release/src-rt-6.x/linux/linux-2.6/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/bootinfo.h>
  39 #include <asm/irq.h>
  40 #include <asm/prom.h>
  41 #include <asm/udbg.h>
  42 #include <sysdev/fsl_soc.h>
  43 #include <asm/of_platform.h>
  44
  45 #include <asm/mpc52xx.h>
  46
  47 /* ************************************************************************
  48  *
  49  * Setup the architecture
  50  *
  51  */
  52
  53 static void __init
  54 lite5200_setup_cpu(void)
  55 {
  56         struct mpc52xx_gpio __iomem *gpio;
  57         u32 port_config;
  58
  59         /* Map zones */
  60         gpio = mpc52xx_find_and_map("mpc5200-gpio");
  61         if (!gpio) {
  62                 printk(KERN_ERR __FILE__ ": "
  63                         "Error while mapping GPIO register for port config. "
  64                         "Expect some abnormal behavior\n");
  65                 goto error;
  66         }
  67
  68         /* Set port config */
  69         port_config = in_be32(&gpio->port_config);
  70
  71         port_config &= ~0x00800000;     /* 48Mhz internal, pin is GPIO  */
  72
  73         port_config &= ~0x00007000;     /* USB port : Differential mode */
  74         port_config |=  0x00001000;     /*            USB 1 only        */
  75
  76         port_config &= ~0x03000000;     /* ATA CS is on csb_4/5         */
  77         port_config |=  0x01000000;
  78
  79         pr_debug("port_config: old:%x new:%x\n",
  80                  in_be32(&gpio->port_config), port_config);
  81         out_be32(&gpio->port_config, port_config);
  82
  83         /* Unmap zone */
  84 error:
  85         iounmap(gpio);
  86 }
  87
  88 #ifdef CONFIG_PM
  89 static u32 descr_a;
  90 static void lite5200_suspend_prepare(void __iomem *mbar)
  91 {
  92         u8 pin = 1;     /* GPIO_WKUP_1 (GPIO_PSC2_4) */
  93         u8 level = 0;   /* wakeup on low level */
  94         mpc52xx_set_wakeup_gpio(pin, level);
  95
  96         /*
  97          * power down usb port
  98          * this needs to be called before of-ohci suspend code
  99          */
 100         descr_a = in_be32(mbar + 0x1048);
 101         out_be32(mbar + 0x1048, (descr_a & ~0x200) | 0x100);
 102 }
 103
 104 static void lite5200_resume_finish(void __iomem *mbar)
 105 {
 106         out_be32(mbar + 0x1048, descr_a);
 107 }
 108 #endif
 109
 110 static void __init lite5200_setup_arch(void)
 111 {
 112         struct device_node *np;
 113
 114         if (ppc_md.progress)
 115                 ppc_md.progress("lite5200_setup_arch()", 0);
 116
 117         np = of_find_node_by_type(NULL, "cpu");
 118         if (np) {
 119                 const unsigned int *fp =
 120                         of_get_property(np, "clock-frequency", NULL);
 121                 if (fp != 0)
 122                         loops_per_jiffy = *fp / HZ;
 123                 else
 124                         loops_per_jiffy = 50000000 / HZ;
 125                 of_node_put(np);
 126         }
 127
 128         /* CPU & Port mux setup */
 129         mpc52xx_setup_cpu();    /* Generic */
 130         lite5200_setup_cpu();   /* Platorm specific */
 131
 132 #ifdef CONFIG_PM
 133         mpc52xx_suspend.board_suspend_prepare = lite5200_suspend_prepare;
 134         mpc52xx_suspend.board_resume_finish = lite5200_resume_finish;
 135         mpc52xx_pm_init();
 136 #endif
 137
 138 #ifdef CONFIG_PCI
 139         np = of_find_node_by_type(NULL, "pci");
 140         if (np) {
 141                 mpc52xx_add_bridge(np);
 142                 of_node_put(np);
 143         }
 144 #endif
 145
 146 #ifdef CONFIG_BLK_DEV_INITRD
 147         if (initrd_start)
 148                 ROOT_DEV = Root_RAM0;
 149         else
 150 #endif
 151 #ifdef  CONFIG_ROOT_NFS
 152                 ROOT_DEV = Root_NFS;
 153 #else
 154                 ROOT_DEV = Root_HDA1;
 155 #endif
 156
 157 }
 158
 159 void lite5200_show_cpuinfo(struct seq_file *m)
 160 {
 161         struct device_node* np = of_find_all_nodes(NULL);
 162         const char *model = NULL;
 163
 164         if (np)
 165                 model = of_get_property(np, "model", NULL);
 166
 167         seq_printf(m, "vendor\t\t:      Freescale Semiconductor\n");
 168         seq_printf(m, "machine\t\t:     %s\n", model ? model : "unknown");
 169
 170         of_node_put(np);
 171 }
 172
 173 /*
 174  * Called very early, MMU is off, device-tree isn't unflattened
 175  */
 176 static int __init lite5200_probe(void)
 177 {
 178         unsigned long node = of_get_flat_dt_root();
 179         const char *model = of_get_flat_dt_prop(node, "model", NULL);
 180
 181         if (!of_flat_dt_is_compatible(node, "fsl,lite5200") &&
 182             !of_flat_dt_is_compatible(node, "fsl,lite5200b"))
 183                 return 0;
 184         pr_debug("%s board found\n", model ? model : "unknown");
 185
 186         return 1;
 187 }
 188
 189 define_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         .show_cpuinfo   = lite5200_show_cpuinfo,
 197         .calibrate_decr = generic_calibrate_decr,
 198 };