arch/arm/mach-imx/generic.c

   1 /*
   2  *  arch/arm/mach-imx/generic.c
   3  *
   4  *  author: Sascha Hauer
   5  *  Created: april 20th, 2004
   6  *  Copyright: Synertronixx GmbH
   7  *
   8  *  Common code for i.MX machines
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  *
  24  */
  25 #include <linux/platform_device.h>
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/string.h>
  30
  31 #include <asm/errno.h>
  32 #include <mach/hardware.h>
  33 #include <mach/imx-regs.h>
  34
  35 #include <asm/mach/map.h>
  36 #include <mach/mmc.h>
  37 #include <mach/gpio.h>
  38
  39 unsigned long imx_gpio_alloc_map[(GPIO_PORT_MAX + 1) * 32 / BITS_PER_LONG];
  40
  41 void imx_gpio_mode(int gpio_mode)
  42 {
  43         unsigned int pin = gpio_mode & GPIO_PIN_MASK;
  44         unsigned int port = (gpio_mode & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
  45         unsigned int ocr = (gpio_mode & GPIO_OCR_MASK) >> GPIO_OCR_SHIFT;
  46         unsigned int tmp;
  47
  48         /* Pullup enable */
  49         if(gpio_mode & GPIO_PUEN)
  50                 PUEN(port) |= (1<<pin);
  51         else
  52                 PUEN(port) &= ~(1<<pin);
  53
  54         /* Data direction */
  55         if(gpio_mode & GPIO_OUT)
  56                 DDIR(port) |= 1<<pin;
  57         else
  58                 DDIR(port) &= ~(1<<pin);
  59
  60         /* Primary / alternate function */
  61         if(gpio_mode & GPIO_AF)
  62                 GPR(port) |= (1<<pin);
  63         else
  64                 GPR(port) &= ~(1<<pin);
  65
  66         /* use as gpio? */
  67         if(gpio_mode &  GPIO_GIUS)
  68                 GIUS(port) |= (1<<pin);
  69         else
  70                 GIUS(port) &= ~(1<<pin);
  71
  72         /* Output / input configuration */
  73         /* FIXME: I'm not very sure about OCR and ICONF, someone
  74          * should have a look over it
  75          */
  76         if(pin<16) {
  77                 tmp = OCR1(port);
  78                 tmp &= ~( 3<<(pin*2));
  79                 tmp |= (ocr << (pin*2));
  80                 OCR1(port) = tmp;
  81
  82                 ICONFA1(port) &= ~( 3<<(pin*2));
  83                 ICONFA1(port) |= ((gpio_mode >> GPIO_AOUT_SHIFT) & 3) << (pin * 2);
  84                 ICONFB1(port) &= ~( 3<<(pin*2));
  85                 ICONFB1(port) |= ((gpio_mode >> GPIO_BOUT_SHIFT) & 3) << (pin * 2);
  86         } else {
  87                 tmp = OCR2(port);
  88                 tmp &= ~( 3<<((pin-16)*2));
  89                 tmp |= (ocr << ((pin-16)*2));
  90                 OCR2(port) = tmp;
  91
  92                 ICONFA2(port) &= ~( 3<<((pin-16)*2));
  93                 ICONFA2(port) |= ((gpio_mode >> GPIO_AOUT_SHIFT) & 3) << ((pin-16) * 2);
  94                 ICONFB2(port) &= ~( 3<<((pin-16)*2));
  95                 ICONFB2(port) |= ((gpio_mode >> GPIO_BOUT_SHIFT) & 3) << ((pin-16) * 2);
  96         }
  97 }
  98
  99 EXPORT_SYMBOL(imx_gpio_mode);
 100
 101 int imx_gpio_request(unsigned gpio, const char *label)
 102 {
 103         if(gpio >= (GPIO_PORT_MAX + 1) * 32) {
 104                 printk(KERN_ERR "imx_gpio: Attempt to request nonexistent GPIO %d for \"%s\"\n",
 105                         gpio, label ? label : "?");
 106                 return -EINVAL;
 107         }
 108
 109         if(test_and_set_bit(gpio, imx_gpio_alloc_map)) {
 110                 printk(KERN_ERR "imx_gpio: GPIO %d already used. Allocation for \"%s\" failed\n",
 111                         gpio, label ? label : "?");
 112                 return -EBUSY;
 113         }
 114
 115         return 0;
 116 }
 117
 118 EXPORT_SYMBOL(imx_gpio_request);
 119
 120 void imx_gpio_free(unsigned gpio)
 121 {
 122         if(gpio >= (GPIO_PORT_MAX + 1) * 32)
 123                 return;
 124
 125         clear_bit(gpio, imx_gpio_alloc_map);
 126 }
 127
 128 EXPORT_SYMBOL(imx_gpio_free);
 129
 130 int imx_gpio_direction_input(unsigned gpio)
 131 {
 132         imx_gpio_mode(gpio | GPIO_IN | GPIO_GIUS | GPIO_DR);
 133         return 0;
 134 }
 135
 136 EXPORT_SYMBOL(imx_gpio_direction_input);
 137
 138 int imx_gpio_direction_output(unsigned gpio, int value)
 139 {
 140         imx_gpio_set_value(gpio, value);
 141         imx_gpio_mode(gpio | GPIO_OUT | GPIO_GIUS | GPIO_DR);
 142         return 0;
 143 }
 144
 145 EXPORT_SYMBOL(imx_gpio_direction_output);
 146
 147 int imx_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
 148                                 int alloc_mode, const char *label)
 149 {
 150         const int *p = pin_list;
 151         int i;
 152         unsigned gpio;
 153         unsigned mode;
 154
 155         for (i = 0; i < count; i++) {
 156                 gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
 157                 mode = *p & ~(GPIO_PIN_MASK | GPIO_PORT_MASK);
 158
 159                 if (gpio >= (GPIO_PORT_MAX + 1) * 32)
 160                         goto setup_error;
 161
 162                 if (alloc_mode & IMX_GPIO_ALLOC_MODE_RELEASE)
 163                         imx_gpio_free(gpio);
 164                 else if (!(alloc_mode & IMX_GPIO_ALLOC_MODE_NO_ALLOC))
 165                         if (imx_gpio_request(gpio, label))
 166                                 if (!(alloc_mode & IMX_GPIO_ALLOC_MODE_TRY_ALLOC))
 167                                         goto setup_error;
 168
 169                 if (!(alloc_mode & (IMX_GPIO_ALLOC_MODE_ALLOC_ONLY |
 170                                     IMX_GPIO_ALLOC_MODE_RELEASE)))
 171                         imx_gpio_mode(gpio | mode);
 172
 173                 p++;
 174         }
 175         return 0;
 176
 177 setup_error:
 178         if(alloc_mode & (IMX_GPIO_ALLOC_MODE_NO_ALLOC |
 179                          IMX_GPIO_ALLOC_MODE_TRY_ALLOC))
 180                 return -EINVAL;
 181
 182         while (p != pin_list) {
 183                 p--;
 184                 gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
 185                 imx_gpio_free(gpio);
 186         }
 187
 188         return -EINVAL;
 189 }
 190
 191 EXPORT_SYMBOL(imx_gpio_setup_multiple_pins);
 192
 193 void __imx_gpio_set_value(unsigned gpio, int value)
 194 {
 195         imx_gpio_set_value_inline(gpio, value);
 196 }
 197
 198 EXPORT_SYMBOL(__imx_gpio_set_value);
 199
 200 int imx_gpio_to_irq(unsigned gpio)
 201 {
 202         return IRQ_GPIOA(0) + gpio;
 203 }
 204
 205 EXPORT_SYMBOL(imx_gpio_to_irq);
 206
 207 int imx_irq_to_gpio(unsigned irq)
 208 {
 209         if (irq < IRQ_GPIOA(0))
 210                 return -EINVAL;
 211         return irq - IRQ_GPIOA(0);
 212 }
 213
 214 EXPORT_SYMBOL(imx_irq_to_gpio);
 215
 216 static struct resource imx_mmc_resources[] = {
 217         [0] = {
 218                 .start  = 0x00214000,
 219                 .end    = 0x002140FF,
 220                 .flags  = IORESOURCE_MEM,
 221         },
 222         [1] = {
 223                 .start  = (SDHC_INT),
 224                 .end    = (SDHC_INT),
 225                 .flags  = IORESOURCE_IRQ,
 226         },
 227 };
 228
 229 static u64 imxmmmc_dmamask = 0xffffffffUL;
 230
 231 static struct platform_device imx_mmc_device = {
 232         .name           = "imx-mmc",
 233         .id             = 0,
 234         .dev            = {
 235                 .dma_mask = &imxmmmc_dmamask,
 236                 .coherent_dma_mask = 0xffffffff,
 237         },
 238         .num_resources  = ARRAY_SIZE(imx_mmc_resources),
 239         .resource       = imx_mmc_resources,
 240 };
 241
 242 void __init imx_set_mmc_info(struct imxmmc_platform_data *info)
 243 {
 244         imx_mmc_device.dev.platform_data = info;
 245 }
 246
 247 static struct platform_device *devices[] __initdata = {
 248         &imx_mmc_device,
 249 };
 250
 251 static struct map_desc imx_io_desc[] __initdata = {
 252         {
 253                 .virtual        = IMX_IO_BASE,
 254                 .pfn            = __phys_to_pfn(IMX_IO_PHYS),
 255                 .length         = IMX_IO_SIZE,
 256                 .type           = MT_DEVICE
 257         }
 258 };
 259
 260 void __init
 261 imx_map_io(void)
 262 {
 263         iotable_init(imx_io_desc, ARRAY_SIZE(imx_io_desc));
 264 }
 265
 266 static int __init imx_init(void)
 267 {
 268         return platform_add_devices(devices, ARRAY_SIZE(devices));
 269 }
 270
 271 subsys_initcall(imx_init);