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iommu/mediatek: Check 4GB mode by reading infracfg

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In previous discussion [1] and [2], we found that it is risky to
use max_pfn or totalram_pages to tell if 4GB mode is enabled.

Check 4GB mode by reading infracfg register, remove the usage
of the un-exported symbol max_pfn.

This is a step towards building mtk_iommu as a kernel module.

[1] https://lore.kernel.org/lkml/20200603161132.2441-1-miles.chen@mediatek.com/
[2] https://lore.kernel.org/lkml/20200604080120.2628-1-miles.chen@mediatek.com/
[3] https://lore.kernel.org/lkml/20200715205120.GA778876@bogus/

Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Yong Wu <yong.wu@mediatek.com>
Cc: Yingjoe Chen <yingjoe.chen@mediatek.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Rob Herring <robh@kernel.org>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Joerg Roedel <joro@8bytes.org>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Miles Chen <miles.chen@mediatek.com>
Link: https://lore.kernel.org/r/20200904104038.4979-1-miles.chen@mediatek.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Miles Chen 2020-09-04 18:40:38 +08:00 committed by Joerg Roedel
parent f53dd97874
commit c2c59456e1
2 changed files with 31 additions and 5 deletions
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33
drivers/iommu/mtk_iommu.c
View File

@ -3,7 +3,6 @@
* Copyright (c) 2015-2016 MediaTek Inc.
* Author: Yong Wu <yong.wu@mediatek.com>
*/
#include <linux/memblock.h>
#include <linux/bug.h>
#include <linux/clk.h>
#include <linux/component.h>
@ -15,13 +14,16 @@
#include <linux/iommu.h>
#include <linux/iopoll.h>
#include <linux/list.h>
#include <linux/mfd/syscon.h>
#include <linux/of_address.h>
#include <linux/of_iommu.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/soc/mediatek/infracfg.h>
#include <asm/barrier.h>
#include <soc/mediatek/smi.h>
@ -640,8 +642,11 @@ static int mtk_iommu_probe(struct platform_device *pdev)
struct resource *res;
resource_size_t ioaddr;
struct component_match *match = NULL;
struct regmap *infracfg;
void *protect;
int i, larb_nr, ret;
u32 val;
char *p;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
@ -655,10 +660,28 @@ static int mtk_iommu_probe(struct platform_device *pdev)
return -ENOMEM;
data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN);
/* Whether the current dram is over 4GB */
data->enable_4GB = !!(max_pfn > (BIT_ULL(32) >> PAGE_SHIFT));
if (!MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_4GB_MODE))
data->enable_4GB = false;
if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_4GB_MODE)) {
switch (data->plat_data->m4u_plat) {
case M4U_MT2712:
p = "mediatek,mt2712-infracfg";
break;
case M4U_MT8173:
p = "mediatek,mt8173-infracfg";
break;
default:
p = NULL;
}
infracfg = syscon_regmap_lookup_by_compatible(p);
if (IS_ERR(infracfg))
return PTR_ERR(infracfg);
ret = regmap_read(infracfg, REG_INFRA_MISC, &val);
if (ret)
return ret;
data->enable_4GB = !!(val & F_DDR_4GB_SUPPORT_EN);
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
data->base = devm_ioremap_resource(dev, res);

3
include/linux/soc/mediatek/infracfg.h
View File

@ -32,6 +32,9 @@
#define MT7622_TOP_AXI_PROT_EN_WB (BIT(2) | BIT(6) | \
BIT(7) | BIT(8))
#define REG_INFRA_MISC 0xf00
#define F_DDR_4GB_SUPPORT_EN BIT(13)
int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask,
bool reg_update);
int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask,