Implement read and write support for the banked access on i.MX7.
Signed-off-by: Rouven Czerwinski <r.czerwinski@xxxxxxxxxxxxxx>
---
drivers/nvmem/ocotp.c | 147 ++++++++++++++++++++++++++++++++++++++++--
1 file changed, 141 insertions(+), 6 deletions(-)
diff --git a/drivers/nvmem/ocotp.c b/drivers/nvmem/ocotp.c
index 1b842ec0ed..7081eb5479 100644
--- a/drivers/nvmem/ocotp.c
+++ b/drivers/nvmem/ocotp.c
@@ -48,6 +48,16 @@
#define OCOTP_READ_CTRL 0x30
#define OCOTP_READ_FUSE_DATA 0x40
+#define MX7_OCOTP_DATA0 0x20
+#define MX7_OCOTP_DATA1 0x30
+#define MX7_OCOTP_DATA2 0x40
+#define MX7_OCOTP_DATA3 0x50
+#define MX7_OCOTP_READ_CTRL 0x60
+#define MX7_OCOTP_READ_FUSE_DATA0 0x70
+#define MX7_OCOTP_READ_FUSE_DATA1 0x80
+#define MX7_OCOTP_READ_FUSE_DATA2 0x90
+#define MX7_OCOTP_READ_FUSE_DATA3 0xA0
+
#define DEF_FSOURCE 1001 /* > 1000 ns */
#define DEF_STROBE_PROG 10000 /* IPG clocks */
@@ -97,6 +107,8 @@ struct imx_ocotp_data {
void (*format_mac)(u8 *dst, const u8 *src,
enum imx_ocotp_format_mac_direction dir);
int (*set_timing)(struct ocotp_priv *priv);
+ int (*fuse_read)(struct ocotp_priv *priv, u32 addr, u32 *pdata);
+ int (*fuse_blow)(struct ocotp_priv *priv, u32 addr, u32 value);
u8 mac_offsets[MAX_MAC_OFFSETS];
u8 mac_offsets_num;
};
@@ -221,7 +233,7 @@ static int imx6_ocotp_prepare(struct ocotp_priv *priv)
return 0;
}
-static int fuse_read_addr(struct ocotp_priv *priv, u32 addr, u32 *pdata)
+static int imx6_fuse_read_addr(struct ocotp_priv *priv, u32 addr, u32 *pdata)
{
u32 ctrl_reg;
int ret;
@@ -247,6 +259,50 @@ static int fuse_read_addr(struct ocotp_priv *priv, u32 addr, u32 *pdata)
return 0;
}
+static int imx7_fuse_read_addr(struct ocotp_priv *priv, u32 index, u32 *pdata)
+{
+ u32 ctrl_reg;
+ u32 bank_addr;
+ u16 word;
+ int ret;
+
+ word = index & 0x3;
+ bank_addr = index >> 2;
+
+ writel(OCOTP_CTRL_ERROR, priv->base + OCOTP_CTRL_CLR);
+
+ ctrl_reg = readl(priv->base + OCOTP_CTRL);
+ ctrl_reg &= ~OCOTP_CTRL_ADDR_MASK;
+ ctrl_reg &= ~OCOTP_CTRL_WR_UNLOCK_MASK;
+ ctrl_reg |= BF(bank_addr, OCOTP_CTRL_ADDR);
+ writel(ctrl_reg, priv->base + OCOTP_CTRL);
+
+ writel(OCOTP_READ_CTRL_READ_FUSE, priv->base + MX7_OCOTP_READ_CTRL);
+ ret = imx6_ocotp_wait_busy(priv, 0);
+ if (ret)
+ return ret;
+
+ if (readl(priv->base + OCOTP_CTRL) & OCOTP_CTRL_ERROR)
+ *pdata = 0xbadabada;
+ else
+ switch (word) {
+ case 0:
+ *pdata = readl(priv->base + MX7_OCOTP_READ_FUSE_DATA0);
+ break;
+ case 1:
+ *pdata = readl(priv->base + MX7_OCOTP_READ_FUSE_DATA1);
+ break;
+ case 2:
+ *pdata = readl(priv->base + MX7_OCOTP_READ_FUSE_DATA2);
+ break;
+ case 3:
+ *pdata = readl(priv->base + MX7_OCOTP_READ_FUSE_DATA2);
+ break;
+ }
+
+ return 0;
+}
+
static int imx6_ocotp_read_one_u32(struct ocotp_priv *priv, u32 index, u32 *pdata)
{
int ret;
@@ -258,7 +314,7 @@ static int imx6_ocotp_read_one_u32(struct ocotp_priv *priv, u32 index, u32 *pdat
return ret;
}
- ret = fuse_read_addr(priv, index, pdata);
+ ret = priv->data->fuse_read(priv, index, pdata);
if (ret) {
dev_err(&priv->dev, "failed to read fuse 0x%08x\n", index);
return ret;
@@ -287,19 +343,27 @@ static int imx_ocotp_reg_read(void *ctx, unsigned int reg, unsigned int *val)
return 0;
}
-static int fuse_blow_addr(struct ocotp_priv *priv, u32 addr, u32 value)
+static void imx_ocotp_clear_unlock(struct ocotp_priv *priv, u32 index)
{
u32 ctrl_reg;
- int ret;
writel(OCOTP_CTRL_ERROR, priv->base + OCOTP_CTRL_CLR);
/* Control register */
ctrl_reg = readl(priv->base + OCOTP_CTRL);
ctrl_reg &= ~OCOTP_CTRL_ADDR_MASK;
- ctrl_reg |= BF(addr, OCOTP_CTRL_ADDR);
+ ctrl_reg |= BF(index, OCOTP_CTRL_ADDR);
ctrl_reg |= BF(OCOTP_CTRL_WR_UNLOCK_KEY, OCOTP_CTRL_WR_UNLOCK);
writel(ctrl_reg, priv->base + OCOTP_CTRL);
+}
+
+static int imx6_fuse_blow_addr(struct ocotp_priv *priv, u32 index, u32 value)
+{
+ int ret;
+
+ imx_ocotp_clear_unlock(priv, index);
+
+ writel(OCOTP_CTRL_ERROR, priv->base + OCOTP_CTRL_CLR);
writel(value, priv->base + OCOTP_DATA);
ret = imx6_ocotp_wait_busy(priv, 0);
@@ -311,6 +375,53 @@ static int fuse_blow_addr(struct ocotp_priv *priv, u32 addr, u32 value)
return 0;
}
+static int imx7_fuse_blow_addr(struct ocotp_priv *priv, u32 index, u32 value)
+{
+ int ret;
+ int word;
+ int bank_addr;
+
+ bank_addr = index >> 2;
+ word = index & 0x3;
+
+ imx_ocotp_clear_unlock(priv, bank_addr);
+
+ switch(word) {
+ case 0:
+ writel(0, priv->base + MX7_OCOTP_DATA1);
+ writel(0, priv->base + MX7_OCOTP_DATA2);
+ writel(0, priv->base + MX7_OCOTP_DATA3);
+ writel(value, priv->base + MX7_OCOTP_DATA0);
+ break;
+ case 1:
+ writel(value, priv->base + MX7_OCOTP_DATA1);
+ writel(0, priv->base + MX7_OCOTP_DATA2);
+ writel(0, priv->base + MX7_OCOTP_DATA3);
+ writel(0, priv->base + MX7_OCOTP_DATA0);
+ break;
+ case 2:
+ writel(value, priv->base + MX7_OCOTP_DATA2);
+ writel(0, priv->base + MX7_OCOTP_DATA3);
+ writel(0, priv->base + MX7_OCOTP_DATA1);
+ writel(0, priv->base + MX7_OCOTP_DATA0);
+ break;
+ case 3:
+ writel(value, priv->base + MX7_OCOTP_DATA3);
+ writel(0, priv->base + MX7_OCOTP_DATA1);
+ writel(0, priv->base + MX7_OCOTP_DATA2);
+ writel(0, priv->base + MX7_OCOTP_DATA0);
+ break;
+ }
+
+ ret = imx6_ocotp_wait_busy(priv, 0);
+ if (ret)
+ return ret;
+
+ /* Write postamble */
+ udelay(2000);
+ return 0;
+}
+
static int imx6_ocotp_reload_shadow(struct ocotp_priv *priv)
{
dev_info(&priv->dev, "reloading shadow registers...\n");
@@ -331,7 +442,7 @@ static int imx6_ocotp_blow_one_u32(struct ocotp_priv *priv, u32 index, u32 data,
return ret;
}
- ret = fuse_blow_addr(priv, index, data);
+ ret = priv->data->fuse_blow(priv, index, data);
if (ret) {
dev_err(&priv->dev, "fuse blow failed\n");
return ret;
@@ -731,6 +842,8 @@ static struct imx_ocotp_data imx6sl_ocotp_data = {
.mac_offsets = { MAC_OFFSET_0 },
.format_mac = imx_ocotp_format_mac,
.set_timing = imx6_ocotp_set_timing,
+ .fuse_blow = imx6_fuse_blow_addr,
+ .fuse_read = imx6_fuse_read_addr,
};
static struct imx_ocotp_data imx6ul_ocotp_data = {
@@ -740,6 +853,8 @@ static struct imx_ocotp_data imx6ul_ocotp_data = {
.mac_offsets = { MAC_OFFSET_0, IMX6UL_MAC_OFFSET_1 },
.format_mac = imx_ocotp_format_mac,
.set_timing = imx6_ocotp_set_timing,
+ .fuse_blow = imx6_fuse_blow_addr,
+ .fuse_read = imx6_fuse_read_addr,
};
static struct imx_ocotp_data imx6ull_ocotp_data = {
@@ -749,6 +864,8 @@ static struct imx_ocotp_data imx6ull_ocotp_data = {
.mac_offsets = { MAC_OFFSET_0, IMX6UL_MAC_OFFSET_1 },
.format_mac = imx_ocotp_format_mac,
.set_timing = imx6_ocotp_set_timing,
+ .fuse_blow = imx6_fuse_blow_addr,
+ .fuse_read = imx6_fuse_read_addr,
};
static struct imx_ocotp_data vf610_ocotp_data = {
@@ -758,6 +875,8 @@ static struct imx_ocotp_data vf610_ocotp_data = {
.mac_offsets = { MAC_OFFSET_0, MAC_OFFSET_1 },
.format_mac = vf610_ocotp_format_mac,
.set_timing = imx6_ocotp_set_timing,
+ .fuse_blow = imx6_fuse_blow_addr,
+ .fuse_read = imx6_fuse_read_addr,
};
static struct imx_ocotp_data imx8mq_ocotp_data = {
@@ -767,6 +886,19 @@ static struct imx_ocotp_data imx8mq_ocotp_data = {
.mac_offsets = { 0x90 },
.format_mac = imx_ocotp_format_mac,
.set_timing = imx6_ocotp_set_timing,
+ .fuse_blow = imx6_fuse_blow_addr,
+ .fuse_read = imx6_fuse_read_addr,
+};
+
+static struct imx_ocotp_data imx7d_ocotp_data = {
+ .num_regs = 2048,
+ .addr_to_offset = imx6sl_addr_to_offset,
+ .mac_offsets_num = 1,
+ .mac_offsets = { MAC_OFFSET_0, IMX6UL_MAC_OFFSET_1 },
+ .format_mac = imx_ocotp_format_mac,
+ .set_timing = imx7_ocotp_set_timing,
+ .fuse_blow = imx7_fuse_blow_addr,
+ .fuse_read = imx7_fuse_read_addr,
};
static __maybe_unused struct of_device_id imx_ocotp_dt_ids[] = {
@@ -785,6 +917,9 @@ static __maybe_unused struct of_device_id imx_ocotp_dt_ids[] = {
}, {
.compatible = "fsl,imx6ull-ocotp",
.data = &imx6ull_ocotp_data,
+ }, {
+ .compatible = "fsl,imx7d-ocotp",
+ .data = &imx7d_ocotp_data,
}, {
.compatible = "fsl,imx8mq-ocotp",
.data = &imx8mq_ocotp_data,
--
2.27.0
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