target/linux/ramips/files/arch/mips/ralink/rt305x/setup.c

   1 /*
   2  * Ralink RT305x SoC specific setup
   3  *
   4  * Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  * Parts of this file are based on Ralink's 2.6.21 BSP
   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 version 2 as published
  10  * by the Free Software Foundation.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/io.h>
  16 #include <linux/serial_8250.h>
  17
  18 #include <asm/bootinfo.h>
  19 #include <asm/mips_machine.h>
  20 #include <asm/reboot.h>
  21 #include <asm/time.h>
  22
  23 #include <asm/mach-ralink/common.h>
  24 #include <asm/mach-ralink/rt305x.h>
  25 #include <asm/mach-ralink/rt305x_regs.h>
  26
  27 #include "machine.h"
  28
  29 enum rt305x_mach_type rt305x_mach;
  30
  31 static void rt305x_restart(char *command)
  32 {
  33         rt305x_sysc_wr(RT305X_RESET_SYSTEM, SYSC_REG_RESET_CTRL);
  34         while (1)
  35                 if (cpu_wait)
  36                         cpu_wait();
  37 }
  38
  39 static void rt305x_halt(void)
  40 {
  41         while (1)
  42                 if (cpu_wait)
  43                         cpu_wait();
  44 }
  45
  46 static void __init rt305x_detect_mem_size(void)
  47 {
  48         unsigned long size;
  49
  50         for (size = RT305X_MEM_SIZE_MIN; size < RT305X_MEM_SIZE_MAX;
  51              size <<= 1 ) {
  52                 if (!memcmp(rt305x_detect_mem_size,
  53                             rt305x_detect_mem_size + size, 1024))
  54                         break;
  55         }
  56
  57         add_memory_region(RT305X_SDRAM_BASE, size, BOOT_MEM_RAM);
  58 }
  59
  60 static void __init rt305x_early_serial_setup(void)
  61 {
  62         struct uart_port p;
  63         int err;
  64
  65         memset(&p, 0, sizeof(p));
  66         p.flags         = UPF_SKIP_TEST;
  67         p.iotype        = UPIO_AU;
  68         p.uartclk       = rt305x_sys_freq;
  69         p.regshift      = 2;
  70         p.type          = PORT_16550A;
  71
  72         p.mapbase       = RT305X_UART0_BASE;
  73         p.membase       = ioremap_nocache(p.mapbase, RT305X_UART0_SIZE);
  74         p.line          = 0;
  75         p.irq           = RT305X_INTC_IRQ_UART0;
  76
  77         err = early_serial_setup(&p);
  78         if (err)
  79                 printk(KERN_ERR "RT305x: early UART0 registration failed %d\n",
  80                         err);
  81
  82         p.mapbase       = RT305X_UART1_BASE;
  83         p.membase       = ioremap_nocache(p.mapbase, RT305X_UART1_SIZE);
  84         p.line          = 1;
  85         p.irq           = RT305X_INTC_IRQ_UART1;
  86
  87         err = early_serial_setup(&p);
  88         if (err)
  89                 printk(KERN_ERR "RT305x: early UART1 registration failed %d\n",
  90                         err);
  91 }
  92
  93 const char *get_system_type(void)
  94 {
  95         return rt305x_sys_type;
  96 }
  97
  98 unsigned int __cpuinit get_c0_compare_irq(void)
  99 {
 100         return CP0_LEGACY_COMPARE_IRQ;
 101 }
 102
 103 void __init ramips_soc_setup(void)
 104 {
 105         rt305x_sysc_base = ioremap_nocache(RT305X_SYSC_BASE, PAGE_SIZE);
 106         rt305x_memc_base = ioremap_nocache(RT305X_MEMC_BASE, PAGE_SIZE);
 107
 108         rt305x_detect_mem_size();
 109         rt305x_detect_sys_type();
 110         rt305x_detect_sys_freq();
 111
 112         printk(KERN_INFO "%s running at %lu.%02lu MHz\n", get_system_type(),
 113                 rt305x_cpu_freq / 1000000,
 114                 (rt305x_cpu_freq % 1000000) * 100 / 1000000);
 115
 116         _machine_restart = rt305x_restart;
 117         _machine_halt = rt305x_halt;
 118         pm_power_off = rt305x_halt;
 119
 120         rt305x_early_serial_setup();
 121 }
 122
 123 void __init plat_time_init(void)
 124 {
 125         mips_hpt_frequency = rt305x_cpu_freq / 2;
 126 }
 127
 128 static int __init rt305x_machine_setup(void)
 129 {
 130         mips_machine_setup(rt305x_mach);
 131
 132         return 0;
 133 }
 134
 135 arch_initcall(rt305x_machine_setup);