linux-kernel - [PATCH 2/3] soc: samsung: exynos-pmu: add support for PMU

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Date: Wed, 26 Jun 2024 20:42:59 +0100
From: Peter Griffin <peter.griffin@...aro.org>
To: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	alim.akhtar@...sung.com,
	s.nawrocki@...sung.com,
	cw00.choi@...sung.com,
	mturquette@...libre.com,
	sboyd@...nel.org
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	tudor.ambarus@...aro.org,
	andre.draszik@...aro.org,
	kernel-team@...roid.com,
	willmcvicker@...gle.com,
	devicetree@...r.kernel.org,
	linux-clk@...r.kernel.org,
	Peter Griffin <peter.griffin@...aro.org>
Subject: [PATCH 2/3] soc: samsung: exynos-pmu: add support for PMU_ALIVE non atomic registers

Not all registers in PMU_ALIVE block support atomic set/clear operations.
GS101_SYSIP_DAT0 and GS101_SYSTEM_CONFIGURATION registers are two regs
where attempting atomic access fails.

As documentation on exactly which registers support atomic operations is
not forthcoming. We default to atomic access, unless the register is
explicitly added to the tensor_is_atomic() function. Update the comment
to reflect this as well.

Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
---
 drivers/soc/samsung/exynos-pmu.c            | 16 ++++++++++++++--
 include/linux/soc/samsung/exynos-regs-pmu.h |  4 ++++
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/samsung/exynos-pmu.c b/drivers/soc/samsung/exynos-pmu.c
index 624324f4001c..5556acc7c092 100644
--- a/drivers/soc/samsung/exynos-pmu.c
+++ b/drivers/soc/samsung/exynos-pmu.c
@@ -129,14 +129,26 @@ static int tensor_set_bits_atomic(void *ctx, unsigned int offset, u32 val,
 	return ret;
 }
 
+static bool tensor_is_atomic(unsigned int reg)
+{
+	switch (reg) {
+	case GS101_SYSIP_DAT0:
+	case GS101_SYSTEM_CONFIGURATION:
+		return false;
+	default:
+		return true;
+	}
+}
+
 static int tensor_sec_update_bits(void *ctx, unsigned int reg,
 				  unsigned int mask, unsigned int val)
 {
 	/*
 	 * Use atomic operations for PMU_ALIVE registers (offset 0~0x3FFF)
-	 * as the target registers can be accessed by multiple masters.
+	 * as the target registers can be accessed by multiple masters. Some
+	 * SFRs don't support this however as reported by tensor_is_atomic()
 	 */
-	if (reg > PMUALIVE_MASK)
+	if (reg > PMUALIVE_MASK || !tensor_is_atomic(reg))
 		return tensor_sec_reg_rmw(ctx, reg, mask, val);
 
 	return tensor_set_bits_atomic(ctx, reg, val, mask);
diff --git a/include/linux/soc/samsung/exynos-regs-pmu.h b/include/linux/soc/samsung/exynos-regs-pmu.h
index aa840ed043e1..f411c176536d 100644
--- a/include/linux/soc/samsung/exynos-regs-pmu.h
+++ b/include/linux/soc/samsung/exynos-regs-pmu.h
@@ -657,4 +657,8 @@
 #define EXYNOS5433_PAD_RETENTION_UFS_OPTION			(0x3268)
 #define EXYNOS5433_PAD_RETENTION_FSYSGENIO_OPTION		(0x32A8)
 
+/* For Tensor GS101 */
+#define GS101_SYSIP_DAT0					(0x810)
+#define GS101_SYSTEM_CONFIGURATION				(0x3A00)
+
 #endif /* __LINUX_SOC_EXYNOS_REGS_PMU_H */
-- 
2.45.2.741.gdbec12cfda-goog