diff options
Diffstat (limited to 'drivers/nvmem')
| -rw-r--r-- | drivers/nvmem/imx-ocotp.c | 30 |
1 files changed, 24 insertions, 6 deletions
diff --git a/drivers/nvmem/imx-ocotp.c b/drivers/nvmem/imx-ocotp.c index 7a1ebd6fd08b..08f41328cc71 100644 --- a/drivers/nvmem/imx-ocotp.c +++ b/drivers/nvmem/imx-ocotp.c @@ -4,6 +4,8 @@ * * Copyright (c) 2015 Pengutronix, Philipp Zabel <p.zabel@pengutronix.de> * + * Copyright 2019 NXP + * * Based on the barebox ocotp driver, * Copyright (c) 2010 Baruch Siach <baruch@tkos.co.il>, * Orex Computed Radiography @@ -158,22 +160,30 @@ static int imx_ocotp_read(void *context, unsigned int offset, { struct ocotp_priv *priv = context; unsigned int count; - u32 *buf = val; + u8 *buf, *p; int i, ret; - u32 index; + u32 index, num_bytes; index = offset >> 2; - count = bytes >> 2; + num_bytes = round_up((offset % 4) + bytes, 4); + count = num_bytes >> 2; if (count > (priv->params->nregs - index)) count = priv->params->nregs - index; + p = kzalloc(num_bytes, GFP_KERNEL); + if (!p) + return -ENOMEM; + mutex_lock(&ocotp_mutex); + buf = p; + ret = clk_prepare_enable(priv->clk); if (ret < 0) { mutex_unlock(&ocotp_mutex); dev_err(priv->dev, "failed to prepare/enable ocotp clk\n"); + kfree(p); return ret; } @@ -184,7 +194,7 @@ static int imx_ocotp_read(void *context, unsigned int offset, } for (i = index; i < (index + count); i++) { - *buf++ = readl(priv->base + IMX_OCOTP_OFFSET_B0W0 + + *(u32 *)buf = readl(priv->base + IMX_OCOTP_OFFSET_B0W0 + i * IMX_OCOTP_OFFSET_PER_WORD); /* 47.3.1.2 @@ -193,13 +203,21 @@ static int imx_ocotp_read(void *context, unsigned int offset, * software before any new write, read or reload access can be * issued */ - if (*(buf - 1) == IMX_OCOTP_READ_LOCKED_VAL) + if (*((u32 *)buf) == IMX_OCOTP_READ_LOCKED_VAL) imx_ocotp_clr_err_if_set(priv); + + buf += 4; } + index = offset % 4; + memcpy(val, &p[index], bytes); + read_end: clk_disable_unprepare(priv->clk); mutex_unlock(&ocotp_mutex); + + kfree(p); + return ret; } @@ -447,7 +465,7 @@ static struct nvmem_config imx_ocotp_nvmem_config = { .name = "imx-ocotp", .read_only = false, .word_size = 4, - .stride = 4, + .stride = 1, .reg_read = imx_ocotp_read, .reg_write = imx_ocotp_write, }; |