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(u32 irq)
  72 {
  73         u32 gpio = irq_to_gpio(irq);
  74         clear_gpio_irqstatus(&mxs_gpio_ports[gpio / 32], gpio & 0x1f);
  75 }
  76
  77 static void mxs_gpio_mask_irq(u32 irq)
  78 {
  79         u32 gpio = irq_to_gpio(irq);
  80         set_gpio_irqenable(&mxs_gpio_ports[gpio / 32], gpio & 0x1f, 0);
  81 }
  82
  83 static void mxs_gpio_unmask_irq(u32 irq)
  84 {
  85         u32 gpio = irq_to_gpio(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(u32 irq, u32 type)
  92 {
  93         u32 gpio = irq_to_gpio(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         irq_stat = __raw_readl(port->base + PINCTRL_IRQSTAT(port->id)) &
 143                         __raw_readl(port->base + PINCTRL_IRQEN(port->id));
 144
 145         while (irq_stat != 0) {
 146                 int irqoffset = fls(irq_stat) - 1;
 147                 generic_handle_irq(gpio_irq_no_base + irqoffset);
 148                 irq_stat &= ~(1 << irqoffset);
 149         }
 150 }
 151
 152 /*
 153  * Set interrupt number "irq" in the GPIO as a wake-up source.
 154  * While system is running, all registered GPIO interrupts need to have
 155  * wake-up enabled. When system is suspended, only selected GPIO interrupts
 156  * need to have wake-up enabled.
 157  * @param  irq          interrupt source number
 158  * @param  enable       enable as wake-up if equal to non-zero
 159  * @return       This function returns 0 on success.
 160  */
 161 static int mxs_gpio_set_wake_irq(u32 irq, u32 enable)
 162 {
 163         u32 gpio = irq_to_gpio(irq);
 164         u32 gpio_idx = gpio & 0x1f;
 165         struct mxs_gpio_port *port = &mxs_gpio_ports[gpio / 32];
 166
 167         if (enable) {
 168                 if (port->irq_high && (gpio_idx >= 16))
 169                         enable_irq_wake(port->irq_high);
 170                 else
 171                         enable_irq_wake(port->irq);
 172         } else {
 173                 if (port->irq_high && (gpio_idx >= 16))
 174                         disable_irq_wake(port->irq_high);
 175                 else
 176                         disable_irq_wake(port->irq);
 177         }
 178
 179         return 0;
 180 }
 181
 182 static struct irq_chip gpio_irq_chip = {
 183         .ack = mxs_gpio_ack_irq,
 184         .mask = mxs_gpio_mask_irq,
 185         .unmask = mxs_gpio_unmask_irq,
 186         .set_type = mxs_gpio_set_irq_type,
 187         .set_wake = mxs_gpio_set_wake_irq,
 188 };
 189
 190 static void mxs_set_gpio_direction(struct gpio_chip *chip, unsigned offset,
 191                                 int dir)
 192 {
 193         struct mxs_gpio_port *port =
 194                 container_of(chip, struct mxs_gpio_port, chip);
 195         void __iomem *pin_addr = port->base + PINCTRL_DOE(port->id);
 196
 197         if (dir)
 198                 __mxs_setl(1 << offset, pin_addr);
 199         else
 200                 __mxs_clrl(1 << offset, pin_addr);
 201 }
 202
 203 static int mxs_gpio_get(struct gpio_chip *chip, unsigned offset)
 204 {
 205         struct mxs_gpio_port *port =
 206                 container_of(chip, struct mxs_gpio_port, chip);
 207
 208         return (__raw_readl(port->base + PINCTRL_DIN(port->id)) >> offset) & 1;
 209 }
 210
 211 static void mxs_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 212 {
 213         struct mxs_gpio_port *port =
 214                 container_of(chip, struct mxs_gpio_port, chip);
 215         void __iomem *pin_addr = port->base + PINCTRL_DOUT(port->id);
 216
 217         if (value)
 218                 __mxs_setl(1 << offset, pin_addr);
 219         else
 220                 __mxs_clrl(1 << offset, pin_addr);
 221 }
 222
 223 static int mxs_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 224 {
 225         struct mxs_gpio_port *port =
 226                 container_of(chip, struct mxs_gpio_port, chip);
 227
 228         return port->virtual_irq_start + offset;
 229 }
 230
 231 static int mxs_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 232 {
 233         mxs_set_gpio_direction(chip, offset, 0);
 234         return 0;
 235 }
 236
 237 static int mxs_gpio_direction_output(struct gpio_chip *chip,
 238                                      unsigned offset, int value)
 239 {
 240         mxs_gpio_set(chip, offset, value);
 241         mxs_set_gpio_direction(chip, offset, 1);
 242         return 0;
 243 }
 244
 245 int __init mxs_gpio_init(struct mxs_gpio_port *port, int cnt)
 246 {
 247         int i, j;
 248
 249         /* save for local usage */
 250         mxs_gpio_ports = port;
 251         gpio_table_size = cnt;
 252
 253         pr_info("MXS GPIO hardware\n");
 254
 255         for (i = 0; i < cnt; i++) {
 256                 /* disable the interrupt and clear the status */
 257                 __raw_writel(0, port[i].base + PINCTRL_PIN2IRQ(i));
 258                 __raw_writel(0, port[i].base + PINCTRL_IRQEN(i));
 259
 260                 /* clear address has to be used to clear IRQSTAT bits */
 261                 __mxs_clrl(~0U, port[i].base + PINCTRL_IRQSTAT(i));
 262
 263                 for (j = port[i].virtual_irq_start;
 264                         j < port[i].virtual_irq_start + 32; j++) {
 265                         set_irq_chip(j, &gpio_irq_chip);
 266                         set_irq_handler(j, handle_level_irq);
 267                         set_irq_flags(j, IRQF_VALID);
 268                 }
 269
 270                 /* setup one handler for each entry */
 271                 set_irq_chained_handler(port[i].irq, mxs_gpio_irq_handler);
 272                 set_irq_data(port[i].irq, &port[i]);
 273
 274                 /* register gpio chip */
 275                 port[i].chip.direction_input = mxs_gpio_direction_input;
 276                 port[i].chip.direction_output = mxs_gpio_direction_output;
 277                 port[i].chip.get = mxs_gpio_get;
 278                 port[i].chip.set = mxs_gpio_set;
 279                 port[i].chip.to_irq = mxs_gpio_to_irq;
 280                 port[i].chip.base = i * 32;
 281                 port[i].chip.ngpio = 32;
 282
 283                 /* its a serious configuration bug when it fails */
 284                 BUG_ON(gpiochip_add(&port[i].chip) < 0);
 285         }
 286
 287         return 0;
 288 }
 289
 290 #define DEFINE_MXS_GPIO_PORT(soc, _id)                                  \
 291         {                                                               \
 292                 .chip.label = "gpio-" #_id,                             \
 293                 .id = _id,                                              \
 294                 .irq = soc ## _INT_GPIO ## _id,                         \
 295                 .base = soc ## _IO_ADDRESS(                             \
 296                                 soc ## _PINCTRL ## _BASE_ADDR),         \
 297                 .virtual_irq_start = MXS_GPIO_IRQ_START + (_id) * 32,   \
 298         }
 299
 300 #define DEFINE_REGISTER_FUNCTION(prefix)                                \
 301 int __init prefix ## _register_gpios(void)                              \
 302 {                                                                       \
 303         return mxs_gpio_init(prefix ## _gpio_ports,                     \
 304                         ARRAY_SIZE(prefix ## _gpio_ports));             \
 305 }
 306
 307 #ifdef CONFIG_SOC_IMX23
 308 static struct mxs_gpio_port mx23_gpio_ports[] = {
 309         DEFINE_MXS_GPIO_PORT(MX23, 0),
 310         DEFINE_MXS_GPIO_PORT(MX23, 1),
 311         DEFINE_MXS_GPIO_PORT(MX23, 2),
 312 };
 313 DEFINE_REGISTER_FUNCTION(mx23)
 314 #endif
 315
 316 #ifdef CONFIG_SOC_IMX28
 317 static struct mxs_gpio_port mx28_gpio_ports[] = {
 318         DEFINE_MXS_GPIO_PORT(MX28, 0),
 319         DEFINE_MXS_GPIO_PORT(MX28, 1),
 320         DEFINE_MXS_GPIO_PORT(MX28, 2),
 321         DEFINE_MXS_GPIO_PORT(MX28, 3),
 322         DEFINE_MXS_GPIO_PORT(MX28, 4),
 323 };
 324 DEFINE_REGISTER_FUNCTION(mx28)
 325 #endif