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/serial_8250.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/rt288x.h>
  25 #include <asm/mach-ralink/rt288x_regs.h>
  26
  27 unsigned long rt288x_mach_type;
  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 static void __init rt288x_early_serial_setup(void)
  44 {
  45         struct uart_port p;
  46         int err;
  47
  48         memset(&p, 0, sizeof(p));
  49         p.flags         = UPF_SKIP_TEST;
  50         p.iotype        = UPIO_AU;
  51         p.uartclk       = rt288x_sys_freq;
  52         p.regshift      = 2;
  53         p.type          = PORT_16550A;
  54
  55         p.mapbase       = RT2880_UART0_BASE;
  56         p.membase       = ioremap_nocache(p.mapbase, RT2880_UART0_SIZE);
  57         p.line          = 0;
  58         p.irq           = RT2880_INTC_IRQ_UART0;
  59
  60         err = early_serial_setup(&p);
  61         if (err)
  62                 printk(KERN_ERR "RT288x: early UART0 registration failed %d\n",
  63                         err);
  64
  65         p.mapbase       = RT2880_UART1_BASE;
  66         p.membase       = ioremap_nocache(p.mapbase, RT2880_UART1_SIZE);
  67         p.line          = 1;
  68         p.irq           = RT2880_INTC_IRQ_UART1;
  69
  70         err = early_serial_setup(&p);
  71         if (err)
  72                 printk(KERN_ERR "RT288x: early UART1 registration failed %d\n",
  73                         err);
  74 }
  75
  76 unsigned int __cpuinit get_c0_compare_irq(void)
  77 {
  78         return CP0_LEGACY_COMPARE_IRQ;
  79 }
  80
  81 void __init ramips_soc_setup(void)
  82 {
  83         rt288x_sysc_base = ioremap_nocache(RT2880_SYSC_BASE, RT2880_SYSC_SIZE);
  84         rt288x_memc_base = ioremap_nocache(RT2880_MEMC_BASE, RT2880_MEMC_SIZE);
  85
  86         rt288x_detect_sys_type();
  87         rt288x_detect_sys_freq();
  88
  89         printk(KERN_INFO "%s running at %lu.%02lu MHz\n", ramips_sys_type,
  90                 rt288x_cpu_freq / 1000000,
  91                 (rt288x_cpu_freq % 1000000) * 100 / 1000000);
  92
  93         _machine_restart = rt288x_restart;
  94         _machine_halt = rt288x_halt;
  95         pm_power_off = rt288x_halt;
  96
  97         rt288x_early_serial_setup();
  98 }
  99
 100 void __init plat_time_init(void)
 101 {
 102         mips_hpt_frequency = rt288x_cpu_freq / 2;
 103 }
 104
 105 static int __init rt288x_machine_setup(void)
 106 {
 107         mips_machine_setup(rt288x_mach_type);
 108
 109         return 0;
 110 }
 111
 112 arch_initcall(rt288x_machine_setup);