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From: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>
To: ulf.hansson@linaro.org, adrian.hunter@intel.com
Cc: asutoshd@codeaurora.org, stummala@codeaurora.org,
	sayalil@codeaurora.org, cang@codeaurora.org,
	rampraka@codeaurora.org, linux-mmc@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	Ritesh Harjani <riteshh@codeaurora.org>,
	Veerabhadrarao Badiganti <vbadigan@codeaurora.org>,
	Andy Gross <agross@kernel.org>, Andrew Jeffery <andrew@aj.id.au>,
	Faiz Abbas <faiz_abbas@ti.com>,
	Thierry Reding <treding@nvidia.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	"Enrico Weigelt, metux IT consult" <info@metux.net>,
	BOUGH CHEN <haibo.chen@nxp.com>,
	Takao Orito <orito.takao@socionext.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Subject: [PATCH V2 2/2] mmc: sdhci-msm: Add CQHCI support for sdhci-msm
Date: Thu, 16 Jan 2020 22:33:11 +0530
Message-ID: <1579194192-7942-3-git-send-email-vbadigan@codeaurora.org> (raw)
In-Reply-To: <1579194192-7942-1-git-send-email-vbadigan@codeaurora.org>

From: Ritesh Harjani <riteshh@codeaurora.org>

This adds CQHCI support for sdhci-msm platforms.

Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>
---
 drivers/mmc/host/Kconfig     |   1 +
 drivers/mmc/host/sdhci-msm.c | 133 ++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 133 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index d06b2df..7f2ae59 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -501,6 +501,7 @@ config MMC_SDHCI_MSM
 	depends on ARCH_QCOM || (ARM && COMPILE_TEST)
 	depends on MMC_SDHCI_PLTFM
 	select MMC_SDHCI_IO_ACCESSORS
+	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 3d0bb5e..0b4d01f 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -15,6 +15,7 @@
 #include <linux/regulator/consumer.h>
 
 #include "sdhci-pltfm.h"
+#include "cqhci.h"
 
 #define CORE_MCI_VERSION		0x50
 #define CORE_VERSION_MAJOR_SHIFT	28
@@ -122,6 +123,10 @@
 #define msm_host_writel(msm_host, val, host, offset) \
 	msm_host->var_ops->msm_writel_relaxed(val, host, offset)
 
+/* CQHCI vendor specific registers */
+#define CQHCI_VENDOR_CFG1	0xA00
+#define CQHCI_VENDOR_DIS_RST_ON_CQ_EN	(0x3 << 13)
+
 struct sdhci_msm_offset {
 	u32 core_hc_mode;
 	u32 core_mci_data_cnt;
@@ -1567,6 +1572,127 @@ 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;
+}
+
+void sdhci_msm_cqe_disable(struct mmc_host *mmc, bool recovery)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	unsigned long flags;
+	u32 ctrl;
+
+	/*
+	 * When CQE is halted, the legacy SDHCI path operates only
+	 * on 16-byte descriptors in 64bit mode.
+	 */
+	if (host->flags & SDHCI_USE_64_BIT_DMA)
+		host->desc_sz = 16;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	/*
+	 * During CQE command transfers, command complete bit gets latched.
+	 * So s/w should clear command complete interrupt status when CQE is
+	 * either halted or disabled. Otherwise unexpected SDCHI legacy
+	 * interrupt gets triggered when CQE is halted/disabled.
+	 */
+	ctrl = sdhci_readl(host, SDHCI_INT_ENABLE);
+	ctrl |= SDHCI_INT_RESPONSE;
+	sdhci_writel(host,  ctrl, SDHCI_INT_ENABLE);
+	sdhci_writel(host, SDHCI_INT_RESPONSE, SDHCI_INT_STATUS);
+
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	sdhci_cqe_disable(mmc, recovery);
+}
+
+static const struct cqhci_host_ops sdhci_msm_cqhci_ops = {
+	.enable		= sdhci_cqe_enable,
+	.disable	= sdhci_msm_cqe_disable,
+};
+
+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;
+	u32 cqcfg;
+	int ret;
+
+	/*
+	 * When CQE is halted, SDHC operates only on 16byte ADMA descriptors.
+	 * So ensure ADMA table is allocated for 16byte descriptors.
+	 */
+	if (host->caps & SDHCI_CAN_64BIT)
+		host->alloc_desc_sz = 16;
+
+	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 | MMC_CAP2_CQE_DCMD;
+	cq_host->ops = &sdhci_msm_cqhci_ops;
+
+	dma64 = host->flags & SDHCI_USE_64_BIT_DMA;
+
+	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;
+	}
+
+	/* Disable cqe reset due to cqe enable signal */
+	cqcfg = cqhci_readl(cq_host, CQHCI_VENDOR_CFG1);
+	cqcfg |= CQHCI_VENDOR_DIS_RST_ON_CQ_EN;
+	cqhci_writel(cq_host, cqcfg, CQHCI_VENDOR_CFG1);
+
+	/*
+	 * SDHC expects 12byte ADMA descriptors till CQE is enabled.
+	 * So limit desc_sz to 12 so that the data commands that are sent
+	 * during card initialization (before CQE gets enabled) would
+	 * get executed without any issues.
+	 */
+	if (host->flags & SDHCI_USE_64_BIT_DMA)
+		host->desc_sz = 12;
+
+	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;
+}
+
 /*
  * Platform specific register write functions. This is so that, if any
  * register write needs to be followed up by platform specific actions,
@@ -1731,6 +1857,7 @@ static void sdhci_msm_set_regulator_caps(struct sdhci_msm_host *msm_host)
 	.set_uhs_signaling = sdhci_msm_set_uhs_signaling,
 	.write_w = sdhci_msm_writew,
 	.write_b = sdhci_msm_writeb,
+	.irq	= sdhci_msm_cqe_irq,
 };
 
 static const struct sdhci_pltfm_data sdhci_msm_pdata = {
@@ -1754,6 +1881,7 @@ static int sdhci_msm_probe(struct platform_device *pdev)
 	u8 core_major;
 	const struct sdhci_msm_offset *msm_offset;
 	const struct sdhci_msm_variant_info *var_info;
+	struct device_node *node = pdev->dev.of_node;
 
 	host = sdhci_pltfm_init(pdev, &sdhci_msm_pdata, sizeof(*msm_host));
 	if (IS_ERR(host))
@@ -1952,7 +2080,10 @@ 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_property_read_bool(node, "supports-cqe"))
+		ret = sdhci_msm_cqe_add_host(host, pdev);
+	else
+		ret = sdhci_add_host(host);
 	if (ret)
 		goto pm_runtime_disable;
 	sdhci_msm_set_regulator_caps(msm_host);
-- 
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project

  parent reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-16 17:03 [PATCH V2 0/2] " Veerabhadrarao Badiganti
2020-01-16 17:03 ` [PATCH V2 1/2] mmc: sdhci: Let a vendor driver supply and update ADMA descriptor size Veerabhadrarao Badiganti
2020-01-20  8:58   ` Adrian Hunter
2020-01-20 11:17   ` Veerabhadrarao Badiganti
2020-01-20 12:29     ` Adrian Hunter
2020-01-20 12:30     ` Ulf Hansson
2020-01-20 14:38     ` [PATCH V3] " Veerabhadrarao Badiganti
2020-01-24 11:25       ` Ulf Hansson
2020-01-16 17:03 ` Veerabhadrarao Badiganti [this message]
2020-01-20  8:58   ` [PATCH V2 2/2] mmc: sdhci-msm: Add CQHCI support for sdhci-msm Adrian Hunter
2020-01-20 12:30   ` Ulf Hansson

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