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   1 /*
   2  * arch/arm/mach-ixp4xx/common.c
   3  *
   4  * Generic code shared across all IXP4XX platforms
   5  *
   6  * Maintainer: Deepak Saxena <dsaxena@plexity.net>
   7  *
   8  * Copyright 2002 (c) Intel Corporation
   9  * Copyright 2003-2004 (c) MontaVista, Software, Inc.
  10  *
  11  * This file is licensed under  the terms of the GNU General Public
  12  * License version 2. This program is licensed "as is" without any
  13  * warranty of any kind, whether express or implied.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/mm.h>
  18 #include <linux/init.h>
  19 #include <linux/serial.h>
  20 #include <linux/sched.h>
  21 #include <linux/tty.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/serial_core.h>
  24 #include <linux/bootmem.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/bitops.h>
  27 #include <linux/time.h>
  28 #include <linux/timex.h>
  29 #include <linux/clocksource.h>
  30
  31 #include <asm/arch/udc.h>
  32 #include <asm/hardware.h>
  33 #include <asm/uaccess.h>
  34 #include <asm/io.h>
  35 #include <asm/pgtable.h>
  36 #include <asm/page.h>
  37 #include <asm/irq.h>
  38
  39 #include <asm/mach/map.h>
  40 #include <asm/mach/irq.h>
  41 #include <asm/mach/time.h>
  42
  43 static int __init ixp4xx_clocksource_init(void);
  44
  45 /*************************************************************************
  46  * IXP4xx chipset I/O mapping
  47  *************************************************************************/
  48 static struct map_desc ixp4xx_io_desc[] __initdata = {
  49         {       /* UART, Interrupt ctrl, GPIO, timers, NPEs, MACs, USB .... */
  50                 .virtual        = IXP4XX_PERIPHERAL_BASE_VIRT,
  51                 .pfn            = __phys_to_pfn(IXP4XX_PERIPHERAL_BASE_PHYS),
  52                 .length         = IXP4XX_PERIPHERAL_REGION_SIZE,
  53                 .type           = MT_DEVICE
  54         }, {    /* Expansion Bus Config Registers */
  55                 .virtual        = IXP4XX_EXP_CFG_BASE_VIRT,
  56                 .pfn            = __phys_to_pfn(IXP4XX_EXP_CFG_BASE_PHYS),
  57                 .length         = IXP4XX_EXP_CFG_REGION_SIZE,
  58                 .type           = MT_DEVICE
  59         }, {    /* PCI Registers */
  60                 .virtual        = IXP4XX_PCI_CFG_BASE_VIRT,
  61                 .pfn            = __phys_to_pfn(IXP4XX_PCI_CFG_BASE_PHYS),
  62                 .length         = IXP4XX_PCI_CFG_REGION_SIZE,
  63                 .type           = MT_DEVICE
  64         },
  65 #ifdef CONFIG_DEBUG_LL
  66         {       /* Debug UART mapping */
  67                 .virtual        = IXP4XX_DEBUG_UART_BASE_VIRT,
  68                 .pfn            = __phys_to_pfn(IXP4XX_DEBUG_UART_BASE_PHYS),
  69                 .length         = IXP4XX_DEBUG_UART_REGION_SIZE,
  70                 .type           = MT_DEVICE
  71         }
  72 #endif
  73 };
  74
  75 void __init ixp4xx_map_io(void)
  76 {
  77         iotable_init(ixp4xx_io_desc, ARRAY_SIZE(ixp4xx_io_desc));
  78 }
  79
  80
  81 /*************************************************************************
  82  * IXP4xx chipset IRQ handling
  83  *
  84  * TODO: GPIO IRQs should be marked invalid until the user of the IRQ
  85  *       (be it PCI or something else) configures that GPIO line
  86  *       as an IRQ.
  87  **************************************************************************/
  88 enum ixp4xx_irq_type {
  89         IXP4XX_IRQ_LEVEL, IXP4XX_IRQ_EDGE
  90 };
  91
  92 /* Each bit represents an IRQ: 1: edge-triggered, 0: level triggered */
  93 static unsigned long long ixp4xx_irq_edge = 0;
  94
  95 /*
  96  * IRQ -> GPIO mapping table
  97  */
  98 static signed char irq2gpio[32] = {
  99         -1, -1, -1, -1, -1, -1,  0,  1,
 100         -1, -1, -1, -1, -1, -1, -1, -1,
 101         -1, -1, -1,  2,  3,  4,  5,  6,
 102          7,  8,  9, 10, 11, 12, -1, -1,
 103 };
 104
 105 static int ixp4xx_set_irq_type(unsigned int irq, unsigned int type)
 106 {
 107         int line = irq2gpio[irq];
 108         u32 int_style;
 109         enum ixp4xx_irq_type irq_type;
 110         volatile u32 *int_reg;
 111
 112         /*
 113          * Only for GPIO IRQs
 114          */
 115         if (line < 0)
 116                 return -EINVAL;
 117
 118         switch (type){
 119         case IRQT_BOTHEDGE:
 120                 int_style = IXP4XX_GPIO_STYLE_TRANSITIONAL;
 121                 irq_type = IXP4XX_IRQ_EDGE;
 122                 break;
 123         case IRQT_RISING:
 124                 int_style = IXP4XX_GPIO_STYLE_RISING_EDGE;
 125                 irq_type = IXP4XX_IRQ_EDGE;
 126                 break;
 127         case IRQT_FALLING:
 128                 int_style = IXP4XX_GPIO_STYLE_FALLING_EDGE;
 129                 irq_type = IXP4XX_IRQ_EDGE;
 130                 break;
 131         case IRQT_HIGH:
 132                 int_style = IXP4XX_GPIO_STYLE_ACTIVE_HIGH;
 133                 irq_type = IXP4XX_IRQ_LEVEL;
 134                 break;
 135         case IRQT_LOW:
 136                 int_style = IXP4XX_GPIO_STYLE_ACTIVE_LOW;
 137                 irq_type = IXP4XX_IRQ_LEVEL;
 138                 break;
 139         default:
 140                 return -EINVAL;
 141         }
 142
 143         if (irq_type == IXP4XX_IRQ_EDGE)
 144                 ixp4xx_irq_edge |= (1 << irq);
 145         else
 146                 ixp4xx_irq_edge &= ~(1 << irq);
 147
 148         if (line >= 8) {        /* pins 8-15 */
 149                 line -= 8;
 150                 int_reg = IXP4XX_GPIO_GPIT2R;
 151         } else {                /* pins 0-7 */
 152                 int_reg = IXP4XX_GPIO_GPIT1R;
 153         }
 154
 155         /* Clear the style for the appropriate pin */
 156         *int_reg &= ~(IXP4XX_GPIO_STYLE_CLEAR <<
 157                         (line * IXP4XX_GPIO_STYLE_SIZE));
 158
 159         *IXP4XX_GPIO_GPISR = (1 << line);
 160
 161         /* Set the new style */
 162         *int_reg |= (int_style << (line * IXP4XX_GPIO_STYLE_SIZE));
 163
 164         /* Configure the line as an input */
 165         gpio_line_config(line, IXP4XX_GPIO_IN);
 166
 167         return 0;
 168 }
 169
 170 static void ixp4xx_irq_mask(unsigned int irq)
 171 {
 172         if (cpu_is_ixp46x() && irq >= 32)
 173                 *IXP4XX_ICMR2 &= ~(1 << (irq - 32));
 174         else
 175                 *IXP4XX_ICMR &= ~(1 << irq);
 176 }
 177
 178 static void ixp4xx_irq_ack(unsigned int irq)
 179 {
 180         int line = (irq < 32) ? irq2gpio[irq] : -1;
 181
 182         if (line >= 0)
 183                 *IXP4XX_GPIO_GPISR = (1 << line);
 184 }
 185
 186 /*
 187  * Level triggered interrupts on GPIO lines can only be cleared when the
 188  * interrupt condition disappears.
 189  */
 190 static void ixp4xx_irq_unmask(unsigned int irq)
 191 {
 192         if (!(ixp4xx_irq_edge & (1 << irq)))
 193                 ixp4xx_irq_ack(irq);
 194
 195         if (cpu_is_ixp46x() && irq >= 32)
 196                 *IXP4XX_ICMR2 |= (1 << (irq - 32));
 197         else
 198                 *IXP4XX_ICMR |= (1 << irq);
 199 }
 200
 201 static struct irq_chip ixp4xx_irq_chip = {
 202         .name           = "IXP4xx",
 203         .ack            = ixp4xx_irq_ack,
 204         .mask           = ixp4xx_irq_mask,
 205         .unmask         = ixp4xx_irq_unmask,
 206         .set_type       = ixp4xx_set_irq_type,
 207 };
 208
 209 void __init ixp4xx_init_irq(void)
 210 {
 211         int i = 0;
 212
 213         /* Route all sources to IRQ instead of FIQ */
 214         *IXP4XX_ICLR = 0x0;
 215
 216         /* Disable all interrupt */
 217         *IXP4XX_ICMR = 0x0;
 218
 219         if (cpu_is_ixp46x()) {
 220                 /* Route upper 32 sources to IRQ instead of FIQ */
 221                 *IXP4XX_ICLR2 = 0x00;
 222
 223                 /* Disable upper 32 interrupts */
 224                 *IXP4XX_ICMR2 = 0x00;
 225         }
 226
 227         /* Default to all level triggered */
 228         for(i = 0; i < NR_IRQS; i++) {
 229                 set_irq_chip(i, &ixp4xx_irq_chip);
 230                 set_irq_handler(i, handle_level_irq);
 231                 set_irq_flags(i, IRQF_VALID);
 232         }
 233 }
 234
 235
 236 /*************************************************************************
 237  * IXP4xx timer tick
 238  * We use OS timer1 on the CPU for the timer tick and the timestamp
 239  * counter as a source of real clock ticks to account for missed jiffies.
 240  *************************************************************************/
 241
 242 static unsigned volatile last_jiffy_time;
 243
 244 #define CLOCK_TICKS_PER_USEC    ((CLOCK_TICK_RATE + USEC_PER_SEC/2) / USEC_PER_SEC)
 245
 246 static irqreturn_t ixp4xx_timer_interrupt(int irq, void *dev_id)
 247 {
 248         write_seqlock(&xtime_lock);
 249
 250         /* Clear Pending Interrupt by writing '1' to it */
 251         *IXP4XX_OSST = IXP4XX_OSST_TIMER_1_PEND;
 252
 253         /*
 254          * Catch up with the real idea of time
 255          */
 256         while ((signed long)(*IXP4XX_OSTS - last_jiffy_time) >= LATCH) {
 257                 timer_tick();
 258                 last_jiffy_time += LATCH;
 259         }
 260
 261         write_sequnlock(&xtime_lock);
 262
 263         return IRQ_HANDLED;
 264 }
 265
 266 static struct irqaction ixp4xx_timer_irq = {
 267         .name           = "IXP4xx Timer Tick",
 268         .flags          = IRQF_DISABLED | IRQF_TIMER,
 269         .handler        = ixp4xx_timer_interrupt,
 270 };
 271
 272 static void __init ixp4xx_timer_init(void)
 273 {
 274         /* Clear Pending Interrupt by writing '1' to it */
 275         *IXP4XX_OSST = IXP4XX_OSST_TIMER_1_PEND;
 276
 277         /* Setup the Timer counter value */
 278         *IXP4XX_OSRT1 = (LATCH & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE;
 279
 280         /* Reset time-stamp counter */
 281         *IXP4XX_OSTS = 0;
 282         last_jiffy_time = 0;
 283
 284         /* Connect the interrupt handler and enable the interrupt */
 285         setup_irq(IRQ_IXP4XX_TIMER1, &ixp4xx_timer_irq);
 286
 287         ixp4xx_clocksource_init();
 288 }
 289
 290 struct sys_timer ixp4xx_timer = {
 291         .init           = ixp4xx_timer_init,
 292 };
 293
 294 static struct pxa2xx_udc_mach_info ixp4xx_udc_info;
 295
 296 void __init ixp4xx_set_udc_info(struct pxa2xx_udc_mach_info *info)
 297 {
 298         memcpy(&ixp4xx_udc_info, info, sizeof *info);
 299 }
 300
 301 static struct resource ixp4xx_udc_resources[] = {
 302         [0] = {
 303                 .start  = 0xc800b000,
 304                 .end    = 0xc800bfff,
 305                 .flags  = IORESOURCE_MEM,
 306         },
 307         [1] = {
 308                 .start  = IRQ_IXP4XX_USB,
 309                 .end    = IRQ_IXP4XX_USB,
 310                 .flags  = IORESOURCE_IRQ,
 311         },
 312 };
 313
 314 /*
 315  * USB device controller. The IXP4xx uses the same controller as PXA2XX,
 316  * so we just use the same device.
 317  */
 318 static struct platform_device ixp4xx_udc_device = {
 319         .name           = "pxa2xx-udc",
 320         .id             = -1,
 321         .num_resources  = 2,
 322         .resource       = ixp4xx_udc_resources,
 323         .dev            = {
 324                 .platform_data = &ixp4xx_udc_info,
 325         },
 326 };
 327
 328 static struct platform_device *ixp4xx_devices[] __initdata = {
 329         &ixp4xx_udc_device,
 330 };
 331
 332 static struct resource ixp46x_i2c_resources[] = {
 333         [0] = {
 334                 .start  = 0xc8011000,
 335                 .end    = 0xc801101c,
 336                 .flags  = IORESOURCE_MEM,
 337         },
 338         [1] = {
 339                 .start  = IRQ_IXP4XX_I2C,
 340                 .end    = IRQ_IXP4XX_I2C,
 341                 .flags  = IORESOURCE_IRQ
 342         }
 343 };
 344
 345 /*
 346  * I2C controller. The IXP46x uses the same block as the IOP3xx, so
 347  * we just use the same device name.
 348  */
 349 static struct platform_device ixp46x_i2c_controller = {
 350         .name           = "IOP3xx-I2C",
 351         .id             = 0,
 352         .num_resources  = 2,
 353         .resource       = ixp46x_i2c_resources
 354 };
 355
 356 static struct platform_device *ixp46x_devices[] __initdata = {
 357         &ixp46x_i2c_controller
 358 };
 359
 360 unsigned long ixp4xx_exp_bus_size;
 361 EXPORT_SYMBOL(ixp4xx_exp_bus_size);
 362
 363 void __init ixp4xx_sys_init(void)
 364 {
 365         ixp4xx_exp_bus_size = SZ_16M;
 366
 367         platform_add_devices(ixp4xx_devices, ARRAY_SIZE(ixp4xx_devices));
 368
 369         if (cpu_is_ixp46x()) {
 370                 int region;
 371
 372                 platform_add_devices(ixp46x_devices,
 373                                 ARRAY_SIZE(ixp46x_devices));
 374
 375                 for (region = 0; region < 7; region++) {
 376                         if((*(IXP4XX_EXP_REG(0x4 * region)) & 0x200)) {
 377                                 ixp4xx_exp_bus_size = SZ_32M;
 378                                 break;
 379                         }
 380                 }
 381         }
 382
 383         printk("IXP4xx: Using %luMiB expansion bus window size\n",
 384                         ixp4xx_exp_bus_size >> 20);
 385 }
 386
 387 cycle_t ixp4xx_get_cycles(void)
 388 {
 389         return *IXP4XX_OSTS;
 390 }
 391
 392 static struct clocksource clocksource_ixp4xx = {
 393         .name           = "OSTS",
 394         .rating         = 200,
 395         .read           = ixp4xx_get_cycles,
 396         .mask           = CLOCKSOURCE_MASK(32),
 397         .shift          = 20,
 398         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 399 };
 400
 401 unsigned long ixp4xx_timer_freq = FREQ;
 402 static int __init ixp4xx_clocksource_init(void)
 403 {
 404         clocksource_ixp4xx.mult =
 405                 clocksource_hz2mult(ixp4xx_timer_freq,
 406                                     clocksource_ixp4xx.shift);
 407         clocksource_register(&clocksource_ixp4xx);
 408
 409         return 0;
 410 }