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   1 /*
   2  * arch/arm/mach-ixp23xx/ixdp2351.c
   3  *
   4  * IXDP2351 board-specific routines
   5  *
   6  * Author: Deepak Saxena <dsaxena@plexity.net>
   7  *
   8  * Copyright 2005 (c) MontaVista Software, Inc.
   9  *
  10  * Based on 2.4 code Copyright 2004 (c) Intel Corporation
  11  *
  12  * This file is licensed under the terms of the GNU General Public
  13  * License version 2. This program is licensed "as is" without any
  14  * warranty of any kind, whether express or implied.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/sched.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/irq.h>
  23 #include <linux/serial.h>
  24 #include <linux/tty.h>
  25 #include <linux/bitops.h>
  26 #include <linux/ioport.h>
  27 #include <linux/serial.h>
  28 #include <linux/serial_8250.h>
  29 #include <linux/serial_core.h>
  30 #include <linux/device.h>
  31 #include <linux/mm.h>
  32 #include <linux/pci.h>
  33 #include <linux/mtd/physmap.h>
  34
  35 #include <asm/types.h>
  36 #include <asm/setup.h>
  37 #include <asm/memory.h>
  38 #include <asm/hardware.h>
  39 #include <asm/mach-types.h>
  40 #include <asm/system.h>
  41 #include <asm/tlbflush.h>
  42 #include <asm/pgtable.h>
  43
  44 #include <asm/mach/map.h>
  45 #include <asm/mach/irq.h>
  46 #include <asm/mach/arch.h>
  47 #include <asm/mach/irq.h>
  48 #include <asm/mach/pci.h>
  49
  50 /*
  51  * IXDP2351 Interrupt Handling
  52  */
  53 static void ixdp2351_inta_mask(unsigned int irq)
  54 {
  55         *IXDP2351_CPLD_INTA_MASK_SET_REG = IXDP2351_INTA_IRQ_MASK(irq);
  56 }
  57
  58 static void ixdp2351_inta_unmask(unsigned int irq)
  59 {
  60         *IXDP2351_CPLD_INTA_MASK_CLR_REG = IXDP2351_INTA_IRQ_MASK(irq);
  61 }
  62
  63 static void ixdp2351_inta_handler(unsigned int irq, struct irq_desc *desc)
  64 {
  65         u16 ex_interrupt =
  66                 *IXDP2351_CPLD_INTA_STAT_REG & IXDP2351_INTA_IRQ_VALID;
  67         int i;
  68
  69         desc->chip->mask(irq);
  70
  71         for (i = 0; i < IXDP2351_INTA_IRQ_NUM; i++) {
  72                 if (ex_interrupt & (1 << i)) {
  73                         struct irq_desc *cpld_desc;
  74                         int cpld_irq =
  75                                 IXP23XX_MACH_IRQ(IXDP2351_INTA_IRQ_BASE + i);
  76                         cpld_desc = irq_desc + cpld_irq;
  77                         desc_handle_irq(cpld_irq, cpld_desc);
  78                 }
  79         }
  80
  81         desc->chip->unmask(irq);
  82 }
  83
  84 static struct irq_chip ixdp2351_inta_chip = {
  85         .ack    = ixdp2351_inta_mask,
  86         .mask   = ixdp2351_inta_mask,
  87         .unmask = ixdp2351_inta_unmask
  88 };
  89
  90 static void ixdp2351_intb_mask(unsigned int irq)
  91 {
  92         *IXDP2351_CPLD_INTB_MASK_SET_REG = IXDP2351_INTB_IRQ_MASK(irq);
  93 }
  94
  95 static void ixdp2351_intb_unmask(unsigned int irq)
  96 {
  97         *IXDP2351_CPLD_INTB_MASK_CLR_REG = IXDP2351_INTB_IRQ_MASK(irq);
  98 }
  99
 100 static void ixdp2351_intb_handler(unsigned int irq, struct irq_desc *desc)
 101 {
 102         u16 ex_interrupt =
 103                 *IXDP2351_CPLD_INTB_STAT_REG & IXDP2351_INTB_IRQ_VALID;
 104         int i;
 105
 106         desc->chip->ack(irq);
 107
 108         for (i = 0; i < IXDP2351_INTB_IRQ_NUM; i++) {
 109                 if (ex_interrupt & (1 << i)) {
 110                         struct irq_desc *cpld_desc;
 111                         int cpld_irq =
 112                                 IXP23XX_MACH_IRQ(IXDP2351_INTB_IRQ_BASE + i);
 113                         cpld_desc = irq_desc + cpld_irq;
 114                         desc_handle_irq(cpld_irq, cpld_desc);
 115                 }
 116         }
 117
 118         desc->chip->unmask(irq);
 119 }
 120
 121 static struct irq_chip ixdp2351_intb_chip = {
 122         .ack    = ixdp2351_intb_mask,
 123         .mask   = ixdp2351_intb_mask,
 124         .unmask = ixdp2351_intb_unmask
 125 };
 126
 127 void ixdp2351_init_irq(void)
 128 {
 129         int irq;
 130
 131         /* Mask all interrupts from CPLD, disable simulation */
 132         *IXDP2351_CPLD_INTA_MASK_SET_REG = (u16) -1;
 133         *IXDP2351_CPLD_INTB_MASK_SET_REG = (u16) -1;
 134         *IXDP2351_CPLD_INTA_SIM_REG = 0;
 135         *IXDP2351_CPLD_INTB_SIM_REG = 0;
 136
 137         ixp23xx_init_irq();
 138
 139         for (irq = IXP23XX_MACH_IRQ(IXDP2351_INTA_IRQ_BASE);
 140              irq <
 141              IXP23XX_MACH_IRQ(IXDP2351_INTA_IRQ_BASE + IXDP2351_INTA_IRQ_NUM);
 142              irq++) {
 143                 if (IXDP2351_INTA_IRQ_MASK(irq) & IXDP2351_INTA_IRQ_VALID) {
 144                         set_irq_flags(irq, IRQF_VALID);
 145                         set_irq_handler(irq, handle_level_irq);
 146                         set_irq_chip(irq, &ixdp2351_inta_chip);
 147                 }
 148         }
 149
 150         for (irq = IXP23XX_MACH_IRQ(IXDP2351_INTB_IRQ_BASE);
 151              irq <
 152              IXP23XX_MACH_IRQ(IXDP2351_INTB_IRQ_BASE + IXDP2351_INTB_IRQ_NUM);
 153              irq++) {
 154                 if (IXDP2351_INTB_IRQ_MASK(irq) & IXDP2351_INTB_IRQ_VALID) {
 155                         set_irq_flags(irq, IRQF_VALID);
 156                         set_irq_handler(irq, handle_level_irq);
 157                         set_irq_chip(irq, &ixdp2351_intb_chip);
 158                 }
 159         }
 160
 161         set_irq_chained_handler(IRQ_IXP23XX_INTA, ixdp2351_inta_handler);
 162         set_irq_chained_handler(IRQ_IXP23XX_INTB, ixdp2351_intb_handler);
 163 }
 164
 165 /*
 166  * IXDP2351 PCI
 167  */
 168
 169 /*
 170  * This board does not do normal PCI IRQ routing, or any
 171  * sort of swizzling, so we just need to check where on the
 172  * bus the device is and figure out what CPLD pin it is
 173  * being routed to.
 174  */
 175 #define DEVPIN(dev, pin) ((pin) | ((dev) << 3))
 176
 177 static int __init ixdp2351_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 178 {
 179         u8 bus = dev->bus->number;
 180         u32 devpin = DEVPIN(PCI_SLOT(dev->devfn), pin);
 181         struct pci_bus *tmp_bus = dev->bus;
 182
 183         /* Primary bus, no interrupts here */
 184         if (!bus)
 185                 return -1;
 186
 187         /* Lookup first leaf in bus tree */
 188         while ((tmp_bus->parent != NULL) && (tmp_bus->parent->parent != NULL))
 189                 tmp_bus = tmp_bus->parent;
 190
 191         /* Select between known bridges */
 192         switch (tmp_bus->self->devfn | (tmp_bus->self->bus->number << 8)) {
 193                 /* Device is located after first bridge */
 194         case 0x0008:
 195                 if (tmp_bus == dev->bus) {
 196                         /* Device is located directy after first bridge */
 197                         switch (devpin) {
 198                                 /* Onboard 82546 */
 199                         case DEVPIN(1, 1):      /* Onboard 82546 ch 0 */
 200                                 return IRQ_IXDP2351_INTA_82546;
 201                         case DEVPIN(1, 2):      /* Onboard 82546 ch 1 */
 202                                 return IRQ_IXDP2351_INTB_82546;
 203                                 /* PMC SLOT */
 204                         case DEVPIN(0, 1):      /* PMCP INTA# */
 205                         case DEVPIN(2, 4):      /* PMCS INTD# */
 206                                 return IRQ_IXDP2351_SPCI_PMC_INTA;
 207                         case DEVPIN(0, 2):      /* PMCP INTB# */
 208                         case DEVPIN(2, 1):      /* PMCS INTA# */
 209                                 return IRQ_IXDP2351_SPCI_PMC_INTB;
 210                         case DEVPIN(0, 3):      /* PMCP INTC# */
 211                         case DEVPIN(2, 2):      /* PMCS INTB# */
 212                                 return IRQ_IXDP2351_SPCI_PMC_INTC;
 213                         case DEVPIN(0, 4):      /* PMCP INTD# */
 214                         case DEVPIN(2, 3):      /* PMCS INTC# */
 215                                 return IRQ_IXDP2351_SPCI_PMC_INTD;
 216                         }
 217                 } else {
 218                         /* Device is located indirectly after first bridge */
 219                         /* Not supported now */
 220                         return -1;
 221                 }
 222                 break;
 223         case 0x0010:
 224                 if (tmp_bus == dev->bus) {
 225                         /* Device is located directy after second bridge */
 226                         /* Secondary bus of second bridge */
 227                         switch (devpin) {
 228                         case DEVPIN(0, 1):      /* DB#0 */
 229                         case DEVPIN(0, 2):
 230                         case DEVPIN(0, 3):
 231                         case DEVPIN(0, 4):
 232                                 return IRQ_IXDP2351_SPCI_DB_0;
 233                         case DEVPIN(1, 1):      /* DB#1 */
 234                         case DEVPIN(1, 2):
 235                         case DEVPIN(1, 3):
 236                         case DEVPIN(1, 4):
 237                                 return IRQ_IXDP2351_SPCI_DB_1;
 238                         case DEVPIN(2, 1):      /* FIC1 */
 239                         case DEVPIN(2, 2):
 240                         case DEVPIN(2, 3):
 241                         case DEVPIN(2, 4):
 242                         case DEVPIN(3, 1):      /* FIC2 */
 243                         case DEVPIN(3, 2):
 244                         case DEVPIN(3, 3):
 245                         case DEVPIN(3, 4):
 246                                 return IRQ_IXDP2351_SPCI_FIC;
 247                         }
 248                 } else {
 249                         /* Device is located indirectly after second bridge */
 250                         /* Not supported now */
 251                         return -1;
 252                 }
 253                 break;
 254         }
 255
 256         return -1;
 257 }
 258
 259 struct hw_pci ixdp2351_pci __initdata = {
 260         .nr_controllers = 1,
 261         .preinit        = ixp23xx_pci_preinit,
 262         .setup          = ixp23xx_pci_setup,
 263         .scan           = ixp23xx_pci_scan_bus,
 264         .map_irq        = ixdp2351_map_irq,
 265 };
 266
 267 int __init ixdp2351_pci_init(void)
 268 {
 269         if (machine_is_ixdp2351())
 270                 pci_common_init(&ixdp2351_pci);
 271
 272         return 0;
 273 }
 274
 275 subsys_initcall(ixdp2351_pci_init);
 276
 277 /*
 278  * IXDP2351 Static Mapped I/O
 279  */
 280 static struct map_desc ixdp2351_io_desc[] __initdata = {
 281         {
 282                 .virtual        = IXDP2351_NP_VIRT_BASE,
 283                 .pfn            = __phys_to_pfn((u64)IXDP2351_NP_PHYS_BASE),
 284                 .length         = IXDP2351_NP_PHYS_SIZE,
 285                 .type           = MT_DEVICE
 286         }, {
 287                 .virtual        = IXDP2351_BB_BASE_VIRT,
 288                 .pfn            = __phys_to_pfn((u64)IXDP2351_BB_BASE_PHYS),
 289                 .length         = IXDP2351_BB_SIZE,
 290                 .type           = MT_DEVICE
 291         }
 292 };
 293
 294 static void __init ixdp2351_map_io(void)
 295 {
 296         ixp23xx_map_io();
 297         iotable_init(ixdp2351_io_desc, ARRAY_SIZE(ixdp2351_io_desc));
 298 }
 299
 300 static struct physmap_flash_data ixdp2351_flash_data = {
 301         .width          = 1,
 302 };
 303
 304 static struct resource ixdp2351_flash_resource = {
 305         .start          = 0x90000000,
 306         .end            = 0x93ffffff,
 307         .flags          = IORESOURCE_MEM,
 308 };
 309
 310 static struct platform_device ixdp2351_flash = {
 311         .name           = "physmap-flash",
 312         .id             = 0,
 313         .dev            = {
 314                 .platform_data  = &ixdp2351_flash_data,
 315         },
 316         .num_resources  = 1,
 317         .resource       = &ixdp2351_flash_resource,
 318 };
 319
 320 static void __init ixdp2351_init(void)
 321 {
 322         platform_device_register(&ixdp2351_flash);
 323
 324         /*
 325          * Mark flash as writeable
 326          */
 327         IXP23XX_EXP_CS0[0] |= IXP23XX_FLASH_WRITABLE;
 328         IXP23XX_EXP_CS0[1] |= IXP23XX_FLASH_WRITABLE;
 329         IXP23XX_EXP_CS0[2] |= IXP23XX_FLASH_WRITABLE;
 330         IXP23XX_EXP_CS0[3] |= IXP23XX_FLASH_WRITABLE;
 331
 332         ixp23xx_sys_init();
 333 }
 334
 335 MACHINE_START(IXDP2351, "Intel IXDP2351 Development Platform")
 336         /* Maintainer: MontaVista Software, Inc. */
 337         .phys_io        = IXP23XX_PERIPHERAL_PHYS,
 338         .io_pg_offst    = ((IXP23XX_PERIPHERAL_VIRT >> 18)) & 0xfffc,
 339         .map_io         = ixdp2351_map_io,
 340         .init_irq       = ixdp2351_init_irq,
 341         .timer          = &ixp23xx_timer,
 342         .boot_params    = 0x00000100,
 343         .init_machine   = ixdp2351_init,
 344 MACHINE_END