Re: [RFC PATCH v4 1/9] mmc: dw_mmc: Add external dma interface support

Krzysztof Kozlowski
2015-08-06T07:08:15Z

On 06.08.2015 15:44, Shawn Lin wrote:
> DesignWare MMC Controller can supports two types of DMA
> mode: external dma and internal dma. We get a RK312x platform
> integrated dw_mmc and ARM pl330 dma controller. This patch add
> edmac ops to support these platforms. I've tested it on RK312x
> platform with edmac mode and RK3288 platform with idmac mode.
>
> Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
>
> ---
>
> Changes in v4:
> - remove "host->trans_mode" and use "host->use_dma" to indicate
> transfer mode.
> - remove all bt-bindings' changes since we don't need new properities.
> - check transfer mode at runtime by reading HCON reg
> - spilt defconfig changes for each sub-architecture
> - fix the title of cover letter

How did you fixed the title? It is still empty :)
Subject: [RFC PATCH v4 0/9]

> - reuse some code for reducing code size
>
> Changes in v3:
> - choose transfer mode at runtime
> - remove all CONFIG_MMC_DW_IDMAC config option
> - add supports-idmac property for some platforms
>
> Changes in v2:
> - Fix typo of dev_info msg
> - remove unused dmach from declaration of dw_mci_dma_slave
>
> drivers/mmc/host/Kconfig | 11 +-
> drivers/mmc/host/dw_mmc-pltfm.c | 2 +
> drivers/mmc/host/dw_mmc.c | 258 ++++++++++++++++++++++++++++++++--------
> include/linux/mmc/dw_mmc.h | 27 ++++-
> 4 files changed, 232 insertions(+), 66 deletions(-)
>
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 6a0f9c7..a86c0eb 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -607,15 +607,7 @@ config MMC_DW
> help
> This selects support for the Synopsys DesignWare Mobile Storage IP
> block, this provides host support for SD and MMC interfaces, in both
> - PIO and external DMA modes.
> -
> -config MMC_DW_IDMAC
> - bool "Internal DMAC interface"
> - depends on MMC_DW
> - help
> - This selects support for the internal DMAC block within the Synopsys
> - Designware Mobile Storage IP block. This disables the external DMA
> - interface.
> + PIO, internal DMA mode and external DMA modes.
>
> config MMC_DW_PLTFM
> tristate "Synopsys Designware MCI Support as platform device"
> @@ -644,7 +636,6 @@ config MMC_DW_K3
> tristate "K3 specific extensions for Synopsys DW Memory Card Interface"
> depends on MMC_DW
> select MMC_DW_PLTFM
> - select MMC_DW_IDMAC
> help
> This selects support for Hisilicon K3 SoC specific extensions to the
> Synopsys DesignWare Memory Card Interface driver. Select this option
> diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c
> index ec6dbcd..7e1d13b 100644
> --- a/drivers/mmc/host/dw_mmc-pltfm.c
> +++ b/drivers/mmc/host/dw_mmc-pltfm.c
> @@ -59,6 +59,8 @@ int dw_mci_pltfm_register(struct platform_device *pdev,
> host->pdata = pdev->dev.platform_data;
>
> regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + /* Get registers' physical base address */
> + host->phy_regs = (void *)(regs->start);
> host->regs = devm_ioremap_resource(&pdev->dev, regs);
> if (IS_ERR(host->regs))
> return PTR_ERR(host->regs);
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 40e9d8e..5d6cdff 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -56,7 +56,7 @@
> #define DW_MCI_FREQ_MAX 200000000 /* unit: HZ */
> #define DW_MCI_FREQ_MIN 400000 /* unit: HZ */
>
> -#ifdef CONFIG_MMC_DW_IDMAC
> +
> #define IDMAC_INT_CLR (SDMMC_IDMAC_INT_AI | SDMMC_IDMAC_INT_NI | \
> SDMMC_IDMAC_INT_CES | SDMMC_IDMAC_INT_DU | \
> SDMMC_IDMAC_INT_FBE | SDMMC_IDMAC_INT_RI | \
> @@ -99,7 +99,6 @@ struct idmac_desc {
>
> __le32 des3; /* buffer 2 physical address */
> };
> -#endif /* CONFIG_MMC_DW_IDMAC */
>
> static bool dw_mci_reset(struct dw_mci *host);
> static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset);
> @@ -403,7 +402,6 @@ static int dw_mci_get_dma_dir(struct mmc_data *data)
> return DMA_FROM_DEVICE;
> }
>
> -#ifdef CONFIG_MMC_DW_IDMAC
> static void dw_mci_dma_cleanup(struct dw_mci *host)
> {
> struct mmc_data *data = host->data;
> @@ -441,12 +439,21 @@ static void dw_mci_idmac_stop_dma(struct dw_mci *host)
> mci_writel(host, BMOD, temp);
> }
>
> -static void dw_mci_idmac_complete_dma(struct dw_mci *host)
> +static void dw_mci_dmac_complete_dma(void *arg)
> {
> + struct dw_mci *host = arg;

Why changing the argument to void*?

Best regards,
Krzysztof

> struct mmc_data *data = host->data;
>
> dev_vdbg(host->dev, "DMA complete\n");
>
> + if (host->use_dma == TRANS_MODE_EDMAC)
> + if (data && (data->flags & MMC_DATA_READ))
> + /* Invalidate cache after read */
> + dma_sync_sg_for_cpu(mmc_dev(host->cur_slot->mmc),
> + data->sg,
> + data->sg_len,
> + DMA_FROM_DEVICE);
> +
> host->dma_ops->cleanup(host);