In order to avoid handling glitch signal when MTCMOS on/off, SMI need
clamp and reset operation. Parse power reset settings for LARBs which
need to reset. Register genpd callback for SMI LARBs and apply reset
operations in the callback.
Signed-off-by: friday.yang <friday.yang@xxxxxxxxxxxx>
---
drivers/memory/mtk-smi.c | 148 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 146 insertions(+), 2 deletions(-)
diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
index fbe52ecc0eca..1ccd62a17b1d 100644
--- a/drivers/memory/mtk-smi.c
+++ b/drivers/memory/mtk-smi.c
@@ -10,11 +10,16 @@
#include <linux/err.h>
#include <linux/io.h>
#include <linux/iopoll.h>
+#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/reset-controller.h>
#include <linux/soc/mediatek/mtk_sip_svc.h>
#include <soc/mediatek/smi.h>
#include <dt-bindings/memory/mt2701-larb-port.h>
@@ -36,6 +41,13 @@
#define SMI_DCM 0x300
#define SMI_DUMMY 0x444
+#define SMI_COMMON_CLAMP_EN 0x3c0
+#define SMI_COMMON_CLAMP_EN_SET 0x3c4
+#define SMI_COMMON_CLAMP_EN_CLR 0x3c8
+#define SMI_COMMON_CLAMP_MASK(inport) BIT(inport)
+
+#define SMI_SUB_COMM_INPORT_NR (8)
+
/* SMI LARB */
#define SMI_LARB_SLP_CON 0xc
#define SLP_PROT_EN BIT(0)
@@ -150,6 +162,7 @@ struct mtk_smi {
};
struct mtk_smi_larb { /* larb: local arbiter */
+ struct device *dev;
struct mtk_smi smi;
void __iomem *base;
struct device *smi_common_dev; /* common or sub-common dev */
@@ -157,6 +170,10 @@ struct mtk_smi_larb { /* larb: local arbiter */
int larbid;
u32 *mmu;
unsigned char *bank;
+ struct regmap *sub_comm_syscon;
+ int sub_comm_inport;
+ struct notifier_block nb;
+ struct reset_control *rst_con;
};
static int
@@ -472,6 +489,60 @@ static void mtk_smi_larb_sleep_ctrl_disable(struct mtk_smi_larb *larb)
writel_relaxed(0, larb->base + SMI_LARB_SLP_CON);
}
+static int mtk_smi_larb_clamp_protect_enable(struct device *dev)
+{
+ struct mtk_smi_larb *larb = dev_get_drvdata(dev);
+ int ret;
+
+ /* sub_comm_syscon could be NULL if larb directly linked to SMI common */
+ if (!larb->sub_comm_syscon)
+ return -EINVAL;
+
+ ret = regmap_write(larb->sub_comm_syscon, SMI_COMMON_CLAMP_EN_SET,
+ SMI_COMMON_CLAMP_MASK(larb->sub_comm_inport));
+ if (ret)
+ dev_err(dev, "Unable to enable clamp, inport %d, ret %d\n",
+ larb->sub_comm_inport, ret);
+
+ return ret;
+}
+
+static int mtk_smi_larb_clamp_protect_disble(struct device *dev)
+{
+ struct mtk_smi_larb *larb = dev_get_drvdata(dev);
+ int ret;
+
+ /* sub_comm_syscon could be NULL if larb directly linked to SMI common */
+ if (!larb->sub_comm_syscon)
+ return -EINVAL;
+
+ ret = regmap_write(larb->sub_comm_syscon, SMI_COMMON_CLAMP_EN_CLR,
+ SMI_COMMON_CLAMP_MASK(larb->sub_comm_inport));
+ if (ret)
+ dev_err(dev, "Unable to disable clamp, inport %d, ret %d\n",
+ larb->sub_comm_inport, ret);
+
+ return ret;
+}
+
+static int mtk_smi_genpd_callback(struct notifier_block *nb,
+ unsigned long flags, void *data)
+{
+ struct mtk_smi_larb *larb = container_of(nb, struct mtk_smi_larb, nb);
+ struct device *dev = larb->dev;
+
+ if (flags == GENPD_NOTIFY_PRE_ON || flags == GENPD_NOTIFY_PRE_OFF) {
+ /* disable related SMI sub-common port */
+ mtk_smi_larb_clamp_protect_enable(dev);
+ } else if (flags == GENPD_NOTIFY_ON) {
+ /* enable related SMI sub-common port */
+ reset_control_reset(larb->rst_con);
+ mtk_smi_larb_clamp_protect_disble(dev);
+ }
+
+ return NOTIFY_OK;
+}
+
static int mtk_smi_device_link_common(struct device *dev, struct device **com_dev)
{
struct platform_device *smi_com_pdev;
@@ -528,6 +599,59 @@ static int mtk_smi_dts_clk_init(struct device *dev, struct mtk_smi *smi,
return ret;
}
+static int mtk_smi_larb_parse_clamp_info(struct mtk_smi_larb *larb)
+{
+ struct device *dev = larb->dev;
+ struct device_node *smi_node;
+ int ret;
+
+ /* smi_node could be NULL if larb directly linked to SMI common */
+ smi_node = of_parse_phandle(dev->of_node, "mediatek,smi-sub-comm", 0);
+ if (!smi_node)
+ return 0;
+
+ larb->sub_comm_syscon = device_node_to_regmap(smi_node);
+ of_node_put(smi_node);
+ ret = of_property_read_u32(dev->of_node,
+ "mediatek,smi-sub-comm-in-portid",
+ &larb->sub_comm_inport);
+
+ if (IS_ERR(larb->sub_comm_syscon) || ret ||
+ larb->sub_comm_inport >= SMI_SUB_COMM_INPORT_NR) {
+ larb->sub_comm_syscon = NULL;
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int mtk_smi_larb_parse_reset_info(struct mtk_smi_larb *larb)
+{
+ struct device_node *reset_node;
+ struct device *dev = larb->dev;
+ int ret;
+
+ /* only larb with "resets" need to get reset setting */
+ reset_node = of_parse_phandle(dev->of_node, "resets", 0);
+ if (!reset_node)
+ return 0;
+ of_node_put(reset_node);
+
+ larb->rst_con = devm_reset_control_get(dev, "larb_rst");
+ if (IS_ERR(larb->rst_con))
+ return dev_err_probe(dev, PTR_ERR(larb->rst_con),
+ "cannot get larb reset controller\n");
+
+ larb->nb.notifier_call = mtk_smi_genpd_callback;
+ ret = dev_pm_genpd_add_notifier(dev, &larb->nb);
+ if (ret) {
+ dev_err(dev, "Failed to add genpd callback %d\n", ret);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int mtk_smi_larb_probe(struct platform_device *pdev)
{
struct mtk_smi_larb *larb;
@@ -538,6 +662,7 @@ static int mtk_smi_larb_probe(struct platform_device *pdev)
if (!larb)
return -ENOMEM;
+ larb->dev = dev;
larb->larb_gen = of_device_get_match_data(dev);
larb->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(larb->base))
@@ -554,15 +679,29 @@ static int mtk_smi_larb_probe(struct platform_device *pdev)
if (ret < 0)
return ret;
- pm_runtime_enable(dev);
+ /* find sub common to clamp larb for ISP software reset */
+ ret = mtk_smi_larb_parse_clamp_info(larb);
+ if (ret) {
+ dev_err(dev, "Failed to get clamp setting for larb\n");
+ goto err_pm_disable;
+ }
+
+ ret = mtk_smi_larb_parse_reset_info(larb);
+ if (ret) {
+ dev_err(dev, "Failed to get power setting for larb\n");
+ goto err_pm_disable;
+ }
+
platform_set_drvdata(pdev, larb);
ret = component_add(dev, &mtk_smi_larb_component_ops);
if (ret)
goto err_pm_disable;
+
+ pm_runtime_enable(dev);
+
return 0;
err_pm_disable:
- pm_runtime_disable(dev);
device_link_remove(dev, larb->smi_common_dev);
return ret;
}
@@ -686,6 +825,10 @@ static const struct mtk_smi_common_plat mtk_smi_common_mt8188_vpp = {
.init = mtk_smi_common_mt8195_init,
};
+static const struct mtk_smi_common_plat mtk_smi_sub_common_mt8188 = {
+ .type = MTK_SMI_GEN2_SUB_COMM,
+};
+
static const struct mtk_smi_common_plat mtk_smi_common_mt8192 = {
.type = MTK_SMI_GEN2,
.has_gals = true,
@@ -729,6 +872,7 @@ static const struct of_device_id mtk_smi_common_of_ids[] = {
{.compatible = "mediatek,mt8186-smi-common", .data = &mtk_smi_common_mt8186},
{.compatible = "mediatek,mt8188-smi-common-vdo", .data = &mtk_smi_common_mt8188_vdo},
{.compatible = "mediatek,mt8188-smi-common-vpp", .data = &mtk_smi_common_mt8188_vpp},
+ {.compatible = "mediatek,mt8188-smi-sub-common", .data = &mtk_smi_sub_common_mt8188},
{.compatible = "mediatek,mt8192-smi-common", .data = &mtk_smi_common_mt8192},
{.compatible = "mediatek,mt8195-smi-common-vdo", .data = &mtk_smi_common_mt8195_vdo},
{.compatible = "mediatek,mt8195-smi-common-vpp", .data = &mtk_smi_common_mt8195_vpp},
--
2.46.0
