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authorSudeep Holla <sudeep.holla@arm.com>2016-04-20 14:05:14 +0100
committerSudeep Holla <sudeep.holla@arm.com>2016-06-21 10:15:56 +0100
commit37a441dcd5f4db7f769fee50ba7a2c602903a052 (patch)
tree07481fae5bd7d12d2d88d3421b9bd54677b509da /drivers/firmware
parent8f1498c03d1503c8675a633e9f354041558cc459 (diff)
downloadlinux-37a441dcd5f4db7f769fee50ba7a2c602903a052.tar.bz2
firmware: arm_scpi: add support for device power state management
SCPI protocol supports device power state management. This deals with power states of various peripheral devices in the system other than the core compute subsystem. This patch adds support for the power state management of those peripheral devices. Tested-by: Mathieu Poirier <mathieu.poirier@linaro.org> Tested-by: Jon Medhurst <tixy@linaro.org> Reviewed-by: Jon Medhurst <tixy@linaro.org> Reviewed-by: Kevin Hilman <khilman@baylibre.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Diffstat (limited to 'drivers/firmware')
-rw-r--r--drivers/firmware/arm_scpi.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/firmware/arm_scpi.c b/drivers/firmware/arm_scpi.c
index 51c6db0774cc..438893762076 100644
--- a/drivers/firmware/arm_scpi.c
+++ b/drivers/firmware/arm_scpi.c
@@ -231,6 +231,11 @@ struct sensor_value {
__le32 hi_val;
} __packed;
+struct dev_pstate_set {
+ u16 dev_id;
+ u8 pstate;
+} __packed;
+
static struct scpi_drvinfo *scpi_info;
static int scpi_linux_errmap[SCPI_ERR_MAX] = {
@@ -537,6 +542,29 @@ static int scpi_sensor_get_value(u16 sensor, u64 *val)
return ret;
}
+static int scpi_device_get_power_state(u16 dev_id)
+{
+ int ret;
+ u8 pstate;
+ __le16 id = cpu_to_le16(dev_id);
+
+ ret = scpi_send_message(SCPI_CMD_GET_DEVICE_PWR_STATE, &id,
+ sizeof(id), &pstate, sizeof(pstate));
+ return ret ? ret : pstate;
+}
+
+static int scpi_device_set_power_state(u16 dev_id, u8 pstate)
+{
+ int stat;
+ struct dev_pstate_set dev_set = {
+ .dev_id = cpu_to_le16(dev_id),
+ .pstate = pstate,
+ };
+
+ return scpi_send_message(SCPI_CMD_SET_DEVICE_PWR_STATE, &dev_set,
+ sizeof(dev_set), &stat, sizeof(stat));
+}
+
static struct scpi_ops scpi_ops = {
.get_version = scpi_get_version,
.clk_get_range = scpi_clk_get_range,
@@ -548,6 +576,8 @@ static struct scpi_ops scpi_ops = {
.sensor_get_capability = scpi_sensor_get_capability,
.sensor_get_info = scpi_sensor_get_info,
.sensor_get_value = scpi_sensor_get_value,
+ .device_get_power_state = scpi_device_get_power_state,
+ .device_set_power_state = scpi_device_set_power_state,
};
struct scpi_ops *get_scpi_ops(void)