[U-Boot] [PATCH 1/3 v8] arm926ejs: add NXP LPC32x0 cpu series support

[Albert ARIBAUD <albert.u.boot@aribaud.net>]

Hi Vladimir,

Le 13/01/2012 01:42, Vladimir Zapolskiy a ?crit :

> diff --git a/arch/arm/cpu/arm926ejs/lpc32xx/cpu.c b/arch/arm/cpu/arm926ejs/lpc32xx/cpu.c
> new file mode 100644
> index 0000000..e29e130
> --- /dev/null
> +++ b/arch/arm/cpu/arm926ejs/lpc32xx/cpu.c
> @@ -0,0 +1,70 @@
> +/*
> + * Copyright (C) 2011 by Vladimir Zapolskiy<vz@mleia.com>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * as published by the Free Software Foundation; either version 2
> + * of the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
> + * MA 02110-1301, USA.
> + */
> +
> +#include<common.h>
> +#include<asm/arch/cpu.h>
> +#include<asm/arch/clk.h>
> +#include<asm/arch/wdt.h>
> +#include<asm/io.h>
> +
> +static struct clk_pm_regs *clk = (struct clk_pm_regs *)CLK_PM_BASE;
> +static struct wdt_regs  *wdt = (struct wdt_regs *)WDT_BASE;
> +
> +void reset_cpu(ulong addr)
> +{
> +	/* Enable watchdog clock */
> +	setbits_le32(&clk->timclk_ctrl, CLK_TIMCLK_WATCHDOG);
> +
> +	/* Reset pulse length is 13005 peripheral clock frames */
> +	writel(13000,&wdt->pulse);

I can't help but ask, if the comment says 13005, then why does the code 
say 13000?

> +	/* Force WDOG_RESET2 and RESOUT_N signal active */
> +	writel(WDTIM_MCTRL_RESFRC2 | WDTIM_MCTRL_RESFRC1 | WDTIM_MCTRL_M_RES2,
> +	&wdt->mctrl);
> +
> +	while (1)
> +		/* NOP */;
> +}
> +
> +#if defined(CONFIG_ARCH_CPU_INIT)
> +int arch_cpu_init(void)
> +{
> +	/*
> +	 * It might be necessary to flush data cache, if U-boot is loaded
> +	 * from kickstart bootloader, e.g. from S1L loader
> +	 */
> +	flush_dcache_all();
> +
> +	return 0;
> +}
> +#else
> +#error "You have to select CONFIG_ARCH_CPU_INIT"
> +#endif

No other code ever has this kind of #error on CONFIG_ARCH_CPU_INIT not 
being defined. What's the point of it? People won't suddenly decide to 
undefine CONFIG_ARCH_CPU_INIT for fun, I think.

> diff --git a/arch/arm/include/asm/arch-lpc32xx/sys_proto.h b/arch/arm/include/asm/arch-lpc32xx/sys_proto.h
> new file mode 100644
> index 0000000..b2cbfcd
> --- /dev/null
> +++ b/arch/arm/include/asm/arch-lpc32xx/sys_proto.h
> @@ -0,0 +1,25 @@
> +/*
> + * Copyright (C) 2011 Vladimir Zapolskiy<vz@mleia.com>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * as published by the Free Software Foundation; either version 2
> + * of the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
> + * MA  02110-1301, USA.
> + */
> +
> +#ifndef _LPC32XX_SYS_PROTO_H
> +#define _LPC32XX_SYS_PROTO_H
> +
> +void lpc32xx_uart_init(unsigned int uart_id);
> +
> +#endif /* _LPC32XX_SYS_PROTO_H */

Do we need this .h for a single function when we already have uart.h?

Amicalement,
-- 
Albert.