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/rt305x.h>
  24 #include <asm/mach-ralink/rt305x_regs.h>
  25
  26 #include "machine.h"
  27
  28 enum rt305x_mach_type rt305x_mach;
  29
  30 static void rt305x_restart(char *command)
  31 {
  32         rt305x_sysc_wr(RT305X_RESET_SYSTEM, SYSC_REG_RESET_CTRL);
  33         while (1)
  34                 if (cpu_wait)
  35                         cpu_wait();
  36 }
  37
  38 static void rt305x_halt(void)
  39 {
  40         while (1)
  41                 if (cpu_wait)
  42                         cpu_wait();
  43 }
  44
  45 static void __init rt305x_detect_mem_size(void)
  46 {
  47         unsigned long size;
  48
  49         for (size = RT305X_MEM_SIZE_MIN; size < RT305X_MEM_SIZE_MAX;
  50              size <<= 1 ) {
  51                 if (!memcmp(rt305x_detect_mem_size,
  52                             rt305x_detect_mem_size + size, 1024))
  53                         break;
  54         }
  55
  56         add_memory_region(RT305X_SDRAM_BASE, size, BOOT_MEM_RAM);
  57 }
  58
  59 static void __init rt305x_early_serial_setup(void)
  60 {
  61         struct uart_port p;
  62         int err;
  63
  64         memset(&p, 0, sizeof(p));
  65         p.flags         = UPF_SKIP_TEST;
  66         p.iotype        = UPIO_AU;
  67         p.uartclk       = rt305x_sys_freq;
  68         p.regshift      = 2;
  69         p.type          = PORT_16550A;
  70
  71         p.mapbase       = RT305X_UART0_BASE;
  72         p.membase       = ioremap_nocache(p.mapbase, RT305X_UART0_SIZE);
  73         p.line          = 0;
  74         p.irq           = RT305X_INTC_IRQ_UART0;
  75
  76         err = early_serial_setup(&p);
  77         if (err)
  78                 printk(KERN_ERR "RT305x: early UART0 registration failed %d\n",
  79                         err);
  80
  81         p.mapbase       = RT305X_UART1_BASE;
  82         p.membase       = ioremap_nocache(p.mapbase, RT305X_UART1_SIZE);
  83         p.line          = 1;
  84         p.irq           = RT305X_INTC_IRQ_UART1;
  85
  86         err = early_serial_setup(&p);
  87         if (err)
  88                 printk(KERN_ERR "RT305x: early UART1 registration failed %d\n",
  89                         err);
  90 }
  91
  92 const char *get_system_type(void)
  93 {
  94         return rt305x_sys_type;
  95 }
  96
  97 unsigned int __cpuinit get_c0_compare_irq(void)
  98 {
  99         return CP0_LEGACY_COMPARE_IRQ;
 100 }
 101
 102 void __init plat_mem_setup(void)
 103 {
 104         set_io_port_base(KSEG1);
 105
 106         rt305x_intc_base = ioremap_nocache(RT305X_INTC_BASE, PAGE_SIZE);
 107         rt305x_sysc_base = ioremap_nocache(RT305X_SYSC_BASE, PAGE_SIZE);
 108         rt305x_memc_base = ioremap_nocache(RT305X_MEMC_BASE, PAGE_SIZE);
 109
 110         rt305x_detect_mem_size();
 111         rt305x_detect_sys_type();
 112         rt305x_detect_sys_freq();
 113
 114         printk(KERN_INFO "%s running at %lu.%02lu MHz\n", get_system_type(),
 115                 rt305x_cpu_freq / 1000000,
 116                 (rt305x_cpu_freq % 1000000) * 100 / 1000000);
 117
 118         _machine_restart = rt305x_restart;
 119         _machine_halt = rt305x_halt;
 120         pm_power_off = rt305x_halt;
 121
 122         rt305x_early_serial_setup();
 123 }
 124
 125 void __init plat_time_init(void)
 126 {
 127         mips_hpt_frequency = rt305x_cpu_freq / 2;
 128 }
 129
 130 static int __init rt305x_machine_setup(void)
 131 {
 132         mips_machine_setup(rt305x_mach);
 133
 134         return 0;
 135 }
 136
 137 arch_initcall(rt305x_machine_setup);