release/src-rt-6.x/linux/linux-2.6/arch/powerpc/platforms/82xx/mpc82xx.c

   1 /*
   2  * MPC82xx setup and early boot code plus other random bits.
   3  *
   4  * Author: Vitaly Bordug <vbordug@ru.mvista.com>
   5  *
   6  * Copyright (c) 2006 MontaVista Software, Inc.
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  */
  13
  14 #include <linux/stddef.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/errno.h>
  18 #include <linux/reboot.h>
  19 #include <linux/pci.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/kdev_t.h>
  22 #include <linux/major.h>
  23 #include <linux/console.h>
  24 #include <linux/delay.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/root_dev.h>
  27 #include <linux/initrd.h>
  28 #include <linux/module.h>
  29 #include <linux/fsl_devices.h>
  30 #include <linux/fs_uart_pd.h>
  31
  32 #include <asm/system.h>
  33 #include <asm/pgtable.h>
  34 #include <asm/page.h>
  35 #include <asm/atomic.h>
  36 #include <asm/time.h>
  37 #include <asm/io.h>
  38 #include <asm/machdep.h>
  39 #include <asm/bootinfo.h>
  40 #include <asm/pci-bridge.h>
  41 #include <asm/mpc8260.h>
  42 #include <asm/irq.h>
  43 #include <mm/mmu_decl.h>
  44 #include <asm/prom.h>
  45 #include <asm/cpm2.h>
  46 #include <asm/udbg.h>
  47 #include <asm/i8259.h>
  48 #include <linux/fs_enet_pd.h>
  49
  50 #include <sysdev/fsl_soc.h>
  51 #include <sysdev/cpm2_pic.h>
  52
  53 #include "pq2ads.h"
  54
  55 static int __init get_freq(char *name, unsigned long *val)
  56 {
  57         struct device_node *cpu;
  58         const unsigned int *fp;
  59         int found = 0;
  60
  61         /* The cpu node should have timebase and clock frequency properties */
  62         cpu = of_find_node_by_type(NULL, "cpu");
  63
  64         if (cpu) {
  65                 fp = of_get_property(cpu, name, NULL);
  66                 if (fp) {
  67                         found = 1;
  68                         *val = *fp;
  69                 }
  70
  71                 of_node_put(cpu);
  72         }
  73
  74         return found;
  75 }
  76
  77 void __init m82xx_calibrate_decr(void)
  78 {
  79         ppc_tb_freq = 125000000;
  80         if (!get_freq("bus-frequency", &ppc_tb_freq)) {
  81                 printk(KERN_ERR "WARNING: Estimating decrementer frequency "
  82                                 "(not found)\n");
  83         }
  84         ppc_tb_freq /= 4;
  85         ppc_proc_freq = 1000000000;
  86         if (!get_freq("clock-frequency", &ppc_proc_freq))
  87                 printk(KERN_ERR "WARNING: Estimating processor frequency"
  88                                 "(not found)\n");
  89 }
  90
  91 void mpc82xx_ads_show_cpuinfo(struct seq_file *m)
  92 {
  93         uint pvid, svid, phid1;
  94         uint memsize = total_memory;
  95
  96         pvid = mfspr(SPRN_PVR);
  97         svid = mfspr(SPRN_SVR);
  98
  99         seq_printf(m, "Vendor\t\t: Freescale Semiconductor\n");
 100         seq_printf(m, "Machine\t\t: %s\n", CPUINFO_MACHINE);
 101         seq_printf(m, "PVR\t\t: 0x%x\n", pvid);
 102         seq_printf(m, "SVR\t\t: 0x%x\n", svid);
 103
 104         /* Display cpu Pll setting */
 105         phid1 = mfspr(SPRN_HID1);
 106         seq_printf(m, "PLL setting\t: 0x%x\n", ((phid1 >> 24) & 0x3f));
 107
 108         /* Display the amount of memory */
 109         seq_printf(m, "Memory\t\t: %d MB\n", memsize / (1024 * 1024));
 110 }