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From: Rouven Czerwinski <r.czerwinski@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Rouven Czerwinski <r.czerwinski@pengutronix.de>
Subject: [PATCH 3/5] nvmem: ocotp: add new timing function for i.MX7
Date: Wed, 15 Jul 2020 07:56:06 +0200	[thread overview]
Message-ID: <20200715055608.20993-3-r.czerwinski@pengutronix.de> (raw)
In-Reply-To: <20200715055608.20993-1-r.czerwinski@pengutronix.de>

Ported from the linux kernel.

Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
---
 drivers/nvmem/ocotp.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/nvmem/ocotp.c b/drivers/nvmem/ocotp.c
index 3f475e5b1f..1b842ec0ed 100644
--- a/drivers/nvmem/ocotp.c
+++ b/drivers/nvmem/ocotp.c
@@ -48,6 +48,9 @@
 #define OCOTP_READ_CTRL			0x30
 #define OCOTP_READ_FUSE_DATA		0x40
 
+#define DEF_FSOURCE			1001	/* > 1000 ns */
+#define DEF_STROBE_PROG			10000	/* IPG clocks */
+
 /* OCOTP Registers bits and masks */
 #define OCOTP_CTRL_WR_UNLOCK		16
 #define OCOTP_CTRL_WR_UNLOCK_KEY	0x3E77
@@ -171,6 +174,27 @@ static int imx6_ocotp_set_timing(struct ocotp_priv *priv)
 	return 0;
 }
 
+static int imx7_ocotp_set_timing(struct ocotp_priv *priv)
+{
+	unsigned long clk_rate;
+	u64 fsource, strobe_prog;
+	u32 timing;
+
+	clk_rate = clk_get_rate(priv->clk);
+
+	fsource = DIV_ROUND_UP_ULL((u64)clk_rate * DEF_FSOURCE,
+				   NSEC_PER_SEC) + 1;
+	strobe_prog = DIV_ROUND_CLOSEST_ULL((u64)clk_rate * DEF_STROBE_PROG,
+					    NSEC_PER_SEC) + 1;
+
+	timing = strobe_prog & 0x00000FFF;
+	timing |= (fsource << 12) & 0x000FF000;
+
+	writel(timing, priv->base + OCOTP_TIMING);
+
+	return 0;
+}
+
 static int imx6_ocotp_wait_busy(struct ocotp_priv *priv, u32 flags)
 {
 	uint64_t start = get_time_ns();
-- 
2.27.0


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  parent reply	other threads:[~2020-07-15  5:56 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-15  5:56 [PATCH 1/5] clk: imx7: add IMX7D_OCOTP_CLK Rouven Czerwinski
2020-07-15  5:56 ` [PATCH 2/5] nvmem: ocotp: retrieve set_timing from structure Rouven Czerwinski
2020-07-15  5:56 ` Rouven Czerwinski [this message]
2020-07-15  5:56 ` [PATCH 4/5] nvmem: ocotp: read/write i.MX7 support Rouven Czerwinski
2020-07-15  5:56 ` [PATCH 5/5] nvmem: enable OCOTP for i.MX7 Rouven Czerwinski
2020-08-10 19:54 ` [PATCH 1/5] clk: imx7: add IMX7D_OCOTP_CLK Sascha Hauer

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