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bus: mhi: core: Add support for basic PM operations

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This commit adds support for basic MHI PM operations such as
mhi_async_power_up, mhi_sync_power_up, and mhi_power_down. These
routines places the MHI bus into respective power domain states
and calls the state_transition APIs when necessary. The MHI
controller driver is expected to call these PM routines for
MHI powerup and powerdown.

This is based on the patch submitted by Sujeev Dias:
https://lkml.org/lkml/2018/7/9/989

Signed-off-by: Sujeev Dias <sdias@codeaurora.org>
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>
[mani: splitted the pm patch and cleaned up for upstream]
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org>
Tested-by: Jeffrey Hugo <jhugo@codeaurora.org>
Link: https://lore.kernel.org/r/20200220095854.4804-8-manivannan.sadhasivam@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Manivannan Sadhasivam
2020-02-20 15:28:45 +05:30
committed by Greg Kroah-Hartman
parent a6e2e3522f
commit 3000f85b8f
7 changed files with 801 additions and 1 deletions
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51
include/linux/mhi.h
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@@ -81,6 +81,17 @@ enum mhi_ch_type {
MHI_CH_TYPE_INBOUND_COALESCED = 3,
};
/**
* struct image_info - Firmware and RDDM table table
* @mhi_buf - Buffer for firmware and RDDM table
* @entries - # of entries in table
*/
struct image_info {
struct mhi_buf *mhi_buf;
struct bhi_vec_entry *bhi_vec;
u32 entries;
};
/**
* enum mhi_ee_type - Execution environment types
* @MHI_EE_PBL: Primary Bootloader
@@ -266,6 +277,7 @@ struct mhi_controller_config {
* @mhi_dev: MHI device instance for the controller
* @regs: Base address of MHI MMIO register space (required)
* @bhi: Points to base of MHI BHI register space
* @bhie: Points to base of MHI BHIe register space
* @wake_db: MHI WAKE doorbell register address
* @iova_start: IOMMU starting address for data (required)
* @iova_stop: IOMMU stop address for data (required)
@@ -273,6 +285,7 @@ struct mhi_controller_config {
* @edl_image: Firmware image name for emergency download mode (optional)
* @sbl_size: SBL image size downloaded through BHIe (optional)
* @seg_len: BHIe vector size (optional)
* @fbc_image: Points to firmware image buffer
* @mhi_chan: Points to the channel configuration table
* @lpm_chans: List of channels that require LPM notifications
* @irq: base irq # to request (required)
@@ -323,6 +336,7 @@ struct mhi_controller {
struct mhi_device *mhi_dev;
void __iomem *regs;
void __iomem *bhi;
void __iomem *bhie;
void __iomem *wake_db;
dma_addr_t iova_start;
@@ -331,6 +345,7 @@ struct mhi_controller {
const char *edl_image;
size_t sbl_size;
size_t seg_len;
struct image_info *fbc_image;
struct mhi_chan *mhi_chan;
struct list_head lpm_chans;
int *irq;
@@ -494,4 +509,40 @@ void mhi_driver_unregister(struct mhi_driver *mhi_drv);
void mhi_set_mhi_state(struct mhi_controller *mhi_cntrl,
enum mhi_state state);
/**
* mhi_prepare_for_power_up - Do pre-initialization before power up.
* This is optional, call this before power up if
* the controller does not want bus framework to
* automatically free any allocated memory during
* shutdown process.
* @mhi_cntrl: MHI controller
*/
int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl);
/**
* mhi_async_power_up - Start MHI power up sequence
* @mhi_cntrl: MHI controller
*/
int mhi_async_power_up(struct mhi_controller *mhi_cntrl);
/**
* mhi_sync_power_up - Start MHI power up sequence and wait till the device
* device enters valid EE state
* @mhi_cntrl: MHI controller
*/
int mhi_sync_power_up(struct mhi_controller *mhi_cntrl);
/**
* mhi_power_down - Start MHI power down sequence
* @mhi_cntrl: MHI controller
* @graceful: Link is still accessible, so do a graceful shutdown process
*/
void mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful);
/**
* mhi_unprepare_after_power_down - Free any allocated memory after power down
* @mhi_cntrl: MHI controller
*/
void mhi_unprepare_after_power_down(struct mhi_controller *mhi_cntrl);
#endif /* _MHI_H_ */