[PATCH v2 3/3] scsi: ufs: ufs-mediatek: Add MCQ support for MTK platform

[Po-Wen Kao]

Changes
- Implement vops and setup irq
- Fix pm flow under mcq mode

Signed-off-by: Po-Wen Kao <powen.kao@xxxxxxxxxxxx>
Signed-off-by: Peter Wang <peter.wang@xxxxxxxxxxxx>
---
 drivers/ufs/host/ufs-mediatek.c | 188 +++++++++++++++++++++++++++++++-
 drivers/ufs/host/ufs-mediatek.h |  33 ++++++
 2 files changed, 219 insertions(+), 2 deletions(-)

diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index a054810e321d..c0bc9ebf0830 100644
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -27,8 +27,14 @@
 #include <ufs/unipro.h>
 #include "ufs-mediatek.h"

+static int  ufs_mtk_config_mcq(struct ufs_hba *hba, bool irq);
+
 #define CREATE_TRACE_POINTS
 #include "ufs-mediatek-trace.h"
+#undef CREATE_TRACE_POINTS
+
+#define MAX_SUPP_MAC 64
+#define MCQ_QUEUE_OFFSET(c) ((((c) >> 16) & 0xFF) * 0x200)

 static const struct ufs_dev_quirk ufs_mtk_dev_fixups[] = {
 	{ .wmanufacturerid = UFS_ANY_VENDOR,
@@ -840,6 +846,37 @@ static void ufs_mtk_vreg_fix_vccqx(struct ufs_hba *hba)
 	}
 }

+static void ufs_mtk_init_mcq_irq(struct ufs_hba *hba)
+{
+	struct ufs_mtk_host *host = ufshcd_get_variant(hba);
+	struct platform_device *pdev;
+	int i;
+	int irq;
+
+	host->mcq_nr_intr = UFSHCD_MAX_Q_NR;
+	pdev = container_of(hba->dev, struct platform_device, dev);
+
+	/* invalidate irq info */
+	for (i = 0; i < host->mcq_nr_intr; i++)
+		host->mcq_intr_info[i].irq = MTK_MCQ_INVALID_IRQ;
+
+	for (i = 0; i < host->mcq_nr_intr; i++) {
+		/* irq index 0 is legacy irq, sq/cq irq start from index 1 */
+		irq = platform_get_irq(pdev, i + 1);
+		if (irq < 0) {
+			dev_err(hba->dev, "get platform mcq irq fail: %d\n", i);
+			goto failed;
+		}
+		host->mcq_intr_info[i].hba = hba;
+		host->mcq_intr_info[i].irq = irq;
+		dev_info(hba->dev, "get platform mcq irq: %d, %d\n", i, irq);
+	}
+
+	return;
+failed:
+	host->mcq_nr_intr = 0;
+}
+
 /**
  * ufs_mtk_init - find other essential mmio bases
  * @hba: host controller instance
@@ -876,6 +913,8 @@ static int ufs_mtk_init(struct ufs_hba *hba)
 	/* Initialize host capability */
 	ufs_mtk_init_host_caps(hba);

+	ufs_mtk_init_mcq_irq(hba);
+
 	err = ufs_mtk_bind_mphy(hba);
 	if (err)
 		goto out_variant_clear;
@@ -1171,7 +1210,16 @@ static int ufs_mtk_link_set_hpm(struct ufs_hba *hba)
 	else
 		return err;

-	err = ufshcd_make_hba_operational(hba);
+	if (!hba->mcq_enabled) {
+		err = ufshcd_make_hba_operational(hba);
+	} else {
+		ufs_mtk_config_mcq(hba, false);
+		ufshcd_mcq_make_queues_operational(hba);
+		ufshcd_mcq_config_mac(hba, hba->nutrs);
+		ufshcd_writel(hba, ufshcd_readl(hba, REG_UFS_MEM_CFG) | 0x1,
+			      REG_UFS_MEM_CFG);
+	}
+
 	if (err)
 		return err;

@@ -1495,6 +1543,136 @@ static int ufs_mtk_clk_scale_notify(struct ufs_hba *hba, bool scale_up,
 	return 0;
 }

+static int ufs_mtk_get_hba_mac(struct ufs_hba *hba)
+{
+	return MAX_SUPP_MAC;
+}
+
+static int ufs_mtk_op_runtime_config(struct ufs_hba *hba)
+{
+	struct ufshcd_mcq_opr_info_t *opr;
+	int i;
+
+	for (i = 0; i < OPR_MAX; i++) {
+		opr = &hba->mcq_opr[i];
+		opr->stride = REG_UFS_MCQ_STRIDE;
+	}
+
+	hba->mcq_opr[OPR_SQD].offset = REG_UFS_MTK_SQD;
+	hba->mcq_opr[OPR_SQIS].offset = REG_UFS_MTK_SQIS;
+	hba->mcq_opr[OPR_CQD].offset = REG_UFS_MTK_CQD;
+	hba->mcq_opr[OPR_CQIS].offset = REG_UFS_MTK_CQIS;
+
+	hba->mcq_opr[OPR_SQD].base = hba->mmio_base + REG_UFS_MTK_SQD;
+	hba->mcq_opr[OPR_SQIS].base = hba->mmio_base + REG_UFS_MTK_SQIS;
+	hba->mcq_opr[OPR_CQD].base = hba->mmio_base + REG_UFS_MTK_CQD;
+	hba->mcq_opr[OPR_CQIS].base = hba->mmio_base + REG_UFS_MTK_CQIS;
+
+	return 0;
+}
+
+static int ufs_mtk_mcq_config_resource(struct ufs_hba *hba)
+{
+	struct ufs_mtk_host *host = ufshcd_get_variant(hba);
+
+	/* fail mcq initialization if interrupt is not filled properly */
+	if (!host->mcq_nr_intr) {
+		dev_info(hba->dev, "IRQs not ready. MCQ disabled.");
+		return -EINVAL;
+	}
+
+	hba->mcq_base = hba->mmio_base + MCQ_QUEUE_OFFSET(hba->mcq_capabilities);
+	return 0;
+}
+
+static irqreturn_t ufs_mtk_mcq_intr(int irq, void *__intr_info)
+{
+	struct ufs_mtk_mcq_intr_info *mcq_intr_info = __intr_info;
+	struct ufs_hba *hba = mcq_intr_info->hba;
+	struct ufs_hw_queue *hwq;
+	u32 events;
+	int i = mcq_intr_info->qid;
+
+	hwq = &hba->uhq[i];
+
+	events = ufshcd_mcq_read_cqis(hba, i);
+	if (events)
+		ufshcd_mcq_write_cqis(hba, events, i);
+
+	if (events & UFSHCD_MCQ_CQIS_TAIL_ENT_PUSH_STS)
+		ufshcd_mcq_poll_cqe_lock(hba, hwq);
+
+	return IRQ_HANDLED;
+}
+
+static int ufs_mtk_config_mcq_irq(struct ufs_hba *hba)
+{
+	struct ufs_mtk_host *host = ufshcd_get_variant(hba);
+	u32 irq, i;
+	int ret;
+
+	for (i = 0; i < host->mcq_nr_intr; i++) {
+		irq = host->mcq_intr_info[i].irq;
+		if (irq == MTK_MCQ_INVALID_IRQ) {
+			dev_err(hba->dev, "invalid irq. %d\n", i);
+			return -ENOPARAM;
+		}
+
+		host->mcq_intr_info[i].qid = i;
+		ret = devm_request_irq(hba->dev, irq, ufs_mtk_mcq_intr, 0, UFSHCD,
+				       &host->mcq_intr_info[i]);
+
+		dev_info(hba->dev, "request irq %d intr %s\n", irq, ret ? "failed" : "");
+
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int ufs_mtk_config_mcq(struct ufs_hba *hba, bool irq)
+{
+	struct ufs_mtk_host *host = ufshcd_get_variant(hba);
+	int ret = 0;
+
+	if (!host->mcq_set_intr) {
+		/* Disable irq option register */
+		ufshcd_rmwl(hba, MCQ_INTR_EN_MSK, 0, REG_UFS_MMIO_OPT_CTRL_0);
+
+		if (irq)
+			ret = ufs_mtk_config_mcq_irq(hba);
+
+		if (ret)
+			return ret;
+
+		host->mcq_set_intr = true;
+	}
+
+	ufshcd_rmwl(hba, MCQ_AH8, MCQ_AH8, REG_UFS_MMIO_OPT_CTRL_0);
+	ufshcd_rmwl(hba, MCQ_INTR_EN_MSK, MCQ_MULTI_INTR_EN, REG_UFS_MMIO_OPT_CTRL_0);
+
+	return 0;
+}
+
+static int ufs_mtk_config_esi(struct ufs_hba *hba)
+{
+	return ufs_mtk_config_mcq(hba, true);
+}
+
+static int ufs_mtk_config_cqid(struct ufs_hba *hba)
+{
+	struct ufs_hw_queue *hwq;
+	int i;
+
+	for (i = 0; i < hba->nr_hw_queues; i++) {
+		hwq = &hba->uhq[i];
+		hwq->cqid = 3;
+	}
+
+	return 0;
+}
+
 /*
  * struct ufs_hba_mtk_vops - UFS MTK specific variant operations
  *
@@ -1518,6 +1696,12 @@ static const struct ufs_hba_variant_ops ufs_hba_mtk_vops = {
 	.event_notify        = ufs_mtk_event_notify,
 	.config_scaling_param = ufs_mtk_config_scaling_param,
 	.clk_scale_notify    = ufs_mtk_clk_scale_notify,
+	/* mcq vops */
+	.get_hba_mac         = ufs_mtk_get_hba_mac,
+	.op_runtime_config   = ufs_mtk_op_runtime_config,
+	.mcq_config_resource = ufs_mtk_mcq_config_resource,
+	.config_esi          = ufs_mtk_config_esi,
+	.config_cqid         = ufs_mtk_config_cqid,
 };

 /**
@@ -1564,7 +1748,7 @@ static int ufs_mtk_probe(struct platform_device *pdev)

 out:
 	if (err)
-		dev_info(dev, "probe failed %d\n", err);
+		dev_err(dev, "probe failed %d\n", err);

 	of_node_put(reset_node);
 	return err;
diff --git a/drivers/ufs/host/ufs-mediatek.h b/drivers/ufs/host/ufs-mediatek.h
index 2fc6d7b87694..6e41550e1830 100644
--- a/drivers/ufs/host/ufs-mediatek.h
+++ b/drivers/ufs/host/ufs-mediatek.h
@@ -10,11 +10,27 @@
 #include <linux/pm_qos.h>
 #include <linux/soc/mediatek/mtk_sip_svc.h>

+/*
+ * MCQ define and struct
+ */
+#define UFSHCD_MAX_Q_NR 8
+#define MTK_MCQ_INVALID_IRQ	0xFFFF
+
+/* REG_UFS_MMIO_OPT_CTRL_0 160h */
+#define EHS_EN                  0x1
+#define PFM_IMPV                0x2
+#define MCQ_MULTI_INTR_EN       0x4
+#define MCQ_CMB_INTR_EN         0x8
+#define MCQ_AH8                 0x10
+
+#define MCQ_INTR_EN_MSK         (MCQ_MULTI_INTR_EN | MCQ_CMB_INTR_EN)
+
 /*
  * Vendor specific UFSHCI Registers
  */
 #define REG_UFS_XOUFS_CTRL          0x140
 #define REG_UFS_REFCLK_CTRL         0x144
+#define REG_UFS_MMIO_OPT_CTRL_0     0x160
 #define REG_UFS_EXTREG              0x2100
 #define REG_UFS_MPHYCTRL            0x2200
 #define REG_UFS_MTK_IP_VER          0x2240
@@ -26,6 +42,13 @@
 #define REG_UFS_DEBUG_SEL_B2        0x22D8
 #define REG_UFS_DEBUG_SEL_B3        0x22DC

+#define REG_UFS_MTK_SQD             0x2800
+#define REG_UFS_MTK_SQIS            0x2814
+#define REG_UFS_MTK_CQD             0x281C
+#define REG_UFS_MTK_CQIS            0x2824
+
+#define REG_UFS_MCQ_STRIDE          0x30
+
 /*
  * Ref-clk control
  *
@@ -136,6 +159,12 @@ struct ufs_mtk_hw_ver {
 	u8 major;
 };

+struct ufs_mtk_mcq_intr_info {
+	struct ufs_hba *hba;
+	u32 irq;
+	u8 qid;
+};
+
 struct ufs_mtk_host {
 	struct phy *mphy;
 	struct pm_qos_request pm_qos_req;
@@ -155,6 +184,10 @@ struct ufs_mtk_host {
 	u16 ref_clk_ungating_wait_us;
 	u16 ref_clk_gating_wait_us;
 	u32 ip_ver;
+
+	bool mcq_set_intr;
+	int mcq_nr_intr;
+	struct ufs_mtk_mcq_intr_info mcq_intr_info[UFSHCD_MAX_Q_NR];
 };

 /*
--
2.18.0