| Message ID | 1381931563-16785-5-git-send-email-Sudeep.KarkadaNagesha@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, 16 Oct 2013, Sudeep KarkadaNagesha wrote: > From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com> > > The TC2(i.e. CA15_A7) Versatile Express has external Cortex M3 based > power controller which is responsible for CPU DVFS and SPC provides > the interface for the same. > > This patch adds a tiny interface driver to check if OPPs are > initialised by SPC platform code and register the arm_big_little > cpufreq driver. > > Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com> > Cc: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Nicolas Pitre <nico@linaro.org> > --- > drivers/cpufreq/Kconfig.arm | 8 ++++ > drivers/cpufreq/Makefile | 1 + > drivers/cpufreq/vexpress-spc-cpufreq.c | 69 ++++++++++++++++++++++++++++++++++ > 3 files changed, 78 insertions(+) > create mode 100644 drivers/cpufreq/vexpress-spc-cpufreq.c > > diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm > index 0fa204b..d3bf733 100644 > --- a/drivers/cpufreq/Kconfig.arm > +++ b/drivers/cpufreq/Kconfig.arm > @@ -235,3 +235,11 @@ config ARM_TEGRA_CPUFREQ > default y > help > This adds the CPUFreq driver support for TEGRA SOCs. > + > +config ARM_VEXPRESS_SPC_CPUFREQ > + tristate "Versatile Express SPC based CPUfreq driver" > + select ARM_BIG_LITTLE_CPUFREQ > + depends on ARCH_VEXPRESS_TC2_PM > + help > + This add the CPUfreq driver support for Versatile Express > + big.LITTLE platforms using SPC for power management. > diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile > index ad5866c..a1c390f 100644 > --- a/drivers/cpufreq/Makefile > +++ b/drivers/cpufreq/Makefile > @@ -77,6 +77,7 @@ obj-$(CONFIG_ARM_SA1100_CPUFREQ) += sa1100-cpufreq.o > obj-$(CONFIG_ARM_SA1110_CPUFREQ) += sa1110-cpufreq.o > obj-$(CONFIG_ARM_SPEAR_CPUFREQ) += spear-cpufreq.o > obj-$(CONFIG_ARM_TEGRA_CPUFREQ) += tegra-cpufreq.o > +obj-$(CONFIG_ARM_VEXPRESS_SPC_CPUFREQ) += vexpress-spc-cpufreq.o > > ################################################################################## > # PowerPC platform drivers > diff --git a/drivers/cpufreq/vexpress-spc-cpufreq.c b/drivers/cpufreq/vexpress-spc-cpufreq.c > new file mode 100644 > index 0000000..f0508bf > --- /dev/null > +++ b/drivers/cpufreq/vexpress-spc-cpufreq.c > @@ -0,0 +1,69 @@ > +/* > + * Versatile Express SPC CPUFreq Interface driver > + * > + * It provides necessary ops to arm_big_little cpufreq driver. > + * > + * Copyright (C) 2013 ARM Ltd. > + * Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com> > + * > + * 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/opp.h> > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include <linux/types.h> > +#include "arm_big_little.h" > + > +static int ve_spc_init_opp_table(struct device *cpu_dev) > +{ > + /* > + * platform specific SPC code must initialise the opp table > + * so just check if the OPP count is non-zero > + */ > + return opp_get_opp_count(cpu_dev) <= 0; > +} > + > +static int ve_spc_get_transition_latency(struct device *cpu_dev) > +{ > + return 1000000; /* 1 ms */ > +} > + > +static struct cpufreq_arm_bL_ops ve_spc_cpufreq_ops = { > + .name = "vexpress-spc", > + .get_transition_latency = ve_spc_get_transition_latency, > + .init_opp_table = ve_spc_init_opp_table, > +}; > + > +static int ve_spc_cpufreq_probe(struct platform_device *pdev) > +{ > + return bL_cpufreq_register(&ve_spc_cpufreq_ops); > +} > + > +static int ve_spc_cpufreq_remove(struct platform_device *pdev) > +{ > + bL_cpufreq_unregister(&ve_spc_cpufreq_ops); > + return 0; > +} > + > +static struct platform_driver ve_spc_cpufreq_platdrv = { > + .driver = { > + .name = "vexpress-spc-cpufreq", > + .owner = THIS_MODULE, > + }, > + .probe = ve_spc_cpufreq_probe, > + .remove = ve_spc_cpufreq_remove, > +}; > +module_platform_driver(ve_spc_cpufreq_platdrv); > + > +MODULE_LICENSE("GPL"); > -- > 1.8.1.2 >
diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm index 0fa204b..d3bf733 100644 --- a/drivers/cpufreq/Kconfig.arm +++ b/drivers/cpufreq/Kconfig.arm @@ -235,3 +235,11 @@ config ARM_TEGRA_CPUFREQ default y help This adds the CPUFreq driver support for TEGRA SOCs. + +config ARM_VEXPRESS_SPC_CPUFREQ + tristate "Versatile Express SPC based CPUfreq driver" + select ARM_BIG_LITTLE_CPUFREQ + depends on ARCH_VEXPRESS_TC2_PM + help + This add the CPUfreq driver support for Versatile Express + big.LITTLE platforms using SPC for power management. diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile index ad5866c..a1c390f 100644 --- a/drivers/cpufreq/Makefile +++ b/drivers/cpufreq/Makefile @@ -77,6 +77,7 @@ obj-$(CONFIG_ARM_SA1100_CPUFREQ) += sa1100-cpufreq.o obj-$(CONFIG_ARM_SA1110_CPUFREQ) += sa1110-cpufreq.o obj-$(CONFIG_ARM_SPEAR_CPUFREQ) += spear-cpufreq.o obj-$(CONFIG_ARM_TEGRA_CPUFREQ) += tegra-cpufreq.o +obj-$(CONFIG_ARM_VEXPRESS_SPC_CPUFREQ) += vexpress-spc-cpufreq.o ################################################################################## # PowerPC platform drivers diff --git a/drivers/cpufreq/vexpress-spc-cpufreq.c b/drivers/cpufreq/vexpress-spc-cpufreq.c new file mode 100644 index 0000000..f0508bf --- /dev/null +++ b/drivers/cpufreq/vexpress-spc-cpufreq.c @@ -0,0 +1,69 @@ +/* + * Versatile Express SPC CPUFreq Interface driver + * + * It provides necessary ops to arm_big_little cpufreq driver. + * + * Copyright (C) 2013 ARM Ltd. + * Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com> + * + * 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/opp.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/types.h> +#include "arm_big_little.h" + +static int ve_spc_init_opp_table(struct device *cpu_dev) +{ + /* + * platform specific SPC code must initialise the opp table + * so just check if the OPP count is non-zero + */ + return opp_get_opp_count(cpu_dev) <= 0; +} + +static int ve_spc_get_transition_latency(struct device *cpu_dev) +{ + return 1000000; /* 1 ms */ +} + +static struct cpufreq_arm_bL_ops ve_spc_cpufreq_ops = { + .name = "vexpress-spc", + .get_transition_latency = ve_spc_get_transition_latency, + .init_opp_table = ve_spc_init_opp_table, +}; + +static int ve_spc_cpufreq_probe(struct platform_device *pdev) +{ + return bL_cpufreq_register(&ve_spc_cpufreq_ops); +} + +static int ve_spc_cpufreq_remove(struct platform_device *pdev) +{ + bL_cpufreq_unregister(&ve_spc_cpufreq_ops); + return 0; +} + +static struct platform_driver ve_spc_cpufreq_platdrv = { + .driver = { + .name = "vexpress-spc-cpufreq", + .owner = THIS_MODULE, + }, + .probe = ve_spc_cpufreq_probe, + .remove = ve_spc_cpufreq_remove, +}; +module_platform_driver(ve_spc_cpufreq_platdrv); + +MODULE_LICENSE("GPL");