18cfab3cfSBjorn Helgaas // SPDX-License-Identifier: GPL-2.0 25e8cb403SKishon Vijay Abraham I /** 35e8cb403SKishon Vijay Abraham I * PCI Endpoint *Controller* (EPC) library 45e8cb403SKishon Vijay Abraham I * 55e8cb403SKishon Vijay Abraham I * Copyright (C) 2017 Texas Instruments 65e8cb403SKishon Vijay Abraham I * Author: Kishon Vijay Abraham I <kishon@ti.com> 75e8cb403SKishon Vijay Abraham I */ 85e8cb403SKishon Vijay Abraham I 95e8cb403SKishon Vijay Abraham I #include <linux/device.h> 105e8cb403SKishon Vijay Abraham I #include <linux/slab.h> 115e8cb403SKishon Vijay Abraham I #include <linux/module.h> 1264c1a02aSKishon Vijay Abraham I #include <linux/of_device.h> 135e8cb403SKishon Vijay Abraham I 145e8cb403SKishon Vijay Abraham I #include <linux/pci-epc.h> 155e8cb403SKishon Vijay Abraham I #include <linux/pci-epf.h> 163a401a2cSKishon Vijay Abraham I #include <linux/pci-ep-cfs.h> 175e8cb403SKishon Vijay Abraham I 185e8cb403SKishon Vijay Abraham I static struct class *pci_epc_class; 195e8cb403SKishon Vijay Abraham I 205e8cb403SKishon Vijay Abraham I static void devm_pci_epc_release(struct device *dev, void *res) 215e8cb403SKishon Vijay Abraham I { 225e8cb403SKishon Vijay Abraham I struct pci_epc *epc = *(struct pci_epc **)res; 235e8cb403SKishon Vijay Abraham I 245e8cb403SKishon Vijay Abraham I pci_epc_destroy(epc); 255e8cb403SKishon Vijay Abraham I } 265e8cb403SKishon Vijay Abraham I 275e8cb403SKishon Vijay Abraham I static int devm_pci_epc_match(struct device *dev, void *res, void *match_data) 285e8cb403SKishon Vijay Abraham I { 295e8cb403SKishon Vijay Abraham I struct pci_epc **epc = res; 305e8cb403SKishon Vijay Abraham I 315e8cb403SKishon Vijay Abraham I return *epc == match_data; 325e8cb403SKishon Vijay Abraham I } 335e8cb403SKishon Vijay Abraham I 345e8cb403SKishon Vijay Abraham I /** 355e8cb403SKishon Vijay Abraham I * pci_epc_put() - release the PCI endpoint controller 365e8cb403SKishon Vijay Abraham I * @epc: epc returned by pci_epc_get() 375e8cb403SKishon Vijay Abraham I * 385e8cb403SKishon Vijay Abraham I * release the refcount the caller obtained by invoking pci_epc_get() 395e8cb403SKishon Vijay Abraham I */ 405e8cb403SKishon Vijay Abraham I void pci_epc_put(struct pci_epc *epc) 415e8cb403SKishon Vijay Abraham I { 425e8cb403SKishon Vijay Abraham I if (!epc || IS_ERR(epc)) 435e8cb403SKishon Vijay Abraham I return; 445e8cb403SKishon Vijay Abraham I 455e8cb403SKishon Vijay Abraham I module_put(epc->ops->owner); 465e8cb403SKishon Vijay Abraham I put_device(&epc->dev); 475e8cb403SKishon Vijay Abraham I } 485e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_put); 495e8cb403SKishon Vijay Abraham I 505e8cb403SKishon Vijay Abraham I /** 515e8cb403SKishon Vijay Abraham I * pci_epc_get() - get the PCI endpoint controller 525e8cb403SKishon Vijay Abraham I * @epc_name: device name of the endpoint controller 535e8cb403SKishon Vijay Abraham I * 545e8cb403SKishon Vijay Abraham I * Invoke to get struct pci_epc * corresponding to the device name of the 555e8cb403SKishon Vijay Abraham I * endpoint controller 565e8cb403SKishon Vijay Abraham I */ 575e8cb403SKishon Vijay Abraham I struct pci_epc *pci_epc_get(const char *epc_name) 585e8cb403SKishon Vijay Abraham I { 595e8cb403SKishon Vijay Abraham I int ret = -EINVAL; 605e8cb403SKishon Vijay Abraham I struct pci_epc *epc; 615e8cb403SKishon Vijay Abraham I struct device *dev; 625e8cb403SKishon Vijay Abraham I struct class_dev_iter iter; 635e8cb403SKishon Vijay Abraham I 645e8cb403SKishon Vijay Abraham I class_dev_iter_init(&iter, pci_epc_class, NULL, NULL); 655e8cb403SKishon Vijay Abraham I while ((dev = class_dev_iter_next(&iter))) { 665e8cb403SKishon Vijay Abraham I if (strcmp(epc_name, dev_name(dev))) 675e8cb403SKishon Vijay Abraham I continue; 685e8cb403SKishon Vijay Abraham I 695e8cb403SKishon Vijay Abraham I epc = to_pci_epc(dev); 705e8cb403SKishon Vijay Abraham I if (!try_module_get(epc->ops->owner)) { 715e8cb403SKishon Vijay Abraham I ret = -EINVAL; 725e8cb403SKishon Vijay Abraham I goto err; 735e8cb403SKishon Vijay Abraham I } 745e8cb403SKishon Vijay Abraham I 755e8cb403SKishon Vijay Abraham I class_dev_iter_exit(&iter); 765e8cb403SKishon Vijay Abraham I get_device(&epc->dev); 775e8cb403SKishon Vijay Abraham I return epc; 785e8cb403SKishon Vijay Abraham I } 795e8cb403SKishon Vijay Abraham I 805e8cb403SKishon Vijay Abraham I err: 815e8cb403SKishon Vijay Abraham I class_dev_iter_exit(&iter); 825e8cb403SKishon Vijay Abraham I return ERR_PTR(ret); 835e8cb403SKishon Vijay Abraham I } 845e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_get); 855e8cb403SKishon Vijay Abraham I 865e8cb403SKishon Vijay Abraham I /** 8741cb8d18SKishon Vijay Abraham I * pci_epc_get_features() - get the features supported by EPC 8841cb8d18SKishon Vijay Abraham I * @epc: the features supported by *this* EPC device will be returned 8941cb8d18SKishon Vijay Abraham I * @func_no: the features supported by the EPC device specific to the 9041cb8d18SKishon Vijay Abraham I * endpoint function with func_no will be returned 9141cb8d18SKishon Vijay Abraham I * 9241cb8d18SKishon Vijay Abraham I * Invoke to get the features provided by the EPC which may be 9341cb8d18SKishon Vijay Abraham I * specific to an endpoint function. Returns pci_epc_features on success 9441cb8d18SKishon Vijay Abraham I * and NULL for any failures. 9541cb8d18SKishon Vijay Abraham I */ 9641cb8d18SKishon Vijay Abraham I const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc, 9741cb8d18SKishon Vijay Abraham I u8 func_no) 9841cb8d18SKishon Vijay Abraham I { 9941cb8d18SKishon Vijay Abraham I const struct pci_epc_features *epc_features; 10041cb8d18SKishon Vijay Abraham I unsigned long flags; 10141cb8d18SKishon Vijay Abraham I 10241cb8d18SKishon Vijay Abraham I if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 10341cb8d18SKishon Vijay Abraham I return NULL; 10441cb8d18SKishon Vijay Abraham I 10541cb8d18SKishon Vijay Abraham I if (!epc->ops->get_features) 10641cb8d18SKishon Vijay Abraham I return NULL; 10741cb8d18SKishon Vijay Abraham I 10841cb8d18SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 10941cb8d18SKishon Vijay Abraham I epc_features = epc->ops->get_features(epc, func_no); 11041cb8d18SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 11141cb8d18SKishon Vijay Abraham I 11241cb8d18SKishon Vijay Abraham I return epc_features; 11341cb8d18SKishon Vijay Abraham I } 11441cb8d18SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_get_features); 11541cb8d18SKishon Vijay Abraham I 11641cb8d18SKishon Vijay Abraham I /** 1175e8cb403SKishon Vijay Abraham I * pci_epc_stop() - stop the PCI link 1185e8cb403SKishon Vijay Abraham I * @epc: the link of the EPC device that has to be stopped 1195e8cb403SKishon Vijay Abraham I * 1205e8cb403SKishon Vijay Abraham I * Invoke to stop the PCI link 1215e8cb403SKishon Vijay Abraham I */ 1225e8cb403SKishon Vijay Abraham I void pci_epc_stop(struct pci_epc *epc) 1235e8cb403SKishon Vijay Abraham I { 1245e8cb403SKishon Vijay Abraham I unsigned long flags; 1255e8cb403SKishon Vijay Abraham I 1265e8cb403SKishon Vijay Abraham I if (IS_ERR(epc) || !epc->ops->stop) 1275e8cb403SKishon Vijay Abraham I return; 1285e8cb403SKishon Vijay Abraham I 1295e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 1305e8cb403SKishon Vijay Abraham I epc->ops->stop(epc); 1315e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 1325e8cb403SKishon Vijay Abraham I } 1335e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_stop); 1345e8cb403SKishon Vijay Abraham I 1355e8cb403SKishon Vijay Abraham I /** 1365e8cb403SKishon Vijay Abraham I * pci_epc_start() - start the PCI link 1375e8cb403SKishon Vijay Abraham I * @epc: the link of *this* EPC device has to be started 1385e8cb403SKishon Vijay Abraham I * 1395e8cb403SKishon Vijay Abraham I * Invoke to start the PCI link 1405e8cb403SKishon Vijay Abraham I */ 1415e8cb403SKishon Vijay Abraham I int pci_epc_start(struct pci_epc *epc) 1425e8cb403SKishon Vijay Abraham I { 1435e8cb403SKishon Vijay Abraham I int ret; 1445e8cb403SKishon Vijay Abraham I unsigned long flags; 1455e8cb403SKishon Vijay Abraham I 1465e8cb403SKishon Vijay Abraham I if (IS_ERR(epc)) 1475e8cb403SKishon Vijay Abraham I return -EINVAL; 1485e8cb403SKishon Vijay Abraham I 1495e8cb403SKishon Vijay Abraham I if (!epc->ops->start) 1505e8cb403SKishon Vijay Abraham I return 0; 1515e8cb403SKishon Vijay Abraham I 1525e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 1535e8cb403SKishon Vijay Abraham I ret = epc->ops->start(epc); 1545e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 1555e8cb403SKishon Vijay Abraham I 1565e8cb403SKishon Vijay Abraham I return ret; 1575e8cb403SKishon Vijay Abraham I } 1585e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_start); 1595e8cb403SKishon Vijay Abraham I 1605e8cb403SKishon Vijay Abraham I /** 1615e8cb403SKishon Vijay Abraham I * pci_epc_raise_irq() - interrupt the host system 1625e8cb403SKishon Vijay Abraham I * @epc: the EPC device which has to interrupt the host 1634494738dSCyrille Pitchen * @func_no: the endpoint function number in the EPC device 164d3c70a98SGustavo Pimentel * @type: specify the type of interrupt; legacy, MSI or MSI-X 165d3c70a98SGustavo Pimentel * @interrupt_num: the MSI or MSI-X interrupt number 1665e8cb403SKishon Vijay Abraham I * 167d3c70a98SGustavo Pimentel * Invoke to raise an legacy, MSI or MSI-X interrupt 1685e8cb403SKishon Vijay Abraham I */ 1694494738dSCyrille Pitchen int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no, 170d3c70a98SGustavo Pimentel enum pci_epc_irq_type type, u16 interrupt_num) 1715e8cb403SKishon Vijay Abraham I { 1725e8cb403SKishon Vijay Abraham I int ret; 1735e8cb403SKishon Vijay Abraham I unsigned long flags; 1745e8cb403SKishon Vijay Abraham I 1754494738dSCyrille Pitchen if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 1765e8cb403SKishon Vijay Abraham I return -EINVAL; 1775e8cb403SKishon Vijay Abraham I 1785e8cb403SKishon Vijay Abraham I if (!epc->ops->raise_irq) 1795e8cb403SKishon Vijay Abraham I return 0; 1805e8cb403SKishon Vijay Abraham I 1815e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 1824494738dSCyrille Pitchen ret = epc->ops->raise_irq(epc, func_no, type, interrupt_num); 1835e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 1845e8cb403SKishon Vijay Abraham I 1855e8cb403SKishon Vijay Abraham I return ret; 1865e8cb403SKishon Vijay Abraham I } 1875e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_raise_irq); 1885e8cb403SKishon Vijay Abraham I 1895e8cb403SKishon Vijay Abraham I /** 1905e8cb403SKishon Vijay Abraham I * pci_epc_get_msi() - get the number of MSI interrupt numbers allocated 1915e8cb403SKishon Vijay Abraham I * @epc: the EPC device to which MSI interrupts was requested 1924494738dSCyrille Pitchen * @func_no: the endpoint function number in the EPC device 1935e8cb403SKishon Vijay Abraham I * 1945e8cb403SKishon Vijay Abraham I * Invoke to get the number of MSI interrupts allocated by the RC 1955e8cb403SKishon Vijay Abraham I */ 1964494738dSCyrille Pitchen int pci_epc_get_msi(struct pci_epc *epc, u8 func_no) 1975e8cb403SKishon Vijay Abraham I { 1985e8cb403SKishon Vijay Abraham I int interrupt; 1995e8cb403SKishon Vijay Abraham I unsigned long flags; 2005e8cb403SKishon Vijay Abraham I 2014494738dSCyrille Pitchen if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 2025e8cb403SKishon Vijay Abraham I return 0; 2035e8cb403SKishon Vijay Abraham I 2045e8cb403SKishon Vijay Abraham I if (!epc->ops->get_msi) 2055e8cb403SKishon Vijay Abraham I return 0; 2065e8cb403SKishon Vijay Abraham I 2075e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 2084494738dSCyrille Pitchen interrupt = epc->ops->get_msi(epc, func_no); 2095e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 2105e8cb403SKishon Vijay Abraham I 2115e8cb403SKishon Vijay Abraham I if (interrupt < 0) 2125e8cb403SKishon Vijay Abraham I return 0; 2135e8cb403SKishon Vijay Abraham I 2145e8cb403SKishon Vijay Abraham I interrupt = 1 << interrupt; 2155e8cb403SKishon Vijay Abraham I 2165e8cb403SKishon Vijay Abraham I return interrupt; 2175e8cb403SKishon Vijay Abraham I } 2185e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_get_msi); 2195e8cb403SKishon Vijay Abraham I 2205e8cb403SKishon Vijay Abraham I /** 2215e8cb403SKishon Vijay Abraham I * pci_epc_set_msi() - set the number of MSI interrupt numbers required 2225e8cb403SKishon Vijay Abraham I * @epc: the EPC device on which MSI has to be configured 2234494738dSCyrille Pitchen * @func_no: the endpoint function number in the EPC device 2245e8cb403SKishon Vijay Abraham I * @interrupts: number of MSI interrupts required by the EPF 2255e8cb403SKishon Vijay Abraham I * 2265e8cb403SKishon Vijay Abraham I * Invoke to set the required number of MSI interrupts. 2275e8cb403SKishon Vijay Abraham I */ 2284494738dSCyrille Pitchen int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts) 2295e8cb403SKishon Vijay Abraham I { 2305e8cb403SKishon Vijay Abraham I int ret; 2315e8cb403SKishon Vijay Abraham I u8 encode_int; 2325e8cb403SKishon Vijay Abraham I unsigned long flags; 2335e8cb403SKishon Vijay Abraham I 23415c972dfSGustavo Pimentel if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions || 23515c972dfSGustavo Pimentel interrupts > 32) 2365e8cb403SKishon Vijay Abraham I return -EINVAL; 2375e8cb403SKishon Vijay Abraham I 2385e8cb403SKishon Vijay Abraham I if (!epc->ops->set_msi) 2395e8cb403SKishon Vijay Abraham I return 0; 2405e8cb403SKishon Vijay Abraham I 2415e8cb403SKishon Vijay Abraham I encode_int = order_base_2(interrupts); 2425e8cb403SKishon Vijay Abraham I 2435e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 2444494738dSCyrille Pitchen ret = epc->ops->set_msi(epc, func_no, encode_int); 2455e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 2465e8cb403SKishon Vijay Abraham I 2475e8cb403SKishon Vijay Abraham I return ret; 2485e8cb403SKishon Vijay Abraham I } 2495e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_set_msi); 2505e8cb403SKishon Vijay Abraham I 2515e8cb403SKishon Vijay Abraham I /** 2528963106eSGustavo Pimentel * pci_epc_get_msix() - get the number of MSI-X interrupt numbers allocated 2538963106eSGustavo Pimentel * @epc: the EPC device to which MSI-X interrupts was requested 2548963106eSGustavo Pimentel * @func_no: the endpoint function number in the EPC device 2558963106eSGustavo Pimentel * 2568963106eSGustavo Pimentel * Invoke to get the number of MSI-X interrupts allocated by the RC 2578963106eSGustavo Pimentel */ 2588963106eSGustavo Pimentel int pci_epc_get_msix(struct pci_epc *epc, u8 func_no) 2598963106eSGustavo Pimentel { 2608963106eSGustavo Pimentel int interrupt; 2618963106eSGustavo Pimentel unsigned long flags; 2628963106eSGustavo Pimentel 2638963106eSGustavo Pimentel if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 2648963106eSGustavo Pimentel return 0; 2658963106eSGustavo Pimentel 2668963106eSGustavo Pimentel if (!epc->ops->get_msix) 2678963106eSGustavo Pimentel return 0; 2688963106eSGustavo Pimentel 2698963106eSGustavo Pimentel spin_lock_irqsave(&epc->lock, flags); 2708963106eSGustavo Pimentel interrupt = epc->ops->get_msix(epc, func_no); 2718963106eSGustavo Pimentel spin_unlock_irqrestore(&epc->lock, flags); 2728963106eSGustavo Pimentel 2738963106eSGustavo Pimentel if (interrupt < 0) 2748963106eSGustavo Pimentel return 0; 2758963106eSGustavo Pimentel 2768963106eSGustavo Pimentel return interrupt + 1; 2778963106eSGustavo Pimentel } 2788963106eSGustavo Pimentel EXPORT_SYMBOL_GPL(pci_epc_get_msix); 2798963106eSGustavo Pimentel 2808963106eSGustavo Pimentel /** 2818963106eSGustavo Pimentel * pci_epc_set_msix() - set the number of MSI-X interrupt numbers required 2828963106eSGustavo Pimentel * @epc: the EPC device on which MSI-X has to be configured 2838963106eSGustavo Pimentel * @func_no: the endpoint function number in the EPC device 2848963106eSGustavo Pimentel * @interrupts: number of MSI-X interrupts required by the EPF 2858963106eSGustavo Pimentel * 2868963106eSGustavo Pimentel * Invoke to set the required number of MSI-X interrupts. 2878963106eSGustavo Pimentel */ 2888963106eSGustavo Pimentel int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u16 interrupts) 2898963106eSGustavo Pimentel { 2908963106eSGustavo Pimentel int ret; 2918963106eSGustavo Pimentel unsigned long flags; 2928963106eSGustavo Pimentel 2938963106eSGustavo Pimentel if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions || 2948963106eSGustavo Pimentel interrupts < 1 || interrupts > 2048) 2958963106eSGustavo Pimentel return -EINVAL; 2968963106eSGustavo Pimentel 2978963106eSGustavo Pimentel if (!epc->ops->set_msix) 2988963106eSGustavo Pimentel return 0; 2998963106eSGustavo Pimentel 3008963106eSGustavo Pimentel spin_lock_irqsave(&epc->lock, flags); 3018963106eSGustavo Pimentel ret = epc->ops->set_msix(epc, func_no, interrupts - 1); 3028963106eSGustavo Pimentel spin_unlock_irqrestore(&epc->lock, flags); 3038963106eSGustavo Pimentel 3048963106eSGustavo Pimentel return ret; 3058963106eSGustavo Pimentel } 3068963106eSGustavo Pimentel EXPORT_SYMBOL_GPL(pci_epc_set_msix); 3078963106eSGustavo Pimentel 3088963106eSGustavo Pimentel /** 3095e8cb403SKishon Vijay Abraham I * pci_epc_unmap_addr() - unmap CPU address from PCI address 3105e8cb403SKishon Vijay Abraham I * @epc: the EPC device on which address is allocated 3114494738dSCyrille Pitchen * @func_no: the endpoint function number in the EPC device 3125e8cb403SKishon Vijay Abraham I * @phys_addr: physical address of the local system 3135e8cb403SKishon Vijay Abraham I * 3145e8cb403SKishon Vijay Abraham I * Invoke to unmap the CPU address from PCI address. 3155e8cb403SKishon Vijay Abraham I */ 3164494738dSCyrille Pitchen void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no, 3174494738dSCyrille Pitchen phys_addr_t phys_addr) 3185e8cb403SKishon Vijay Abraham I { 3195e8cb403SKishon Vijay Abraham I unsigned long flags; 3205e8cb403SKishon Vijay Abraham I 3214494738dSCyrille Pitchen if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 3225e8cb403SKishon Vijay Abraham I return; 3235e8cb403SKishon Vijay Abraham I 3245e8cb403SKishon Vijay Abraham I if (!epc->ops->unmap_addr) 3255e8cb403SKishon Vijay Abraham I return; 3265e8cb403SKishon Vijay Abraham I 3275e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 3284494738dSCyrille Pitchen epc->ops->unmap_addr(epc, func_no, phys_addr); 3295e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 3305e8cb403SKishon Vijay Abraham I } 3315e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_unmap_addr); 3325e8cb403SKishon Vijay Abraham I 3335e8cb403SKishon Vijay Abraham I /** 3345e8cb403SKishon Vijay Abraham I * pci_epc_map_addr() - map CPU address to PCI address 3355e8cb403SKishon Vijay Abraham I * @epc: the EPC device on which address is allocated 3364494738dSCyrille Pitchen * @func_no: the endpoint function number in the EPC device 3375e8cb403SKishon Vijay Abraham I * @phys_addr: physical address of the local system 3385e8cb403SKishon Vijay Abraham I * @pci_addr: PCI address to which the physical address should be mapped 3395e8cb403SKishon Vijay Abraham I * @size: the size of the allocation 3405e8cb403SKishon Vijay Abraham I * 3415e8cb403SKishon Vijay Abraham I * Invoke to map CPU address with PCI address. 3425e8cb403SKishon Vijay Abraham I */ 3434494738dSCyrille Pitchen int pci_epc_map_addr(struct pci_epc *epc, u8 func_no, 3444494738dSCyrille Pitchen phys_addr_t phys_addr, u64 pci_addr, size_t size) 3455e8cb403SKishon Vijay Abraham I { 3465e8cb403SKishon Vijay Abraham I int ret; 3475e8cb403SKishon Vijay Abraham I unsigned long flags; 3485e8cb403SKishon Vijay Abraham I 3494494738dSCyrille Pitchen if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 3505e8cb403SKishon Vijay Abraham I return -EINVAL; 3515e8cb403SKishon Vijay Abraham I 3525e8cb403SKishon Vijay Abraham I if (!epc->ops->map_addr) 3535e8cb403SKishon Vijay Abraham I return 0; 3545e8cb403SKishon Vijay Abraham I 3555e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 3564494738dSCyrille Pitchen ret = epc->ops->map_addr(epc, func_no, phys_addr, pci_addr, size); 3575e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 3585e8cb403SKishon Vijay Abraham I 3595e8cb403SKishon Vijay Abraham I return ret; 3605e8cb403SKishon Vijay Abraham I } 3615e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_map_addr); 3625e8cb403SKishon Vijay Abraham I 3635e8cb403SKishon Vijay Abraham I /** 3645e8cb403SKishon Vijay Abraham I * pci_epc_clear_bar() - reset the BAR 3655e8cb403SKishon Vijay Abraham I * @epc: the EPC device for which the BAR has to be cleared 3664494738dSCyrille Pitchen * @func_no: the endpoint function number in the EPC device 36777d08dbdSNiklas Cassel * @epf_bar: the struct epf_bar that contains the BAR information 3685e8cb403SKishon Vijay Abraham I * 3695e8cb403SKishon Vijay Abraham I * Invoke to reset the BAR of the endpoint device. 3705e8cb403SKishon Vijay Abraham I */ 37177d08dbdSNiklas Cassel void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no, 37277d08dbdSNiklas Cassel struct pci_epf_bar *epf_bar) 3735e8cb403SKishon Vijay Abraham I { 3745e8cb403SKishon Vijay Abraham I unsigned long flags; 3755e8cb403SKishon Vijay Abraham I 3766474a4e5SNiklas Cassel if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions || 3776474a4e5SNiklas Cassel (epf_bar->barno == BAR_5 && 3786474a4e5SNiklas Cassel epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64)) 3795e8cb403SKishon Vijay Abraham I return; 3805e8cb403SKishon Vijay Abraham I 3815e8cb403SKishon Vijay Abraham I if (!epc->ops->clear_bar) 3825e8cb403SKishon Vijay Abraham I return; 3835e8cb403SKishon Vijay Abraham I 3845e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 38577d08dbdSNiklas Cassel epc->ops->clear_bar(epc, func_no, epf_bar); 3865e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 3875e8cb403SKishon Vijay Abraham I } 3885e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_clear_bar); 3895e8cb403SKishon Vijay Abraham I 3905e8cb403SKishon Vijay Abraham I /** 3915e8cb403SKishon Vijay Abraham I * pci_epc_set_bar() - configure BAR in order for host to assign PCI addr space 3925e8cb403SKishon Vijay Abraham I * @epc: the EPC device on which BAR has to be configured 3934494738dSCyrille Pitchen * @func_no: the endpoint function number in the EPC device 394bc4a4897SNiklas Cassel * @epf_bar: the struct epf_bar that contains the BAR information 3955e8cb403SKishon Vijay Abraham I * 3965e8cb403SKishon Vijay Abraham I * Invoke to configure the BAR of the endpoint device. 3975e8cb403SKishon Vijay Abraham I */ 398bc4a4897SNiklas Cassel int pci_epc_set_bar(struct pci_epc *epc, u8 func_no, 399bc4a4897SNiklas Cassel struct pci_epf_bar *epf_bar) 4005e8cb403SKishon Vijay Abraham I { 4015e8cb403SKishon Vijay Abraham I int ret; 4025e8cb403SKishon Vijay Abraham I unsigned long irq_flags; 4033567a4edSNiklas Cassel int flags = epf_bar->flags; 4045e8cb403SKishon Vijay Abraham I 405f16b1f6fSNiklas Cassel if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions || 406f16b1f6fSNiklas Cassel (epf_bar->barno == BAR_5 && 4073567a4edSNiklas Cassel flags & PCI_BASE_ADDRESS_MEM_TYPE_64) || 4083567a4edSNiklas Cassel (flags & PCI_BASE_ADDRESS_SPACE_IO && 409f25b5faeSNiklas Cassel flags & PCI_BASE_ADDRESS_IO_MASK) || 410f25b5faeSNiklas Cassel (upper_32_bits(epf_bar->size) && 411f25b5faeSNiklas Cassel !(flags & PCI_BASE_ADDRESS_MEM_TYPE_64))) 4125e8cb403SKishon Vijay Abraham I return -EINVAL; 4135e8cb403SKishon Vijay Abraham I 4145e8cb403SKishon Vijay Abraham I if (!epc->ops->set_bar) 4155e8cb403SKishon Vijay Abraham I return 0; 4165e8cb403SKishon Vijay Abraham I 4175e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, irq_flags); 418bc4a4897SNiklas Cassel ret = epc->ops->set_bar(epc, func_no, epf_bar); 4195e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, irq_flags); 4205e8cb403SKishon Vijay Abraham I 4215e8cb403SKishon Vijay Abraham I return ret; 4225e8cb403SKishon Vijay Abraham I } 4235e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_set_bar); 4245e8cb403SKishon Vijay Abraham I 4255e8cb403SKishon Vijay Abraham I /** 4265e8cb403SKishon Vijay Abraham I * pci_epc_write_header() - write standard configuration header 4275e8cb403SKishon Vijay Abraham I * @epc: the EPC device to which the configuration header should be written 4284494738dSCyrille Pitchen * @func_no: the endpoint function number in the EPC device 4295e8cb403SKishon Vijay Abraham I * @header: standard configuration header fields 4305e8cb403SKishon Vijay Abraham I * 4315e8cb403SKishon Vijay Abraham I * Invoke to write the configuration header to the endpoint controller. Every 4325e8cb403SKishon Vijay Abraham I * endpoint controller will have a dedicated location to which the standard 4335e8cb403SKishon Vijay Abraham I * configuration header would be written. The callback function should write 4345e8cb403SKishon Vijay Abraham I * the header fields to this dedicated location. 4355e8cb403SKishon Vijay Abraham I */ 4364494738dSCyrille Pitchen int pci_epc_write_header(struct pci_epc *epc, u8 func_no, 4374494738dSCyrille Pitchen struct pci_epf_header *header) 4385e8cb403SKishon Vijay Abraham I { 4395e8cb403SKishon Vijay Abraham I int ret; 4405e8cb403SKishon Vijay Abraham I unsigned long flags; 4415e8cb403SKishon Vijay Abraham I 4424494738dSCyrille Pitchen if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 4435e8cb403SKishon Vijay Abraham I return -EINVAL; 4445e8cb403SKishon Vijay Abraham I 4455e8cb403SKishon Vijay Abraham I if (!epc->ops->write_header) 4465e8cb403SKishon Vijay Abraham I return 0; 4475e8cb403SKishon Vijay Abraham I 4485e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 4494494738dSCyrille Pitchen ret = epc->ops->write_header(epc, func_no, header); 4505e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 4515e8cb403SKishon Vijay Abraham I 4525e8cb403SKishon Vijay Abraham I return ret; 4535e8cb403SKishon Vijay Abraham I } 4545e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_write_header); 4555e8cb403SKishon Vijay Abraham I 4565e8cb403SKishon Vijay Abraham I /** 4575e8cb403SKishon Vijay Abraham I * pci_epc_add_epf() - bind PCI endpoint function to an endpoint controller 4585e8cb403SKishon Vijay Abraham I * @epc: the EPC device to which the endpoint function should be added 4595e8cb403SKishon Vijay Abraham I * @epf: the endpoint function to be added 4605e8cb403SKishon Vijay Abraham I * 4615e8cb403SKishon Vijay Abraham I * A PCI endpoint device can have one or more functions. In the case of PCIe, 4625e8cb403SKishon Vijay Abraham I * the specification allows up to 8 PCIe endpoint functions. Invoke 4635e8cb403SKishon Vijay Abraham I * pci_epc_add_epf() to add a PCI endpoint function to an endpoint controller. 4645e8cb403SKishon Vijay Abraham I */ 4655e8cb403SKishon Vijay Abraham I int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf) 4665e8cb403SKishon Vijay Abraham I { 4675e8cb403SKishon Vijay Abraham I unsigned long flags; 4685e8cb403SKishon Vijay Abraham I 4695e8cb403SKishon Vijay Abraham I if (epf->epc) 4705e8cb403SKishon Vijay Abraham I return -EBUSY; 4715e8cb403SKishon Vijay Abraham I 4725e8cb403SKishon Vijay Abraham I if (IS_ERR(epc)) 4735e8cb403SKishon Vijay Abraham I return -EINVAL; 4745e8cb403SKishon Vijay Abraham I 4755e8cb403SKishon Vijay Abraham I if (epf->func_no > epc->max_functions - 1) 4765e8cb403SKishon Vijay Abraham I return -EINVAL; 4775e8cb403SKishon Vijay Abraham I 4785e8cb403SKishon Vijay Abraham I epf->epc = epc; 4795e8cb403SKishon Vijay Abraham I 4805e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 4815e8cb403SKishon Vijay Abraham I list_add_tail(&epf->list, &epc->pci_epf); 4825e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 4835e8cb403SKishon Vijay Abraham I 4845e8cb403SKishon Vijay Abraham I return 0; 4855e8cb403SKishon Vijay Abraham I } 4865e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_add_epf); 4875e8cb403SKishon Vijay Abraham I 4885e8cb403SKishon Vijay Abraham I /** 4895e8cb403SKishon Vijay Abraham I * pci_epc_remove_epf() - remove PCI endpoint function from endpoint controller 4905e8cb403SKishon Vijay Abraham I * @epc: the EPC device from which the endpoint function should be removed 4915e8cb403SKishon Vijay Abraham I * @epf: the endpoint function to be removed 4925e8cb403SKishon Vijay Abraham I * 4935e8cb403SKishon Vijay Abraham I * Invoke to remove PCI endpoint function from the endpoint controller. 4945e8cb403SKishon Vijay Abraham I */ 4955e8cb403SKishon Vijay Abraham I void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf) 4965e8cb403SKishon Vijay Abraham I { 4975e8cb403SKishon Vijay Abraham I unsigned long flags; 4985e8cb403SKishon Vijay Abraham I 4995e8cb403SKishon Vijay Abraham I if (!epc || IS_ERR(epc)) 5005e8cb403SKishon Vijay Abraham I return; 5015e8cb403SKishon Vijay Abraham I 5025e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 5035e8cb403SKishon Vijay Abraham I list_del(&epf->list); 5045e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 5055e8cb403SKishon Vijay Abraham I } 5065e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_remove_epf); 5075e8cb403SKishon Vijay Abraham I 5085e8cb403SKishon Vijay Abraham I /** 5095e8cb403SKishon Vijay Abraham I * pci_epc_linkup() - Notify the EPF device that EPC device has established a 5105e8cb403SKishon Vijay Abraham I * connection with the Root Complex. 5115e8cb403SKishon Vijay Abraham I * @epc: the EPC device which has established link with the host 5125e8cb403SKishon Vijay Abraham I * 5135e8cb403SKishon Vijay Abraham I * Invoke to Notify the EPF device that the EPC device has established a 5145e8cb403SKishon Vijay Abraham I * connection with the Root Complex. 5155e8cb403SKishon Vijay Abraham I */ 5165e8cb403SKishon Vijay Abraham I void pci_epc_linkup(struct pci_epc *epc) 5175e8cb403SKishon Vijay Abraham I { 5185e8cb403SKishon Vijay Abraham I unsigned long flags; 5195e8cb403SKishon Vijay Abraham I struct pci_epf *epf; 5205e8cb403SKishon Vijay Abraham I 5215e8cb403SKishon Vijay Abraham I if (!epc || IS_ERR(epc)) 5225e8cb403SKishon Vijay Abraham I return; 5235e8cb403SKishon Vijay Abraham I 5245e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 5255e8cb403SKishon Vijay Abraham I list_for_each_entry(epf, &epc->pci_epf, list) 5265e8cb403SKishon Vijay Abraham I pci_epf_linkup(epf); 5275e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 5285e8cb403SKishon Vijay Abraham I } 5295e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_linkup); 5305e8cb403SKishon Vijay Abraham I 5315e8cb403SKishon Vijay Abraham I /** 5325e8cb403SKishon Vijay Abraham I * pci_epc_destroy() - destroy the EPC device 5335e8cb403SKishon Vijay Abraham I * @epc: the EPC device that has to be destroyed 5345e8cb403SKishon Vijay Abraham I * 5355e8cb403SKishon Vijay Abraham I * Invoke to destroy the PCI EPC device 5365e8cb403SKishon Vijay Abraham I */ 5375e8cb403SKishon Vijay Abraham I void pci_epc_destroy(struct pci_epc *epc) 5385e8cb403SKishon Vijay Abraham I { 5393a401a2cSKishon Vijay Abraham I pci_ep_cfs_remove_epc_group(epc->group); 5405e8cb403SKishon Vijay Abraham I device_unregister(&epc->dev); 5415e8cb403SKishon Vijay Abraham I kfree(epc); 5425e8cb403SKishon Vijay Abraham I } 5435e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_destroy); 5445e8cb403SKishon Vijay Abraham I 5455e8cb403SKishon Vijay Abraham I /** 5465e8cb403SKishon Vijay Abraham I * devm_pci_epc_destroy() - destroy the EPC device 5475e8cb403SKishon Vijay Abraham I * @dev: device that wants to destroy the EPC 5485e8cb403SKishon Vijay Abraham I * @epc: the EPC device that has to be destroyed 5495e8cb403SKishon Vijay Abraham I * 5505e8cb403SKishon Vijay Abraham I * Invoke to destroy the devres associated with this 5515e8cb403SKishon Vijay Abraham I * pci_epc and destroy the EPC device. 5525e8cb403SKishon Vijay Abraham I */ 5535e8cb403SKishon Vijay Abraham I void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc) 5545e8cb403SKishon Vijay Abraham I { 5555e8cb403SKishon Vijay Abraham I int r; 5565e8cb403SKishon Vijay Abraham I 5575e8cb403SKishon Vijay Abraham I r = devres_destroy(dev, devm_pci_epc_release, devm_pci_epc_match, 5585e8cb403SKishon Vijay Abraham I epc); 5595e8cb403SKishon Vijay Abraham I dev_WARN_ONCE(dev, r, "couldn't find PCI EPC resource\n"); 5605e8cb403SKishon Vijay Abraham I } 5615e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(devm_pci_epc_destroy); 5625e8cb403SKishon Vijay Abraham I 5635e8cb403SKishon Vijay Abraham I /** 5645e8cb403SKishon Vijay Abraham I * __pci_epc_create() - create a new endpoint controller (EPC) device 5655e8cb403SKishon Vijay Abraham I * @dev: device that is creating the new EPC 5665e8cb403SKishon Vijay Abraham I * @ops: function pointers for performing EPC operations 5675e8cb403SKishon Vijay Abraham I * @owner: the owner of the module that creates the EPC device 5685e8cb403SKishon Vijay Abraham I * 5695e8cb403SKishon Vijay Abraham I * Invoke to create a new EPC device and add it to pci_epc class. 5705e8cb403SKishon Vijay Abraham I */ 5715e8cb403SKishon Vijay Abraham I struct pci_epc * 5725e8cb403SKishon Vijay Abraham I __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops, 5735e8cb403SKishon Vijay Abraham I struct module *owner) 5745e8cb403SKishon Vijay Abraham I { 5755e8cb403SKishon Vijay Abraham I int ret; 5765e8cb403SKishon Vijay Abraham I struct pci_epc *epc; 5775e8cb403SKishon Vijay Abraham I 5785e8cb403SKishon Vijay Abraham I if (WARN_ON(!dev)) { 5795e8cb403SKishon Vijay Abraham I ret = -EINVAL; 5805e8cb403SKishon Vijay Abraham I goto err_ret; 5815e8cb403SKishon Vijay Abraham I } 5825e8cb403SKishon Vijay Abraham I 5835e8cb403SKishon Vijay Abraham I epc = kzalloc(sizeof(*epc), GFP_KERNEL); 5845e8cb403SKishon Vijay Abraham I if (!epc) { 5855e8cb403SKishon Vijay Abraham I ret = -ENOMEM; 5865e8cb403SKishon Vijay Abraham I goto err_ret; 5875e8cb403SKishon Vijay Abraham I } 5885e8cb403SKishon Vijay Abraham I 5895e8cb403SKishon Vijay Abraham I spin_lock_init(&epc->lock); 5905e8cb403SKishon Vijay Abraham I INIT_LIST_HEAD(&epc->pci_epf); 5915e8cb403SKishon Vijay Abraham I 5925e8cb403SKishon Vijay Abraham I device_initialize(&epc->dev); 5935e8cb403SKishon Vijay Abraham I epc->dev.class = pci_epc_class; 59464c1a02aSKishon Vijay Abraham I epc->dev.parent = dev; 5955e8cb403SKishon Vijay Abraham I epc->ops = ops; 5965e8cb403SKishon Vijay Abraham I 5975e8cb403SKishon Vijay Abraham I ret = dev_set_name(&epc->dev, "%s", dev_name(dev)); 5985e8cb403SKishon Vijay Abraham I if (ret) 5995e8cb403SKishon Vijay Abraham I goto put_dev; 6005e8cb403SKishon Vijay Abraham I 6015e8cb403SKishon Vijay Abraham I ret = device_add(&epc->dev); 6025e8cb403SKishon Vijay Abraham I if (ret) 6035e8cb403SKishon Vijay Abraham I goto put_dev; 6045e8cb403SKishon Vijay Abraham I 6053a401a2cSKishon Vijay Abraham I epc->group = pci_ep_cfs_add_epc_group(dev_name(dev)); 6063a401a2cSKishon Vijay Abraham I 6075e8cb403SKishon Vijay Abraham I return epc; 6085e8cb403SKishon Vijay Abraham I 6095e8cb403SKishon Vijay Abraham I put_dev: 6105e8cb403SKishon Vijay Abraham I put_device(&epc->dev); 6115e8cb403SKishon Vijay Abraham I kfree(epc); 6125e8cb403SKishon Vijay Abraham I 6135e8cb403SKishon Vijay Abraham I err_ret: 6145e8cb403SKishon Vijay Abraham I return ERR_PTR(ret); 6155e8cb403SKishon Vijay Abraham I } 6165e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(__pci_epc_create); 6175e8cb403SKishon Vijay Abraham I 6185e8cb403SKishon Vijay Abraham I /** 6195e8cb403SKishon Vijay Abraham I * __devm_pci_epc_create() - create a new endpoint controller (EPC) device 6205e8cb403SKishon Vijay Abraham I * @dev: device that is creating the new EPC 6215e8cb403SKishon Vijay Abraham I * @ops: function pointers for performing EPC operations 6225e8cb403SKishon Vijay Abraham I * @owner: the owner of the module that creates the EPC device 6235e8cb403SKishon Vijay Abraham I * 6245e8cb403SKishon Vijay Abraham I * Invoke to create a new EPC device and add it to pci_epc class. 6255e8cb403SKishon Vijay Abraham I * While at that, it also associates the device with the pci_epc using devres. 6265e8cb403SKishon Vijay Abraham I * On driver detach, release function is invoked on the devres data, 6275e8cb403SKishon Vijay Abraham I * then, devres data is freed. 6285e8cb403SKishon Vijay Abraham I */ 6295e8cb403SKishon Vijay Abraham I struct pci_epc * 6305e8cb403SKishon Vijay Abraham I __devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops, 6315e8cb403SKishon Vijay Abraham I struct module *owner) 6325e8cb403SKishon Vijay Abraham I { 6335e8cb403SKishon Vijay Abraham I struct pci_epc **ptr, *epc; 6345e8cb403SKishon Vijay Abraham I 6355e8cb403SKishon Vijay Abraham I ptr = devres_alloc(devm_pci_epc_release, sizeof(*ptr), GFP_KERNEL); 6365e8cb403SKishon Vijay Abraham I if (!ptr) 6375e8cb403SKishon Vijay Abraham I return ERR_PTR(-ENOMEM); 6385e8cb403SKishon Vijay Abraham I 6395e8cb403SKishon Vijay Abraham I epc = __pci_epc_create(dev, ops, owner); 6405e8cb403SKishon Vijay Abraham I if (!IS_ERR(epc)) { 6415e8cb403SKishon Vijay Abraham I *ptr = epc; 6425e8cb403SKishon Vijay Abraham I devres_add(dev, ptr); 6435e8cb403SKishon Vijay Abraham I } else { 6445e8cb403SKishon Vijay Abraham I devres_free(ptr); 6455e8cb403SKishon Vijay Abraham I } 6465e8cb403SKishon Vijay Abraham I 6475e8cb403SKishon Vijay Abraham I return epc; 6485e8cb403SKishon Vijay Abraham I } 6495e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(__devm_pci_epc_create); 6505e8cb403SKishon Vijay Abraham I 6515e8cb403SKishon Vijay Abraham I static int __init pci_epc_init(void) 6525e8cb403SKishon Vijay Abraham I { 6535e8cb403SKishon Vijay Abraham I pci_epc_class = class_create(THIS_MODULE, "pci_epc"); 6545e8cb403SKishon Vijay Abraham I if (IS_ERR(pci_epc_class)) { 6555e8cb403SKishon Vijay Abraham I pr_err("failed to create pci epc class --> %ld\n", 6565e8cb403SKishon Vijay Abraham I PTR_ERR(pci_epc_class)); 6575e8cb403SKishon Vijay Abraham I return PTR_ERR(pci_epc_class); 6585e8cb403SKishon Vijay Abraham I } 6595e8cb403SKishon Vijay Abraham I 6605e8cb403SKishon Vijay Abraham I return 0; 6615e8cb403SKishon Vijay Abraham I } 6625e8cb403SKishon Vijay Abraham I module_init(pci_epc_init); 6635e8cb403SKishon Vijay Abraham I 6645e8cb403SKishon Vijay Abraham I static void __exit pci_epc_exit(void) 6655e8cb403SKishon Vijay Abraham I { 6665e8cb403SKishon Vijay Abraham I class_destroy(pci_epc_class); 6675e8cb403SKishon Vijay Abraham I } 6685e8cb403SKishon Vijay Abraham I module_exit(pci_epc_exit); 6695e8cb403SKishon Vijay Abraham I 6705e8cb403SKishon Vijay Abraham I MODULE_DESCRIPTION("PCI EPC Library"); 6715e8cb403SKishon Vijay Abraham I MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>"); 6725e8cb403SKishon Vijay Abraham I MODULE_LICENSE("GPL v2"); 673