From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 arch/mips/sgi-ip27/ip27-init.c | 147 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 arch/mips/sgi-ip27/ip27-init.c

(limited to 'arch/mips/sgi-ip27/ip27-init.c')

diff --git a/arch/mips/sgi-ip27/ip27-init.c b/arch/mips/sgi-ip27/ip27-init.c
new file mode 100644
index 000000000..a4daf8ccd
--- /dev/null
+++ b/arch/mips/sgi-ip27/ip27-init.c
@@ -0,0 +1,147 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License.  See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
+ * Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/mm.h>
+#include <linux/export.h>
+#include <linux/cpumask.h>
+#include <asm/bootinfo.h>
+#include <asm/cpu.h>
+#include <asm/io.h>
+#include <asm/sgialib.h>
+#include <asm/time.h>
+#include <asm/sn/agent.h>
+#include <asm/sn/types.h>
+#include <asm/sn/klconfig.h>
+#include <asm/sn/ioc3.h>
+#include <asm/mipsregs.h>
+#include <asm/sn/gda.h>
+#include <asm/sn/intr.h>
+#include <asm/current.h>
+#include <asm/processor.h>
+#include <asm/mmu_context.h>
+#include <asm/thread_info.h>
+#include <asm/sn/launch.h>
+#include <asm/sn/mapped_kernel.h>
+
+#include "ip27-common.h"
+
+#define CPU_NONE		(cpuid_t)-1
+
+static DECLARE_BITMAP(hub_init_mask, MAX_NUMNODES);
+nasid_t master_nasid = INVALID_NASID;
+
+struct cpuinfo_ip27 sn_cpu_info[NR_CPUS];
+EXPORT_SYMBOL_GPL(sn_cpu_info);
+
+static void per_hub_init(nasid_t nasid)
+{
+	struct hub_data *hub = hub_data(nasid);
+
+	cpumask_set_cpu(smp_processor_id(), &hub->h_cpus);
+
+	if (test_and_set_bit(nasid, hub_init_mask))
+		return;
+	/*
+	 * Set CRB timeout at 5ms, (< PI timeout of 10ms)
+	 */
+	REMOTE_HUB_S(nasid, IIO_ICTP, 0x800);
+	REMOTE_HUB_S(nasid, IIO_ICTO, 0xff);
+
+	hub_rtc_init(nasid);
+
+	if (nasid) {
+		/* copy exception handlers from first node to current node */
+		memcpy((void *)NODE_OFFSET_TO_K0(nasid, 0),
+		       (void *)CKSEG0, 0x200);
+		__flush_cache_all();
+		/* switch to node local exception handlers */
+		REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_8K);
+	}
+}
+
+void per_cpu_init(void)
+{
+	int cpu = smp_processor_id();
+	nasid_t nasid = get_nasid();
+
+	clear_c0_status(ST0_IM);
+
+	per_hub_init(nasid);
+
+	pr_info("CPU %d clock is %dMHz.\n", cpu, sn_cpu_info[cpu].p_speed);
+
+	install_ipi();
+
+	/* Install our NMI handler if symmon hasn't installed one. */
+	install_cpu_nmi_handler(cputoslice(cpu));
+
+	enable_percpu_irq(IP27_HUB_PEND0_IRQ, IRQ_TYPE_NONE);
+	enable_percpu_irq(IP27_HUB_PEND1_IRQ, IRQ_TYPE_NONE);
+}
+
+void __init plat_mem_setup(void)
+{
+	u64 p, e, n_mode;
+	nasid_t nid;
+
+	register_smp_ops(&ip27_smp_ops);
+
+	ip27_reboot_setup();
+
+	/*
+	 * hub_rtc init and cpu clock intr enabled for later calibrate_delay.
+	 */
+	nid = get_nasid();
+	printk("IP27: Running on node %d.\n", nid);
+
+	p = LOCAL_HUB_L(PI_CPU_PRESENT_A) & 1;
+	e = LOCAL_HUB_L(PI_CPU_ENABLE_A) & 1;
+	printk("Node %d has %s primary CPU%s.\n", nid,
+	       p ? "a" : "no",
+	       e ? ", CPU is running" : "");
+
+	p = LOCAL_HUB_L(PI_CPU_PRESENT_B) & 1;
+	e = LOCAL_HUB_L(PI_CPU_ENABLE_B) & 1;
+	printk("Node %d has %s secondary CPU%s.\n", nid,
+	       p ? "a" : "no",
+	       e ? ", CPU is running" : "");
+
+	/*
+	 * Try to catch kernel missconfigurations and give user an
+	 * indication what option to select.
+	 */
+	n_mode = LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_MORENODES_MASK;
+	printk("Machine is in %c mode.\n", n_mode ? 'N' : 'M');
+#ifdef CONFIG_SGI_SN_N_MODE
+	if (!n_mode)
+		panic("Kernel compiled for M mode.");
+#else
+	if (n_mode)
+		panic("Kernel compiled for N mode.");
+#endif
+
+	ioport_resource.start = 0;
+	ioport_resource.end = ~0UL;
+	set_io_port_base(IO_BASE);
+}
+
+const char *get_system_type(void)
+{
+	return "SGI Origin";
+}
+
+void __init prom_init(void)
+{
+	prom_init_cmdline(fw_arg0, (LONG *)fw_arg1);
+	prom_meminit();
+}
+
-- 
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