MIPS: xilfpga: Add mipsfpga platform code

The xilfpga platform will be DT only.

Add required platform code.
DT files have already been added separately.

Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Cc: robh+dt@kernel.org
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: devicetree@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11364/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

6 files changed, 142 insertions, 0 deletions

diff --git a/arch/mips/xilfpga/Kconfig b/arch/mips/xilfpga/Kconfig
new file mode 100644
index 0000000..42a030a
--- /dev/null
+++ b/arch/mips/xilfpga/Kconfig
@@ -0,0 +1,9 @@
+choice
+	prompt "Machine type"
+	depends on MACH_XILFPGA
+	default XILFPGA_NEXYS4DDR
+
+config XILFPGA_NEXYS4DDR
+	bool "Nexys4DDR by Digilent"
+
+endchoice
diff --git a/arch/mips/xilfpga/Makefile b/arch/mips/xilfpga/Makefile
new file mode 100644
index 0000000..a4deec6
--- /dev/null
+++ b/arch/mips/xilfpga/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the Xilfpga
+#
+
+obj-y +=	init.o
+obj-y +=	intc.o
+obj-y +=	time.o
diff --git a/arch/mips/xilfpga/Platform b/arch/mips/xilfpga/Platform
new file mode 100644
index 0000000..ed375af
--- /dev/null
+++ b/arch/mips/xilfpga/Platform
@@ -0,0 +1,3 @@
+platform-$(CONFIG_MACH_XILFPGA) += xilfpga/
+cflags-$(CONFIG_MACH_XILFPGA) += -I$(srctree)/arch/mips/include/asm/mach-xilfpga
+load-$(CONFIG_MACH_XILFPGA) += 0xffffffff80100000
diff --git a/arch/mips/xilfpga/init.c b/arch/mips/xilfpga/init.c
new file mode 100644
index 0000000..ce2aee2
--- /dev/null
+++ b/arch/mips/xilfpga/init.c
@@ -0,0 +1,57 @@
+/*
+ * Xilfpga platform setup
+ *
+ * Copyright (C) 2015 Imagination Technologies
+ * Author: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/of_fdt.h>
+#include <linux/of_platform.h>
+
+#include <asm/prom.h>
+
+#define XILFPGA_UART_BASE	0xb0401000
+
+const char *get_system_type(void)
+{
+	return "MIPSfpga";
+}
+
+void __init plat_mem_setup(void)
+{
+	__dt_setup_arch(__dtb_start);
+	strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE);
+}
+
+void __init prom_init(void)
+{
+	setup_8250_early_printk_port(XILFPGA_UART_BASE, 2, 50000);
+}
+
+void __init prom_free_prom_memory(void)
+{
+}
+
+void __init device_tree_init(void)
+{
+	if (!initial_boot_params)
+		return;
+
+	unflatten_and_copy_device_tree();
+}
+
+static int __init plat_of_setup(void)
+{
+	if (!of_have_populated_dt())
+		panic("Device tree not present");
+
+	if (of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL))
+		panic("Failed to populate DT");
+
+	return 0;
+}
+arch_initcall(plat_of_setup);
diff --git a/arch/mips/xilfpga/intc.c b/arch/mips/xilfpga/intc.c
new file mode 100644
index 0000000..c4d1a71
--- /dev/null
+++ b/arch/mips/xilfpga/intc.c
@@ -0,0 +1,25 @@
+/*
+ * Xilfpga interrupt controller setup
+ *
+ * Copyright (C) 2015 Imagination Technologies
+ * Author: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/of.h>
+#include <linux/of_irq.h>
+
+#include <asm/irq_cpu.h>
+
+static struct of_device_id of_irq_ids[] __initdata = {
+	{ .compatible = "mti,cpu-interrupt-controller", .data = mips_cpu_irq_of_init },
+	{},
+};
+
+void __init arch_init_irq(void)
+{
+	of_irq_init(of_irq_ids);
+}
diff --git a/arch/mips/xilfpga/time.c b/arch/mips/xilfpga/time.c
new file mode 100644
index 0000000..a1c0fc8
--- /dev/null
+++ b/arch/mips/xilfpga/time.c
@@ -0,0 +1,41 @@
+/*
+ * Xilfpga clocksource/timer setup
+ *
+ * Copyright (C) 2015 Imagination Technologies
+ * Author: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/clocksource.h>
+#include <linux/of.h>
+
+#include <asm/time.h>
+
+void __init plat_time_init(void)
+{
+	struct device_node *np;
+	struct clk *clk;
+
+	of_clk_init(NULL);
+	clocksource_of_init();
+
+	np = of_get_cpu_node(0, NULL);
+	if (!np) {
+		pr_err("Failed to get CPU node\n");
+		return;
+	}
+
+	clk = of_clk_get(np, 0);
+	if (IS_ERR(clk)) {
+		pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
+		return;
+	}
+
+	mips_hpt_frequency = clk_get_rate(clk) / 2;
+	clk_put(clk);
+}