1 files changed, 352 insertions, 0 deletions
diff --git a/drivers/clk/ti/gate.c b/drivers/clk/ti/gate.c
new file mode 100644
index 000000000..0c6fdfcd5
--- /dev/null
+++ b/drivers/clk/ti/gate.c
@@ -0,0 +1,352 @@
+/*
+ * OMAP gate clock support
+ *
+ * Copyright (C) 2013 Texas Instruments, Inc.
+ *
+ * Tero Kristo <t-kristo@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/clk/ti.h>
+
+#include "clock.h"
+
+#define to_clk_divider(_hw) container_of(_hw, struct clk_divider, hw)
+
+#undef pr_fmt
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+static int omap36xx_gate_clk_enable_with_hsdiv_restore(struct clk_hw *clk);
+
+static const struct clk_ops omap_gate_clkdm_clk_ops = {
+	.init		= &omap2_init_clk_clkdm,
+	.enable		= &omap2_clkops_enable_clkdm,
+	.disable	= &omap2_clkops_disable_clkdm,
+};
+
+static const struct clk_ops omap_gate_clk_ops = {
+	.init		= &omap2_init_clk_clkdm,
+	.enable		= &omap2_dflt_clk_enable,
+	.disable	= &omap2_dflt_clk_disable,
+	.is_enabled	= &omap2_dflt_clk_is_enabled,
+};
+
+static const struct clk_ops omap_gate_clk_hsdiv_restore_ops = {
+	.init		= &omap2_init_clk_clkdm,
+	.enable		= &omap36xx_gate_clk_enable_with_hsdiv_restore,
+	.disable	= &omap2_dflt_clk_disable,
+	.is_enabled	= &omap2_dflt_clk_is_enabled,
+};
+
+/**
+ * omap36xx_gate_clk_enable_with_hsdiv_restore - enable clocks suffering
+ *         from HSDivider PWRDN problem Implements Errata ID: i556.
+ * @clk: DPLL output struct clk
+ *
+ * 3630 only: dpll3_m3_ck, dpll4_m2_ck, dpll4_m3_ck, dpll4_m4_ck,
+ * dpll4_m5_ck & dpll4_m6_ck dividers gets loaded with reset
+ * valueafter their respective PWRDN bits are set.  Any dummy write
+ * (Any other value different from the Read value) to the
+ * corresponding CM_CLKSEL register will refresh the dividers.
+ */
+static int omap36xx_gate_clk_enable_with_hsdiv_restore(struct clk_hw *clk)
+{
+	struct clk_divider *parent;
+	struct clk_hw *parent_hw;
+	u32 dummy_v, orig_v;
+	int ret;
+
+	/* Clear PWRDN bit of HSDIVIDER */
+	ret = omap2_dflt_clk_enable(clk);
+
+	/* Parent is the x2 node, get parent of parent for the m2 div */
+	parent_hw = __clk_get_hw(__clk_get_parent(__clk_get_parent(clk->clk)));
+	parent = to_clk_divider(parent_hw);
+
+	/* Restore the dividers */
+	if (!ret) {
+		orig_v = ti_clk_ll_ops->clk_readl(parent->reg);
+		dummy_v = orig_v;
+
+		/* Write any other value different from the Read value */
+		dummy_v ^= (1 << parent->shift);
+		ti_clk_ll_ops->clk_writel(dummy_v, parent->reg);
+
+		/* Write the original divider */
+		ti_clk_ll_ops->clk_writel(orig_v, parent->reg);
+	}
+
+	return ret;
+}
+
+static struct clk *_register_gate(struct device *dev, const char *name,
+				  const char *parent_name, unsigned long flags,
+				  void __iomem *reg, u8 bit_idx,
+				  u8 clk_gate_flags, const struct clk_ops *ops,
+				  const struct clk_hw_omap_ops *hw_ops)
+{
+	struct clk_init_data init = { NULL };
+	struct clk_hw_omap *clk_hw;
+	struct clk *clk;
+
+	clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
+	if (!clk_hw)
+		return ERR_PTR(-ENOMEM);
+
+	clk_hw->hw.init = &init;
+
+	init.name = name;
+	init.ops = ops;
+
+	clk_hw->enable_reg = reg;
+	clk_hw->enable_bit = bit_idx;
+	clk_hw->ops = hw_ops;
+
+	clk_hw->flags = MEMMAP_ADDRESSING | clk_gate_flags;
+
+	init.parent_names = &parent_name;
+	init.num_parents = 1;
+
+	init.flags = flags;
+
+	clk = clk_register(NULL, &clk_hw->hw);
+
+	if (IS_ERR(clk))
+		kfree(clk_hw);
+
+	return clk;
+}
+
+#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_ATAGS)
+struct clk *ti_clk_register_gate(struct ti_clk *setup)
+{
+	const struct clk_ops *ops = &omap_gate_clk_ops;
+	const struct clk_hw_omap_ops *hw_ops = NULL;
+	u32 reg;
+	struct clk_omap_reg *reg_setup;
+	u32 flags = 0;
+	u8 clk_gate_flags = 0;
+	struct ti_clk_gate *gate;
+
+	gate = setup->data;
+
+	if (gate->flags & CLKF_INTERFACE)
+		return ti_clk_register_interface(setup);
+
+	reg_setup = (struct clk_omap_reg *)&reg;
+
+	if (gate->flags & CLKF_SET_RATE_PARENT)
+		flags |= CLK_SET_RATE_PARENT;
+
+	if (gate->flags & CLKF_SET_BIT_TO_DISABLE)
+		clk_gate_flags |= INVERT_ENABLE;
+
+	if (gate->flags & CLKF_HSDIV) {
+		ops = &omap_gate_clk_hsdiv_restore_ops;
+		hw_ops = &clkhwops_wait;
+	}
+
+	if (gate->flags & CLKF_DSS)
+		hw_ops = &clkhwops_omap3430es2_dss_usbhost_wait;
+
+	if (gate->flags & CLKF_WAIT)
+		hw_ops = &clkhwops_wait;
+
+	if (gate->flags & CLKF_CLKDM)
+		ops = &omap_gate_clkdm_clk_ops;
+
+	if (gate->flags & CLKF_AM35XX)
+		hw_ops = &clkhwops_am35xx_ipss_module_wait;
+
+	reg_setup->index = gate->module;
+	reg_setup->offset = gate->reg;
+
+	return _register_gate(NULL, setup->name, gate->parent, flags,
+			      (void __iomem *)reg, gate->bit_shift,
+			      clk_gate_flags, ops, hw_ops);
+}
+
+struct clk_hw *ti_clk_build_component_gate(struct ti_clk_gate *setup)
+{
+	struct clk_hw_omap *gate;
+	struct clk_omap_reg *reg;
+	const struct clk_hw_omap_ops *ops = &clkhwops_wait;
+
+	if (!setup)
+		return NULL;
+
+	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+	if (!gate)
+		return ERR_PTR(-ENOMEM);
+
+	reg = (struct clk_omap_reg *)&gate->enable_reg;
+	reg->index = setup->module;
+	reg->offset = setup->reg;
+
+	gate->enable_bit = setup->bit_shift;
+
+	if (setup->flags & CLKF_NO_WAIT)
+		ops = NULL;
+
+	if (setup->flags & CLKF_INTERFACE)
+		ops = &clkhwops_iclk_wait;
+
+	gate->ops = ops;
+	gate->flags = MEMMAP_ADDRESSING;
+
+	return &gate->hw;
+}
+#endif
+
+static void __init _of_ti_gate_clk_setup(struct device_node *node,
+					 const struct clk_ops *ops,
+					 const struct clk_hw_omap_ops *hw_ops)
+{
+	struct clk *clk;
+	const char *parent_name;
+	void __iomem *reg = NULL;
+	u8 enable_bit = 0;
+	u32 val;
+	u32 flags = 0;
+	u8 clk_gate_flags = 0;
+
+	if (ops != &omap_gate_clkdm_clk_ops) {
+		reg = ti_clk_get_reg_addr(node, 0);
+		if (IS_ERR(reg))
+			return;
+
+		if (!of_property_read_u32(node, "ti,bit-shift", &val))
+			enable_bit = val;
+	}
+
+	if (of_clk_get_parent_count(node) != 1) {
+		pr_err("%s must have 1 parent\n", node->name);
+		return;
+	}
+
+	parent_name = of_clk_get_parent_name(node, 0);
+
+	if (of_property_read_bool(node, "ti,set-rate-parent"))
+		flags |= CLK_SET_RATE_PARENT;
+
+	if (of_property_read_bool(node, "ti,set-bit-to-disable"))
+		clk_gate_flags |= INVERT_ENABLE;
+
+	clk = _register_gate(NULL, node->name, parent_name, flags, reg,
+			     enable_bit, clk_gate_flags, ops, hw_ops);
+
+	if (!IS_ERR(clk))
+		of_clk_add_provider(node, of_clk_src_simple_get, clk);
+}
+
+static void __init
+_of_ti_composite_gate_clk_setup(struct device_node *node,
+				const struct clk_hw_omap_ops *hw_ops)
+{
+	struct clk_hw_omap *gate;
+	u32 val = 0;
+
+	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+	if (!gate)
+		return;
+
+	gate->enable_reg = ti_clk_get_reg_addr(node, 0);
+	if (IS_ERR(gate->enable_reg))
+		goto cleanup;
+
+	of_property_read_u32(node, "ti,bit-shift", &val);
+
+	gate->enable_bit = val;
+	gate->ops = hw_ops;
+	gate->flags = MEMMAP_ADDRESSING;
+
+	if (!ti_clk_add_component(node, &gate->hw, CLK_COMPONENT_TYPE_GATE))
+		return;
+
+cleanup:
+	kfree(gate);
+}
+
+static void __init
+of_ti_composite_no_wait_gate_clk_setup(struct device_node *node)
+{
+	_of_ti_composite_gate_clk_setup(node, NULL);
+}
+CLK_OF_DECLARE(ti_composite_no_wait_gate_clk, "ti,composite-no-wait-gate-clock",
+	       of_ti_composite_no_wait_gate_clk_setup);
+
+#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
+static void __init of_ti_composite_interface_clk_setup(struct device_node *node)
+{
+	_of_ti_composite_gate_clk_setup(node, &clkhwops_iclk_wait);
+}
+CLK_OF_DECLARE(ti_composite_interface_clk, "ti,composite-interface-clock",
+	       of_ti_composite_interface_clk_setup);
+#endif
+
+static void __init of_ti_composite_gate_clk_setup(struct device_node *node)
+{
+	_of_ti_composite_gate_clk_setup(node, &clkhwops_wait);
+}
+CLK_OF_DECLARE(ti_composite_gate_clk, "ti,composite-gate-clock",
+	       of_ti_composite_gate_clk_setup);
+
+
+static void __init of_ti_clkdm_gate_clk_setup(struct device_node *node)
+{
+	_of_ti_gate_clk_setup(node, &omap_gate_clkdm_clk_ops, NULL);
+}
+CLK_OF_DECLARE(ti_clkdm_gate_clk, "ti,clkdm-gate-clock",
+	       of_ti_clkdm_gate_clk_setup);
+
+static void __init of_ti_hsdiv_gate_clk_setup(struct device_node *node)
+{
+	_of_ti_gate_clk_setup(node, &omap_gate_clk_hsdiv_restore_ops,
+			      &clkhwops_wait);
+}
+CLK_OF_DECLARE(ti_hsdiv_gate_clk, "ti,hsdiv-gate-clock",
+	       of_ti_hsdiv_gate_clk_setup);
+
+static void __init of_ti_gate_clk_setup(struct device_node *node)
+{
+	_of_ti_gate_clk_setup(node, &omap_gate_clk_ops, NULL);
+}
+CLK_OF_DECLARE(ti_gate_clk, "ti,gate-clock", of_ti_gate_clk_setup);
+
+static void __init of_ti_wait_gate_clk_setup(struct device_node *node)
+{
+	_of_ti_gate_clk_setup(node, &omap_gate_clk_ops, &clkhwops_wait);
+}
+CLK_OF_DECLARE(ti_wait_gate_clk, "ti,wait-gate-clock",
+	       of_ti_wait_gate_clk_setup);
+
+#ifdef CONFIG_ARCH_OMAP3
+static void __init of_ti_am35xx_gate_clk_setup(struct device_node *node)
+{
+	_of_ti_gate_clk_setup(node, &omap_gate_clk_ops,
+			      &clkhwops_am35xx_ipss_module_wait);
+}
+CLK_OF_DECLARE(ti_am35xx_gate_clk, "ti,am35xx-gate-clock",
+	       of_ti_am35xx_gate_clk_setup);
+
+static void __init of_ti_dss_gate_clk_setup(struct device_node *node)
+{
+	_of_ti_gate_clk_setup(node, &omap_gate_clk_ops,
+			      &clkhwops_omap3430es2_dss_usbhost_wait);
+}
+CLK_OF_DECLARE(ti_dss_gate_clk, "ti,dss-gate-clock",
+	       of_ti_dss_gate_clk_setup);
+#endif