Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

5 files changed, 744 insertions, 0 deletions

diff --git a/arch/mips/sibyte/sb1250/Makefile b/arch/mips/sibyte/sb1250/Makefile
new file mode 100644
index 000000000..cf1327d3f
--- /dev/null
+++ b/arch/mips/sibyte/sb1250/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-y := setup.o irq.o time.o
+
+obj-$(CONFIG_SMP)			+= smp.o
diff --git a/arch/mips/sibyte/sb1250/irq.c b/arch/mips/sibyte/sb1250/irq.c
new file mode 100644
index 000000000..86f49c48f
--- /dev/null
+++ b/arch/mips/sibyte/sb1250/irq.c
@@ -0,0 +1,324 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/smp.h>
+#include <linux/mm.h>
+#include <linux/kernel_stat.h>
+
+#include <asm/errno.h>
+#include <asm/signal.h>
+#include <asm/time.h>
+#include <asm/io.h>
+
+#include <asm/sibyte/sb1250_regs.h>
+#include <asm/sibyte/sb1250_int.h>
+#include <asm/sibyte/sb1250_uart.h>
+#include <asm/sibyte/sb1250_scd.h>
+#include <asm/sibyte/sb1250.h>
+
+/*
+ * These are the routines that handle all the low level interrupt stuff.
+ * Actions handled here are: initialization of the interrupt map, requesting of
+ * interrupt lines by handlers, dispatching if interrupts to handlers, probing
+ * for interrupt lines
+ */
+
+#ifdef CONFIG_SIBYTE_HAS_LDT
+extern unsigned long ldt_eoi_space;
+#endif
+
+/* Store the CPU id (not the logical number) */
+int sb1250_irq_owner[SB1250_NR_IRQS];
+
+static DEFINE_RAW_SPINLOCK(sb1250_imr_lock);
+
+void sb1250_mask_irq(int cpu, int irq)
+{
+	unsigned long flags;
+	u64 cur_ints;
+
+	raw_spin_lock_irqsave(&sb1250_imr_lock, flags);
+	cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) +
+					R_IMR_INTERRUPT_MASK));
+	cur_ints |= (((u64) 1) << irq);
+	____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) +
+					R_IMR_INTERRUPT_MASK));
+	raw_spin_unlock_irqrestore(&sb1250_imr_lock, flags);
+}
+
+void sb1250_unmask_irq(int cpu, int irq)
+{
+	unsigned long flags;
+	u64 cur_ints;
+
+	raw_spin_lock_irqsave(&sb1250_imr_lock, flags);
+	cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) +
+					R_IMR_INTERRUPT_MASK));
+	cur_ints &= ~(((u64) 1) << irq);
+	____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) +
+					R_IMR_INTERRUPT_MASK));
+	raw_spin_unlock_irqrestore(&sb1250_imr_lock, flags);
+}
+
+#ifdef CONFIG_SMP
+static int sb1250_set_affinity(struct irq_data *d, const struct cpumask *mask,
+			       bool force)
+{
+	int i = 0, old_cpu, cpu, int_on;
+	unsigned int irq = d->irq;
+	u64 cur_ints;
+	unsigned long flags;
+
+	i = cpumask_first_and(mask, cpu_online_mask);
+
+	/* Convert logical CPU to physical CPU */
+	cpu = cpu_logical_map(i);
+
+	/* Protect against other affinity changers and IMR manipulation */
+	raw_spin_lock_irqsave(&sb1250_imr_lock, flags);
+
+	/* Swizzle each CPU's IMR (but leave the IP selection alone) */
+	old_cpu = sb1250_irq_owner[irq];
+	cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(old_cpu) +
+					R_IMR_INTERRUPT_MASK));
+	int_on = !(cur_ints & (((u64) 1) << irq));
+	if (int_on) {
+		/* If it was on, mask it */
+		cur_ints |= (((u64) 1) << irq);
+		____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(old_cpu) +
+					R_IMR_INTERRUPT_MASK));
+	}
+	sb1250_irq_owner[irq] = cpu;
+	if (int_on) {
+		/* unmask for the new CPU */
+		cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) +
+					R_IMR_INTERRUPT_MASK));
+		cur_ints &= ~(((u64) 1) << irq);
+		____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) +
+					R_IMR_INTERRUPT_MASK));
+	}
+	raw_spin_unlock_irqrestore(&sb1250_imr_lock, flags);
+
+	return 0;
+}
+#endif
+
+static void disable_sb1250_irq(struct irq_data *d)
+{
+	unsigned int irq = d->irq;
+
+	sb1250_mask_irq(sb1250_irq_owner[irq], irq);
+}
+
+static void enable_sb1250_irq(struct irq_data *d)
+{
+	unsigned int irq = d->irq;
+
+	sb1250_unmask_irq(sb1250_irq_owner[irq], irq);
+}
+
+
+static void ack_sb1250_irq(struct irq_data *d)
+{
+	unsigned int irq = d->irq;
+#ifdef CONFIG_SIBYTE_HAS_LDT
+	u64 pending;
+
+	/*
+	 * If the interrupt was an HT interrupt, now is the time to
+	 * clear it.  NOTE: we assume the HT bridge was set up to
+	 * deliver the interrupts to all CPUs (which makes affinity
+	 * changing easier for us)
+	 */
+	pending = __raw_readq(IOADDR(A_IMR_REGISTER(sb1250_irq_owner[irq],
+						    R_IMR_LDT_INTERRUPT)));
+	pending &= ((u64)1 << (irq));
+	if (pending) {
+		int i;
+		for (i=0; i<NR_CPUS; i++) {
+			int cpu;
+#ifdef CONFIG_SMP
+			cpu = cpu_logical_map(i);
+#else
+			cpu = i;
+#endif
+			/*
+			 * Clear for all CPUs so an affinity switch
+			 * doesn't find an old status
+			 */
+			__raw_writeq(pending,
+				     IOADDR(A_IMR_REGISTER(cpu,
+						R_IMR_LDT_INTERRUPT_CLR)));
+		}
+
+		/*
+		 * Generate EOI.  For Pass 1 parts, EOI is a nop.  For
+		 * Pass 2, the LDT world may be edge-triggered, but
+		 * this EOI shouldn't hurt.  If they are
+		 * level-sensitive, the EOI is required.
+		 */
+		*(uint32_t *)(ldt_eoi_space+(irq<<16)+(7<<2)) = 0;
+	}
+#endif
+	sb1250_mask_irq(sb1250_irq_owner[irq], irq);
+}
+
+static struct irq_chip sb1250_irq_type = {
+	.name = "SB1250-IMR",
+	.irq_mask_ack = ack_sb1250_irq,
+	.irq_unmask = enable_sb1250_irq,
+	.irq_mask = disable_sb1250_irq,
+#ifdef CONFIG_SMP
+	.irq_set_affinity = sb1250_set_affinity
+#endif
+};
+
+void __init init_sb1250_irqs(void)
+{
+	int i;
+
+	for (i = 0; i < SB1250_NR_IRQS; i++) {
+		irq_set_chip_and_handler(i, &sb1250_irq_type,
+					 handle_level_irq);
+		sb1250_irq_owner[i] = 0;
+	}
+}
+
+
+/*
+ *  arch_init_irq is called early in the boot sequence from init/main.c via
+ *  init_IRQ.  It is responsible for setting up the interrupt mapper and
+ *  installing the handler that will be responsible for dispatching interrupts
+ *  to the "right" place.
+ */
+/*
+ * For now, map all interrupts to IP[2].  We could save
+ * some cycles by parceling out system interrupts to different
+ * IP lines, but keep it simple for bringup.  We'll also direct
+ * all interrupts to a single CPU; we should probably route
+ * PCI and LDT to one cpu and everything else to the other
+ * to balance the load a bit.
+ *
+ * On the second cpu, everything is set to IP5, which is
+ * ignored, EXCEPT the mailbox interrupt.  That one is
+ * set to IP[2] so it is handled.  This is needed so we
+ * can do cross-cpu function calls, as required by SMP
+ */
+
+#define IMR_IP2_VAL	K_INT_MAP_I0
+#define IMR_IP3_VAL	K_INT_MAP_I1
+#define IMR_IP4_VAL	K_INT_MAP_I2
+#define IMR_IP5_VAL	K_INT_MAP_I3
+#define IMR_IP6_VAL	K_INT_MAP_I4
+
+void __init arch_init_irq(void)
+{
+
+	unsigned int i;
+	u64 tmp;
+	unsigned int imask = STATUSF_IP4 | STATUSF_IP3 | STATUSF_IP2 |
+		STATUSF_IP1 | STATUSF_IP0;
+
+	/* Default everything to IP2 */
+	for (i = 0; i < SB1250_NR_IRQS; i++) {	/* was I0 */
+		__raw_writeq(IMR_IP2_VAL,
+			     IOADDR(A_IMR_REGISTER(0,
+						   R_IMR_INTERRUPT_MAP_BASE) +
+				    (i << 3)));
+		__raw_writeq(IMR_IP2_VAL,
+			     IOADDR(A_IMR_REGISTER(1,
+						   R_IMR_INTERRUPT_MAP_BASE) +
+				    (i << 3)));
+	}
+
+	init_sb1250_irqs();
+
+	/*
+	 * Map the high 16 bits of the mailbox registers to IP[3], for
+	 * inter-cpu messages
+	 */
+	/* Was I1 */
+	__raw_writeq(IMR_IP3_VAL,
+		     IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MAP_BASE) +
+			    (K_INT_MBOX_0 << 3)));
+	__raw_writeq(IMR_IP3_VAL,
+		     IOADDR(A_IMR_REGISTER(1, R_IMR_INTERRUPT_MAP_BASE) +
+			    (K_INT_MBOX_0 << 3)));
+
+	/* Clear the mailboxes.	 The firmware may leave them dirty */
+	__raw_writeq(0xffffffffffffffffULL,
+		     IOADDR(A_IMR_REGISTER(0, R_IMR_MAILBOX_CLR_CPU)));
+	__raw_writeq(0xffffffffffffffffULL,
+		     IOADDR(A_IMR_REGISTER(1, R_IMR_MAILBOX_CLR_CPU)));
+
+	/* Mask everything except the mailbox registers for both cpus */
+	tmp = ~((u64) 0) ^ (((u64) 1) << K_INT_MBOX_0);
+	__raw_writeq(tmp, IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MASK)));
+	__raw_writeq(tmp, IOADDR(A_IMR_REGISTER(1, R_IMR_INTERRUPT_MASK)));
+
+	/*
+	 * Note that the timer interrupts are also mapped, but this is
+	 * done in sb1250_time_init().	Also, the profiling driver
+	 * does its own management of IP7.
+	 */
+
+	/* Enable necessary IPs, disable the rest */
+	change_c0_status(ST0_IM, imask);
+}
+
+extern void sb1250_mailbox_interrupt(void);
+
+static inline void dispatch_ip2(void)
+{
+	unsigned int cpu = smp_processor_id();
+	unsigned long long mask;
+
+	/*
+	 * Default...we've hit an IP[2] interrupt, which means we've got to
+	 * check the 1250 interrupt registers to figure out what to do.	 Need
+	 * to detect which CPU we're on, now that smp_affinity is supported.
+	 */
+	mask = __raw_readq(IOADDR(A_IMR_REGISTER(cpu,
+				  R_IMR_INTERRUPT_STATUS_BASE)));
+	if (mask)
+		do_IRQ(fls64(mask) - 1);
+}
+
+asmlinkage void plat_irq_dispatch(void)
+{
+	unsigned int cpu = smp_processor_id();
+	unsigned int pending;
+
+	/*
+	 * What a pain. We have to be really careful saving the upper 32 bits
+	 * of any * register across function calls if we don't want them
+	 * trashed--since were running in -o32, the calling routing never saves
+	 * the full 64 bits of a register across a function call.  Being the
+	 * interrupt handler, we're guaranteed that interrupts are disabled
+	 * during this code so we don't have to worry about random interrupts
+	 * blasting the high 32 bits.
+	 */
+
+	pending = read_c0_cause() & read_c0_status() & ST0_IM;
+
+	if (pending & CAUSEF_IP7) /* CPU performance counter interrupt */
+		do_IRQ(MIPS_CPU_IRQ_BASE + 7);
+	else if (pending & CAUSEF_IP4)
+		do_IRQ(K_INT_TIMER_0 + cpu);	/* sb1250_timer_interrupt() */
+
+#ifdef CONFIG_SMP
+	else if (pending & CAUSEF_IP3)
+		sb1250_mailbox_interrupt();
+#endif
+
+	else if (pending & CAUSEF_IP2)
+		dispatch_ip2();
+	else
+		spurious_interrupt();
+}
diff --git a/arch/mips/sibyte/sb1250/setup.c b/arch/mips/sibyte/sb1250/setup.c
new file mode 100644
index 000000000..644b19038
--- /dev/null
+++ b/arch/mips/sibyte/sb1250/setup.c
@@ -0,0 +1,234 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
+ */
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/reboot.h>
+#include <linux/string.h>
+
+#include <asm/bootinfo.h>
+#include <asm/cpu.h>
+#include <asm/mipsregs.h>
+#include <asm/io.h>
+#include <asm/sibyte/sb1250.h>
+#include <asm/sibyte/sb1250_regs.h>
+#include <asm/sibyte/sb1250_scd.h>
+
+unsigned int sb1_pass;
+unsigned int soc_pass;
+unsigned int soc_type;
+EXPORT_SYMBOL(soc_type);
+unsigned int periph_rev;
+EXPORT_SYMBOL_GPL(periph_rev);
+unsigned int zbbus_mhz;
+EXPORT_SYMBOL(zbbus_mhz);
+
+static char *soc_str;
+static char *pass_str;
+static unsigned int war_pass;	/* XXXKW don't overload PASS defines? */
+
+static int __init setup_bcm1250(void)
+{
+	int ret = 0;
+
+	switch (soc_pass) {
+	case K_SYS_REVISION_BCM1250_PASS1:
+		periph_rev = 1;
+		pass_str = "Pass 1";
+		break;
+	case K_SYS_REVISION_BCM1250_A10:
+		periph_rev = 2;
+		pass_str = "A8/A10";
+		/* XXXKW different war_pass? */
+		war_pass = K_SYS_REVISION_BCM1250_PASS2;
+		break;
+	case K_SYS_REVISION_BCM1250_PASS2_2:
+		periph_rev = 2;
+		pass_str = "B1";
+		break;
+	case K_SYS_REVISION_BCM1250_B2:
+		periph_rev = 2;
+		pass_str = "B2";
+		war_pass = K_SYS_REVISION_BCM1250_PASS2_2;
+		break;
+	case K_SYS_REVISION_BCM1250_PASS3:
+		periph_rev = 3;
+		pass_str = "C0";
+		break;
+	case K_SYS_REVISION_BCM1250_C1:
+		periph_rev = 3;
+		pass_str = "C1";
+		break;
+	default:
+		if (soc_pass < K_SYS_REVISION_BCM1250_PASS2_2) {
+			periph_rev = 2;
+			pass_str = "A0-A6";
+			war_pass = K_SYS_REVISION_BCM1250_PASS2;
+		} else {
+			printk("Unknown BCM1250 rev %x\n", soc_pass);
+			ret = 1;
+		}
+		break;
+	}
+
+	return ret;
+}
+
+int sb1250_m3_workaround_needed(void)
+{
+	switch (soc_type) {
+	case K_SYS_SOC_TYPE_BCM1250:
+	case K_SYS_SOC_TYPE_BCM1250_ALT:
+	case K_SYS_SOC_TYPE_BCM1250_ALT2:
+	case K_SYS_SOC_TYPE_BCM1125:
+	case K_SYS_SOC_TYPE_BCM1125H:
+		return soc_pass < K_SYS_REVISION_BCM1250_C0;
+
+	default:
+		return 0;
+	}
+}
+
+static int __init setup_bcm112x(void)
+{
+	int ret = 0;
+
+	switch (soc_pass) {
+	case 0:
+		/* Early build didn't have revid set */
+		periph_rev = 3;
+		pass_str = "A1";
+		war_pass = K_SYS_REVISION_BCM112x_A1;
+		break;
+	case K_SYS_REVISION_BCM112x_A1:
+		periph_rev = 3;
+		pass_str = "A1";
+		break;
+	case K_SYS_REVISION_BCM112x_A2:
+		periph_rev = 3;
+		pass_str = "A2";
+		break;
+	case K_SYS_REVISION_BCM112x_A3:
+		periph_rev = 3;
+		pass_str = "A3";
+		break;
+	case K_SYS_REVISION_BCM112x_A4:
+		periph_rev = 3;
+		pass_str = "A4";
+		break;
+	case K_SYS_REVISION_BCM112x_B0:
+		periph_rev = 3;
+		pass_str = "B0";
+		break;
+	default:
+		printk("Unknown %s rev %x\n", soc_str, soc_pass);
+		ret = 1;
+	}
+
+	return ret;
+}
+
+/* Setup code likely to be common to all SiByte platforms */
+
+static int __init sys_rev_decode(void)
+{
+	int ret = 0;
+
+	war_pass = soc_pass;
+	switch (soc_type) {
+	case K_SYS_SOC_TYPE_BCM1250:
+	case K_SYS_SOC_TYPE_BCM1250_ALT:
+	case K_SYS_SOC_TYPE_BCM1250_ALT2:
+		soc_str = "BCM1250";
+		ret = setup_bcm1250();
+		break;
+	case K_SYS_SOC_TYPE_BCM1120:
+		soc_str = "BCM1120";
+		ret = setup_bcm112x();
+		break;
+	case K_SYS_SOC_TYPE_BCM1125:
+		soc_str = "BCM1125";
+		ret = setup_bcm112x();
+		break;
+	case K_SYS_SOC_TYPE_BCM1125H:
+		soc_str = "BCM1125H";
+		ret = setup_bcm112x();
+		break;
+	default:
+		printk("Unknown SOC type %x\n", soc_type);
+		ret = 1;
+		break;
+	}
+
+	return ret;
+}
+
+void __init sb1250_setup(void)
+{
+	uint64_t sys_rev;
+	int plldiv;
+	int bad_config = 0;
+
+	sb1_pass = read_c0_prid() & PRID_REV_MASK;
+	sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
+	soc_type = SYS_SOC_TYPE(sys_rev);
+	soc_pass = G_SYS_REVISION(sys_rev);
+
+	if (sys_rev_decode()) {
+		printk("Restart after failure to identify SiByte chip\n");
+		machine_restart(NULL);
+	}
+
+	plldiv = G_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
+	zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
+
+	printk("Broadcom SiByte %s %s @ %d MHz (SB1 rev %d)\n",
+		    soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
+	printk("Board type: %s\n", get_system_type());
+
+	switch (war_pass) {
+	case K_SYS_REVISION_BCM1250_PASS1:
+		printk("@@@@ This is a BCM1250 A0-A2 (Pass 1) board, "
+			    "and the kernel doesn't have the proper "
+			    "workarounds compiled in. @@@@\n");
+		bad_config = 1;
+		break;
+	case K_SYS_REVISION_BCM1250_PASS2:
+		/* Pass 2 - easiest as default for now - so many numbers */
+#if !defined(CONFIG_SB1_PASS_2_WORKAROUNDS) || \
+    !defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS)
+		printk("@@@@ This is a BCM1250 A3-A10 board, and the "
+			    "kernel doesn't have the proper workarounds "
+			    "compiled in. @@@@\n");
+		bad_config = 1;
+#endif
+#ifdef CONFIG_CPU_HAS_PREFETCH
+		printk("@@@@ Prefetches may be enabled in this kernel, "
+			    "but are buggy on this board.  @@@@\n");
+		bad_config = 1;
+#endif
+		break;
+	case K_SYS_REVISION_BCM1250_PASS2_2:
+#ifndef CONFIG_SB1_PASS_2_WORKAROUNDS
+		printk("@@@@ This is a BCM1250 B1/B2. board, and the "
+			    "kernel doesn't have the proper workarounds "
+			    "compiled in. @@@@\n");
+		bad_config = 1;
+#endif
+#if defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS) || \
+    !defined(CONFIG_CPU_HAS_PREFETCH)
+		printk("@@@@ This is a BCM1250 B1/B2, but the kernel is "
+			    "conservatively configured for an 'A' stepping. "
+			    "@@@@\n");
+#endif
+		break;
+	default:
+		break;
+	}
+	if (bad_config) {
+		printk("Invalid configuration for this chip.\n");
+		machine_restart(NULL);
+	}
+}
diff --git a/arch/mips/sibyte/sb1250/smp.c b/arch/mips/sibyte/sb1250/smp.c
new file mode 100644
index 000000000..7a794234e
--- /dev/null
+++ b/arch/mips/sibyte/sb1250/smp.c
@@ -0,0 +1,168 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2001, 2002, 2003 Broadcom Corporation
+ */
+
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/smp.h>
+#include <linux/kernel_stat.h>
+#include <linux/sched/task_stack.h>
+
+#include <asm/mmu_context.h>
+#include <asm/io.h>
+#include <asm/fw/cfe/cfe_api.h>
+#include <asm/sibyte/sb1250.h>
+#include <asm/sibyte/sb1250_regs.h>
+#include <asm/sibyte/sb1250_int.h>
+
+static void *mailbox_set_regs[] = {
+	IOADDR(A_IMR_CPU0_BASE + R_IMR_MAILBOX_SET_CPU),
+	IOADDR(A_IMR_CPU1_BASE + R_IMR_MAILBOX_SET_CPU)
+};
+
+static void *mailbox_clear_regs[] = {
+	IOADDR(A_IMR_CPU0_BASE + R_IMR_MAILBOX_CLR_CPU),
+	IOADDR(A_IMR_CPU1_BASE + R_IMR_MAILBOX_CLR_CPU)
+};
+
+static void *mailbox_regs[] = {
+	IOADDR(A_IMR_CPU0_BASE + R_IMR_MAILBOX_CPU),
+	IOADDR(A_IMR_CPU1_BASE + R_IMR_MAILBOX_CPU)
+};
+
+/*
+ * SMP init and finish on secondary CPUs
+ */
+void sb1250_smp_init(void)
+{
+	unsigned int imask = STATUSF_IP4 | STATUSF_IP3 | STATUSF_IP2 |
+		STATUSF_IP1 | STATUSF_IP0;
+
+	/* Set interrupt mask, but don't enable */
+	change_c0_status(ST0_IM, imask);
+}
+
+/*
+ * These are routines for dealing with the sb1250 smp capabilities
+ * independent of board/firmware
+ */
+
+/*
+ * Simple enough; everything is set up, so just poke the appropriate mailbox
+ * register, and we should be set
+ */
+static void sb1250_send_ipi_single(int cpu, unsigned int action)
+{
+	__raw_writeq((((u64)action) << 48), mailbox_set_regs[cpu]);
+}
+
+static inline void sb1250_send_ipi_mask(const struct cpumask *mask,
+					unsigned int action)
+{
+	unsigned int i;
+
+	for_each_cpu(i, mask)
+		sb1250_send_ipi_single(i, action);
+}
+
+/*
+ * Code to run on secondary just after probing the CPU
+ */
+static void sb1250_init_secondary(void)
+{
+	extern void sb1250_smp_init(void);
+
+	sb1250_smp_init();
+}
+
+/*
+ * Do any tidying up before marking online and running the idle
+ * loop
+ */
+static void sb1250_smp_finish(void)
+{
+	extern void sb1250_clockevent_init(void);
+
+	sb1250_clockevent_init();
+	local_irq_enable();
+}
+
+/*
+ * Setup the PC, SP, and GP of a secondary processor and start it
+ * running!
+ */
+static int sb1250_boot_secondary(int cpu, struct task_struct *idle)
+{
+	int retval;
+
+	retval = cfe_cpu_start(cpu_logical_map(cpu), &smp_bootstrap,
+			       __KSTK_TOS(idle),
+			       (unsigned long)task_thread_info(idle), 0);
+	if (retval != 0)
+		printk("cfe_start_cpu(%i) returned %i\n" , cpu, retval);
+	return retval;
+}
+
+/*
+ * Use CFE to find out how many CPUs are available, setting up
+ * cpu_possible_mask and the logical/physical mappings.
+ * XXXKW will the boot CPU ever not be physical 0?
+ *
+ * Common setup before any secondaries are started
+ */
+static void __init sb1250_smp_setup(void)
+{
+	int i, num;
+
+	init_cpu_possible(cpumask_of(0));
+	__cpu_number_map[0] = 0;
+	__cpu_logical_map[0] = 0;
+
+	for (i = 1, num = 0; i < NR_CPUS; i++) {
+		if (cfe_cpu_stop(i) == 0) {
+			set_cpu_possible(i, true);
+			__cpu_number_map[i] = ++num;
+			__cpu_logical_map[num] = i;
+		}
+	}
+	printk(KERN_INFO "Detected %i available secondary CPU(s)\n", num);
+}
+
+static void __init sb1250_prepare_cpus(unsigned int max_cpus)
+{
+}
+
+const struct plat_smp_ops sb_smp_ops = {
+	.send_ipi_single	= sb1250_send_ipi_single,
+	.send_ipi_mask		= sb1250_send_ipi_mask,
+	.init_secondary		= sb1250_init_secondary,
+	.smp_finish		= sb1250_smp_finish,
+	.boot_secondary		= sb1250_boot_secondary,
+	.smp_setup		= sb1250_smp_setup,
+	.prepare_cpus		= sb1250_prepare_cpus,
+};
+
+void sb1250_mailbox_interrupt(void)
+{
+	int cpu = smp_processor_id();
+	int irq = K_INT_MBOX_0;
+	unsigned int action;
+
+	kstat_incr_irq_this_cpu(irq);
+	/* Load the mailbox register to figure out what we're supposed to do */
+	action = (____raw_readq(mailbox_regs[cpu]) >> 48) & 0xffff;
+
+	/* Clear the mailbox to clear the interrupt */
+	____raw_writeq(((u64)action) << 48, mailbox_clear_regs[cpu]);
+
+	if (action & SMP_RESCHEDULE_YOURSELF)
+		scheduler_ipi();
+
+	if (action & SMP_CALL_FUNCTION) {
+		irq_enter();
+		generic_smp_call_function_interrupt();
+		irq_exit();
+	}
+}
diff --git a/arch/mips/sibyte/sb1250/time.c b/arch/mips/sibyte/sb1250/time.c
new file mode 100644
index 000000000..8b63000a4
--- /dev/null
+++ b/arch/mips/sibyte/sb1250/time.c
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2000, 2001 Broadcom Corporation
+ */
+#include <linux/init.h>
+
+extern void sb1250_clocksource_init(void);
+extern void sb1250_clockevent_init(void);
+
+void __init plat_time_init(void)
+{
+	sb1250_clocksource_init();
+	sb1250_clockevent_init();
+}