14 files changed, 1048 insertions, 0 deletions

diff --git a/arch/mips/loongson32/Kconfig b/arch/mips/loongson32/Kconfig
new file mode 100644
index 000000000..2ef9da001
--- /dev/null
+++ b/arch/mips/loongson32/Kconfig
@@ -0,0 +1,75 @@
+# SPDX-License-Identifier: GPL-2.0
+if MACH_LOONGSON32
+
+choice
+	prompt "Machine Type"
+
+config LOONGSON1_LS1B
+	bool "Loongson LS1B board"
+	select CEVT_R4K if !MIPS_EXTERNAL_TIMER
+	select CSRC_R4K if !MIPS_EXTERNAL_TIMER
+	select SYS_HAS_CPU_LOONGSON1B
+	select DMA_NONCOHERENT
+	select BOOT_ELF32
+	select IRQ_MIPS_CPU
+	select SYS_SUPPORTS_32BIT_KERNEL
+	select SYS_SUPPORTS_LITTLE_ENDIAN
+	select SYS_SUPPORTS_HIGHMEM
+	select SYS_HAS_EARLY_PRINTK
+	select USE_GENERIC_EARLY_PRINTK_8250
+	select COMMON_CLK
+
+config LOONGSON1_LS1C
+	bool "Loongson LS1C board"
+	select CEVT_R4K if !MIPS_EXTERNAL_TIMER
+	select CSRC_R4K if !MIPS_EXTERNAL_TIMER
+	select SYS_HAS_CPU_LOONGSON1C
+	select DMA_NONCOHERENT
+	select BOOT_ELF32
+	select IRQ_MIPS_CPU
+	select SYS_SUPPORTS_32BIT_KERNEL
+	select SYS_SUPPORTS_LITTLE_ENDIAN
+	select SYS_SUPPORTS_HIGHMEM
+	select SYS_HAS_EARLY_PRINTK
+	select USE_GENERIC_EARLY_PRINTK_8250
+	select COMMON_CLK
+endchoice
+
+menuconfig CEVT_CSRC_LS1X
+	bool "Use PWM Timer for clockevent/clocksource"
+	select MIPS_EXTERNAL_TIMER
+	depends on CPU_LOONGSON32
+	help
+	  This option changes the default clockevent/clocksource to PWM Timer,
+	  and is required by Loongson1 CPUFreq support.
+
+	  If unsure, say N.
+
+choice
+	prompt "Select clockevent/clocksource"
+	depends on CEVT_CSRC_LS1X
+	default TIMER_USE_PWM0
+
+config TIMER_USE_PWM0
+	bool "Use PWM Timer 0"
+	help
+	  Use PWM Timer 0 as the default clockevent/clocksourcer.
+
+config TIMER_USE_PWM1
+	bool "Use PWM Timer 1"
+	help
+	  Use PWM Timer 1 as the default clockevent/clocksourcer.
+
+config TIMER_USE_PWM2
+	bool "Use PWM Timer 2"
+	help
+	  Use PWM Timer 2 as the default clockevent/clocksourcer.
+
+config TIMER_USE_PWM3
+	bool "Use PWM Timer 3"
+	help
+	  Use PWM Timer 3 as the default clockevent/clocksourcer.
+
+endchoice
+
+endif # MACH_LOONGSON32
diff --git a/arch/mips/loongson32/Makefile b/arch/mips/loongson32/Makefile
new file mode 100644
index 000000000..ba10954b4
--- /dev/null
+++ b/arch/mips/loongson32/Makefile
@@ -0,0 +1,18 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Common code for all Loongson 1 based systems
+#
+
+obj-$(CONFIG_MACH_LOONGSON32) += common/
+
+#
+# Loongson LS1B board
+#
+
+obj-$(CONFIG_LOONGSON1_LS1B)  += ls1b/
+
+#
+# Loongson LS1C board
+#
+
+obj-$(CONFIG_LOONGSON1_LS1C)  += ls1c/
diff --git a/arch/mips/loongson32/Platform b/arch/mips/loongson32/Platform
new file mode 100644
index 000000000..3b9673e7a
--- /dev/null
+++ b/arch/mips/loongson32/Platform
@@ -0,0 +1,3 @@
+cflags-$(CONFIG_CPU_LOONGSON32)		+= -march=mips32r2 -Wa,--trap
+cflags-$(CONFIG_MACH_LOONGSON32)	+= -I$(srctree)/arch/mips/include/asm/mach-loongson32
+load-$(CONFIG_CPU_LOONGSON32)		+= 0xffffffff80200000
diff --git a/arch/mips/loongson32/common/Makefile b/arch/mips/loongson32/common/Makefile
new file mode 100644
index 000000000..7b49c8260
--- /dev/null
+++ b/arch/mips/loongson32/common/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for common code of loongson1 based machines.
+#
+
+obj-y	+= time.o irq.o platform.o prom.o reset.o setup.o
diff --git a/arch/mips/loongson32/common/irq.c b/arch/mips/loongson32/common/irq.c
new file mode 100644
index 000000000..9a50070f7
--- /dev/null
+++ b/arch/mips/loongson32/common/irq.c
@@ -0,0 +1,191 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com>
+ */
+
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <asm/irq_cpu.h>
+
+#include <loongson1.h>
+#include <irq.h>
+
+#define LS1X_INTC_REG(n, x) \
+		((void __iomem *)KSEG1ADDR(LS1X_INTC_BASE + (n * 0x18) + (x)))
+
+#define LS1X_INTC_INTISR(n)		LS1X_INTC_REG(n, 0x0)
+#define LS1X_INTC_INTIEN(n)		LS1X_INTC_REG(n, 0x4)
+#define LS1X_INTC_INTSET(n)		LS1X_INTC_REG(n, 0x8)
+#define LS1X_INTC_INTCLR(n)		LS1X_INTC_REG(n, 0xc)
+#define LS1X_INTC_INTPOL(n)		LS1X_INTC_REG(n, 0x10)
+#define LS1X_INTC_INTEDGE(n)		LS1X_INTC_REG(n, 0x14)
+
+static void ls1x_irq_ack(struct irq_data *d)
+{
+	unsigned int bit = (d->irq - LS1X_IRQ_BASE) & 0x1f;
+	unsigned int n = (d->irq - LS1X_IRQ_BASE) >> 5;
+
+	__raw_writel(__raw_readl(LS1X_INTC_INTCLR(n))
+			| (1 << bit), LS1X_INTC_INTCLR(n));
+}
+
+static void ls1x_irq_mask(struct irq_data *d)
+{
+	unsigned int bit = (d->irq - LS1X_IRQ_BASE) & 0x1f;
+	unsigned int n = (d->irq - LS1X_IRQ_BASE) >> 5;
+
+	__raw_writel(__raw_readl(LS1X_INTC_INTIEN(n))
+			& ~(1 << bit), LS1X_INTC_INTIEN(n));
+}
+
+static void ls1x_irq_mask_ack(struct irq_data *d)
+{
+	unsigned int bit = (d->irq - LS1X_IRQ_BASE) & 0x1f;
+	unsigned int n = (d->irq - LS1X_IRQ_BASE) >> 5;
+
+	__raw_writel(__raw_readl(LS1X_INTC_INTIEN(n))
+			& ~(1 << bit), LS1X_INTC_INTIEN(n));
+	__raw_writel(__raw_readl(LS1X_INTC_INTCLR(n))
+			| (1 << bit), LS1X_INTC_INTCLR(n));
+}
+
+static void ls1x_irq_unmask(struct irq_data *d)
+{
+	unsigned int bit = (d->irq - LS1X_IRQ_BASE) & 0x1f;
+	unsigned int n = (d->irq - LS1X_IRQ_BASE) >> 5;
+
+	__raw_writel(__raw_readl(LS1X_INTC_INTIEN(n))
+			| (1 << bit), LS1X_INTC_INTIEN(n));
+}
+
+static int ls1x_irq_settype(struct irq_data *d, unsigned int type)
+{
+	unsigned int bit = (d->irq - LS1X_IRQ_BASE) & 0x1f;
+	unsigned int n = (d->irq - LS1X_IRQ_BASE) >> 5;
+
+	switch (type) {
+	case IRQ_TYPE_LEVEL_HIGH:
+		__raw_writel(__raw_readl(LS1X_INTC_INTPOL(n))
+			| (1 << bit), LS1X_INTC_INTPOL(n));
+		__raw_writel(__raw_readl(LS1X_INTC_INTEDGE(n))
+			& ~(1 << bit), LS1X_INTC_INTEDGE(n));
+		break;
+	case IRQ_TYPE_LEVEL_LOW:
+		__raw_writel(__raw_readl(LS1X_INTC_INTPOL(n))
+			& ~(1 << bit), LS1X_INTC_INTPOL(n));
+		__raw_writel(__raw_readl(LS1X_INTC_INTEDGE(n))
+			& ~(1 << bit), LS1X_INTC_INTEDGE(n));
+		break;
+	case IRQ_TYPE_EDGE_RISING:
+		__raw_writel(__raw_readl(LS1X_INTC_INTPOL(n))
+			| (1 << bit), LS1X_INTC_INTPOL(n));
+		__raw_writel(__raw_readl(LS1X_INTC_INTEDGE(n))
+			| (1 << bit), LS1X_INTC_INTEDGE(n));
+		break;
+	case IRQ_TYPE_EDGE_FALLING:
+		__raw_writel(__raw_readl(LS1X_INTC_INTPOL(n))
+			& ~(1 << bit), LS1X_INTC_INTPOL(n));
+		__raw_writel(__raw_readl(LS1X_INTC_INTEDGE(n))
+			| (1 << bit), LS1X_INTC_INTEDGE(n));
+		break;
+	case IRQ_TYPE_EDGE_BOTH:
+		__raw_writel(__raw_readl(LS1X_INTC_INTPOL(n))
+			& ~(1 << bit), LS1X_INTC_INTPOL(n));
+		__raw_writel(__raw_readl(LS1X_INTC_INTEDGE(n))
+			| (1 << bit), LS1X_INTC_INTEDGE(n));
+		break;
+	case IRQ_TYPE_NONE:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static struct irq_chip ls1x_irq_chip = {
+	.name		= "LS1X-INTC",
+	.irq_ack	= ls1x_irq_ack,
+	.irq_mask	= ls1x_irq_mask,
+	.irq_mask_ack	= ls1x_irq_mask_ack,
+	.irq_unmask	= ls1x_irq_unmask,
+	.irq_set_type   = ls1x_irq_settype,
+};
+
+static void ls1x_irq_dispatch(int n)
+{
+	u32 int_status, irq;
+
+	/* Get pending sources, masked by current enables */
+	int_status = __raw_readl(LS1X_INTC_INTISR(n)) &
+			__raw_readl(LS1X_INTC_INTIEN(n));
+
+	if (int_status) {
+		irq = LS1X_IRQ(n, __ffs(int_status));
+		do_IRQ(irq);
+	}
+}
+
+asmlinkage void plat_irq_dispatch(void)
+{
+	unsigned int pending;
+
+	pending = read_c0_cause() & read_c0_status() & ST0_IM;
+
+	if (pending & CAUSEF_IP7)
+		do_IRQ(TIMER_IRQ);
+	else if (pending & CAUSEF_IP2)
+		ls1x_irq_dispatch(0); /* INT0 */
+	else if (pending & CAUSEF_IP3)
+		ls1x_irq_dispatch(1); /* INT1 */
+	else if (pending & CAUSEF_IP4)
+		ls1x_irq_dispatch(2); /* INT2 */
+	else if (pending & CAUSEF_IP5)
+		ls1x_irq_dispatch(3); /* INT3 */
+	else if (pending & CAUSEF_IP6)
+		ls1x_irq_dispatch(4); /* INT4 */
+	else
+		spurious_interrupt();
+
+}
+
+static void __init ls1x_irq_init(int base)
+{
+	int n;
+
+	/* Disable interrupts and clear pending,
+	 * setup all IRQs as high level triggered
+	 */
+	for (n = 0; n < INTN; n++) {
+		__raw_writel(0x0, LS1X_INTC_INTIEN(n));
+		__raw_writel(0xffffffff, LS1X_INTC_INTCLR(n));
+		__raw_writel(0xffffffff, LS1X_INTC_INTPOL(n));
+		/* set DMA0, DMA1 and DMA2 to edge trigger */
+		__raw_writel(n ? 0x0 : 0xe000, LS1X_INTC_INTEDGE(n));
+	}
+
+
+	for (n = base; n < NR_IRQS; n++) {
+		irq_set_chip_and_handler(n, &ls1x_irq_chip,
+					 handle_level_irq);
+	}
+
+	if (request_irq(INT0_IRQ, no_action, IRQF_NO_THREAD, "cascade", NULL))
+		pr_err("Failed to request irq %d (cascade)\n", INT0_IRQ);
+	if (request_irq(INT1_IRQ, no_action, IRQF_NO_THREAD, "cascade", NULL))
+		pr_err("Failed to request irq %d (cascade)\n", INT1_IRQ);
+	if (request_irq(INT2_IRQ, no_action, IRQF_NO_THREAD, "cascade", NULL))
+		pr_err("Failed to request irq %d (cascade)\n", INT2_IRQ);
+	if (request_irq(INT3_IRQ, no_action, IRQF_NO_THREAD, "cascade", NULL))
+		pr_err("Failed to request irq %d (cascade)\n", INT3_IRQ);
+#if defined(CONFIG_LOONGSON1_LS1C)
+	if (request_irq(INT4_IRQ, no_action, IRQF_NO_THREAD, "cascade", NULL))
+		pr_err("Failed to request irq %d (cascade)\n", INT4_IRQ);
+#endif
+}
+
+void __init arch_init_irq(void)
+{
+	mips_cpu_irq_init();
+	ls1x_irq_init(LS1X_IRQ_BASE);
+}
diff --git a/arch/mips/loongson32/common/platform.c b/arch/mips/loongson32/common/platform.c
new file mode 100644
index 000000000..311dc1580
--- /dev/null
+++ b/arch/mips/loongson32/common/platform.c
@@ -0,0 +1,311 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2011-2016 Zhang, Keguang <keguang.zhang@gmail.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/mtd/partitions.h>
+#include <linux/sizes.h>
+#include <linux/phy.h>
+#include <linux/serial_8250.h>
+#include <linux/stmmac.h>
+#include <linux/usb/ehci_pdriver.h>
+
+#include <platform.h>
+#include <loongson1.h>
+#include <cpufreq.h>
+#include <dma.h>
+#include <nand.h>
+
+/* 8250/16550 compatible UART */
+#define LS1X_UART(_id)						\
+	{							\
+		.mapbase	= LS1X_UART ## _id ## _BASE,	\
+		.irq		= LS1X_UART ## _id ## _IRQ,	\
+		.iotype		= UPIO_MEM,			\
+		.flags		= UPF_IOREMAP | UPF_FIXED_TYPE, \
+		.type		= PORT_16550A,			\
+	}
+
+static struct plat_serial8250_port ls1x_serial8250_pdata[] = {
+	LS1X_UART(0),
+	LS1X_UART(1),
+	LS1X_UART(2),
+	LS1X_UART(3),
+	{},
+};
+
+struct platform_device ls1x_uart_pdev = {
+	.name		= "serial8250",
+	.id		= PLAT8250_DEV_PLATFORM,
+	.dev		= {
+		.platform_data = ls1x_serial8250_pdata,
+	},
+};
+
+void __init ls1x_serial_set_uartclk(struct platform_device *pdev)
+{
+	struct clk *clk;
+	struct plat_serial8250_port *p;
+
+	clk = clk_get(&pdev->dev, pdev->name);
+	if (IS_ERR(clk)) {
+		pr_err("unable to get %s clock, err=%ld",
+		       pdev->name, PTR_ERR(clk));
+		return;
+	}
+	clk_prepare_enable(clk);
+
+	for (p = pdev->dev.platform_data; p->flags != 0; ++p)
+		p->uartclk = clk_get_rate(clk);
+}
+
+/* CPUFreq */
+static struct plat_ls1x_cpufreq ls1x_cpufreq_pdata = {
+	.clk_name	= "cpu_clk",
+	.osc_clk_name	= "osc_clk",
+	.max_freq	= 266 * 1000,
+	.min_freq	= 33 * 1000,
+};
+
+struct platform_device ls1x_cpufreq_pdev = {
+	.name		= "ls1x-cpufreq",
+	.dev		= {
+		.platform_data = &ls1x_cpufreq_pdata,
+	},
+};
+
+/* Synopsys Ethernet GMAC */
+static struct stmmac_mdio_bus_data ls1x_mdio_bus_data = {
+	.phy_mask	= 0,
+};
+
+static struct stmmac_dma_cfg ls1x_eth_dma_cfg = {
+	.pbl		= 1,
+};
+
+int ls1x_eth_mux_init(struct platform_device *pdev, void *priv)
+{
+	struct plat_stmmacenet_data *plat_dat = NULL;
+	u32 val;
+
+	val = __raw_readl(LS1X_MUX_CTRL1);
+
+#if defined(CONFIG_LOONGSON1_LS1B)
+	plat_dat = dev_get_platdata(&pdev->dev);
+	if (plat_dat->bus_id) {
+		__raw_writel(__raw_readl(LS1X_MUX_CTRL0) | GMAC1_USE_UART1 |
+			     GMAC1_USE_UART0, LS1X_MUX_CTRL0);
+		switch (plat_dat->phy_interface) {
+		case PHY_INTERFACE_MODE_RGMII:
+			val &= ~(GMAC1_USE_TXCLK | GMAC1_USE_PWM23);
+			break;
+		case PHY_INTERFACE_MODE_MII:
+			val |= (GMAC1_USE_TXCLK | GMAC1_USE_PWM23);
+			break;
+		default:
+			pr_err("unsupported mii mode %d\n",
+			       plat_dat->phy_interface);
+			return -ENOTSUPP;
+		}
+		val &= ~GMAC1_SHUT;
+	} else {
+		switch (plat_dat->phy_interface) {
+		case PHY_INTERFACE_MODE_RGMII:
+			val &= ~(GMAC0_USE_TXCLK | GMAC0_USE_PWM01);
+			break;
+		case PHY_INTERFACE_MODE_MII:
+			val |= (GMAC0_USE_TXCLK | GMAC0_USE_PWM01);
+			break;
+		default:
+			pr_err("unsupported mii mode %d\n",
+			       plat_dat->phy_interface);
+			return -ENOTSUPP;
+		}
+		val &= ~GMAC0_SHUT;
+	}
+	__raw_writel(val, LS1X_MUX_CTRL1);
+#elif defined(CONFIG_LOONGSON1_LS1C)
+	plat_dat = dev_get_platdata(&pdev->dev);
+
+	val &= ~PHY_INTF_SELI;
+	if (plat_dat->phy_interface == PHY_INTERFACE_MODE_RMII)
+		val |= 0x4 << PHY_INTF_SELI_SHIFT;
+	__raw_writel(val, LS1X_MUX_CTRL1);
+
+	val = __raw_readl(LS1X_MUX_CTRL0);
+	__raw_writel(val & (~GMAC_SHUT), LS1X_MUX_CTRL0);
+#endif
+
+	return 0;
+}
+
+static struct plat_stmmacenet_data ls1x_eth0_pdata = {
+	.bus_id			= 0,
+	.phy_addr		= -1,
+#if defined(CONFIG_LOONGSON1_LS1B)
+	.phy_interface		= PHY_INTERFACE_MODE_MII,
+#elif defined(CONFIG_LOONGSON1_LS1C)
+	.phy_interface		= PHY_INTERFACE_MODE_RMII,
+#endif
+	.mdio_bus_data		= &ls1x_mdio_bus_data,
+	.dma_cfg		= &ls1x_eth_dma_cfg,
+	.has_gmac		= 1,
+	.tx_coe			= 1,
+	.rx_queues_to_use	= 1,
+	.tx_queues_to_use	= 1,
+	.init			= ls1x_eth_mux_init,
+};
+
+static struct resource ls1x_eth0_resources[] = {
+	[0] = {
+		.start	= LS1X_GMAC0_BASE,
+		.end	= LS1X_GMAC0_BASE + SZ_64K - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.name	= "macirq",
+		.start	= LS1X_GMAC0_IRQ,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+struct platform_device ls1x_eth0_pdev = {
+	.name		= "stmmaceth",
+	.id		= 0,
+	.num_resources	= ARRAY_SIZE(ls1x_eth0_resources),
+	.resource	= ls1x_eth0_resources,
+	.dev		= {
+		.platform_data = &ls1x_eth0_pdata,
+	},
+};
+
+#ifdef CONFIG_LOONGSON1_LS1B
+static struct plat_stmmacenet_data ls1x_eth1_pdata = {
+	.bus_id			= 1,
+	.phy_addr		= -1,
+	.phy_interface		= PHY_INTERFACE_MODE_MII,
+	.mdio_bus_data		= &ls1x_mdio_bus_data,
+	.dma_cfg		= &ls1x_eth_dma_cfg,
+	.has_gmac		= 1,
+	.tx_coe			= 1,
+	.rx_queues_to_use	= 1,
+	.tx_queues_to_use	= 1,
+	.init			= ls1x_eth_mux_init,
+};
+
+static struct resource ls1x_eth1_resources[] = {
+	[0] = {
+		.start	= LS1X_GMAC1_BASE,
+		.end	= LS1X_GMAC1_BASE + SZ_64K - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.name	= "macirq",
+		.start	= LS1X_GMAC1_IRQ,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+struct platform_device ls1x_eth1_pdev = {
+	.name		= "stmmaceth",
+	.id		= 1,
+	.num_resources	= ARRAY_SIZE(ls1x_eth1_resources),
+	.resource	= ls1x_eth1_resources,
+	.dev		= {
+		.platform_data = &ls1x_eth1_pdata,
+	},
+};
+#endif	/* CONFIG_LOONGSON1_LS1B */
+
+/* GPIO */
+static struct resource ls1x_gpio0_resources[] = {
+	[0] = {
+		.start	= LS1X_GPIO0_BASE,
+		.end	= LS1X_GPIO0_BASE + SZ_4 - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+};
+
+struct platform_device ls1x_gpio0_pdev = {
+	.name		= "ls1x-gpio",
+	.id		= 0,
+	.num_resources	= ARRAY_SIZE(ls1x_gpio0_resources),
+	.resource	= ls1x_gpio0_resources,
+};
+
+static struct resource ls1x_gpio1_resources[] = {
+	[0] = {
+		.start	= LS1X_GPIO1_BASE,
+		.end	= LS1X_GPIO1_BASE + SZ_4 - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+};
+
+struct platform_device ls1x_gpio1_pdev = {
+	.name		= "ls1x-gpio",
+	.id		= 1,
+	.num_resources	= ARRAY_SIZE(ls1x_gpio1_resources),
+	.resource	= ls1x_gpio1_resources,
+};
+
+/* USB EHCI */
+static u64 ls1x_ehci_dmamask = DMA_BIT_MASK(32);
+
+static struct resource ls1x_ehci_resources[] = {
+	[0] = {
+		.start	= LS1X_EHCI_BASE,
+		.end	= LS1X_EHCI_BASE + SZ_32K - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= LS1X_EHCI_IRQ,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static struct usb_ehci_pdata ls1x_ehci_pdata = {
+};
+
+struct platform_device ls1x_ehci_pdev = {
+	.name		= "ehci-platform",
+	.id		= -1,
+	.num_resources	= ARRAY_SIZE(ls1x_ehci_resources),
+	.resource	= ls1x_ehci_resources,
+	.dev		= {
+		.dma_mask = &ls1x_ehci_dmamask,
+		.platform_data = &ls1x_ehci_pdata,
+	},
+};
+
+/* Real Time Clock */
+void __init ls1x_rtc_set_extclk(struct platform_device *pdev)
+{
+	u32 val = __raw_readl(LS1X_RTC_CTRL);
+
+	if (!(val & RTC_EXTCLK_OK))
+		__raw_writel(val | RTC_EXTCLK_EN, LS1X_RTC_CTRL);
+}
+
+struct platform_device ls1x_rtc_pdev = {
+	.name		= "ls1x-rtc",
+	.id		= -1,
+};
+
+/* Watchdog */
+static struct resource ls1x_wdt_resources[] = {
+	{
+		.start	= LS1X_WDT_BASE,
+		.end	= LS1X_WDT_BASE + SZ_16 - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+};
+
+struct platform_device ls1x_wdt_pdev = {
+	.name		= "ls1x-wdt",
+	.id		= -1,
+	.num_resources	= ARRAY_SIZE(ls1x_wdt_resources),
+	.resource	= ls1x_wdt_resources,
+};
diff --git a/arch/mips/loongson32/common/prom.c b/arch/mips/loongson32/common/prom.c
new file mode 100644
index 000000000..fc580a227
--- /dev/null
+++ b/arch/mips/loongson32/common/prom.c
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com>
+ *
+ * Modified from arch/mips/pnx833x/common/prom.c.
+ */
+
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/memblock.h>
+#include <linux/serial_reg.h>
+#include <asm/fw/fw.h>
+
+#include <loongson1.h>
+
+unsigned long memsize;
+
+void __init prom_init(void)
+{
+	void __iomem *uart_base;
+
+	fw_init_cmdline();
+
+	memsize = fw_getenvl("memsize");
+	if(!memsize)
+		memsize = DEFAULT_MEMSIZE;
+
+	if (strstr(arcs_cmdline, "console=ttyS3"))
+		uart_base = ioremap(LS1X_UART3_BASE, 0x0f);
+	else if (strstr(arcs_cmdline, "console=ttyS2"))
+		uart_base = ioremap(LS1X_UART2_BASE, 0x0f);
+	else if (strstr(arcs_cmdline, "console=ttyS1"))
+		uart_base = ioremap(LS1X_UART1_BASE, 0x0f);
+	else
+		uart_base = ioremap(LS1X_UART0_BASE, 0x0f);
+	setup_8250_early_printk_port((unsigned long)uart_base, 0, 0);
+}
+
+void __init plat_mem_setup(void)
+{
+	memblock_add(0x0, (memsize << 20));
+}
diff --git a/arch/mips/loongson32/common/reset.c b/arch/mips/loongson32/common/reset.c
new file mode 100644
index 000000000..0c7399b30
--- /dev/null
+++ b/arch/mips/loongson32/common/reset.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com>
+ */
+
+#include <linux/io.h>
+#include <linux/pm.h>
+#include <linux/sizes.h>
+#include <asm/idle.h>
+#include <asm/reboot.h>
+
+#include <loongson1.h>
+
+static void __iomem *wdt_reg_base;
+
+static void ls1x_halt(void)
+{
+	while (1) {
+		if (cpu_wait)
+			cpu_wait();
+	}
+}
+
+static void ls1x_restart(char *command)
+{
+	__raw_writel(0x1, wdt_reg_base + WDT_EN);
+	__raw_writel(0x1, wdt_reg_base + WDT_TIMER);
+	__raw_writel(0x1, wdt_reg_base + WDT_SET);
+
+	ls1x_halt();
+}
+
+static void ls1x_power_off(void)
+{
+	ls1x_halt();
+}
+
+static int __init ls1x_reboot_setup(void)
+{
+	wdt_reg_base = ioremap(LS1X_WDT_BASE, (SZ_4 + SZ_8));
+	if (!wdt_reg_base)
+		panic("Failed to remap watchdog registers");
+
+	_machine_restart = ls1x_restart;
+	_machine_halt = ls1x_halt;
+	pm_power_off = ls1x_power_off;
+
+	return 0;
+}
+
+arch_initcall(ls1x_reboot_setup);
diff --git a/arch/mips/loongson32/common/setup.c b/arch/mips/loongson32/common/setup.c
new file mode 100644
index 000000000..4733fe037
--- /dev/null
+++ b/arch/mips/loongson32/common/setup.c
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com>
+ */
+
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <asm/cpu-info.h>
+#include <asm/bootinfo.h>
+
+const char *get_system_type(void)
+{
+	unsigned int processor_id = (&current_cpu_data)->processor_id;
+
+	switch (processor_id & PRID_REV_MASK) {
+	case PRID_REV_LOONGSON1B:
+#if defined(CONFIG_LOONGSON1_LS1B)
+		return "LOONGSON LS1B";
+#elif defined(CONFIG_LOONGSON1_LS1C)
+		return "LOONGSON LS1C";
+#endif
+	default:
+		return "LOONGSON (unknown)";
+	}
+}
diff --git a/arch/mips/loongson32/common/time.c b/arch/mips/loongson32/common/time.c
new file mode 100644
index 000000000..459b15c96
--- /dev/null
+++ b/arch/mips/loongson32/common/time.c
@@ -0,0 +1,232 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2014 Zhang, Keguang <keguang.zhang@gmail.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/sizes.h>
+#include <asm/time.h>
+
+#include <loongson1.h>
+#include <platform.h>
+
+#ifdef CONFIG_CEVT_CSRC_LS1X
+
+#if defined(CONFIG_TIMER_USE_PWM1)
+#define LS1X_TIMER_BASE	LS1X_PWM1_BASE
+#define LS1X_TIMER_IRQ	LS1X_PWM1_IRQ
+
+#elif defined(CONFIG_TIMER_USE_PWM2)
+#define LS1X_TIMER_BASE	LS1X_PWM2_BASE
+#define LS1X_TIMER_IRQ	LS1X_PWM2_IRQ
+
+#elif defined(CONFIG_TIMER_USE_PWM3)
+#define LS1X_TIMER_BASE	LS1X_PWM3_BASE
+#define LS1X_TIMER_IRQ	LS1X_PWM3_IRQ
+
+#else
+#define LS1X_TIMER_BASE	LS1X_PWM0_BASE
+#define LS1X_TIMER_IRQ	LS1X_PWM0_IRQ
+#endif
+
+DEFINE_RAW_SPINLOCK(ls1x_timer_lock);
+
+static void __iomem *timer_reg_base;
+static uint32_t ls1x_jiffies_per_tick;
+
+static inline void ls1x_pwmtimer_set_period(uint32_t period)
+{
+	__raw_writel(period, timer_reg_base + PWM_HRC);
+	__raw_writel(period, timer_reg_base + PWM_LRC);
+}
+
+static inline void ls1x_pwmtimer_restart(void)
+{
+	__raw_writel(0x0, timer_reg_base + PWM_CNT);
+	__raw_writel(INT_EN | CNT_EN, timer_reg_base + PWM_CTRL);
+}
+
+void __init ls1x_pwmtimer_init(void)
+{
+	timer_reg_base = ioremap(LS1X_TIMER_BASE, SZ_16);
+	if (!timer_reg_base)
+		panic("Failed to remap timer registers");
+
+	ls1x_jiffies_per_tick = DIV_ROUND_CLOSEST(mips_hpt_frequency, HZ);
+
+	ls1x_pwmtimer_set_period(ls1x_jiffies_per_tick);
+	ls1x_pwmtimer_restart();
+}
+
+static u64 ls1x_clocksource_read(struct clocksource *cs)
+{
+	unsigned long flags;
+	int count;
+	u32 jifs;
+	static int old_count;
+	static u32 old_jifs;
+
+	raw_spin_lock_irqsave(&ls1x_timer_lock, flags);
+	/*
+	 * Although our caller may have the read side of xtime_lock,
+	 * this is now a seqlock, and we are cheating in this routine
+	 * by having side effects on state that we cannot undo if
+	 * there is a collision on the seqlock and our caller has to
+	 * retry.  (Namely, old_jifs and old_count.)  So we must treat
+	 * jiffies as volatile despite the lock.  We read jiffies
+	 * before latching the timer count to guarantee that although
+	 * the jiffies value might be older than the count (that is,
+	 * the counter may underflow between the last point where
+	 * jiffies was incremented and the point where we latch the
+	 * count), it cannot be newer.
+	 */
+	jifs = jiffies;
+	/* read the count */
+	count = __raw_readl(timer_reg_base + PWM_CNT);
+
+	/*
+	 * It's possible for count to appear to go the wrong way for this
+	 * reason:
+	 *
+	 *  The timer counter underflows, but we haven't handled the resulting
+	 *  interrupt and incremented jiffies yet.
+	 *
+	 * Previous attempts to handle these cases intelligently were buggy, so
+	 * we just do the simple thing now.
+	 */
+	if (count < old_count && jifs == old_jifs)
+		count = old_count;
+
+	old_count = count;
+	old_jifs = jifs;
+
+	raw_spin_unlock_irqrestore(&ls1x_timer_lock, flags);
+
+	return (u64) (jifs * ls1x_jiffies_per_tick) + count;
+}
+
+static struct clocksource ls1x_clocksource = {
+	.name		= "ls1x-pwmtimer",
+	.read		= ls1x_clocksource_read,
+	.mask		= CLOCKSOURCE_MASK(24),
+	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static irqreturn_t ls1x_clockevent_isr(int irq, void *devid)
+{
+	struct clock_event_device *cd = devid;
+
+	ls1x_pwmtimer_restart();
+	cd->event_handler(cd);
+
+	return IRQ_HANDLED;
+}
+
+static int ls1x_clockevent_set_state_periodic(struct clock_event_device *cd)
+{
+	raw_spin_lock(&ls1x_timer_lock);
+	ls1x_pwmtimer_set_period(ls1x_jiffies_per_tick);
+	ls1x_pwmtimer_restart();
+	__raw_writel(INT_EN | CNT_EN, timer_reg_base + PWM_CTRL);
+	raw_spin_unlock(&ls1x_timer_lock);
+
+	return 0;
+}
+
+static int ls1x_clockevent_tick_resume(struct clock_event_device *cd)
+{
+	raw_spin_lock(&ls1x_timer_lock);
+	__raw_writel(INT_EN | CNT_EN, timer_reg_base + PWM_CTRL);
+	raw_spin_unlock(&ls1x_timer_lock);
+
+	return 0;
+}
+
+static int ls1x_clockevent_set_state_shutdown(struct clock_event_device *cd)
+{
+	raw_spin_lock(&ls1x_timer_lock);
+	__raw_writel(__raw_readl(timer_reg_base + PWM_CTRL) & ~CNT_EN,
+		     timer_reg_base + PWM_CTRL);
+	raw_spin_unlock(&ls1x_timer_lock);
+
+	return 0;
+}
+
+static int ls1x_clockevent_set_next(unsigned long evt,
+				    struct clock_event_device *cd)
+{
+	raw_spin_lock(&ls1x_timer_lock);
+	ls1x_pwmtimer_set_period(evt);
+	ls1x_pwmtimer_restart();
+	raw_spin_unlock(&ls1x_timer_lock);
+
+	return 0;
+}
+
+static struct clock_event_device ls1x_clockevent = {
+	.name			= "ls1x-pwmtimer",
+	.features		= CLOCK_EVT_FEAT_PERIODIC,
+	.rating			= 300,
+	.irq			= LS1X_TIMER_IRQ,
+	.set_next_event		= ls1x_clockevent_set_next,
+	.set_state_shutdown	= ls1x_clockevent_set_state_shutdown,
+	.set_state_periodic	= ls1x_clockevent_set_state_periodic,
+	.set_state_oneshot	= ls1x_clockevent_set_state_shutdown,
+	.tick_resume		= ls1x_clockevent_tick_resume,
+};
+
+static void __init ls1x_time_init(void)
+{
+	struct clock_event_device *cd = &ls1x_clockevent;
+	int ret;
+
+	if (!mips_hpt_frequency)
+		panic("Invalid timer clock rate");
+
+	ls1x_pwmtimer_init();
+
+	clockevent_set_clock(cd, mips_hpt_frequency);
+	cd->max_delta_ns = clockevent_delta2ns(0xffffff, cd);
+	cd->max_delta_ticks = 0xffffff;
+	cd->min_delta_ns = clockevent_delta2ns(0x000300, cd);
+	cd->min_delta_ticks = 0x000300;
+	cd->cpumask = cpumask_of(smp_processor_id());
+	clockevents_register_device(cd);
+
+	ls1x_clocksource.rating = 200 + mips_hpt_frequency / 10000000;
+	ret = clocksource_register_hz(&ls1x_clocksource, mips_hpt_frequency);
+	if (ret)
+		panic(KERN_ERR "Failed to register clocksource: %d\n", ret);
+
+	if (request_irq(LS1X_TIMER_IRQ, ls1x_clockevent_isr,
+			IRQF_PERCPU | IRQF_TIMER, "ls1x-pwmtimer",
+			&ls1x_clockevent))
+		pr_err("Failed to register ls1x-pwmtimer interrupt\n");
+}
+#endif /* CONFIG_CEVT_CSRC_LS1X */
+
+void __init plat_time_init(void)
+{
+	struct clk *clk = NULL;
+
+	/* initialize LS1X clocks */
+	ls1x_clk_init();
+
+#ifdef CONFIG_CEVT_CSRC_LS1X
+	/* setup LS1X PWM timer */
+	clk = clk_get(NULL, "ls1x-pwmtimer");
+	if (IS_ERR(clk))
+		panic("unable to get timer clock, err=%ld", PTR_ERR(clk));
+
+	mips_hpt_frequency = clk_get_rate(clk);
+	ls1x_time_init();
+#else
+	/* setup mips r4k timer */
+	clk = clk_get(NULL, "cpu_clk");
+	if (IS_ERR(clk))
+		panic("unable to get cpu clock, err=%ld", PTR_ERR(clk));
+
+	mips_hpt_frequency = clk_get_rate(clk) / 2;
+#endif /* CONFIG_CEVT_CSRC_LS1X */
+}
diff --git a/arch/mips/loongson32/ls1b/Makefile b/arch/mips/loongson32/ls1b/Makefile
new file mode 100644
index 000000000..33c574dc0
--- /dev/null
+++ b/arch/mips/loongson32/ls1b/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for loongson1B based machines.
+#
+
+obj-y += board.o
diff --git a/arch/mips/loongson32/ls1b/board.c b/arch/mips/loongson32/ls1b/board.c
new file mode 100644
index 000000000..727e06718
--- /dev/null
+++ b/arch/mips/loongson32/ls1b/board.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2011-2016 Zhang, Keguang <keguang.zhang@gmail.com>
+ */
+
+#include <linux/leds.h>
+#include <linux/mtd/partitions.h>
+#include <linux/sizes.h>
+
+#include <loongson1.h>
+#include <dma.h>
+#include <nand.h>
+#include <platform.h>
+
+static const struct gpio_led ls1x_gpio_leds[] __initconst = {
+	{
+		.name			= "LED9",
+		.default_trigger	= "heartbeat",
+		.gpio			= 38,
+		.active_low		= 1,
+		.default_state		= LEDS_GPIO_DEFSTATE_OFF,
+	}, {
+		.name			= "LED6",
+		.default_trigger	= "nand-disk",
+		.gpio			= 39,
+		.active_low		= 1,
+		.default_state		= LEDS_GPIO_DEFSTATE_OFF,
+	},
+};
+
+static const struct gpio_led_platform_data ls1x_led_pdata __initconst = {
+	.num_leds	= ARRAY_SIZE(ls1x_gpio_leds),
+	.leds		= ls1x_gpio_leds,
+};
+
+static struct platform_device *ls1b_platform_devices[] __initdata = {
+	&ls1x_uart_pdev,
+	&ls1x_cpufreq_pdev,
+	&ls1x_eth0_pdev,
+	&ls1x_eth1_pdev,
+	&ls1x_ehci_pdev,
+	&ls1x_gpio0_pdev,
+	&ls1x_gpio1_pdev,
+	&ls1x_rtc_pdev,
+	&ls1x_wdt_pdev,
+};
+
+static int __init ls1b_platform_init(void)
+{
+	ls1x_serial_set_uartclk(&ls1x_uart_pdev);
+
+	gpio_led_register_device(-1, &ls1x_led_pdata);
+
+	return platform_add_devices(ls1b_platform_devices,
+				   ARRAY_SIZE(ls1b_platform_devices));
+}
+
+arch_initcall(ls1b_platform_init);
diff --git a/arch/mips/loongson32/ls1c/Makefile b/arch/mips/loongson32/ls1c/Makefile
new file mode 100644
index 000000000..1cf3aa264
--- /dev/null
+++ b/arch/mips/loongson32/ls1c/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for loongson1C based machines.
+#
+
+obj-y += board.o
diff --git a/arch/mips/loongson32/ls1c/board.c b/arch/mips/loongson32/ls1c/board.c
new file mode 100644
index 000000000..9dcfe9de5
--- /dev/null
+++ b/arch/mips/loongson32/ls1c/board.c
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2016 Yang Ling <gnaygnil@gmail.com>
+ */
+
+#include <platform.h>
+
+static struct platform_device *ls1c_platform_devices[] __initdata = {
+	&ls1x_uart_pdev,
+	&ls1x_eth0_pdev,
+	&ls1x_rtc_pdev,
+	&ls1x_wdt_pdev,
+};
+
+static int __init ls1c_platform_init(void)
+{
+	ls1x_serial_set_uartclk(&ls1x_uart_pdev);
+
+	return platform_add_devices(ls1c_platform_devices,
+				   ARRAY_SIZE(ls1c_platform_devices));
+}
+
+arch_initcall(ls1c_platform_init);