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Subject[PATCH v3 3/3] ufs-host: qcom: Add MCQ ESI config vendor specific ops
Date
Add MCQ ESI config vendor specific ops.

Co-developed-by: Asutosh Das <quic_asutoshd@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
---
drivers/ufs/host/ufs-qcom.c | 97 +++++++++++++++++++++++++++++++++++++++++++++
drivers/ufs/host/ufs-qcom.h | 5 +++
2 files changed, 102 insertions(+)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 96a58b4..ea5b5f7 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -1568,6 +1568,101 @@ static int ufs_qcom_get_outstanding_cqs(struct ufs_hba *hba,
return 0;
}

+#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
+static void ufs_qcom_write_msi_msg(struct msi_desc *desc, struct msi_msg *msg)
+{
+ struct device *dev = msi_desc_to_dev(desc);
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ ufshcd_mcq_config_esi(hba, msg);
+}
+
+static irqreturn_t ufs_qcom_mcq_esi_handler(int irq, void *__hba)
+{
+ struct ufs_hba *hba = __hba;
+ struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+ u32 id = irq - host->esi_base;
+ struct ufs_hw_queue *hwq = &hba->uhq[id];
+
+ ufshcd_mcq_write_cqis(hba, 0x1, id);
+ ufshcd_mcq_poll_cqe_nolock(hba, hwq);
+
+ return IRQ_HANDLED;
+}
+
+static int ufs_qcom_config_esi(struct ufs_hba *hba)
+{
+ struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+ struct msi_desc *desc;
+ struct msi_desc *failed_desc = NULL;
+ int nr_irqs, ret;
+
+ if (host->esi_enabled)
+ return 0;
+ else if (host->esi_base < 0)
+ return -EINVAL;
+
+ /*
+ * 1. We only handle CQs as of now.
+ * 2. Poll queues do not need ESI.
+ */
+ nr_irqs = hba->nr_hw_queues - hba->nr_queues[HCTX_TYPE_POLL];
+ ret = platform_msi_domain_alloc_irqs(hba->dev, nr_irqs,
+ ufs_qcom_write_msi_msg);
+ if (ret)
+ goto out;
+
+ msi_for_each_desc(desc, hba->dev, MSI_DESC_ALL) {
+ if (!desc->msi_index)
+ host->esi_base = desc->irq;
+
+ ret = devm_request_irq(hba->dev, desc->irq,
+ ufs_qcom_mcq_esi_handler,
+ IRQF_SHARED, "qcom-mcq-esi", hba);
+ if (ret) {
+ dev_err(hba->dev, "%s: Fail to request IRQ for %d, err = %d\n",
+ __func__, desc->irq, ret);
+ failed_desc = desc;
+ break;
+ }
+ }
+
+ if (ret) {
+ /* Rewind */
+ msi_for_each_desc(desc, hba->dev, MSI_DESC_ALL) {
+ if (desc == failed_desc)
+ break;
+ devm_free_irq(hba->dev, desc->irq, hba);
+ }
+ platform_msi_domain_free_irqs(hba->dev);
+ } else {
+ if (host->hw_ver.major == 6 && host->hw_ver.minor == 0 &&
+ host->hw_ver.step == 0) {
+ ufshcd_writel(hba,
+ ufshcd_readl(hba, REG_UFS_CFG3) | 0x1F000,
+ REG_UFS_CFG3);
+ }
+ ufshcd_mcq_enable_esi(hba);
+ }
+
+out:
+ if (ret) {
+ host->esi_base = -1;
+ dev_warn(hba->dev, "Failed to request Platform MSI %d\n", ret);
+ } else {
+ host->esi_enabled = true;
+ }
+
+ return ret;
+}
+
+#else
+static int ufs_qcom_config_esi(struct ufs_hba *hba)
+{
+ return -EOPNOTSUPP;
+}
+#endif
+
/*
* struct ufs_hba_qcom_vops - UFS QCOM specific variant operations
*
@@ -1595,6 +1690,7 @@ static const struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
.get_hba_mac = ufs_qcom_get_hba_mac,
.op_runtime_config = ufs_qcom_op_runtime_config,
.get_outstanding_cqs = ufs_qcom_get_outstanding_cqs,
+ .config_esi = ufs_qcom_config_esi,
};

/**
@@ -1628,6 +1724,7 @@ static int ufs_qcom_remove(struct platform_device *pdev)

pm_runtime_get_sync(&(pdev)->dev);
ufshcd_remove(hba);
+ platform_msi_domain_free_irqs(hba->dev);
return 0;
}

diff --git a/drivers/ufs/host/ufs-qcom.h b/drivers/ufs/host/ufs-qcom.h
index 6912bdf..7937b41 100644
--- a/drivers/ufs/host/ufs-qcom.h
+++ b/drivers/ufs/host/ufs-qcom.h
@@ -54,6 +54,8 @@ enum {
* added in HW Version 3.0.0
*/
UFS_AH8_CFG = 0xFC,
+
+ REG_UFS_CFG3 = 0x271C,
};

/* QCOM UFS host controller vendor specific debug registers */
@@ -226,6 +228,9 @@ struct ufs_qcom_host {
struct reset_controller_dev rcdev;

struct gpio_desc *device_reset;
+
+ int esi_base;
+ bool esi_enabled;
};

static inline u32
--
2.7.4
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