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WWAN device is programmed to boot in normal mode or fastboot mode,
when triggering a device reset through ACPI call or fastboot switch
command. Maintain state machine synchronization and reprobe logic
after a device reset.
The PCIe device reset triggered by several ways.
E.g.:
- fastboot: echo "fastboot_switching" > /sys/bus/pci/devices/${bdf}/t7xx_mode.
- reset: echo "reset" > /sys/bus/pci/devices/${bdf}/t7xx_mode.
- IRQ: PCIe device request driver to reset itself by an interrupt request.
Use pci_reset_function() as a generic way to reset device, save and
restore the PCIe configuration before and after reset device to ensure
the reprobe process.
Suggestion from Bjorn:
Link: https://lore.kernel.org/all/20230127133034.GA1364550@bhelgaas/
Signed-off-by: Jinjian Song <jinjian.song@fibocom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only
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*
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* Copyright (c) 2021, MediaTek Inc.
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* Copyright (c) 2021-2022, Intel Corporation.
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*
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* Authors:
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* Haijun Liu <haijun.liu@mediatek.com>
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* Eliot Lee <eliot.lee@intel.com>
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* Moises Veleta <moises.veleta@intel.com>
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* Ricardo Martinez <ricardo.martinez@linux.intel.com>
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*
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* Contributors:
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* Amir Hanania <amir.hanania@intel.com>
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* Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com>
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* Sreehari Kancharla <sreehari.kancharla@intel.com>
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*/
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#ifndef __T7XX_MODEM_OPS_H__
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#define __T7XX_MODEM_OPS_H__
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <linux/workqueue.h>
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#include "t7xx_hif_cldma.h"
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#include "t7xx_pci.h"
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#define FEATURE_COUNT 64
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/**
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* enum hif_ex_stage - HIF exception handshake stages with the HW.
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* @HIF_EX_INIT: Disable and clear TXQ.
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* @HIF_EX_INIT_DONE: Polling for initialization to be done.
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* @HIF_EX_CLEARQ_DONE: Disable RX, flush TX/RX workqueues and clear RX.
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* @HIF_EX_ALLQ_RESET: HW is back in safe mode for re-initialization and restart.
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*/
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enum hif_ex_stage {
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HIF_EX_INIT,
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HIF_EX_INIT_DONE,
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HIF_EX_CLEARQ_DONE,
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HIF_EX_ALLQ_RESET,
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};
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struct mtk_runtime_feature {
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u8 feature_id;
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u8 support_info;
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u8 reserved[2];
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__le32 data_len;
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__le32 data[];
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};
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enum md_event_id {
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FSM_PRE_START,
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FSM_START,
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FSM_READY,
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};
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struct t7xx_sys_info {
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bool ready;
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bool handshake_ongoing;
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u8 feature_set[FEATURE_COUNT];
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struct t7xx_port *ctl_port;
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};
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struct t7xx_modem {
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struct cldma_ctrl *md_ctrl[CLDMA_NUM];
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struct t7xx_pci_dev *t7xx_dev;
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struct t7xx_sys_info core_md;
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struct t7xx_sys_info core_ap;
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bool md_init_finish;
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bool rgu_irq_asserted;
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struct workqueue_struct *handshake_wq;
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struct work_struct handshake_work;
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struct work_struct ap_handshake_work;
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struct t7xx_fsm_ctl *fsm_ctl;
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struct port_proxy *port_prox;
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unsigned int exp_id;
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spinlock_t exp_lock; /* Protects exception events */
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};
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enum reset_type {
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FLDR,
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PLDR,
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FASTBOOT,
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};
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void t7xx_md_exception_handshake(struct t7xx_modem *md);
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void t7xx_md_event_notify(struct t7xx_modem *md, enum md_event_id evt_id);
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int t7xx_md_reset(struct t7xx_pci_dev *t7xx_dev);
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int t7xx_md_init(struct t7xx_pci_dev *t7xx_dev);
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void t7xx_md_exit(struct t7xx_pci_dev *t7xx_dev);
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void t7xx_clear_rgu_irq(struct t7xx_pci_dev *t7xx_dev);
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int t7xx_reset_device(struct t7xx_pci_dev *t7xx_dev, enum reset_type type);
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int t7xx_pci_mhccif_isr(struct t7xx_pci_dev *t7xx_dev);
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#endif /* __T7XX_MODEM_OPS_H__ */
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