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dmaengine: ste_dma40: physical channels number correction

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DMAC_ICFG[0:2]=SCHNB only allows to count 'multiple of 4' physical
channels so it was ok with platforms having 8 channels but cannot be
used for next versions (with 10 or 14 channels).  This patch allows to
provide the number of physical channels for a DMA device via
platform_data, or still rely on SCHNB if platform_data announces 0
channel.

Signed-off-by: Gerald Baeza <gerald.baeza@stericsson.com>
Reviewed-by: Per Forlin <per.forlin@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>
This commit is contained in:
Gerald Baeza
2012-09-21 21:21:37 +02:00
committed by Fabio Baltieri
parent f000df8c5a
commit 47db92f4a6
2 changed files with 15 additions and 6 deletions
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4
include/linux/platform_data/dma-ste-dma40.h
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@@ -147,6 +147,9 @@ struct stedma40_chan_cfg {
* @memcpy_conf_log: default configuration of logical channel memcpy
* @disabled_channels: A vector, ending with -1, that marks physical channels
* that are for different reasons not available for the driver.
* @num_of_phy_chans: The number of physical channels implemented in HW.
* 0 means reading the number of channels from DMA HW but this is only valid
* for 'multiple of 4' channels, like 8.
*/
struct stedma40_platform_data {
u32 dev_len;
@@ -158,6 +161,7 @@ struct stedma40_platform_data {
struct stedma40_chan_cfg *memcpy_conf_log;
int disabled_channels[STEDMA40_MAX_PHYS];
bool use_esram_lcla;
int num_of_phy_chans;
};
#ifdef CONFIG_STE_DMA40