[PATCH v2 2/4] i3c: master: svc: Add support for Nuvoton npcm845 i3c

[Stanley Chu <stanley.chuys@gmail.com>]

Nuvoton npcm845 SoC uses the same Silvico IP but an older version.
Add npcm845 specific quirks.

Signed-off-by: Stanley Chu <yschu@nuvoton.com>
---
 drivers/i3c/master/svc-i3c-master.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
index d6057d8c7dec..c58440061d5a 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -133,6 +133,22 @@
 #define SVC_I3C_EVENT_IBI	GENMASK(7, 0)
 #define SVC_I3C_EVENT_HOTJOIN	BIT(31)
 
+/*
+ * SVC_I3C_QUIRK_FIFO_EMPTY:
+ * I3C HW stalls the write transfer if the transmit FIFO becomes empty,
+ * when new data is written to FIFO, I3C HW resumes the transfer but
+ * the first transmitted data bit may have the wrong value.
+ * Workaround:
+ * Fill the FIFO in advance to prevent FIFO from becoming empty.
+ */
+#define SVC_I3C_QUIRK_FIFO_EMPTY	BIT(0)
+/*
+ * SVC_I3C_QUIRK_FLASE_SLVSTART:
+ * I3C HW may generate an invalid SlvStart event when emitting a STOP.
+ * If it is a true SlvStart, the MSTATUS state should be SLVREQ.
+ */
+#define SVC_I3C_QUIRK_FALSE_SLVSTART	BIT(1)
+
 struct svc_i3c_cmd {
 	u8 addr;
 	bool rnw;
@@ -216,6 +232,7 @@ struct svc_i3c_master {
 	struct mutex lock;
 	u32 enabled_events;
 	u32 mctrl_config;
+	u32 quirks;
 };
 
 /**
@@ -230,6 +247,14 @@ struct svc_i3c_i2c_dev_data {
 	struct i3c_generic_ibi_pool *ibi_pool;
 };
 
+struct svc_i3c_drvdata {
+	u32 quirks;
+};
+
+const struct svc_i3c_drvdata npcm845_drvdata = {
+	.quirks = SVC_I3C_QUIRK_FIFO_EMPTY | SVC_I3C_QUIRK_FALSE_SLVSTART,
+};
+
 static inline bool is_events_enabled(struct svc_i3c_master *master, u32 mask)
 {
 	return !!(master->enabled_events & mask);
@@ -1811,6 +1836,7 @@ static int svc_i3c_master_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct svc_i3c_master *master;
+	const struct svc_i3c_drvdata *data = of_device_get_match_data(dev);
 	int ret;
 
 	master = devm_kzalloc(dev, sizeof(*master), GFP_KERNEL);
@@ -1868,6 +1894,8 @@ static int svc_i3c_master_probe(struct platform_device *pdev)
 	}
 
 	platform_set_drvdata(pdev, master);
+	if (data)
+		master->quirks = data->quirks;
 
 	pm_runtime_set_autosuspend_delay(&pdev->dev, SVC_I3C_PM_TIMEOUT_MS);
 	pm_runtime_use_autosuspend(&pdev->dev);
@@ -1960,6 +1988,7 @@ static const struct dev_pm_ops svc_i3c_pm_ops = {
 
 static const struct of_device_id svc_i3c_master_of_match_tbl[] = {
 	{ .compatible = "silvaco,i3c-master-v1"},
+	{ .compatible = "nuvoton,npcm845-i3c", .data = &npcm845_drvdata },
 	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, svc_i3c_master_of_match_tbl);
-- 
2.34.1


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