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[v2,07/13] ufs/ufs.h: Add definition of 'ufshcd_rmwl()'

Message ID 20240920-topic-ufs-enhancements-v2-7-65ae61e73eaa@linaro.org
State Superseded
Headers show
Series ufs: enhancements to support Qualcomm UFS controllers | expand

Commit Message

Neil Armstrong Sept. 20, 2024, 8 a.m. UTC 
From: Bhupesh Sharma <bhupesh.linux@gmail.com>

Add definition of 'ufshcd_rmwl()' helper function
which would be later used by Qualcomm UFS driver
to read-modify-write registers.

Ported from Linux kernel commits:
e785060ea3a1 ("ufs: definitions for phy interface")
cff91daf52d3 ("scsi: ufs: Fix kernel-doc syntax in ufshcd.h")

Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
Tested-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@amd.com>
---
 drivers/ufs/ufs.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
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Patch

diff --git a/drivers/ufs/ufs.h b/drivers/ufs/ufs.h
index b55c4a9e996..555f8a6857d 100644
--- a/drivers/ufs/ufs.h
+++ b/drivers/ufs/ufs.h
@@ -3,6 +3,7 @@ 
 #define __UFS_H
 
 #include <linux/types.h>
+#include <asm/io.h>
 #include "unipro.h"
 
 struct udevice;
@@ -933,6 +934,23 @@  enum {
 #define ufshcd_readl(hba, reg) \
 	readl((hba)->mmio_base + (reg))
 
+/**
+ * ufshcd_rmwl - perform read/modify/write for a controller register
+ * @hba: per adapter instance
+ * @mask: mask to apply on read value
+ * @val: actual value to write
+ * @reg: register address
+ */
+static inline void ufshcd_rmwl(struct ufs_hba *hba, u32 mask, u32 val, u32 reg)
+{
+	u32 tmp;
+
+	tmp = ufshcd_readl(hba, reg);
+	tmp &= ~mask;
+	tmp |= (val & mask);
+	ufshcd_writel(hba, tmp, reg);
+}
+
 /* UTRLRSR - UTP Transfer Request Run-Stop Register 60h */
 #define UTP_TRANSFER_REQ_LIST_RUN_STOP_BIT	0x1