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/*
* Copyright (C) 2009-2010 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/kernel.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <mach/pinctrl.h>
#include "regs-pinctrl.h"
#define PINCTRL_BASE_ADDR IO_ADDRESS(PINCTRL_PHYS_ADDR)
static int
mx28_pin2id(struct pinctrl_chip *chip, unsigned int pin, unsigned int *id)
{
int bank;
bank = MXS_PIN_TO_BANK(pin & MXS_GPIO_MASK);
if (bank == MXS_PIN_BANK_MAX)
return -EINVAL;
*id = MXS_PIN_TO_PINID(pin & MXS_GPIO_MASK);
return bank;
}
static unsigned int mx28_get_gpio(struct pin_bank *bank, unsigned int id)
{
if (bank->gpio_port >= MXS_NON_GPIO)
return -EINVAL;
return bank->gpio_port * PINS_PER_BANK + id;
}
static void mx28_set_strength(struct pin_bank *bank,
unsigned int id, enum pad_strength strength)
{
void __iomem *addr;
addr = PINCTRL_BASE_ADDR + HW_PINCTRL_DRIVE0;
addr += 0x40 * bank->id + 0x10 * (id >> 3);
id &= 0x7;
id *= 4;
__raw_writel(PAD_CLEAR << id, addr + CLR_REGISTER);
__raw_writel(strength << id, addr + SET_REGISTER);
}
static void mx28_set_voltage(struct pin_bank *bank,
unsigned int id, enum pad_voltage volt)
{
void __iomem *addr;
addr = PINCTRL_BASE_ADDR + HW_PINCTRL_DRIVE0;
addr += 0x40 * bank->id + 0x10 * (id >> 3);
id &= 0x7;
id = id * 4 + 2;
if (volt == PAD_1_8V)
__raw_writel(1 << id, addr + CLR_REGISTER);
else
__raw_writel(1 << id, addr + SET_REGISTER);
}
static void mx28_set_pullup(struct pin_bank *bank, unsigned int id, int pullup)
{
void __iomem *addr;
addr = PINCTRL_BASE_ADDR + HW_PINCTRL_PULL0;
addr += 0x10 * bank->id;
if (pullup)
__raw_writel(1 << id, addr + SET_REGISTER);
else
__raw_writel(1 << id, addr + CLR_REGISTER);
}
static void mx28_set_type(struct pin_bank *bank,
unsigned int id, enum pin_fun cfg)
{
void __iomem *addr;
addr = PINCTRL_BASE_ADDR + HW_PINCTRL_MUXSEL0;
addr += 0x20 * bank->id + 0x10 * (id >> 4);
id &= 0xF;
id *= 2;
__raw_writel(0x3 << id, addr + CLR_REGISTER);
__raw_writel(cfg << id, addr + SET_REGISTER);
}
static int mx28_get_type(struct pin_bank *bank,
unsigned int id)
{
void __iomem *addr;
int ret;
addr = PINCTRL_BASE_ADDR + HW_PINCTRL_MUXSEL0;
addr += 0x20 * bank->id + 0x10 * (id >> 4);
id &= 0xF;
id *= 2;
ret = (__raw_readl(addr) >> id) & 0x3;
return ret;
}
static struct pin_bank mx28_pin_banks[6] = {
[0] = {
.id = 0,
.gpio_port = 0,
},
[1] = {
.id = 1,
.gpio_port = 1,
},
[2] = {
.id = 2,
.gpio_port = 2,
},
[3] = {
.id = 3,
.gpio_port = 3,
},
[4] = {
.id = 4,
.gpio_port = 4,
},
[5] = {
.id = 5,
.gpio_port = MXS_NON_GPIO,
}
};
static struct pinctrl_chip mx28_pinctrl = {
.name = "pinctrl",
.banks = mx28_pin_banks,
.pin2id = mx28_pin2id,
.get_gpio = mx28_get_gpio,
.set_strength = mx28_set_strength,
.set_voltage = mx28_set_voltage,
.set_pullup = mx28_set_pullup,
.set_type = mx28_set_type,
.get_type = mx28_get_type,
};
int __init mx28_pinctrl_init(void)
{
int i;
if (__raw_readl(PINCTRL_BASE_ADDR + HW_PINCTRL_CTRL_CLR) &
BM_PINCTRL_CTRL_SFTRST) {
__raw_writel(BM_PINCTRL_CTRL_SFTRST,
PINCTRL_BASE_ADDR + HW_PINCTRL_CTRL_CLR);
for (i = 0; i < 10000; i++) {
if (!(__raw_readl(PINCTRL_BASE_ADDR + HW_PINCTRL_CTRL) &
BM_PINCTRL_CTRL_SFTRST))
break;
udelay(2);
}
if (i >= 10000)
return -EFAULT;
__raw_writel(BM_PINCTRL_CTRL_CLKGATE,
PINCTRL_BASE_ADDR + HW_PINCTRL_CTRL_CLR);
}
__raw_writel(BM_PINCTRL_CTRL_CLKGATE,
PINCTRL_BASE_ADDR + HW_PINCTRL_CTRL_CLR);
mx28_pinctrl.bank_size = ARRAY_SIZE(mx28_pin_banks);
return mxs_set_pinctrl_chip(&mx28_pinctrl);
}
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