/* SPDX-License-Identifier: GPL-2.0-only
*
* Copyright ( C ) 2020 - 21 Intel Corporation .
*/
#ifndef IOSM_IPC_IMEM_H
#define IOSM_IPC_IMEM_H
#include <linux/skbuff.h>
#include "iosm_ipc_mmio.h"
#include "iosm_ipc_pcie.h"
#include "iosm_ipc_uevent.h"
#include "iosm_ipc_wwan.h"
#include "iosm_ipc_task_queue.h"
struct ipc_chnl_cfg;
/* IRQ moderation in usec */
#define IRQ_MOD_OFF 0
#define IRQ_MOD_NET 1000
#define IRQ_MOD_TRC 4000
/* Either the PSI image is accepted by CP or the suspended flash tool is waken,
* informed that the CP ROM driver is not ready to process the PSI image .
* unit : milliseconds
*/
#define IPC_PSI_TRANSFER_TIMEOUT 3000
/* Timeout in 20 msec to wait for the modem to boot up to
* IPC_MEM_DEVICE_IPC_INIT state .
* unit : milliseconds ( 500 * ipc_util_msleep ( 20 ) )
*/
#define IPC_MODEM_BOOT_TIMEOUT 500
/* Wait timeout for ipc status reflects IPC_MEM_DEVICE_IPC_UNINIT
* unit : milliseconds
*/
#define IPC_MODEM_UNINIT_TIMEOUT_MS 30
/* Pending time for processing data.
* unit : milliseconds
*/
#define IPC_PEND_DATA_TIMEOUT 500
/* The timeout in milliseconds for application to wait for remote time. */
#define IPC_REMOTE_TS_TIMEOUT_MS 10
/* Timeout for TD allocation retry.
* unit : milliseconds
*/
#define IPC_TD_ALLOC_TIMER_PERIOD_MS 100
/* Host sleep target is host */
#define IPC_HOST_SLEEP_HOST 0
/* Host sleep target is device */
#define IPC_HOST_SLEEP_DEVICE 1
/* Sleep message, target host: AP enters sleep / target device: CP is
* allowed to enter sleep and shall use the host sleep protocol
*/
#define IPC_HOST_SLEEP_ENTER_SLEEP 0
/* Sleep_message, target host: AP exits sleep / target device: CP is
* NOT allowed to enter sleep
*/
#define IPC_HOST_SLEEP_EXIT_SLEEP 1
#define IMEM_IRQ_DONT_CARE (-1 )
#define IPC_MEM_MAX_CHANNELS 8
#define IPC_MEM_MUX_IP_SESSION_ENTRIES 8
#define IPC_MEM_MUX_IP_CH_IF_ID 0
#define TD_UPDATE_DEFAULT_TIMEOUT_USEC 1900
#define FORCE_UPDATE_DEFAULT_TIMEOUT_USEC 500
/* Sleep_message, target host: not applicable / target device: CP is
* allowed to enter sleep and shall NOT use the device sleep protocol
*/
#define IPC_HOST_SLEEP_ENTER_SLEEP_NO_PROTOCOL 2
/* in_band_crash_signal IPC_MEM_INBAND_CRASH_SIG
* Modem crash notification configuration . If this value is non - zero then
* FEATURE_SET message will be sent to the Modem as a result the Modem will
* signal Crash via Execution Stage register . If this value is zero then Modem
* will use out - of - band method to notify about it ' s Crash .
*/
#define IPC_MEM_INBAND_CRASH_SIG 1
/* Extra headroom to be allocated for DL SKBs to allow addition of Ethernet
* header
*/
#define IPC_MEM_DL_ETH_OFFSET 16
#define IPC_CB(skb) ((struct ipc_skb_cb *)((skb)->cb))
#define IOSM_CHIP_INFO_SIZE_MAX 100
#define FULLY_FUNCTIONAL 0
#define IOSM_DEVLINK_INIT 1
/* List of the supported UL/DL pipes. */
enum ipc_mem_pipes {
IPC_MEM_PIPE_0 = 0 ,
IPC_MEM_PIPE_1,
IPC_MEM_PIPE_2,
IPC_MEM_PIPE_3,
IPC_MEM_PIPE_4,
IPC_MEM_PIPE_5,
IPC_MEM_PIPE_6,
IPC_MEM_PIPE_7,
IPC_MEM_PIPE_8,
IPC_MEM_PIPE_9,
IPC_MEM_PIPE_10,
IPC_MEM_PIPE_11,
IPC_MEM_PIPE_12,
IPC_MEM_PIPE_13,
IPC_MEM_PIPE_14,
IPC_MEM_PIPE_15,
IPC_MEM_PIPE_16,
IPC_MEM_PIPE_17,
IPC_MEM_PIPE_18,
IPC_MEM_PIPE_19,
IPC_MEM_PIPE_20,
IPC_MEM_PIPE_21,
IPC_MEM_PIPE_22,
IPC_MEM_PIPE_23,
IPC_MEM_MAX_PIPES
};
/* Enum defining channel states. */
enum ipc_channel_state {
IMEM_CHANNEL_FREE,
IMEM_CHANNEL_RESERVED,
IMEM_CHANNEL_ACTIVE,
IMEM_CHANNEL_CLOSING,
};
/**
* enum ipc_ctype - Enum defining supported channel type needed for control
* / IP traffic .
* @ IPC_CTYPE_WWAN : Used for IP traffic
* @ IPC_CTYPE_CTRL : Used for Control Communication
*/
enum ipc_ctype {
IPC_CTYPE_WWAN,
IPC_CTYPE_CTRL,
};
/* Pipe direction. */
enum ipc_mem_pipe_dir {
IPC_MEM_DIR_UL,
IPC_MEM_DIR_DL,
};
/* HP update identifier. To be used as data for ipc_cp_irq_hpda_update() */
enum ipc_hp_identifier {
IPC_HP_MR = 0 ,
IPC_HP_PM_TRIGGER,
IPC_HP_WAKEUP_SPEC_TMR,
IPC_HP_TD_UPD_TMR_START,
IPC_HP_TD_UPD_TMR,
IPC_HP_FAST_TD_UPD_TMR,
IPC_HP_UL_WRITE_TD,
IPC_HP_DL_PROCESS,
IPC_HP_NET_CHANNEL_INIT,
IPC_HP_CDEV_OPEN,
};
/**
* struct ipc_pipe - Structure for Pipe .
* @ tdr_start : Ipc private protocol Transfer Descriptor Ring
* @ channel : Id of the sio device , set by imem_sio_open ,
* needed to pass DL char to the user terminal
* @ skbr_start : Circular buffer for skbuf and the buffer
* reference in a tdr_start entry .
* @ phy_tdr_start : Transfer descriptor start address
* @ old_head : last head pointer reported to CP .
* @ old_tail : AP read position before CP moves the read
* position to write / head . If CP has consumed the
* buffers , AP has to freed the skbuf starting at
* tdr_start [ old_tail ] .
* @ nr_of_entries : Number of elements of skb_start and tdr_start .
* @ max_nr_of_queued_entries : Maximum number of queued entries in TDR
* @ accumulation_backoff : Accumulation in usec for accumulation
* backoff ( 0 = no acc backoff )
* @ irq_moderation : timer in usec for irq_moderation
* ( 0 = no irq moderation )
* @ pipe_nr : Pipe identification number
* @ irq : Interrupt vector
* @ dir : Direction of data stream in pipe
* @ buf_size : Buffer size ( in bytes ) for preallocated
* buffers ( for DL pipes )
* @ nr_of_queued_entries : Aueued number of entries
* @ is_open : Check for open pipe status
*/
struct ipc_pipe {
struct ipc_protocol_td *tdr_start;
struct ipc_mem_channel *channel;
struct sk_buff **skbr_start;
dma_addr_t phy_tdr_start;
u32 old_head;
u32 old_tail;
u32 nr_of_entries;
u32 max_nr_of_queued_entries;
u32 accumulation_backoff;
u32 irq_moderation;
u32 pipe_nr;
u32 irq;
enum ipc_mem_pipe_dir dir;
u32 buf_size;
u16 nr_of_queued_entries;
u8 is_open:1 ;
};
/**
* struct ipc_mem_channel - Structure for Channel .
* @ channel_id : Instance of the channel list and is return to the user
* at the end of the open operation .
* @ ctype : Control or netif channel .
* @ index : unique index per ctype
* @ ul_pipe : pipe objects
* @ dl_pipe : pipe objects
* @ if_id : Interface ID
* @ net_err_count : Number of downlink errors returned by ipc_wwan_receive
* interface at the entry point of the IP stack .
* @ state : Free , reserved or busy ( in use ) .
* @ ul_sem : Needed for the blocking write or uplink transfer .
* @ ul_list : Uplink accumulator which is filled by the uplink
* char app or IP stack . The socket buffer pointer are
* added to the descriptor list in the kthread context .
*/
struct ipc_mem_channel {
int channel_id;
enum ipc_ctype ctype;
int index;
struct ipc_pipe ul_pipe;
struct ipc_pipe dl_pipe;
int if_id;
u32 net_err_count;
enum ipc_channel_state state;
struct completion ul_sem;
struct sk_buff_head ul_list;
};
/**
* enum ipc_phase - Different AP and CP phases .
* The enums defined after " IPC_P_ROM " and before
* " IPC_P_RUN " indicates the operating state where CP can
* respond to any requests . So while introducing new phase
* this shall be taken into consideration .
* @ IPC_P_OFF : On host PC , the PCIe device link settings are known
* about the combined power on . PC is running , the driver
* is loaded and CP is in power off mode . The PCIe bus
* driver call the device power mode D3hot . In this phase
* the driver the polls the device , until the device is in
* the power on state and signals the power mode D0 .
* @ IPC_P_OFF_REQ : The intermediate phase between cleanup activity starts
* and ends .
* @ IPC_P_CRASH : The phase indicating CP crash
* @ IPC_P_CD_READY : The phase indicating CP core dump is ready
* @ IPC_P_ROM : After power on , CP starts in ROM mode and the IPC ROM
* driver is waiting 150 ms for the AP active notification
* saved in the PCI link status register .
* @ IPC_P_PSI : Primary signed image download phase
* @ IPC_P_EBL : Extended bootloader pahse
* @ IPC_P_RUN : The phase after flashing to RAM is the RUNTIME phase .
*/
enum ipc_phase {
IPC_P_OFF,
IPC_P_OFF_REQ,
IPC_P_CRASH,
IPC_P_CD_READY,
IPC_P_ROM,
IPC_P_PSI,
IPC_P_EBL,
IPC_P_RUN,
};
/**
* struct iosm_imem - Current state of the IPC shared memory .
* @ mmio : mmio instance to access CP MMIO area /
* doorbell scratchpad .
* @ ipc_protocol : IPC Protocol instance
* @ ipc_task : Task for entry into ipc task queue
* @ wwan : WWAN device pointer
* @ mux : IP Data multiplexing state .
* @ sio : IPC SIO data structure pointer
* @ ipc_port : IPC PORT data structure pointer
* @ pcie : IPC PCIe
* @ trace : IPC trace data structure pointer
* @ dev : Pointer to device structure
* @ ipc_requested_state : Expected IPC state on CP .
* @ channels : Channel list with UL / DL pipe pairs .
* @ ipc_devlink : IPC Devlink data structure pointer
* @ ipc_status : local ipc_status
* @ nr_of_channels : number of configured channels
* @ startup_timer : startup timer for NAND support .
* @ hrtimer_period : Hr timer period
* @ tdupdate_timer : Delay the TD update doorbell .
* @ fast_update_timer : forced head pointer update delay timer .
* @ td_alloc_timer : Timer for DL pipe TD allocation retry
* @ adb_timer : Timer for finishing the ADB .
* @ rom_exit_code : Mapped boot rom exit code .
* @ enter_runtime : 1 means the transition to runtime phase was
* executed .
* @ ul_pend_sem : Semaphore to wait / complete of UL TDs
* before closing pipe .
* @ app_notify_ul_pend : Signal app if UL TD is pending
* @ dl_pend_sem : Semaphore to wait / complete of DL TDs
* before closing pipe .
* @ app_notify_dl_pend : Signal app if DL TD is pending
* @ phase : Operating phase like runtime .
* @ pci_device_id : Device ID
* @ cp_version : CP version
* @ device_sleep : Device sleep state
* @ run_state_worker : Pointer to worker component for device
* setup operations to be called when modem
* reaches RUN state
* @ ev_irq_pending : 0 means inform the IPC tasklet to
* process the irq actions .
* @ flag : Flag to monitor the state of driver
* @ td_update_timer_suspended : if true then td update timer suspend
* @ ev_mux_net_transmit_pending : 0 means inform the IPC tasklet to pass
* @ reset_det_n : Reset detect flag
* @ pcie_wake_n : Pcie wake flag
* @ debugfs_wwan_dir : WWAN Debug FS directory entry
* @ debugfs_dir : Debug FS directory for driver - specific entries
*/
struct iosm_imem {
struct iosm_mmio *mmio;
struct iosm_protocol *ipc_protocol;
struct ipc_task *ipc_task;
struct iosm_wwan *wwan;
struct iosm_mux *mux;
struct iosm_cdev *ipc_port[IPC_MEM_MAX_CHANNELS];
struct iosm_pcie *pcie;
#ifdef CONFIG_WWAN_DEBUGFS
struct iosm_trace *trace;
#endif
struct device *dev;
enum ipc_mem_device_ipc_state ipc_requested_state;
struct ipc_mem_channel channels[IPC_MEM_MAX_CHANNELS];
struct iosm_devlink *ipc_devlink;
u32 ipc_status;
u32 nr_of_channels;
struct hrtimer startup_timer;
ktime_t hrtimer_period;
struct hrtimer tdupdate_timer;
struct hrtimer fast_update_timer;
struct hrtimer td_alloc_timer;
struct hrtimer adb_timer;
enum rom_exit_code rom_exit_code;
u32 enter_runtime;
struct completion ul_pend_sem;
u32 app_notify_ul_pend;
struct completion dl_pend_sem;
u32 app_notify_dl_pend;
enum ipc_phase phase;
u16 pci_device_id;
int cp_version;
int device_sleep;
struct work_struct run_state_worker;
u8 ev_irq_pending[IPC_IRQ_VECTORS];
unsigned long flag;
u8 td_update_timer_suspended:1 ,
ev_mux_net_transmit_pending:1 ,
reset_det_n:1 ,
pcie_wake_n:1 ;
#ifdef CONFIG_WWAN_DEBUGFS
struct dentry *debugfs_wwan_dir;
struct dentry *debugfs_dir;
#endif
};
/**
* ipc_imem_init - Initialize the shared memory region
* @ pcie : Pointer to core driver data - struct
* @ device_id : PCI device ID
* @ mmio : Pointer to the mmio area
* @ dev : Pointer to device structure
*
* Returns : Initialized imem pointer on success else NULL
*/
struct iosm_imem *ipc_imem_init(struct iosm_pcie *pcie, unsigned int device_id,
void __iomem *mmio, struct device *dev);
/**
* ipc_imem_pm_s2idle_sleep - Set PM variables to sleep / active for
* s2idle sleep / active
* @ ipc_imem : Pointer to imem data - struct
* @ sleep : Set PM Variable to sleep / active
*/
void ipc_imem_pm_s2idle_sleep(struct iosm_imem *ipc_imem, bool sleep);
/**
* ipc_imem_pm_suspend - The HAL shall ask the shared memory layer
* whether D3 is allowed .
* @ ipc_imem : Pointer to imem data - struct
*/
void ipc_imem_pm_suspend(struct iosm_imem *ipc_imem);
/**
* ipc_imem_pm_resume - The HAL shall inform the shared memory layer
* that the device is active .
* @ ipc_imem : Pointer to imem data - struct
*/
void ipc_imem_pm_resume(struct iosm_imem *ipc_imem);
/**
* ipc_imem_cleanup - Inform CP and free the shared memory resources .
* @ ipc_imem : Pointer to imem data - struct
*/
void ipc_imem_cleanup(struct iosm_imem *ipc_imem);
/**
* ipc_imem_irq_process - Shift the IRQ actions to the IPC thread .
* @ ipc_imem : Pointer to imem data - struct
* @ irq : Irq number
*/
void ipc_imem_irq_process(struct iosm_imem *ipc_imem, int irq);
/**
* imem_get_device_sleep_state - Get the device sleep state value .
* @ ipc_imem : Pointer to imem instance
*
* Returns : device sleep state
*/
int imem_get_device_sleep_state(struct iosm_imem *ipc_imem);
/**
* ipc_imem_td_update_timer_suspend - Updates the TD Update Timer suspend flag .
* @ ipc_imem : Pointer to imem data - struct
* @ suspend : Flag to update . If TRUE then HP update doorbell is triggered to
* device without any wait . If FALSE then HP update doorbell is
* delayed until timeout .
*/
void ipc_imem_td_update_timer_suspend(struct iosm_imem *ipc_imem, bool suspend);
/**
* ipc_imem_channel_close - Release the channel resources .
* @ ipc_imem : Pointer to imem data - struct
* @ channel_id : Channel ID to be cleaned up .
*/
void ipc_imem_channel_close(struct iosm_imem *ipc_imem, int channel_id);
/**
* ipc_imem_channel_alloc - Reserves a channel
* @ ipc_imem : Pointer to imem data - struct
* @ index : ID to lookup from the preallocated list .
* @ ctype : Channel type .
*
* Returns : Index on success and failure value on error
*/
int ipc_imem_channel_alloc(struct iosm_imem *ipc_imem, int index,
enum ipc_ctype ctype);
/**
* ipc_imem_channel_open - Establish the pipes .
* @ ipc_imem : Pointer to imem data - struct
* @ channel_id : Channel ID returned during alloc .
* @ db_id : Doorbell ID for trigger identifier .
*
* Returns : Pointer of ipc_mem_channel on success and NULL on failure .
*/
struct ipc_mem_channel *ipc_imem_channel_open(struct iosm_imem *ipc_imem,
int channel_id, u32 db_id);
/**
* ipc_imem_td_update_timer_start - Starts the TD Update Timer if not running .
* @ ipc_imem : Pointer to imem data - struct
*/
void ipc_imem_td_update_timer_start(struct iosm_imem *ipc_imem);
/**
* ipc_imem_ul_write_td - Pass the channel UL list to protocol layer for TD
* preparation and sending them to the device .
* @ ipc_imem : Pointer to imem data - struct
*
* Returns : TRUE of HP Doorbell trigger is pending . FALSE otherwise .
*/
bool ipc_imem_ul_write_td(struct iosm_imem *ipc_imem);
/**
* ipc_imem_ul_send - Dequeue SKB from channel list and start with
* the uplink transfer . If HP Doorbell is pending to be
* triggered then starts the TD Update Timer .
* @ ipc_imem : Pointer to imem data - struct
*/
void ipc_imem_ul_send(struct iosm_imem *ipc_imem);
/**
* ipc_imem_channel_update - Set or modify pipe config of an existing channel
* @ ipc_imem : Pointer to imem data - struct
* @ id : Channel config index
* @ chnl_cfg : Channel config struct
* @ irq_moderation : Timer in usec for irq_moderation
*/
void ipc_imem_channel_update(struct iosm_imem *ipc_imem, int id,
struct ipc_chnl_cfg chnl_cfg, u32 irq_moderation);
/**
* ipc_imem_channel_free - Free an IPC channel .
* @ channel : Channel to be freed
*/
void ipc_imem_channel_free(struct ipc_mem_channel *channel);
/**
* ipc_imem_hrtimer_stop - Stop the hrtimer
* @ hr_timer : Pointer to hrtimer instance
*/
void ipc_imem_hrtimer_stop(struct hrtimer *hr_timer);
/**
* ipc_imem_pipe_cleanup - Reset volatile pipe content for all channels
* @ ipc_imem : Pointer to imem data - struct
* @ pipe : Pipe to cleaned up
*/
void ipc_imem_pipe_cleanup(struct iosm_imem *ipc_imem, struct ipc_pipe *pipe);
/**
* ipc_imem_pipe_close - Send msg to device to close pipe
* @ ipc_imem : Pointer to imem data - struct
* @ pipe : Pipe to be closed
*/
void ipc_imem_pipe_close(struct iosm_imem *ipc_imem, struct ipc_pipe *pipe);
/**
* ipc_imem_phase_update - Get the CP execution state
* and map it to the AP phase .
* @ ipc_imem : Pointer to imem data - struct
*
* Returns : Current ap updated phase
*/
enum ipc_phase ipc_imem_phase_update(struct iosm_imem *ipc_imem);
/**
* ipc_imem_phase_get_string - Return the current operation
* phase as string .
* @ phase : AP phase
*
* Returns : AP phase string
*/
const char *ipc_imem_phase_get_string(enum ipc_phase phase);
/**
* ipc_imem_msg_send_feature_set - Send feature set message to modem
* @ ipc_imem : Pointer to imem data - struct
* @ reset_enable : 0 = out - of - band , 1 = in - band - crash notification
* @ atomic_ctx : if disabled call in tasklet context
*
*/
void ipc_imem_msg_send_feature_set(struct iosm_imem *ipc_imem,
unsigned int reset_enable, bool atomic_ctx);
/**
* ipc_imem_ipc_init_check - Send the init event to CP , wait a certain time and
* set CP to runtime with the context information
* @ ipc_imem : Pointer to imem data - struct
*/
void ipc_imem_ipc_init_check(struct iosm_imem *ipc_imem);
/**
* ipc_imem_channel_init - Initialize the channel list with UL / DL pipe pairs .
* @ ipc_imem : Pointer to imem data - struct
* @ ctype : Channel type
* @ chnl_cfg : Channel configuration struct
* @ irq_moderation : Timer in usec for irq_moderation
*/
void ipc_imem_channel_init(struct iosm_imem *ipc_imem, enum ipc_ctype ctype,
struct ipc_chnl_cfg chnl_cfg, u32 irq_moderation);
/**
* ipc_imem_devlink_trigger_chip_info - Inform devlink that the chip
* information are available if the
* flashing to RAM interworking shall be
* executed .
* @ ipc_imem : Pointer to imem structure
*
* Returns : 0 on success , - 1 on failure
*/
int ipc_imem_devlink_trigger_chip_info(struct iosm_imem *ipc_imem);
void ipc_imem_adb_timer_start(struct iosm_imem *ipc_imem);
#endif
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