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| author | Ahmad Fatoum <a.fatoum@pengutronix.de> | 2022-06-14 11:15:56 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2022-06-17 08:25:43 +0200 |
| commit | e31495eeb3a9e179a736e67012b17cc4a7bfc10b (patch) | |
| tree | fef12e158bd416c580e0faa8375f31e80b767407 | |
| parent | c50731ebca48c6216b183bd1e0272dd75033ba41 (diff) | |
| download | barebox-e31495eeb3a9e179a736e67012b17cc4a7bfc10b.tar.gz barebox-e31495eeb3a9e179a736e67012b17cc4a7bfc10b.tar.xz | |
dma: add dma_sync nop stubs for PBL
We can implement dma_sync functions as compiler barriers when we are
certain that the buffers are in coherent/uncached memory, e.g. because
MMU is only enabled in barebox_arm_entry which hasn't run yet.
This will come in handy when doing mailbox communication in PBL on the
Raspberry Pi.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20220614091556.1018102-2-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
| -rw-r--r-- | include/dma.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/include/dma.h b/include/dma.h index 2a271044f6..2c4bdfc98f 100644 --- a/include/dma.h +++ b/include/dma.h @@ -56,6 +56,7 @@ static inline int dma_mapping_error(struct device_d *dev, dma_addr_t dma_addr) (dev->dma_mask && dma_addr > dev->dma_mask); } +#ifndef __PBL__ /* streaming DMA - implement the below calls to support HAS_DMA */ #ifndef dma_sync_single_for_cpu void dma_sync_single_for_cpu(dma_addr_t address, size_t size, @@ -66,6 +67,27 @@ void dma_sync_single_for_cpu(dma_addr_t address, size_t size, void dma_sync_single_for_device(dma_addr_t address, size_t size, enum dma_data_direction dir); #endif +#else +#ifndef dma_sync_single_for_cpu +/* + * assumes buffers are in coherent/uncached memory, e.g. because + * MMU is only enabled in barebox_arm_entry which hasn't run yet. + */ +static inline void dma_sync_single_for_cpu(dma_addr_t address, size_t size, + enum dma_data_direction dir) +{ + barrier_data((void *)address); +} +#endif + +#ifndef dma_sync_single_for_device +static inline void dma_sync_single_for_device(dma_addr_t address, size_t size, + enum dma_data_direction dir) +{ + barrier_data((void *)address); +} +#endif +#endif #ifndef dma_alloc_coherent void *dma_alloc_coherent(size_t size, dma_addr_t *dma_handle); |