arch/arm/mach-ixp2000/ixdp2x01.c

   1 /*
   2  * arch/arm/mach-ixp2000/ixdp2x01.c
   3  *
   4  * Code common to Intel IXDP2401 and IXDP2801 platforms
   5  *
   6  * Original Author: Andrzej Mialkowski <andrzej.mialkowski@intel.com>
   7  * Maintainer: Deepak Saxena <dsaxena@plexity.net>
   8  *
   9  * Copyright (C) 2002-2003 Intel Corp.
  10  * Copyright (C) 2003-2004 MontaVista Software, Inc.
  11  *
  12  *  This program is free software; you can redistribute  it and/or modify it
  13  *  under  the terms of  the GNU General  Public License as published by the
  14  *  Free Software Foundation;  either version 2 of the  License, or (at your
  15  *  option) any later version.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/mm.h>
  21 #include <linux/sched.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/bitops.h>
  24 #include <linux/pci.h>
  25 #include <linux/ioport.h>
  26 #include <linux/delay.h>
  27 #include <linux/serial.h>
  28 #include <linux/tty.h>
  29 #include <linux/serial_core.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/serial_8250.h>
  32 #include <linux/io.h>
  33
  34 #include <asm/irq.h>
  35 #include <asm/pgtable.h>
  36 #include <asm/page.h>
  37 #include <asm/system.h>
  38 #include <mach/hardware.h>
  39 #include <asm/mach-types.h>
  40
  41 #include <asm/mach/pci.h>
  42 #include <asm/mach/map.h>
  43 #include <asm/mach/irq.h>
  44 #include <asm/mach/time.h>
  45 #include <asm/mach/arch.h>
  46 #include <asm/mach/flash.h>
  47
  48 /*************************************************************************
  49  * IXDP2x01 IRQ Handling
  50  *************************************************************************/
  51 static void ixdp2x01_irq_mask(struct irq_data *d)
  52 {
  53         ixp2000_reg_wrb(IXDP2X01_INT_MASK_SET_REG,
  54                                 IXP2000_BOARD_IRQ_MASK(d->irq));
  55 }
  56
  57 static void ixdp2x01_irq_unmask(struct irq_data *d)
  58 {
  59         ixp2000_reg_write(IXDP2X01_INT_MASK_CLR_REG,
  60                                 IXP2000_BOARD_IRQ_MASK(d->irq));
  61 }
  62
  63 static u32 valid_irq_mask;
  64
  65 static void ixdp2x01_irq_handler(unsigned int irq, struct irq_desc *desc)
  66 {
  67         u32 ex_interrupt;
  68         int i;
  69
  70         desc->irq_data.chip->irq_mask(&desc->irq_data);
  71
  72         ex_interrupt = *IXDP2X01_INT_STAT_REG & valid_irq_mask;
  73
  74         if (!ex_interrupt) {
  75                 printk(KERN_ERR "Spurious IXDP2X01 CPLD interrupt!\n");
  76                 return;
  77         }
  78
  79         for (i = 0; i < IXP2000_BOARD_IRQS; i++) {
  80                 if (ex_interrupt & (1 << i)) {
  81                         int cpld_irq = IXP2000_BOARD_IRQ(0) + i;
  82                         generic_handle_irq(cpld_irq);
  83                 }
  84         }
  85
  86         desc->irq_data.chip->irq_unmask(&desc->irq_data);
  87 }
  88
  89 static struct irq_chip ixdp2x01_irq_chip = {
  90         .irq_mask       = ixdp2x01_irq_mask,
  91         .irq_ack        = ixdp2x01_irq_mask,
  92         .irq_unmask     = ixdp2x01_irq_unmask
  93 };
  94
  95 /*
  96  * We only do anything if we are the master NPU on the board.
  97  * The slave NPU only has the ethernet chip going directly to
  98  * the PCIB interrupt input.
  99  */
 100 void __init ixdp2x01_init_irq(void)
 101 {
 102         int irq = 0;
 103
 104         /* initialize chip specific interrupts */
 105         ixp2000_init_irq();
 106
 107         if (machine_is_ixdp2401())
 108                 valid_irq_mask = IXDP2401_VALID_IRQ_MASK;
 109         else
 110                 valid_irq_mask = IXDP2801_VALID_IRQ_MASK;
 111
 112         /* Mask all interrupts from CPLD, disable simulation */
 113         ixp2000_reg_write(IXDP2X01_INT_MASK_SET_REG, 0xffffffff);
 114         ixp2000_reg_wrb(IXDP2X01_INT_SIM_REG, 0);
 115
 116         for (irq = NR_IXP2000_IRQS; irq < NR_IXDP2X01_IRQS; irq++) {
 117                 if (irq & valid_irq_mask) {
 118                         irq_set_chip_and_handler(irq, &ixdp2x01_irq_chip,
 119                                                  handle_level_irq);
 120                         set_irq_flags(irq, IRQF_VALID);
 121                 } else {
 122                         set_irq_flags(irq, 0);
 123                 }
 124         }
 125
 126         /* Hook into PCI interrupts */
 127         irq_set_chained_handler(IRQ_IXP2000_PCIB, ixdp2x01_irq_handler);
 128 }
 129
 130
 131 /*************************************************************************
 132  * IXDP2x01 memory map
 133  *************************************************************************/
 134 static struct map_desc ixdp2x01_io_desc __initdata = {
 135         .virtual        = IXDP2X01_VIRT_CPLD_BASE,
 136         .pfn            = __phys_to_pfn(IXDP2X01_PHYS_CPLD_BASE),
 137         .length         = IXDP2X01_CPLD_REGION_SIZE,
 138         .type           = MT_DEVICE
 139 };
 140
 141 static void __init ixdp2x01_map_io(void)
 142 {
 143         ixp2000_map_io();
 144         iotable_init(&ixdp2x01_io_desc, 1);
 145 }
 146
 147
 148 /*************************************************************************
 149  * IXDP2x01 serial ports
 150  *************************************************************************/
 151 static struct plat_serial8250_port ixdp2x01_serial_port1[] = {
 152         {
 153                 .mapbase        = (unsigned long)IXDP2X01_UART1_PHYS_BASE,
 154                 .membase        = (char *)IXDP2X01_UART1_VIRT_BASE,
 155                 .irq            = IRQ_IXDP2X01_UART1,
 156                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
 157                 .iotype         = UPIO_MEM32,
 158                 .regshift       = 2,
 159                 .uartclk        = IXDP2X01_UART_CLK,
 160         },
 161         { }
 162 };
 163
 164 static struct resource ixdp2x01_uart_resource1 = {
 165         .start          = IXDP2X01_UART1_PHYS_BASE,
 166         .end            = IXDP2X01_UART1_PHYS_BASE + 0xffff,
 167         .flags          = IORESOURCE_MEM,
 168 };
 169
 170 static struct platform_device ixdp2x01_serial_device1 = {
 171         .name           = "serial8250",
 172         .id             = PLAT8250_DEV_PLATFORM1,
 173         .dev            = {
 174                 .platform_data          = ixdp2x01_serial_port1,
 175         },
 176         .num_resources  = 1,
 177         .resource       = &ixdp2x01_uart_resource1,
 178 };
 179
 180 static struct plat_serial8250_port ixdp2x01_serial_port2[] = {
 181         {
 182                 .mapbase        = (unsigned long)IXDP2X01_UART2_PHYS_BASE,
 183                 .membase        = (char *)IXDP2X01_UART2_VIRT_BASE,
 184                 .irq            = IRQ_IXDP2X01_UART2,
 185                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
 186                 .iotype         = UPIO_MEM32,
 187                 .regshift       = 2,
 188                 .uartclk        = IXDP2X01_UART_CLK,
 189         },
 190         { }
 191 };
 192
 193 static struct resource ixdp2x01_uart_resource2 = {
 194         .start          = IXDP2X01_UART2_PHYS_BASE,
 195         .end            = IXDP2X01_UART2_PHYS_BASE + 0xffff,
 196         .flags          = IORESOURCE_MEM,
 197 };
 198
 199 static struct platform_device ixdp2x01_serial_device2 = {
 200         .name           = "serial8250",
 201         .id             = PLAT8250_DEV_PLATFORM2,
 202         .dev            = {
 203                 .platform_data          = ixdp2x01_serial_port2,
 204         },
 205         .num_resources  = 1,
 206         .resource       = &ixdp2x01_uart_resource2,
 207 };
 208
 209 static void ixdp2x01_uart_init(void)
 210 {
 211         platform_device_register(&ixdp2x01_serial_device1);
 212         platform_device_register(&ixdp2x01_serial_device2);
 213 }
 214
 215
 216 /*************************************************************************
 217  * IXDP2x01 timer tick configuration
 218  *************************************************************************/
 219 static unsigned int ixdp2x01_clock;
 220
 221 static int __init ixdp2x01_clock_setup(char *str)
 222 {
 223         ixdp2x01_clock = simple_strtoul(str, NULL, 10);
 224
 225         return 1;
 226 }
 227
 228 __setup("ixdp2x01_clock=", ixdp2x01_clock_setup);
 229
 230 static void __init ixdp2x01_timer_init(void)
 231 {
 232         if (!ixdp2x01_clock)
 233                 ixdp2x01_clock = 50000000;
 234
 235         ixp2000_init_time(ixdp2x01_clock);
 236 }
 237
 238 static struct sys_timer ixdp2x01_timer = {
 239         .init           = ixdp2x01_timer_init,
 240         .offset         = ixp2000_gettimeoffset,
 241 };
 242
 243 /*************************************************************************
 244  * IXDP2x01 PCI
 245  *************************************************************************/
 246 void __init ixdp2x01_pci_preinit(void)
 247 {
 248         ixp2000_reg_write(IXP2000_PCI_ADDR_EXT, 0x00000000);
 249         ixp2000_pci_preinit();
 250         pcibios_setup("firmware");
 251 }
 252
 253 #define DEVPIN(dev, pin) ((pin) | ((dev) << 3))
 254
 255 static int __init ixdp2x01_pci_map_irq(const struct pci_dev *dev, u8 slot,
 256         u8 pin)
 257 {
 258         u8 bus = dev->bus->number;
 259         u32 devpin = DEVPIN(PCI_SLOT(dev->devfn), pin);
 260         struct pci_bus *tmp_bus = dev->bus;
 261
 262         /* Primary bus, no interrupts here */
 263         if (bus == 0) {
 264                 return -1;
 265         }
 266
 267         /* Lookup first leaf in bus tree */
 268         while ((tmp_bus->parent != NULL) && (tmp_bus->parent->parent != NULL)) {
 269                 tmp_bus = tmp_bus->parent;
 270         }
 271
 272         /* Select between known bridges */
 273         switch (tmp_bus->self->devfn | (tmp_bus->self->bus->number << 8)) {
 274         /* Device is located after first MB bridge */
 275         case 0x0008:
 276                 if (tmp_bus == dev->bus) {
 277                         /* Device is located directly after first MB bridge */
 278                         switch (devpin) {
 279                         case DEVPIN(1, 1):      /* Onboard 82546 ch 0 */
 280                                 if (machine_is_ixdp2401())
 281                                         return IRQ_IXDP2401_INTA_82546;
 282                                 return -1;
 283                         case DEVPIN(1, 2):      /* Onboard 82546 ch 1 */
 284                                 if (machine_is_ixdp2401())
 285                                         return IRQ_IXDP2401_INTB_82546;
 286                                 return -1;
 287                         case DEVPIN(0, 1):      /* PMC INTA# */
 288                                 return IRQ_IXDP2X01_SPCI_PMC_INTA;
 289                         case DEVPIN(0, 2):      /* PMC INTB# */
 290                                 return IRQ_IXDP2X01_SPCI_PMC_INTB;
 291                         case DEVPIN(0, 3):      /* PMC INTC# */
 292                                 return IRQ_IXDP2X01_SPCI_PMC_INTC;
 293                         case DEVPIN(0, 4):      /* PMC INTD# */
 294                                 return IRQ_IXDP2X01_SPCI_PMC_INTD;
 295                         }
 296                 }
 297                 break;
 298         case 0x0010:
 299                 if (tmp_bus == dev->bus) {
 300                         /* Device is located directly after second MB bridge */
 301                         /* Secondary bus of second bridge */
 302                         switch (devpin) {
 303                         case DEVPIN(0, 1):      /* DB#0 */
 304                                 return IRQ_IXDP2X01_SPCI_DB_0;
 305                         case DEVPIN(1, 1):      /* DB#1 */
 306                                 return IRQ_IXDP2X01_SPCI_DB_1;
 307                         }
 308                 } else {
 309                         /* Device is located indirectly after second MB bridge */
 310                         /* Not supported now */
 311                 }
 312                 break;
 313         }
 314
 315         return -1;
 316 }
 317
 318
 319 static int ixdp2x01_pci_setup(int nr, struct pci_sys_data *sys)
 320 {
 321         sys->mem_offset = 0xe0000000;
 322
 323         if (machine_is_ixdp2801() || machine_is_ixdp28x5())
 324                 sys->mem_offset -= ((*IXP2000_PCI_ADDR_EXT & 0xE000) << 16);
 325
 326         return ixp2000_pci_setup(nr, sys);
 327 }
 328
 329 struct hw_pci ixdp2x01_pci __initdata = {
 330         .nr_controllers = 1,
 331         .setup          = ixdp2x01_pci_setup,
 332         .preinit        = ixdp2x01_pci_preinit,
 333         .scan           = ixp2000_pci_scan_bus,
 334         .map_irq        = ixdp2x01_pci_map_irq,
 335 };
 336
 337 int __init ixdp2x01_pci_init(void)
 338 {
 339         if (machine_is_ixdp2401() || machine_is_ixdp2801() ||\
 340                 machine_is_ixdp28x5())
 341                 pci_common_init(&ixdp2x01_pci);
 342
 343         return 0;
 344 }
 345
 346 subsys_initcall(ixdp2x01_pci_init);
 347
 348 /*************************************************************************
 349  * IXDP2x01 Machine Initialization
 350  *************************************************************************/
 351 static struct flash_platform_data ixdp2x01_flash_platform_data = {
 352         .map_name       = "cfi_probe",
 353         .width          = 1,
 354 };
 355
 356 static unsigned long ixdp2x01_flash_bank_setup(unsigned long ofs)
 357 {
 358         ixp2000_reg_wrb(IXDP2X01_CPLD_FLASH_REG,
 359                 ((ofs >> IXDP2X01_FLASH_WINDOW_BITS) | IXDP2X01_CPLD_FLASH_INTERN));
 360         return (ofs & IXDP2X01_FLASH_WINDOW_MASK);
 361 }
 362
 363 static struct ixp2000_flash_data ixdp2x01_flash_data = {
 364         .platform_data  = &ixdp2x01_flash_platform_data,
 365         .bank_setup     = ixdp2x01_flash_bank_setup
 366 };
 367
 368 static struct resource ixdp2x01_flash_resource = {
 369         .start          = 0xc4000000,
 370         .end            = 0xc4000000 + 0x01ffffff,
 371         .flags          = IORESOURCE_MEM,
 372 };
 373
 374 static struct platform_device ixdp2x01_flash = {
 375         .name           = "IXP2000-Flash",
 376         .id             = 0,
 377         .dev            = {
 378                 .platform_data = &ixdp2x01_flash_data,
 379         },
 380         .num_resources  = 1,
 381         .resource       = &ixdp2x01_flash_resource,
 382 };
 383
 384 static struct ixp2000_i2c_pins ixdp2x01_i2c_gpio_pins = {
 385         .sda_pin        = IXDP2X01_GPIO_SDA,
 386         .scl_pin        = IXDP2X01_GPIO_SCL,
 387 };
 388
 389 static struct platform_device ixdp2x01_i2c_controller = {
 390         .name           = "IXP2000-I2C",
 391         .id             = 0,
 392         .dev            = {
 393                 .platform_data = &ixdp2x01_i2c_gpio_pins,
 394         },
 395         .num_resources  = 0
 396 };
 397
 398 static struct platform_device *ixdp2x01_devices[] __initdata = {
 399         &ixdp2x01_flash,
 400         &ixdp2x01_i2c_controller
 401 };
 402
 403 static void __init ixdp2x01_init_machine(void)
 404 {
 405         ixp2000_reg_wrb(IXDP2X01_CPLD_FLASH_REG,
 406                 (IXDP2X01_CPLD_FLASH_BANK_MASK | IXDP2X01_CPLD_FLASH_INTERN));
 407
 408         ixdp2x01_flash_data.nr_banks =
 409                 ((*IXDP2X01_CPLD_FLASH_REG & IXDP2X01_CPLD_FLASH_BANK_MASK) + 1);
 410
 411         platform_add_devices(ixdp2x01_devices, ARRAY_SIZE(ixdp2x01_devices));
 412         ixp2000_uart_init();
 413         ixdp2x01_uart_init();
 414 }
 415
 416 static void ixdp2401_restart(char mode, const char *cmd)
 417 {
 418         /*
 419          * Reset flash banking register so that we are pointing at
 420          * RedBoot bank.
 421          */
 422         ixp2000_reg_write(IXDP2X01_CPLD_FLASH_REG,
 423                                 ((0 >> IXDP2X01_FLASH_WINDOW_BITS)
 424                                         | IXDP2X01_CPLD_FLASH_INTERN));
 425         ixp2000_reg_wrb(IXDP2X01_CPLD_RESET_REG, 0xffffffff);
 426
 427         ixp2000_restart(mode, cmd);
 428 }
 429
 430 static void ixdp280x_restart(char mode, const char *cmd)
 431 {
 432         /*
 433          * On IXDP2801 we need to write this magic sequence to the CPLD
 434          * to cause a complete reset of the CPU and all external devices
 435          * and move the flash bank register back to 0.
 436          */
 437         unsigned long reset_reg = *IXDP2X01_CPLD_RESET_REG;
 438
 439         reset_reg = 0x55AA0000 | (reset_reg & 0x0000FFFF);
 440         ixp2000_reg_write(IXDP2X01_CPLD_RESET_REG, reset_reg);
 441         ixp2000_reg_wrb(IXDP2X01_CPLD_RESET_REG, 0x80000000);
 442
 443         ixp2000_restart(mode, cmd);
 444 }
 445
 446 #ifdef CONFIG_ARCH_IXDP2401
 447 MACHINE_START(IXDP2401, "Intel IXDP2401 Development Platform")
 448         /* Maintainer: MontaVista Software, Inc. */
 449         .atag_offset    = 0x100,
 450         .map_io         = ixdp2x01_map_io,
 451         .init_irq       = ixdp2x01_init_irq,
 452         .timer          = &ixdp2x01_timer,
 453         .init_machine   = ixdp2x01_init_machine,
 454         .restart        = ixdp2401_restart,
 455 MACHINE_END
 456 #endif
 457
 458 #ifdef CONFIG_ARCH_IXDP2801
 459 MACHINE_START(IXDP2801, "Intel IXDP2801 Development Platform")
 460         /* Maintainer: MontaVista Software, Inc. */
 461         .atag_offset    = 0x100,
 462         .map_io         = ixdp2x01_map_io,
 463         .init_irq       = ixdp2x01_init_irq,
 464         .timer          = &ixdp2x01_timer,
 465         .init_machine   = ixdp2x01_init_machine,
 466         .restart        = ixdp280x_restart,
 467 MACHINE_END
 468
 469 /*
 470  * IXDP28x5 is basically an IXDP2801 with a different CPU but Intel
 471  * changed the machine ID in the bootloader
 472  */
 473 MACHINE_START(IXDP28X5, "Intel IXDP2805/2855 Development Platform")
 474         /* Maintainer: MontaVista Software, Inc. */
 475         .atag_offset    = 0x100,
 476         .map_io         = ixdp2x01_map_io,
 477         .init_irq       = ixdp2x01_init_irq,
 478         .timer          = &ixdp2x01_timer,
 479         .init_machine   = ixdp2x01_init_machine,
 480         .restart        = ixdp280x_restart,
 481 MACHINE_END
 482 #endif
 483
 484