1 files changed, 220 insertions, 0 deletions
diff --git a/arch/mips/generic/board-sead3.c b/arch/mips/generic/board-sead3.c
new file mode 100644
index 000000000..748ef4228
--- /dev/null
+++ b/arch/mips/generic/board-sead3.c
@@ -0,0 +1,220 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2016 Imagination Technologies
+ * Author: Paul Burton <paul.burton@mips.com>
+ */
+
+#define pr_fmt(fmt) "sead3: " fmt
+
+#include <linux/errno.h>
+#include <linux/libfdt.h>
+#include <linux/printk.h>
+#include <linux/sizes.h>
+
+#include <asm/fw/fw.h>
+#include <asm/io.h>
+#include <asm/machine.h>
+#include <asm/yamon-dt.h>
+
+#define SEAD_CONFIG			CKSEG1ADDR(0x1b100110)
+#define SEAD_CONFIG_GIC_PRESENT		BIT(1)
+
+#define MIPS_REVISION			CKSEG1ADDR(0x1fc00010)
+#define MIPS_REVISION_MACHINE		(0xf << 4)
+#define MIPS_REVISION_MACHINE_SEAD3	(0x4 << 4)
+
+/*
+ * Maximum 384MB RAM at physical address 0, preceding any I/O.
+ */
+static struct yamon_mem_region mem_regions[] __initdata = {
+	/* start	size */
+	{ 0,		SZ_256M + SZ_128M },
+	{}
+};
+
+static __init bool sead3_detect(void)
+{
+	uint32_t rev;
+
+	rev = __raw_readl((void *)MIPS_REVISION);
+	return (rev & MIPS_REVISION_MACHINE) == MIPS_REVISION_MACHINE_SEAD3;
+}
+
+static __init int append_memory(void *fdt)
+{
+	return yamon_dt_append_memory(fdt, mem_regions);
+}
+
+static __init int remove_gic(void *fdt)
+{
+	const unsigned int cpu_ehci_int = 2;
+	const unsigned int cpu_uart_int = 4;
+	const unsigned int cpu_eth_int = 6;
+	int gic_off, cpu_off, uart_off, eth_off, ehci_off, err;
+	uint32_t cfg, cpu_phandle;
+
+	/* leave the GIC node intact if a GIC is present */
+	cfg = __raw_readl((uint32_t *)SEAD_CONFIG);
+	if (cfg & SEAD_CONFIG_GIC_PRESENT)
+		return 0;
+
+	gic_off = fdt_node_offset_by_compatible(fdt, -1, "mti,gic");
+	if (gic_off < 0) {
+		pr_err("unable to find DT GIC node: %d\n", gic_off);
+		return gic_off;
+	}
+
+	err = fdt_nop_node(fdt, gic_off);
+	if (err) {
+		pr_err("unable to nop GIC node\n");
+		return err;
+	}
+
+	cpu_off = fdt_node_offset_by_compatible(fdt, -1,
+			"mti,cpu-interrupt-controller");
+	if (cpu_off < 0) {
+		pr_err("unable to find CPU intc node: %d\n", cpu_off);
+		return cpu_off;
+	}
+
+	cpu_phandle = fdt_get_phandle(fdt, cpu_off);
+	if (!cpu_phandle) {
+		pr_err("unable to get CPU intc phandle\n");
+		return -EINVAL;
+	}
+
+	uart_off = fdt_node_offset_by_compatible(fdt, -1, "ns16550a");
+	while (uart_off >= 0) {
+		err = fdt_setprop_u32(fdt, uart_off, "interrupt-parent",
+				      cpu_phandle);
+		if (err) {
+			pr_warn("unable to set UART interrupt-parent: %d\n",
+				err);
+			return err;
+		}
+
+		err = fdt_setprop_u32(fdt, uart_off, "interrupts",
+				      cpu_uart_int);
+		if (err) {
+			pr_err("unable to set UART interrupts property: %d\n",
+			       err);
+			return err;
+		}
+
+		uart_off = fdt_node_offset_by_compatible(fdt, uart_off,
+							 "ns16550a");
+	}
+	if (uart_off != -FDT_ERR_NOTFOUND) {
+		pr_err("error searching for UART DT node: %d\n", uart_off);
+		return uart_off;
+	}
+
+	eth_off = fdt_node_offset_by_compatible(fdt, -1, "smsc,lan9115");
+	if (eth_off < 0) {
+		pr_err("unable to find ethernet DT node: %d\n", eth_off);
+		return eth_off;
+	}
+
+	err = fdt_setprop_u32(fdt, eth_off, "interrupt-parent", cpu_phandle);
+	if (err) {
+		pr_err("unable to set ethernet interrupt-parent: %d\n", err);
+		return err;
+	}
+
+	err = fdt_setprop_u32(fdt, eth_off, "interrupts", cpu_eth_int);
+	if (err) {
+		pr_err("unable to set ethernet interrupts property: %d\n", err);
+		return err;
+	}
+
+	ehci_off = fdt_node_offset_by_compatible(fdt, -1, "generic-ehci");
+	if (ehci_off < 0) {
+		pr_err("unable to find EHCI DT node: %d\n", ehci_off);
+		return ehci_off;
+	}
+
+	err = fdt_setprop_u32(fdt, ehci_off, "interrupt-parent", cpu_phandle);
+	if (err) {
+		pr_err("unable to set EHCI interrupt-parent: %d\n", err);
+		return err;
+	}
+
+	err = fdt_setprop_u32(fdt, ehci_off, "interrupts", cpu_ehci_int);
+	if (err) {
+		pr_err("unable to set EHCI interrupts property: %d\n", err);
+		return err;
+	}
+
+	return 0;
+}
+
+static const struct mips_fdt_fixup sead3_fdt_fixups[] __initconst = {
+	{ yamon_dt_append_cmdline, "append command line" },
+	{ append_memory, "append memory" },
+	{ remove_gic, "remove GIC when not present" },
+	{ yamon_dt_serial_config, "append serial configuration" },
+	{ },
+};
+
+static __init const void *sead3_fixup_fdt(const void *fdt,
+					  const void *match_data)
+{
+	static unsigned char fdt_buf[16 << 10] __initdata;
+	int err;
+
+	if (fdt_check_header(fdt))
+		panic("Corrupt DT");
+
+	/* if this isn't SEAD3, something went wrong */
+	BUG_ON(fdt_node_check_compatible(fdt, 0, "mti,sead-3"));
+
+	fw_init_cmdline();
+
+	err = apply_mips_fdt_fixups(fdt_buf, sizeof(fdt_buf),
+				    fdt, sead3_fdt_fixups);
+	if (err)
+		panic("Unable to fixup FDT: %d", err);
+
+	return fdt_buf;
+}
+
+static __init unsigned int sead3_measure_hpt_freq(void)
+{
+	void __iomem *status_reg = (void __iomem *)0xbf000410;
+	unsigned int freq, orig, tick = 0;
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	orig = readl(status_reg) & 0x2;		      /* get original sample */
+	/* wait for transition */
+	while ((readl(status_reg) & 0x2) == orig)
+		;
+	orig = orig ^ 0x2;			      /* flip the bit */
+
+	write_c0_count(0);
+
+	/* wait 1 second (the sampling clock transitions every 10ms) */
+	while (tick < 100) {
+		/* wait for transition */
+		while ((readl(status_reg) & 0x2) == orig)
+			;
+		orig = orig ^ 0x2;			      /* flip the bit */
+		tick++;
+	}
+
+	freq = read_c0_count();
+
+	local_irq_restore(flags);
+
+	return freq;
+}
+
+extern char __dtb_sead3_begin[];
+
+MIPS_MACHINE(sead3) = {
+	.fdt = __dtb_sead3_begin,
+	.detect = sead3_detect,
+	.fixup_fdt = sead3_fixup_fdt,
+	.measure_hpt_freq = sead3_measure_hpt_freq,
+};