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path: root/drivers/cpufreq/tegra20-cpufreq.c
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Diffstat (limited to 'drivers/cpufreq/tegra20-cpufreq.c')
-rw-r--r--drivers/cpufreq/tegra20-cpufreq.c200
1 files changed, 110 insertions, 90 deletions
diff --git a/drivers/cpufreq/tegra20-cpufreq.c b/drivers/cpufreq/tegra20-cpufreq.c
index 2bd62845e9d5..05f57dcd5215 100644
--- a/drivers/cpufreq/tegra20-cpufreq.c
+++ b/drivers/cpufreq/tegra20-cpufreq.c
@@ -16,16 +16,13 @@
*
*/
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/sched.h>
+#include <linux/clk.h>
#include <linux/cpufreq.h>
-#include <linux/delay.h>
-#include <linux/init.h>
#include <linux/err.h>
-#include <linux/clk.h>
-#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
static struct cpufreq_frequency_table freq_table[] = {
{ .frequency = 216000 },
@@ -39,25 +36,27 @@ static struct cpufreq_frequency_table freq_table[] = {
{ .frequency = CPUFREQ_TABLE_END },
};
-#define NUM_CPUS 2
-
-static struct clk *cpu_clk;
-static struct clk *pll_x_clk;
-static struct clk *pll_p_clk;
-static struct clk *emc_clk;
-static bool pll_x_prepared;
+struct tegra20_cpufreq {
+ struct device *dev;
+ struct cpufreq_driver driver;
+ struct clk *cpu_clk;
+ struct clk *pll_x_clk;
+ struct clk *pll_p_clk;
+ bool pll_x_prepared;
+};
static unsigned int tegra_get_intermediate(struct cpufreq_policy *policy,
unsigned int index)
{
- unsigned int ifreq = clk_get_rate(pll_p_clk) / 1000;
+ struct tegra20_cpufreq *cpufreq = cpufreq_get_driver_data();
+ unsigned int ifreq = clk_get_rate(cpufreq->pll_p_clk) / 1000;
/*
* Don't switch to intermediate freq if:
* - we are already at it, i.e. policy->cur == ifreq
* - index corresponds to ifreq
*/
- if ((freq_table[index].frequency == ifreq) || (policy->cur == ifreq))
+ if (freq_table[index].frequency == ifreq || policy->cur == ifreq)
return 0;
return ifreq;
@@ -66,6 +65,7 @@ static unsigned int tegra_get_intermediate(struct cpufreq_policy *policy,
static int tegra_target_intermediate(struct cpufreq_policy *policy,
unsigned int index)
{
+ struct tegra20_cpufreq *cpufreq = cpufreq_get_driver_data();
int ret;
/*
@@ -78,47 +78,37 @@ static int tegra_target_intermediate(struct cpufreq_policy *policy,
* Also, we wouldn't be using pll_x anymore and must not take extra
* reference to it, as it can be disabled now to save some power.
*/
- clk_prepare_enable(pll_x_clk);
+ clk_prepare_enable(cpufreq->pll_x_clk);
- ret = clk_set_parent(cpu_clk, pll_p_clk);
+ ret = clk_set_parent(cpufreq->cpu_clk, cpufreq->pll_p_clk);
if (ret)
- clk_disable_unprepare(pll_x_clk);
+ clk_disable_unprepare(cpufreq->pll_x_clk);
else
- pll_x_prepared = true;
+ cpufreq->pll_x_prepared = true;
return ret;
}
static int tegra_target(struct cpufreq_policy *policy, unsigned int index)
{
+ struct tegra20_cpufreq *cpufreq = cpufreq_get_driver_data();
unsigned long rate = freq_table[index].frequency;
- unsigned int ifreq = clk_get_rate(pll_p_clk) / 1000;
- int ret = 0;
-
- /*
- * Vote on memory bus frequency based on cpu frequency
- * This sets the minimum frequency, display or avp may request higher
- */
- if (rate >= 816000)
- clk_set_rate(emc_clk, 600000000); /* cpu 816 MHz, emc max */
- else if (rate >= 456000)
- clk_set_rate(emc_clk, 300000000); /* cpu 456 MHz, emc 150Mhz */
- else
- clk_set_rate(emc_clk, 100000000); /* emc 50Mhz */
+ unsigned int ifreq = clk_get_rate(cpufreq->pll_p_clk) / 1000;
+ int ret;
/*
* target freq == pll_p, don't need to take extra reference to pll_x_clk
* as it isn't used anymore.
*/
if (rate == ifreq)
- return clk_set_parent(cpu_clk, pll_p_clk);
+ return clk_set_parent(cpufreq->cpu_clk, cpufreq->pll_p_clk);
- ret = clk_set_rate(pll_x_clk, rate * 1000);
+ ret = clk_set_rate(cpufreq->pll_x_clk, rate * 1000);
/* Restore to earlier frequency on error, i.e. pll_x */
if (ret)
- pr_err("Failed to change pll_x to %lu\n", rate);
+ dev_err(cpufreq->dev, "Failed to change pll_x to %lu\n", rate);
- ret = clk_set_parent(cpu_clk, pll_x_clk);
+ ret = clk_set_parent(cpufreq->cpu_clk, cpufreq->pll_x_clk);
/* This shouldn't fail while changing or restoring */
WARN_ON(ret);
@@ -126,9 +116,9 @@ static int tegra_target(struct cpufreq_policy *policy, unsigned int index)
* Drop count to pll_x clock only if we switched to intermediate freq
* earlier while transitioning to a target frequency.
*/
- if (pll_x_prepared) {
- clk_disable_unprepare(pll_x_clk);
- pll_x_prepared = false;
+ if (cpufreq->pll_x_prepared) {
+ clk_disable_unprepare(cpufreq->pll_x_clk);
+ cpufreq->pll_x_prepared = false;
}
return ret;
@@ -136,81 +126,111 @@ static int tegra_target(struct cpufreq_policy *policy, unsigned int index)
static int tegra_cpu_init(struct cpufreq_policy *policy)
{
+ struct tegra20_cpufreq *cpufreq = cpufreq_get_driver_data();
int ret;
- if (policy->cpu >= NUM_CPUS)
- return -EINVAL;
-
- clk_prepare_enable(emc_clk);
- clk_prepare_enable(cpu_clk);
+ clk_prepare_enable(cpufreq->cpu_clk);
/* FIXME: what's the actual transition time? */
ret = cpufreq_generic_init(policy, freq_table, 300 * 1000);
if (ret) {
- clk_disable_unprepare(cpu_clk);
- clk_disable_unprepare(emc_clk);
+ clk_disable_unprepare(cpufreq->cpu_clk);
return ret;
}
- policy->clk = cpu_clk;
+ policy->clk = cpufreq->cpu_clk;
policy->suspend_freq = freq_table[0].frequency;
return 0;
}
static int tegra_cpu_exit(struct cpufreq_policy *policy)
{
- clk_disable_unprepare(cpu_clk);
- clk_disable_unprepare(emc_clk);
+ struct tegra20_cpufreq *cpufreq = cpufreq_get_driver_data();
+
+ clk_disable_unprepare(cpufreq->cpu_clk);
return 0;
}
-static struct cpufreq_driver tegra_cpufreq_driver = {
- .flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK,
- .verify = cpufreq_generic_frequency_table_verify,
- .get_intermediate = tegra_get_intermediate,
- .target_intermediate = tegra_target_intermediate,
- .target_index = tegra_target,
- .get = cpufreq_generic_get,
- .init = tegra_cpu_init,
- .exit = tegra_cpu_exit,
- .name = "tegra",
- .attr = cpufreq_generic_attr,
- .suspend = cpufreq_generic_suspend,
-};
-
-static int __init tegra_cpufreq_init(void)
+static int tegra20_cpufreq_probe(struct platform_device *pdev)
{
- cpu_clk = clk_get_sys(NULL, "cclk");
- if (IS_ERR(cpu_clk))
- return PTR_ERR(cpu_clk);
-
- pll_x_clk = clk_get_sys(NULL, "pll_x");
- if (IS_ERR(pll_x_clk))
- return PTR_ERR(pll_x_clk);
-
- pll_p_clk = clk_get_sys(NULL, "pll_p");
- if (IS_ERR(pll_p_clk))
- return PTR_ERR(pll_p_clk);
-
- emc_clk = clk_get_sys("cpu", "emc");
- if (IS_ERR(emc_clk)) {
- clk_put(cpu_clk);
- return PTR_ERR(emc_clk);
+ struct tegra20_cpufreq *cpufreq;
+ int err;
+
+ cpufreq = devm_kzalloc(&pdev->dev, sizeof(*cpufreq), GFP_KERNEL);
+ if (!cpufreq)
+ return -ENOMEM;
+
+ cpufreq->cpu_clk = clk_get_sys(NULL, "cclk");
+ if (IS_ERR(cpufreq->cpu_clk))
+ return PTR_ERR(cpufreq->cpu_clk);
+
+ cpufreq->pll_x_clk = clk_get_sys(NULL, "pll_x");
+ if (IS_ERR(cpufreq->pll_x_clk)) {
+ err = PTR_ERR(cpufreq->pll_x_clk);
+ goto put_cpu;
+ }
+
+ cpufreq->pll_p_clk = clk_get_sys(NULL, "pll_p");
+ if (IS_ERR(cpufreq->pll_p_clk)) {
+ err = PTR_ERR(cpufreq->pll_p_clk);
+ goto put_pll_x;
}
- return cpufreq_register_driver(&tegra_cpufreq_driver);
+ cpufreq->dev = &pdev->dev;
+ cpufreq->driver.get = cpufreq_generic_get;
+ cpufreq->driver.attr = cpufreq_generic_attr;
+ cpufreq->driver.init = tegra_cpu_init;
+ cpufreq->driver.exit = tegra_cpu_exit;
+ cpufreq->driver.flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK;
+ cpufreq->driver.verify = cpufreq_generic_frequency_table_verify;
+ cpufreq->driver.suspend = cpufreq_generic_suspend;
+ cpufreq->driver.driver_data = cpufreq;
+ cpufreq->driver.target_index = tegra_target;
+ cpufreq->driver.get_intermediate = tegra_get_intermediate;
+ cpufreq->driver.target_intermediate = tegra_target_intermediate;
+ snprintf(cpufreq->driver.name, CPUFREQ_NAME_LEN, "tegra");
+
+ err = cpufreq_register_driver(&cpufreq->driver);
+ if (err)
+ goto put_pll_p;
+
+ platform_set_drvdata(pdev, cpufreq);
+
+ return 0;
+
+put_pll_p:
+ clk_put(cpufreq->pll_p_clk);
+put_pll_x:
+ clk_put(cpufreq->pll_x_clk);
+put_cpu:
+ clk_put(cpufreq->cpu_clk);
+
+ return err;
}
-static void __exit tegra_cpufreq_exit(void)
+static int tegra20_cpufreq_remove(struct platform_device *pdev)
{
- cpufreq_unregister_driver(&tegra_cpufreq_driver);
- clk_put(emc_clk);
- clk_put(cpu_clk);
+ struct tegra20_cpufreq *cpufreq = platform_get_drvdata(pdev);
+
+ cpufreq_unregister_driver(&cpufreq->driver);
+
+ clk_put(cpufreq->pll_p_clk);
+ clk_put(cpufreq->pll_x_clk);
+ clk_put(cpufreq->cpu_clk);
+
+ return 0;
}
+static struct platform_driver tegra20_cpufreq_driver = {
+ .probe = tegra20_cpufreq_probe,
+ .remove = tegra20_cpufreq_remove,
+ .driver = {
+ .name = "tegra20-cpufreq",
+ },
+};
+module_platform_driver(tegra20_cpufreq_driver);
+MODULE_ALIAS("platform:tegra20-cpufreq");
MODULE_AUTHOR("Colin Cross <ccross@android.com>");
-MODULE_DESCRIPTION("cpufreq driver for Nvidia Tegra2");
+MODULE_DESCRIPTION("NVIDIA Tegra20 cpufreq driver");
MODULE_LICENSE("GPL");
-module_init(tegra_cpufreq_init);
-module_exit(tegra_cpufreq_exit);