[PATCH v2 3/8] iommu/mediatek: Add mt2712 IOMMU support
From: Yong Wu
Date: Mon Aug 21 2017 - 07:01:15 EST
The M4U IP blocks in mt2712 is MTK's generation2 M4U which use the
ARM Short-descriptor like mt8173, and most of the HW registers are
the same.
The difference is that there are 2 M4U HWs in mt2712 while there's
only one in mt8173. The purpose of 2 M4U HWs is for balance the
bandwidth.
Normally if there are 2 M4U HWs, there should be 2 iommu domains,
each M4U has a iommu domain.
Signed-off-by: Yong Wu <yong.wu@xxxxxxxxxxxx>
---
drivers/iommu/mtk_iommu.c | 71 ++++++++++++++++++++++------------------------
drivers/iommu/mtk_iommu.h | 7 +++++
drivers/memory/mtk-smi.c | 54 +++++++++++++++++++++++++++++++++--
include/soc/mediatek/smi.h | 2 +-
4 files changed, 93 insertions(+), 41 deletions(-)
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 4db6c8f..df23e02 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -53,7 +53,11 @@
#define REG_MMU_CTRL_REG 0x110
#define F_MMU_PREFETCH_RT_REPLACE_MOD BIT(4)
-#define F_MMU_TF_PROTECT_SEL(prot) (((prot) & 0x3) << 5)
+#define F_MMU_TF_PROTECT_SEL_SHIFT(data) \
+ ((data)->m4u_plat == M4U_MT2712 ? 4 : 5)
+/* It's named by F_MMU_TF_PROT_SEL in mt2712. */
+#define F_MMU_TF_PROTECT_SEL(prot, data) \
+ (((prot) & 0x3) << F_MMU_TF_PROTECT_SEL_SHIFT(data))
#define REG_MMU_IVRP_PADDR 0x114
#define F_MMU_IVRP_PA_SET(pa, ext) (((pa) >> 1) | ((!!(ext)) << 31))
@@ -96,7 +100,7 @@
* Get the local arbiter ID and the portid within the larb arbiter
* from mtk_m4u_id which is defined by MTK_M4U_ID.
*/
-#define MTK_M4U_TO_LARB(id) (((id) >> 5) & 0x7)
+#define MTK_M4U_TO_LARB(id) (((id) >> 5) & 0xf)
#define MTK_M4U_TO_PORT(id) ((id) & 0x1f)
struct mtk_iommu_domain {
@@ -307,10 +311,6 @@ static int mtk_iommu_attach_device(struct iommu_domain *domain,
data->m4u_dom = NULL;
return ret;
}
- } else if (data->m4u_dom != dom) {
- /* All the client devices should be in the same m4u domain */
- dev_err(dev, "try to attach into the error iommu domain\n");
- return -EPERM;
}
mtk_iommu_config(data, dev, true);
@@ -470,8 +470,9 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
return ret;
}
- regval = F_MMU_PREFETCH_RT_REPLACE_MOD |
- F_MMU_TF_PROTECT_SEL(2);
+ regval = F_MMU_TF_PROTECT_SEL(2, data);
+ if (data->m4u_plat == M4U_MT8173)
+ regval |= F_MMU_PREFETCH_RT_REPLACE_MOD;
writel_relaxed(regval, data->base + REG_MMU_CTRL_REG);
regval = F_L2_MULIT_HIT_EN |
@@ -493,9 +494,11 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
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);
- writel_relaxed(0, data->base + REG_MMU_STANDARD_AXI_MODE);
+
+ /* It's MISC control register whose default value is ok except mt8173.*/
+ if (data->m4u_plat == M4U_MT8173)
+ writel_relaxed(0, data->base + REG_MMU_STANDARD_AXI_MODE);
if (devm_request_irq(data->dev, data->irq, mtk_iommu_isr, 0,
dev_name(data->dev), (void *)data)) {
@@ -527,6 +530,7 @@ static int mtk_iommu_probe(struct platform_device *pdev)
if (!data)
return -ENOMEM;
data->dev = dev;
+ data->m4u_plat = (enum mtk_iommu_plat)of_device_get_match_data(dev);
/* Protect memory. HW will access here while translation fault.*/
protect = devm_kzalloc(dev, MTK_PROTECT_PA_ALIGN * 2, GFP_KERNEL);
@@ -560,6 +564,7 @@ static int mtk_iommu_probe(struct platform_device *pdev)
for (i = 0; i < larb_nr; i++) {
struct device_node *larbnode;
struct platform_device *plarbdev;
+ u32 id;
larbnode = of_parse_phandle(dev->of_node, "mediatek,larbs", i);
if (!larbnode)
@@ -568,17 +573,14 @@ static int mtk_iommu_probe(struct platform_device *pdev)
if (!of_device_is_available(larbnode))
continue;
+ ret = of_property_read_u32(larbnode, "mediatek,larb-id", &id);
+ if (ret)/* The id is consecutive if there is no this property */
+ id = i;
+
plarbdev = of_find_device_by_node(larbnode);
- if (!plarbdev) {
- plarbdev = of_platform_device_create(
- larbnode, NULL,
- platform_bus_type.dev_root);
- if (!plarbdev) {
- of_node_put(larbnode);
- return -EPROBE_DEFER;
- }
- }
- data->smi_imu.larb_imu[i].dev = &plarbdev->dev;
+ if (!plarbdev)
+ return -EPROBE_DEFER;
+ data->smi_imu.larb_imu[id].dev = &plarbdev->dev;
component_match_add_release(dev, &match, release_of,
compare_of, larbnode);
@@ -646,8 +648,6 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
struct mtk_iommu_suspend_reg *reg = &data->reg;
void __iomem *base = data->base;
- writel_relaxed(data->m4u_dom->cfg.arm_v7s_cfg.ttbr[0],
- base + REG_MMU_PT_BASE_ADDR);
writel_relaxed(reg->standard_axi_mode,
base + REG_MMU_STANDARD_AXI_MODE);
writel_relaxed(reg->dcm_dis, base + REG_MMU_DCM_DIS);
@@ -656,15 +656,19 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
writel_relaxed(reg->int_main_control, base + REG_MMU_INT_MAIN_CONTROL);
writel_relaxed(F_MMU_IVRP_PA_SET(data->protect_base, data->enable_4GB),
base + REG_MMU_IVRP_PADDR);
+ if (data->m4u_dom)
+ writel(data->m4u_dom->cfg.arm_v7s_cfg.ttbr[0],
+ base + REG_MMU_PT_BASE_ADDR);
return 0;
}
-const struct dev_pm_ops mtk_iommu_pm_ops = {
+static const struct dev_pm_ops mtk_iommu_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(mtk_iommu_suspend, mtk_iommu_resume)
};
static const struct of_device_id mtk_iommu_of_ids[] = {
- { .compatible = "mediatek,mt8173-m4u", },
+ { .compatible = "mediatek,mt2712-m4u", .data = (void *)M4U_MT2712},
+ { .compatible = "mediatek,mt8173-m4u", .data = (void *)M4U_MT8173},
{}
};
@@ -673,27 +677,20 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
.remove = mtk_iommu_remove,
.driver = {
.name = "mtk-iommu",
- .of_match_table = mtk_iommu_of_ids,
+ .of_match_table = of_match_ptr(mtk_iommu_of_ids),
.pm = &mtk_iommu_pm_ops,
}
};
-static int mtk_iommu_init_fn(struct device_node *np)
+static int __init mtk_iommu_init(void)
{
int ret;
- struct platform_device *pdev;
-
- pdev = of_platform_device_create(np, NULL, platform_bus_type.dev_root);
- if (!pdev)
- return -ENOMEM;
ret = platform_driver_register(&mtk_iommu_driver);
- if (ret) {
- pr_err("%s: Failed to register driver\n", __func__);
- return ret;
- }
+ if (ret != 0)
+ pr_err("Failed to register MTK IOMMU driver\n");
- return 0;
+ return ret;
}
-IOMMU_OF_DECLARE(mtkm4u, "mediatek,mt8173-m4u", mtk_iommu_init_fn);
+subsys_initcall(mtk_iommu_init)
diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
index c06cc91..462e593 100644
--- a/drivers/iommu/mtk_iommu.h
+++ b/drivers/iommu/mtk_iommu.h
@@ -34,6 +34,12 @@ struct mtk_iommu_suspend_reg {
u32 int_main_control;
};
+enum mtk_iommu_plat {
+ M4U_MT2701,
+ M4U_MT2712,
+ M4U_MT8173,
+};
+
struct mtk_iommu_domain;
struct mtk_iommu_data {
@@ -50,6 +56,7 @@ struct mtk_iommu_data {
bool tlb_flush_active;
struct iommu_device iommu;
+ enum mtk_iommu_plat m4u_plat;
};
static inline int compare_of(struct device *dev, void *data)
diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
index 13f8c45..8ffe321 100644
--- a/drivers/memory/mtk-smi.c
+++ b/drivers/memory/mtk-smi.c
@@ -23,7 +23,10 @@
#include <soc/mediatek/smi.h>
#include <dt-bindings/memory/mt2701-larb-port.h>
+/* mt8173 */
#define SMI_LARB_MMU_EN 0xf00
+
+/* mt2701 */
#define REG_SMI_SECUR_CON_BASE 0x5c0
/* every register control 8 port, register offset 0x4 */
@@ -41,6 +44,10 @@
/* mt2701 domain should be set to 3 */
#define SMI_SECUR_CON_VAL_DOMAIN(id) (0x3 << ((((id) & 0x7) << 2) + 1))
+/* mt2712 */
+#define SMI_LARB_NONSEC_CON(id) (0x380 + ((id) * 4))
+#define F_MMU_EN BIT(0)
+
struct mtk_smi_larb_gen {
bool need_larbid;
int port_in_larb[MTK_LARB_NR_MAX + 1];
@@ -149,6 +156,15 @@ void mtk_smi_larb_put(struct device *larbdev)
struct mtk_smi_iommu *smi_iommu = data;
unsigned int i;
+ if (larb->larb_gen->need_larbid) {
+ larb->mmu = &smi_iommu->larb_imu[larb->larbid].mmu;
+ return 0;
+ }
+
+ /*
+ * If there is no larbid property, Loop to find the corresponding
+ * iommu information.
+ */
for (i = 0; i < smi_iommu->larb_nr; i++) {
if (dev == smi_iommu->larb_imu[i].dev) {
/* The 'mmu' may be updated in iommu-attach/detach. */
@@ -159,13 +175,32 @@ void mtk_smi_larb_put(struct device *larbdev)
return -ENODEV;
}
-static void mtk_smi_larb_config_port(struct device *dev)
+static void mtk_smi_larb_config_port_mt2712(struct device *dev)
{
struct mtk_smi_larb *larb = dev_get_drvdata(dev);
+ u32 reg;
+ int i;
- writel(*larb->mmu, larb->base + SMI_LARB_MMU_EN);
+ /*
+ * larb 8/9 is the bdpsys larb, the iommu_en is enabled defaultly.
+ * Don't need to set it again.
+ */
+ if (larb->larbid == 8 || larb->larbid == 9)
+ return;
+
+ for_each_set_bit(i, (unsigned long *)larb->mmu, 32) {
+ reg = readl_relaxed(larb->base + SMI_LARB_NONSEC_CON(i));
+ reg |= F_MMU_EN;
+ writel(reg, larb->base + SMI_LARB_NONSEC_CON(i));
+ }
}
+static void mtk_smi_larb_config_port_mt8173(struct device *dev)
+{
+ struct mtk_smi_larb *larb = dev_get_drvdata(dev);
+
+ writel(*larb->mmu, larb->base + SMI_LARB_MMU_EN);
+}
static void mtk_smi_larb_config_port_gen1(struct device *dev)
{
@@ -211,7 +246,7 @@ static void mtk_smi_larb_config_port_gen1(struct device *dev)
static const struct mtk_smi_larb_gen mtk_smi_larb_mt8173 = {
/* mt8173 do not need the port in larb */
- .config_port = mtk_smi_larb_config_port,
+ .config_port = mtk_smi_larb_config_port_mt8173,
};
static const struct mtk_smi_larb_gen mtk_smi_larb_mt2701 = {
@@ -223,6 +258,11 @@ static void mtk_smi_larb_config_port_gen1(struct device *dev)
.config_port = mtk_smi_larb_config_port_gen1,
};
+static const struct mtk_smi_larb_gen mtk_smi_larb_mt2712 = {
+ .need_larbid = true,
+ .config_port = mtk_smi_larb_config_port_mt2712,
+};
+
static const struct of_device_id mtk_smi_larb_of_ids[] = {
{
.compatible = "mediatek,mt8173-smi-larb",
@@ -232,6 +272,10 @@ static void mtk_smi_larb_config_port_gen1(struct device *dev)
.compatible = "mediatek,mt2701-smi-larb",
.data = &mtk_smi_larb_mt2701
},
+ {
+ .compatible = "mediatek,mt2712-smi-larb",
+ .data = &mtk_smi_larb_mt2712
+ },
{}
};
@@ -318,6 +362,10 @@ static int mtk_smi_larb_remove(struct platform_device *pdev)
.compatible = "mediatek,mt2701-smi-common",
.data = (void *)MTK_SMI_GEN1
},
+ {
+ .compatible = "mediatek,mt2712-smi-common",
+ .data = (void *)MTK_SMI_GEN2
+ },
{}
};
diff --git a/include/soc/mediatek/smi.h b/include/soc/mediatek/smi.h
index 8893c5e..5201e90 100644
--- a/include/soc/mediatek/smi.h
+++ b/include/soc/mediatek/smi.h
@@ -19,7 +19,7 @@
#ifdef CONFIG_MTK_SMI
-#define MTK_LARB_NR_MAX 8
+#define MTK_LARB_NR_MAX 16
#define MTK_SMI_MMU_EN(port) BIT(port)
--
1.9.1