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Message-Id: <1507502482-22518-6-git-send-email-pure.logic@nexus-software.ie>
Date: Sun, 8 Oct 2017 23:41:20 +0100
From: Bryan O'Donoghue <pure.logic@...us-software.ie>
To: p.zabel@...gutronix.de, richard.leitner@...data.com,
srinivas.kandagatla@...aro.org, axel.lin@...ics.com,
ping.bai@....com, d.schultz@...tec.de, peng.fan@....com,
van.freenix@...il.com
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Bryan O'Donoghue <pure.logic@...us-software.ie>
Subject: [PATCH v2 5/7] nvmem: imx-ocotp: Add i.MX7D timing write clock setup support
This patch adds logic to correctly setup the write timing parameters
when blowing an OTP fuse for the i.MX7S/D.
Fixes: 0642bac7da42 ("nvmem: imx-ocotp: add write support")
Signed-off-by: Bryan O'Donoghue <pure.logic@...us-software.ie>
---
drivers/nvmem/imx-ocotp.c | 65 ++++++++++++++++++++++++++++++++++++++---------
1 file changed, 53 insertions(+), 12 deletions(-)
diff --git a/drivers/nvmem/imx-ocotp.c b/drivers/nvmem/imx-ocotp.c
index 74c2f15..f80aee9 100644
--- a/drivers/nvmem/imx-ocotp.c
+++ b/drivers/nvmem/imx-ocotp.c
@@ -51,16 +51,12 @@
#define IMX_OCOTP_BM_CTRL_REL_SHADOWS 0x00000400
#define DEF_RELAX 20 /* > 16.5ns */
+#define DEF_FSOURCE 1001
#define IMX_OCOTP_WR_UNLOCK 0x3E770000
#define IMX_OCOTP_READ_LOCKED_VAL 0xBADABADA
static DEFINE_MUTEX(ocotp_mutex);
-struct ocotp_params {
- unsigned int nregs;
- unsigned int bank_address_words;
-};
-
struct ocotp_priv {
struct device *dev;
struct clk *clk;
@@ -69,6 +65,12 @@ struct ocotp_priv {
struct nvmem_config *config;
};
+struct ocotp_params {
+ unsigned int nregs;
+ unsigned int bank_address_words;
+ void (*set_timing)(struct ocotp_priv *priv);
+};
+
static int imx_ocotp_wait_for_busy(void __iomem *base, u32 flags)
{
int count;
@@ -193,6 +195,25 @@ static void imx_ocotp_set_imx6_timing(struct ocotp_priv *priv)
writel(timing, priv->base + IMX_OCOTP_ADDR_TIMING);
}
+static void imx_ocotp_set_imx7_timing(struct ocotp_priv *priv)
+{
+ unsigned long clk_rate = 0;
+ unsigned long fsource, strobe_prog;
+ u32 timing = 0;
+
+ /* i.MX 7Solo Applications Processor Reference Manual, Rev. 0.1
+ * 6.4.3.3
+ */
+ clk_rate = clk_get_rate(priv->clk);
+ fsource = DIV_ROUND_UP(((clk_rate / 1000) * DEF_FSOURCE), 1000000) + 1;
+ strobe_prog = ((clk_rate * 10) / 1000000) + 1;
+
+ timing = strobe_prog & 0x00000FFF;
+ timing |= (fsource << 12) & 0x000FF000;
+
+ writel(timing, priv->base + IMX_OCOTP_ADDR_TIMING);
+}
+
static int imx_ocotp_write(void *context, unsigned int offset, void *val,
size_t bytes)
{
@@ -219,7 +240,7 @@ static int imx_ocotp_write(void *context, unsigned int offset, void *val,
}
/* Setup the write timing values */
- imx_ocotp_set_imx6_timing(priv);
+ priv->params->set_timing(priv);
/* 47.3.1.3.2
* Check that HW_OCOTP_CTRL[BUSY] and HW_OCOTP_CTRL[ERROR] are clear.
@@ -371,12 +392,32 @@ static struct nvmem_config imx_ocotp_nvmem_config = {
.reg_write = imx_ocotp_write,
};
-static const struct octop_params params[] = {
- { .nregs = 128, .bank_address_words = 0 },
- { .nregs = 64, .bank_address_words = 0 },
- { .nregs = 128, .bank_address_words = 0 },
- { .nregs = 128, .bank_address_words = 0 },
- { .nregs = 64, .bank_address_words = 4 },
+static const struct ocotp_params params[] = {
+ {
+ .nregs = 128,
+ .bank_address_words = 0,
+ .set_timing = imx_ocotp_set_imx6_timing,
+ },
+ {
+ .nregs = 64,
+ .bank_address_words = 0,
+ .set_timing = imx_ocotp_set_imx6_timing,
+ },
+ {
+ .nregs = 128,
+ .bank_address_words = 0,
+ .set_timing = imx_ocotp_set_imx6_timing,
+ },
+ {
+ .nregs = 128,
+ .bank_address_words = 0,
+ .set_timing = imx_ocotp_set_imx6_timing,
+ },
+ {
+ .nregs = 64,
+ .bank_address_words = 4,
+ .set_timing = imx_ocotp_set_imx7_timing,
+ },
};
static const struct of_device_id imx_ocotp_dt_ids[] = {
--
2.7.4
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