[PATCH v6 1/4] clk: hi3xxx: add clock support
Haojian Zhuang
haojian.zhuang at linaro.org
Fri Jul 26 00:32:12 EDT 2013
Add clock support with device tree on Hisilicon SoC.
Signed-off-by: Haojian Zhuang <haojian.zhuang at linaro.org>
Cc: Mike Turquette <mturquette at linaro.org>
---
.../devicetree/bindings/clock/hisilicon.txt | 66 ++++
drivers/clk/Makefile | 1 +
drivers/clk/clk-hi3xxx.c | 398 +++++++++++++++++++++
3 files changed, 465 insertions(+)
create mode 100644 Documentation/devicetree/bindings/clock/hisilicon.txt
create mode 100644 drivers/clk/clk-hi3xxx.c
diff --git a/Documentation/devicetree/bindings/clock/hisilicon.txt b/Documentation/devicetree/bindings/clock/hisilicon.txt
new file mode 100644
index 0000000..5d7a220
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/hisilicon.txt
@@ -0,0 +1,66 @@
+Device Tree Clock bindings for arch-hi3xxx
+
+This binding uses the common clock binding[1].
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+Required properties for mux clocks:
+ - compatible : Shall be "hisilicon,hi3620-clk-mux".
+ - clocks : shall be the input parent clock phandle for the clock. This should
+ be the reference clock.
+ - clock-output-names : shall be reference name.
+ - #clock-cells : from common clock binding; shall be set to 0.
+ - clkmux-reg : array of mux register offset & mask bits
+ - clkmux-table : array of mux select bits
+
+Required properties for Hi3620 gate clocks:
+ - compatible : Shall be "hisilicon,hi3620-clk-gate".
+ - clocks : shall be the input parent clock phandle for the clock. This should
+ be the reference clock.
+ - clock-output-names : shall be reference name.
+ - #clock-cells : from common clock binding; shall be set to 0.
+ - hi3620-clkgate : array of enable register offset & enable bits
+ - hi3620-clkreset : array of reset register offset & enable bits
+
+Required properties for clock divider:
+ - compatible : Shall be "hisilicon,hi3620-clk-div".
+ - clocks : shall be the input parent clock phandle for the clock. This should
+ be the reference clock.
+ - clock-output-names : shall be reference name.
+ - #clock-cells : from common clock binding; shall be set to 0.
+ - #clkdiv-table-cells : the number of parameters after phandle in
+ clkdiv-table property.
+ - clkdiv-table : list of value that are used to configure clock
+ divider. They're value of phandle, index & divider value.
+ - clkdiv : array of divider register offset & mask bits.
+
+Required properties for gate clocks:
+ - compatible : Shall be "hisilicon,clk-gate".
+ - clocks : shall be the input parent clock phandle for the clock. This should
+ be the reference clock.
+ - clock-output-names : shall be reference name.
+ - #clock-cells : from common clock binding; shall be set to 0.
+ - clkgate-inverted : bool value. True means that set-to-disable.
+
+For example:
+ timclk1: clkgate at 38 {
+ compatible = "hisilicon,clk-gate";
+ #clock-cells = <0>;
+ clocks = <&refclk_timer1>;
+ clock-output-names = "timclk1";
+ clkgate-inverted;
+ clkgate = <0 18>;
+ };
+
+ dtable: clkdiv at 0 {
+ #clkdiv-table-cells = <2>;
+ };
+
+ div_cfgaxi: clkdiv at 2 {
+ compatible = "hisilicon,hi3620-clk-div";
+ #clock-cells = <0>;
+ clocks = <&div_shareaxi>;
+ clock-output-names = "cfgAXI_div";
+ clkdiv-table = <&dtable 0x01 2>;
+ clkdiv = <0x100 0x60>;
+ };
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 4038c2b..21076ee 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_COMMON_CLK) += clk-composite.o
# SoCs specific
obj-$(CONFIG_ARCH_BCM2835) += clk-bcm2835.o
obj-$(CONFIG_ARCH_NOMADIK) += clk-nomadik.o
+obj-$(CONFIG_ARCH_HI3xxx) += clk-hi3xxx.o
obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o
obj-$(CONFIG_ARCH_NSPIRE) += clk-nspire.o
obj-$(CONFIG_ARCH_MXS) += mxs/
diff --git a/drivers/clk/clk-hi3xxx.c b/drivers/clk/clk-hi3xxx.c
new file mode 100644
index 0000000..3b041fd
--- /dev/null
+++ b/drivers/clk/clk-hi3xxx.c
@@ -0,0 +1,398 @@
+/*
+ * Hisilicon clock driver
+ *
+ * Copyright (c) 2012-2013 Hisilicon Limited.
+ * Copyright (c) 2012-2013 Linaro Limited.
+ *
+ * Author: Haojian Zhuang <haojian.zhuang at linaro.org>
+ * Xin Li <li.xin at linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/clk-provider.h>
+#include <linux/clk-private.h>
+#include <linux/clkdev.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+
+#define HI3620_DISABLE_OFF 0x4
+#define HI3620_STATUS_OFF 0x8
+
+struct hi3620_periclk {
+ struct clk_hw hw;
+ void __iomem *enable; /* enable register */
+ void __iomem *reset; /* reset register */
+ u32 ebits; /* bits in enable/disable register */
+ u32 rbits; /* bits in reset/unreset register */
+ spinlock_t *lock;
+};
+
+static void __iomem *hi3xxx_clk_base = NULL;
+
+static DEFINE_SPINLOCK(hi3xxx_clk_lock);
+
+static const struct of_device_id hi3xxx_of_match[] = {
+ { .compatible = "hisilicon,sctrl" },
+};
+
+static void __iomem __init *hi3xxx_init_clocks(struct device_node *np)
+{
+ struct device_node *parent;
+ const struct of_device_id *match;
+ void __iomem *ret = NULL;
+
+ parent = of_get_parent(np);
+ if (!parent) {
+ pr_warn("Can't find parent node of these clocks\n");
+ goto out;
+ }
+ match = of_match_node(hi3xxx_of_match, parent);
+ if (!match) {
+ pr_warn("Can't find the right parent\n");
+ goto out;
+ }
+
+ if (!hi3xxx_clk_base) {
+ ret = of_iomap(parent, 0);
+ WARN_ON(!ret);
+ hi3xxx_clk_base = ret;
+ } else {
+ ret = hi3xxx_clk_base;
+ }
+out:
+ return ret;
+}
+
+static int hi3620_clkgate_prepare(struct clk_hw *hw)
+{
+ struct hi3620_periclk *pclk;
+ unsigned long flags = 0;
+
+ pclk = container_of(hw, struct hi3620_periclk, hw);
+
+ if (pclk->lock)
+ spin_lock_irqsave(pclk->lock, flags);
+ if (pclk->reset) {
+ writel_relaxed(pclk->rbits, pclk->reset + HI3620_DISABLE_OFF);
+ readl_relaxed(pclk->reset + HI3620_STATUS_OFF);
+ }
+ if (pclk->lock)
+ spin_unlock_irqrestore(pclk->lock, flags);
+ return 0;
+}
+
+static int hi3620_clkgate_enable(struct clk_hw *hw)
+{
+ struct hi3620_periclk *pclk;
+ unsigned long flags = 0;
+
+ pclk = container_of(hw, struct hi3620_periclk, hw);
+ if (pclk->lock)
+ spin_lock_irqsave(pclk->lock, flags);
+ writel_relaxed(pclk->ebits, pclk->enable);
+ readl_relaxed(pclk->enable + HI3620_STATUS_OFF);
+ if (pclk->lock)
+ spin_unlock_irqrestore(pclk->lock, flags);
+ return 0;
+}
+
+static void hi3620_clkgate_disable(struct clk_hw *hw)
+{
+ struct hi3620_periclk *pclk;
+ unsigned long flags = 0;
+
+ pclk = container_of(hw, struct hi3620_periclk, hw);
+ if (pclk->lock)
+ spin_lock_irqsave(pclk->lock, flags);
+ writel_relaxed(pclk->ebits, pclk->enable + HI3620_DISABLE_OFF);
+ readl_relaxed(pclk->enable + HI3620_STATUS_OFF);
+ if (pclk->lock)
+ spin_unlock_irqrestore(pclk->lock, flags);
+}
+
+static struct clk_ops hi3620_clkgate_ops = {
+ .prepare = hi3620_clkgate_prepare,
+ .enable = hi3620_clkgate_enable,
+ .disable = hi3620_clkgate_disable,
+};
+
+static void __init hi3620_clkgate_setup(struct device_node *np)
+{
+ struct hi3620_periclk *pclk;
+ struct clk_init_data *init;
+ struct clk *clk;
+ const char *clk_name, *name, **parent_names;
+ u32 rdata[2], gdata[2];
+ void __iomem *base;
+
+ base = hi3xxx_init_clocks(np);
+ if (!base)
+ return;
+
+ if (of_property_read_string(np, "clock-output-names", &clk_name))
+ return;
+ if (of_property_read_u32_array(np, "hi3620-clkgate",
+ &gdata[0], 2))
+ return;
+
+ /* gate only has the fixed parent */
+ parent_names = kzalloc(sizeof(char *), GFP_KERNEL);
+ if (!parent_names)
+ return;
+ parent_names[0] = of_clk_get_parent_name(np, 0);
+
+ pclk = kzalloc(sizeof(*pclk), GFP_KERNEL);
+ if (!pclk)
+ goto err_pclk;
+
+ init = kzalloc(sizeof(*init), GFP_KERNEL);
+ if (!init)
+ goto err_init;
+ init->name = kstrdup(clk_name, GFP_KERNEL);
+ init->ops = &hi3620_clkgate_ops;
+ init->flags = CLK_SET_RATE_PARENT;
+ init->parent_names = parent_names;
+ init->num_parents = 1;
+
+ if (!of_property_read_u32_array(np, "hi3620-clkreset",
+ &rdata[0], 2)) {
+ pclk->reset = base + rdata[0];
+ pclk->rbits = rdata[1];
+ }
+ pclk->enable = base + gdata[0];
+ pclk->ebits = gdata[1];
+ pclk->lock = &hi3xxx_clk_lock;
+ pclk->hw.init = init;
+
+ clk = clk_register(NULL, &pclk->hw);
+ if (IS_ERR(clk))
+ goto err_clk;
+ if (!of_property_read_string(np, "clock-names", &name))
+ clk_register_clkdev(clk, name, NULL);
+ of_clk_add_provider(np, of_clk_src_simple_get, clk);
+ return;
+err_clk:
+ kfree(init);
+err_init:
+ kfree(pclk);
+err_pclk:
+ kfree(parent_names);
+}
+CLK_OF_DECLARE(hi3620_gate, "hisilicon,hi3620-clk-gate", hi3620_clkgate_setup)
+
+static int __init hi3xxx_parse_mux(struct device_node *np,
+ u8 *num_parents,
+ u32 *table)
+{
+ int i, cnt, ret;
+
+ /* get the count of items in mux */
+ for (i = 0, cnt = 0; ; i++, cnt++) {
+ /* parent's #clock-cells property is always 0 */
+ if (!of_parse_phandle(np, "clocks", i))
+ break;
+ }
+
+ for (i = 0; i < cnt; i++) {
+ if (!of_clk_get_parent_name(np, i))
+ return -ENOENT;
+ }
+ *num_parents = cnt;
+ table = kzalloc(sizeof(u32 *) * cnt, GFP_KERNEL);
+ if (!table)
+ return -ENOMEM;
+ ret = of_property_read_u32_array(np, "clkmux-table",
+ table, cnt);
+ if (ret)
+ goto err;
+ return 0;
+err:
+ kfree(table);
+ return ret;
+}
+
+static void __init clkmux_setup(struct device_node *np, int mode)
+{
+ struct clk *clk;
+ const char *clk_name, **parent_names = NULL;
+ u32 rdata[2], mask, *table = NULL;
+ u8 num_parents, shift, clk_mux_flags = 0;
+ void __iomem *reg, *base;
+ int i, ret;
+
+ base = hi3xxx_init_clocks(np);
+ if (!base)
+ return;
+
+ if (of_property_read_string(np, "clock-output-names", &clk_name))
+ return;
+ if (of_property_read_u32_array(np, "clkmux-reg",
+ &rdata[0], 2))
+ return;
+ ret = hi3xxx_parse_mux(np, &num_parents, table);
+ if (ret)
+ return;
+
+ parent_names = kzalloc(sizeof(char *) * num_parents, GFP_KERNEL);
+ if (!parent_names)
+ goto err;
+ for (i = 0; i < num_parents; i++)
+ parent_names[i] = of_clk_get_parent_name(np, i);
+
+ reg = base + rdata[0];
+ shift = ffs(rdata[1]) - 1;
+ mask = rdata[1] >> shift;
+ if (mode)
+ clk_mux_flags = CLK_MUX_HIWORD_MASK;
+ clk = clk_register_mux_table(NULL, clk_name, parent_names, num_parents,
+ CLK_SET_RATE_PARENT, reg, shift, mask,
+ clk_mux_flags, table, &hi3xxx_clk_lock);
+ if (IS_ERR(clk))
+ goto err_clk;
+ of_clk_add_provider(np, of_clk_src_simple_get, clk);
+
+ return;
+err_clk:
+ kfree(parent_names);
+err:
+ kfree(table);
+}
+
+static void __init hi3620_clkmux_setup(struct device_node *np)
+{
+ clkmux_setup(np, 1);
+}
+CLK_OF_DECLARE(hi3620_mux, "hisilicon,hi3620-clk-mux", hi3620_clkmux_setup)
+
+static void __init hi3xxx_clkmux_setup(struct device_node *np)
+{
+ clkmux_setup(np, 0);
+}
+CLK_OF_DECLARE(hi3xxx_mux, "hisilicon,clk-mux", hi3xxx_clkmux_setup)
+
+static void __init hs_clkgate_setup(struct device_node *np)
+{
+ struct clk *clk;
+ const char *clk_name, **parent_names, *name;
+ unsigned long flags = 0;
+ u32 data[2];
+ void __iomem *base;
+
+ base = hi3xxx_init_clocks(np);
+ if (!base)
+ return;
+ if (of_property_read_string(np, "clock-output-names", &clk_name))
+ return;
+ if (of_property_read_u32_array(np, "clkgate",
+ &data[0], 2))
+ return;
+ if (of_property_read_bool(np, "clkgate-inverted"))
+ flags = CLK_GATE_SET_TO_DISABLE;
+ /* gate only has the fixed parent */
+ parent_names = kzalloc(sizeof(char *), GFP_KERNEL);
+ if (!parent_names)
+ return;
+ parent_names[0] = of_clk_get_parent_name(np, 0);
+
+ clk = clk_register_gate(NULL, clk_name, parent_names[0], 0,
+ base + data[0], (u8)data[1], flags,
+ &hi3xxx_clk_lock);
+ if (IS_ERR(clk))
+ goto err;
+ if (!of_property_read_string(np, "clock-names", &name))
+ clk_register_clkdev(clk, name, NULL);
+ of_clk_add_provider(np, of_clk_src_simple_get, clk);
+ return;
+err:
+ kfree(parent_names);
+}
+CLK_OF_DECLARE(hs_gate, "hisilicon,clk-gate", hs_clkgate_setup)
+
+void __init hi3620_clkdiv_setup(struct device_node *np)
+{
+ struct clk *clk;
+ const char *clk_name, **parent_names;
+ struct clk_div_table *table;
+ unsigned int table_num;
+ int i;
+ u32 data[2];
+ u8 shift, width;
+ const char *propname = "clkdiv-table";
+ const char *cellname = "#clkdiv-table-cells";
+ struct of_phandle_args div_table;
+ void __iomem *reg, *base;
+
+ base = hi3xxx_init_clocks(np);
+ if (!base)
+ return;
+
+ if (of_property_read_string(np, "clock-output-names", &clk_name))
+ return;
+ if (of_property_read_u32_array(np, "clkdiv", &data[0], 2))
+ return;
+
+ /*process the div_table*/
+ for (i = 0; ; i++) {
+ if (of_parse_phandle_with_args(np, propname, cellname,
+ i, &div_table))
+ break;
+ }
+
+ /*table ends with <0, 0>, so plus one to table_num*/
+ table_num = i + 1;
+
+ table = kzalloc(sizeof(struct clk_div_table) * table_num, GFP_KERNEL);
+ if (!table)
+ return ;
+
+ for (i = 0; ; i++) {
+ if (of_parse_phandle_with_args(np, propname, cellname,
+ i, &div_table))
+ break;
+
+ table[i].val = div_table.args[0];
+ table[i].div = div_table.args[1];
+ }
+
+ /* gate only has the fixed parent */
+ parent_names = kzalloc(sizeof(char *), GFP_KERNEL);
+ if (!parent_names)
+ goto err_par;
+ parent_names[0] = of_clk_get_parent_name(np, 0);
+ reg = base + data[0];
+ shift = ffs(data[1]) - 1;
+ width = fls(data[1]) - ffs(data[1]) + 1;
+ clk = clk_register_divider_table(NULL, clk_name, parent_names[0], 0,
+ reg, shift, width,
+ CLK_DIVIDER_HIWORD_MASK,
+ table, &hi3xxx_clk_lock);
+ if (IS_ERR(clk))
+ goto err_clk;
+ of_clk_add_provider(np, of_clk_src_simple_get, clk);
+ return;
+err_clk:
+ kfree(parent_names);
+err_par:
+ kfree(table);
+}
+CLK_OF_DECLARE(hi3620_div, "hisilicon,hi3620-clk-div", hi3620_clkdiv_setup)
--
1.8.1.2
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