[PATCH v2 4/6] ARM: tegra: Add clk_tegra structure and helper functions

Prashant Gaikwad
2012-07-03T11:09:19Z

Add Tegra platform specific clock structure clk_tegra and
some helper functions for generic clock framework.

struct clk_tegra is the single strcture used for all types of
clocks. reset and cfg_ex ops moved to clk_tegra from clk_ops.

Signed-off-by: Prashant Gaikwad <pgaikwad@nvidia.com>
---
arch/arm/mach-tegra/clock.c | 126 +++++++++++++++++++++++++++++++-
arch/arm/mach-tegra/clock.h | 90 ++++++++++++++++++++---
arch/arm/mach-tegra/common.c | 2 +
arch/arm/mach-tegra/include/mach/clk.h | 3 +
4 files changed, 210 insertions(+), 11 deletions(-)

diff --git a/arch/arm/mach-tegra/clock.c b/arch/arm/mach-tegra/clock.c
index 58f981c..ef9b494 100644
--- a/arch/arm/mach-tegra/clock.c
+++ b/arch/arm/mach-tegra/clock.c
@@ -1,6 +1,7 @@
/*
*
* Copyright (C) 2010 Google, Inc.
+ * Copyright (c) 2012 NVIDIA CORPORATION. All rights reserved.
*
* Author:
* Colin Cross <ccross@google.com>
@@ -62,6 +63,7 @@
static DEFINE_MUTEX(clock_list_lock);
static LIST_HEAD(clocks);

+#ifndef CONFIG_COMMON_CLK
struct clk *tegra_get_clock_by_name(const char *name)
{
struct clk *c;
@@ -668,5 +670,127 @@ err_out:
debugfs_remove_recursive(clk_debugfs_root);
return err;
}
-
#endif
+#else
+
+void tegra_clk_add(struct clk *clk)
+{
+ struct clk_tegra *c = to_clk_tegra(__clk_get_hw(clk));
+
+ mutex_lock(&clock_list_lock);
+ list_add(&c->node, &clocks);
+ mutex_unlock(&clock_list_lock);
+}
+
+struct clk *tegra_get_clock_by_name(const char *name)
+{
+ struct clk_tegra *c;
+ struct clk *ret = NULL;
+ mutex_lock(&clock_list_lock);
+ list_for_each_entry(c, &clocks, node) {
+ if (strcmp(__clk_get_name(c->hw.clk), name) == 0) {
+ ret = c->hw.clk;
+ break;
+ }
+ }
+ mutex_unlock(&clock_list_lock);
+ return ret;
+}
+
+static int tegra_clk_init_one_from_table(struct tegra_clk_init_table *table)
+{
+ struct clk *c;
+ struct clk *p;
+ struct clk *parent;
+
+ int ret = 0;
+
+ c = tegra_get_clock_by_name(table->name);
+
+ if (!c) {
+ pr_warn("Unable to initialize clock %s\n",
+ table->name);
+ return -ENODEV;
+ }
+
+ parent = clk_get_parent(c);
+
+ if (table->parent) {
+ p = tegra_get_clock_by_name(table->parent);
+ if (!p) {
+ pr_warn("Unable to find parent %s of clock %s\n",
+ table->parent, table->name);
+ return -ENODEV;
+ }
+
+ if (parent != p) {
+ ret = clk_set_parent(c, p);
+ if (ret) {
+ pr_warn("Unable to set parent %s of clock %s: %d\n",
+ table->parent, table->name, ret);
+ return -EINVAL;
+ }
+ }
+ }
+
+ if (table->rate && table->rate != clk_get_rate(c)) {
+ ret = clk_set_rate(c, table->rate);
+ if (ret) {
+ pr_warn("Unable to set clock %s to rate %lu: %d\n",
+ table->name, table->rate, ret);
+ return -EINVAL;
+ }
+ }
+
+ if (table->enabled) {
+ ret = clk_prepare_enable(c);
+ if (ret) {
+ pr_warn("Unable to enable clock %s: %d\n",
+ table->name, ret);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+void tegra_clk_init_from_table(struct tegra_clk_init_table *table)
+{
+ for (; table->name; table++)
+ tegra_clk_init_one_from_table(table);
+}
+
+void tegra_periph_reset_deassert(struct clk *c)
+{
+ struct clk_tegra *clk = to_clk_tegra(__clk_get_hw(c));
+ BUG_ON(!clk->reset);
+ clk->reset(__clk_get_hw(c), false);
+}
+EXPORT_SYMBOL(tegra_periph_reset_deassert);
+
+void tegra_periph_reset_assert(struct clk *c)
+{
+ struct clk_tegra *clk = to_clk_tegra(__clk_get_hw(c));
+ BUG_ON(!clk->reset);
+ clk->reset(__clk_get_hw(c), true);
+}
+EXPORT_SYMBOL(tegra_periph_reset_assert);
+
+/* Several extended clock configuration bits (e.g., clock routing, clock
+ * phase control) are included in PLL and peripheral clock source
+ * registers. */
+int tegra_clk_cfg_ex(struct clk *c, enum tegra_clk_ex_param p, u32 setting)
+{
+ int ret = 0;
+ struct clk_tegra *clk = to_clk_tegra(__clk_get_hw(c));
+
+ if (!clk->clk_cfg_ex) {
+ ret = -ENOSYS;
+ goto out;
+ }
+ ret = clk->clk_cfg_ex(__clk_get_hw(c), p, setting);
+
+out:
+ return ret;
+}
+#endif /* !CONFIG_COMMON_CLK */
diff --git a/arch/arm/mach-tegra/clock.h b/arch/arm/mach-tegra/clock.h
index bc30065..f4d32ba 100644
--- a/arch/arm/mach-tegra/clock.h
+++ b/arch/arm/mach-tegra/clock.h
@@ -2,6 +2,7 @@
* arch/arm/mach-tegra/include/mach/clock.h
*
* Copyright (C) 2010 Google, Inc.
+ * Copyright (c) 2012 NVIDIA CORPORATION. All rights reserved.
*
* Author:
* Colin Cross <ccross@google.com>
@@ -20,6 +21,7 @@
#ifndef __MACH_TEGRA_CLOCK_H
#define __MACH_TEGRA_CLOCK_H

+#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/list.h>
#include <linux/spinlock.h>
@@ -54,6 +56,11 @@

struct clk;

+#ifdef CONFIG_COMMON_CLK
+struct clk_tegra;
+#define to_clk_tegra(_hw) container_of(_hw, struct clk_tegra, hw)
+#endif
+
struct clk_mux_sel {
struct clk *input;
u32 value;
@@ -68,6 +75,13 @@ struct clk_pll_freq_table {
u8 cpcon;
};

+enum clk_state {
+ UNINITIALIZED = 0,
+ ON,
+ OFF,
+};
+
+#ifndef CONFIG_COMMON_CLK
struct clk_ops {
void (*init)(struct clk *);
int (*enable)(struct clk *);
@@ -80,12 +94,6 @@ struct clk_ops {
enum tegra_clk_ex_param, u32);
};

-enum clk_state {
- UNINITIALIZED = 0,
- ON,
- OFF,
-};
-
struct clk {
/* node for master clocks list */
struct list_head node; /* node for list of all clocks */
@@ -147,6 +155,65 @@ struct clk {
spinlock_t spinlock;
};

+#else
+
+struct clk_tegra {
+ /* node for master clocks list */
+ struct list_head node; /* node for list of all clocks */
+ struct clk_lookup lookup;
+ struct clk_hw hw;
+
+ bool set;
+ unsigned long fixed_rate;
+ unsigned long max_rate;
+ unsigned long min_rate;
+ u32 flags;
+ const char *name;
+
+ enum clk_state state;
+ u32 div;
+ u32 mul;
+
+ u32 reg;
+ u32 reg_shift;
+
+ struct list_head shared_bus_list;
+
+ union {
+ struct {
+ unsigned int clk_num;
+ } periph;
+ struct {
+ unsigned long input_min;
+ unsigned long input_max;
+ unsigned long cf_min;
+ unsigned long cf_max;
+ unsigned long vco_min;
+ unsigned long vco_max;
+ const struct clk_pll_freq_table *freq_table;
+ int lock_delay;
+ unsigned long fixed_rate;
+ } pll;
+ struct {
+ u32 sel;
+ u32 reg_mask;
+ } mux;
+ struct {
+ struct clk *main;
+ struct clk *backup;
+ } cpu;
+ struct {
+ struct list_head node;
+ bool enabled;
+ unsigned long rate;
+ } shared_bus_user;
+ } u;
+
+ void (*reset)(struct clk_hw *, bool);
+ int (*clk_cfg_ex)(struct clk_hw *, enum tegra_clk_ex_param, u32);
+};
+#endif /* !CONFIG_COMMON_CLK */
+
struct clk_duplicate {
const char *name;
struct clk_lookup lookup;
@@ -159,13 +226,16 @@ struct tegra_clk_init_table {
bool enabled;
};

+#ifndef CONFIG_COMMON_CLK
+void clk_init(struct clk *clk);
+unsigned long clk_get_rate_locked(struct clk *c);
+int clk_set_rate_locked(struct clk *c, unsigned long rate);
+int clk_reparent(struct clk *c, struct clk *parent);
+#endif /* !CONFIG_COMMON_CLK */
+
void tegra2_init_clocks(void);
void tegra30_init_clocks(void);
-void clk_init(struct clk *clk);
struct clk *tegra_get_clock_by_name(const char *name);
-int clk_reparent(struct clk *c, struct clk *parent);
void tegra_clk_init_from_table(struct tegra_clk_init_table *table);
-unsigned long clk_get_rate_locked(struct clk *c);
-int clk_set_rate_locked(struct clk *c, unsigned long rate);

#endif
diff --git a/arch/arm/mach-tegra/common.c b/arch/arm/mach-tegra/common.c
index 204a5c8..c91a1b2 100644
--- a/arch/arm/mach-tegra/common.c
+++ b/arch/arm/mach-tegra/common.c
@@ -149,6 +149,8 @@ void __init tegra30_init_early(void)

void __init tegra_init_late(void)
{
+#ifndef CONFIG_COMMON_CLK
tegra_clk_debugfs_init();
+#endif
tegra_powergate_debugfs_init();
}
diff --git a/arch/arm/mach-tegra/include/mach/clk.h b/arch/arm/mach-tegra/include/mach/clk.h
index d97e403..95f3a54 100644
--- a/arch/arm/mach-tegra/include/mach/clk.h
+++ b/arch/arm/mach-tegra/include/mach/clk.h
@@ -34,7 +34,10 @@ enum tegra_clk_ex_param {
void tegra_periph_reset_deassert(struct clk *c);
void tegra_periph_reset_assert(struct clk *c);

+#ifndef CONFIG_COMMON_CLK
unsigned long clk_get_rate_all_locked(struct clk *c);
+#endif
+
void tegra2_sdmmc_tap_delay(struct clk *c, int delay);
int tegra_clk_cfg_ex(struct clk *c, enum tegra_clk_ex_param p, u32 setting);

--
1.7.4.1