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MIPS: ralink: adds support for RT2880 SoC family

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Add support code for rt2880 SOC.

The code detects the SoC and registers the clk / pinmux settings.

Signed-off-by: John Crispin <blogic@openwrt.org>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/5176/
This commit is contained in:
John Crispin 2013-01-27 09:17:20 +01:00 committed by Ralf Baechle
parent eb63875c28
commit 80fb55a951
6 changed files with 198 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/mips/Kconfig
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@ -1144,7 +1144,7 @@ config BOOT_ELF32
config MIPS_L1_CACHE_SHIFT
int
default "4" if MACH_DECSTATION || MIKROTIK_RB532 || PMC_MSP4200_EVAL
default "4" if MACH_DECSTATION || MIKROTIK_RB532 || PMC_MSP4200_EVAL || SOC_RT288X
default "6" if MIPS_CPU_SCACHE
default "7" if SGI_IP22 || SGI_IP27 || SGI_IP28 || SNI_RM || CPU_CAVIUM_OCTEON
default "5"

49
arch/mips/include/asm/mach-ralink/rt288x.h Normal file
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@ -0,0 +1,49 @@
/*
* 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>
*/
#ifndef _RT288X_REGS_H_
#define _RT288X_REGS_H_
#define RT2880_SYSC_BASE 0x00300000
#define SYSC_REG_CHIP_NAME0 0x00
#define SYSC_REG_CHIP_NAME1 0x04
#define SYSC_REG_CHIP_ID 0x0c
#define SYSC_REG_SYSTEM_CONFIG 0x10
#define SYSC_REG_CLKCFG 0x30
#define RT2880_CHIP_NAME0 0x38325452
#define RT2880_CHIP_NAME1 0x20203038
#define CHIP_ID_ID_MASK 0xff
#define CHIP_ID_ID_SHIFT 8
#define CHIP_ID_REV_MASK 0xff
#define SYSTEM_CONFIG_CPUCLK_SHIFT 20
#define SYSTEM_CONFIG_CPUCLK_MASK 0x3
#define SYSTEM_CONFIG_CPUCLK_250 0x0
#define SYSTEM_CONFIG_CPUCLK_266 0x1
#define SYSTEM_CONFIG_CPUCLK_280 0x2
#define SYSTEM_CONFIG_CPUCLK_300 0x3
#define RT2880_GPIO_MODE_I2C BIT(0)
#define RT2880_GPIO_MODE_UART0 BIT(1)
#define RT2880_GPIO_MODE_SPI BIT(2)
#define RT2880_GPIO_MODE_UART1 BIT(3)
#define RT2880_GPIO_MODE_JTAG BIT(4)
#define RT2880_GPIO_MODE_MDIO BIT(5)
#define RT2880_GPIO_MODE_SDRAM BIT(6)
#define RT2880_GPIO_MODE_PCI BIT(7)
#define CLKCFG_SRAM_CS_N_WDT BIT(9)
#endif

3
arch/mips/ralink/Kconfig
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@ -6,6 +6,9 @@ choice
help
Select Ralink MIPS SoC type.
config SOC_RT288X
bool "RT288x"
config SOC_RT305X
bool "RT305x"
select USB_ARCH_HAS_HCD

1
arch/mips/ralink/Makefile
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@ -8,6 +8,7 @@
obj-y := prom.o of.o reset.o clk.o irq.o
obj-$(CONFIG_SOC_RT288X) += rt288x.o
obj-$(CONFIG_SOC_RT305X) += rt305x.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o

5
arch/mips/ralink/Platform
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@ -4,6 +4,11 @@
core-$(CONFIG_RALINK) += arch/mips/ralink/
cflags-$(CONFIG_RALINK) += -I$(srctree)/arch/mips/include/asm/mach-ralink
#
# Ralink RT288x
#
load-$(CONFIG_SOC_RT288X) += 0xffffffff88000000
#
# Ralink RT305x
#

139
arch/mips/ralink/rt288x.c Normal file
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@ -0,0 +1,139 @@
/*
* 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));
}