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