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/mips_machine.h>
  19 #include <asm/reboot.h>
  20 #include <asm/time.h>
  21
  22 #include <asm/mach-ralink/common.h>
  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_early_serial_setup(void)
  46 {
  47         struct uart_port p;
  48         int err;
  49
  50         memset(&p, 0, sizeof(p));
  51         p.flags         = UPF_SKIP_TEST;
  52         p.iotype        = UPIO_AU;
  53         p.uartclk       = rt305x_sys_freq;
  54         p.regshift      = 2;
  55         p.type          = PORT_16550A;
  56
  57         p.mapbase       = RT305X_UART0_BASE;
  58         p.membase       = ioremap_nocache(p.mapbase, RT305X_UART0_SIZE);
  59         p.line          = 0;
  60         p.irq           = RT305X_INTC_IRQ_UART0;
  61
  62         err = early_serial_setup(&p);
  63         if (err)
  64                 printk(KERN_ERR "RT305x: early UART0 registration failed %d\n",
  65                         err);
  66
  67         p.mapbase       = RT305X_UART1_BASE;
  68         p.membase       = ioremap_nocache(p.mapbase, RT305X_UART1_SIZE);
  69         p.line          = 1;
  70         p.irq           = RT305X_INTC_IRQ_UART1;
  71
  72         err = early_serial_setup(&p);
  73         if (err)
  74                 printk(KERN_ERR "RT305x: early UART1 registration failed %d\n",
  75                         err);
  76 }
  77
  78 unsigned int __cpuinit get_c0_compare_irq(void)
  79 {
  80         return CP0_LEGACY_COMPARE_IRQ;
  81 }
  82
  83 void __init ramips_soc_setup(void)
  84 {
  85         rt305x_sysc_base = ioremap_nocache(RT305X_SYSC_BASE, PAGE_SIZE);
  86         rt305x_memc_base = ioremap_nocache(RT305X_MEMC_BASE, PAGE_SIZE);
  87
  88         rt305x_detect_sys_type();
  89         rt305x_detect_sys_freq();
  90
  91         printk(KERN_INFO "%s running at %lu.%02lu MHz\n", ramips_sys_type,
  92                 rt305x_cpu_freq / 1000000,
  93                 (rt305x_cpu_freq % 1000000) * 100 / 1000000);
  94
  95         _machine_restart = rt305x_restart;
  96         _machine_halt = rt305x_halt;
  97         pm_power_off = rt305x_halt;
  98
  99         rt305x_early_serial_setup();
 100 }
 101
 102 void __init plat_time_init(void)
 103 {
 104         mips_hpt_frequency = rt305x_cpu_freq / 2;
 105 }
 106
 107 static int __init rt305x_machine_setup(void)
 108 {
 109         mips_machine_setup(rt305x_mach);
 110
 111         return 0;
 112 }
 113
 114 arch_initcall(rt305x_machine_setup);