Initial import

1 files changed, 494 insertions, 0 deletions

diff --git a/drivers/clk/at91/clk-slow.c b/drivers/clk/at91/clk-slow.c
new file mode 100644
index 000000000..2f13bd524
--- /dev/null
+++ b/drivers/clk/at91/clk-slow.c
@@ -0,0 +1,494 @@
+/*
+ * drivers/clk/at91/clk-slow.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/clk/at91_pmc.h>
+#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+
+#include "pmc.h"
+#include "sckc.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_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_sam9260_slow {
+	struct clk_hw hw;
+	struct at91_pmc *pmc;
+};
+
+#define to_clk_sam9260_slow(hw) container_of(hw, struct clk_sam9260_slow, 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 struct clk *slow_clk;
+
+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)
+		return 0;
+
+	writel(tmp | AT91_SCKC_OSC32EN, sckcr);
+
+	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 * __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 *clk = NULL;
+	struct clk_init_data init;
+
+	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);
+
+	clk = clk_register(NULL, &osc->hw);
+	if (IS_ERR(clk))
+		kfree(osc);
+
+	return clk;
+}
+
+void __init of_at91sam9x5_clk_slow_osc_setup(struct device_node *np,
+					     void __iomem *sckcr)
+{
+	struct clk *clk;
+	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");
+
+	clk = at91_clk_register_slow_osc(sckcr, name, parent_name, startup,
+					 bypass);
+	if (IS_ERR(clk))
+		return;
+
+	of_clk_add_provider(np, of_clk_src_simple_get, clk);
+}
+
+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);
+
+	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 * __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 *clk = NULL;
+	struct clk_init_data init;
+
+	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_IS_ROOT | CLK_IGNORE_UNUSED;
+
+	osc->hw.init = &init;
+	osc->sckcr = sckcr;
+	osc->frequency = frequency;
+	osc->accuracy = accuracy;
+	osc->startup_usec = startup;
+
+	clk = clk_register(NULL, &osc->hw);
+	if (IS_ERR(clk))
+		kfree(osc);
+
+	return clk;
+}
+
+void __init of_at91sam9x5_clk_slow_rc_osc_setup(struct device_node *np,
+						void __iomem *sckcr)
+{
+	struct clk *clk;
+	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);
+
+	clk = at91_clk_register_slow_rc_osc(sckcr, name, frequency, accuracy,
+					    startup);
+	if (IS_ERR(clk))
+		return;
+
+	of_clk_add_provider(np, of_clk_src_simple_get, clk);
+}
+
+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);
+
+	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 * __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 *clk = NULL;
+	struct clk_init_data init;
+
+	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);
+
+	clk = clk_register(NULL, &slowck->hw);
+	if (IS_ERR(clk))
+		kfree(slowck);
+	else
+		slow_clk = clk;
+
+	return clk;
+}
+
+void __init of_at91sam9x5_clk_slow_setup(struct device_node *np,
+					 void __iomem *sckcr)
+{
+	struct clk *clk;
+	const char *parent_names[2];
+	int num_parents;
+	const char *name = np->name;
+	int i;
+
+	num_parents = of_count_phandle_with_args(np, "clocks", "#clock-cells");
+	if (num_parents <= 0 || num_parents > 2)
+		return;
+
+	for (i = 0; i < num_parents; ++i) {
+		parent_names[i] = of_clk_get_parent_name(np, i);
+		if (!parent_names[i])
+			return;
+	}
+
+	of_property_read_string(np, "clock-output-names", &name);
+
+	clk = at91_clk_register_sam9x5_slow(sckcr, name, parent_names,
+					    num_parents);
+	if (IS_ERR(clk))
+		return;
+
+	of_clk_add_provider(np, of_clk_src_simple_get, clk);
+}
+
+static u8 clk_sam9260_slow_get_parent(struct clk_hw *hw)
+{
+	struct clk_sam9260_slow *slowck = to_clk_sam9260_slow(hw);
+
+	return !!(pmc_read(slowck->pmc, AT91_PMC_SR) & AT91_PMC_OSCSEL);
+}
+
+static const struct clk_ops sam9260_slow_ops = {
+	.get_parent = clk_sam9260_slow_get_parent,
+};
+
+static struct clk * __init
+at91_clk_register_sam9260_slow(struct at91_pmc *pmc,
+			       const char *name,
+			       const char **parent_names,
+			       int num_parents)
+{
+	struct clk_sam9260_slow *slowck;
+	struct clk *clk = NULL;
+	struct clk_init_data init;
+
+	if (!pmc || !name)
+		return ERR_PTR(-EINVAL);
+
+	if (!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 = &sam9260_slow_ops;
+	init.parent_names = parent_names;
+	init.num_parents = num_parents;
+	init.flags = 0;
+
+	slowck->hw.init = &init;
+	slowck->pmc = pmc;
+
+	clk = clk_register(NULL, &slowck->hw);
+	if (IS_ERR(clk))
+		kfree(slowck);
+	else
+		slow_clk = clk;
+
+	return clk;
+}
+
+void __init of_at91sam9260_clk_slow_setup(struct device_node *np,
+					  struct at91_pmc *pmc)
+{
+	struct clk *clk;
+	const char *parent_names[2];
+	int num_parents;
+	const char *name = np->name;
+	int i;
+
+	num_parents = of_count_phandle_with_args(np, "clocks", "#clock-cells");
+	if (num_parents != 2)
+		return;
+
+	for (i = 0; i < num_parents; ++i) {
+		parent_names[i] = of_clk_get_parent_name(np, i);
+		if (!parent_names[i])
+			return;
+	}
+
+	of_property_read_string(np, "clock-output-names", &name);
+
+	clk = at91_clk_register_sam9260_slow(pmc, name, parent_names,
+					     num_parents);
+	if (IS_ERR(clk))
+		return;
+
+	of_clk_add_provider(np, of_clk_src_simple_get, clk);
+}
+
+/*
+ * FIXME: All slow clk users are not properly claiming it (get + prepare +
+ * enable) before using it.
+ * If all users properly claiming this clock decide that they don't need it
+ * anymore (or are removed), it is disabled while faulty users are still
+ * requiring it, and the system hangs.
+ * Prevent this clock from being disabled until all users are properly
+ * requesting it.
+ * Once this is done we should remove this function and the slow_clk variable.
+ */
+static int __init of_at91_clk_slow_retain(void)
+{
+	if (!slow_clk)
+		return 0;
+
+	__clk_get(slow_clk);
+	clk_prepare_enable(slow_clk);
+
+	return 0;
+}
+arch_initcall(of_at91_clk_slow_retain);