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Message-ID: <561C1391.2000802@gmail.com>
Date: Mon, 12 Oct 2015 22:09:53 +0200
From: Maxime Coquelin <mcoquelin.stm32@...il.com>
To: M'boumba Cedric Madianga <cedric.madianga@...il.com>,
robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
linux@....linux.org.uk, vinod.koul@...el.com,
linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Subject: Re: [PATCH 2/4] dmaengine: Add STM32 DMA driver
Hi Cedric,
On 10/08/2015 05:20 PM, M'boumba Cedric Madianga wrote:
> This patch adds support for the STM32 DMA controller.
>
> Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@...il.com>
> ---
> drivers/dma/Kconfig | 12 +
> drivers/dma/Makefile | 1 +
> drivers/dma/stm32-dma.c | 1193 +++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 1206 insertions(+)
> create mode 100644 drivers/dma/stm32-dma.c
>
> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
> index 5c931d4..4c6b37b 100644
> --- a/drivers/dma/Kconfig
> +++ b/drivers/dma/Kconfig
> @@ -431,6 +431,18 @@ config STE_DMA40
> help
> Support for ST-Ericsson DMA40 controller
>
> +config STM32_DMA
> + tristate "STMicroelectronics STM32 dma support"
s/dma/DMA/ ?
> diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
> new file mode 100644
> index 0000000..9814ca5
> --- /dev/null
> +++ b/drivers/dma/stm32-dma.c
> @@ -0,0 +1,1193 @@
> +#define STM32_DMA_LISR 0x0000 /* DMA Low Int Status Reg */
> +#define STM32_DMA_HISR 0x0004 /* DMA High Int Status Reg */
> +#define STM32_DMA_LIFCR 0x0008 /* DMA Low Int Flag Clear Reg */
> +#define STM32_DMA_HIFCR 0x000C /* DMA High Int Flag Clear Reg */
We usually use lower case for numerical values.
> +static int stm32_dma_set_xfer_param(struct stm32_dma_chan *chan,
> + enum dma_transfer_direction direction,
> + enum dma_slave_buswidth *buswidth)
> +{
> + enum dma_slave_buswidth src_addr_width, dst_addr_width;
> + u32 src_bus_width, dst_bus_width, src_burst_size, dst_burst_size;
> + u32 src_maxburst, dst_maxburst;
> + dma_addr_t src_addr, dst_addr;
> +
> + src_addr_width = chan->dma_sconfig.src_addr_width;
> + dst_addr_width = chan->dma_sconfig.dst_addr_width;
> + src_maxburst = chan->dma_sconfig.src_maxburst;
> + dst_maxburst = chan->dma_sconfig.dst_maxburst;
> + src_addr = chan->dma_sconfig.src_addr;
> + dst_addr = chan->dma_sconfig.dst_addr;
> +
> + switch (direction) {
> + case DMA_MEM_TO_DEV:
> + dst_bus_width = stm32_get_dma_width(chan, dst_addr_width);
> + if (dst_bus_width < 0)
> + return -EINVAL;
dst_bus_width is a u32, so cannot be negative.
Also, you should propagate de error returned by stm32_get_dma_width().
The comment also applies below:
> + dst_burst_size = stm32_get_dma_burst(chan, dst_maxburst);
> + if (dst_burst_size < 0)
> + return -EINVAL;
> + if (!src_addr_width)
> + src_addr_width = dst_addr_width;
> + src_bus_width = stm32_get_dma_width(chan, src_addr_width);
> + if (src_bus_width < 0)
> + return -EINVAL;
> + src_burst_size = stm32_get_dma_burst(chan, src_maxburst);
> + if (src_burst_size < 0)
> + return -EINVAL;
> +
> + chan->chan_reg.dma_scr |= (chan->chan_reg.dma_scr &
> + ~(STM32_DMA_SCR_DIR_MASK | STM32_DMA_SCR_PSIZE_MASK |
> + STM32_DMA_SCR_MSIZE_MASK | STM32_DMA_SCR_PBURST_MASK |
> + STM32_DMA_SCR_MBURST_MASK)) |
> + STM32_DMA_SCR_DIR(STM32_DMA_MEM_TO_DEV) |
> + STM32_DMA_SCR_PSIZE(dst_bus_width) |
> + STM32_DMA_SCR_MSIZE(src_bus_width) |
> + STM32_DMA_SCR_PBURST(dst_burst_size) |
> + STM32_DMA_SCR_MBURST(src_burst_size);
> +
> + chan->chan_reg.dma_spar = chan->dma_sconfig.dst_addr;
> + *buswidth = dst_addr_width;
> + return 0;
> +
> + case DMA_DEV_TO_MEM:
> + src_bus_width = stm32_get_dma_width(chan, src_addr_width);
> + if (src_bus_width < 0)
> + return -EINVAL;
> + src_burst_size = stm32_get_dma_burst(chan, src_maxburst);
> + if (src_burst_size < 0)
> + return -EINVAL;
> + if (!dst_addr_width)
> + dst_addr_width = src_addr_width;
> + dst_bus_width = stm32_get_dma_width(chan, dst_addr_width);
> + if (dst_bus_width < 0)
> + return -EINVAL;
> + dst_burst_size = stm32_get_dma_burst(chan, dst_maxburst);
> + if (dst_burst_size < 0)
> + return -EINVAL;
> +
> + chan->chan_reg.dma_scr |= (chan->chan_reg.dma_scr &
> + ~(STM32_DMA_SCR_DIR_MASK | STM32_DMA_SCR_PSIZE_MASK |
> + STM32_DMA_SCR_MSIZE_MASK | STM32_DMA_SCR_PBURST_MASK |
> + STM32_DMA_SCR_MBURST_MASK)) |
> + STM32_DMA_SCR_DIR(STM32_DMA_DEV_TO_MEM) |
> + STM32_DMA_SCR_PSIZE(src_bus_width) |
> + STM32_DMA_SCR_MSIZE(dst_bus_width) |
> + STM32_DMA_SCR_PBURST(src_burst_size) |
> + STM32_DMA_SCR_MBURST(dst_burst_size);
> + chan->chan_reg.dma_spar = chan->dma_sconfig.src_addr;
> + *buswidth = chan->dma_sconfig.src_addr_width;
> + return 0;
> +
> + default:
> + dev_err(chan2dev(chan), "Dma direction is not supported\n");
> + return -EINVAL;
> + }
> +
> + return -EINVAL;
> +}
Thanks,
Maxime
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