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

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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@amd.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Andi Shyti <andi.shyti@kernel.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Cc: Jean Delvare <jdelvare@suse.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Sanket Goswami <Sanket.Goswami@amd.com>
Cc: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Cc: Yazen Ghannam <yazen.ghannam@amd.com>
Cc: linux-i2c@vger.kernel.org
Link: https://lore.kernel.org/r/20250422234830.2840784-4-superm1@kernel.org
This commit is contained in:
Mario Limonciello 2025-04-22 18:48:28 -05:00 • committed by Ingo Molnar
parent 7e173eb82a
commit 624b0d5696
2 changed files with 20 additions and 9 deletions
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11
arch/x86/include/asm/amd/fch.h Normal file
View file

@ -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_ */

18
drivers/i2c/busses/i2c-piix4.c
View file

@ -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;
}