From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-pl1-x644.google.com ([2607:f8b0:4864:20::644]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fvbpU-0001BJ-4o for barebox@lists.infradead.org; Fri, 31 Aug 2018 05:18:45 +0000 Received: by mail-pl1-x644.google.com with SMTP id b12-v6so4892305plr.8 for ; Thu, 30 Aug 2018 22:18:33 -0700 (PDT) From: Andrey Smirnov Date: Thu, 30 Aug 2018 22:18:22 -0700 Message-Id: <20180831051826.13587-1-andrew.smirnov@gmail.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 1/5] driver: Adopt DMA mask concept from Linux To: barebox@lists.infradead.org Cc: Andrey Smirnov In order to be able to detect cases where DMA isn't capable of reaching every memory address, port the concept of DMA mask, dma_set_mask() function and add appropriate check to dma_mapping_error(). Signed-off-by: Andrey Smirnov --- include/dma.h | 12 +++++++++++- include/driver.h | 2 ++ 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/include/dma.h b/include/dma.h index 5fdcb1733..7f9578263 100644 --- a/include/dma.h +++ b/include/dma.h @@ -35,11 +35,21 @@ dma_addr_t dma_map_single(struct device_d *dev, void *ptr, size_t size, void dma_unmap_single(struct device_d *dev, dma_addr_t addr, size_t size, enum dma_data_direction dir); +#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) + +#define DMA_MASK_NONE 0x0ULL + +static inline void dma_set_mask(struct device_d *dev, u64 dma_mask) +{ + dev->dma_mask = dma_mask; +} + #define DMA_ERROR_CODE (~(dma_addr_t)0) static inline int dma_mapping_error(struct device_d *dev, dma_addr_t dma_addr) { - return dma_addr == DMA_ERROR_CODE; + return dma_addr == DMA_ERROR_CODE || + (dev->dma_mask && dma_addr > dev->dma_mask); } /* streaming DMA - implement the below calls to support HAS_DMA */ diff --git a/include/driver.h b/include/driver.h index 91653b794..1b61f2066 100644 --- a/include/driver.h +++ b/include/driver.h @@ -82,6 +82,8 @@ struct device_d { const struct of_device_id *of_id_entry; + u64 dma_mask; + void (*info) (struct device_d *); /* * For devices which take longer to probe this is called -- 2.17.1 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox