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ixdp2x00.c

/*
 * arch/arm/mach-ixp2000/ixdp2x00.c
 *
 * Code common to IXDP2400 and IXDP2800 platforms.
 *
 * Original Author: Naeem Afzal <naeem.m.afzal@intel.com>
 * Maintainer: Deepak Saxena <dsaxena@plexity.net>
 *
 * Copyright (C) 2002 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/platform_device.h>
#include <linux/bitops.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/delay.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/system.h>
#include <asm/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/flash.h>
#include <asm/mach/arch.h>

#include <asm/arch/gpio.h>


/*************************************************************************
 * IXDP2x00 IRQ Initialization
 *************************************************************************/
static volatile unsigned long *board_irq_mask;
static volatile unsigned long *board_irq_stat;
static unsigned long board_irq_count;

#ifdef CONFIG_ARCH_IXDP2400
/*
 * Slowport configuration for accessing CPLD registers on IXDP2x00
 */
static struct slowport_cfg slowport_cpld_cfg = {
      .CCR =      SLOWPORT_CCR_DIV_2,
      .WTC = 0x00000070,
      .RTC = 0x00000070,
      .PCR = SLOWPORT_MODE_FLASH,
      .ADC = SLOWPORT_ADDR_WIDTH_24 | SLOWPORT_DATA_WIDTH_8
};
#endif

static void ixdp2x00_irq_mask(unsigned int irq)
{
      unsigned long dummy;
      static struct slowport_cfg old_cfg;

      /*
       * This is ugly in common code but really don't know
       * of a better way to handle it. :(
       */
#ifdef CONFIG_ARCH_IXDP2400
      if (machine_is_ixdp2400())
            ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);
#endif

      dummy = *board_irq_mask;
      dummy |=  IXP2000_BOARD_IRQ_MASK(irq);
      ixp2000_reg_wrb(board_irq_mask, dummy);

#ifdef CONFIG_ARCH_IXDP2400
      if (machine_is_ixdp2400())
            ixp2000_release_slowport(&old_cfg);
#endif
}

static void ixdp2x00_irq_unmask(unsigned int irq)
{
      unsigned long dummy;
      static struct slowport_cfg old_cfg;

#ifdef CONFIG_ARCH_IXDP2400
      if (machine_is_ixdp2400())
            ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);
#endif

      dummy = *board_irq_mask;
      dummy &=  ~IXP2000_BOARD_IRQ_MASK(irq);
      ixp2000_reg_wrb(board_irq_mask, dummy);

      if (machine_is_ixdp2400()) 
            ixp2000_release_slowport(&old_cfg);
}

static void ixdp2x00_irq_handler(unsigned int irq, struct irq_desc *desc)
{
        volatile u32 ex_interrupt = 0;
      static struct slowport_cfg old_cfg;
      int i;

      desc->chip->mask(irq);

#ifdef CONFIG_ARCH_IXDP2400
      if (machine_is_ixdp2400())
            ixp2000_acquire_slowport(&slowport_cpld_cfg, &old_cfg);
#endif
        ex_interrupt = *board_irq_stat & 0xff;
      if (machine_is_ixdp2400())
            ixp2000_release_slowport(&old_cfg);

      if(!ex_interrupt) {
            printk(KERN_ERR "Spurious IXDP2x00 CPLD interrupt!\n");
            return;
      }

      for(i = 0; i < board_irq_count; i++) {
            if(ex_interrupt & (1 << i))  {
                  struct irq_desc *cpld_desc;
                  int cpld_irq = IXP2000_BOARD_IRQ(0) + i;
                  cpld_desc = irq_desc + cpld_irq;
                  desc_handle_irq(cpld_irq, cpld_desc);
            }
      }

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

static struct irq_chip ixdp2x00_cpld_irq_chip = {
      .ack  = ixdp2x00_irq_mask,
      .mask = ixdp2x00_irq_mask,
      .unmask     = ixdp2x00_irq_unmask
};

void __init ixdp2x00_init_irq(volatile unsigned long *stat_reg, volatile unsigned long *mask_reg, unsigned long nr_irqs)
{
      unsigned int irq;

      ixp2000_init_irq();
      
      if (!ixdp2x00_master_npu())
            return;

      board_irq_stat = stat_reg;
      board_irq_mask = mask_reg;
      board_irq_count = nr_irqs;

      *board_irq_mask = 0xffffffff;

      for(irq = IXP2000_BOARD_IRQ(0); irq < IXP2000_BOARD_IRQ(board_irq_count); irq++) {
            set_irq_chip(irq, &ixdp2x00_cpld_irq_chip);
            set_irq_handler(irq, handle_level_irq);
            set_irq_flags(irq, IRQF_VALID);
      }

      /* Hook into PCI interrupt */
      set_irq_chained_handler(IRQ_IXP2000_PCIB, ixdp2x00_irq_handler);
}

/*************************************************************************
 * IXDP2x00 memory map
 *************************************************************************/
static struct map_desc ixdp2x00_io_desc __initdata = {
      .virtual    = IXDP2X00_VIRT_CPLD_BASE, 
      .pfn        = __phys_to_pfn(IXDP2X00_PHYS_CPLD_BASE),
      .length           = IXDP2X00_CPLD_SIZE,
      .type       = MT_DEVICE
};

void __init ixdp2x00_map_io(void)
{
      ixp2000_map_io(); 

      iotable_init(&ixdp2x00_io_desc, 1);
}

/*************************************************************************
 * IXDP2x00-common PCI init
 *
 * The IXDP2[48]00 has a horrid PCI bus layout. Basically the board 
 * contains two NPUs (ingress and egress) connected over PCI,  both running 
 * instances  of the kernel. So far so good. Peers on the PCI bus running 
 * Linux is a common design in telecom systems. The problem is that instead 
 * of all the devices being controlled by a single host, different
 * devices are controlled by different NPUs on the same bus, leading to
 * multiple hosts on the bus. The exact bus layout looks like:
 *
 *                   Bus 0
 *    Master NPU <-------------------+-------------------> Slave NPU
 *                                   |
 *                                   |
 *                                  P2P 
 *                                   |
 *
 *                  Bus 1            |
 *               <--+------+---------+---------+------+-->
 *                  |      |         |         |      |
 *                  |      |         |         |      |
 *             ... Dev    PMC       Media     Eth0   Eth1 ...
 *
 * The master controls all but Eth1, which is controlled by the
 * slave. What this means is that the both the master and the slave
 * have to scan the bus, but only one of them can enumerate the bus.
 * In addition, after the bus is scanned, each kernel must remove
 * the device(s) it does not control from the PCI dev list otherwise
 * a driver on each NPU will try to manage it and we will have horrible
 * conflicts. Oh..and the slave NPU needs to see the master NPU
 * for Intel's drivers to work properly. Closed source drivers...
 *
 * The way we deal with this is fairly simple but ugly:
 *
 * 1) Let master scan and enumerate the bus completely.
 * 2) Master deletes Eth1 from device list.
 * 3) Slave scans bus and then deletes all but Eth1 (Eth0 on slave)
 *    from device list.
 * 4) Find HW designers and LART them.
 *
 * The boards also do not do normal PCI IRQ routing, or any sort of 
 * sensical  swizzling, so we just need to check where on the  bus a
 * device sits and figure out to which CPLD pin the interrupt is routed.
 * See ixdp2[48]00.c files.
 *
 *************************************************************************/
void ixdp2x00_slave_pci_postinit(void)
{
      struct pci_dev *dev;

      /*
       * Remove PMC device is there is one
       */
      if((dev = pci_get_bus_and_slot(1, IXDP2X00_PMC_DEVFN))) {
            pci_remove_bus_device(dev);
            pci_dev_put(dev);
      }

      dev = pci_get_bus_and_slot(0, IXDP2X00_21555_DEVFN);
      pci_remove_bus_device(dev);
      pci_dev_put(dev);
}

/**************************************************************************
 * IXDP2x00 Machine Setup
 *************************************************************************/
static struct flash_platform_data ixdp2x00_platform_data = {
      .map_name   = "cfi_probe",
      .width            = 1,
};

static struct ixp2000_flash_data ixdp2x00_flash_data = {
      .platform_data    = &ixdp2x00_platform_data,
      .nr_banks   = 1
};

static struct resource ixdp2x00_flash_resource = {
      .start            = 0xc4000000,
      .end        = 0xc4000000 + 0x00ffffff,
      .flags            = IORESOURCE_MEM,
};

static struct platform_device ixdp2x00_flash = {
      .name       = "IXP2000-Flash",
      .id         = 0,
      .dev        = {
            .platform_data = &ixdp2x00_flash_data,
      },
      .num_resources    = 1,
      .resource   = &ixdp2x00_flash_resource,
};

static struct ixp2000_i2c_pins ixdp2x00_i2c_gpio_pins = {
      .sda_pin    = IXDP2X00_GPIO_SDA,
      .scl_pin    = IXDP2X00_GPIO_SCL,
};

static struct platform_device ixdp2x00_i2c_controller = {
      .name       = "IXP2000-I2C",
      .id         = 0,
      .dev        = {
            .platform_data = &ixdp2x00_i2c_gpio_pins,
      },
      .num_resources    = 0
};

static struct platform_device *ixdp2x00_devices[] __initdata = {
      &ixdp2x00_flash,
      &ixdp2x00_i2c_controller
};

void __init ixdp2x00_init_machine(void)
{
      gpio_line_set(IXDP2X00_GPIO_I2C_ENABLE, 1);
      gpio_line_config(IXDP2X00_GPIO_I2C_ENABLE, GPIO_OUT);

      platform_add_devices(ixdp2x00_devices, ARRAY_SIZE(ixdp2x00_devices));
      ixp2000_uart_init();
}


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