1. 根目录:
2. arch
3. mips
4. ralink
5. rt288x.c

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 *
 * Parts of this file are based on Ralink's 2.6.21 BSP
 *
 * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>

#include <asm/mipsregs.h>
#include <asm/mach-ralink/ralink_regs.h>
#include <asm/mach-ralink/rt288x.h>

#include "common.h"

static struct ralink_pinmux_grp mode_mux[] = {
	{
		.name = "i2c",
		.mask = RT2880_GPIO_MODE_I2C,
		.gpio_first = 1,
		.gpio_last = 2,
	}, {
		.name = "spi",
		.mask = RT2880_GPIO_MODE_SPI,
		.gpio_first = 3,
		.gpio_last = 6,
	}, {
		.name = "uartlite",
		.mask = RT2880_GPIO_MODE_UART0,
		.gpio_first = 7,
		.gpio_last = 14,
	}, {
		.name = "jtag",
		.mask = RT2880_GPIO_MODE_JTAG,
		.gpio_first = 17,
		.gpio_last = 21,
	}, {
		.name = "mdio",
		.mask = RT2880_GPIO_MODE_MDIO,
		.gpio_first = 22,
		.gpio_last = 23,
	}, {
		.name = "sdram",
		.mask = RT2880_GPIO_MODE_SDRAM,
		.gpio_first = 24,
		.gpio_last = 39,
	}, {
		.name = "pci",
		.mask = RT2880_GPIO_MODE_PCI,
		.gpio_first = 40,
		.gpio_last = 71,
	}, {0}
};

static void rt288x_wdt_reset(void)
{
	u32 t;

	/* enable WDT reset output on pin SRAM_CS_N */
	t = rt_sysc_r32(SYSC_REG_CLKCFG);
	t |= CLKCFG_SRAM_CS_N_WDT;
	rt_sysc_w32(t, SYSC_REG_CLKCFG);
}

struct ralink_pinmux rt_gpio_pinmux = {
	.mode = mode_mux,
	.wdt_reset = rt288x_wdt_reset,
};

void __init ralink_clk_init(void)
{
	unsigned long cpu_rate;
	u32 t = rt_sysc_r32(SYSC_REG_SYSTEM_CONFIG);
	t = ((t >> SYSTEM_CONFIG_CPUCLK_SHIFT) & SYSTEM_CONFIG_CPUCLK_MASK);

	switch (t) {
	case SYSTEM_CONFIG_CPUCLK_250:
		cpu_rate = 250000000;
		break;
	case SYSTEM_CONFIG_CPUCLK_266:
		cpu_rate = 266666667;
		break;
	case SYSTEM_CONFIG_CPUCLK_280:
		cpu_rate = 280000000;
		break;
	case SYSTEM_CONFIG_CPUCLK_300:
		cpu_rate = 300000000;
		break;
	}

	ralink_clk_add("cpu", cpu_rate);
	ralink_clk_add("300100.timer", cpu_rate / 2);
	ralink_clk_add("300120.watchdog", cpu_rate / 2);
	ralink_clk_add("300500.uart", cpu_rate / 2);
	ralink_clk_add("300c00.uartlite", cpu_rate / 2);
	ralink_clk_add("400000.ethernet", cpu_rate / 2);
}

void __init ralink_of_remap(void)
{
	rt_sysc_membase = plat_of_remap_node("ralink,rt2880-sysc");
	rt_memc_membase = plat_of_remap_node("ralink,rt2880-memc");

	if (!rt_sysc_membase || !rt_memc_membase)
		panic("Failed to remap core resources");
}

void prom_soc_init(struct ralink_soc_info *soc_info)
{
	void __iomem *sysc = (void __iomem *) KSEG1ADDR(RT2880_SYSC_BASE);
	const char *name;
	u32 n0;
	u32 n1;
	u32 id;

	n0 = __raw_readl(sysc + SYSC_REG_CHIP_NAME0);
	n1 = __raw_readl(sysc + SYSC_REG_CHIP_NAME1);
	id = __raw_readl(sysc + SYSC_REG_CHIP_ID);

	if (n0 == RT2880_CHIP_NAME0 && n1 == RT2880_CHIP_NAME1) {
		soc_info->compatible = "ralink,r2880-soc";
		name = "RT2880";
	} else {
		panic("rt288x: unknown SoC, n0:%08x n1:%08x", n0, n1);
	}

	snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN,
		"Ralink %s id:%u rev:%u",
		name,
		(id >> CHIP_ID_ID_SHIFT) & CHIP_ID_ID_MASK,
		(id & CHIP_ID_REV_MASK));

	soc_info->mem_base = RT2880_SDRAM_BASE;
	soc_info->mem_size_min = RT2880_MEM_SIZE_MIN;
	soc_info->mem_size_max = RT2880_MEM_SIZE_MAX;
}