[U-Boot] [PATCH v12 5/8] arm: faraday: add FTPWMTMR010 timer support

[Kuo-Jung Su]

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

Faraday FTPWMTMR010 is a simple APB device which supports
both timer and pwm functions.

Signed-off-by: Kuo-Jung Su <dantesu at faraday-tech.com>
CC: Albert Aribaud <albert.u.boot at aribaud.net>
---
Changes for v12:
	- Rollback to v10.
	  Because we now always have core.[ch] inside arch/arm/cpu/faraday/<soc>/,
	  so it's no longer necessary to add some object files in
	  'arch/arm/cpu/faraday/<soc>/Makefile' to avoid linking errors.

Changes for v11:
	- Directly specify the timer object in 'arch/arm/cpu/faraday/<soc>/Makefile'
	  instead of using CONFIG_FTPWMTMR010 in 'arch/arm/cpu/faraday/Makefile'

Changes for v8, v9, v10:
	- 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/ftpwmtmr010.c |  112 ++++++++++++++++++++++++++++++++++++
 include/faraday/ftpwmtmr010.h      |   41 +++++++++++++
 3 files changed, 154 insertions(+)
 create mode 100644 arch/arm/cpu/faraday/ftpwmtmr010.c
 create mode 100644 include/faraday/ftpwmtmr010.h

diff --git a/arch/arm/cpu/faraday/Makefile b/arch/arm/cpu/faraday/Makefile
index 521147f..fe9fb21 100644
--- a/arch/arm/cpu/faraday/Makefile
+++ b/arch/arm/cpu/faraday/Makefile
@@ -10,3 +10,4 @@ extra-y := start.o
 obj-y   += cpu.o cache.o clk.o

 obj-$(CONFIG_FTTMR010)    += fttmr010.o
+obj-$(CONFIG_FTPWMTMR010) += ftpwmtmr010.o
diff --git a/arch/arm/cpu/faraday/ftpwmtmr010.c b/arch/arm/cpu/faraday/ftpwmtmr010.c
new file mode 100644
index 0000000..51b851e
--- /dev/null
+++ b/arch/arm/cpu/faraday/ftpwmtmr010.c
@@ -0,0 +1,112 @@
+/*
+ * (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/ftpwmtmr010.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define TIMER_ID    0
+
+static struct ftpwmtmr010_regs *regs =
+	(void __iomem *)CONFIG_FTPWMTMR010_BASE;
+
+void udelay_masked(unsigned long usec)
+{
+	int id = TIMER_ID + 1;
+	ulong freq = gd->arch.timer_rate_hz;
+
+	/* timer re-start */
+	writel(0, &regs->t[id].ctrl);
+	writel(BIT_MASK(id), &regs->isr);
+	writel(0, &regs->t[id].cmpb);
+	writel((freq / 1000000) * usec, &regs->t[id].cntb);
+	writel(CTRL_INTEN | CTRL_START | CTRL_UPDATE, &regs->t[id].ctrl);
+
+	/* wait for timer interrupt */
+	while (!(readl(&regs->isr) & BIT_MASK(id)))
+		;
+
+	/* timer disabled */
+	writel(0, &regs->t[id].ctrl);
+	writel(BIT_MASK(id), &regs->isr);
+}
+
+void reset_timer_masked(void)
+{
+	int id = TIMER_ID;
+	ulong freq = gd->arch.timer_rate_hz;
+
+	writel(0, &regs->t[id].ctrl);
+	writel(BIT_MASK(id), &regs->isr);
+
+	/* setup a longest periodic timer */
+	writel((0xffffffff / freq) * freq, &regs->t[id].cntb);
+
+	writel(0, &regs->t[id].cmpb);
+	writel(CTRL_AUTORELOAD | CTRL_INTEN | CTRL_START | CTRL_UPDATE,
+	       &regs->t[id].ctrl);
+}
+
+ulong get_timer_masked(void)
+{
+	int id = TIMER_ID;
+	ulong freq = gd->arch.timer_rate_hz;
+	ulong secs = 0xffffffff / freq;
+	ulong ms = freq / CONFIG_SYS_HZ;
+
+	if (readl(&regs->isr) & BIT_MASK(id)) {
+		writel(BIT_MASK(id), &regs->isr);
+		gd->arch.tbl += secs * CONFIG_SYS_HZ;
+	}
+
+	return gd->arch.tbl
+		+ ((secs * freq - readl(&regs->t[id].cnto)) / 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/ftpwmtmr010.h b/include/faraday/ftpwmtmr010.h
new file mode 100644
index 0000000..29f4f05
--- /dev/null
+++ b/include/faraday/ftpwmtmr010.h
@@ -0,0 +1,41 @@
+/*
+ * arch/arm/cpu/faraday/ftpwmtmr010.h
+ *
+ * (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+
+ */
+
+#ifndef ARCH_ARM_CPU_FARADAY_FTPWMTMR010_H
+#define ARCH_ARM_CPU_FARADAY_FTPWMTMR010_H
+
+struct ftpwmtmr010_timer {
+	uint32_t ctrl;	/* Control */
+#define CTRL_EXTCLK			(1 << 0) /* use external clock */
+#define CTRL_START			(1 << 1) /* timer start */
+#define CTRL_UPDATE			(1 << 2) /* update timer counter */
+#define CTRL_AUTORELOAD		(1 << 4) /* auto-reload timer counter */
+#define CTRL_INTEN			(1 << 5) /* interrupt enabled */
+
+	uint32_t cntb;	/* Count buffer */
+	uint32_t cmpb;	/* Compare buffer */
+	uint32_t cnto;	/* Count observation */
+};
+
+struct ftpwmtmr010_regs {
+	/* 0x00: Interrupt status register */
+	uint32_t isr;
+
+	/* 0x04 - 0x0C: Reserved */
+	uint32_t rsvd[3];
+
+	/* 0x10 - 0x8C: timer registers */
+	struct ftpwmtmr010_timer t[8];
+
+	/* 0x90: Revision register */
+	uint32_t rev;
+};
+
+#endif
--
1.7.9.5