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brcmfmac: add broken scatter-gather DMA support

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DMA engine of some old SDIO host controllers require block size alignment for
data length of each scatterlist item. This patch introduces an intermediate
buffer list to support this kind of platform. It decreases the throughput
because of an extra memcpy in critical data path. So don't turn this on unless
it's necessary.

Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Franky Lin
2013-06-26 14:20:18 +02:00
committed by John W. Linville
parent 356bae6fb7
commit 3b81a68094
2 changed files with 72 additions and 11 deletions
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5
include/linux/platform_data/brcmfmac-sdio.h
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@@ -90,6 +90,10 @@ void __init brcmfmac_init_pdata(void)
* oob_irq_nr, oob_irq_flags: the OOB interrupt information. The values are
* used for registering the irq using request_irq function.
*
* broken_sg_support: flag for broken sg list support of SDIO host controller.
* Set this to true if the SDIO host controller has higher align requirement
* than 32 bytes for each scatterlist item.
*
* power_on: This function is called by the brcmfmac when the module gets
* loaded. This can be particularly useful for low power devices. The platform
* spcific routine may for example decide to power up the complete device.
@@ -116,6 +120,7 @@ struct brcmfmac_sdio_platform_data {
bool oob_irq_supported;
unsigned int oob_irq_nr;
unsigned long oob_irq_flags;
bool broken_sg_support;
void (*power_on)(void);
void (*power_off)(void);
void (*reset)(void);