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path: root/drivers/clocksource/zevio-timer.c
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Diffstat (limited to 'drivers/clocksource/zevio-timer.c')
-rw-r--r--drivers/clocksource/zevio-timer.c218
1 files changed, 0 insertions, 218 deletions
diff --git a/drivers/clocksource/zevio-timer.c b/drivers/clocksource/zevio-timer.c
deleted file mode 100644
index f74689334f7c..000000000000
--- a/drivers/clocksource/zevio-timer.c
+++ /dev/null
@@ -1,218 +0,0 @@
-/*
- * linux/drivers/clocksource/zevio-timer.c
- *
- * Copyright (C) 2013 Daniel Tang <tangrs@tangrs.id.au>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2, as
- * published by the Free Software Foundation.
- *
- */
-
-#include <linux/io.h>
-#include <linux/irq.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/clk.h>
-#include <linux/clockchips.h>
-#include <linux/cpumask.h>
-#include <linux/interrupt.h>
-#include <linux/slab.h>
-
-#define IO_CURRENT_VAL 0x00
-#define IO_DIVIDER 0x04
-#define IO_CONTROL 0x08
-
-#define IO_TIMER1 0x00
-#define IO_TIMER2 0x0C
-
-#define IO_MATCH_BEGIN 0x18
-#define IO_MATCH(x) (IO_MATCH_BEGIN + ((x) << 2))
-
-#define IO_INTR_STS 0x00
-#define IO_INTR_ACK 0x00
-#define IO_INTR_MSK 0x04
-
-#define CNTL_STOP_TIMER (1 << 4)
-#define CNTL_RUN_TIMER (0 << 4)
-
-#define CNTL_INC (1 << 3)
-#define CNTL_DEC (0 << 3)
-
-#define CNTL_TOZERO 0
-#define CNTL_MATCH(x) ((x) + 1)
-#define CNTL_FOREVER 7
-
-/* There are 6 match registers but we only use one. */
-#define TIMER_MATCH 0
-
-#define TIMER_INTR_MSK (1 << (TIMER_MATCH))
-#define TIMER_INTR_ALL 0x3F
-
-struct zevio_timer {
- void __iomem *base;
- void __iomem *timer1, *timer2;
- void __iomem *interrupt_regs;
-
- struct clk *clk;
- struct clock_event_device clkevt;
- struct irqaction clkevt_irq;
-
- char clocksource_name[64];
- char clockevent_name[64];
-};
-
-static int zevio_timer_set_event(unsigned long delta,
- struct clock_event_device *dev)
-{
- struct zevio_timer *timer = container_of(dev, struct zevio_timer,
- clkevt);
-
- writel(delta, timer->timer1 + IO_CURRENT_VAL);
- writel(CNTL_RUN_TIMER | CNTL_DEC | CNTL_MATCH(TIMER_MATCH),
- timer->timer1 + IO_CONTROL);
-
- return 0;
-}
-
-static int zevio_timer_shutdown(struct clock_event_device *dev)
-{
- struct zevio_timer *timer = container_of(dev, struct zevio_timer,
- clkevt);
-
- /* Disable timer interrupts */
- writel(0, timer->interrupt_regs + IO_INTR_MSK);
- writel(TIMER_INTR_ALL, timer->interrupt_regs + IO_INTR_ACK);
- /* Stop timer */
- writel(CNTL_STOP_TIMER, timer->timer1 + IO_CONTROL);
- return 0;
-}
-
-static int zevio_timer_set_oneshot(struct clock_event_device *dev)
-{
- struct zevio_timer *timer = container_of(dev, struct zevio_timer,
- clkevt);
-
- /* Enable timer interrupts */
- writel(TIMER_INTR_MSK, timer->interrupt_regs + IO_INTR_MSK);
- writel(TIMER_INTR_ALL, timer->interrupt_regs + IO_INTR_ACK);
- return 0;
-}
-
-static irqreturn_t zevio_timer_interrupt(int irq, void *dev_id)
-{
- struct zevio_timer *timer = dev_id;
- u32 intr;
-
- intr = readl(timer->interrupt_regs + IO_INTR_ACK);
- if (!(intr & TIMER_INTR_MSK))
- return IRQ_NONE;
-
- writel(TIMER_INTR_MSK, timer->interrupt_regs + IO_INTR_ACK);
- writel(CNTL_STOP_TIMER, timer->timer1 + IO_CONTROL);
-
- if (timer->clkevt.event_handler)
- timer->clkevt.event_handler(&timer->clkevt);
-
- return IRQ_HANDLED;
-}
-
-static int __init zevio_timer_add(struct device_node *node)
-{
- struct zevio_timer *timer;
- struct resource res;
- int irqnr, ret;
-
- timer = kzalloc(sizeof(*timer), GFP_KERNEL);
- if (!timer)
- return -ENOMEM;
-
- timer->base = of_iomap(node, 0);
- if (!timer->base) {
- ret = -EINVAL;
- goto error_free;
- }
- timer->timer1 = timer->base + IO_TIMER1;
- timer->timer2 = timer->base + IO_TIMER2;
-
- timer->clk = of_clk_get(node, 0);
- if (IS_ERR(timer->clk)) {
- ret = PTR_ERR(timer->clk);
- pr_err("Timer clock not found! (error %d)\n", ret);
- goto error_unmap;
- }
-
- timer->interrupt_regs = of_iomap(node, 1);
- irqnr = irq_of_parse_and_map(node, 0);
-
- of_address_to_resource(node, 0, &res);
- scnprintf(timer->clocksource_name, sizeof(timer->clocksource_name),
- "%llx.%s_clocksource",
- (unsigned long long)res.start, node->name);
-
- scnprintf(timer->clockevent_name, sizeof(timer->clockevent_name),
- "%llx.%s_clockevent",
- (unsigned long long)res.start, node->name);
-
- if (timer->interrupt_regs && irqnr) {
- timer->clkevt.name = timer->clockevent_name;
- timer->clkevt.set_next_event = zevio_timer_set_event;
- timer->clkevt.set_state_shutdown = zevio_timer_shutdown;
- timer->clkevt.set_state_oneshot = zevio_timer_set_oneshot;
- timer->clkevt.tick_resume = zevio_timer_set_oneshot;
- timer->clkevt.rating = 200;
- timer->clkevt.cpumask = cpu_possible_mask;
- timer->clkevt.features = CLOCK_EVT_FEAT_ONESHOT;
- timer->clkevt.irq = irqnr;
-
- writel(CNTL_STOP_TIMER, timer->timer1 + IO_CONTROL);
- writel(0, timer->timer1 + IO_DIVIDER);
-
- /* Start with timer interrupts disabled */
- writel(0, timer->interrupt_regs + IO_INTR_MSK);
- writel(TIMER_INTR_ALL, timer->interrupt_regs + IO_INTR_ACK);
-
- /* Interrupt to occur when timer value matches 0 */
- writel(0, timer->base + IO_MATCH(TIMER_MATCH));
-
- timer->clkevt_irq.name = timer->clockevent_name;
- timer->clkevt_irq.handler = zevio_timer_interrupt;
- timer->clkevt_irq.dev_id = timer;
- timer->clkevt_irq.flags = IRQF_TIMER | IRQF_IRQPOLL;
-
- setup_irq(irqnr, &timer->clkevt_irq);
-
- clockevents_config_and_register(&timer->clkevt,
- clk_get_rate(timer->clk), 0x0001, 0xffff);
- pr_info("Added %s as clockevent\n", timer->clockevent_name);
- }
-
- writel(CNTL_STOP_TIMER, timer->timer2 + IO_CONTROL);
- writel(0, timer->timer2 + IO_CURRENT_VAL);
- writel(0, timer->timer2 + IO_DIVIDER);
- writel(CNTL_RUN_TIMER | CNTL_FOREVER | CNTL_INC,
- timer->timer2 + IO_CONTROL);
-
- clocksource_mmio_init(timer->timer2 + IO_CURRENT_VAL,
- timer->clocksource_name,
- clk_get_rate(timer->clk),
- 200, 16,
- clocksource_mmio_readw_up);
-
- pr_info("Added %s as clocksource\n", timer->clocksource_name);
-
- return 0;
-error_unmap:
- iounmap(timer->base);
-error_free:
- kfree(timer);
- return ret;
-}
-
-static int __init zevio_timer_init(struct device_node *node)
-{
- return zevio_timer_add(node);
-}
-
-TIMER_OF_DECLARE(zevio_timer, "lsi,zevio-timer", zevio_timer_init);
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-06-15 23:49:31 +0000