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path: root/drivers/clocksource/h8300_tpu.c
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Diffstat (limited to 'drivers/clocksource/h8300_tpu.c')
-rw-r--r--drivers/clocksource/h8300_tpu.c158
1 files changed, 0 insertions, 158 deletions
diff --git a/drivers/clocksource/h8300_tpu.c b/drivers/clocksource/h8300_tpu.c
deleted file mode 100644
index 17d4ab0f6ad1..000000000000
--- a/drivers/clocksource/h8300_tpu.c
+++ /dev/null
@@ -1,158 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * H8S TPU Driver
- *
- * Copyright 2015 Yoshinori Sato <ysato@users.sourcefoge.jp>
- *
- */
-
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/clocksource.h>
-#include <linux/clk.h>
-#include <linux/io.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-
-#define TCR 0x0
-#define TSR 0x5
-#define TCNT 0x6
-
-#define TCFV 0x10
-
-struct tpu_priv {
- struct clocksource cs;
- void __iomem *mapbase1;
- void __iomem *mapbase2;
- raw_spinlock_t lock;
- unsigned int cs_enabled;
-};
-
-static inline unsigned long read_tcnt32(struct tpu_priv *p)
-{
- unsigned long tcnt;
-
- tcnt = ioread16be(p->mapbase1 + TCNT) << 16;
- tcnt |= ioread16be(p->mapbase2 + TCNT);
- return tcnt;
-}
-
-static int tpu_get_counter(struct tpu_priv *p, unsigned long long *val)
-{
- unsigned long v1, v2, v3;
- int o1, o2;
-
- o1 = ioread8(p->mapbase1 + TSR) & TCFV;
-
- /* Make sure the timer value is stable. Stolen from acpi_pm.c */
- do {
- o2 = o1;
- v1 = read_tcnt32(p);
- v2 = read_tcnt32(p);
- v3 = read_tcnt32(p);
- o1 = ioread8(p->mapbase1 + TSR) & TCFV;
- } while (unlikely((o1 != o2) || (v1 > v2 && v1 < v3)
- || (v2 > v3 && v2 < v1) || (v3 > v1 && v3 < v2)));
-
- *val = v2;
- return o1;
-}
-
-static inline struct tpu_priv *cs_to_priv(struct clocksource *cs)
-{
- return container_of(cs, struct tpu_priv, cs);
-}
-
-static u64 tpu_clocksource_read(struct clocksource *cs)
-{
- struct tpu_priv *p = cs_to_priv(cs);
- unsigned long flags;
- unsigned long long value;
-
- raw_spin_lock_irqsave(&p->lock, flags);
- if (tpu_get_counter(p, &value))
- value += 0x100000000;
- raw_spin_unlock_irqrestore(&p->lock, flags);
-
- return value;
-}
-
-static int tpu_clocksource_enable(struct clocksource *cs)
-{
- struct tpu_priv *p = cs_to_priv(cs);
-
- WARN_ON(p->cs_enabled);
-
- iowrite16be(0, p->mapbase1 + TCNT);
- iowrite16be(0, p->mapbase2 + TCNT);
- iowrite8(0x0f, p->mapbase1 + TCR);
- iowrite8(0x03, p->mapbase2 + TCR);
-
- p->cs_enabled = true;
- return 0;
-}
-
-static void tpu_clocksource_disable(struct clocksource *cs)
-{
- struct tpu_priv *p = cs_to_priv(cs);
-
- WARN_ON(!p->cs_enabled);
-
- iowrite8(0, p->mapbase1 + TCR);
- iowrite8(0, p->mapbase2 + TCR);
- p->cs_enabled = false;
-}
-
-static struct tpu_priv tpu_priv = {
- .cs = {
- .name = "H8S_TPU",
- .rating = 200,
- .read = tpu_clocksource_read,
- .enable = tpu_clocksource_enable,
- .disable = tpu_clocksource_disable,
- .mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8),
- .flags = CLOCK_SOURCE_IS_CONTINUOUS,
- },
-};
-
-#define CH_L 0
-#define CH_H 1
-
-static int __init h8300_tpu_init(struct device_node *node)
-{
- void __iomem *base[2];
- struct clk *clk;
- int ret = -ENXIO;
-
- clk = of_clk_get(node, 0);
- if (IS_ERR(clk)) {
- pr_err("failed to get clock for clocksource\n");
- return PTR_ERR(clk);
- }
-
- base[CH_L] = of_iomap(node, CH_L);
- if (!base[CH_L]) {
- pr_err("failed to map registers for clocksource\n");
- goto free_clk;
- }
- base[CH_H] = of_iomap(node, CH_H);
- if (!base[CH_H]) {
- pr_err("failed to map registers for clocksource\n");
- goto unmap_L;
- }
-
- tpu_priv.mapbase1 = base[CH_L];
- tpu_priv.mapbase2 = base[CH_H];
-
- return clocksource_register_hz(&tpu_priv.cs, clk_get_rate(clk) / 64);
-
-unmap_L:
- iounmap(base[CH_H]);
-free_clk:
- clk_put(clk);
- return ret;
-}
-
-TIMER_OF_DECLARE(h8300_tpu, "renesas,tpu", h8300_tpu_init);