Merge tag 'nds32-for-linus-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/greentime/linux

Pull nds32 architecture support from Greentime Hu:
 "This contains the core nds32 Linux port (including interrupt
  controller driver and timer driver), which has been through seven
  rounds of review on mailing list.

  It is able to boot to shell and passes most LTP-2017 testsuites in
  nds32 AE3XX platform:

    Total Tests: 1901
    Total Skipped Tests: 618
    Total Failures: 78"

Reviewed-by: Arnd Bergmann <arnd@arndb.de>

* tag 'nds32-for-linus-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/greentime/linux: (44 commits)
  nds32: To use the generic dump_stack()
  nds32: fix building failed if using elf toolchain.
  nios2: add ioremap_nocache declaration before include asm-generic/io.h.
  nds32: fix building failed if using older version gcc.
  dt-bindings: timer: Add andestech atcpit100 timer binding doc
  clocksource/drivers/atcpit100: VDSO support
  clocksource/drivers/atcpit100: Add andestech atcpit100 timer
  net: faraday add nds32 support.
  irqchip: Andestech Internal Vector Interrupt Controller driver
  dt-bindings: interrupt-controller: Andestech Internal Vector Interrupt Controller
  dt-bindings: nds32 SoC Bindings
  dt-bindings: nds32 L2 cache controller Bindings
  dt-bindings: nds32 CPU Bindings
  MAINTAINERS: Add nds32
  nds32: Build infrastructure
  nds32: defconfig
  nds32: Miscellaneous header files
  nds32: Device tree support
  nds32: Generic timers support
  nds32: Loadable modules
  ...

1 files changed, 208 insertions, 0 deletions

diff --git a/arch/nds32/kernel/process.c b/arch/nds32/kernel/process.c
new file mode 100644
index 000000000000..65fda986e55f
--- /dev/null
+++ b/arch/nds32/kernel/process.c
@@ -0,0 +1,208 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/sched.h>
+#include <linux/sched/debug.h>
+#include <linux/sched/task_stack.h>
+#include <linux/delay.h>
+#include <linux/kallsyms.h>
+#include <linux/uaccess.h>
+#include <asm/elf.h>
+#include <asm/proc-fns.h>
+#include <linux/ptrace.h>
+#include <linux/reboot.h>
+
+extern void setup_mm_for_reboot(char mode);
+#ifdef CONFIG_PROC_FS
+struct proc_dir_entry *proc_dir_cpu;
+EXPORT_SYMBOL(proc_dir_cpu);
+#endif
+
+extern inline void arch_reset(char mode)
+{
+	if (mode == 's') {
+		/* Use cpu handler, jump to 0 */
+		cpu_reset(0);
+	}
+}
+
+void (*pm_power_off) (void);
+EXPORT_SYMBOL(pm_power_off);
+
+static char reboot_mode_nds32 = 'h';
+
+int __init reboot_setup(char *str)
+{
+	reboot_mode_nds32 = str[0];
+	return 1;
+}
+
+static int cpub_pwroff(void)
+{
+	return 0;
+}
+
+__setup("reboot=", reboot_setup);
+
+void machine_halt(void)
+{
+	cpub_pwroff();
+}
+
+EXPORT_SYMBOL(machine_halt);
+
+void machine_power_off(void)
+{
+	if (pm_power_off)
+		pm_power_off();
+}
+
+EXPORT_SYMBOL(machine_power_off);
+
+void machine_restart(char *cmd)
+{
+	/*
+	 * Clean and disable cache, and turn off interrupts
+	 */
+	cpu_proc_fin();
+
+	/*
+	 * Tell the mm system that we are going to reboot -
+	 * we may need it to insert some 1:1 mappings so that
+	 * soft boot works.
+	 */
+	setup_mm_for_reboot(reboot_mode_nds32);
+
+	/* Execute kernel restart handler call chain */
+	do_kernel_restart(cmd);
+
+	/*
+	 * Now call the architecture specific reboot code.
+	 */
+	arch_reset(reboot_mode_nds32);
+
+	/*
+	 * Whoops - the architecture was unable to reboot.
+	 * Tell the user!
+	 */
+	mdelay(1000);
+	pr_info("Reboot failed -- System halted\n");
+	while (1) ;
+}
+
+EXPORT_SYMBOL(machine_restart);
+
+void show_regs(struct pt_regs *regs)
+{
+	printk("PC is at %pS\n", (void *)instruction_pointer(regs));
+	printk("LP is at %pS\n", (void *)regs->lp);
+	pr_info("pc : [<%08lx>]    lp : [<%08lx>]    %s\n"
+		"sp : %08lx  fp : %08lx  gp : %08lx\n",
+		instruction_pointer(regs),
+		regs->lp, print_tainted(), regs->sp, regs->fp, regs->gp);
+	pr_info("r25: %08lx  r24: %08lx\n", regs->uregs[25], regs->uregs[24]);
+
+	pr_info("r23: %08lx  r22: %08lx  r21: %08lx  r20: %08lx\n",
+		regs->uregs[23], regs->uregs[22],
+		regs->uregs[21], regs->uregs[20]);
+	pr_info("r19: %08lx  r18: %08lx  r17: %08lx  r16: %08lx\n",
+		regs->uregs[19], regs->uregs[18],
+		regs->uregs[17], regs->uregs[16]);
+	pr_info("r15: %08lx  r14: %08lx  r13: %08lx  r12: %08lx\n",
+		regs->uregs[15], regs->uregs[14],
+		regs->uregs[13], regs->uregs[12]);
+	pr_info("r11: %08lx  r10: %08lx  r9 : %08lx  r8 : %08lx\n",
+		regs->uregs[11], regs->uregs[10],
+		regs->uregs[9], regs->uregs[8]);
+	pr_info("r7 : %08lx  r6 : %08lx  r5 : %08lx  r4 : %08lx\n",
+		regs->uregs[7], regs->uregs[6], regs->uregs[5], regs->uregs[4]);
+	pr_info("r3 : %08lx  r2 : %08lx  r1 : %08lx  r0 : %08lx\n",
+		regs->uregs[3], regs->uregs[2], regs->uregs[1], regs->uregs[0]);
+	pr_info("  IRQs o%s  Segment %s\n",
+		interrupts_enabled(regs) ? "n" : "ff",
+		segment_eq(get_fs(), get_ds())? "kernel" : "user");
+}
+
+EXPORT_SYMBOL(show_regs);
+
+void flush_thread(void)
+{
+}
+
+DEFINE_PER_CPU(struct task_struct *, __entry_task);
+
+asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
+int copy_thread(unsigned long clone_flags, unsigned long stack_start,
+	    unsigned long stk_sz, struct task_struct *p)
+{
+	struct pt_regs *childregs = task_pt_regs(p);
+
+	memset(&p->thread.cpu_context, 0, sizeof(struct cpu_context));
+
+	if (unlikely(p->flags & PF_KTHREAD)) {
+		memset(childregs, 0, sizeof(struct pt_regs));
+		/* kernel thread fn */
+		p->thread.cpu_context.r6 = stack_start;
+		/* kernel thread argument */
+		p->thread.cpu_context.r7 = stk_sz;
+	} else {
+		*childregs = *current_pt_regs();
+		if (stack_start)
+			childregs->sp = stack_start;
+		/* child get zero as ret. */
+		childregs->uregs[0] = 0;
+		childregs->osp = 0;
+		if (clone_flags & CLONE_SETTLS)
+			childregs->uregs[25] = childregs->uregs[3];
+	}
+	/* cpu context switching  */
+	p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
+	p->thread.cpu_context.sp = (unsigned long)childregs;
+
+#ifdef CONFIG_HWZOL
+	childregs->lb = 0;
+	childregs->le = 0;
+	childregs->lc = 0;
+#endif
+
+	return 0;
+}
+
+/*
+ * fill in the fpe structure for a core dump...
+ */
+int dump_fpu(struct pt_regs *regs, elf_fpregset_t * fpu)
+{
+	int fpvalid = 0;
+	return fpvalid;
+}
+
+EXPORT_SYMBOL(dump_fpu);
+
+unsigned long get_wchan(struct task_struct *p)
+{
+	unsigned long fp, lr;
+	unsigned long stack_start, stack_end;
+	int count = 0;
+
+	if (!p || p == current || p->state == TASK_RUNNING)
+		return 0;
+
+	if (IS_ENABLED(CONFIG_FRAME_POINTER)) {
+		stack_start = (unsigned long)end_of_stack(p);
+		stack_end = (unsigned long)task_stack_page(p) + THREAD_SIZE;
+
+		fp = thread_saved_fp(p);
+		do {
+			if (fp < stack_start || fp > stack_end)
+				return 0;
+			lr = ((unsigned long *)fp)[0];
+			if (!in_sched_functions(lr))
+				return lr;
+			fp = *(unsigned long *)(fp + 4);
+		} while (count++ < 16);
+	}
+	return 0;
+}
+
+EXPORT_SYMBOL(get_wchan);