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Subject[RFC 2/4] mmc: sdhci-msm: Add CQHCI support for sdhci-msm
Date
This adds CQHCI support for sdhci-msm platforms.

Signed-off-by: Ritesh Harjani <riteshh@codeaurora.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
+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;
+ 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;

--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
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