Commit 16a624a9 authored by Sascha Hauer's avatar Sascha Hauer Committed by Matthias Brugger

soc: mediatek: Add infracfg misc driver support

This adds support for some miscellaneous bits of the infracfg controller.
The mtk_infracfg_set/clear_bus_protection functions are necessary for
the scpsys power domain driver to handle the bus protection bits which
are contained in the infacfg register space.
Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: default avatarDaniel Kurtz <djkurtz@chromium.org>
Signed-off-by: default avatarMatthias Brugger <matthias.bgg@gmail.com>
parent d770e558
#
# MediaTek SoC drivers
#
config MTK_INFRACFG
bool "MediaTek INFRACFG Support"
depends on ARCH_MEDIATEK || COMPILE_TEST
select REGMAP
help
Say yes here to add support for the MediaTek INFRACFG controller. The
INFRACFG controller contains various infrastructure registers not
directly associated to any device.
config MTK_PMIC_WRAP
tristate "MediaTek PMIC Wrapper Support"
depends on ARCH_MEDIATEK
......
obj-$(CONFIG_MTK_INFRACFG) += mtk-infracfg.o
obj-$(CONFIG_MTK_PMIC_WRAP) += mtk-pmic-wrap.o
/*
* Copyright (c) 2015 Pengutronix, Sascha Hauer <kernel@pengutronix.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/export.h>
#include <linux/jiffies.h>
#include <linux/regmap.h>
#include <linux/soc/mediatek/infracfg.h>
#include <asm/processor.h>
#define INFRA_TOPAXI_PROTECTEN 0x0220
#define INFRA_TOPAXI_PROTECTSTA1 0x0228
/**
* mtk_infracfg_set_bus_protection - enable bus protection
* @regmap: The infracfg regmap
* @mask: The mask containing the protection bits to be enabled.
*
* This function enables the bus protection bits for disabled power
* domains so that the system does not hang when some unit accesses the
* bus while in power down.
*/
int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask)
{
unsigned long expired;
u32 val;
int ret;
regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, mask);
expired = jiffies + HZ;
while (1) {
ret = regmap_read(infracfg, INFRA_TOPAXI_PROTECTSTA1, &val);
if (ret)
return ret;
if ((val & mask) == mask)
break;
cpu_relax();
if (time_after(jiffies, expired))
return -EIO;
}
return 0;
}
/**
* mtk_infracfg_clear_bus_protection - disable bus protection
* @regmap: The infracfg regmap
* @mask: The mask containing the protection bits to be disabled.
*
* This function disables the bus protection bits previously enabled with
* mtk_infracfg_set_bus_protection.
*/
int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask)
{
unsigned long expired;
int ret;
regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, 0);
expired = jiffies + HZ;
while (1) {
u32 val;
ret = regmap_read(infracfg, INFRA_TOPAXI_PROTECTSTA1, &val);
if (ret)
return ret;
if (!(val & mask))
break;
cpu_relax();
if (time_after(jiffies, expired))
return -EIO;
}
return 0;
}
#ifndef __SOC_MEDIATEK_INFRACFG_H
#define __SOC_MEDIATEK_INFRACFG_H
#define MT8173_TOP_AXI_PROT_EN_MCI_M2 BIT(0)
#define MT8173_TOP_AXI_PROT_EN_MM_M0 BIT(1)
#define MT8173_TOP_AXI_PROT_EN_MM_M1 BIT(2)
#define MT8173_TOP_AXI_PROT_EN_MMAPB_S BIT(6)
#define MT8173_TOP_AXI_PROT_EN_L2C_M2 BIT(9)
#define MT8173_TOP_AXI_PROT_EN_L2SS_SMI BIT(11)
#define MT8173_TOP_AXI_PROT_EN_L2SS_ADD BIT(12)
#define MT8173_TOP_AXI_PROT_EN_CCI_M2 BIT(13)
#define MT8173_TOP_AXI_PROT_EN_MFG_S BIT(14)
#define MT8173_TOP_AXI_PROT_EN_PERI_M0 BIT(15)
#define MT8173_TOP_AXI_PROT_EN_PERI_M1 BIT(16)
#define MT8173_TOP_AXI_PROT_EN_DEBUGSYS BIT(17)
#define MT8173_TOP_AXI_PROT_EN_CQ_DMA BIT(18)
#define MT8173_TOP_AXI_PROT_EN_GCPU BIT(19)
#define MT8173_TOP_AXI_PROT_EN_IOMMU BIT(20)
#define MT8173_TOP_AXI_PROT_EN_MFG_M0 BIT(21)
#define MT8173_TOP_AXI_PROT_EN_MFG_M1 BIT(22)
#define MT8173_TOP_AXI_PROT_EN_MFG_SNOOP_OUT BIT(23)
int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask);
int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask);
#endif /* __SOC_MEDIATEK_INFRACFG_H */
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