lite5200.c

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/*
 * Freescale Lite5200 board support
 *
 * Written by: Grant Likely <[email protected]>
 *
 * 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/of_address.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();
}

static const char * const board[] __initconst = {
    "fsl,lite5200",
    "fsl,lite5200b",
    NULL,
};

/*
 * Called very early, MMU is off, device-tree isn't unflattened
 */
static int __init lite5200_probe(void)
{
    return of_flat_dt_match(of_get_flat_dt_root(), board);
}

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,
};