From: "friday.yang" <friday.yang@xxxxxxxxxxxx>
To prevent handling glitch signals during MTCMOS on/off transitions,
SMI requires clamp and reset operations. Parse the reset settings for
SMI LARBs and the clamp settings for the SMI Sub-Common. Register
genpd callback for the SMI LARBs located in image, camera and IPE
subsystems, and apply reset and clamp operations within the callback.
Signed-off-by: Friday Yang <friday.yang@xxxxxxxxxxxx>
---
drivers/memory/mtk-smi.c | 141 +++++++++++++++++++++++++++++++++++++--
1 file changed, 137 insertions(+), 4 deletions(-)
diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
index 5710348f72f6..aaeb80379ec1 100644
--- a/drivers/memory/mtk-smi.c
+++ b/drivers/memory/mtk-smi.c
@@ -10,11 +10,15 @@
#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/soc/mediatek/mtk_sip_svc.h>
#include <soc/mediatek/smi.h>
#include <dt-bindings/memory/mt2701-larb-port.h>
@@ -36,6 +40,12 @@
#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_SUB_COMM_INPORT_NR (8)
+
/* SMI LARB */
#define SMI_LARB_SLP_CON 0xc
#define SLP_PROT_EN BIT(0)
@@ -134,6 +144,7 @@ struct mtk_smi_larb_gen {
unsigned int larb_direct_to_common_mask;
unsigned int flags_general;
const u8 (*ostd)[SMI_LARB_PORT_NR_MAX];
+ const u8 *clamp_port;
};
struct mtk_smi {
@@ -150,6 +161,7 @@ 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 +169,10 @@ struct mtk_smi_larb { /* larb: local arbiter */
int larbid;
u32 *mmu;
unsigned char *bank;
+ struct regmap *sub_comm_syscon;
+ u8 sub_comm_inport;
+ struct notifier_block nb;
+ struct reset_control *rst_con;
};
static int
@@ -377,6 +393,19 @@ static const u8 mtk_smi_larb_mt8195_ostd[][SMI_LARB_PORT_NR_MAX] = {
[28] = {0x1a, 0x0e, 0x0a, 0x0a, 0x0c, 0x0e, 0x10,},
};
+static const u8 mtk_smi_larb_clamp_port_mt8188[MTK_LARB_NR_MAX] = {
+ [9] = BIT(1), /* larb10 */
+ [10] = BIT(2), /* larb11a */
+ [11] = BIT(2), /* larb11b */
+ [12] = BIT(3), /* larb11c */
+ [13] = BIT(0), /* larb12 */
+ [16] = BIT(1), /* larb15 */
+ [17] = BIT(2), /* larb16a */
+ [18] = BIT(2), /* larb16b */
+ [19] = BIT(3), /* larb17a */
+ [20] = BIT(3), /* larb17b */
+};
+
static const struct mtk_smi_larb_gen mtk_smi_larb_mt2701 = {
.port_in_larb = {
LARB0_PORT_OFFSET, LARB1_PORT_OFFSET,
@@ -423,6 +452,7 @@ static const struct mtk_smi_larb_gen mtk_smi_larb_mt8188 = {
.flags_general = MTK_SMI_FLAG_THRT_UPDATE | MTK_SMI_FLAG_SW_FLAG |
MTK_SMI_FLAG_SLEEP_CTL | MTK_SMI_FLAG_CFG_PORT_SEC_CTL,
.ostd = mtk_smi_larb_mt8188_ostd,
+ .clamp_port = mtk_smi_larb_clamp_port_mt8188,
};
static const struct mtk_smi_larb_gen mtk_smi_larb_mt8192 = {
@@ -472,6 +502,46 @@ 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, bool enable)
+{
+ struct mtk_smi_larb *larb = dev_get_drvdata(dev);
+ u32 reg;
+ int ret;
+
+ /* sub_comm_syscon could be NULL if larb directly linked to SMI common */
+ if (!larb->sub_comm_syscon)
+ return -EINVAL;
+
+ reg = enable ? SMI_COMMON_CLAMP_EN_SET : SMI_COMMON_CLAMP_EN_CLR;
+
+ ret = regmap_write(larb->sub_comm_syscon, reg,
+ larb->sub_comm_inport);
+ if (ret)
+ dev_err(dev, "Unable to %s clamp for input port %d: %d\n",
+ enable ? "enable" : "disable",
+ 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, true);
+ } else if (flags == GENPD_NOTIFY_ON) {
+ /* enable related SMI sub-common port */
+ reset_control_reset(larb->rst_con);
+ mtk_smi_larb_clamp_protect_enable(dev, false);
+ }
+
+ 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 +598,53 @@ static int mtk_smi_dts_clk_init(struct device *dev, struct mtk_smi *smi,
return ret;
}
+static int mtk_smi_larb_parse_clamp_optional(struct mtk_smi_larb *larb)
+{
+ struct device *dev = larb->dev;
+ const struct mtk_smi_larb_gen *larb_gen = larb->larb_gen;
+ u32 larb_id;
+ int ret;
+
+ /**
+ * Only SMI LARBs in camera, image and IPE subsys need to
+ * apply clamp and reset operations, others can be skipped.
+ */
+ ret = of_property_read_u32(dev->of_node, "mediatek,larb-id", &larb_id);
+ if (ret)
+ return -EINVAL;
+ if (!larb_gen->clamp_port || !larb_gen->clamp_port[larb_id])
+ return 0;
+
+ larb->sub_comm_inport = larb_gen->clamp_port[larb_id];
+ larb->sub_comm_syscon = syscon_regmap_lookup_by_phandle(dev->of_node, "mediatek,smi");
+ if (IS_ERR(larb->sub_comm_syscon)) {
+ larb->sub_comm_syscon = NULL;
+ return dev_err_probe(dev, -EINVAL,
+ "Unknown clamp port for larb %d\n", larb_id);
+ }
+
+ return 0;
+}
+
+static int mtk_smi_larb_parse_reset_optional(struct mtk_smi_larb *larb)
+{
+ struct device *dev = larb->dev;
+ int ret;
+
+ larb->rst_con = devm_reset_control_get(dev, "larb");
+ if (IS_ERR(larb->rst_con))
+ return dev_err_probe(dev, PTR_ERR(larb->rst_con),
+ "Failed to get larb reset controller\n");
+
+ larb->nb.notifier_call = mtk_smi_genpd_callback;
+ ret = dev_pm_genpd_add_notifier(dev, &larb->nb);
+ if (ret)
+ return dev_err_probe(dev, -EINVAL,
+ "Failed to add genpd callback %d\n", ret);
+
+ return 0;
+}
+
static int mtk_smi_larb_probe(struct platform_device *pdev)
{
struct mtk_smi_larb *larb;
@@ -538,6 +655,7 @@ 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 +672,24 @@ static int mtk_smi_larb_probe(struct platform_device *pdev)
if (ret < 0)
return ret;
- pm_runtime_enable(dev);
+ ret = mtk_smi_larb_parse_clamp_optional(larb);
+ if (ret)
+ goto err_link_remove;
+
+ ret = mtk_smi_larb_parse_reset_optional(larb);
+ if (ret && ret != -ENOENT)
+ goto err_link_remove;
+
platform_set_drvdata(pdev, larb);
ret = component_add(dev, &mtk_smi_larb_component_ops);
if (ret)
- goto err_pm_disable;
+ goto err_link_remove;
+
+ pm_runtime_enable(dev);
+
return 0;
-err_pm_disable:
- pm_runtime_disable(dev);
+err_link_remove:
device_link_remove(dev, larb->smi_common_dev);
return ret;
}
@@ -686,6 +813,11 @@ 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,
+ .has_gals = true,
+};
+
static const struct mtk_smi_common_plat mtk_smi_common_mt8192 = {
.type = MTK_SMI_GEN2,
.has_gals = true,
@@ -729,6 +861,7 @@ 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
