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Subject[PATCH 07/39] dmaengine: ste_dma40: Only use addresses passed as configuration information
Date
Addresses are passed in from the client's driver via the invocation of
dmaengine_slave_config(), so there's no need to fetch them from platform
data too, hardwired or otherwise. This is a great step forward, as it
elevates a large burden from platform data in the way of a look-up
table.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
drivers/dma/ste_dma40.c | 51 ++++++++++-------------------------------------
1 file changed, 11 insertions(+), 40 deletions(-)

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index ba84df8..57a127e 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -1774,22 +1774,6 @@ static int d40_validate_conf(struct d40_chan *d40c,
res = -EINVAL;
}

- if (conf->dir == STEDMA40_MEM_TO_PERIPH &&
- d40c->base->plat_data->dev_tx[conf->dev_type] == 0 &&
- d40c->runtime_addr == 0) {
- chan_err(d40c, "Invalid TX channel address (%d)\n",
- conf->dev_type);
- res = -EINVAL;
- }
-
- if (conf->dir == STEDMA40_PERIPH_TO_MEM &&
- d40c->base->plat_data->dev_rx[conf->dev_type] == 0 &&
- d40c->runtime_addr == 0) {
- chan_err(d40c, "Invalid RX channel address (%d)\n",
- conf->dev_type);
- res = -EINVAL;
- }
-
if (conf->dir == STEDMA40_PERIPH_TO_PERIPH) {
/*
* DMAC HW supports it. Will be added to this driver,
@@ -2327,14 +2311,10 @@ d40_prep_sg(struct dma_chan *dchan, struct scatterlist *sg_src,
if (sg_next(&sg_src[sg_len - 1]) == sg_src)
desc->cyclic = true;

- if (direction != DMA_TRANS_NONE) {
- dma_addr_t dev_addr = d40_get_dev_addr(chan, direction);
-
- if (direction == DMA_DEV_TO_MEM)
- src_dev_addr = dev_addr;
- else if (direction == DMA_MEM_TO_DEV)
- dst_dev_addr = dev_addr;
- }
+ if (direction == DMA_DEV_TO_MEM)
+ src_dev_addr = chan->runtime_addr;
+ else if (direction == DMA_MEM_TO_DEV)
+ dst_dev_addr = chan->runtime_addr;

if (chan_is_logical(chan))
ret = d40_prep_sg_log(chan, desc, sg_src, sg_dst,
@@ -2782,15 +2762,8 @@ static int d40_set_runtime_config(struct dma_chan *chan,
dst_maxburst = config->dst_maxburst;

if (config->direction == DMA_DEV_TO_MEM) {
- dma_addr_t dev_addr_rx =
- d40c->base->plat_data->dev_rx[cfg->dev_type];
-
config_addr = config->src_addr;
- if (dev_addr_rx)
- dev_dbg(d40c->base->dev,
- "channel has a pre-wired RX address %08x "
- "overriding with %08x\n",
- dev_addr_rx, config_addr);
+
if (cfg->dir != STEDMA40_PERIPH_TO_MEM)
dev_dbg(d40c->base->dev,
"channel was not configured for peripheral "
@@ -2805,15 +2778,8 @@ static int d40_set_runtime_config(struct dma_chan *chan,
dst_maxburst = src_maxburst;

} else if (config->direction == DMA_MEM_TO_DEV) {
- dma_addr_t dev_addr_tx =
- d40c->base->plat_data->dev_tx[cfg->dev_type];
-
config_addr = config->dst_addr;
- if (dev_addr_tx)
- dev_dbg(d40c->base->dev,
- "channel has a pre-wired TX address %08x "
- "overriding with %08x\n",
- dev_addr_tx, config_addr);
+
if (cfg->dir != STEDMA40_MEM_TO_PERIPH)
dev_dbg(d40c->base->dev,
"channel was not configured for memory "
@@ -2833,6 +2799,11 @@ static int d40_set_runtime_config(struct dma_chan *chan,
return -EINVAL;
}

+ if (config_addr <= 0) {
+ dev_err(d40c->base->dev, "no address supplied\n");
+ return -EINVAL;
+ }
+
if (src_maxburst * src_addr_width != dst_maxburst * dst_addr_width) {
dev_err(d40c->base->dev,
"src/dst width/maxburst mismatch: %d*%d != %d*%d\n",
--
1.7.10.4


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