1 files changed, 531 insertions, 0 deletions
diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c
new file mode 100644
index 000000000..43ba2a8b0
--- /dev/null
+++ b/drivers/clk/at91/sckc.c
@@ -0,0 +1,531 @@
+/*
+ * drivers/clk/at91/sckc.c
+ *
+ *  Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
+ *
+ * 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.
+ *
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/io.h>
+
+#define SLOW_CLOCK_FREQ		32768
+#define SLOWCK_SW_CYCLES	5
+#define SLOWCK_SW_TIME_USEC	((SLOWCK_SW_CYCLES * USEC_PER_SEC) / \
+				 SLOW_CLOCK_FREQ)
+
+#define	AT91_SCKC_CR			0x00
+#define		AT91_SCKC_RCEN		(1 << 0)
+#define		AT91_SCKC_OSC32EN	(1 << 1)
+#define		AT91_SCKC_OSC32BYP	(1 << 2)
+#define		AT91_SCKC_OSCSEL	(1 << 3)
+
+struct clk_slow_osc {
+	struct clk_hw hw;
+	void __iomem *sckcr;
+	unsigned long startup_usec;
+};
+
+#define to_clk_slow_osc(hw) container_of(hw, struct clk_slow_osc, hw)
+
+struct clk_sama5d4_slow_osc {
+	struct clk_hw hw;
+	void __iomem *sckcr;
+	unsigned long startup_usec;
+	bool prepared;
+};
+
+#define to_clk_sama5d4_slow_osc(hw) container_of(hw, struct clk_sama5d4_slow_osc, hw)
+
+struct clk_slow_rc_osc {
+	struct clk_hw hw;
+	void __iomem *sckcr;
+	unsigned long frequency;
+	unsigned long accuracy;
+	unsigned long startup_usec;
+};
+
+#define to_clk_slow_rc_osc(hw) container_of(hw, struct clk_slow_rc_osc, hw)
+
+struct clk_sam9x5_slow {
+	struct clk_hw hw;
+	void __iomem *sckcr;
+	u8 parent;
+};
+
+#define to_clk_sam9x5_slow(hw) container_of(hw, struct clk_sam9x5_slow, hw)
+
+static int clk_slow_osc_prepare(struct clk_hw *hw)
+{
+	struct clk_slow_osc *osc = to_clk_slow_osc(hw);
+	void __iomem *sckcr = osc->sckcr;
+	u32 tmp = readl(sckcr);
+
+	if (tmp & (AT91_SCKC_OSC32BYP | AT91_SCKC_OSC32EN))
+		return 0;
+
+	writel(tmp | AT91_SCKC_OSC32EN, sckcr);
+
+	if (system_state < SYSTEM_RUNNING)
+		udelay(osc->startup_usec);
+	else
+		usleep_range(osc->startup_usec, osc->startup_usec + 1);
+
+	return 0;
+}
+
+static void clk_slow_osc_unprepare(struct clk_hw *hw)
+{
+	struct clk_slow_osc *osc = to_clk_slow_osc(hw);
+	void __iomem *sckcr = osc->sckcr;
+	u32 tmp = readl(sckcr);
+
+	if (tmp & AT91_SCKC_OSC32BYP)
+		return;
+
+	writel(tmp & ~AT91_SCKC_OSC32EN, sckcr);
+}
+
+static int clk_slow_osc_is_prepared(struct clk_hw *hw)
+{
+	struct clk_slow_osc *osc = to_clk_slow_osc(hw);
+	void __iomem *sckcr = osc->sckcr;
+	u32 tmp = readl(sckcr);
+
+	if (tmp & AT91_SCKC_OSC32BYP)
+		return 1;
+
+	return !!(tmp & AT91_SCKC_OSC32EN);
+}
+
+static const struct clk_ops slow_osc_ops = {
+	.prepare = clk_slow_osc_prepare,
+	.unprepare = clk_slow_osc_unprepare,
+	.is_prepared = clk_slow_osc_is_prepared,
+};
+
+static struct clk_hw * __init
+at91_clk_register_slow_osc(void __iomem *sckcr,
+			   const char *name,
+			   const char *parent_name,
+			   unsigned long startup,
+			   bool bypass)
+{
+	struct clk_slow_osc *osc;
+	struct clk_hw *hw;
+	struct clk_init_data init;
+	int ret;
+
+	if (!sckcr || !name || !parent_name)
+		return ERR_PTR(-EINVAL);
+
+	osc = kzalloc(sizeof(*osc), GFP_KERNEL);
+	if (!osc)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &slow_osc_ops;
+	init.parent_names = &parent_name;
+	init.num_parents = 1;
+	init.flags = CLK_IGNORE_UNUSED;
+
+	osc->hw.init = &init;
+	osc->sckcr = sckcr;
+	osc->startup_usec = startup;
+
+	if (bypass)
+		writel((readl(sckcr) & ~AT91_SCKC_OSC32EN) | AT91_SCKC_OSC32BYP,
+		       sckcr);
+
+	hw = &osc->hw;
+	ret = clk_hw_register(NULL, &osc->hw);
+	if (ret) {
+		kfree(osc);
+		hw = ERR_PTR(ret);
+	}
+
+	return hw;
+}
+
+static void __init
+of_at91sam9x5_clk_slow_osc_setup(struct device_node *np, void __iomem *sckcr)
+{
+	struct clk_hw *hw;
+	const char *parent_name;
+	const char *name = np->name;
+	u32 startup;
+	bool bypass;
+
+	parent_name = of_clk_get_parent_name(np, 0);
+	of_property_read_string(np, "clock-output-names", &name);
+	of_property_read_u32(np, "atmel,startup-time-usec", &startup);
+	bypass = of_property_read_bool(np, "atmel,osc-bypass");
+
+	hw = at91_clk_register_slow_osc(sckcr, name, parent_name, startup,
+					 bypass);
+	if (IS_ERR(hw))
+		return;
+
+	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
+}
+
+static unsigned long clk_slow_rc_osc_recalc_rate(struct clk_hw *hw,
+						 unsigned long parent_rate)
+{
+	struct clk_slow_rc_osc *osc = to_clk_slow_rc_osc(hw);
+
+	return osc->frequency;
+}
+
+static unsigned long clk_slow_rc_osc_recalc_accuracy(struct clk_hw *hw,
+						     unsigned long parent_acc)
+{
+	struct clk_slow_rc_osc *osc = to_clk_slow_rc_osc(hw);
+
+	return osc->accuracy;
+}
+
+static int clk_slow_rc_osc_prepare(struct clk_hw *hw)
+{
+	struct clk_slow_rc_osc *osc = to_clk_slow_rc_osc(hw);
+	void __iomem *sckcr = osc->sckcr;
+
+	writel(readl(sckcr) | AT91_SCKC_RCEN, sckcr);
+
+	if (system_state < SYSTEM_RUNNING)
+		udelay(osc->startup_usec);
+	else
+		usleep_range(osc->startup_usec, osc->startup_usec + 1);
+
+	return 0;
+}
+
+static void clk_slow_rc_osc_unprepare(struct clk_hw *hw)
+{
+	struct clk_slow_rc_osc *osc = to_clk_slow_rc_osc(hw);
+	void __iomem *sckcr = osc->sckcr;
+
+	writel(readl(sckcr) & ~AT91_SCKC_RCEN, sckcr);
+}
+
+static int clk_slow_rc_osc_is_prepared(struct clk_hw *hw)
+{
+	struct clk_slow_rc_osc *osc = to_clk_slow_rc_osc(hw);
+
+	return !!(readl(osc->sckcr) & AT91_SCKC_RCEN);
+}
+
+static const struct clk_ops slow_rc_osc_ops = {
+	.prepare = clk_slow_rc_osc_prepare,
+	.unprepare = clk_slow_rc_osc_unprepare,
+	.is_prepared = clk_slow_rc_osc_is_prepared,
+	.recalc_rate = clk_slow_rc_osc_recalc_rate,
+	.recalc_accuracy = clk_slow_rc_osc_recalc_accuracy,
+};
+
+static struct clk_hw * __init
+at91_clk_register_slow_rc_osc(void __iomem *sckcr,
+			      const char *name,
+			      unsigned long frequency,
+			      unsigned long accuracy,
+			      unsigned long startup)
+{
+	struct clk_slow_rc_osc *osc;
+	struct clk_hw *hw;
+	struct clk_init_data init;
+	int ret;
+
+	if (!sckcr || !name)
+		return ERR_PTR(-EINVAL);
+
+	osc = kzalloc(sizeof(*osc), GFP_KERNEL);
+	if (!osc)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &slow_rc_osc_ops;
+	init.parent_names = NULL;
+	init.num_parents = 0;
+	init.flags = CLK_IGNORE_UNUSED;
+
+	osc->hw.init = &init;
+	osc->sckcr = sckcr;
+	osc->frequency = frequency;
+	osc->accuracy = accuracy;
+	osc->startup_usec = startup;
+
+	hw = &osc->hw;
+	ret = clk_hw_register(NULL, &osc->hw);
+	if (ret) {
+		kfree(osc);
+		hw = ERR_PTR(ret);
+	}
+
+	return hw;
+}
+
+static void __init
+of_at91sam9x5_clk_slow_rc_osc_setup(struct device_node *np, void __iomem *sckcr)
+{
+	struct clk_hw *hw;
+	u32 frequency = 0;
+	u32 accuracy = 0;
+	u32 startup = 0;
+	const char *name = np->name;
+
+	of_property_read_string(np, "clock-output-names", &name);
+	of_property_read_u32(np, "clock-frequency", &frequency);
+	of_property_read_u32(np, "clock-accuracy", &accuracy);
+	of_property_read_u32(np, "atmel,startup-time-usec", &startup);
+
+	hw = at91_clk_register_slow_rc_osc(sckcr, name, frequency, accuracy,
+					    startup);
+	if (IS_ERR(hw))
+		return;
+
+	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
+}
+
+static int clk_sam9x5_slow_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct clk_sam9x5_slow *slowck = to_clk_sam9x5_slow(hw);
+	void __iomem *sckcr = slowck->sckcr;
+	u32 tmp;
+
+	if (index > 1)
+		return -EINVAL;
+
+	tmp = readl(sckcr);
+
+	if ((!index && !(tmp & AT91_SCKC_OSCSEL)) ||
+	    (index && (tmp & AT91_SCKC_OSCSEL)))
+		return 0;
+
+	if (index)
+		tmp |= AT91_SCKC_OSCSEL;
+	else
+		tmp &= ~AT91_SCKC_OSCSEL;
+
+	writel(tmp, sckcr);
+
+	if (system_state < SYSTEM_RUNNING)
+		udelay(SLOWCK_SW_TIME_USEC);
+	else
+		usleep_range(SLOWCK_SW_TIME_USEC, SLOWCK_SW_TIME_USEC + 1);
+
+	return 0;
+}
+
+static u8 clk_sam9x5_slow_get_parent(struct clk_hw *hw)
+{
+	struct clk_sam9x5_slow *slowck = to_clk_sam9x5_slow(hw);
+
+	return !!(readl(slowck->sckcr) & AT91_SCKC_OSCSEL);
+}
+
+static const struct clk_ops sam9x5_slow_ops = {
+	.set_parent = clk_sam9x5_slow_set_parent,
+	.get_parent = clk_sam9x5_slow_get_parent,
+};
+
+static struct clk_hw * __init
+at91_clk_register_sam9x5_slow(void __iomem *sckcr,
+			      const char *name,
+			      const char **parent_names,
+			      int num_parents)
+{
+	struct clk_sam9x5_slow *slowck;
+	struct clk_hw *hw;
+	struct clk_init_data init;
+	int ret;
+
+	if (!sckcr || !name || !parent_names || !num_parents)
+		return ERR_PTR(-EINVAL);
+
+	slowck = kzalloc(sizeof(*slowck), GFP_KERNEL);
+	if (!slowck)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &sam9x5_slow_ops;
+	init.parent_names = parent_names;
+	init.num_parents = num_parents;
+	init.flags = 0;
+
+	slowck->hw.init = &init;
+	slowck->sckcr = sckcr;
+	slowck->parent = !!(readl(sckcr) & AT91_SCKC_OSCSEL);
+
+	hw = &slowck->hw;
+	ret = clk_hw_register(NULL, &slowck->hw);
+	if (ret) {
+		kfree(slowck);
+		hw = ERR_PTR(ret);
+	}
+
+	return hw;
+}
+
+static void __init
+of_at91sam9x5_clk_slow_setup(struct device_node *np, void __iomem *sckcr)
+{
+	struct clk_hw *hw;
+	const char *parent_names[2];
+	unsigned int num_parents;
+	const char *name = np->name;
+
+	num_parents = of_clk_get_parent_count(np);
+	if (num_parents == 0 || num_parents > 2)
+		return;
+
+	of_clk_parent_fill(np, parent_names, num_parents);
+
+	of_property_read_string(np, "clock-output-names", &name);
+
+	hw = at91_clk_register_sam9x5_slow(sckcr, name, parent_names,
+					    num_parents);
+	if (IS_ERR(hw))
+		return;
+
+	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
+}
+
+static const struct of_device_id sckc_clk_ids[] __initconst = {
+	/* Slow clock */
+	{
+		.compatible = "atmel,at91sam9x5-clk-slow-osc",
+		.data = of_at91sam9x5_clk_slow_osc_setup,
+	},
+	{
+		.compatible = "atmel,at91sam9x5-clk-slow-rc-osc",
+		.data = of_at91sam9x5_clk_slow_rc_osc_setup,
+	},
+	{
+		.compatible = "atmel,at91sam9x5-clk-slow",
+		.data = of_at91sam9x5_clk_slow_setup,
+	},
+	{ /*sentinel*/ }
+};
+
+static void __init of_at91sam9x5_sckc_setup(struct device_node *np)
+{
+	struct device_node *childnp;
+	void (*clk_setup)(struct device_node *, void __iomem *);
+	const struct of_device_id *clk_id;
+	void __iomem *regbase = of_iomap(np, 0);
+
+	if (!regbase)
+		return;
+
+	for_each_child_of_node(np, childnp) {
+		clk_id = of_match_node(sckc_clk_ids, childnp);
+		if (!clk_id)
+			continue;
+		clk_setup = clk_id->data;
+		clk_setup(childnp, regbase);
+	}
+}
+CLK_OF_DECLARE(at91sam9x5_clk_sckc, "atmel,at91sam9x5-sckc",
+	       of_at91sam9x5_sckc_setup);
+
+static int clk_sama5d4_slow_osc_prepare(struct clk_hw *hw)
+{
+	struct clk_sama5d4_slow_osc *osc = to_clk_sama5d4_slow_osc(hw);
+
+	if (osc->prepared)
+		return 0;
+
+	/*
+	 * Assume that if it has already been selected (for example by the
+	 * bootloader), enough time has aready passed.
+	 */
+	if ((readl(osc->sckcr) & AT91_SCKC_OSCSEL)) {
+		osc->prepared = true;
+		return 0;
+	}
+
+	if (system_state < SYSTEM_RUNNING)
+		udelay(osc->startup_usec);
+	else
+		usleep_range(osc->startup_usec, osc->startup_usec + 1);
+	osc->prepared = true;
+
+	return 0;
+}
+
+static int clk_sama5d4_slow_osc_is_prepared(struct clk_hw *hw)
+{
+	struct clk_sama5d4_slow_osc *osc = to_clk_sama5d4_slow_osc(hw);
+
+	return osc->prepared;
+}
+
+static const struct clk_ops sama5d4_slow_osc_ops = {
+	.prepare = clk_sama5d4_slow_osc_prepare,
+	.is_prepared = clk_sama5d4_slow_osc_is_prepared,
+};
+
+static void __init of_sama5d4_sckc_setup(struct device_node *np)
+{
+	void __iomem *regbase = of_iomap(np, 0);
+	struct clk_hw *hw;
+	struct clk_sama5d4_slow_osc *osc;
+	struct clk_init_data init;
+	const char *xtal_name;
+	const char *parent_names[2] = { "slow_rc_osc", "slow_osc" };
+	bool bypass;
+	int ret;
+
+	if (!regbase)
+		return;
+
+	hw = clk_hw_register_fixed_rate_with_accuracy(NULL, parent_names[0],
+						      NULL, 0, 32768,
+						      250000000);
+	if (IS_ERR(hw))
+		return;
+
+	xtal_name = of_clk_get_parent_name(np, 0);
+
+	bypass = of_property_read_bool(np, "atmel,osc-bypass");
+
+	osc = kzalloc(sizeof(*osc), GFP_KERNEL);
+	if (!osc)
+		return;
+
+	init.name = parent_names[1];
+	init.ops = &sama5d4_slow_osc_ops;
+	init.parent_names = &xtal_name;
+	init.num_parents = 1;
+	init.flags = CLK_IGNORE_UNUSED;
+
+	osc->hw.init = &init;
+	osc->sckcr = regbase;
+	osc->startup_usec = 1200000;
+
+	if (bypass)
+		writel((readl(regbase) | AT91_SCKC_OSC32BYP), regbase);
+
+	hw = &osc->hw;
+	ret = clk_hw_register(NULL, &osc->hw);
+	if (ret) {
+		kfree(osc);
+		return;
+	}
+
+	hw = at91_clk_register_sam9x5_slow(regbase, "slowck", parent_names, 2);
+	if (IS_ERR(hw))
+		return;
+
+	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
+}
+CLK_OF_DECLARE(sama5d4_clk_sckc, "atmel,sama5d4-sckc",
+	       of_sama5d4_sckc_setup);