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 #include <linux/err.h>
  18 #include <linux/clk.h>
  19
  20 #include <asm/mips_machine.h>
  21 #include <asm/reboot.h>
  22 #include <asm/time.h>
  23
  24 #include <asm/mach-ralink/common.h>
  25 #include <asm/mach-ralink/rt288x.h>
  26 #include <asm/mach-ralink/rt288x_regs.h>
  27 #include "common.h"
  28
  29 static void rt288x_restart(char *command)
  30 {
  31         rt288x_sysc_wr(RT2880_RESET_SYSTEM, SYSC_REG_RESET_CTRL);
  32         while (1)
  33                 if (cpu_wait)
  34                         cpu_wait();
  35 }
  36
  37 static void rt288x_halt(void)
  38 {
  39         while (1)
  40                 cpu_wait();
  41 }
  42
  43 unsigned int __cpuinit get_c0_compare_irq(void)
  44 {
  45         return CP0_LEGACY_COMPARE_IRQ;
  46 }
  47
  48 void __init ramips_soc_setup(void)
  49 {
  50         struct clk *clk;
  51
  52         rt288x_sysc_base = ioremap_nocache(RT2880_SYSC_BASE, RT2880_SYSC_SIZE);
  53         rt288x_memc_base = ioremap_nocache(RT2880_MEMC_BASE, RT2880_MEMC_SIZE);
  54
  55         rt288x_clocks_init();
  56
  57         clk = clk_get(NULL, "cpu");
  58         if (IS_ERR(clk))
  59                 panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));
  60
  61         printk(KERN_INFO "%s running at %lu.%02lu MHz\n", ramips_sys_type,
  62                 clk_get_rate(clk) / 1000000,
  63                 (clk_get_rate(clk) % 1000000) * 100 / 1000000);
  64
  65         _machine_restart = rt288x_restart;
  66         _machine_halt = rt288x_halt;
  67         pm_power_off = rt288x_halt;
  68
  69         clk = clk_get(NULL, "uart");
  70         if (IS_ERR(clk))
  71                 panic("unable to get UART clock, err=%ld", PTR_ERR(clk));
  72
  73         ramips_early_serial_setup(0, RT2880_UART0_BASE, clk_get_rate(clk),
  74                                   RT2880_INTC_IRQ_UART0);
  75         ramips_early_serial_setup(1, RT2880_UART1_BASE, clk_get_rate(clk),
  76                                   RT2880_INTC_IRQ_UART1);
  77 }
  78
  79 void __init plat_time_init(void)
  80 {
  81         struct clk *clk;
  82
  83         clk = clk_get(NULL, "cpu");
  84         if (IS_ERR(clk))
  85                 panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));
  86
  87         mips_hpt_frequency = clk_get_rate(clk) / 2;
  88 }