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/bootinfo.h>
  20 #include <asm/mips_machine.h>
  21 #include <asm/reboot.h>
  22 #include <asm/time.h>
  23
  24 #include <asm/mach-ralink/rt288x.h>
  25 #include <asm/mach-ralink/rt288x_regs.h>
  26
  27 #define RT288X_MEM_SIZE_MIN (2 * 1024 * 1024)
  28 #define RT288X_MEM_SIZE_MAX (128 * 1024 * 1024)
  29
  30 unsigned long rt288x_mach_type;
  31
  32 static void rt288x_restart(char *command)
  33 {
  34         rt288x_sysc_wr(RT2880_RESET_SYSTEM, SYSC_REG_RESET_CTRL);
  35         while (1)
  36                 if (cpu_wait)
  37                         cpu_wait();
  38 }
  39
  40 static void rt288x_halt(void)
  41 {
  42         while (1)
  43                 cpu_wait();
  44 }
  45
  46 static void __init rt288x_detect_mem_size(void)
  47 {
  48         unsigned long size;
  49
  50         for (size = RT288X_MEM_SIZE_MIN; size < RT288X_MEM_SIZE_MAX;
  51              size <<= 1 ) {
  52                 if (!memcmp(rt288x_detect_mem_size,
  53                             rt288x_detect_mem_size + size, 1024))
  54                         break;
  55         }
  56
  57         add_memory_region(RT2880_SDRAM_BASE, size, BOOT_MEM_RAM);
  58 }
  59
  60 static void __init rt288x_early_serial_setup(void)
  61 {
  62         struct uart_port p;
  63         int err;
  64
  65         memset(&p, 0, sizeof(p));
  66         p.flags         = UPF_SKIP_TEST;
  67         p.iotype        = UPIO_AU;
  68         p.uartclk       = rt288x_sys_freq;
  69         p.regshift      = 2;
  70         p.type          = PORT_16550A;
  71
  72         p.mapbase       = RT2880_UART0_BASE;
  73         p.membase       = ioremap_nocache(p.mapbase, RT2880_UART0_SIZE);
  74         p.line          = 0;
  75         p.irq           = RT2880_INTC_IRQ_UART0;
  76
  77         err = early_serial_setup(&p);
  78         if (err)
  79                 printk(KERN_ERR "RT288x: early UART0 registration failed %d\n",
  80                         err);
  81
  82         p.mapbase       = RT2880_UART1_BASE;
  83         p.membase       = ioremap_nocache(p.mapbase, RT2880_UART1_SIZE);
  84         p.line          = 1;
  85         p.irq           = RT2880_INTC_IRQ_UART1;
  86
  87         err = early_serial_setup(&p);
  88         if (err)
  89                 printk(KERN_ERR "RT288x: early UART1 registration failed %d\n",
  90                         err);
  91 }
  92
  93 const char *get_system_type(void)
  94 {
  95         return rt288x_sys_type;
  96 }
  97
  98 unsigned int __cpuinit get_c0_compare_irq(void)
  99 {
 100         return CP0_LEGACY_COMPARE_IRQ;
 101 }
 102
 103 void __init plat_mem_setup(void)
 104 {
 105         set_io_port_base(KSEG1);
 106
 107         rt288x_sysc_base = ioremap_nocache(RT2880_SYSC_BASE, RT2880_SYSC_SIZE);
 108         rt288x_memc_base = ioremap_nocache(RT2880_MEMC_BASE, RT2880_MEMC_SIZE);
 109
 110         rt288x_detect_mem_size();
 111         rt288x_detect_sys_type();
 112         rt288x_detect_sys_freq();
 113
 114         printk(KERN_INFO "%s running at %lu.%02lu MHz\n", get_system_type(),
 115                 rt288x_cpu_freq / 1000000,
 116                 (rt288x_cpu_freq % 1000000) * 100 / 1000000);
 117
 118         _machine_restart = rt288x_restart;
 119         _machine_halt = rt288x_halt;
 120         pm_power_off = rt288x_halt;
 121
 122         rt288x_early_serial_setup();
 123 }
 124
 125 void __init plat_time_init(void)
 126 {
 127         mips_hpt_frequency = rt288x_cpu_freq / 2;
 128 }
 129
 130 static int __init rt288x_machine_setup(void)
 131 {
 132         mips_machine_setup(rt288x_mach_type);
 133
 134         return 0;
 135 }
 136
 137 arch_initcall(rt288x_machine_setup);