diff options
Diffstat (limited to 'drivers/clocksource/h8300_timer8.c')
| -rw-r--r-- | drivers/clocksource/h8300_timer8.c | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c deleted file mode 100644 index 47114c2a7cb5..000000000000 --- a/drivers/clocksource/h8300_timer8.c +++ /dev/null @@ -1,211 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * linux/arch/h8300/kernel/cpu/timer/timer8.c - * - * Yoshinori Sato <ysato@users.sourcefoge.jp> - * - * 8bit Timer driver - * - */ - -#include <linux/errno.h> -#include <linux/kernel.h> -#include <linux/interrupt.h> -#include <linux/init.h> -#include <linux/clockchips.h> -#include <linux/clk.h> -#include <linux/io.h> -#include <linux/of.h> -#include <linux/of_address.h> -#include <linux/of_irq.h> - -#define _8TCR 0 -#define _8TCSR 2 -#define TCORA 4 -#define TCORB 6 -#define _8TCNT 8 - -#define CMIEA 6 -#define CMFA 6 - -#define FLAG_STARTED (1 << 3) - -#define SCALE 64 - -#define bset(b, a) iowrite8(ioread8(a) | (1 << (b)), (a)) -#define bclr(b, a) iowrite8(ioread8(a) & ~(1 << (b)), (a)) - -struct timer8_priv { - struct clock_event_device ced; - void __iomem *mapbase; - unsigned long flags; - unsigned int rate; -}; - -static irqreturn_t timer8_interrupt(int irq, void *dev_id) -{ - struct timer8_priv *p = dev_id; - - if (clockevent_state_oneshot(&p->ced)) - iowrite16be(0x0000, p->mapbase + _8TCR); - - p->ced.event_handler(&p->ced); - - bclr(CMFA, p->mapbase + _8TCSR); - - return IRQ_HANDLED; -} - -static void timer8_set_next(struct timer8_priv *p, unsigned long delta) -{ - if (delta >= 0x10000) - pr_warn("delta out of range\n"); - bclr(CMIEA, p->mapbase + _8TCR); - iowrite16be(delta, p->mapbase + TCORA); - iowrite16be(0x0000, p->mapbase + _8TCNT); - bclr(CMFA, p->mapbase + _8TCSR); - bset(CMIEA, p->mapbase + _8TCR); -} - -static int timer8_enable(struct timer8_priv *p) -{ - iowrite16be(0xffff, p->mapbase + TCORA); - iowrite16be(0x0000, p->mapbase + _8TCNT); - iowrite16be(0x0c02, p->mapbase + _8TCR); - - return 0; -} - -static int timer8_start(struct timer8_priv *p) -{ - int ret; - - if ((p->flags & FLAG_STARTED)) - return 0; - - ret = timer8_enable(p); - if (!ret) - p->flags |= FLAG_STARTED; - - return ret; -} - -static void timer8_stop(struct timer8_priv *p) -{ - iowrite16be(0x0000, p->mapbase + _8TCR); -} - -static inline struct timer8_priv *ced_to_priv(struct clock_event_device *ced) -{ - return container_of(ced, struct timer8_priv, ced); -} - -static void timer8_clock_event_start(struct timer8_priv *p, unsigned long delta) -{ - timer8_start(p); - timer8_set_next(p, delta); -} - -static int timer8_clock_event_shutdown(struct clock_event_device *ced) -{ - timer8_stop(ced_to_priv(ced)); - return 0; -} - -static int timer8_clock_event_periodic(struct clock_event_device *ced) -{ - struct timer8_priv *p = ced_to_priv(ced); - - pr_info("%s: used for periodic clock events\n", ced->name); - timer8_stop(p); - timer8_clock_event_start(p, (p->rate + HZ/2) / HZ); - - return 0; -} - -static int timer8_clock_event_oneshot(struct clock_event_device *ced) -{ - struct timer8_priv *p = ced_to_priv(ced); - - pr_info("%s: used for oneshot clock events\n", ced->name); - timer8_stop(p); - timer8_clock_event_start(p, 0x10000); - - return 0; -} - -static int timer8_clock_event_next(unsigned long delta, - struct clock_event_device *ced) -{ - struct timer8_priv *p = ced_to_priv(ced); - - BUG_ON(!clockevent_state_oneshot(ced)); - timer8_set_next(p, delta - 1); - - return 0; -} - -static struct timer8_priv timer8_priv = { - .ced = { - .name = "h8300_8timer", - .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, - .rating = 200, - .set_next_event = timer8_clock_event_next, - .set_state_shutdown = timer8_clock_event_shutdown, - .set_state_periodic = timer8_clock_event_periodic, - .set_state_oneshot = timer8_clock_event_oneshot, - }, -}; - -static int __init h8300_8timer_init(struct device_node *node) -{ - void __iomem *base; - int irq, ret; - struct clk *clk; - - clk = of_clk_get(node, 0); - if (IS_ERR(clk)) { - pr_err("failed to get clock for clockevent\n"); - return PTR_ERR(clk); - } - - ret = -ENXIO; - base = of_iomap(node, 0); - if (!base) { - pr_err("failed to map registers for clockevent\n"); - goto free_clk; - } - - ret = -EINVAL; - irq = irq_of_parse_and_map(node, 0); - if (!irq) { - pr_err("failed to get irq for clockevent\n"); - goto unmap_reg; - } - - timer8_priv.mapbase = base; - - timer8_priv.rate = clk_get_rate(clk) / SCALE; - if (!timer8_priv.rate) { - pr_err("Failed to get rate for the clocksource\n"); - goto unmap_reg; - } - - if (request_irq(irq, timer8_interrupt, IRQF_TIMER, - timer8_priv.ced.name, &timer8_priv) < 0) { - pr_err("failed to request irq %d for clockevent\n", irq); - goto unmap_reg; - } - - clockevents_config_and_register(&timer8_priv.ced, - timer8_priv.rate, 1, 0x0000ffff); - - return 0; -unmap_reg: - iounmap(base); -free_clk: - clk_put(clk); - return ret; -} - -TIMER_OF_DECLARE(h8300_8bit, "renesas,8bit-timer", h8300_8timer_init); |