arch: remove blackfin port

The Analog Devices Blackfin port was added in 2007 and was rather
active for a while, but all work on it has come to a standstill
over time, as Analog have changed their product line-up.

Aaron Wu confirmed that the architecture port is no longer relevant,
and multiple people suggested removing blackfin independently because
of some of its oddities like a non-working SMP port, and the amount of
duplication between the chip variants, which cause extra work when
doing cross-architecture changes.

Link: https://docs.blackfin.uclinux.org/
Acked-by: Aaron Wu <Aaron.Wu@analog.com>
Acked-by: Bryan Wu <cooloney@gmail.com>
Cc: Steven Miao <realmz6@gmail.com>
Cc: Mike Frysinger <vapier@chromium.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 287 deletions

diff --git a/arch/blackfin/kernel/nmi.c b/arch/blackfin/kernel/nmi.c
deleted file mode 100644
index 8a211d95821f..000000000000
--- a/arch/blackfin/kernel/nmi.c
+++ /dev/null
@@ -1,287 +0,0 @@
-/*
- * Blackfin nmi_watchdog Driver
- *
- * Originally based on bfin_wdt.c
- * Copyright 2010-2010 Analog Devices Inc.
- *		Graff Yang <graf.yang@analog.com>
- *
- * Enter bugs at http://blackfin.uclinux.org/
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/bitops.h>
-#include <linux/hardirq.h>
-#include <linux/syscore_ops.h>
-#include <linux/pm.h>
-#include <linux/nmi.h>
-#include <linux/smp.h>
-#include <linux/timer.h>
-#include <linux/sched/debug.h>
-#include <asm/blackfin.h>
-#include <linux/atomic.h>
-#include <asm/cacheflush.h>
-#include <asm/bfin_watchdog.h>
-
-#define DRV_NAME "nmi-wdt"
-
-#define NMI_WDT_TIMEOUT 5          /* 5 seconds */
-#define NMI_CHECK_TIMEOUT (4 * HZ) /* 4 seconds in jiffies */
-static int nmi_wdt_cpu = 1;
-
-static unsigned int timeout = NMI_WDT_TIMEOUT;
-static int nmi_active;
-
-static unsigned short wdoga_ctl;
-static unsigned int wdoga_cnt;
-static struct corelock_slot saved_corelock;
-static atomic_t nmi_touched[NR_CPUS];
-static struct timer_list ntimer;
-
-enum {
-	COREA_ENTER_NMI = 0,
-	COREA_EXIT_NMI,
-	COREB_EXIT_NMI,
-
-	NMI_EVENT_NR,
-};
-static unsigned long nmi_event __attribute__ ((__section__(".l2.bss")));
-
-/* we are in nmi, non-atomic bit ops is safe */
-static inline void set_nmi_event(int event)
-{
-	__set_bit(event, &nmi_event);
-}
-
-static inline void wait_nmi_event(int event)
-{
-	while (!test_bit(event, &nmi_event))
-		barrier();
-	__clear_bit(event, &nmi_event);
-}
-
-static inline void send_corea_nmi(void)
-{
-	wdoga_ctl = bfin_read_WDOGA_CTL();
-	wdoga_cnt = bfin_read_WDOGA_CNT();
-
-	bfin_write_WDOGA_CTL(WDEN_DISABLE);
-	bfin_write_WDOGA_CNT(0);
-	bfin_write_WDOGA_CTL(WDEN_ENABLE | ICTL_NMI);
-}
-
-static inline void restore_corea_nmi(void)
-{
-	bfin_write_WDOGA_CTL(WDEN_DISABLE);
-	bfin_write_WDOGA_CTL(WDOG_EXPIRED | WDEN_DISABLE | ICTL_NONE);
-
-	bfin_write_WDOGA_CNT(wdoga_cnt);
-	bfin_write_WDOGA_CTL(wdoga_ctl);
-}
-
-static inline void save_corelock(void)
-{
-	saved_corelock = corelock;
-	corelock.lock = 0;
-}
-
-static inline void restore_corelock(void)
-{
-	corelock = saved_corelock;
-}
-
-
-static inline void nmi_wdt_keepalive(void)
-{
-	bfin_write_WDOGB_STAT(0);
-}
-
-static inline void nmi_wdt_stop(void)
-{
-	bfin_write_WDOGB_CTL(WDEN_DISABLE);
-}
-
-/* before calling this function, you must stop the WDT */
-static inline void nmi_wdt_clear(void)
-{
-	/* clear TRO bit, disable event generation */
-	bfin_write_WDOGB_CTL(WDOG_EXPIRED | WDEN_DISABLE | ICTL_NONE);
-}
-
-static inline void nmi_wdt_start(void)
-{
-	bfin_write_WDOGB_CTL(WDEN_ENABLE | ICTL_NMI);
-}
-
-static inline int nmi_wdt_running(void)
-{
-	return ((bfin_read_WDOGB_CTL() & WDEN_MASK) != WDEN_DISABLE);
-}
-
-static inline int nmi_wdt_set_timeout(unsigned long t)
-{
-	u32 cnt, max_t, sclk;
-	int run;
-
-	sclk = get_sclk();
-	max_t = -1 / sclk;
-	cnt = t * sclk;
-	if (t > max_t) {
-		pr_warning("NMI: timeout value is too large\n");
-		return -EINVAL;
-	}
-
-	run = nmi_wdt_running();
-	nmi_wdt_stop();
-	bfin_write_WDOGB_CNT(cnt);
-	if (run)
-		nmi_wdt_start();
-
-	timeout = t;
-
-	return 0;
-}
-
-int check_nmi_wdt_touched(void)
-{
-	unsigned int this_cpu = smp_processor_id();
-	unsigned int cpu;
-	cpumask_t mask;
-
-	cpumask_copy(&mask, cpu_online_mask);
-	if (!atomic_read(&nmi_touched[this_cpu]))
-		return 0;
-
-	atomic_set(&nmi_touched[this_cpu], 0);
-
-	cpumask_clear_cpu(this_cpu, &mask);
-	for_each_cpu(cpu, &mask) {
-		invalidate_dcache_range((unsigned long)(&nmi_touched[cpu]),
-				(unsigned long)(&nmi_touched[cpu]));
-		if (!atomic_read(&nmi_touched[cpu]))
-			return 0;
-		atomic_set(&nmi_touched[cpu], 0);
-	}
-
-	return 1;
-}
-
-static void nmi_wdt_timer(struct timer_list *unused)
-{
-	if (check_nmi_wdt_touched())
-		nmi_wdt_keepalive();
-
-	mod_timer(&ntimer, jiffies + NMI_CHECK_TIMEOUT);
-}
-
-static int __init init_nmi_wdt(void)
-{
-	nmi_wdt_set_timeout(timeout);
-	nmi_wdt_start();
-	nmi_active = true;
-
-	timer_setup(&ntimer, nmi_wdt_timer, 0);
-	ntimer.expires = jiffies + NMI_CHECK_TIMEOUT;
-	add_timer(&ntimer);
-
-	pr_info("nmi_wdt: initialized: timeout=%d sec\n", timeout);
-	return 0;
-}
-device_initcall(init_nmi_wdt);
-
-void arch_touch_nmi_watchdog(void)
-{
-	atomic_set(&nmi_touched[smp_processor_id()], 1);
-}
-
-/* Suspend/resume support */
-#ifdef CONFIG_PM
-static int nmi_wdt_suspend(void)
-{
-	nmi_wdt_stop();
-	return 0;
-}
-
-static void nmi_wdt_resume(void)
-{
-	if (nmi_active)
-		nmi_wdt_start();
-}
-
-static struct syscore_ops nmi_syscore_ops = {
-	.resume		= nmi_wdt_resume,
-	.suspend	= nmi_wdt_suspend,
-};
-
-static int __init init_nmi_wdt_syscore(void)
-{
-	if (nmi_active)
-		register_syscore_ops(&nmi_syscore_ops);
-
-	return 0;
-}
-late_initcall(init_nmi_wdt_syscore);
-
-#endif	/* CONFIG_PM */
-
-
-asmlinkage notrace void do_nmi(struct pt_regs *fp)
-{
-	unsigned int cpu = smp_processor_id();
-	nmi_enter();
-
-	cpu_pda[cpu].__nmi_count += 1;
-
-	if (cpu == nmi_wdt_cpu) {
-		/* CoreB goes here first */
-
-		/* reload the WDOG_STAT */
-		nmi_wdt_keepalive();
-
-		/* clear nmi interrupt for CoreB */
-		nmi_wdt_stop();
-		nmi_wdt_clear();
-
-		/* trigger NMI interrupt of CoreA */
-		send_corea_nmi();
-
-		/* waiting CoreB to enter NMI */
-		wait_nmi_event(COREA_ENTER_NMI);
-
-		/* recover WDOGA's settings */
-		restore_corea_nmi();
-
-		save_corelock();
-
-		/* corelock is save/cleared, CoreA is dummping messages */
-
-		wait_nmi_event(COREA_EXIT_NMI);
-	} else {
-		/* OK, CoreA entered NMI */
-		set_nmi_event(COREA_ENTER_NMI);
-	}
-
-	pr_emerg("\nNMI Watchdog detected LOCKUP, dump for CPU %d\n", cpu);
-	dump_bfin_process(fp);
-	dump_bfin_mem(fp);
-	show_regs(fp);
-	dump_bfin_trace_buffer();
-	show_stack(current, (unsigned long *)fp);
-
-	if (cpu == nmi_wdt_cpu) {
-		pr_emerg("This fault is not recoverable, sorry!\n");
-
-		/* CoreA dump finished, restore the corelock */
-		restore_corelock();
-
-		set_nmi_event(COREB_EXIT_NMI);
-	} else {
-		/* CoreB dump finished, notice the CoreA we are done */
-		set_nmi_event(COREA_EXIT_NMI);
-
-		/* synchronize with CoreA */
-		wait_nmi_event(COREB_EXIT_NMI);
-	}
-
-	nmi_exit();
-}