diff options
Diffstat (limited to 'arch/arm/mach-mx28/pinctrl.c')
| -rw-r--r-- | arch/arm/mach-mx28/pinctrl.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/arch/arm/mach-mx28/pinctrl.c b/arch/arm/mach-mx28/pinctrl.c new file mode 100644 index 000000000000..296f4036395d --- /dev/null +++ b/arch/arm/mach-mx28/pinctrl.c @@ -0,0 +1,175 @@ +/* + * 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); +} |