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mgcoge.c

/*
 * Keymile mgcoge support
 * Copyright 2008 DENX Software Engineering GmbH
 * Author: Heiko Schocher <hs@denx.de>
 *
 * based on code from:
 * Copyright 2007 Freescale Semiconductor, Inc.
 * Author: Scott Wood <scottwood@freescale.com>
 *
 * 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/init.h>
#include <linux/interrupt.h>
#include <linux/fsl_devices.h>
#include <linux/of_platform.h>

#include <asm/io.h>
#include <asm/cpm2.h>
#include <asm/udbg.h>
#include <asm/machdep.h>
#include <asm/time.h>
#include <asm/mpc8260.h>
#include <asm/prom.h>

#include <sysdev/fsl_soc.h>
#include <sysdev/cpm2_pic.h>

#include "pq2.h"

static void __init mgcoge_pic_init(void)
{
      struct device_node *np = of_find_compatible_node(NULL, NULL, "fsl,pq2-pic");
      if (!np) {
            printk(KERN_ERR "PIC init: can not find cpm-pic node\n");
            return;
      }

      cpm2_pic_init(np);
      of_node_put(np);
}

struct cpm_pin {
      int port, pin, flags;
};

static __initdata struct cpm_pin mgcoge_pins[] = {

      /* SMC2 */
      {1, 8, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
      {1, 9, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},

      /* SCC4 */
      {3, 25, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
      {3, 24, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
      {3,  9, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
      {3,  8, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
      {4, 22, CPM_PIN_INPUT | CPM_PIN_PRIMARY},
      {4, 21, CPM_PIN_OUTPUT | CPM_PIN_PRIMARY},
};

static void __init init_ioports(void)
{
      int i;

      for (i = 0; i < ARRAY_SIZE(mgcoge_pins); i++) {
            const struct cpm_pin *pin = &mgcoge_pins[i];
            cpm2_set_pin(pin->port - 1, pin->pin, pin->flags);
      }

      cpm2_smc_clk_setup(CPM_CLK_SMC2, CPM_BRG8);
      cpm2_clk_setup(CPM_CLK_SCC4, CPM_CLK7, CPM_CLK_RX);
      cpm2_clk_setup(CPM_CLK_SCC4, CPM_CLK8, CPM_CLK_TX);
}

static void __init mgcoge_setup_arch(void)
{
      if (ppc_md.progress)
            ppc_md.progress("mgcoge_setup_arch()", 0);

      cpm2_reset();

      /* When this is set, snooping CPM DMA from RAM causes
       * machine checks.  See erratum SIU18.
       */
      clrbits32(&cpm2_immr->im_siu_conf.siu_82xx.sc_bcr, MPC82XX_BCR_PLDP);

      init_ioports();

      if (ppc_md.progress)
            ppc_md.progress("mgcoge_setup_arch(), finish", 0);
}

static  __initdata struct of_device_id of_bus_ids[] = {
      { .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(mgcoge, declare_of_platform_devices);

/*
 * Called very early, device-tree isn't unflattened
 */
static int __init mgcoge_probe(void)
{
      unsigned long root = of_get_flat_dt_root();
      return of_flat_dt_is_compatible(root, "keymile,mgcoge");
}

define_machine(mgcoge)
{
      .name = "Keymile MGCOGE",
      .probe = mgcoge_probe,
      .setup_arch = mgcoge_setup_arch,
      .init_IRQ = mgcoge_pic_init,
      .get_irq = cpm2_get_irq,
      .calibrate_decr = generic_calibrate_decr,
      .restart = pq2_restart,
      .progress = udbg_progress,
};

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