linux-kernel - [tip: x86/platform] i2c: piix4, x86/platform: Move the SB800 PIIX4 FCH definitions to <asm/amd/fch.h>

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Message-ID: <174566142040.31282.7334143550650903312.tip-bot2@tip-bot2>
Date: Sat, 26 Apr 2025 09:57:00 -0000
From: "tip-bot2 for Mario Limonciello" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Mario Limonciello <mario.limonciello@....com>,
 Ingo Molnar <mingo@...nel.org>, Andi Shyti <andi.shyti@...nel.org>,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 "H. Peter Anvin" <hpa@...or.com>, Hans de Goede <hdegoede@...hat.com>,
 ilpo.jarvinen@...ux.intel.com, Jean Delvare <jdelvare@...e.com>,
 Jonathan Corbet <corbet@....net>, Sanket Goswami <Sanket.Goswami@....com>,
 Shyam Sundar S K <Shyam-sundar.S-k@....com>,
 Yazen Ghannam <yazen.ghannam@....com>, linux-i2c@...r.kernel.org,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: x86/platform] i2c: piix4, x86/platform: Move the SB800 PIIX4
 FCH definitions to <asm/amd/fch.h>

The following commit has been merged into the x86/platform branch of tip:

Commit-ID:     624b0d5696a89b138408d385899dd35372db324b
Gitweb:        https://git.kernel.org/tip/624b0d5696a89b138408d385899dd35372db324b
Author:        Mario Limonciello <mario.limonciello@....com>
AuthorDate:    Tue, 22 Apr 2025 18:48:28 -05:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Sat, 26 Apr 2025 11:41:06 +02:00

i2c: piix4, x86/platform: Move the SB800 PIIX4 FCH definitions to <asm/amd/fch.h>

SB800_PIIX4_FCH_PM_ADDR is used to indicate the base address for the
FCH PM registers.  Multiple drivers may need this base address, so
move related defines to a common header location and rename them
accordingly.

Signed-off-by: Mario Limonciello <mario.limonciello@....com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Acked-by: Andi Shyti <andi.shyti@...nel.org>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Hans de Goede <hdegoede@...hat.com>
Cc: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Jean Delvare <jdelvare@...e.com>
Cc: Jonathan Corbet <corbet@....net>
Cc: Sanket Goswami <Sanket.Goswami@....com>
Cc: Shyam Sundar S K <Shyam-sundar.S-k@....com>
Cc: Yazen Ghannam <yazen.ghannam@....com>
Cc: linux-i2c@...r.kernel.org
Link: https://lore.kernel.org/r/20250422234830.2840784-4-superm1@kernel.org
---
 arch/x86/include/asm/amd/fch.h | 11 +++++++++++
 drivers/i2c/busses/i2c-piix4.c | 18 +++++++++---------
 2 files changed, 20 insertions(+), 9 deletions(-)
 create mode 100644 arch/x86/include/asm/amd/fch.h

diff --git a/arch/x86/include/asm/amd/fch.h b/arch/x86/include/asm/amd/fch.h
new file mode 100644
index 0000000..28972bd
--- /dev/null
+++ b/arch/x86/include/asm/amd/fch.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_AMD_FCH_H_
+#define _ASM_X86_AMD_FCH_H_
+
+#define FCH_PM_BASE			0xFED80300
+
+/* Register offsets from PM base: */
+#define FCH_PM_DECODEEN			0x00
+#define FCH_PM_DECODEEN_SMBUS0SEL	GENMASK(20, 19)
+
+#endif /* _ASM_X86_AMD_FCH_H_ */
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index dd75916..59ecaa9 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -34,6 +34,7 @@
 #include <linux/dmi.h>
 #include <linux/acpi.h>
 #include <linux/io.h>
+#include <asm/amd/fch.h>
 
 #include "i2c-piix4.h"
 
@@ -80,12 +81,11 @@
 #define SB800_PIIX4_PORT_IDX_MASK	0x06
 #define SB800_PIIX4_PORT_IDX_SHIFT	1
 
-/* On kerncz and Hudson2, SmBus0Sel is at bit 20:19 of PMx00 DecodeEn */
-#define SB800_PIIX4_PORT_IDX_KERNCZ		0x02
-#define SB800_PIIX4_PORT_IDX_MASK_KERNCZ	0x18
+/* SmBus0Sel is at bit 20:19 of PMx00 DecodeEn */
+#define SB800_PIIX4_PORT_IDX_KERNCZ		(FCH_PM_DECODEEN + 0x02)
+#define SB800_PIIX4_PORT_IDX_MASK_KERNCZ	(FCH_PM_DECODEEN_SMBUS0SEL >> 16)
 #define SB800_PIIX4_PORT_IDX_SHIFT_KERNCZ	3
 
-#define SB800_PIIX4_FCH_PM_ADDR			0xFED80300
 #define SB800_PIIX4_FCH_PM_SIZE			8
 #define SB800_ASF_ACPI_PATH			"\\_SB.ASFC"
 
@@ -162,19 +162,19 @@ int piix4_sb800_region_request(struct device *dev, struct sb800_mmio_cfg *mmio_c
 	if (mmio_cfg->use_mmio) {
 		void __iomem *addr;
 
-		if (!request_mem_region_muxed(SB800_PIIX4_FCH_PM_ADDR,
+		if (!request_mem_region_muxed(FCH_PM_BASE,
 					      SB800_PIIX4_FCH_PM_SIZE,
 					      "sb800_piix4_smb")) {
 			dev_err(dev,
 				"SMBus base address memory region 0x%x already in use.\n",
-				SB800_PIIX4_FCH_PM_ADDR);
+				FCH_PM_BASE);
 			return -EBUSY;
 		}
 
-		addr = ioremap(SB800_PIIX4_FCH_PM_ADDR,
+		addr = ioremap(FCH_PM_BASE,
 			       SB800_PIIX4_FCH_PM_SIZE);
 		if (!addr) {
-			release_mem_region(SB800_PIIX4_FCH_PM_ADDR,
+			release_mem_region(FCH_PM_BASE,
 					   SB800_PIIX4_FCH_PM_SIZE);
 			dev_err(dev, "SMBus base address mapping failed.\n");
 			return -ENOMEM;
@@ -201,7 +201,7 @@ void piix4_sb800_region_release(struct device *dev, struct sb800_mmio_cfg *mmio_
 {
 	if (mmio_cfg->use_mmio) {
 		iounmap(mmio_cfg->addr);
-		release_mem_region(SB800_PIIX4_FCH_PM_ADDR,
+		release_mem_region(FCH_PM_BASE,
 				   SB800_PIIX4_FCH_PM_SIZE);
 		return;
 	}