linux/arch/powerpc/platforms/52xx/lite5200.c
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   1/*
   2 * Freescale Lite5200 board support
   3 *
   4 * Written by: Grant Likely <grant.likely@secretlab.ca>
   5 *
   6 * Copyright (C) Secret Lab Technologies Ltd. 2006. All rights reserved.
   7 * Copyright (C) Freescale Semicondutor, Inc. 2006. All rights reserved.
   8 *
   9 * Description:
  10 * This program is free software; you can redistribute  it and/or modify it
  11 * under  the terms of  the GNU General  Public License as published by the
  12 * Free Software Foundation;  either version 2 of the  License, or (at your
  13 * option) any later version.
  14 */
  15
  16#undef DEBUG
  17
  18#include <linux/init.h>
  19#include <linux/pci.h>
  20#include <linux/of.h>
  21#include <linux/of_address.h>
  22#include <linux/root_dev.h>
  23#include <linux/initrd.h>
  24#include <asm/time.h>
  25#include <asm/io.h>
  26#include <asm/machdep.h>
  27#include <asm/prom.h>
  28#include <asm/mpc52xx.h>
  29
  30/* ************************************************************************
  31 *
  32 * Setup the architecture
  33 *
  34 */
  35
  36/* mpc5200 device tree match tables */
  37static struct of_device_id mpc5200_cdm_ids[] __initdata = {
  38        { .compatible = "fsl,mpc5200-cdm", },
  39        { .compatible = "mpc5200-cdm", },
  40        {}
  41};
  42
  43static struct of_device_id mpc5200_gpio_ids[] __initdata = {
  44        { .compatible = "fsl,mpc5200-gpio", },
  45        { .compatible = "mpc5200-gpio", },
  46        {}
  47};
  48
  49/*
  50 * Fix clock configuration.
  51 *
  52 * Firmware is supposed to be responsible for this.  If you are creating a
  53 * new board port, do *NOT* duplicate this code.  Fix your boot firmware
  54 * to set it correctly in the first place
  55 */
  56static void __init
  57lite5200_fix_clock_config(void)
  58{
  59        struct device_node *np;
  60        struct mpc52xx_cdm  __iomem *cdm;
  61        /* Map zones */
  62        np = of_find_matching_node(NULL, mpc5200_cdm_ids);
  63        cdm = of_iomap(np, 0);
  64        of_node_put(np);
  65        if (!cdm) {
  66                printk(KERN_ERR "%s() failed; expect abnormal behaviour\n",
  67                       __func__);
  68                return;
  69        }
  70
  71        /* Use internal 48 Mhz */
  72        out_8(&cdm->ext_48mhz_en, 0x00);
  73        out_8(&cdm->fd_enable, 0x01);
  74        if (in_be32(&cdm->rstcfg) & 0x40)       /* Assumes 33Mhz clock */
  75                out_be16(&cdm->fd_counters, 0x0001);
  76        else
  77                out_be16(&cdm->fd_counters, 0x5555);
  78
  79        /* Unmap the regs */
  80        iounmap(cdm);
  81}
  82
  83/*
  84 * Fix setting of port_config register.
  85 *
  86 * Firmware is supposed to be responsible for this.  If you are creating a
  87 * new board port, do *NOT* duplicate this code.  Fix your boot firmware
  88 * to set it correctly in the first place
  89 */
  90static void __init
  91lite5200_fix_port_config(void)
  92{
  93        struct device_node *np;
  94        struct mpc52xx_gpio __iomem *gpio;
  95        u32 port_config;
  96
  97        np = of_find_matching_node(NULL, mpc5200_gpio_ids);
  98        gpio = of_iomap(np, 0);
  99        of_node_put(np);
 100        if (!gpio) {
 101                printk(KERN_ERR "%s() failed. expect abnormal behavior\n",
 102                       __func__);
 103                return;
 104        }
 105
 106        /* Set port config */
 107        port_config = in_be32(&gpio->port_config);
 108
 109        port_config &= ~0x00800000;     /* 48Mhz internal, pin is GPIO  */
 110
 111        port_config &= ~0x00007000;     /* USB port : Differential mode */
 112        port_config |=  0x00001000;     /*            USB 1 only        */
 113
 114        port_config &= ~0x03000000;     /* ATA CS is on csb_4/5         */
 115        port_config |=  0x01000000;
 116
 117        pr_debug("port_config: old:%x new:%x\n",
 118                 in_be32(&gpio->port_config), port_config);
 119        out_be32(&gpio->port_config, port_config);
 120
 121        /* Unmap zone */
 122        iounmap(gpio);
 123}
 124
 125#ifdef CONFIG_PM
 126static void lite5200_suspend_prepare(void __iomem *mbar)
 127{
 128        u8 pin = 1;     /* GPIO_WKUP_1 (GPIO_PSC2_4) */
 129        u8 level = 0;   /* wakeup on low level */
 130        mpc52xx_set_wakeup_gpio(pin, level);
 131
 132        /*
 133         * power down usb port
 134         * this needs to be called before of-ohci suspend code
 135         */
 136
 137        /* set ports to "power switched" and "powered at the same time"
 138         * USB Rh descriptor A: NPS = 0, PSM = 0 */
 139        out_be32(mbar + 0x1048, in_be32(mbar + 0x1048) & ~0x300);
 140        /* USB Rh status: LPS = 1 - turn off power */
 141        out_be32(mbar + 0x1050, 0x00000001);
 142}
 143
 144static void lite5200_resume_finish(void __iomem *mbar)
 145{
 146        /* USB Rh status: LPSC = 1 - turn on power */
 147        out_be32(mbar + 0x1050, 0x00010000);
 148}
 149#endif
 150
 151static void __init lite5200_setup_arch(void)
 152{
 153        if (ppc_md.progress)
 154                ppc_md.progress("lite5200_setup_arch()", 0);
 155
 156        /* Map important registers from the internal memory map */
 157        mpc52xx_map_common_devices();
 158
 159        /* Some mpc5200 & mpc5200b related configuration */
 160        mpc5200_setup_xlb_arbiter();
 161
 162        /* Fix things that firmware should have done. */
 163        lite5200_fix_clock_config();
 164        lite5200_fix_port_config();
 165
 166#ifdef CONFIG_PM
 167        mpc52xx_suspend.board_suspend_prepare = lite5200_suspend_prepare;
 168        mpc52xx_suspend.board_resume_finish = lite5200_resume_finish;
 169        lite5200_pm_init();
 170#endif
 171
 172        mpc52xx_setup_pci();
 173}
 174
 175static const char *board[] __initdata = {
 176        "fsl,lite5200",
 177        "fsl,lite5200b",
 178        NULL,
 179};
 180
 181/*
 182 * Called very early, MMU is off, device-tree isn't unflattened
 183 */
 184static int __init lite5200_probe(void)
 185{
 186        return of_flat_dt_match(of_get_flat_dt_root(), board);
 187}
 188
 189define_machine(lite5200) {
 190        .name           = "lite5200",
 191        .probe          = lite5200_probe,
 192        .setup_arch     = lite5200_setup_arch,
 193        .init           = mpc52xx_declare_of_platform_devices,
 194        .init_IRQ       = mpc52xx_init_irq,
 195        .get_irq        = mpc52xx_get_irq,
 196        .restart        = mpc52xx_restart,
 197        .calibrate_decr = generic_calibrate_decr,
 198};
 199