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-rw-r--r--target/linux/s3c24xx/patches-2.6.30/070-s3c24xx-time.patch483
1 files changed, 0 insertions, 483 deletions
diff --git a/target/linux/s3c24xx/patches-2.6.30/070-s3c24xx-time.patch b/target/linux/s3c24xx/patches-2.6.30/070-s3c24xx-time.patch
deleted file mode 100644
index 8b85045..0000000
--- a/target/linux/s3c24xx/patches-2.6.30/070-s3c24xx-time.patch
+++ /dev/null
@@ -1,483 +0,0 @@
---- /dev/null
-+++ b/arch/arm/plat-s3c24xx/time.c
-@@ -0,0 +1,480 @@
-+/* linux/arch/arm/plat-s3c24xx/time.c
-+ *
-+ * Copyright (C) 2003-2005 Simtec Electronics
-+ * Ben Dooks, <ben@simtec.co.uk>
-+ *
-+ * dyn_tick support by Andrzej Zaborowski based on omap_dyn_tick_timer.
-+ *
-+ * This program is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program; if not, write to the Free Software
-+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-+ */
-+
-+#include <linux/kernel.h>
-+#include <linux/sched.h>
-+#include <linux/init.h>
-+#include <linux/interrupt.h>
-+#include <linux/irq.h>
-+#include <linux/err.h>
-+#include <linux/clk.h>
-+
-+#include <asm/system.h>
-+#include <asm/leds.h>
-+#include <asm/mach-types.h>
-+
-+#include <asm/io.h>
-+#include <asm/irq.h>
-+#include <mach/map.h>
-+#include <asm/plat-s3c/regs-timer.h>
-+#include <mach/regs-irq.h>
-+#include <asm/mach/time.h>
-+
-+#include <asm/plat-s3c24xx/clock.h>
-+#include <asm/plat-s3c24xx/cpu.h>
-+
-+static unsigned long timer_startval;
-+static unsigned long timer_usec_ticks;
-+static struct work_struct resume_work;
-+
-+unsigned long pclk;
-+struct clk *clk;
-+
-+#define TIMER_USEC_SHIFT 16
-+
-+/* we use the shifted arithmetic to work out the ratio of timer ticks
-+ * to usecs, as often the peripheral clock is not a nice even multiple
-+ * of 1MHz.
-+ *
-+ * shift of 14 and 15 are too low for the 12MHz, 16 seems to be ok
-+ * for the current HZ value of 200 without producing overflows.
-+ *
-+ * Original patch by Dimitry Andric, updated by Ben Dooks
-+*/
-+
-+
-+/* timer_mask_usec_ticks
-+ *
-+ * given a clock and divisor, make the value to pass into timer_ticks_to_usec
-+ * to scale the ticks into usecs
-+*/
-+
-+static inline unsigned long
-+timer_mask_usec_ticks(unsigned long scaler, unsigned long pclk)
-+{
-+ unsigned long den = pclk / 1000;
-+
-+ return ((1000 << TIMER_USEC_SHIFT) * scaler + (den >> 1)) / den;
-+}
-+
-+/* timer_ticks_to_usec
-+ *
-+ * convert timer ticks to usec.
-+*/
-+
-+static inline unsigned long timer_ticks_to_usec(unsigned long ticks)
-+{
-+ unsigned long res;
-+
-+ res = ticks * timer_usec_ticks;
-+ res += 1 << (TIMER_USEC_SHIFT - 4); /* round up slightly */
-+
-+ return res >> TIMER_USEC_SHIFT;
-+}
-+
-+/***
-+ * Returns microsecond since last clock interrupt. Note that interrupts
-+ * will have been disabled by do_gettimeoffset()
-+ * IRQs are disabled before entering here from do_gettimeofday()
-+ */
-+
-+#define SRCPND_TIMER4 (1<<(IRQ_TIMER4 - IRQ_EINT0))
-+
-+unsigned long s3c2410_gettimeoffset (void)
-+{
-+ unsigned long tdone;
-+ unsigned long irqpend;
-+ unsigned long tval;
-+
-+ /* work out how many ticks have gone since last timer interrupt */
-+
-+ tval = __raw_readl(S3C2410_TCNTO(4));
-+ tdone = timer_startval - tval;
-+
-+ /* check to see if there is an interrupt pending */
-+
-+ irqpend = __raw_readl(S3C2410_SRCPND);
-+ if (irqpend & SRCPND_TIMER4) {
-+ /* re-read the timer, and try and fix up for the missed
-+ * interrupt. Note, the interrupt may go off before the
-+ * timer has re-loaded from wrapping.
-+ */
-+
-+ tval = __raw_readl(S3C2410_TCNTO(4));
-+ tdone = timer_startval - tval;
-+
-+ if (tval != 0)
-+ tdone += timer_startval;
-+ }
-+
-+ return timer_ticks_to_usec(tdone);
-+}
-+
-+
-+/*
-+ * IRQ handler for the timer
-+ */
-+static irqreturn_t
-+s3c2410_timer_interrupt(int irq, void *dev_id)
-+{
-+ timer_tick();
-+ return IRQ_HANDLED;
-+}
-+
-+static struct irqaction s3c2410_timer_irq = {
-+ .name = "S3C2410 Timer Tick",
-+ .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
-+ .handler = s3c2410_timer_interrupt,
-+};
-+
-+#define use_tclk1_12() ( \
-+ machine_is_bast() || \
-+ machine_is_vr1000() || \
-+ machine_is_anubis() || \
-+ machine_is_osiris() )
-+
-+/*
-+ * Set up timer interrupt, and return the current time in seconds.
-+ *
-+ * Currently we only use timer4, as it is the only timer which has no
-+ * other function that can be exploited externally
-+ */
-+static void s3c2410_timer_setup (void)
-+{
-+ unsigned long tcon;
-+ unsigned long tcnt;
-+ unsigned long tcfg1;
-+ unsigned long tcfg0;
-+
-+ tcnt = 0xffff; /* default value for tcnt */
-+
-+ /* read the current timer configuration bits */
-+
-+ tcon = __raw_readl(S3C2410_TCON);
-+ tcfg1 = __raw_readl(S3C2410_TCFG1);
-+ tcfg0 = __raw_readl(S3C2410_TCFG0);
-+
-+ /* configure the system for whichever machine is in use */
-+
-+ if (use_tclk1_12()) {
-+ /* timer is at 12MHz, scaler is 1 */
-+ timer_usec_ticks = timer_mask_usec_ticks(1, 12000000);
-+ tcnt = 12000000 / HZ;
-+
-+ tcfg1 &= ~S3C2410_TCFG1_MUX4_MASK;
-+ tcfg1 |= S3C2410_TCFG1_MUX4_TCLK1;
-+ } else {
-+ /* since values around 50 to
-+ * 70MHz are not values we can directly generate the timer
-+ * value from, we need to pre-scale and divide before using it.
-+ *
-+ * for instance, using 50.7MHz and dividing by 6 gives 8.45MHz
-+ * (8.45 ticks per usec)
-+ */
-+
-+ /* configure clock tick */
-+ timer_usec_ticks = timer_mask_usec_ticks(6, pclk);
-+ printk("timer_usec_ticks = %lu\n", timer_usec_ticks);
-+
-+ tcfg1 &= ~S3C2410_TCFG1_MUX4_MASK;
-+ tcfg1 |= S3C2410_TCFG1_MUX4_DIV2;
-+
-+ tcfg0 &= ~S3C2410_TCFG_PRESCALER1_MASK;
-+ tcfg0 |= ((6 - 1) / 2) << S3C2410_TCFG_PRESCALER1_SHIFT;
-+
-+ tcnt = (pclk / 6) / HZ;
-+ }
-+
-+ /* timers reload after counting zero, so reduce the count by 1 */
-+
-+ tcnt--;
-+
-+ printk("timer tcon=%08lx, tcnt %04lx, tcfg %08lx,%08lx, usec %08lx\n",
-+ tcon, tcnt, tcfg0, tcfg1, timer_usec_ticks);
-+
-+ /* check to see if timer is within 16bit range... */
-+ if (tcnt > 0xffff) {
-+ panic("setup_timer: HZ is too small, cannot configure timer!");
-+ return;
-+ }
-+
-+ __raw_writel(tcfg1, S3C2410_TCFG1);
-+ __raw_writel(tcfg0, S3C2410_TCFG0);
-+
-+ timer_startval = tcnt;
-+ __raw_writel(tcnt, S3C2410_TCNTB(4));
-+
-+ /* ensure timer is stopped... */
-+
-+ tcon &= ~(7<<20);
-+ tcon |= S3C2410_TCON_T4RELOAD;
-+ tcon |= S3C2410_TCON_T4MANUALUPD;
-+
-+ __raw_writel(tcon, S3C2410_TCON);
-+ __raw_writel(tcnt, S3C2410_TCNTB(4));
-+ __raw_writel(tcnt, S3C2410_TCMPB(4));
-+
-+ /* start the timer running */
-+ tcon |= S3C2410_TCON_T4START;
-+ tcon &= ~S3C2410_TCON_T4MANUALUPD;
-+ __raw_writel(tcon, S3C2410_TCON);
-+
-+ __raw_writel(__raw_readl(S3C2410_INTMSK) & (~(1UL << 14)),
-+ S3C2410_INTMSK);
-+
-+}
-+
-+struct sys_timer s3c24xx_timer;
-+static void timer_resume_work(struct work_struct *work)
-+{
-+ clk_enable(clk);
-+
-+#ifdef CONFIG_NO_IDLE_HZ
-+ if (s3c24xx_timer.dyn_tick->state & DYN_TICK_ENABLED)
-+ s3c24xx_timer.dyn_tick->enable();
-+ else
-+#endif
-+ s3c2410_timer_setup();
-+}
-+
-+static void __init s3c2410_timer_init (void)
-+{
-+ if (!use_tclk1_12()) {
-+ /* for the h1940 (and others), we use the pclk from the core
-+ * to generate the timer values.
-+ */
-+
-+ /* this is used as default if no other timer can be found */
-+ clk = clk_get(NULL, "timers");
-+ if (IS_ERR(clk))
-+ panic("failed to get clock for system timer");
-+
-+ clk_enable(clk);
-+
-+ pclk = clk_get_rate(clk);
-+ printk("pclk = %lu\n", pclk);
-+ }
-+
-+ INIT_WORK(&resume_work, timer_resume_work);
-+ s3c2410_timer_setup();
-+ setup_irq(IRQ_TIMER4, &s3c2410_timer_irq);
-+}
-+
-+static void s3c2410_timer_resume_work(struct work_struct *work)
-+{
-+ s3c2410_timer_setup();
-+}
-+
-+static void s3c2410_timer_resume(void)
-+{
-+ static DECLARE_WORK(work, s3c2410_timer_resume_work);
-+ int res;
-+
-+ res = schedule_work(&work);
-+ if (!res)
-+ printk(KERN_ERR
-+ "s3c2410_timer_resume_work already queued ???\n");
-+}
-+
-+#ifdef CONFIG_NO_IDLE_HZ
-+/*
-+ * We'll set a constant prescaler so we don't have to bother setting it
-+ * when reprogramming and so that we avoid costly divisions.
-+ *
-+ * (2 * HZ) << INPUT_FREQ_SHIFT is the desired frequency after prescaler.
-+ * At HZ == 200, HZ * 1024 should work for PCLKs of up to ~53.5 MHz.
-+ */
-+#define INPUT_FREQ_SHIFT 9
-+
-+static int ticks_last;
-+static int ticks_left;
-+static uint32_t tcnto_last;
-+
-+static inline int s3c24xx_timer_read(void)
-+{
-+ uint32_t tcnto = __raw_readl(S3C2410_TCNTO(4));
-+
-+ /*
-+ * WARNING: sometimes we get called before TCNTB has been
-+ * loaded into the counter and TCNTO then returns its previous
-+ * value and kill us, so don't do anything before counter is
-+ * reloaded.
-+ */
-+ if (unlikely(tcnto == tcnto_last))
-+ return ticks_last;
-+
-+ tcnto_last = -1;
-+ return tcnto <<
-+ ((__raw_readl(S3C2410_TCFG1) >> S3C2410_TCFG1_MUX4_SHIFT) & 3);
-+}
-+
-+static inline void s3c24xx_timer_program(int ticks)
-+{
-+ uint32_t tcon = __raw_readl(S3C2410_TCON) & ~(7 << 20);
-+ uint32_t tcfg1 = __raw_readl(S3C2410_TCFG1) & ~S3C2410_TCFG1_MUX4_MASK;
-+
-+ /* Just make sure the timer is stopped. */
-+ __raw_writel(tcon, S3C2410_TCON);
-+
-+ /* TODO: add likely()ies / unlikely()ies */
-+ if (ticks >> 18) {
-+ ticks_last = min(ticks, 0xffff << 3);
-+ ticks_left = ticks - ticks_last;
-+ __raw_writel(tcfg1 | S3C2410_TCFG1_MUX4_DIV16, S3C2410_TCFG1);
-+ __raw_writel(ticks_last >> 3, S3C2410_TCNTB(4));
-+ } else if (ticks >> 17) {
-+ ticks_last = ticks;
-+ ticks_left = 0;
-+ __raw_writel(tcfg1 | S3C2410_TCFG1_MUX4_DIV8, S3C2410_TCFG1);
-+ __raw_writel(ticks_last >> 2, S3C2410_TCNTB(4));
-+ } else if (ticks >> 16) {
-+ ticks_last = ticks;
-+ ticks_left = 0;
-+ __raw_writel(tcfg1 | S3C2410_TCFG1_MUX4_DIV4, S3C2410_TCFG1);
-+ __raw_writel(ticks_last >> 1, S3C2410_TCNTB(4));
-+ } else {
-+ ticks_last = ticks;
-+ ticks_left = 0;
-+ __raw_writel(tcfg1 | S3C2410_TCFG1_MUX4_DIV2, S3C2410_TCFG1);
-+ __raw_writel(ticks_last >> 0, S3C2410_TCNTB(4));
-+ }
-+
-+ tcnto_last = __raw_readl(S3C2410_TCNTO(4));
-+ __raw_writel(tcon | S3C2410_TCON_T4MANUALUPD,
-+ S3C2410_TCON);
-+ __raw_writel(tcon | S3C2410_TCON_T4START,
-+ S3C2410_TCON);
-+}
-+
-+/*
-+ * If we have already waited all the time we were supposed to wait,
-+ * kick the timer, setting the longest allowed timeout value just
-+ * for time-keeping.
-+ */
-+static inline void s3c24xx_timer_program_idle(void)
-+{
-+ s3c24xx_timer_program(0xffff << 3);
-+}
-+
-+static inline void s3c24xx_timer_update(int restart)
-+{
-+ int ticks_cur = s3c24xx_timer_read();
-+ int jiffies_elapsed = (ticks_last - ticks_cur) >> INPUT_FREQ_SHIFT;
-+ int subjiffy = ticks_last - (jiffies_elapsed << INPUT_FREQ_SHIFT);
-+
-+ if (restart) {
-+ if (ticks_left >= (1 << INPUT_FREQ_SHIFT))
-+ s3c24xx_timer_program(ticks_left);
-+ else
-+ s3c24xx_timer_program_idle();
-+ ticks_last += subjiffy;
-+ } else
-+ ticks_last = subjiffy;
-+
-+ while (jiffies_elapsed --)
-+ timer_tick();
-+}
-+
-+/* Called when the timer expires. */
-+static irqreturn_t s3c24xx_timer_handler(int irq, void *dev_id)
-+{
-+ tcnto_last = -1;
-+ s3c24xx_timer_update(1);
-+
-+ return IRQ_HANDLED;
-+}
-+
-+/* Called to update jiffies with time elapsed. */
-+static irqreturn_t s3c24xx_timer_handler_dyn_tick(int irq, void *dev_id)
-+{
-+ s3c24xx_timer_update(0);
-+
-+ return IRQ_HANDLED;
-+}
-+
-+/*
-+ * Programs the next timer interrupt needed. Called when dynamic tick is
-+ * enabled, and to reprogram the ticks to skip from pm_idle. The CPU goes
-+ * to sleep directly after this.
-+ */
-+static void s3c24xx_timer_reprogram_dyn_tick(unsigned long next_jiffies)
-+{
-+ int subjiffy_left = ticks_last - s3c24xx_timer_read();
-+
-+ s3c24xx_timer_program(max((int) next_jiffies, 1) << INPUT_FREQ_SHIFT);
-+ ticks_last += subjiffy_left;
-+}
-+
-+static unsigned long s3c24xx_timer_offset_dyn_tick(void)
-+{
-+ /* TODO */
-+ return 0;
-+}
-+
-+static int s3c24xx_timer_enable_dyn_tick(void)
-+{
-+ /* Set our constant prescaler. */
-+ uint32_t tcfg0 = __raw_readl(S3C2410_TCFG0);
-+ int prescaler =
-+ max(min(256, (int) pclk / (HZ << (INPUT_FREQ_SHIFT + 1))), 1);
-+
-+ tcfg0 &= ~S3C2410_TCFG_PRESCALER1_MASK;
-+ tcfg0 |= (prescaler - 1) << S3C2410_TCFG_PRESCALER1_SHIFT;
-+ __raw_writel(tcfg0, S3C2410_TCFG0);
-+
-+ /* Override handlers. */
-+ s3c2410_timer_irq.handler = s3c24xx_timer_handler;
-+ s3c24xx_timer.offset = s3c24xx_timer_offset_dyn_tick;
-+
-+ printk(KERN_INFO "dyn_tick enabled on s3c24xx timer 4, "
-+ "%li Hz pclk with prescaler %i\n", pclk, prescaler);
-+
-+ s3c24xx_timer_program_idle();
-+
-+ return 0;
-+}
-+
-+static int s3c24xx_timer_disable_dyn_tick(void)
-+{
-+ s3c2410_timer_irq.handler = s3c2410_timer_interrupt;
-+ s3c24xx_timer.offset = s3c2410_gettimeoffset;
-+ s3c2410_timer_setup();
-+
-+ return 0;
-+}
-+
-+static struct dyn_tick_timer s3c24xx_dyn_tick_timer = {
-+ .enable = s3c24xx_timer_enable_dyn_tick,
-+ .disable = s3c24xx_timer_disable_dyn_tick,
-+ .reprogram = s3c24xx_timer_reprogram_dyn_tick,
-+ .handler = s3c24xx_timer_handler_dyn_tick,
-+};
-+#endif /* CONFIG_NO_IDLE_HZ */
-+
-+struct sys_timer s3c24xx_timer = {
-+ .init = s3c2410_timer_init,
-+ .offset = s3c2410_gettimeoffset,
-+ .resume = s3c2410_timer_resume,
-+#ifdef CONFIG_NO_IDLE_HZ
-+ .dyn_tick = &s3c24xx_dyn_tick_timer,
-+#endif
-+};
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