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| author | Hung-Te Lin <hungte@chromium.org> | 2013-09-24 15:51:05 +0800 |
|---|---|---|
| committer | Isaac Christensen <isaac.christensen@se-eng.com> | 2014-08-18 19:03:39 +0200 |
| commit | 12b121f3fef61d6a346c2575266a9cb46bb9d31f (patch) | |
| tree | 24d4024371da777582f76b5cec6448272859dc03 /src/cpu/samsung/exynos5420/power.h | |
| parent | 68aef1169239cc5d33fb36f05cd32d7e062b7743 (diff) | |
| download | coreboot-12b121f3fef61d6a346c2575266a9cb46bb9d31f.tar.xz | |
arm/exynos: Allow releasing UART retention for resume.
The UART / serial console is put in retention state by kernel during suspend /
resume path, which caused Coreboot not able to print any messages during resume.
Sending values to the padret_uart_opt inside PMU may release UART, but that may
also cause unexpected output when kernel is back. However, it's still very
helpful when we are debugging suspend/resume inside Coreboot.
To get UART message on resume, call wakeup_enable_uart() in boot block or
romstage (before console_init).
Change-Id: Ib5759cb402c6e018d9dba14fad8b61f6a1b1a265
Reviewed-on: https://chromium-review.googlesource.com/170440
Tested-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Commit-Queue: Hung-Te Lin <hungte@chromium.org>
(cherry picked from commit 547fbbfe2eeb6da4e161f36be2caf8099f9eac9b)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6649
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src/cpu/samsung/exynos5420/power.h')
| -rw-r--r-- | src/cpu/samsung/exynos5420/power.h | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/src/cpu/samsung/exynos5420/power.h b/src/cpu/samsung/exynos5420/power.h index a89ee9dca8..fd1eac5768 100644 --- a/src/cpu/samsung/exynos5420/power.h +++ b/src/cpu/samsung/exynos5420/power.h @@ -70,9 +70,11 @@ struct exynos5_power { } arm_core[4]; uint8_t reserved9[0xe04]; uint32_t padret_dram_status; /* 0x3004 */ - uint8_t reservedA[0x1e0]; + uint8_t reservedA[0xe0]; + uint32_t padret_uart_opt; /* 0x30e8 */ + uint8_t reservedB[0xfc]; uint32_t padret_dram_cblk_opt; /* 0x31e8 */ - uint8_t reservedB[0x120]; + uint8_t reservedC[0x120]; uint32_t ps_hold_ctrl; /* 0x330c */ } __attribute__ ((__packed__)); @@ -103,4 +105,8 @@ void power_exit_wakeup(void); /* pmu debug is used for xclkout, enable xclkout with source as XXTI */ void power_enable_xclkout(void); +/* Release UART retention on resume (only for debugging, may conflict with + * kernel). */ +void power_release_uart_retention(void); + #endif |