release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/pnx833x/common/interrupts.c

   1 /*
   2  *  interrupts.c: Interrupt mappings for PNX833X.
   3  *
   4  *  Copyright 2008 NXP Semiconductors
   5  *        Chris Steel <chris.steel@nxp.com>
   6  *    Daniel Laird <daniel.j.laird@nxp.com>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22 #include <linux/kernel.h>
  23 #include <linux/irq.h>
  24 #include <linux/hardirq.h>
  25 #include <linux/interrupt.h>
  26 #include <asm/mipsregs.h>
  27 #include <asm/irq_cpu.h>
  28 #include <irq.h>
  29 #include <irq-mapping.h>
  30 #include <gpio.h>
  31
  32 static int mips_cpu_timer_irq;
  33
  34 static const unsigned int irq_prio[PNX833X_PIC_NUM_IRQ] =
  35 {
  36     0, /* unused */
  37     4, /* PNX833X_PIC_I2C0_INT                 1 */
  38     4, /* PNX833X_PIC_I2C1_INT                 2 */
  39     1, /* PNX833X_PIC_UART0_INT                3 */
  40     1, /* PNX833X_PIC_UART1_INT                4 */
  41     6, /* PNX833X_PIC_TS_IN0_DV_INT            5 */
  42     6, /* PNX833X_PIC_TS_IN0_DMA_INT           6 */
  43     7, /* PNX833X_PIC_GPIO_INT                 7 */
  44     4, /* PNX833X_PIC_AUDIO_DEC_INT            8 */
  45     5, /* PNX833X_PIC_VIDEO_DEC_INT            9 */
  46     4, /* PNX833X_PIC_CONFIG_INT              10 */
  47     4, /* PNX833X_PIC_AOI_INT                 11 */
  48     9, /* PNX833X_PIC_SYNC_INT                12 */
  49     9, /* PNX8335_PIC_SATA_INT                13 */
  50     4, /* PNX833X_PIC_OSD_INT                 14 */
  51     9, /* PNX833X_PIC_DISP1_INT               15 */
  52     4, /* PNX833X_PIC_DEINTERLACER_INT        16 */
  53     9, /* PNX833X_PIC_DISPLAY2_INT            17 */
  54     4, /* PNX833X_PIC_VC_INT                  18 */
  55     4, /* PNX833X_PIC_SC_INT                  19 */
  56     9, /* PNX833X_PIC_IDE_INT                 20 */
  57     9, /* PNX833X_PIC_IDE_DMA_INT             21 */
  58     6, /* PNX833X_PIC_TS_IN1_DV_INT           22 */
  59     6, /* PNX833X_PIC_TS_IN1_DMA_INT          23 */
  60     4, /* PNX833X_PIC_SGDX_DMA_INT            24 */
  61     4, /* PNX833X_PIC_TS_OUT_INT              25 */
  62     4, /* PNX833X_PIC_IR_INT                  26 */
  63     3, /* PNX833X_PIC_VMSP1_INT               27 */
  64     3, /* PNX833X_PIC_VMSP2_INT               28 */
  65     4, /* PNX833X_PIC_PIBC_INT                29 */
  66     4, /* PNX833X_PIC_TS_IN0_TRD_INT          30 */
  67     4, /* PNX833X_PIC_SGDX_TPD_INT            31 */
  68     5, /* PNX833X_PIC_USB_INT                 32 */
  69     4, /* PNX833X_PIC_TS_IN1_TRD_INT          33 */
  70     4, /* PNX833X_PIC_CLOCK_INT               34 */
  71     4, /* PNX833X_PIC_SGDX_PARSER_INT         35 */
  72     4, /* PNX833X_PIC_VMSP_DMA_INT            36 */
  73 #if defined(CONFIG_SOC_PNX8335)
  74     4, /* PNX8335_PIC_MIU_INT                 37 */
  75     4, /* PNX8335_PIC_AVCHIP_IRQ_INT          38 */
  76     9, /* PNX8335_PIC_SYNC_HD_INT             39 */
  77     9, /* PNX8335_PIC_DISP_HD_INT             40 */
  78     9, /* PNX8335_PIC_DISP_SCALER_INT         41 */
  79     4, /* PNX8335_PIC_OSD_HD1_INT             42 */
  80     4, /* PNX8335_PIC_DTL_WRITER_Y_INT        43 */
  81     4, /* PNX8335_PIC_DTL_WRITER_C_INT        44 */
  82     4, /* PNX8335_PIC_DTL_EMULATOR_Y_IR_INT   45 */
  83     4, /* PNX8335_PIC_DTL_EMULATOR_C_IR_INT   46 */
  84     4, /* PNX8335_PIC_DENC_TTX_INT            47 */
  85     4, /* PNX8335_PIC_MMI_SIF0_INT            48 */
  86     4, /* PNX8335_PIC_MMI_SIF1_INT            49 */
  87     4, /* PNX8335_PIC_MMI_CDMMU_INT           50 */
  88     4, /* PNX8335_PIC_PIBCS_INT               51 */
  89    12, /* PNX8335_PIC_ETHERNET_INT            52 */
  90     3, /* PNX8335_PIC_VMSP1_0_INT             53 */
  91     3, /* PNX8335_PIC_VMSP1_1_INT             54 */
  92     4, /* PNX8335_PIC_VMSP1_DMA_INT           55 */
  93     4, /* PNX8335_PIC_TDGR_DE_INT             56 */
  94     4, /* PNX8335_PIC_IR1_IRQ_INT             57 */
  95 #endif
  96 };
  97
  98 static void pnx833x_timer_dispatch(void)
  99 {
 100         do_IRQ(mips_cpu_timer_irq);
 101 }
 102
 103 static void pic_dispatch(void)
 104 {
 105         unsigned int irq = PNX833X_REGFIELD(PIC_INT_SRC, INT_SRC);
 106
 107         if ((irq >= 1) && (irq < (PNX833X_PIC_NUM_IRQ))) {
 108                 unsigned long priority = PNX833X_PIC_INT_PRIORITY;
 109                 PNX833X_PIC_INT_PRIORITY = irq_prio[irq];
 110
 111                 if (irq == PNX833X_PIC_GPIO_INT) {
 112                         unsigned long mask = PNX833X_PIO_INT_STATUS & PNX833X_PIO_INT_ENABLE;
 113                         int pin;
 114                         while ((pin = ffs(mask & 0xffff))) {
 115                                 pin -= 1;
 116                                 do_IRQ(PNX833X_GPIO_IRQ_BASE + pin);
 117                                 mask &= ~(1 << pin);
 118                         }
 119                 } else {
 120                         do_IRQ(irq + PNX833X_PIC_IRQ_BASE);
 121                 }
 122
 123                 PNX833X_PIC_INT_PRIORITY = priority;
 124         } else {
 125                 printk(KERN_ERR "plat_irq_dispatch: unexpected irq %u\n", irq);
 126         }
 127 }
 128
 129 asmlinkage void plat_irq_dispatch(void)
 130 {
 131         unsigned int pending = read_c0_status() & read_c0_cause();
 132
 133         if (pending & STATUSF_IP4)
 134                 pic_dispatch();
 135         else if (pending & STATUSF_IP7)
 136                 do_IRQ(PNX833X_TIMER_IRQ);
 137         else
 138                 spurious_interrupt();
 139 }
 140
 141 static inline void pnx833x_hard_enable_pic_irq(unsigned int irq)
 142 {
 143         /* Currently we do this by setting IRQ priority to 1.
 144            If priority support is being implemented, 1 should be repalced
 145                 by a better value. */
 146         PNX833X_PIC_INT_REG(irq) = irq_prio[irq];
 147 }
 148
 149 static inline void pnx833x_hard_disable_pic_irq(unsigned int irq)
 150 {
 151         /* Disable IRQ by writing setting it's priority to 0 */
 152         PNX833X_PIC_INT_REG(irq) = 0;
 153 }
 154
 155 static int irqflags[PNX833X_PIC_NUM_IRQ];       /* initialized by zeroes */
 156 #define IRQFLAG_STARTED         1
 157 #define IRQFLAG_DISABLED        2
 158
 159 static DEFINE_RAW_SPINLOCK(pnx833x_irq_lock);
 160
 161 static unsigned int pnx833x_startup_pic_irq(unsigned int irq)
 162 {
 163         unsigned long flags;
 164         unsigned int pic_irq = irq - PNX833X_PIC_IRQ_BASE;
 165
 166         raw_spin_lock_irqsave(&pnx833x_irq_lock, flags);
 167
 168         irqflags[pic_irq] = IRQFLAG_STARTED;    /* started, not disabled */
 169         pnx833x_hard_enable_pic_irq(pic_irq);
 170
 171         raw_spin_unlock_irqrestore(&pnx833x_irq_lock, flags);
 172         return 0;
 173 }
 174
 175 static void pnx833x_shutdown_pic_irq(unsigned int irq)
 176 {
 177         unsigned long flags;
 178         unsigned int pic_irq = irq - PNX833X_PIC_IRQ_BASE;
 179
 180         raw_spin_lock_irqsave(&pnx833x_irq_lock, flags);
 181
 182         irqflags[pic_irq] = 0;                  /* not started */
 183         pnx833x_hard_disable_pic_irq(pic_irq);
 184
 185         raw_spin_unlock_irqrestore(&pnx833x_irq_lock, flags);
 186 }
 187
 188 static void pnx833x_enable_pic_irq(unsigned int irq)
 189 {
 190         unsigned long flags;
 191         unsigned int pic_irq = irq - PNX833X_PIC_IRQ_BASE;
 192
 193         raw_spin_lock_irqsave(&pnx833x_irq_lock, flags);
 194
 195         irqflags[pic_irq] &= ~IRQFLAG_DISABLED;
 196         if (irqflags[pic_irq] == IRQFLAG_STARTED)
 197                 pnx833x_hard_enable_pic_irq(pic_irq);
 198
 199         raw_spin_unlock_irqrestore(&pnx833x_irq_lock, flags);
 200 }
 201
 202 static void pnx833x_disable_pic_irq(unsigned int irq)
 203 {
 204         unsigned long flags;
 205         unsigned int pic_irq = irq - PNX833X_PIC_IRQ_BASE;
 206
 207         raw_spin_lock_irqsave(&pnx833x_irq_lock, flags);
 208
 209         irqflags[pic_irq] |= IRQFLAG_DISABLED;
 210         pnx833x_hard_disable_pic_irq(pic_irq);
 211
 212         raw_spin_unlock_irqrestore(&pnx833x_irq_lock, flags);
 213 }
 214
 215 static void pnx833x_ack_pic_irq(unsigned int irq)
 216 {
 217 }
 218
 219 static void pnx833x_end_pic_irq(unsigned int irq)
 220 {
 221 }
 222
 223 static DEFINE_RAW_SPINLOCK(pnx833x_gpio_pnx833x_irq_lock);
 224
 225 static unsigned int pnx833x_startup_gpio_irq(unsigned int irq)
 226 {
 227         int pin = irq - PNX833X_GPIO_IRQ_BASE;
 228         unsigned long flags;
 229         raw_spin_lock_irqsave(&pnx833x_gpio_pnx833x_irq_lock, flags);
 230         pnx833x_gpio_enable_irq(pin);
 231         raw_spin_unlock_irqrestore(&pnx833x_gpio_pnx833x_irq_lock, flags);
 232         return 0;
 233 }
 234
 235 static void pnx833x_enable_gpio_irq(unsigned int irq)
 236 {
 237         int pin = irq - PNX833X_GPIO_IRQ_BASE;
 238         unsigned long flags;
 239         raw_spin_lock_irqsave(&pnx833x_gpio_pnx833x_irq_lock, flags);
 240         pnx833x_gpio_enable_irq(pin);
 241         raw_spin_unlock_irqrestore(&pnx833x_gpio_pnx833x_irq_lock, flags);
 242 }
 243
 244 static void pnx833x_disable_gpio_irq(unsigned int irq)
 245 {
 246         int pin = irq - PNX833X_GPIO_IRQ_BASE;
 247         unsigned long flags;
 248         raw_spin_lock_irqsave(&pnx833x_gpio_pnx833x_irq_lock, flags);
 249         pnx833x_gpio_disable_irq(pin);
 250         raw_spin_unlock_irqrestore(&pnx833x_gpio_pnx833x_irq_lock, flags);
 251 }
 252
 253 static void pnx833x_ack_gpio_irq(unsigned int irq)
 254 {
 255 }
 256
 257 static void pnx833x_end_gpio_irq(unsigned int irq)
 258 {
 259         int pin = irq - PNX833X_GPIO_IRQ_BASE;
 260         unsigned long flags;
 261         raw_spin_lock_irqsave(&pnx833x_gpio_pnx833x_irq_lock, flags);
 262         pnx833x_gpio_clear_irq(pin);
 263         raw_spin_unlock_irqrestore(&pnx833x_gpio_pnx833x_irq_lock, flags);
 264 }
 265
 266 static int pnx833x_set_type_gpio_irq(unsigned int irq, unsigned int flow_type)
 267 {
 268         int pin = irq - PNX833X_GPIO_IRQ_BASE;
 269         int gpio_mode;
 270
 271         switch (flow_type) {
 272         case IRQ_TYPE_EDGE_RISING:
 273                 gpio_mode = GPIO_INT_EDGE_RISING;
 274                 break;
 275         case IRQ_TYPE_EDGE_FALLING:
 276                 gpio_mode = GPIO_INT_EDGE_FALLING;
 277                 break;
 278         case IRQ_TYPE_EDGE_BOTH:
 279                 gpio_mode = GPIO_INT_EDGE_BOTH;
 280                 break;
 281         case IRQ_TYPE_LEVEL_HIGH:
 282                 gpio_mode = GPIO_INT_LEVEL_HIGH;
 283                 break;
 284         case IRQ_TYPE_LEVEL_LOW:
 285                 gpio_mode = GPIO_INT_LEVEL_LOW;
 286                 break;
 287         default:
 288                 gpio_mode = GPIO_INT_NONE;
 289                 break;
 290         }
 291
 292         pnx833x_gpio_setup_irq(gpio_mode, pin);
 293
 294         return 0;
 295 }
 296
 297 static struct irq_chip pnx833x_pic_irq_type = {
 298         .name = "PNX-PIC",
 299         .startup = pnx833x_startup_pic_irq,
 300         .shutdown = pnx833x_shutdown_pic_irq,
 301         .enable = pnx833x_enable_pic_irq,
 302         .disable = pnx833x_disable_pic_irq,
 303         .ack = pnx833x_ack_pic_irq,
 304         .end = pnx833x_end_pic_irq
 305 };
 306
 307 static struct irq_chip pnx833x_gpio_irq_type = {
 308         .name = "PNX-GPIO",
 309         .startup = pnx833x_startup_gpio_irq,
 310         .shutdown = pnx833x_disable_gpio_irq,
 311         .enable = pnx833x_enable_gpio_irq,
 312         .disable = pnx833x_disable_gpio_irq,
 313         .ack = pnx833x_ack_gpio_irq,
 314         .end = pnx833x_end_gpio_irq,
 315         .set_type = pnx833x_set_type_gpio_irq
 316 };
 317
 318 void __init arch_init_irq(void)
 319 {
 320         unsigned int irq;
 321
 322         /* setup standard internal cpu irqs */
 323         mips_cpu_irq_init();
 324
 325         /* Set IRQ information in irq_desc */
 326         for (irq = PNX833X_PIC_IRQ_BASE; irq < (PNX833X_PIC_IRQ_BASE + PNX833X_PIC_NUM_IRQ); irq++) {
 327                 pnx833x_hard_disable_pic_irq(irq);
 328                 set_irq_chip_and_handler(irq, &pnx833x_pic_irq_type, handle_simple_irq);
 329         }
 330
 331         for (irq = PNX833X_GPIO_IRQ_BASE; irq < (PNX833X_GPIO_IRQ_BASE + PNX833X_GPIO_NUM_IRQ); irq++)
 332                 set_irq_chip_and_handler(irq, &pnx833x_gpio_irq_type, handle_simple_irq);
 333
 334         /* Set PIC priority limiter register to 0 */
 335         PNX833X_PIC_INT_PRIORITY = 0;
 336
 337         /* Setup GPIO IRQ dispatching */
 338         pnx833x_startup_pic_irq(PNX833X_PIC_GPIO_INT);
 339
 340         /* Enable PIC IRQs (HWIRQ2) */
 341         if (cpu_has_vint)
 342                 set_vi_handler(4, pic_dispatch);
 343
 344         write_c0_status(read_c0_status() | IE_IRQ2);
 345 }
 346
 347 unsigned int __cpuinit get_c0_compare_int(void)
 348 {
 349         if (cpu_has_vint)
 350                 set_vi_handler(cp0_compare_irq, pnx833x_timer_dispatch);
 351
 352         mips_cpu_timer_irq = MIPS_CPU_IRQ_BASE + cp0_compare_irq;
 353         return mips_cpu_timer_irq;
 354 }
 355
 356 void __init plat_time_init(void)
 357 {
 358         /* calculate mips_hpt_frequency based on PNX833X_CLOCK_CPUCP_CTL reg */
 359
 360         extern unsigned long mips_hpt_frequency;
 361         unsigned long reg = PNX833X_CLOCK_CPUCP_CTL;
 362
 363         if (!(PNX833X_BIT(reg, CLOCK_CPUCP_CTL, EXIT_RESET))) {
 364                 /* Functional clock is disabled so use crystal frequency */
 365                 mips_hpt_frequency = 25;
 366         } else {
 367 #if defined(CONFIG_SOC_PNX8335)
 368                 /* Functional clock is enabled, so get clock multiplier */
 369                 mips_hpt_frequency = 90 + (10 * PNX8335_REGFIELD(CLOCK_PLL_CPU_CTL, FREQ));
 370 #else
 371                 static const unsigned long int freq[4] = {240, 160, 120, 80};
 372                 mips_hpt_frequency = freq[PNX833X_FIELD(reg, CLOCK_CPUCP_CTL, DIV_CLOCK)];
 373 #endif
 374         }
 375
 376         printk(KERN_INFO "CPU clock is %ld MHz\n", mips_hpt_frequency);
 377
 378         mips_hpt_frequency *= 500000;
 379 }