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Date: Wed, 14 Dec 2016 01:11:52 +0100
From: Holger Dengler <dengler@...utronix.de>
To: Lee Jones <lee.jones@...aro.org>, Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Vinod Koul <vinod.koul@...el.com>
Cc: linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
Thomas Gleixner <tglx@...utronix.de>,
Sebastian Siewior <bigeasy@...utronix.de>,
Juergen Bubeck <bubeck@...ug.com>,
Peter Mahler <mahler@...ug.com>,
Holger Dengler <dengler@...utronix.de>,
Benedikt Spranger <b.spranger@...utronix.de>
Subject: [PATCH 11/12] misc: flexcard: Support timestamp trigger selection
The Flexcard timestamp counter can be triggered from two external
trigger inputs or an internal clock at 1 MHz, 10 Mhz or 100 MHz.
Add support for timestamp trigger selection.
Signed-off-by: Holger Dengler <dengler@...utronix.de>
Signed-off-by: Benedikt Spranger <b.spranger@...utronix.de>
cc: Arnd Bergmann <arnd@...db.de>
cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/misc/flexcard_posixclock.c | 63 +++++++++++++++++++++++++++++++++++---
include/uapi/linux/flexcard.h | 16 ++++++++++
2 files changed, 75 insertions(+), 4 deletions(-)
diff --git a/drivers/misc/flexcard_posixclock.c b/drivers/misc/flexcard_posixclock.c
index 146f0f3..b4cb38e 100644
--- a/drivers/misc/flexcard_posixclock.c
+++ b/drivers/misc/flexcard_posixclock.c
@@ -12,6 +12,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
+#include <linux/flexcard.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/platform_device.h>
@@ -35,12 +36,15 @@ struct flexcard_clk {
struct device *dev;
void __iomem *ts64;
void __iomem *reset;
+ u32 mul;
+ struct flexcard_clk_desc desc;
};
static int flexcard_clk_getres(struct posix_clock *pc, struct timespec *tp)
{
+ struct flexcard_clk *clk = container_of(pc, struct flexcard_clk, clock);
tp->tv_sec = 0;
- tp->tv_nsec = 1000;
+ tp->tv_nsec = clk->mul;
return 0;
}
@@ -57,8 +61,8 @@ static int flexcard_clk_gettime(struct posix_clock *pc, struct timespec *tp)
if (upper != readl(clk->ts64))
goto retry;
- tp->tv_sec = div_u64_rem(now, 1000000, &rem);
- tp->tv_nsec = rem * 1000;
+ tp->tv_sec = div_u64_rem(now, clk->desc.freq, &rem);
+ tp->tv_nsec = rem * clk->mul;
return 0;
}
@@ -77,11 +81,59 @@ static int flexcard_clk_settime(struct posix_clock *pc,
return 0;
}
+static long flexcard_clk_ioctl(struct posix_clock *pc, unsigned int cmd,
+ unsigned long arg)
+{
+ struct flexcard_clk *clk = container_of(pc, struct flexcard_clk, clock);
+ struct flexcard_clk_desc desc;
+
+ switch (cmd) {
+ case FCSCLKSRC:
+ if (copy_from_user(&desc, (void __user *)arg, sizeof(desc)))
+ return -EFAULT;
+
+ switch (desc.type) {
+ case FLEXCARD_CLK_1MHZ:
+ desc.freq = 1000000;
+ break;
+ case FLEXCARD_CLK_10MHZ:
+ desc.freq = 10000000;
+ break;
+ case FLEXCARD_CLK_100MHZ:
+ desc.freq = 100000000;
+ break;
+ case FLEXCARD_CLK_EXT1:
+ case FLEXCARD_CLK_EXT2:
+ if (desc.freq < 1 || desc.freq > NSEC_PER_SEC)
+ return -EINVAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ clk->desc = desc;
+ clk->mul = NSEC_PER_SEC/desc.freq;
+ writel(clk->desc.type, clk->ts64 + CLKSEL_OFF);
+ writel(FLEXCARD_RST_TS, clk->reset);
+
+ break;
+ case FCGCLKSRC:
+ if (copy_to_user((void __user *)arg, &clk->desc, sizeof(desc)))
+ return -EFAULT;
+ break;
+ default:
+ return -ENOTTY;
+ }
+
+ return 0;
+}
+
static struct posix_clock_operations flexcard_clk_ops = {
.owner = THIS_MODULE,
.clock_getres = flexcard_clk_getres,
.clock_gettime = flexcard_clk_gettime,
.clock_settime = flexcard_clk_settime,
+ .ioctl = flexcard_clk_ioctl,
};
static int flexcard_clk_iomap(struct platform_device *pdev)
@@ -139,8 +191,11 @@ static int flexcard_clk_probe(struct platform_device *pdev)
clk->devid = MKDEV(major, cell->id);
clk->clock.ops = flexcard_clk_ops;
+ clk->desc.type = FLEXCARD_CLK_1MHZ;
+ clk->desc.freq = 1000000;
+ clk->mul = 1000;
- writel(FLEXCARD_CLK_1MHZ, clk->ts64 + CLKSEL_OFF);
+ writel(clk->desc.type, clk->ts64 + CLKSEL_OFF);
writel(FLEXCARD_RST_TS, clk->reset);
clk->dev = device_create(flexcard_clk_class, &pdev->dev, clk->devid,
diff --git a/include/uapi/linux/flexcard.h b/include/uapi/linux/flexcard.h
index 4e9f07b4..3ad0bf4 100644
--- a/include/uapi/linux/flexcard.h
+++ b/include/uapi/linux/flexcard.h
@@ -15,6 +15,22 @@
#include <linux/types.h>
+enum flexcard_clk_type {
+ FLEXCARD_CLK_1MHZ = 0x0,
+ FLEXCARD_CLK_10MHZ = 0x1,
+ FLEXCARD_CLK_100MHZ = 0x2,
+ FLEXCARD_CLK_EXT1 = 0x11,
+ FLEXCARD_CLK_EXT2 = 0x12,
+};
+
+struct flexcard_clk_desc {
+ enum flexcard_clk_type type;
+ __u32 freq;
+};
+
+#define FCGCLKSRC _IOR(0xeb, 0, struct flexcard_clk_desc)
+#define FCSCLKSRC _IOW(0xeb, 1, struct flexcard_clk_desc)
+
struct fc_version {
__u8 dev;
__u8 min;
--
2.1.4
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