mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-08 09:08:05 -04:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
434
drivers/pci/pcie/aer/aerdrv.c
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434
drivers/pci/pcie/aer/aerdrv.c
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/*
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* drivers/pci/pcie/aer/aerdrv.c
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* This file implements the AER root port service driver. The driver will
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* register an irq handler. When root port triggers an AER interrupt, the irq
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* handler will collect root port status and schedule a work.
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*
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* Copyright (C) 2006 Intel Corp.
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* Tom Long Nguyen (tom.l.nguyen@intel.com)
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* Zhang Yanmin (yanmin.zhang@intel.com)
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*
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/pci-acpi.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/pm.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/pcieport_if.h>
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#include <linux/slab.h>
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#include "aerdrv.h"
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#include "../../pci.h"
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/*
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* Version Information
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*/
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#define DRIVER_VERSION "v1.0"
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#define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
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#define DRIVER_DESC "Root Port Advanced Error Reporting Driver"
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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static int aer_probe(struct pcie_device *dev);
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static void aer_remove(struct pcie_device *dev);
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static pci_ers_result_t aer_error_detected(struct pci_dev *dev,
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enum pci_channel_state error);
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static void aer_error_resume(struct pci_dev *dev);
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static pci_ers_result_t aer_root_reset(struct pci_dev *dev);
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static const struct pci_error_handlers aer_error_handlers = {
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.error_detected = aer_error_detected,
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.resume = aer_error_resume,
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};
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static struct pcie_port_service_driver aerdriver = {
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.name = "aer",
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.port_type = PCI_EXP_TYPE_ROOT_PORT,
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.service = PCIE_PORT_SERVICE_AER,
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.probe = aer_probe,
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.remove = aer_remove,
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.err_handler = &aer_error_handlers,
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.reset_link = aer_root_reset,
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};
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static int pcie_aer_disable;
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void pci_no_aer(void)
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{
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pcie_aer_disable = 1; /* has priority over 'forceload' */
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}
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bool pci_aer_available(void)
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{
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return !pcie_aer_disable && pci_msi_enabled();
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}
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static int set_device_error_reporting(struct pci_dev *dev, void *data)
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{
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bool enable = *((bool *)data);
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int type = pci_pcie_type(dev);
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if ((type == PCI_EXP_TYPE_ROOT_PORT) ||
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(type == PCI_EXP_TYPE_UPSTREAM) ||
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(type == PCI_EXP_TYPE_DOWNSTREAM)) {
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if (enable)
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pci_enable_pcie_error_reporting(dev);
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else
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pci_disable_pcie_error_reporting(dev);
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}
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if (enable)
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pcie_set_ecrc_checking(dev);
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return 0;
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}
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/**
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* set_downstream_devices_error_reporting - enable/disable the error reporting bits on the root port and its downstream ports.
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* @dev: pointer to root port's pci_dev data structure
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* @enable: true = enable error reporting, false = disable error reporting.
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*/
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static void set_downstream_devices_error_reporting(struct pci_dev *dev,
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bool enable)
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{
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set_device_error_reporting(dev, &enable);
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if (!dev->subordinate)
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return;
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pci_walk_bus(dev->subordinate, set_device_error_reporting, &enable);
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}
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/**
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* aer_enable_rootport - enable Root Port's interrupts when receiving messages
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* @rpc: pointer to a Root Port data structure
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*
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* Invoked when PCIe bus loads AER service driver.
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*/
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static void aer_enable_rootport(struct aer_rpc *rpc)
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{
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struct pci_dev *pdev = rpc->rpd->port;
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int aer_pos;
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u16 reg16;
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u32 reg32;
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/* Clear PCIe Capability's Device Status */
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pcie_capability_read_word(pdev, PCI_EXP_DEVSTA, ®16);
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pcie_capability_write_word(pdev, PCI_EXP_DEVSTA, reg16);
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/* Disable system error generation in response to error messages */
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pcie_capability_clear_word(pdev, PCI_EXP_RTCTL,
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SYSTEM_ERROR_INTR_ON_MESG_MASK);
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aer_pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
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/* Clear error status */
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pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, ®32);
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pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, reg32);
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pci_read_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, ®32);
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pci_write_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, reg32);
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pci_read_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, ®32);
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pci_write_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, reg32);
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/*
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* Enable error reporting for the root port device and downstream port
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* devices.
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*/
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set_downstream_devices_error_reporting(pdev, true);
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/* Enable Root Port's interrupt in response to error messages */
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pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_COMMAND, ®32);
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reg32 |= ROOT_PORT_INTR_ON_MESG_MASK;
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pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_COMMAND, reg32);
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}
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/**
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* aer_disable_rootport - disable Root Port's interrupts when receiving messages
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* @rpc: pointer to a Root Port data structure
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*
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* Invoked when PCIe bus unloads AER service driver.
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*/
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static void aer_disable_rootport(struct aer_rpc *rpc)
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{
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struct pci_dev *pdev = rpc->rpd->port;
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u32 reg32;
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int pos;
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/*
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* Disable error reporting for the root port device and downstream port
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* devices.
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*/
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set_downstream_devices_error_reporting(pdev, false);
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pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
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/* Disable Root's interrupt in response to error messages */
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pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, ®32);
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reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
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pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, reg32);
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/* Clear Root's error status reg */
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pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, ®32);
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pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, reg32);
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}
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/**
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* aer_irq - Root Port's ISR
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* @irq: IRQ assigned to Root Port
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* @context: pointer to Root Port data structure
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*
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* Invoked when Root Port detects AER messages.
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*/
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irqreturn_t aer_irq(int irq, void *context)
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{
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unsigned int status, id;
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struct pcie_device *pdev = (struct pcie_device *)context;
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struct aer_rpc *rpc = get_service_data(pdev);
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int next_prod_idx;
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unsigned long flags;
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int pos;
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pos = pci_find_ext_capability(pdev->port, PCI_EXT_CAP_ID_ERR);
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/*
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* Must lock access to Root Error Status Reg, Root Error ID Reg,
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* and Root error producer/consumer index
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*/
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spin_lock_irqsave(&rpc->e_lock, flags);
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/* Read error status */
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pci_read_config_dword(pdev->port, pos + PCI_ERR_ROOT_STATUS, &status);
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if (!(status & (PCI_ERR_ROOT_UNCOR_RCV|PCI_ERR_ROOT_COR_RCV))) {
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spin_unlock_irqrestore(&rpc->e_lock, flags);
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return IRQ_NONE;
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}
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/* Read error source and clear error status */
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pci_read_config_dword(pdev->port, pos + PCI_ERR_ROOT_ERR_SRC, &id);
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pci_write_config_dword(pdev->port, pos + PCI_ERR_ROOT_STATUS, status);
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/* Store error source for later DPC handler */
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next_prod_idx = rpc->prod_idx + 1;
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if (next_prod_idx == AER_ERROR_SOURCES_MAX)
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next_prod_idx = 0;
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if (next_prod_idx == rpc->cons_idx) {
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/*
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* Error Storm Condition - possibly the same error occurred.
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* Drop the error.
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*/
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spin_unlock_irqrestore(&rpc->e_lock, flags);
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return IRQ_HANDLED;
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}
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rpc->e_sources[rpc->prod_idx].status = status;
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rpc->e_sources[rpc->prod_idx].id = id;
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rpc->prod_idx = next_prod_idx;
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spin_unlock_irqrestore(&rpc->e_lock, flags);
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/* Invoke DPC handler */
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schedule_work(&rpc->dpc_handler);
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return IRQ_HANDLED;
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}
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EXPORT_SYMBOL_GPL(aer_irq);
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/**
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* aer_alloc_rpc - allocate Root Port data structure
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* @dev: pointer to the pcie_dev data structure
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*
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* Invoked when Root Port's AER service is loaded.
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*/
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static struct aer_rpc *aer_alloc_rpc(struct pcie_device *dev)
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{
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struct aer_rpc *rpc;
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rpc = kzalloc(sizeof(struct aer_rpc), GFP_KERNEL);
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if (!rpc)
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return NULL;
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/* Initialize Root lock access, e_lock, to Root Error Status Reg */
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spin_lock_init(&rpc->e_lock);
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rpc->rpd = dev;
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INIT_WORK(&rpc->dpc_handler, aer_isr);
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mutex_init(&rpc->rpc_mutex);
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init_waitqueue_head(&rpc->wait_release);
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/* Use PCIe bus function to store rpc into PCIe device */
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set_service_data(dev, rpc);
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return rpc;
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}
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/**
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* aer_remove - clean up resources
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* @dev: pointer to the pcie_dev data structure
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*
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* Invoked when PCI Express bus unloads or AER probe fails.
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*/
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static void aer_remove(struct pcie_device *dev)
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{
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struct aer_rpc *rpc = get_service_data(dev);
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if (rpc) {
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/* If register interrupt service, it must be free. */
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if (rpc->isr)
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free_irq(dev->irq, dev);
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wait_event(rpc->wait_release, rpc->prod_idx == rpc->cons_idx);
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aer_disable_rootport(rpc);
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kfree(rpc);
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set_service_data(dev, NULL);
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}
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}
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/**
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* aer_probe - initialize resources
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* @dev: pointer to the pcie_dev data structure
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* @id: pointer to the service id data structure
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*
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* Invoked when PCI Express bus loads AER service driver.
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*/
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static int aer_probe(struct pcie_device *dev)
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{
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int status;
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struct aer_rpc *rpc;
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struct device *device = &dev->device;
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/* Init */
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status = aer_init(dev);
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if (status)
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return status;
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/* Alloc rpc data structure */
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rpc = aer_alloc_rpc(dev);
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if (!rpc) {
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dev_printk(KERN_DEBUG, device, "alloc rpc failed\n");
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aer_remove(dev);
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return -ENOMEM;
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}
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/* Request IRQ ISR */
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status = request_irq(dev->irq, aer_irq, IRQF_SHARED, "aerdrv", dev);
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if (status) {
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dev_printk(KERN_DEBUG, device, "request IRQ failed\n");
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aer_remove(dev);
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return status;
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}
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rpc->isr = 1;
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aer_enable_rootport(rpc);
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return status;
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}
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/**
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* aer_root_reset - reset link on Root Port
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* @dev: pointer to Root Port's pci_dev data structure
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*
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* Invoked by Port Bus driver when performing link reset at Root Port.
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*/
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static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
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{
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u32 reg32;
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int pos;
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pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
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/* Disable Root's interrupt in response to error messages */
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pci_read_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, ®32);
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reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
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pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32);
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pci_reset_bridge_secondary_bus(dev);
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dev_printk(KERN_DEBUG, &dev->dev, "Root Port link has been reset\n");
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/* Clear Root Error Status */
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pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, ®32);
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pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, reg32);
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/* Enable Root Port's interrupt in response to error messages */
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pci_read_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, ®32);
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reg32 |= ROOT_PORT_INTR_ON_MESG_MASK;
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pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32);
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return PCI_ERS_RESULT_RECOVERED;
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}
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/**
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* aer_error_detected - update severity status
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* @dev: pointer to Root Port's pci_dev data structure
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* @error: error severity being notified by port bus
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*
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* Invoked by Port Bus driver during error recovery.
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*/
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static pci_ers_result_t aer_error_detected(struct pci_dev *dev,
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enum pci_channel_state error)
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{
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/* Root Port has no impact. Always recovers. */
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return PCI_ERS_RESULT_CAN_RECOVER;
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}
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/**
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* aer_error_resume - clean up corresponding error status bits
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* @dev: pointer to Root Port's pci_dev data structure
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*
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* Invoked by Port Bus driver during nonfatal recovery.
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*/
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static void aer_error_resume(struct pci_dev *dev)
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{
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int pos;
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u32 status, mask;
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u16 reg16;
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/* Clean up Root device status */
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pcie_capability_read_word(dev, PCI_EXP_DEVSTA, ®16);
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pcie_capability_write_word(dev, PCI_EXP_DEVSTA, reg16);
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/* Clean AER Root Error Status */
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pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
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pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
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pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &mask);
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if (dev->error_state == pci_channel_io_normal)
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status &= ~mask; /* Clear corresponding nonfatal bits */
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else
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status &= mask; /* Clear corresponding fatal bits */
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pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
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}
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/**
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* aer_service_init - register AER root service driver
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*
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* Invoked when AER root service driver is loaded.
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*/
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static int __init aer_service_init(void)
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{
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if (!pci_aer_available() || aer_acpi_firmware_first())
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return -ENXIO;
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return pcie_port_service_register(&aerdriver);
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}
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/**
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* aer_service_exit - unregister AER root service driver
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*
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* Invoked when AER root service driver is unloaded.
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*/
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static void __exit aer_service_exit(void)
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{
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pcie_port_service_unregister(&aerdriver);
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}
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module_init(aer_service_init);
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module_exit(aer_service_exit);
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