ARM: remove w90x900 platform

This removes the old Winbond w90x900 platform, also known
as Nuvoton NUC900. Wan Zongshun originally contributed
the port and maintained it since then.

From all I can tell, this platform is no longer being used
with modern kernels, based on various indications:

- The supported chips (nuc910/950/960) are no longer marketed
  by the manufacturer

- Newer chips from the same family (nuc97x, nuc980, n329x)
  that are still marketed have Linux BSPs but those were never
  submitted for upstream inclusion.

- The last patch from the platform maintainer was in 2011.

- All patches to w90x900 platform specific files afterwards
  are cleanups that were apparently done without access to
  test hardware.

- Both the website and the email address listed in the
  MAINTAINERS have become unreachable.

Link: https://lore.kernel.org/r/20190809202749.742267-17-arnd@arndb.de
Cc: "Wanzongshun (Vincent)" <wanzongshun@huawei.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 168 deletions

diff --git a/arch/arm/mach-w90x900/time.c b/arch/arm/mach-w90x900/time.c
deleted file mode 100644
index dd20fab9a960..000000000000
--- a/arch/arm/mach-w90x900/time.c
+++ /dev/null
@@ -1,168 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * linux/arch/arm/mach-w90x900/time.c
- *
- * Based on linux/arch/arm/plat-s3c24xx/time.c by Ben Dooks
- *
- * Copyright (c) 2009 Nuvoton technology corporation
- * All rights reserved.
- *
- * Wan ZongShun <mcuos.com@gmail.com>
- */
-
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/err.h>
-#include <linux/clk.h>
-#include <linux/io.h>
-#include <linux/leds.h>
-#include <linux/clocksource.h>
-#include <linux/clockchips.h>
-
-#include <asm/mach-types.h>
-#include <asm/mach/irq.h>
-#include <asm/mach/time.h>
-
-#include <mach/map.h>
-#include "regs-timer.h"
-
-#include "nuc9xx.h"
-
-#define RESETINT	0x1f
-#define PERIOD		(0x01 << 27)
-#define ONESHOT		(0x00 << 27)
-#define COUNTEN		(0x01 << 30)
-#define INTEN		(0x01 << 29)
-
-#define TICKS_PER_SEC	100
-#define PRESCALE	0x63 /* Divider = prescale + 1 */
-
-#define	TDR_SHIFT	24
-
-static unsigned int timer0_load;
-
-static int nuc900_clockevent_shutdown(struct clock_event_device *evt)
-{
-	unsigned int val = __raw_readl(REG_TCSR0) & ~(0x03 << 27);
-
-	__raw_writel(val, REG_TCSR0);
-	return 0;
-}
-
-static int nuc900_clockevent_set_oneshot(struct clock_event_device *evt)
-{
-	unsigned int val = __raw_readl(REG_TCSR0) & ~(0x03 << 27);
-
-	val |= (ONESHOT | COUNTEN | INTEN | PRESCALE);
-
-	__raw_writel(val, REG_TCSR0);
-	return 0;
-}
-
-static int nuc900_clockevent_set_periodic(struct clock_event_device *evt)
-{
-	unsigned int val = __raw_readl(REG_TCSR0) & ~(0x03 << 27);
-
-	__raw_writel(timer0_load, REG_TICR0);
-	val |= (PERIOD | COUNTEN | INTEN | PRESCALE);
-	__raw_writel(val, REG_TCSR0);
-	return 0;
-}
-
-static int nuc900_clockevent_setnextevent(unsigned long evt,
-		struct clock_event_device *clk)
-{
-	unsigned int val;
-
-	__raw_writel(evt, REG_TICR0);
-
-	val = __raw_readl(REG_TCSR0);
-	val |= (COUNTEN | INTEN | PRESCALE);
-	__raw_writel(val, REG_TCSR0);
-
-	return 0;
-}
-
-static struct clock_event_device nuc900_clockevent_device = {
-	.name			= "nuc900-timer0",
-	.features		= CLOCK_EVT_FEAT_PERIODIC |
-				  CLOCK_EVT_FEAT_ONESHOT,
-	.set_state_shutdown	= nuc900_clockevent_shutdown,
-	.set_state_periodic	= nuc900_clockevent_set_periodic,
-	.set_state_oneshot	= nuc900_clockevent_set_oneshot,
-	.tick_resume		= nuc900_clockevent_shutdown,
-	.set_next_event		= nuc900_clockevent_setnextevent,
-	.rating			= 300,
-};
-
-/*IRQ handler for the timer*/
-
-static irqreturn_t nuc900_timer0_interrupt(int irq, void *dev_id)
-{
-	struct clock_event_device *evt = &nuc900_clockevent_device;
-
-	__raw_writel(0x01, REG_TISR); /* clear TIF0 */
-
-	evt->event_handler(evt);
-	return IRQ_HANDLED;
-}
-
-static struct irqaction nuc900_timer0_irq = {
-	.name		= "nuc900-timer0",
-	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
-	.handler	= nuc900_timer0_interrupt,
-};
-
-static void __init nuc900_clockevents_init(void)
-{
-	unsigned int rate;
-	struct clk *clk = clk_get(NULL, "timer0");
-
-	BUG_ON(IS_ERR(clk));
-
-	__raw_writel(0x00, REG_TCSR0);
-
-	clk_enable(clk);
-	rate = clk_get_rate(clk) / (PRESCALE + 1);
-
-	timer0_load = (rate / TICKS_PER_SEC);
-
-	__raw_writel(RESETINT, REG_TISR);
-	setup_irq(IRQ_TIMER0, &nuc900_timer0_irq);
-
-	nuc900_clockevent_device.cpumask = cpumask_of(0);
-
-	clockevents_config_and_register(&nuc900_clockevent_device, rate,
-					0xf, 0xffffffff);
-}
-
-static void __init nuc900_clocksource_init(void)
-{
-	unsigned int val;
-	unsigned int rate;
-	struct clk *clk = clk_get(NULL, "timer1");
-
-	BUG_ON(IS_ERR(clk));
-
-	__raw_writel(0x00, REG_TCSR1);
-
-	clk_enable(clk);
-	rate = clk_get_rate(clk) / (PRESCALE + 1);
-
-	__raw_writel(0xffffffff, REG_TICR1);
-
-	val = __raw_readl(REG_TCSR1);
-	val |= (COUNTEN | PERIOD | PRESCALE);
-	__raw_writel(val, REG_TCSR1);
-
-	clocksource_mmio_init(REG_TDR1, "nuc900-timer1", rate, 200,
-		TDR_SHIFT, clocksource_mmio_readl_down);
-}
-
-void __init nuc900_timer_init(void)
-{
-	nuc900_clocksource_init();
-	nuc900_clockevents_init();
-}