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Message-ID: <a7310800-fb8a-eb56-10f5-93c89f141d9c@intel.com>
Date: Thu, 31 Aug 2017 10:25:51 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Ritesh Harjani <riteshh@...eaurora.org>, ulf.hansson@...aro.org
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
stummala@...eaurora.org, asutoshd@...eaurora.org
Subject: Re: [RFC 2/4] mmc: sdhci-msm: Add CQHCI support for sdhci-msm
On 30/08/17 16:04, Ritesh Harjani wrote:
> This adds CQHCI support for sdhci-msm platforms.
>
> Signed-off-by: Ritesh Harjani <riteshh@...eaurora.org>
> ---
> .../devicetree/bindings/mmc/sdhci-msm.txt | 1 +
> drivers/mmc/host/Kconfig | 1 +
> drivers/mmc/host/sdhci-msm.c | 90 +++++++++++++++++++++-
> 3 files changed, 91 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
> index 0576264..897294f 100644
> --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
> +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
> @@ -5,6 +5,7 @@ and the properties used by the sdhci-msm driver.
>
> Required properties:
> - compatible: Should contain "qcom,sdhci-msm-v4".
> +- compatible: "qcom,sdhci-msm-cqe" - Optional in case the controller support CQE.
> - reg: Base address and length of the register in the following order:
> - Host controller register map (required)
> - SD Core register map (required)
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index b8c9ea5..a2524c7 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -430,6 +430,7 @@ config MMC_SDHCI_MSM
> tristate "Qualcomm SDHCI Controller Support"
> depends on ARCH_QCOM || (ARM && COMPILE_TEST)
> depends on MMC_SDHCI_PLTFM
> + select MMC_CQHCI
> help
> This selects the Secure Digital Host Controller Interface (SDHCI)
> support present in Qualcomm SOCs. The controller supports
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index df66724..346cdfb 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -23,6 +23,7 @@
> #include <linux/iopoll.h>
>
> #include "sdhci-pltfm.h"
> +#include "cqhci.h"
>
> #define CORE_MCI_VERSION 0x50
> #define CORE_VERSION_MAJOR_SHIFT 28
> @@ -1092,8 +1093,87 @@ static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
> __sdhci_msm_set_clock(host, clock);
> }
>
> +/*****************************************************************************\
> + * *
> + * MSM Command Queue Engine (CQE) *
> + * *
> +\*****************************************************************************/
> +
> +static u32 sdhci_msm_cqe_irq(struct sdhci_host *host, u32 intmask)
> +{
> + int cmd_error = 0;
> + int data_error = 0;
> +
> + if (!sdhci_cqe_irq(host, intmask, &cmd_error, &data_error))
> + return intmask;
> +
> + cqhci_irq(host->mmc, intmask, cmd_error, data_error);
> + return 0;
> +}
> +
> +static const struct cqhci_host_ops sdhci_msm_cqhci_ops = {
> + .enable = sdhci_cqe_enable,
> + .disable = sdhci_cqe_disable,
> +};
> +
> +#ifdef CONFIG_MMC_CQHCI
If you select MMC_CQHCI then this #ifdef is not needed
> +static int sdhci_msm_cqe_add_host(struct sdhci_host *host,
> + struct platform_device *pdev)
> +{
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> + struct cqhci_host *cq_host;
> + bool dma64;
> + int ret;
> +
> + ret = sdhci_setup_host(host);
> + if (ret)
> + return ret;
> +
> + cq_host = cqhci_pltfm_init(pdev);
> + if (IS_ERR(cq_host)) {
> + ret = PTR_ERR(cq_host);
> + dev_err(&pdev->dev, "cqhci-pltfm init: failed: %d\n", ret);
> + goto cleanup;
> + }
> +
> + msm_host->mmc->caps2 |= MMC_CAP2_CQE;
If DCMD works you need MMC_CAP2_CQE_DCMD also
> + cq_host->ops = &sdhci_msm_cqhci_ops;
> +
> + dma64 = host->flags & SDHCI_USE_64_BIT_DMA;
> + if (dma64)
> + cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
> +
> + ret = cqhci_init(cq_host, host->mmc, dma64);
> + if (ret) {
> + dev_err(&pdev->dev, "%s: CQE init: failed (%d)\n", mmc_hostname(host->mmc),
> + ret);
> + goto cleanup;
> + }
> +
> + ret = __sdhci_add_host(host);
> + if (ret)
> + goto cleanup;
> +
> + dev_info(&pdev->dev, "%s: CQE init: success\n", mmc_hostname(host->mmc));
> + return ret;
> +
> +cleanup:
> + sdhci_cleanup_host(host);
> + return ret;
> +}
> +#else
> +static void sdhci_msm_cqe_add_host(struct sdhci_host *host,
> + struct platform_device *pdev)
> +{
> + dev_warn(&pdev->dev, "CQE config not enabled, defaulting to sdhci\n");
> + return sdhci_add_host(host);
> +}
> +#endif /* CONFIG_MMC_CQHCI */
> +
> static const struct of_device_id sdhci_msm_dt_match[] = {
> { .compatible = "qcom,sdhci-msm-v4" },
> + { .compatible = "qcom,sdhci-msm-cqe" },
> {},
> };
>
> @@ -1107,6 +1187,7 @@ static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
> .set_bus_width = sdhci_set_bus_width,
> .set_uhs_signaling = sdhci_msm_set_uhs_signaling,
> .voltage_switch = sdhci_msm_voltage_switch,
> + .irq = sdhci_msm_cqe_irq,
> };
>
> static const struct sdhci_pltfm_data sdhci_msm_pdata = {
> @@ -1125,6 +1206,7 @@ static int sdhci_msm_probe(struct platform_device *pdev)
> struct sdhci_pltfm_host *pltfm_host;
> struct sdhci_msm_host *msm_host;
> struct resource *core_memres;
> + struct device_node *node = pdev->dev.of_node;
> int ret;
> u16 host_version, core_minor;
> u32 core_version, config;
> @@ -1277,7 +1359,13 @@ static int sdhci_msm_probe(struct platform_device *pdev)
> pm_runtime_use_autosuspend(&pdev->dev);
>
> host->mmc_host_ops.execute_tuning = sdhci_msm_execute_tuning;
> - ret = sdhci_add_host(host);
> +
> + if (of_device_is_compatible(node, "qcom,sdhci-msm-cqe")) {
> + dev_dbg(&pdev->dev, "node with qcom,sdhci-msm-cqe\n");
> + ret = sdhci_msm_cqe_add_host(host, pdev);
> + } else {
> + ret = sdhci_add_host(host);
> + }
> if (ret)
> goto pm_runtime_disable;
>
>
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