clk: renesas: move drivers to renesas directory

This is part of an ongoing process to migrate from ARCH_SHMOBILE to
ARCH_RENESAS the motivation for which being that RENESAS seems to be a more
appropriate name than SHMOBILE for the majority of Renesas ARM based SoCs.

Along with the above mentioned Kconfig changes it seems appropriate
to also rename directories that only hold drivers for such SoCs.

Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

1 files changed, 601 insertions, 0 deletions

diff --git a/drivers/clk/renesas/renesas-cpg-mssr.c b/drivers/clk/renesas/renesas-cpg-mssr.c
new file mode 100644
index 000000000000..58e24b326a48
--- /dev/null
+++ b/drivers/clk/renesas/renesas-cpg-mssr.c
@@ -0,0 +1,601 @@
+/*
+ * Renesas Clock Pulse Generator / Module Standby and Software Reset
+ *
+ * Copyright (C) 2015 Glider bvba
+ *
+ * Based on clk-mstp.c, clk-rcar-gen2.c, and clk-rcar-gen3.c
+ *
+ * Copyright (C) 2013 Ideas On Board SPRL
+ * Copyright (C) 2015 Renesas Electronics Corp.
+ *
+ * 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; version 2 of the License.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_clock.h>
+#include <linux/pm_domain.h>
+#include <linux/slab.h>
+
+#include <dt-bindings/clock/renesas-cpg-mssr.h>
+
+#include "renesas-cpg-mssr.h"
+#include "clk-div6.h"
+
+#ifdef DEBUG
+#define WARN_DEBUG(x)	do { } while (0)
+#else
+#define WARN_DEBUG(x)	WARN_ON(x)
+#endif
+
+
+/*
+ * Module Standby and Software Reset register offets.
+ *
+ * If the registers exist, these are valid for SH-Mobile, R-Mobile,
+ * R-Car Gen 2, and R-Car Gen 3.
+ * These are NOT valid for R-Car Gen1 and RZ/A1!
+ */
+
+/*
+ * Module Stop Status Register offsets
+ */
+
+static const u16 mstpsr[] = {
+	0x030, 0x038, 0x040, 0x048, 0x04C, 0x03C, 0x1C0, 0x1C4,
+	0x9A0, 0x9A4, 0x9A8, 0x9AC,
+};
+
+#define	MSTPSR(i)	mstpsr[i]
+
+
+/*
+ * System Module Stop Control Register offsets
+ */
+
+static const u16 smstpcr[] = {
+	0x130, 0x134, 0x138, 0x13C, 0x140, 0x144, 0x148, 0x14C,
+	0x990, 0x994, 0x998, 0x99C,
+};
+
+#define	SMSTPCR(i)	smstpcr[i]
+
+
+/*
+ * Software Reset Register offsets
+ */
+
+static const u16 srcr[] = {
+	0x0A0, 0x0A8, 0x0B0, 0x0B8, 0x0BC, 0x0C4, 0x1C8, 0x1CC,
+	0x920, 0x924, 0x928, 0x92C,
+};
+
+#define	SRCR(i)		srcr[i]
+
+
+/* Realtime Module Stop Control Register offsets */
+#define RMSTPCR(i)	(smstpcr[i] - 0x20)
+
+/* Modem Module Stop Control Register offsets (r8a73a4) */
+#define MMSTPCR(i)	(smstpcr[i] + 0x20)
+
+/* Software Reset Clearing Register offsets */
+#define	SRSTCLR(i)	(0x940 + (i) * 4)
+
+
+/**
+ * Clock Pulse Generator / Module Standby and Software Reset Private Data
+ *
+ * @dev: CPG/MSSR device
+ * @base: CPG/MSSR register block base address
+ * @mstp_lock: protects writes to SMSTPCR
+ * @clks: Array containing all Core and Module Clocks
+ * @num_core_clks: Number of Core Clocks in clks[]
+ * @num_mod_clks: Number of Module Clocks in clks[]
+ * @last_dt_core_clk: ID of the last Core Clock exported to DT
+ */
+struct cpg_mssr_priv {
+	struct device *dev;
+	void __iomem *base;
+	spinlock_t mstp_lock;
+
+	struct clk **clks;
+	unsigned int num_core_clks;
+	unsigned int num_mod_clks;
+	unsigned int last_dt_core_clk;
+};
+
+
+/**
+ * struct mstp_clock - MSTP gating clock
+ * @hw: handle between common and hardware-specific interfaces
+ * @index: MSTP clock number
+ * @priv: CPG/MSSR private data
+ */
+struct mstp_clock {
+	struct clk_hw hw;
+	u32 index;
+	struct cpg_mssr_priv *priv;
+};
+
+#define to_mstp_clock(_hw) container_of(_hw, struct mstp_clock, hw)
+
+static int cpg_mstp_clock_endisable(struct clk_hw *hw, bool enable)
+{
+	struct mstp_clock *clock = to_mstp_clock(hw);
+	struct cpg_mssr_priv *priv = clock->priv;
+	unsigned int reg = clock->index / 32;
+	unsigned int bit = clock->index % 32;
+	struct device *dev = priv->dev;
+	u32 bitmask = BIT(bit);
+	unsigned long flags;
+	unsigned int i;
+	u32 value;
+
+	dev_dbg(dev, "MSTP %u%02u/%pC %s\n", reg, bit, hw->clk,
+		enable ? "ON" : "OFF");
+	spin_lock_irqsave(&priv->mstp_lock, flags);
+
+	value = clk_readl(priv->base + SMSTPCR(reg));
+	if (enable)
+		value &= ~bitmask;
+	else
+		value |= bitmask;
+	clk_writel(value, priv->base + SMSTPCR(reg));
+
+	spin_unlock_irqrestore(&priv->mstp_lock, flags);
+
+	if (!enable)
+		return 0;
+
+	for (i = 1000; i > 0; --i) {
+		if (!(clk_readl(priv->base + MSTPSR(reg)) &
+		      bitmask))
+			break;
+		cpu_relax();
+	}
+
+	if (!i) {
+		dev_err(dev, "Failed to enable SMSTP %p[%d]\n",
+			priv->base + SMSTPCR(reg), bit);
+		return -ETIMEDOUT;
+	}
+
+	return 0;
+}
+
+static int cpg_mstp_clock_enable(struct clk_hw *hw)
+{
+	return cpg_mstp_clock_endisable(hw, true);
+}
+
+static void cpg_mstp_clock_disable(struct clk_hw *hw)
+{
+	cpg_mstp_clock_endisable(hw, false);
+}
+
+static int cpg_mstp_clock_is_enabled(struct clk_hw *hw)
+{
+	struct mstp_clock *clock = to_mstp_clock(hw);
+	struct cpg_mssr_priv *priv = clock->priv;
+	u32 value;
+
+	value = clk_readl(priv->base + MSTPSR(clock->index / 32));
+
+	return !(value & BIT(clock->index % 32));
+}
+
+static const struct clk_ops cpg_mstp_clock_ops = {
+	.enable = cpg_mstp_clock_enable,
+	.disable = cpg_mstp_clock_disable,
+	.is_enabled = cpg_mstp_clock_is_enabled,
+};
+
+static
+struct clk *cpg_mssr_clk_src_twocell_get(struct of_phandle_args *clkspec,
+					 void *data)
+{
+	unsigned int clkidx = clkspec->args[1];
+	struct cpg_mssr_priv *priv = data;
+	struct device *dev = priv->dev;
+	unsigned int idx;
+	const char *type;
+	struct clk *clk;
+
+	switch (clkspec->args[0]) {
+	case CPG_CORE:
+		type = "core";
+		if (clkidx > priv->last_dt_core_clk) {
+			dev_err(dev, "Invalid %s clock index %u\n", type,
+			       clkidx);
+			return ERR_PTR(-EINVAL);
+		}
+		clk = priv->clks[clkidx];
+		break;
+
+	case CPG_MOD:
+		type = "module";
+		idx = MOD_CLK_PACK(clkidx);
+		if (clkidx % 100 > 31 || idx >= priv->num_mod_clks) {
+			dev_err(dev, "Invalid %s clock index %u\n", type,
+				clkidx);
+			return ERR_PTR(-EINVAL);
+		}
+		clk = priv->clks[priv->num_core_clks + idx];
+		break;
+
+	default:
+		dev_err(dev, "Invalid CPG clock type %u\n", clkspec->args[0]);
+		return ERR_PTR(-EINVAL);
+	}
+
+	if (IS_ERR(clk))
+		dev_err(dev, "Cannot get %s clock %u: %ld", type, clkidx,
+		       PTR_ERR(clk));
+	else
+		dev_dbg(dev, "clock (%u, %u) is %pC at %pCr Hz\n",
+			clkspec->args[0], clkspec->args[1], clk, clk);
+	return clk;
+}
+
+static void __init cpg_mssr_register_core_clk(const struct cpg_core_clk *core,
+					      const struct cpg_mssr_info *info,
+					      struct cpg_mssr_priv *priv)
+{
+	struct clk *clk = NULL, *parent;
+	struct device *dev = priv->dev;
+	unsigned int id = core->id;
+	const char *parent_name;
+
+	WARN_DEBUG(id >= priv->num_core_clks);
+	WARN_DEBUG(PTR_ERR(priv->clks[id]) != -ENOENT);
+
+	switch (core->type) {
+	case CLK_TYPE_IN:
+		clk = of_clk_get_by_name(priv->dev->of_node, core->name);
+		break;
+
+	case CLK_TYPE_FF:
+	case CLK_TYPE_DIV6P1:
+		WARN_DEBUG(core->parent >= priv->num_core_clks);
+		parent = priv->clks[core->parent];
+		if (IS_ERR(parent)) {
+			clk = parent;
+			goto fail;
+		}
+
+		parent_name = __clk_get_name(parent);
+		if (core->type == CLK_TYPE_FF) {
+			clk = clk_register_fixed_factor(NULL, core->name,
+							parent_name, 0,
+							core->mult, core->div);
+		} else {
+			clk = cpg_div6_register(core->name, 1, &parent_name,
+						priv->base + core->offset);
+		}
+		break;
+
+	default:
+		if (info->cpg_clk_register)
+			clk = info->cpg_clk_register(dev, core, info,
+						     priv->clks, priv->base);
+		else
+			dev_err(dev, "%s has unsupported core clock type %u\n",
+				core->name, core->type);
+		break;
+	}
+
+	if (IS_ERR_OR_NULL(clk))
+		goto fail;
+
+	dev_dbg(dev, "Core clock %pC at %pCr Hz\n", clk, clk);
+	priv->clks[id] = clk;
+	return;
+
+fail:
+	dev_err(dev, "Failed to register %s clock %s: %ld\n", "core,",
+		core->name, PTR_ERR(clk));
+}
+
+static void __init cpg_mssr_register_mod_clk(const struct mssr_mod_clk *mod,
+					     const struct cpg_mssr_info *info,
+					     struct cpg_mssr_priv *priv)
+{
+	struct mstp_clock *clock = NULL;
+	struct device *dev = priv->dev;
+	unsigned int id = mod->id;
+	struct clk_init_data init;
+	struct clk *parent, *clk;
+	const char *parent_name;
+	unsigned int i;
+
+	WARN_DEBUG(id < priv->num_core_clks);
+	WARN_DEBUG(id >= priv->num_core_clks + priv->num_mod_clks);
+	WARN_DEBUG(mod->parent >= priv->num_core_clks + priv->num_mod_clks);
+	WARN_DEBUG(PTR_ERR(priv->clks[id]) != -ENOENT);
+
+	parent = priv->clks[mod->parent];
+	if (IS_ERR(parent)) {
+		clk = parent;
+		goto fail;
+	}
+
+	clock = kzalloc(sizeof(*clock), GFP_KERNEL);
+	if (!clock) {
+		clk = ERR_PTR(-ENOMEM);
+		goto fail;
+	}
+
+	init.name = mod->name;
+	init.ops = &cpg_mstp_clock_ops;
+	init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
+	for (i = 0; i < info->num_crit_mod_clks; i++)
+		if (id == info->crit_mod_clks[i]) {
+#ifdef CLK_ENABLE_HAND_OFF
+			dev_dbg(dev, "MSTP %s setting CLK_ENABLE_HAND_OFF\n",
+				mod->name);
+			init.flags |= CLK_ENABLE_HAND_OFF;
+			break;
+#else
+			dev_dbg(dev, "Ignoring MSTP %s to prevent disabling\n",
+				mod->name);
+			kfree(clock);
+			return;
+#endif
+		}
+
+	parent_name = __clk_get_name(parent);
+	init.parent_names = &parent_name;
+	init.num_parents = 1;
+
+	clock->index = id - priv->num_core_clks;
+	clock->priv = priv;
+	clock->hw.init = &init;
+
+	clk = clk_register(NULL, &clock->hw);
+	if (IS_ERR(clk))
+		goto fail;
+
+	dev_dbg(dev, "Module clock %pC at %pCr Hz\n", clk, clk);
+	priv->clks[id] = clk;
+	return;
+
+fail:
+	dev_err(dev, "Failed to register %s clock %s: %ld\n", "module,",
+		mod->name, PTR_ERR(clk));
+	kfree(clock);
+}
+
+
+#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
+struct cpg_mssr_clk_domain {
+	struct generic_pm_domain genpd;
+	struct device_node *np;
+	unsigned int num_core_pm_clks;
+	unsigned int core_pm_clks[0];
+};
+
+static bool cpg_mssr_is_pm_clk(const struct of_phandle_args *clkspec,
+			       struct cpg_mssr_clk_domain *pd)
+{
+	unsigned int i;
+
+	if (clkspec->np != pd->np || clkspec->args_count != 2)
+		return false;
+
+	switch (clkspec->args[0]) {
+	case CPG_CORE:
+		for (i = 0; i < pd->num_core_pm_clks; i++)
+			if (clkspec->args[1] == pd->core_pm_clks[i])
+				return true;
+		return false;
+
+	case CPG_MOD:
+		return true;
+
+	default:
+		return false;
+	}
+}
+
+static int cpg_mssr_attach_dev(struct generic_pm_domain *genpd,
+			       struct device *dev)
+{
+	struct cpg_mssr_clk_domain *pd =
+		container_of(genpd, struct cpg_mssr_clk_domain, genpd);
+	struct device_node *np = dev->of_node;
+	struct of_phandle_args clkspec;
+	struct clk *clk;
+	int i = 0;
+	int error;
+
+	while (!of_parse_phandle_with_args(np, "clocks", "#clock-cells", i,
+					   &clkspec)) {
+		if (cpg_mssr_is_pm_clk(&clkspec, pd))
+			goto found;
+
+		of_node_put(clkspec.np);
+		i++;
+	}
+
+	return 0;
+
+found:
+	clk = of_clk_get_from_provider(&clkspec);
+	of_node_put(clkspec.np);
+
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	error = pm_clk_create(dev);
+	if (error) {
+		dev_err(dev, "pm_clk_create failed %d\n", error);
+		goto fail_put;
+	}
+
+	error = pm_clk_add_clk(dev, clk);
+	if (error) {
+		dev_err(dev, "pm_clk_add_clk %pC failed %d\n", clk, error);
+		goto fail_destroy;
+	}
+
+	return 0;
+
+fail_destroy:
+	pm_clk_destroy(dev);
+fail_put:
+	clk_put(clk);
+	return error;
+}
+
+static void cpg_mssr_detach_dev(struct generic_pm_domain *genpd,
+				struct device *dev)
+{
+	if (!list_empty(&dev->power.subsys_data->clock_list))
+		pm_clk_destroy(dev);
+}
+
+static int __init cpg_mssr_add_clk_domain(struct device *dev,
+					  const unsigned int *core_pm_clks,
+					  unsigned int num_core_pm_clks)
+{
+	struct device_node *np = dev->of_node;
+	struct generic_pm_domain *genpd;
+	struct cpg_mssr_clk_domain *pd;
+	size_t pm_size = num_core_pm_clks * sizeof(core_pm_clks[0]);
+
+	pd = devm_kzalloc(dev, sizeof(*pd) + pm_size, GFP_KERNEL);
+	if (!pd)
+		return -ENOMEM;
+
+	pd->np = np;
+	pd->num_core_pm_clks = num_core_pm_clks;
+	memcpy(pd->core_pm_clks, core_pm_clks, pm_size);
+
+	genpd = &pd->genpd;
+	genpd->name = np->name;
+	genpd->flags = GENPD_FLAG_PM_CLK;
+	pm_genpd_init(genpd, &simple_qos_governor, false);
+	genpd->attach_dev = cpg_mssr_attach_dev;
+	genpd->detach_dev = cpg_mssr_detach_dev;
+
+	of_genpd_add_provider_simple(np, genpd);
+	return 0;
+}
+#else
+static inline int cpg_mssr_add_clk_domain(struct device *dev,
+					  const unsigned int *core_pm_clks,
+					  unsigned int num_core_pm_clks)
+{
+	return 0;
+}
+#endif /* !CONFIG_PM_GENERIC_DOMAINS_OF */
+
+
+static const struct of_device_id cpg_mssr_match[] = {
+#ifdef CONFIG_ARCH_R8A7795
+	{
+		.compatible = "renesas,r8a7795-cpg-mssr",
+		.data = &r8a7795_cpg_mssr_info,
+	},
+#endif
+	{ /* sentinel */ }
+};
+
+static void cpg_mssr_del_clk_provider(void *data)
+{
+	of_clk_del_provider(data);
+}
+
+static int __init cpg_mssr_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	const struct cpg_mssr_info *info;
+	struct cpg_mssr_priv *priv;
+	unsigned int nclks, i;
+	struct resource *res;
+	struct clk **clks;
+	int error;
+
+	info = of_match_node(cpg_mssr_match, np)->data;
+	if (info->init) {
+		error = info->init(dev);
+		if (error)
+			return error;
+	}
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->dev = dev;
+	spin_lock_init(&priv->mstp_lock);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	priv->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(priv->base))
+		return PTR_ERR(priv->base);
+
+	nclks = info->num_total_core_clks + info->num_hw_mod_clks;
+	clks = devm_kmalloc_array(dev, nclks, sizeof(*clks), GFP_KERNEL);
+	if (!clks)
+		return -ENOMEM;
+
+	priv->clks = clks;
+	priv->num_core_clks = info->num_total_core_clks;
+	priv->num_mod_clks = info->num_hw_mod_clks;
+	priv->last_dt_core_clk = info->last_dt_core_clk;
+
+	for (i = 0; i < nclks; i++)
+		clks[i] = ERR_PTR(-ENOENT);
+
+	for (i = 0; i < info->num_core_clks; i++)
+		cpg_mssr_register_core_clk(&info->core_clks[i], info, priv);
+
+	for (i = 0; i < info->num_mod_clks; i++)
+		cpg_mssr_register_mod_clk(&info->mod_clks[i], info, priv);
+
+	error = of_clk_add_provider(np, cpg_mssr_clk_src_twocell_get, priv);
+	if (error)
+		return error;
+
+	error = devm_add_action_or_reset(dev,
+					 cpg_mssr_del_clk_provider,
+					 np);
+	if (error)
+		return error;
+
+	error = cpg_mssr_add_clk_domain(dev, info->core_pm_clks,
+					info->num_core_pm_clks);
+	if (error)
+		return error;
+
+	return 0;
+}
+
+static struct platform_driver cpg_mssr_driver = {
+	.driver		= {
+		.name	= "renesas-cpg-mssr",
+		.of_match_table = cpg_mssr_match,
+	},
+};
+
+static int __init cpg_mssr_init(void)
+{
+	return platform_driver_probe(&cpg_mssr_driver, cpg_mssr_probe);
+}
+
+subsys_initcall(cpg_mssr_init);
+
+MODULE_DESCRIPTION("Renesas CPG/MSSR Driver");
+MODULE_LICENSE("GPL v2");