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Message-Id: <1372341834-6557-1-git-send-email-jonas.jensen@gmail.com>
Date: Thu, 27 Jun 2013 16:03:54 +0200
From: Jonas Jensen <jonas.jensen@...il.com>
To: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org, arm@...nel.org,
mturquette@...aro.org, Jonas Jensen <jonas.jensen@...il.com>
Subject: [PATCH] clk: add MOXA ART SoCs clock driver
This patch adds MOXA ART SoCs clock driver support.
Signed-off-by: Jonas Jensen <jonas.jensen@...il.com>
---
Notes:
Applies to next-20130619
drivers/clk/Makefile | 1 +
drivers/clk/clk-moxart.c | 141 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 142 insertions(+)
create mode 100644 drivers/clk/clk-moxart.c
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index f41e3e3..92e4532 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_ARCH_VT8500) += clk-vt8500.o
obj-$(CONFIG_ARCH_ZYNQ) += zynq/
obj-$(CONFIG_ARCH_TEGRA) += tegra/
obj-$(CONFIG_PLAT_SAMSUNG) += samsung/
+obj-$(CONFIG_ARCH_MOXART) += clk-moxart.o
obj-$(CONFIG_X86) += x86/
diff --git a/drivers/clk/clk-moxart.c b/drivers/clk/clk-moxart.c
new file mode 100644
index 0000000..893a63b
--- /dev/null
+++ b/drivers/clk/clk-moxart.c
@@ -0,0 +1,141 @@
+/*
+ * MOXA ART SoCs clock driver.
+ *
+ * Copyright (C) 2013 Jonas Jensen
+ *
+ * Jonas Jensen <jonas.jensen@...il.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/of_address.h>
+#include <linux/clkdev.h>
+
+static DEFINE_SPINLOCK(_lock);
+
+struct clk_device {
+ struct clk_hw hw;
+ void __iomem *reg_pmu;
+ spinlock_t *lock;
+};
+
+static unsigned long moxart_recalc_rate(struct clk_hw *c_hw,
+ unsigned long parent_rate)
+{
+ unsigned int mul, val, div;
+ unsigned long ret;
+ struct clk_device *dev_clk = container_of(c_hw, struct clk_device, hw);
+
+ mul = (readl(dev_clk->reg_pmu + 0x30) >> 3) & 0x1ff;
+ val = (readl(dev_clk->reg_pmu + 0x0c) >> 4) & 0x7;
+
+ switch (val) {
+ case 0:
+ div = 2;
+ break;
+ case 1:
+ div = 3;
+ break;
+ case 2:
+ div = 4;
+ break;
+ case 3:
+ div = 6;
+ break;
+ case 4:
+ div = 8;
+ break;
+ default:
+ div = 2;
+ break;
+ }
+
+ ret = (mul * 1200000 / div);
+
+ /* UC-7112-LX: ret=48000000 mul=80 div=2 val=0 */
+ pr_debug("%s: ret=%lu mul=%d div=%d val=%d\n",
+ __func__, ret, mul, div, val);
+ return ret;
+}
+
+static const struct clk_ops moxart_clk_ops = {
+ .recalc_rate = moxart_recalc_rate,
+};
+
+static const struct of_device_id moxart_pmu_match[] = {
+ { .compatible = "moxa,moxart-pmu" },
+ { },
+};
+
+static const struct of_device_id moxart_sysclk_match[] = {
+ { .compatible = "moxa,moxart-sysclk" },
+ { }
+};
+
+void __init moxart_of_clk_init(void)
+{
+ struct device_node *node, *clk_node;
+ struct clk *clk;
+ struct clk_device *dev_clk;
+ struct clk_init_data init;
+ int err;
+ const char *clk_name;
+
+ dev_clk = kzalloc(sizeof(*dev_clk), GFP_KERNEL);
+ if (WARN_ON(!dev_clk))
+ return;
+
+ dev_clk->lock = &_lock;
+
+ node = of_find_matching_node(NULL, moxart_pmu_match);
+ if (!node) {
+ pr_err("%s: can't find PMU DT node\n", __func__);
+ return;
+ }
+
+ dev_clk->reg_pmu = of_iomap(node, 0);
+ if (IS_ERR(dev_clk->reg_pmu)) {
+ pr_err("%s: of_iomap failed\n", __func__);
+ return;
+ }
+
+ clk_node = of_find_matching_node(NULL, moxart_sysclk_match);
+ if (!clk_node) {
+ pr_err("%s: can't find sys_clk DT node\n", __func__);
+ return;
+ }
+
+ clk_name = clk_node->name;
+
+ of_property_read_string(clk_node, "clock-output-names",
+ &clk_name);
+
+ init.name = clk_name;
+ init.ops = &moxart_clk_ops;
+ init.flags = CLK_IS_ROOT;
+ init.num_parents = 0;
+
+ dev_clk->hw.init = &init;
+
+ clk = clk_register(NULL, &dev_clk->hw);
+
+ if (WARN_ON(IS_ERR(clk))) {
+ kfree(dev_clk);
+ return;
+ }
+
+ clk_register_clkdev(clk, NULL, clk_name);
+
+ err = of_clk_add_provider(clk_node, of_clk_src_simple_get, clk);
+
+ pr_info("%s: %s finished\n", node->full_name, __func__);
+}
--
1.8.2.1
--
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