target/linux/ramips/files/arch/mips/ralink/rt3883/setup.c

   1 /*
   2  * Ralink RT3662/RT3883 SoC specific setup
   3  *
   4  * Copyright (C) 2011-2012 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/err.h>
  17 #include <linux/clk.h>
  18
  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/rt3883.h>
  25 #include <asm/mach-ralink/rt3883_regs.h>
  26 #include "common.h"
  27
  28 static void rt3883_restart(char *command)
  29 {
  30         rt3883_sysc_wr(RT3883_RSTCTRL_SYS, RT3883_SYSC_REG_RSTCTRL);
  31         while (1)
  32                 if (cpu_wait)
  33                         cpu_wait();
  34 }
  35
  36 static void rt3883_halt(void)
  37 {
  38         while (1)
  39                 if (cpu_wait)
  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         rt3883_sysc_base = ioremap_nocache(RT3883_SYSC_BASE, PAGE_SIZE);
  53         rt3883_memc_base = ioremap_nocache(RT3883_MEMC_BASE, PAGE_SIZE);
  54
  55         rt3883_detect_sys_type();
  56         rt3883_clocks_init();
  57
  58         clk = clk_get(NULL, "cpu");
  59         if (IS_ERR(clk))
  60                 panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));
  61
  62         printk(KERN_INFO "%s running at %lu.%02lu MHz\n", ramips_sys_type,
  63                 clk_get_rate(clk) / 1000000,
  64                 (clk_get_rate(clk) % 1000000) * 100 / 1000000);
  65
  66         _machine_restart = rt3883_restart;
  67         _machine_halt = rt3883_halt;
  68         pm_power_off = rt3883_halt;
  69
  70         clk = clk_get(NULL, "uart");
  71         if (IS_ERR(clk))
  72                 panic("unable to get UART clock, err=%ld", PTR_ERR(clk));
  73
  74         ramips_early_serial_setup(0, RT3883_UART0_BASE, clk_get_rate(clk),
  75                                   RT3883_INTC_IRQ_UART0);
  76         ramips_early_serial_setup(1, RT3883_UART1_BASE, clk_get_rate(clk),
  77                                   RT3883_INTC_IRQ_UART1);
  78 }
  79
  80 void __init plat_time_init(void)
  81 {
  82         struct clk *clk;
  83
  84         clk = clk_get(NULL, "cpu");
  85         if (IS_ERR(clk))
  86                 panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));
  87
  88         mips_hpt_frequency = clk_get_rate(clk) / 2;
  89 }