2 * Ralink RT288x SoC specific setup
4 * Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
7 * Parts of this file are based on Ralink's 2.6.21 BSP
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.
14 #include <linux/kernel.h>
15 #include <linux/init.h>
17 #include <linux/serial_8250.h>
19 #include <asm/bootinfo.h>
20 #include <asm/mips_machine.h>
21 #include <asm/reboot.h>
24 #include <asm/mach-ralink/rt288x.h>
25 #include <asm/mach-ralink/rt288x_regs.h>
27 #define RT288X_MEM_SIZE_MIN (2 * 1024 * 1024)
28 #define RT288X_MEM_SIZE_MAX (128 * 1024 * 1024)
30 unsigned long rt288x_mach_type;
32 static void rt288x_restart(char *command)
34 rt288x_sysc_wr(RT2880_RESET_SYSTEM, SYSC_REG_RESET_CTRL);
40 static void rt288x_halt(void)
46 static void __init rt288x_detect_mem_size(void)
50 for (size = RT288X_MEM_SIZE_MIN; size < RT288X_MEM_SIZE_MAX;
52 if (!memcmp(rt288x_detect_mem_size,
53 rt288x_detect_mem_size + size, 1024))
57 add_memory_region(RT2880_SDRAM_BASE, size, BOOT_MEM_RAM);
60 #ifdef CONFIG_RT288X_EARLY_SERIAL
61 static void __init rt288x_early_serial_setup(void)
66 memset(&p, 0, sizeof(p));
67 p.flags = UPF_SKIP_TEST;
69 p.uartclk = rt288x_sys_freq;
73 p.mapbase = RT2880_UART0_BASE;
74 p.membase = ioremap_nocache(p.mapbase, RT2880_UART0_SIZE);
76 p.irq = RT2880_INTC_IRQ_UART0;
78 err = early_serial_setup(&p);
80 printk(KERN_ERR "RT288x: early UART0 registration failed %d\n",
83 p.mapbase = RT2880_UART1_BASE;
84 p.membase = ioremap_nocache(p.mapbase, RT2880_UART1_SIZE);
86 p.irq = RT2880_INTC_IRQ_UART1;
88 err = early_serial_setup(&p);
90 printk(KERN_ERR "RT288x: early UART1 registration failed %d\n",
94 static inline void rt288x_early_serial_setup(void) {};
95 #endif /* CONFIG_RT288X_EARLY_SERIAL */
97 const char *get_system_type(void)
99 return rt288x_sys_type;
102 unsigned int __cpuinit get_c0_compare_irq(void)
104 return CP0_LEGACY_COMPARE_IRQ;
107 void __init plat_mem_setup(void)
109 set_io_port_base(KSEG1);
111 rt288x_intc_base = ioremap_nocache(RT2880_INTC_BASE, RT2880_INTC_SIZE);
112 rt288x_sysc_base = ioremap_nocache(RT2880_SYSC_BASE, RT2880_SYSC_SIZE);
113 rt288x_memc_base = ioremap_nocache(RT2880_MEMC_BASE, RT2880_MEMC_SIZE);
115 rt288x_detect_mem_size();
116 rt288x_detect_sys_type();
117 rt288x_detect_sys_freq();
119 printk(KERN_INFO "%s running at %lu.%02lu MHz\n", get_system_type(),
120 rt288x_cpu_freq / 1000000,
121 (rt288x_cpu_freq % 1000000) * 100 / 1000000);
123 _machine_restart = rt288x_restart;
124 _machine_halt = rt288x_halt;
125 pm_power_off = rt288x_halt;
127 rt288x_early_serial_setup();
130 void __init plat_time_init(void)
132 mips_hpt_frequency = rt288x_cpu_freq / 2;
135 static int __init rt288x_machine_setup(void)
137 mips_machine_setup(rt288x_mach_type);
142 arch_initcall(rt288x_machine_setup);