linux-kernel - [PATCH 7/7] cpufreq: apple-soc: Add Apple A7-A8X SoC cpufreq support

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Message-ID: <20241211112244.18393-8-towinchenmi@gmail.com>
Date: Wed, 11 Dec 2024 19:19:34 +0800
From: Nick Chan <towinchenmi@...il.com>
To: Hector Martin <marcan@...can.st>,
	Sven Peter <sven@...npeter.dev>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	asahi@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-pm@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Nick Chan <towinchenmi@...il.com>
Subject: [PATCH 7/7] cpufreq: apple-soc: Add Apple A7-A8X SoC cpufreq support

These SoCs only use 3 bits for p-states, and have a different
APPLE_DVFS_CMD_PS1 mask value.

Signed-off-by: Nick Chan <towinchenmi@...il.com>
---
 drivers/cpufreq/apple-soc-cpufreq.c | 30 +++++++++++++++++++++++------
 1 file changed, 24 insertions(+), 6 deletions(-)

diff --git a/drivers/cpufreq/apple-soc-cpufreq.c b/drivers/cpufreq/apple-soc-cpufreq.c
index 0af36f911bea..12ee9123a1c2 100644
--- a/drivers/cpufreq/apple-soc-cpufreq.c
+++ b/drivers/cpufreq/apple-soc-cpufreq.c
@@ -22,12 +22,14 @@
 #include <linux/pm_opp.h>
 #include <linux/slab.h>
 
-#define APPLE_DVFS_CMD			0x20
-#define APPLE_DVFS_CMD_BUSY		BIT(31)
-#define APPLE_DVFS_CMD_SET		BIT(25)
-#define APPLE_DVFS_CMD_PS2		GENMASK(15, 12)
-#define APPLE_DVFS_CMD_PS1		GENMASK(4, 0)
-#define APPLE_DVFS_CMD_PS1_SHIFT	0
+#define APPLE_DVFS_CMD				0x20
+#define APPLE_DVFS_CMD_BUSY			BIT(31)
+#define APPLE_DVFS_CMD_SET			BIT(25)
+#define APPLE_DVFS_CMD_PS1_S5L8960X		GENMASK(24, 22)
+#define APPLE_DVFS_CMD_PS1_S5L8960X_SHIFT	22
+#define APPLE_DVFS_CMD_PS2			GENMASK(15, 12)
+#define APPLE_DVFS_CMD_PS1			GENMASK(4, 0)
+#define APPLE_DVFS_CMD_PS1_SHIFT		0
 
 /* Same timebase as CPU counter (24MHz) */
 #define APPLE_DVFS_LAST_CHG_TIME	0x38
@@ -36,6 +38,9 @@
  * Apple ran out of bits and had to shift this in T8112...
  */
 #define APPLE_DVFS_STATUS			0x50
+#define APPLE_DVFS_STATUS_CUR_PS_S5L8960X	GENMASK(5, 3)
+#define APPLE_DVFS_STATUS_CUR_PS_SHIFT_S5L8960X	3
+#define APPLE_DVFS_STATUS_TGT_PS_S5L8960X	GENMASK(2, 0)
 #define APPLE_DVFS_STATUS_CUR_PS_T8103		GENMASK(7, 4)
 #define APPLE_DVFS_STATUS_CUR_PS_SHIFT_T8103	4
 #define APPLE_DVFS_STATUS_TGT_PS_T8103		GENMASK(3, 0)
@@ -72,6 +77,15 @@ struct apple_cpu_priv {
 
 static struct cpufreq_driver apple_soc_cpufreq_driver;
 
+static const struct apple_soc_cpufreq_info soc_s5l8960x_info = {
+	.has_ps2 = false,
+	.max_pstate = 7,
+	.cur_pstate_mask = APPLE_DVFS_STATUS_CUR_PS_S5L8960X,
+	.cur_pstate_shift = APPLE_DVFS_STATUS_CUR_PS_SHIFT_S5L8960X,
+	.ps1_mask = APPLE_DVFS_CMD_PS1_S5L8960X,
+	.ps1_shift = APPLE_DVFS_CMD_PS1_S5L8960X_SHIFT,
+};
+
 static const struct apple_soc_cpufreq_info soc_t8103_info = {
 	.has_ps2 = true,
 	.max_pstate = 15,
@@ -99,6 +113,10 @@ static const struct apple_soc_cpufreq_info soc_default_info = {
 };
 
 static const struct of_device_id apple_soc_cpufreq_of_match[] __maybe_unused = {
+	{
+		.compatible = "apple,s5l8960x-cluster-cpufreq",
+		.data = &soc_s5l8960x_info,
+	},
 	{
 		.compatible = "apple,t8103-cluster-cpufreq",
 		.data = &soc_t8103_info,
-- 
2.47.1