1 files changed, 210 insertions, 89 deletions

diff --git a/drivers/clk/ti/clkctrl.c b/drivers/clk/ti/clkctrl.c
index 40630eb950fc..607e34d8e289 100644
--- a/drivers/clk/ti/clkctrl.c
+++ b/drivers/clk/ti/clkctrl.c
@@ -1,18 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * OMAP clkctrl clock support
  *
  * Copyright (C) 2017 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>
@@ -21,10 +13,11 @@
 #include <linux/of_address.h>
 #include <linux/clk/ti.h>
 #include <linux/delay.h>
+#include <linux/string_helpers.h>
 #include <linux/timekeeping.h>
 #include "clock.h"
 
-#define NO_IDLEST			0x1
+#define NO_IDLEST			0
 
 #define OMAP4_MODULEMODE_MASK		0x3
 
@@ -34,6 +27,9 @@
 #define OMAP4_IDLEST_MASK		(0x3 << 16)
 #define OMAP4_IDLEST_SHIFT		16
 
+#define OMAP4_STBYST_MASK		BIT(18)
+#define OMAP4_STBYST_SHIFT		18
+
 #define CLKCTRL_IDLEST_FUNCTIONAL	0x0
 #define CLKCTRL_IDLEST_INTERFACE_IDLE	0x2
 #define CLKCTRL_IDLEST_DISABLED		0x3
@@ -100,11 +96,12 @@ static bool _omap4_is_timeout(union omap4_timeout *time, u32 timeout)
 	 * can be from a timer that requires pm_runtime access, which
 	 * will eventually bring us here with timekeeping_suspended,
 	 * during both suspend entry and resume paths. This happens
-	 * at least on am43xx platform.
+	 * at least on am43xx platform. Account for flakeyness
+	 * with udelay() by multiplying the timeout value by 2.
 	 */
 	if (unlikely(_early_timeout || timekeeping_suspended)) {
 		if (time->cycles++ < timeout) {
-			udelay(1);
+			udelay(1 * 2);
 			return false;
 		}
 	} else {
@@ -137,9 +134,6 @@ static int _omap4_clkctrl_clk_enable(struct clk_hw *hw)
 	int ret;
 	union omap4_timeout timeout = { 0 };
 
-	if (!clk->enable_bit)
-		return 0;
-
 	if (clk->clkdm) {
 		ret = ti_clk_ll_ops->clkdm_clk_enable(clk->clkdm, hw->clk);
 		if (ret) {
@@ -151,6 +145,9 @@ static int _omap4_clkctrl_clk_enable(struct clk_hw *hw)
 		}
 	}
 
+	if (!clk->enable_bit)
+		return 0;
+
 	val = ti_clk_ll_ops->clk_readl(&clk->enable_reg);
 
 	val &= ~OMAP4_MODULEMODE_MASK;
@@ -158,7 +155,7 @@ static int _omap4_clkctrl_clk_enable(struct clk_hw *hw)
 
 	ti_clk_ll_ops->clk_writel(val, &clk->enable_reg);
 
-	if (clk->flags & NO_IDLEST)
+	if (test_bit(NO_IDLEST, &clk->flags))
 		return 0;
 
 	/* Wait until module is enabled */
@@ -179,7 +176,7 @@ static void _omap4_clkctrl_clk_disable(struct clk_hw *hw)
 	union omap4_timeout timeout = { 0 };
 
 	if (!clk->enable_bit)
-		return;
+		goto exit;
 
 	val = ti_clk_ll_ops->clk_readl(&clk->enable_reg);
 
@@ -187,7 +184,7 @@ static void _omap4_clkctrl_clk_disable(struct clk_hw *hw)
 
 	ti_clk_ll_ops->clk_writel(val, &clk->enable_reg);
 
-	if (clk->flags & NO_IDLEST)
+	if (test_bit(NO_IDLEST, &clk->flags))
 		goto exit;
 
 	/* Wait until module is disabled */
@@ -228,7 +225,7 @@ static struct clk_hw *_ti_omap4_clkctrl_xlate(struct of_phandle_args *clkspec,
 					      void *data)
 {
 	struct omap_clkctrl_provider *provider = data;
-	struct omap_clkctrl_clk *entry;
+	struct omap_clkctrl_clk *entry = NULL, *iter;
 
 	if (clkspec->args_count != 2)
 		return ERR_PTR(-EINVAL);
@@ -236,10 +233,12 @@ static struct clk_hw *_ti_omap4_clkctrl_xlate(struct of_phandle_args *clkspec,
 	pr_debug("%s: looking for %x:%x\n", __func__,
 		 clkspec->args[0], clkspec->args[1]);
 
-	list_for_each_entry(entry, &provider->clocks, node) {
-		if (entry->reg_offset == clkspec->args[0] &&
-		    entry->bit_offset == clkspec->args[1])
+	list_for_each_entry(iter, &provider->clocks, node) {
+		if (iter->reg_offset == clkspec->args[0] &&
+		    iter->bit_offset == clkspec->args[1]) {
+			entry = iter;
 			break;
+		}
 	}
 
 	if (!entry)
@@ -248,24 +247,56 @@ static struct clk_hw *_ti_omap4_clkctrl_xlate(struct of_phandle_args *clkspec,
 	return entry->clk;
 }
 
+/* Get clkctrl clock base name based on clkctrl_name or dts node */
+static const char * __init clkctrl_get_clock_name(struct device_node *np,
+						  const char *clkctrl_name,
+						  int offset, int index,
+						  bool legacy_naming)
+{
+	char *clock_name;
+
+	/* l4per-clkctrl:1234:0 style naming based on clkctrl_name */
+	if (clkctrl_name && !legacy_naming) {
+		clock_name = kasprintf(GFP_KERNEL, "%s-clkctrl:%04x:%d",
+				       clkctrl_name, offset, index);
+		if (!clock_name)
+			return NULL;
+
+		strreplace(clock_name, '_', '-');
+
+		return clock_name;
+	}
+
+	/* l4per:1234:0 old style naming based on clkctrl_name */
+	if (clkctrl_name)
+		return kasprintf(GFP_KERNEL, "%s_cm:clk:%04x:%d",
+				 clkctrl_name, offset, index);
+
+	/* l4per_cm:1234:0 old style naming based on parent node name */
+	if (legacy_naming)
+		return kasprintf(GFP_KERNEL, "%pOFn:clk:%04x:%d",
+				 np->parent, offset, index);
+
+	/* l4per-clkctrl:1234:0 style naming based on node name */
+	return kasprintf(GFP_KERNEL, "%pOFn:%04x:%d", np, offset, index);
+}
+
 static int __init
 _ti_clkctrl_clk_register(struct omap_clkctrl_provider *provider,
 			 struct device_node *node, struct clk_hw *clk_hw,
 			 u16 offset, u8 bit, const char * const *parents,
-			 int num_parents, const struct clk_ops *ops)
+			 int num_parents, const struct clk_ops *ops,
+			 const char *clkctrl_name)
 {
 	struct clk_init_data init = { NULL };
 	struct clk *clk;
 	struct omap_clkctrl_clk *clkctrl_clk;
 	int ret = 0;
 
-	if (ti_clk_get_features()->flags & TI_CLK_CLKCTRL_COMPAT)
-		init.name = kasprintf(GFP_KERNEL, "%pOFn:%pOFn:%04x:%d",
-				      node->parent, node, offset,
-				      bit);
-	else
-		init.name = kasprintf(GFP_KERNEL, "%pOFn:%04x:%d", node,
-				      offset, bit);
+	init.name = clkctrl_get_clock_name(node, clkctrl_name, offset, bit,
+					   ti_clk_get_features()->flags &
+					   TI_CLK_CLKCTRL_COMPAT);
+
 	clkctrl_clk = kzalloc(sizeof(*clkctrl_clk), GFP_KERNEL);
 	if (!init.name || !clkctrl_clk) {
 		ret = -ENOMEM;
@@ -276,9 +307,9 @@ _ti_clkctrl_clk_register(struct omap_clkctrl_provider *provider,
 	init.parent_names = parents;
 	init.num_parents = num_parents;
 	init.ops = ops;
-	init.flags = CLK_IS_BASIC;
+	init.flags = 0;
 
-	clk = ti_clk_register(NULL, clk_hw, init.name);
+	clk = of_ti_clk_register(node, clk_hw, init.name);
 	if (IS_ERR_OR_NULL(clk)) {
 		ret = -EINVAL;
 		goto cleanup;
@@ -302,7 +333,7 @@ static void __init
 _ti_clkctrl_setup_gate(struct omap_clkctrl_provider *provider,
 		       struct device_node *node, u16 offset,
 		       const struct omap_clkctrl_bit_data *data,
-		       void __iomem *reg)
+		       void __iomem *reg, const char *clkctrl_name)
 {
 	struct clk_hw_omap *clk_hw;
 
@@ -315,7 +346,7 @@ _ti_clkctrl_setup_gate(struct omap_clkctrl_provider *provider,
 
 	if (_ti_clkctrl_clk_register(provider, node, &clk_hw->hw, offset,
 				     data->bit, data->parents, 1,
-				     &omap_gate_clk_ops))
+				     &omap_gate_clk_ops, clkctrl_name))
 		kfree(clk_hw);
 }
 
@@ -323,7 +354,7 @@ static void __init
 _ti_clkctrl_setup_mux(struct omap_clkctrl_provider *provider,
 		      struct device_node *node, u16 offset,
 		      const struct omap_clkctrl_bit_data *data,
-		      void __iomem *reg)
+		      void __iomem *reg, const char *clkctrl_name)
 {
 	struct clk_omap_mux *mux;
 	int num_parents = 0;
@@ -350,7 +381,7 @@ _ti_clkctrl_setup_mux(struct omap_clkctrl_provider *provider,
 
 	if (_ti_clkctrl_clk_register(provider, node, &mux->hw, offset,
 				     data->bit, data->parents, num_parents,
-				     &ti_clk_mux_ops))
+				     &ti_clk_mux_ops, clkctrl_name))
 		kfree(mux);
 }
 
@@ -358,7 +389,7 @@ static void __init
 _ti_clkctrl_setup_div(struct omap_clkctrl_provider *provider,
 		      struct device_node *node, u16 offset,
 		      const struct omap_clkctrl_bit_data *data,
-		      void __iomem *reg)
+		      void __iomem *reg, const char *clkctrl_name)
 {
 	struct clk_omap_divider *div;
 	const struct omap_clkctrl_div_data *div_data = data->data;
@@ -377,7 +408,7 @@ _ti_clkctrl_setup_div(struct omap_clkctrl_provider *provider,
 
 	if (ti_clk_parse_divider_data((int *)div_data->dividers, 0,
 				      div_data->max_div, div_flags,
-				      &div->width, &div->table)) {
+				      div)) {
 		pr_err("%s: Data parsing for %pOF:%04x:%d failed\n", __func__,
 		       node, offset, data->bit);
 		kfree(div);
@@ -386,7 +417,7 @@ _ti_clkctrl_setup_div(struct omap_clkctrl_provider *provider,
 
 	if (_ti_clkctrl_clk_register(provider, node, &div->hw, offset,
 				     data->bit, data->parents, 1,
-				     &ti_clk_divider_ops))
+				     &ti_clk_divider_ops, clkctrl_name))
 		kfree(div);
 }
 
@@ -394,7 +425,7 @@ static void __init
 _ti_clkctrl_setup_subclks(struct omap_clkctrl_provider *provider,
 			  struct device_node *node,
 			  const struct omap_clkctrl_reg_data *data,
-			  void __iomem *reg)
+			  void __iomem *reg, const char *clkctrl_name)
 {
 	const struct omap_clkctrl_bit_data *bits = data->bit_data;
 
@@ -405,17 +436,17 @@ _ti_clkctrl_setup_subclks(struct omap_clkctrl_provider *provider,
 		switch (bits->type) {
 		case TI_CLK_GATE:
 			_ti_clkctrl_setup_gate(provider, node, data->offset,
-					       bits, reg);
+					       bits, reg, clkctrl_name);
 			break;
 
 		case TI_CLK_DIVIDER:
 			_ti_clkctrl_setup_div(provider, node, data->offset,
-					      bits, reg);
+					      bits, reg, clkctrl_name);
 			break;
 
 		case TI_CLK_MUX:
 			_ti_clkctrl_setup_mux(provider, node, data->offset,
-					      bits, reg);
+					      bits, reg, clkctrl_name);
 			break;
 
 		default:
@@ -433,6 +464,49 @@ static void __init _clkctrl_add_provider(void *data,
 	of_clk_add_hw_provider(np, _ti_omap4_clkctrl_xlate, data);
 }
 
+/*
+ * Get clock name based on "clock-output-names" property or the
+ * compatible property for clkctrl.
+ */
+static const char * __init clkctrl_get_name(struct device_node *np)
+{
+	struct property *prop;
+	const int prefix_len = 11;
+	const char *compat;
+	const char *output;
+	const char *end;
+	char *name;
+
+	if (!of_property_read_string_index(np, "clock-output-names", 0,
+					   &output)) {
+		int len;
+
+		len = strlen(output);
+		end = strstr(output, "_clkctrl");
+		if (end)
+			len -= strlen(end);
+		name = kstrndup(output, len, GFP_KERNEL);
+
+		return name;
+	}
+
+	of_property_for_each_string(np, "compatible", prop, compat) {
+		if (!strncmp("ti,clkctrl-", compat, prefix_len)) {
+			end = compat + prefix_len;
+			/* Two letter minimum name length for l3, l4 etc */
+			if (strnlen(end, 16) < 2)
+				continue;
+			name = kstrdup_and_replace(end, '-', '_', GFP_KERNEL);
+			if (!name)
+				continue;
+
+			return name;
+		}
+	}
+
+	return NULL;
+}
+
 static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
 {
 	struct omap_clkctrl_provider *provider;
@@ -441,18 +515,17 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
 	struct clk_init_data init = { NULL };
 	struct clk_hw_omap *hw;
 	struct clk *clk;
-	struct omap_clkctrl_clk *clkctrl_clk;
-	const __be32 *addrp;
+	struct omap_clkctrl_clk *clkctrl_clk = NULL;
+	bool legacy_naming;
+	const char *clkctrl_name;
 	u32 addr;
 	int ret;
 	char *c;
+	u16 soc_mask = 0;
+	struct resource res;
 
-	if (!(ti_clk_get_features()->flags & TI_CLK_CLKCTRL_COMPAT) &&
-	    of_node_name_eq(node, "clk"))
-		ti_clk_features.flags |= TI_CLK_CLKCTRL_COMPAT;
-
-	addrp = of_get_address(node, 0, NULL, NULL);
-	addr = (u32)of_translate_address(node, addrp);
+	of_address_to_resource(node, 0, &res);
+	addr = (u32)res.start;
 
 #ifdef CONFIG_ARCH_OMAP4
 	if (of_machine_is_compatible("ti,omap4"))
@@ -463,35 +536,25 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
 		data = omap5_clkctrl_data;
 #endif
 #ifdef CONFIG_SOC_DRA7XX
-	if (of_machine_is_compatible("ti,dra7")) {
-		if (ti_clk_get_features()->flags & TI_CLK_CLKCTRL_COMPAT)
-			data = dra7_clkctrl_compat_data;
-		else
-			data = dra7_clkctrl_data;
-	}
+	if (of_machine_is_compatible("ti,dra7"))
+		data = dra7_clkctrl_data;
+	if (of_machine_is_compatible("ti,dra72"))
+		soc_mask = CLKF_SOC_DRA72;
+	if (of_machine_is_compatible("ti,dra74"))
+		soc_mask = CLKF_SOC_DRA74;
+	if (of_machine_is_compatible("ti,dra76"))
+		soc_mask = CLKF_SOC_DRA76;
 #endif
 #ifdef CONFIG_SOC_AM33XX
-	if (of_machine_is_compatible("ti,am33xx")) {
-		if (ti_clk_get_features()->flags & TI_CLK_CLKCTRL_COMPAT)
-			data = am3_clkctrl_compat_data;
-		else
-			data = am3_clkctrl_data;
-	}
+	if (of_machine_is_compatible("ti,am33xx"))
+		data = am3_clkctrl_data;
 #endif
 #ifdef CONFIG_SOC_AM43XX
-	if (of_machine_is_compatible("ti,am4372")) {
-		if (ti_clk_get_features()->flags & TI_CLK_CLKCTRL_COMPAT)
-			data = am4_clkctrl_compat_data;
-		else
-			data = am4_clkctrl_data;
-	}
+	if (of_machine_is_compatible("ti,am4372"))
+		data = am4_clkctrl_data;
 
-	if (of_machine_is_compatible("ti,am438x")) {
-		if (ti_clk_get_features()->flags & TI_CLK_CLKCTRL_COMPAT)
-			data = am438x_clkctrl_compat_data;
-		else
-			data = am438x_clkctrl_data;
-	}
+	if (of_machine_is_compatible("ti,am438x"))
+		data = am438x_clkctrl_data;
 #endif
 #ifdef CONFIG_SOC_TI81XX
 	if (of_machine_is_compatible("ti,dm814"))
@@ -501,6 +564,9 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
 		data = dm816_clkctrl_data;
 #endif
 
+	if (ti_clk_get_features()->flags & TI_CLK_DEVICE_TYPE_GP)
+		soc_mask |= CLKF_SOC_NONSEC;
+
 	while (data->addr) {
 		if (addr == data->addr)
 			break;
@@ -519,7 +585,23 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
 
 	provider->base = of_iomap(node, 0);
 
-	if (ti_clk_get_features()->flags & TI_CLK_CLKCTRL_COMPAT) {
+	legacy_naming = ti_clk_get_features()->flags & TI_CLK_CLKCTRL_COMPAT;
+	clkctrl_name = clkctrl_get_name(node);
+	if (clkctrl_name) {
+		provider->clkdm_name = kasprintf(GFP_KERNEL,
+						 "%s_clkdm", clkctrl_name);
+		if (!provider->clkdm_name) {
+			kfree(provider);
+			return;
+		}
+		goto clkdm_found;
+	}
+
+	/*
+	 * The code below can be removed when all clkctrl nodes use domain
+	 * specific compatible property and standard clock node naming
+	 */
+	if (legacy_naming) {
 		provider->clkdm_name = kasprintf(GFP_KERNEL, "%pOFnxxx", node->parent);
 		if (!provider->clkdm_name) {
 			kfree(provider);
@@ -530,7 +612,7 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
 		 * Create default clkdm name, replace _cm from end of parent
 		 * node name with _clkdm
 		 */
-		provider->clkdm_name[strlen(provider->clkdm_name) - 5] = 0;
+		provider->clkdm_name[strlen(provider->clkdm_name) - 2] = 0;
 	} else {
 		provider->clkdm_name = kasprintf(GFP_KERNEL, "%pOFn", node);
 		if (!provider->clkdm_name) {
@@ -555,13 +637,19 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
 			*c = '_';
 		c++;
 	}
-
+clkdm_found:
 	INIT_LIST_HEAD(&provider->clocks);
 
 	/* Generate clocks */
 	reg_data = data->regs;
 
 	while (reg_data->parent) {
+		if ((reg_data->flags & CLKF_SOC_MASK) &&
+		    (reg_data->flags & soc_mask) == 0) {
+			reg_data++;
+			continue;
+		}
+
 		hw = kzalloc(sizeof(*hw), GFP_KERNEL);
 		if (!hw)
 			return;
@@ -569,14 +657,14 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
 		hw->enable_reg.ptr = provider->base + reg_data->offset;
 
 		_ti_clkctrl_setup_subclks(provider, node, reg_data,
-					  hw->enable_reg.ptr);
+					  hw->enable_reg.ptr, clkctrl_name);
 
 		if (reg_data->flags & CLKF_SW_SUP)
 			hw->enable_bit = MODULEMODE_SWCTRL;
 		if (reg_data->flags & CLKF_HW_SUP)
 			hw->enable_bit = MODULEMODE_HWCTRL;
 		if (reg_data->flags & CLKF_NO_IDLEST)
-			hw->flags |= NO_IDLEST;
+			set_bit(NO_IDLEST, &hw->flags);
 
 		if (reg_data->clkdm_name)
 			hw->clkdm_name = reg_data->clkdm_name;
@@ -588,21 +676,21 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
 		init.flags = 0;
 		if (reg_data->flags & CLKF_SET_RATE_PARENT)
 			init.flags |= CLK_SET_RATE_PARENT;
-		if (ti_clk_get_features()->flags & TI_CLK_CLKCTRL_COMPAT)
-			init.name = kasprintf(GFP_KERNEL, "%pOFn:%pOFn:%04x:%d",
-					      node->parent, node,
-					      reg_data->offset, 0);
-		else
-			init.name = kasprintf(GFP_KERNEL, "%pOFn:%04x:%d",
-					      node, reg_data->offset, 0);
+
+		init.name = clkctrl_get_clock_name(node, clkctrl_name,
+						   reg_data->offset, 0,
+						   legacy_naming);
+		if (!init.name)
+			goto cleanup;
+
 		clkctrl_clk = kzalloc(sizeof(*clkctrl_clk), GFP_KERNEL);
-		if (!init.name || !clkctrl_clk)
+		if (!clkctrl_clk)
 			goto cleanup;
 
 		init.ops = &omap4_clkctrl_clk_ops;
 		hw->hw.init = &init;
 
-		clk = ti_clk_register(NULL, &hw->hw, init.name);
+		clk = of_ti_clk_register_omap_hw(node, &hw->hw, init.name);
 		if (IS_ERR_OR_NULL(clk))
 			goto cleanup;
 
@@ -618,12 +706,45 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
 	if (ret == -EPROBE_DEFER)
 		ti_clk_retry_init(node, provider, _clkctrl_add_provider);
 
+	kfree(clkctrl_name);
+
 	return;
 
 cleanup:
 	kfree(hw);
 	kfree(init.name);
+	kfree(clkctrl_name);
 	kfree(clkctrl_clk);
 }
 CLK_OF_DECLARE(ti_omap4_clkctrl_clock, "ti,clkctrl",
 	       _ti_omap4_clkctrl_setup);
+
+/**
+ * ti_clk_is_in_standby - Check if clkctrl clock is in standby or not
+ * @clk: clock to check standby status for
+ *
+ * Finds whether the provided clock is in standby mode or not. Returns
+ * true if the provided clock is a clkctrl type clock and it is in standby,
+ * false otherwise.
+ */
+bool ti_clk_is_in_standby(struct clk *clk)
+{
+	struct clk_hw *hw;
+	struct clk_hw_omap *hwclk;
+	u32 val;
+
+	hw = __clk_get_hw(clk);
+
+	if (!omap2_clk_is_hw_omap(hw))
+		return false;
+
+	hwclk = to_clk_hw_omap(hw);
+
+	val = ti_clk_ll_ops->clk_readl(&hwclk->enable_reg);
+
+	if (val & OMAP4_STBYST_MASK)
+		return true;
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(ti_clk_is_in_standby);