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 /** 871e9efe6cSKishon Vijay Abraham I * pci_epc_get_first_free_bar() - helper to get first unreserved BAR 881e9efe6cSKishon Vijay Abraham I * @epc_features: pci_epc_features structure that holds the reserved bar bitmap 891e9efe6cSKishon Vijay Abraham I * 901e9efe6cSKishon Vijay Abraham I * Invoke to get the first unreserved BAR that can be used for endpoint 911e9efe6cSKishon Vijay Abraham I * function. For any incorrect value in reserved_bar return '0'. 921e9efe6cSKishon Vijay Abraham I */ 931e9efe6cSKishon Vijay Abraham I unsigned int pci_epc_get_first_free_bar(const struct pci_epc_features 941e9efe6cSKishon Vijay Abraham I *epc_features) 951e9efe6cSKishon Vijay Abraham I { 961e9efe6cSKishon Vijay Abraham I int free_bar; 971e9efe6cSKishon Vijay Abraham I 981e9efe6cSKishon Vijay Abraham I if (!epc_features) 991e9efe6cSKishon Vijay Abraham I return 0; 1001e9efe6cSKishon Vijay Abraham I 1011e9efe6cSKishon Vijay Abraham I free_bar = ffz(epc_features->reserved_bar); 1021e9efe6cSKishon Vijay Abraham I if (free_bar > 5) 1031e9efe6cSKishon Vijay Abraham I return 0; 1041e9efe6cSKishon Vijay Abraham I 1051e9efe6cSKishon Vijay Abraham I return free_bar; 1061e9efe6cSKishon Vijay Abraham I } 1071e9efe6cSKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_get_first_free_bar); 1081e9efe6cSKishon Vijay Abraham I 1091e9efe6cSKishon Vijay Abraham I /** 11041cb8d18SKishon Vijay Abraham I * pci_epc_get_features() - get the features supported by EPC 11141cb8d18SKishon Vijay Abraham I * @epc: the features supported by *this* EPC device will be returned 11241cb8d18SKishon Vijay Abraham I * @func_no: the features supported by the EPC device specific to the 11341cb8d18SKishon Vijay Abraham I * endpoint function with func_no will be returned 11441cb8d18SKishon Vijay Abraham I * 11541cb8d18SKishon Vijay Abraham I * Invoke to get the features provided by the EPC which may be 11641cb8d18SKishon Vijay Abraham I * specific to an endpoint function. Returns pci_epc_features on success 11741cb8d18SKishon Vijay Abraham I * and NULL for any failures. 11841cb8d18SKishon Vijay Abraham I */ 11941cb8d18SKishon Vijay Abraham I const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc, 12041cb8d18SKishon Vijay Abraham I u8 func_no) 12141cb8d18SKishon Vijay Abraham I { 12241cb8d18SKishon Vijay Abraham I const struct pci_epc_features *epc_features; 12341cb8d18SKishon Vijay Abraham I 12441cb8d18SKishon Vijay Abraham I if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 12541cb8d18SKishon Vijay Abraham I return NULL; 12641cb8d18SKishon Vijay Abraham I 12741cb8d18SKishon Vijay Abraham I if (!epc->ops->get_features) 12841cb8d18SKishon Vijay Abraham I return NULL; 12941cb8d18SKishon Vijay Abraham I 1303d3248dbSKishon Vijay Abraham I mutex_lock(&epc->lock); 13141cb8d18SKishon Vijay Abraham I epc_features = epc->ops->get_features(epc, func_no); 1323d3248dbSKishon Vijay Abraham I mutex_unlock(&epc->lock); 13341cb8d18SKishon Vijay Abraham I 13441cb8d18SKishon Vijay Abraham I return epc_features; 13541cb8d18SKishon Vijay Abraham I } 13641cb8d18SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_get_features); 13741cb8d18SKishon Vijay Abraham I 13841cb8d18SKishon Vijay Abraham I /** 1395e8cb403SKishon Vijay Abraham I * pci_epc_stop() - stop the PCI link 1405e8cb403SKishon Vijay Abraham I * @epc: the link of the EPC device that has to be stopped 1415e8cb403SKishon Vijay Abraham I * 1425e8cb403SKishon Vijay Abraham I * Invoke to stop the PCI link 1435e8cb403SKishon Vijay Abraham I */ 1445e8cb403SKishon Vijay Abraham I void pci_epc_stop(struct pci_epc *epc) 1455e8cb403SKishon Vijay Abraham I { 1465e8cb403SKishon Vijay Abraham I if (IS_ERR(epc) || !epc->ops->stop) 1475e8cb403SKishon Vijay Abraham I return; 1485e8cb403SKishon Vijay Abraham I 1493d3248dbSKishon Vijay Abraham I mutex_lock(&epc->lock); 1505e8cb403SKishon Vijay Abraham I epc->ops->stop(epc); 1513d3248dbSKishon Vijay Abraham I mutex_unlock(&epc->lock); 1525e8cb403SKishon Vijay Abraham I } 1535e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_stop); 1545e8cb403SKishon Vijay Abraham I 1555e8cb403SKishon Vijay Abraham I /** 1565e8cb403SKishon Vijay Abraham I * pci_epc_start() - start the PCI link 1575e8cb403SKishon Vijay Abraham I * @epc: the link of *this* EPC device has to be started 1585e8cb403SKishon Vijay Abraham I * 1595e8cb403SKishon Vijay Abraham I * Invoke to start the PCI link 1605e8cb403SKishon Vijay Abraham I */ 1615e8cb403SKishon Vijay Abraham I int pci_epc_start(struct pci_epc *epc) 1625e8cb403SKishon Vijay Abraham I { 1635e8cb403SKishon Vijay Abraham I int ret; 1645e8cb403SKishon Vijay Abraham I 1655e8cb403SKishon Vijay Abraham I if (IS_ERR(epc)) 1665e8cb403SKishon Vijay Abraham I return -EINVAL; 1675e8cb403SKishon Vijay Abraham I 1685e8cb403SKishon Vijay Abraham I if (!epc->ops->start) 1695e8cb403SKishon Vijay Abraham I return 0; 1705e8cb403SKishon Vijay Abraham I 1713d3248dbSKishon Vijay Abraham I mutex_lock(&epc->lock); 1725e8cb403SKishon Vijay Abraham I ret = epc->ops->start(epc); 1733d3248dbSKishon Vijay Abraham I mutex_unlock(&epc->lock); 1745e8cb403SKishon Vijay Abraham I 1755e8cb403SKishon Vijay Abraham I return ret; 1765e8cb403SKishon Vijay Abraham I } 1775e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_start); 1785e8cb403SKishon Vijay Abraham I 1795e8cb403SKishon Vijay Abraham I /** 1805e8cb403SKishon Vijay Abraham I * pci_epc_raise_irq() - interrupt the host system 1815e8cb403SKishon Vijay Abraham I * @epc: the EPC device which has to interrupt the host 1824494738dSCyrille Pitchen * @func_no: the endpoint function number in the EPC device 183d3c70a98SGustavo Pimentel * @type: specify the type of interrupt; legacy, MSI or MSI-X 184d3c70a98SGustavo Pimentel * @interrupt_num: the MSI or MSI-X interrupt number 1855e8cb403SKishon Vijay Abraham I * 186d3c70a98SGustavo Pimentel * Invoke to raise an legacy, MSI or MSI-X interrupt 1875e8cb403SKishon Vijay Abraham I */ 1884494738dSCyrille Pitchen int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no, 189d3c70a98SGustavo Pimentel enum pci_epc_irq_type type, u16 interrupt_num) 1905e8cb403SKishon Vijay Abraham I { 1915e8cb403SKishon Vijay Abraham I int ret; 1925e8cb403SKishon Vijay Abraham I 1934494738dSCyrille Pitchen if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 1945e8cb403SKishon Vijay Abraham I return -EINVAL; 1955e8cb403SKishon Vijay Abraham I 1965e8cb403SKishon Vijay Abraham I if (!epc->ops->raise_irq) 1975e8cb403SKishon Vijay Abraham I return 0; 1985e8cb403SKishon Vijay Abraham I 1993d3248dbSKishon Vijay Abraham I mutex_lock(&epc->lock); 2004494738dSCyrille Pitchen ret = epc->ops->raise_irq(epc, func_no, type, interrupt_num); 2013d3248dbSKishon Vijay Abraham I mutex_unlock(&epc->lock); 2025e8cb403SKishon Vijay Abraham I 2035e8cb403SKishon Vijay Abraham I return ret; 2045e8cb403SKishon Vijay Abraham I } 2055e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_raise_irq); 2065e8cb403SKishon Vijay Abraham I 2075e8cb403SKishon Vijay Abraham I /** 2085e8cb403SKishon Vijay Abraham I * pci_epc_get_msi() - get the number of MSI interrupt numbers allocated 2095e8cb403SKishon Vijay Abraham I * @epc: the EPC device to which MSI interrupts was requested 2104494738dSCyrille Pitchen * @func_no: the endpoint function number in the EPC device 2115e8cb403SKishon Vijay Abraham I * 2125e8cb403SKishon Vijay Abraham I * Invoke to get the number of MSI interrupts allocated by the RC 2135e8cb403SKishon Vijay Abraham I */ 2144494738dSCyrille Pitchen int pci_epc_get_msi(struct pci_epc *epc, u8 func_no) 2155e8cb403SKishon Vijay Abraham I { 2165e8cb403SKishon Vijay Abraham I int interrupt; 2175e8cb403SKishon Vijay Abraham I 2184494738dSCyrille Pitchen if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 2195e8cb403SKishon Vijay Abraham I return 0; 2205e8cb403SKishon Vijay Abraham I 2215e8cb403SKishon Vijay Abraham I if (!epc->ops->get_msi) 2225e8cb403SKishon Vijay Abraham I return 0; 2235e8cb403SKishon Vijay Abraham I 2243d3248dbSKishon Vijay Abraham I mutex_lock(&epc->lock); 2254494738dSCyrille Pitchen interrupt = epc->ops->get_msi(epc, func_no); 2263d3248dbSKishon Vijay Abraham I mutex_unlock(&epc->lock); 2275e8cb403SKishon Vijay Abraham I 2285e8cb403SKishon Vijay Abraham I if (interrupt < 0) 2295e8cb403SKishon Vijay Abraham I return 0; 2305e8cb403SKishon Vijay Abraham I 2315e8cb403SKishon Vijay Abraham I interrupt = 1 << interrupt; 2325e8cb403SKishon Vijay Abraham I 2335e8cb403SKishon Vijay Abraham I return interrupt; 2345e8cb403SKishon Vijay Abraham I } 2355e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_get_msi); 2365e8cb403SKishon Vijay Abraham I 2375e8cb403SKishon Vijay Abraham I /** 2385e8cb403SKishon Vijay Abraham I * pci_epc_set_msi() - set the number of MSI interrupt numbers required 2395e8cb403SKishon Vijay Abraham I * @epc: the EPC device on which MSI has to be configured 2404494738dSCyrille Pitchen * @func_no: the endpoint function number in the EPC device 2415e8cb403SKishon Vijay Abraham I * @interrupts: number of MSI interrupts required by the EPF 2425e8cb403SKishon Vijay Abraham I * 2435e8cb403SKishon Vijay Abraham I * Invoke to set the required number of MSI interrupts. 2445e8cb403SKishon Vijay Abraham I */ 2454494738dSCyrille Pitchen int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts) 2465e8cb403SKishon Vijay Abraham I { 2475e8cb403SKishon Vijay Abraham I int ret; 2485e8cb403SKishon Vijay Abraham I u8 encode_int; 2495e8cb403SKishon Vijay Abraham I 25015c972dfSGustavo Pimentel if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions || 25115c972dfSGustavo Pimentel interrupts > 32) 2525e8cb403SKishon Vijay Abraham I return -EINVAL; 2535e8cb403SKishon Vijay Abraham I 2545e8cb403SKishon Vijay Abraham I if (!epc->ops->set_msi) 2555e8cb403SKishon Vijay Abraham I return 0; 2565e8cb403SKishon Vijay Abraham I 2575e8cb403SKishon Vijay Abraham I encode_int = order_base_2(interrupts); 2585e8cb403SKishon Vijay Abraham I 2593d3248dbSKishon Vijay Abraham I mutex_lock(&epc->lock); 2604494738dSCyrille Pitchen ret = epc->ops->set_msi(epc, func_no, encode_int); 2613d3248dbSKishon Vijay Abraham I mutex_unlock(&epc->lock); 2625e8cb403SKishon Vijay Abraham I 2635e8cb403SKishon Vijay Abraham I return ret; 2645e8cb403SKishon Vijay Abraham I } 2655e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_set_msi); 2665e8cb403SKishon Vijay Abraham I 2675e8cb403SKishon Vijay Abraham I /** 2688963106eSGustavo Pimentel * pci_epc_get_msix() - get the number of MSI-X interrupt numbers allocated 2698963106eSGustavo Pimentel * @epc: the EPC device to which MSI-X interrupts was requested 2708963106eSGustavo Pimentel * @func_no: the endpoint function number in the EPC device 2718963106eSGustavo Pimentel * 2728963106eSGustavo Pimentel * Invoke to get the number of MSI-X interrupts allocated by the RC 2738963106eSGustavo Pimentel */ 2748963106eSGustavo Pimentel int pci_epc_get_msix(struct pci_epc *epc, u8 func_no) 2758963106eSGustavo Pimentel { 2768963106eSGustavo Pimentel int interrupt; 2778963106eSGustavo Pimentel 2788963106eSGustavo Pimentel if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 2798963106eSGustavo Pimentel return 0; 2808963106eSGustavo Pimentel 2818963106eSGustavo Pimentel if (!epc->ops->get_msix) 2828963106eSGustavo Pimentel return 0; 2838963106eSGustavo Pimentel 2843d3248dbSKishon Vijay Abraham I mutex_lock(&epc->lock); 2858963106eSGustavo Pimentel interrupt = epc->ops->get_msix(epc, func_no); 2863d3248dbSKishon Vijay Abraham I mutex_unlock(&epc->lock); 2878963106eSGustavo Pimentel 2888963106eSGustavo Pimentel if (interrupt < 0) 2898963106eSGustavo Pimentel return 0; 2908963106eSGustavo Pimentel 2918963106eSGustavo Pimentel return interrupt + 1; 2928963106eSGustavo Pimentel } 2938963106eSGustavo Pimentel EXPORT_SYMBOL_GPL(pci_epc_get_msix); 2948963106eSGustavo Pimentel 2958963106eSGustavo Pimentel /** 2968963106eSGustavo Pimentel * pci_epc_set_msix() - set the number of MSI-X interrupt numbers required 2978963106eSGustavo Pimentel * @epc: the EPC device on which MSI-X has to be configured 2988963106eSGustavo Pimentel * @func_no: the endpoint function number in the EPC device 2998963106eSGustavo Pimentel * @interrupts: number of MSI-X interrupts required by the EPF 30083153d9fSKishon Vijay Abraham I * @bir: BAR where the MSI-X table resides 30183153d9fSKishon Vijay Abraham I * @offset: Offset pointing to the start of MSI-X table 3028963106eSGustavo Pimentel * 3038963106eSGustavo Pimentel * Invoke to set the required number of MSI-X interrupts. 3048963106eSGustavo Pimentel */ 30583153d9fSKishon Vijay Abraham I int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u16 interrupts, 30683153d9fSKishon Vijay Abraham I enum pci_barno bir, u32 offset) 3078963106eSGustavo Pimentel { 3088963106eSGustavo Pimentel int ret; 3098963106eSGustavo Pimentel 3108963106eSGustavo Pimentel if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions || 3118963106eSGustavo Pimentel interrupts < 1 || interrupts > 2048) 3128963106eSGustavo Pimentel return -EINVAL; 3138963106eSGustavo Pimentel 3148963106eSGustavo Pimentel if (!epc->ops->set_msix) 3158963106eSGustavo Pimentel return 0; 3168963106eSGustavo Pimentel 3173d3248dbSKishon Vijay Abraham I mutex_lock(&epc->lock); 31883153d9fSKishon Vijay Abraham I ret = epc->ops->set_msix(epc, func_no, interrupts - 1, bir, offset); 3193d3248dbSKishon Vijay Abraham I mutex_unlock(&epc->lock); 3208963106eSGustavo Pimentel 3218963106eSGustavo Pimentel return ret; 3228963106eSGustavo Pimentel } 3238963106eSGustavo Pimentel EXPORT_SYMBOL_GPL(pci_epc_set_msix); 3248963106eSGustavo Pimentel 3258963106eSGustavo Pimentel /** 3265e8cb403SKishon Vijay Abraham I * pci_epc_unmap_addr() - unmap CPU address from PCI address 3275e8cb403SKishon Vijay Abraham I * @epc: the EPC device on which address is allocated 3284494738dSCyrille Pitchen * @func_no: the endpoint function number in the EPC device 3295e8cb403SKishon Vijay Abraham I * @phys_addr: physical address of the local system 3305e8cb403SKishon Vijay Abraham I * 3315e8cb403SKishon Vijay Abraham I * Invoke to unmap the CPU address from PCI address. 3325e8cb403SKishon Vijay Abraham I */ 3334494738dSCyrille Pitchen void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no, 3344494738dSCyrille Pitchen phys_addr_t phys_addr) 3355e8cb403SKishon Vijay Abraham I { 3364494738dSCyrille Pitchen if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 3375e8cb403SKishon Vijay Abraham I return; 3385e8cb403SKishon Vijay Abraham I 3395e8cb403SKishon Vijay Abraham I if (!epc->ops->unmap_addr) 3405e8cb403SKishon Vijay Abraham I return; 3415e8cb403SKishon Vijay Abraham I 3423d3248dbSKishon Vijay Abraham I mutex_lock(&epc->lock); 3434494738dSCyrille Pitchen epc->ops->unmap_addr(epc, func_no, phys_addr); 3443d3248dbSKishon Vijay Abraham I mutex_unlock(&epc->lock); 3455e8cb403SKishon Vijay Abraham I } 3465e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_unmap_addr); 3475e8cb403SKishon Vijay Abraham I 3485e8cb403SKishon Vijay Abraham I /** 3495e8cb403SKishon Vijay Abraham I * pci_epc_map_addr() - map CPU address to PCI address 3505e8cb403SKishon Vijay Abraham I * @epc: the EPC device on which address is allocated 3514494738dSCyrille Pitchen * @func_no: the endpoint function number in the EPC device 3525e8cb403SKishon Vijay Abraham I * @phys_addr: physical address of the local system 3535e8cb403SKishon Vijay Abraham I * @pci_addr: PCI address to which the physical address should be mapped 3545e8cb403SKishon Vijay Abraham I * @size: the size of the allocation 3555e8cb403SKishon Vijay Abraham I * 3565e8cb403SKishon Vijay Abraham I * Invoke to map CPU address with PCI address. 3575e8cb403SKishon Vijay Abraham I */ 3584494738dSCyrille Pitchen int pci_epc_map_addr(struct pci_epc *epc, u8 func_no, 3594494738dSCyrille Pitchen phys_addr_t phys_addr, u64 pci_addr, size_t size) 3605e8cb403SKishon Vijay Abraham I { 3615e8cb403SKishon Vijay Abraham I int ret; 3625e8cb403SKishon Vijay Abraham I 3634494738dSCyrille Pitchen if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 3645e8cb403SKishon Vijay Abraham I return -EINVAL; 3655e8cb403SKishon Vijay Abraham I 3665e8cb403SKishon Vijay Abraham I if (!epc->ops->map_addr) 3675e8cb403SKishon Vijay Abraham I return 0; 3685e8cb403SKishon Vijay Abraham I 3693d3248dbSKishon Vijay Abraham I mutex_lock(&epc->lock); 3704494738dSCyrille Pitchen ret = epc->ops->map_addr(epc, func_no, phys_addr, pci_addr, size); 3713d3248dbSKishon Vijay Abraham I mutex_unlock(&epc->lock); 3725e8cb403SKishon Vijay Abraham I 3735e8cb403SKishon Vijay Abraham I return ret; 3745e8cb403SKishon Vijay Abraham I } 3755e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_map_addr); 3765e8cb403SKishon Vijay Abraham I 3775e8cb403SKishon Vijay Abraham I /** 3785e8cb403SKishon Vijay Abraham I * pci_epc_clear_bar() - reset the BAR 3795e8cb403SKishon Vijay Abraham I * @epc: the EPC device for which the BAR has to be cleared 3804494738dSCyrille Pitchen * @func_no: the endpoint function number in the EPC device 38177d08dbdSNiklas Cassel * @epf_bar: the struct epf_bar that contains the BAR information 3825e8cb403SKishon Vijay Abraham I * 3835e8cb403SKishon Vijay Abraham I * Invoke to reset the BAR of the endpoint device. 3845e8cb403SKishon Vijay Abraham I */ 38577d08dbdSNiklas Cassel void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no, 38677d08dbdSNiklas Cassel struct pci_epf_bar *epf_bar) 3875e8cb403SKishon Vijay Abraham I { 3886474a4e5SNiklas Cassel if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions || 3896474a4e5SNiklas Cassel (epf_bar->barno == BAR_5 && 3906474a4e5SNiklas Cassel epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64)) 3915e8cb403SKishon Vijay Abraham I return; 3925e8cb403SKishon Vijay Abraham I 3935e8cb403SKishon Vijay Abraham I if (!epc->ops->clear_bar) 3945e8cb403SKishon Vijay Abraham I return; 3955e8cb403SKishon Vijay Abraham I 3963d3248dbSKishon Vijay Abraham I mutex_lock(&epc->lock); 39777d08dbdSNiklas Cassel epc->ops->clear_bar(epc, func_no, epf_bar); 3983d3248dbSKishon Vijay Abraham I mutex_unlock(&epc->lock); 3995e8cb403SKishon Vijay Abraham I } 4005e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_clear_bar); 4015e8cb403SKishon Vijay Abraham I 4025e8cb403SKishon Vijay Abraham I /** 4035e8cb403SKishon Vijay Abraham I * pci_epc_set_bar() - configure BAR in order for host to assign PCI addr space 4045e8cb403SKishon Vijay Abraham I * @epc: the EPC device on which BAR has to be configured 4054494738dSCyrille Pitchen * @func_no: the endpoint function number in the EPC device 406bc4a4897SNiklas Cassel * @epf_bar: the struct epf_bar that contains the BAR information 4075e8cb403SKishon Vijay Abraham I * 4085e8cb403SKishon Vijay Abraham I * Invoke to configure the BAR of the endpoint device. 4095e8cb403SKishon Vijay Abraham I */ 410bc4a4897SNiklas Cassel int pci_epc_set_bar(struct pci_epc *epc, u8 func_no, 411bc4a4897SNiklas Cassel struct pci_epf_bar *epf_bar) 4125e8cb403SKishon Vijay Abraham I { 4135e8cb403SKishon Vijay Abraham I int ret; 4143567a4edSNiklas Cassel int flags = epf_bar->flags; 4155e8cb403SKishon Vijay Abraham I 416f16b1f6fSNiklas Cassel if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions || 417f16b1f6fSNiklas Cassel (epf_bar->barno == BAR_5 && 4183567a4edSNiklas Cassel flags & PCI_BASE_ADDRESS_MEM_TYPE_64) || 4193567a4edSNiklas Cassel (flags & PCI_BASE_ADDRESS_SPACE_IO && 420f25b5faeSNiklas Cassel flags & PCI_BASE_ADDRESS_IO_MASK) || 421f25b5faeSNiklas Cassel (upper_32_bits(epf_bar->size) && 422f25b5faeSNiklas Cassel !(flags & PCI_BASE_ADDRESS_MEM_TYPE_64))) 4235e8cb403SKishon Vijay Abraham I return -EINVAL; 4245e8cb403SKishon Vijay Abraham I 4255e8cb403SKishon Vijay Abraham I if (!epc->ops->set_bar) 4265e8cb403SKishon Vijay Abraham I return 0; 4275e8cb403SKishon Vijay Abraham I 4283d3248dbSKishon Vijay Abraham I mutex_lock(&epc->lock); 429bc4a4897SNiklas Cassel ret = epc->ops->set_bar(epc, func_no, epf_bar); 4303d3248dbSKishon Vijay Abraham I mutex_unlock(&epc->lock); 4315e8cb403SKishon Vijay Abraham I 4325e8cb403SKishon Vijay Abraham I return ret; 4335e8cb403SKishon Vijay Abraham I } 4345e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_set_bar); 4355e8cb403SKishon Vijay Abraham I 4365e8cb403SKishon Vijay Abraham I /** 4375e8cb403SKishon Vijay Abraham I * pci_epc_write_header() - write standard configuration header 4385e8cb403SKishon Vijay Abraham I * @epc: the EPC device to which the configuration header should be written 4394494738dSCyrille Pitchen * @func_no: the endpoint function number in the EPC device 4405e8cb403SKishon Vijay Abraham I * @header: standard configuration header fields 4415e8cb403SKishon Vijay Abraham I * 4425e8cb403SKishon Vijay Abraham I * Invoke to write the configuration header to the endpoint controller. Every 4435e8cb403SKishon Vijay Abraham I * endpoint controller will have a dedicated location to which the standard 4445e8cb403SKishon Vijay Abraham I * configuration header would be written. The callback function should write 4455e8cb403SKishon Vijay Abraham I * the header fields to this dedicated location. 4465e8cb403SKishon Vijay Abraham I */ 4474494738dSCyrille Pitchen int pci_epc_write_header(struct pci_epc *epc, u8 func_no, 4484494738dSCyrille Pitchen struct pci_epf_header *header) 4495e8cb403SKishon Vijay Abraham I { 4505e8cb403SKishon Vijay Abraham I int ret; 4515e8cb403SKishon Vijay Abraham I 4524494738dSCyrille Pitchen if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions) 4535e8cb403SKishon Vijay Abraham I return -EINVAL; 4545e8cb403SKishon Vijay Abraham I 4555e8cb403SKishon Vijay Abraham I if (!epc->ops->write_header) 4565e8cb403SKishon Vijay Abraham I return 0; 4575e8cb403SKishon Vijay Abraham I 4583d3248dbSKishon Vijay Abraham I mutex_lock(&epc->lock); 4594494738dSCyrille Pitchen ret = epc->ops->write_header(epc, func_no, header); 4603d3248dbSKishon Vijay Abraham I mutex_unlock(&epc->lock); 4615e8cb403SKishon Vijay Abraham I 4625e8cb403SKishon Vijay Abraham I return ret; 4635e8cb403SKishon Vijay Abraham I } 4645e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_write_header); 4655e8cb403SKishon Vijay Abraham I 4665e8cb403SKishon Vijay Abraham I /** 4675e8cb403SKishon Vijay Abraham I * pci_epc_add_epf() - bind PCI endpoint function to an endpoint controller 4685e8cb403SKishon Vijay Abraham I * @epc: the EPC device to which the endpoint function should be added 4695e8cb403SKishon Vijay Abraham I * @epf: the endpoint function to be added 4705e8cb403SKishon Vijay Abraham I * 4715e8cb403SKishon Vijay Abraham I * A PCI endpoint device can have one or more functions. In the case of PCIe, 4725e8cb403SKishon Vijay Abraham I * the specification allows up to 8 PCIe endpoint functions. Invoke 4735e8cb403SKishon Vijay Abraham I * pci_epc_add_epf() to add a PCI endpoint function to an endpoint controller. 4745e8cb403SKishon Vijay Abraham I */ 4755e8cb403SKishon Vijay Abraham I int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf) 4765e8cb403SKishon Vijay Abraham I { 4772499ee84SKishon Vijay Abraham I u32 func_no; 4782499ee84SKishon Vijay Abraham I int ret = 0; 4792499ee84SKishon Vijay Abraham I 4805e8cb403SKishon Vijay Abraham I if (epf->epc) 4815e8cb403SKishon Vijay Abraham I return -EBUSY; 4825e8cb403SKishon Vijay Abraham I 4835e8cb403SKishon Vijay Abraham I if (IS_ERR(epc)) 4845e8cb403SKishon Vijay Abraham I return -EINVAL; 4855e8cb403SKishon Vijay Abraham I 4862499ee84SKishon Vijay Abraham I mutex_lock(&epc->lock); 4872499ee84SKishon Vijay Abraham I func_no = find_first_zero_bit(&epc->function_num_map, 4882499ee84SKishon Vijay Abraham I BITS_PER_LONG); 4892499ee84SKishon Vijay Abraham I if (func_no >= BITS_PER_LONG) { 4902499ee84SKishon Vijay Abraham I ret = -EINVAL; 4912499ee84SKishon Vijay Abraham I goto ret; 4922499ee84SKishon Vijay Abraham I } 4935e8cb403SKishon Vijay Abraham I 4942499ee84SKishon Vijay Abraham I if (func_no > epc->max_functions - 1) { 4952499ee84SKishon Vijay Abraham I dev_err(&epc->dev, "Exceeding max supported Function Number\n"); 4962499ee84SKishon Vijay Abraham I ret = -EINVAL; 4972499ee84SKishon Vijay Abraham I goto ret; 4982499ee84SKishon Vijay Abraham I } 4992499ee84SKishon Vijay Abraham I 5002499ee84SKishon Vijay Abraham I set_bit(func_no, &epc->function_num_map); 5012499ee84SKishon Vijay Abraham I epf->func_no = func_no; 5025e8cb403SKishon Vijay Abraham I epf->epc = epc; 5035e8cb403SKishon Vijay Abraham I 5045e8cb403SKishon Vijay Abraham I list_add_tail(&epf->list, &epc->pci_epf); 5052499ee84SKishon Vijay Abraham I 5062499ee84SKishon Vijay Abraham I ret: 5073d3248dbSKishon Vijay Abraham I mutex_unlock(&epc->lock); 5085e8cb403SKishon Vijay Abraham I 5092499ee84SKishon Vijay Abraham I return ret; 5105e8cb403SKishon Vijay Abraham I } 5115e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_add_epf); 5125e8cb403SKishon Vijay Abraham I 5135e8cb403SKishon Vijay Abraham I /** 5145e8cb403SKishon Vijay Abraham I * pci_epc_remove_epf() - remove PCI endpoint function from endpoint controller 5155e8cb403SKishon Vijay Abraham I * @epc: the EPC device from which the endpoint function should be removed 5165e8cb403SKishon Vijay Abraham I * @epf: the endpoint function to be removed 5175e8cb403SKishon Vijay Abraham I * 5185e8cb403SKishon Vijay Abraham I * Invoke to remove PCI endpoint function from the endpoint controller. 5195e8cb403SKishon Vijay Abraham I */ 5205e8cb403SKishon Vijay Abraham I void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf) 5215e8cb403SKishon Vijay Abraham I { 522db7a6248SAlan Mikhak if (!epc || IS_ERR(epc) || !epf) 5235e8cb403SKishon Vijay Abraham I return; 5245e8cb403SKishon Vijay Abraham I 5253d3248dbSKishon Vijay Abraham I mutex_lock(&epc->lock); 5262499ee84SKishon Vijay Abraham I clear_bit(epf->func_no, &epc->function_num_map); 5275e8cb403SKishon Vijay Abraham I list_del(&epf->list); 528db7a6248SAlan Mikhak epf->epc = NULL; 5293d3248dbSKishon Vijay Abraham I mutex_unlock(&epc->lock); 5305e8cb403SKishon Vijay Abraham I } 5315e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_remove_epf); 5325e8cb403SKishon Vijay Abraham I 5335e8cb403SKishon Vijay Abraham I /** 5345e8cb403SKishon Vijay Abraham I * pci_epc_linkup() - Notify the EPF device that EPC device has established a 5355e8cb403SKishon Vijay Abraham I * connection with the Root Complex. 5365e8cb403SKishon Vijay Abraham I * @epc: the EPC device which has established link with the host 5375e8cb403SKishon Vijay Abraham I * 5385e8cb403SKishon Vijay Abraham I * Invoke to Notify the EPF device that the EPC device has established a 5395e8cb403SKishon Vijay Abraham I * connection with the Root Complex. 5405e8cb403SKishon Vijay Abraham I */ 5415e8cb403SKishon Vijay Abraham I void pci_epc_linkup(struct pci_epc *epc) 5425e8cb403SKishon Vijay Abraham I { 5435e8cb403SKishon Vijay Abraham I if (!epc || IS_ERR(epc)) 5445e8cb403SKishon Vijay Abraham I return; 5455e8cb403SKishon Vijay Abraham I 5460ef22dcfSVidya Sagar atomic_notifier_call_chain(&epc->notifier, LINK_UP, NULL); 5475e8cb403SKishon Vijay Abraham I } 5485e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_linkup); 5495e8cb403SKishon Vijay Abraham I 5505e8cb403SKishon Vijay Abraham I /** 5510ef22dcfSVidya Sagar * pci_epc_init_notify() - Notify the EPF device that EPC device's core 5520ef22dcfSVidya Sagar * initialization is completed. 5530ef22dcfSVidya Sagar * @epc: the EPC device whose core initialization is completeds 5540ef22dcfSVidya Sagar * 5550ef22dcfSVidya Sagar * Invoke to Notify the EPF device that the EPC device's initialization 5560ef22dcfSVidya Sagar * is completed. 5570ef22dcfSVidya Sagar */ 5580ef22dcfSVidya Sagar void pci_epc_init_notify(struct pci_epc *epc) 5590ef22dcfSVidya Sagar { 5600ef22dcfSVidya Sagar if (!epc || IS_ERR(epc)) 5610ef22dcfSVidya Sagar return; 5620ef22dcfSVidya Sagar 5630ef22dcfSVidya Sagar atomic_notifier_call_chain(&epc->notifier, CORE_INIT, NULL); 5640ef22dcfSVidya Sagar } 5650ef22dcfSVidya Sagar EXPORT_SYMBOL_GPL(pci_epc_init_notify); 5660ef22dcfSVidya Sagar 5670ef22dcfSVidya Sagar /** 5685e8cb403SKishon Vijay Abraham I * pci_epc_destroy() - destroy the EPC device 5695e8cb403SKishon Vijay Abraham I * @epc: the EPC device that has to be destroyed 5705e8cb403SKishon Vijay Abraham I * 5715e8cb403SKishon Vijay Abraham I * Invoke to destroy the PCI EPC device 5725e8cb403SKishon Vijay Abraham I */ 5735e8cb403SKishon Vijay Abraham I void pci_epc_destroy(struct pci_epc *epc) 5745e8cb403SKishon Vijay Abraham I { 5753a401a2cSKishon Vijay Abraham I pci_ep_cfs_remove_epc_group(epc->group); 5765e8cb403SKishon Vijay Abraham I device_unregister(&epc->dev); 5775e8cb403SKishon Vijay Abraham I kfree(epc); 5785e8cb403SKishon Vijay Abraham I } 5795e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_destroy); 5805e8cb403SKishon Vijay Abraham I 5815e8cb403SKishon Vijay Abraham I /** 5825e8cb403SKishon Vijay Abraham I * devm_pci_epc_destroy() - destroy the EPC device 5835e8cb403SKishon Vijay Abraham I * @dev: device that wants to destroy the EPC 5845e8cb403SKishon Vijay Abraham I * @epc: the EPC device that has to be destroyed 5855e8cb403SKishon Vijay Abraham I * 5865e8cb403SKishon Vijay Abraham I * Invoke to destroy the devres associated with this 5875e8cb403SKishon Vijay Abraham I * pci_epc and destroy the EPC device. 5885e8cb403SKishon Vijay Abraham I */ 5895e8cb403SKishon Vijay Abraham I void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc) 5905e8cb403SKishon Vijay Abraham I { 5915e8cb403SKishon Vijay Abraham I int r; 5925e8cb403SKishon Vijay Abraham I 5935e8cb403SKishon Vijay Abraham I r = devres_destroy(dev, devm_pci_epc_release, devm_pci_epc_match, 5945e8cb403SKishon Vijay Abraham I epc); 5955e8cb403SKishon Vijay Abraham I dev_WARN_ONCE(dev, r, "couldn't find PCI EPC resource\n"); 5965e8cb403SKishon Vijay Abraham I } 5975e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(devm_pci_epc_destroy); 5985e8cb403SKishon Vijay Abraham I 5995e8cb403SKishon Vijay Abraham I /** 6005e8cb403SKishon Vijay Abraham I * __pci_epc_create() - create a new endpoint controller (EPC) device 6015e8cb403SKishon Vijay Abraham I * @dev: device that is creating the new EPC 6025e8cb403SKishon Vijay Abraham I * @ops: function pointers for performing EPC operations 6035e8cb403SKishon Vijay Abraham I * @owner: the owner of the module that creates the EPC device 6045e8cb403SKishon Vijay Abraham I * 6055e8cb403SKishon Vijay Abraham I * Invoke to create a new EPC device and add it to pci_epc class. 6065e8cb403SKishon Vijay Abraham I */ 6075e8cb403SKishon Vijay Abraham I struct pci_epc * 6085e8cb403SKishon Vijay Abraham I __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops, 6095e8cb403SKishon Vijay Abraham I struct module *owner) 6105e8cb403SKishon Vijay Abraham I { 6115e8cb403SKishon Vijay Abraham I int ret; 6125e8cb403SKishon Vijay Abraham I struct pci_epc *epc; 6135e8cb403SKishon Vijay Abraham I 6145e8cb403SKishon Vijay Abraham I if (WARN_ON(!dev)) { 6155e8cb403SKishon Vijay Abraham I ret = -EINVAL; 6165e8cb403SKishon Vijay Abraham I goto err_ret; 6175e8cb403SKishon Vijay Abraham I } 6185e8cb403SKishon Vijay Abraham I 6195e8cb403SKishon Vijay Abraham I epc = kzalloc(sizeof(*epc), GFP_KERNEL); 6205e8cb403SKishon Vijay Abraham I if (!epc) { 6215e8cb403SKishon Vijay Abraham I ret = -ENOMEM; 6225e8cb403SKishon Vijay Abraham I goto err_ret; 6235e8cb403SKishon Vijay Abraham I } 6245e8cb403SKishon Vijay Abraham I 6253d3248dbSKishon Vijay Abraham I mutex_init(&epc->lock); 6265e8cb403SKishon Vijay Abraham I INIT_LIST_HEAD(&epc->pci_epf); 6275779dd0aSKishon Vijay Abraham I ATOMIC_INIT_NOTIFIER_HEAD(&epc->notifier); 6285e8cb403SKishon Vijay Abraham I 6295e8cb403SKishon Vijay Abraham I device_initialize(&epc->dev); 6305e8cb403SKishon Vijay Abraham I epc->dev.class = pci_epc_class; 63164c1a02aSKishon Vijay Abraham I epc->dev.parent = dev; 6325e8cb403SKishon Vijay Abraham I epc->ops = ops; 6335e8cb403SKishon Vijay Abraham I 6345e8cb403SKishon Vijay Abraham I ret = dev_set_name(&epc->dev, "%s", dev_name(dev)); 6355e8cb403SKishon Vijay Abraham I if (ret) 6365e8cb403SKishon Vijay Abraham I goto put_dev; 6375e8cb403SKishon Vijay Abraham I 6385e8cb403SKishon Vijay Abraham I ret = device_add(&epc->dev); 6395e8cb403SKishon Vijay Abraham I if (ret) 6405e8cb403SKishon Vijay Abraham I goto put_dev; 6415e8cb403SKishon Vijay Abraham I 6423a401a2cSKishon Vijay Abraham I epc->group = pci_ep_cfs_add_epc_group(dev_name(dev)); 6433a401a2cSKishon Vijay Abraham I 6445e8cb403SKishon Vijay Abraham I return epc; 6455e8cb403SKishon Vijay Abraham I 6465e8cb403SKishon Vijay Abraham I put_dev: 6475e8cb403SKishon Vijay Abraham I put_device(&epc->dev); 6485e8cb403SKishon Vijay Abraham I kfree(epc); 6495e8cb403SKishon Vijay Abraham I 6505e8cb403SKishon Vijay Abraham I err_ret: 6515e8cb403SKishon Vijay Abraham I return ERR_PTR(ret); 6525e8cb403SKishon Vijay Abraham I } 6535e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(__pci_epc_create); 6545e8cb403SKishon Vijay Abraham I 6555e8cb403SKishon Vijay Abraham I /** 6565e8cb403SKishon Vijay Abraham I * __devm_pci_epc_create() - create a new endpoint controller (EPC) device 6575e8cb403SKishon Vijay Abraham I * @dev: device that is creating the new EPC 6585e8cb403SKishon Vijay Abraham I * @ops: function pointers for performing EPC operations 6595e8cb403SKishon Vijay Abraham I * @owner: the owner of the module that creates the EPC device 6605e8cb403SKishon Vijay Abraham I * 6615e8cb403SKishon Vijay Abraham I * Invoke to create a new EPC device and add it to pci_epc class. 6625e8cb403SKishon Vijay Abraham I * While at that, it also associates the device with the pci_epc using devres. 6635e8cb403SKishon Vijay Abraham I * On driver detach, release function is invoked on the devres data, 6645e8cb403SKishon Vijay Abraham I * then, devres data is freed. 6655e8cb403SKishon Vijay Abraham I */ 6665e8cb403SKishon Vijay Abraham I struct pci_epc * 6675e8cb403SKishon Vijay Abraham I __devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops, 6685e8cb403SKishon Vijay Abraham I struct module *owner) 6695e8cb403SKishon Vijay Abraham I { 6705e8cb403SKishon Vijay Abraham I struct pci_epc **ptr, *epc; 6715e8cb403SKishon Vijay Abraham I 6725e8cb403SKishon Vijay Abraham I ptr = devres_alloc(devm_pci_epc_release, sizeof(*ptr), GFP_KERNEL); 6735e8cb403SKishon Vijay Abraham I if (!ptr) 6745e8cb403SKishon Vijay Abraham I return ERR_PTR(-ENOMEM); 6755e8cb403SKishon Vijay Abraham I 6765e8cb403SKishon Vijay Abraham I epc = __pci_epc_create(dev, ops, owner); 6775e8cb403SKishon Vijay Abraham I if (!IS_ERR(epc)) { 6785e8cb403SKishon Vijay Abraham I *ptr = epc; 6795e8cb403SKishon Vijay Abraham I devres_add(dev, ptr); 6805e8cb403SKishon Vijay Abraham I } else { 6815e8cb403SKishon Vijay Abraham I devres_free(ptr); 6825e8cb403SKishon Vijay Abraham I } 6835e8cb403SKishon Vijay Abraham I 6845e8cb403SKishon Vijay Abraham I return epc; 6855e8cb403SKishon Vijay Abraham I } 6865e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(__devm_pci_epc_create); 6875e8cb403SKishon Vijay Abraham I 6885e8cb403SKishon Vijay Abraham I static int __init pci_epc_init(void) 6895e8cb403SKishon Vijay Abraham I { 6905e8cb403SKishon Vijay Abraham I pci_epc_class = class_create(THIS_MODULE, "pci_epc"); 6915e8cb403SKishon Vijay Abraham I if (IS_ERR(pci_epc_class)) { 6925e8cb403SKishon Vijay Abraham I pr_err("failed to create pci epc class --> %ld\n", 6935e8cb403SKishon Vijay Abraham I PTR_ERR(pci_epc_class)); 6945e8cb403SKishon Vijay Abraham I return PTR_ERR(pci_epc_class); 6955e8cb403SKishon Vijay Abraham I } 6965e8cb403SKishon Vijay Abraham I 6975e8cb403SKishon Vijay Abraham I return 0; 6985e8cb403SKishon Vijay Abraham I } 6995e8cb403SKishon Vijay Abraham I module_init(pci_epc_init); 7005e8cb403SKishon Vijay Abraham I 7015e8cb403SKishon Vijay Abraham I static void __exit pci_epc_exit(void) 7025e8cb403SKishon Vijay Abraham I { 7035e8cb403SKishon Vijay Abraham I class_destroy(pci_epc_class); 7045e8cb403SKishon Vijay Abraham I } 7055e8cb403SKishon Vijay Abraham I module_exit(pci_epc_exit); 7065e8cb403SKishon Vijay Abraham I 7075e8cb403SKishon Vijay Abraham I MODULE_DESCRIPTION("PCI EPC Library"); 7085e8cb403SKishon Vijay Abraham I MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>"); 7095e8cb403SKishon Vijay Abraham I MODULE_LICENSE("GPL v2"); 710