diff options
Diffstat (limited to 'drivers/bus/mhi/host/pci_generic.c')
| -rw-r--r-- | drivers/bus/mhi/host/pci_generic.c | 1226 |
1 files changed, 1226 insertions, 0 deletions
diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c new file mode 100644 index 000000000000..caa4ce28cf9e --- /dev/null +++ b/drivers/bus/mhi/host/pci_generic.c @@ -0,0 +1,1226 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * MHI PCI driver - MHI over PCI controller driver + * + * This module is a generic driver for registering MHI-over-PCI devices, + * such as PCIe QCOM modems. + * + * Copyright (C) 2020 Linaro Ltd <loic.poulain@linaro.org> + */ + +#include <linux/aer.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/mhi.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/pm_runtime.h> +#include <linux/timer.h> +#include <linux/workqueue.h> + +#define MHI_PCI_DEFAULT_BAR_NUM 0 + +#define MHI_POST_RESET_DELAY_MS 2000 + +#define HEALTH_CHECK_PERIOD (HZ * 2) + +/** + * struct mhi_pci_dev_info - MHI PCI device specific information + * @config: MHI controller configuration + * @name: name of the PCI module + * @fw: firmware path (if any) + * @edl: emergency download mode firmware path (if any) + * @bar_num: PCI base address register to use for MHI MMIO register space + * @dma_data_width: DMA transfer word size (32 or 64 bits) + * @mru_default: default MRU size for MBIM network packets + * @sideband_wake: Devices using dedicated sideband GPIO for wakeup instead + * of inband wake support (such as sdx24) + */ +struct mhi_pci_dev_info { + const struct mhi_controller_config *config; + const char *name; + const char *fw; + const char *edl; + unsigned int bar_num; + unsigned int dma_data_width; + unsigned int mru_default; + bool sideband_wake; +}; + +#define MHI_CHANNEL_CONFIG_UL(ch_num, ch_name, el_count, ev_ring) \ + { \ + .num = ch_num, \ + .name = ch_name, \ + .num_elements = el_count, \ + .event_ring = ev_ring, \ + .dir = DMA_TO_DEVICE, \ + .ee_mask = BIT(MHI_EE_AMSS), \ + .pollcfg = 0, \ + .doorbell = MHI_DB_BRST_DISABLE, \ + .lpm_notify = false, \ + .offload_channel = false, \ + .doorbell_mode_switch = false, \ + } \ + +#define MHI_CHANNEL_CONFIG_DL(ch_num, ch_name, el_count, ev_ring) \ + { \ + .num = ch_num, \ + .name = ch_name, \ + .num_elements = el_count, \ + .event_ring = ev_ring, \ + .dir = DMA_FROM_DEVICE, \ + .ee_mask = BIT(MHI_EE_AMSS), \ + .pollcfg = 0, \ + .doorbell = MHI_DB_BRST_DISABLE, \ + .lpm_notify = false, \ + .offload_channel = false, \ + .doorbell_mode_switch = false, \ + } + +#define MHI_CHANNEL_CONFIG_DL_AUTOQUEUE(ch_num, ch_name, el_count, ev_ring) \ + { \ + .num = ch_num, \ + .name = ch_name, \ + .num_elements = el_count, \ + .event_ring = ev_ring, \ + .dir = DMA_FROM_DEVICE, \ + .ee_mask = BIT(MHI_EE_AMSS), \ + .pollcfg = 0, \ + .doorbell = MHI_DB_BRST_DISABLE, \ + .lpm_notify = false, \ + .offload_channel = false, \ + .doorbell_mode_switch = false, \ + .auto_queue = true, \ + } + +#define MHI_EVENT_CONFIG_CTRL(ev_ring, el_count) \ + { \ + .num_elements = el_count, \ + .irq_moderation_ms = 0, \ + .irq = (ev_ring) + 1, \ + .priority = 1, \ + .mode = MHI_DB_BRST_DISABLE, \ + .data_type = MHI_ER_CTRL, \ + .hardware_event = false, \ + .client_managed = false, \ + .offload_channel = false, \ + } + +#define MHI_CHANNEL_CONFIG_HW_UL(ch_num, ch_name, el_count, ev_ring) \ + { \ + .num = ch_num, \ + .name = ch_name, \ + .num_elements = el_count, \ + .event_ring = ev_ring, \ + .dir = DMA_TO_DEVICE, \ + .ee_mask = BIT(MHI_EE_AMSS), \ + .pollcfg = 0, \ + .doorbell = MHI_DB_BRST_ENABLE, \ + .lpm_notify = false, \ + .offload_channel = false, \ + .doorbell_mode_switch = true, \ + } \ + +#define MHI_CHANNEL_CONFIG_HW_DL(ch_num, ch_name, el_count, ev_ring) \ + { \ + .num = ch_num, \ + .name = ch_name, \ + .num_elements = el_count, \ + .event_ring = ev_ring, \ + .dir = DMA_FROM_DEVICE, \ + .ee_mask = BIT(MHI_EE_AMSS), \ + .pollcfg = 0, \ + .doorbell = MHI_DB_BRST_ENABLE, \ + .lpm_notify = false, \ + .offload_channel = false, \ + .doorbell_mode_switch = true, \ + } + +#define MHI_CHANNEL_CONFIG_UL_SBL(ch_num, ch_name, el_count, ev_ring) \ + { \ + .num = ch_num, \ + .name = ch_name, \ + .num_elements = el_count, \ + .event_ring = ev_ring, \ + .dir = DMA_TO_DEVICE, \ + .ee_mask = BIT(MHI_EE_SBL), \ + .pollcfg = 0, \ + .doorbell = MHI_DB_BRST_DISABLE, \ + .lpm_notify = false, \ + .offload_channel = false, \ + .doorbell_mode_switch = false, \ + } \ + +#define MHI_CHANNEL_CONFIG_DL_SBL(ch_num, ch_name, el_count, ev_ring) \ + { \ + .num = ch_num, \ + .name = ch_name, \ + .num_elements = el_count, \ + .event_ring = ev_ring, \ + .dir = DMA_FROM_DEVICE, \ + .ee_mask = BIT(MHI_EE_SBL), \ + .pollcfg = 0, \ + .doorbell = MHI_DB_BRST_DISABLE, \ + .lpm_notify = false, \ + .offload_channel = false, \ + .doorbell_mode_switch = false, \ + } + +#define MHI_CHANNEL_CONFIG_UL_FP(ch_num, ch_name, el_count, ev_ring) \ + { \ + .num = ch_num, \ + .name = ch_name, \ + .num_elements = el_count, \ + .event_ring = ev_ring, \ + .dir = DMA_TO_DEVICE, \ + .ee_mask = BIT(MHI_EE_FP), \ + .pollcfg = 0, \ + .doorbell = MHI_DB_BRST_DISABLE, \ + .lpm_notify = false, \ + .offload_channel = false, \ + .doorbell_mode_switch = false, \ + } \ + +#define MHI_CHANNEL_CONFIG_DL_FP(ch_num, ch_name, el_count, ev_ring) \ + { \ + .num = ch_num, \ + .name = ch_name, \ + .num_elements = el_count, \ + .event_ring = ev_ring, \ + .dir = DMA_FROM_DEVICE, \ + .ee_mask = BIT(MHI_EE_FP), \ + .pollcfg = 0, \ + .doorbell = MHI_DB_BRST_DISABLE, \ + .lpm_notify = false, \ + .offload_channel = false, \ + .doorbell_mode_switch = false, \ + } + +#define MHI_EVENT_CONFIG_DATA(ev_ring, el_count) \ + { \ + .num_elements = el_count, \ + .irq_moderation_ms = 5, \ + .irq = (ev_ring) + 1, \ + .priority = 1, \ + .mode = MHI_DB_BRST_DISABLE, \ + .data_type = MHI_ER_DATA, \ + .hardware_event = false, \ + .client_managed = false, \ + .offload_channel = false, \ + } + +#define MHI_EVENT_CONFIG_HW_DATA(ev_ring, el_count, ch_num) \ + { \ + .num_elements = el_count, \ + .irq_moderation_ms = 1, \ + .irq = (ev_ring) + 1, \ + .priority = 1, \ + .mode = MHI_DB_BRST_DISABLE, \ + .data_type = MHI_ER_DATA, \ + .hardware_event = true, \ + .client_managed = false, \ + .offload_channel = false, \ + .channel = ch_num, \ + } + +static const struct mhi_channel_config modem_qcom_v1_mhi_channels[] = { + MHI_CHANNEL_CONFIG_UL(4, "DIAG", 16, 1), + MHI_CHANNEL_CONFIG_DL(5, "DIAG", 16, 1), + MHI_CHANNEL_CONFIG_UL(12, "MBIM", 4, 0), + MHI_CHANNEL_CONFIG_DL(13, "MBIM", 4, 0), + MHI_CHANNEL_CONFIG_UL(14, "QMI", 4, 0), + MHI_CHANNEL_CONFIG_DL(15, "QMI", 4, 0), + MHI_CHANNEL_CONFIG_UL(20, "IPCR", 8, 0), + MHI_CHANNEL_CONFIG_DL_AUTOQUEUE(21, "IPCR", 8, 0), + MHI_CHANNEL_CONFIG_UL_FP(34, "FIREHOSE", 32, 0), + MHI_CHANNEL_CONFIG_DL_FP(35, "FIREHOSE", 32, 0), + MHI_CHANNEL_CONFIG_HW_UL(100, "IP_HW0", 128, 2), + MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0", 128, 3), +}; + +static struct mhi_event_config modem_qcom_v1_mhi_events[] = { + /* first ring is control+data ring */ + MHI_EVENT_CONFIG_CTRL(0, 64), + /* DIAG dedicated event ring */ + MHI_EVENT_CONFIG_DATA(1, 128), + /* Hardware channels request dedicated hardware event rings */ + MHI_EVENT_CONFIG_HW_DATA(2, 1024, 100), + MHI_EVENT_CONFIG_HW_DATA(3, 2048, 101) +}; + +static const struct mhi_controller_config modem_qcom_v1_mhiv_config = { + .max_channels = 128, + .timeout_ms = 8000, + .num_channels = ARRAY_SIZE(modem_qcom_v1_mhi_channels), + .ch_cfg = modem_qcom_v1_mhi_channels, + .num_events = ARRAY_SIZE(modem_qcom_v1_mhi_events), + .event_cfg = modem_qcom_v1_mhi_events, +}; + +static const struct mhi_pci_dev_info mhi_qcom_sdx65_info = { + .name = "qcom-sdx65m", + .fw = "qcom/sdx65m/xbl.elf", + .edl = "qcom/sdx65m/edl.mbn", + .config = &modem_qcom_v1_mhiv_config, + .bar_num = MHI_PCI_DEFAULT_BAR_NUM, + .dma_data_width = 32, + .sideband_wake = false, +}; + +static const struct mhi_pci_dev_info mhi_qcom_sdx55_info = { + .name = "qcom-sdx55m", + .fw = "qcom/sdx55m/sbl1.mbn", + .edl = "qcom/sdx55m/edl.mbn", + .config = &modem_qcom_v1_mhiv_config, + .bar_num = MHI_PCI_DEFAULT_BAR_NUM, + .dma_data_width = 32, + .mru_default = 32768, + .sideband_wake = false, +}; + +static const struct mhi_pci_dev_info mhi_qcom_sdx24_info = { + .name = "qcom-sdx24", + .edl = "qcom/prog_firehose_sdx24.mbn", + .config = &modem_qcom_v1_mhiv_config, + .bar_num = MHI_PCI_DEFAULT_BAR_NUM, + .dma_data_width = 32, + .sideband_wake = true, +}; + +static const struct mhi_channel_config mhi_quectel_em1xx_channels[] = { + MHI_CHANNEL_CONFIG_UL(0, "NMEA", 32, 0), + MHI_CHANNEL_CONFIG_DL(1, "NMEA", 32, 0), + MHI_CHANNEL_CONFIG_UL_SBL(2, "SAHARA", 32, 0), + MHI_CHANNEL_CONFIG_DL_SBL(3, "SAHARA", 32, 0), + MHI_CHANNEL_CONFIG_UL(4, "DIAG", 32, 1), + MHI_CHANNEL_CONFIG_DL(5, "DIAG", 32, 1), + MHI_CHANNEL_CONFIG_UL(12, "MBIM", 32, 0), + MHI_CHANNEL_CONFIG_DL(13, "MBIM", 32, 0), + MHI_CHANNEL_CONFIG_UL(32, "DUN", 32, 0), + MHI_CHANNEL_CONFIG_DL(33, "DUN", 32, 0), + /* The EDL firmware is a flash-programmer exposing firehose protocol */ + MHI_CHANNEL_CONFIG_UL_FP(34, "FIREHOSE", 32, 0), + MHI_CHANNEL_CONFIG_DL_FP(35, "FIREHOSE", 32, 0), + MHI_CHANNEL_CONFIG_HW_UL(100, "IP_HW0_MBIM", 128, 2), + MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0_MBIM", 128, 3), +}; + +static struct mhi_event_config mhi_quectel_em1xx_events[] = { + MHI_EVENT_CONFIG_CTRL(0, 128), + MHI_EVENT_CONFIG_DATA(1, 128), + MHI_EVENT_CONFIG_HW_DATA(2, 1024, 100), + MHI_EVENT_CONFIG_HW_DATA(3, 1024, 101) +}; + +static const struct mhi_controller_config modem_quectel_em1xx_config = { + .max_channels = 128, + .timeout_ms = 20000, + .num_channels = ARRAY_SIZE(mhi_quectel_em1xx_channels), + .ch_cfg = mhi_quectel_em1xx_channels, + .num_events = ARRAY_SIZE(mhi_quectel_em1xx_events), + .event_cfg = mhi_quectel_em1xx_events, +}; + +static const struct mhi_pci_dev_info mhi_quectel_em1xx_info = { + .name = "quectel-em1xx", + .edl = "qcom/prog_firehose_sdx24.mbn", + .config = &modem_quectel_em1xx_config, + .bar_num = MHI_PCI_DEFAULT_BAR_NUM, + .dma_data_width = 32, + .mru_default = 32768, + .sideband_wake = true, +}; + +static const struct mhi_channel_config mhi_foxconn_sdx55_channels[] = { + MHI_CHANNEL_CONFIG_UL(0, "LOOPBACK", 32, 0), + MHI_CHANNEL_CONFIG_DL(1, "LOOPBACK", 32, 0), + MHI_CHANNEL_CONFIG_UL(4, "DIAG", 32, 1), + MHI_CHANNEL_CONFIG_DL(5, "DIAG", 32, 1), + MHI_CHANNEL_CONFIG_UL(12, "MBIM", 32, 0), + MHI_CHANNEL_CONFIG_DL(13, "MBIM", 32, 0), + MHI_CHANNEL_CONFIG_UL(32, "DUN", 32, 0), + MHI_CHANNEL_CONFIG_DL(33, "DUN", 32, 0), + MHI_CHANNEL_CONFIG_HW_UL(100, "IP_HW0_MBIM", 128, 2), + MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0_MBIM", 128, 3), +}; + +static struct mhi_event_config mhi_foxconn_sdx55_events[] = { + MHI_EVENT_CONFIG_CTRL(0, 128), + MHI_EVENT_CONFIG_DATA(1, 128), + MHI_EVENT_CONFIG_HW_DATA(2, 1024, 100), + MHI_EVENT_CONFIG_HW_DATA(3, 1024, 101) +}; + +static const struct mhi_controller_config modem_foxconn_sdx55_config = { + .max_channels = 128, + .timeout_ms = 20000, + .num_channels = ARRAY_SIZE(mhi_foxconn_sdx55_channels), + .ch_cfg = mhi_foxconn_sdx55_channels, + .num_events = ARRAY_SIZE(mhi_foxconn_sdx55_events), + .event_cfg = mhi_foxconn_sdx55_events, +}; + +static const struct mhi_pci_dev_info mhi_foxconn_sdx55_info = { + .name = "foxconn-sdx55", + .fw = "qcom/sdx55m/sbl1.mbn", + .edl = "qcom/sdx55m/edl.mbn", + .config = &modem_foxconn_sdx55_config, + .bar_num = MHI_PCI_DEFAULT_BAR_NUM, + .dma_data_width = 32, + .mru_default = 32768, + .sideband_wake = false, +}; + +static const struct mhi_pci_dev_info mhi_foxconn_sdx65_info = { + .name = "foxconn-sdx65", + .config = &modem_foxconn_sdx55_config, + .bar_num = MHI_PCI_DEFAULT_BAR_NUM, + .dma_data_width = 32, + .mru_default = 32768, + .sideband_wake = false, +}; + +static const struct mhi_channel_config mhi_mv3x_channels[] = { + MHI_CHANNEL_CONFIG_UL(0, "LOOPBACK", 64, 0), + MHI_CHANNEL_CONFIG_DL(1, "LOOPBACK", 64, 0), + /* MBIM Control Channel */ + MHI_CHANNEL_CONFIG_UL(12, "MBIM", 64, 0), + MHI_CHANNEL_CONFIG_DL(13, "MBIM", 64, 0), + /* MBIM Data Channel */ + MHI_CHANNEL_CONFIG_HW_UL(100, "IP_HW0_MBIM", 512, 2), + MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0_MBIM", 512, 3), +}; + +static struct mhi_event_config mhi_mv3x_events[] = { + MHI_EVENT_CONFIG_CTRL(0, 256), + MHI_EVENT_CONFIG_DATA(1, 256), + MHI_EVENT_CONFIG_HW_DATA(2, 1024, 100), + MHI_EVENT_CONFIG_HW_DATA(3, 1024, 101), +}; + +static const struct mhi_controller_config modem_mv3x_config = { + .max_channels = 128, + .timeout_ms = 20000, + .num_channels = ARRAY_SIZE(mhi_mv3x_channels), + .ch_cfg = mhi_mv3x_channels, + .num_events = ARRAY_SIZE(mhi_mv3x_events), + .event_cfg = mhi_mv3x_events, +}; + +static const struct mhi_pci_dev_info mhi_mv31_info = { + .name = "cinterion-mv31", + .config = &modem_mv3x_config, + .bar_num = MHI_PCI_DEFAULT_BAR_NUM, + .dma_data_width = 32, + .mru_default = 32768, +}; + +static const struct mhi_pci_dev_info mhi_mv32_info = { + .name = "cinterion-mv32", + .config = &modem_mv3x_config, + .bar_num = MHI_PCI_DEFAULT_BAR_NUM, + .dma_data_width = 32, + .mru_default = 32768, +}; + +static const struct mhi_channel_config mhi_sierra_em919x_channels[] = { + MHI_CHANNEL_CONFIG_UL_SBL(2, "SAHARA", 32, 0), + MHI_CHANNEL_CONFIG_DL_SBL(3, "SAHARA", 256, 0), + MHI_CHANNEL_CONFIG_UL(4, "DIAG", 32, 0), + MHI_CHANNEL_CONFIG_DL(5, "DIAG", 32, 0), + MHI_CHANNEL_CONFIG_UL(12, "MBIM", 128, 0), + MHI_CHANNEL_CONFIG_DL(13, "MBIM", 128, 0), + MHI_CHANNEL_CONFIG_UL(14, "QMI", 32, 0), + MHI_CHANNEL_CONFIG_DL(15, "QMI", 32, 0), + MHI_CHANNEL_CONFIG_UL(32, "DUN", 32, 0), + MHI_CHANNEL_CONFIG_DL(33, "DUN", 32, 0), + MHI_CHANNEL_CONFIG_HW_UL(100, "IP_HW0", 512, 1), + MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0", 512, 2), +}; + +static struct mhi_event_config modem_sierra_em919x_mhi_events[] = { + /* first ring is control+data and DIAG ring */ + MHI_EVENT_CONFIG_CTRL(0, 2048), + /* Hardware channels request dedicated hardware event rings */ + MHI_EVENT_CONFIG_HW_DATA(1, 2048, 100), + MHI_EVENT_CONFIG_HW_DATA(2, 2048, 101) +}; + +static const struct mhi_controller_config modem_sierra_em919x_config = { + .max_channels = 128, + .timeout_ms = 24000, + .num_channels = ARRAY_SIZE(mhi_sierra_em919x_channels), + .ch_cfg = mhi_sierra_em919x_channels, + .num_events = ARRAY_SIZE(modem_sierra_em919x_mhi_events), + .event_cfg = modem_sierra_em919x_mhi_events, +}; + +static const struct mhi_pci_dev_info mhi_sierra_em919x_info = { + .name = "sierra-em919x", + .config = &modem_sierra_em919x_config, + .bar_num = MHI_PCI_DEFAULT_BAR_NUM, + .dma_data_width = 32, + .sideband_wake = false, +}; + +static const struct mhi_channel_config mhi_telit_fn980_hw_v1_channels[] = { + MHI_CHANNEL_CONFIG_UL(14, "QMI", 32, 0), + MHI_CHANNEL_CONFIG_DL(15, "QMI", 32, 0), + MHI_CHANNEL_CONFIG_UL(20, "IPCR", 16, 0), + MHI_CHANNEL_CONFIG_DL_AUTOQUEUE(21, "IPCR", 16, 0), + MHI_CHANNEL_CONFIG_HW_UL(100, "IP_HW0", 128, 1), + MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0", 128, 2), +}; + +static struct mhi_event_config mhi_telit_fn980_hw_v1_events[] = { + MHI_EVENT_CONFIG_CTRL(0, 128), + MHI_EVENT_CONFIG_HW_DATA(1, 1024, 100), + MHI_EVENT_CONFIG_HW_DATA(2, 2048, 101) +}; + +static struct mhi_controller_config modem_telit_fn980_hw_v1_config = { + .max_channels = 128, + .timeout_ms = 20000, + .num_channels = ARRAY_SIZE(mhi_telit_fn980_hw_v1_channels), + .ch_cfg = mhi_telit_fn980_hw_v1_channels, + .num_events = ARRAY_SIZE(mhi_telit_fn980_hw_v1_events), + .event_cfg = mhi_telit_fn980_hw_v1_events, +}; + +static const struct mhi_pci_dev_info mhi_telit_fn980_hw_v1_info = { + .name = "telit-fn980-hwv1", + .fw = "qcom/sdx55m/sbl1.mbn", + .edl = "qcom/sdx55m/edl.mbn", + .config = &modem_telit_fn980_hw_v1_config, + .bar_num = MHI_PCI_DEFAULT_BAR_NUM, + .dma_data_width = 32, + .mru_default = 32768, + .sideband_wake = false, +}; + +static const struct mhi_channel_config mhi_telit_fn990_channels[] = { + MHI_CHANNEL_CONFIG_UL_SBL(2, "SAHARA", 32, 0), + MHI_CHANNEL_CONFIG_DL_SBL(3, "SAHARA", 32, 0), + MHI_CHANNEL_CONFIG_UL(4, "DIAG", 64, 1), + MHI_CHANNEL_CONFIG_DL(5, "DIAG", 64, 1), + MHI_CHANNEL_CONFIG_UL(12, "MBIM", 32, 0), + MHI_CHANNEL_CONFIG_DL(13, "MBIM", 32, 0), + MHI_CHANNEL_CONFIG_UL(32, "DUN", 32, 0), + MHI_CHANNEL_CONFIG_DL(33, "DUN", 32, 0), + MHI_CHANNEL_CONFIG_UL(92, "DUN2", 32, 1), + MHI_CHANNEL_CONFIG_DL(93, "DUN2", 32, 1), + MHI_CHANNEL_CONFIG_HW_UL(100, "IP_HW0_MBIM", 128, 2), + MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0_MBIM", 128, 3), +}; + +static struct mhi_event_config mhi_telit_fn990_events[] = { + MHI_EVENT_CONFIG_CTRL(0, 128), + MHI_EVENT_CONFIG_DATA(1, 128), + MHI_EVENT_CONFIG_HW_DATA(2, 1024, 100), + MHI_EVENT_CONFIG_HW_DATA(3, 2048, 101) +}; + +static const struct mhi_controller_config modem_telit_fn990_config = { + .max_channels = 128, + .timeout_ms = 20000, + .num_channels = ARRAY_SIZE(mhi_telit_fn990_channels), + .ch_cfg = mhi_telit_fn990_channels, + .num_events = ARRAY_SIZE(mhi_telit_fn990_events), + .event_cfg = mhi_telit_fn990_events, +}; + +static const struct mhi_pci_dev_info mhi_telit_fn990_info = { + .name = "telit-fn990", + .config = &modem_telit_fn990_config, + .bar_num = MHI_PCI_DEFAULT_BAR_NUM, + .dma_data_width = 32, + .sideband_wake = false, + .mru_default = 32768, +}; + +/* Keep the list sorted based on the PID. New VID should be added as the last entry */ +static const struct pci_device_id mhi_pci_id_table[] = { + { PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x0304), + .driver_data = (kernel_ulong_t) &mhi_qcom_sdx24_info }, + /* EM919x (sdx55), use the same vid:pid as qcom-sdx55m */ + { PCI_DEVICE_SUB(PCI_VENDOR_ID_QCOM, 0x0306, 0x18d7, 0x0200), + .driver_data = (kernel_ulong_t) &mhi_sierra_em919x_info }, + /* Telit FN980 hardware revision v1 */ + { PCI_DEVICE_SUB(PCI_VENDOR_ID_QCOM, 0x0306, 0x1C5D, 0x2000), + .driver_data = (kernel_ulong_t) &mhi_telit_fn980_hw_v1_info }, + { PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x0306), + .driver_data = (kernel_ulong_t) &mhi_qcom_sdx55_info }, + /* Telit FN990 */ + { PCI_DEVICE_SUB(PCI_VENDOR_ID_QCOM, 0x0308, 0x1c5d, 0x2010), + .driver_data = (kernel_ulong_t) &mhi_telit_fn990_info }, + { PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x0308), + .driver_data = (kernel_ulong_t) &mhi_qcom_sdx65_info }, + { PCI_DEVICE(0x1eac, 0x1001), /* EM120R-GL (sdx24) */ + .driver_data = (kernel_ulong_t) &mhi_quectel_em1xx_info }, + { PCI_DEVICE(0x1eac, 0x1002), /* EM160R-GL (sdx24) */ + .driver_data = (kernel_ulong_t) &mhi_quectel_em1xx_info }, + { PCI_DEVICE(0x1eac, 0x2001), /* EM120R-GL for FCCL (sdx24) */ + .driver_data = (kernel_ulong_t) &mhi_quectel_em1xx_info }, + /* T99W175 (sdx55), Both for eSIM and Non-eSIM */ + { PCI_DEVICE(PCI_VENDOR_ID_FOXCONN, 0xe0ab), + .driver_data = (kernel_ulong_t) &mhi_foxconn_sdx55_info }, + /* DW5930e (sdx55), With eSIM, It's also T99W175 */ + { PCI_DEVICE(PCI_VENDOR_ID_FOXCONN, 0xe0b0), + .driver_data = (kernel_ulong_t) &mhi_foxconn_sdx55_info }, + /* DW5930e (sdx55), Non-eSIM, It's also T99W175 */ + { PCI_DEVICE(PCI_VENDOR_ID_FOXCONN, 0xe0b1), + .driver_data = (kernel_ulong_t) &mhi_foxconn_sdx55_info }, + /* T99W175 (sdx55), Based on Qualcomm new baseline */ + { PCI_DEVICE(PCI_VENDOR_ID_FOXCONN, 0xe0bf), + .driver_data = (kernel_ulong_t) &mhi_foxconn_sdx55_info }, + /* T99W175 (sdx55) */ + { PCI_DEVICE(PCI_VENDOR_ID_FOXCONN, 0xe0c3), + .driver_data = (kernel_ulong_t) &mhi_foxconn_sdx55_info }, + /* T99W368 (sdx65) */ + { PCI_DEVICE(PCI_VENDOR_ID_FOXCONN, 0xe0d8), + .driver_data = (kernel_ulong_t) &mhi_foxconn_sdx65_info }, + /* T99W373 (sdx62) */ + { PCI_DEVICE(PCI_VENDOR_ID_FOXCONN, 0xe0d9), + .driver_data = (kernel_ulong_t) &mhi_foxconn_sdx65_info }, + /* MV31-W (Cinterion) */ + { PCI_DEVICE(0x1269, 0x00b3), + .driver_data = (kernel_ulong_t) &mhi_mv31_info }, + /* MV31-W (Cinterion), based on new baseline */ + { PCI_DEVICE(0x1269, 0x00b4), + .driver_data = (kernel_ulong_t) &mhi_mv31_info }, + /* MV32-WA (Cinterion) */ + { PCI_DEVICE(0x1269, 0x00ba), + .driver_data = (kernel_ulong_t) &mhi_mv32_info }, + /* MV32-WB (Cinterion) */ + { PCI_DEVICE(0x1269, 0x00bb), + .driver_data = (kernel_ulong_t) &mhi_mv32_info }, + { } +}; +MODULE_DEVICE_TABLE(pci, mhi_pci_id_table); + +enum mhi_pci_device_status { + MHI_PCI_DEV_STARTED, + MHI_PCI_DEV_SUSPENDED, +}; + +struct mhi_pci_device { + struct mhi_controller mhi_cntrl; + struct pci_saved_state *pci_state; + struct work_struct recovery_work; + struct timer_list health_check_timer; + unsigned long status; +}; + +static int mhi_pci_read_reg(struct mhi_controller *mhi_cntrl, + void __iomem *addr, u32 *out) +{ + *out = readl(addr); + return 0; +} + +static void mhi_pci_write_reg(struct mhi_controller *mhi_cntrl, + void __iomem *addr, u32 val) +{ + writel(val, addr); +} + +static void mhi_pci_status_cb(struct mhi_controller *mhi_cntrl, + enum mhi_callback cb) +{ + struct pci_dev *pdev = to_pci_dev(mhi_cntrl->cntrl_dev); + + /* Nothing to do for now */ + switch (cb) { + case MHI_CB_FATAL_ERROR: + case MHI_CB_SYS_ERROR: + dev_warn(&pdev->dev, "firmware crashed (%u)\n", cb); + pm_runtime_forbid(&pdev->dev); + break; + case MHI_CB_EE_MISSION_MODE: + pm_runtime_allow(&pdev->dev); + break; + default: + break; + } +} + +static void mhi_pci_wake_get_nop(struct mhi_controller *mhi_cntrl, bool force) +{ + /* no-op */ +} + +static void mhi_pci_wake_put_nop(struct mhi_controller *mhi_cntrl, bool override) +{ + /* no-op */ +} + +static void mhi_pci_wake_toggle_nop(struct mhi_controller *mhi_cntrl) +{ + /* no-op */ +} + +static bool mhi_pci_is_alive(struct mhi_controller *mhi_cntrl) +{ + struct pci_dev *pdev = to_pci_dev(mhi_cntrl->cntrl_dev); + u16 vendor = 0; + + if (pci_read_config_word(pdev, PCI_VENDOR_ID, &vendor)) + return false; + + if (vendor == (u16) ~0 || vendor == 0) + return false; + + return true; +} + +static int mhi_pci_claim(struct mhi_controller *mhi_cntrl, + unsigned int bar_num, u64 dma_mask) +{ + struct pci_dev *pdev = to_pci_dev(mhi_cntrl->cntrl_dev); + int err; + + err = pci_assign_resource(pdev, bar_num); + if (err) + return err; + + err = pcim_enable_device(pdev); + if (err) { + dev_err(&pdev->dev, "failed to enable pci device: %d\n", err); + return err; + } + + err = pcim_iomap_regions(pdev, 1 << bar_num, pci_name(pdev)); + if (err) { + dev_err(&pdev->dev, "failed to map pci region: %d\n", err); + return err; + } + mhi_cntrl->regs = pcim_iomap_table(pdev)[bar_num]; + mhi_cntrl->reg_len = pci_resource_len(pdev, bar_num); + + err = dma_set_mask_and_coherent(&pdev->dev, dma_mask); + if (err) { + dev_err(&pdev->dev, "Cannot set proper DMA mask\n"); + return err; + } + + pci_set_master(pdev); + + return 0; +} + +static int mhi_pci_get_irqs(struct mhi_controller *mhi_cntrl, + const struct mhi_controller_config *mhi_cntrl_config) +{ + struct pci_dev *pdev = to_pci_dev(mhi_cntrl->cntrl_dev); + int nr_vectors, i; + int *irq; + + /* + * Alloc one MSI vector for BHI + one vector per event ring, ideally... + * No explicit pci_free_irq_vectors required, done by pcim_release. + */ + mhi_cntrl->nr_irqs = 1 + mhi_cntrl_config->num_events; + + nr_vectors = pci_alloc_irq_vectors(pdev, 1, mhi_cntrl->nr_irqs, PCI_IRQ_MSI); + if (nr_vectors < 0) { + dev_err(&pdev->dev, "Error allocating MSI vectors %d\n", + nr_vectors); + return nr_vectors; + } + + if (nr_vectors < mhi_cntrl->nr_irqs) { + dev_warn(&pdev->dev, "using shared MSI\n"); + + /* Patch msi vectors, use only one (shared) */ + for (i = 0; i < mhi_cntrl_config->num_events; i++) + mhi_cntrl_config->event_cfg[i].irq = 0; + mhi_cntrl->nr_irqs = 1; + } + + irq = devm_kcalloc(&pdev->dev, mhi_cntrl->nr_irqs, sizeof(int), GFP_KERNEL); + if (!irq) + return -ENOMEM; + + for (i = 0; i < mhi_cntrl->nr_irqs; i++) { + int vector = i >= nr_vectors ? (nr_vectors - 1) : i; + + irq[i] = pci_irq_vector(pdev, vector); + } + + mhi_cntrl->irq = irq; + + return 0; +} + +static int mhi_pci_runtime_get(struct mhi_controller *mhi_cntrl) +{ + /* The runtime_get() MHI callback means: + * Do whatever is requested to leave M3. + */ + return pm_runtime_get(mhi_cntrl->cntrl_dev); +} + +static void mhi_pci_runtime_put(struct mhi_controller *mhi_cntrl) +{ + /* The runtime_put() MHI callback means: + * Device can be moved in M3 state. + */ + pm_runtime_mark_last_busy(mhi_cntrl->cntrl_dev); + pm_runtime_put(mhi_cntrl->cntrl_dev); +} + +static void mhi_pci_recovery_work(struct work_struct *work) +{ + struct mhi_pci_device *mhi_pdev = container_of(work, struct mhi_pci_device, + recovery_work); + struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl; + struct pci_dev *pdev = to_pci_dev(mhi_cntrl->cntrl_dev); + int err; + + dev_warn(&pdev->dev, "device recovery started\n"); + + del_timer(&mhi_pdev->health_check_timer); + pm_runtime_forbid(&pdev->dev); + + /* Clean up MHI state */ + if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) { + mhi_power_down(mhi_cntrl, false); + mhi_unprepare_after_power_down(mhi_cntrl); + } + + pci_set_power_state(pdev, PCI_D0); + pci_load_saved_state(pdev, mhi_pdev->pci_state); + pci_restore_state(pdev); + + if (!mhi_pci_is_alive(mhi_cntrl)) + goto err_try_reset; + + err = mhi_prepare_for_power_up(mhi_cntrl); + if (err) + goto err_try_reset; + + err = mhi_sync_power_up(mhi_cntrl); + if (err) + goto err_unprepare; + + dev_dbg(&pdev->dev, "Recovery completed\n"); + + set_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status); + mod_timer(&mhi_pdev->health_check_timer, jiffies + HEALTH_CHECK_PERIOD); + return; + +err_unprepare: + mhi_unprepare_after_power_down(mhi_cntrl); +err_try_reset: + if (pci_reset_function(pdev)) + dev_err(&pdev->dev, "Recovery failed\n"); +} + +static void health_check(struct timer_list *t) +{ + struct mhi_pci_device *mhi_pdev = from_timer(mhi_pdev, t, health_check_timer); + struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl; + + if (!test_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status) || + test_bit(MHI_PCI_DEV_SUSPENDED, &mhi_pdev->status)) + return; + + if (!mhi_pci_is_alive(mhi_cntrl)) { + dev_err(mhi_cntrl->cntrl_dev, "Device died\n"); + queue_work(system_long_wq, &mhi_pdev->recovery_work); + return; + } + + /* reschedule in two seconds */ + mod_timer(&mhi_pdev->health_check_timer, jiffies + HEALTH_CHECK_PERIOD); +} + +static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) +{ + const struct mhi_pci_dev_info *info = (struct mhi_pci_dev_info *) id->driver_data; + const struct mhi_controller_config *mhi_cntrl_config; + struct mhi_pci_device *mhi_pdev; + struct mhi_controller *mhi_cntrl; + int err; + + dev_info(&pdev->dev, "MHI PCI device found: %s\n", info->name); + + /* mhi_pdev.mhi_cntrl must be zero-initialized */ + mhi_pdev = devm_kzalloc(&pdev->dev, sizeof(*mhi_pdev), GFP_KERNEL); + if (!mhi_pdev) + return -ENOMEM; + + INIT_WORK(&mhi_pdev->recovery_work, mhi_pci_recovery_work); + timer_setup(&mhi_pdev->health_check_timer, health_check, 0); + + mhi_cntrl_config = info->config; + mhi_cntrl = &mhi_pdev->mhi_cntrl; + + mhi_cntrl->cntrl_dev = &pdev->dev; + mhi_cntrl->iova_start = 0; + mhi_cntrl->iova_stop = (dma_addr_t)DMA_BIT_MASK(info->dma_data_width); + mhi_cntrl->fw_image = info->fw; + mhi_cntrl->edl_image = info->edl; + + mhi_cntrl->read_reg = mhi_pci_read_reg; + mhi_cntrl->write_reg = mhi_pci_write_reg; + mhi_cntrl->status_cb = mhi_pci_status_cb; + mhi_cntrl->runtime_get = mhi_pci_runtime_get; + mhi_cntrl->runtime_put = mhi_pci_runtime_put; + mhi_cntrl->mru = info->mru_default; + + if (info->sideband_wake) { + mhi_cntrl->wake_get = mhi_pci_wake_get_nop; + mhi_cntrl->wake_put = mhi_pci_wake_put_nop; + mhi_cntrl->wake_toggle = mhi_pci_wake_toggle_nop; + } + + err = mhi_pci_claim(mhi_cntrl, info->bar_num, DMA_BIT_MASK(info->dma_data_width)); + if (err) + return err; + + err = mhi_pci_get_irqs(mhi_cntrl, mhi_cntrl_config); + if (err) + return err; + + pci_set_drvdata(pdev, mhi_pdev); + + /* Have stored pci confspace at hand for restore in sudden PCI error. + * cache the state locally and discard the PCI core one. + */ + pci_save_state(pdev); + mhi_pdev->pci_state = pci_store_saved_state(pdev); + pci_load_saved_state(pdev, NULL); + + pci_enable_pcie_error_reporting(pdev); + + err = mhi_register_controller(mhi_cntrl, mhi_cntrl_config); + if (err) + goto err_disable_reporting; + + /* MHI bus does not power up the controller by default */ + err = mhi_prepare_for_power_up(mhi_cntrl); + if (err) { + dev_err(&pdev->dev, "failed to prepare MHI controller\n"); + goto err_unregister; + } + + err = mhi_sync_power_up(mhi_cntrl); + if (err) { + dev_err(&pdev->dev, "failed to power up MHI controller\n"); + goto err_unprepare; + } + + set_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status); + + /* start health check */ + mod_timer(&mhi_pdev->health_check_timer, jiffies + HEALTH_CHECK_PERIOD); + + /* Only allow runtime-suspend if PME capable (for wakeup) */ + if (pci_pme_capable(pdev, PCI_D3hot)) { + pm_runtime_set_autosuspend_delay(&pdev->dev, 2000); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_mark_last_busy(&pdev->dev); + pm_runtime_put_noidle(&pdev->dev); + } + + return 0; + +err_unprepare: + mhi_unprepare_after_power_down(mhi_cntrl); +err_unregister: + mhi_unregister_controller(mhi_cntrl); +err_disable_reporting: + pci_disable_pcie_error_reporting(pdev); + + return err; +} + +static void mhi_pci_remove(struct pci_dev *pdev) +{ + struct mhi_pci_device *mhi_pdev = pci_get_drvdata(pdev); + struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl; + + del_timer_sync(&mhi_pdev->health_check_timer); + cancel_work_sync(&mhi_pdev->recovery_work); + + if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) { + mhi_power_down(mhi_cntrl, true); + mhi_unprepare_after_power_down(mhi_cntrl); + } + + /* balancing probe put_noidle */ + if (pci_pme_capable(pdev, PCI_D3hot)) + pm_runtime_get_noresume(&pdev->dev); + + mhi_unregister_controller(mhi_cntrl); + pci_disable_pcie_error_reporting(pdev); +} + +static void mhi_pci_shutdown(struct pci_dev *pdev) +{ + mhi_pci_remove(pdev); + pci_set_power_state(pdev, PCI_D3hot); +} + +static void mhi_pci_reset_prepare(struct pci_dev *pdev) +{ + struct mhi_pci_device *mhi_pdev = pci_get_drvdata(pdev); + struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl; + + dev_info(&pdev->dev, "reset\n"); + + del_timer(&mhi_pdev->health_check_timer); + + /* Clean up MHI state */ + if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) { + mhi_power_down(mhi_cntrl, false); + mhi_unprepare_after_power_down(mhi_cntrl); + } + + /* cause internal device reset */ + mhi_soc_reset(mhi_cntrl); + + /* Be sure device reset has been executed */ + msleep(MHI_POST_RESET_DELAY_MS); +} + +static void mhi_pci_reset_done(struct pci_dev *pdev) +{ + struct mhi_pci_device *mhi_pdev = pci_get_drvdata(pdev); + struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl; + int err; + + /* Restore initial known working PCI state */ + pci_load_saved_state(pdev, mhi_pdev->pci_state); + pci_restore_state(pdev); + + /* Is device status available ? */ + if (!mhi_pci_is_alive(mhi_cntrl)) { + dev_err(&pdev->dev, "reset failed\n"); + return; + } + + err = mhi_prepare_for_power_up(mhi_cntrl); + if (err) { + dev_err(&pdev->dev, "failed to prepare MHI controller\n"); + return; + } + + err = mhi_sync_power_up(mhi_cntrl); + if (err) { + dev_err(&pdev->dev, "failed to power up MHI controller\n"); + mhi_unprepare_after_power_down(mhi_cntrl); + return; + } + + set_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status); + mod_timer(&mhi_pdev->health_check_timer, jiffies + HEALTH_CHECK_PERIOD); +} + +static pci_ers_result_t mhi_pci_error_detected(struct pci_dev *pdev, + pci_channel_state_t state) +{ + struct mhi_pci_device *mhi_pdev = pci_get_drvdata(pdev); + struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl; + + dev_err(&pdev->dev, "PCI error detected, state = %u\n", state); + + if (state == pci_channel_io_perm_failure) + return PCI_ERS_RESULT_DISCONNECT; + + /* Clean up MHI state */ + if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) { + mhi_power_down(mhi_cntrl, false); + mhi_unprepare_after_power_down(mhi_cntrl); + } else { + /* Nothing to do */ + return PCI_ERS_RESULT_RECOVERED; + } + + pci_disable_device(pdev); + + return PCI_ERS_RESULT_NEED_RESET; +} + +static pci_ers_result_t mhi_pci_slot_reset(struct pci_dev *pdev) +{ + if (pci_enable_device(pdev)) { + dev_err(&pdev->dev, "Cannot re-enable PCI device after reset.\n"); + return PCI_ERS_RESULT_DISCONNECT; + } + + return PCI_ERS_RESULT_RECOVERED; +} + +static void mhi_pci_io_resume(struct pci_dev *pdev) +{ + struct mhi_pci_device *mhi_pdev = pci_get_drvdata(pdev); + + dev_err(&pdev->dev, "PCI slot reset done\n"); + + queue_work(system_long_wq, &mhi_pdev->recovery_work); +} + +static const struct pci_error_handlers mhi_pci_err_handler = { + .error_detected = mhi_pci_error_detected, + .slot_reset = mhi_pci_slot_reset, + .resume = mhi_pci_io_resume, + .reset_prepare = mhi_pci_reset_prepare, + .reset_done = mhi_pci_reset_done, +}; + +static int __maybe_unused mhi_pci_runtime_suspend(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct mhi_pci_device *mhi_pdev = dev_get_drvdata(dev); + struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl; + int err; + + if (test_and_set_bit(MHI_PCI_DEV_SUSPENDED, &mhi_pdev->status)) + return 0; + + del_timer(&mhi_pdev->health_check_timer); + cancel_work_sync(&mhi_pdev->recovery_work); + + if (!test_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status) || + mhi_cntrl->ee != MHI_EE_AMSS) + goto pci_suspend; /* Nothing to do at MHI level */ + + /* Transition to M3 state */ + err = mhi_pm_suspend(mhi_cntrl); + if (err) { + dev_err(&pdev->dev, "failed to suspend device: %d\n", err); + clear_bit(MHI_PCI_DEV_SUSPENDED, &mhi_pdev->status); + return -EBUSY; + } + +pci_suspend: + pci_disable_device(pdev); + pci_wake_from_d3(pdev, true); + + return 0; +} + +static int __maybe_unused mhi_pci_runtime_resume(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct mhi_pci_device *mhi_pdev = dev_get_drvdata(dev); + struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl; + int err; + + if (!test_and_clear_bit(MHI_PCI_DEV_SUSPENDED, &mhi_pdev->status)) + return 0; + + err = pci_enable_device(pdev); + if (err) + goto err_recovery; + + pci_set_master(pdev); + pci_wake_from_d3(pdev, false); + + if (!test_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status) || + mhi_cntrl->ee != MHI_EE_AMSS) + return 0; /* Nothing to do at MHI level */ + + /* Exit M3, transition to M0 state */ + err = mhi_pm_resume(mhi_cntrl); + if (err) { + dev_err(&pdev->dev, "failed to resume device: %d\n", err); + goto err_recovery; + } + + /* Resume health check */ + mod_timer(&mhi_pdev->health_check_timer, jiffies + HEALTH_CHECK_PERIOD); + + /* It can be a remote wakeup (no mhi runtime_get), update access time */ + pm_runtime_mark_last_busy(dev); + + return 0; + +err_recovery: + /* Do not fail to not mess up our PCI device state, the device likely + * lost power (d3cold) and we simply need to reset it from the recovery + * procedure, trigger the recovery asynchronously to prevent system + * suspend exit delaying. + */ + queue_work(system_long_wq, &mhi_pdev->recovery_work); + pm_runtime_mark_last_busy(dev); + + return 0; +} + +static int __maybe_unused mhi_pci_suspend(struct device *dev) +{ + pm_runtime_disable(dev); + return mhi_pci_runtime_suspend(dev); +} + +static int __maybe_unused mhi_pci_resume(struct device *dev) +{ + int ret; + + /* Depending the platform, device may have lost power (d3cold), we need + * to resume it now to check its state and recover when necessary. + */ + ret = mhi_pci_runtime_resume(dev); + pm_runtime_enable(dev); + + return ret; +} + +static int __maybe_unused mhi_pci_freeze(struct device *dev) +{ + struct mhi_pci_device *mhi_pdev = dev_get_drvdata(dev); + struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl; + + /* We want to stop all operations, hibernation does not guarantee that + * device will be in the same state as before freezing, especially if + * the intermediate restore kernel reinitializes MHI device with new + * context. + */ + flush_work(&mhi_pdev->recovery_work); + if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) { + mhi_power_down(mhi_cntrl, true); + mhi_unprepare_after_power_down(mhi_cntrl); + } + + return 0; +} + +static int __maybe_unused mhi_pci_restore(struct device *dev) +{ + struct mhi_pci_device *mhi_pdev = dev_get_drvdata(dev); + + /* Reinitialize the device */ + queue_work(system_long_wq, &mhi_pdev->recovery_work); + + return 0; +} + +static const struct dev_pm_ops mhi_pci_pm_ops = { + SET_RUNTIME_PM_OPS(mhi_pci_runtime_suspend, mhi_pci_runtime_resume, NULL) +#ifdef CONFIG_PM_SLEEP + .suspend = mhi_pci_suspend, + .resume = mhi_pci_resume, + .freeze = mhi_pci_freeze, + .thaw = mhi_pci_restore, + .poweroff = mhi_pci_freeze, + .restore = mhi_pci_restore, +#endif +}; + +static struct pci_driver mhi_pci_driver = { + .name = "mhi-pci-generic", + .id_table = mhi_pci_id_table, + .probe = mhi_pci_probe, + .remove = mhi_pci_remove, + .shutdown = mhi_pci_shutdown, + .err_handler = &mhi_pci_err_handler, + .driver.pm = &mhi_pci_pm_ops +}; +module_pci_driver(mhi_pci_driver); + +MODULE_AUTHOR("Loic Poulain <loic.poulain@linaro.org>"); +MODULE_DESCRIPTION("Modem Host Interface (MHI) PCI controller driver"); +MODULE_LICENSE("GPL"); |