[PATCH v5 10/14] soc: mediatek: Add multiple step bus protection control
From: Weiyi Lu
Date: Tue Mar 19 2019 - 04:02:12 EST
Both MT8183 & MT6765 have more control steps of bus protection
than previous project. And there add more bus protection registers
reside at infracfg & smi-common. Also add new APIs for multiple
step bus protection control with more customize arguments.
Signed-off-by: Weiyi Lu <weiyi.lu@xxxxxxxxxxxx>
---
drivers/soc/mediatek/Makefile | 2 +-
drivers/soc/mediatek/mtk-scpsys-ext.c | 99 +++++++++++++++++++++++++
drivers/soc/mediatek/mtk-scpsys.c | 24 ++++++
include/linux/soc/mediatek/scpsys-ext.h | 39 ++++++++++
4 files changed, 163 insertions(+), 1 deletion(-)
create mode 100644 drivers/soc/mediatek/mtk-scpsys-ext.c
create mode 100644 include/linux/soc/mediatek/scpsys-ext.h
diff --git a/drivers/soc/mediatek/Makefile b/drivers/soc/mediatek/Makefile
index 64ce5eeaba32..b9dbad6b12f9 100644
--- a/drivers/soc/mediatek/Makefile
+++ b/drivers/soc/mediatek/Makefile
@@ -1,4 +1,4 @@
obj-$(CONFIG_MTK_CMDQ) += mtk-cmdq-helper.o
-obj-$(CONFIG_MTK_INFRACFG) += mtk-infracfg.o
+obj-$(CONFIG_MTK_INFRACFG) += mtk-infracfg.o mtk-scpsys-ext.o
obj-$(CONFIG_MTK_PMIC_WRAP) += mtk-pmic-wrap.o
obj-$(CONFIG_MTK_SCPSYS) += mtk-scpsys.o
diff --git a/drivers/soc/mediatek/mtk-scpsys-ext.c b/drivers/soc/mediatek/mtk-scpsys-ext.c
new file mode 100644
index 000000000000..f630edb2f65d
--- /dev/null
+++ b/drivers/soc/mediatek/mtk-scpsys-ext.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018 MediaTek Inc.
+ * Author: Owen Chen <Owen.Chen@xxxxxxxxxxxx>
+ */
+#include <linux/ktime.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/soc/mediatek/scpsys-ext.h>
+
+#define MTK_POLL_DELAY_US 10
+#define MTK_POLL_TIMEOUT USEC_PER_SEC
+
+static int set_bus_protection(struct regmap *map, u32 mask, u32 ack_mask,
+ u32 reg_set, u32 reg_sta, u32 reg_en)
+{
+ u32 val;
+
+ if (reg_set)
+ regmap_write(map, reg_set, mask);
+ else
+ regmap_update_bits(map, reg_en, mask, mask);
+
+ return regmap_read_poll_timeout(map, reg_sta,
+ val, (val & ack_mask) == ack_mask,
+ MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
+}
+
+static int clear_bus_protection(struct regmap *map, u32 mask, u32 ack_mask,
+ u32 reg_clr, u32 reg_sta, u32 reg_en)
+{
+ u32 val;
+
+ if (reg_clr)
+ regmap_write(map, reg_clr, mask);
+ else
+ regmap_update_bits(map, reg_en, mask, 0);
+
+ return regmap_read_poll_timeout(map, reg_sta,
+ val, !(val & ack_mask),
+ MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
+}
+
+int mtk_scpsys_ext_set_bus_protection(const struct bus_prot *bp_table,
+ struct regmap *infracfg, struct regmap *smi_common)
+{
+ int i;
+
+ for (i = 0; i < MAX_STEPS && bp_table[i].mask; i++) {
+ struct regmap *map;
+ int ret;
+
+ if (bp_table[i].type == IFR_TYPE)
+ map = infracfg;
+ else if (bp_table[i].type == SMI_TYPE)
+ map = smi_common;
+ else
+ return -EINVAL;
+
+ ret = set_bus_protection(map,
+ bp_table[i].mask, bp_table[i].mask,
+ bp_table[i].set_ofs, bp_table[i].sta_ofs,
+ bp_table[i].en_ofs);
+
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+int mtk_scpsys_ext_clear_bus_protection(const struct bus_prot *bp_table,
+ struct regmap *infracfg, struct regmap *smi_common)
+{
+ int i;
+
+ for (i = MAX_STEPS - 1; i >= 0; i--) {
+ struct regmap *map;
+ int ret;
+
+ if (bp_table[i].type == IFR_TYPE)
+ map = infracfg;
+ else if (bp_table[i].type == SMI_TYPE)
+ map = smi_common;
+ else
+ return -EINVAL;
+
+ ret = clear_bus_protection(map,
+ bp_table[i].mask, bp_table[i].clr_ack_mask,
+ bp_table[i].clr_ofs, bp_table[i].sta_ofs,
+ bp_table[i].en_ofs);
+
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
index c6360de4e41e..181bf7bce591 100644
--- a/drivers/soc/mediatek/mtk-scpsys.c
+++ b/drivers/soc/mediatek/mtk-scpsys.c
@@ -12,6 +12,7 @@
#include <linux/pm_domain.h>
#include <linux/regulator/consumer.h>
#include <linux/soc/mediatek/infracfg.h>
+#include <linux/soc/mediatek/scpsys-ext.h>
#include <dt-bindings/power/mt2701-power.h>
#include <dt-bindings/power/mt2712-power.h>
@@ -121,6 +122,7 @@ static const char * const clk_names[] = {
* @basic_clk_name: provide the same purpose with field "clk_id"
* by declaring basic clock prefix name rather than clk_id.
* @caps: The flag for active wake-up action.
+ * @bp_table: The mask table for multiple step bus protection.
*/
struct scp_domain_data {
const char *name;
@@ -132,6 +134,7 @@ struct scp_domain_data {
enum clk_id clk_id[MAX_CLKS];
const char *basic_clk_name[MAX_CLKS];
u8 caps;
+ struct bus_prot bp_table[MAX_STEPS];
};
struct scp;
@@ -155,6 +158,7 @@ struct scp {
struct device *dev;
void __iomem *base;
struct regmap *infracfg;
+ struct regmap *smi_common;
struct scp_ctrl_reg ctrl_reg;
bool bus_prot_reg_update;
};
@@ -291,6 +295,10 @@ static int scpsys_bus_protect_enable(struct scp_domain *scpd)
ret = mtk_infracfg_set_bus_protection(scp->infracfg,
scpd->data->bus_prot_mask,
scp->bus_prot_reg_update);
+ } else if (scpd->data->bp_table[0].mask) {
+ ret = mtk_scpsys_ext_set_bus_protection(scpd->data->bp_table,
+ scp->infracfg,
+ scp->smi_common);
}
return ret;
@@ -305,6 +313,11 @@ static int scpsys_bus_protect_disable(struct scp_domain *scpd)
ret = mtk_infracfg_clear_bus_protection(scp->infracfg,
scpd->data->bus_prot_mask,
scp->bus_prot_reg_update);
+ } else if (scpd->data->bp_table[0].mask) {
+ ret = mtk_scpsys_ext_clear_bus_protection(
+ scpd->data->bp_table,
+ scp->infracfg,
+ scp->smi_common);
}
return ret;
@@ -475,6 +488,17 @@ static struct scp *init_scp(struct platform_device *pdev,
return ERR_CAST(scp->infracfg);
}
+ scp->smi_common = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
+ "smi_comm");
+
+ if (scp->smi_common == ERR_PTR(-ENODEV)) {
+ scp->smi_common = NULL;
+ } else if (IS_ERR(scp->smi_common)) {
+ dev_err(&pdev->dev, "Cannot find smi_common controller: %ld\n",
+ PTR_ERR(scp->smi_common));
+ return ERR_CAST(scp->smi_common);
+ }
+
for (i = 0; i < num; i++) {
struct scp_domain *scpd = &scp->domains[i];
const struct scp_domain_data *data = &scp_domain_data[i];
diff --git a/include/linux/soc/mediatek/scpsys-ext.h b/include/linux/soc/mediatek/scpsys-ext.h
new file mode 100644
index 000000000000..d0ed295c88a7
--- /dev/null
+++ b/include/linux/soc/mediatek/scpsys-ext.h
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __SOC_MEDIATEK_SCPSYS_EXT_H
+#define __SOC_MEDIATEK_SCPSYS_EXT_H
+
+#define MAX_STEPS 4
+
+#define BUS_PROT(_type, _set_ofs, _clr_ofs, \
+ _en_ofs, _sta_ofs, _mask, _clr_ack_mask) { \
+ .type = _type, \
+ .set_ofs = _set_ofs, \
+ .clr_ofs = _clr_ofs, \
+ .en_ofs = _en_ofs, \
+ .sta_ofs = _sta_ofs, \
+ .mask = _mask, \
+ .clr_ack_mask = _clr_ack_mask, \
+ }
+
+enum regmap_type {
+ IFR_TYPE,
+ SMI_TYPE,
+ MAX_REGMAP_TYPE,
+};
+
+struct bus_prot {
+ enum regmap_type type;
+ u32 set_ofs;
+ u32 clr_ofs;
+ u32 en_ofs;
+ u32 sta_ofs;
+ u32 mask;
+ u32 clr_ack_mask;
+};
+
+int mtk_scpsys_ext_set_bus_protection(const struct bus_prot *bp_table,
+ struct regmap *infracfg, struct regmap *smi_common);
+int mtk_scpsys_ext_clear_bus_protection(const struct bus_prot *bp_table,
+ struct regmap *infracfg, struct regmap *smi_common);
+
+#endif /* __SOC_MEDIATEK_SCPSYS_EXT_H */
--
2.18.0