netdev - [PATCH 3/5] bus: mhi: pci_generic: Add support for 64 bit register read & write

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Message-Id: <20250818-tsc_time_sync-v1-3-2747710693ba@oss.qualcomm.com>
Date: Mon, 18 Aug 2025 12:25:48 +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 3/5] bus: mhi: pci_generic: Add support for 64 bit register
 read & write

Add functions which does read and write on 64 bit registers.

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
---
 drivers/bus/mhi/host/pci_generic.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c
index 4edb5bb476baf02af02aed00be0d6bacf9e92634..e6c13c1a35253e6630b193827f8dadcd22a6198a 100644
--- a/drivers/bus/mhi/host/pci_generic.c
+++ b/drivers/bus/mhi/host/pci_generic.c
@@ -1039,6 +1039,27 @@ struct mhi_pci_device {
 	unsigned long status;
 };
 
+#ifdef readq
+static int mhi_pci_read_reg64(struct mhi_controller *mhi_cntrl,
+			      void __iomem *addr, u64 *out)
+{
+	*out = readq(addr);
+	return 0;
+}
+#else
+#define mhi_pci_read_reg64 NULL
+#endif
+
+#ifdef writeq
+static void mhi_pci_write_reg64(struct mhi_controller *mhi_cntrl,
+				void __iomem *addr, u64 val)
+{
+	writeq(val, addr);
+}
+#else
+#define mhi_pci_write_reg64 NULL
+#endif
+
 static int mhi_pci_read_reg(struct mhi_controller *mhi_cntrl,
 			    void __iomem *addr, u32 *out)
 {
@@ -1324,6 +1345,8 @@ static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	mhi_cntrl->read_reg = mhi_pci_read_reg;
 	mhi_cntrl->write_reg = mhi_pci_write_reg;
+	mhi_cntrl->read_reg64 = mhi_pci_read_reg64;
+	mhi_cntrl->write_reg64 = mhi_pci_write_reg64;
 	mhi_cntrl->status_cb = mhi_pci_status_cb;
 	mhi_cntrl->runtime_get = mhi_pci_runtime_get;
 	mhi_cntrl->runtime_put = mhi_pci_runtime_put;

-- 
2.34.1