From 59b559d7a39b590aecef583af58d123ff5876570 Mon Sep 17 00:00:00 2001 From: Srinidhi Kasagar Date: Thu, 12 Nov 2009 06:20:54 +0100 Subject: 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 Acked-by: Alessandro Rubini Signed-off-by: Russell King --- arch/arm/Kconfig | 1 + arch/arm/Makefile | 1 + arch/arm/mach-nomadik/Kconfig | 2 +- arch/arm/mach-nomadik/Makefile | 2 +- arch/arm/mach-nomadik/board-nhk8815.c | 27 +++++ arch/arm/mach-nomadik/include/mach/mtu.h | 45 -------- arch/arm/mach-nomadik/include/mach/setup.h | 2 +- arch/arm/mach-nomadik/timer.c | 164 ----------------------------- arch/arm/plat-nomadik/Kconfig | 22 ++++ arch/arm/plat-nomadik/Makefile | 5 + arch/arm/plat-nomadik/include/plat/mtu.h | 48 +++++++++ arch/arm/plat-nomadik/timer.c | 147 ++++++++++++++++++++++++++ 12 files changed, 254 insertions(+), 212 deletions(-) delete mode 100644 arch/arm/mach-nomadik/include/mach/mtu.h delete mode 100644 arch/arm/mach-nomadik/timer.c create mode 100644 arch/arm/plat-nomadik/Kconfig create mode 100644 arch/arm/plat-nomadik/Makefile create mode 100644 arch/arm/plat-nomadik/include/plat/mtu.h create mode 100644 arch/arm/plat-nomadik/timer.c (limited to 'arch') diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 1c4119c60040..76cd466ad48c 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -787,6 +787,7 @@ source "arch/arm/mach-at91/Kconfig" source "arch/arm/plat-mxc/Kconfig" source "arch/arm/mach-nomadik/Kconfig" +source "arch/arm/plat-nomadik/Kconfig" source "arch/arm/mach-netx/Kconfig" diff --git a/arch/arm/Makefile b/arch/arm/Makefile index a73caaf66763..1bee36fa5fb1 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -176,6 +176,7 @@ machine-$(CONFIG_ARCH_MXC91231) := mxc91231 plat-$(CONFIG_ARCH_MXC) := mxc plat-$(CONFIG_ARCH_OMAP) := omap plat-$(CONFIG_PLAT_IOP) := iop +plat-$(CONFIG_PLAT_NOMADIK) := nomadik plat-$(CONFIG_PLAT_ORION) := orion plat-$(CONFIG_PLAT_PXA) := pxa plat-$(CONFIG_PLAT_S3C24XX) := s3c24xx s3c 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 #include #include + +#include + #include #include #include #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 -#include -#include -#include -#include -#include -#include -#include - -#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, -}; diff --git a/arch/arm/plat-nomadik/Kconfig b/arch/arm/plat-nomadik/Kconfig new file mode 100644 index 000000000000..e27ee3134056 --- /dev/null +++ b/arch/arm/plat-nomadik/Kconfig @@ -0,0 +1,22 @@ +# 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 + default y + 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. + +endif diff --git a/arch/arm/plat-nomadik/Makefile b/arch/arm/plat-nomadik/Makefile new file mode 100644 index 000000000000..37c7cdd0f8f0 --- /dev/null +++ b/arch/arm/plat-nomadik/Makefile @@ -0,0 +1,5 @@ +# 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 new file mode 100644 index 000000000000..42c907258b14 --- /dev/null +++ b/arch/arm/plat-nomadik/include/plat/mtu.h @@ -0,0 +1,48 @@ +#ifndef __PLAT_MTU_H +#define __PLAT_MTU_H + +/* should be set by the platform code */ +extern void __iomem *mtu_base; + +/* + * 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 /* __PLAT_MTU_H */ + diff --git a/arch/arm/plat-nomadik/timer.c b/arch/arm/plat-nomadik/timer.c new file mode 100644 index 000000000000..62f18ad43a28 --- /dev/null +++ b/arch/arm/plat-nomadik/timer.c @@ -0,0 +1,147 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include + +#include + +static u32 nmdk_count; /* accumulated count */ +static u32 nmdk_cycle; /* write-once */ + +/* setup by the platform code */ +void __iomem *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)); +} + +void __init nmdk_timer_init(void) +{ + unsigned long rate; + int bits; + + rate = CLOCK_TICK_RATE; /* 2.4MHz */ + nmdk_cycle = (rate + HZ/2) / HZ; + + /* 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); + + if (clocksource_register(&nmdk_clksrc)) + printk(KERN_ERR "timer: failed to initialize clock " + "source %s\n", nmdk_clksrc.name); + + /* 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); +} -- cgit v1.2.3