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authorBryan O'Donoghue <pure.logic@nexus-software.ie>2017-10-24 10:54:29 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-11-08 14:19:05 +0100
commitffd9115f6548c51d347489e76bfb7d10e728f43d (patch)
treefca055d4b4e8d1ccb93c29c6633bc283c698aeef /drivers/nvmem
parente20d2b291ba2f5441fd4aacd746c21e60d48b559 (diff)
nvmem: imx-ocotp: Add support for banked OTP addressing
The i.MX7S/D takes the bank address in the CTRLn.ADDR field and the data value in one of the DATAx {0, 1, 2, 3} register fields. The current write routine is based on writing the CTRLn.ADDR field and writing a single DATA register only. Fixes: 0642bac7da42 ("nvmem: imx-ocotp: add write support") Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvmem')
-rw-r--r--drivers/nvmem/imx-ocotp.c68
1 files changed, 64 insertions, 4 deletions
diff --git a/drivers/nvmem/imx-ocotp.c b/drivers/nvmem/imx-ocotp.c
index d94ed2d69a10..bf95a0ecd0dc 100644
--- a/drivers/nvmem/imx-ocotp.c
+++ b/drivers/nvmem/imx-ocotp.c
@@ -40,7 +40,10 @@
#define IMX_OCOTP_ADDR_CTRL_SET 0x0004
#define IMX_OCOTP_ADDR_CTRL_CLR 0x0008
#define IMX_OCOTP_ADDR_TIMING 0x0010
-#define IMX_OCOTP_ADDR_DATA 0x0020
+#define IMX_OCOTP_ADDR_DATA0 0x0020
+#define IMX_OCOTP_ADDR_DATA1 0x0030
+#define IMX_OCOTP_ADDR_DATA2 0x0040
+#define IMX_OCOTP_ADDR_DATA3 0x0050
#define IMX_OCOTP_BM_CTRL_ADDR 0x0000007F
#define IMX_OCOTP_BM_CTRL_BUSY 0x00000100
@@ -55,6 +58,7 @@ static DEFINE_MUTEX(ocotp_mutex);
struct ocotp_params {
unsigned int nregs;
+ unsigned int bank_address_words;
};
struct ocotp_priv {
@@ -176,6 +180,7 @@ static int imx_ocotp_write(void *context, unsigned int offset, void *val,
u32 timing = 0;
u32 ctrl;
u8 waddr;
+ u8 word = 0;
/* allow only writing one complete OTP word at a time */
if ((bytes != priv->config->word_size) ||
@@ -228,8 +233,23 @@ static int imx_ocotp_write(void *context, unsigned int offset, void *val,
* description. Both the unlock code and address can be written in the
* same operation.
*/
- /* OTP write/read address specifies one of 128 word address locations */
- waddr = offset / 4;
+ if (priv->params->bank_address_words != 0) {
+ /*
+ * In banked/i.MX7 mode the OTP register bank goes into waddr
+ * see i.MX 7Solo Applications Processor Reference Manual, Rev.
+ * 0.1 section 6.4.3.1
+ */
+ offset = offset / priv->config->word_size;
+ waddr = offset / priv->params->bank_address_words;
+ word = offset & (priv->params->bank_address_words - 1);
+ } else {
+ /*
+ * Non-banked i.MX6 mode.
+ * OTP write/read address specifies one of 128 word address
+ * locations
+ */
+ waddr = offset / 4;
+ }
ctrl = readl(priv->base + IMX_OCOTP_ADDR_CTRL);
ctrl &= ~IMX_OCOTP_BM_CTRL_ADDR;
@@ -255,8 +275,43 @@ static int imx_ocotp_write(void *context, unsigned int offset, void *val,
* shift right (with zero fill). This shifting is required to program
* the OTP serially. During the write operation, HW_OCOTP_DATA cannot be
* modified.
+ * Note: on i.MX7 there are four data fields to write for banked write
+ * with the fuse blowing operation only taking place after data0
+ * has been written. This is why data0 must always be the last
+ * register written.
*/
- writel(*buf, priv->base + IMX_OCOTP_ADDR_DATA);
+ if (priv->params->bank_address_words != 0) {
+ /* Banked/i.MX7 mode */
+ switch (word) {
+ case 0:
+ writel(0, priv->base + IMX_OCOTP_ADDR_DATA1);
+ writel(0, priv->base + IMX_OCOTP_ADDR_DATA2);
+ writel(0, priv->base + IMX_OCOTP_ADDR_DATA3);
+ writel(*buf, priv->base + IMX_OCOTP_ADDR_DATA0);
+ break;
+ case 1:
+ writel(*buf, priv->base + IMX_OCOTP_ADDR_DATA1);
+ writel(0, priv->base + IMX_OCOTP_ADDR_DATA2);
+ writel(0, priv->base + IMX_OCOTP_ADDR_DATA3);
+ writel(0, priv->base + IMX_OCOTP_ADDR_DATA0);
+ break;
+ case 2:
+ writel(0, priv->base + IMX_OCOTP_ADDR_DATA1);
+ writel(*buf, priv->base + IMX_OCOTP_ADDR_DATA2);
+ writel(0, priv->base + IMX_OCOTP_ADDR_DATA3);
+ writel(0, priv->base + IMX_OCOTP_ADDR_DATA0);
+ break;
+ case 3:
+ writel(0, priv->base + IMX_OCOTP_ADDR_DATA1);
+ writel(0, priv->base + IMX_OCOTP_ADDR_DATA2);
+ writel(*buf, priv->base + IMX_OCOTP_ADDR_DATA3);
+ writel(0, priv->base + IMX_OCOTP_ADDR_DATA0);
+ break;
+ }
+ } else {
+ /* Non-banked i.MX6 mode */
+ writel(*buf, priv->base + IMX_OCOTP_ADDR_DATA0);
+ }
/* 47.4.1.4.5
* Once complete, the controller will clear BUSY. A write request to a
@@ -313,22 +368,27 @@ static struct nvmem_config imx_ocotp_nvmem_config = {
static const struct ocotp_params imx6q_params = {
.nregs = 128,
+ .bank_address_words = 0,
};
static const struct ocotp_params imx6sl_params = {
.nregs = 64,
+ .bank_address_words = 0,
};
static const struct ocotp_params imx6sx_params = {
.nregs = 128,
+ .bank_address_words = 0,
};
static const struct ocotp_params imx6ul_params = {
.nregs = 128,
+ .bank_address_words = 0,
};
static const struct ocotp_params imx7d_params = {
.nregs = 64,
+ .bank_address_words = 4,
};
static const struct of_device_id imx_ocotp_dt_ids[] = {

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