Hi Lina,
Compilation breaks while I try to compile these driver. Find below the
comments.
On Tuesday 19 August 2014 03:53 AM, Lina Iyer wrote:
> Add cpuidle driver interface to allow cpus to go into C-States.
> Use the cpuidle DT interfacecommon across ARM architectures to provide
> the C-State information to the cpuidle framework.
>
> Signed-off-by: Lina Iyer <lina.i...@linaro.org>
> ---
> drivers/cpuidle/Kconfig.arm | 7 +++
> drivers/cpuidle/Makefile | 1 +
> drivers/cpuidle/cpuidle-qcom.c | 119
> +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 127 insertions(+)
> create mode 100644 drivers/cpuidle/cpuidle-qcom.c
>
> diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm
> index e339c7f..26e31bd 100644
> --- a/drivers/cpuidle/Kconfig.arm
> +++ b/drivers/cpuidle/Kconfig.arm
> @@ -63,3 +63,10 @@ config ARM_MVEBU_V7_CPUIDLE
> depends on ARCH_MVEBU
> help
> Select this to enable cpuidle on Armada 370, 38x and XP processors.
> +
> +config ARM_QCOM_CPUIDLE
> + bool "CPU Idle drivers for Qualcomm processors"
> + depends on QCOM_PM
> + select DT_IDLE_STATES
I see no reference to this in any patch? Moreover it was not there in
v2. Anything new that you missed to add?
> + help
> + Select this to enable cpuidle for QCOM processors
> diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile
> index 4d177b9..6c222d5 100644
> --- a/drivers/cpuidle/Makefile
> +++ b/drivers/cpuidle/Makefile
> @@ -17,6 +17,7 @@ obj-$(CONFIG_ARM_ZYNQ_CPUIDLE) +=
> cpuidle-zynq.o
> obj-$(CONFIG_ARM_U8500_CPUIDLE) += cpuidle-ux500.o
> obj-$(CONFIG_ARM_AT91_CPUIDLE) += cpuidle-at91.o
> obj-$(CONFIG_ARM_EXYNOS_CPUIDLE) += cpuidle-exynos.o
> +obj-$(CONFIG_ARM_QCOM_CPUIDLE) += cpuidle-qcom.o
>
>
> ###############################################################################
> # MIPS drivers
> diff --git a/drivers/cpuidle/cpuidle-qcom.c b/drivers/cpuidle/cpuidle-qcom.c
> new file mode 100644
> index 0000000..4aae672
> --- /dev/null
> +++ b/drivers/cpuidle/cpuidle-qcom.c
> @@ -0,0 +1,119 @@
> +/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
> + * Copyright (c) 2014, Linaro Limited.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU G./8.patch:226:+eneral Public License
> version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * 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/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/cpuidle.h>
> +#include <linux/cpumask.h>
> +#include <linux/slab.h>
> +#include <linux/of_device.h>
> +
> +#include <soc/qcom/pm.h>
> +#include "dt_idle_states.h"
Did you miss to commit this file? Compilation fails as this file is nowhere.
> +
> +static enum msm_pm_sleep_mode modes[CPUIDLE_STATE_MAX];
> +
> +static int qcom_lpm_enter(struct cpuidle_device *dev,
> + struct cpuidle_driver *drv, int index)
> +{
> + return msm_cpu_pm_enter_sleep(modes[index], true);
> +}
> +
> +static struct cpuidle_driver qcom_cpuidle_driver = {
> + .name = "qcom_cpuidle",
> + .owner = THIS_MODULE,
> +};
> +
> +static void parse_state_translations(struct cpuidle_driver *drv)
> +{
> + struct device_node *state_node, *cpu_node;
> + const char *mode_name;
> + int i, j;
> +
> + struct name_map {
> + enum msm_pm_sleep_mode mode;
> + char *name;
> + };
> + static struct name_map c_states[] = {
> + { MSM_PM_SLEEP_MODE_POWER_COLLAPSE_STANDALONE,
> + "standalone-pc" },
> + { MSM_PM_SLEEP_MODE_WAIT_FOR_INTERRUPT, "wfi" },
> + };
> +
> + cpu_node = of_cpu_device_node_get(cpumask_first(drv->cpumask));
> + if (!cpu_node)
> + return;
> +
> + /**
> + * Get the state description from idle-state node entry-method
> + * First state is always WFI, per spec.
> + */
> + modes[0] = MSM_PM_SLEEP_MODE_WAIT_FOR_INTERRUPT;
> + for (i = 1; i < drv->state_count; i++) {
> + mode_name = NULL;
> + state_node = of_parse_phandle(cpu_node, "cpu-idle-states", i);
> + of_property_read_string(state_node, "entry-method",
> + &mode_name);
> + for (j = 0; mode_name && (j < ARRAY_SIZE(c_states)); j++) {
> + if (!strcmp(mode_name, c_states[j].name)) {
> + modes[i] = c_states[j].mode;
> + break;
> + }
> + }
> + }
> +}
> +
> +static int qcom_cpuidle_init(void)
> +{
> + struct cpuidle_driver *drv = &qcom_cpuidle_driver;
> + int ret;
> + int i;
> +
> + drv->cpumask = kzalloc(cpumask_size(), GFP_KERNEL);
> + if (!drv->cpumask)
> + return -ENOMEM;
> + cpumask_copy(drv->cpumask, cpu_possible_mask);
> +
> + /**
> + * Default to standard for WFI (index = 0)
> + * Probe only for other states
> + */
> + ret = dt_init_idle_driver(drv, 1);
There is no reference to this function as well.
> + if (ret < 0) {
> + pr_err("%s: failed to initialize idle states\n", __func__);
> + goto failed;
> + }
> +
> + /* Parse the idle states for C-States on this cpu */
> + parse_state_translations(drv);
> +
> + /* Register entry point for all low states */
> + for (i = 0; i < drv->state_count; i++)
> + drv->states[i].enter = qcom_lpm_enter;
> + drv->safe_state_index = 0;
> +
> + ret = cpuidle_register(drv, NULL);
> + if (ret) {
> + pr_err("%s: failed to register cpuidle driver\n", __func__);
> + goto failed;
> + }
> +
> + return 0;
> +
> +failed:
> + kfree(drv->cpumask);
> + return ret;
> +}
> +module_init(qcom_cpuidle_init);
>
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