@@ -29,3 +29,4 @@ obj-$(CONFIG_CLKSRC_SAMSUNG_PWM) += samsung_pwm_timer.o
obj-$(CONFIG_ARM_ARCH_TIMER) += arm_arch_timer.o
obj-$(CONFIG_CLKSRC_METAG_GENERIC) += metag_generic.o
+obj-$(CONFIG_ARCH_MOXART) += moxart_timer.o
new file mode 100644
@@ -0,0 +1,166 @@
+/*
+ * MOXA ART SoCs timer handling.
+ *
+ * Copyright (C) 2013 Jonas Jensen
+ *
+ * Jonas Jensen <jonas.jensen@gmail.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/clk.h>
+#include <linux/clockchips.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqreturn.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/io.h>
+#include <linux/clocksource.h>
+
+#define TIMER1_BASE 0x00
+#define TIMER2_BASE 0x10
+#define TIMER3_BASE 0x20
+
+#define REG_COUNT 0x0 /* writable */
+#define REG_LOAD 0x4
+#define REG_MATCH1 0x8
+#define REG_MATCH2 0xC
+
+#define TIMER_CR 0x30
+#define TIMER_INTR_STATE 0x34
+#define TIMER_INTR_MASK 0x38
+
+/*
+ * TIMER_CR flags:
+ *
+ * TIMEREG_CR_*_CLOCK 0: PCLK, 1: EXT1CLK
+ * TIMEREG_CR_*_INT overflow interrupt enable bit
+ */
+#define TIMEREG_CR_1_ENABLE (1 << 0)
+#define TIMEREG_CR_1_CLOCK (1 << 1)
+#define TIMEREG_CR_1_INT (1 << 2)
+#define TIMEREG_CR_2_ENABLE (1 << 3)
+#define TIMEREG_CR_2_CLOCK (1 << 4)
+#define TIMEREG_CR_2_INT (1 << 5)
+#define TIMEREG_CR_3_ENABLE (1 << 6)
+#define TIMEREG_CR_3_CLOCK (1 << 7)
+#define TIMEREG_CR_3_INT (1 << 8)
+#define TIMEREG_CR_COUNT_UP (1 << 9)
+#define TIMEREG_CR_COUNT_DOWN (0 << 9)
+
+static void __iomem *base;
+static unsigned int clock_count_per_tick;
+
+static void moxart_clkevt_mode(enum clock_event_mode mode,
+ struct clock_event_device *clk)
+{
+ u32 u = readl(base + TIMER_CR);
+
+ switch (mode) {
+ case CLOCK_EVT_MODE_RESUME:
+ case CLOCK_EVT_MODE_ONESHOT:
+ u &= ~TIMEREG_CR_1_ENABLE;
+ writel(u, base + TIMER_CR);
+ writel(~0, base + TIMER1_BASE + REG_LOAD);
+ break;
+ case CLOCK_EVT_MODE_PERIODIC:
+ writel(clock_count_per_tick, base + TIMER1_BASE + REG_LOAD);
+ u |= TIMEREG_CR_1_ENABLE;
+ writel(u, base + TIMER_CR);
+ break;
+ case CLOCK_EVT_MODE_UNUSED:
+ case CLOCK_EVT_MODE_SHUTDOWN:
+ default:
+ u &= ~TIMEREG_CR_1_ENABLE;
+ writel(u, base + TIMER_CR);
+ break;
+ }
+}
+
+static int moxart_clkevt_next_event(unsigned long cycles,
+ struct clock_event_device *unused)
+{
+ u32 u;
+ u = readl(base + TIMER1_BASE + REG_COUNT) - cycles;
+ writel(u, base + TIMER1_BASE + REG_MATCH1);
+ u = readl(base + TIMER_CR) | TIMEREG_CR_1_ENABLE;
+ writel(u, base + TIMER_CR);
+ return 0;
+}
+
+static struct clock_event_device moxart_clockevent = {
+ .name = "moxart_timer",
+ .rating = 200,
+ .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+ .set_mode = moxart_clkevt_mode,
+ .set_next_event = moxart_clkevt_next_event,
+};
+
+static irqreturn_t moxart_timer_interrupt(int irq, void *dev_id)
+{
+ struct clock_event_device *evt = dev_id;
+ evt->event_handler(evt);
+ return IRQ_HANDLED;
+}
+
+static struct irqaction moxart_timer_irq = {
+ .name = "moxart-timer",
+ .flags = IRQF_TIMER,
+ .handler = moxart_timer_interrupt,
+ .dev_id = &moxart_clockevent,
+};
+
+static void __init moxart_timer_init(struct device_node *node)
+{
+ int ret, irq;
+ unsigned long pclk;
+ struct clk *clk;
+
+ base = of_iomap(node, 0);
+ if (!base)
+ panic("%s: failed to map base\n", node->full_name);
+
+ irq = irq_of_parse_and_map(node, 0);
+ if (irq <= 0)
+ panic("%s: can't parse IRQ\n", node->full_name);
+
+ ret = setup_irq(irq, &moxart_timer_irq);
+ if (ret) {
+ pr_err("%s: failed to setup IRQ %d\n", node->full_name, irq);
+ return;
+ }
+
+ clk = of_clk_get(node, 0);
+ if (IS_ERR(clk)) {
+ pr_err("%s: of_clk_get failed\n", __func__);
+ return;
+ }
+
+ pclk = clk_get_rate(clk);
+ clock_count_per_tick = DIV_ROUND_CLOSEST(pclk, HZ);
+
+ writel(~0, base + TIMER2_BASE + REG_LOAD);
+
+ writel(TIMEREG_CR_2_ENABLE, base + TIMER_CR);
+
+ if (clocksource_mmio_init(base + TIMER2_BASE + REG_COUNT,
+ "moxart_timer", pclk, 200, 32,
+ clocksource_mmio_readl_down)) {
+ pr_err("%s: clocksource_mmio_init failed\n", __func__);
+ return;
+ }
+
+ moxart_clockevent.cpumask = cpumask_of(0);
+
+ clockevents_config_and_register(&moxart_clockevent, pclk,
+ 0x4, 0xf0000000);
+
+ pr_info("%s: %s finished pclk=%lu HZ=%d IRQ=%d\n",
+ node->full_name, __func__, pclk, HZ, irq);
+}
+CLOCKSOURCE_OF_DECLARE(moxart, "moxa,moxart-timer", moxart_timer_init);
+
This patch adds an clocksource driver for the main timer(s) found on MOXA ART SoCs. Signed-off-by: Jonas Jensen <jonas.jensen@gmail.com> --- Notes: Applies to next-20130619 Changes since v2: 1. remove unused defines: MAX_TIMER, USED_TIMER, APB_CLK 2. split register defines so each timer has a base 3. use standard multiline comments 4. replace whitespaces with tabs 5. rename "timer_base" "base" 6. rename "clock_frequency" "clock_count_per_tick" 7. disable TIMER1 in CLOCK_EVT_MODE_ONESHOT 8. remove pr_debug:s 9. in CLOCK_EVT_MODE_PERIODIC, switch order, write clock_count_per_tick to TIMER1 LOAD and enable it 10. enable TIMER1 in moxart_clkevt_next_event 11. remove IRQF_DISABLED, IRQF_IRQPOLL from irqaction flags 12. set clock_frequency exclusively from system clock 13. bail if of_clk_get fails 14. assign clock_count_per_tick to DIV_ROUND_CLOSEST(pclk, HZ) 15. align continuation lines with matching opening brace drivers/clocksource/Makefile | 1 + drivers/clocksource/moxart_timer.c | 166 +++++++++++++++++++++++++++++++++++++ 2 files changed, 167 insertions(+) create mode 100644 drivers/clocksource/moxart_timer.c