_IER);
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ier |= 1 << id;
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dev_dbg(chan2dev(&td_chan->chan), "Enabling irq: %d, IER: 0x%x\n", id,
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ier);
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iowrite32(ier, td->membase + TIMBDMA_IER);
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}
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/* Should be called with the spinlock held */
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static bool __td_dma_done_ack(struct timb_dma_chan *td_chan)
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{
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int id = td_chan->chan.chan_id;
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struct timb_dma *td = (struct timb_dma *)((u8 *)td_chan -
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id * sizeof(struct timb_dma_chan) - sizeof(struct timb_dma));
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u32 isr;
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bool done = false;
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dev_dbg(chan2dev(&td_chan->chan), "Checking irq: %d, td: %p\n", id, td);
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isr = ioread32(td->membase + TIMBDMA_ISR) & (1 << id);
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if (isr) {
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iowrite32(isr, td->membase + TIMBDMA_ISR);
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done = true;
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}
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return done;
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}
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static int td_fill_desc(struct timb_dma_chan *td_chan, u8 *dma_desc,
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struct scatterlist *sg, bool last)
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{
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if (sg_dma_len(sg) > USHRT_MAX) {
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dev_err(chan2dev(&td_chan->chan), "Too big sg element\n");
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return -EINVAL;
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}
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/* length must be word aligned */
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if (sg_dma_len(sg) % sizeof(u32)) {
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dev_err(chan2dev(&td_chan->chan), "Incorrect length: %d\n",
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sg_dma_len(sg));
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return -EINVAL;
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}
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dev_dbg(chan2dev(&td_chan->chan), "desc: %p, addr: 0x%llx\n",
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dma_desc, (unsigned long long)sg_dma_address(sg));
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dma_desc[7] = (sg_dma_address(sg) >> 24) & 0xff;
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dma_desc[6] = (sg_dma_address(sg) >> 16) & 0xff;
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dma_desc[5] = (sg_dma_address(sg) >> 8) & 0xff;
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dma_desc[4] = (sg_dma_address(sg) >> 0) & 0xff;
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dma_desc[3] = (sg_dma_len(sg) >> 8) & 0xff;
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dma_desc[2] = (sg_dma_len(sg) >> 0) & 0xff;
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dma_desc[1] = 0x00;
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dma_desc[0] = 0x21 | (last ? 0x02 : 0); /* tran, valid */
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return 0;
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}
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/* Must be called with the spinlock held */
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static void __td_start_dma(struct timb_dma_chan *td_chan)
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{
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struct timb_dma_desc *td_desc;
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if (td_chan->ongoing) {
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dev_err(chan2dev(&td_chan->chan),
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"Transfer already ongoing\n");
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return;
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}
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td_desc = list_entry(td_chan->active_list.next, struct timb_dma_desc,
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desc_node);
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dev_dbg(chan2dev(&td_chan->chan),
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"td_chan: %p, chan: %d, membase: %p\n",
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td_chan, td_chan->chan.chan_id, td_chan->membase);
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if (td_chan->direction == DMA_DEV_TO_MEM) {
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/* descriptor address */
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iowrite32(0, td_chan->membase + TIMBDMA_OFFS_RX_DHAR);
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iowrite32(td_desc->txd.phys, td_chan->membase +
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TIMBDMA_OFFS_RX_DLAR);
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/* Bytes per line */
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iowrite32(td_chan->bytes_per_line, td_chan->membase +
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TIMBDMA_OFFS_RX_BPRR);
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/* enable RX */
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iowrite32(TIMBDMA_RX_EN, td_chan->membase + TIMBDMA_OFFS_RX_ER);
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} else {
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/* address high */
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iowrite32(0, td_chan->membase + TIMBDMA_OFFS_TX_DHAR);
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iowrite32(td_desc->txd.phys, td_chan->membase +
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TIMBDMA_OFFS_TX_DLAR);
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}
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td_chan->ongoing = true;
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if (td_desc->interrupt)
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__td_enable_chan_irq(td_chan);
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}
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static void __td_finish(struct timb_dma_chan *td_chan)
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{
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dma_async_tx_callback callback;
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void *param;
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struct dma_async_tx_descriptor *txd;
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struct timb_dma_desc *td_desc;
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/* can happen if the descriptor is canceled */
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if (list_empty(&td_chan->active_list))
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return;
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td_desc = list_entry(td_chan->active_list.next, struct timb_dma_desc,
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desc_node);
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txd = &td_desc->txd;
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dev_dbg(chan2dev(&td_chan->chan), "descriptor %u complete\n",
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txd->cookie);
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/* make sure to stop the transfer */
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if (td_chan->direction == DMA_DEV_TO_MEM)
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iowrite32(0, td_chan->membase + TIMBDMA_OFFS_RX_ER);
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/* Currently no support for stopping DMA transfers
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else
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iowrite32(0, td_chan->membase + TIMBDMA_OFFS_TX_DLAR);
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*/
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dma_cookie_complete(txd);
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td_chan->ongoing = false;
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callback = txd->callback;
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param = txd->callback_param;
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list_move(&td_desc->desc_node, &td_chan->free_list);
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dma_descriptor_unmap(txd);
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/*
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* The API requires that no submissions are done from a
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* callback, so we don't need to drop the lock here
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*/
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if (callback)
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callback(param);
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}
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static u32 __td_ier_mask(struct timb_dma *td)
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{
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int i;
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u32 ret = 0;
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for (i = 0; i < td->dma.chancnt; i++) {
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struct timb_dma_chan *td_chan = td->channels + i;
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if (td_chan->ongoing) {
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struct timb_dma_desc *td_desc =
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list_entry(td_chan->active_list.next,
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struct timb_dma_desc, desc_node);
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if (td_desc->interrupt)
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ret |= 1 << i;
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}
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}
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return ret;
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}
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static void __td_start_next(struct timb_dma_chan *td_chan)
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{
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struct timb_dma_desc *td_desc;
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BUG_ON(list_empty(&td_chan->queue));
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BUG_ON(td_chan->ongoing);
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td_desc = list_entry(td_chan->queue.next, struct timb_dma_desc,
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desc_node);
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dev_dbg(chan2dev(&td_chan->chan), "%s: started %u\n",
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__func__, td_desc->txd.cookie);
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list_move(&td_desc->desc_node, &td_chan->active_list);
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__td_start_dma(td_chan);
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}
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static dma_cookie_t td_tx_submit(struct dma_async_tx_descriptor *txd)
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{
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struct timb_dma_desc *td_desc = container_of(txd, struct timb_dma_desc,
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txd);
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struct timb_dma_chan *td_chan = container_of(txd->chan,
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struct timb_dma_chan, chan);
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dma_cookie_t cookie;
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spin_lock_bh(&td_chan->lock);
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cookie = dma_cookie_assign(txd);
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if (list_empty(&td_chan->active_list)) {
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dev_dbg(chan2dev(txd->chan), "%s: started %u\n", __func__,
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txd->cookie);
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list_add_tail(&td_desc->desc_node, &td_chan->active_list);
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__td_start_dma(td_chan);
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} else {
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dev_dbg(chan2dev(txd->chan), "tx_submit: queued %u\n",
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txd->cookie);
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list_add_tail(&td_desc->desc_node, &td_chan->queue);
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}
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spin_unlock_bh(&td_chan->lock);
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return cookie;
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}
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static struct timb_dma_desc *td_alloc_init_desc(struct timb_dma_chan *td_chan)
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{
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struct dma_chan *chan = &td_chan->chan;
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struct timb_dma_desc *td_desc;
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int err;
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td_desc = kzalloc(sizeof(struct timb_dma_desc), GFP_KERNEL);
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if (!td_desc) {
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dev_err(chan2dev(chan), "Failed to alloc descriptor\n");
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goto out;
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}
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td_desc->desc_list_len = td_chan->desc_elems * TIMB_DMA_DESC_SIZE;
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td_desc->desc_list = kzalloc(td_desc->desc_list_len, GFP_KERNEL);
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if (!td_desc->desc_list) {
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dev_err(chan2dev(chan), "Failed to alloc descriptor\n");
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goto err;
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}
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dma_async_tx_descriptor_init(&td_desc->txd, chan);
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td_desc->txd.tx_submit = td_tx_submit;
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td_desc->txd.flags = DMA_CTRL_ACK;
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td_desc->txd.phys = dma_map_single(chan2dmadev(chan),
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td_desc->desc_list, td_desc->desc_list_len, DMA_TO_DEVICE);
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err = dma_mapping_error(chan2dmadev(chan), td_desc->txd.phys);
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if (err) {
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dev_err(chan2dev(chan), "DMA mapping error: %d\n", err);
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goto err;
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}
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return td_desc;
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err:
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kfree(td_desc->desc_list);
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kfree(td_desc);
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out:
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return NULL;
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}
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static void td_free_desc(struct timb_dma_desc *td_desc)
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{
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dev_dbg(chan2dev(td_desc->txd.chan), "Freeing desc: %p\n", td_desc);
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dma_unmap_single(chan2dmadev(td_desc->txd.chan), td_desc->txd.phys,
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td_desc->desc_list_len, DMA_TO_DEVICE);
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kfree(td_desc->desc_list);
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kfree(td_desc);
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}
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static void td_desc_put(struct timb_dma_chan *td_chan,
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struct timb_dma_desc *td_desc)
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{
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dev_dbg(chan2dev(&td_chan->chan), "Putting desc: %p\n", td_desc);
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spin_lock_bh(&td_chan->lock);
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list_add(&td_desc->desc_node, &td_chan->free_list);
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spin_unlock_bh(&td_chan->lock);
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}
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static struct timb_dma_desc *td_desc_get(struct timb_dma_chan *td_chan)
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{
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struct timb_dma_desc *td_desc, *_td_desc;
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struct timb_dma_desc *ret = NULL;
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spin_lock_bh(&td_chan->lock);
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list_for_each_entry_safe(td_desc, _td_desc, &td_chan->free_list,
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desc_node) {
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if (async_tx_test_ack(&td_desc->txd)) {
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list_del(&td_desc->desc_node);
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ret = td_desc;
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break;
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}
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dev_dbg(chan2dev(&td_chan->chan), "desc %p not ACKed\n",
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td_desc);
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}
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spin_unlock_bh(&td_chan->lock);
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return ret;
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}
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static int td_alloc_chan_resources(struct dma_chan *chan)
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{
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struct timb_dma_chan *td_chan =
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container_of(chan, struct timb_dma_chan, chan);
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int i;
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dev_dbg(chan2dev(chan), "%s: entry\n", __func__);
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BUG_ON(!list_empty(&td_chan->free_list));
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for (i = 0; i < td_chan->descs; i++) {
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struct timb_dma_desc *td_desc = td_alloc_init_desc(td_chan);
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if (!td_desc) {
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if (i)
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break;
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else {
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dev_err(chan2dev(chan),
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"Couldnt allocate any descriptors\n");
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return -ENOMEM;
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}
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}
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td_desc_put(td_chan, td_desc);
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}
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spin_lock_bh(&td_chan->lock);
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dma_cookie_init(chan);
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spin_unlock_bh(&td_chan->lock);
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return 0;
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}
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static void td_free_chan_resources(struct dma_chan *chan)
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{
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struct timb_dma_chan *td_chan =
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container_of(chan, struct timb_dma_chan, chan);
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struct timb_dma_desc *td_desc, *_td_desc;
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LIST_HEAD(list);
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dev_dbg(chan2dev(chan), "%s: Entry\n", __func__);
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|
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/* check that all descriptors are free */
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BUG_ON(!list_empty(&td_chan->active_list));
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BUG_ON(!list_empty(&td_chan->queue));
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spin_lock_bh(&td_chan->lock);
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list_splice_init(&td_chan->free_list, &list);
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spin_unlock_bh(&td_chan->lock);
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list_for_each_entry_safe(td_desc, _td_desc, &list, desc_node) {
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dev_dbg(chan2dev(chan), "%s: Freeing desc: %p\n", __func__,
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td_desc);
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td_free_desc(td_desc);
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}
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}
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|
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static enum dma_status td_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
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struct dma_tx_state *txstate)
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{
|
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enum dma_status ret;
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|
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dev_dbg(chan2dev(chan), "%s: Entry\n", __func__);
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ret = dma_cookie_status(chan, cookie, txstate);
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dev_dbg(chan2dev(chan), "%s: exit, ret: %d\n", __func__, ret);
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return ret;
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}
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|
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static void td_issue_pending(struct dma_chan *chan)
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{
|
|
struct timb_dma_chan *td_chan =
|
|
container_of(chan, struct timb_dma_chan, chan);
|
|
|
|
dev_dbg(chan2dev(chan), "%s: Entry\n", __func__);
|
|
spin_lock_bh(&td_chan->lock);
|
|
|
|
if (!list_empty(&td_chan->active_list))
|
|
/* transfer ongoing */
|
|
if (__td_dma_done_ack(td_chan))
|
|
__td_finish(td_chan);
|
|
|
|
if (list_empty(&td_chan->active_list) && !list_empty(&td_chan->queue))
|
|
__td_start_next(td_chan);
|
|
|
|
spin_unlock_bh(&td_chan->lock);
|
|
}
|
|
|
|
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)
|
|
{
|
|
struct timb_dma_chan *td_chan =
|
|
container_of(chan, struct timb_dma_chan, chan);
|
|
struct timb_dma_desc *td_desc;
|
|
struct scatterlist *sg;
|
|
unsigned int i;
|
|
unsigned int desc_usage = 0;
|
|
|
|
if (!sgl || !sg_len) {
|
|
dev_err(chan2dev(chan), "%s: No SG list\n", __func__);
|
|
return NULL;
|
|
}
|
|
|
|
/* even channels are for RX, odd for TX */
|
|
if (td_chan->direction != direction) {
|
|
dev_err(chan2dev(chan),
|
|
"Requesting channel in wrong direction\n");
|
|
return NULL;
|
|
}
|
|
|
|
td_desc = td_desc_get(td_chan);
|
|
if (!td_desc) {
|
|
dev_err(chan2dev(chan), "Not enough descriptors available\n");
|
|
return NULL;
|
|
}
|
|
|
|
td_desc->interrupt = (flags & DMA_PREP_INTERRUPT) != 0;
|
|
|
|
for_each_sg(sgl, sg, sg_len, i) {
|
|
int err;
|
|
if (desc_usage > td_desc->desc_list_len) {
|
|
dev_err(chan2dev(chan), "No descriptor space\n");
|
|
return NULL;
|
|
}
|
|
|
|
err = td_fill_desc(td_chan, td_desc->desc_list + desc_usage, sg,
|
|
i == (sg_len - 1));
|
|
if (err) {
|
|
dev_err(chan2dev(chan), "Failed to update desc: %d\n",
|
|
err);
|
|
td_desc_put(td_chan, td_desc);
|
|
return NULL;
|
|
}
|
|
desc_usage += TIMB_DMA_DESC_SIZE;
|
|
}
|
|
|
|
dma_sync_single_for_device(chan2dmadev(chan), td_desc->txd.phys,
|
|
td_desc->desc_list_len, DMA_MEM_TO_DEV);
|
|
|
|
return &td_desc->txd;
|
|
}
|
|
|
|
static int td_terminate_all(struct dma_chan *chan)
|
|
{
|
|
struct timb_dma_chan *td_chan =
|
|
container_of(chan, struct timb_dma_chan, chan);
|
|
struct timb_dma_desc *td_desc, *_td_desc;
|
|
|
|
dev_dbg(chan2dev(chan), "%s: Entry\n", __func__);
|
|
|
|
/* first the easy part, put the queue into the free list */
|
|
spin_lock_bh(&td_chan->lock);
|
|
list_for_each_entry_safe(td_desc, _td_desc, &td_chan->queue,
|
|
desc_node)
|
|
list_move(&td_desc->desc_node, &td_chan->free_list);
|
|
|
|
/* now tear down the running */
|
|
__td_finish(td_chan);
|
|
spin_unlock_bh(&td_chan->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void td_tasklet(unsigned long data)
|
|
{
|
|
struct timb_dma *td = (struct timb_dma *)data;
|
|
u32 isr;
|
|
u32 ipr;
|
|
u32 ier;
|
|
int i;
|
|
|
|
isr = ioread32(td->membase + TIMBDMA_ISR);
|
|
ipr = isr & __td_ier_mask(td);
|
|
|
|
/* ack the interrupts */
|
|
iowrite32(ipr, td->membase + TIMBDMA_ISR);
|
|
|
|
for (i = 0; i < td->dma.chancnt; i++)
|
|
if (ipr & (1 << i)) {
|
|
struct timb_dma_chan *td_chan = td->channels + i;
|
|
spin_lock(&td_chan->lock);
|
|
__td_finish(td_chan);
|
|
if (!list_empty(&td_chan->queue))
|
|
__td_start_next(td_chan);
|
|
spin_unlock(&td_chan->lock);
|
|
}
|
|
|
|
ier = __td_ier_mask(td);
|
|
iowrite32(ier, td->membase + TIMBDMA_IER);
|
|
}
|
|
|
|
|
|
static irqreturn_t td_irq(int irq, void *devid)
|
|
{
|
|
struct timb_dma *td = devid;
|
|
u32 ipr = ioread32(td->membase + TIMBDMA_IPR);
|
|
|
|
if (ipr) {
|
|
/* disable interrupts, will be re-enabled in tasklet */
|
|
iowrite32(0, td->membase + TIMBDMA_IER);
|
|
|
|
tasklet_schedule(&td->tasklet);
|
|
|
|
return IRQ_HANDLED;
|
|
} else
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
|
|
static int td_probe(struct platform_device *pdev)
|
|
{
|
|
struct timb_dma_platform_data *pdata = dev_get_platdata(&pdev->dev);
|
|
struct timb_dma *td;
|
|
struct resource *iomem;
|
|
int irq;
|
|
int err;
|
|
int i;
|
|
|
|
if (!pdata) {
|
|
dev_err(&pdev->dev, "No platform data\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!iomem)
|
|
return -EINVAL;
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0)
|
|
return irq;
|
|
|
|
if (!request_mem_region(iomem->start, resource_size(iomem),
|
|
DRIVER_NAME))
|
|
return -EBUSY;
|
|
|
|
td = kzalloc(sizeof(struct timb_dma) +
|
|
sizeof(struct timb_dma_chan) * pdata->nr_channels, GFP_KERNEL);
|
|
if (!td) {
|
|
err = -ENOMEM;
|
|
goto err_release_region;
|
|
}
|
|
|
|
dev_dbg(&pdev->dev, "Allocated TD: %p\n", td);
|
|
|
|
td->membase = ioremap(iomem->start, resource_size(iomem));
|
|
if (!td->membase) {
|
|
dev_err(&pdev->dev, "Failed to remap I/O memory\n");
|
|
err = -ENOMEM;
|
|
goto err_free_mem;
|
|
}
|
|
|
|
/* 32bit addressing */
|
|
iowrite32(TIMBDMA_32BIT_ADDR, td->membase + TIMBDMA_ACR);
|
|
|
|
/* disable and clear any interrupts */
|
|
iowrite32(0x0, td->membase + TIMBDMA_IER);
|
|
iowrite32(0xFFFFFFFF, td->membase + TIMBDMA_ISR);
|
|
|
|
tasklet_init(&td->tasklet, td_tasklet, (unsigned long)td);
|
|
|
|
err = request_irq(irq, td_irq, IRQF_SHARED, DRIVER_NAME, td);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "Failed to request IRQ\n");
|
|
goto err_tasklet_kill;
|
|
}
|
|
|
|
td->dma.device_alloc_chan_resources = td_alloc_chan_resources;
|
|
td->dma.device_free_chan_resources = td_free_chan_resources;
|
|
td->dma.device_tx_status = td_tx_status;
|
|
td->dma.device_issue_pending = td_issue_pending;
|
|
|
|
dma_cap_set(DMA_SLAVE, td->dma.cap_mask);
|
|
dma_cap_set(DMA_PRIVATE, td->dma.cap_mask);
|
|
td->dma.device_prep_slave_sg = td_prep_slave_sg;
|
|
td->dma.device_terminate_all = td_terminate_all;
|
|
|
|
td->dma.dev = &pdev->dev;
|
|
|
|
INIT_LIST_HEAD(&td->dma.channels);
|
|
|
|
for (i = 0; i < pdata->nr_channels; i++) {
|
|
struct timb_dma_chan *td_chan = &td->channels[i];
|
|
struct timb_dma_platform_data_channel *pchan =
|
|
pdata->channels + i;
|
|
|
|
/* even channels are RX, odd are TX */
|
|
if ((i % 2) == pchan->rx) {
|
|
dev_err(&pdev->dev, "Wrong channel configuration\n");
|
|
err = -EINVAL;
|
|
goto err_free_irq;
|
|
}
|
|
|
|
td_chan->chan.device = &td->dma;
|
|
dma_cookie_init(&td_chan->chan);
|
|
spin_lock_init(&td_chan->lock);
|
|
INIT_LIST_HEAD(&td_chan->active_list);
|
|
INIT_LIST_HEAD(&td_chan->queue);
|
|
INIT_LIST_HEAD(&td_chan->free_list);
|
|
|
|
td_chan->descs = pchan->descriptors;
|
|
td_chan->desc_elems = pchan->descriptor_elements;
|
|
td_chan->bytes_per_line = pchan->bytes_per_line;
|
|
td_chan->direction = pchan->rx ? DMA_DEV_TO_MEM :
|
|
DMA_MEM_TO_DEV;
|
|
|
|
td_chan->membase = td->membase +
|
|
(i / 2) * TIMBDMA_INSTANCE_OFFSET +
|
|
(pchan->rx ? 0 : TIMBDMA_INSTANCE_TX_OFFSET);
|
|
|
|
dev_dbg(&pdev->dev, "Chan: %d, membase: %p\n",
|
|
i, td_chan->membase);
|
|
|
|
list_add_tail(&td_chan->chan.device_node, &td->dma.channels);
|
|
}
|
|
|
|
err = dma_async_device_register(&td->dma);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "Failed to register async device\n");
|
|
goto err_free_irq;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, td);
|
|
|
|
dev_dbg(&pdev->dev, "Probe result: %d\n", err);
|
|
return err;
|
|
|
|
err_free_irq:
|
|
free_irq(irq, td);
|
|
err_tasklet_kill:
|
|
tasklet_kill(&td->tasklet);
|
|
iounmap(td->membase);
|
|
err_free_mem:
|
|
kfree(td);
|
|
err_release_region:
|
|
release_mem_region(iomem->start, resource_size(iomem));
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
static int td_remove(struct platform_device *pdev)
|
|
{
|
|
struct timb_dma *td = platform_get_drvdata(pdev);
|
|
struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
int irq = platform_get_irq(pdev, 0);
|
|
|
|
dma_async_device_unregister(&td->dma);
|
|
free_irq(irq, td);
|
|
tasklet_kill(&td->tasklet);
|
|
iounmap(td->membase);
|
|
kfree(td);
|
|
release_mem_region(iomem->start, resource_size(iomem));
|
|
|
|
dev_dbg(&pdev->dev, "Removed...\n");
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver td_driver = {
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
},
|
|
.probe = td_probe,
|
|
.remove = td_remove,
|
|
};
|
|
|
|
module_platform_driver(td_driver);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("Timberdale DMA controller driver");
|
|
MODULE_AUTHOR("Pelagicore AB <info@pelagicore.com>");
|
|
MODULE_ALIAS("platform:"DRIVER_NAME);
|