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Let us move SiFive platform overrides for FU540 and FU740 into a separate
directory so better maintainability. Other SoC vendors can also create
their own directory under platform/generic.
Signed-off-by: Anup Patel <[email protected]>
Reviewed-by: Atish Patra <[email protected]>
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When the watchdog is running the HiFive Unmatched board does not reboot
properly and shuts down itself a few seconds after reboot, in the early
stages of the u-boot loading. On a Linux kernel this happens when the
da9063_wdt module is loaded. This does not happen if the module is
unloaded before reboot or if the watchdog module is loaded with
"stop_on_reboot=1".
Fix that by stopping the watchdog before attempting to reset the board.
This is done by zeroing the TWDSCALE field of CONTROL_D register, unless
it was already set to 0.
Reported-by: Tianon Gravi <[email protected]>
Signed-off-by: Aurelien Jarno <[email protected]>
Reviewed-by: Nikita Shubin <[email protected]>
Tested-by: Nikita Shubin <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
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da9063_reset() and da9063_shutdown() take the chip address in argument
(like similar functions), but in practice use the da9063 global struct
instead. Fix that.
Signed-off-by: Aurelien Jarno <[email protected]>
Reviewed-by: Nikita Shubin <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Reviewed-by: Xiang W <[email protected]>
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BUG and BUG_ON are not informative and are rather lazy interfaces, only
telling the user that something went wrong in a given function, but not
what, requiring the user to find the sources corresponding to their
firmware (which may not be available) and figure out how that BUG(_ON)
was hit. Even SBI_ASSERT in its current form, which does include the
condition that triggered it in the output, isn't necessarily very
informative. In some cases, the error may be fixable by the user, but
they need to know the problem in order to have any hope of fixing it.
It's also a nuisance for developers, whose development trees may have
changed significantly since the release in question being used, and so
line numbers can make it harder for them to understand which error case
a user has hit.
This patch introduces a new sbi_panic function which is printf-like,
allowing detailed error messages to be printed to the console. BUG and
BUG_ON are removed, since the former is just a worse form of sbi_panic
and the latter is a worse version of SBI_ASSERT. Finally, SBI_ASSERT is
augmented to take a set of arguments to pass to sbi_panic on failure,
used like so (sbi_boot_print_hart's current error case, which currently
manually calls sbi_printf and sbi_hart_hang):
SBI_ASSERT(xlen >= 1, ("Error %d getting MISA XLEN\n", xlen));
The existing users of BUG are replaced with calls to sbi_panic along
with informative error messages. BUG_ON and SBI_ASSERT were unused (and,
in the case of SBI_ASSERT, remain unused).
Many existing users of sbi_hart_hang should be converted to use either
sbi_panic or SBI_ASSERT after this commit.
Signed-off-by: Jessica Clarke <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Reviewed-by: Xiang W <[email protected]>
Reviewed-by: Atish Patra <[email protected]>
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da9063 PMIC can be used to reset/shutdown the
Sifive Unmatched board.
shutdown is done simply by writing SHUTDOWN bit to
DA9063_REG_CONTROL_F register.
reset via setting WAKEUP bit in DA9063_REG_CONTROL_F
register followed by masking POWER and POWER1 domains
and setting STANDBY bit in DA9063_REG_CONTROL_A,
originally discovered by Alexandre Ghiti on linux-riscv
maillists.
Tested-by: Heinrich Schuchardt <[email protected]>
Reviewed-by: Alexandre Ghiti <[email protected]>
Tested-by: Alexandre Ghiti <[email protected]>
Signed-off-by: Nikita Shubin <[email protected]>
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Instruction TLB can fail to respect a non-global SFENCE thus we need to
flush the TLB using SFENCE.VMA x0, x0
See full description of CIP-1200 in Errata_FU740-C000_20210205 from
https://www.sifive.com/boards/hifive-unmatched
Signed-off-by: David Abdurachmanov <[email protected]>
Signed-off-by: Heinrich Schuchardt <[email protected]>
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