Subject: [PATCH 01/17] ARM: pxa/raumfeld: add basic structure for devices

From: [email-masked] (Marek Vasut)
Date: Wed, 25 Nov 2009 17:51:40 +0100

Dne St 25. listopadu 2009 16:26:32 Mike Rapoport napsal(a):
> Daniel,
> Below are my comments to the patches. Some of the comments apply to several
> patches, but I'm too lazy to copy them into relevant threads :)
> 
> Daniel Mack wrote:
> > No function yet, just the file skeletons.
> >
> > Signed-off-by: Daniel Mack <[email-masked]>
> > ---
> >  arch/arm/mach-pxa/Kconfig    |   18 ++++++
> >  arch/arm/mach-pxa/Makefile   |    3 +
> >  arch/arm/mach-pxa/raumfeld.c |  122
> > ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 143
> > insertions(+), 0 deletions(-)
> >  create mode 100644 arch/arm/mach-pxa/raumfeld.c
> >
> > diff --git a/arch/arm/mach-pxa/Kconfig b/arch/arm/mach-pxa/Kconfig
> > index 20e645a..f4dd069 100644
> > --- a/arch/arm/mach-pxa/Kconfig
> > +++ b/arch/arm/mach-pxa/Kconfig
> > @@ -399,6 +399,24 @@ config MACH_TREO680
> >  	  Say Y here if you intend to run this kernel on Palm Treo 680
> >  	  smartphone.
> >
> > +config MACH_RAUMFELD_RC
> > +	bool "Raumfeld Controller"
> > +	select PXA3xx
> > +	select CPU_PXA300
> > +	select HAVE_PWM
> > +
> > +config MACH_RAUMFELD_CONNECTOR
> > +	bool "Raumfeld Connector"
> > +	select PXA3xx
> > +	select CPU_PXA300
> > +	select PXA_SSP
> > +
> > +config MACH_RAUMFELD_SPEAKER
> > +	bool "Raumfeld Speaker"
> > +	select PXA3xx
> > +	select CPU_PXA300
> > +	select PXA_SSP
> > +
> >  config PXA_SHARPSL
> >  	bool "SHARP Zaurus SL-5600, SL-C7xx and SL-Cxx00 Models"
> >  	select SHARP_SCOOP
> > diff --git a/arch/arm/mach-pxa/Makefile b/arch/arm/mach-pxa/Makefile
> > index b5d29e6..1ed7509 100644
> > --- a/arch/arm/mach-pxa/Makefile
> > +++ b/arch/arm/mach-pxa/Makefile
> > @@ -88,6 +88,9 @@ obj-$(CONFIG_MACH_E740)		+= e740.o
> >  obj-$(CONFIG_MACH_E750)		+= e750.o
> >  obj-$(CONFIG_MACH_E400)		+= e400.o
> >  obj-$(CONFIG_MACH_E800)		+= e800.o
> > +obj-$(CONFIG_MACH_RAUMFELD_RC)		+= raumfeld.o
> > +obj-$(CONFIG_MACH_RAUMFELD_CONNECTOR)	+= raumfeld.o
> > +obj-$(CONFIG_MACH_RAUMFELD_SPEAKER)	+= raumfeld.o
> >
> >  # Support for blinky lights
> >  led-y := leds.o
> > diff --git a/arch/arm/mach-pxa/raumfeld.c b/arch/arm/mach-pxa/raumfeld.c
> > new file mode 100644
> > index 0000000..89ead5f
> > --- /dev/null
> > +++ b/arch/arm/mach-pxa/raumfeld.c
> > @@ -0,0 +1,122 @@
> > +/*
> > + * arch/arm/mach-pxa/raumfeld.c
> > + *
> > + * Support for the following Raumfeld devices:
> > + *
> > + * 	* Controller
> > + *  	* Connector
> > + *  	* Speaker S/M
> > + *
> > + * See http://www.raumfeld.com for details.
> > + *
> > + * Copyright (c) 2009 Daniel Mack <[email-masked]>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + */
> > +
> > +#include <linux/init.h>
> > +#include <linux/kernel.h>
> > +#include <linux/sysdev.h>
> > +#include <linux/interrupt.h>
> > +
> > +#include <asm/mach-types.h>
> > +#include <asm/mach/arch.h>
> > +
> > +#include <mach/hardware.h>
> > +#include <mach/pxa3xx-regs.h>
> > +#include <mach/mfp-pxa3xx.h>
> > +#include <mach/mfp-pxa300.h>
> > +
> > +#include "generic.h"
> > +#include "devices.h"
> > +#include "clock.h"
> > +
> > +/*
> > + * GPIO configuration (common for all hardware platforms)
> > + */
> > +static mfp_cfg_t raumfeld_pin_config[] __initdata = {
> > +	/* UART1 */
> > +	GPIO77_UART1_RXD,
> > +	GPIO78_UART1_TXD,
> > +	GPIO79_UART1_CTS,
> > +	GPIO81_UART1_DSR,
> > +	GPIO83_UART1_DTR,
> > +	GPIO84_UART1_RTS,
> > +
> > +	/* UART3 */
> > +	GPIO110_UART3_RXD,
> > +};
> > +
> > +static void __init raumfeld_common_init(void)
> > +{
> > +	enable_irq_wake(IRQ_WAKEUP0);
> > +	pxa_set_ffuart_info(NULL);
> > +
> > +	gpio_request(mfp_to_gpio(GPIO_W2W_RESET), "Wi2Wi reset");
> 
> gpio_request may fail, thought it's unlikely to happen. Anyway, adding
>  check for it's return value seems to be a good practice.

Well if the gpio_request fails here, you are doomed anyway. There's nowhere to 
return to. But it's a good idea to fail and don't try to request other GPIOs.
> 
> > +	gpio_direction_output(mfp_to_gpio(GPIO_W2W_RESET), 0);
> > +
> > +	gpio_request(mfp_to_gpio(GPIO_W2W_PDN), "Wi2Wi powerup");
> > +	gpio_direction_output(mfp_to_gpio(GPIO_W2W_PDN), 0);
> > +
> > +	/* this can be used to switch off the device */
> > +	gpio_request(mfp_to_gpio(GPIO_SHUTDOWN_SUPPLY), "supply shutdown");
> > +	gpio_direction_output(mfp_to_gpio(GPIO_SHUTDOWN_SUPPLY), 0);
> > +
> > +	pxa3xx_mfp_config(ARRAY_AND_SIZE(raumfeld_pin_config));
> > +}
> > +
> > +static void __init raumfeld_controller_init(void)
> > +{
> > +	raumfeld_common_init();
> > +}
> > +
> > +static void __init raumfeld_connector_init(void)
> > +{
> > +	raumfeld_common_init();
> > +}
> > +
> > +static void __init raumfeld_speaker_init(void)
> > +{
> > +	raumfeld_common_init();
> > +}
> 
> I failed to follow what peripherals are common to what boards, but after
> applying all the patches it seems that all three _init functions are really
> similar. Have you considered having one _init function for all three
>  machines and calling machine-specific init based on machine_is_X?
> 
> > +/* physical memory regions */
> > +#define	RAUMFELD_SDRAM_BASE	0xa0000000	/* SDRAM region */
> > +
> > +#ifdef CONFIG_MACH_RAUMFELD_RC
> > +MACHINE_START(RAUMFELD_RC, "Raumfeld Controller")
> > +	.phys_io	= 0x40000000,
> > +	.io_pg_offst	= (io_p2v(0x40000000) >> 18) & 0xfffc,
> > +	.boot_params	= RAUMFELD_SDRAM_BASE + 0x100,
> > +	.init_machine	= raumfeld_controller_init,
> > +	.map_io		= pxa_map_io,
> > +	.init_irq	= pxa3xx_init_irq,
> > +	.timer		= &pxa_timer,
> > +MACHINE_END
> > +#endif
> > +
> > +#ifdef CONFIG_MACH_RAUMFELD_CONNECTOR
> > +MACHINE_START(RAUMFELD_CONNECTOR, "Raumfeld Connector")
> > +	.phys_io	= 0x40000000,
> > +	.io_pg_offst	= (io_p2v(0x40000000) >> 18) & 0xfffc,
> > +	.boot_params	= RAUMFELD_SDRAM_BASE + 0x100,
> > +	.init_machine	= raumfeld_connector_init,
> > +	.map_io		= pxa_map_io,
> > +	.init_irq	= pxa3xx_init_irq,
> > +	.timer		= &pxa_timer,
> > +MACHINE_END
> > +#endif
> > +
> > +#ifdef CONFIG_MACH_RAUMFELD_SPEAKER
> > +MACHINE_START(RAUMFELD_SPEAKER, "Raumfeld Speaker")
> > +	.phys_io	= 0x40000000,
> > +	.io_pg_offst	= (io_p2v(0x40000000) >> 18) & 0xfffc,
> > +	.boot_params	= RAUMFELD_SDRAM_BASE + 0x100,
> > +	.init_machine	= raumfeld_speaker_init,
> > +	.map_io		= pxa_map_io,
> > +	.init_irq	= pxa3xx_init_irq,
> > +	.timer		= &pxa_timer,
> > +MACHINE_END
> > +#endif
>