188 lines
4.7 KiB
C
188 lines
4.7 KiB
C
/*
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* arch/arm/plat-mxc/iomux-v1.c
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*
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* Copyright (C) 2004 Sascha Hauer, Synertronixx GmbH
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* Copyright (C) 2009 Uwe Kleine-Koenig, Pengutronix
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*
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* Common code for i.MX1, i.MX21 and i.MX27
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/gpio.h>
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#include <asm/mach/map.h>
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#include "hardware.h"
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#include "iomux-v1.h"
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static void __iomem *imx_iomuxv1_baseaddr;
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static unsigned imx_iomuxv1_numports;
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static inline unsigned long imx_iomuxv1_readl(unsigned offset)
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{
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return imx_readl(imx_iomuxv1_baseaddr + offset);
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}
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static inline void imx_iomuxv1_writel(unsigned long val, unsigned offset)
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{
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imx_writel(val, imx_iomuxv1_baseaddr + offset);
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}
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static inline void imx_iomuxv1_rmwl(unsigned offset,
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unsigned long mask, unsigned long value)
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{
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unsigned long reg = imx_iomuxv1_readl(offset);
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reg &= ~mask;
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reg |= value;
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imx_iomuxv1_writel(reg, offset);
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}
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static inline void imx_iomuxv1_set_puen(
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unsigned int port, unsigned int pin, int on)
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{
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unsigned long mask = 1 << pin;
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imx_iomuxv1_rmwl(MXC_PUEN(port), mask, on ? mask : 0);
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}
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static inline void imx_iomuxv1_set_ddir(
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unsigned int port, unsigned int pin, int out)
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{
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unsigned long mask = 1 << pin;
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imx_iomuxv1_rmwl(MXC_DDIR(port), mask, out ? mask : 0);
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}
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static inline void imx_iomuxv1_set_gpr(
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unsigned int port, unsigned int pin, int af)
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{
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unsigned long mask = 1 << pin;
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imx_iomuxv1_rmwl(MXC_GPR(port), mask, af ? mask : 0);
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}
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static inline void imx_iomuxv1_set_gius(
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unsigned int port, unsigned int pin, int inuse)
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{
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unsigned long mask = 1 << pin;
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imx_iomuxv1_rmwl(MXC_GIUS(port), mask, inuse ? mask : 0);
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}
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static inline void imx_iomuxv1_set_ocr(
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unsigned int port, unsigned int pin, unsigned int ocr)
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{
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unsigned long shift = (pin & 0xf) << 1;
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unsigned long mask = 3 << shift;
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unsigned long value = ocr << shift;
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unsigned long offset = pin < 16 ? MXC_OCR1(port) : MXC_OCR2(port);
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imx_iomuxv1_rmwl(offset, mask, value);
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}
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static inline void imx_iomuxv1_set_iconfa(
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unsigned int port, unsigned int pin, unsigned int aout)
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{
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unsigned long shift = (pin & 0xf) << 1;
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unsigned long mask = 3 << shift;
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unsigned long value = aout << shift;
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unsigned long offset = pin < 16 ? MXC_ICONFA1(port) : MXC_ICONFA2(port);
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imx_iomuxv1_rmwl(offset, mask, value);
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}
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static inline void imx_iomuxv1_set_iconfb(
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unsigned int port, unsigned int pin, unsigned int bout)
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{
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unsigned long shift = (pin & 0xf) << 1;
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unsigned long mask = 3 << shift;
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unsigned long value = bout << shift;
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unsigned long offset = pin < 16 ? MXC_ICONFB1(port) : MXC_ICONFB2(port);
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imx_iomuxv1_rmwl(offset, mask, value);
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}
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int mxc_gpio_mode(int gpio_mode)
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{
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unsigned int pin = gpio_mode & GPIO_PIN_MASK;
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unsigned int port = (gpio_mode & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
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unsigned int ocr = (gpio_mode & GPIO_OCR_MASK) >> GPIO_OCR_SHIFT;
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unsigned int aout = (gpio_mode >> GPIO_AOUT_SHIFT) & 3;
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unsigned int bout = (gpio_mode >> GPIO_BOUT_SHIFT) & 3;
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if (port >= imx_iomuxv1_numports)
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return -EINVAL;
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/* Pullup enable */
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imx_iomuxv1_set_puen(port, pin, gpio_mode & GPIO_PUEN);
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/* Data direction */
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imx_iomuxv1_set_ddir(port, pin, gpio_mode & GPIO_OUT);
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/* Primary / alternate function */
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imx_iomuxv1_set_gpr(port, pin, gpio_mode & GPIO_AF);
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/* use as gpio? */
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imx_iomuxv1_set_gius(port, pin, !(gpio_mode & (GPIO_PF | GPIO_AF)));
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imx_iomuxv1_set_ocr(port, pin, ocr);
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imx_iomuxv1_set_iconfa(port, pin, aout);
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imx_iomuxv1_set_iconfb(port, pin, bout);
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return 0;
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}
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static int imx_iomuxv1_setup_multiple(const int *list, unsigned count)
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{
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size_t i;
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int ret = 0;
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for (i = 0; i < count; ++i) {
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ret = mxc_gpio_mode(list[i]);
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if (ret)
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return ret;
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}
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return ret;
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}
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int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
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const char *label)
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{
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int ret;
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ret = imx_iomuxv1_setup_multiple(pin_list, count);
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return ret;
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}
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int __init imx_iomuxv1_init(void __iomem *base, int numports)
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{
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imx_iomuxv1_baseaddr = base;
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imx_iomuxv1_numports = numports;
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return 0;
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}
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