Re: [PATCH 02/12] serial context save/restore

[Kevin Hilman <khilman@deeprootsystems.com>]

"Rajendra Nayak" <rnayak@ti.com> writes:

> This patch adds the context save restore functions for UART
>
> Signed-off-by: Rajendra Nayak <rnayak@ti.com>
> ---
>  arch/arm/mach-omap2/serial.c             |   55 +++++++++++++++++++++++++++++++
>  arch/arm/plat-omap/include/mach/serial.h |   13 ++++++-
>  include/linux/serial_reg.h               |    1
>  3 files changed, 68 insertions(+), 1 deletion(-)
>
> Index: linux-omap-2.6/arch/arm/mach-omap2/serial.c
> ===================================================================
> --- linux-omap-2.6.orig/arch/arm/mach-omap2/serial.c	2008-09-01
> 18:11:33.000000000 +0530
> +++ linux-omap-2.6/arch/arm/mach-omap2/serial.c	2008-09-01 18:11:50.000000000
> +0530
> @@ -290,6 +290,61 @@ void __init omap_serial_init(void)
>  	omap_serial_kick();
>  }
>
> +#ifdef CONFIG_ARCH_OMAP3
> +static struct omap3_uart_regs uart_ctx[OMAP_MAX_NR_PORTS];
> +void omap3_save_uart_ctx(int unum)
> +{
> +	u16 lcr = 0;
> +
> +	struct plat_serial8250_port *p = serial_platform_data + unum;
> +
> +	if (uart_ick[unum] == NULL)
> +		return;
> +
> +	lcr = serial_read_reg(p, UART_LCR);
> +	serial_write_reg(p, UART_LCR, 0xBF);
> +	uart_ctx[unum].dll = serial_read_reg(p, UART_DLL);
> +	uart_ctx[unum].dlh = serial_read_reg(p, UART_DLM);
> +	serial_write_reg(p, UART_LCR, lcr);
> +	uart_ctx[unum].ier = serial_read_reg(p, UART_IER);
> +	uart_ctx[unum].sysc = serial_read_reg(p, UART_OMAP_SYSC);
> +	uart_ctx[unum].scr = serial_read_reg(p, UART_OMAP_SCR);
> +	uart_ctx[unum].wer = serial_read_reg(p, UART_OMAP_WER);
> +}
> +EXPORT_SYMBOL(omap3_save_uart_ctx);
> +
> +void omap3_restore_uart_ctx(int unum)
> +{
> +	u16 efr = 0;
> +
> +	struct plat_serial8250_port *p = serial_platform_data + unum;
> +
> +	if (uart_ick[unum] == NULL)
> +		return;
> +
> +	serial_write_reg(p, UART_OMAP_MDR1, 0x7);
> +	serial_write_reg(p, UART_LCR, 0xBF); /* Config B mode */
> +	efr = serial_read_reg(p, UART_EFR);
> +	serial_write_reg(p, UART_EFR, UART_EFR_ECB);
> +	serial_write_reg(p, UART_LCR, 0x0); /* Operational mode */
> +	serial_write_reg(p, UART_IER, 0x0);
> +	serial_write_reg(p, UART_LCR, 0xBF); /* Config B mode */
> +	serial_write_reg(p, UART_DLL, uart_ctx[unum].dll);
> +	serial_write_reg(p, UART_DLM, uart_ctx[unum].dlh);
> +	serial_write_reg(p, UART_LCR, 0x0); /* Operational mode */
> +	serial_write_reg(p, UART_IER, uart_ctx[unum].ier);
> +	serial_write_reg(p, UART_FCR, 0xA1);
> +	serial_write_reg(p, UART_LCR, 0xBF); /* Config B mode */
> +	serial_write_reg(p, UART_EFR, efr);
> +	serial_write_reg(p, UART_LCR, UART_LCR_WLEN8);
> +	serial_write_reg(p, UART_OMAP_SCR, uart_ctx[unum].scr);
> +	serial_write_reg(p, UART_OMAP_WER, uart_ctx[unum].wer);
> +	serial_write_reg(p, UART_OMAP_SYSC, uart_ctx[unum].sysc);
> +	serial_write_reg(p, UART_OMAP_MDR1, 0x00); /* UART 16x mode */
> +}
> +EXPORT_SYMBOL(omap3_restore_uart_ctx);
> +#endif /* CONFIG_ARCH_OMAP3 */
> +
>  static struct platform_device serial_device = {
>  	.name			= "serial8250",
>  	.id			= PLAT8250_DEV_PLATFORM,
> Index: linux-omap-2.6/include/linux/serial_reg.h
> ===================================================================
> --- linux-omap-2.6.orig/include/linux/serial_reg.h	2008-09-01
> 18:11:29.000000000 +0530
> +++ linux-omap-2.6/include/linux/serial_reg.h	2008-09-01 18:11:50.000000000 +0530
> @@ -323,6 +323,7 @@
>  #define UART_OMAP_MVER		0x14	/* Module version register */
>  #define UART_OMAP_SYSC		0x15	/* System configuration register */
>  #define UART_OMAP_SYSS		0x16	/* System status register */
> +#define UART_OMAP_WER           0x17    /* Wake-up enable register */

This was added with spaces instead of tabs.


>  #endif /* _LINUX_SERIAL_REG_H */
>
> Index: linux-omap-2.6/arch/arm/plat-omap/include/mach/serial.h
> ===================================================================
> --- linux-omap-2.6.orig/arch/arm/plat-omap/include/mach/serial.h	2008-09-01
> 18:11:29.000000000 +0530
> +++ linux-omap-2.6/arch/arm/plat-omap/include/mach/serial.h	2008-09-01
> 18:11:50.000000000 +0530
> @@ -39,5 +39,16 @@
>  				__ret = 1;			\
>  			__ret;					\
>  			})
> -
> +#ifndef __ASSEMBLY__
> +struct omap3_uart_regs {
> +	u16 dll;
> +	u16 dlh;
> +	u16 ier;
> +	u16 sysc;
> +	u16 scr;
> +	u16 wer;
> +};
> +extern void omap3_save_uart_ctx(int unum);
> +extern void omap3_restore_uart_ctx(int unum);
> +#endif /* __ASSEMBLY__ */
>  #endif
>
>
> --
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