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ixdp2x01.c

/*
 * arch/arm/mach-ixp2000/ixdp2x01.c
 *
 * Code common to Intel IXDP2401 and IXDP2801 platforms
 *
 * Original Author: Andrzej Mialkowski <andrzej.mialkowski@intel.com>
 * Maintainer: Deepak Saxena <dsaxena@plexity.net>
 *
 * Copyright (C) 2002-2003 Intel Corp.
 * Copyright (C) 2003-2004 MontaVista Software, Inc.
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/serial_core.h>
#include <linux/platform_device.h>
#include <linux/serial_8250.h>
#include <linux/io.h>

#include <asm/irq.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/system.h>
#include <mach/hardware.h>
#include <asm/mach-types.h>

#include <asm/mach/pci.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
#include <asm/mach/arch.h>
#include <asm/mach/flash.h>

/*************************************************************************
 * IXDP2x01 IRQ Handling
 *************************************************************************/
static void ixdp2x01_irq_mask(unsigned int irq)
{
      ixp2000_reg_wrb(IXDP2X01_INT_MASK_SET_REG,
                        IXP2000_BOARD_IRQ_MASK(irq));
}

static void ixdp2x01_irq_unmask(unsigned int irq)
{
      ixp2000_reg_write(IXDP2X01_INT_MASK_CLR_REG,
                        IXP2000_BOARD_IRQ_MASK(irq));
}

static u32 valid_irq_mask;

static void ixdp2x01_irq_handler(unsigned int irq, struct irq_desc *desc)
{
      u32 ex_interrupt;
      int i;

      desc->chip->mask(irq);

      ex_interrupt = *IXDP2X01_INT_STAT_REG & valid_irq_mask;

      if (!ex_interrupt) {
            printk(KERN_ERR "Spurious IXDP2X01 CPLD interrupt!\n");
            return;
      }

      for (i = 0; i < IXP2000_BOARD_IRQS; i++) {
            if (ex_interrupt & (1 << i)) {
                  int cpld_irq = IXP2000_BOARD_IRQ(0) + i;
                  generic_handle_irq(cpld_irq);
            }
      }

      desc->chip->unmask(irq);
}

static struct irq_chip ixdp2x01_irq_chip = {
      .mask = ixdp2x01_irq_mask,
      .ack  = ixdp2x01_irq_mask,
      .unmask     = ixdp2x01_irq_unmask
};

/*
 * We only do anything if we are the master NPU on the board.
 * The slave NPU only has the ethernet chip going directly to
 * the PCIB interrupt input.
 */
void __init ixdp2x01_init_irq(void)
{
      int irq = 0;

      /* initialize chip specific interrupts */
      ixp2000_init_irq();

      if (machine_is_ixdp2401())
            valid_irq_mask = IXDP2401_VALID_IRQ_MASK;
      else
            valid_irq_mask = IXDP2801_VALID_IRQ_MASK;

      /* Mask all interrupts from CPLD, disable simulation */
      ixp2000_reg_write(IXDP2X01_INT_MASK_SET_REG, 0xffffffff);
      ixp2000_reg_wrb(IXDP2X01_INT_SIM_REG, 0);

      for (irq = NR_IXP2000_IRQS; irq < NR_IXDP2X01_IRQS; irq++) {
            if (irq & valid_irq_mask) {
                  set_irq_chip(irq, &ixdp2x01_irq_chip);
                  set_irq_handler(irq, handle_level_irq);
                  set_irq_flags(irq, IRQF_VALID);
            } else {
                  set_irq_flags(irq, 0);
            }
      }

      /* Hook into PCI interrupts */
      set_irq_chained_handler(IRQ_IXP2000_PCIB, ixdp2x01_irq_handler);
}


/*************************************************************************
 * IXDP2x01 memory map
 *************************************************************************/
static struct map_desc ixdp2x01_io_desc __initdata = {
      .virtual    = IXDP2X01_VIRT_CPLD_BASE, 
      .pfn        = __phys_to_pfn(IXDP2X01_PHYS_CPLD_BASE),
      .length           = IXDP2X01_CPLD_REGION_SIZE,
      .type       = MT_DEVICE
};

static void __init ixdp2x01_map_io(void)
{
      ixp2000_map_io();
      iotable_init(&ixdp2x01_io_desc, 1);
}


/*************************************************************************
 * IXDP2x01 serial ports
 *************************************************************************/
static struct plat_serial8250_port ixdp2x01_serial_port1[] = {
      {
            .mapbase    = (unsigned long)IXDP2X01_UART1_PHYS_BASE,
            .membase    = (char *)IXDP2X01_UART1_VIRT_BASE,
            .irq        = IRQ_IXDP2X01_UART1,
            .flags            = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
            .iotype           = UPIO_MEM32,
            .regshift   = 2,
            .uartclk    = IXDP2X01_UART_CLK,
      },
      { }
};

static struct resource ixdp2x01_uart_resource1 = {
      .start            = IXDP2X01_UART1_PHYS_BASE,
      .end        = IXDP2X01_UART1_PHYS_BASE + 0xffff,
      .flags            = IORESOURCE_MEM,
};

static struct platform_device ixdp2x01_serial_device1 = {
      .name       = "serial8250",
      .id         = PLAT8250_DEV_PLATFORM1,
      .dev        = {
            .platform_data          = ixdp2x01_serial_port1,
      },
      .num_resources    = 1,
      .resource   = &ixdp2x01_uart_resource1,
};

static struct plat_serial8250_port ixdp2x01_serial_port2[] = {
      {
            .mapbase    = (unsigned long)IXDP2X01_UART2_PHYS_BASE,
            .membase    = (char *)IXDP2X01_UART2_VIRT_BASE,
            .irq        = IRQ_IXDP2X01_UART2,
            .flags            = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
            .iotype           = UPIO_MEM32,
            .regshift   = 2,
            .uartclk    = IXDP2X01_UART_CLK,
      }, 
      { }
};

static struct resource ixdp2x01_uart_resource2 = {
      .start            = IXDP2X01_UART2_PHYS_BASE,
      .end        = IXDP2X01_UART2_PHYS_BASE + 0xffff,
      .flags            = IORESOURCE_MEM,
};

static struct platform_device ixdp2x01_serial_device2 = {
      .name       = "serial8250",
      .id         = PLAT8250_DEV_PLATFORM2,
      .dev        = {
            .platform_data          = ixdp2x01_serial_port2,
      },
      .num_resources    = 1,
      .resource   = &ixdp2x01_uart_resource2,
};

static void ixdp2x01_uart_init(void)
{
      platform_device_register(&ixdp2x01_serial_device1);
      platform_device_register(&ixdp2x01_serial_device2);
}


/*************************************************************************
 * IXDP2x01 timer tick configuration
 *************************************************************************/
static unsigned int ixdp2x01_clock;

static int __init ixdp2x01_clock_setup(char *str)
{
      ixdp2x01_clock = simple_strtoul(str, NULL, 10);

      return 1;
}

__setup("ixdp2x01_clock=", ixdp2x01_clock_setup);

static void __init ixdp2x01_timer_init(void)
{
      if (!ixdp2x01_clock)
            ixdp2x01_clock = 50000000;

      ixp2000_init_time(ixdp2x01_clock);
}

static struct sys_timer ixdp2x01_timer = {
      .init       = ixdp2x01_timer_init,
      .offset           = ixp2000_gettimeoffset,
};

/*************************************************************************
 * IXDP2x01 PCI
 *************************************************************************/
void __init ixdp2x01_pci_preinit(void)
{
      ixp2000_reg_write(IXP2000_PCI_ADDR_EXT, 0x00000000);
      ixp2000_pci_preinit();
      pcibios_setup("firmware");
}

#define DEVPIN(dev, pin) ((pin) | ((dev) << 3))

static int __init ixdp2x01_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
      u8 bus = dev->bus->number;
      u32 devpin = DEVPIN(PCI_SLOT(dev->devfn), pin);
      struct pci_bus *tmp_bus = dev->bus;

      /* Primary bus, no interrupts here */
      if (bus == 0) {
            return -1;
      }

      /* Lookup first leaf in bus tree */
      while ((tmp_bus->parent != NULL) && (tmp_bus->parent->parent != NULL)) {
            tmp_bus = tmp_bus->parent;
      }

      /* Select between known bridges */
      switch (tmp_bus->self->devfn | (tmp_bus->self->bus->number << 8)) {
      /* Device is located after first MB bridge */
      case 0x0008:
            if (tmp_bus == dev->bus) {
                  /* Device is located directly after first MB bridge */
                  switch (devpin) {
                  case DEVPIN(1, 1):      /* Onboard 82546 ch 0 */
                        if (machine_is_ixdp2401())
                              return IRQ_IXDP2401_INTA_82546;
                        return -1;
                  case DEVPIN(1, 2):      /* Onboard 82546 ch 1 */
                        if (machine_is_ixdp2401())
                              return IRQ_IXDP2401_INTB_82546;
                        return -1;
                  case DEVPIN(0, 1):      /* PMC INTA# */
                        return IRQ_IXDP2X01_SPCI_PMC_INTA;
                  case DEVPIN(0, 2):      /* PMC INTB# */
                        return IRQ_IXDP2X01_SPCI_PMC_INTB;
                  case DEVPIN(0, 3):      /* PMC INTC# */
                        return IRQ_IXDP2X01_SPCI_PMC_INTC;
                  case DEVPIN(0, 4):      /* PMC INTD# */
                        return IRQ_IXDP2X01_SPCI_PMC_INTD;
                  }
            }
            break;
      case 0x0010:
            if (tmp_bus == dev->bus) {
                  /* Device is located directly after second MB bridge */
                  /* Secondary bus of second bridge */
                  switch (devpin) {
                  case DEVPIN(0, 1):      /* DB#0 */
                        return IRQ_IXDP2X01_SPCI_DB_0;
                  case DEVPIN(1, 1):      /* DB#1 */
                        return IRQ_IXDP2X01_SPCI_DB_1;
                  }
            } else {
                  /* Device is located indirectly after second MB bridge */
                  /* Not supported now */
            }
            break;
      }

      return -1;
}


static int ixdp2x01_pci_setup(int nr, struct pci_sys_data *sys)
{
      sys->mem_offset = 0xe0000000;

      if (machine_is_ixdp2801() || machine_is_ixdp28x5())
            sys->mem_offset -= ((*IXP2000_PCI_ADDR_EXT & 0xE000) << 16);

      return ixp2000_pci_setup(nr, sys);
}

struct hw_pci ixdp2x01_pci __initdata = {
      .nr_controllers   = 1,
      .setup            = ixdp2x01_pci_setup,
      .preinit    = ixdp2x01_pci_preinit,
      .scan       = ixp2000_pci_scan_bus,
      .map_irq    = ixdp2x01_pci_map_irq,
};

int __init ixdp2x01_pci_init(void)
{
      if (machine_is_ixdp2401() || machine_is_ixdp2801() ||\
            machine_is_ixdp28x5())
            pci_common_init(&ixdp2x01_pci);

      return 0;
}

subsys_initcall(ixdp2x01_pci_init);

/*************************************************************************
 * IXDP2x01 Machine Initialization
 *************************************************************************/
static struct flash_platform_data ixdp2x01_flash_platform_data = {
      .map_name   = "cfi_probe",
      .width            = 1,
};

static unsigned long ixdp2x01_flash_bank_setup(unsigned long ofs)
{
      ixp2000_reg_wrb(IXDP2X01_CPLD_FLASH_REG,
            ((ofs >> IXDP2X01_FLASH_WINDOW_BITS) | IXDP2X01_CPLD_FLASH_INTERN));
      return (ofs & IXDP2X01_FLASH_WINDOW_MASK);
}

static struct ixp2000_flash_data ixdp2x01_flash_data = {
      .platform_data    = &ixdp2x01_flash_platform_data,
      .bank_setup = ixdp2x01_flash_bank_setup
};

static struct resource ixdp2x01_flash_resource = {
      .start            = 0xc4000000,
      .end        = 0xc4000000 + 0x01ffffff,
      .flags            = IORESOURCE_MEM,
};

static struct platform_device ixdp2x01_flash = {
      .name       = "IXP2000-Flash",
      .id         = 0,
      .dev        = {
            .platform_data = &ixdp2x01_flash_data,
      },
      .num_resources    = 1,
      .resource   = &ixdp2x01_flash_resource,
};

static struct ixp2000_i2c_pins ixdp2x01_i2c_gpio_pins = {
      .sda_pin    = IXDP2X01_GPIO_SDA,
      .scl_pin    = IXDP2X01_GPIO_SCL,
};

static struct platform_device ixdp2x01_i2c_controller = {
      .name       = "IXP2000-I2C",
      .id         = 0,
      .dev        = {
            .platform_data = &ixdp2x01_i2c_gpio_pins,
      },
      .num_resources    = 0
};

static struct platform_device *ixdp2x01_devices[] __initdata = {
      &ixdp2x01_flash,
      &ixdp2x01_i2c_controller
};

static void __init ixdp2x01_init_machine(void)
{
      ixp2000_reg_wrb(IXDP2X01_CPLD_FLASH_REG,
            (IXDP2X01_CPLD_FLASH_BANK_MASK | IXDP2X01_CPLD_FLASH_INTERN));
      
      ixdp2x01_flash_data.nr_banks =
            ((*IXDP2X01_CPLD_FLASH_REG & IXDP2X01_CPLD_FLASH_BANK_MASK) + 1);

      platform_add_devices(ixdp2x01_devices, ARRAY_SIZE(ixdp2x01_devices));
      ixp2000_uart_init();
      ixdp2x01_uart_init();
}


#ifdef CONFIG_ARCH_IXDP2401
MACHINE_START(IXDP2401, "Intel IXDP2401 Development Platform")
      /* Maintainer: MontaVista Software, Inc. */
      .phys_io    = IXP2000_UART_PHYS_BASE,
      .io_pg_offst      = ((IXP2000_UART_VIRT_BASE) >> 18) & 0xfffc,
      .boot_params      = 0x00000100,
      .map_io           = ixdp2x01_map_io,
      .init_irq   = ixdp2x01_init_irq,
      .timer            = &ixdp2x01_timer,
      .init_machine     = ixdp2x01_init_machine,
MACHINE_END
#endif

#ifdef CONFIG_ARCH_IXDP2801
MACHINE_START(IXDP2801, "Intel IXDP2801 Development Platform")
      /* Maintainer: MontaVista Software, Inc. */
      .phys_io    = IXP2000_UART_PHYS_BASE,
      .io_pg_offst      = ((IXP2000_UART_VIRT_BASE) >> 18) & 0xfffc,
      .boot_params      = 0x00000100,
      .map_io           = ixdp2x01_map_io,
      .init_irq   = ixdp2x01_init_irq,
      .timer            = &ixdp2x01_timer,
      .init_machine     = ixdp2x01_init_machine,
MACHINE_END

/*
 * IXDP28x5 is basically an IXDP2801 with a different CPU but Intel
 * changed the machine ID in the bootloader
 */
MACHINE_START(IXDP28X5, "Intel IXDP2805/2855 Development Platform")
      /* Maintainer: MontaVista Software, Inc. */
      .phys_io    = IXP2000_UART_PHYS_BASE,
      .io_pg_offst      = ((IXP2000_UART_VIRT_BASE) >> 18) & 0xfffc,
      .boot_params      = 0x00000100,
      .map_io           = ixdp2x01_map_io,
      .init_irq   = ixdp2x01_init_irq,
      .timer            = &ixdp2x01_timer,
      .init_machine     = ixdp2x01_init_machine,
MACHINE_END
#endif



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