[U-Boot] [PATCH v3 1/5] ARM: OMAP4/5: Centralize early clock initialization

[Lokesh Vutla <a0131933@ti.com>]

On Thursday 05 November 2015 03:30 AM, Steve Kipisz wrote:
> Early clock initialization is currently done in two stages for OMAP4/5
> SoCs. The first stage is the initialization of console clocks and
> then we initialize basic clocks for functionality necessary for SoC
> initialization and basic board functionality.
> 
> By splitting up prcm_init and centralizing this clock initialization,
> we setup the code for follow on patches that can do board specific
> initialization such as board detection which will depend on these
> basic clocks.
> 
> As part of this change, since the early clock initialization
> is centralized, we no longer need to expose the console clock
> initialization.
> 
> NOTE: we change the sequence slightly by initializing console clocks
> timer after the io settings are complete, but this is not expected
> to have any functioanlity impact since we setup the basic IO drive
> strength initialization as part of do_io_settings

Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>

Thanks and regards,
Lokesh

> 
> Signed-off-by: Steve Kipisz <s-kipisz2@ti.com>
> Reviewed-by: Tom Rini <trini@konsulko.com<
> ---
> v3 Based on:
>  master      83bf0057 arm: at91: reworked meesc board support
> 
> Changes in v3 (since v2):
>  - Remove SPL-only build of setup_clocks_for_console since it needs
>    to be built in u-boot for NOR boot
>  - Move setup_clocks_for_console from top of setup_early_clocks to inside
>    the switch statement.
> 
> v2:  http://marc.info/?t=144655363000001&r=1&w=2
>       (mailing list squashed original submission)
> 
> Changes in v2:
>  - New patch
> 
>  arch/arm/cpu/armv7/omap-common/clocks-common.c | 21 +++++++++++++++++++--
>  arch/arm/cpu/armv7/omap-common/hwinit-common.c |  3 +--
>  arch/arm/include/asm/arch-omap4/sys_proto.h    |  2 +-
>  arch/arm/include/asm/arch-omap5/sys_proto.h    |  2 +-
>  4 files changed, 22 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm/cpu/armv7/omap-common/clocks-common.c b/arch/arm/cpu/armv7/omap-common/clocks-common.c
> index e28b79568d1d..367d224361be 100644
> --- a/arch/arm/cpu/armv7/omap-common/clocks-common.c
> +++ b/arch/arm/cpu/armv7/omap-common/clocks-common.c
> @@ -769,7 +769,7 @@ void lock_dpll(u32 const base)
>  	wait_for_lock(base);
>  }
>  
> -void setup_clocks_for_console(void)
> +static void setup_clocks_for_console(void)
>  {
>  	/* Do not add any spl_debug prints in this function */
>  	clrsetbits_le32((*prcm)->cm_l4per_clkstctrl, CD_CLKCTRL_CLKTRCTRL_MASK,
> @@ -853,14 +853,31 @@ void do_disable_clocks(u32 const *clk_domains,
>  		disable_clock_domain(clk_domains[i]);
>  }
>  
> -void prcm_init(void)
> +/**
> + * setup_early_clocks() - Setup early clocks needed for SoC
> + *
> + * Setup clocks for console, SPL basic initialization clocks and initialize
> + * the timer. This is invoked prior prcm_init.
> + */
> +void setup_early_clocks(void)
>  {
>  	switch (omap_hw_init_context()) {
>  	case OMAP_INIT_CONTEXT_SPL:
>  	case OMAP_INIT_CONTEXT_UBOOT_FROM_NOR:
>  	case OMAP_INIT_CONTEXT_UBOOT_AFTER_CH:
> +		setup_clocks_for_console();
>  		enable_basic_clocks();
>  		timer_init();
> +		/* Fall through */
> +	}
> +}
> +
> +void prcm_init(void)
> +{
> +	switch (omap_hw_init_context()) {
> +	case OMAP_INIT_CONTEXT_SPL:
> +	case OMAP_INIT_CONTEXT_UBOOT_FROM_NOR:
> +	case OMAP_INIT_CONTEXT_UBOOT_AFTER_CH:
>  		scale_vcores(*omap_vcores);
>  		setup_dplls();
>  		setup_warmreset_time();
> diff --git a/arch/arm/cpu/armv7/omap-common/hwinit-common.c b/arch/arm/cpu/armv7/omap-common/hwinit-common.c
> index 80794f9c611a..91f2dead364b 100644
> --- a/arch/arm/cpu/armv7/omap-common/hwinit-common.c
> +++ b/arch/arm/cpu/armv7/omap-common/hwinit-common.c
> @@ -125,10 +125,9 @@ void s_init(void)
>  	set_mux_conf_regs();
>  #ifdef CONFIG_SPL_BUILD
>  	srcomp_enable();
> -	setup_clocks_for_console();
> -
>  	do_io_settings();
>  #endif
> +	setup_early_clocks();
>  	prcm_init();
>  }
>  
> diff --git a/arch/arm/include/asm/arch-omap4/sys_proto.h b/arch/arm/include/asm/arch-omap4/sys_proto.h
> index f30f86539130..71e3d776aa0d 100644
> --- a/arch/arm/include/asm/arch-omap4/sys_proto.h
> +++ b/arch/arm/include/asm/arch-omap4/sys_proto.h
> @@ -37,7 +37,7 @@ void do_set_mux(u32 base, struct pad_conf_entry const *array, int size);
>  void set_muxconf_regs_essential(void);
>  u32 wait_on_value(u32, u32, void *, u32);
>  void sdelay(unsigned long);
> -void setup_clocks_for_console(void);
> +void setup_early_clocks(void);
>  void prcm_init(void);
>  void bypass_dpll(u32 const base);
>  void freq_update_core(void);
> diff --git a/arch/arm/include/asm/arch-omap5/sys_proto.h b/arch/arm/include/asm/arch-omap5/sys_proto.h
> index 7fcb78389403..b9e09e7c52a8 100644
> --- a/arch/arm/include/asm/arch-omap5/sys_proto.h
> +++ b/arch/arm/include/asm/arch-omap5/sys_proto.h
> @@ -48,7 +48,7 @@ void do_set_mux32(u32 base, struct pad_conf_entry const *array, int size);
>  void set_muxconf_regs_essential(void);
>  u32 wait_on_value(u32, u32, void *, u32);
>  void sdelay(unsigned long);
> -void setup_clocks_for_console(void);
> +void setup_early_clocks(void);
>  void prcm_init(void);
>  void bypass_dpll(u32 const base);
>  void freq_update_core(void);
>