diff options
Diffstat (limited to 'drivers/cpufreq/vexpress_big_little.c')
-rw-r--r-- | drivers/cpufreq/vexpress_big_little.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/drivers/cpufreq/vexpress_big_little.c b/drivers/cpufreq/vexpress_big_little.c new file mode 100644 index 000000000000..66648c3fc949 --- /dev/null +++ b/drivers/cpufreq/vexpress_big_little.c @@ -0,0 +1,74 @@ +/* + * Vexpress big.LITTLE CPUFreq Interface driver + * + * It provides necessary ops to arm_big_little cpufreq driver and gets + * information from spc controller. + * + * Copyright (C) 2012 ARM Ltd. + * Author: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com> + * + * Copyright (C) 2012 Linaro. + * Viresh Kumar <viresh.kumar@linaro.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/cpufreq.h> +#include <linux/export.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/vexpress.h> +#include "arm_big_little.h" + +static struct cpufreq_frequency_table *vexpress_get_freq_tbl(u32 cluster, + int *count) +{ + unsigned int *table = vexpress_spc_get_freq_table(cluster, count); + + if (!table || !*count) { + pr_err("SPC controller returned invalid freq table"); + return NULL; + } + + return arm_bL_copy_table_from_array(table, *count); +} + +static void vexpress_put_freq_tbl(u32 cluster) +{ + arm_bL_free_freq_table(cluster); +} + +static struct cpufreq_arm_bL_ops vexpress_bL_ops = { + .name = "vexpress-bL", + .get_freq_tbl = vexpress_get_freq_tbl, + .put_freq_tbl = vexpress_put_freq_tbl, +}; + +static int vexpress_bL_init(void) +{ + if (!vexpress_spc_check_loaded()) { + pr_info("%s: No SPC found\n", __func__); + return -ENOENT; + } + + return bL_cpufreq_register(&vexpress_bL_ops); +} +module_init(vexpress_bL_init); + +static void vexpress_bL_exit(void) +{ + return bL_cpufreq_unregister(&vexpress_bL_ops); +} +module_exit(vexpress_bL_exit); + +MODULE_DESCRIPTION("ARM Vexpress big LITTLE cpufreq driver"); +MODULE_LICENSE("GPL"); |