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Diffstat (limited to 'drivers/hid/intel-ish-hid/ipc/pci-ish.c')
-rw-r--r--drivers/hid/intel-ish-hid/ipc/pci-ish.c414
1 files changed, 414 insertions, 0 deletions
diff --git a/drivers/hid/intel-ish-hid/ipc/pci-ish.c b/drivers/hid/intel-ish-hid/ipc/pci-ish.c
new file mode 100644
index 000000000..710fda5f1
--- /dev/null
+++ b/drivers/hid/intel-ish-hid/ipc/pci-ish.c
@@ -0,0 +1,414 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PCI glue for ISHTP provider device (ISH) driver
+ *
+ * Copyright (c) 2014-2016, Intel Corporation.
+ */
+
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/sched.h>
+#include <linux/suspend.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/intel_ish.h>
+#include "ishtp-dev.h"
+#include "hw-ish.h"
+
+static const struct pci_device_id ish_pci_tbl[] = {
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, CHV_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, BXT_Ax_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, BXT_Bx_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, APL_Ax_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, SPT_Ax_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, CNL_Ax_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, GLK_Ax_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, CNL_H_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, ICL_MOBILE_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, SPT_H_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, CML_LP_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, CMP_H_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, EHL_Ax_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, TGL_LP_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, TGL_H_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, ADL_S_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, ADL_P_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, ADL_N_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, RPL_S_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MTL_P_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, ARL_H_DEVICE_ID)},
+ {0, }
+};
+MODULE_DEVICE_TABLE(pci, ish_pci_tbl);
+
+/**
+ * ish_event_tracer() - Callback function to dump trace messages
+ * @dev: ishtp device
+ * @format: printf style format
+ *
+ * Callback to direct log messages to Linux trace buffers
+ */
+static __printf(2, 3)
+void ish_event_tracer(struct ishtp_device *dev, const char *format, ...)
+{
+ if (trace_ishtp_dump_enabled()) {
+ va_list args;
+ char tmp_buf[100];
+
+ va_start(args, format);
+ vsnprintf(tmp_buf, sizeof(tmp_buf), format, args);
+ va_end(args);
+
+ trace_ishtp_dump(tmp_buf);
+ }
+}
+
+/**
+ * ish_init() - Init function
+ * @dev: ishtp device
+ *
+ * This function initialize wait queues for suspend/resume and call
+ * calls hadware initialization function. This will initiate
+ * startup sequence
+ *
+ * Return: 0 for success or error code for failure
+ */
+static int ish_init(struct ishtp_device *dev)
+{
+ int ret;
+
+ /* Set the state of ISH HW to start */
+ ret = ish_hw_start(dev);
+ if (ret) {
+ dev_err(dev->devc, "ISH: hw start failed.\n");
+ return ret;
+ }
+
+ /* Start the inter process communication to ISH processor */
+ ret = ishtp_start(dev);
+ if (ret) {
+ dev_err(dev->devc, "ISHTP: Protocol init failed.\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct pci_device_id ish_invalid_pci_ids[] = {
+ /* Mehlow platform special pci ids */
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0xA309)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0xA30A)},
+ {}
+};
+
+static inline bool ish_should_enter_d0i3(struct pci_dev *pdev)
+{
+ return !pm_suspend_via_firmware() || pdev->device == CHV_DEVICE_ID;
+}
+
+static inline bool ish_should_leave_d0i3(struct pci_dev *pdev)
+{
+ return !pm_resume_via_firmware() || pdev->device == CHV_DEVICE_ID;
+}
+
+static int enable_gpe(struct device *dev)
+{
+#ifdef CONFIG_ACPI
+ acpi_status acpi_sts;
+ struct acpi_device *adev;
+ struct acpi_device_wakeup *wakeup;
+
+ adev = ACPI_COMPANION(dev);
+ if (!adev) {
+ dev_err(dev, "get acpi handle failed\n");
+ return -ENODEV;
+ }
+ wakeup = &adev->wakeup;
+
+ /*
+ * Call acpi_disable_gpe(), so that reference count
+ * gpe_event_info->runtime_count doesn't overflow.
+ * When gpe_event_info->runtime_count = 0, the call
+ * to acpi_disable_gpe() simply return.
+ */
+ acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
+
+ acpi_sts = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number);
+ if (ACPI_FAILURE(acpi_sts)) {
+ dev_err(dev, "enable ose_gpe failed\n");
+ return -EIO;
+ }
+
+ return 0;
+#else
+ return -ENODEV;
+#endif
+}
+
+static void enable_pme_wake(struct pci_dev *pdev)
+{
+ if ((pci_pme_capable(pdev, PCI_D0) ||
+ pci_pme_capable(pdev, PCI_D3hot) ||
+ pci_pme_capable(pdev, PCI_D3cold)) && !enable_gpe(&pdev->dev)) {
+ pci_pme_active(pdev, true);
+ dev_dbg(&pdev->dev, "ish ipc driver pme wake enabled\n");
+ }
+}
+
+/**
+ * ish_probe() - PCI driver probe callback
+ * @pdev: pci device
+ * @ent: pci device id
+ *
+ * Initialize PCI function, setup interrupt and call for ISH initialization
+ *
+ * Return: 0 for success or error code for failure
+ */
+static int ish_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+ int ret;
+ struct ish_hw *hw;
+ unsigned long irq_flag = 0;
+ struct ishtp_device *ishtp;
+ struct device *dev = &pdev->dev;
+
+ /* Check for invalid platforms for ISH support */
+ if (pci_dev_present(ish_invalid_pci_ids))
+ return -ENODEV;
+
+ /* enable pci dev */
+ ret = pcim_enable_device(pdev);
+ if (ret) {
+ dev_err(dev, "ISH: Failed to enable PCI device\n");
+ return ret;
+ }
+
+ /* set PCI host mastering */
+ pci_set_master(pdev);
+
+ /* pci request regions for ISH driver */
+ ret = pcim_iomap_regions(pdev, 1 << 0, KBUILD_MODNAME);
+ if (ret) {
+ dev_err(dev, "ISH: Failed to get PCI regions\n");
+ return ret;
+ }
+
+ /* allocates and initializes the ISH dev structure */
+ ishtp = ish_dev_init(pdev);
+ if (!ishtp) {
+ ret = -ENOMEM;
+ return ret;
+ }
+ hw = to_ish_hw(ishtp);
+ ishtp->print_log = ish_event_tracer;
+
+ /* mapping IO device memory */
+ hw->mem_addr = pcim_iomap_table(pdev)[0];
+ ishtp->pdev = pdev;
+
+ /* request and enable interrupt */
+ ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
+ if (!pdev->msi_enabled && !pdev->msix_enabled)
+ irq_flag = IRQF_SHARED;
+
+ ret = devm_request_irq(dev, pdev->irq, ish_irq_handler,
+ irq_flag, KBUILD_MODNAME, ishtp);
+ if (ret) {
+ dev_err(dev, "ISH: request IRQ %d failed\n", pdev->irq);
+ return ret;
+ }
+
+ dev_set_drvdata(ishtp->devc, ishtp);
+
+ init_waitqueue_head(&ishtp->suspend_wait);
+ init_waitqueue_head(&ishtp->resume_wait);
+
+ /* Enable PME for EHL */
+ if (pdev->device == EHL_Ax_DEVICE_ID)
+ enable_pme_wake(pdev);
+
+ ret = ish_init(ishtp);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+/**
+ * ish_remove() - PCI driver remove callback
+ * @pdev: pci device
+ *
+ * This function does cleanup of ISH on pci remove callback
+ */
+static void ish_remove(struct pci_dev *pdev)
+{
+ struct ishtp_device *ishtp_dev = pci_get_drvdata(pdev);
+
+ ishtp_bus_remove_all_clients(ishtp_dev, false);
+ ish_device_disable(ishtp_dev);
+}
+
+static struct device __maybe_unused *ish_resume_device;
+
+/* 50ms to get resume response */
+#define WAIT_FOR_RESUME_ACK_MS 50
+
+/**
+ * ish_resume_handler() - Work function to complete resume
+ * @work: work struct
+ *
+ * The resume work function to complete resume function asynchronously.
+ * There are two resume paths, one where ISH is not powered off,
+ * in that case a simple resume message is enough, others we need
+ * a reset sequence.
+ */
+static void __maybe_unused ish_resume_handler(struct work_struct *work)
+{
+ struct pci_dev *pdev = to_pci_dev(ish_resume_device);
+ struct ishtp_device *dev = pci_get_drvdata(pdev);
+ uint32_t fwsts = dev->ops->get_fw_status(dev);
+
+ if (ish_should_leave_d0i3(pdev) && !dev->suspend_flag
+ && IPC_IS_ISH_ILUP(fwsts)) {
+ if (device_may_wakeup(&pdev->dev))
+ disable_irq_wake(pdev->irq);
+
+ ish_set_host_ready(dev);
+
+ ishtp_send_resume(dev);
+
+ /* Waiting to get resume response */
+ if (dev->resume_flag)
+ wait_event_interruptible_timeout(dev->resume_wait,
+ !dev->resume_flag,
+ msecs_to_jiffies(WAIT_FOR_RESUME_ACK_MS));
+
+ /*
+ * If the flag is not cleared, something is wrong with ISH FW.
+ * So on resume, need to go through init sequence again.
+ */
+ if (dev->resume_flag)
+ ish_init(dev);
+ } else {
+ /*
+ * Resume from the D3, full reboot of ISH processor will happen,
+ * so need to go through init sequence again.
+ */
+ ish_init(dev);
+ }
+}
+
+/**
+ * ish_suspend() - ISH suspend callback
+ * @device: device pointer
+ *
+ * ISH suspend callback
+ *
+ * Return: 0 to the pm core
+ */
+static int __maybe_unused ish_suspend(struct device *device)
+{
+ struct pci_dev *pdev = to_pci_dev(device);
+ struct ishtp_device *dev = pci_get_drvdata(pdev);
+
+ if (ish_should_enter_d0i3(pdev)) {
+ /*
+ * If previous suspend hasn't been asnwered then ISH is likely
+ * dead, don't attempt nested notification
+ */
+ if (dev->suspend_flag)
+ return 0;
+
+ dev->resume_flag = 0;
+ dev->suspend_flag = 1;
+ ishtp_send_suspend(dev);
+
+ /* 25 ms should be enough for live ISH to flush all IPC buf */
+ if (dev->suspend_flag)
+ wait_event_interruptible_timeout(dev->suspend_wait,
+ !dev->suspend_flag,
+ msecs_to_jiffies(25));
+
+ if (dev->suspend_flag) {
+ /*
+ * It looks like FW halt, clear the DMA bit, and put
+ * ISH into D3, and FW would reset on resume.
+ */
+ ish_disable_dma(dev);
+ } else {
+ /*
+ * Save state so PCI core will keep the device at D0,
+ * the ISH would enter D0i3
+ */
+ pci_save_state(pdev);
+
+ if (device_may_wakeup(&pdev->dev))
+ enable_irq_wake(pdev->irq);
+ }
+ } else {
+ /*
+ * Clear the DMA bit before putting ISH into D3,
+ * or ISH FW would reset automatically.
+ */
+ ish_disable_dma(dev);
+ }
+
+ return 0;
+}
+
+static __maybe_unused DECLARE_WORK(resume_work, ish_resume_handler);
+/**
+ * ish_resume() - ISH resume callback
+ * @device: device pointer
+ *
+ * ISH resume callback
+ *
+ * Return: 0 to the pm core
+ */
+static int __maybe_unused ish_resume(struct device *device)
+{
+ struct pci_dev *pdev = to_pci_dev(device);
+ struct ishtp_device *dev = pci_get_drvdata(pdev);
+
+ /* add this to finish power flow for EHL */
+ if (dev->pdev->device == EHL_Ax_DEVICE_ID) {
+ pci_set_power_state(pdev, PCI_D0);
+ enable_pme_wake(pdev);
+ dev_dbg(dev->devc, "set power state to D0 for ehl\n");
+ }
+
+ ish_resume_device = device;
+ dev->resume_flag = 1;
+
+ schedule_work(&resume_work);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(ish_pm_ops, ish_suspend, ish_resume);
+
+static struct pci_driver ish_driver = {
+ .name = KBUILD_MODNAME,
+ .id_table = ish_pci_tbl,
+ .probe = ish_probe,
+ .remove = ish_remove,
+ .driver.pm = &ish_pm_ops,
+};
+
+module_pci_driver(ish_driver);
+
+/* Original author */
+MODULE_AUTHOR("Daniel Drubin <daniel.drubin@intel.com>");
+/* Adoption to upstream Linux kernel */
+MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
+
+MODULE_DESCRIPTION("Intel(R) Integrated Sensor Hub PCI Device Driver");
+MODULE_LICENSE("GPL");