build/patch/kernel/archive/starfive-6.1/1011-reset-starfive-Use-32bit-I-O-on-32bit-registers.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Emil Renner Berthing <kernel@esmil.dk>
Date: Wed, 24 Nov 2021 01:30:54 +0100
Subject: reset: starfive: Use 32bit I/O on 32bit registers

The driver currently uses 64bit I/O on the 32bit registers. This works
because there are 4 assert registers and 4 status register, so they're
only ever accessed on 64bit boundaries.

There are however other reset controllers for audio and video on the SoC
with only one status register that isn't 64bit aligned so 64bit I/O
would result in an unaligned access exception.

Switch to 32bit I/O in preparation for supporting these resets too.

Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
---
 drivers/reset/starfive/reset-starfive-jh7100.c | 40 +++++-----
 1 file changed, 20 insertions(+), 20 deletions(-)

diff --git a/drivers/reset/starfive/reset-starfive-jh7100.c b/drivers/reset/starfive/reset-starfive-jh7100.c
index fc44b2fb3e03..7563d317f5c8 100644
--- a/drivers/reset/starfive/reset-starfive-jh7100.c
+++ b/drivers/reset/starfive/reset-starfive-jh7100.c
@@ -34,16 +34,16 @@
  * lines don't though, so store the expected value of the status registers when
  * all lines are asserted.
  */
-static const u64 jh7100_reset_asserted[2] = {
+static const u32 jh7100_reset_asserted[4] = {
 	/* STATUS0 */
-	BIT_ULL_MASK(JH7100_RST_U74) |
-	BIT_ULL_MASK(JH7100_RST_VP6_DRESET) |
-	BIT_ULL_MASK(JH7100_RST_VP6_BRESET) |
+	BIT(JH7100_RST_U74 % 32) |
+	BIT(JH7100_RST_VP6_DRESET % 32) |
+	BIT(JH7100_RST_VP6_BRESET % 32),
 	/* STATUS1 */
-	BIT_ULL_MASK(JH7100_RST_HIFI4_DRESET) |
-	BIT_ULL_MASK(JH7100_RST_HIFI4_BRESET),
+	BIT(JH7100_RST_HIFI4_DRESET % 32) |
+	BIT(JH7100_RST_HIFI4_BRESET % 32),
 	/* STATUS2 */
-	BIT_ULL_MASK(JH7100_RST_E24) |
+	BIT(JH7100_RST_E24 % 32),
 	/* STATUS3 */
 	0,
 };
@@ -65,12 +65,12 @@ static int jh7100_reset_update(struct reset_controller_dev *rcdev,
 			       unsigned long id, bool assert)
 {
 	struct jh7100_reset *data = jh7100_reset_from(rcdev);
-	unsigned long offset = BIT_ULL_WORD(id);
-	u64 mask = BIT_ULL_MASK(id);
-	void __iomem *reg_assert = data->base + JH7100_RESET_ASSERT0 + offset * sizeof(u64);
-	void __iomem *reg_status = data->base + JH7100_RESET_STATUS0 + offset * sizeof(u64);
-	u64 done = jh7100_reset_asserted[offset] & mask;
-	u64 value;
+	unsigned long offset = id / 32;
+	u32 mask = BIT(id % 32);
+	void __iomem *reg_assert = data->base + JH7100_RESET_ASSERT0 + offset * sizeof(u32);
+	void __iomem *reg_status = data->base + JH7100_RESET_STATUS0 + offset * sizeof(u32);
+	u32 done = jh7100_reset_asserted[offset] & mask;
+	u32 value;
 	unsigned long flags;
 	int ret;
 
@@ -79,15 +79,15 @@ static int jh7100_reset_update(struct reset_controller_dev *rcdev,
 
 	spin_lock_irqsave(&data->lock, flags);
 
-	value = readq(reg_assert);
+	value = readl(reg_assert);
 	if (assert)
 		value |= mask;
 	else
 		value &= ~mask;
-	writeq(value, reg_assert);
+	writel(value, reg_assert);
 
 	/* if the associated clock is gated, deasserting might otherwise hang forever */
-	ret = readq_poll_timeout_atomic(reg_status, value, (value & mask) == done, 0, 1000);
+	ret = readl_poll_timeout_atomic(reg_status, value, (value & mask) == done, 0, 1000);
 
 	spin_unlock_irqrestore(&data->lock, flags);
 	return ret;
@@ -121,10 +121,10 @@ static int jh7100_reset_status(struct reset_controller_dev *rcdev,
 			       unsigned long id)
 {
 	struct jh7100_reset *data = jh7100_reset_from(rcdev);
-	unsigned long offset = BIT_ULL_WORD(id);
-	u64 mask = BIT_ULL_MASK(id);
-	void __iomem *reg_status = data->base + JH7100_RESET_STATUS0 + offset * sizeof(u64);
-	u64 value = readq(reg_status);
+	unsigned long offset = id / 32;
+	u32 mask = BIT(id % 32);
+	void __iomem *reg_status = data->base + JH7100_RESET_STATUS0 + offset * sizeof(u32);
+	u32 value = readl(reg_status);
 
 	return !((value ^ jh7100_reset_asserted[offset]) & mask);
 }
-- 
Armbian