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From:   Asutosh Das <quic_asutoshd@quicinc.com>
To:     <mani@kernel.org>, <quic_nguyenb@quicinc.com>,
        <quic_xiaosenh@quicinc.com>, <quic_cang@quicinc.com>,
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        <quic_richardp@quicinc.com>, <stanley.chu@mediatek.com>,
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        <avri.altman@wdc.com>, <beanhuo@micron.com>,
        <martin.petersen@oracle.com>
CC:     <linux-scsi@vger.kernel.org>,
        Asutosh Das <quic_asutoshd@quicinc.com>,
        Alim Akhtar <alim.akhtar@samsung.com>,
        "James E.J. Bottomley" <jejb@linux.ibm.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        open list <linux-kernel@vger.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@lists.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@lists.infradead.org>
Subject: [PATCH v1 05/16] ufs: core: mcq: Configure resource regions
Date:   Thu, 22 Sep 2022 18:05:12 -0700
Message-ID: <4d4df6ad6353b93253fb22deefb772dc59f5c84e.1663894792.git.quic_asutoshd@quicinc.com>
In-Reply-To: <cover.1663894792.git.quic_asutoshd@quicinc.com>
References: <cover.1663894792.git.quic_asutoshd@quicinc.com>
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Precedence: bulk

Define the mcq resources and add support to ioremap
the resource regions.

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
---
 drivers/ufs/core/ufs-mcq.c | 100 ++++++++++++++++++++++++++++++++++++++++++++-
 include/ufs/ufshcd.h       |  28 +++++++++++++
 2 files changed, 127 insertions(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
index 934556f..e5cc7ab 100644
--- a/drivers/ufs/core/ufs-mcq.c
+++ b/drivers/ufs/core/ufs-mcq.c
@@ -17,6 +17,12 @@
 #define UFS_MCQ_MIN_READ_QUEUES 0
 #define UFS_MCQ_MIN_POLL_QUEUES 0
 
+#define MCQ_QCFGPTR_MASK	GENMASK(7, 0)
+#define MCQ_QCFGPTR_UNIT	0x200
+#define MCQ_SQATTR_OFFSET(c) \
+	((((c) >> 16) & MCQ_QCFGPTR_MASK) * MCQ_QCFGPTR_UNIT)
+#define MCQ_QCFG_SIZE	0x40
+
 static unsigned int dev_cmd_queue = 1;
 
 static int rw_queue_count_set(const char *val, const struct kernel_param *kp)
@@ -85,6 +91,96 @@ module_param_cb(poll_queues, &poll_queue_count_ops, &poll_queues, 0644);
 MODULE_PARM_DESC(poll_queues,
 		 "Number of poll queues used for r/w. Default value is 1");
 
+/* Resources */
+static const struct ufshcd_res_info_t ufshcd_res_info[RES_MAX] = {
+	{.name = "ufs_mem", .resource = NULL, .base = NULL},
+	{.name = "mcq", .resource = NULL, .base = NULL},
+	/* Submission Queue DAO */
+	{.name = "mcq_sqd", .resource = NULL, .base = NULL},
+	/* Submission Queue Interrupt Status */
+	{.name = "mcq_sqis", .resource = NULL, .base = NULL},
+	/* Completion Queue DAO */
+	{.name = "mcq_cqd", .resource = NULL, .base = NULL},
+	/* Completion Queue Interrupt Status */
+	{.name = "mcq_cqis", .resource = NULL, .base = NULL},
+	/* MCQ vendor specific */
+	{.name = "mcq_vs", .resource = NULL, .base = NULL},
+};
+
+static int ufshcd_mcq_config_resource(struct ufs_hba *hba)
+{
+	struct platform_device *pdev = to_platform_device(hba->dev);
+	struct ufshcd_res_info_t *res;
+	struct resource *res_mem, *res_mcq;
+	int i, ret = 0;
+
+	memcpy(hba->res, ufshcd_res_info, sizeof(ufshcd_res_info));
+
+	for (i = 0; i < RES_MAX; i++) {
+		res = &hba->res[i];
+		res->resource = platform_get_resource_byname(pdev,
+							     IORESOURCE_MEM,
+							     res->name);
+		if (!res->resource) {
+			dev_info(hba->dev, "Resource %s not provided\n", res->name);
+			if (i == RES_MEM)
+				return -ENOMEM;
+			continue;
+		} else if (i == RES_MEM) {
+			res_mem = res->resource;
+			res->base = hba->mmio_base;
+			continue;
+		}
+
+		res->base = devm_ioremap_resource(hba->dev, res->resource);
+		if (IS_ERR(res->base)) {
+			dev_err(hba->dev, "Failed to map res %s, err=%d\n",
+					 res->name, (int)PTR_ERR(res->base));
+			res->base = NULL;
+			ret = PTR_ERR(res->base);
+			return ret;
+		}
+	}
+
+	res = &hba->res[RES_MCQ];
+	/* MCQ resource provided in DT */
+	if (res->base)
+		goto out;
+
+	/* Manually allocate MCQ resource */
+	res_mcq = res->resource;
+	res_mcq = devm_kzalloc(hba->dev, sizeof(*res_mcq), GFP_KERNEL);
+	if (!res_mcq) {
+		dev_err(hba->dev, "Failed to alloate MCQ resource\n");
+		return ret;
+	}
+
+	res_mcq->start = res_mem->start +
+			 MCQ_SQATTR_OFFSET(hba->mcq_capabilities);
+	res_mcq->end = res_mcq->start + hba->nr_hw_queues * MCQ_QCFG_SIZE - 1;
+	res_mcq->flags = res_mem->flags;
+	res_mcq->name = "mcq";
+
+	ret = insert_resource(&iomem_resource, res_mcq);
+	if (ret) {
+		dev_err(hba->dev, "Failed to insert MCQ resource %d\n", ret);
+		return ret;
+	}
+
+	res->base = devm_ioremap_resource(hba->dev, res_mcq);
+	if (IS_ERR(res->base)) {
+		dev_err(hba->dev, "Map MCQ registers failed, err=%d\n",
+			(int)PTR_ERR(res->base));
+		ret = PTR_ERR(res->base);
+		res->base = NULL;
+		return ret;
+	}
+
+out:
+	hba->mcq_base = res->base;
+	return 0;
+}
+
 static int ufshcd_mcq_config_nr_queues(struct ufs_hba *hba)
 {
 	int i, rem;
@@ -126,7 +222,9 @@ int ufshcd_mcq_init(struct ufs_hba *hba)
 	int ret;
 
 	ret = ufshcd_mcq_config_nr_queues(hba);
-
+	if (ret)
+		return ret;
+	ret = ufshcd_mcq_config_resource(hba);
 	return ret;
 }
 
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index 298e103..54d742a 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -720,6 +720,30 @@ struct ufs_hba_monitor {
 };
 
 /**
+ * struct ufshcd_res_info_t - MCQ related resource regions
+ *
+ * @name: resource name
+ * @resource: pointer to resource region
+ * @base: register base address
+ */
+struct ufshcd_res_info_t {
+	const char *name;
+	struct resource *resource;
+	void __iomem *base;
+};
+
+enum ufshcd_res {
+	RES_MEM,
+	RES_MCQ,
+	RES_MCQ_SQD,
+	RES_MCQ_SQIS,
+	RES_MCQ_CQD,
+	RES_MCQ_CQIS,
+	RES_MCQ_VS,
+	RES_MAX,
+};
+
+/**
  * struct ufs_hba - per adapter private structure
  * @mmio_base: UFSHCI base register address
  * @ucdl_base_addr: UFS Command Descriptor base address
@@ -829,6 +853,8 @@ struct ufs_hba_monitor {
  * @mcq_sup: is mcq supported by UFSHC
  * @nr_hw_queues: number of hardware queues configured
  * @nr_queues: number of Queues of different queue types
+ * @res: array of resource info of MCQ registers
+ * @mcq_base: Multi circular queue registers base address
  */
 struct ufs_hba {
 	void __iomem *mmio_base;
@@ -981,6 +1007,8 @@ struct ufs_hba {
 	bool mcq_sup;
 	unsigned int nr_hw_queues;
 	unsigned int nr_queues[HCTX_MAX_TYPES];
+	struct ufshcd_res_info_t res[RES_MAX];
+	void __iomem *mcq_base;
 };
 
 static inline bool is_mcq_supported(struct ufs_hba *hba)
-- 
2.7.4