diff options
Diffstat (limited to 'drivers/net/wwan/t7xx/t7xx_pci.c')
-rw-r--r-- | drivers/net/wwan/t7xx/t7xx_pci.c | 781 |
1 files changed, 781 insertions, 0 deletions
diff --git a/drivers/net/wwan/t7xx/t7xx_pci.c b/drivers/net/wwan/t7xx/t7xx_pci.c new file mode 100644 index 000000000..91256e005 --- /dev/null +++ b/drivers/net/wwan/t7xx/t7xx_pci.c @@ -0,0 +1,781 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2021, MediaTek Inc. + * Copyright (c) 2021-2022, Intel Corporation. + * + * Authors: + * Haijun Liu <haijun.liu@mediatek.com> + * Ricardo Martinez <ricardo.martinez@linux.intel.com> + * Sreehari Kancharla <sreehari.kancharla@intel.com> + * + * Contributors: + * Amir Hanania <amir.hanania@intel.com> + * Andy Shevchenko <andriy.shevchenko@linux.intel.com> + * Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com> + * Eliot Lee <eliot.lee@intel.com> + * Moises Veleta <moises.veleta@intel.com> + */ + +#include <linux/atomic.h> +#include <linux/bits.h> +#include <linux/completion.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/gfp.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/jiffies.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/pci.h> +#include <linux/pm.h> +#include <linux/pm_runtime.h> +#include <linux/pm_wakeup.h> +#include <linux/spinlock.h> + +#include "t7xx_mhccif.h" +#include "t7xx_modem_ops.h" +#include "t7xx_pci.h" +#include "t7xx_pcie_mac.h" +#include "t7xx_reg.h" +#include "t7xx_state_monitor.h" + +#define T7XX_PCI_IREG_BASE 0 +#define T7XX_PCI_EREG_BASE 2 + +#define T7XX_INIT_TIMEOUT 20 +#define PM_SLEEP_DIS_TIMEOUT_MS 20 +#define PM_ACK_TIMEOUT_MS 1500 +#define PM_AUTOSUSPEND_MS 20000 +#define PM_RESOURCE_POLL_TIMEOUT_US 10000 +#define PM_RESOURCE_POLL_STEP_US 100 + +enum t7xx_pm_state { + MTK_PM_EXCEPTION, + MTK_PM_INIT, /* Device initialized, but handshake not completed */ + MTK_PM_SUSPENDED, + MTK_PM_RESUMED, +}; + +static void t7xx_dev_set_sleep_capability(struct t7xx_pci_dev *t7xx_dev, bool enable) +{ + void __iomem *ctrl_reg = IREG_BASE(t7xx_dev) + T7XX_PCIE_MISC_CTRL; + u32 value; + + value = ioread32(ctrl_reg); + + if (enable) + value &= ~T7XX_PCIE_MISC_MAC_SLEEP_DIS; + else + value |= T7XX_PCIE_MISC_MAC_SLEEP_DIS; + + iowrite32(value, ctrl_reg); +} + +static int t7xx_wait_pm_config(struct t7xx_pci_dev *t7xx_dev) +{ + int ret, val; + + ret = read_poll_timeout(ioread32, val, + (val & T7XX_PCIE_RESOURCE_STS_MSK) == T7XX_PCIE_RESOURCE_STS_MSK, + PM_RESOURCE_POLL_STEP_US, PM_RESOURCE_POLL_TIMEOUT_US, true, + IREG_BASE(t7xx_dev) + T7XX_PCIE_RESOURCE_STATUS); + if (ret == -ETIMEDOUT) + dev_err(&t7xx_dev->pdev->dev, "PM configuration timed out\n"); + + return ret; +} + +static int t7xx_pci_pm_init(struct t7xx_pci_dev *t7xx_dev) +{ + struct pci_dev *pdev = t7xx_dev->pdev; + + INIT_LIST_HEAD(&t7xx_dev->md_pm_entities); + mutex_init(&t7xx_dev->md_pm_entity_mtx); + spin_lock_init(&t7xx_dev->md_pm_lock); + init_completion(&t7xx_dev->sleep_lock_acquire); + init_completion(&t7xx_dev->pm_sr_ack); + init_completion(&t7xx_dev->init_done); + atomic_set(&t7xx_dev->md_pm_state, MTK_PM_INIT); + + device_init_wakeup(&pdev->dev, true); + dev_pm_set_driver_flags(&pdev->dev, pdev->dev.power.driver_flags | + DPM_FLAG_NO_DIRECT_COMPLETE); + + iowrite32(T7XX_L1_BIT(0), IREG_BASE(t7xx_dev) + DISABLE_ASPM_LOWPWR); + pm_runtime_set_autosuspend_delay(&pdev->dev, PM_AUTOSUSPEND_MS); + pm_runtime_use_autosuspend(&pdev->dev); + + return t7xx_wait_pm_config(t7xx_dev); +} + +void t7xx_pci_pm_init_late(struct t7xx_pci_dev *t7xx_dev) +{ + /* Enable the PCIe resource lock only after MD deep sleep is done */ + t7xx_mhccif_mask_clr(t7xx_dev, + D2H_INT_DS_LOCK_ACK | + D2H_INT_SUSPEND_ACK | + D2H_INT_RESUME_ACK | + D2H_INT_SUSPEND_ACK_AP | + D2H_INT_RESUME_ACK_AP); + iowrite32(T7XX_L1_BIT(0), IREG_BASE(t7xx_dev) + ENABLE_ASPM_LOWPWR); + atomic_set(&t7xx_dev->md_pm_state, MTK_PM_RESUMED); + + pm_runtime_mark_last_busy(&t7xx_dev->pdev->dev); + pm_runtime_allow(&t7xx_dev->pdev->dev); + pm_runtime_put_noidle(&t7xx_dev->pdev->dev); + complete_all(&t7xx_dev->init_done); +} + +static int t7xx_pci_pm_reinit(struct t7xx_pci_dev *t7xx_dev) +{ + /* The device is kept in FSM re-init flow + * so just roll back PM setting to the init setting. + */ + atomic_set(&t7xx_dev->md_pm_state, MTK_PM_INIT); + + pm_runtime_get_noresume(&t7xx_dev->pdev->dev); + + iowrite32(T7XX_L1_BIT(0), IREG_BASE(t7xx_dev) + DISABLE_ASPM_LOWPWR); + return t7xx_wait_pm_config(t7xx_dev); +} + +void t7xx_pci_pm_exp_detected(struct t7xx_pci_dev *t7xx_dev) +{ + iowrite32(T7XX_L1_BIT(0), IREG_BASE(t7xx_dev) + DISABLE_ASPM_LOWPWR); + t7xx_wait_pm_config(t7xx_dev); + atomic_set(&t7xx_dev->md_pm_state, MTK_PM_EXCEPTION); +} + +int t7xx_pci_pm_entity_register(struct t7xx_pci_dev *t7xx_dev, struct md_pm_entity *pm_entity) +{ + struct md_pm_entity *entity; + + mutex_lock(&t7xx_dev->md_pm_entity_mtx); + list_for_each_entry(entity, &t7xx_dev->md_pm_entities, entity) { + if (entity->id == pm_entity->id) { + mutex_unlock(&t7xx_dev->md_pm_entity_mtx); + return -EEXIST; + } + } + + list_add_tail(&pm_entity->entity, &t7xx_dev->md_pm_entities); + mutex_unlock(&t7xx_dev->md_pm_entity_mtx); + return 0; +} + +int t7xx_pci_pm_entity_unregister(struct t7xx_pci_dev *t7xx_dev, struct md_pm_entity *pm_entity) +{ + struct md_pm_entity *entity, *tmp_entity; + + mutex_lock(&t7xx_dev->md_pm_entity_mtx); + list_for_each_entry_safe(entity, tmp_entity, &t7xx_dev->md_pm_entities, entity) { + if (entity->id == pm_entity->id) { + list_del(&pm_entity->entity); + mutex_unlock(&t7xx_dev->md_pm_entity_mtx); + return 0; + } + } + + mutex_unlock(&t7xx_dev->md_pm_entity_mtx); + + return -ENXIO; +} + +int t7xx_pci_sleep_disable_complete(struct t7xx_pci_dev *t7xx_dev) +{ + struct device *dev = &t7xx_dev->pdev->dev; + int ret; + + ret = wait_for_completion_timeout(&t7xx_dev->sleep_lock_acquire, + msecs_to_jiffies(PM_SLEEP_DIS_TIMEOUT_MS)); + if (!ret) + dev_err_ratelimited(dev, "Resource wait complete timed out\n"); + + return ret; +} + +/** + * t7xx_pci_disable_sleep() - Disable deep sleep capability. + * @t7xx_dev: MTK device. + * + * Lock the deep sleep capability, note that the device can still go into deep sleep + * state while device is in D0 state, from the host's point-of-view. + * + * If device is in deep sleep state, wake up the device and disable deep sleep capability. + */ +void t7xx_pci_disable_sleep(struct t7xx_pci_dev *t7xx_dev) +{ + unsigned long flags; + + spin_lock_irqsave(&t7xx_dev->md_pm_lock, flags); + t7xx_dev->sleep_disable_count++; + if (atomic_read(&t7xx_dev->md_pm_state) < MTK_PM_RESUMED) + goto unlock_and_complete; + + if (t7xx_dev->sleep_disable_count == 1) { + u32 status; + + reinit_completion(&t7xx_dev->sleep_lock_acquire); + t7xx_dev_set_sleep_capability(t7xx_dev, false); + + status = ioread32(IREG_BASE(t7xx_dev) + T7XX_PCIE_RESOURCE_STATUS); + if (status & T7XX_PCIE_RESOURCE_STS_MSK) + goto unlock_and_complete; + + t7xx_mhccif_h2d_swint_trigger(t7xx_dev, H2D_CH_DS_LOCK); + } + spin_unlock_irqrestore(&t7xx_dev->md_pm_lock, flags); + return; + +unlock_and_complete: + spin_unlock_irqrestore(&t7xx_dev->md_pm_lock, flags); + complete_all(&t7xx_dev->sleep_lock_acquire); +} + +/** + * t7xx_pci_enable_sleep() - Enable deep sleep capability. + * @t7xx_dev: MTK device. + * + * After enabling deep sleep, device can enter into deep sleep state. + */ +void t7xx_pci_enable_sleep(struct t7xx_pci_dev *t7xx_dev) +{ + unsigned long flags; + + spin_lock_irqsave(&t7xx_dev->md_pm_lock, flags); + t7xx_dev->sleep_disable_count--; + if (atomic_read(&t7xx_dev->md_pm_state) < MTK_PM_RESUMED) + goto unlock; + + if (t7xx_dev->sleep_disable_count == 0) + t7xx_dev_set_sleep_capability(t7xx_dev, true); + +unlock: + spin_unlock_irqrestore(&t7xx_dev->md_pm_lock, flags); +} + +static int t7xx_send_pm_request(struct t7xx_pci_dev *t7xx_dev, u32 request) +{ + unsigned long wait_ret; + + reinit_completion(&t7xx_dev->pm_sr_ack); + t7xx_mhccif_h2d_swint_trigger(t7xx_dev, request); + wait_ret = wait_for_completion_timeout(&t7xx_dev->pm_sr_ack, + msecs_to_jiffies(PM_ACK_TIMEOUT_MS)); + if (!wait_ret) + return -ETIMEDOUT; + + return 0; +} + +static int __t7xx_pci_pm_suspend(struct pci_dev *pdev) +{ + enum t7xx_pm_id entity_id = PM_ENTITY_ID_INVALID; + struct t7xx_pci_dev *t7xx_dev; + struct md_pm_entity *entity; + int ret; + + t7xx_dev = pci_get_drvdata(pdev); + if (atomic_read(&t7xx_dev->md_pm_state) <= MTK_PM_INIT) { + dev_err(&pdev->dev, "[PM] Exiting suspend, modem in invalid state\n"); + return -EFAULT; + } + + iowrite32(T7XX_L1_BIT(0), IREG_BASE(t7xx_dev) + DISABLE_ASPM_LOWPWR); + ret = t7xx_wait_pm_config(t7xx_dev); + if (ret) { + iowrite32(T7XX_L1_BIT(0), IREG_BASE(t7xx_dev) + ENABLE_ASPM_LOWPWR); + return ret; + } + + atomic_set(&t7xx_dev->md_pm_state, MTK_PM_SUSPENDED); + t7xx_pcie_mac_clear_int(t7xx_dev, SAP_RGU_INT); + t7xx_dev->rgu_pci_irq_en = false; + + list_for_each_entry(entity, &t7xx_dev->md_pm_entities, entity) { + if (!entity->suspend) + continue; + + ret = entity->suspend(t7xx_dev, entity->entity_param); + if (ret) { + entity_id = entity->id; + dev_err(&pdev->dev, "[PM] Suspend error: %d, id: %d\n", ret, entity_id); + goto abort_suspend; + } + } + + ret = t7xx_send_pm_request(t7xx_dev, H2D_CH_SUSPEND_REQ); + if (ret) { + dev_err(&pdev->dev, "[PM] MD suspend error: %d\n", ret); + goto abort_suspend; + } + + ret = t7xx_send_pm_request(t7xx_dev, H2D_CH_SUSPEND_REQ_AP); + if (ret) { + t7xx_send_pm_request(t7xx_dev, H2D_CH_RESUME_REQ); + dev_err(&pdev->dev, "[PM] SAP suspend error: %d\n", ret); + goto abort_suspend; + } + + list_for_each_entry(entity, &t7xx_dev->md_pm_entities, entity) { + if (entity->suspend_late) + entity->suspend_late(t7xx_dev, entity->entity_param); + } + + iowrite32(T7XX_L1_BIT(0), IREG_BASE(t7xx_dev) + ENABLE_ASPM_LOWPWR); + return 0; + +abort_suspend: + list_for_each_entry(entity, &t7xx_dev->md_pm_entities, entity) { + if (entity_id == entity->id) + break; + + if (entity->resume) + entity->resume(t7xx_dev, entity->entity_param); + } + + iowrite32(T7XX_L1_BIT(0), IREG_BASE(t7xx_dev) + ENABLE_ASPM_LOWPWR); + atomic_set(&t7xx_dev->md_pm_state, MTK_PM_RESUMED); + t7xx_pcie_mac_set_int(t7xx_dev, SAP_RGU_INT); + return ret; +} + +static void t7xx_pcie_interrupt_reinit(struct t7xx_pci_dev *t7xx_dev) +{ + t7xx_pcie_set_mac_msix_cfg(t7xx_dev, EXT_INT_NUM); + + /* Disable interrupt first and let the IPs enable them */ + iowrite32(MSIX_MSK_SET_ALL, IREG_BASE(t7xx_dev) + IMASK_HOST_MSIX_CLR_GRP0_0); + + /* Device disables PCIe interrupts during resume and + * following function will re-enable PCIe interrupts. + */ + t7xx_pcie_mac_interrupts_en(t7xx_dev); + t7xx_pcie_mac_set_int(t7xx_dev, MHCCIF_INT); +} + +static int t7xx_pcie_reinit(struct t7xx_pci_dev *t7xx_dev, bool is_d3) +{ + int ret; + + ret = pcim_enable_device(t7xx_dev->pdev); + if (ret) + return ret; + + t7xx_pcie_mac_atr_init(t7xx_dev); + t7xx_pcie_interrupt_reinit(t7xx_dev); + + if (is_d3) { + t7xx_mhccif_init(t7xx_dev); + return t7xx_pci_pm_reinit(t7xx_dev); + } + + return 0; +} + +static int t7xx_send_fsm_command(struct t7xx_pci_dev *t7xx_dev, u32 event) +{ + struct t7xx_fsm_ctl *fsm_ctl = t7xx_dev->md->fsm_ctl; + struct device *dev = &t7xx_dev->pdev->dev; + int ret = -EINVAL; + + switch (event) { + case FSM_CMD_STOP: + ret = t7xx_fsm_append_cmd(fsm_ctl, FSM_CMD_STOP, FSM_CMD_FLAG_WAIT_FOR_COMPLETION); + break; + + case FSM_CMD_START: + t7xx_pcie_mac_clear_int(t7xx_dev, SAP_RGU_INT); + t7xx_pcie_mac_clear_int_status(t7xx_dev, SAP_RGU_INT); + t7xx_dev->rgu_pci_irq_en = true; + t7xx_pcie_mac_set_int(t7xx_dev, SAP_RGU_INT); + ret = t7xx_fsm_append_cmd(fsm_ctl, FSM_CMD_START, 0); + break; + + default: + break; + } + + if (ret) + dev_err(dev, "Failure handling FSM command %u, %d\n", event, ret); + + return ret; +} + +static int __t7xx_pci_pm_resume(struct pci_dev *pdev, bool state_check) +{ + struct t7xx_pci_dev *t7xx_dev; + struct md_pm_entity *entity; + u32 prev_state; + int ret = 0; + + t7xx_dev = pci_get_drvdata(pdev); + if (atomic_read(&t7xx_dev->md_pm_state) <= MTK_PM_INIT) { + iowrite32(T7XX_L1_BIT(0), IREG_BASE(t7xx_dev) + ENABLE_ASPM_LOWPWR); + return 0; + } + + t7xx_pcie_mac_interrupts_en(t7xx_dev); + prev_state = ioread32(IREG_BASE(t7xx_dev) + T7XX_PCIE_PM_RESUME_STATE); + + if (state_check) { + /* For D3/L3 resume, the device could boot so quickly that the + * initial value of the dummy register might be overwritten. + * Identify new boots if the ATR source address register is not initialized. + */ + u32 atr_reg_val = ioread32(IREG_BASE(t7xx_dev) + + ATR_PCIE_WIN0_T0_ATR_PARAM_SRC_ADDR); + if (prev_state == PM_RESUME_REG_STATE_L3 || + (prev_state == PM_RESUME_REG_STATE_INIT && + atr_reg_val == ATR_SRC_ADDR_INVALID)) { + ret = t7xx_send_fsm_command(t7xx_dev, FSM_CMD_STOP); + if (ret) + return ret; + + ret = t7xx_pcie_reinit(t7xx_dev, true); + if (ret) + return ret; + + t7xx_clear_rgu_irq(t7xx_dev); + return t7xx_send_fsm_command(t7xx_dev, FSM_CMD_START); + } + + if (prev_state == PM_RESUME_REG_STATE_EXP || + prev_state == PM_RESUME_REG_STATE_L2_EXP) { + if (prev_state == PM_RESUME_REG_STATE_L2_EXP) { + ret = t7xx_pcie_reinit(t7xx_dev, false); + if (ret) + return ret; + } + + atomic_set(&t7xx_dev->md_pm_state, MTK_PM_SUSPENDED); + t7xx_dev->rgu_pci_irq_en = true; + t7xx_pcie_mac_set_int(t7xx_dev, SAP_RGU_INT); + + t7xx_mhccif_mask_clr(t7xx_dev, + D2H_INT_EXCEPTION_INIT | + D2H_INT_EXCEPTION_INIT_DONE | + D2H_INT_EXCEPTION_CLEARQ_DONE | + D2H_INT_EXCEPTION_ALLQ_RESET | + D2H_INT_PORT_ENUM); + + return ret; + } + + if (prev_state == PM_RESUME_REG_STATE_L2) { + ret = t7xx_pcie_reinit(t7xx_dev, false); + if (ret) + return ret; + + } else if (prev_state != PM_RESUME_REG_STATE_L1 && + prev_state != PM_RESUME_REG_STATE_INIT) { + ret = t7xx_send_fsm_command(t7xx_dev, FSM_CMD_STOP); + if (ret) + return ret; + + t7xx_clear_rgu_irq(t7xx_dev); + atomic_set(&t7xx_dev->md_pm_state, MTK_PM_SUSPENDED); + return 0; + } + } + + iowrite32(T7XX_L1_BIT(0), IREG_BASE(t7xx_dev) + DISABLE_ASPM_LOWPWR); + t7xx_wait_pm_config(t7xx_dev); + + list_for_each_entry(entity, &t7xx_dev->md_pm_entities, entity) { + if (entity->resume_early) + entity->resume_early(t7xx_dev, entity->entity_param); + } + + ret = t7xx_send_pm_request(t7xx_dev, H2D_CH_RESUME_REQ); + if (ret) + dev_err(&pdev->dev, "[PM] MD resume error: %d\n", ret); + + ret = t7xx_send_pm_request(t7xx_dev, H2D_CH_RESUME_REQ_AP); + if (ret) + dev_err(&pdev->dev, "[PM] SAP resume error: %d\n", ret); + + list_for_each_entry(entity, &t7xx_dev->md_pm_entities, entity) { + if (entity->resume) { + ret = entity->resume(t7xx_dev, entity->entity_param); + if (ret) + dev_err(&pdev->dev, "[PM] Resume entry ID: %d error: %d\n", + entity->id, ret); + } + } + + t7xx_dev->rgu_pci_irq_en = true; + t7xx_pcie_mac_set_int(t7xx_dev, SAP_RGU_INT); + iowrite32(T7XX_L1_BIT(0), IREG_BASE(t7xx_dev) + ENABLE_ASPM_LOWPWR); + pm_runtime_mark_last_busy(&pdev->dev); + atomic_set(&t7xx_dev->md_pm_state, MTK_PM_RESUMED); + + return ret; +} + +static int t7xx_pci_pm_resume_noirq(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct t7xx_pci_dev *t7xx_dev; + + t7xx_dev = pci_get_drvdata(pdev); + t7xx_pcie_mac_interrupts_dis(t7xx_dev); + + return 0; +} + +static void t7xx_pci_shutdown(struct pci_dev *pdev) +{ + __t7xx_pci_pm_suspend(pdev); +} + +static int t7xx_pci_pm_prepare(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct t7xx_pci_dev *t7xx_dev; + + t7xx_dev = pci_get_drvdata(pdev); + if (!wait_for_completion_timeout(&t7xx_dev->init_done, T7XX_INIT_TIMEOUT * HZ)) { + dev_warn(dev, "Not ready for system sleep.\n"); + return -ETIMEDOUT; + } + + return 0; +} + +static int t7xx_pci_pm_suspend(struct device *dev) +{ + return __t7xx_pci_pm_suspend(to_pci_dev(dev)); +} + +static int t7xx_pci_pm_resume(struct device *dev) +{ + return __t7xx_pci_pm_resume(to_pci_dev(dev), true); +} + +static int t7xx_pci_pm_thaw(struct device *dev) +{ + return __t7xx_pci_pm_resume(to_pci_dev(dev), false); +} + +static int t7xx_pci_pm_runtime_suspend(struct device *dev) +{ + return __t7xx_pci_pm_suspend(to_pci_dev(dev)); +} + +static int t7xx_pci_pm_runtime_resume(struct device *dev) +{ + return __t7xx_pci_pm_resume(to_pci_dev(dev), true); +} + +static const struct dev_pm_ops t7xx_pci_pm_ops = { + .prepare = t7xx_pci_pm_prepare, + .suspend = t7xx_pci_pm_suspend, + .resume = t7xx_pci_pm_resume, + .resume_noirq = t7xx_pci_pm_resume_noirq, + .freeze = t7xx_pci_pm_suspend, + .thaw = t7xx_pci_pm_thaw, + .poweroff = t7xx_pci_pm_suspend, + .restore = t7xx_pci_pm_resume, + .restore_noirq = t7xx_pci_pm_resume_noirq, + .runtime_suspend = t7xx_pci_pm_runtime_suspend, + .runtime_resume = t7xx_pci_pm_runtime_resume +}; + +static int t7xx_request_irq(struct pci_dev *pdev) +{ + struct t7xx_pci_dev *t7xx_dev; + int ret = 0, i; + + t7xx_dev = pci_get_drvdata(pdev); + + for (i = 0; i < EXT_INT_NUM; i++) { + const char *irq_descr; + int irq_vec; + + if (!t7xx_dev->intr_handler[i]) + continue; + + irq_descr = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s_%d", + dev_driver_string(&pdev->dev), i); + if (!irq_descr) { + ret = -ENOMEM; + break; + } + + irq_vec = pci_irq_vector(pdev, i); + ret = request_threaded_irq(irq_vec, t7xx_dev->intr_handler[i], + t7xx_dev->intr_thread[i], 0, irq_descr, + t7xx_dev->callback_param[i]); + if (ret) { + dev_err(&pdev->dev, "Failed to request IRQ: %d\n", ret); + break; + } + } + + if (ret) { + while (i--) { + if (!t7xx_dev->intr_handler[i]) + continue; + + free_irq(pci_irq_vector(pdev, i), t7xx_dev->callback_param[i]); + } + } + + return ret; +} + +static int t7xx_setup_msix(struct t7xx_pci_dev *t7xx_dev) +{ + struct pci_dev *pdev = t7xx_dev->pdev; + int ret; + + /* Only using 6 interrupts, but HW-design requires power-of-2 IRQs allocation */ + ret = pci_alloc_irq_vectors(pdev, EXT_INT_NUM, EXT_INT_NUM, PCI_IRQ_MSIX); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to allocate MSI-X entry: %d\n", ret); + return ret; + } + + ret = t7xx_request_irq(pdev); + if (ret) { + pci_free_irq_vectors(pdev); + return ret; + } + + t7xx_pcie_set_mac_msix_cfg(t7xx_dev, EXT_INT_NUM); + return 0; +} + +static int t7xx_interrupt_init(struct t7xx_pci_dev *t7xx_dev) +{ + int ret, i; + + if (!t7xx_dev->pdev->msix_cap) + return -EINVAL; + + ret = t7xx_setup_msix(t7xx_dev); + if (ret) + return ret; + + /* IPs enable interrupts when ready */ + for (i = 0; i < EXT_INT_NUM; i++) + t7xx_pcie_mac_set_int(t7xx_dev, i); + + return 0; +} + +static void t7xx_pci_infracfg_ao_calc(struct t7xx_pci_dev *t7xx_dev) +{ + t7xx_dev->base_addr.infracfg_ao_base = t7xx_dev->base_addr.pcie_ext_reg_base + + INFRACFG_AO_DEV_CHIP - + t7xx_dev->base_addr.pcie_dev_reg_trsl_addr; +} + +static int t7xx_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) +{ + struct t7xx_pci_dev *t7xx_dev; + int ret; + + t7xx_dev = devm_kzalloc(&pdev->dev, sizeof(*t7xx_dev), GFP_KERNEL); + if (!t7xx_dev) + return -ENOMEM; + + pci_set_drvdata(pdev, t7xx_dev); + t7xx_dev->pdev = pdev; + + ret = pcim_enable_device(pdev); + if (ret) + return ret; + + pci_set_master(pdev); + + ret = pcim_iomap_regions(pdev, BIT(T7XX_PCI_IREG_BASE) | BIT(T7XX_PCI_EREG_BASE), + pci_name(pdev)); + if (ret) { + dev_err(&pdev->dev, "Could not request BARs: %d\n", ret); + return -ENOMEM; + } + + ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)); + if (ret) { + dev_err(&pdev->dev, "Could not set PCI DMA mask: %d\n", ret); + return ret; + } + + ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64)); + if (ret) { + dev_err(&pdev->dev, "Could not set consistent PCI DMA mask: %d\n", ret); + return ret; + } + + IREG_BASE(t7xx_dev) = pcim_iomap_table(pdev)[T7XX_PCI_IREG_BASE]; + t7xx_dev->base_addr.pcie_ext_reg_base = pcim_iomap_table(pdev)[T7XX_PCI_EREG_BASE]; + + ret = t7xx_pci_pm_init(t7xx_dev); + if (ret) + return ret; + + t7xx_pcie_mac_atr_init(t7xx_dev); + t7xx_pci_infracfg_ao_calc(t7xx_dev); + t7xx_mhccif_init(t7xx_dev); + + ret = t7xx_md_init(t7xx_dev); + if (ret) + return ret; + + t7xx_pcie_mac_interrupts_dis(t7xx_dev); + + ret = t7xx_interrupt_init(t7xx_dev); + if (ret) { + t7xx_md_exit(t7xx_dev); + return ret; + } + + t7xx_pcie_mac_set_int(t7xx_dev, MHCCIF_INT); + t7xx_pcie_mac_interrupts_en(t7xx_dev); + + return 0; +} + +static void t7xx_pci_remove(struct pci_dev *pdev) +{ + struct t7xx_pci_dev *t7xx_dev; + int i; + + t7xx_dev = pci_get_drvdata(pdev); + t7xx_md_exit(t7xx_dev); + + for (i = 0; i < EXT_INT_NUM; i++) { + if (!t7xx_dev->intr_handler[i]) + continue; + + free_irq(pci_irq_vector(pdev, i), t7xx_dev->callback_param[i]); + } + + pci_free_irq_vectors(t7xx_dev->pdev); +} + +static const struct pci_device_id t7xx_pci_table[] = { + { PCI_DEVICE(PCI_VENDOR_ID_MEDIATEK, 0x4d75) }, + { } +}; +MODULE_DEVICE_TABLE(pci, t7xx_pci_table); + +static struct pci_driver t7xx_pci_driver = { + .name = "mtk_t7xx", + .id_table = t7xx_pci_table, + .probe = t7xx_pci_probe, + .remove = t7xx_pci_remove, + .driver.pm = &t7xx_pci_pm_ops, + .shutdown = t7xx_pci_shutdown, +}; + +module_pci_driver(t7xx_pci_driver); + +MODULE_AUTHOR("MediaTek Inc"); +MODULE_DESCRIPTION("MediaTek PCIe 5G WWAN modem T7xx driver"); +MODULE_LICENSE("GPL"); |