Message-ID: <20110604222946.GA31236@ponder.secretlab.ca>
Date:	Sat, 4 Jun 2011 16:29:46 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Shawn Guo <shawn.guo@...aro.org>
Cc:	linux-kernel@...r.kernel.org, arnd@...db.de, kernel@...gutronix.de,
	linux-arm-kernel@...ts.infradead.org, patches@...aro.org
Subject: Re: [PATCH v3 1/3] gpio: gpio-mxs: copy mach-mxs/gpio.c into
 drivers/gpio

On Sat, Jun 04, 2011 at 06:55:38PM +0800, Shawn Guo wrote:
> As the first patch of the series that moves mach-mxc gpio driver into
> drivers/gpio, it copies arch/arm/mach-mxs/gpio.c into
> drivers/gpio/gpio-mxs.c.  The later patches will make necessary
> changes to the driver, migrate the existing users to it, and lastly
> deletes mach-mxs gpio driver.
> 
> Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
> ---
>  drivers/gpio/gpio-mxs.c |  331 +++++++++++++++++++++++++++++++++++++++++++++++

[sigh]  I fear we are having a communication breakdown.  Since your
/moving/ a file, you need to make it easy for readers to understand
what has changed and why.  That means using 1 patch to move the file
with only the changes absolutely necessary to ensure bisectability,
and then followup patches for the clean up.

Adding a new copy in one patch, and then removing the old copy in the
other patch does not make it easy for a reader to understand what
changed.  Below is what you're first patch should look like (using the
-M flag to show the actual changes which are only #include differences).

I've build tested this patch and have it sitting in the gpio/next
branch of git://git.secretlab.ca/git/linux-2.6 at the moment if you
want to build the rest of your series on top of it.

g.

---

commit e084f5b06ca7f3d94d9d042d288a3311398e5c49
Author: Grant Likely <grant.likely@...retlab.ca>
Date:   Sat Jun 4 16:18:59 2011 -0600

    gpio/mxs: Move Freescale mxs gpio driver to drivers/gpio
    
    GPIO drivers are getting moved to drivers/gpio for cleanup and
    consolidation.  This patch moves the mxs driver.  Follow up patches
    will clean it up and make it a fine upstanding example of a gpio
    driver.
    
    Signed-off-by: Grant Likely <grant.likely@...retlab.ca>

 arch/arm/mach-mxs/Makefile                         |    2 +-
 .../mach-mxs/{gpio.h => include/mach/gpio-mxs.h}   |    0
 arch/arm/mach-mxs/mach-mx28evk.c                   |    2 +-
 drivers/gpio/Kconfig                               |    4 ++++
 drivers/gpio/Makefile                              |    1 +
 .../arm/mach-mxs/gpio.c => drivers/gpio/gpio-mxs.c |    3 +--
 6 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/arch/arm/mach-mxs/Makefile b/arch/arm/mach-mxs/Makefile
index 58e8923..6c38262 100644
--- a/arch/arm/mach-mxs/Makefile
+++ b/arch/arm/mach-mxs/Makefile
@@ -1,5 +1,5 @@
 # Common support
-obj-y := clock.o devices.o gpio.o icoll.o iomux.o system.o timer.o
+obj-y := clock.o devices.o icoll.o iomux.o system.o timer.o
 
 obj-$(CONFIG_MXS_OCOTP) += ocotp.o
 obj-$(CONFIG_PM) += pm.o
diff --git a/arch/arm/mach-mxs/gpio.h b/arch/arm/mach-mxs/include/mach/gpio-mxs.h
similarity index 100%
rename from arch/arm/mach-mxs/gpio.h
rename to arch/arm/mach-mxs/include/mach/gpio-mxs.h
diff --git a/arch/arm/mach-mxs/mach-mx28evk.c b/arch/arm/mach-mxs/mach-mx28evk.c
index eacdc6b..347cf35 100644
--- a/arch/arm/mach-mxs/mach-mx28evk.c
+++ b/arch/arm/mach-mxs/mach-mx28evk.c
@@ -24,9 +24,9 @@
 
 #include <mach/common.h>
 #include <mach/iomux-mx28.h>
+#include <mach/gpio-mxs.h>
 
 #include "devices-mx28.h"
-#include "gpio.h"
 
 #define MX28EVK_FLEXCAN_SWITCH	MXS_GPIO_NR(2, 13)
 #define MX28EVK_FEC_PHY_POWER	MXS_GPIO_NR(2, 15)
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 21271a5..afe44aa 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -94,6 +94,10 @@ config GPIO_EXYNOS4
 	def_bool y
 	depends on CPU_EXYNOS4210
 
+config GPIO_MXS
+	def_bool y
+	depends on ARCH_MXS
+
 config GPIO_PLAT_SAMSUNG
 	def_bool y
 	depends on SAMSUNG_GPIOLIB_4BIT
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index e6e5032..8733d02 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_GPIO_BASIC_MMIO_CORE)	+= basic_mmio_gpio.o
 obj-$(CONFIG_GPIO_BASIC_MMIO)	+= basic_mmio_gpio.o
 obj-$(CONFIG_GPIO_EP93XX)	+= gpio-ep93xx.o
 obj-$(CONFIG_GPIO_EXYNOS4)	+= gpio-exynos4.o
+obj-$(CONFIG_GPIO_MXS)		+= gpio-mxs.o
 obj-$(CONFIG_GPIO_PLAT_SAMSUNG)	+= gpio-plat-samsung.o
 obj-$(CONFIG_GPIO_S5PC100)	+= gpio-s5pc100.o
 obj-$(CONFIG_GPIO_S5PV210)	+= gpio-s5pv210.o
diff --git a/arch/arm/mach-mxs/gpio.c b/drivers/gpio/gpio-mxs.c
similarity index 99%
rename from arch/arm/mach-mxs/gpio.c
rename to drivers/gpio/gpio-mxs.c
index 2c950fe..bac7b6b 100644
--- a/arch/arm/mach-mxs/gpio.c
+++ b/drivers/gpio/gpio-mxs.c
@@ -27,10 +27,9 @@
 #include <linux/gpio.h>
 #include <mach/mx23.h>
 #include <mach/mx28.h>
+#include <mach/gpio-mxs.h>
 #include <asm-generic/bug.h>
 
-#include "gpio.h"
-
 static struct mxs_gpio_port *mxs_gpio_ports;
 static int gpio_table_size;
 



>  1 files changed, 331 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/gpio/gpio-mxs.c
> 
> diff --git a/drivers/gpio/gpio-mxs.c b/drivers/gpio/gpio-mxs.c
> new file mode 100644
> index 0000000..2c950fe
> --- /dev/null
> +++ b/drivers/gpio/gpio-mxs.c
> @@ -0,0 +1,331 @@
> +/*
> + * MXC GPIO support. (c) 2008 Daniel Mack <daniel@...aq.de>
> + * Copyright 2008 Juergen Beisert, kernel@...gutronix.de
> + *
> + * Based on code from Freescale,
> + * Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * as published by the Free Software Foundation; either version 2
> + * of the License, or (at your option) any later version.
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
> + * MA  02110-1301, USA.
> + */
> +
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/irq.h>
> +#include <linux/gpio.h>
> +#include <mach/mx23.h>
> +#include <mach/mx28.h>
> +#include <asm-generic/bug.h>
> +
> +#include "gpio.h"
> +
> +static struct mxs_gpio_port *mxs_gpio_ports;
> +static int gpio_table_size;
> +
> +#define PINCTRL_DOUT(n)		((cpu_is_mx23() ? 0x0500 : 0x0700) + (n) * 0x10)
> +#define PINCTRL_DIN(n)		((cpu_is_mx23() ? 0x0600 : 0x0900) + (n) * 0x10)
> +#define PINCTRL_DOE(n)		((cpu_is_mx23() ? 0x0700 : 0x0b00) + (n) * 0x10)
> +#define PINCTRL_PIN2IRQ(n)	((cpu_is_mx23() ? 0x0800 : 0x1000) + (n) * 0x10)
> +#define PINCTRL_IRQEN(n)	((cpu_is_mx23() ? 0x0900 : 0x1100) + (n) * 0x10)
> +#define PINCTRL_IRQLEV(n)	((cpu_is_mx23() ? 0x0a00 : 0x1200) + (n) * 0x10)
> +#define PINCTRL_IRQPOL(n)	((cpu_is_mx23() ? 0x0b00 : 0x1300) + (n) * 0x10)
> +#define PINCTRL_IRQSTAT(n)	((cpu_is_mx23() ? 0x0c00 : 0x1400) + (n) * 0x10)
> +
> +#define GPIO_INT_FALL_EDGE	0x0
> +#define GPIO_INT_LOW_LEV	0x1
> +#define GPIO_INT_RISE_EDGE	0x2
> +#define GPIO_INT_HIGH_LEV	0x3
> +#define GPIO_INT_LEV_MASK	(1 << 0)
> +#define GPIO_INT_POL_MASK	(1 << 1)
> +
> +/* Note: This driver assumes 32 GPIOs are handled in one register */
> +
> +static void clear_gpio_irqstatus(struct mxs_gpio_port *port, u32 index)
> +{
> +	__mxs_clrl(1 << index, port->base + PINCTRL_IRQSTAT(port->id));
> +}
> +
> +static void set_gpio_irqenable(struct mxs_gpio_port *port, u32 index,
> +				int enable)
> +{
> +	if (enable) {
> +		__mxs_setl(1 << index, port->base + PINCTRL_IRQEN(port->id));
> +		__mxs_setl(1 << index, port->base + PINCTRL_PIN2IRQ(port->id));
> +	} else {
> +		__mxs_clrl(1 << index, port->base + PINCTRL_IRQEN(port->id));
> +	}
> +}
> +
> +static void mxs_gpio_ack_irq(struct irq_data *d)
> +{
> +	u32 gpio = irq_to_gpio(d->irq);
> +	clear_gpio_irqstatus(&mxs_gpio_ports[gpio / 32], gpio & 0x1f);
> +}
> +
> +static void mxs_gpio_mask_irq(struct irq_data *d)
> +{
> +	u32 gpio = irq_to_gpio(d->irq);
> +	set_gpio_irqenable(&mxs_gpio_ports[gpio / 32], gpio & 0x1f, 0);
> +}
> +
> +static void mxs_gpio_unmask_irq(struct irq_data *d)
> +{
> +	u32 gpio = irq_to_gpio(d->irq);
> +	set_gpio_irqenable(&mxs_gpio_ports[gpio / 32], gpio & 0x1f, 1);
> +}
> +
> +static int mxs_gpio_get(struct gpio_chip *chip, unsigned offset);
> +
> +static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
> +{
> +	u32 gpio = irq_to_gpio(d->irq);
> +	u32 pin_mask = 1 << (gpio & 31);
> +	struct mxs_gpio_port *port = &mxs_gpio_ports[gpio / 32];
> +	void __iomem *pin_addr;
> +	int edge;
> +
> +	switch (type) {
> +	case IRQ_TYPE_EDGE_RISING:
> +		edge = GPIO_INT_RISE_EDGE;
> +		break;
> +	case IRQ_TYPE_EDGE_FALLING:
> +		edge = GPIO_INT_FALL_EDGE;
> +		break;
> +	case IRQ_TYPE_LEVEL_LOW:
> +		edge = GPIO_INT_LOW_LEV;
> +		break;
> +	case IRQ_TYPE_LEVEL_HIGH:
> +		edge = GPIO_INT_HIGH_LEV;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	/* set level or edge */
> +	pin_addr = port->base + PINCTRL_IRQLEV(port->id);
> +	if (edge & GPIO_INT_LEV_MASK)
> +		__mxs_setl(pin_mask, pin_addr);
> +	else
> +		__mxs_clrl(pin_mask, pin_addr);
> +
> +	/* set polarity */
> +	pin_addr = port->base + PINCTRL_IRQPOL(port->id);
> +	if (edge & GPIO_INT_POL_MASK)
> +		__mxs_setl(pin_mask, pin_addr);
> +	else
> +		__mxs_clrl(pin_mask, pin_addr);
> +
> +	clear_gpio_irqstatus(port, gpio & 0x1f);
> +
> +	return 0;
> +}
> +
> +/* MXS has one interrupt *per* gpio port */
> +static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc)
> +{
> +	u32 irq_stat;
> +	struct mxs_gpio_port *port = (struct mxs_gpio_port *)irq_get_handler_data(irq);
> +	u32 gpio_irq_no_base = port->virtual_irq_start;
> +
> +	desc->irq_data.chip->irq_ack(&desc->irq_data);
> +
> +	irq_stat = __raw_readl(port->base + PINCTRL_IRQSTAT(port->id)) &
> +			__raw_readl(port->base + PINCTRL_IRQEN(port->id));
> +
> +	while (irq_stat != 0) {
> +		int irqoffset = fls(irq_stat) - 1;
> +		generic_handle_irq(gpio_irq_no_base + irqoffset);
> +		irq_stat &= ~(1 << irqoffset);
> +	}
> +}
> +
> +/*
> + * Set interrupt number "irq" in the GPIO as a wake-up source.
> + * While system is running, all registered GPIO interrupts need to have
> + * wake-up enabled. When system is suspended, only selected GPIO interrupts
> + * need to have wake-up enabled.
> + * @param  irq          interrupt source number
> + * @param  enable       enable as wake-up if equal to non-zero
> + * @return       This function returns 0 on success.
> + */
> +static int mxs_gpio_set_wake_irq(struct irq_data *d, unsigned int enable)
> +{
> +	u32 gpio = irq_to_gpio(d->irq);
> +	u32 gpio_idx = gpio & 0x1f;
> +	struct mxs_gpio_port *port = &mxs_gpio_ports[gpio / 32];
> +
> +	if (enable) {
> +		if (port->irq_high && (gpio_idx >= 16))
> +			enable_irq_wake(port->irq_high);
> +		else
> +			enable_irq_wake(port->irq);
> +	} else {
> +		if (port->irq_high && (gpio_idx >= 16))
> +			disable_irq_wake(port->irq_high);
> +		else
> +			disable_irq_wake(port->irq);
> +	}
> +
> +	return 0;
> +}
> +
> +static struct irq_chip gpio_irq_chip = {
> +	.name = "mxs gpio",
> +	.irq_ack = mxs_gpio_ack_irq,
> +	.irq_mask = mxs_gpio_mask_irq,
> +	.irq_unmask = mxs_gpio_unmask_irq,
> +	.irq_set_type = mxs_gpio_set_irq_type,
> +	.irq_set_wake = mxs_gpio_set_wake_irq,
> +};
> +
> +static void mxs_set_gpio_direction(struct gpio_chip *chip, unsigned offset,
> +				int dir)
> +{
> +	struct mxs_gpio_port *port =
> +		container_of(chip, struct mxs_gpio_port, chip);
> +	void __iomem *pin_addr = port->base + PINCTRL_DOE(port->id);
> +
> +	if (dir)
> +		__mxs_setl(1 << offset, pin_addr);
> +	else
> +		__mxs_clrl(1 << offset, pin_addr);
> +}
> +
> +static int mxs_gpio_get(struct gpio_chip *chip, unsigned offset)
> +{
> +	struct mxs_gpio_port *port =
> +		container_of(chip, struct mxs_gpio_port, chip);
> +
> +	return (__raw_readl(port->base + PINCTRL_DIN(port->id)) >> offset) & 1;
> +}
> +
> +static void mxs_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
> +{
> +	struct mxs_gpio_port *port =
> +		container_of(chip, struct mxs_gpio_port, chip);
> +	void __iomem *pin_addr = port->base + PINCTRL_DOUT(port->id);
> +
> +	if (value)
> +		__mxs_setl(1 << offset, pin_addr);
> +	else
> +		__mxs_clrl(1 << offset, pin_addr);
> +}
> +
> +static int mxs_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
> +{
> +	struct mxs_gpio_port *port =
> +		container_of(chip, struct mxs_gpio_port, chip);
> +
> +	return port->virtual_irq_start + offset;
> +}
> +
> +static int mxs_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
> +{
> +	mxs_set_gpio_direction(chip, offset, 0);
> +	return 0;
> +}
> +
> +static int mxs_gpio_direction_output(struct gpio_chip *chip,
> +				     unsigned offset, int value)
> +{
> +	mxs_gpio_set(chip, offset, value);
> +	mxs_set_gpio_direction(chip, offset, 1);
> +	return 0;
> +}
> +
> +int __init mxs_gpio_init(struct mxs_gpio_port *port, int cnt)
> +{
> +	int i, j;
> +
> +	/* save for local usage */
> +	mxs_gpio_ports = port;
> +	gpio_table_size = cnt;
> +
> +	pr_info("MXS GPIO hardware\n");
> +
> +	for (i = 0; i < cnt; i++) {
> +		/* disable the interrupt and clear the status */
> +		__raw_writel(0, port[i].base + PINCTRL_PIN2IRQ(i));
> +		__raw_writel(0, port[i].base + PINCTRL_IRQEN(i));
> +
> +		/* clear address has to be used to clear IRQSTAT bits */
> +		__mxs_clrl(~0U, port[i].base + PINCTRL_IRQSTAT(i));
> +
> +		for (j = port[i].virtual_irq_start;
> +			j < port[i].virtual_irq_start + 32; j++) {
> +			irq_set_chip_and_handler(j, &gpio_irq_chip,
> +						 handle_level_irq);
> +			set_irq_flags(j, IRQF_VALID);
> +		}
> +
> +		/* setup one handler for each entry */
> +		irq_set_chained_handler(port[i].irq, mxs_gpio_irq_handler);
> +		irq_set_handler_data(port[i].irq, &port[i]);
> +
> +		/* register gpio chip */
> +		port[i].chip.direction_input = mxs_gpio_direction_input;
> +		port[i].chip.direction_output = mxs_gpio_direction_output;
> +		port[i].chip.get = mxs_gpio_get;
> +		port[i].chip.set = mxs_gpio_set;
> +		port[i].chip.to_irq = mxs_gpio_to_irq;
> +		port[i].chip.base = i * 32;
> +		port[i].chip.ngpio = 32;
> +
> +		/* its a serious configuration bug when it fails */
> +		BUG_ON(gpiochip_add(&port[i].chip) < 0);
> +	}
> +
> +	return 0;
> +}
> +
> +#define MX23_GPIO_BASE	MX23_IO_ADDRESS(MX23_PINCTRL_BASE_ADDR)
> +#define MX28_GPIO_BASE	MX28_IO_ADDRESS(MX28_PINCTRL_BASE_ADDR)
> +
> +#define DEFINE_MXS_GPIO_PORT(_base, _irq, _id)				\
> +	{								\
> +		.chip.label = "gpio-" #_id,				\
> +		.id = _id,						\
> +		.irq = _irq,						\
> +		.base = _base,						\
> +		.virtual_irq_start = MXS_GPIO_IRQ_START + (_id) * 32,	\
> +	}
> +
> +#ifdef CONFIG_SOC_IMX23
> +static struct mxs_gpio_port mx23_gpio_ports[] = {
> +	DEFINE_MXS_GPIO_PORT(MX23_GPIO_BASE, MX23_INT_GPIO0, 0),
> +	DEFINE_MXS_GPIO_PORT(MX23_GPIO_BASE, MX23_INT_GPIO1, 1),
> +	DEFINE_MXS_GPIO_PORT(MX23_GPIO_BASE, MX23_INT_GPIO2, 2),
> +};
> +
> +int __init mx23_register_gpios(void)
> +{
> +	return mxs_gpio_init(mx23_gpio_ports, ARRAY_SIZE(mx23_gpio_ports));
> +}
> +#endif
> +
> +#ifdef CONFIG_SOC_IMX28
> +static struct mxs_gpio_port mx28_gpio_ports[] = {
> +	DEFINE_MXS_GPIO_PORT(MX28_GPIO_BASE, MX28_INT_GPIO0, 0),
> +	DEFINE_MXS_GPIO_PORT(MX28_GPIO_BASE, MX28_INT_GPIO1, 1),
> +	DEFINE_MXS_GPIO_PORT(MX28_GPIO_BASE, MX28_INT_GPIO2, 2),
> +	DEFINE_MXS_GPIO_PORT(MX28_GPIO_BASE, MX28_INT_GPIO3, 3),
> +	DEFINE_MXS_GPIO_PORT(MX28_GPIO_BASE, MX28_INT_GPIO4, 4),
> +};
> +
> +int __init mx28_register_gpios(void)
> +{
> +	return mxs_gpio_init(mx28_gpio_ports, ARRAY_SIZE(mx28_gpio_ports));
> +}
> +#endif
> -- 
> 1.7.4.1
> 
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