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-rw-r--r--arch/mips/sgi-ip30/Makefile9
-rw-r--r--arch/mips/sgi-ip30/Platform5
-rw-r--r--arch/mips/sgi-ip30/ip30-common.h23
-rw-r--r--arch/mips/sgi-ip30/ip30-console.c23
-rw-r--r--arch/mips/sgi-ip30/ip30-irq.c330
-rw-r--r--arch/mips/sgi-ip30/ip30-power.c41
-rw-r--r--arch/mips/sgi-ip30/ip30-setup.c138
-rw-r--r--arch/mips/sgi-ip30/ip30-smp.c149
-rw-r--r--arch/mips/sgi-ip30/ip30-timer.c63
-rw-r--r--arch/mips/sgi-ip30/ip30-xtalk.c186
10 files changed, 967 insertions, 0 deletions
diff --git a/arch/mips/sgi-ip30/Makefile b/arch/mips/sgi-ip30/Makefile
new file mode 100644
index 000000000..18cf561b3
--- /dev/null
+++ b/arch/mips/sgi-ip30/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the IP30 specific kernel interface routines under Linux.
+#
+
+obj-y := ip30-irq.o ip30-power.o ip30-setup.o ip30-timer.o ip30-xtalk.o
+
+obj-$(CONFIG_EARLY_PRINTK) += ip30-console.o
+obj-$(CONFIG_SMP) += ip30-smp.o
diff --git a/arch/mips/sgi-ip30/Platform b/arch/mips/sgi-ip30/Platform
new file mode 100644
index 000000000..f6f11517e
--- /dev/null
+++ b/arch/mips/sgi-ip30/Platform
@@ -0,0 +1,5 @@
+#
+# SGI-IP30 (Octane/Octane2)
+#
+cflags-$(CONFIG_SGI_IP30) += -I$(srctree)/arch/mips/include/asm/mach-ip30
+load-$(CONFIG_SGI_IP30) += 0xa800000020004000
diff --git a/arch/mips/sgi-ip30/ip30-common.h b/arch/mips/sgi-ip30/ip30-common.h
new file mode 100644
index 000000000..7b5db24b6
--- /dev/null
+++ b/arch/mips/sgi-ip30/ip30-common.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __IP30_COMMON_H
+#define __IP30_COMMON_H
+
+/*
+ * Power Switch is wired via BaseIO BRIDGE slot #6.
+ *
+ * ACFail is wired via BaseIO BRIDGE slot #7.
+ */
+#define IP30_POWER_IRQ HEART_L2_INT_POWER_BTN
+
+#define IP30_HEART_L0_IRQ (MIPS_CPU_IRQ_BASE + 2)
+#define IP30_HEART_L1_IRQ (MIPS_CPU_IRQ_BASE + 3)
+#define IP30_HEART_L2_IRQ (MIPS_CPU_IRQ_BASE + 4)
+#define IP30_HEART_TIMER_IRQ (MIPS_CPU_IRQ_BASE + 5)
+#define IP30_HEART_ERR_IRQ (MIPS_CPU_IRQ_BASE + 6)
+
+extern void __init ip30_install_ipi(void);
+extern struct plat_smp_ops ip30_smp_ops;
+extern void __init ip30_per_cpu_init(void);
+
+#endif /* __IP30_COMMON_H */
diff --git a/arch/mips/sgi-ip30/ip30-console.c b/arch/mips/sgi-ip30/ip30-console.c
new file mode 100644
index 000000000..b91f8c4fd
--- /dev/null
+++ b/arch/mips/sgi-ip30/ip30-console.c
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/io.h>
+
+#include <asm/sn/ioc3.h>
+
+static inline struct ioc3_uartregs *console_uart(void)
+{
+ struct ioc3 *ioc3;
+
+ ioc3 = (struct ioc3 *)((void *)(0x900000001f600000));
+ return &ioc3->sregs.uarta;
+}
+
+void prom_putchar(char c)
+{
+ struct ioc3_uartregs *uart = console_uart();
+
+ while ((readb(&uart->iu_lsr) & 0x20) == 0)
+ cpu_relax();
+
+ writeb(c, &uart->iu_thr);
+}
diff --git a/arch/mips/sgi-ip30/ip30-irq.c b/arch/mips/sgi-ip30/ip30-irq.c
new file mode 100644
index 000000000..423c32cb6
--- /dev/null
+++ b/arch/mips/sgi-ip30/ip30-irq.c
@@ -0,0 +1,330 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ip30-irq.c: Highlevel interrupt handling for IP30 architecture.
+ */
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/percpu.h>
+#include <linux/spinlock.h>
+#include <linux/tick.h>
+#include <linux/types.h>
+
+#include <asm/irq_cpu.h>
+#include <asm/sgi/heart.h>
+
+#include "ip30-common.h"
+
+struct heart_irq_data {
+ u64 *irq_mask;
+ int cpu;
+};
+
+static DECLARE_BITMAP(heart_irq_map, HEART_NUM_IRQS);
+
+static DEFINE_PER_CPU(unsigned long, irq_enable_mask);
+
+static inline int heart_alloc_int(void)
+{
+ int bit;
+
+again:
+ bit = find_first_zero_bit(heart_irq_map, HEART_NUM_IRQS);
+ if (bit >= HEART_NUM_IRQS)
+ return -ENOSPC;
+
+ if (test_and_set_bit(bit, heart_irq_map))
+ goto again;
+
+ return bit;
+}
+
+static void ip30_error_irq(struct irq_desc *desc)
+{
+ u64 pending, mask, cause, error_irqs, err_reg;
+ int cpu = smp_processor_id();
+ int i;
+
+ pending = heart_read(&heart_regs->isr);
+ mask = heart_read(&heart_regs->imr[cpu]);
+ cause = heart_read(&heart_regs->cause);
+ error_irqs = (pending & HEART_L4_INT_MASK & mask);
+
+ /* Bail if there's nothing to process (how did we get here, then?) */
+ if (unlikely(!error_irqs))
+ return;
+
+ /* Prevent any of the error IRQs from firing again. */
+ heart_write(mask & ~(pending), &heart_regs->imr[cpu]);
+
+ /* Ack all error IRQs. */
+ heart_write(HEART_L4_INT_MASK, &heart_regs->clear_isr);
+
+ /*
+ * If we also have a cause value, then something happened, so loop
+ * through the error IRQs and report a "heart attack" for each one
+ * and print the value of the HEART cause register. This is really
+ * primitive right now, but it should hopefully work until a more
+ * robust error handling routine can be put together.
+ *
+ * Refer to heart.h for the HC_* macros to work out the cause
+ * that got us here.
+ */
+ if (cause) {
+ pr_alert("IP30: CPU%d: HEART ATTACK! ISR = 0x%.16llx, IMR = 0x%.16llx, CAUSE = 0x%.16llx\n",
+ cpu, pending, mask, cause);
+
+ if (cause & HC_COR_MEM_ERR) {
+ err_reg = heart_read(&heart_regs->mem_err_addr);
+ pr_alert(" HEART_MEMERR_ADDR = 0x%.16llx\n", err_reg);
+ }
+
+ /* i = 63; i >= 51; i-- */
+ for (i = HEART_ERR_MASK_END; i >= HEART_ERR_MASK_START; i--)
+ if ((pending >> i) & 1)
+ pr_alert(" HEART Error IRQ #%d\n", i);
+
+ /* XXX: Seems possible to loop forever here, so panic(). */
+ panic("IP30: Fatal Error !\n");
+ }
+
+ /* Unmask the error IRQs. */
+ heart_write(mask, &heart_regs->imr[cpu]);
+}
+
+static void ip30_normal_irq(struct irq_desc *desc)
+{
+ int cpu = smp_processor_id();
+ struct irq_domain *domain;
+ u64 pend, mask;
+ int ret;
+
+ pend = heart_read(&heart_regs->isr);
+ mask = (heart_read(&heart_regs->imr[cpu]) &
+ (HEART_L0_INT_MASK | HEART_L1_INT_MASK | HEART_L2_INT_MASK));
+
+ pend &= mask;
+ if (unlikely(!pend))
+ return;
+
+#ifdef CONFIG_SMP
+ if (pend & BIT_ULL(HEART_L2_INT_RESCHED_CPU_0)) {
+ heart_write(BIT_ULL(HEART_L2_INT_RESCHED_CPU_0),
+ &heart_regs->clear_isr);
+ scheduler_ipi();
+ } else if (pend & BIT_ULL(HEART_L2_INT_RESCHED_CPU_1)) {
+ heart_write(BIT_ULL(HEART_L2_INT_RESCHED_CPU_1),
+ &heart_regs->clear_isr);
+ scheduler_ipi();
+ } else if (pend & BIT_ULL(HEART_L2_INT_CALL_CPU_0)) {
+ heart_write(BIT_ULL(HEART_L2_INT_CALL_CPU_0),
+ &heart_regs->clear_isr);
+ generic_smp_call_function_interrupt();
+ } else if (pend & BIT_ULL(HEART_L2_INT_CALL_CPU_1)) {
+ heart_write(BIT_ULL(HEART_L2_INT_CALL_CPU_1),
+ &heart_regs->clear_isr);
+ generic_smp_call_function_interrupt();
+ } else
+#endif
+ {
+ domain = irq_desc_get_handler_data(desc);
+ ret = generic_handle_domain_irq(domain, __ffs(pend));
+ if (ret)
+ spurious_interrupt();
+ }
+}
+
+static void ip30_ack_heart_irq(struct irq_data *d)
+{
+ heart_write(BIT_ULL(d->hwirq), &heart_regs->clear_isr);
+}
+
+static void ip30_mask_heart_irq(struct irq_data *d)
+{
+ struct heart_irq_data *hd = irq_data_get_irq_chip_data(d);
+ unsigned long *mask = &per_cpu(irq_enable_mask, hd->cpu);
+
+ clear_bit(d->hwirq, mask);
+ heart_write(*mask, &heart_regs->imr[hd->cpu]);
+}
+
+static void ip30_mask_and_ack_heart_irq(struct irq_data *d)
+{
+ struct heart_irq_data *hd = irq_data_get_irq_chip_data(d);
+ unsigned long *mask = &per_cpu(irq_enable_mask, hd->cpu);
+
+ clear_bit(d->hwirq, mask);
+ heart_write(*mask, &heart_regs->imr[hd->cpu]);
+ heart_write(BIT_ULL(d->hwirq), &heart_regs->clear_isr);
+}
+
+static void ip30_unmask_heart_irq(struct irq_data *d)
+{
+ struct heart_irq_data *hd = irq_data_get_irq_chip_data(d);
+ unsigned long *mask = &per_cpu(irq_enable_mask, hd->cpu);
+
+ set_bit(d->hwirq, mask);
+ heart_write(*mask, &heart_regs->imr[hd->cpu]);
+}
+
+static int ip30_set_heart_irq_affinity(struct irq_data *d,
+ const struct cpumask *mask, bool force)
+{
+ struct heart_irq_data *hd = irq_data_get_irq_chip_data(d);
+
+ if (!hd)
+ return -EINVAL;
+
+ if (irqd_is_started(d))
+ ip30_mask_and_ack_heart_irq(d);
+
+ hd->cpu = cpumask_first_and(mask, cpu_online_mask);
+
+ if (irqd_is_started(d))
+ ip30_unmask_heart_irq(d);
+
+ irq_data_update_effective_affinity(d, cpumask_of(hd->cpu));
+
+ return 0;
+}
+
+static struct irq_chip heart_irq_chip = {
+ .name = "HEART",
+ .irq_ack = ip30_ack_heart_irq,
+ .irq_mask = ip30_mask_heart_irq,
+ .irq_mask_ack = ip30_mask_and_ack_heart_irq,
+ .irq_unmask = ip30_unmask_heart_irq,
+ .irq_set_affinity = ip30_set_heart_irq_affinity,
+};
+
+static int heart_domain_alloc(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs, void *arg)
+{
+ struct irq_alloc_info *info = arg;
+ struct heart_irq_data *hd;
+ int hwirq;
+
+ if (nr_irqs > 1 || !info)
+ return -EINVAL;
+
+ hd = kzalloc(sizeof(*hd), GFP_KERNEL);
+ if (!hd)
+ return -ENOMEM;
+
+ hwirq = heart_alloc_int();
+ if (hwirq < 0) {
+ kfree(hd);
+ return -EAGAIN;
+ }
+ irq_domain_set_info(domain, virq, hwirq, &heart_irq_chip, hd,
+ handle_level_irq, NULL, NULL);
+
+ return 0;
+}
+
+static void heart_domain_free(struct irq_domain *domain,
+ unsigned int virq, unsigned int nr_irqs)
+{
+ struct irq_data *irqd;
+
+ if (nr_irqs > 1)
+ return;
+
+ irqd = irq_domain_get_irq_data(domain, virq);
+ if (irqd) {
+ clear_bit(irqd->hwirq, heart_irq_map);
+ kfree(irqd->chip_data);
+ }
+}
+
+static const struct irq_domain_ops heart_domain_ops = {
+ .alloc = heart_domain_alloc,
+ .free = heart_domain_free,
+};
+
+void __init ip30_install_ipi(void)
+{
+ int cpu = smp_processor_id();
+ unsigned long *mask = &per_cpu(irq_enable_mask, cpu);
+
+ set_bit(HEART_L2_INT_RESCHED_CPU_0 + cpu, mask);
+ heart_write(BIT_ULL(HEART_L2_INT_RESCHED_CPU_0 + cpu),
+ &heart_regs->clear_isr);
+ set_bit(HEART_L2_INT_CALL_CPU_0 + cpu, mask);
+ heart_write(BIT_ULL(HEART_L2_INT_CALL_CPU_0 + cpu),
+ &heart_regs->clear_isr);
+
+ heart_write(*mask, &heart_regs->imr[cpu]);
+}
+
+void __init arch_init_irq(void)
+{
+ struct irq_domain *domain;
+ struct fwnode_handle *fn;
+ unsigned long *mask;
+ int i;
+
+ mips_cpu_irq_init();
+
+ /* Mask all IRQs. */
+ heart_write(HEART_CLR_ALL_MASK, &heart_regs->imr[0]);
+ heart_write(HEART_CLR_ALL_MASK, &heart_regs->imr[1]);
+ heart_write(HEART_CLR_ALL_MASK, &heart_regs->imr[2]);
+ heart_write(HEART_CLR_ALL_MASK, &heart_regs->imr[3]);
+
+ /* Ack everything. */
+ heart_write(HEART_ACK_ALL_MASK, &heart_regs->clear_isr);
+
+ /* Enable specific HEART error IRQs for each CPU. */
+ mask = &per_cpu(irq_enable_mask, 0);
+ *mask |= HEART_CPU0_ERR_MASK;
+ heart_write(*mask, &heart_regs->imr[0]);
+ mask = &per_cpu(irq_enable_mask, 1);
+ *mask |= HEART_CPU1_ERR_MASK;
+ heart_write(*mask, &heart_regs->imr[1]);
+
+ /*
+ * Some HEART bits are reserved by hardware or by software convention.
+ * Mark these as reserved right away so they won't be accidentally
+ * used later.
+ */
+ set_bit(HEART_L0_INT_GENERIC, heart_irq_map);
+ set_bit(HEART_L0_INT_FLOW_CTRL_HWTR_0, heart_irq_map);
+ set_bit(HEART_L0_INT_FLOW_CTRL_HWTR_1, heart_irq_map);
+ set_bit(HEART_L2_INT_RESCHED_CPU_0, heart_irq_map);
+ set_bit(HEART_L2_INT_RESCHED_CPU_1, heart_irq_map);
+ set_bit(HEART_L2_INT_CALL_CPU_0, heart_irq_map);
+ set_bit(HEART_L2_INT_CALL_CPU_1, heart_irq_map);
+ set_bit(HEART_L3_INT_TIMER, heart_irq_map);
+
+ /* Reserve the error interrupts (#51 to #63). */
+ for (i = HEART_L4_INT_XWID_ERR_9; i <= HEART_L4_INT_HEART_EXCP; i++)
+ set_bit(i, heart_irq_map);
+
+ fn = irq_domain_alloc_named_fwnode("HEART");
+ WARN_ON(fn == NULL);
+ if (!fn)
+ return;
+ domain = irq_domain_create_linear(fn, HEART_NUM_IRQS,
+ &heart_domain_ops, NULL);
+ WARN_ON(domain == NULL);
+ if (!domain)
+ return;
+
+ irq_set_default_host(domain);
+
+ irq_set_percpu_devid(IP30_HEART_L0_IRQ);
+ irq_set_chained_handler_and_data(IP30_HEART_L0_IRQ, ip30_normal_irq,
+ domain);
+ irq_set_percpu_devid(IP30_HEART_L1_IRQ);
+ irq_set_chained_handler_and_data(IP30_HEART_L1_IRQ, ip30_normal_irq,
+ domain);
+ irq_set_percpu_devid(IP30_HEART_L2_IRQ);
+ irq_set_chained_handler_and_data(IP30_HEART_L2_IRQ, ip30_normal_irq,
+ domain);
+ irq_set_percpu_devid(IP30_HEART_ERR_IRQ);
+ irq_set_chained_handler_and_data(IP30_HEART_ERR_IRQ, ip30_error_irq,
+ domain);
+}
diff --git a/arch/mips/sgi-ip30/ip30-power.c b/arch/mips/sgi-ip30/ip30-power.c
new file mode 100644
index 000000000..120b3f3d5
--- /dev/null
+++ b/arch/mips/sgi-ip30/ip30-power.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ip30-power.c: Software powerdown and reset handling for IP30 architecture.
+ *
+ * Copyright (C) 2004-2007 Stanislaw Skowronek <skylark@unaligned.org>
+ * 2014 Joshua Kinard <kumba@gentoo.org>
+ * 2009 Johannes Dickgreber <tanzy@gmx.de>
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/notifier.h>
+#include <linux/delay.h>
+#include <linux/rtc/ds1685.h>
+#include <linux/interrupt.h>
+#include <linux/pm.h>
+
+#include <asm/reboot.h>
+#include <asm/sgi/heart.h>
+
+static void __noreturn ip30_machine_restart(char *cmd)
+{
+ /*
+ * Execute HEART cold reset
+ * Yes, it's cold-HEARTed!
+ */
+ heart_write((heart_read(&heart_regs->mode) | HM_COLD_RST),
+ &heart_regs->mode);
+ unreachable();
+}
+
+static int __init ip30_reboot_setup(void)
+{
+ _machine_restart = ip30_machine_restart;
+
+ return 0;
+}
+
+subsys_initcall(ip30_reboot_setup);
diff --git a/arch/mips/sgi-ip30/ip30-setup.c b/arch/mips/sgi-ip30/ip30-setup.c
new file mode 100644
index 000000000..75a34684e
--- /dev/null
+++ b/arch/mips/sgi-ip30/ip30-setup.c
@@ -0,0 +1,138 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * SGI IP30 miscellaneous setup bits.
+ *
+ * Copyright (C) 2004-2007 Stanislaw Skowronek <skylark@unaligned.org>
+ * 2007 Joshua Kinard <kumba@gentoo.org>
+ * 2009 Johannes Dickgreber <tanzy@gmx.de>
+ */
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/percpu.h>
+#include <linux/memblock.h>
+
+#include <asm/smp-ops.h>
+#include <asm/sgialib.h>
+#include <asm/time.h>
+#include <asm/sgi/heart.h>
+
+#include "ip30-common.h"
+
+/* Structure of accessible HEART registers located in XKPHYS space. */
+struct ip30_heart_regs __iomem *heart_regs = HEART_XKPHYS_BASE;
+
+/*
+ * ARCS will report up to the first 1GB of
+ * memory if queried. Anything beyond that
+ * is marked as reserved.
+ */
+#define IP30_MAX_PROM_MEMORY _AC(0x40000000, UL)
+
+/*
+ * Memory in the Octane starts at 512MB
+ */
+#define IP30_MEMORY_BASE _AC(0x20000000, UL)
+
+/*
+ * If using ARCS to probe for memory, then
+ * remaining memory will start at this offset.
+ */
+#define IP30_REAL_MEMORY_START (IP30_MEMORY_BASE + IP30_MAX_PROM_MEMORY)
+
+#define MEM_SHIFT(x) ((x) >> 20)
+
+static void __init ip30_mem_init(void)
+{
+ unsigned long total_mem;
+ phys_addr_t addr;
+ phys_addr_t size;
+ u32 memcfg;
+ int i;
+
+ total_mem = 0;
+ for (i = 0; i < HEART_MEMORY_BANKS; i++) {
+ memcfg = __raw_readl(&heart_regs->mem_cfg.l[i]);
+ if (!(memcfg & HEART_MEMCFG_VALID))
+ continue;
+
+ addr = memcfg & HEART_MEMCFG_ADDR_MASK;
+ addr <<= HEART_MEMCFG_UNIT_SHIFT;
+ addr += IP30_MEMORY_BASE;
+ size = memcfg & HEART_MEMCFG_SIZE_MASK;
+ size >>= HEART_MEMCFG_SIZE_SHIFT;
+ size += 1;
+ size <<= HEART_MEMCFG_UNIT_SHIFT;
+
+ total_mem += size;
+
+ if (addr >= IP30_REAL_MEMORY_START)
+ memblock_phys_free(addr, size);
+ else if ((addr + size) > IP30_REAL_MEMORY_START)
+ memblock_phys_free(IP30_REAL_MEMORY_START,
+ size - IP30_MAX_PROM_MEMORY);
+ }
+ pr_info("Detected %luMB of physical memory.\n", MEM_SHIFT(total_mem));
+}
+
+/**
+ * ip30_cpu_time_init - platform time initialization.
+ */
+static void __init ip30_cpu_time_init(void)
+{
+ int cpu = smp_processor_id();
+ u64 heart_compare;
+ unsigned int start, end;
+ int time_diff;
+
+ heart_compare = (heart_read(&heart_regs->count) +
+ (HEART_CYCLES_PER_SEC / 10));
+ start = read_c0_count();
+ while ((heart_read(&heart_regs->count) - heart_compare) & 0x800000)
+ cpu_relax();
+
+ end = read_c0_count();
+ time_diff = (int)end - (int)start;
+ mips_hpt_frequency = time_diff * 10;
+ pr_info("IP30: CPU%d: %d MHz CPU detected.\n", cpu,
+ (mips_hpt_frequency * 2) / 1000000);
+}
+
+void __init ip30_per_cpu_init(void)
+{
+ /* Disable all interrupts. */
+ clear_c0_status(ST0_IM);
+
+ ip30_cpu_time_init();
+#ifdef CONFIG_SMP
+ ip30_install_ipi();
+#endif
+
+ enable_percpu_irq(IP30_HEART_L0_IRQ, IRQ_TYPE_NONE);
+ enable_percpu_irq(IP30_HEART_L1_IRQ, IRQ_TYPE_NONE);
+ enable_percpu_irq(IP30_HEART_L2_IRQ, IRQ_TYPE_NONE);
+ enable_percpu_irq(IP30_HEART_ERR_IRQ, IRQ_TYPE_NONE);
+}
+
+/**
+ * plat_mem_setup - despite the name, misc setup happens here.
+ */
+void __init plat_mem_setup(void)
+{
+ ip30_mem_init();
+
+ /* XXX: Hard lock on /sbin/init if this flag isn't specified. */
+ prom_flags |= PROM_FLAG_DONT_FREE_TEMP;
+
+#ifdef CONFIG_SMP
+ register_smp_ops(&ip30_smp_ops);
+#else
+ ip30_per_cpu_init();
+#endif
+
+ ioport_resource.start = 0;
+ ioport_resource.end = ~0UL;
+ set_io_port_base(IO_BASE);
+}
diff --git a/arch/mips/sgi-ip30/ip30-smp.c b/arch/mips/sgi-ip30/ip30-smp.c
new file mode 100644
index 000000000..4bfe65460
--- /dev/null
+++ b/arch/mips/sgi-ip30/ip30-smp.c
@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ip30-smp.c: SMP on IP30 architecture.
+ * Based off of the original IP30 SMP code, with inspiration from ip27-smp.c
+ * and smp-bmips.c.
+ *
+ * Copyright (C) 2005-2007 Stanislaw Skowronek <skylark@unaligned.org>
+ * 2006-2007, 2014-2015 Joshua Kinard <kumba@gentoo.org>
+ * 2009 Johannes Dickgreber <tanzy@gmx.de>
+ */
+
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/sched/task_stack.h>
+
+#include <asm/time.h>
+#include <asm/sgi/heart.h>
+
+#include "ip30-common.h"
+
+#define MPCONF_MAGIC 0xbaddeed2
+#define MPCONF_ADDR 0xa800000000000600L
+#define MPCONF_SIZE 0x80
+#define MPCONF(x) (MPCONF_ADDR + (x) * MPCONF_SIZE)
+
+/* HEART can theoretically do 4 CPUs, but only 2 are physically possible */
+#define MP_NCPU 2
+
+struct mpconf {
+ u32 magic;
+ u32 prid;
+ u32 physid;
+ u32 virtid;
+ u32 scachesz;
+ u16 fanloads;
+ u16 res;
+ void *launch;
+ void *rendezvous;
+ u64 res2[3];
+ void *stackaddr;
+ void *lnch_parm;
+ void *rndv_parm;
+ u32 idleflag;
+};
+
+static void ip30_smp_send_ipi_single(int cpu, u32 action)
+{
+ int irq;
+
+ switch (action) {
+ case SMP_RESCHEDULE_YOURSELF:
+ irq = HEART_L2_INT_RESCHED_CPU_0;
+ break;
+ case SMP_CALL_FUNCTION:
+ irq = HEART_L2_INT_CALL_CPU_0;
+ break;
+ default:
+ panic("IP30: Unknown action value in %s!\n", __func__);
+ }
+
+ irq += cpu;
+
+ /* Poke the other CPU -- it's got mail! */
+ heart_write(BIT_ULL(irq), &heart_regs->set_isr);
+}
+
+static void ip30_smp_send_ipi_mask(const struct cpumask *mask, u32 action)
+{
+ u32 i;
+
+ for_each_cpu(i, mask)
+ ip30_smp_send_ipi_single(i, action);
+}
+
+static void __init ip30_smp_setup(void)
+{
+ int i;
+ int ncpu = 0;
+ struct mpconf *mpc;
+
+ init_cpu_possible(cpumask_of(0));
+
+ /* Scan the MPCONF structure and enumerate available CPUs. */
+ for (i = 0; i < MP_NCPU; i++) {
+ mpc = (struct mpconf *)MPCONF(i);
+ if (mpc->magic == MPCONF_MAGIC) {
+ set_cpu_possible(i, true);
+ __cpu_number_map[i] = ++ncpu;
+ __cpu_logical_map[ncpu] = i;
+ pr_info("IP30: Slot: %d, PrID: %.8x, PhyID: %d, VirtID: %d\n",
+ i, mpc->prid, mpc->physid, mpc->virtid);
+ }
+ }
+ pr_info("IP30: Detected %d CPU(s) present.\n", ncpu);
+
+ /*
+ * Set the coherency algorithm to '5' (cacheable coherent
+ * exclusive on write). This is needed on IP30 SMP, especially
+ * for R14000 CPUs, otherwise, instruction bus errors will
+ * occur upon reaching userland.
+ */
+ change_c0_config(CONF_CM_CMASK, CONF_CM_CACHABLE_COW);
+}
+
+static void __init ip30_smp_prepare_cpus(unsigned int max_cpus)
+{
+ /* nothing to do here */
+}
+
+static int __init ip30_smp_boot_secondary(int cpu, struct task_struct *idle)
+{
+ struct mpconf *mpc = (struct mpconf *)MPCONF(cpu);
+
+ /* Stack pointer (sp). */
+ mpc->stackaddr = (void *)__KSTK_TOS(idle);
+
+ /* Global pointer (gp). */
+ mpc->lnch_parm = task_thread_info(idle);
+
+ mb(); /* make sure stack and lparm are written */
+
+ /* Boot CPUx. */
+ mpc->launch = smp_bootstrap;
+
+ /* CPUx now executes smp_bootstrap, then ip30_smp_finish */
+ return 0;
+}
+
+static void __init ip30_smp_init_cpu(void)
+{
+ ip30_per_cpu_init();
+}
+
+static void __init ip30_smp_finish(void)
+{
+ enable_percpu_irq(get_c0_compare_int(), IRQ_TYPE_NONE);
+ local_irq_enable();
+}
+
+struct plat_smp_ops __read_mostly ip30_smp_ops = {
+ .send_ipi_single = ip30_smp_send_ipi_single,
+ .send_ipi_mask = ip30_smp_send_ipi_mask,
+ .smp_setup = ip30_smp_setup,
+ .prepare_cpus = ip30_smp_prepare_cpus,
+ .boot_secondary = ip30_smp_boot_secondary,
+ .init_secondary = ip30_smp_init_cpu,
+ .smp_finish = ip30_smp_finish,
+ .prepare_boot_cpu = ip30_smp_init_cpu,
+};
diff --git a/arch/mips/sgi-ip30/ip30-timer.c b/arch/mips/sgi-ip30/ip30-timer.c
new file mode 100644
index 000000000..d13e10547
--- /dev/null
+++ b/arch/mips/sgi-ip30/ip30-timer.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ip30-timer.c: Clocksource/clockevent support for the
+ * HEART chip in SGI Octane (IP30) systems.
+ *
+ * Copyright (C) 2004-2007 Stanislaw Skowronek <skylark@unaligned.org>
+ * Copyright (C) 2009 Johannes Dickgreber <tanzy@gmx.de>
+ * Copyright (C) 2011 Joshua Kinard <kumba@gentoo.org>
+ */
+
+#include <linux/clocksource.h>
+#include <linux/cpumask.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/percpu.h>
+#include <linux/sched_clock.h>
+
+#include <asm/time.h>
+#include <asm/cevt-r4k.h>
+#include <asm/sgi/heart.h>
+
+static u64 ip30_heart_counter_read(struct clocksource *cs)
+{
+ return heart_read(&heart_regs->count);
+}
+
+struct clocksource ip30_heart_clocksource = {
+ .name = "HEART",
+ .rating = 400,
+ .read = ip30_heart_counter_read,
+ .mask = CLOCKSOURCE_MASK(52),
+ .flags = (CLOCK_SOURCE_IS_CONTINUOUS | CLOCK_SOURCE_VALID_FOR_HRES),
+};
+
+static u64 notrace ip30_heart_read_sched_clock(void)
+{
+ return heart_read(&heart_regs->count);
+}
+
+static void __init ip30_heart_clocksource_init(void)
+{
+ struct clocksource *cs = &ip30_heart_clocksource;
+
+ clocksource_register_hz(cs, HEART_CYCLES_PER_SEC);
+
+ sched_clock_register(ip30_heart_read_sched_clock, 52,
+ HEART_CYCLES_PER_SEC);
+}
+
+void __init plat_time_init(void)
+{
+ int irq = get_c0_compare_int();
+
+ cp0_timer_irq_installed = 1;
+ c0_compare_irqaction.percpu_dev_id = &mips_clockevent_device;
+ c0_compare_irqaction.flags &= ~IRQF_SHARED;
+ irq_set_handler(irq, handle_percpu_devid_irq);
+ irq_set_percpu_devid(irq);
+ setup_percpu_irq(irq, &c0_compare_irqaction);
+ enable_percpu_irq(irq, IRQ_TYPE_NONE);
+
+ ip30_heart_clocksource_init();
+}
diff --git a/arch/mips/sgi-ip30/ip30-xtalk.c b/arch/mips/sgi-ip30/ip30-xtalk.c
new file mode 100644
index 000000000..7ceb2b23e
--- /dev/null
+++ b/arch/mips/sgi-ip30/ip30-xtalk.c
@@ -0,0 +1,186 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ip30-xtalk.c - Very basic Crosstalk (XIO) detection support.
+ * Copyright (C) 2004-2007 Stanislaw Skowronek <skylark@unaligned.org>
+ * Copyright (C) 2009 Johannes Dickgreber <tanzy@gmx.de>
+ * Copyright (C) 2007, 2014-2016 Joshua Kinard <kumba@gentoo.org>
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/sgi-w1.h>
+#include <linux/platform_data/xtalk-bridge.h>
+
+#include <asm/xtalk/xwidget.h>
+#include <asm/pci/bridge.h>
+
+#define IP30_SWIN_BASE(widget) \
+ (0x0000000010000000 | (((unsigned long)(widget)) << 24))
+
+#define IP30_RAW_SWIN_BASE(widget) (IO_BASE + IP30_SWIN_BASE(widget))
+
+#define IP30_SWIN_SIZE (1 << 24)
+
+#define IP30_WIDGET_XBOW _AC(0x0, UL) /* XBow is always 0 */
+#define IP30_WIDGET_HEART _AC(0x8, UL) /* HEART is always 8 */
+#define IP30_WIDGET_PCI_BASE _AC(0xf, UL) /* BaseIO PCI is always 15 */
+
+#define XTALK_NODEV 0xffffffff
+
+#define XBOW_REG_LINK_STAT_0 0x114
+#define XBOW_REG_LINK_BLK_SIZE 0x40
+#define XBOW_REG_LINK_ALIVE 0x80000000
+
+#define HEART_INTR_ADDR 0x00000080
+
+#define xtalk_read __raw_readl
+
+static void bridge_platform_create(int widget, int masterwid)
+{
+ struct xtalk_bridge_platform_data *bd;
+ struct sgi_w1_platform_data *wd;
+ struct platform_device *pdev_wd;
+ struct platform_device *pdev_bd;
+ struct resource w1_res;
+
+ wd = kzalloc(sizeof(*wd), GFP_KERNEL);
+ if (!wd) {
+ pr_warn("xtalk:%x bridge create out of memory\n", widget);
+ return;
+ }
+
+ snprintf(wd->dev_id, sizeof(wd->dev_id), "bridge-%012lx",
+ IP30_SWIN_BASE(widget));
+
+ memset(&w1_res, 0, sizeof(w1_res));
+ w1_res.start = IP30_SWIN_BASE(widget) +
+ offsetof(struct bridge_regs, b_nic);
+ w1_res.end = w1_res.start + 3;
+ w1_res.flags = IORESOURCE_MEM;
+
+ pdev_wd = platform_device_alloc("sgi_w1", PLATFORM_DEVID_AUTO);
+ if (!pdev_wd) {
+ pr_warn("xtalk:%x bridge create out of memory\n", widget);
+ goto err_kfree_wd;
+ }
+ if (platform_device_add_resources(pdev_wd, &w1_res, 1)) {
+ pr_warn("xtalk:%x bridge failed to add platform resources.\n", widget);
+ goto err_put_pdev_wd;
+ }
+ if (platform_device_add_data(pdev_wd, wd, sizeof(*wd))) {
+ pr_warn("xtalk:%x bridge failed to add platform data.\n", widget);
+ goto err_put_pdev_wd;
+ }
+ if (platform_device_add(pdev_wd)) {
+ pr_warn("xtalk:%x bridge failed to add platform device.\n", widget);
+ goto err_put_pdev_wd;
+ }
+ /* platform_device_add_data() duplicates the data */
+ kfree(wd);
+
+ bd = kzalloc(sizeof(*bd), GFP_KERNEL);
+ if (!bd) {
+ pr_warn("xtalk:%x bridge create out of memory\n", widget);
+ goto err_unregister_pdev_wd;
+ }
+ pdev_bd = platform_device_alloc("xtalk-bridge", PLATFORM_DEVID_AUTO);
+ if (!pdev_bd) {
+ pr_warn("xtalk:%x bridge create out of memory\n", widget);
+ goto err_kfree_bd;
+ }
+
+ bd->bridge_addr = IP30_RAW_SWIN_BASE(widget);
+ bd->intr_addr = HEART_INTR_ADDR;
+ bd->nasid = 0;
+ bd->masterwid = masterwid;
+
+ bd->mem.name = "Bridge PCI MEM";
+ bd->mem.start = IP30_SWIN_BASE(widget) + BRIDGE_DEVIO0;
+ bd->mem.end = IP30_SWIN_BASE(widget) + IP30_SWIN_SIZE - 1;
+ bd->mem.flags = IORESOURCE_MEM;
+ bd->mem_offset = IP30_SWIN_BASE(widget);
+
+ bd->io.name = "Bridge PCI IO";
+ bd->io.start = IP30_SWIN_BASE(widget) + BRIDGE_DEVIO0;
+ bd->io.end = IP30_SWIN_BASE(widget) + IP30_SWIN_SIZE - 1;
+ bd->io.flags = IORESOURCE_IO;
+ bd->io_offset = IP30_SWIN_BASE(widget);
+
+ if (platform_device_add_data(pdev_bd, bd, sizeof(*bd))) {
+ pr_warn("xtalk:%x bridge failed to add platform data.\n", widget);
+ goto err_put_pdev_bd;
+ }
+ if (platform_device_add(pdev_bd)) {
+ pr_warn("xtalk:%x bridge failed to add platform device.\n", widget);
+ goto err_put_pdev_bd;
+ }
+ /* platform_device_add_data() duplicates the data */
+ kfree(bd);
+ pr_info("xtalk:%x bridge widget\n", widget);
+ return;
+
+err_put_pdev_bd:
+ platform_device_put(pdev_bd);
+err_kfree_bd:
+ kfree(bd);
+err_unregister_pdev_wd:
+ platform_device_unregister(pdev_wd);
+ return;
+err_put_pdev_wd:
+ platform_device_put(pdev_wd);
+err_kfree_wd:
+ kfree(wd);
+ return;
+}
+
+static unsigned int __init xbow_widget_active(s8 wid)
+{
+ unsigned int link_stat;
+
+ link_stat = xtalk_read((void *)(IP30_RAW_SWIN_BASE(IP30_WIDGET_XBOW) +
+ XBOW_REG_LINK_STAT_0 +
+ XBOW_REG_LINK_BLK_SIZE *
+ (wid - 8)));
+
+ return (link_stat & XBOW_REG_LINK_ALIVE) ? 1 : 0;
+}
+
+static void __init xtalk_init_widget(s8 wid, s8 masterwid)
+{
+ xwidget_part_num_t partnum;
+ widgetreg_t widget_id;
+
+ if (!xbow_widget_active(wid))
+ return;
+
+ widget_id = xtalk_read((void *)(IP30_RAW_SWIN_BASE(wid) + WIDGET_ID));
+
+ partnum = XWIDGET_PART_NUM(widget_id);
+
+ switch (partnum) {
+ case BRIDGE_WIDGET_PART_NUM:
+ case XBRIDGE_WIDGET_PART_NUM:
+ bridge_platform_create(wid, masterwid);
+ break;
+ default:
+ pr_info("xtalk:%x unknown widget (0x%x)\n", wid, partnum);
+ break;
+ }
+}
+
+static int __init ip30_xtalk_init(void)
+{
+ int i;
+
+ /*
+ * Walk widget IDs backwards so that BaseIO is probed first. This
+ * ensures that the BaseIO IOC3 is always detected as eth0.
+ */
+ for (i = IP30_WIDGET_PCI_BASE; i > IP30_WIDGET_HEART; i--)
+ xtalk_init_widget(i, IP30_WIDGET_HEART);
+
+ return 0;
+}
+
+arch_initcall(ip30_xtalk_init);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-01 18:20:35 +0000