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authorJohn Crispin <john@openwrt.org>2014-11-26 09:00:08 +0000
committerJohn Crispin <john@openwrt.org>2014-11-26 09:00:08 +0000
commit72b58f2eb12ad4aa0c59481d0911dc5e39180eb5 (patch)
treebe51e2d36c4175443bd3ab42824df80c6b9a2efe /target/linux/oxnas/files/drivers/clocksource
parent40da7aae54ad7f098064f18e28eb8201afedfd5c (diff)
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add new target 'oxnas'
This is the oxnas target previously developed at http://gitorious.org/openwrt-oxnas Basically, this consolidates the changes and addtionas from http://github.org/kref/linux-oxnas into a new OpenWrt hardware target 'oxnas' adding support for PLX Technology NAS7820/NAS7821/NAS7825/... formally known as Oxford Semiconductor OXE810SE/OXE815/OX820/... For now there are 4 supported boards: Cloud Engines Pogoplug V3 (without PCIe) fully supported Cloud Engines Pogoplug Pro (with PCIe) fully supported MitraStar STG-212 aka ZyXEL NSA-212, aka Medion Akoya P89625 / P89636 / P89626 / P89630, aka Medion MD 86407 / MD 86805 / MD 86517 / MD 86587 fully supported, see http://wiki.openwrt.org/toh/medion/md86587 Shuttle KD-20 partially supported (S-ATA driver lacks support for 2nd port) Signed-off-by: Daniel Golle <daniel@makrotopia.org> SVN-Revision: 43388
Diffstat (limited to 'target/linux/oxnas/files/drivers/clocksource')
-rw-r--r--target/linux/oxnas/files/drivers/clocksource/oxnas_rps_timer.c96
1 files changed, 96 insertions, 0 deletions
diff --git a/target/linux/oxnas/files/drivers/clocksource/oxnas_rps_timer.c b/target/linux/oxnas/files/drivers/clocksource/oxnas_rps_timer.c
new file mode 100644
index 0000000000..7c8c4cf435
--- /dev/null
+++ b/target/linux/oxnas/files/drivers/clocksource/oxnas_rps_timer.c
@@ -0,0 +1,96 @@
+/*
+ * arch/arm/mach-ox820/rps-time.c
+ *
+ * Copyright (C) 2009 Oxford Semiconductor Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/clockchips.h>
+#include <linux/clk.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/sched_clock.h>
+#include <mach/hardware.h>
+
+enum {
+ TIMER_LOAD = 0,
+ TIMER_CURR = 4,
+ TIMER_CTRL = 8,
+ TIMER_CLRINT = 0xC,
+
+ TIMER_BITS = 24,
+
+ TIMER_MAX_VAL = (1 << TIMER_BITS) - 1,
+
+ TIMER_PERIODIC = (1 << 6),
+ TIMER_ENABLE = (1 << 7),
+
+ TIMER_DIV1 = (0 << 2),
+ TIMER_DIV16 = (1 << 2),
+ TIMER_DIV256 = (2 << 2),
+
+ TIMER1_OFFSET = 0,
+ TIMER2_OFFSET = 0x20,
+
+};
+
+static u64 notrace rps_read_sched_clock(void)
+{
+ return ~readl_relaxed(RPSA_TIMER2_VAL);
+}
+
+static void __init rps_clocksource_init(void __iomem *base, ulong ref_rate)
+{
+ int ret;
+ ulong clock_rate;
+ /* use prescale 16 */
+ clock_rate = ref_rate / 16;
+
+ iowrite32(TIMER_MAX_VAL, base + TIMER_LOAD);
+ iowrite32(TIMER_PERIODIC | TIMER_ENABLE | TIMER_DIV16,
+ base + TIMER_CTRL);
+
+ ret = clocksource_mmio_init(base + TIMER_CURR, "rps_clocksource_timer",
+ clock_rate, 250, TIMER_BITS,
+ clocksource_mmio_readl_down);
+ if (ret)
+ panic("can't register clocksource\n");
+
+ sched_clock_register(rps_read_sched_clock, TIMER_BITS, clock_rate);
+}
+
+static void __init rps_timer_init(struct device_node *np)
+{
+ struct clk *refclk;
+ unsigned long ref_rate;
+ void __iomem *base;
+
+ refclk = of_clk_get(np, 0);
+
+ if (IS_ERR(refclk) || clk_prepare_enable(refclk))
+ panic("rps_timer_init: failed to get refclk\n");
+ ref_rate = clk_get_rate(refclk);
+
+ base = of_iomap(np, 0);
+ if (!base)
+ panic("rps_timer_init: failed to map io\n");
+
+ rps_clocksource_init(base + TIMER2_OFFSET, ref_rate);
+}
+
+CLOCKSOURCE_OF_DECLARE(nas782x, "plxtech,nas782x-rps-timer", rps_timer_init);