[PATCH v2 08/14] clk: hs: add clock support
Haojian Zhuang
haojian.zhuang at linaro.org
Tue Mar 12 13:08:37 EDT 2013
Add clock support with device tree on Hisilicon SoC.
Signed-off-by: Haojian Zhuang <haojian.zhuang at linaro.org>
---
drivers/clk/Makefile | 1 +
drivers/clk/clk-hi3xxx.c | 650 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 651 insertions(+)
create mode 100644 drivers/clk/clk-hi3xxx.c
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 0147022..b065e76 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_COMMON_CLK) += clk-mux.o
# SoCs specific
obj-$(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_MXS) += mxs/
obj-$(CONFIG_ARCH_SOCFPGA) += socfpga/
diff --git a/drivers/clk/clk-hi3xxx.c b/drivers/clk/clk-hi3xxx.c
new file mode 100644
index 0000000..3ff0118
--- /dev/null
+++ b/drivers/clk/clk-hi3xxx.c
@@ -0,0 +1,650 @@
+/*
+ * 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
+
+#define WIDTH_TO_MASK(width) ((1 << (width)) - 1)
+
+/*
+ * The reverse of DIV_ROUND_UP: The maximum number which
+ * divided by m is r
+ */
+#define MULT_ROUND_UP(r, m) ((r) * (m) + (m) - 1)
+
+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;
+};
+
+struct hi3620_muxclk {
+ struct clk_hw hw;
+ void __iomem *reg; /* mux register */
+ u8 shift;
+ u8 width;
+ u32 mbits; /* mask bits in mux register */
+ spinlock_t *lock;
+};
+
+struct hi3620_divclk {
+ struct clk_hw hw;
+ void __iomem *reg; /* divider register */
+ u8 shift;
+ u8 width;
+ u32 mbits; /* mask bits in divider register */
+ const struct clk_div_table *table;
+ spinlock_t *lock;
+};
+
+struct hs_clk {
+ void __iomem *pmctrl;
+ void __iomem *sctrl;
+ spinlock_t lock;
+};
+
+static struct hs_clk hs_clk;
+
+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);
+ writel_relaxed(pclk->ebits, pclk->enable + HI3620_DISABLE_OFF);
+ 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];
+
+ if (!hs_clk.sctrl)
+ return;
+
+ if (of_property_read_string(np, "clock-output-names", &clk_name))
+ return;
+ if (of_property_read_u32_array(np, "hisilicon,hi3620-clkreset",
+ &rdata[0], 2))
+ return;
+ if (of_property_read_u32_array(np, "hisilicon,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;
+
+ pclk->reset = hs_clk.sctrl + rdata[0];
+ pclk->rbits = rdata[1];
+ pclk->enable = hs_clk.sctrl + gdata[0];
+ pclk->ebits = gdata[1];
+ pclk->lock = &hs_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);
+}
+
+static u8 hi3620_clk_get_parent(struct clk_hw *hw)
+{
+ struct hi3620_muxclk *mclk;
+ u32 data;
+ unsigned long flags = 0;
+
+ mclk = container_of(hw, struct hi3620_muxclk, hw);
+
+ if (mclk->lock)
+ spin_lock_irqsave(mclk->lock, flags);
+
+ data = readl_relaxed(mclk->reg) >> mclk->shift;
+ data &= WIDTH_TO_MASK(mclk->width);
+
+ if (mclk->lock)
+ spin_unlock_irqrestore(mclk->lock, flags);
+
+ if (data >= __clk_get_num_parents(hw->clk))
+ return -EINVAL;
+
+ return (u8)data;
+}
+
+static int hi3620_clk_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct hi3620_muxclk *mclk;
+ u32 data;
+ unsigned long flags = 0;
+
+ mclk = container_of(hw, struct hi3620_muxclk, hw);
+
+ if (mclk->lock)
+ spin_lock_irqsave(mclk->lock, flags);
+
+ data = readl_relaxed(mclk->reg);
+ data &= ~(WIDTH_TO_MASK(mclk->width) << mclk->shift);
+ data |= index << mclk->shift;
+ writel_relaxed(data, mclk->reg);
+ /* set mask enable bits */
+ data |= mclk->mbits;
+ writel_relaxed(data, mclk->reg);
+
+ if (mclk->lock)
+ spin_unlock_irqrestore(mclk->lock, flags);
+
+ return 0;
+}
+
+static struct clk_ops hi3620_clkmux_ops = {
+ .get_parent = hi3620_clk_get_parent,
+ .set_parent = hi3620_clk_set_parent,
+};
+
+static void __init hi3620_clkmux_setup(struct device_node *np)
+{
+ struct hi3620_muxclk *mclk;
+ struct clk_init_data *init;
+ struct clk *clk;
+ const char *clk_name, **parent_names;
+ u32 rdata[2];
+ u8 num_parents;
+ int i;
+
+ if (!hs_clk.sctrl)
+ return;
+
+ if (of_property_read_string(np, "clock-output-names", &clk_name))
+ return;
+ if (of_property_read_u32_array(np, "hisilicon,hi3620-clkmux",
+ &rdata[0], 2))
+ return;
+ /* get the count of items in mux */
+ for (i = 0; ; i++) {
+ /* parent's #clock-cells property is always 0 */
+ if (!of_parse_phandle(np, "clocks", i))
+ break;
+ }
+ parent_names = kzalloc(sizeof(char *) * i, GFP_KERNEL);
+ if (!parent_names)
+ return;
+
+ for (num_parents = i, i = 0; i < num_parents; i++)
+ parent_names[i] = of_clk_get_parent_name(np, i);
+
+ mclk = kzalloc(sizeof(*mclk), GFP_KERNEL);
+ if (!mclk)
+ goto err_mclk;
+ init = kzalloc(sizeof(*init), GFP_KERNEL);
+ if (!init)
+ goto err_init;
+ init->name = kstrdup(clk_name, GFP_KERNEL);
+ init->ops = &hi3620_clkmux_ops;
+ init->flags = CLK_SET_RATE_PARENT;
+ init->parent_names = parent_names;
+ init->num_parents = num_parents;
+
+ mclk->reg = hs_clk.sctrl + rdata[0];
+ /* enable_mask bits are in higher 16bits */
+ mclk->mbits = rdata[1] << 16;
+ mclk->shift = ffs(rdata[1]) - 1;
+ mclk->width = fls(rdata[1]) - ffs(rdata[1]) + 1;
+ mclk->lock = &hs_clk.lock;
+ mclk->hw.init = init;
+
+ clk = clk_register(NULL, &mclk->hw);
+ if (IS_ERR(clk))
+ goto err_clk;
+ of_clk_add_provider(np, of_clk_src_simple_get, clk);
+
+ return;
+err_clk:
+ kfree(init);
+err_init:
+ kfree(mclk);
+err_mclk:
+ kfree(parent_names);
+}
+
+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];
+
+ if (!hs_clk.sctrl)
+ return;
+ if (of_property_read_string(np, "clock-output-names", &clk_name))
+ return;
+ if (of_property_read_u32_array(np, "hisilicon,clkgate",
+ &data[0], 2))
+ return;
+ if (of_property_read_bool(np, "hisilicon,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,
+ hs_clk.sctrl + data[0], (u8)data[1], flags,
+ &hs_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);
+}
+
+void __init hs_fixed_factor_clk_setup(struct device_node *np)
+{
+ struct clk *clk;
+ const char *clk_name, **parent_names;
+ u32 data[2];
+
+ if (of_property_read_string(np, "clock-output-names", &clk_name))
+ return;
+ if (of_property_read_u32_array(np, "hisilicon,fixed-factor",
+ data, 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);
+
+ clk = clk_register_fixed_factor(NULL, clk_name, parent_names[0], 0,
+ data[0], data[1]);
+ if (IS_ERR(clk))
+ goto err;
+ of_clk_add_provider(np, of_clk_src_simple_get, clk);
+ return;
+err:
+ kfree(parent_names);
+}
+
+static unsigned int hi3620_get_table_maxdiv(const struct clk_div_table *table)
+{
+ unsigned int maxdiv = 0;
+ const struct clk_div_table *clkt;
+
+ for (clkt = table; clkt->div; clkt++)
+ if (clkt->div > maxdiv)
+ maxdiv = clkt->div;
+ return maxdiv;
+}
+
+static unsigned int hi3620_get_table_div(const struct clk_div_table *table,
+ unsigned int val)
+{
+ const struct clk_div_table *clkt;
+
+ for (clkt = table; clkt->div; clkt++)
+ if (clkt->val == val)
+ return clkt->div;
+ return 0;
+}
+
+static unsigned int hi3620_get_table_val(const struct clk_div_table *table,
+ unsigned int div)
+{
+ const struct clk_div_table *clkt;
+
+ for (clkt = table; clkt->div; clkt++)
+ if (clkt->div == div)
+ return clkt->val;
+ return 0;
+}
+
+static unsigned long hi3620_clkdiv_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct hi3620_divclk *dclk = container_of(hw, struct hi3620_divclk, hw);
+ unsigned int div, val;
+
+ val = readl_relaxed(dclk->reg) >> dclk->shift;
+ val &= WIDTH_TO_MASK(dclk->width);
+
+ div = hi3620_get_table_div(dclk->table, val);
+ if (!div) {
+ pr_warning("%s: Invalid divisor for clock %s\n", __func__,
+ __clk_get_name(hw->clk));
+ return parent_rate;
+ }
+
+ return parent_rate / div;
+}
+
+static bool hi3620_is_valid_table_div(const struct clk_div_table *table,
+ unsigned int div)
+{
+ const struct clk_div_table *clkt;
+
+ for (clkt = table; clkt->div; clkt++)
+ if (clkt->div == div)
+ return true;
+ return false;
+}
+
+static int hi3620_clkdiv_bestdiv(struct clk_hw *hw, unsigned long rate,
+ unsigned long *best_parent_rate)
+{
+ struct hi3620_divclk *dclk = container_of(hw, struct hi3620_divclk, hw);
+ struct clk *clk_parent = __clk_get_parent(hw->clk);
+ int i, bestdiv = 0;
+ unsigned long parent_rate, best = 0, now, maxdiv;
+
+ maxdiv = hi3620_get_table_maxdiv(dclk->table);
+
+ if (!(__clk_get_flags(hw->clk) & CLK_SET_RATE_PARENT)) {
+ parent_rate = *best_parent_rate;
+ bestdiv = DIV_ROUND_UP(parent_rate, rate);
+ bestdiv = bestdiv == 0 ? 1 : bestdiv;
+ bestdiv = bestdiv > maxdiv ? maxdiv : bestdiv;
+ return bestdiv;
+ }
+
+ /*
+ * The maximum divider we can use without overflowing
+ * unsigned long in rate * i below
+ */
+ maxdiv = min(ULONG_MAX / rate, maxdiv);
+
+ for (i = 1; i <= maxdiv; i++) {
+ if (!hi3620_is_valid_table_div(dclk->table, i))
+ continue;
+ parent_rate = __clk_round_rate(clk_parent,
+ MULT_ROUND_UP(rate, i));
+ now = parent_rate / i;
+ if (now <= rate && now > best) {
+ bestdiv = i;
+ best = now;
+ *best_parent_rate = parent_rate;
+ }
+ }
+
+ if (!bestdiv) {
+ bestdiv = hi3620_get_table_maxdiv(dclk->table);
+ *best_parent_rate = __clk_round_rate(clk_parent, 1);
+ }
+
+ return bestdiv;
+}
+
+static long hi3620_clkdiv_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *prate)
+{
+ int div;
+
+ if (!rate)
+ rate = 1;
+ div = hi3620_clkdiv_bestdiv(hw, rate, prate);
+
+ return *prate / div;
+}
+
+static int hi3620_clkdiv_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct hi3620_divclk *dclk = container_of(hw, struct hi3620_divclk, hw);
+ unsigned int div, value;
+ unsigned long flags = 0;
+ u32 data;
+
+ div = parent_rate / rate;
+ value = hi3620_get_table_val(dclk->table, div);
+
+ if (value > WIDTH_TO_MASK(dclk->width))
+ value = WIDTH_TO_MASK(dclk->width);
+
+ if (dclk->lock)
+ spin_lock_irqsave(dclk->lock, flags);
+
+ data = readl_relaxed(dclk->reg);
+ data &= ~(WIDTH_TO_MASK(dclk->width) << dclk->shift);
+ data |= value << dclk->shift;
+ data |= dclk->mbits;
+ writel_relaxed(data, dclk->reg);
+
+ if (dclk->lock)
+ spin_unlock_irqrestore(dclk->lock, flags);
+
+ return 0;
+}
+
+static struct clk_ops hi3620_clkdiv_ops = {
+ .recalc_rate = hi3620_clkdiv_recalc_rate,
+ .round_rate = hi3620_clkdiv_round_rate,
+ .set_rate = hi3620_clkdiv_set_rate,
+};
+
+void __init hi3620_clkdiv_setup(struct device_node *np)
+{
+ struct clk *clk;
+ const char *clk_name, **parent_names;
+ struct clk_init_data *init;
+ struct clk_div_table *table;
+ struct hi3620_divclk *dclk;
+ unsigned int table_num;
+ int i;
+ u32 data[2];
+ const char *propname = "hisilicon,clkdiv-table";
+ const char *cellname = "#hisilicon,clkdiv-table-cells";
+ struct of_phandle_args div_table;
+
+ if (of_property_read_string(np, "clock-output-names", &clk_name))
+ return;
+ if (of_property_read_u32_array(np, "hisilicon,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);
+
+ dclk = kzalloc(sizeof(*dclk), GFP_KERNEL);
+ if (!dclk)
+ goto err_dclk;
+ init = kzalloc(sizeof(*init), GFP_KERNEL);
+ if (!init)
+ goto err_init;
+ init->name = kstrdup(clk_name, GFP_KERNEL);
+ init->ops = &hi3620_clkdiv_ops;
+ init->parent_names = parent_names;
+ init->num_parents = 1;
+
+ dclk->reg = hs_clk.sctrl + data[0];
+ dclk->shift = ffs(data[1]) - 1;
+ dclk->width = fls(data[1]) - ffs(data[1]) + 1;
+ dclk->mbits = data[1] << 16;
+ dclk->lock = &hs_clk.lock;
+ dclk->hw.init = init;
+ dclk->table = table;
+ clk = clk_register(NULL, &dclk->hw);
+ if (IS_ERR(clk))
+ goto err_clk;
+ of_clk_add_provider(np, of_clk_src_simple_get, clk);
+ return;
+err_clk:
+ kfree(init);
+err_init:
+ kfree(dclk);
+err_dclk:
+ kfree(parent_names);
+err_par:
+ kfree(table);
+}
+
+static const __initconst struct of_device_id hs_clk_match[] = {
+ {
+ .compatible = "fixed-clock",
+ .data = of_fixed_clk_setup,
+ }, {
+ .compatible = "hisilicon,hi3620-clk-mux",
+ .data = hi3620_clkmux_setup,
+ }, {
+ .compatible = "hisilicon,hi3620-clk-gate",
+ .data = hi3620_clkgate_setup,
+ }, {
+ .compatible = "hisilicon,hi3620-clk-div",
+ .data = hi3620_clkdiv_setup,
+ }, {
+ .compatible = "hisilicon,clk-gate",
+ .data = hs_clkgate_setup,
+ }, {
+ .compatible = "hisilicon,clk-fixed-factor",
+ .data = hs_fixed_factor_clk_setup,
+ },
+};
+
+void __init hs_init_clocks(void)
+{
+ struct device_node *node;
+
+ /* map pmctrl registers */
+ node = of_find_compatible_node(NULL, NULL, "hisilicon,pmctrl");
+ hs_clk.pmctrl = of_iomap(node, 0);
+ WARN_ON(!hs_clk.pmctrl);
+
+ node = of_find_compatible_node(NULL, NULL, "hisilicon,sctrl");
+ hs_clk.sctrl = of_iomap(node, 0);
+
+ of_clk_init(hs_clk_match);
+}
--
1.7.10.4
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