Re: [PATCH V3 1/3] GPIO: MIPS: lantiq: move gpio-stp and gpio-ebu to the subsystem folder

From: Grant Likely
Date: Thu May 17 2012 - 14:25:21 EST

On Wed, 16 May 2012 22:49:52 +0200, John Crispin <blogic@xxxxxxxxxxx> 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@xxxxxxxxxxx>
> Cc: Grant Likely <grant.likely@xxxxxxxxxxxx>
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> ---

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

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@xxxxxxxxxxx>
> - */
> -
> -#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@xxxxxxxxxxx>
> - *
> - */
> -
> -#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@xxxxxxxxxxx>
> + */
> +
> +#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@xxxxxxxxxxx>
> + *
> + */
> +
> +#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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