[PATCH 01/17] ARM: pxa/raumfeld: add basic structure for devices
Marek Vasut
marek.vasut at gmail.com
Wed Nov 25 11:51:40 EST 2009
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 <daniel at caiaq.de>
> > ---
> > 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 <daniel at caiaq.de>
> > + *
> > + * 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
>
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