arch/arm/mach-mxs/gpio.c

   1 /*
   2  * MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de>
   3  * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
   4  *
   5  * Based on code from Freescale,
   6  * Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * as published by the Free Software Foundation; either version 2
  11  * of the License, or (at your option) any later version.
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  20  * MA  02110-1301, USA.
  21  */
  22
  23 #include <linux/init.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/io.h>
  26 #include <linux/irq.h>
  27 #include <linux/gpio.h>
  28 #include <mach/mx23.h>
  29 #include <mach/mx28.h>
  30 #include <asm-generic/bug.h>
  31
  32 #include "gpio.h"
  33
  34 static struct mxs_gpio_port *mxs_gpio_ports;
  35 static int gpio_table_size;
  36
  37 #define PINCTRL_DOUT(n)         ((cpu_is_mx23() ? 0x0500 : 0x0700) + (n) * 0x10)
  38 #define PINCTRL_DIN(n)          ((cpu_is_mx23() ? 0x0600 : 0x0900) + (n) * 0x10)
  39 #define PINCTRL_DOE(n)          ((cpu_is_mx23() ? 0x0700 : 0x0b00) + (n) * 0x10)
  40 #define PINCTRL_PIN2IRQ(n)      ((cpu_is_mx23() ? 0x0800 : 0x1000) + (n) * 0x10)
  41 #define PINCTRL_IRQEN(n)        ((cpu_is_mx23() ? 0x0900 : 0x1100) + (n) * 0x10)
  42 #define PINCTRL_IRQLEV(n)       ((cpu_is_mx23() ? 0x0a00 : 0x1200) + (n) * 0x10)
  43 #define PINCTRL_IRQPOL(n)       ((cpu_is_mx23() ? 0x0b00 : 0x1300) + (n) * 0x10)
  44 #define PINCTRL_IRQSTAT(n)      ((cpu_is_mx23() ? 0x0c00 : 0x1400) + (n) * 0x10)
  45
  46 #define GPIO_INT_FALL_EDGE      0x0
  47 #define GPIO_INT_LOW_LEV        0x1
  48 #define GPIO_INT_RISE_EDGE      0x2
  49 #define GPIO_INT_HIGH_LEV       0x3
  50 #define GPIO_INT_LEV_MASK       (1 << 0)
  51 #define GPIO_INT_POL_MASK       (1 << 1)
  52
  53 /* Note: This driver assumes 32 GPIOs are handled in one register */
  54
  55 static void clear_gpio_irqstatus(struct mxs_gpio_port *port, u32 index)
  56 {
  57         __mxs_clrl(1 << index, port->base + PINCTRL_IRQSTAT(port->id));
  58 }
  59
  60 static void set_gpio_irqenable(struct mxs_gpio_port *port, u32 index,
  61                                 int enable)
  62 {
  63         if (enable) {
  64                 __mxs_setl(1 << index, port->base + PINCTRL_IRQEN(port->id));
  65                 __mxs_setl(1 << index, port->base + PINCTRL_PIN2IRQ(port->id));
  66         } else {
  67                 __mxs_clrl(1 << index, port->base + PINCTRL_IRQEN(port->id));
  68         }
  69 }
  70
  71 static void mxs_gpio_ack_irq(struct irq_data *d)
  72 {
  73         u32 gpio = irq_to_gpio(d->irq);
  74         clear_gpio_irqstatus(&mxs_gpio_ports[gpio / 32], gpio & 0x1f);
  75 }
  76
  77 static void mxs_gpio_mask_irq(struct irq_data *d)
  78 {
  79         u32 gpio = irq_to_gpio(d->irq);
  80         set_gpio_irqenable(&mxs_gpio_ports[gpio / 32], gpio & 0x1f, 0);
  81 }
  82
  83 static void mxs_gpio_unmask_irq(struct irq_data *d)
  84 {
  85         u32 gpio = irq_to_gpio(d->irq);
  86         set_gpio_irqenable(&mxs_gpio_ports[gpio / 32], gpio & 0x1f, 1);
  87 }
  88
  89 static int mxs_gpio_get(struct gpio_chip *chip, unsigned offset);
  90
  91 static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
  92 {
  93         u32 gpio = irq_to_gpio(d->irq);
  94         u32 pin_mask = 1 << (gpio & 31);
  95         struct mxs_gpio_port *port = &mxs_gpio_ports[gpio / 32];
  96         void __iomem *pin_addr;
  97         int edge;
  98
  99         switch (type) {
 100         case IRQ_TYPE_EDGE_RISING:
 101                 edge = GPIO_INT_RISE_EDGE;
 102                 break;
 103         case IRQ_TYPE_EDGE_FALLING:
 104                 edge = GPIO_INT_FALL_EDGE;
 105                 break;
 106         case IRQ_TYPE_LEVEL_LOW:
 107                 edge = GPIO_INT_LOW_LEV;
 108                 break;
 109         case IRQ_TYPE_LEVEL_HIGH:
 110                 edge = GPIO_INT_HIGH_LEV;
 111                 break;
 112         default:
 113                 return -EINVAL;
 114         }
 115
 116         /* set level or edge */
 117         pin_addr = port->base + PINCTRL_IRQLEV(port->id);
 118         if (edge & GPIO_INT_LEV_MASK)
 119                 __mxs_setl(pin_mask, pin_addr);
 120         else
 121                 __mxs_clrl(pin_mask, pin_addr);
 122
 123         /* set polarity */
 124         pin_addr = port->base + PINCTRL_IRQPOL(port->id);
 125         if (edge & GPIO_INT_POL_MASK)
 126                 __mxs_setl(pin_mask, pin_addr);
 127         else
 128                 __mxs_clrl(pin_mask, pin_addr);
 129
 130         clear_gpio_irqstatus(port, gpio & 0x1f);
 131
 132         return 0;
 133 }
 134
 135 /* MXS has one interrupt *per* gpio port */
 136 static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc)
 137 {
 138         u32 irq_stat;
 139         struct mxs_gpio_port *port = (struct mxs_gpio_port *)get_irq_data(irq);
 140         u32 gpio_irq_no_base = port->virtual_irq_start;
 141
 142         desc->irq_data.chip->irq_ack(&desc->irq_data);
 143
 144         irq_stat = __raw_readl(port->base + PINCTRL_IRQSTAT(port->id)) &
 145                         __raw_readl(port->base + PINCTRL_IRQEN(port->id));
 146
 147         while (irq_stat != 0) {
 148                 int irqoffset = fls(irq_stat) - 1;
 149                 generic_handle_irq(gpio_irq_no_base + irqoffset);
 150                 irq_stat &= ~(1 << irqoffset);
 151         }
 152 }
 153
 154 /*
 155  * Set interrupt number "irq" in the GPIO as a wake-up source.
 156  * While system is running, all registered GPIO interrupts need to have
 157  * wake-up enabled. When system is suspended, only selected GPIO interrupts
 158  * need to have wake-up enabled.
 159  * @param  irq          interrupt source number
 160  * @param  enable       enable as wake-up if equal to non-zero
 161  * @return       This function returns 0 on success.
 162  */
 163 static int mxs_gpio_set_wake_irq(struct irq_data *d, unsigned int enable)
 164 {
 165         u32 gpio = irq_to_gpio(d->irq);
 166         u32 gpio_idx = gpio & 0x1f;
 167         struct mxs_gpio_port *port = &mxs_gpio_ports[gpio / 32];
 168
 169         if (enable) {
 170                 if (port->irq_high && (gpio_idx >= 16))
 171                         enable_irq_wake(port->irq_high);
 172                 else
 173                         enable_irq_wake(port->irq);
 174         } else {
 175                 if (port->irq_high && (gpio_idx >= 16))
 176                         disable_irq_wake(port->irq_high);
 177                 else
 178                         disable_irq_wake(port->irq);
 179         }
 180
 181         return 0;
 182 }
 183
 184 static struct irq_chip gpio_irq_chip = {
 185         .irq_ack = mxs_gpio_ack_irq,
 186         .irq_mask = mxs_gpio_mask_irq,
 187         .irq_unmask = mxs_gpio_unmask_irq,
 188         .irq_set_type = mxs_gpio_set_irq_type,
 189         .irq_set_wake = mxs_gpio_set_wake_irq,
 190 };
 191
 192 static void mxs_set_gpio_direction(struct gpio_chip *chip, unsigned offset,
 193                                 int dir)
 194 {
 195         struct mxs_gpio_port *port =
 196                 container_of(chip, struct mxs_gpio_port, chip);
 197         void __iomem *pin_addr = port->base + PINCTRL_DOE(port->id);
 198
 199         if (dir)
 200                 __mxs_setl(1 << offset, pin_addr);
 201         else
 202                 __mxs_clrl(1 << offset, pin_addr);
 203 }
 204
 205 static int mxs_gpio_get(struct gpio_chip *chip, unsigned offset)
 206 {
 207         struct mxs_gpio_port *port =
 208                 container_of(chip, struct mxs_gpio_port, chip);
 209
 210         return (__raw_readl(port->base + PINCTRL_DIN(port->id)) >> offset) & 1;
 211 }
 212
 213 static void mxs_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 214 {
 215         struct mxs_gpio_port *port =
 216                 container_of(chip, struct mxs_gpio_port, chip);
 217         void __iomem *pin_addr = port->base + PINCTRL_DOUT(port->id);
 218
 219         if (value)
 220                 __mxs_setl(1 << offset, pin_addr);
 221         else
 222                 __mxs_clrl(1 << offset, pin_addr);
 223 }
 224
 225 static int mxs_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 226 {
 227         struct mxs_gpio_port *port =
 228                 container_of(chip, struct mxs_gpio_port, chip);
 229
 230         return port->virtual_irq_start + offset;
 231 }
 232
 233 static int mxs_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 234 {
 235         mxs_set_gpio_direction(chip, offset, 0);
 236         return 0;
 237 }
 238
 239 static int mxs_gpio_direction_output(struct gpio_chip *chip,
 240                                      unsigned offset, int value)
 241 {
 242         mxs_gpio_set(chip, offset, value);
 243         mxs_set_gpio_direction(chip, offset, 1);
 244         return 0;
 245 }
 246
 247 int __init mxs_gpio_init(struct mxs_gpio_port *port, int cnt)
 248 {
 249         int i, j;
 250
 251         /* save for local usage */
 252         mxs_gpio_ports = port;
 253         gpio_table_size = cnt;
 254
 255         pr_info("MXS GPIO hardware\n");
 256
 257         for (i = 0; i < cnt; i++) {
 258                 /* disable the interrupt and clear the status */
 259                 __raw_writel(0, port[i].base + PINCTRL_PIN2IRQ(i));
 260                 __raw_writel(0, port[i].base + PINCTRL_IRQEN(i));
 261
 262                 /* clear address has to be used to clear IRQSTAT bits */
 263                 __mxs_clrl(~0U, port[i].base + PINCTRL_IRQSTAT(i));
 264
 265                 for (j = port[i].virtual_irq_start;
 266                         j < port[i].virtual_irq_start + 32; j++) {
 267                         set_irq_chip(j, &gpio_irq_chip);
 268                         set_irq_handler(j, handle_level_irq);
 269                         set_irq_flags(j, IRQF_VALID);
 270                 }
 271
 272                 /* setup one handler for each entry */
 273                 set_irq_chained_handler(port[i].irq, mxs_gpio_irq_handler);
 274                 set_irq_data(port[i].irq, &port[i]);
 275
 276                 /* register gpio chip */
 277                 port[i].chip.direction_input = mxs_gpio_direction_input;
 278                 port[i].chip.direction_output = mxs_gpio_direction_output;
 279                 port[i].chip.get = mxs_gpio_get;
 280                 port[i].chip.set = mxs_gpio_set;
 281                 port[i].chip.to_irq = mxs_gpio_to_irq;
 282                 port[i].chip.base = i * 32;
 283                 port[i].chip.ngpio = 32;
 284
 285                 /* its a serious configuration bug when it fails */
 286                 BUG_ON(gpiochip_add(&port[i].chip) < 0);
 287         }
 288
 289         return 0;
 290 }
 291
 292 #define DEFINE_MXS_GPIO_PORT(soc, _id)                                  \
 293         {                                                               \
 294                 .chip.label = "gpio-" #_id,                             \
 295                 .id = _id,                                              \
 296                 .irq = soc ## _INT_GPIO ## _id,                         \
 297                 .base = soc ## _IO_ADDRESS(                             \
 298                                 soc ## _PINCTRL ## _BASE_ADDR),         \
 299                 .virtual_irq_start = MXS_GPIO_IRQ_START + (_id) * 32,   \
 300         }
 301
 302 #define DEFINE_REGISTER_FUNCTION(prefix)                                \
 303 int __init prefix ## _register_gpios(void)                              \
 304 {                                                                       \
 305         return mxs_gpio_init(prefix ## _gpio_ports,                     \
 306                         ARRAY_SIZE(prefix ## _gpio_ports));             \
 307 }
 308
 309 #ifdef CONFIG_SOC_IMX23
 310 static struct mxs_gpio_port mx23_gpio_ports[] = {
 311         DEFINE_MXS_GPIO_PORT(MX23, 0),
 312         DEFINE_MXS_GPIO_PORT(MX23, 1),
 313         DEFINE_MXS_GPIO_PORT(MX23, 2),
 314 };
 315 DEFINE_REGISTER_FUNCTION(mx23)
 316 #endif
 317
 318 #ifdef CONFIG_SOC_IMX28
 319 static struct mxs_gpio_port mx28_gpio_ports[] = {
 320         DEFINE_MXS_GPIO_PORT(MX28, 0),
 321         DEFINE_MXS_GPIO_PORT(MX28, 1),
 322         DEFINE_MXS_GPIO_PORT(MX28, 2),
 323         DEFINE_MXS_GPIO_PORT(MX28, 3),
 324         DEFINE_MXS_GPIO_PORT(MX28, 4),
 325 };
 326 DEFINE_REGISTER_FUNCTION(mx28)
 327 #endif