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nvmem: imx-ocotp: Add support for banked OTP addressing

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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: 0642bac7da ("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>
This commit is contained in:
Bryan O'Donoghue 2017-10-24 10:54:29 +01:00 committed by Greg Kroah-Hartman
parent e20d2b291b
commit ffd9115f65
1 changed files with 64 additions and 4 deletions
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68
drivers/nvmem/imx-ocotp.c
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@ -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[] = {