Messages in this thread Patch in this message | | | From | Bryan O'Donoghue <> | Subject | [PATCH v4 5/7] nvmem: imx-ocotp: Add i.MX7D timing write clock setup support | Date | Mon, 23 Oct 2017 15:34:48 +0100 |
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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@nexus-software.ie> --- drivers/nvmem/imx-ocotp.c | 43 ++++++++++++++++++++++++++++++++++++------- 1 file changed, 36 insertions(+), 7 deletions(-)
diff --git a/drivers/nvmem/imx-ocotp.c b/drivers/nvmem/imx-ocotp.c index 93d3cb5..be8d002 100644 --- a/drivers/nvmem/imx-ocotp.c +++ b/drivers/nvmem/imx-ocotp.c @@ -50,17 +50,14 @@ #define IMX_OCOTP_BM_CTRL_ERROR 0x00000200 #define IMX_OCOTP_BM_CTRL_REL_SHADOWS 0x00000400 -#define DEF_RELAX 20 /* > 16.5ns */ +#define DEF_RELAX 20 /* > 16.5ns */ +#define DEF_FSOURCE 1001 /* > 1000 ns */ +#define DEF_STROBE_PROG 10000 /* IPG clocks */ #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 +66,12 @@ 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 +196,27 @@ 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; + u64 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_ULL((u64)clk_rate * DEF_FSOURCE, + NSEC_PER_SEC) + 1; + strobe_prog = DIV_ROUND_CLOSEST_ULL((u64)clk_rate * DEF_STROBE_PROG, + NSEC_PER_SEC) + 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 +243,7 @@ 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. @@ -377,26 +401,31 @@ static struct nvmem_config imx_ocotp_nvmem_config = { static const struct ocotp_params imx6q_params = { .nregs = 128, .bank_address_words = 0, + .set_timing = imx_ocotp_set_imx6_timing, }; static const struct ocotp_params imx6sl_params = { .nregs = 64, .bank_address_words = 0, + .set_timing = imx_ocotp_set_imx6_timing, }; static const struct ocotp_params imx6sx_params = { .nregs = 128, .bank_address_words = 0, + .set_timing = imx_ocotp_set_imx6_timing, }; static const struct ocotp_params imx6ul_params = { .nregs = 128, .bank_address_words = 0, + .set_timing = imx_ocotp_set_imx6_timing, }; static const struct ocotp_params imx7d_params = { .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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