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![Maxime Ripard](/assets/img/avatar_default.png)
Rename the device_control callback of the TXX9 DMA driver to terminate_all since it's all it's really doing. That will eventually be used to retrieve slave capabilities. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
907 lines
24 KiB
C
907 lines
24 KiB
C
/*
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* DMA Engine support for Tsi721 PCIExpress-to-SRIO bridge
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*
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* Copyright (c) 2011-2014 Integrated Device Technology, Inc.
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* Alexandre Bounine <alexandre.bounine@idt.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* The full GNU General Public License is included in this distribution in the
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* file called COPYING.
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*/
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#include <linux/io.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/rio.h>
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#include <linux/rio_drv.h>
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#include <linux/dma-mapping.h>
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#include <linux/interrupt.h>
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#include <linux/kfifo.h>
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#include <linux/delay.h>
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#include "../../dma/dmaengine.h"
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#include "tsi721.h"
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#define TSI721_DMA_TX_QUEUE_SZ 16 /* number of transaction descriptors */
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#ifdef CONFIG_PCI_MSI
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static irqreturn_t tsi721_bdma_msix(int irq, void *ptr);
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#endif
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static int tsi721_submit_sg(struct tsi721_tx_desc *desc);
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static unsigned int dma_desc_per_channel = 128;
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module_param(dma_desc_per_channel, uint, S_IWUSR | S_IRUGO);
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MODULE_PARM_DESC(dma_desc_per_channel,
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"Number of DMA descriptors per channel (default: 128)");
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static inline struct tsi721_bdma_chan *to_tsi721_chan(struct dma_chan *chan)
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{
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return container_of(chan, struct tsi721_bdma_chan, dchan);
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}
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static inline struct tsi721_device *to_tsi721(struct dma_device *ddev)
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{
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return container_of(ddev, struct rio_mport, dma)->priv;
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}
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static inline
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struct tsi721_tx_desc *to_tsi721_desc(struct dma_async_tx_descriptor *txd)
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{
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return container_of(txd, struct tsi721_tx_desc, txd);
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}
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static inline
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struct tsi721_tx_desc *tsi721_dma_first_active(
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struct tsi721_bdma_chan *bdma_chan)
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{
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return list_first_entry(&bdma_chan->active_list,
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struct tsi721_tx_desc, desc_node);
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}
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static int tsi721_bdma_ch_init(struct tsi721_bdma_chan *bdma_chan, int bd_num)
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{
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struct tsi721_dma_desc *bd_ptr;
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struct device *dev = bdma_chan->dchan.device->dev;
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u64 *sts_ptr;
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dma_addr_t bd_phys;
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dma_addr_t sts_phys;
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int sts_size;
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#ifdef CONFIG_PCI_MSI
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struct tsi721_device *priv = to_tsi721(bdma_chan->dchan.device);
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#endif
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dev_dbg(dev, "Init Block DMA Engine, CH%d\n", bdma_chan->id);
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/*
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* Allocate space for DMA descriptors
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* (add an extra element for link descriptor)
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*/
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bd_ptr = dma_zalloc_coherent(dev,
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(bd_num + 1) * sizeof(struct tsi721_dma_desc),
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&bd_phys, GFP_KERNEL);
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if (!bd_ptr)
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return -ENOMEM;
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bdma_chan->bd_num = bd_num;
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bdma_chan->bd_phys = bd_phys;
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bdma_chan->bd_base = bd_ptr;
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dev_dbg(dev, "DMA descriptors @ %p (phys = %llx)\n",
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bd_ptr, (unsigned long long)bd_phys);
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/* Allocate space for descriptor status FIFO */
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sts_size = ((bd_num + 1) >= TSI721_DMA_MINSTSSZ) ?
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(bd_num + 1) : TSI721_DMA_MINSTSSZ;
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sts_size = roundup_pow_of_two(sts_size);
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sts_ptr = dma_zalloc_coherent(dev,
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sts_size * sizeof(struct tsi721_dma_sts),
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&sts_phys, GFP_KERNEL);
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if (!sts_ptr) {
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/* Free space allocated for DMA descriptors */
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dma_free_coherent(dev,
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(bd_num + 1) * sizeof(struct tsi721_dma_desc),
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bd_ptr, bd_phys);
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bdma_chan->bd_base = NULL;
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return -ENOMEM;
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}
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bdma_chan->sts_phys = sts_phys;
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bdma_chan->sts_base = sts_ptr;
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bdma_chan->sts_size = sts_size;
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dev_dbg(dev,
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"desc status FIFO @ %p (phys = %llx) size=0x%x\n",
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sts_ptr, (unsigned long long)sts_phys, sts_size);
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/* Initialize DMA descriptors ring using added link descriptor */
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bd_ptr[bd_num].type_id = cpu_to_le32(DTYPE3 << 29);
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bd_ptr[bd_num].next_lo = cpu_to_le32((u64)bd_phys &
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TSI721_DMAC_DPTRL_MASK);
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bd_ptr[bd_num].next_hi = cpu_to_le32((u64)bd_phys >> 32);
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/* Setup DMA descriptor pointers */
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iowrite32(((u64)bd_phys >> 32),
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bdma_chan->regs + TSI721_DMAC_DPTRH);
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iowrite32(((u64)bd_phys & TSI721_DMAC_DPTRL_MASK),
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bdma_chan->regs + TSI721_DMAC_DPTRL);
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/* Setup descriptor status FIFO */
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iowrite32(((u64)sts_phys >> 32),
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bdma_chan->regs + TSI721_DMAC_DSBH);
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iowrite32(((u64)sts_phys & TSI721_DMAC_DSBL_MASK),
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bdma_chan->regs + TSI721_DMAC_DSBL);
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iowrite32(TSI721_DMAC_DSSZ_SIZE(sts_size),
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bdma_chan->regs + TSI721_DMAC_DSSZ);
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/* Clear interrupt bits */
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iowrite32(TSI721_DMAC_INT_ALL,
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bdma_chan->regs + TSI721_DMAC_INT);
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ioread32(bdma_chan->regs + TSI721_DMAC_INT);
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#ifdef CONFIG_PCI_MSI
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/* Request interrupt service if we are in MSI-X mode */
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if (priv->flags & TSI721_USING_MSIX) {
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int rc, idx;
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idx = TSI721_VECT_DMA0_DONE + bdma_chan->id;
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rc = request_irq(priv->msix[idx].vector, tsi721_bdma_msix, 0,
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priv->msix[idx].irq_name, (void *)bdma_chan);
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if (rc) {
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dev_dbg(dev, "Unable to get MSI-X for BDMA%d-DONE\n",
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bdma_chan->id);
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goto err_out;
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}
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idx = TSI721_VECT_DMA0_INT + bdma_chan->id;
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rc = request_irq(priv->msix[idx].vector, tsi721_bdma_msix, 0,
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priv->msix[idx].irq_name, (void *)bdma_chan);
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if (rc) {
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dev_dbg(dev, "Unable to get MSI-X for BDMA%d-INT\n",
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bdma_chan->id);
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free_irq(
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priv->msix[TSI721_VECT_DMA0_DONE +
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bdma_chan->id].vector,
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(void *)bdma_chan);
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}
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err_out:
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if (rc) {
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/* Free space allocated for DMA descriptors */
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dma_free_coherent(dev,
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(bd_num + 1) * sizeof(struct tsi721_dma_desc),
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bd_ptr, bd_phys);
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bdma_chan->bd_base = NULL;
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/* Free space allocated for status descriptors */
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dma_free_coherent(dev,
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sts_size * sizeof(struct tsi721_dma_sts),
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sts_ptr, sts_phys);
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bdma_chan->sts_base = NULL;
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return -EIO;
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}
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}
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#endif /* CONFIG_PCI_MSI */
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/* Toggle DMA channel initialization */
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iowrite32(TSI721_DMAC_CTL_INIT, bdma_chan->regs + TSI721_DMAC_CTL);
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ioread32(bdma_chan->regs + TSI721_DMAC_CTL);
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bdma_chan->wr_count = bdma_chan->wr_count_next = 0;
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bdma_chan->sts_rdptr = 0;
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udelay(10);
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return 0;
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}
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static int tsi721_bdma_ch_free(struct tsi721_bdma_chan *bdma_chan)
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{
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u32 ch_stat;
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#ifdef CONFIG_PCI_MSI
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struct tsi721_device *priv = to_tsi721(bdma_chan->dchan.device);
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#endif
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if (bdma_chan->bd_base == NULL)
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return 0;
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/* Check if DMA channel still running */
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ch_stat = ioread32(bdma_chan->regs + TSI721_DMAC_STS);
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if (ch_stat & TSI721_DMAC_STS_RUN)
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return -EFAULT;
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/* Put DMA channel into init state */
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iowrite32(TSI721_DMAC_CTL_INIT, bdma_chan->regs + TSI721_DMAC_CTL);
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#ifdef CONFIG_PCI_MSI
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if (priv->flags & TSI721_USING_MSIX) {
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free_irq(priv->msix[TSI721_VECT_DMA0_DONE +
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bdma_chan->id].vector, (void *)bdma_chan);
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free_irq(priv->msix[TSI721_VECT_DMA0_INT +
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bdma_chan->id].vector, (void *)bdma_chan);
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}
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#endif /* CONFIG_PCI_MSI */
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/* Free space allocated for DMA descriptors */
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dma_free_coherent(bdma_chan->dchan.device->dev,
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(bdma_chan->bd_num + 1) * sizeof(struct tsi721_dma_desc),
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bdma_chan->bd_base, bdma_chan->bd_phys);
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bdma_chan->bd_base = NULL;
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/* Free space allocated for status FIFO */
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dma_free_coherent(bdma_chan->dchan.device->dev,
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bdma_chan->sts_size * sizeof(struct tsi721_dma_sts),
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bdma_chan->sts_base, bdma_chan->sts_phys);
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bdma_chan->sts_base = NULL;
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return 0;
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}
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static void
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tsi721_bdma_interrupt_enable(struct tsi721_bdma_chan *bdma_chan, int enable)
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{
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if (enable) {
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/* Clear pending BDMA channel interrupts */
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iowrite32(TSI721_DMAC_INT_ALL,
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bdma_chan->regs + TSI721_DMAC_INT);
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ioread32(bdma_chan->regs + TSI721_DMAC_INT);
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/* Enable BDMA channel interrupts */
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iowrite32(TSI721_DMAC_INT_ALL,
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bdma_chan->regs + TSI721_DMAC_INTE);
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} else {
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/* Disable BDMA channel interrupts */
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iowrite32(0, bdma_chan->regs + TSI721_DMAC_INTE);
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/* Clear pending BDMA channel interrupts */
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iowrite32(TSI721_DMAC_INT_ALL,
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bdma_chan->regs + TSI721_DMAC_INT);
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}
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}
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static bool tsi721_dma_is_idle(struct tsi721_bdma_chan *bdma_chan)
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{
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u32 sts;
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sts = ioread32(bdma_chan->regs + TSI721_DMAC_STS);
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return ((sts & TSI721_DMAC_STS_RUN) == 0);
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}
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void tsi721_bdma_handler(struct tsi721_bdma_chan *bdma_chan)
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{
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/* Disable BDMA channel interrupts */
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iowrite32(0, bdma_chan->regs + TSI721_DMAC_INTE);
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if (bdma_chan->active)
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tasklet_schedule(&bdma_chan->tasklet);
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}
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#ifdef CONFIG_PCI_MSI
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/**
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* tsi721_omsg_msix - MSI-X interrupt handler for BDMA channels
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* @irq: Linux interrupt number
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* @ptr: Pointer to interrupt-specific data (BDMA channel structure)
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*
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* Handles BDMA channel interrupts signaled using MSI-X.
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*/
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static irqreturn_t tsi721_bdma_msix(int irq, void *ptr)
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{
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struct tsi721_bdma_chan *bdma_chan = ptr;
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tsi721_bdma_handler(bdma_chan);
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return IRQ_HANDLED;
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}
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#endif /* CONFIG_PCI_MSI */
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/* Must be called with the spinlock held */
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static void tsi721_start_dma(struct tsi721_bdma_chan *bdma_chan)
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{
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if (!tsi721_dma_is_idle(bdma_chan)) {
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dev_err(bdma_chan->dchan.device->dev,
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"BUG: Attempt to start non-idle channel\n");
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return;
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}
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if (bdma_chan->wr_count == bdma_chan->wr_count_next) {
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dev_err(bdma_chan->dchan.device->dev,
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"BUG: Attempt to start DMA with no BDs ready\n");
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return;
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}
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dev_dbg(bdma_chan->dchan.device->dev,
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"%s: chan_%d (wrc=%d)\n", __func__, bdma_chan->id,
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bdma_chan->wr_count_next);
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iowrite32(bdma_chan->wr_count_next,
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bdma_chan->regs + TSI721_DMAC_DWRCNT);
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ioread32(bdma_chan->regs + TSI721_DMAC_DWRCNT);
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bdma_chan->wr_count = bdma_chan->wr_count_next;
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}
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static int
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tsi721_desc_fill_init(struct tsi721_tx_desc *desc,
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struct tsi721_dma_desc *bd_ptr,
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struct scatterlist *sg, u32 sys_size)
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{
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u64 rio_addr;
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if (bd_ptr == NULL)
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return -EINVAL;
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/* Initialize DMA descriptor */
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bd_ptr->type_id = cpu_to_le32((DTYPE1 << 29) |
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(desc->rtype << 19) | desc->destid);
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bd_ptr->bcount = cpu_to_le32(((desc->rio_addr & 0x3) << 30) |
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(sys_size << 26));
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rio_addr = (desc->rio_addr >> 2) |
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((u64)(desc->rio_addr_u & 0x3) << 62);
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bd_ptr->raddr_lo = cpu_to_le32(rio_addr & 0xffffffff);
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bd_ptr->raddr_hi = cpu_to_le32(rio_addr >> 32);
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bd_ptr->t1.bufptr_lo = cpu_to_le32(
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(u64)sg_dma_address(sg) & 0xffffffff);
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bd_ptr->t1.bufptr_hi = cpu_to_le32((u64)sg_dma_address(sg) >> 32);
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bd_ptr->t1.s_dist = 0;
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bd_ptr->t1.s_size = 0;
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return 0;
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}
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static int
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tsi721_desc_fill_end(struct tsi721_dma_desc *bd_ptr, u32 bcount, bool interrupt)
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{
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if (bd_ptr == NULL)
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return -EINVAL;
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/* Update DMA descriptor */
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if (interrupt)
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bd_ptr->type_id |= cpu_to_le32(TSI721_DMAD_IOF);
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bd_ptr->bcount |= cpu_to_le32(bcount & TSI721_DMAD_BCOUNT1);
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return 0;
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}
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static void tsi721_dma_tx_err(struct tsi721_bdma_chan *bdma_chan,
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struct tsi721_tx_desc *desc)
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{
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struct dma_async_tx_descriptor *txd = &desc->txd;
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dma_async_tx_callback callback = txd->callback;
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void *param = txd->callback_param;
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list_move(&desc->desc_node, &bdma_chan->free_list);
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if (callback)
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callback(param);
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}
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static void tsi721_clr_stat(struct tsi721_bdma_chan *bdma_chan)
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{
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u32 srd_ptr;
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u64 *sts_ptr;
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int i, j;
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/* Check and clear descriptor status FIFO entries */
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srd_ptr = bdma_chan->sts_rdptr;
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sts_ptr = bdma_chan->sts_base;
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j = srd_ptr * 8;
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while (sts_ptr[j]) {
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for (i = 0; i < 8 && sts_ptr[j]; i++, j++)
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sts_ptr[j] = 0;
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++srd_ptr;
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srd_ptr %= bdma_chan->sts_size;
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j = srd_ptr * 8;
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}
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iowrite32(srd_ptr, bdma_chan->regs + TSI721_DMAC_DSRP);
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bdma_chan->sts_rdptr = srd_ptr;
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}
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/* Must be called with the channel spinlock held */
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static int tsi721_submit_sg(struct tsi721_tx_desc *desc)
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{
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struct dma_chan *dchan = desc->txd.chan;
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struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
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u32 sys_size;
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u64 rio_addr;
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dma_addr_t next_addr;
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u32 bcount;
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struct scatterlist *sg;
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unsigned int i;
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int err = 0;
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struct tsi721_dma_desc *bd_ptr = NULL;
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u32 idx, rd_idx;
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u32 add_count = 0;
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if (!tsi721_dma_is_idle(bdma_chan)) {
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dev_err(bdma_chan->dchan.device->dev,
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"BUG: Attempt to use non-idle channel\n");
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return -EIO;
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}
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/*
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* Fill DMA channel's hardware buffer descriptors.
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* (NOTE: RapidIO destination address is limited to 64 bits for now)
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*/
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rio_addr = desc->rio_addr;
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next_addr = -1;
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bcount = 0;
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sys_size = dma_to_mport(bdma_chan->dchan.device)->sys_size;
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rd_idx = ioread32(bdma_chan->regs + TSI721_DMAC_DRDCNT);
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rd_idx %= (bdma_chan->bd_num + 1);
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|
|
|
idx = bdma_chan->wr_count_next % (bdma_chan->bd_num + 1);
|
|
if (idx == bdma_chan->bd_num) {
|
|
/* wrap around link descriptor */
|
|
idx = 0;
|
|
add_count++;
|
|
}
|
|
|
|
dev_dbg(dchan->device->dev, "%s: BD ring status: rdi=%d wri=%d\n",
|
|
__func__, rd_idx, idx);
|
|
|
|
for_each_sg(desc->sg, sg, desc->sg_len, i) {
|
|
|
|
dev_dbg(dchan->device->dev, "sg%d/%d addr: 0x%llx len: %d\n",
|
|
i, desc->sg_len,
|
|
(unsigned long long)sg_dma_address(sg), sg_dma_len(sg));
|
|
|
|
if (sg_dma_len(sg) > TSI721_BDMA_MAX_BCOUNT) {
|
|
dev_err(dchan->device->dev,
|
|
"%s: SG entry %d is too large\n", __func__, i);
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If this sg entry forms contiguous block with previous one,
|
|
* try to merge it into existing DMA descriptor
|
|
*/
|
|
if (next_addr == sg_dma_address(sg) &&
|
|
bcount + sg_dma_len(sg) <= TSI721_BDMA_MAX_BCOUNT) {
|
|
/* Adjust byte count of the descriptor */
|
|
bcount += sg_dma_len(sg);
|
|
goto entry_done;
|
|
} else if (next_addr != -1) {
|
|
/* Finalize descriptor using total byte count value */
|
|
tsi721_desc_fill_end(bd_ptr, bcount, 0);
|
|
dev_dbg(dchan->device->dev,
|
|
"%s: prev desc final len: %d\n",
|
|
__func__, bcount);
|
|
}
|
|
|
|
desc->rio_addr = rio_addr;
|
|
|
|
if (i && idx == rd_idx) {
|
|
dev_dbg(dchan->device->dev,
|
|
"%s: HW descriptor ring is full @ %d\n",
|
|
__func__, i);
|
|
desc->sg = sg;
|
|
desc->sg_len -= i;
|
|
break;
|
|
}
|
|
|
|
bd_ptr = &((struct tsi721_dma_desc *)bdma_chan->bd_base)[idx];
|
|
err = tsi721_desc_fill_init(desc, bd_ptr, sg, sys_size);
|
|
if (err) {
|
|
dev_err(dchan->device->dev,
|
|
"Failed to build desc: err=%d\n", err);
|
|
break;
|
|
}
|
|
|
|
dev_dbg(dchan->device->dev, "bd_ptr = %p did=%d raddr=0x%llx\n",
|
|
bd_ptr, desc->destid, desc->rio_addr);
|
|
|
|
next_addr = sg_dma_address(sg);
|
|
bcount = sg_dma_len(sg);
|
|
|
|
add_count++;
|
|
if (++idx == bdma_chan->bd_num) {
|
|
/* wrap around link descriptor */
|
|
idx = 0;
|
|
add_count++;
|
|
}
|
|
|
|
entry_done:
|
|
if (sg_is_last(sg)) {
|
|
tsi721_desc_fill_end(bd_ptr, bcount, 0);
|
|
dev_dbg(dchan->device->dev, "%s: last desc final len: %d\n",
|
|
__func__, bcount);
|
|
desc->sg_len = 0;
|
|
} else {
|
|
rio_addr += sg_dma_len(sg);
|
|
next_addr += sg_dma_len(sg);
|
|
}
|
|
}
|
|
|
|
if (!err)
|
|
bdma_chan->wr_count_next += add_count;
|
|
|
|
return err;
|
|
}
|
|
|
|
static void tsi721_advance_work(struct tsi721_bdma_chan *bdma_chan)
|
|
{
|
|
struct tsi721_tx_desc *desc;
|
|
int err;
|
|
|
|
dev_dbg(bdma_chan->dchan.device->dev, "%s: Enter\n", __func__);
|
|
|
|
/*
|
|
* If there are any new transactions in the queue add them
|
|
* into the processing list
|
|
*/
|
|
if (!list_empty(&bdma_chan->queue))
|
|
list_splice_init(&bdma_chan->queue, &bdma_chan->active_list);
|
|
|
|
/* Start new transaction (if available) */
|
|
if (!list_empty(&bdma_chan->active_list)) {
|
|
desc = tsi721_dma_first_active(bdma_chan);
|
|
err = tsi721_submit_sg(desc);
|
|
if (!err)
|
|
tsi721_start_dma(bdma_chan);
|
|
else {
|
|
tsi721_dma_tx_err(bdma_chan, desc);
|
|
dev_dbg(bdma_chan->dchan.device->dev,
|
|
"ERR: tsi721_submit_sg failed with err=%d\n",
|
|
err);
|
|
}
|
|
}
|
|
|
|
dev_dbg(bdma_chan->dchan.device->dev, "%s: Exit\n", __func__);
|
|
}
|
|
|
|
static void tsi721_dma_tasklet(unsigned long data)
|
|
{
|
|
struct tsi721_bdma_chan *bdma_chan = (struct tsi721_bdma_chan *)data;
|
|
u32 dmac_int, dmac_sts;
|
|
|
|
dmac_int = ioread32(bdma_chan->regs + TSI721_DMAC_INT);
|
|
dev_dbg(bdma_chan->dchan.device->dev, "%s: DMAC%d_INT = 0x%x\n",
|
|
__func__, bdma_chan->id, dmac_int);
|
|
/* Clear channel interrupts */
|
|
iowrite32(dmac_int, bdma_chan->regs + TSI721_DMAC_INT);
|
|
|
|
if (dmac_int & TSI721_DMAC_INT_ERR) {
|
|
dmac_sts = ioread32(bdma_chan->regs + TSI721_DMAC_STS);
|
|
dev_err(bdma_chan->dchan.device->dev,
|
|
"%s: DMA ERROR - DMAC%d_STS = 0x%x\n",
|
|
__func__, bdma_chan->id, dmac_sts);
|
|
}
|
|
|
|
if (dmac_int & TSI721_DMAC_INT_STFULL) {
|
|
dev_err(bdma_chan->dchan.device->dev,
|
|
"%s: DMAC%d descriptor status FIFO is full\n",
|
|
__func__, bdma_chan->id);
|
|
}
|
|
|
|
if (dmac_int & (TSI721_DMAC_INT_DONE | TSI721_DMAC_INT_IOFDONE)) {
|
|
struct tsi721_tx_desc *desc;
|
|
|
|
tsi721_clr_stat(bdma_chan);
|
|
spin_lock(&bdma_chan->lock);
|
|
desc = tsi721_dma_first_active(bdma_chan);
|
|
|
|
if (desc->sg_len == 0) {
|
|
dma_async_tx_callback callback = NULL;
|
|
void *param = NULL;
|
|
|
|
desc->status = DMA_COMPLETE;
|
|
dma_cookie_complete(&desc->txd);
|
|
if (desc->txd.flags & DMA_PREP_INTERRUPT) {
|
|
callback = desc->txd.callback;
|
|
param = desc->txd.callback_param;
|
|
}
|
|
list_move(&desc->desc_node, &bdma_chan->free_list);
|
|
spin_unlock(&bdma_chan->lock);
|
|
if (callback)
|
|
callback(param);
|
|
spin_lock(&bdma_chan->lock);
|
|
}
|
|
|
|
tsi721_advance_work(bdma_chan);
|
|
spin_unlock(&bdma_chan->lock);
|
|
}
|
|
|
|
/* Re-Enable BDMA channel interrupts */
|
|
iowrite32(TSI721_DMAC_INT_ALL, bdma_chan->regs + TSI721_DMAC_INTE);
|
|
}
|
|
|
|
static dma_cookie_t tsi721_tx_submit(struct dma_async_tx_descriptor *txd)
|
|
{
|
|
struct tsi721_tx_desc *desc = to_tsi721_desc(txd);
|
|
struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(txd->chan);
|
|
dma_cookie_t cookie;
|
|
|
|
/* Check if the descriptor is detached from any lists */
|
|
if (!list_empty(&desc->desc_node)) {
|
|
dev_err(bdma_chan->dchan.device->dev,
|
|
"%s: wrong state of descriptor %p\n", __func__, txd);
|
|
return -EIO;
|
|
}
|
|
|
|
spin_lock_bh(&bdma_chan->lock);
|
|
|
|
if (!bdma_chan->active) {
|
|
spin_unlock_bh(&bdma_chan->lock);
|
|
return -ENODEV;
|
|
}
|
|
|
|
cookie = dma_cookie_assign(txd);
|
|
desc->status = DMA_IN_PROGRESS;
|
|
list_add_tail(&desc->desc_node, &bdma_chan->queue);
|
|
|
|
spin_unlock_bh(&bdma_chan->lock);
|
|
return cookie;
|
|
}
|
|
|
|
static int tsi721_alloc_chan_resources(struct dma_chan *dchan)
|
|
{
|
|
struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
|
|
struct tsi721_tx_desc *desc = NULL;
|
|
int i;
|
|
|
|
dev_dbg(dchan->device->dev, "%s: for channel %d\n",
|
|
__func__, bdma_chan->id);
|
|
|
|
if (bdma_chan->bd_base)
|
|
return TSI721_DMA_TX_QUEUE_SZ;
|
|
|
|
/* Initialize BDMA channel */
|
|
if (tsi721_bdma_ch_init(bdma_chan, dma_desc_per_channel)) {
|
|
dev_err(dchan->device->dev, "Unable to initialize data DMA"
|
|
" channel %d, aborting\n", bdma_chan->id);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Allocate queue of transaction descriptors */
|
|
desc = kcalloc(TSI721_DMA_TX_QUEUE_SZ, sizeof(struct tsi721_tx_desc),
|
|
GFP_KERNEL);
|
|
if (!desc) {
|
|
dev_err(dchan->device->dev,
|
|
"Failed to allocate logical descriptors\n");
|
|
tsi721_bdma_ch_free(bdma_chan);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
bdma_chan->tx_desc = desc;
|
|
|
|
for (i = 0; i < TSI721_DMA_TX_QUEUE_SZ; i++) {
|
|
dma_async_tx_descriptor_init(&desc[i].txd, dchan);
|
|
desc[i].txd.tx_submit = tsi721_tx_submit;
|
|
desc[i].txd.flags = DMA_CTRL_ACK;
|
|
list_add(&desc[i].desc_node, &bdma_chan->free_list);
|
|
}
|
|
|
|
dma_cookie_init(dchan);
|
|
|
|
bdma_chan->active = true;
|
|
tsi721_bdma_interrupt_enable(bdma_chan, 1);
|
|
|
|
return TSI721_DMA_TX_QUEUE_SZ;
|
|
}
|
|
|
|
static void tsi721_sync_dma_irq(struct tsi721_bdma_chan *bdma_chan)
|
|
{
|
|
struct tsi721_device *priv = to_tsi721(bdma_chan->dchan.device);
|
|
|
|
#ifdef CONFIG_PCI_MSI
|
|
if (priv->flags & TSI721_USING_MSIX) {
|
|
synchronize_irq(priv->msix[TSI721_VECT_DMA0_DONE +
|
|
bdma_chan->id].vector);
|
|
synchronize_irq(priv->msix[TSI721_VECT_DMA0_INT +
|
|
bdma_chan->id].vector);
|
|
} else
|
|
#endif
|
|
synchronize_irq(priv->pdev->irq);
|
|
}
|
|
|
|
static void tsi721_free_chan_resources(struct dma_chan *dchan)
|
|
{
|
|
struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
|
|
|
|
dev_dbg(dchan->device->dev, "%s: for channel %d\n",
|
|
__func__, bdma_chan->id);
|
|
|
|
if (bdma_chan->bd_base == NULL)
|
|
return;
|
|
|
|
BUG_ON(!list_empty(&bdma_chan->active_list));
|
|
BUG_ON(!list_empty(&bdma_chan->queue));
|
|
|
|
tsi721_bdma_interrupt_enable(bdma_chan, 0);
|
|
bdma_chan->active = false;
|
|
tsi721_sync_dma_irq(bdma_chan);
|
|
tasklet_kill(&bdma_chan->tasklet);
|
|
INIT_LIST_HEAD(&bdma_chan->free_list);
|
|
kfree(bdma_chan->tx_desc);
|
|
tsi721_bdma_ch_free(bdma_chan);
|
|
}
|
|
|
|
static
|
|
enum dma_status tsi721_tx_status(struct dma_chan *dchan, dma_cookie_t cookie,
|
|
struct dma_tx_state *txstate)
|
|
{
|
|
return dma_cookie_status(dchan, cookie, txstate);
|
|
}
|
|
|
|
static void tsi721_issue_pending(struct dma_chan *dchan)
|
|
{
|
|
struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
|
|
|
|
dev_dbg(dchan->device->dev, "%s: Enter\n", __func__);
|
|
|
|
if (tsi721_dma_is_idle(bdma_chan) && bdma_chan->active) {
|
|
spin_lock_bh(&bdma_chan->lock);
|
|
tsi721_advance_work(bdma_chan);
|
|
spin_unlock_bh(&bdma_chan->lock);
|
|
}
|
|
}
|
|
|
|
static
|
|
struct dma_async_tx_descriptor *tsi721_prep_rio_sg(struct dma_chan *dchan,
|
|
struct scatterlist *sgl, unsigned int sg_len,
|
|
enum dma_transfer_direction dir, unsigned long flags,
|
|
void *tinfo)
|
|
{
|
|
struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
|
|
struct tsi721_tx_desc *desc, *_d;
|
|
struct rio_dma_ext *rext = tinfo;
|
|
enum dma_rtype rtype;
|
|
struct dma_async_tx_descriptor *txd = NULL;
|
|
|
|
if (!sgl || !sg_len) {
|
|
dev_err(dchan->device->dev, "%s: No SG list\n", __func__);
|
|
return NULL;
|
|
}
|
|
|
|
dev_dbg(dchan->device->dev, "%s: %s\n", __func__,
|
|
(dir == DMA_DEV_TO_MEM)?"READ":"WRITE");
|
|
|
|
if (dir == DMA_DEV_TO_MEM)
|
|
rtype = NREAD;
|
|
else if (dir == DMA_MEM_TO_DEV) {
|
|
switch (rext->wr_type) {
|
|
case RDW_ALL_NWRITE:
|
|
rtype = ALL_NWRITE;
|
|
break;
|
|
case RDW_ALL_NWRITE_R:
|
|
rtype = ALL_NWRITE_R;
|
|
break;
|
|
case RDW_LAST_NWRITE_R:
|
|
default:
|
|
rtype = LAST_NWRITE_R;
|
|
break;
|
|
}
|
|
} else {
|
|
dev_err(dchan->device->dev,
|
|
"%s: Unsupported DMA direction option\n", __func__);
|
|
return NULL;
|
|
}
|
|
|
|
spin_lock_bh(&bdma_chan->lock);
|
|
|
|
list_for_each_entry_safe(desc, _d, &bdma_chan->free_list, desc_node) {
|
|
if (async_tx_test_ack(&desc->txd)) {
|
|
list_del_init(&desc->desc_node);
|
|
desc->destid = rext->destid;
|
|
desc->rio_addr = rext->rio_addr;
|
|
desc->rio_addr_u = 0;
|
|
desc->rtype = rtype;
|
|
desc->sg_len = sg_len;
|
|
desc->sg = sgl;
|
|
txd = &desc->txd;
|
|
txd->flags = flags;
|
|
break;
|
|
}
|
|
}
|
|
|
|
spin_unlock_bh(&bdma_chan->lock);
|
|
|
|
return txd;
|
|
}
|
|
|
|
static int tsi721_terminate_all(struct dma_chan *dchan)
|
|
{
|
|
struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
|
|
struct tsi721_tx_desc *desc, *_d;
|
|
u32 dmac_int;
|
|
LIST_HEAD(list);
|
|
|
|
dev_dbg(dchan->device->dev, "%s: Entry\n", __func__);
|
|
|
|
spin_lock_bh(&bdma_chan->lock);
|
|
|
|
bdma_chan->active = false;
|
|
|
|
if (!tsi721_dma_is_idle(bdma_chan)) {
|
|
/* make sure to stop the transfer */
|
|
iowrite32(TSI721_DMAC_CTL_SUSP,
|
|
bdma_chan->regs + TSI721_DMAC_CTL);
|
|
|
|
/* Wait until DMA channel stops */
|
|
do {
|
|
dmac_int = ioread32(bdma_chan->regs + TSI721_DMAC_INT);
|
|
} while ((dmac_int & TSI721_DMAC_INT_SUSP) == 0);
|
|
}
|
|
|
|
list_splice_init(&bdma_chan->active_list, &list);
|
|
list_splice_init(&bdma_chan->queue, &list);
|
|
|
|
list_for_each_entry_safe(desc, _d, &list, desc_node)
|
|
tsi721_dma_tx_err(bdma_chan, desc);
|
|
|
|
spin_unlock_bh(&bdma_chan->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int tsi721_register_dma(struct tsi721_device *priv)
|
|
{
|
|
int i;
|
|
int nr_channels = 0;
|
|
int err;
|
|
struct rio_mport *mport = priv->mport;
|
|
|
|
INIT_LIST_HEAD(&mport->dma.channels);
|
|
|
|
for (i = 0; i < TSI721_DMA_MAXCH; i++) {
|
|
struct tsi721_bdma_chan *bdma_chan = &priv->bdma[i];
|
|
|
|
if (i == TSI721_DMACH_MAINT)
|
|
continue;
|
|
|
|
bdma_chan->regs = priv->regs + TSI721_DMAC_BASE(i);
|
|
|
|
bdma_chan->dchan.device = &mport->dma;
|
|
bdma_chan->dchan.cookie = 1;
|
|
bdma_chan->dchan.chan_id = i;
|
|
bdma_chan->id = i;
|
|
bdma_chan->active = false;
|
|
|
|
spin_lock_init(&bdma_chan->lock);
|
|
|
|
INIT_LIST_HEAD(&bdma_chan->active_list);
|
|
INIT_LIST_HEAD(&bdma_chan->queue);
|
|
INIT_LIST_HEAD(&bdma_chan->free_list);
|
|
|
|
tasklet_init(&bdma_chan->tasklet, tsi721_dma_tasklet,
|
|
(unsigned long)bdma_chan);
|
|
list_add_tail(&bdma_chan->dchan.device_node,
|
|
&mport->dma.channels);
|
|
nr_channels++;
|
|
}
|
|
|
|
mport->dma.chancnt = nr_channels;
|
|
dma_cap_zero(mport->dma.cap_mask);
|
|
dma_cap_set(DMA_PRIVATE, mport->dma.cap_mask);
|
|
dma_cap_set(DMA_SLAVE, mport->dma.cap_mask);
|
|
|
|
mport->dma.dev = &priv->pdev->dev;
|
|
mport->dma.device_alloc_chan_resources = tsi721_alloc_chan_resources;
|
|
mport->dma.device_free_chan_resources = tsi721_free_chan_resources;
|
|
mport->dma.device_tx_status = tsi721_tx_status;
|
|
mport->dma.device_issue_pending = tsi721_issue_pending;
|
|
mport->dma.device_prep_slave_sg = tsi721_prep_rio_sg;
|
|
mport->dma.device_terminate_all = tsi721_terminate_all;
|
|
|
|
err = dma_async_device_register(&mport->dma);
|
|
if (err)
|
|
dev_err(&priv->pdev->dev, "Failed to register DMA device\n");
|
|
|
|
return err;
|
|
}
|