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 <asm/arch/imxfb.h>
  33 #include <asm/hardware.h>
  34 #include <asm/arch/imx-regs.h>
  35
  36 #include <asm/mach/map.h>
  37 #include <asm/arch/mmc.h>
  38 #include <asm/arch/gpio.h>
  39
  40 unsigned long imx_gpio_alloc_map[(GPIO_PORT_MAX + 1) * 32 / BITS_PER_LONG];
  41
  42 void imx_gpio_mode(int gpio_mode)
  43 {
  44         unsigned int pin = gpio_mode & GPIO_PIN_MASK;
  45         unsigned int port = (gpio_mode & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
  46         unsigned int ocr = (gpio_mode & GPIO_OCR_MASK) >> GPIO_OCR_SHIFT;
  47         unsigned int tmp;
  48
  49         /* Pullup enable */
  50         if(gpio_mode & GPIO_PUEN)
  51                 PUEN(port) |= (1<<pin);
  52         else
  53                 PUEN(port) &= ~(1<<pin);
  54
  55         /* Data direction */
  56         if(gpio_mode & GPIO_OUT)
  57                 DDIR(port) |= 1<<pin;
  58         else
  59                 DDIR(port) &= ~(1<<pin);
  60
  61         /* Primary / alternate function */
  62         if(gpio_mode & GPIO_AF)
  63                 GPR(port) |= (1<<pin);
  64         else
  65                 GPR(port) &= ~(1<<pin);
  66
  67         /* use as gpio? */
  68         if(gpio_mode &  GPIO_GIUS)
  69                 GIUS(port) |= (1<<pin);
  70         else
  71                 GIUS(port) &= ~(1<<pin);
  72
  73         /* Output / input configuration */
  74         /* FIXME: I'm not very sure about OCR and ICONF, someone
  75          * should have a look over it
  76          */
  77         if(pin<16) {
  78                 tmp = OCR1(port);
  79                 tmp &= ~( 3<<(pin*2));
  80                 tmp |= (ocr << (pin*2));
  81                 OCR1(port) = tmp;
  82
  83                 ICONFA1(port) &= ~( 3<<(pin*2));
  84                 ICONFA1(port) |= ((gpio_mode >> GPIO_AOUT_SHIFT) & 3) << (pin * 2);
  85                 ICONFB1(port) &= ~( 3<<(pin*2));
  86                 ICONFB1(port) |= ((gpio_mode >> GPIO_BOUT_SHIFT) & 3) << (pin * 2);
  87         } else {
  88                 tmp = OCR2(port);
  89                 tmp &= ~( 3<<((pin-16)*2));
  90                 tmp |= (ocr << ((pin-16)*2));
  91                 OCR2(port) = tmp;
  92
  93                 ICONFA2(port) &= ~( 3<<((pin-16)*2));
  94                 ICONFA2(port) |= ((gpio_mode >> GPIO_AOUT_SHIFT) & 3) << ((pin-16) * 2);
  95                 ICONFB2(port) &= ~( 3<<((pin-16)*2));
  96                 ICONFB2(port) |= ((gpio_mode >> GPIO_BOUT_SHIFT) & 3) << ((pin-16) * 2);
  97         }
  98 }
  99
 100 EXPORT_SYMBOL(imx_gpio_mode);
 101
 102 int imx_gpio_request(unsigned gpio, const char *label)
 103 {
 104         if(gpio >= (GPIO_PORT_MAX + 1) * 32) {
 105                 printk(KERN_ERR "imx_gpio: Attempt to request nonexistent GPIO %d for \"%s\"\n",
 106                         gpio, label ? label : "?");
 107                 return -EINVAL;
 108         }
 109
 110         if(test_and_set_bit(gpio, imx_gpio_alloc_map)) {
 111                 printk(KERN_ERR "imx_gpio: GPIO %d already used. Allocation for \"%s\" failed\n",
 112                         gpio, label ? label : "?");
 113                 return -EBUSY;
 114         }
 115
 116         return 0;
 117 }
 118
 119 EXPORT_SYMBOL(imx_gpio_request);
 120
 121 void imx_gpio_free(unsigned gpio)
 122 {
 123         if(gpio >= (GPIO_PORT_MAX + 1) * 32)
 124                 return;
 125
 126         clear_bit(gpio, imx_gpio_alloc_map);
 127 }
 128
 129 EXPORT_SYMBOL(imx_gpio_free);
 130
 131 int imx_gpio_direction_input(unsigned gpio)
 132 {
 133         imx_gpio_mode(gpio | GPIO_IN | GPIO_GIUS | GPIO_DR);
 134         return 0;
 135 }
 136
 137 EXPORT_SYMBOL(imx_gpio_direction_input);
 138
 139 int imx_gpio_direction_output(unsigned gpio, int value)
 140 {
 141         imx_gpio_set_value(gpio, value);
 142         imx_gpio_mode(gpio | GPIO_OUT | GPIO_GIUS | GPIO_DR);
 143         return 0;
 144 }
 145
 146 EXPORT_SYMBOL(imx_gpio_direction_output);
 147
 148 int imx_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
 149                                 int alloc_mode, const char *label)
 150 {
 151         const int *p = pin_list;
 152         int i;
 153         unsigned gpio;
 154         unsigned mode;
 155
 156         for (i = 0; i < count; i++) {
 157                 gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
 158                 mode = *p & ~(GPIO_PIN_MASK | GPIO_PORT_MASK);
 159
 160                 if (gpio >= (GPIO_PORT_MAX + 1) * 32)
 161                         goto setup_error;
 162
 163                 if (alloc_mode & IMX_GPIO_ALLOC_MODE_RELEASE)
 164                         imx_gpio_free(gpio);
 165                 else if (!(alloc_mode & IMX_GPIO_ALLOC_MODE_NO_ALLOC))
 166                         if (imx_gpio_request(gpio, label))
 167                                 if (!(alloc_mode & IMX_GPIO_ALLOC_MODE_TRY_ALLOC))
 168                                         goto setup_error;
 169
 170                 if (!(alloc_mode & (IMX_GPIO_ALLOC_MODE_ALLOC_ONLY |
 171                                     IMX_GPIO_ALLOC_MODE_RELEASE)))
 172                         imx_gpio_mode(gpio | mode);
 173
 174                 p++;
 175         }
 176         return 0;
 177
 178 setup_error:
 179         if(alloc_mode & (IMX_GPIO_ALLOC_MODE_NO_ALLOC |
 180                          IMX_GPIO_ALLOC_MODE_TRY_ALLOC))
 181                 return -EINVAL;
 182
 183         while (p != pin_list) {
 184                 p--;
 185                 gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
 186                 imx_gpio_free(gpio);
 187         }
 188
 189         return -EINVAL;
 190 }
 191
 192 EXPORT_SYMBOL(imx_gpio_setup_multiple_pins);
 193
 194 void __imx_gpio_set_value(unsigned gpio, int value)
 195 {
 196         imx_gpio_set_value_inline(gpio, value);
 197 }
 198
 199 EXPORT_SYMBOL(__imx_gpio_set_value);
 200
 201 int imx_gpio_to_irq(unsigned gpio)
 202 {
 203         return IRQ_GPIOA(0) + gpio;
 204 }
 205
 206 EXPORT_SYMBOL(imx_gpio_to_irq);
 207
 208 int imx_irq_to_gpio(unsigned irq)
 209 {
 210         if (irq < IRQ_GPIOA(0))
 211                 return -EINVAL;
 212         return irq - IRQ_GPIOA(0);
 213 }
 214
 215 EXPORT_SYMBOL(imx_irq_to_gpio);
 216
 217 /*
 218  *  get the system pll clock in Hz
 219  *
 220  *                  mfi + mfn / (mfd +1)
 221  *  f = 2 * f_ref * --------------------
 222  *                        pd + 1
 223  */
 224 static unsigned int imx_decode_pll(unsigned int pll, u32 f_ref)
 225 {
 226         unsigned long long ll;
 227         unsigned long quot;
 228
 229         u32 mfi = (pll >> 10) & 0xf;
 230         u32 mfn = pll & 0x3ff;
 231         u32 mfd = (pll >> 16) & 0x3ff;
 232         u32 pd =  (pll >> 26) & 0xf;
 233
 234         mfi = mfi <= 5 ? 5 : mfi;
 235
 236         ll = 2 * (unsigned long long)f_ref * ( (mfi<<16) + (mfn<<16) / (mfd+1) );
 237         quot = (pd+1) * (1<<16);
 238         ll += quot / 2;
 239         do_div(ll, quot);
 240         return (unsigned int) ll;
 241 }
 242
 243 unsigned int imx_get_system_clk(void)
 244 {
 245         u32 f_ref = (CSCR & CSCR_SYSTEM_SEL) ? 16000000 : (CLK32 * 512);
 246
 247         return imx_decode_pll(SPCTL0, f_ref);
 248 }
 249 EXPORT_SYMBOL(imx_get_system_clk);
 250
 251 unsigned int imx_get_mcu_clk(void)
 252 {
 253         return imx_decode_pll(MPCTL0, CLK32 * 512);
 254 }
 255 EXPORT_SYMBOL(imx_get_mcu_clk);
 256
 257 /*
 258  *  get peripheral clock 1 ( UART[12], Timer[12], PWM )
 259  */
 260 unsigned int imx_get_perclk1(void)
 261 {
 262         return imx_get_system_clk() / (((PCDR) & 0xf)+1);
 263 }
 264 EXPORT_SYMBOL(imx_get_perclk1);
 265
 266 /*
 267  *  get peripheral clock 2 ( LCD, SD, SPI[12] )
 268  */
 269 unsigned int imx_get_perclk2(void)
 270 {
 271         return imx_get_system_clk() / (((PCDR>>4) & 0xf)+1);
 272 }
 273 EXPORT_SYMBOL(imx_get_perclk2);
 274
 275 /*
 276  *  get peripheral clock 3 ( SSI )
 277  */
 278 unsigned int imx_get_perclk3(void)
 279 {
 280         return imx_get_system_clk() / (((PCDR>>16) & 0x7f)+1);
 281 }
 282 EXPORT_SYMBOL(imx_get_perclk3);
 283
 284 /*
 285  *  get hclk ( SDRAM, CSI, Memory Stick, I2C, DMA )
 286  */
 287 unsigned int imx_get_hclk(void)
 288 {
 289         return imx_get_system_clk() / (((CSCR>>10) & 0xf)+1);
 290 }
 291 EXPORT_SYMBOL(imx_get_hclk);
 292
 293 static struct resource imx_mmc_resources[] = {
 294         [0] = {
 295                 .start  = 0x00214000,
 296                 .end    = 0x002140FF,
 297                 .flags  = IORESOURCE_MEM,
 298         },
 299         [1] = {
 300                 .start  = (SDHC_INT),
 301                 .end    = (SDHC_INT),
 302                 .flags  = IORESOURCE_IRQ,
 303         },
 304 };
 305
 306 static u64 imxmmmc_dmamask = 0xffffffffUL;
 307
 308 static struct platform_device imx_mmc_device = {
 309         .name           = "imx-mmc",
 310         .id             = 0,
 311         .dev            = {
 312                 .dma_mask = &imxmmmc_dmamask,
 313                 .coherent_dma_mask = 0xffffffff,
 314         },
 315         .num_resources  = ARRAY_SIZE(imx_mmc_resources),
 316         .resource       = imx_mmc_resources,
 317 };
 318
 319 void __init imx_set_mmc_info(struct imxmmc_platform_data *info)
 320 {
 321         imx_mmc_device.dev.platform_data = info;
 322 }
 323
 324 static struct imxfb_mach_info imx_fb_info;
 325
 326 void __init set_imx_fb_info(struct imxfb_mach_info *hard_imx_fb_info)
 327 {
 328         memcpy(&imx_fb_info,hard_imx_fb_info,sizeof(struct imxfb_mach_info));
 329 }
 330 EXPORT_SYMBOL(set_imx_fb_info);
 331
 332 static struct resource imxfb_resources[] = {
 333         [0] = {
 334                 .start  = 0x00205000,
 335                 .end    = 0x002050FF,
 336                 .flags  = IORESOURCE_MEM,
 337         },
 338         [1] = {
 339                 .start  = LCDC_INT,
 340                 .end    = LCDC_INT,
 341                 .flags  = IORESOURCE_IRQ,
 342         },
 343 };
 344
 345 static u64 fb_dma_mask = ~(u64)0;
 346
 347 static struct platform_device imxfb_device = {
 348         .name           = "imx-fb",
 349         .id             = 0,
 350         .dev            = {
 351                 .platform_data  = &imx_fb_info,
 352                 .dma_mask       = &fb_dma_mask,
 353                 .coherent_dma_mask = 0xffffffff,
 354         },
 355         .num_resources  = ARRAY_SIZE(imxfb_resources),
 356         .resource       = imxfb_resources,
 357 };
 358
 359 static struct platform_device *devices[] __initdata = {
 360         &imx_mmc_device,
 361         &imxfb_device,
 362 };
 363
 364 static struct map_desc imx_io_desc[] __initdata = {
 365         {
 366                 .virtual        = IMX_IO_BASE,
 367                 .pfn            = __phys_to_pfn(IMX_IO_PHYS),
 368                 .length         = IMX_IO_SIZE,
 369                 .type           = MT_DEVICE
 370         }
 371 };
 372
 373 void __init
 374 imx_map_io(void)
 375 {
 376         iotable_init(imx_io_desc, ARRAY_SIZE(imx_io_desc));
 377 }
 378
 379 static int __init imx_init(void)
 380 {
 381         return platform_add_devices(devices, ARRAY_SIZE(devices));
 382 }
 383
 384 subsys_initcall(imx_init);