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linkstation.c

/*
 * Board setup routines for the Buffalo Linkstation / Kurobox Platform.
 *
 * Copyright (C) 2006 G. Liakhovetski (g.liakhovetski@gmx.de)
 *
 * Based on sandpoint.c by Mark A. Greer
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2.  This program is licensed "as is" without any warranty of
 * any kind, whether express or implied.
 */

#include <linux/kernel.h>
#include <linux/initrd.h>
#include <linux/mtd/physmap.h>
#include <linux/of_platform.h>

#include <asm/time.h>
#include <asm/prom.h>
#include <asm/mpic.h>
#include <asm/pci-bridge.h>

#include "mpc10x.h"

static struct mtd_partition linkstation_physmap_partitions[] = {
      {
            .name   = "mtd_firmimg",
            .offset = 0x000000,
            .size   = 0x300000,
      },
      {
            .name   = "mtd_bootcode",
            .offset = 0x300000,
            .size   = 0x070000,
      },
      {
            .name   = "mtd_status",
            .offset = 0x370000,
            .size   = 0x010000,
      },
      {
            .name   = "mtd_conf",
            .offset = 0x380000,
            .size   = 0x080000,
      },
      {
            .name   = "mtd_allflash",
            .offset = 0x000000,
            .size   = 0x400000,
      },
      {
            .name   = "mtd_data",
            .offset = 0x310000,
            .size   = 0x0f0000,
      },
};

static __initdata struct of_device_id of_bus_ids[] = {
      { .type = "soc", },
      { .compatible = "simple-bus", },
      {},
};

static int __init declare_of_platform_devices(void)
{
      of_platform_bus_probe(NULL, of_bus_ids, NULL);
      return 0;
}
machine_device_initcall(linkstation, declare_of_platform_devices);

static int __init linkstation_add_bridge(struct device_node *dev)
{
#ifdef CONFIG_PCI
      int len;
      struct pci_controller *hose;
      const int *bus_range;

      printk("Adding PCI host bridge %s\n", dev->full_name);

      bus_range = of_get_property(dev, "bus-range", &len);
      if (bus_range == NULL || len < 2 * sizeof(int))
            printk(KERN_WARNING "Can't get bus-range for %s, assume"
                        " bus 0\n", dev->full_name);

      hose = pcibios_alloc_controller(dev);
      if (hose == NULL)
            return -ENOMEM;
      hose->first_busno = bus_range ? bus_range[0] : 0;
      hose->last_busno = bus_range ? bus_range[1] : 0xff;
      setup_indirect_pci(hose, 0xfec00000, 0xfee00000, 0);

      /* Interpret the "ranges" property */
      /* This also maps the I/O region and sets isa_io/mem_base */
      pci_process_bridge_OF_ranges(hose, dev, 1);
#endif
      return 0;
}

static void __init linkstation_setup_arch(void)
{
      struct device_node *np;
#ifdef CONFIG_MTD_PHYSMAP
      physmap_set_partitions(linkstation_physmap_partitions,
                         ARRAY_SIZE(linkstation_physmap_partitions));
#endif

      /* Lookup PCI host bridges */
      for_each_compatible_node(np, "pci", "mpc10x-pci")
            linkstation_add_bridge(np);

      printk(KERN_INFO "BUFFALO Network Attached Storage Series\n");
      printk(KERN_INFO "(C) 2002-2005 BUFFALO INC.\n");
}

/*
 * Interrupt setup and service.  Interrupts on the linkstation come
 * from the four PCI slots plus onboard 8241 devices: I2C, DUART.
 */
static void __init linkstation_init_IRQ(void)
{
      struct mpic *mpic;
      struct device_node *dnp;
      const u32 *prop;
      int size;
      phys_addr_t paddr;

      dnp = of_find_node_by_type(NULL, "open-pic");
      if (dnp == NULL)
            return;

      prop = of_get_property(dnp, "reg", &size);
      paddr = (phys_addr_t)of_translate_address(dnp, prop);

      mpic = mpic_alloc(dnp, paddr, MPIC_PRIMARY | MPIC_WANTS_RESET, 4, 32, " EPIC     ");
      BUG_ON(mpic == NULL);

      /* PCI IRQs */
      mpic_assign_isu(mpic, 0, paddr + 0x10200);

      /* I2C */
      mpic_assign_isu(mpic, 1, paddr + 0x11000);

      /* ttyS0, ttyS1 */
      mpic_assign_isu(mpic, 2, paddr + 0x11100);

      mpic_init(mpic);
}

extern void avr_uart_configure(void);
extern void avr_uart_send(const char);

static void linkstation_restart(char *cmd)
{
      local_irq_disable();

      /* Reset system via AVR */
      avr_uart_configure();
      /* Send reboot command */
      avr_uart_send('C');

      for(;;)  /* Spin until reset happens */
            avr_uart_send('G');     /* "kick" */
}

static void linkstation_power_off(void)
{
      local_irq_disable();

      /* Power down system via AVR */
      avr_uart_configure();
      /* send shutdown command */
      avr_uart_send('E');

      for(;;)  /* Spin until power-off happens */
            avr_uart_send('G');     /* "kick" */
      /* NOTREACHED */
}

static void linkstation_halt(void)
{
      linkstation_power_off();
      /* NOTREACHED */
}

static void linkstation_show_cpuinfo(struct seq_file *m)
{
      seq_printf(m, "vendor\t\t: Buffalo Technology\n");
      seq_printf(m, "machine\t\t: Linkstation I/Kurobox(HG)\n");
}

static int __init linkstation_probe(void)
{
      unsigned long root;

      root = of_get_flat_dt_root();

      if (!of_flat_dt_is_compatible(root, "linkstation"))
            return 0;
      return 1;
}

define_machine(linkstation){
      .name                   = "Buffalo Linkstation",
      .probe                  = linkstation_probe,
      .setup_arch             = linkstation_setup_arch,
      .init_IRQ         = linkstation_init_IRQ,
      .show_cpuinfo           = linkstation_show_cpuinfo,
      .get_irq          = mpic_get_irq,
      .restart          = linkstation_restart,
      .power_off        = linkstation_power_off,
      .halt             = linkstation_halt,
      .calibrate_decr   = generic_calibrate_decr,
};

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