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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/config.h>
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/sched.h>
  22 #include <linux/interrupt.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/irq.h>
  41 #include <asm/system.h>
  42 #include <asm/tlbflush.h>
  43 #include <asm/pgtable.h>
  44
  45 #include <asm/mach/map.h>
  46 #include <asm/mach/irq.h>
  47 #include <asm/mach/arch.h>
  48 #include <asm/mach/irq.h>
  49 #include <asm/mach/pci.h>
  50
  51 /*
  52  * IXDP2351 Interrupt Handling
  53  */
  54 static void ixdp2351_inta_mask(unsigned int irq)
  55 {
  56         *IXDP2351_CPLD_INTA_MASK_SET_REG = IXDP2351_INTA_IRQ_MASK(irq);
  57 }
  58
  59 static void ixdp2351_inta_unmask(unsigned int irq)
  60 {
  61         *IXDP2351_CPLD_INTA_MASK_CLR_REG = IXDP2351_INTA_IRQ_MASK(irq);
  62 }
  63
  64 static void ixdp2351_inta_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
  65 {
  66         u16 ex_interrupt =
  67                 *IXDP2351_CPLD_INTA_STAT_REG & IXDP2351_INTA_IRQ_VALID;
  68         int i;
  69
  70         desc->chip->mask(irq);
  71
  72         for (i = 0; i < IXDP2351_INTA_IRQ_NUM; i++) {
  73                 if (ex_interrupt & (1 << i)) {
  74                         struct irqdesc *cpld_desc;
  75                         int cpld_irq =
  76                                 IXP23XX_MACH_IRQ(IXDP2351_INTA_IRQ_BASE + i);
  77                         cpld_desc = irq_desc + cpld_irq;
  78                         cpld_desc->handle(cpld_irq, cpld_desc, regs);
  79                 }
  80         }
  81
  82         desc->chip->unmask(irq);
  83 }
  84
  85 static struct irqchip ixdp2351_inta_chip = {
  86         .ack    = ixdp2351_inta_mask,
  87         .mask   = ixdp2351_inta_mask,
  88         .unmask = ixdp2351_inta_unmask
  89 };
  90
  91 static void ixdp2351_intb_mask(unsigned int irq)
  92 {
  93         *IXDP2351_CPLD_INTB_MASK_SET_REG = IXDP2351_INTB_IRQ_MASK(irq);
  94 }
  95
  96 static void ixdp2351_intb_unmask(unsigned int irq)
  97 {
  98         *IXDP2351_CPLD_INTB_MASK_CLR_REG = IXDP2351_INTB_IRQ_MASK(irq);
  99 }
 100
 101 static void ixdp2351_intb_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
 102 {
 103         u16 ex_interrupt =
 104                 *IXDP2351_CPLD_INTB_STAT_REG & IXDP2351_INTB_IRQ_VALID;
 105         int i;
 106
 107         desc->chip->ack(irq);
 108
 109         for (i = 0; i < IXDP2351_INTB_IRQ_NUM; i++) {
 110                 if (ex_interrupt & (1 << i)) {
 111                         struct irqdesc *cpld_desc;
 112                         int cpld_irq =
 113                                 IXP23XX_MACH_IRQ(IXDP2351_INTB_IRQ_BASE + i);
 114                         cpld_desc = irq_desc + cpld_irq;
 115                         cpld_desc->handle(cpld_irq, cpld_desc, regs);
 116                 }
 117         }
 118
 119         desc->chip->unmask(irq);
 120 }
 121
 122 static struct irqchip ixdp2351_intb_chip = {
 123         .ack    = ixdp2351_intb_mask,
 124         .mask   = ixdp2351_intb_mask,
 125         .unmask = ixdp2351_intb_unmask
 126 };
 127
 128 void ixdp2351_init_irq(void)
 129 {
 130         int irq;
 131
 132         /* Mask all interrupts from CPLD, disable simulation */
 133         *IXDP2351_CPLD_INTA_MASK_SET_REG = (u16) -1;
 134         *IXDP2351_CPLD_INTB_MASK_SET_REG = (u16) -1;
 135         *IXDP2351_CPLD_INTA_SIM_REG = 0;
 136         *IXDP2351_CPLD_INTB_SIM_REG = 0;
 137
 138         ixp23xx_init_irq();
 139
 140         for (irq = IXP23XX_MACH_IRQ(IXDP2351_INTA_IRQ_BASE);
 141              irq <
 142              IXP23XX_MACH_IRQ(IXDP2351_INTA_IRQ_BASE + IXDP2351_INTA_IRQ_NUM);
 143              irq++) {
 144                 if (IXDP2351_INTA_IRQ_MASK(irq) & IXDP2351_INTA_IRQ_VALID) {
 145                         set_irq_flags(irq, IRQF_VALID);
 146                         set_irq_handler(irq, do_level_IRQ);
 147                         set_irq_chip(irq, &ixdp2351_inta_chip);
 148                 }
 149         }
 150
 151         for (irq = IXP23XX_MACH_IRQ(IXDP2351_INTB_IRQ_BASE);
 152              irq <
 153              IXP23XX_MACH_IRQ(IXDP2351_INTB_IRQ_BASE + IXDP2351_INTB_IRQ_NUM);
 154              irq++) {
 155                 if (IXDP2351_INTB_IRQ_MASK(irq) & IXDP2351_INTB_IRQ_VALID) {
 156                         set_irq_flags(irq, IRQF_VALID);
 157                         set_irq_handler(irq, do_level_IRQ);
 158                         set_irq_chip(irq, &ixdp2351_intb_chip);
 159                 }
 160         }
 161
 162         set_irq_chained_handler(IRQ_IXP23XX_INTA, &ixdp2351_inta_handler);
 163         set_irq_chained_handler(IRQ_IXP23XX_INTB, &ixdp2351_intb_handler);
 164 }
 165
 166 /*
 167  * IXDP2351 PCI
 168  */
 169
 170 /*
 171  * This board does not do normal PCI IRQ routing, or any
 172  * sort of swizzling, so we just need to check where on the
 173  * bus the device is and figure out what CPLD pin it is
 174  * being routed to.
 175  */
 176 #define DEVPIN(dev, pin) ((pin) | ((dev) << 3))
 177
 178 static int __init ixdp2351_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 179 {
 180         u8 bus = dev->bus->number;
 181         u32 devpin = DEVPIN(PCI_SLOT(dev->devfn), pin);
 182         struct pci_bus *tmp_bus = dev->bus;
 183
 184         /* Primary bus, no interrupts here */
 185         if (!bus)
 186                 return -1;
 187
 188         /* Lookup first leaf in bus tree */
 189         while ((tmp_bus->parent != NULL) && (tmp_bus->parent->parent != NULL))
 190                 tmp_bus = tmp_bus->parent;
 191
 192         /* Select between known bridges */
 193         switch (tmp_bus->self->devfn | (tmp_bus->self->bus->number << 8)) {
 194                 /* Device is located after first bridge */
 195         case 0x0008:
 196                 if (tmp_bus == dev->bus) {
 197                         /* Device is located directy after first bridge */
 198                         switch (devpin) {
 199                                 /* Onboard 82546 */
 200                         case DEVPIN(1, 1):      /* Onboard 82546 ch 0 */
 201                                 return IRQ_IXDP2351_INTA_82546;
 202                         case DEVPIN(1, 2):      /* Onboard 82546 ch 1 */
 203                                 return IRQ_IXDP2351_INTB_82546;
 204                                 /* PMC SLOT */
 205                         case DEVPIN(0, 1):      /* PMCP INTA# */
 206                         case DEVPIN(2, 4):      /* PMCS INTD# */
 207                                 return IRQ_IXDP2351_SPCI_PMC_INTA;
 208                         case DEVPIN(0, 2):      /* PMCP INTB# */
 209                         case DEVPIN(2, 1):      /* PMCS INTA# */
 210                                 return IRQ_IXDP2351_SPCI_PMC_INTB;
 211                         case DEVPIN(0, 3):      /* PMCP INTC# */
 212                         case DEVPIN(2, 2):      /* PMCS INTB# */
 213                                 return IRQ_IXDP2351_SPCI_PMC_INTC;
 214                         case DEVPIN(0, 4):      /* PMCP INTD# */
 215                         case DEVPIN(2, 3):      /* PMCS INTC# */
 216                                 return IRQ_IXDP2351_SPCI_PMC_INTD;
 217                         }
 218                 } else {
 219                         /* Device is located indirectly after first bridge */
 220                         /* Not supported now */
 221                         return -1;
 222                 }
 223                 break;
 224         case 0x0010:
 225                 if (tmp_bus == dev->bus) {
 226                         /* Device is located directy after second bridge */
 227                         /* Secondary bus of second bridge */
 228                         switch (devpin) {
 229                         case DEVPIN(0, 1):      /* DB#0 */
 230                         case DEVPIN(0, 2):
 231                         case DEVPIN(0, 3):
 232                         case DEVPIN(0, 4):
 233                                 return IRQ_IXDP2351_SPCI_DB_0;
 234                         case DEVPIN(1, 1):      /* DB#1 */
 235                         case DEVPIN(1, 2):
 236                         case DEVPIN(1, 3):
 237                         case DEVPIN(1, 4):
 238                                 return IRQ_IXDP2351_SPCI_DB_1;
 239                         case DEVPIN(2, 1):      /* FIC1 */
 240                         case DEVPIN(2, 2):
 241                         case DEVPIN(2, 3):
 242                         case DEVPIN(2, 4):
 243                         case DEVPIN(3, 1):      /* FIC2 */
 244                         case DEVPIN(3, 2):
 245                         case DEVPIN(3, 3):
 246                         case DEVPIN(3, 4):
 247                                 return IRQ_IXDP2351_SPCI_FIC;
 248                         }
 249                 } else {
 250                         /* Device is located indirectly after second bridge */
 251                         /* Not supported now */
 252                         return -1;
 253                 }
 254                 break;
 255         }
 256
 257         return -1;
 258 }
 259
 260 struct hw_pci ixdp2351_pci __initdata = {
 261         .nr_controllers = 1,
 262         .preinit        = ixp23xx_pci_preinit,
 263         .setup          = ixp23xx_pci_setup,
 264         .scan           = ixp23xx_pci_scan_bus,
 265         .map_irq        = ixdp2351_map_irq,
 266 };
 267
 268 int __init ixdp2351_pci_init(void)
 269 {
 270         if (machine_is_ixdp2351())
 271                 pci_common_init(&ixdp2351_pci);
 272
 273         return 0;
 274 }
 275
 276 subsys_initcall(ixdp2351_pci_init);
 277
 278 /*
 279  * IXDP2351 Static Mapped I/O
 280  */
 281 static struct map_desc ixdp2351_io_desc[] __initdata = {
 282         {
 283                 .virtual        = IXDP2351_NP_VIRT_BASE,
 284                 .pfn            = __phys_to_pfn((u64)IXDP2351_NP_PHYS_BASE),
 285                 .length         = IXDP2351_NP_PHYS_SIZE,
 286                 .type           = MT_DEVICE
 287         }, {
 288                 .virtual        = IXDP2351_BB_BASE_VIRT,
 289                 .pfn            = __phys_to_pfn((u64)IXDP2351_BB_BASE_PHYS),
 290                 .length         = IXDP2351_BB_SIZE,
 291                 .type           = MT_DEVICE
 292         }
 293 };
 294
 295 static void __init ixdp2351_map_io(void)
 296 {
 297         ixp23xx_map_io();
 298         iotable_init(ixdp2351_io_desc, ARRAY_SIZE(ixdp2351_io_desc));
 299 }
 300
 301 static void __init ixdp2351_init(void)
 302 {
 303         physmap_configure(0x90000000, 0x04000000, 1, NULL);
 304
 305         /*
 306          * Mark flash as writeable
 307          */
 308         IXP23XX_EXP_CS0[0] |= IXP23XX_FLASH_WRITABLE;
 309         IXP23XX_EXP_CS0[1] |= IXP23XX_FLASH_WRITABLE;
 310         IXP23XX_EXP_CS0[2] |= IXP23XX_FLASH_WRITABLE;
 311         IXP23XX_EXP_CS0[3] |= IXP23XX_FLASH_WRITABLE;
 312
 313         ixp23xx_sys_init();
 314 }
 315
 316 MACHINE_START(IXDP2351, "Intel IXDP2351 Development Platform")
 317         /* Maintainer: MontaVista Software, Inc. */
 318         .phys_io        = IXP23XX_PERIPHERAL_PHYS,
 319         .io_pg_offst    = ((IXP23XX_PERIPHERAL_VIRT >> 18)) & 0xfffc,
 320         .map_io         = ixdp2351_map_io,
 321         .init_irq       = ixdp2351_init_irq,
 322         .timer          = &ixp23xx_timer,
 323         .boot_params    = 0x00000100,
 324         .init_machine   = ixdp2351_init,
 325 MACHINE_END