Am Do., 21. Feb. 2019, 22:56 hat Marek Vasut <ma...@denx.de> geschrieben:
> On 2/21/19 10:43 PM, Simon Goldschmidt wrote: > > This adds code to take peripherals out of reset based on an environment > > variable. This is in preparation for removing the code that does this > from > > SPL. > > > > However, some drivers even in current Linux cannot handle peripheral > reset, > > so until this works, we need a compatibility workaround. > > > > This workaround is implemented in the 'remove' callback of this reset > > driver, which is called on OS_PREPARE: it checks if the environment > > variable "socfpga_permodrst_ungate" - if it is set to 1, it deasserts all > > peripheral resets, which is what the gen5 SPL did up to now. > > > > This is in preparation to clean up the SPL and implementing proper reset > > handling for U-Boot. > > > > Signed-off-by: Simon Goldschmidt <simon.k.r.goldschm...@gmail.com> > > --- > > > > Changes in v2: > > - moved from Kernel option "OLD_SOCFPGA_KERNEL_COMPAT" to environment > > variable "socfpga_permodrst_ungate" > > > > drivers/reset/reset-socfpga.c | 34 ++++++++++++++++++++++++++++++++++ > > 1 file changed, 34 insertions(+) > > > > diff --git a/drivers/reset/reset-socfpga.c > b/drivers/reset/reset-socfpga.c > > index b2acfcd2ec..749f671e05 100644 > > --- a/drivers/reset/reset-socfpga.c > > +++ b/drivers/reset/reset-socfpga.c > > @@ -89,6 +89,36 @@ static int socfpga_reset_probe(struct udevice *dev) > > return 0; > > } > > > > +#ifndef CONFIG_SPL_BUILD > > +/* > > + * This remove function is called before starting OS to deassert > peripheral > > + * resets for Kernels that don't support this. > > + * > > + * The reset driver checks the environment variable > "socfpga_permodrst_ungate" > > + * when it is removed. If this variable is '1', all peripherals in > 'permodrst' > > + * are taken out of reset before booting into the OS. > > + * This should be required for gen5 systems only that are running Linux > kernels > > + * without proper peripheral reset support for all drivers used. > > + */ > > +static int socfpga_reset_remove(struct udevice *dev) > > +{ > > + struct socfpga_reset_data *data = dev_get_priv(dev); > > + const char *env_str; > > + long val; > > + > > + env_str = env_get("socfpga_permodrst_ungate"); > > + if (env_str) { > > + val = simple_strtol(env_str, NULL, 0); > > + if (val == 1) { > > + puts("Deasserting all peripheral resets\n"); > > + writel(0, data->membase + 4); > > + } > > + } > > + > > + return 0; > > +} > > +#endif > > + > > static const struct udevice_id socfpga_reset_match[] = { > > { .compatible = "altr,rst-mgr" }, > > { /* sentinel */ }, > > @@ -101,4 +131,8 @@ U_BOOT_DRIVER(socfpga_reset) = { > > .probe = socfpga_reset_probe, > > .priv_auto_alloc_size = sizeof(struct socfpga_reset_data), > > .ops = &socfpga_reset_ops, > > +#ifndef CONFIG_SPL_BUILD > > + .remove = socfpga_reset_remove, > > + .flags = DM_FLAG_OS_PREPARE, > > +#endif > > }; > > Does this work if you use Falcon mode ? :) > Probably not, but would anyone be able to use falcon mode in socfpga gen5 given the current SPL size? I think it didn't fit for,a last time I checked. And if it fits in the future, we probably don't need this workaraound any more... I did it like that since env_get() broke compilation of SPL. But if you insist of making this work even for SPL, I'll check again. Regards, Simon > _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot