[U-Boot] [PATCH v8 6/8] arm: faraday: add FTTMR010 timer support

[Kuo-Jung Su]

From: Kuo-Jung Su <dantesu at faraday-tech.com>

Faraday FTTMR010 is a simple APB device which supports
generic timer functions.

Signed-off-by: Kuo-Jung Su <dantesu at faraday-tech.com>
CC: Albert Aribaud <albert.u.boot at aribaud.net>
---
Changes for v8:
	- Nothing updates

Changes for v7:
	- Update license to use SPDX identifiers.

Changes for v6:
	- Nothing updates

Changes for v5:
	- Drop IRQ dependant implementation
	- Use gd->arch.timer_rate_hz for timer clock source
	- Use gd->arch.tbl for timestamp

Changes for v4:
	- Coding Style cleanup.
	- Break up from [arm: add Faraday A36x SoC platform support]

Changes for v3:
	- Coding Style cleanup.
	- Drop macros for wirtel()/readl(), call them directly.
	- Always insert a blank line between declarations and code.
	- Add '__iomem' to all the declaration of HW register pointers.

Changes for v2:
	- Coding Style cleanup.
	- Use readl(), writel(), clrsetbits_le32() to replace REG() macros.
	- Use structure based hardware registers to replace the macro constants.
	- Replace BIT() with BIT_MASK().

 arch/arm/cpu/faraday/Makefile   |    1 +
 arch/arm/cpu/faraday/fttmr010.c |  123 +++++++++++++++++++++++++++++++++++++++
 include/faraday/fttmr010.h      |   17 ++++++
 3 files changed, 141 insertions(+)
 create mode 100644 arch/arm/cpu/faraday/fttmr010.c

diff --git a/arch/arm/cpu/faraday/Makefile b/arch/arm/cpu/faraday/Makefile
index 9bcdeba..19c5796 100644
--- a/arch/arm/cpu/faraday/Makefile
+++ b/arch/arm/cpu/faraday/Makefile
@@ -9,4 +9,5 @@ extra-y := start.o

 obj-y   += cpu.o cache.o

+obj-$(CONFIG_FTTMR010)    += fttmr010.o
 obj-$(CONFIG_FTPWMTMR010) += ftpwmtmr010.o
diff --git a/arch/arm/cpu/faraday/fttmr010.c b/arch/arm/cpu/faraday/fttmr010.c
new file mode 100644
index 0000000..28b0086
--- /dev/null
+++ b/arch/arm/cpu/faraday/fttmr010.c
@@ -0,0 +1,123 @@
+/*
+ * (C) Copyright 2013
+ * Faraday Technology Corporation. <http://www.faraday-tech.com/tw/>
+ * Kuo-Jung Su <dantesu at gmail.com>
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <faraday/fttmr010.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static struct fttmr010 *regs = (void __iomem *)CONFIG_FTTMR010_BASE;
+
+void udelay_masked(unsigned long usec)
+{
+	ulong freq = gd->arch.timer_rate_hz;
+
+	/* Disable Timer2 */
+	clrbits_le32(&regs->cr, FTTMR010_TM2_CRMASK);
+	/* Disable Timer2 interrupts */
+	writel(FTTMR010_TM2_ISRMASK, &regs->interrupt_mask);
+	/* Clear Timer2 interrupts */
+	writel(FTTMR010_TM2_ISRMASK, &regs->interrupt_state);
+
+	/* Configure Timer2 */
+	writel((freq / 1000000) * usec, &regs->timer2_counter);
+	writel(0, &regs->timer2_load);
+	writel(0, &regs->timer2_match1);
+	writel(0, &regs->timer2_match2);
+
+	/* Enable Timer2 */
+	setbits_le32(&regs->cr,
+		FTTMR010_TM2_OFENABLE | FTTMR010_TM2_ENABLE);
+
+	/* Wait until timeout */
+	while (!(readl(&regs->interrupt_state) & FTTMR010_TM2_ISRMASK))
+		;
+}
+
+void reset_timer_masked(void)
+{
+	ulong freq = gd->arch.timer_rate_hz;
+
+	/* Disable Timer1 */
+	clrbits_le32(&regs->cr, FTTMR010_TM1_CRMASK);
+
+	/* Disable & Clear Timer1 interrupts */
+	writel(FTTMR010_TM1_ISRMASK, &regs->interrupt_mask);
+	writel(FTTMR010_TM1_ISRMASK, &regs->interrupt_state);
+
+	/* Setup a longest periodic timer */
+	writel((0xffffffff / freq) * freq, &regs->timer1_counter);
+	writel((0xffffffff / freq) * freq, &regs->timer1_load);
+
+	writel(0, &regs->timer1_match1);
+	writel(0, &regs->timer1_match2);
+
+	/* Disable match interrupts */
+	writel(FTTMR010_TM1_MATCH1 | FTTMR010_TM1_MATCH2,
+		&regs->interrupt_mask);
+
+	/* Enable Timer1 with overflow interrupt */
+	setbits_le32(&regs->cr,
+		FTTMR010_TM1_OFENABLE | FTTMR010_TM1_ENABLE);
+}
+
+ulong get_timer_masked(void)
+{
+	ulong freq = gd->arch.timer_rate_hz;
+	ulong secs = 0xffffffff / freq;
+	ulong ms = freq / CONFIG_SYS_HZ;
+
+	if (readl(&regs->interrupt_state) & FTTMR010_TM1_ISRMASK) {
+		writel(FTTMR010_TM1_ISRMASK, &regs->interrupt_state);
+		gd->arch.tbl += secs * CONFIG_SYS_HZ;
+	}
+
+	return gd->arch.tbl
+		+ ((secs * freq) - readl(&regs->timer1_counter)) / ms;
+}
+
+int timer_init(void)
+{
+	gd->arch.tbl = 0;
+	reset_timer_masked();
+	return 0;
+}
+
+void reset_timer(void)
+{
+	reset_timer_masked();
+}
+
+ulong get_timer(ulong base)
+{
+	return get_timer_masked() - base;
+}
+
+void __udelay(unsigned long usec)
+{
+	udelay_masked(usec);
+}
+
+/*
+ * This function is derived from PowerPC code (read timebase as long long).
+ * On ARM it just returns the timer value.
+ */
+unsigned long long get_ticks(void)
+{
+	return get_timer(0);
+}
+
+/*
+ * This function is derived from PowerPC code (timebase clock frequency).
+ * On ARM it returns the number of timer ticks per second.
+ */
+ulong get_tbclk(void)
+{
+	return CONFIG_SYS_HZ;
+}
diff --git a/include/faraday/fttmr010.h b/include/faraday/fttmr010.h
index 2ab68d1..21ab113 100644
--- a/include/faraday/fttmr010.h
+++ b/include/faraday/fttmr010.h
@@ -45,6 +45,16 @@ struct fttmr010 {
 #define FTTMR010_TM1_CLOCK	(1 << 1)
 #define FTTMR010_TM1_ENABLE	(1 << 0)

+#define FTTMR010_TM1_CRMASK \
+	(FTTMR010_TM1_UPDOWN | FTTMR010_TM1_OFENABLE \
+	| FTTMR010_TM1_CLOCK | FTTMR010_TM1_ENABLE)
+#define FTTMR010_TM2_CRMASK \
+	(FTTMR010_TM2_UPDOWN | FTTMR010_TM2_OFENABLE \
+	| FTTMR010_TM2_CLOCK | FTTMR010_TM2_ENABLE)
+#define FTTMR010_TM3_CRMASK \
+	(FTTMR010_TM3_UPDOWN | FTTMR010_TM3_OFENABLE \
+	| FTTMR010_TM3_CLOCK | FTTMR010_TM3_ENABLE)
+
 /*
  * Timer Interrupt State & Mask Registers
  */
@@ -58,4 +68,11 @@ struct fttmr010 {
 #define FTTMR010_TM1_MATCH2	(1 << 1)
 #define FTTMR010_TM1_MATCH1	(1 << 0)

+#define FTTMR010_TM1_ISRMASK \
+	(FTTMR010_TM1_OVERFLOW | FTTMR010_TM1_MATCH2 | FTTMR010_TM1_MATCH1)
+#define FTTMR010_TM2_ISRMASK \
+	(FTTMR010_TM2_OVERFLOW | FTTMR010_TM2_MATCH2 | FTTMR010_TM2_MATCH1)
+#define FTTMR010_TM3_ISRMASK \
+	(FTTMR010_TM3_OVERFLOW | FTTMR010_TM3_MATCH2 | FTTMR010_TM3_MATCH1)
+
 #endif	/* __FTTMR010_H */
--
1.7.9.5