netdev - [PATCH 2/5] bus: mhi: host: Add support for 64bit register reads and writes

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Message-Id: <20250818-tsc_time_sync-v1-2-2747710693ba@oss.qualcomm.com>
Date: Mon, 18 Aug 2025 12:25:47 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: Manivannan Sadhasivam <mani@...nel.org>,
        Richard Cochran <richardcochran@...il.com>
Cc: mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        taniya.das@....qualcomm.com, imran.shaik@....qualcomm.com,
        quic_vbadigan@...cinc.com, quic_mrana@...cinc.com,
        Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Subject: [PATCH 2/5] bus: mhi: host: Add support for 64bit register reads
 and writes

Some mhi registers are of 64 bit size, instead of reading high value
and low value separately provide a new function op to read & write to
64 bit register.

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
---
 drivers/bus/mhi/host/main.c | 12 ++++++++++++
 include/linux/mhi.h         |  6 ++++++
 2 files changed, 18 insertions(+)

diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c
index 070b58a5ea75f121d4495d9dfd532f33cace274d..b7ceeb7261b708d46572d1f68dc277b6e1186b6e 100644
--- a/drivers/bus/mhi/host/main.c
+++ b/drivers/bus/mhi/host/main.c
@@ -67,6 +67,18 @@ void mhi_write_reg(struct mhi_controller *mhi_cntrl, void __iomem *base,
 	mhi_cntrl->write_reg(mhi_cntrl, base + offset, val);
 }
 
+static int __must_check mhi_read_reg64(struct mhi_controller *mhi_cntrl,
+				       void __iomem *base, u32 offset, u64 *out)
+{
+	return mhi_cntrl->read_reg64(mhi_cntrl, base + offset, out);
+}
+
+static void __maybe_unused mhi_write_reg64(struct mhi_controller *mhi_cntrl, void __iomem *base,
+					   u32 offset, u64 val)
+{
+	mhi_cntrl->write_reg64(mhi_cntrl, base + offset, val);
+}
+
 int __must_check mhi_write_reg_field(struct mhi_controller *mhi_cntrl,
 				     void __iomem *base, u32 offset, u32 mask,
 				     u32 val)
diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index 770d51e9bfac7434ff4b4013ad045c041c26adeb..540c90d7993ed9dc84d9ee29dd73ea2a81f0cd67 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -378,6 +378,8 @@ struct mhi_timesync_info {
  * @unmap_single: CB function to destroy TRE buffer
  * @read_reg: Read a MHI register via the physical link (required)
  * @write_reg: Write a MHI register via the physical link (required)
+ * @read_reg64: Read a 64 bit MHI register via the physical link (optional)
+ * @write_reg64: Write a 64 bit MHI register via the physical link (optional)
  * @reset: Controller specific reset function (optional)
  * @edl_trigger: CB function to trigger EDL mode (optional)
  * @buffer_len: Bounce buffer length
@@ -464,6 +466,10 @@ struct mhi_controller {
 			u32 *out);
 	void (*write_reg)(struct mhi_controller *mhi_cntrl, void __iomem *addr,
 			  u32 val);
+	int (*read_reg64)(struct mhi_controller *mhi_cntrl, void __iomem *addr,
+			  u64 *out);
+	void (*write_reg64)(struct mhi_controller *mhi_cntrl, void __iomem *addr,
+			    u64 val);
 	void (*reset)(struct mhi_controller *mhi_cntrl);
 	int (*edl_trigger)(struct mhi_controller *mhi_cntrl);
 

-- 
2.34.1