[PATCH 2/2] iommu/mediatek: Add 4GB mode support

Yong Wu
2016-02-24T07:03:51Z

This patch add 4GB mode support for m4u.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
---
In this patch I use the global "max_pfn" to check whether the current
dram size is over 4GB, I am not sure this is proper.

If there is any other suggestions, please let me know.
Thanks.

drivers/iommu/mtk_iommu.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 721ffdb..5b1ddb5 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -11,6 +11,7 @@
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
+#include <linux/bootmem.h>
#include <linux/bug.h>
#include <linux/clk.h>
#include <linux/component.h>
@@ -56,7 +57,7 @@
#define F_MMU_TF_PROTECT_SEL(prot) (((prot) & 0x3) << 5)

#define REG_MMU_IVRP_PADDR 0x114
-#define F_MMU_IVRP_PA_SET(pa) ((pa) >> 1)
+#define F_MMU_IVRP_PA_SET(pa, ext) (((pa) >> 1) | ((!!(ext)) << 31))

#define REG_MMU_INT_CONTROL0 0x120
#define F_L2_MULIT_HIT_EN BIT(0)
@@ -125,6 +126,7 @@ struct mtk_iommu_data {
struct mtk_iommu_domain *m4u_dom;
struct iommu_group *m4u_group;
struct mtk_smi_iommu smi_imu; /* SMI larb iommu info */
+ bool enable_4GB;
};

static struct iommu_ops mtk_iommu_ops;
@@ -257,6 +259,9 @@ static int mtk_iommu_domain_finalise(struct mtk_iommu_data *data)
.iommu_dev = data->dev,
};

+ if (data->enable_4GB)
+ dom->cfg.quirks |= IO_PGTABLE_QUIRK_MTK_4GB_EXT;
+
dom->iop = alloc_io_pgtable_ops(ARM_V7S, &dom->cfg, data);
if (!dom->iop) {
dev_err(data->dev, "Failed to alloc io pgtable\n");
@@ -530,7 +535,7 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
F_INT_PRETETCH_TRANSATION_FIFO_FAULT;
writel_relaxed(regval, data->base + REG_MMU_INT_MAIN_CONTROL);

- writel_relaxed(F_MMU_IVRP_PA_SET(data->protect_base),
+ writel_relaxed(F_MMU_IVRP_PA_SET(data->protect_base, data->enable_4GB),
data->base + REG_MMU_IVRP_PADDR);

writel_relaxed(0, data->base + REG_MMU_DCM_DIS);
@@ -592,6 +597,9 @@ 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 size is over 4GB */
+ data->enable_4GB = !!(max_pfn > (0xffffffffUL >> PAGE_SHIFT));
+
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
data->base = devm_ioremap_resource(dev, res);
if (IS_ERR(data->base))
@@ -691,7 +699,7 @@ static int mtk_iommu_resume(struct device *dev)
writel_relaxed(reg->ctrl_reg, base + REG_MMU_CTRL_REG);
writel_relaxed(reg->int_control0, base + REG_MMU_INT_CONTROL0);
writel_relaxed(reg->int_main_control, base + REG_MMU_INT_MAIN_CONTROL);
- writel_relaxed(F_MMU_IVRP_PA_SET(data->protect_base),
+ writel_relaxed(F_MMU_IVRP_PA_SET(data->protect_base, data->enable_4GB),
base + REG_MMU_IVRP_PADDR);
return 0;
}
--
1.8.1.1.dirty