MIPS: ralink: adds support for MT7620 SoC family

Add support code for mt7620 SOC.

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

Signed-off-by: John Crispin <blogic@openwrt.org>
Acked-by: Gabor Juhos <juhosg@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/5177/

4 files changed, 223 insertions, 0 deletions

diff --git a/arch/mips/ralink/Kconfig b/arch/mips/ralink/Kconfig
index ce57d3e6763..86f6c776053 100644
--- a/arch/mips/ralink/Kconfig
+++ b/arch/mips/ralink/Kconfig
@@ -20,6 +20,9 @@ choice
 		select USB_ARCH_HAS_OHCI
 		select USB_ARCH_HAS_EHCI
 
+	config SOC_MT7620
+		bool "MT7620"
+
 endchoice
 
 choice
diff --git a/arch/mips/ralink/Makefile b/arch/mips/ralink/Makefile
index ba9669cf90a..38cf1a880aa 100644
--- a/arch/mips/ralink/Makefile
+++ b/arch/mips/ralink/Makefile
@@ -11,6 +11,7 @@ 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-$(CONFIG_SOC_RT3883) += rt3883.o
+obj-$(CONFIG_SOC_MT7620) += mt7620.o
 
 obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
 
diff --git a/arch/mips/ralink/Platform b/arch/mips/ralink/Platform
index f67c08dbb95..b2cbf16faca 100644
--- a/arch/mips/ralink/Platform
+++ b/arch/mips/ralink/Platform
@@ -18,3 +18,8 @@ load-$(CONFIG_SOC_RT305X)	+= 0xffffffff80000000
 # Ralink RT3883
 #
 load-$(CONFIG_SOC_RT3883)	+= 0xffffffff80000000
+
+#
+# Ralink MT7620
+#
+load-$(CONFIG_SOC_MT7620)	+= 0xffffffff80000000
diff --git a/arch/mips/ralink/mt7620.c b/arch/mips/ralink/mt7620.c
new file mode 100644
index 00000000000..af19ae74016
--- /dev/null
+++ b/arch/mips/ralink/mt7620.c
@@ -0,0 +1,214 @@
+/*
+ * 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/mt7620.h>
+
+#include "common.h"
+
+/* does the board have sdram or ddram */
+static int dram_type;
+
+/* the pll dividers */
+static u32 mt7620_clk_divider[] = { 2, 3, 4, 8 };
+
+static struct ralink_pinmux_grp mode_mux[] = {
+	{
+		.name = "i2c",
+		.mask = MT7620_GPIO_MODE_I2C,
+		.gpio_first = 1,
+		.gpio_last = 2,
+	}, {
+		.name = "spi",
+		.mask = MT7620_GPIO_MODE_SPI,
+		.gpio_first = 3,
+		.gpio_last = 6,
+	}, {
+		.name = "uartlite",
+		.mask = MT7620_GPIO_MODE_UART1,
+		.gpio_first = 15,
+		.gpio_last = 16,
+	}, {
+		.name = "wdt",
+		.mask = MT7620_GPIO_MODE_WDT,
+		.gpio_first = 17,
+		.gpio_last = 17,
+	}, {
+		.name = "mdio",
+		.mask = MT7620_GPIO_MODE_MDIO,
+		.gpio_first = 22,
+		.gpio_last = 23,
+	}, {
+		.name = "rgmii1",
+		.mask = MT7620_GPIO_MODE_RGMII1,
+		.gpio_first = 24,
+		.gpio_last = 35,
+	}, {
+		.name = "spi refclk",
+		.mask = MT7620_GPIO_MODE_SPI_REF_CLK,
+		.gpio_first = 37,
+		.gpio_last = 39,
+	}, {
+		.name = "jtag",
+		.mask = MT7620_GPIO_MODE_JTAG,
+		.gpio_first = 40,
+		.gpio_last = 44,
+	}, {
+		/* shared lines with jtag */
+		.name = "ephy",
+		.mask = MT7620_GPIO_MODE_EPHY,
+		.gpio_first = 40,
+		.gpio_last = 44,
+	}, {
+		.name = "nand",
+		.mask = MT7620_GPIO_MODE_JTAG,
+		.gpio_first = 45,
+		.gpio_last = 59,
+	}, {
+		.name = "rgmii2",
+		.mask = MT7620_GPIO_MODE_RGMII2,
+		.gpio_first = 60,
+		.gpio_last = 71,
+	}, {
+		.name = "wled",
+		.mask = MT7620_GPIO_MODE_WLED,
+		.gpio_first = 72,
+		.gpio_last = 72,
+	}, {0}
+};
+
+static struct ralink_pinmux_grp uart_mux[] = {
+	{
+		.name = "uartf",
+		.mask = MT7620_GPIO_MODE_UARTF,
+		.gpio_first = 7,
+		.gpio_last = 14,
+	}, {
+		.name = "pcm uartf",
+		.mask = MT7620_GPIO_MODE_PCM_UARTF,
+		.gpio_first = 7,
+		.gpio_last = 14,
+	}, {
+		.name = "pcm i2s",
+		.mask = MT7620_GPIO_MODE_PCM_I2S,
+		.gpio_first = 7,
+		.gpio_last = 14,
+	}, {
+		.name = "i2s uartf",
+		.mask = MT7620_GPIO_MODE_I2S_UARTF,
+		.gpio_first = 7,
+		.gpio_last = 14,
+	}, {
+		.name = "pcm gpio",
+		.mask = MT7620_GPIO_MODE_PCM_GPIO,
+		.gpio_first = 11,
+		.gpio_last = 14,
+	}, {
+		.name = "gpio uartf",
+		.mask = MT7620_GPIO_MODE_GPIO_UARTF,
+		.gpio_first = 7,
+		.gpio_last = 10,
+	}, {
+		.name = "gpio i2s",
+		.mask = MT7620_GPIO_MODE_GPIO_I2S,
+		.gpio_first = 7,
+		.gpio_last = 10,
+	}, {
+		.name = "gpio",
+		.mask = MT7620_GPIO_MODE_GPIO,
+	}, {0}
+};
+
+struct ralink_pinmux rt_gpio_pinmux = {
+	.mode = mode_mux,
+	.uart = uart_mux,
+	.uart_shift = MT7620_GPIO_MODE_UART0_SHIFT,
+	.uart_mask = MT7620_GPIO_MODE_UART0_MASK,
+};
+
+void __init ralink_clk_init(void)
+{
+	unsigned long cpu_rate, sys_rate;
+	u32 c0 = rt_sysc_r32(SYSC_REG_CPLL_CONFIG0);
+	u32 c1 = rt_sysc_r32(SYSC_REG_CPLL_CONFIG1);
+	u32 swconfig = (c0 >> CPLL_SW_CONFIG_SHIFT) & CPLL_SW_CONFIG_MASK;
+	u32 cpu_clk = (c1 >> CPLL_CPU_CLK_SHIFT) & CPLL_CPU_CLK_MASK;
+
+	if (cpu_clk) {
+		cpu_rate = 480000000;
+	} else if (!swconfig) {
+		cpu_rate = 600000000;
+	} else {
+		u32 m = (c0 >> CPLL_MULT_RATIO_SHIFT) & CPLL_MULT_RATIO;
+		u32 d = (c0 >> CPLL_DIV_RATIO_SHIFT) & CPLL_DIV_RATIO;
+
+		cpu_rate = ((40 * (m + 24)) / mt7620_clk_divider[d]) * 1000000;
+	}
+
+	if (dram_type == SYSCFG0_DRAM_TYPE_SDRAM)
+		sys_rate = cpu_rate / 4;
+	else
+		sys_rate = cpu_rate / 3;
+
+	ralink_clk_add("cpu", cpu_rate);
+	ralink_clk_add("10000100.timer", 40000000);
+	ralink_clk_add("10000500.uart", 40000000);
+	ralink_clk_add("10000c00.uartlite", 40000000);
+}
+
+void __init ralink_of_remap(void)
+{
+	rt_sysc_membase = plat_of_remap_node("ralink,mt7620a-sysc");
+	rt_memc_membase = plat_of_remap_node("ralink,mt7620a-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(MT7620_SYSC_BASE);
+	unsigned char *name = NULL;
+	u32 n0;
+	u32 n1;
+	u32 rev;
+	u32 cfg0;
+
+	n0 = __raw_readl(sysc + SYSC_REG_CHIP_NAME0);
+	n1 = __raw_readl(sysc + SYSC_REG_CHIP_NAME1);
+
+	if (n0 == MT7620N_CHIP_NAME0 && n1 == MT7620N_CHIP_NAME1) {
+		name = "MT7620N";
+		soc_info->compatible = "ralink,mt7620n-soc";
+	} else if (n0 == MT7620A_CHIP_NAME0 && n1 == MT7620A_CHIP_NAME1) {
+		name = "MT7620A";
+		soc_info->compatible = "ralink,mt7620a-soc";
+	} else {
+		panic("mt7620: unknown SoC, n0:%08x n1:%08x\n", n0, n1);
+	}
+
+	rev = __raw_readl(sysc + SYSC_REG_CHIP_REV);
+
+	snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN,
+		"Ralink %s ver:%u eco:%u",
+		name,
+		(rev >> CHIP_REV_VER_SHIFT) & CHIP_REV_VER_MASK,
+		(rev & CHIP_REV_ECO_MASK));
+
+	cfg0 = __raw_readl(sysc + SYSC_REG_SYSTEM_CONFIG0);
+	dram_type = (cfg0 >> SYSCFG0_DRAM_TYPE_SHIFT) & SYSCFG0_DRAM_TYPE_MASK;
+}