| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <1414531573-18807-37-git-send-email-maxime.ripard@free-electrons.com>
Date: Tue, 28 Oct 2014 22:25:51 +0100
From: Maxime Ripard <maxime.ripard@...e-electrons.com>
To: Vinod Koul <vinod.koul@...el.com>, dmaengine@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Antoine Ténart <antoine@...e-electrons.com>,
Russell King <linux@....linux.org.uk>, lars@...afoo.de,
Maxime Ripard <maxime.ripard@...e-electrons.com>
Subject: [PATCH v4 36/58] dmaengine: s3c24xx: Split device_control
Split the device_control callback of the Samsung S3C24xxx DMA driver to make
use of the newly introduced callbacks, that will eventually be used to retrieve
slave capabilities.
Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
---
drivers/dma/s3c24xx-dma.c | 75 +++++++++++++++++++++++------------------------
1 file changed, 36 insertions(+), 39 deletions(-)
diff --git a/drivers/dma/s3c24xx-dma.c b/drivers/dma/s3c24xx-dma.c
index 7416572d1e40..2177bf5a742c 100644
--- a/drivers/dma/s3c24xx-dma.c
+++ b/drivers/dma/s3c24xx-dma.c
@@ -384,20 +384,30 @@ static u32 s3c24xx_dma_getbytes_chan(struct s3c24xx_dma_chan *s3cchan)
return tc * txd->width;
}
-static int s3c24xx_dma_set_runtime_config(struct s3c24xx_dma_chan *s3cchan,
+static int s3c24xx_dma_set_runtime_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
- if (!s3cchan->slave)
- return -EINVAL;
+ struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan);
+ unsigned long flags;
+ int ret = 0;
/* Reject definitely invalid configurations */
if (config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES ||
config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
return -EINVAL;
+ spin_lock_irqsave(&s3cchan->vc.lock, flags);
+
+ if (!s3cchan->slave) {
+ ret = -EINVAL;
+ goto out;
+ }
+
s3cchan->cfg = *config;
- return 0;
+out:
+ spin_lock_irqrestore(&s3cchan->vc.lock, flags);
+ return ret;
}
/*
@@ -703,53 +713,38 @@ static irqreturn_t s3c24xx_dma_irq(int irq, void *data)
* The DMA ENGINE API
*/
-static int s3c24xx_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
- unsigned long arg)
+static int s3c24xx_dma_terminate_all(struct dma_chan *chan)
{
struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan);
struct s3c24xx_dma_engine *s3cdma = s3cchan->host;
unsigned long flags;
- int ret = 0;
spin_lock_irqsave(&s3cchan->vc.lock, flags);
- switch (cmd) {
- case DMA_SLAVE_CONFIG:
- ret = s3c24xx_dma_set_runtime_config(s3cchan,
- (struct dma_slave_config *)arg);
- break;
- case DMA_TERMINATE_ALL:
- if (!s3cchan->phy && !s3cchan->at) {
- dev_err(&s3cdma->pdev->dev, "trying to terminate already stopped channel %d\n",
- s3cchan->id);
- ret = -EINVAL;
- break;
- }
-
- s3cchan->state = S3C24XX_DMA_CHAN_IDLE;
+ if (!s3cchan->phy && !s3cchan->at) {
+ dev_err(&s3cdma->pdev->dev, "trying to terminate already stopped channel %d\n",
+ s3cchan->id);
+ return -EINVAL;
+ }
- /* Mark physical channel as free */
- if (s3cchan->phy)
- s3c24xx_dma_phy_free(s3cchan);
+ s3cchan->state = S3C24XX_DMA_CHAN_IDLE;
- /* Dequeue current job */
- if (s3cchan->at) {
- s3c24xx_dma_desc_free(&s3cchan->at->vd);
- s3cchan->at = NULL;
- }
+ /* Mark physical channel as free */
+ if (s3cchan->phy)
+ s3c24xx_dma_phy_free(s3cchan);
- /* Dequeue jobs not yet fired as well */
- s3c24xx_dma_free_txd_list(s3cdma, s3cchan);
- break;
- default:
- /* Unknown command */
- ret = -ENXIO;
- break;
+ /* Dequeue current job */
+ if (s3cchan->at) {
+ s3c24xx_dma_desc_free(&s3cchan->at->vd);
+ s3cchan->at = NULL;
}
+ /* Dequeue jobs not yet fired as well */
+ s3c24xx_dma_free_txd_list(s3cdma, s3cchan);
+
spin_unlock_irqrestore(&s3cchan->vc.lock, flags);
- return ret;
+ return 0;
}
static int s3c24xx_dma_alloc_chan_resources(struct dma_chan *chan)
@@ -1300,7 +1295,8 @@ static int s3c24xx_dma_probe(struct platform_device *pdev)
s3cdma->memcpy.device_prep_dma_memcpy = s3c24xx_dma_prep_memcpy;
s3cdma->memcpy.device_tx_status = s3c24xx_dma_tx_status;
s3cdma->memcpy.device_issue_pending = s3c24xx_dma_issue_pending;
- s3cdma->memcpy.device_control = s3c24xx_dma_control;
+ s3cdma->memcpy.device_config = s3c24xx_dma_set_runtime_config;
+ s3cdma->memcpy.device_terminate_all = s3c24xx_dma_terminate_all;
/* Initialize slave engine for SoC internal dedicated peripherals */
dma_cap_set(DMA_SLAVE, s3cdma->slave.cap_mask);
@@ -1315,7 +1311,8 @@ static int s3c24xx_dma_probe(struct platform_device *pdev)
s3cdma->slave.device_issue_pending = s3c24xx_dma_issue_pending;
s3cdma->slave.device_prep_slave_sg = s3c24xx_dma_prep_slave_sg;
s3cdma->slave.device_prep_dma_cyclic = s3c24xx_dma_prep_dma_cyclic;
- s3cdma->slave.device_control = s3c24xx_dma_control;
+ s3cdma->slave.device_config = s3c24xx_dma_set_runtime_config;
+ s3cdma->slave.device_terminate_all = s3c24xx_dma_terminate_all;
/* Register as many memcpy channels as there are physical channels */
ret = s3c24xx_dma_init_virtual_channels(s3cdma, &s3cdma->memcpy,
--
2.1.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists