Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 394 insertions, 0 deletions

diff --git a/include/clocksource/timer-ti-dm.h b/include/clocksource/timer-ti-dm.h
new file mode 100644
index 000000000..7d9598dc5
--- /dev/null
+++ b/include/clocksource/timer-ti-dm.h
@@ -0,0 +1,394 @@
+/*
+ * OMAP Dual-Mode Timers
+ *
+ * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
+ * Tarun Kanti DebBarma <tarun.kanti@ti.com>
+ * Thara Gopinath <thara@ti.com>
+ *
+ * Platform device conversion and hwmod support.
+ *
+ * Copyright (C) 2005 Nokia Corporation
+ * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
+ * PWM and clock framwork support by Timo Teras.
+ *
+ * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * 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.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+
+#ifndef __CLOCKSOURCE_DMTIMER_H
+#define __CLOCKSOURCE_DMTIMER_H
+
+/* clock sources */
+#define OMAP_TIMER_SRC_SYS_CLK			0x00
+#define OMAP_TIMER_SRC_32_KHZ			0x01
+#define OMAP_TIMER_SRC_EXT_CLK			0x02
+
+/* timer interrupt enable bits */
+#define OMAP_TIMER_INT_CAPTURE			(1 << 2)
+#define OMAP_TIMER_INT_OVERFLOW			(1 << 1)
+#define OMAP_TIMER_INT_MATCH			(1 << 0)
+
+/* trigger types */
+#define OMAP_TIMER_TRIGGER_NONE			0x00
+#define OMAP_TIMER_TRIGGER_OVERFLOW		0x01
+#define OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE	0x02
+
+/* posted mode types */
+#define OMAP_TIMER_NONPOSTED			0x00
+#define OMAP_TIMER_POSTED			0x01
+
+/* timer capabilities used in hwmod database */
+#define OMAP_TIMER_SECURE				0x80000000
+#define OMAP_TIMER_ALWON				0x40000000
+#define OMAP_TIMER_HAS_PWM				0x20000000
+#define OMAP_TIMER_NEEDS_RESET				0x10000000
+#define OMAP_TIMER_HAS_DSP_IRQ				0x08000000
+
+/*
+ * timer errata flags
+ *
+ * Errata i103/i767 impacts all OMAP3/4/5 devices including AM33xx. This
+ * errata prevents us from using posted mode on these devices, unless the
+ * timer counter register is never read. For more details please refer to
+ * the OMAP3/4/5 errata documents.
+ */
+#define OMAP_TIMER_ERRATA_I103_I767			0x80000000
+
+struct timer_regs {
+	u32 tidr;
+	u32 tier;
+	u32 twer;
+	u32 tclr;
+	u32 tcrr;
+	u32 tldr;
+	u32 ttrg;
+	u32 twps;
+	u32 tmar;
+	u32 tcar1;
+	u32 tsicr;
+	u32 tcar2;
+	u32 tpir;
+	u32 tnir;
+	u32 tcvr;
+	u32 tocr;
+	u32 towr;
+};
+
+struct omap_dm_timer {
+	int id;
+	int irq;
+	struct clk *fclk;
+
+	void __iomem	*io_base;
+	void __iomem	*irq_stat;	/* TISR/IRQSTATUS interrupt status */
+	void __iomem	*irq_ena;	/* irq enable */
+	void __iomem	*irq_dis;	/* irq disable, only on v2 ip */
+	void __iomem	*pend;		/* write pending */
+	void __iomem	*func_base;	/* function register base */
+
+	unsigned long rate;
+	unsigned reserved:1;
+	unsigned posted:1;
+	struct timer_regs context;
+	int (*get_context_loss_count)(struct device *);
+	int ctx_loss_count;
+	int revision;
+	u32 capability;
+	u32 errata;
+	struct platform_device *pdev;
+	struct list_head node;
+};
+
+int omap_dm_timer_reserve_systimer(int id);
+struct omap_dm_timer *omap_dm_timer_request_by_cap(u32 cap);
+
+int omap_dm_timer_get_irq(struct omap_dm_timer *timer);
+
+u32 omap_dm_timer_modify_idlect_mask(u32 inputmask);
+
+int omap_dm_timer_trigger(struct omap_dm_timer *timer);
+
+int omap_dm_timers_active(void);
+
+/*
+ * Do not use the defines below, they are not needed. They should be only
+ * used by dmtimer.c and sys_timer related code.
+ */
+
+/*
+ * The interrupt registers are different between v1 and v2 ip.
+ * These registers are offsets from timer->iobase.
+ */
+#define OMAP_TIMER_ID_OFFSET		0x00
+#define OMAP_TIMER_OCP_CFG_OFFSET	0x10
+
+#define OMAP_TIMER_V1_SYS_STAT_OFFSET	0x14
+#define OMAP_TIMER_V1_STAT_OFFSET	0x18
+#define OMAP_TIMER_V1_INT_EN_OFFSET	0x1c
+
+#define OMAP_TIMER_V2_IRQSTATUS_RAW	0x24
+#define OMAP_TIMER_V2_IRQSTATUS		0x28
+#define OMAP_TIMER_V2_IRQENABLE_SET	0x2c
+#define OMAP_TIMER_V2_IRQENABLE_CLR	0x30
+
+/*
+ * The functional registers have a different base on v1 and v2 ip.
+ * These registers are offsets from timer->func_base. The func_base
+ * is samae as io_base for v1 and io_base + 0x14 for v2 ip.
+ *
+ */
+#define OMAP_TIMER_V2_FUNC_OFFSET		0x14
+
+#define _OMAP_TIMER_WAKEUP_EN_OFFSET	0x20
+#define _OMAP_TIMER_CTRL_OFFSET		0x24
+#define		OMAP_TIMER_CTRL_GPOCFG		(1 << 14)
+#define		OMAP_TIMER_CTRL_CAPTMODE	(1 << 13)
+#define		OMAP_TIMER_CTRL_PT		(1 << 12)
+#define		OMAP_TIMER_CTRL_TCM_LOWTOHIGH	(0x1 << 8)
+#define		OMAP_TIMER_CTRL_TCM_HIGHTOLOW	(0x2 << 8)
+#define		OMAP_TIMER_CTRL_TCM_BOTHEDGES	(0x3 << 8)
+#define		OMAP_TIMER_CTRL_SCPWM		(1 << 7)
+#define		OMAP_TIMER_CTRL_CE		(1 << 6) /* compare enable */
+#define		OMAP_TIMER_CTRL_PRE		(1 << 5) /* prescaler enable */
+#define		OMAP_TIMER_CTRL_PTV_SHIFT	2 /* prescaler value shift */
+#define		OMAP_TIMER_CTRL_POSTED		(1 << 2)
+#define		OMAP_TIMER_CTRL_AR		(1 << 1) /* auto-reload enable */
+#define		OMAP_TIMER_CTRL_ST		(1 << 0) /* start timer */
+#define _OMAP_TIMER_COUNTER_OFFSET	0x28
+#define _OMAP_TIMER_LOAD_OFFSET		0x2c
+#define _OMAP_TIMER_TRIGGER_OFFSET	0x30
+#define _OMAP_TIMER_WRITE_PEND_OFFSET	0x34
+#define		WP_NONE			0	/* no write pending bit */
+#define		WP_TCLR			(1 << 0)
+#define		WP_TCRR			(1 << 1)
+#define		WP_TLDR			(1 << 2)
+#define		WP_TTGR			(1 << 3)
+#define		WP_TMAR			(1 << 4)
+#define		WP_TPIR			(1 << 5)
+#define		WP_TNIR			(1 << 6)
+#define		WP_TCVR			(1 << 7)
+#define		WP_TOCR			(1 << 8)
+#define		WP_TOWR			(1 << 9)
+#define _OMAP_TIMER_MATCH_OFFSET	0x38
+#define _OMAP_TIMER_CAPTURE_OFFSET	0x3c
+#define _OMAP_TIMER_IF_CTRL_OFFSET	0x40
+#define _OMAP_TIMER_CAPTURE2_OFFSET		0x44	/* TCAR2, 34xx only */
+#define _OMAP_TIMER_TICK_POS_OFFSET		0x48	/* TPIR, 34xx only */
+#define _OMAP_TIMER_TICK_NEG_OFFSET		0x4c	/* TNIR, 34xx only */
+#define _OMAP_TIMER_TICK_COUNT_OFFSET		0x50	/* TCVR, 34xx only */
+#define _OMAP_TIMER_TICK_INT_MASK_SET_OFFSET	0x54	/* TOCR, 34xx only */
+#define _OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET	0x58	/* TOWR, 34xx only */
+
+/* register offsets with the write pending bit encoded */
+#define	WPSHIFT					16
+
+#define OMAP_TIMER_WAKEUP_EN_REG		(_OMAP_TIMER_WAKEUP_EN_OFFSET \
+							| (WP_NONE << WPSHIFT))
+
+#define OMAP_TIMER_CTRL_REG			(_OMAP_TIMER_CTRL_OFFSET \
+							| (WP_TCLR << WPSHIFT))
+
+#define OMAP_TIMER_COUNTER_REG			(_OMAP_TIMER_COUNTER_OFFSET \
+							| (WP_TCRR << WPSHIFT))
+
+#define OMAP_TIMER_LOAD_REG			(_OMAP_TIMER_LOAD_OFFSET \
+							| (WP_TLDR << WPSHIFT))
+
+#define OMAP_TIMER_TRIGGER_REG			(_OMAP_TIMER_TRIGGER_OFFSET \
+							| (WP_TTGR << WPSHIFT))
+
+#define OMAP_TIMER_WRITE_PEND_REG		(_OMAP_TIMER_WRITE_PEND_OFFSET \
+							| (WP_NONE << WPSHIFT))
+
+#define OMAP_TIMER_MATCH_REG			(_OMAP_TIMER_MATCH_OFFSET \
+							| (WP_TMAR << WPSHIFT))
+
+#define OMAP_TIMER_CAPTURE_REG			(_OMAP_TIMER_CAPTURE_OFFSET \
+							| (WP_NONE << WPSHIFT))
+
+#define OMAP_TIMER_IF_CTRL_REG			(_OMAP_TIMER_IF_CTRL_OFFSET \
+							| (WP_NONE << WPSHIFT))
+
+#define OMAP_TIMER_CAPTURE2_REG			(_OMAP_TIMER_CAPTURE2_OFFSET \
+							| (WP_NONE << WPSHIFT))
+
+#define OMAP_TIMER_TICK_POS_REG			(_OMAP_TIMER_TICK_POS_OFFSET \
+							| (WP_TPIR << WPSHIFT))
+
+#define OMAP_TIMER_TICK_NEG_REG			(_OMAP_TIMER_TICK_NEG_OFFSET \
+							| (WP_TNIR << WPSHIFT))
+
+#define OMAP_TIMER_TICK_COUNT_REG		(_OMAP_TIMER_TICK_COUNT_OFFSET \
+							| (WP_TCVR << WPSHIFT))
+
+#define OMAP_TIMER_TICK_INT_MASK_SET_REG				\
+		(_OMAP_TIMER_TICK_INT_MASK_SET_OFFSET | (WP_TOCR << WPSHIFT))
+
+#define OMAP_TIMER_TICK_INT_MASK_COUNT_REG				\
+		(_OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET | (WP_TOWR << WPSHIFT))
+
+/*
+ * The below are inlined to optimize code size for system timers. Other code
+ * should not need these at all, see
+ * include/linux/platform_data/pwm_omap_dmtimer.h
+ */
+#if defined(CONFIG_ARCH_OMAP1) || defined(CONFIG_ARCH_OMAP2PLUS)
+static inline u32 __omap_dm_timer_read(struct omap_dm_timer *timer, u32 reg,
+						int posted)
+{
+	if (posted)
+		while (readl_relaxed(timer->pend) & (reg >> WPSHIFT))
+			cpu_relax();
+
+	return readl_relaxed(timer->func_base + (reg & 0xff));
+}
+
+static inline void __omap_dm_timer_write(struct omap_dm_timer *timer,
+					u32 reg, u32 val, int posted)
+{
+	if (posted)
+		while (readl_relaxed(timer->pend) & (reg >> WPSHIFT))
+			cpu_relax();
+
+	writel_relaxed(val, timer->func_base + (reg & 0xff));
+}
+
+static inline void __omap_dm_timer_init_regs(struct omap_dm_timer *timer)
+{
+	u32 tidr;
+
+	/* Assume v1 ip if bits [31:16] are zero */
+	tidr = readl_relaxed(timer->io_base);
+	if (!(tidr >> 16)) {
+		timer->revision = 1;
+		timer->irq_stat = timer->io_base + OMAP_TIMER_V1_STAT_OFFSET;
+		timer->irq_ena = timer->io_base + OMAP_TIMER_V1_INT_EN_OFFSET;
+		timer->irq_dis = timer->io_base + OMAP_TIMER_V1_INT_EN_OFFSET;
+		timer->pend = timer->io_base + _OMAP_TIMER_WRITE_PEND_OFFSET;
+		timer->func_base = timer->io_base;
+	} else {
+		timer->revision = 2;
+		timer->irq_stat = timer->io_base + OMAP_TIMER_V2_IRQSTATUS;
+		timer->irq_ena = timer->io_base + OMAP_TIMER_V2_IRQENABLE_SET;
+		timer->irq_dis = timer->io_base + OMAP_TIMER_V2_IRQENABLE_CLR;
+		timer->pend = timer->io_base +
+			_OMAP_TIMER_WRITE_PEND_OFFSET +
+				OMAP_TIMER_V2_FUNC_OFFSET;
+		timer->func_base = timer->io_base + OMAP_TIMER_V2_FUNC_OFFSET;
+	}
+}
+
+/*
+ * __omap_dm_timer_enable_posted - enables write posted mode
+ * @timer:      pointer to timer instance handle
+ *
+ * Enables the write posted mode for the timer. When posted mode is enabled
+ * writes to certain timer registers are immediately acknowledged by the
+ * internal bus and hence prevents stalling the CPU waiting for the write to
+ * complete. Enabling this feature can improve performance for writing to the
+ * timer registers.
+ */
+static inline void __omap_dm_timer_enable_posted(struct omap_dm_timer *timer)
+{
+	if (timer->posted)
+		return;
+
+	if (timer->errata & OMAP_TIMER_ERRATA_I103_I767) {
+		timer->posted = OMAP_TIMER_NONPOSTED;
+		__omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG, 0, 0);
+		return;
+	}
+
+	__omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG,
+			      OMAP_TIMER_CTRL_POSTED, 0);
+	timer->context.tsicr = OMAP_TIMER_CTRL_POSTED;
+	timer->posted = OMAP_TIMER_POSTED;
+}
+
+/**
+ * __omap_dm_timer_override_errata - override errata flags for a timer
+ * @timer:      pointer to timer handle
+ * @errata:	errata flags to be ignored
+ *
+ * For a given timer, override a timer errata by clearing the flags
+ * specified by the errata argument. A specific erratum should only be
+ * overridden for a timer if the timer is used in such a way the erratum
+ * has no impact.
+ */
+static inline void __omap_dm_timer_override_errata(struct omap_dm_timer *timer,
+						   u32 errata)
+{
+	timer->errata &= ~errata;
+}
+
+static inline void __omap_dm_timer_stop(struct omap_dm_timer *timer,
+					int posted, unsigned long rate)
+{
+	u32 l;
+
+	l = __omap_dm_timer_read(timer, OMAP_TIMER_CTRL_REG, posted);
+	if (l & OMAP_TIMER_CTRL_ST) {
+		l &= ~0x1;
+		__omap_dm_timer_write(timer, OMAP_TIMER_CTRL_REG, l, posted);
+#ifdef CONFIG_ARCH_OMAP2PLUS
+		/* Readback to make sure write has completed */
+		__omap_dm_timer_read(timer, OMAP_TIMER_CTRL_REG, posted);
+		/*
+		 * Wait for functional clock period x 3.5 to make sure that
+		 * timer is stopped
+		 */
+		udelay(3500000 / rate + 1);
+#endif
+	}
+
+	/* Ack possibly pending interrupt */
+	writel_relaxed(OMAP_TIMER_INT_OVERFLOW, timer->irq_stat);
+}
+
+static inline void __omap_dm_timer_load_start(struct omap_dm_timer *timer,
+						u32 ctrl, unsigned int load,
+						int posted)
+{
+	__omap_dm_timer_write(timer, OMAP_TIMER_COUNTER_REG, load, posted);
+	__omap_dm_timer_write(timer, OMAP_TIMER_CTRL_REG, ctrl, posted);
+}
+
+static inline void __omap_dm_timer_int_enable(struct omap_dm_timer *timer,
+						unsigned int value)
+{
+	writel_relaxed(value, timer->irq_ena);
+	__omap_dm_timer_write(timer, OMAP_TIMER_WAKEUP_EN_REG, value, 0);
+}
+
+static inline unsigned int
+__omap_dm_timer_read_counter(struct omap_dm_timer *timer, int posted)
+{
+	return __omap_dm_timer_read(timer, OMAP_TIMER_COUNTER_REG, posted);
+}
+
+static inline void __omap_dm_timer_write_status(struct omap_dm_timer *timer,
+						unsigned int value)
+{
+	writel_relaxed(value, timer->irq_stat);
+}
+#endif /* CONFIG_ARCH_OMAP1 || CONFIG_ARCH_OMAP2PLUS */
+#endif /* __CLOCKSOURCE_DMTIMER_H */