| Message ID | 1603300699-24481-1-git-send-email-loic.poulain@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v5] bus: mhi: Add MHI PCI support for WWAN modems | expand |
On 10/21/20 10:18 AM, Loic Poulain wrote: > This is a generic MHI-over-PCI controller driver for MHI only devices > such as QCOM modems. For now it supports registering of Qualcomm SDX55 > based PCIe modules. The MHI channels have been extracted from mhi > downstream driver. > > This driver is for MHI-only devices which have all functionalities > exposed through MHI channels and accessed by the corresponding MHI > device drivers (no out-of-band communication). > > Signed-off-by: Loic Poulain <loic.poulain@linaro.org> > Reviewed-by: Bhaumik Bhatt <bbhatt@codeaurora.org> Reviewed-by: Hemant Kumar <hemantk@codeaurora.org>
On Wed, Oct 21, 2020 at 07:18:19PM +0200, Loic Poulain wrote: > This is a generic MHI-over-PCI controller driver for MHI only devices > such as QCOM modems. For now it supports registering of Qualcomm SDX55 > based PCIe modules. The MHI channels have been extracted from mhi > downstream driver. > > This driver is for MHI-only devices which have all functionalities > exposed through MHI channels and accessed by the corresponding MHI > device drivers (no out-of-band communication). > > Signed-off-by: Loic Poulain <loic.poulain@linaro.org> > Reviewed-by: Bhaumik Bhatt <bbhatt@codeaurora.org> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Thanks, Mani > > --- > v2: - remove useless delay.h include > - remove over-logging on error > - remove controller subdir > - rename to mhi_pci_modem.c > - Fix mhi_pci_probe exit path on error > - expand module description > - drop module version > v3: - Rename to mhi_pci_generic > - Add hardware accelerated IP channel (IPA) > - Added fw/edl names for sdx55m > v4: - Configurable dma width access > - Configurable PCI BAR number (default is 0) > v5: - use mhi_alloc_controller helper > - Various naming refactoring (macros, mhi_cntrl) > - Kconfig summary rework > - kdoc for structures > - rename driver file to pci_generic.c > - dev_info to dev_dbg > - warn message: shared irq > > drivers/bus/mhi/Kconfig | 9 ++ > drivers/bus/mhi/Makefile | 4 + > drivers/bus/mhi/pci_generic.c | 345 ++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 358 insertions(+) > create mode 100644 drivers/bus/mhi/pci_generic.c > > diff --git a/drivers/bus/mhi/Kconfig b/drivers/bus/mhi/Kconfig > index e841c10..da5cd0c 100644 > --- a/drivers/bus/mhi/Kconfig > +++ b/drivers/bus/mhi/Kconfig > @@ -20,3 +20,12 @@ config MHI_BUS_DEBUG > Enable debugfs support for use with the MHI transport. Allows > reading and/or modifying some values within the MHI controller > for debug and test purposes. > + > +config MHI_BUS_PCI_GENERIC > + tristate "MHI PCI controller driver" > + depends on MHI_BUS > + depends on PCI > + help > + This driver provides MHI PCI controller driver for devices such as > + Qualcomm SDX55 based PCIe modems. > + > diff --git a/drivers/bus/mhi/Makefile b/drivers/bus/mhi/Makefile > index 19e6443..059495f 100644 > --- a/drivers/bus/mhi/Makefile > +++ b/drivers/bus/mhi/Makefile > @@ -1,2 +1,6 @@ > # core layer > obj-y += core/ > + > +obj-$(CONFIG_MHI_BUS_PCI_GENERIC) := mhi_pci_generic.o > +mhi_pci_generic-y := pci_generic.o > + > diff --git a/drivers/bus/mhi/pci_generic.c b/drivers/bus/mhi/pci_generic.c > new file mode 100644 > index 0000000..e3df838 > --- /dev/null > +++ b/drivers/bus/mhi/pci_generic.c > @@ -0,0 +1,345 @@ > +// 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/device.h> > +#include <linux/mhi.h> > +#include <linux/module.h> > +#include <linux/pci.h> > + > +#define MHI_PCI_DEFAULT_BAR_NUM 0 > + > +/** > + * 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) > + */ > +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; > +}; > + > +#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_EVENT_CONFIG_CTRL(ev_ring) \ > + { \ > + .num_elements = 64, \ > + .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_EVENT_CONFIG_DATA(ev_ring) \ > + { \ > + .num_elements = 128, \ > + .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, ch_num) \ > + { \ > + .num_elements = 128, \ > + .irq_moderation_ms = 5, \ > + .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(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(21, "IPCR", 8, 0), > + MHI_CHANNEL_CONFIG_UL(100, "IP_HW0", 128, 1), > + MHI_CHANNEL_CONFIG_DL(101, "IP_HW0", 128, 2), > +}; > + > +static const struct mhi_event_config modem_qcom_v1_mhi_events[] = { > + /* first ring is control+data ring */ > + MHI_EVENT_CONFIG_CTRL(0), > + /* Hardware channels request dedicated hardware event rings */ > + MHI_EVENT_CONFIG_HW_DATA(1, 100), > + MHI_EVENT_CONFIG_HW_DATA(2, 101) > +}; > + > +static const struct mhi_controller_config modem_qcom_v1_mhiv_config = { > + .max_channels = 128, > + .timeout_ms = 5000, > + .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_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 > +}; > + > +static const struct pci_device_id mhi_pci_id_table[] = { > + { PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x0306), > + .driver_data = (kernel_ulong_t) &mhi_qcom_sdx55_info }, > + { } > +}; > +MODULE_DEVICE_TABLE(pci, mhi_pci_id_table); > + > +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) > +{ > + /* Nothing to do for now */ > +} > + > +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]; > + > + err = pci_set_dma_mask(pdev, dma_mask); > + if (err) { > + dev_err(&pdev->dev, "Cannot set proper DMA mask\n"); > + return err; > + } > + > + err = pci_set_consistent_dma_mask(pdev, dma_mask); > + if (err) { > + dev_err(&pdev->dev, "set consistent dma mask failed\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, "Not enough MSI vectors (%d/%d), use shared MSI\n", > + nr_vectors, mhi_cntrl_config->num_events); > + } > + > + 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) > +{ > + /* no PM for now */ > + return 0; > +} > + > +static void mhi_pci_runtime_put(struct mhi_controller *mhi_cntrl) > +{ > + /* no PM for now */ > +} > + > +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_controller *mhi_cntrl; > + int err; > + > + dev_dbg(&pdev->dev, "MHI PCI device found: %s\n", info->name); > + > + mhi_cntrl = mhi_alloc_controller(); > + if (!mhi_cntrl) > + return -ENOMEM; > + > + mhi_cntrl_config = info->config; > + mhi_cntrl->cntrl_dev = &pdev->dev; > + mhi_cntrl->iova_start = 0; > + mhi_cntrl->iova_stop = 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; > + > + err = mhi_pci_claim(mhi_cntrl, info->bar_num, DMA_BIT_MASK(info->dma_data_width)); > + if (err) > + goto err_release; > + > + err = mhi_pci_get_irqs(mhi_cntrl, mhi_cntrl_config); > + if (err) > + goto err_release; > + > + pci_set_drvdata(pdev, mhi_cntrl); > + > + err = mhi_register_controller(mhi_cntrl, mhi_cntrl_config); > + if (err) > + goto err_release; > + > + /* 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; > + } > + > + return 0; > + > +err_unprepare: > + mhi_unprepare_after_power_down(mhi_cntrl); > +err_unregister: > + mhi_unregister_controller(mhi_cntrl); > +err_release: > + mhi_free_controller(mhi_cntrl); > + > + return err; > +} > + > +static void mhi_pci_remove(struct pci_dev *pdev) > +{ > + struct mhi_controller *mhi_cntrl = pci_get_drvdata(pdev); > + > + mhi_power_down(mhi_cntrl, true); > + mhi_unprepare_after_power_down(mhi_cntrl); > + mhi_unregister_controller(mhi_cntrl); > + mhi_free_controller(mhi_cntrl); > +} > + > +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 > +}; > +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"); > -- > 2.7.4 >
On Wed, Oct 21, 2020 at 07:18:19PM +0200, Loic Poulain wrote: > This is a generic MHI-over-PCI controller driver for MHI only devices > such as QCOM modems. For now it supports registering of Qualcomm SDX55 > based PCIe modules. The MHI channels have been extracted from mhi > downstream driver. > > This driver is for MHI-only devices which have all functionalities > exposed through MHI channels and accessed by the corresponding MHI > device drivers (no out-of-band communication). > > Signed-off-by: Loic Poulain <loic.poulain@linaro.org> > Reviewed-by: Bhaumik Bhatt <bbhatt@codeaurora.org> Applied to mhi-next after fixing up the Makefile rule! Thanks, Mani > > --- > v2: - remove useless delay.h include > - remove over-logging on error > - remove controller subdir > - rename to mhi_pci_modem.c > - Fix mhi_pci_probe exit path on error > - expand module description > - drop module version > v3: - Rename to mhi_pci_generic > - Add hardware accelerated IP channel (IPA) > - Added fw/edl names for sdx55m > v4: - Configurable dma width access > - Configurable PCI BAR number (default is 0) > v5: - use mhi_alloc_controller helper > - Various naming refactoring (macros, mhi_cntrl) > - Kconfig summary rework > - kdoc for structures > - rename driver file to pci_generic.c > - dev_info to dev_dbg > - warn message: shared irq > > drivers/bus/mhi/Kconfig | 9 ++ > drivers/bus/mhi/Makefile | 4 + > drivers/bus/mhi/pci_generic.c | 345 ++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 358 insertions(+) > create mode 100644 drivers/bus/mhi/pci_generic.c > > diff --git a/drivers/bus/mhi/Kconfig b/drivers/bus/mhi/Kconfig > index e841c10..da5cd0c 100644 > --- a/drivers/bus/mhi/Kconfig > +++ b/drivers/bus/mhi/Kconfig > @@ -20,3 +20,12 @@ config MHI_BUS_DEBUG > Enable debugfs support for use with the MHI transport. Allows > reading and/or modifying some values within the MHI controller > for debug and test purposes. > + > +config MHI_BUS_PCI_GENERIC > + tristate "MHI PCI controller driver" > + depends on MHI_BUS > + depends on PCI > + help > + This driver provides MHI PCI controller driver for devices such as > + Qualcomm SDX55 based PCIe modems. > + > diff --git a/drivers/bus/mhi/Makefile b/drivers/bus/mhi/Makefile > index 19e6443..059495f 100644 > --- a/drivers/bus/mhi/Makefile > +++ b/drivers/bus/mhi/Makefile > @@ -1,2 +1,6 @@ > # core layer > obj-y += core/ > + > +obj-$(CONFIG_MHI_BUS_PCI_GENERIC) := mhi_pci_generic.o > +mhi_pci_generic-y := pci_generic.o > + > diff --git a/drivers/bus/mhi/pci_generic.c b/drivers/bus/mhi/pci_generic.c > new file mode 100644 > index 0000000..e3df838 > --- /dev/null > +++ b/drivers/bus/mhi/pci_generic.c > @@ -0,0 +1,345 @@ > +// 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/device.h> > +#include <linux/mhi.h> > +#include <linux/module.h> > +#include <linux/pci.h> > + > +#define MHI_PCI_DEFAULT_BAR_NUM 0 > + > +/** > + * 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) > + */ > +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; > +}; > + > +#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_EVENT_CONFIG_CTRL(ev_ring) \ > + { \ > + .num_elements = 64, \ > + .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_EVENT_CONFIG_DATA(ev_ring) \ > + { \ > + .num_elements = 128, \ > + .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, ch_num) \ > + { \ > + .num_elements = 128, \ > + .irq_moderation_ms = 5, \ > + .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(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(21, "IPCR", 8, 0), > + MHI_CHANNEL_CONFIG_UL(100, "IP_HW0", 128, 1), > + MHI_CHANNEL_CONFIG_DL(101, "IP_HW0", 128, 2), > +}; > + > +static const struct mhi_event_config modem_qcom_v1_mhi_events[] = { > + /* first ring is control+data ring */ > + MHI_EVENT_CONFIG_CTRL(0), > + /* Hardware channels request dedicated hardware event rings */ > + MHI_EVENT_CONFIG_HW_DATA(1, 100), > + MHI_EVENT_CONFIG_HW_DATA(2, 101) > +}; > + > +static const struct mhi_controller_config modem_qcom_v1_mhiv_config = { > + .max_channels = 128, > + .timeout_ms = 5000, > + .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_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 > +}; > + > +static const struct pci_device_id mhi_pci_id_table[] = { > + { PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x0306), > + .driver_data = (kernel_ulong_t) &mhi_qcom_sdx55_info }, > + { } > +}; > +MODULE_DEVICE_TABLE(pci, mhi_pci_id_table); > + > +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) > +{ > + /* Nothing to do for now */ > +} > + > +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]; > + > + err = pci_set_dma_mask(pdev, dma_mask); > + if (err) { > + dev_err(&pdev->dev, "Cannot set proper DMA mask\n"); > + return err; > + } > + > + err = pci_set_consistent_dma_mask(pdev, dma_mask); > + if (err) { > + dev_err(&pdev->dev, "set consistent dma mask failed\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, "Not enough MSI vectors (%d/%d), use shared MSI\n", > + nr_vectors, mhi_cntrl_config->num_events); > + } > + > + 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) > +{ > + /* no PM for now */ > + return 0; > +} > + > +static void mhi_pci_runtime_put(struct mhi_controller *mhi_cntrl) > +{ > + /* no PM for now */ > +} > + > +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_controller *mhi_cntrl; > + int err; > + > + dev_dbg(&pdev->dev, "MHI PCI device found: %s\n", info->name); > + > + mhi_cntrl = mhi_alloc_controller(); > + if (!mhi_cntrl) > + return -ENOMEM; > + > + mhi_cntrl_config = info->config; > + mhi_cntrl->cntrl_dev = &pdev->dev; > + mhi_cntrl->iova_start = 0; > + mhi_cntrl->iova_stop = 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; > + > + err = mhi_pci_claim(mhi_cntrl, info->bar_num, DMA_BIT_MASK(info->dma_data_width)); > + if (err) > + goto err_release; > + > + err = mhi_pci_get_irqs(mhi_cntrl, mhi_cntrl_config); > + if (err) > + goto err_release; > + > + pci_set_drvdata(pdev, mhi_cntrl); > + > + err = mhi_register_controller(mhi_cntrl, mhi_cntrl_config); > + if (err) > + goto err_release; > + > + /* 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; > + } > + > + return 0; > + > +err_unprepare: > + mhi_unprepare_after_power_down(mhi_cntrl); > +err_unregister: > + mhi_unregister_controller(mhi_cntrl); > +err_release: > + mhi_free_controller(mhi_cntrl); > + > + return err; > +} > + > +static void mhi_pci_remove(struct pci_dev *pdev) > +{ > + struct mhi_controller *mhi_cntrl = pci_get_drvdata(pdev); > + > + mhi_power_down(mhi_cntrl, true); > + mhi_unprepare_after_power_down(mhi_cntrl); > + mhi_unregister_controller(mhi_cntrl); > + mhi_free_controller(mhi_cntrl); > +} > + > +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 > +}; > +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"); > -- > 2.7.4 >
On Wed, Oct 21, 2020 at 07:18:19PM +0200, Loic Poulain wrote: > This is a generic MHI-over-PCI controller driver for MHI only devices > such as QCOM modems. For now it supports registering of Qualcomm SDX55 > based PCIe modules. The MHI channels have been extracted from mhi > downstream driver. > > This driver is for MHI-only devices which have all functionalities > exposed through MHI channels and accessed by the corresponding MHI > device drivers (no out-of-band communication). > > Signed-off-by: Loic Poulain <loic.poulain@linaro.org> > Reviewed-by: Bhaumik Bhatt <bbhatt@codeaurora.org> I see the following warning on 32-bit ARM with clang after this patch appeared in -next: drivers/bus/mhi/pci_generic.c:276:25: warning: implicit conversion from 'unsigned long long' to 'dma_addr_t' (aka 'unsigned int') changes value from 18446744073709551615 to 4294967295 [-Wconstant-conversion] mhi_cntrl->iova_stop = DMA_BIT_MASK(info->dma_data_width); ~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ./include/linux/dma-mapping.h:76:40: note: expanded from macro 'DMA_BIT_MASK' #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) ^~~~~ 1 warning generated. An explicit cast to dma_addr_t would solve it but I am not sure if that is proper or not. Cheers, Nathan
diff --git a/drivers/bus/mhi/Kconfig b/drivers/bus/mhi/Kconfig index e841c10..da5cd0c 100644 --- a/drivers/bus/mhi/Kconfig +++ b/drivers/bus/mhi/Kconfig @@ -20,3 +20,12 @@ config MHI_BUS_DEBUG Enable debugfs support for use with the MHI transport. Allows reading and/or modifying some values within the MHI controller for debug and test purposes. + +config MHI_BUS_PCI_GENERIC + tristate "MHI PCI controller driver" + depends on MHI_BUS + depends on PCI + help + This driver provides MHI PCI controller driver for devices such as + Qualcomm SDX55 based PCIe modems. + diff --git a/drivers/bus/mhi/Makefile b/drivers/bus/mhi/Makefile index 19e6443..059495f 100644 --- a/drivers/bus/mhi/Makefile +++ b/drivers/bus/mhi/Makefile @@ -1,2 +1,6 @@ # core layer obj-y += core/ + +obj-$(CONFIG_MHI_BUS_PCI_GENERIC) := mhi_pci_generic.o +mhi_pci_generic-y := pci_generic.o + diff --git a/drivers/bus/mhi/pci_generic.c b/drivers/bus/mhi/pci_generic.c new file mode 100644 index 0000000..e3df838 --- /dev/null +++ b/drivers/bus/mhi/pci_generic.c @@ -0,0 +1,345 @@ +// 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/device.h> +#include <linux/mhi.h> +#include <linux/module.h> +#include <linux/pci.h> + +#define MHI_PCI_DEFAULT_BAR_NUM 0 + +/** + * 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) + */ +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; +}; + +#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_EVENT_CONFIG_CTRL(ev_ring) \ + { \ + .num_elements = 64, \ + .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_EVENT_CONFIG_DATA(ev_ring) \ + { \ + .num_elements = 128, \ + .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, ch_num) \ + { \ + .num_elements = 128, \ + .irq_moderation_ms = 5, \ + .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(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(21, "IPCR", 8, 0), + MHI_CHANNEL_CONFIG_UL(100, "IP_HW0", 128, 1), + MHI_CHANNEL_CONFIG_DL(101, "IP_HW0", 128, 2), +}; + +static const struct mhi_event_config modem_qcom_v1_mhi_events[] = { + /* first ring is control+data ring */ + MHI_EVENT_CONFIG_CTRL(0), + /* Hardware channels request dedicated hardware event rings */ + MHI_EVENT_CONFIG_HW_DATA(1, 100), + MHI_EVENT_CONFIG_HW_DATA(2, 101) +}; + +static const struct mhi_controller_config modem_qcom_v1_mhiv_config = { + .max_channels = 128, + .timeout_ms = 5000, + .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_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 +}; + +static const struct pci_device_id mhi_pci_id_table[] = { + { PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x0306), + .driver_data = (kernel_ulong_t) &mhi_qcom_sdx55_info }, + { } +}; +MODULE_DEVICE_TABLE(pci, mhi_pci_id_table); + +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) +{ + /* Nothing to do for now */ +} + +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]; + + err = pci_set_dma_mask(pdev, dma_mask); + if (err) { + dev_err(&pdev->dev, "Cannot set proper DMA mask\n"); + return err; + } + + err = pci_set_consistent_dma_mask(pdev, dma_mask); + if (err) { + dev_err(&pdev->dev, "set consistent dma mask failed\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, "Not enough MSI vectors (%d/%d), use shared MSI\n", + nr_vectors, mhi_cntrl_config->num_events); + } + + 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) +{ + /* no PM for now */ + return 0; +} + +static void mhi_pci_runtime_put(struct mhi_controller *mhi_cntrl) +{ + /* no PM for now */ +} + +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_controller *mhi_cntrl; + int err; + + dev_dbg(&pdev->dev, "MHI PCI device found: %s\n", info->name); + + mhi_cntrl = mhi_alloc_controller(); + if (!mhi_cntrl) + return -ENOMEM; + + mhi_cntrl_config = info->config; + mhi_cntrl->cntrl_dev = &pdev->dev; + mhi_cntrl->iova_start = 0; + mhi_cntrl->iova_stop = 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; + + err = mhi_pci_claim(mhi_cntrl, info->bar_num, DMA_BIT_MASK(info->dma_data_width)); + if (err) + goto err_release; + + err = mhi_pci_get_irqs(mhi_cntrl, mhi_cntrl_config); + if (err) + goto err_release; + + pci_set_drvdata(pdev, mhi_cntrl); + + err = mhi_register_controller(mhi_cntrl, mhi_cntrl_config); + if (err) + goto err_release; + + /* 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; + } + + return 0; + +err_unprepare: + mhi_unprepare_after_power_down(mhi_cntrl); +err_unregister: + mhi_unregister_controller(mhi_cntrl); +err_release: + mhi_free_controller(mhi_cntrl); + + return err; +} + +static void mhi_pci_remove(struct pci_dev *pdev) +{ + struct mhi_controller *mhi_cntrl = pci_get_drvdata(pdev); + + mhi_power_down(mhi_cntrl, true); + mhi_unprepare_after_power_down(mhi_cntrl); + mhi_unregister_controller(mhi_cntrl); + mhi_free_controller(mhi_cntrl); +} + +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 +}; +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");