[PATCH 07/21] ARM: tegra: clock: Drop CPU dvfs

Colin Cross
2011-02-13T09:46:11Z

The existing version did not extend well to core dvfs, drop it
for now until the new clk api with clk_prepare and clk_unprepare
is ready and non-atomic clocks are possible.

Signed-off-by: Colin Cross <ccross@android.com>
---
arch/arm/mach-tegra/Makefile | 1 -
arch/arm/mach-tegra/clock.c | 159 +-------------------------------
arch/arm/mach-tegra/clock.h | 24 -----
arch/arm/mach-tegra/cpu-tegra.c | 2 +-
arch/arm/mach-tegra/include/mach/clk.h | 5 -
arch/arm/mach-tegra/tegra2_clocks.c | 2 -
arch/arm/mach-tegra/tegra2_dvfs.c | 86 -----------------
arch/arm/mach-tegra/tegra2_dvfs.h | 20 ----
8 files changed, 2 insertions(+), 297 deletions(-)
delete mode 100644 arch/arm/mach-tegra/tegra2_dvfs.c
delete mode 100644 arch/arm/mach-tegra/tegra2_dvfs.h

diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index 6b537de..23de060 100644
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -9,7 +9,6 @@ obj-y += powergate.o
obj-y += fuse.o
obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += clock.o
obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += tegra2_clocks.o
-obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += tegra2_dvfs.o
obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += pinmux-t2-tables.o
obj-$(CONFIG_SMP) += platsmp.o localtimer.o headsmp.o
obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o
diff --git a/arch/arm/mach-tegra/clock.c b/arch/arm/mach-tegra/clock.c
index 79c0bd8..a1193f9 100644
--- a/arch/arm/mach-tegra/clock.c
+++ b/arch/arm/mach-tegra/clock.c
@@ -24,81 +24,14 @@
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
-#include <linux/regulator/consumer.h>
#include <linux/clkdev.h>

-#include "clock.h"
#include "board.h"
-#include "fuse.h"
+#include "clock.h"

static LIST_HEAD(clocks);

static DEFINE_SPINLOCK(clock_lock);
-static DEFINE_MUTEX(dvfs_lock);
-
-static int clk_is_dvfs(struct clk *c)
-{
- return (c->dvfs != NULL);
-};
-
-static int dvfs_set_rate(struct dvfs *d, unsigned long rate)
-{
- struct dvfs_table *t;
-
- if (d->table == NULL)
- return -ENODEV;
-
- for (t = d->table; t->rate != 0; t++) {
- if (rate <= t->rate) {
- if (!d->reg)
- return 0;
-
- return regulator_set_voltage(d->reg,
- t->millivolts * 1000,
- d->max_millivolts * 1000);
- }
- }
-
- return -EINVAL;
-}
-
-static void dvfs_init(struct clk *c)
-{
- int process_id;
- int i;
- struct dvfs_table *table;
-
- process_id = c->dvfs->cpu ? tegra_core_process_id() :
- tegra_cpu_process_id();
-
- for (i = 0; i < c->dvfs->process_id_table_length; i++)
- if (process_id == c->dvfs->process_id_table[i].process_id)
- c->dvfs->table = c->dvfs->process_id_table[i].table;
-
- if (c->dvfs->table == NULL) {
- pr_err("Failed to find dvfs table for clock %s process %d\n",
- c->name, process_id);
- return;
- }
-
- c->dvfs->max_millivolts = 0;
- for (table = c->dvfs->table; table->rate != 0; table++)
- if (c->dvfs->max_millivolts < table->millivolts)
- c->dvfs->max_millivolts = table->millivolts;
-
- c->dvfs->reg = regulator_get(NULL, c->dvfs->reg_id);
-
- if (IS_ERR(c->dvfs->reg)) {
- pr_err("Failed to get regulator %s for clock %s\n",
- c->dvfs->reg_id, c->name);
- c->dvfs->reg = NULL;
- return;
- }
-
- if (c->refcnt > 0)
- dvfs_set_rate(c->dvfs, c->rate);
-}
-
struct clk *tegra_get_clock_by_name(const char *name)
{
struct clk *c;
@@ -214,34 +147,11 @@ int clk_enable_locked(struct clk *c)
return 0;
}

-int clk_enable_cansleep(struct clk *c)
-{
- int ret;
- unsigned long flags;
-
- mutex_lock(&dvfs_lock);
-
- if (clk_is_dvfs(c) && c->refcnt > 0)
- dvfs_set_rate(c->dvfs, c->rate);
-
- spin_lock_irqsave(&clock_lock, flags);
- ret = clk_enable_locked(c);
- spin_unlock_irqrestore(&clock_lock, flags);
-
- mutex_unlock(&dvfs_lock);
-
- return ret;
-}
-EXPORT_SYMBOL(clk_enable_cansleep);
-
int clk_enable(struct clk *c)
{
int ret;
unsigned long flags;

- if (clk_is_dvfs(c))
- BUG();
-
spin_lock_irqsave(&clock_lock, flags);
ret = clk_enable_locked(c);
spin_unlock_irqrestore(&clock_lock, flags);
@@ -268,30 +178,10 @@ void clk_disable_locked(struct clk *c)
c->refcnt--;
}

-void clk_disable_cansleep(struct clk *c)
-{
- unsigned long flags;
-
- mutex_lock(&dvfs_lock);
-
- spin_lock_irqsave(&clock_lock, flags);
- clk_disable_locked(c);
- spin_unlock_irqrestore(&clock_lock, flags);
-
- if (clk_is_dvfs(c) && c->refcnt == 0)
- dvfs_set_rate(c->dvfs, c->rate);
-
- mutex_unlock(&dvfs_lock);
-}
-EXPORT_SYMBOL(clk_disable_cansleep);
-
void clk_disable(struct clk *c)
{
unsigned long flags;

- if (clk_is_dvfs(c))
- BUG();
-
spin_lock_irqsave(&clock_lock, flags);
clk_disable_locked(c);
spin_unlock_irqrestore(&clock_lock, flags);
@@ -356,41 +246,11 @@ int clk_set_rate_locked(struct clk *c, unsigned long rate)
return 0;
}

-int clk_set_rate_cansleep(struct clk *c, unsigned long rate)
-{
- int ret = 0;
- unsigned long flags;
-
- mutex_lock(&dvfs_lock);
-
- if (rate > c->rate)
- ret = dvfs_set_rate(c->dvfs, rate);
- if (ret)
- goto out;
-
- spin_lock_irqsave(&clock_lock, flags);
- ret = clk_set_rate_locked(c, rate);
- spin_unlock_irqrestore(&clock_lock, flags);
-
- if (ret)
- goto out;
-
- ret = dvfs_set_rate(c->dvfs, rate);
-
-out:
- mutex_unlock(&dvfs_lock);
- return ret;
-}
-EXPORT_SYMBOL(clk_set_rate_cansleep);
-
int clk_set_rate(struct clk *c, unsigned long rate)
{
int ret = 0;
unsigned long flags;

- if (clk_is_dvfs(c))
- BUG();
-
spin_lock_irqsave(&clock_lock, flags);
ret = clk_set_rate_locked(c, rate);
spin_unlock_irqrestore(&clock_lock, flags);
@@ -503,23 +363,6 @@ void __init tegra_init_clock(void)
tegra2_init_clocks();
}

-int __init tegra_init_dvfs(void)
-{
- struct clk *c, *safe;
-
- mutex_lock(&dvfs_lock);
-
- list_for_each_entry_safe(c, safe, &clocks, node)
- if (c->dvfs)
- dvfs_init(c);
-
- mutex_unlock(&dvfs_lock);
-
- return 0;
-}
-
-late_initcall(tegra_init_dvfs);
-
/*
* Iterate through all clocks, disabling any for which the refcount is 0
* but the clock init detected the bootloader left the clock on.
diff --git a/arch/arm/mach-tegra/clock.h b/arch/arm/mach-tegra/clock.h
index b76d33d..198f234 100644
--- a/arch/arm/mach-tegra/clock.h
+++ b/arch/arm/mach-tegra/clock.h
@@ -41,28 +41,6 @@
#define ENABLE_ON_INIT (1 << 28)

struct clk;
-struct regulator;
-
-struct dvfs_table {
- unsigned long rate;
- int millivolts;
-};
-
-struct dvfs_process_id_table {
- int process_id;
- struct dvfs_table *table;
-};
-
-struct dvfs {
- struct regulator *reg;
- struct dvfs_table *table;
- int max_millivolts;
-
- int process_id_table_length;
- const char *reg_id;
- bool cpu;
- struct dvfs_process_id_table process_id_table[];
-};

struct clk_mux_sel {
struct clk *input;
@@ -141,8 +119,6 @@ struct clk {
/* Virtual cpu clock */
struct clk *main;
struct clk *backup;
-
- struct dvfs *dvfs;
};

diff --git a/arch/arm/mach-tegra/cpu-tegra.c b/arch/arm/mach-tegra/cpu-tegra.c
index ad26a9f..cda03f1 100644
--- a/arch/arm/mach-tegra/cpu-tegra.c
+++ b/arch/arm/mach-tegra/cpu-tegra.c
@@ -91,7 +91,7 @@ static int tegra_update_cpu_speed(unsigned long rate)
freqs.old, freqs.new);
#endif

- ret = clk_set_rate_cansleep(cpu_clk, freqs.new * 1000);
+ ret = clk_set_rate(cpu_clk, freqs.new * 1000);
if (ret) {
pr_err("cpu-tegra: Failed to set cpu frequency to %d kHz\n",
freqs.new);
diff --git a/arch/arm/mach-tegra/include/mach/clk.h b/arch/arm/mach-tegra/include/mach/clk.h
index a217f68..6338652 100644
--- a/arch/arm/mach-tegra/include/mach/clk.h
+++ b/arch/arm/mach-tegra/include/mach/clk.h
@@ -25,9 +25,4 @@ struct clk;
void tegra_periph_reset_deassert(struct clk *c);
void tegra_periph_reset_assert(struct clk *c);

-int clk_enable_cansleep(struct clk *clk);
-void clk_disable_cansleep(struct clk *clk);
-int clk_set_rate_cansleep(struct clk *clk, unsigned long rate);
-int clk_set_parent_cansleep(struct clk *clk, struct clk *parent);
-
#endif
diff --git a/arch/arm/mach-tegra/tegra2_clocks.c b/arch/arm/mach-tegra/tegra2_clocks.c
index 36da2e8..e1e0d81f 100644
--- a/arch/arm/mach-tegra/tegra2_clocks.c
+++ b/arch/arm/mach-tegra/tegra2_clocks.c
@@ -31,7 +31,6 @@

#include "clock.h"
#include "fuse.h"
-#include "tegra2_dvfs.h"

#define RST_DEVICES 0x004
#define RST_DEVICES_SET 0x300
@@ -1650,7 +1649,6 @@ static struct clk tegra_clk_virtual_cpu = {
.backup = &tegra_pll_p,
.ops = &tegra_cpu_ops,
.max_rate = 1000000000,
- .dvfs = &tegra_dvfs_virtual_cpu_dvfs,
};

static struct clk tegra_clk_hclk = {
diff --git a/arch/arm/mach-tegra/tegra2_dvfs.c b/arch/arm/mach-tegra/tegra2_dvfs.c
deleted file mode 100644
index 5529c23..0000000
--- a/arch/arm/mach-tegra/tegra2_dvfs.c
+++ /dev/null
@@ -1,86 +0,0 @@
-/*
- * arch/arm/mach-tegra/tegra2_dvfs.c
- *
- * Copyright (C) 2010 Google, Inc.
- *
- * Author:
- * Colin Cross <ccross@google.com>
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- */
-
-#include <linux/kernel.h>
-
-#include "clock.h"
-#include "tegra2_dvfs.h"
-
-static struct dvfs_table virtual_cpu_process_0[] = {
- {314000000, 750},
- {456000000, 825},
- {608000000, 900},
- {760000000, 975},
- {817000000, 1000},
- {912000000, 1050},
- {1000000000, 1100},
- {0, 0},
-};
-
-static struct dvfs_table virtual_cpu_process_1[] = {
- {314000000, 750},
- {456000000, 825},
- {618000000, 900},
- {770000000, 975},
- {827000000, 1000},
- {922000000, 1050},
- {1000000000, 1100},
- {0, 0},
-};
-
-static struct dvfs_table virtual_cpu_process_2[] = {
- {494000000, 750},
- {675000000, 825},
- {817000000, 875},
- {922000000, 925},
- {1000000000, 975},
- {0, 0},
-};
-
-static struct dvfs_table virtual_cpu_process_3[] = {
- {730000000, 750},
- {760000000, 775},
- {845000000, 800},
- {1000000000, 875},
- {0, 0},
-};
-
-struct dvfs tegra_dvfs_virtual_cpu_dvfs = {
- .reg_id = "vdd_cpu",
- .process_id_table = {
- {
- .process_id = 0,
- .table = virtual_cpu_process_0,
- },
- {
- .process_id = 1,
- .table = virtual_cpu_process_1,
- },
- {
- .process_id = 2,
- .table = virtual_cpu_process_2,
- },
- {
- .process_id = 3,
- .table = virtual_cpu_process_3,
- },
- },
- .process_id_table_length = 4,
- .cpu = 1,
-};
diff --git a/arch/arm/mach-tegra/tegra2_dvfs.h b/arch/arm/mach-tegra/tegra2_dvfs.h
deleted file mode 100644
index f8c1adb..0000000
--- a/arch/arm/mach-tegra/tegra2_dvfs.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- * arch/arm/mach-tegra/tegra2_dvfs.h
- *
- * Copyright (C) 2010 Google, Inc.
- *
- * Author:
- * Colin Cross <ccross@google.com>
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- */
-
-extern struct dvfs tegra_dvfs_virtual_cpu_dvfs;
--
1.7.3.1