ARM: plat-nomadik: move MTU, kill plat-nomadik

This moves the MTU timer driver from arch/arm/plat-nomadik
to drivers/clocksource and moves the header file to the
platform_data directory.

As this moves the last file being compiled to an object out
of arch/arm/plat-nomadik, we have to "turn off the light"
and delete the plat-nomadik directory, because it is not
allowed to have an empty Makefile in a plat-* directory.
This is probably also a desired side effect of depopulating
the arch/arm directory of drivers. Luckily we have just
deleted all the <plat/*> include files prior to this so
by moving the last one we may delete the directory.

After this all the Ux500 and Nomadik device drivers live
outside of the arch/arm hierarchy.

Cc: Alessandro Rubini <rubini@unipv.it>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

10 files changed, 5 insertions, 277 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index ade7e924bef5..8dae1e016ac8 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1065,7 +1065,6 @@ source "arch/arm/mach-mxs/Kconfig"
 source "arch/arm/mach-netx/Kconfig"
 
 source "arch/arm/mach-nomadik/Kconfig"
-source "arch/arm/plat-nomadik/Kconfig"
 
 source "arch/arm/plat-omap/Kconfig"
 
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 5f914fca911b..89087d599ad2 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -201,7 +201,6 @@ plat-$(CONFIG_ARCH_OMAP)	+= omap
 plat-$(CONFIG_ARCH_S3C64XX)	+= samsung
 plat-$(CONFIG_ARCH_ZYNQ)	+= versatile
 plat-$(CONFIG_PLAT_IOP)		+= iop
-plat-$(CONFIG_PLAT_NOMADIK)	+= nomadik
 plat-$(CONFIG_PLAT_ORION)	+= orion
 plat-$(CONFIG_PLAT_PXA)		+= pxa
 plat-$(CONFIG_PLAT_S3C24XX)	+= s3c24xx samsung
diff --git a/arch/arm/mach-nomadik/Kconfig b/arch/arm/mach-nomadik/Kconfig
index c744946ef022..706dc5727bbe 100644
--- a/arch/arm/mach-nomadik/Kconfig
+++ b/arch/arm/mach-nomadik/Kconfig
@@ -4,7 +4,7 @@ menu "Nomadik boards"
 
 config MACH_NOMADIK_8815NHK
 	bool "ST 8815 Nomadik Hardware Kit (evaluation board)"
-	select HAS_MTU
+	select CLKSRC_NOMADIK_MTU
 	select NOMADIK_8815
 
 endmenu
diff --git a/arch/arm/mach-nomadik/board-nhk8815.c b/arch/arm/mach-nomadik/board-nhk8815.c
index 16f10e04a805..5ccdf53c5a9d 100644
--- a/arch/arm/mach-nomadik/board-nhk8815.c
+++ b/arch/arm/mach-nomadik/board-nhk8815.c
@@ -25,16 +25,14 @@
 #include <linux/io.h>
 #include <linux/pinctrl/machine.h>
 #include <linux/platform_data/pinctrl-nomadik.h>
+#include <linux/platform_data/clocksource-nomadik-mtu.h>
+#include <linux/platform_data/mtd-nomadik-nand.h>
 #include <asm/hardware/vic.h>
 #include <asm/sizes.h>
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
 #include <asm/mach/flash.h>
 #include <asm/mach/time.h>
-
-#include <plat/mtu.h>
-
-#include <linux/platform_data/mtd-nomadik-nand.h>
 #include <mach/fsmc.h>
 #include <mach/irqs.h>
 
diff --git a/arch/arm/mach-ux500/Kconfig b/arch/arm/mach-ux500/Kconfig
index e8c3f0d70ca6..5dea90636d94 100644
--- a/arch/arm/mach-ux500/Kconfig
+++ b/arch/arm/mach-ux500/Kconfig
@@ -7,8 +7,8 @@ config UX500_SOC_COMMON
 	select ARM_ERRATA_764369 if SMP
 	select ARM_GIC
 	select CACHE_L2X0
+	select CLKSRC_NOMADIK_MTU
 	select COMMON_CLK
-	select HAS_MTU
 	select PINCTRL
 	select PINCTRL_NOMADIK
 	select PL310_ERRATA_753970 if CACHE_PL310
diff --git a/arch/arm/mach-ux500/timer.c b/arch/arm/mach-ux500/timer.c
index 20d02fa01ec3..875309acb022 100644
--- a/arch/arm/mach-ux500/timer.c
+++ b/arch/arm/mach-ux500/timer.c
@@ -9,11 +9,10 @@
 #include <linux/clksrc-dbx500-prcmu.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/platform_data/clocksource-nomadik-mtu.h>
 
 #include <asm/smp_twd.h>
 
-#include <plat/mtu.h>
-
 #include <mach/setup.h>
 #include <mach/hardware.h>
 #include <mach/irqs.h>
diff --git a/arch/arm/plat-nomadik/Kconfig b/arch/arm/plat-nomadik/Kconfig
deleted file mode 100644
index 19f55cae5d73..000000000000
--- a/arch/arm/plat-nomadik/Kconfig
+++ /dev/null
@@ -1,29 +0,0 @@
-# We keep common IP's here for Nomadik and other similar
-# familiy of processors from ST-Ericsson. At the moment we have
-# just MTU, others to follow soon.
-
-config PLAT_NOMADIK
-	bool
-	depends on ARCH_NOMADIK || ARCH_U8500
-	default y
-	select CLKSRC_MMIO
-	help
-	  Common platform code for Nomadik and other ST-Ericsson
-	  platforms.
-
-if PLAT_NOMADIK
-
-config HAS_MTU
-	bool
-	help
-	  Support for Multi Timer Unit. MTU provides access
-	  to multiple interrupt generating programmable
-	  32-bit free running decrementing counters.
-
-config NOMADIK_MTU_SCHED_CLOCK
-	bool
-	depends on HAS_MTU
-	help
-	  Use the Multi Timer Unit as the sched_clock.
-
-endif
diff --git a/arch/arm/plat-nomadik/Makefile b/arch/arm/plat-nomadik/Makefile
deleted file mode 100644
index 37c7cdd0f8f0..000000000000
--- a/arch/arm/plat-nomadik/Makefile
+++ /dev/null
@@ -1,5 +0,0 @@
-# arch/arm/plat-nomadik/Makefile
-# Copyright 2009 ST-Ericsson
-# Licensed under GPLv2
-
-obj-$(CONFIG_HAS_MTU)	+= timer.o
diff --git a/arch/arm/plat-nomadik/include/plat/mtu.h b/arch/arm/plat-nomadik/include/plat/mtu.h
deleted file mode 100644
index 80088973b734..000000000000
--- a/arch/arm/plat-nomadik/include/plat/mtu.h
+++ /dev/null
@@ -1,9 +0,0 @@
-#ifndef __PLAT_MTU_H
-#define __PLAT_MTU_H
-
-void nmdk_timer_init(void __iomem *base, int irq);
-void nmdk_clkevt_reset(void);
-void nmdk_clksrc_reset(void);
-
-#endif /* __PLAT_MTU_H */
-
diff --git a/arch/arm/plat-nomadik/timer.c b/arch/arm/plat-nomadik/timer.c
deleted file mode 100644
index f9114306657b..000000000000
--- a/arch/arm/plat-nomadik/timer.c
+++ /dev/null
@@ -1,224 +0,0 @@
-/*
- *  linux/arch/arm/plat-nomadik/timer.c
- *
- * Copyright (C) 2008 STMicroelectronics
- * Copyright (C) 2010 Alessandro Rubini
- * Copyright (C) 2010 Linus Walleij for ST-Ericsson
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2, as
- * published by the Free Software Foundation.
- */
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/io.h>
-#include <linux/clockchips.h>
-#include <linux/clk.h>
-#include <linux/jiffies.h>
-#include <linux/err.h>
-#include <asm/mach/time.h>
-#include <asm/sched_clock.h>
-
-/*
- * The MTU device hosts four different counters, with 4 set of
- * registers. These are register names.
- */
-
-#define MTU_IMSC	0x00	/* Interrupt mask set/clear */
-#define MTU_RIS		0x04	/* Raw interrupt status */
-#define MTU_MIS		0x08	/* Masked interrupt status */
-#define MTU_ICR		0x0C	/* Interrupt clear register */
-
-/* per-timer registers take 0..3 as argument */
-#define MTU_LR(x)	(0x10 + 0x10 * (x) + 0x00)	/* Load value */
-#define MTU_VAL(x)	(0x10 + 0x10 * (x) + 0x04)	/* Current value */
-#define MTU_CR(x)	(0x10 + 0x10 * (x) + 0x08)	/* Control reg */
-#define MTU_BGLR(x)	(0x10 + 0x10 * (x) + 0x0c)	/* At next overflow */
-
-/* bits for the control register */
-#define MTU_CRn_ENA		0x80
-#define MTU_CRn_PERIODIC	0x40	/* if 0 = free-running */
-#define MTU_CRn_PRESCALE_MASK	0x0c
-#define MTU_CRn_PRESCALE_1		0x00
-#define MTU_CRn_PRESCALE_16		0x04
-#define MTU_CRn_PRESCALE_256		0x08
-#define MTU_CRn_32BITS		0x02
-#define MTU_CRn_ONESHOT		0x01	/* if 0 = wraps reloading from BGLR*/
-
-/* Other registers are usual amba/primecell registers, currently not used */
-#define MTU_ITCR	0xff0
-#define MTU_ITOP	0xff4
-
-#define MTU_PERIPH_ID0	0xfe0
-#define MTU_PERIPH_ID1	0xfe4
-#define MTU_PERIPH_ID2	0xfe8
-#define MTU_PERIPH_ID3	0xfeC
-
-#define MTU_PCELL0	0xff0
-#define MTU_PCELL1	0xff4
-#define MTU_PCELL2	0xff8
-#define MTU_PCELL3	0xffC
-
-static void __iomem *mtu_base;
-static bool clkevt_periodic;
-static u32 clk_prescale;
-static u32 nmdk_cycle;		/* write-once */
-
-#ifdef CONFIG_NOMADIK_MTU_SCHED_CLOCK
-/*
- * Override the global weak sched_clock symbol with this
- * local implementation which uses the clocksource to get some
- * better resolution when scheduling the kernel.
- */
-static u32 notrace nomadik_read_sched_clock(void)
-{
-	if (unlikely(!mtu_base))
-		return 0;
-
-	return -readl(mtu_base + MTU_VAL(0));
-}
-#endif
-
-/* Clockevent device: use one-shot mode */
-static int nmdk_clkevt_next(unsigned long evt, struct clock_event_device *ev)
-{
-	writel(1 << 1, mtu_base + MTU_IMSC);
-	writel(evt, mtu_base + MTU_LR(1));
-	/* Load highest value, enable device, enable interrupts */
-	writel(MTU_CRn_ONESHOT | clk_prescale |
-	       MTU_CRn_32BITS | MTU_CRn_ENA,
-	       mtu_base + MTU_CR(1));
-
-	return 0;
-}
-
-void nmdk_clkevt_reset(void)
-{
-	if (clkevt_periodic) {
-		/* Timer: configure load and background-load, and fire it up */
-		writel(nmdk_cycle, mtu_base + MTU_LR(1));
-		writel(nmdk_cycle, mtu_base + MTU_BGLR(1));
-
-		writel(MTU_CRn_PERIODIC | clk_prescale |
-		       MTU_CRn_32BITS | MTU_CRn_ENA,
-		       mtu_base + MTU_CR(1));
-		writel(1 << 1, mtu_base + MTU_IMSC);
-	} else {
-		/* Generate an interrupt to start the clockevent again */
-		(void) nmdk_clkevt_next(nmdk_cycle, NULL);
-	}
-}
-
-static void nmdk_clkevt_mode(enum clock_event_mode mode,
-			     struct clock_event_device *dev)
-{
-	switch (mode) {
-	case CLOCK_EVT_MODE_PERIODIC:
-		clkevt_periodic = true;
-		nmdk_clkevt_reset();
-		break;
-	case CLOCK_EVT_MODE_ONESHOT:
-		clkevt_periodic = false;
-		break;
-	case CLOCK_EVT_MODE_SHUTDOWN:
-	case CLOCK_EVT_MODE_UNUSED:
-		writel(0, mtu_base + MTU_IMSC);
-		/* disable timer */
-		writel(0, mtu_base + MTU_CR(1));
-		/* load some high default value */
-		writel(0xffffffff, mtu_base + MTU_LR(1));
-		break;
-	case CLOCK_EVT_MODE_RESUME:
-		break;
-	}
-}
-
-static struct clock_event_device nmdk_clkevt = {
-	.name		= "mtu_1",
-	.features	= CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_PERIODIC,
-	.rating		= 200,
-	.set_mode	= nmdk_clkevt_mode,
-	.set_next_event	= nmdk_clkevt_next,
-};
-
-/*
- * IRQ Handler for timer 1 of the MTU block.
- */
-static irqreturn_t nmdk_timer_interrupt(int irq, void *dev_id)
-{
-	struct clock_event_device *evdev = dev_id;
-
-	writel(1 << 1, mtu_base + MTU_ICR); /* Interrupt clear reg */
-	evdev->event_handler(evdev);
-	return IRQ_HANDLED;
-}
-
-static struct irqaction nmdk_timer_irq = {
-	.name		= "Nomadik Timer Tick",
-	.flags		= IRQF_DISABLED | IRQF_TIMER,
-	.handler	= nmdk_timer_interrupt,
-	.dev_id		= &nmdk_clkevt,
-};
-
-void nmdk_clksrc_reset(void)
-{
-	/* Disable */
-	writel(0, mtu_base + MTU_CR(0));
-
-	/* ClockSource: configure load and background-load, and fire it up */
-	writel(nmdk_cycle, mtu_base + MTU_LR(0));
-	writel(nmdk_cycle, mtu_base + MTU_BGLR(0));
-
-	writel(clk_prescale | MTU_CRn_32BITS | MTU_CRn_ENA,
-	       mtu_base + MTU_CR(0));
-}
-
-void __init nmdk_timer_init(void __iomem *base, int irq)
-{
-	unsigned long rate;
-	struct clk *clk0;
-
-	mtu_base = base;
-	clk0 = clk_get_sys("mtu0", NULL);
-	BUG_ON(IS_ERR(clk0));
-	BUG_ON(clk_prepare(clk0) < 0);
-	BUG_ON(clk_enable(clk0) < 0);
-
-	/*
-	 * Tick rate is 2.4MHz for Nomadik and 2.4Mhz, 100MHz or 133 MHz
-	 * for ux500.
-	 * Use a divide-by-16 counter if the tick rate is more than 32MHz.
-	 * At 32 MHz, the timer (with 32 bit counter) can be programmed
-	 * to wake-up at a max 127s a head in time. Dividing a 2.4 MHz timer
-	 * with 16 gives too low timer resolution.
-	 */
-	rate = clk_get_rate(clk0);
-	if (rate > 32000000) {
-		rate /= 16;
-		clk_prescale = MTU_CRn_PRESCALE_16;
-	} else {
-		clk_prescale = MTU_CRn_PRESCALE_1;
-	}
-
-	/* Cycles for periodic mode */
-	nmdk_cycle = DIV_ROUND_CLOSEST(rate, HZ);
-
-
-	/* Timer 0 is the free running clocksource */
-	nmdk_clksrc_reset();
-
-	if (clocksource_mmio_init(mtu_base + MTU_VAL(0), "mtu_0",
-			rate, 200, 32, clocksource_mmio_readl_down))
-		pr_err("timer: failed to initialize clock source %s\n",
-		       "mtu_0");
-
-#ifdef CONFIG_NOMADIK_MTU_SCHED_CLOCK
-	setup_sched_clock(nomadik_read_sched_clock, 32, rate);
-#endif
-
-	/* Timer 1 is used for events, register irq and clockevents */
-	setup_irq(irq, &nmdk_timer_irq);
-	nmdk_clkevt.cpumask = cpumask_of(0);
-	clockevents_config_and_register(&nmdk_clkevt, rate, 2, 0xffffffffU);
-}