316 lines
6.9 KiB
C
316 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright(c) 2019-2022, Intel Corporation. All rights reserved.
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*
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* Intel Management Engine Interface (Intel MEI) Linux driver
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*/
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#include <linux/module.h>
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#include <linux/mei_aux.h>
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#include <linux/device.h>
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#include <linux/irqreturn.h>
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#include <linux/jiffies.h>
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#include <linux/ktime.h>
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#include <linux/delay.h>
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#include <linux/pm_runtime.h>
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#include <linux/kthread.h>
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#include "mei_dev.h"
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#include "hw-me.h"
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#include "hw-me-regs.h"
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#include "mei-trace.h"
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#define MEI_GSC_RPM_TIMEOUT 500
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static int mei_gsc_read_hfs(const struct mei_device *dev, int where, u32 *val)
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{
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struct mei_me_hw *hw = to_me_hw(dev);
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*val = ioread32(hw->mem_addr + where + 0xC00);
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return 0;
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}
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static void mei_gsc_set_ext_op_mem(const struct mei_me_hw *hw, struct resource *mem)
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{
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u32 low = lower_32_bits(mem->start);
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u32 hi = upper_32_bits(mem->start);
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u32 limit = (resource_size(mem) / SZ_4K) | GSC_EXT_OP_MEM_VALID;
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iowrite32(low, hw->mem_addr + H_GSC_EXT_OP_MEM_BASE_ADDR_LO_REG);
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iowrite32(hi, hw->mem_addr + H_GSC_EXT_OP_MEM_BASE_ADDR_HI_REG);
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iowrite32(limit, hw->mem_addr + H_GSC_EXT_OP_MEM_LIMIT_REG);
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}
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static int mei_gsc_probe(struct auxiliary_device *aux_dev,
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const struct auxiliary_device_id *aux_dev_id)
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{
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struct mei_aux_device *adev = auxiliary_dev_to_mei_aux_dev(aux_dev);
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struct mei_device *dev;
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struct mei_me_hw *hw;
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struct device *device;
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const struct mei_cfg *cfg;
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int ret;
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cfg = mei_me_get_cfg(aux_dev_id->driver_data);
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if (!cfg)
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return -ENODEV;
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device = &aux_dev->dev;
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dev = mei_me_dev_init(device, cfg, adev->slow_firmware);
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if (!dev) {
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ret = -ENOMEM;
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goto err;
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}
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hw = to_me_hw(dev);
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hw->mem_addr = devm_ioremap_resource(device, &adev->bar);
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if (IS_ERR(hw->mem_addr)) {
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ret = PTR_ERR(hw->mem_addr);
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goto err;
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}
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hw->irq = adev->irq;
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hw->read_fws = mei_gsc_read_hfs;
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dev_set_drvdata(device, dev);
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if (adev->ext_op_mem.start) {
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mei_gsc_set_ext_op_mem(hw, &adev->ext_op_mem);
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dev->pxp_mode = MEI_DEV_PXP_INIT;
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}
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/* use polling */
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if (mei_me_hw_use_polling(hw)) {
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mei_disable_interrupts(dev);
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mei_clear_interrupts(dev);
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init_waitqueue_head(&hw->wait_active);
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hw->is_active = true; /* start in active mode for initialization */
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hw->polling_thread = kthread_run(mei_me_polling_thread, dev,
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"kmegscirqd/%s", dev_name(device));
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if (IS_ERR(hw->polling_thread)) {
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ret = PTR_ERR(hw->polling_thread);
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dev_err(device, "unable to create kernel thread: %d\n", ret);
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goto err;
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}
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} else {
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ret = devm_request_threaded_irq(device, hw->irq,
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mei_me_irq_quick_handler,
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mei_me_irq_thread_handler,
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IRQF_ONESHOT, KBUILD_MODNAME, dev);
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if (ret) {
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dev_err(device, "irq register failed %d\n", ret);
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goto err;
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}
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}
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pm_runtime_get_noresume(device);
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pm_runtime_set_active(device);
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pm_runtime_enable(device);
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/* Continue to char device setup in spite of firmware handshake failure.
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* In order to provide access to the firmware status registers to the user
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* space via sysfs.
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*/
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if (mei_start(dev))
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dev_warn(device, "init hw failure.\n");
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pm_runtime_set_autosuspend_delay(device, MEI_GSC_RPM_TIMEOUT);
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pm_runtime_use_autosuspend(device);
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ret = mei_register(dev, device);
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if (ret)
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goto register_err;
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pm_runtime_put_noidle(device);
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return 0;
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register_err:
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mei_stop(dev);
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if (!mei_me_hw_use_polling(hw))
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devm_free_irq(device, hw->irq, dev);
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err:
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dev_err(device, "probe failed: %d\n", ret);
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dev_set_drvdata(device, NULL);
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return ret;
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}
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static void mei_gsc_remove(struct auxiliary_device *aux_dev)
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{
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struct mei_device *dev;
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struct mei_me_hw *hw;
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dev = dev_get_drvdata(&aux_dev->dev);
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if (!dev)
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return;
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hw = to_me_hw(dev);
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mei_stop(dev);
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hw = to_me_hw(dev);
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if (mei_me_hw_use_polling(hw))
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kthread_stop(hw->polling_thread);
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mei_deregister(dev);
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pm_runtime_disable(&aux_dev->dev);
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mei_disable_interrupts(dev);
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if (!mei_me_hw_use_polling(hw))
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devm_free_irq(&aux_dev->dev, hw->irq, dev);
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}
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static int __maybe_unused mei_gsc_pm_suspend(struct device *device)
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{
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struct mei_device *dev = dev_get_drvdata(device);
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if (!dev)
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return -ENODEV;
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mei_stop(dev);
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mei_disable_interrupts(dev);
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return 0;
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}
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static int __maybe_unused mei_gsc_pm_resume(struct device *device)
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{
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struct mei_device *dev = dev_get_drvdata(device);
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struct auxiliary_device *aux_dev;
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struct mei_aux_device *adev;
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int err;
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struct mei_me_hw *hw;
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if (!dev)
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return -ENODEV;
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hw = to_me_hw(dev);
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aux_dev = to_auxiliary_dev(device);
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adev = auxiliary_dev_to_mei_aux_dev(aux_dev);
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if (adev->ext_op_mem.start) {
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mei_gsc_set_ext_op_mem(hw, &adev->ext_op_mem);
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dev->pxp_mode = MEI_DEV_PXP_INIT;
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}
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err = mei_restart(dev);
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if (err)
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return err;
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/* Start timer if stopped in suspend */
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schedule_delayed_work(&dev->timer_work, HZ);
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return 0;
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}
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static int __maybe_unused mei_gsc_pm_runtime_idle(struct device *device)
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{
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struct mei_device *dev = dev_get_drvdata(device);
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if (!dev)
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return -ENODEV;
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if (mei_write_is_idle(dev))
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pm_runtime_autosuspend(device);
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return -EBUSY;
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}
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static int __maybe_unused mei_gsc_pm_runtime_suspend(struct device *device)
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{
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struct mei_device *dev = dev_get_drvdata(device);
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struct mei_me_hw *hw;
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int ret;
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if (!dev)
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return -ENODEV;
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mutex_lock(&dev->device_lock);
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if (mei_write_is_idle(dev)) {
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hw = to_me_hw(dev);
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hw->pg_state = MEI_PG_ON;
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if (mei_me_hw_use_polling(hw))
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hw->is_active = false;
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ret = 0;
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} else {
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ret = -EAGAIN;
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}
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mutex_unlock(&dev->device_lock);
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return ret;
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}
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static int __maybe_unused mei_gsc_pm_runtime_resume(struct device *device)
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{
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struct mei_device *dev = dev_get_drvdata(device);
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struct mei_me_hw *hw;
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irqreturn_t irq_ret;
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if (!dev)
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return -ENODEV;
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mutex_lock(&dev->device_lock);
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hw = to_me_hw(dev);
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hw->pg_state = MEI_PG_OFF;
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if (mei_me_hw_use_polling(hw)) {
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hw->is_active = true;
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wake_up(&hw->wait_active);
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}
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mutex_unlock(&dev->device_lock);
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irq_ret = mei_me_irq_thread_handler(1, dev);
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if (irq_ret != IRQ_HANDLED)
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dev_err(dev->dev, "thread handler fail %d\n", irq_ret);
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return 0;
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}
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static const struct dev_pm_ops mei_gsc_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(mei_gsc_pm_suspend,
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mei_gsc_pm_resume)
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SET_RUNTIME_PM_OPS(mei_gsc_pm_runtime_suspend,
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mei_gsc_pm_runtime_resume,
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mei_gsc_pm_runtime_idle)
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};
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static const struct auxiliary_device_id mei_gsc_id_table[] = {
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{
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.name = "i915.mei-gsc",
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.driver_data = MEI_ME_GSC_CFG,
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},
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{
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.name = "i915.mei-gscfi",
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.driver_data = MEI_ME_GSCFI_CFG,
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},
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{
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/* sentinel */
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}
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};
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MODULE_DEVICE_TABLE(auxiliary, mei_gsc_id_table);
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static struct auxiliary_driver mei_gsc_driver = {
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.probe = mei_gsc_probe,
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.remove = mei_gsc_remove,
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.driver = {
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/* auxiliary_driver_register() sets .name to be the modname */
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.pm = &mei_gsc_pm_ops,
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},
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.id_table = mei_gsc_id_table
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};
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module_auxiliary_driver(mei_gsc_driver);
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MODULE_AUTHOR("Intel Corporation");
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MODULE_ALIAS("auxiliary:i915.mei-gsc");
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MODULE_ALIAS("auxiliary:i915.mei-gscfi");
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MODULE_LICENSE("GPL");
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