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/device.h>
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <asm/hardware.h>
  30
  31 #include <asm/mach/map.h>
  32
  33 void imx_gpio_mode(int gpio_mode)
  34 {
  35         unsigned int pin = gpio_mode & GPIO_PIN_MASK;
  36         unsigned int port = (gpio_mode & GPIO_PORT_MASK) >> 5;
  37         unsigned int ocr = (gpio_mode & GPIO_OCR_MASK) >> 10;
  38         unsigned int tmp;
  39
  40         /* Pullup enable */
  41         if(gpio_mode & GPIO_PUEN)
  42                 PUEN(port) |= (1<<pin);
  43         else
  44                 PUEN(port) &= ~(1<<pin);
  45
  46         /* Data direction */
  47         if(gpio_mode & GPIO_OUT)
  48                 DDIR(port) |= 1<<pin;
  49         else
  50                 DDIR(port) &= ~(1<<pin);
  51
  52         /* Primary / alternate function */
  53         if(gpio_mode & GPIO_AF)
  54                 GPR(port) |= (1<<pin);
  55         else
  56                 GPR(port) &= ~(1<<pin);
  57
  58         /* use as gpio? */
  59         if( ocr == 3 )
  60                 GIUS(port) |= (1<<pin);
  61         else
  62                 GIUS(port) &= ~(1<<pin);
  63
  64         /* Output / input configuration */
  65         /* FIXME: I'm not very sure about OCR and ICONF, someone
  66          * should have a look over it
  67          */
  68         if(pin<16) {
  69                 tmp = OCR1(port);
  70                 tmp &= ~( 3<<(pin*2));
  71                 tmp |= (ocr << (pin*2));
  72                 OCR1(port) = tmp;
  73
  74                 if( gpio_mode & GPIO_AOUT )
  75                         ICONFA1(port) &= ~( 3<<(pin*2));
  76                 if( gpio_mode & GPIO_BOUT )
  77                         ICONFB1(port) &= ~( 3<<(pin*2));
  78         } else {
  79                 tmp = OCR2(port);
  80                 tmp &= ~( 3<<((pin-16)*2));
  81                 tmp |= (ocr << ((pin-16)*2));
  82                 OCR2(port) = tmp;
  83
  84                 if( gpio_mode & GPIO_AOUT )
  85                         ICONFA2(port) &= ~( 3<<((pin-16)*2));
  86                 if( gpio_mode & GPIO_BOUT )
  87                         ICONFB2(port) &= ~( 3<<((pin-16)*2));
  88         }
  89 }
  90
  91 EXPORT_SYMBOL(imx_gpio_mode);
  92
  93 /*
  94  *  get the system pll clock in Hz
  95  *
  96  *                  mfi + mfn / (mfd +1)
  97  *  f = 2 * f_ref * --------------------
  98  *                        pd + 1
  99  */
 100 static unsigned int imx_decode_pll(unsigned int pll)
 101 {
 102         u32 mfi = (pll >> 10) & 0xf;
 103         u32 mfn = pll & 0x3ff;
 104         u32 mfd = (pll >> 16) & 0x3ff;
 105         u32 pd =  (pll >> 26) & 0xf;
 106         u32 f_ref = (CSCR & CSCR_SYSTEM_SEL) ? 16000000 : (CLK32 * 512);
 107
 108         mfi = mfi <= 5 ? 5 : mfi;
 109
 110         return (2 * (f_ref>>10) * ( (mfi<<10) + (mfn<<10) / (mfd+1) )) / (pd+1);
 111 }
 112
 113 unsigned int imx_get_system_clk(void)
 114 {
 115         return imx_decode_pll(SPCTL0);
 116 }
 117 EXPORT_SYMBOL(imx_get_system_clk);
 118
 119 unsigned int imx_get_mcu_clk(void)
 120 {
 121         return imx_decode_pll(MPCTL0);
 122 }
 123 EXPORT_SYMBOL(imx_get_mcu_clk);
 124
 125 /*
 126  *  get peripheral clock 1 ( UART[12], Timer[12], PWM )
 127  */
 128 unsigned int imx_get_perclk1(void)
 129 {
 130         return imx_get_system_clk() / (((PCDR) & 0xf)+1);
 131 }
 132 EXPORT_SYMBOL(imx_get_perclk1);
 133
 134 /*
 135  *  get peripheral clock 2 ( LCD, SD, SPI[12] )
 136  */
 137 unsigned int imx_get_perclk2(void)
 138 {
 139         return imx_get_system_clk() / (((PCDR>>4) & 0xf)+1);
 140 }
 141 EXPORT_SYMBOL(imx_get_perclk2);
 142
 143 /*
 144  *  get peripheral clock 3 ( SSI )
 145  */
 146 unsigned int imx_get_perclk3(void)
 147 {
 148         return imx_get_system_clk() / (((PCDR>>16) & 0x7f)+1);
 149 }
 150 EXPORT_SYMBOL(imx_get_perclk3);
 151
 152 /*
 153  *  get hclk ( SDRAM, CSI, Memory Stick, I2C, DMA )
 154  */
 155 unsigned int imx_get_hclk(void)
 156 {
 157         return imx_get_system_clk() / (((CSCR>>10) & 0xf)+1);
 158 }
 159 EXPORT_SYMBOL(imx_get_hclk);
 160
 161 static struct resource imx_mmc_resources[] = {
 162         [0] = {
 163                 .start  = 0x00214000,
 164                 .end    = 0x002140FF,
 165                 .flags  = IORESOURCE_MEM,
 166         },
 167         [1] = {
 168                 .start  = (SDHC_INT),
 169                 .end    = (SDHC_INT),
 170                 .flags  = IORESOURCE_IRQ,
 171         },
 172 };
 173
 174 static struct platform_device imx_mmc_device = {
 175         .name           = "imx-mmc",
 176         .id             = 0,
 177         .num_resources  = ARRAY_SIZE(imx_mmc_resources),
 178         .resource       = imx_mmc_resources,
 179 };
 180
 181 static struct resource imx_uart1_resources[] = {
 182         [0] = {
 183                 .start  = 0x00206000,
 184                 .end    = 0x002060FF,
 185                 .flags  = IORESOURCE_MEM,
 186         },
 187         [1] = {
 188                 .start  = (UART1_MINT_RX),
 189                 .end    = (UART1_MINT_RX),
 190                 .flags  = IORESOURCE_IRQ,
 191         },
 192         [2] = {
 193                 .start  = (UART1_MINT_TX),
 194                 .end    = (UART1_MINT_TX),
 195                 .flags  = IORESOURCE_IRQ,
 196         },
 197 };
 198
 199 static struct platform_device imx_uart1_device = {
 200         .name           = "imx-uart",
 201         .id             = 0,
 202         .num_resources  = ARRAY_SIZE(imx_uart1_resources),
 203         .resource       = imx_uart1_resources,
 204 };
 205
 206 static struct resource imx_uart2_resources[] = {
 207         [0] = {
 208                 .start  = 0x00207000,
 209                 .end    = 0x002070FF,
 210                 .flags  = IORESOURCE_MEM,
 211         },
 212         [1] = {
 213                 .start  = (UART2_MINT_RX),
 214                 .end    = (UART2_MINT_RX),
 215                 .flags  = IORESOURCE_IRQ,
 216         },
 217         [2] = {
 218                 .start  = (UART2_MINT_TX),
 219                 .end    = (UART2_MINT_TX),
 220                 .flags  = IORESOURCE_IRQ,
 221         },
 222 };
 223
 224 static struct platform_device imx_uart2_device = {
 225         .name           = "imx-uart",
 226         .id             = 1,
 227         .num_resources  = ARRAY_SIZE(imx_uart2_resources),
 228         .resource       = imx_uart2_resources,
 229 };
 230
 231 static struct resource imxfb_resources[] = {
 232         [0] = {
 233                 .start  = 0x00205000,
 234                 .end    = 0x002050FF,
 235                 .flags  = IORESOURCE_MEM,
 236         },
 237         [1] = {
 238                 .start  = LCDC_INT,
 239                 .end    = LCDC_INT,
 240                 .flags  = IORESOURCE_IRQ,
 241         },
 242 };
 243
 244 static struct platform_device imxfb_device = {
 245         .name           = "imx-fb",
 246         .id             = 0,
 247         .num_resources  = ARRAY_SIZE(imxfb_resources),
 248         .resource       = imxfb_resources,
 249 };
 250
 251 static struct platform_device *devices[] __initdata = {
 252         &imx_mmc_device,
 253         &imxfb_device,
 254         &imx_uart1_device,
 255         &imx_uart2_device,
 256 };
 257
 258 static struct map_desc imx_io_desc[] __initdata = {
 259         /* virtual     physical    length      type */
 260         {IMX_IO_BASE, IMX_IO_PHYS, IMX_IO_SIZE, MT_DEVICE},
 261 };
 262
 263 void __init
 264 imx_map_io(void)
 265 {
 266         iotable_init(imx_io_desc, ARRAY_SIZE(imx_io_desc));
 267 }
 268
 269 static int __init imx_init(void)
 270 {
 271         return platform_add_devices(devices, ARRAY_SIZE(devices));
 272 }
 273
 274 subsys_initcall(imx_init);