ARM: 5786/1: Introduce plat-nomadik, MTU code re-organization

Introduce the plat-nomadik folder for ST-Ericsson
machines including the existing nomadik 8815 architecture.
This also moves the existing MTU (MultiTimerUnit)
of nomadik 8815 to the proposed plat-nomadik and adds
HAS_MTU. The patch has been re-based to 2.6.32-rc6

Signed-off-by: srinidhi kasagar <srinidhi.kasagar@stericsson.com>
Acked-by: Alessandro Rubini <rubini@unipv.it>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

6 files changed, 30 insertions, 212 deletions

diff --git a/arch/arm/mach-nomadik/Kconfig b/arch/arm/mach-nomadik/Kconfig
index 2a02b49c40f0..3c5e0f522e9c 100644
--- a/arch/arm/mach-nomadik/Kconfig
+++ b/arch/arm/mach-nomadik/Kconfig
@@ -5,13 +5,13 @@ menu "Nomadik boards"
 config MACH_NOMADIK_8815NHK
         bool "ST 8815 Nomadik Hardware Kit (evaluation board)"
         select NOMADIK_8815
+        select HAS_MTU
 
 endmenu
 
 config NOMADIK_8815
         bool
 
-
 config I2C_BITBANG_8815NHK
         tristate "Driver for bit-bang busses found on the 8815 NHK"
         depends on I2C && MACH_NOMADIK_8815NHK
diff --git a/arch/arm/mach-nomadik/Makefile b/arch/arm/mach-nomadik/Makefile
index 412040982a40..36f67fb207d2 100644
--- a/arch/arm/mach-nomadik/Makefile
+++ b/arch/arm/mach-nomadik/Makefile
@@ -7,7 +7,7 @@
 
 # Object file lists.
 
-obj-y                   += clock.o timer.o gpio.o
+obj-y                   += clock.o gpio.o
 
 # Cpu revision
 obj-$(CONFIG_NOMADIK_8815) += cpu-8815.o
diff --git a/arch/arm/mach-nomadik/board-nhk8815.c b/arch/arm/mach-nomadik/board-nhk8815.c
index 6bfd537d5afb..116394484e71 100644
--- a/arch/arm/mach-nomadik/board-nhk8815.c
+++ b/arch/arm/mach-nomadik/board-nhk8815.c
@@ -25,11 +25,18 @@
 #include <asm/mach/arch.h>
 #include <asm/mach/irq.h>
 #include <asm/mach/flash.h>
+
+#include <plat/mtu.h>
+
 #include <mach/setup.h>
 #include <mach/nand.h>
 #include <mach/fsmc.h>
 #include "clock.h"
 
+/* Initial value for SRC control register: all timers use MXTAL/8 source */
+#define SRC_CR_INIT_MASK        0x00007fff
+#define SRC_CR_INIT_VAL         0x2aaa8000
+
 /* These adresses span 16MB, so use three individual pages */
 static struct resource nhk8815_nand_resources[] = {
         {
@@ -239,6 +246,26 @@ static struct platform_device *nhk8815_platform_devices[] __initdata = {
         /* will add more devices */
 };
 
+static void __init nomadik_timer_init(void)
+{
+        u32 src_cr;
+
+        /* Configure timer sources in "system reset controller" ctrl reg */
+        src_cr = readl(io_p2v(NOMADIK_SRC_BASE));
+        src_cr &= SRC_CR_INIT_MASK;
+        src_cr |= SRC_CR_INIT_VAL;
+        writel(src_cr, io_p2v(NOMADIK_SRC_BASE));
+
+        /* Save global pointer to mtu, used by platform timer code */
+        mtu_base = io_p2v(NOMADIK_MTU0_BASE);
+
+        nmdk_timer_init();
+}
+
+static struct sys_timer nomadik_timer = {
+        .init   = nomadik_timer_init,
+};
+
 static void __init nhk8815_platform_init(void)
 {
         int i;
diff --git a/arch/arm/mach-nomadik/include/mach/mtu.h b/arch/arm/mach-nomadik/include/mach/mtu.h
deleted file mode 100644
index 76da7f085330..000000000000
--- a/arch/arm/mach-nomadik/include/mach/mtu.h
+++ /dev/null
@@ -1,45 +0,0 @@
-#ifndef __ASM_ARCH_MTU_H
-#define __ASM_ARCH_MTU_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
-
-#endif /* __ASM_ARCH_MTU_H */
-
diff --git a/arch/arm/mach-nomadik/include/mach/setup.h b/arch/arm/mach-nomadik/include/mach/setup.h
index a4e468cf63da..b7897edf1f35 100644
--- a/arch/arm/mach-nomadik/include/mach/setup.h
+++ b/arch/arm/mach-nomadik/include/mach/setup.h
@@ -15,7 +15,7 @@
 extern void cpu8815_map_io(void);
 extern void cpu8815_platform_init(void);
 extern void cpu8815_init_irq(void);
-extern struct sys_timer nomadik_timer;
+extern void nmdk_timer_init(void);
 
 #endif /* NOMADIK_8815 */
 
diff --git a/arch/arm/mach-nomadik/timer.c b/arch/arm/mach-nomadik/timer.c
deleted file mode 100644
index d1738e7061d4..000000000000
--- a/arch/arm/mach-nomadik/timer.c
+++ /dev/null
@@ -1,164 +0,0 @@
-/*
- *  linux/arch/arm/mach-nomadik/timer.c
- *
- * Copyright (C) 2008 STMicroelectronics
- * Copyright (C) 2009 Alessandro Rubini, somewhat based on at91sam926x
- *
- * 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/jiffies.h>
-#include <asm/mach/time.h>
-#include <mach/mtu.h>
-
-#define TIMER_CTRL      0x80    /* No divisor */
-#define TIMER_PERIODIC  0x40
-#define TIMER_SZ32BIT   0x02
-
-/* Initial value for SRC control register: all timers use MXTAL/8 source */
-#define SRC_CR_INIT_MASK        0x00007fff
-#define SRC_CR_INIT_VAL         0x2aaa8000
-
-static u32      nmdk_count;             /* accumulated count */
-static u32      nmdk_cycle;             /* write-once */
-static __iomem void *mtu_base;
-
-/*
- * clocksource: the MTU device is a decrementing counters, so we negate
- * the value being read.
- */
-static cycle_t nmdk_read_timer(struct clocksource *cs)
-{
-        u32 count = readl(mtu_base + MTU_VAL(0));
-        return nmdk_count + nmdk_cycle - count;
-
-}
-
-static struct clocksource nmdk_clksrc = {
-        .name           = "mtu_0",
-        .rating         = 120,
-        .read           = nmdk_read_timer,
-        .shift          = 20,
-        .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
-};
-
-/*
- * Clockevent device: currently only periodic mode is supported
- */
-static void nmdk_clkevt_mode(enum clock_event_mode mode,
-                             struct clock_event_device *dev)
-{
-        unsigned long flags;
-
-        switch (mode) {
-        case CLOCK_EVT_MODE_PERIODIC:
-                /* enable interrupts -- and count current value? */
-                raw_local_irq_save(flags);
-                writel(readl(mtu_base + MTU_IMSC) | 1, mtu_base + MTU_IMSC);
-                raw_local_irq_restore(flags);
-                break;
-        case CLOCK_EVT_MODE_ONESHOT:
-                BUG(); /* Not supported, yet */
-                /* FALLTHROUGH */
-        case CLOCK_EVT_MODE_SHUTDOWN:
-        case CLOCK_EVT_MODE_UNUSED:
-                /* disable irq */
-                raw_local_irq_save(flags);
-                writel(readl(mtu_base + MTU_IMSC) & ~1, mtu_base + MTU_IMSC);
-                raw_local_irq_restore(flags);
-                break;
-        case CLOCK_EVT_MODE_RESUME:
-                break;
-        }
-}
-
-static struct clock_event_device nmdk_clkevt = {
-        .name           = "mtu_0",
-        .features       = CLOCK_EVT_FEAT_PERIODIC,
-        .shift          = 32,
-        .rating         = 100,
-        .set_mode       = nmdk_clkevt_mode,
-};
-
-/*
- * IRQ Handler for the timer 0 of the MTU block. The irq is not shared
- * as we are the only users of mtu0 by now.
- */
-static irqreturn_t nmdk_timer_interrupt(int irq, void *dev_id)
-{
-        /* ack: "interrupt clear register" */
-        writel( 1 << 0, mtu_base + MTU_ICR);
-
-        /* we can't count lost ticks, unfortunately */
-        nmdk_count += nmdk_cycle;
-        nmdk_clkevt.event_handler(&nmdk_clkevt);
-
-        return IRQ_HANDLED;
-}
-
-/*
- * Set up timer interrupt, and return the current time in seconds.
- */
-static struct irqaction nmdk_timer_irq = {
-        .name           = "Nomadik Timer Tick",
-        .flags          = IRQF_DISABLED | IRQF_TIMER,
-        .handler        = nmdk_timer_interrupt,
-};
-
-static void nmdk_timer_reset(void)
-{
-        u32 cr;
-
-        writel(0, mtu_base + MTU_CR(0)); /* off */
-
-        /* 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));
-        cr = MTU_CRn_PERIODIC | MTU_CRn_PRESCALE_1 | MTU_CRn_32BITS;
-        writel(cr, mtu_base + MTU_CR(0));
-        writel(cr | MTU_CRn_ENA, mtu_base + MTU_CR(0));
-}
-
-static void __init nmdk_timer_init(void)
-{
-        u32 src_cr;
-        unsigned long rate;
-        int bits;
-
-        rate = CLOCK_TICK_RATE; /* 2.4MHz */
-        nmdk_cycle = (rate + HZ/2) / HZ;
-
-        /* Configure timer sources in "system reset controller" ctrl reg */
-        src_cr = readl(io_p2v(NOMADIK_SRC_BASE));
-        src_cr &= SRC_CR_INIT_MASK;
-        src_cr |= SRC_CR_INIT_VAL;
-        writel(src_cr, io_p2v(NOMADIK_SRC_BASE));
-
-        /* Save global pointer to mtu, used by functions above */
-        mtu_base = io_p2v(NOMADIK_MTU0_BASE);
-
-        /* Init the timer and register clocksource */
-        nmdk_timer_reset();
-
-        nmdk_clksrc.mult = clocksource_hz2mult(rate, nmdk_clksrc.shift);
-        bits =  8*sizeof(nmdk_count);
-        nmdk_clksrc.mask = CLOCKSOURCE_MASK(bits);
-
-        clocksource_register(&nmdk_clksrc);
-
-        /* Register irq and clockevents */
-        setup_irq(IRQ_MTU0, &nmdk_timer_irq);
-        nmdk_clkevt.mult = div_sc(rate, NSEC_PER_SEC, nmdk_clkevt.shift);
-        nmdk_clkevt.cpumask = cpumask_of(0);
-        clockevents_register_device(&nmdk_clkevt);
-}
-
-struct sys_timer nomadik_timer = {
-        .init           = nmdk_timer_init,
-};