diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/dma-mapping.h | 63 | ||||
| -rw-r--r-- | include/mmc.h | 6 | ||||
| -rw-r--r-- | include/sdhci.h | 3 |
3 files changed, 72 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h new file mode 100644 index 00000000000..20b6d60dd88 --- /dev/null +++ b/include/linux/dma-mapping.h @@ -0,0 +1,63 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_DMA_MAPPING_H +#define _LINUX_DMA_MAPPING_H + +#include <linux/dma-direction.h> +#include <linux/types.h> +#include <asm/dma-mapping.h> +#include <cpu_func.h> + +#define dma_mapping_error(x, y) 0 + +/** + * Map a buffer to make it available to the DMA device + * + * Linux-like DMA API that is intended to be used from drivers. This hides the + * underlying cache operation from drivers. Call this before starting the DMA + * transfer. In most of architectures in U-Boot, the virtual address matches to + * the physical address (but we have exceptions like sandbox). U-Boot does not + * support iommu at the driver level, so it also matches to the DMA address. + * Hence, this helper currently just performs the cache operation, then returns + * straight-mapped dma_address, which is intended to be set to the register of + * the DMA device. + * + * @vaddr: address of the buffer + * @len: length of the buffer + * @dir: the direction of DMA + */ +static inline dma_addr_t dma_map_single(void *vaddr, size_t len, + enum dma_data_direction dir) +{ + unsigned long addr = (unsigned long)vaddr; + + len = ALIGN(len, ARCH_DMA_MINALIGN); + + if (dir == DMA_FROM_DEVICE) + invalidate_dcache_range(addr, addr + len); + else + flush_dcache_range(addr, addr + len); + + return addr; +} + +/** + * Unmap a buffer to make it available to CPU + * + * Linux-like DMA API that is intended to be used from drivers. This hides the + * underlying cache operation from drivers. Call this after finishin the DMA + * transfer. + * + * @addr: DMA address + * @len: length of the buffer + * @dir: the direction of DMA + */ +static inline void dma_unmap_single(dma_addr_t addr, size_t len, + enum dma_data_direction dir) +{ + len = ALIGN(len, ARCH_DMA_MINALIGN); + + if (dir != DMA_TO_DEVICE) + invalidate_dcache_range(addr, addr + len); +} + +#endif diff --git a/include/mmc.h b/include/mmc.h index b5cb514f57d..71e2e1735ad 100644 --- a/include/mmc.h +++ b/include/mmc.h @@ -12,6 +12,7 @@ #include <linux/list.h> #include <linux/sizes.h> #include <linux/compiler.h> +#include <linux/dma-direction.h> #include <part.h> #if CONFIG_IS_ENABLED(MMC_HS200_SUPPORT) @@ -880,4 +881,9 @@ int mmc_get_env_dev(void); */ struct blk_desc *mmc_get_blk_desc(struct mmc *mmc); +static inline enum dma_data_direction mmc_get_dma_dir(struct mmc_data *data) +{ + return data->flags & MMC_DATA_WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE; +} + #endif /* _MMC_H_ */ diff --git a/include/sdhci.h b/include/sdhci.h index 01addb7a603..7f8feefa450 100644 --- a/include/sdhci.h +++ b/include/sdhci.h @@ -9,6 +9,7 @@ #ifndef __SDHCI_HW_H #define __SDHCI_HW_H +#include <linux/types.h> #include <asm/io.h> #include <mmc.h> #include <asm/gpio.h> @@ -321,6 +322,8 @@ struct sdhci_host { uint voltages; struct mmc_config cfg; + void *align_buffer; + bool force_align_buffer; dma_addr_t start_addr; int flags; #define USE_SDMA (0x1 << 0) |