From 8b526ae4ddd7a62397d99856079b59eda5d09360 Mon Sep 17 00:00:00 2001
From: Jongpill Lee <boyko.lee@samsung.com>
Date: Fri, 16 Jul 2010 10:19:41 +0900
Subject: ARM: SAMSUNG: serial: Add FRACVAL support for newer UART

Add support for the FRACVAL register on the newer UART blocks which provides
the same function as UDIVSLOT register but the FRACVAL is easier to implement.
To support UDIVSLOT register, UDIVSLOT table search is necessary though
supporting FRACVAL only needs the index value of UDIVSLOT table.

Signed-off-by: Jongpill Lee <boyko.lee@samsung.com>
Acked-by: Changhwan Youn <chaos.youn@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
---
 arch/arm/plat-samsung/include/plat/regs-serial.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'arch/arm/plat-samsung')

diff --git a/arch/arm/plat-samsung/include/plat/regs-serial.h b/arch/arm/plat-samsung/include/plat/regs-serial.h
index a6eba8496b24..788837e99cb3 100644
--- a/arch/arm/plat-samsung/include/plat/regs-serial.h
+++ b/arch/arm/plat-samsung/include/plat/regs-serial.h
@@ -259,6 +259,8 @@ struct s3c2410_uartcfg {
 	unsigned short	   flags;
 	upf_t		   uart_flags;	 /* default uart flags */
 
+	unsigned int	   has_fracval;
+
 	unsigned long	   ucon;	 /* value of ucon for port */
 	unsigned long	   ulcon;	 /* value of ulcon for port */
 	unsigned long	   ufcon;	 /* value of ufcon for port */
-- 
cgit v1.2.3


From cfca3a619baeaba3a0037fef5da48108e9c0bb1c Mon Sep 17 00:00:00 2001
From: Changhwan Youn <chaos.youn@samsung.com>
Date: Mon, 26 Jul 2010 21:13:08 +0900
Subject: ARM: S5PV310: Add Timer support

This patch adds timer support for S5PV310.  Until now, all S5P SoCs
use CONFIG_ARCH_USES_GETTIMEOFFSET macro as a default configuration.
Instead,S5PV310 implements clocksource and clock_event_device to
support the high resolution timer and tickless system.

Signed-off-by: Changhwan Youn <chaos.youn@samsung.com>
Signed-off-by: Hyuk Lee <hyuk1.lee@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
---
 arch/arm/mach-s5pv310/include/mach/pwm-clock.h |  70 ++++++
 arch/arm/mach-s5pv310/localtimer.c             |  25 +++
 arch/arm/mach-s5pv310/time.c                   | 287 +++++++++++++++++++++++++
 arch/arm/plat-s5p/include/plat/s5pv310.h       |   1 +
 arch/arm/plat-samsung/Makefile                 |   2 +-
 5 files changed, 384 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/mach-s5pv310/include/mach/pwm-clock.h
 create mode 100644 arch/arm/mach-s5pv310/localtimer.c
 create mode 100644 arch/arm/mach-s5pv310/time.c

(limited to 'arch/arm/plat-samsung')

diff --git a/arch/arm/mach-s5pv310/include/mach/pwm-clock.h b/arch/arm/mach-s5pv310/include/mach/pwm-clock.h
new file mode 100644
index 000000000000..7e6da2701088
--- /dev/null
+++ b/arch/arm/mach-s5pv310/include/mach/pwm-clock.h
@@ -0,0 +1,70 @@
+/* linux/arch/arm/mach-s5pv310/include/mach/pwm-clock.h
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com/
+ *
+ * Copyright 2008 Openmoko, Inc.
+ * Copyright 2008 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *      http://armlinux.simtec.co.uk/
+ *
+ * Based on arch/arm/mach-s3c64xx/include/mach/pwm-clock.h
+ *
+ * S5PV310 - pwm clock and timer support
+ *
+ * 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.
+*/
+
+#ifndef __ASM_ARCH_PWMCLK_H
+#define __ASM_ARCH_PWMCLK_H __FILE__
+
+/**
+ * pwm_cfg_src_is_tclk() - return whether the given mux config is a tclk
+ * @tcfg: The timer TCFG1 register bits shifted down to 0.
+ *
+ * Return true if the given configuration from TCFG1 is a TCLK instead
+ * any of the TDIV clocks.
+ */
+static inline int pwm_cfg_src_is_tclk(unsigned long tcfg)
+{
+	return tcfg == S3C64XX_TCFG1_MUX_TCLK;
+}
+
+/**
+ * tcfg_to_divisor() - convert tcfg1 setting to a divisor
+ * @tcfg1: The tcfg1 setting, shifted down.
+ *
+ * Get the divisor value for the given tcfg1 setting. We assume the
+ * caller has already checked to see if this is not a TCLK source.
+ */
+static inline unsigned long tcfg_to_divisor(unsigned long tcfg1)
+{
+	return 1 << tcfg1;
+}
+
+/**
+ * pwm_tdiv_has_div1() - does the tdiv setting have a /1
+ *
+ * Return true if we have a /1 in the tdiv setting.
+ */
+static inline unsigned int pwm_tdiv_has_div1(void)
+{
+	return 1;
+}
+
+/**
+ * pwm_tdiv_div_bits() - calculate TCFG1 divisor value.
+ * @div: The divisor to calculate the bit information for.
+ *
+ * Turn a divisor into the necessary bit field for TCFG1.
+ */
+static inline unsigned long pwm_tdiv_div_bits(unsigned int div)
+{
+	return ilog2(div);
+}
+
+#define S3C_TCFG1_MUX_TCLK S3C64XX_TCFG1_MUX_TCLK
+
+#endif /* __ASM_ARCH_PWMCLK_H */
diff --git a/arch/arm/mach-s5pv310/localtimer.c b/arch/arm/mach-s5pv310/localtimer.c
new file mode 100644
index 000000000000..2784036cd8b1
--- /dev/null
+++ b/arch/arm/mach-s5pv310/localtimer.c
@@ -0,0 +1,25 @@
+/* linux/arch/arm/mach-s5pv310/localtimer.c
+ *
+ * Cloned from linux/arch/arm/mach-realview/localtimer.c
+ *
+ *  Copyright (C) 2002 ARM Ltd.
+ *  All Rights Reserved
+ *
+ * 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/clockchips.h>
+
+#include <asm/irq.h>
+#include <asm/localtimer.h>
+
+/*
+ * Setup the local clock events for a CPU.
+ */
+void __cpuinit local_timer_setup(struct clock_event_device *evt)
+{
+	evt->irq = IRQ_LOCALTIMER;
+	twd_timer_setup(evt);
+}
diff --git a/arch/arm/mach-s5pv310/time.c b/arch/arm/mach-s5pv310/time.c
new file mode 100644
index 000000000000..01b012ad1bfd
--- /dev/null
+++ b/arch/arm/mach-s5pv310/time.c
@@ -0,0 +1,287 @@
+/* linux/arch/arm/mach-s5pv310/time.c
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * S5PV310 (and compatible) HRT support
+ * PWM 2/4 is used for this feature
+ *
+ * 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/sched.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/clockchips.h>
+#include <linux/platform_device.h>
+
+#include <asm/smp_twd.h>
+
+#include <mach/map.h>
+#include <plat/regs-timer.h>
+#include <asm/mach/time.h>
+
+static unsigned long clock_count_per_tick;
+
+static struct clk *tin2;
+static struct clk *tin4;
+static struct clk *tdiv2;
+static struct clk *tdiv4;
+static struct clk *timerclk;
+
+static void s5pv310_pwm_stop(unsigned int pwm_id)
+{
+	unsigned long tcon;
+
+	tcon = __raw_readl(S3C2410_TCON);
+
+	switch (pwm_id) {
+	case 2:
+		tcon &= ~S3C2410_TCON_T2START;
+		break;
+	case 4:
+		tcon &= ~S3C2410_TCON_T4START;
+		break;
+	default:
+		break;
+	}
+	__raw_writel(tcon, S3C2410_TCON);
+}
+
+static void s5pv310_pwm_init(unsigned int pwm_id, unsigned long tcnt)
+{
+	unsigned long tcon;
+
+	tcon = __raw_readl(S3C2410_TCON);
+
+	/* timers reload after counting zero, so reduce the count by 1 */
+	tcnt--;
+
+	/* ensure timer is stopped... */
+	switch (pwm_id) {
+	case 2:
+		tcon &= ~(0xf<<12);
+		tcon |= S3C2410_TCON_T2MANUALUPD;
+
+		__raw_writel(tcnt, S3C2410_TCNTB(2));
+		__raw_writel(tcnt, S3C2410_TCMPB(2));
+		__raw_writel(tcon, S3C2410_TCON);
+
+		break;
+	case 4:
+		tcon &= ~(7<<20);
+		tcon |= S3C2410_TCON_T4MANUALUPD;
+
+		__raw_writel(tcnt, S3C2410_TCNTB(4));
+		__raw_writel(tcnt, S3C2410_TCMPB(4));
+		__raw_writel(tcon, S3C2410_TCON);
+
+		break;
+	default:
+		break;
+	}
+}
+
+static inline void s5pv310_pwm_start(unsigned int pwm_id, bool periodic)
+{
+	unsigned long tcon;
+
+	tcon  = __raw_readl(S3C2410_TCON);
+
+	switch (pwm_id) {
+	case 2:
+		tcon |= S3C2410_TCON_T2START;
+		tcon &= ~S3C2410_TCON_T2MANUALUPD;
+
+		if (periodic)
+			tcon |= S3C2410_TCON_T2RELOAD;
+		else
+			tcon &= ~S3C2410_TCON_T2RELOAD;
+		break;
+	case 4:
+		tcon |= S3C2410_TCON_T4START;
+		tcon &= ~S3C2410_TCON_T4MANUALUPD;
+
+		if (periodic)
+			tcon |= S3C2410_TCON_T4RELOAD;
+		else
+			tcon &= ~S3C2410_TCON_T4RELOAD;
+		break;
+	default:
+		break;
+	}
+	__raw_writel(tcon, S3C2410_TCON);
+}
+
+static int s5pv310_pwm_set_next_event(unsigned long cycles,
+					struct clock_event_device *evt)
+{
+	s5pv310_pwm_init(2, cycles);
+	s5pv310_pwm_start(2, 0);
+	return 0;
+}
+
+static void s5pv310_pwm_set_mode(enum clock_event_mode mode,
+				struct clock_event_device *evt)
+{
+	s5pv310_pwm_stop(2);
+
+	switch (mode) {
+	case CLOCK_EVT_MODE_PERIODIC:
+		s5pv310_pwm_init(2, clock_count_per_tick);
+		s5pv310_pwm_start(2, 1);
+		break;
+	case CLOCK_EVT_MODE_ONESHOT:
+		break;
+	case CLOCK_EVT_MODE_UNUSED:
+	case CLOCK_EVT_MODE_SHUTDOWN:
+	case CLOCK_EVT_MODE_RESUME:
+		break;
+	}
+}
+
+static struct clock_event_device pwm_event_device = {
+	.name		= "pwm_timer2",
+	.features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+	.rating		= 200,
+	.shift		= 32,
+	.set_next_event	= s5pv310_pwm_set_next_event,
+	.set_mode	= s5pv310_pwm_set_mode,
+};
+
+irqreturn_t s5pv310_clock_event_isr(int irq, void *dev_id)
+{
+	struct clock_event_device *evt = &pwm_event_device;
+
+	evt->event_handler(evt);
+
+	return IRQ_HANDLED;
+}
+
+static struct irqaction s5pv310_clock_event_irq = {
+	.name		= "pwm_timer2_irq",
+	.flags		= IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
+	.handler	= s5pv310_clock_event_isr,
+};
+
+static void __init s5pv310_clockevent_init(void)
+{
+	unsigned long pclk;
+	unsigned long clock_rate;
+	struct clk *tscaler;
+
+	pclk = clk_get_rate(timerclk);
+
+	/* configure clock tick */
+
+	tscaler = clk_get_parent(tdiv2);
+
+	clk_set_rate(tscaler, pclk / 2);
+	clk_set_rate(tdiv2, pclk / 2);
+	clk_set_parent(tin2, tdiv2);
+
+	clock_rate = clk_get_rate(tin2);
+
+	clock_count_per_tick = clock_rate / HZ;
+
+	pwm_event_device.mult =
+		div_sc(clock_rate, NSEC_PER_SEC, pwm_event_device.shift);
+	pwm_event_device.max_delta_ns =
+		clockevent_delta2ns(-1, &pwm_event_device);
+	pwm_event_device.min_delta_ns =
+		clockevent_delta2ns(1, &pwm_event_device);
+
+	pwm_event_device.cpumask = cpumask_of(0);
+	clockevents_register_device(&pwm_event_device);
+
+	setup_irq(IRQ_TIMER2, &s5pv310_clock_event_irq);
+}
+
+static cycle_t s5pv310_pwm4_read(struct clocksource *cs)
+{
+	return (cycle_t) ~__raw_readl(S3C_TIMERREG(0x40));
+}
+
+struct clocksource pwm_clocksource = {
+	.name		= "pwm_timer4",
+	.rating		= 250,
+	.read		= s5pv310_pwm4_read,
+	.mask		= CLOCKSOURCE_MASK(32),
+	.shift		= 20,
+	.flags		= CLOCK_SOURCE_IS_CONTINUOUS ,
+};
+
+static void __init s5pv310_clocksource_init(void)
+{
+	unsigned long pclk;
+	unsigned long clock_rate;
+
+	pclk = clk_get_rate(timerclk);
+
+	clk_set_rate(tdiv4, pclk / 2);
+	clk_set_parent(tin4, tdiv4);
+
+	clock_rate = clk_get_rate(tin4);
+
+	s5pv310_pwm_init(4, ~0);
+	s5pv310_pwm_start(4, 1);
+
+	pwm_clocksource.mult =
+		clocksource_khz2mult(clock_rate/1000, pwm_clocksource.shift);
+
+	if (clocksource_register(&pwm_clocksource))
+		panic("%s: can't register clocksource\n", pwm_clocksource.name);
+}
+
+static void __init s5pv310_timer_resources(void)
+{
+	struct platform_device tmpdev;
+
+	tmpdev.dev.bus = &platform_bus_type;
+
+	timerclk = clk_get(NULL, "timers");
+	if (IS_ERR(timerclk))
+		panic("failed to get timers clock for system timer");
+
+	clk_enable(timerclk);
+
+	tmpdev.id = 2;
+	tin2 = clk_get(&tmpdev.dev, "pwm-tin");
+	if (IS_ERR(tin2))
+		panic("failed to get pwm-tin2 clock for system timer");
+
+	tdiv2 = clk_get(&tmpdev.dev, "pwm-tdiv");
+	if (IS_ERR(tdiv2))
+		panic("failed to get pwm-tdiv2 clock for system timer");
+	clk_enable(tin2);
+
+	tmpdev.id = 4;
+	tin4 = clk_get(&tmpdev.dev, "pwm-tin");
+	if (IS_ERR(tin4))
+		panic("failed to get pwm-tin4 clock for system timer");
+
+	tdiv4 = clk_get(&tmpdev.dev, "pwm-tdiv");
+	if (IS_ERR(tdiv4))
+		panic("failed to get pwm-tdiv4 clock for system timer");
+
+	clk_enable(tin4);
+}
+
+static void __init s5pv310_timer_init(void)
+{
+#ifdef CONFIG_LOCAL_TIMERS
+	twd_base = S5P_VA_TWD;
+#endif
+
+	s5pv310_timer_resources();
+	s5pv310_clockevent_init();
+	s5pv310_clocksource_init();
+}
+
+struct sys_timer s5pv310_timer = {
+	.init		= s5pv310_timer_init,
+};
diff --git a/arch/arm/plat-s5p/include/plat/s5pv310.h b/arch/arm/plat-s5p/include/plat/s5pv310.h
index d2f05e1cad9d..769c991ceb37 100644
--- a/arch/arm/plat-s5p/include/plat/s5pv310.h
+++ b/arch/arm/plat-s5p/include/plat/s5pv310.h
@@ -22,6 +22,7 @@ extern  int s5pv310_init(void);
 extern void s5pv310_init_irq(void);
 extern void s5pv310_map_io(void);
 extern void s5pv310_init_clocks(int xtal);
+extern struct sys_timer s5pv310_timer;
 
 #define s5pv310_init_uarts s5pv310_common_init_uarts
 
diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile
index b1d82cc5e716..0d5bf8a20a63 100644
--- a/arch/arm/plat-samsung/Makefile
+++ b/arch/arm/plat-samsung/Makefile
@@ -12,7 +12,7 @@ obj-				:=
 # Objects we always build independent of SoC choice
 
 obj-y				+= init.o
-obj-y				+= time.o
+obj-$(CONFIG_ARCH_USES_GETTIMEOFFSET)   += time.o
 obj-y				+= clock.o
 obj-y				+= pwm-clock.o
 obj-y				+= gpio.o
-- 
cgit v1.2.3