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ARM: OMAP2+: omap_hwmod: Add support for earlycon 

Hwmod core tries to reset and idles each IP that is registered with hwmod.
In case of earlycon, that specific uart IP cannot be reset or keep it in
idle state else earlycon hangs once hwmod resets that uart IP. So add support
to not reset uart that is being used as earlycon only if CONFIG_SERIAL_EARLYCON
is enabled.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Lokesh Vutla 2017-01-20 10:39:10 -08:00 committed by Tony Lindgren
parent 7afa44e0e8
commit 8dd6666f49
1 changed files with 33 additions and 0 deletions
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33
arch/arm/mach-omap2/omap_hwmod.c
View File

@ -3248,6 +3248,36 @@ int __init omap_hwmod_setup_one(const char *oh_name)
return 0;
}
/**
* omap_hwmod_setup_earlycon_flags - set up flags for early console
*
* Enable DEBUG_OMAPUART_FLAGS for uart hwmod that is being used as
* early concole so that hwmod core doesn't reset and keep it in idle
* that specific uart.
*/
#ifdef CONFIG_SERIAL_EARLYCON
static void __init omap_hwmod_setup_earlycon_flags(void)
{
struct device_node *np;
struct omap_hwmod *oh;
const char *uart;
np = of_find_node_by_path("/chosen");
if (np) {
uart = of_get_property(np, "stdout-path", NULL);
if (uart) {
np = of_find_node_by_path(uart);
if (np) {
uart = of_get_property(np, "ti,hwmods", NULL);
oh = omap_hwmod_lookup(uart);
if (oh)
oh->flags |= DEBUG_OMAPUART_FLAGS;
}
}
}
}
#endif
/**
* omap_hwmod_setup_all - set up all registered IP blocks
*
@ -3261,6 +3291,9 @@ static int __init omap_hwmod_setup_all(void)
_ensure_mpu_hwmod_is_setup(NULL);
omap_hwmod_for_each(_init, NULL);
#ifdef CONFIG_SERIAL_EARLYCON
omap_hwmod_setup_earlycon_flags();
#endif
omap_hwmod_for_each(_setup, NULL);
return 0;