MIPS: ralink: adds support for RT305x SoC family

Add support code for rt3050, rt3052, rt3350, rt3352 and rt5350 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/4896/

1 files changed, 242 insertions, 0 deletions

diff --git a/arch/mips/ralink/rt305x.c b/arch/mips/ralink/rt305x.c
new file mode 100644
index 000000000000..0a4bbdcf59d9
--- /dev/null
+++ b/arch/mips/ralink/rt305x.c
@@ -0,0 +1,242 @@
+/*
+ * 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/rt305x.h>
+
+#include "common.h"
+
+enum rt305x_soc_type rt305x_soc;
+
+struct ralink_pinmux_grp mode_mux[] = {
+	{
+		.name = "i2c",
+		.mask = RT305X_GPIO_MODE_I2C,
+		.gpio_first = RT305X_GPIO_I2C_SD,
+		.gpio_last = RT305X_GPIO_I2C_SCLK,
+	}, {
+		.name = "spi",
+		.mask = RT305X_GPIO_MODE_SPI,
+		.gpio_first = RT305X_GPIO_SPI_EN,
+		.gpio_last = RT305X_GPIO_SPI_CLK,
+	}, {
+		.name = "uartlite",
+		.mask = RT305X_GPIO_MODE_UART1,
+		.gpio_first = RT305X_GPIO_UART1_TXD,
+		.gpio_last = RT305X_GPIO_UART1_RXD,
+	}, {
+		.name = "jtag",
+		.mask = RT305X_GPIO_MODE_JTAG,
+		.gpio_first = RT305X_GPIO_JTAG_TDO,
+		.gpio_last = RT305X_GPIO_JTAG_TDI,
+	}, {
+		.name = "mdio",
+		.mask = RT305X_GPIO_MODE_MDIO,
+		.gpio_first = RT305X_GPIO_MDIO_MDC,
+		.gpio_last = RT305X_GPIO_MDIO_MDIO,
+	}, {
+		.name = "sdram",
+		.mask = RT305X_GPIO_MODE_SDRAM,
+		.gpio_first = RT305X_GPIO_SDRAM_MD16,
+		.gpio_last = RT305X_GPIO_SDRAM_MD31,
+	}, {
+		.name = "rgmii",
+		.mask = RT305X_GPIO_MODE_RGMII,
+		.gpio_first = RT305X_GPIO_GE0_TXD0,
+		.gpio_last = RT305X_GPIO_GE0_RXCLK,
+	}, {0}
+};
+
+struct ralink_pinmux_grp uart_mux[] = {
+	{
+		.name = "uartf",
+		.mask = RT305X_GPIO_MODE_UARTF,
+		.gpio_first = RT305X_GPIO_7,
+		.gpio_last = RT305X_GPIO_14,
+	}, {
+		.name = "pcm uartf",
+		.mask = RT305X_GPIO_MODE_PCM_UARTF,
+		.gpio_first = RT305X_GPIO_7,
+		.gpio_last = RT305X_GPIO_14,
+	}, {
+		.name = "pcm i2s",
+		.mask = RT305X_GPIO_MODE_PCM_I2S,
+		.gpio_first = RT305X_GPIO_7,
+		.gpio_last = RT305X_GPIO_14,
+	}, {
+		.name = "i2s uartf",
+		.mask = RT305X_GPIO_MODE_I2S_UARTF,
+		.gpio_first = RT305X_GPIO_7,
+		.gpio_last = RT305X_GPIO_14,
+	}, {
+		.name = "pcm gpio",
+		.mask = RT305X_GPIO_MODE_PCM_GPIO,
+		.gpio_first = RT305X_GPIO_10,
+		.gpio_last = RT305X_GPIO_14,
+	}, {
+		.name = "gpio uartf",
+		.mask = RT305X_GPIO_MODE_GPIO_UARTF,
+		.gpio_first = RT305X_GPIO_7,
+		.gpio_last = RT305X_GPIO_14,
+	}, {
+		.name = "gpio i2s",
+		.mask = RT305X_GPIO_MODE_GPIO_I2S,
+		.gpio_first = RT305X_GPIO_7,
+		.gpio_last = RT305X_GPIO_14,
+	}, {
+		.name = "gpio",
+		.mask = RT305X_GPIO_MODE_GPIO,
+	}, {0}
+};
+
+void rt305x_wdt_reset(void)
+{
+	u32 t;
+
+	/* enable WDT reset output on pin SRAM_CS_N */
+	t = rt_sysc_r32(SYSC_REG_SYSTEM_CONFIG);
+	t |= RT305X_SYSCFG_SRAM_CS0_MODE_WDT <<
+		RT305X_SYSCFG_SRAM_CS0_MODE_SHIFT;
+	rt_sysc_w32(t, SYSC_REG_SYSTEM_CONFIG);
+}
+
+struct ralink_pinmux gpio_pinmux = {
+	.mode = mode_mux,
+	.uart = uart_mux,
+	.uart_shift = RT305X_GPIO_MODE_UART0_SHIFT,
+	.wdt_reset = rt305x_wdt_reset,
+};
+
+void __init ralink_clk_init(void)
+{
+	unsigned long cpu_rate, sys_rate, wdt_rate, uart_rate;
+	u32 t = rt_sysc_r32(SYSC_REG_SYSTEM_CONFIG);
+
+	if (soc_is_rt305x() || soc_is_rt3350()) {
+		t = (t >> RT305X_SYSCFG_CPUCLK_SHIFT) &
+		     RT305X_SYSCFG_CPUCLK_MASK;
+		switch (t) {
+		case RT305X_SYSCFG_CPUCLK_LOW:
+			cpu_rate = 320000000;
+			break;
+		case RT305X_SYSCFG_CPUCLK_HIGH:
+			cpu_rate = 384000000;
+			break;
+		}
+		sys_rate = uart_rate = wdt_rate = cpu_rate / 3;
+	} else if (soc_is_rt3352()) {
+		t = (t >> RT3352_SYSCFG0_CPUCLK_SHIFT) &
+		     RT3352_SYSCFG0_CPUCLK_MASK;
+		switch (t) {
+		case RT3352_SYSCFG0_CPUCLK_LOW:
+			cpu_rate = 384000000;
+			break;
+		case RT3352_SYSCFG0_CPUCLK_HIGH:
+			cpu_rate = 400000000;
+			break;
+		}
+		sys_rate = wdt_rate = cpu_rate / 3;
+		uart_rate = 40000000;
+	} else if (soc_is_rt5350()) {
+		t = (t >> RT5350_SYSCFG0_CPUCLK_SHIFT) &
+		     RT5350_SYSCFG0_CPUCLK_MASK;
+		switch (t) {
+		case RT5350_SYSCFG0_CPUCLK_360:
+			cpu_rate = 360000000;
+			sys_rate = cpu_rate / 3;
+			break;
+		case RT5350_SYSCFG0_CPUCLK_320:
+			cpu_rate = 320000000;
+			sys_rate = cpu_rate / 4;
+			break;
+		case RT5350_SYSCFG0_CPUCLK_300:
+			cpu_rate = 300000000;
+			sys_rate = cpu_rate / 3;
+			break;
+		default:
+			BUG();
+		}
+		uart_rate = 40000000;
+		wdt_rate = sys_rate;
+	} else {
+		BUG();
+	}
+
+	ralink_clk_add("cpu", cpu_rate);
+	ralink_clk_add("10000b00.spi", sys_rate);
+	ralink_clk_add("10000100.timer", wdt_rate);
+	ralink_clk_add("10000500.uart", uart_rate);
+	ralink_clk_add("10000c00.uartlite", uart_rate);
+}
+
+void __init ralink_of_remap(void)
+{
+	rt_sysc_membase = plat_of_remap_node("ralink,rt3050-sysc");
+	rt_memc_membase = plat_of_remap_node("ralink,rt3050-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(RT305X_SYSC_BASE);
+	unsigned char *name;
+	u32 n0;
+	u32 n1;
+	u32 id;
+
+	n0 = __raw_readl(sysc + SYSC_REG_CHIP_NAME0);
+	n1 = __raw_readl(sysc + SYSC_REG_CHIP_NAME1);
+
+	if (n0 == RT3052_CHIP_NAME0 && n1 == RT3052_CHIP_NAME1) {
+		unsigned long icache_sets;
+
+		icache_sets = (read_c0_config1() >> 22) & 7;
+		if (icache_sets == 1) {
+			rt305x_soc = RT305X_SOC_RT3050;
+			name = "RT3050";
+			soc_info->compatible = "ralink,rt3050-soc";
+		} else {
+			rt305x_soc = RT305X_SOC_RT3052;
+			name = "RT3052";
+			soc_info->compatible = "ralink,rt3052-soc";
+		}
+	} else if (n0 == RT3350_CHIP_NAME0 && n1 == RT3350_CHIP_NAME1) {
+		rt305x_soc = RT305X_SOC_RT3350;
+		name = "RT3350";
+		soc_info->compatible = "ralink,rt3350-soc";
+	} else if (n0 == RT3352_CHIP_NAME0 && n1 == RT3352_CHIP_NAME1) {
+		rt305x_soc = RT305X_SOC_RT3352;
+		name = "RT3352";
+		soc_info->compatible = "ralink,rt3352-soc";
+	} else if (n0 == RT5350_CHIP_NAME0 && n1 == RT5350_CHIP_NAME1) {
+		rt305x_soc = RT305X_SOC_RT5350;
+		name = "RT5350";
+		soc_info->compatible = "ralink,rt5350-soc";
+	} else {
+		panic("rt305x: unknown SoC, n0:%08x n1:%08x\n", n0, n1);
+	}
+
+	id = __raw_readl(sysc + SYSC_REG_CHIP_ID);
+
+	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));
+}