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lite5200.c

/*
 * Freescale Lite5200 board support
 *
 * Written by: Grant Likely <grant.likely@secretlab.ca>
 *
 * Copyright (C) Secret Lab Technologies Ltd. 2006. All rights reserved.
 * Copyright (C) Freescale Semicondutor, Inc. 2006. All rights reserved.
 *
 * Description:
 * 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.
 */

#undef DEBUG

#include <linux/init.h>
#include <linux/pci.h>
#include <linux/of.h>
#include <linux/root_dev.h>
#include <linux/initrd.h>
#include <asm/time.h>
#include <asm/io.h>
#include <asm/machdep.h>
#include <asm/prom.h>
#include <asm/mpc52xx.h>

/* ************************************************************************
 *
 * Setup the architecture
 *
 */

/* mpc5200 device tree match tables */
static struct of_device_id mpc5200_cdm_ids[] __initdata = {
      { .compatible = "fsl,mpc5200-cdm", },
      { .compatible = "mpc5200-cdm", },
      {}
};

static struct of_device_id mpc5200_gpio_ids[] __initdata = {
      { .compatible = "fsl,mpc5200-gpio", },
      { .compatible = "mpc5200-gpio", },
      {}
};

/*
 * Fix clock configuration.
 *
 * Firmware is supposed to be responsible for this.  If you are creating a
 * new board port, do *NOT* duplicate this code.  Fix your boot firmware
 * to set it correctly in the first place
 */
static void __init
lite5200_fix_clock_config(void)
{
      struct device_node *np;
      struct mpc52xx_cdm  __iomem *cdm;
      /* Map zones */
      np = of_find_matching_node(NULL, mpc5200_cdm_ids);
      cdm = of_iomap(np, 0);
      of_node_put(np);
      if (!cdm) {
            printk(KERN_ERR "%s() failed; expect abnormal behaviour\n",
                   __func__);
            return;
      }

      /* Use internal 48 Mhz */
      out_8(&cdm->ext_48mhz_en, 0x00);
      out_8(&cdm->fd_enable, 0x01);
      if (in_be32(&cdm->rstcfg) & 0x40)   /* Assumes 33Mhz clock */
            out_be16(&cdm->fd_counters, 0x0001);
      else
            out_be16(&cdm->fd_counters, 0x5555);

      /* Unmap the regs */
      iounmap(cdm);
}

/*
 * Fix setting of port_config register.
 *
 * Firmware is supposed to be responsible for this.  If you are creating a
 * new board port, do *NOT* duplicate this code.  Fix your boot firmware
 * to set it correctly in the first place
 */
static void __init
lite5200_fix_port_config(void)
{
      struct device_node *np;
      struct mpc52xx_gpio __iomem *gpio;
      u32 port_config;

      np = of_find_matching_node(NULL, mpc5200_gpio_ids);
      gpio = of_iomap(np, 0);
      of_node_put(np);
      if (!gpio) {
            printk(KERN_ERR "%s() failed. expect abnormal behavior\n",
                   __func__);
            return;
      }

      /* Set port config */
      port_config = in_be32(&gpio->port_config);

      port_config &= ~0x00800000;   /* 48Mhz internal, pin is GPIO      */

      port_config &= ~0x00007000;   /* USB port : Differential mode     */
      port_config |=  0x00001000;   /*            USB 1 only      */

      port_config &= ~0x03000000;   /* ATA CS is on csb_4/5       */
      port_config |=  0x01000000;

      pr_debug("port_config: old:%x new:%x\n",
               in_be32(&gpio->port_config), port_config);
      out_be32(&gpio->port_config, port_config);

      /* Unmap zone */
      iounmap(gpio);
}

#ifdef CONFIG_PM
static void lite5200_suspend_prepare(void __iomem *mbar)
{
      u8 pin = 1; /* GPIO_WKUP_1 (GPIO_PSC2_4) */
      u8 level = 0;     /* wakeup on low level */
      mpc52xx_set_wakeup_gpio(pin, level);

      /*
       * power down usb port
       * this needs to be called before of-ohci suspend code
       */

      /* set ports to "power switched" and "powered at the same time"
       * USB Rh descriptor A: NPS = 0, PSM = 0 */
      out_be32(mbar + 0x1048, in_be32(mbar + 0x1048) & ~0x300);
      /* USB Rh status: LPS = 1 - turn off power */
      out_be32(mbar + 0x1050, 0x00000001);
}

static void lite5200_resume_finish(void __iomem *mbar)
{
      /* USB Rh status: LPSC = 1 - turn on power */
      out_be32(mbar + 0x1050, 0x00010000);
}
#endif

static void __init lite5200_setup_arch(void)
{
      if (ppc_md.progress)
            ppc_md.progress("lite5200_setup_arch()", 0);

      /* Map important registers from the internal memory map */
      mpc52xx_map_common_devices();

      /* Some mpc5200 & mpc5200b related configuration */
      mpc5200_setup_xlb_arbiter();

      /* Fix things that firmware should have done. */
      lite5200_fix_clock_config();
      lite5200_fix_port_config();

#ifdef CONFIG_PM
      mpc52xx_suspend.board_suspend_prepare = lite5200_suspend_prepare;
      mpc52xx_suspend.board_resume_finish = lite5200_resume_finish;
      lite5200_pm_init();
#endif

      mpc52xx_setup_pci();
}

/*
 * Called very early, MMU is off, device-tree isn't unflattened
 */
static int __init lite5200_probe(void)
{
      unsigned long node = of_get_flat_dt_root();
      const char *model = of_get_flat_dt_prop(node, "model", NULL);

      if (!of_flat_dt_is_compatible(node, "fsl,lite5200") &&
          !of_flat_dt_is_compatible(node, "fsl,lite5200b"))
            return 0;
      pr_debug("%s board found\n", model ? model : "unknown");

      return 1;
}

define_machine(lite5200) {
      .name             = "lite5200",
      .probe            = lite5200_probe,
      .setup_arch       = lite5200_setup_arch,
      .init       = mpc52xx_declare_of_platform_devices,
      .init_IRQ   = mpc52xx_init_irq,
      .get_irq    = mpc52xx_get_irq,
      .restart    = mpc52xx_restart,
      .calibrate_decr   = generic_calibrate_decr,
};

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