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dmaengine/ste_dma40: allow fixed physical channel

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Allow logical channels to specify the physical channel they want to use.
This is needed to avoid two peripherals operating on the same physical
channel during some special use-cases. (like mmc and usb during a
usb mass storage case).

Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Narayanan G <narayanan.gopalakrishnan@stericsson.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
This commit is contained in:
Narayanan G 2011-11-30 19:20:42 +05:30 committed by Vinod Koul
parent 8f0d30f9ee
commit 5cd326fd27
2 changed files with 47 additions and 10 deletions
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6
arch/arm/plat-nomadik/include/plat/ste_dma40.h
View File

@ -113,7 +113,8 @@ struct stedma40_half_channel_info {
* @dst_dev_type: Dst device type
* @src_info: Parameters for dst half channel
* @dst_info: Parameters for dst half channel
*
* @use_fixed_channel: if true, use physical channel specified by phy_channel
* @phy_channel: physical channel to use, only if use_fixed_channel is true
*
* This structure has to be filled by the client drivers.
* It is recommended to do all dma configurations for clients in the machine.
@ -129,6 +130,9 @@ struct stedma40_chan_cfg {
int dst_dev_type;
struct stedma40_half_channel_info src_info;
struct stedma40_half_channel_info dst_info;
bool use_fixed_channel;
int phy_channel;
};
/**

51
drivers/dma/ste_dma40.c
View File

@ -1545,11 +1545,16 @@ static int d40_validate_conf(struct d40_chan *d40c,
return res;
}
static bool d40_alloc_mask_set(struct d40_phy_res *phy, bool is_src,
int log_event_line, bool is_log)
static bool d40_alloc_mask_set(struct d40_phy_res *phy,
bool is_src, int log_event_line, bool is_log,
bool *first_user)
{
unsigned long flags;
spin_lock_irqsave(&phy->lock, flags);
*first_user = ((phy->allocated_src | phy->allocated_dst)
== D40_ALLOC_FREE);
if (!is_log) {
/* Physical interrupts are masked per physical full channel */
if (phy->allocated_src == D40_ALLOC_FREE &&
@ -1630,7 +1635,7 @@ static bool d40_alloc_mask_free(struct d40_phy_res *phy, bool is_src,
return is_free;
}
static int d40_allocate_channel(struct d40_chan *d40c)
static int d40_allocate_channel(struct d40_chan *d40c, bool *first_phy_user)
{
int dev_type;
int event_group;
@ -1666,7 +1671,8 @@ static int d40_allocate_channel(struct d40_chan *d40c)
for (i = 0; i < d40c->base->num_phy_chans; i++) {
if (d40_alloc_mask_set(&phys[i], is_src,
0, is_log))
0, is_log,
first_phy_user))
goto found_phy;
}
} else
@ -1676,7 +1682,8 @@ static int d40_allocate_channel(struct d40_chan *d40c)
if (d40_alloc_mask_set(&phys[i],
is_src,
0,
is_log))
is_log,
first_phy_user))
goto found_phy;
}
}
@ -1692,6 +1699,25 @@ static int d40_allocate_channel(struct d40_chan *d40c)
/* Find logical channel */
for (j = 0; j < d40c->base->num_phy_chans; j += 8) {
int phy_num = j + event_group * 2;
if (d40c->dma_cfg.use_fixed_channel) {
i = d40c->dma_cfg.phy_channel;
if ((i != phy_num) && (i != phy_num + 1)) {
dev_err(chan2dev(d40c),
"invalid fixed phy channel %d\n", i);
return -EINVAL;
}
if (d40_alloc_mask_set(&phys[i], is_src, event_line,
is_log, first_phy_user))
goto found_log;
dev_err(chan2dev(d40c),
"could not allocate fixed phy channel %d\n", i);
return -EINVAL;
}
/*
* Spread logical channels across all available physical rather
* than pack every logical channel at the first available phy
@ -1700,13 +1726,15 @@ static int d40_allocate_channel(struct d40_chan *d40c)
if (is_src) {
for (i = phy_num; i < phy_num + 2; i++) {
if (d40_alloc_mask_set(&phys[i], is_src,
event_line, is_log))
event_line, is_log,
first_phy_user))
goto found_log;
}
} else {
for (i = phy_num + 1; i >= phy_num; i--) {
if (d40_alloc_mask_set(&phys[i], is_src,
event_line, is_log))
event_line, is_log,
first_phy_user))
goto found_log;
}
}
@ -2160,9 +2188,8 @@ static int d40_alloc_chan_resources(struct dma_chan *chan)
goto fail;
}
}
is_free_phy = (d40c->phy_chan == NULL);
err = d40_allocate_channel(d40c);
err = d40_allocate_channel(d40c, &is_free_phy);
if (err) {
chan_err(d40c, "Failed to allocate channel\n");
d40c->configured = false;
@ -2189,6 +2216,12 @@ static int d40_alloc_chan_resources(struct dma_chan *chan)
D40_LCPA_CHAN_SIZE + D40_LCPA_CHAN_DST_DELTA;
}
dev_dbg(chan2dev(d40c), "allocated %s channel (phy %d%s)\n",
chan_is_logical(d40c) ? "logical" : "physical",
d40c->phy_chan->num,
d40c->dma_cfg.use_fixed_channel ? ", fixed" : "");
/*
* Only write channel configuration to the DMA if the physical
* resource is free. In case of multiple logical channels