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   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/config.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/mm.h>
  22 #include <linux/sched.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/bitops.h>
  25 #include <linux/pci.h>
  26 #include <linux/ioport.h>
  27 #include <linux/slab.h>
  28 #include <linux/delay.h>
  29 #include <linux/serial.h>
  30 #include <linux/tty.h>
  31 #include <linux/serial_core.h>
  32 #include <linux/platform_device.h>
  33
  34 #include <asm/io.h>
  35 #include <asm/irq.h>
  36 #include <asm/pgtable.h>
  37 #include <asm/page.h>
  38 #include <asm/system.h>
  39 #include <asm/hardware.h>
  40 #include <asm/mach-types.h>
  41
  42 #include <asm/mach/pci.h>
  43 #include <asm/mach/map.h>
  44 #include <asm/mach/irq.h>
  45 #include <asm/mach/time.h>
  46 #include <asm/mach/arch.h>
  47 #include <asm/mach/flash.h>
  48
  49 /*************************************************************************
  50  * IXDP2x01 IRQ Handling
  51  *************************************************************************/
  52 static void ixdp2x01_irq_mask(unsigned int irq)
  53 {
  54         ixp2000_reg_wrb(IXDP2X01_INT_MASK_SET_REG,
  55                                 IXP2000_BOARD_IRQ_MASK(irq));
  56 }
  57
  58 static void ixdp2x01_irq_unmask(unsigned int irq)
  59 {
  60         ixp2000_reg_write(IXDP2X01_INT_MASK_CLR_REG,
  61                                 IXP2000_BOARD_IRQ_MASK(irq));
  62 }
  63
  64 static u32 valid_irq_mask;
  65
  66 static void ixdp2x01_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
  67 {
  68         u32 ex_interrupt;
  69         int i;
  70
  71         desc->chip->mask(irq);
  72
  73         ex_interrupt = *IXDP2X01_INT_STAT_REG & valid_irq_mask;
  74
  75         if (!ex_interrupt) {
  76                 printk(KERN_ERR "Spurious IXDP2X01 CPLD interrupt!\n");
  77                 return;
  78         }
  79
  80         for (i = 0; i < IXP2000_BOARD_IRQS; i++) {
  81                 if (ex_interrupt & (1 << i)) {
  82                         struct irqdesc *cpld_desc;
  83                         int cpld_irq = IXP2000_BOARD_IRQ(0) + i;
  84                         cpld_desc = irq_desc + cpld_irq;
  85                         desc_handle_irq(cpld_irq, cpld_desc, regs);
  86                 }
  87         }
  88
  89         desc->chip->unmask(irq);
  90 }
  91
  92 static struct irqchip ixdp2x01_irq_chip = {
  93         .mask   = ixdp2x01_irq_mask,
  94         .ack    = ixdp2x01_irq_mask,
  95         .unmask = ixdp2x01_irq_unmask
  96 };
  97
  98 /*
  99  * We only do anything if we are the master NPU on the board.
 100  * The slave NPU only has the ethernet chip going directly to
 101  * the PCIB interrupt input.
 102  */
 103 void __init ixdp2x01_init_irq(void)
 104 {
 105         int irq = 0;
 106
 107         /* initialize chip specific interrupts */
 108         ixp2000_init_irq();
 109
 110         if (machine_is_ixdp2401())
 111                 valid_irq_mask = IXDP2401_VALID_IRQ_MASK;
 112         else
 113                 valid_irq_mask = IXDP2801_VALID_IRQ_MASK;
 114
 115         /* Mask all interrupts from CPLD, disable simulation */
 116         ixp2000_reg_write(IXDP2X01_INT_MASK_SET_REG, 0xffffffff);
 117         ixp2000_reg_wrb(IXDP2X01_INT_SIM_REG, 0);
 118
 119         for (irq = NR_IXP2000_IRQS; irq < NR_IXDP2X01_IRQS; irq++) {
 120                 if (irq & valid_irq_mask) {
 121                         set_irq_chip(irq, &ixdp2x01_irq_chip);
 122                         set_irq_handler(irq, do_level_IRQ);
 123                         set_irq_flags(irq, IRQF_VALID);
 124                 } else {
 125                         set_irq_flags(irq, 0);
 126                 }
 127         }
 128
 129         /* Hook into PCI interrupts */
 130         set_irq_chained_handler(IRQ_IXP2000_PCIB, &ixdp2x01_irq_handler);
 131 }
 132
 133
 134 /*************************************************************************
 135  * IXDP2x01 memory map and serial ports
 136  *************************************************************************/
 137 static struct map_desc ixdp2x01_io_desc __initdata = {
 138         .virtual        = IXDP2X01_VIRT_CPLD_BASE,
 139         .pfn            = __phys_to_pfn(IXDP2X01_PHYS_CPLD_BASE),
 140         .length         = IXDP2X01_CPLD_REGION_SIZE,
 141         .type           = MT_DEVICE
 142 };
 143
 144 static struct uart_port ixdp2x01_serial_ports[2] = {
 145         {
 146                 .membase        = (char *)(IXDP2X01_UART1_VIRT_BASE),
 147                 .mapbase        = (unsigned long)IXDP2X01_UART1_PHYS_BASE,
 148                 .irq            = IRQ_IXDP2X01_UART1,
 149                 .flags          = UPF_SKIP_TEST,
 150                 .iotype         = UPIO_MEM32,
 151                 .regshift       = 2,
 152                 .uartclk        = IXDP2X01_UART_CLK,
 153                 .line           = 1,
 154                 .type           = PORT_16550A,
 155                 .fifosize       = 16
 156         }, {
 157                 .membase        = (char *)(IXDP2X01_UART2_VIRT_BASE),
 158                 .mapbase        = (unsigned long)IXDP2X01_UART2_PHYS_BASE,
 159                 .irq            = IRQ_IXDP2X01_UART2,
 160                 .flags          = UPF_SKIP_TEST,
 161                 .iotype         = UPIO_MEM32,
 162                 .regshift       = 2,
 163                 .uartclk        = IXDP2X01_UART_CLK,
 164                 .line           = 2,
 165                 .type           = PORT_16550A,
 166                 .fifosize       = 16
 167         },
 168 };
 169
 170 static void __init ixdp2x01_map_io(void)
 171 {
 172         ixp2000_map_io();
 173
 174         iotable_init(&ixdp2x01_io_desc, 1);
 175
 176         early_serial_setup(&ixdp2x01_serial_ports[0]);
 177         early_serial_setup(&ixdp2x01_serial_ports[1]);
 178 }
 179
 180
 181 /*************************************************************************
 182  * IXDP2x01 timer tick configuration
 183  *************************************************************************/
 184 static unsigned int ixdp2x01_clock;
 185
 186 static int __init ixdp2x01_clock_setup(char *str)
 187 {
 188         ixdp2x01_clock = simple_strtoul(str, NULL, 10);
 189
 190         return 1;
 191 }
 192
 193 __setup("ixdp2x01_clock=", ixdp2x01_clock_setup);
 194
 195 static void __init ixdp2x01_timer_init(void)
 196 {
 197         if (!ixdp2x01_clock)
 198                 ixdp2x01_clock = 50000000;
 199
 200         ixp2000_init_time(ixdp2x01_clock);
 201 }
 202
 203 static struct sys_timer ixdp2x01_timer = {
 204         .init           = ixdp2x01_timer_init,
 205         .offset         = ixp2000_gettimeoffset,
 206 };
 207
 208 /*************************************************************************
 209  * IXDP2x01 PCI
 210  *************************************************************************/
 211 void __init ixdp2x01_pci_preinit(void)
 212 {
 213         ixp2000_reg_write(IXP2000_PCI_ADDR_EXT, 0x00000000);
 214         ixp2000_pci_preinit();
 215 }
 216
 217 #define DEVPIN(dev, pin) ((pin) | ((dev) << 3))
 218
 219 static int __init ixdp2x01_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 220 {
 221         u8 bus = dev->bus->number;
 222         u32 devpin = DEVPIN(PCI_SLOT(dev->devfn), pin);
 223         struct pci_bus *tmp_bus = dev->bus;
 224
 225         /* Primary bus, no interrupts here */
 226         if (bus == 0) {
 227                 return -1;
 228         }
 229
 230         /* Lookup first leaf in bus tree */
 231         while ((tmp_bus->parent != NULL) && (tmp_bus->parent->parent != NULL)) {
 232                 tmp_bus = tmp_bus->parent;
 233         }
 234
 235         /* Select between known bridges */
 236         switch (tmp_bus->self->devfn | (tmp_bus->self->bus->number << 8)) {
 237         /* Device is located after first MB bridge */
 238         case 0x0008:
 239                 if (tmp_bus == dev->bus) {
 240                         /* Device is located directy after first MB bridge */
 241                         switch (devpin) {
 242                         case DEVPIN(1, 1):      /* Onboard 82546 ch 0 */
 243                                 if (machine_is_ixdp2401())
 244                                         return IRQ_IXDP2401_INTA_82546;
 245                                 return -1;
 246                         case DEVPIN(1, 2):      /* Onboard 82546 ch 1 */
 247                                 if (machine_is_ixdp2401())
 248                                         return IRQ_IXDP2401_INTB_82546;
 249                                 return -1;
 250                         case DEVPIN(0, 1):      /* PMC INTA# */
 251                                 return IRQ_IXDP2X01_SPCI_PMC_INTA;
 252                         case DEVPIN(0, 2):      /* PMC INTB# */
 253                                 return IRQ_IXDP2X01_SPCI_PMC_INTB;
 254                         case DEVPIN(0, 3):      /* PMC INTC# */
 255                                 return IRQ_IXDP2X01_SPCI_PMC_INTC;
 256                         case DEVPIN(0, 4):      /* PMC INTD# */
 257                                 return IRQ_IXDP2X01_SPCI_PMC_INTD;
 258                         }
 259                 }
 260                 break;
 261         case 0x0010:
 262                 if (tmp_bus == dev->bus) {
 263                         /* Device is located directy after second MB bridge */
 264                         /* Secondary bus of second bridge */
 265                         switch (devpin) {
 266                         case DEVPIN(0, 1):      /* DB#0 */
 267                                 return IRQ_IXDP2X01_SPCI_DB_0;
 268                         case DEVPIN(1, 1):      /* DB#1 */
 269                                 return IRQ_IXDP2X01_SPCI_DB_1;
 270                         }
 271                 } else {
 272                         /* Device is located indirectly after second MB bridge */
 273                         /* Not supported now */
 274                 }
 275                 break;
 276         }
 277
 278         return -1;
 279 }
 280
 281
 282 static int ixdp2x01_pci_setup(int nr, struct pci_sys_data *sys)
 283 {
 284         sys->mem_offset = 0xe0000000;
 285
 286         if (machine_is_ixdp2801())
 287                 sys->mem_offset -= ((*IXP2000_PCI_ADDR_EXT & 0xE000) << 16);
 288
 289         return ixp2000_pci_setup(nr, sys);
 290 }
 291
 292 struct hw_pci ixdp2x01_pci __initdata = {
 293         .nr_controllers = 1,
 294         .setup          = ixdp2x01_pci_setup,
 295         .preinit        = ixdp2x01_pci_preinit,
 296         .scan           = ixp2000_pci_scan_bus,
 297         .map_irq        = ixdp2x01_pci_map_irq,
 298 };
 299
 300 int __init ixdp2x01_pci_init(void)
 301 {
 302         pci_common_init(&ixdp2x01_pci);
 303         return 0;
 304 }
 305
 306 subsys_initcall(ixdp2x01_pci_init);
 307
 308 /*************************************************************************
 309  * IXDP2x01 Machine Intialization
 310  *************************************************************************/
 311 static struct flash_platform_data ixdp2x01_flash_platform_data = {
 312         .map_name       = "cfi_probe",
 313         .width          = 1,
 314 };
 315
 316 static unsigned long ixdp2x01_flash_bank_setup(unsigned long ofs)
 317 {
 318         ixp2000_reg_wrb(IXDP2X01_CPLD_FLASH_REG,
 319                 ((ofs >> IXDP2X01_FLASH_WINDOW_BITS) | IXDP2X01_CPLD_FLASH_INTERN));
 320         return (ofs & IXDP2X01_FLASH_WINDOW_MASK);
 321 }
 322
 323 static struct ixp2000_flash_data ixdp2x01_flash_data = {
 324         .platform_data  = &ixdp2x01_flash_platform_data,
 325         .bank_setup     = ixdp2x01_flash_bank_setup
 326 };
 327
 328 static struct resource ixdp2x01_flash_resource = {
 329         .start          = 0xc4000000,
 330         .end            = 0xc4000000 + 0x01ffffff,
 331         .flags          = IORESOURCE_MEM,
 332 };
 333
 334 static struct platform_device ixdp2x01_flash = {
 335         .name           = "IXP2000-Flash",
 336         .id             = 0,
 337         .dev            = {
 338                 .platform_data = &ixdp2x01_flash_data,
 339         },
 340         .num_resources  = 1,
 341         .resource       = &ixdp2x01_flash_resource,
 342 };
 343
 344 static struct ixp2000_i2c_pins ixdp2x01_i2c_gpio_pins = {
 345         .sda_pin        = IXDP2X01_GPIO_SDA,
 346         .scl_pin        = IXDP2X01_GPIO_SCL,
 347 };
 348
 349 static struct platform_device ixdp2x01_i2c_controller = {
 350         .name           = "IXP2000-I2C",
 351         .id             = 0,
 352         .dev            = {
 353                 .platform_data = &ixdp2x01_i2c_gpio_pins,
 354         },
 355         .num_resources  = 0
 356 };
 357
 358 static struct platform_device *ixdp2x01_devices[] __initdata = {
 359         &ixdp2x01_flash,
 360         &ixdp2x01_i2c_controller
 361 };
 362
 363 static void __init ixdp2x01_init_machine(void)
 364 {
 365         ixp2000_reg_wrb(IXDP2X01_CPLD_FLASH_REG,
 366                 (IXDP2X01_CPLD_FLASH_BANK_MASK | IXDP2X01_CPLD_FLASH_INTERN));
 367
 368         ixdp2x01_flash_data.nr_banks =
 369                 ((*IXDP2X01_CPLD_FLASH_REG & IXDP2X01_CPLD_FLASH_BANK_MASK) + 1);
 370
 371         platform_add_devices(ixdp2x01_devices, ARRAY_SIZE(ixdp2x01_devices));
 372         ixp2000_uart_init();
 373 }
 374
 375
 376 #ifdef CONFIG_ARCH_IXDP2401
 377 MACHINE_START(IXDP2401, "Intel IXDP2401 Development Platform")
 378         /* Maintainer: MontaVista Software, Inc. */
 379         .phys_ram       = 0x00000000,
 380         .phys_io        = IXP2000_UART_PHYS_BASE,
 381         .io_pg_offst    = ((IXP2000_UART_VIRT_BASE) >> 18) & 0xfffc,
 382         .boot_params    = 0x00000100,
 383         .map_io         = ixdp2x01_map_io,
 384         .init_irq       = ixdp2x01_init_irq,
 385         .timer          = &ixdp2x01_timer,
 386         .init_machine   = ixdp2x01_init_machine,
 387 MACHINE_END
 388 #endif
 389
 390 #ifdef CONFIG_ARCH_IXDP2801
 391 MACHINE_START(IXDP2801, "Intel IXDP2801 Development Platform")
 392         /* Maintainer: MontaVista Software, Inc. */
 393         .phys_ram       = 0x00000000,
 394         .phys_io        = IXP2000_UART_PHYS_BASE,
 395         .io_pg_offst    = ((IXP2000_UART_VIRT_BASE) >> 18) & 0xfffc,
 396         .boot_params    = 0x00000100,
 397         .map_io         = ixdp2x01_map_io,
 398         .init_irq       = ixdp2x01_init_irq,
 399         .timer          = &ixdp2x01_timer,
 400         .init_machine   = ixdp2x01_init_machine,
 401 MACHINE_END
 402 #endif
 403
 404