arch/powerpc/platforms/52xx/lite5200.c

   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/stddef.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/errno.h>
  22 #include <linux/reboot.h>
  23 #include <linux/pci.h>
  24 #include <linux/kdev_t.h>
  25 #include <linux/major.h>
  26 #include <linux/console.h>
  27 #include <linux/delay.h>
  28 #include <linux/seq_file.h>
  29 #include <linux/root_dev.h>
  30 #include <linux/initrd.h>
  31
  32 #include <asm/system.h>
  33 #include <asm/atomic.h>
  34 #include <asm/time.h>
  35 #include <asm/io.h>
  36 #include <asm/machdep.h>
  37 #include <asm/ipic.h>
  38 #include <asm/irq.h>
  39 #include <asm/prom.h>
  40 #include <asm/udbg.h>
  41 #include <sysdev/fsl_soc.h>
  42 #include <asm/of_platform.h>
  43
  44 #include <asm/mpc52xx.h>
  45
  46 /* ************************************************************************
  47  *
  48  * Setup the architecture
  49  *
  50  */
  51
  52 static void __init
  53 lite5200_setup_cpu(void)
  54 {
  55         struct mpc52xx_gpio __iomem *gpio;
  56         u32 port_config;
  57
  58         /* Map zones */
  59         gpio = mpc52xx_find_and_map("mpc5200-gpio");
  60         if (!gpio) {
  61                 printk(KERN_ERR __FILE__ ": "
  62                         "Error while mapping GPIO register for port config. "
  63                         "Expect some abnormal behavior\n");
  64                 goto error;
  65         }
  66
  67         /* Set port config */
  68         port_config = in_be32(&gpio->port_config);
  69
  70         port_config &= ~0x00800000;     /* 48Mhz internal, pin is GPIO  */
  71
  72         port_config &= ~0x00007000;     /* USB port : Differential mode */
  73         port_config |=  0x00001000;     /*            USB 1 only        */
  74
  75         port_config &= ~0x03000000;     /* ATA CS is on csb_4/5         */
  76         port_config |=  0x01000000;
  77
  78         pr_debug("port_config: old:%x new:%x\n",
  79                  in_be32(&gpio->port_config), port_config);
  80         out_be32(&gpio->port_config, port_config);
  81
  82         /* Unmap zone */
  83 error:
  84         iounmap(gpio);
  85 }
  86
  87 #ifdef CONFIG_PM
  88 static u32 descr_a;
  89 static void lite5200_suspend_prepare(void __iomem *mbar)
  90 {
  91         u8 pin = 1;     /* GPIO_WKUP_1 (GPIO_PSC2_4) */
  92         u8 level = 0;   /* wakeup on low level */
  93         mpc52xx_set_wakeup_gpio(pin, level);
  94
  95         /*
  96          * power down usb port
  97          * this needs to be called before of-ohci suspend code
  98          */
  99         descr_a = in_be32(mbar + 0x1048);
 100         out_be32(mbar + 0x1048, (descr_a & ~0x200) | 0x100);
 101 }
 102
 103 static void lite5200_resume_finish(void __iomem *mbar)
 104 {
 105         out_be32(mbar + 0x1048, descr_a);
 106 }
 107 #endif
 108
 109 static void __init lite5200_setup_arch(void)
 110 {
 111 #ifdef CONFIG_PCI
 112         struct device_node *np;
 113 #endif
 114
 115         if (ppc_md.progress)
 116                 ppc_md.progress("lite5200_setup_arch()", 0);
 117
 118         /* CPU & Port mux setup */
 119         mpc52xx_setup_cpu();    /* Generic */
 120         lite5200_setup_cpu();   /* Platorm specific */
 121
 122 #ifdef CONFIG_PM
 123         mpc52xx_suspend.board_suspend_prepare = lite5200_suspend_prepare;
 124         mpc52xx_suspend.board_resume_finish = lite5200_resume_finish;
 125         mpc52xx_pm_init();
 126 #endif
 127
 128 #ifdef CONFIG_PCI
 129         np = of_find_node_by_type(NULL, "pci");
 130         if (np) {
 131                 mpc52xx_add_bridge(np);
 132                 of_node_put(np);
 133         }
 134 #endif
 135
 136 #ifdef CONFIG_BLK_DEV_INITRD
 137         if (initrd_start)
 138                 ROOT_DEV = Root_RAM0;
 139         else
 140 #endif
 141 #ifdef  CONFIG_ROOT_NFS
 142                 ROOT_DEV = Root_NFS;
 143 #else
 144                 ROOT_DEV = Root_HDA1;
 145 #endif
 146
 147 }
 148
 149 static void lite5200_show_cpuinfo(struct seq_file *m)
 150 {
 151         struct device_node* np = of_find_all_nodes(NULL);
 152         const char *model = NULL;
 153
 154         if (np)
 155                 model = of_get_property(np, "model", NULL);
 156
 157         seq_printf(m, "vendor\t\t:      Freescale Semiconductor\n");
 158         seq_printf(m, "machine\t\t:     %s\n", model ? model : "unknown");
 159
 160         of_node_put(np);
 161 }
 162
 163 /*
 164  * Called very early, MMU is off, device-tree isn't unflattened
 165  */
 166 static int __init lite5200_probe(void)
 167 {
 168         unsigned long node = of_get_flat_dt_root();
 169         const char *model = of_get_flat_dt_prop(node, "model", NULL);
 170
 171         if (!of_flat_dt_is_compatible(node, "fsl,lite5200") &&
 172             !of_flat_dt_is_compatible(node, "fsl,lite5200b"))
 173                 return 0;
 174         pr_debug("%s board found\n", model ? model : "unknown");
 175
 176         return 1;
 177 }
 178
 179 define_machine(lite5200) {
 180         .name           = "lite5200",
 181         .probe          = lite5200_probe,
 182         .setup_arch     = lite5200_setup_arch,
 183         .init           = mpc52xx_declare_of_platform_devices,
 184         .init_IRQ       = mpc52xx_init_irq,
 185         .get_irq        = mpc52xx_get_irq,
 186         .show_cpuinfo   = lite5200_show_cpuinfo,
 187         .calibrate_decr = generic_calibrate_decr,
 188 };