target/linux/ramips/files/arch/mips/ralink/rt288x/setup.c

   1 /*
   2  * Ralink RT288x SoC specific setup
   3  *
   4  * Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
   5  * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   6  *
   7  * Parts of this file are based on Ralink's 2.6.21 BSP
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License version 2 as published
  11  * by the Free Software Foundation.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/io.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/rt288x.h>
  24 #include <asm/mach-ralink/rt288x_regs.h>
  25
  26 static void rt288x_restart(char *command)
  27 {
  28         rt288x_sysc_wr(RT2880_RESET_SYSTEM, SYSC_REG_RESET_CTRL);
  29         while (1)
  30                 if (cpu_wait)
  31                         cpu_wait();
  32 }
  33
  34 static void rt288x_halt(void)
  35 {
  36         while (1)
  37                 cpu_wait();
  38 }
  39
  40 unsigned int __cpuinit get_c0_compare_irq(void)
  41 {
  42         return CP0_LEGACY_COMPARE_IRQ;
  43 }
  44
  45 void __init ramips_soc_setup(void)
  46 {
  47         rt288x_sysc_base = ioremap_nocache(RT2880_SYSC_BASE, RT2880_SYSC_SIZE);
  48         rt288x_memc_base = ioremap_nocache(RT2880_MEMC_BASE, RT2880_MEMC_SIZE);
  49
  50         rt288x_detect_sys_type();
  51         rt288x_detect_sys_freq();
  52
  53         printk(KERN_INFO "%s running at %lu.%02lu MHz\n", ramips_sys_type,
  54                 rt288x_cpu_freq / 1000000,
  55                 (rt288x_cpu_freq % 1000000) * 100 / 1000000);
  56
  57         _machine_restart = rt288x_restart;
  58         _machine_halt = rt288x_halt;
  59         pm_power_off = rt288x_halt;
  60
  61         ramips_early_serial_setup(0, RT2880_UART0_BASE, rt288x_sys_freq,
  62                                   RT2880_INTC_IRQ_UART0);
  63         ramips_early_serial_setup(1, RT2880_UART1_BASE, rt288x_sys_freq,
  64                                   RT2880_INTC_IRQ_UART1);
  65 }
  66
  67 void __init plat_time_init(void)
  68 {
  69         mips_hpt_frequency = rt288x_cpu_freq / 2;
  70 }