Message-Id: <20120517182521.C874D3E0621@localhost>
Date:	Thu, 17 May 2012 12:25:21 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	John Crispin <blogic@...nwrt.org>
Cc:	linux-mips@...ux-mips.org, John Crispin <blogic@...nwrt.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 1/3] GPIO: MIPS: lantiq: move gpio-stp and gpio-ebu to the subsystem folder

On Wed, 16 May 2012 22:49:52 +0200, John Crispin <blogic@...nwrt.org> wrote:
> Move the 2 drivers from arch/mips/lantiq/xway/ to the subsystem and make them
> buildable.
> 
> The following 2 patches will convert the drivers to OF.
> 
> Signed-off-by: John Crispin <blogic@...nwrt.org>
> Cc: Grant Likely <grant.likely@...retlab.ca>
> Cc: linux-kernel@...r.kernel.org
> ---

Acked-by: Grant Likely <grant.likely@...retlab.ca>

Next time can you use the -M flag to git diff so that file moves show
up without a big diffstat?

Thanks,
g.

> This patch is part of a series moving the mips/lantiq target to OF and clkdev
> support. The patch, once Acked, should go upstream via Ralf's MIPS tree.
> 
>  arch/mips/lantiq/xway/Makefile   |    2 +-
>  arch/mips/lantiq/xway/gpio_ebu.c |  126 -------------------------------
>  arch/mips/lantiq/xway/gpio_stp.c |  152 --------------------------------------
>  drivers/gpio/Kconfig             |   18 +++++
>  drivers/gpio/Makefile            |    2 +
>  drivers/gpio/gpio-mm-lantiq.c    |  126 +++++++++++++++++++++++++++++++
>  drivers/gpio/gpio-stp-xway.c     |  152 ++++++++++++++++++++++++++++++++++++++
>  7 files changed, 299 insertions(+), 279 deletions(-)
>  delete mode 100644 arch/mips/lantiq/xway/gpio_ebu.c
>  delete mode 100644 arch/mips/lantiq/xway/gpio_stp.c
>  create mode 100644 drivers/gpio/gpio-mm-lantiq.c
>  create mode 100644 drivers/gpio/gpio-stp-xway.c
> 
> diff --git a/arch/mips/lantiq/xway/Makefile b/arch/mips/lantiq/xway/Makefile
> index edef6c5..dc3194f 100644
> --- a/arch/mips/lantiq/xway/Makefile
> +++ b/arch/mips/lantiq/xway/Makefile
> @@ -1 +1 @@
> -obj-y := prom.o sysctrl.o clk.o reset.o gpio.o gpio_stp.o gpio_ebu.o dma.o
> +obj-y := prom.o sysctrl.o clk.o reset.o gpio.o dma.o
> diff --git a/arch/mips/lantiq/xway/gpio_ebu.c b/arch/mips/lantiq/xway/gpio_ebu.c
> deleted file mode 100644
> index b91c7f1..0000000
> --- a/arch/mips/lantiq/xway/gpio_ebu.c
> +++ /dev/null
> @@ -1,126 +0,0 @@
> -/*
> - *  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.
> - *
> - *  Copyright (C) 2010 John Crispin <blogic@...nwrt.org>
> - */
> -
> -#include <linux/init.h>
> -#include <linux/export.h>
> -#include <linux/types.h>
> -#include <linux/platform_device.h>
> -#include <linux/mutex.h>
> -#include <linux/gpio.h>
> -#include <linux/io.h>
> -
> -#include <lantiq_soc.h>
> -
> -/*
> - * By attaching hardware latches to the EBU it is possible to create output
> - * only gpios. This driver configures a special memory address, which when
> - * written to outputs 16 bit to the latches.
> - */
> -
> -#define LTQ_EBU_BUSCON	0x1e7ff		/* 16 bit access, slowest timing */
> -#define LTQ_EBU_WP	0x80000000	/* write protect bit */
> -
> -/* we keep a shadow value of the last value written to the ebu */
> -static int ltq_ebu_gpio_shadow = 0x0;
> -static void __iomem *ltq_ebu_gpio_membase;
> -
> -static void ltq_ebu_apply(void)
> -{
> -	unsigned long flags;
> -
> -	spin_lock_irqsave(&ebu_lock, flags);
> -	ltq_ebu_w32(LTQ_EBU_BUSCON, LTQ_EBU_BUSCON1);
> -	*((__u16 *)ltq_ebu_gpio_membase) = ltq_ebu_gpio_shadow;
> -	ltq_ebu_w32(LTQ_EBU_BUSCON | LTQ_EBU_WP, LTQ_EBU_BUSCON1);
> -	spin_unlock_irqrestore(&ebu_lock, flags);
> -}
> -
> -static void ltq_ebu_set(struct gpio_chip *chip, unsigned offset, int value)
> -{
> -	if (value)
> -		ltq_ebu_gpio_shadow |= (1 << offset);
> -	else
> -		ltq_ebu_gpio_shadow &= ~(1 << offset);
> -	ltq_ebu_apply();
> -}
> -
> -static int ltq_ebu_direction_output(struct gpio_chip *chip, unsigned offset,
> -	int value)
> -{
> -	ltq_ebu_set(chip, offset, value);
> -
> -	return 0;
> -}
> -
> -static struct gpio_chip ltq_ebu_chip = {
> -	.label = "ltq_ebu",
> -	.direction_output = ltq_ebu_direction_output,
> -	.set = ltq_ebu_set,
> -	.base = 72,
> -	.ngpio = 16,
> -	.can_sleep = 1,
> -	.owner = THIS_MODULE,
> -};
> -
> -static int ltq_ebu_probe(struct platform_device *pdev)
> -{
> -	int ret = 0;
> -	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -
> -	if (!res) {
> -		dev_err(&pdev->dev, "failed to get memory resource\n");
> -		return -ENOENT;
> -	}
> -
> -	res = devm_request_mem_region(&pdev->dev, res->start,
> -		resource_size(res), dev_name(&pdev->dev));
> -	if (!res) {
> -		dev_err(&pdev->dev, "failed to request memory resource\n");
> -		return -EBUSY;
> -	}
> -
> -	ltq_ebu_gpio_membase = devm_ioremap_nocache(&pdev->dev, res->start,
> -		resource_size(res));
> -	if (!ltq_ebu_gpio_membase) {
> -		dev_err(&pdev->dev, "Failed to ioremap mem region\n");
> -		return -ENOMEM;
> -	}
> -
> -	/* grab the default shadow value passed form the platform code */
> -	ltq_ebu_gpio_shadow = (unsigned int) pdev->dev.platform_data;
> -
> -	/* tell the ebu controller which memory address we will be using */
> -	ltq_ebu_w32(pdev->resource->start | 0x1, LTQ_EBU_ADDRSEL1);
> -
> -	/* write protect the region */
> -	ltq_ebu_w32(LTQ_EBU_BUSCON | LTQ_EBU_WP, LTQ_EBU_BUSCON1);
> -
> -	ret = gpiochip_add(&ltq_ebu_chip);
> -	if (!ret)
> -		ltq_ebu_apply();
> -	return ret;
> -}
> -
> -static struct platform_driver ltq_ebu_driver = {
> -	.probe = ltq_ebu_probe,
> -	.driver = {
> -		.name = "ltq_ebu",
> -		.owner = THIS_MODULE,
> -	},
> -};
> -
> -static int __init ltq_ebu_init(void)
> -{
> -	int ret = platform_driver_register(&ltq_ebu_driver);
> -
> -	if (ret)
> -		pr_info("ltq_ebu : Error registering platfom driver!");
> -	return ret;
> -}
> -
> -postcore_initcall(ltq_ebu_init);
> diff --git a/arch/mips/lantiq/xway/gpio_stp.c b/arch/mips/lantiq/xway/gpio_stp.c
> deleted file mode 100644
> index d674f1b..0000000
> --- a/arch/mips/lantiq/xway/gpio_stp.c
> +++ /dev/null
> @@ -1,152 +0,0 @@
> -/*
> - *  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.
> - *
> - *  Copyright (C) 2007 John Crispin <blogic@...nwrt.org>
> - *
> - */
> -
> -#include <linux/slab.h>
> -#include <linux/init.h>
> -#include <linux/export.h>
> -#include <linux/types.h>
> -#include <linux/platform_device.h>
> -#include <linux/mutex.h>
> -#include <linux/io.h>
> -#include <linux/gpio.h>
> -
> -#include <lantiq_soc.h>
> -
> -#define LTQ_STP_CON0		0x00
> -#define LTQ_STP_CON1		0x04
> -#define LTQ_STP_CPU0		0x08
> -#define LTQ_STP_CPU1		0x0C
> -#define LTQ_STP_AR		0x10
> -
> -#define LTQ_STP_CON_SWU		(1 << 31)
> -#define LTQ_STP_2HZ		0
> -#define LTQ_STP_4HZ		(1 << 23)
> -#define LTQ_STP_8HZ		(2 << 23)
> -#define LTQ_STP_10HZ		(3 << 23)
> -#define LTQ_STP_SPEED_MASK	(0xf << 23)
> -#define LTQ_STP_UPD_FPI		(1 << 31)
> -#define LTQ_STP_UPD_MASK	(3 << 30)
> -#define LTQ_STP_ADSL_SRC	(3 << 24)
> -
> -#define LTQ_STP_GROUP0		(1 << 0)
> -
> -#define LTQ_STP_RISING		0
> -#define LTQ_STP_FALLING		(1 << 26)
> -#define LTQ_STP_EDGE_MASK	(1 << 26)
> -
> -#define ltq_stp_r32(reg)	__raw_readl(ltq_stp_membase + reg)
> -#define ltq_stp_w32(val, reg)	__raw_writel(val, ltq_stp_membase + reg)
> -#define ltq_stp_w32_mask(clear, set, reg) \
> -		ltq_w32((ltq_r32(ltq_stp_membase + reg) & ~(clear)) | (set), \
> -		ltq_stp_membase + (reg))
> -
> -static int ltq_stp_shadow = 0xffff;
> -static void __iomem *ltq_stp_membase;
> -
> -static void ltq_stp_set(struct gpio_chip *chip, unsigned offset, int value)
> -{
> -	if (value)
> -		ltq_stp_shadow |= (1 << offset);
> -	else
> -		ltq_stp_shadow &= ~(1 << offset);
> -	ltq_stp_w32(ltq_stp_shadow, LTQ_STP_CPU0);
> -}
> -
> -static int ltq_stp_direction_output(struct gpio_chip *chip, unsigned offset,
> -	int value)
> -{
> -	ltq_stp_set(chip, offset, value);
> -
> -	return 0;
> -}
> -
> -static struct gpio_chip ltq_stp_chip = {
> -	.label = "ltq_stp",
> -	.direction_output = ltq_stp_direction_output,
> -	.set = ltq_stp_set,
> -	.base = 48,
> -	.ngpio = 24,
> -	.can_sleep = 1,
> -	.owner = THIS_MODULE,
> -};
> -
> -static int ltq_stp_hw_init(void)
> -{
> -	/* sane defaults */
> -	ltq_stp_w32(0, LTQ_STP_AR);
> -	ltq_stp_w32(0, LTQ_STP_CPU0);
> -	ltq_stp_w32(0, LTQ_STP_CPU1);
> -	ltq_stp_w32(LTQ_STP_CON_SWU, LTQ_STP_CON0);
> -	ltq_stp_w32(0, LTQ_STP_CON1);
> -
> -	/* rising or falling edge */
> -	ltq_stp_w32_mask(LTQ_STP_EDGE_MASK, LTQ_STP_FALLING, LTQ_STP_CON0);
> -
> -	/* per default stp 15-0 are set */
> -	ltq_stp_w32_mask(0, LTQ_STP_GROUP0, LTQ_STP_CON1);
> -
> -	/* stp are update periodically by the FPI bus */
> -	ltq_stp_w32_mask(LTQ_STP_UPD_MASK, LTQ_STP_UPD_FPI, LTQ_STP_CON1);
> -
> -	/* set stp update speed */
> -	ltq_stp_w32_mask(LTQ_STP_SPEED_MASK, LTQ_STP_8HZ, LTQ_STP_CON1);
> -
> -	/* tell the hardware that pin (led) 0 and 1 are controlled
> -	 *  by the dsl arc
> -	 */
> -	ltq_stp_w32_mask(0, LTQ_STP_ADSL_SRC, LTQ_STP_CON0);
> -
> -	ltq_pmu_enable(PMU_LED);
> -	return 0;
> -}
> -
> -static int __devinit ltq_stp_probe(struct platform_device *pdev)
> -{
> -	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	int ret = 0;
> -
> -	if (!res)
> -		return -ENOENT;
> -	res = devm_request_mem_region(&pdev->dev, res->start,
> -		resource_size(res), dev_name(&pdev->dev));
> -	if (!res) {
> -		dev_err(&pdev->dev, "failed to request STP memory\n");
> -		return -EBUSY;
> -	}
> -	ltq_stp_membase = devm_ioremap_nocache(&pdev->dev, res->start,
> -		resource_size(res));
> -	if (!ltq_stp_membase) {
> -		dev_err(&pdev->dev, "failed to remap STP memory\n");
> -		return -ENOMEM;
> -	}
> -	ret = gpiochip_add(&ltq_stp_chip);
> -	if (!ret)
> -		ret = ltq_stp_hw_init();
> -
> -	return ret;
> -}
> -
> -static struct platform_driver ltq_stp_driver = {
> -	.probe = ltq_stp_probe,
> -	.driver = {
> -		.name = "ltq_stp",
> -		.owner = THIS_MODULE,
> -	},
> -};
> -
> -int __init ltq_stp_init(void)
> -{
> -	int ret = platform_driver_register(&ltq_stp_driver);
> -
> -	if (ret)
> -		pr_info("ltq_stp: error registering platfom driver");
> -	return ret;
> -}
> -
> -postcore_initcall(ltq_stp_init);
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index e03653d..8fae079 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -96,6 +96,14 @@ config GPIO_EP93XX
>  	depends on ARCH_EP93XX
>  	select GPIO_GENERIC
>  
> +config GPIO_MM_LANTIQ
> +	bool "Lantiq Memory mapped GPIOs"
> +	depends on LANTIQ && SOC_XWAY
> +	help
> +	  This enables support for memory mapped GPIOs on the External Bus Unit
> +	  (EBU) found on Lantiq SoCs. The gpios are output only as they are
> +	  created by attaching a 16bit latch to the bus.
> +
>  config GPIO_MPC5200
>  	def_bool y
>  	depends on PPC_MPC52xx
> @@ -306,6 +314,16 @@ config GPIO_STMPE
>  	  This enables support for the GPIOs found on the STMPE I/O
>  	  Expanders.
>  
> +config GPIO_STP_XWAY
> +	bool "XWAY STP GPIOs"
> +	depends on SOC_XWAY
> +	help
> +	  This enables support for the Serial To Parallel (STP) unit found on
> +	  XWAY SoC. The STP allows the SoC to drive a shift registers cascade,
> +	  that can be up to 24 bit. This peripheral is aimed at driving leds.
> +	  Some of the gpios/leds can be auto updated by the soc with dsl and
> +	  phy status.
> +
>  config GPIO_TC3589X
>  	bool "TC3589X GPIOs"
>  	depends on MFD_TC3589X
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 007f54b..ed1c96d 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -30,6 +30,7 @@ obj-$(CONFIG_GPIO_MC33880)	+= gpio-mc33880.o
>  obj-$(CONFIG_GPIO_MC9S08DZ60)	+= gpio-mc9s08dz60.o
>  obj-$(CONFIG_GPIO_MCP23S08)	+= gpio-mcp23s08.o
>  obj-$(CONFIG_GPIO_ML_IOH)	+= gpio-ml-ioh.o
> +obj-$(CONFIG_GPIO_MM_LANTIQ)	+= gpio-mm-lantiq.o
>  obj-$(CONFIG_GPIO_MPC5200)	+= gpio-mpc5200.o
>  obj-$(CONFIG_GPIO_MPC8XXX)	+= gpio-mpc8xxx.o
>  obj-$(CONFIG_GPIO_MSM_V1)	+= gpio-msm-v1.o
> @@ -49,6 +50,7 @@ obj-$(CONFIG_ARCH_SA1100)	+= gpio-sa1100.o
>  obj-$(CONFIG_GPIO_SCH)		+= gpio-sch.o
>  obj-$(CONFIG_GPIO_SODAVILLE)	+= gpio-sodaville.o
>  obj-$(CONFIG_GPIO_STMPE)	+= gpio-stmpe.o
> +obj-$(CONFIG_GPIO_STP_XWAY)	+= gpio-stp-xway.o
>  obj-$(CONFIG_GPIO_SX150X)	+= gpio-sx150x.o
>  obj-$(CONFIG_GPIO_TC3589X)	+= gpio-tc3589x.o
>  obj-$(CONFIG_ARCH_TEGRA)	+= gpio-tegra.o
> diff --git a/drivers/gpio/gpio-mm-lantiq.c b/drivers/gpio/gpio-mm-lantiq.c
> new file mode 100644
> index 0000000..b91c7f1
> --- /dev/null
> +++ b/drivers/gpio/gpio-mm-lantiq.c
> @@ -0,0 +1,126 @@
> +/*
> + *  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.
> + *
> + *  Copyright (C) 2010 John Crispin <blogic@...nwrt.org>
> + */
> +
> +#include <linux/init.h>
> +#include <linux/export.h>
> +#include <linux/types.h>
> +#include <linux/platform_device.h>
> +#include <linux/mutex.h>
> +#include <linux/gpio.h>
> +#include <linux/io.h>
> +
> +#include <lantiq_soc.h>
> +
> +/*
> + * By attaching hardware latches to the EBU it is possible to create output
> + * only gpios. This driver configures a special memory address, which when
> + * written to outputs 16 bit to the latches.
> + */
> +
> +#define LTQ_EBU_BUSCON	0x1e7ff		/* 16 bit access, slowest timing */
> +#define LTQ_EBU_WP	0x80000000	/* write protect bit */
> +
> +/* we keep a shadow value of the last value written to the ebu */
> +static int ltq_ebu_gpio_shadow = 0x0;
> +static void __iomem *ltq_ebu_gpio_membase;
> +
> +static void ltq_ebu_apply(void)
> +{
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&ebu_lock, flags);
> +	ltq_ebu_w32(LTQ_EBU_BUSCON, LTQ_EBU_BUSCON1);
> +	*((__u16 *)ltq_ebu_gpio_membase) = ltq_ebu_gpio_shadow;
> +	ltq_ebu_w32(LTQ_EBU_BUSCON | LTQ_EBU_WP, LTQ_EBU_BUSCON1);
> +	spin_unlock_irqrestore(&ebu_lock, flags);
> +}
> +
> +static void ltq_ebu_set(struct gpio_chip *chip, unsigned offset, int value)
> +{
> +	if (value)
> +		ltq_ebu_gpio_shadow |= (1 << offset);
> +	else
> +		ltq_ebu_gpio_shadow &= ~(1 << offset);
> +	ltq_ebu_apply();
> +}
> +
> +static int ltq_ebu_direction_output(struct gpio_chip *chip, unsigned offset,
> +	int value)
> +{
> +	ltq_ebu_set(chip, offset, value);
> +
> +	return 0;
> +}
> +
> +static struct gpio_chip ltq_ebu_chip = {
> +	.label = "ltq_ebu",
> +	.direction_output = ltq_ebu_direction_output,
> +	.set = ltq_ebu_set,
> +	.base = 72,
> +	.ngpio = 16,
> +	.can_sleep = 1,
> +	.owner = THIS_MODULE,
> +};
> +
> +static int ltq_ebu_probe(struct platform_device *pdev)
> +{
> +	int ret = 0;
> +	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +
> +	if (!res) {
> +		dev_err(&pdev->dev, "failed to get memory resource\n");
> +		return -ENOENT;
> +	}
> +
> +	res = devm_request_mem_region(&pdev->dev, res->start,
> +		resource_size(res), dev_name(&pdev->dev));
> +	if (!res) {
> +		dev_err(&pdev->dev, "failed to request memory resource\n");
> +		return -EBUSY;
> +	}
> +
> +	ltq_ebu_gpio_membase = devm_ioremap_nocache(&pdev->dev, res->start,
> +		resource_size(res));
> +	if (!ltq_ebu_gpio_membase) {
> +		dev_err(&pdev->dev, "Failed to ioremap mem region\n");
> +		return -ENOMEM;
> +	}
> +
> +	/* grab the default shadow value passed form the platform code */
> +	ltq_ebu_gpio_shadow = (unsigned int) pdev->dev.platform_data;
> +
> +	/* tell the ebu controller which memory address we will be using */
> +	ltq_ebu_w32(pdev->resource->start | 0x1, LTQ_EBU_ADDRSEL1);
> +
> +	/* write protect the region */
> +	ltq_ebu_w32(LTQ_EBU_BUSCON | LTQ_EBU_WP, LTQ_EBU_BUSCON1);
> +
> +	ret = gpiochip_add(&ltq_ebu_chip);
> +	if (!ret)
> +		ltq_ebu_apply();
> +	return ret;
> +}
> +
> +static struct platform_driver ltq_ebu_driver = {
> +	.probe = ltq_ebu_probe,
> +	.driver = {
> +		.name = "ltq_ebu",
> +		.owner = THIS_MODULE,
> +	},
> +};
> +
> +static int __init ltq_ebu_init(void)
> +{
> +	int ret = platform_driver_register(&ltq_ebu_driver);
> +
> +	if (ret)
> +		pr_info("ltq_ebu : Error registering platfom driver!");
> +	return ret;
> +}
> +
> +postcore_initcall(ltq_ebu_init);
> diff --git a/drivers/gpio/gpio-stp-xway.c b/drivers/gpio/gpio-stp-xway.c
> new file mode 100644
> index 0000000..d674f1b
> --- /dev/null
> +++ b/drivers/gpio/gpio-stp-xway.c
> @@ -0,0 +1,152 @@
> +/*
> + *  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.
> + *
> + *  Copyright (C) 2007 John Crispin <blogic@...nwrt.org>
> + *
> + */
> +
> +#include <linux/slab.h>
> +#include <linux/init.h>
> +#include <linux/export.h>
> +#include <linux/types.h>
> +#include <linux/platform_device.h>
> +#include <linux/mutex.h>
> +#include <linux/io.h>
> +#include <linux/gpio.h>
> +
> +#include <lantiq_soc.h>
> +
> +#define LTQ_STP_CON0		0x00
> +#define LTQ_STP_CON1		0x04
> +#define LTQ_STP_CPU0		0x08
> +#define LTQ_STP_CPU1		0x0C
> +#define LTQ_STP_AR		0x10
> +
> +#define LTQ_STP_CON_SWU		(1 << 31)
> +#define LTQ_STP_2HZ		0
> +#define LTQ_STP_4HZ		(1 << 23)
> +#define LTQ_STP_8HZ		(2 << 23)
> +#define LTQ_STP_10HZ		(3 << 23)
> +#define LTQ_STP_SPEED_MASK	(0xf << 23)
> +#define LTQ_STP_UPD_FPI		(1 << 31)
> +#define LTQ_STP_UPD_MASK	(3 << 30)
> +#define LTQ_STP_ADSL_SRC	(3 << 24)
> +
> +#define LTQ_STP_GROUP0		(1 << 0)
> +
> +#define LTQ_STP_RISING		0
> +#define LTQ_STP_FALLING		(1 << 26)
> +#define LTQ_STP_EDGE_MASK	(1 << 26)
> +
> +#define ltq_stp_r32(reg)	__raw_readl(ltq_stp_membase + reg)
> +#define ltq_stp_w32(val, reg)	__raw_writel(val, ltq_stp_membase + reg)
> +#define ltq_stp_w32_mask(clear, set, reg) \
> +		ltq_w32((ltq_r32(ltq_stp_membase + reg) & ~(clear)) | (set), \
> +		ltq_stp_membase + (reg))
> +
> +static int ltq_stp_shadow = 0xffff;
> +static void __iomem *ltq_stp_membase;
> +
> +static void ltq_stp_set(struct gpio_chip *chip, unsigned offset, int value)
> +{
> +	if (value)
> +		ltq_stp_shadow |= (1 << offset);
> +	else
> +		ltq_stp_shadow &= ~(1 << offset);
> +	ltq_stp_w32(ltq_stp_shadow, LTQ_STP_CPU0);
> +}
> +
> +static int ltq_stp_direction_output(struct gpio_chip *chip, unsigned offset,
> +	int value)
> +{
> +	ltq_stp_set(chip, offset, value);
> +
> +	return 0;
> +}
> +
> +static struct gpio_chip ltq_stp_chip = {
> +	.label = "ltq_stp",
> +	.direction_output = ltq_stp_direction_output,
> +	.set = ltq_stp_set,
> +	.base = 48,
> +	.ngpio = 24,
> +	.can_sleep = 1,
> +	.owner = THIS_MODULE,
> +};
> +
> +static int ltq_stp_hw_init(void)
> +{
> +	/* sane defaults */
> +	ltq_stp_w32(0, LTQ_STP_AR);
> +	ltq_stp_w32(0, LTQ_STP_CPU0);
> +	ltq_stp_w32(0, LTQ_STP_CPU1);
> +	ltq_stp_w32(LTQ_STP_CON_SWU, LTQ_STP_CON0);
> +	ltq_stp_w32(0, LTQ_STP_CON1);
> +
> +	/* rising or falling edge */
> +	ltq_stp_w32_mask(LTQ_STP_EDGE_MASK, LTQ_STP_FALLING, LTQ_STP_CON0);
> +
> +	/* per default stp 15-0 are set */
> +	ltq_stp_w32_mask(0, LTQ_STP_GROUP0, LTQ_STP_CON1);
> +
> +	/* stp are update periodically by the FPI bus */
> +	ltq_stp_w32_mask(LTQ_STP_UPD_MASK, LTQ_STP_UPD_FPI, LTQ_STP_CON1);
> +
> +	/* set stp update speed */
> +	ltq_stp_w32_mask(LTQ_STP_SPEED_MASK, LTQ_STP_8HZ, LTQ_STP_CON1);
> +
> +	/* tell the hardware that pin (led) 0 and 1 are controlled
> +	 *  by the dsl arc
> +	 */
> +	ltq_stp_w32_mask(0, LTQ_STP_ADSL_SRC, LTQ_STP_CON0);
> +
> +	ltq_pmu_enable(PMU_LED);
> +	return 0;
> +}
> +
> +static int __devinit ltq_stp_probe(struct platform_device *pdev)
> +{
> +	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	int ret = 0;
> +
> +	if (!res)
> +		return -ENOENT;
> +	res = devm_request_mem_region(&pdev->dev, res->start,
> +		resource_size(res), dev_name(&pdev->dev));
> +	if (!res) {
> +		dev_err(&pdev->dev, "failed to request STP memory\n");
> +		return -EBUSY;
> +	}
> +	ltq_stp_membase = devm_ioremap_nocache(&pdev->dev, res->start,
> +		resource_size(res));
> +	if (!ltq_stp_membase) {
> +		dev_err(&pdev->dev, "failed to remap STP memory\n");
> +		return -ENOMEM;
> +	}
> +	ret = gpiochip_add(&ltq_stp_chip);
> +	if (!ret)
> +		ret = ltq_stp_hw_init();
> +
> +	return ret;
> +}
> +
> +static struct platform_driver ltq_stp_driver = {
> +	.probe = ltq_stp_probe,
> +	.driver = {
> +		.name = "ltq_stp",
> +		.owner = THIS_MODULE,
> +	},
> +};
> +
> +int __init ltq_stp_init(void)
> +{
> +	int ret = platform_driver_register(&ltq_stp_driver);
> +
> +	if (ret)
> +		pr_info("ltq_stp: error registering platfom driver");
> +	return ret;
> +}
> +
> +postcore_initcall(ltq_stp_init);
> -- 
> 1.7.9.1
> 

-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.
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