linux/arch/arm/plat-mxc/iomux-v1.c
Uwe Kleine-König bac3fcfad5 arm/imx/iomux-v1: check for invalid modes in mxc_gpio_mode
mxc_gpio_mode checks for invalid pins and so it returns zero for
success, -EINVAL for invalid pins.

While at it, remove definitions of GPIO_PORT_MAX removed as they are
unused now.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
2010-02-24 10:07:16 +01:00

239 lines
5.8 KiB
C

/*
* arch/arm/plat-mxc/iomux-v1.c
*
* Copyright (C) 2004 Sascha Hauer, Synertronixx GmbH
* Copyright (C) 2009 Uwe Kleine-Koenig, Pengutronix
*
* Common code for i.MX1, i.MX21 and i.MX27
*
* 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 St, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/gpio.h>
#include <mach/hardware.h>
#include <asm/mach/map.h>
#include <mach/iomux-v1.h>
static void __iomem *imx_iomuxv1_baseaddr;
static unsigned imx_iomuxv1_numports;
static inline unsigned long imx_iomuxv1_readl(unsigned offset)
{
return __raw_readl(imx_iomuxv1_baseaddr + offset);
}
static inline void imx_iomuxv1_writel(unsigned long val, unsigned offset)
{
__raw_writel(val, imx_iomuxv1_baseaddr + offset);
}
static inline void imx_iomuxv1_rmwl(unsigned offset,
unsigned long mask, unsigned long value)
{
unsigned long reg = imx_iomuxv1_readl(offset);
reg &= ~mask;
reg |= value;
imx_iomuxv1_writel(reg, offset);
}
static inline void imx_iomuxv1_set_puen(
unsigned int port, unsigned int pin, int on)
{
unsigned long mask = 1 << pin;
imx_iomuxv1_rmwl(MXC_PUEN(port), mask, on ? mask : 0);
}
static inline void imx_iomuxv1_set_ddir(
unsigned int port, unsigned int pin, int out)
{
unsigned long mask = 1 << pin;
imx_iomuxv1_rmwl(MXC_DDIR(port), mask, out ? mask : 0);
}
static inline void imx_iomuxv1_set_gpr(
unsigned int port, unsigned int pin, int af)
{
unsigned long mask = 1 << pin;
imx_iomuxv1_rmwl(MXC_GPR(port), mask, af ? mask : 0);
}
static inline void imx_iomuxv1_set_gius(
unsigned int port, unsigned int pin, int inuse)
{
unsigned long mask = 1 << pin;
imx_iomuxv1_rmwl(MXC_GIUS(port), mask, inuse ? mask : 0);
}
static inline void imx_iomuxv1_set_ocr(
unsigned int port, unsigned int pin, unsigned int ocr)
{
unsigned long shift = (pin & 0xf) << 1;
unsigned long mask = 3 << shift;
unsigned long value = ocr << shift;
unsigned long offset = pin < 16 ? MXC_OCR1(port) : MXC_OCR2(port);
imx_iomuxv1_rmwl(offset, mask, value);
}
static inline void imx_iomuxv1_set_iconfa(
unsigned int port, unsigned int pin, unsigned int aout)
{
unsigned long shift = (pin & 0xf) << 1;
unsigned long mask = 3 << shift;
unsigned long value = aout << shift;
unsigned long offset = pin < 16 ? MXC_ICONFA1(port) : MXC_ICONFA2(port);
imx_iomuxv1_rmwl(offset, mask, value);
}
static inline void imx_iomuxv1_set_iconfb(
unsigned int port, unsigned int pin, unsigned int bout)
{
unsigned long shift = (pin & 0xf) << 1;
unsigned long mask = 3 << shift;
unsigned long value = bout << shift;
unsigned long offset = pin < 16 ? MXC_ICONFB1(port) : MXC_ICONFB2(port);
imx_iomuxv1_rmwl(offset, mask, value);
}
int mxc_gpio_mode(int gpio_mode)
{
unsigned int pin = gpio_mode & GPIO_PIN_MASK;
unsigned int port = (gpio_mode & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
unsigned int ocr = (gpio_mode & GPIO_OCR_MASK) >> GPIO_OCR_SHIFT;
unsigned int aout = (gpio_mode >> GPIO_AOUT_SHIFT) & 3;
unsigned int bout = (gpio_mode >> GPIO_BOUT_SHIFT) & 3;
if (port >= imx_iomuxv1_numports)
return -EINVAL;
/* Pullup enable */
imx_iomuxv1_set_puen(port, pin, gpio_mode & GPIO_PUEN);
/* Data direction */
imx_iomuxv1_set_ddir(port, pin, gpio_mode & GPIO_OUT);
/* Primary / alternate function */
imx_iomuxv1_set_gpr(port, pin, gpio_mode & GPIO_AF);
/* use as gpio? */
imx_iomuxv1_set_gius(port, pin, !(gpio_mode & (GPIO_PF | GPIO_AF)));
imx_iomuxv1_set_ocr(port, pin, ocr);
imx_iomuxv1_set_iconfa(port, pin, aout);
imx_iomuxv1_set_iconfb(port, pin, bout);
return 0;
}
EXPORT_SYMBOL(mxc_gpio_mode);
static int imx_iomuxv1_setup_multiple(const int *list, unsigned count)
{
size_t i;
int ret;
for (i = 0; i < count; ++i) {
ret = mxc_gpio_mode(list[i]);
if (ret)
return ret;
}
return ret;
}
int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
const char *label)
{
size_t i;
int ret;
for (i = 0; i < count; ++i) {
unsigned gpio = pin_list[i] & (GPIO_PIN_MASK | GPIO_PORT_MASK);
ret = gpio_request(gpio, label);
if (ret)
goto err_gpio_request;
}
ret = imx_iomuxv1_setup_multiple(pin_list, count);
if (ret)
goto err_setup;
return 0;
err_setup:
BUG_ON(i != count);
err_gpio_request:
mxc_gpio_release_multiple_pins(pin_list, i);
return ret;
}
EXPORT_SYMBOL(mxc_gpio_setup_multiple_pins);
void mxc_gpio_release_multiple_pins(const int *pin_list, int count)
{
size_t i;
for (i = 0; i < count; ++i) {
unsigned gpio = pin_list[i] & (GPIO_PIN_MASK | GPIO_PORT_MASK);
gpio_free(gpio);
}
}
EXPORT_SYMBOL(mxc_gpio_release_multiple_pins);
static int imx_iomuxv1_init(void)
{
#ifdef CONFIG_ARCH_MX1
if (cpu_is_mx1()) {
imx_iomuxv1_baseaddr = MX1_IO_ADDRESS(MX1_GPIO_BASE_ADDR);
imx_iomuxv1_numports = MX1_NUM_GPIO_PORT;
} else
#endif
#ifdef CONFIG_MACH_MX21
if (cpu_is_mx21()) {
imx_iomuxv1_baseaddr = MX21_IO_ADDRESS(MX21_GPIO_BASE_ADDR);
imx_iomuxv1_numports = MX21_NUM_GPIO_PORT;
} else
#endif
#ifdef CONFIG_MACH_MX27
if (cpu_is_mx27()) {
imx_iomuxv1_baseaddr = MX27_IO_ADDRESS(MX27_GPIO_BASE_ADDR);
imx_iomuxv1_numports = MX27_NUM_GPIO_PORT;
} else
#endif
return -ENODEV;
return 0;
}
pure_initcall(imx_iomuxv1_init);