Re: [M68KNOMMU]: new style ColdFire UART driver

[Greg Ungerer <gerg@snapgear.com>]

Hi Andrew,

Andrew Morton wrote:
> On Fri, 19 Oct 2007 11:42:41 +1000
> Greg Ungerer <gerg@snapgear.com> wrote:
>
> > A new style serial driver for the Freescale ColdFire UART to replace
> > the old style one currently in the tree (drivers/serial/mcfserial.c).
> >
> > Currently this UART is only found in the ColdFire CPU family of parts
> > (thus I prefixed this patch [M68KNOMMU]).
> >
> > This has been around for a long while now, tested on all available
> > platforms.
> >
> > ...
>
> All of these:
>
> > +/****************************************************************************/
>
> don't really add much value.
>
> > +static unsigned int mcf_get_mctrl(struct uart_port *port)
> > +{
> > +	struct mcf_uart *pp = (struct mcf_uart *) port;
>
> container_of() would be nicer: it explains what's going on and removes the
> unpleasing requirement that uart_port be the first member of mcf_uart.
>
> > +static void mcf_set_mctrl(struct uart_port *port, unsigned int sigs)
> > +{
> > +	struct mcf_uart *pp = (struct mcf_uart *) port;
>
> Many instances..

Ok, I'll change those over to container_of().


> > +static void mcf_set_termios(struct uart_port *port, struct ktermios *termios,
> > +	struct ktermios *old)
> > +{
> > +	unsigned long flags;
> > +	unsigned int baud, baudclk;
> > +	unsigned char mr1, mr2;
>
> Is this all up-to-date with Alan's recent termios changes?

As far as I can tell, yes.


> > +static struct mcf_uart mcf_ports[3];
> > +
> > +#define	MCF_MAXPORTS	(sizeof(mcf_ports) / sizeof(struct mcf_uart))
>
> Use ARRAY_SIZE here.

Yep, I'll change that.


> > +/****************************************************************************/
> > +#if defined(CONFIG_SERIAL_MCF_CONSOLE)
> > +/****************************************************************************/
> > +
> > +int __init early_mcf_setup(struct mcf_platform_uart *platp)
>
> hrm, this is global and has no callers.
>
> > +{
> > +	struct uart_port *port;
> > +	int i;
> > +
> > +	for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) {
> > +		port = &mcf_ports[i].port;
> > +
> > +		port->line = i;
> > +		port->type = PORT_MCF;
> > +		port->mapbase = platp[i].mapbase;
> > +		port->membase = (platp[i].membase) ? platp[i].membase :
> > +			(unsigned char __iomem *) port->mapbase;
> > +		port->iotype = SERIAL_IO_MEM;
> > +		port->irq = platp[i].irq;
> > +		port->uartclk = MCF_BUSCLK;
> > +		port->flags = ASYNC_BOOT_AUTOCONF;
> > +		port->ops = &mcf_uart_ops;
> > +	}
> > +
> > +	return 0;
> > +}
> > +

It is intended to be used by ColdFire platforms that want early
boot console support. The old driver (drivers/serial/mcfserial.c)
sort of gave you this for free with its fixed resourcing.
I have changes to the ColdFire based m68knommu systems to
use a platform model at init, and this is used there.

Thanks.

Regards
Greg


------------------------------------------------------------------------
Greg Ungerer  --  Chief Software Dude       EMAIL:     gerg@snapgear.com
Secure Computing Corporation                PHONE:       +61 7 3435 2888
825 Stanley St,                             FAX:         +61 7 3891 3630
Woolloongabba, QLD, 4102, Australia         WEB: http://www.SnapGear.com
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