MIPS: ralink: adds support for RT2880 SoC family

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/

6 files changed, 198 insertions, 1 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 27a4bfa0e7c8..c1997db9c57c 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -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"
diff --git a/arch/mips/include/asm/mach-ralink/rt288x.h b/arch/mips/include/asm/mach-ralink/rt288x.h
new file mode 100644
index 000000000000..ad8b42dd2fcc
--- /dev/null
+++ b/arch/mips/include/asm/mach-ralink/rt288x.h
@@ -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
diff --git a/arch/mips/ralink/Kconfig b/arch/mips/ralink/Kconfig
index a0b0197cab0a..6723b946bc10 100644
--- a/arch/mips/ralink/Kconfig
+++ b/arch/mips/ralink/Kconfig
@@ -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
diff --git a/arch/mips/ralink/Makefile b/arch/mips/ralink/Makefile
index 939757f0e71f..6d826f21987a 100644
--- a/arch/mips/ralink/Makefile
+++ b/arch/mips/ralink/Makefile
@@ -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-$(CONFIG_EARLY_PRINTK) += early_printk.o
diff --git a/arch/mips/ralink/Platform b/arch/mips/ralink/Platform
index 6babd65765e6..3f49e519d093 100644
--- a/arch/mips/ralink/Platform
+++ b/arch/mips/ralink/Platform
@@ -5,6 +5,11 @@ core-$(CONFIG_RALINK)		+= arch/mips/ralink/
 cflags-$(CONFIG_RALINK)         += -I$(srctree)/arch/mips/include/asm/mach-ralink
 
 #
+# Ralink RT288x
+#
+load-$(CONFIG_SOC_RT288X)       += 0xffffffff88000000
+
+#
 # Ralink RT305x
 #
 load-$(CONFIG_SOC_RT305X)       += 0xffffffff80000000
diff --git a/arch/mips/ralink/rt288x.c b/arch/mips/ralink/rt288x.c
new file mode 100644
index 000000000000..1e0788e75af6
--- /dev/null
+++ b/arch/mips/ralink/rt288x.c
@@ -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));
+}