On Thu, Jul 27, 2023 at 12:09:07PM +0530, Mukesh Ojha wrote:
> On 7/24/2023 2:08 PM, Komal Bajaj wrote:
[..]
> > diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
> > index f82431ec8aef..e248d3daadf3 100644
> > --- a/drivers/nvmem/Makefile
> > +++ b/drivers/nvmem/Makefile
> > @@ -44,6 +44,8 @@ obj-$(CONFIG_NVMEM_NINTENDO_OTP) += nvmem-nintendo-otp.o
> > nvmem-nintendo-otp-y := nintendo-otp.o
> > obj-$(CONFIG_NVMEM_QCOM_QFPROM) += nvmem_qfprom.o
> > nvmem_qfprom-y := qfprom.o
> > +obj-$(CONFIG_NVMEM_QCOM_SEC_QFPROM) += nvmem_sec_qfprom.o
> > +nvmem_sec_qfprom-y := sec-qfprom.o
>
> Are we just doing this for just renaming the object ?
>
Correct.
> > obj-$(CONFIG_NVMEM_RAVE_SP_EEPROM) += nvmem-rave-sp-eeprom.o
> > nvmem-rave-sp-eeprom-y := rave-sp-eeprom.o
> > obj-$(CONFIG_NVMEM_RMEM) += nvmem-rmem.o
> > diff --git a/drivers/nvmem/sec-qfprom.c b/drivers/nvmem/sec-qfprom.c
[..]
> > +static int sec_qfprom_reg_read(void *context, unsigned int reg, void *_val, size_t bytes)
> > +{
> > + struct sec_qfprom *priv = context;
> > + unsigned int i;
> > + u8 *val = _val;
> > + u32 read_val;
> > + u8 *tmp;
> > +
> > + for (i = 0; i < bytes; i++, reg++) {
> > + if (i == 0 || reg % 4 == 0) {
> > + if (qcom_scm_io_readl(priv->base + (reg & ~3), &read_val)) {
> > + dev_err(priv->dev, "Couldn't access fuse register\n");
> > + return -EINVAL;
> > + }
> > + tmp = (u8 *)&read_val;
> > + }
> > +
> > + val[i] = tmp[reg & 3];
> > + }
>
> Getting secure read from fuse region is fine here, since we have to read
> 4 byte from trustzone, but this restriction of reading is also there
> for sm8{4|5}50 soc's where byte by byte reading is protected and granularity
> set to 4 byte (qfprom_reg_read() in drivers/nvmem/qfprom.c)
> is will result in abort, in that case this function need to export this
> logic.
>
If qfprom needs similar treatment, then let's land this first and then
consider generalizing (i.e. move to some library code) this - or if
infeasible, just fix qfprom_reg_read().
Regards,
Bjorn
