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Merge branch 'topic/renesas' into for-linus

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This commit is contained in:
Vinod Koul 2018-08-17 17:58:44 +05:30
commit 89b7e78fb2
2 changed files with 47 additions and 66 deletions
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1
Documentation/devicetree/bindings/dma/renesas,rcar-dmac.txt
View File

@ -29,6 +29,7 @@ Required Properties:
- "renesas,dmac-r8a77965" (R-Car M3-N)
- "renesas,dmac-r8a77970" (R-Car V3M)
- "renesas,dmac-r8a77980" (R-Car V3H)
- "renesas,dmac-r8a77990" (R-Car E3)
- "renesas,dmac-r8a77995" (R-Car D3)
- reg: base address and length of the registers block for the DMAC

112
drivers/dma/sh/rcar-dmac.c
View File

@ -1,13 +1,10 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Renesas R-Car Gen2 DMA Controller Driver
*
* Copyright (C) 2014 Renesas Electronics Inc.
*
* Author: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*
* This is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*/
#include <linux/delay.h>
@ -431,7 +428,8 @@ static void rcar_dmac_chan_start_xfer(struct rcar_dmac_chan *chan)
chcr |= RCAR_DMACHCR_DPM_DISABLED | RCAR_DMACHCR_IE;
}
rcar_dmac_chan_write(chan, RCAR_DMACHCR, chcr | RCAR_DMACHCR_DE);
rcar_dmac_chan_write(chan, RCAR_DMACHCR,
chcr | RCAR_DMACHCR_DE | RCAR_DMACHCR_CAIE);
}
static int rcar_dmac_init(struct rcar_dmac *dmac)
@ -761,21 +759,15 @@ static void rcar_dmac_chcr_de_barrier(struct rcar_dmac_chan *chan)
dev_err(chan->chan.device->dev, "CHCR DE check error\n");
}
static void rcar_dmac_sync_tcr(struct rcar_dmac_chan *chan)
static void rcar_dmac_clear_chcr_de(struct rcar_dmac_chan *chan)
{
u32 chcr = rcar_dmac_chan_read(chan, RCAR_DMACHCR);
if (!(chcr & RCAR_DMACHCR_DE))
return;
/* set DE=0 and flush remaining data */
rcar_dmac_chan_write(chan, RCAR_DMACHCR, (chcr & ~RCAR_DMACHCR_DE));
/* make sure all remaining data was flushed */
rcar_dmac_chcr_de_barrier(chan);
/* back DE */
rcar_dmac_chan_write(chan, RCAR_DMACHCR, chcr);
}
static void rcar_dmac_chan_halt(struct rcar_dmac_chan *chan)
@ -783,7 +775,8 @@ static void rcar_dmac_chan_halt(struct rcar_dmac_chan *chan)
u32 chcr = rcar_dmac_chan_read(chan, RCAR_DMACHCR);
chcr &= ~(RCAR_DMACHCR_DSE | RCAR_DMACHCR_DSIE | RCAR_DMACHCR_IE |
RCAR_DMACHCR_TE | RCAR_DMACHCR_DE);
RCAR_DMACHCR_TE | RCAR_DMACHCR_DE |
RCAR_DMACHCR_CAE | RCAR_DMACHCR_CAIE);
rcar_dmac_chan_write(chan, RCAR_DMACHCR, chcr);
rcar_dmac_chcr_de_barrier(chan);
}
@ -812,12 +805,7 @@ static void rcar_dmac_chan_reinit(struct rcar_dmac_chan *chan)
}
}
static void rcar_dmac_stop(struct rcar_dmac *dmac)
{
rcar_dmac_write(dmac, RCAR_DMAOR, 0);
}
static void rcar_dmac_abort(struct rcar_dmac *dmac)
static void rcar_dmac_stop_all_chan(struct rcar_dmac *dmac)
{
unsigned int i;
@ -826,14 +814,24 @@ static void rcar_dmac_abort(struct rcar_dmac *dmac)
struct rcar_dmac_chan *chan = &dmac->channels[i];
/* Stop and reinitialize the channel. */
spin_lock(&chan->lock);
spin_lock_irq(&chan->lock);
rcar_dmac_chan_halt(chan);
spin_unlock(&chan->lock);
rcar_dmac_chan_reinit(chan);
spin_unlock_irq(&chan->lock);
}
}
static int rcar_dmac_chan_pause(struct dma_chan *chan)
{
unsigned long flags;
struct rcar_dmac_chan *rchan = to_rcar_dmac_chan(chan);
spin_lock_irqsave(&rchan->lock, flags);
rcar_dmac_clear_chcr_de(rchan);
spin_unlock_irqrestore(&rchan->lock, flags);
return 0;
}
/* -----------------------------------------------------------------------------
* Descriptors preparation
*/
@ -1355,9 +1353,6 @@ static unsigned int rcar_dmac_chan_get_residue(struct rcar_dmac_chan *chan,
residue += chunk->size;
}
if (desc->direction == DMA_DEV_TO_MEM)
rcar_dmac_sync_tcr(chan);
/* Add the residue for the current chunk. */
residue += rcar_dmac_chan_read(chan, RCAR_DMATCRB) << desc->xfer_shift;
@ -1522,11 +1517,26 @@ static irqreturn_t rcar_dmac_isr_channel(int irq, void *dev)
u32 mask = RCAR_DMACHCR_DSE | RCAR_DMACHCR_TE;
struct rcar_dmac_chan *chan = dev;
irqreturn_t ret = IRQ_NONE;
bool reinit = false;
u32 chcr;
spin_lock(&chan->lock);
chcr = rcar_dmac_chan_read(chan, RCAR_DMACHCR);
if (chcr & RCAR_DMACHCR_CAE) {
struct rcar_dmac *dmac = to_rcar_dmac(chan->chan.device);
/*
* We don't need to call rcar_dmac_chan_halt()
* because channel is already stopped in error case.
* We need to clear register and check DE bit as recovery.
*/
rcar_dmac_write(dmac, RCAR_DMACHCLR, 1 << chan->index);
rcar_dmac_chcr_de_barrier(chan);
reinit = true;
goto spin_lock_end;
}
if (chcr & RCAR_DMACHCR_TE)
mask |= RCAR_DMACHCR_DE;
rcar_dmac_chan_write(chan, RCAR_DMACHCR, chcr & ~mask);
@ -1539,8 +1549,16 @@ static irqreturn_t rcar_dmac_isr_channel(int irq, void *dev)
if (chcr & RCAR_DMACHCR_TE)
ret |= rcar_dmac_isr_transfer_end(chan);
spin_lock_end:
spin_unlock(&chan->lock);
if (reinit) {
dev_err(chan->chan.device->dev, "Channel Address Error\n");
rcar_dmac_chan_reinit(chan);
ret = IRQ_HANDLED;
}
return ret;
}
@ -1597,24 +1615,6 @@ static irqreturn_t rcar_dmac_isr_channel_thread(int irq, void *dev)
return IRQ_HANDLED;
}
static irqreturn_t rcar_dmac_isr_error(int irq, void *data)
{
struct rcar_dmac *dmac = data;
if (!(rcar_dmac_read(dmac, RCAR_DMAOR) & RCAR_DMAOR_AE))
return IRQ_NONE;
/*
* An unrecoverable error occurred on an unknown channel. Halt the DMAC,
* abort transfers on all channels, and reinitialize the DMAC.
*/
rcar_dmac_stop(dmac);
rcar_dmac_abort(dmac);
rcar_dmac_init(dmac);
return IRQ_HANDLED;
}
/* -----------------------------------------------------------------------------
* OF xlate and channel filter
*/
@ -1784,8 +1784,6 @@ static int rcar_dmac_probe(struct platform_device *pdev)
struct rcar_dmac *dmac;
struct resource *mem;
unsigned int i;
char *irqname;
int irq;
int ret;
dmac = devm_kzalloc(&pdev->dev, sizeof(*dmac), GFP_KERNEL);
@ -1824,17 +1822,6 @@ static int rcar_dmac_probe(struct platform_device *pdev)
if (IS_ERR(dmac->iomem))
return PTR_ERR(dmac->iomem);
irq = platform_get_irq_byname(pdev, "error");
if (irq < 0) {
dev_err(&pdev->dev, "no error IRQ specified\n");
return -ENODEV;
}
irqname = devm_kasprintf(dmac->dev, GFP_KERNEL, "%s:error",
dev_name(dmac->dev));
if (!irqname)
return -ENOMEM;
/* Enable runtime PM and initialize the device. */
pm_runtime_enable(&pdev->dev);
ret = pm_runtime_get_sync(&pdev->dev);
@ -1871,6 +1858,7 @@ static int rcar_dmac_probe(struct platform_device *pdev)
engine->device_prep_slave_sg = rcar_dmac_prep_slave_sg;
engine->device_prep_dma_cyclic = rcar_dmac_prep_dma_cyclic;
engine->device_config = rcar_dmac_device_config;
engine->device_pause = rcar_dmac_chan_pause;
engine->device_terminate_all = rcar_dmac_chan_terminate_all;
engine->device_tx_status = rcar_dmac_tx_status;
engine->device_issue_pending = rcar_dmac_issue_pending;
@ -1885,14 +1873,6 @@ static int rcar_dmac_probe(struct platform_device *pdev)
goto error;
}
ret = devm_request_irq(&pdev->dev, irq, rcar_dmac_isr_error, 0,
irqname, dmac);
if (ret) {
dev_err(&pdev->dev, "failed to request IRQ %u (%d)\n",
irq, ret);
return ret;
}
/* Register the DMAC as a DMA provider for DT. */
ret = of_dma_controller_register(pdev->dev.of_node, rcar_dmac_of_xlate,
NULL);
@ -1932,7 +1912,7 @@ static void rcar_dmac_shutdown(struct platform_device *pdev)
{
struct rcar_dmac *dmac = platform_get_drvdata(pdev);
rcar_dmac_stop(dmac);
rcar_dmac_stop_all_chan(dmac);
}
static const struct of_device_id rcar_dmac_of_ids[] = {