15e8cb403SKishon Vijay Abraham I /** 25e8cb403SKishon Vijay Abraham I * PCI Endpoint *Controller* (EPC) library 35e8cb403SKishon Vijay Abraham I * 45e8cb403SKishon Vijay Abraham I * Copyright (C) 2017 Texas Instruments 55e8cb403SKishon Vijay Abraham I * Author: Kishon Vijay Abraham I <kishon@ti.com> 65e8cb403SKishon Vijay Abraham I * 75e8cb403SKishon Vijay Abraham I * This program is free software: you can redistribute it and/or modify 85e8cb403SKishon Vijay Abraham I * it under the terms of the GNU General Public License version 2 of 95e8cb403SKishon Vijay Abraham I * the License as published by the Free Software Foundation. 105e8cb403SKishon Vijay Abraham I * 115e8cb403SKishon Vijay Abraham I * This program is distributed in the hope that it will be useful, 125e8cb403SKishon Vijay Abraham I * but WITHOUT ANY WARRANTY; without even the implied warranty of 135e8cb403SKishon Vijay Abraham I * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 145e8cb403SKishon Vijay Abraham I * GNU General Public License for more details. 155e8cb403SKishon Vijay Abraham I * 165e8cb403SKishon Vijay Abraham I * You should have received a copy of the GNU General Public License 175e8cb403SKishon Vijay Abraham I * along with this program. If not, see <http://www.gnu.org/licenses/>. 185e8cb403SKishon Vijay Abraham I */ 195e8cb403SKishon Vijay Abraham I 205e8cb403SKishon Vijay Abraham I #include <linux/device.h> 215e8cb403SKishon Vijay Abraham I #include <linux/dma-mapping.h> 225e8cb403SKishon Vijay Abraham I #include <linux/slab.h> 235e8cb403SKishon Vijay Abraham I #include <linux/module.h> 245e8cb403SKishon Vijay Abraham I 255e8cb403SKishon Vijay Abraham I #include <linux/pci-epc.h> 265e8cb403SKishon Vijay Abraham I #include <linux/pci-epf.h> 275e8cb403SKishon Vijay Abraham I 285e8cb403SKishon Vijay Abraham I static struct class *pci_epc_class; 295e8cb403SKishon Vijay Abraham I 305e8cb403SKishon Vijay Abraham I static void devm_pci_epc_release(struct device *dev, void *res) 315e8cb403SKishon Vijay Abraham I { 325e8cb403SKishon Vijay Abraham I struct pci_epc *epc = *(struct pci_epc **)res; 335e8cb403SKishon Vijay Abraham I 345e8cb403SKishon Vijay Abraham I pci_epc_destroy(epc); 355e8cb403SKishon Vijay Abraham I } 365e8cb403SKishon Vijay Abraham I 375e8cb403SKishon Vijay Abraham I static int devm_pci_epc_match(struct device *dev, void *res, void *match_data) 385e8cb403SKishon Vijay Abraham I { 395e8cb403SKishon Vijay Abraham I struct pci_epc **epc = res; 405e8cb403SKishon Vijay Abraham I 415e8cb403SKishon Vijay Abraham I return *epc == match_data; 425e8cb403SKishon Vijay Abraham I } 435e8cb403SKishon Vijay Abraham I 445e8cb403SKishon Vijay Abraham I /** 455e8cb403SKishon Vijay Abraham I * pci_epc_put() - release the PCI endpoint controller 465e8cb403SKishon Vijay Abraham I * @epc: epc returned by pci_epc_get() 475e8cb403SKishon Vijay Abraham I * 485e8cb403SKishon Vijay Abraham I * release the refcount the caller obtained by invoking pci_epc_get() 495e8cb403SKishon Vijay Abraham I */ 505e8cb403SKishon Vijay Abraham I void pci_epc_put(struct pci_epc *epc) 515e8cb403SKishon Vijay Abraham I { 525e8cb403SKishon Vijay Abraham I if (!epc || IS_ERR(epc)) 535e8cb403SKishon Vijay Abraham I return; 545e8cb403SKishon Vijay Abraham I 555e8cb403SKishon Vijay Abraham I module_put(epc->ops->owner); 565e8cb403SKishon Vijay Abraham I put_device(&epc->dev); 575e8cb403SKishon Vijay Abraham I } 585e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_put); 595e8cb403SKishon Vijay Abraham I 605e8cb403SKishon Vijay Abraham I /** 615e8cb403SKishon Vijay Abraham I * pci_epc_get() - get the PCI endpoint controller 625e8cb403SKishon Vijay Abraham I * @epc_name: device name of the endpoint controller 635e8cb403SKishon Vijay Abraham I * 645e8cb403SKishon Vijay Abraham I * Invoke to get struct pci_epc * corresponding to the device name of the 655e8cb403SKishon Vijay Abraham I * endpoint controller 665e8cb403SKishon Vijay Abraham I */ 675e8cb403SKishon Vijay Abraham I struct pci_epc *pci_epc_get(const char *epc_name) 685e8cb403SKishon Vijay Abraham I { 695e8cb403SKishon Vijay Abraham I int ret = -EINVAL; 705e8cb403SKishon Vijay Abraham I struct pci_epc *epc; 715e8cb403SKishon Vijay Abraham I struct device *dev; 725e8cb403SKishon Vijay Abraham I struct class_dev_iter iter; 735e8cb403SKishon Vijay Abraham I 745e8cb403SKishon Vijay Abraham I class_dev_iter_init(&iter, pci_epc_class, NULL, NULL); 755e8cb403SKishon Vijay Abraham I while ((dev = class_dev_iter_next(&iter))) { 765e8cb403SKishon Vijay Abraham I if (strcmp(epc_name, dev_name(dev))) 775e8cb403SKishon Vijay Abraham I continue; 785e8cb403SKishon Vijay Abraham I 795e8cb403SKishon Vijay Abraham I epc = to_pci_epc(dev); 805e8cb403SKishon Vijay Abraham I if (!try_module_get(epc->ops->owner)) { 815e8cb403SKishon Vijay Abraham I ret = -EINVAL; 825e8cb403SKishon Vijay Abraham I goto err; 835e8cb403SKishon Vijay Abraham I } 845e8cb403SKishon Vijay Abraham I 855e8cb403SKishon Vijay Abraham I class_dev_iter_exit(&iter); 865e8cb403SKishon Vijay Abraham I get_device(&epc->dev); 875e8cb403SKishon Vijay Abraham I return epc; 885e8cb403SKishon Vijay Abraham I } 895e8cb403SKishon Vijay Abraham I 905e8cb403SKishon Vijay Abraham I err: 915e8cb403SKishon Vijay Abraham I class_dev_iter_exit(&iter); 925e8cb403SKishon Vijay Abraham I return ERR_PTR(ret); 935e8cb403SKishon Vijay Abraham I } 945e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_get); 955e8cb403SKishon Vijay Abraham I 965e8cb403SKishon Vijay Abraham I /** 975e8cb403SKishon Vijay Abraham I * pci_epc_stop() - stop the PCI link 985e8cb403SKishon Vijay Abraham I * @epc: the link of the EPC device that has to be stopped 995e8cb403SKishon Vijay Abraham I * 1005e8cb403SKishon Vijay Abraham I * Invoke to stop the PCI link 1015e8cb403SKishon Vijay Abraham I */ 1025e8cb403SKishon Vijay Abraham I void pci_epc_stop(struct pci_epc *epc) 1035e8cb403SKishon Vijay Abraham I { 1045e8cb403SKishon Vijay Abraham I unsigned long flags; 1055e8cb403SKishon Vijay Abraham I 1065e8cb403SKishon Vijay Abraham I if (IS_ERR(epc) || !epc->ops->stop) 1075e8cb403SKishon Vijay Abraham I return; 1085e8cb403SKishon Vijay Abraham I 1095e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 1105e8cb403SKishon Vijay Abraham I epc->ops->stop(epc); 1115e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 1125e8cb403SKishon Vijay Abraham I } 1135e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_stop); 1145e8cb403SKishon Vijay Abraham I 1155e8cb403SKishon Vijay Abraham I /** 1165e8cb403SKishon Vijay Abraham I * pci_epc_start() - start the PCI link 1175e8cb403SKishon Vijay Abraham I * @epc: the link of *this* EPC device has to be started 1185e8cb403SKishon Vijay Abraham I * 1195e8cb403SKishon Vijay Abraham I * Invoke to start the PCI link 1205e8cb403SKishon Vijay Abraham I */ 1215e8cb403SKishon Vijay Abraham I int pci_epc_start(struct pci_epc *epc) 1225e8cb403SKishon Vijay Abraham I { 1235e8cb403SKishon Vijay Abraham I int ret; 1245e8cb403SKishon Vijay Abraham I unsigned long flags; 1255e8cb403SKishon Vijay Abraham I 1265e8cb403SKishon Vijay Abraham I if (IS_ERR(epc)) 1275e8cb403SKishon Vijay Abraham I return -EINVAL; 1285e8cb403SKishon Vijay Abraham I 1295e8cb403SKishon Vijay Abraham I if (!epc->ops->start) 1305e8cb403SKishon Vijay Abraham I return 0; 1315e8cb403SKishon Vijay Abraham I 1325e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 1335e8cb403SKishon Vijay Abraham I ret = epc->ops->start(epc); 1345e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 1355e8cb403SKishon Vijay Abraham I 1365e8cb403SKishon Vijay Abraham I return ret; 1375e8cb403SKishon Vijay Abraham I } 1385e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_start); 1395e8cb403SKishon Vijay Abraham I 1405e8cb403SKishon Vijay Abraham I /** 1415e8cb403SKishon Vijay Abraham I * pci_epc_raise_irq() - interrupt the host system 1425e8cb403SKishon Vijay Abraham I * @epc: the EPC device which has to interrupt the host 1435e8cb403SKishon Vijay Abraham I * @type: specify the type of interrupt; legacy or MSI 1445e8cb403SKishon Vijay Abraham I * @interrupt_num: the MSI interrupt number 1455e8cb403SKishon Vijay Abraham I * 1465e8cb403SKishon Vijay Abraham I * Invoke to raise an MSI or legacy interrupt 1475e8cb403SKishon Vijay Abraham I */ 1485e8cb403SKishon Vijay Abraham I int pci_epc_raise_irq(struct pci_epc *epc, enum pci_epc_irq_type type, 1495e8cb403SKishon Vijay Abraham I u8 interrupt_num) 1505e8cb403SKishon Vijay Abraham I { 1515e8cb403SKishon Vijay Abraham I int ret; 1525e8cb403SKishon Vijay Abraham I unsigned long flags; 1535e8cb403SKishon Vijay Abraham I 1545e8cb403SKishon Vijay Abraham I if (IS_ERR(epc)) 1555e8cb403SKishon Vijay Abraham I return -EINVAL; 1565e8cb403SKishon Vijay Abraham I 1575e8cb403SKishon Vijay Abraham I if (!epc->ops->raise_irq) 1585e8cb403SKishon Vijay Abraham I return 0; 1595e8cb403SKishon Vijay Abraham I 1605e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 1615e8cb403SKishon Vijay Abraham I ret = epc->ops->raise_irq(epc, type, interrupt_num); 1625e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 1635e8cb403SKishon Vijay Abraham I 1645e8cb403SKishon Vijay Abraham I return ret; 1655e8cb403SKishon Vijay Abraham I } 1665e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_raise_irq); 1675e8cb403SKishon Vijay Abraham I 1685e8cb403SKishon Vijay Abraham I /** 1695e8cb403SKishon Vijay Abraham I * pci_epc_get_msi() - get the number of MSI interrupt numbers allocated 1705e8cb403SKishon Vijay Abraham I * @epc: the EPC device to which MSI interrupts was requested 1715e8cb403SKishon Vijay Abraham I * 1725e8cb403SKishon Vijay Abraham I * Invoke to get the number of MSI interrupts allocated by the RC 1735e8cb403SKishon Vijay Abraham I */ 1745e8cb403SKishon Vijay Abraham I int pci_epc_get_msi(struct pci_epc *epc) 1755e8cb403SKishon Vijay Abraham I { 1765e8cb403SKishon Vijay Abraham I int interrupt; 1775e8cb403SKishon Vijay Abraham I unsigned long flags; 1785e8cb403SKishon Vijay Abraham I 1795e8cb403SKishon Vijay Abraham I if (IS_ERR(epc)) 1805e8cb403SKishon Vijay Abraham I return 0; 1815e8cb403SKishon Vijay Abraham I 1825e8cb403SKishon Vijay Abraham I if (!epc->ops->get_msi) 1835e8cb403SKishon Vijay Abraham I return 0; 1845e8cb403SKishon Vijay Abraham I 1855e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 1865e8cb403SKishon Vijay Abraham I interrupt = epc->ops->get_msi(epc); 1875e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 1885e8cb403SKishon Vijay Abraham I 1895e8cb403SKishon Vijay Abraham I if (interrupt < 0) 1905e8cb403SKishon Vijay Abraham I return 0; 1915e8cb403SKishon Vijay Abraham I 1925e8cb403SKishon Vijay Abraham I interrupt = 1 << interrupt; 1935e8cb403SKishon Vijay Abraham I 1945e8cb403SKishon Vijay Abraham I return interrupt; 1955e8cb403SKishon Vijay Abraham I } 1965e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_get_msi); 1975e8cb403SKishon Vijay Abraham I 1985e8cb403SKishon Vijay Abraham I /** 1995e8cb403SKishon Vijay Abraham I * pci_epc_set_msi() - set the number of MSI interrupt numbers required 2005e8cb403SKishon Vijay Abraham I * @epc: the EPC device on which MSI has to be configured 2015e8cb403SKishon Vijay Abraham I * @interrupts: number of MSI interrupts required by the EPF 2025e8cb403SKishon Vijay Abraham I * 2035e8cb403SKishon Vijay Abraham I * Invoke to set the required number of MSI interrupts. 2045e8cb403SKishon Vijay Abraham I */ 2055e8cb403SKishon Vijay Abraham I int pci_epc_set_msi(struct pci_epc *epc, u8 interrupts) 2065e8cb403SKishon Vijay Abraham I { 2075e8cb403SKishon Vijay Abraham I int ret; 2085e8cb403SKishon Vijay Abraham I u8 encode_int; 2095e8cb403SKishon Vijay Abraham I unsigned long flags; 2105e8cb403SKishon Vijay Abraham I 2115e8cb403SKishon Vijay Abraham I if (IS_ERR(epc)) 2125e8cb403SKishon Vijay Abraham I return -EINVAL; 2135e8cb403SKishon Vijay Abraham I 2145e8cb403SKishon Vijay Abraham I if (!epc->ops->set_msi) 2155e8cb403SKishon Vijay Abraham I return 0; 2165e8cb403SKishon Vijay Abraham I 2175e8cb403SKishon Vijay Abraham I encode_int = order_base_2(interrupts); 2185e8cb403SKishon Vijay Abraham I 2195e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 2205e8cb403SKishon Vijay Abraham I ret = epc->ops->set_msi(epc, encode_int); 2215e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 2225e8cb403SKishon Vijay Abraham I 2235e8cb403SKishon Vijay Abraham I return ret; 2245e8cb403SKishon Vijay Abraham I } 2255e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_set_msi); 2265e8cb403SKishon Vijay Abraham I 2275e8cb403SKishon Vijay Abraham I /** 2285e8cb403SKishon Vijay Abraham I * pci_epc_unmap_addr() - unmap CPU address from PCI address 2295e8cb403SKishon Vijay Abraham I * @epc: the EPC device on which address is allocated 2305e8cb403SKishon Vijay Abraham I * @phys_addr: physical address of the local system 2315e8cb403SKishon Vijay Abraham I * 2325e8cb403SKishon Vijay Abraham I * Invoke to unmap the CPU address from PCI address. 2335e8cb403SKishon Vijay Abraham I */ 2345e8cb403SKishon Vijay Abraham I void pci_epc_unmap_addr(struct pci_epc *epc, phys_addr_t phys_addr) 2355e8cb403SKishon Vijay Abraham I { 2365e8cb403SKishon Vijay Abraham I unsigned long flags; 2375e8cb403SKishon Vijay Abraham I 2385e8cb403SKishon Vijay Abraham I if (IS_ERR(epc)) 2395e8cb403SKishon Vijay Abraham I return; 2405e8cb403SKishon Vijay Abraham I 2415e8cb403SKishon Vijay Abraham I if (!epc->ops->unmap_addr) 2425e8cb403SKishon Vijay Abraham I return; 2435e8cb403SKishon Vijay Abraham I 2445e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 2455e8cb403SKishon Vijay Abraham I epc->ops->unmap_addr(epc, phys_addr); 2465e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 2475e8cb403SKishon Vijay Abraham I } 2485e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_unmap_addr); 2495e8cb403SKishon Vijay Abraham I 2505e8cb403SKishon Vijay Abraham I /** 2515e8cb403SKishon Vijay Abraham I * pci_epc_map_addr() - map CPU address to PCI address 2525e8cb403SKishon Vijay Abraham I * @epc: the EPC device on which address is allocated 2535e8cb403SKishon Vijay Abraham I * @phys_addr: physical address of the local system 2545e8cb403SKishon Vijay Abraham I * @pci_addr: PCI address to which the physical address should be mapped 2555e8cb403SKishon Vijay Abraham I * @size: the size of the allocation 2565e8cb403SKishon Vijay Abraham I * 2575e8cb403SKishon Vijay Abraham I * Invoke to map CPU address with PCI address. 2585e8cb403SKishon Vijay Abraham I */ 2595e8cb403SKishon Vijay Abraham I int pci_epc_map_addr(struct pci_epc *epc, phys_addr_t phys_addr, 2605e8cb403SKishon Vijay Abraham I u64 pci_addr, size_t size) 2615e8cb403SKishon Vijay Abraham I { 2625e8cb403SKishon Vijay Abraham I int ret; 2635e8cb403SKishon Vijay Abraham I unsigned long flags; 2645e8cb403SKishon Vijay Abraham I 2655e8cb403SKishon Vijay Abraham I if (IS_ERR(epc)) 2665e8cb403SKishon Vijay Abraham I return -EINVAL; 2675e8cb403SKishon Vijay Abraham I 2685e8cb403SKishon Vijay Abraham I if (!epc->ops->map_addr) 2695e8cb403SKishon Vijay Abraham I return 0; 2705e8cb403SKishon Vijay Abraham I 2715e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 2725e8cb403SKishon Vijay Abraham I ret = epc->ops->map_addr(epc, phys_addr, pci_addr, size); 2735e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 2745e8cb403SKishon Vijay Abraham I 2755e8cb403SKishon Vijay Abraham I return ret; 2765e8cb403SKishon Vijay Abraham I } 2775e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_map_addr); 2785e8cb403SKishon Vijay Abraham I 2795e8cb403SKishon Vijay Abraham I /** 2805e8cb403SKishon Vijay Abraham I * pci_epc_clear_bar() - reset the BAR 2815e8cb403SKishon Vijay Abraham I * @epc: the EPC device for which the BAR has to be cleared 2825e8cb403SKishon Vijay Abraham I * @bar: the BAR number that has to be reset 2835e8cb403SKishon Vijay Abraham I * 2845e8cb403SKishon Vijay Abraham I * Invoke to reset the BAR of the endpoint device. 2855e8cb403SKishon Vijay Abraham I */ 2865e8cb403SKishon Vijay Abraham I void pci_epc_clear_bar(struct pci_epc *epc, int bar) 2875e8cb403SKishon Vijay Abraham I { 2885e8cb403SKishon Vijay Abraham I unsigned long flags; 2895e8cb403SKishon Vijay Abraham I 2905e8cb403SKishon Vijay Abraham I if (IS_ERR(epc)) 2915e8cb403SKishon Vijay Abraham I return; 2925e8cb403SKishon Vijay Abraham I 2935e8cb403SKishon Vijay Abraham I if (!epc->ops->clear_bar) 2945e8cb403SKishon Vijay Abraham I return; 2955e8cb403SKishon Vijay Abraham I 2965e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 2975e8cb403SKishon Vijay Abraham I epc->ops->clear_bar(epc, bar); 2985e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 2995e8cb403SKishon Vijay Abraham I } 3005e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_clear_bar); 3015e8cb403SKishon Vijay Abraham I 3025e8cb403SKishon Vijay Abraham I /** 3035e8cb403SKishon Vijay Abraham I * pci_epc_set_bar() - configure BAR in order for host to assign PCI addr space 3045e8cb403SKishon Vijay Abraham I * @epc: the EPC device on which BAR has to be configured 3055e8cb403SKishon Vijay Abraham I * @bar: the BAR number that has to be configured 3065e8cb403SKishon Vijay Abraham I * @size: the size of the addr space 3075e8cb403SKishon Vijay Abraham I * @flags: specify memory allocation/io allocation/32bit address/64 bit address 3085e8cb403SKishon Vijay Abraham I * 3095e8cb403SKishon Vijay Abraham I * Invoke to configure the BAR of the endpoint device. 3105e8cb403SKishon Vijay Abraham I */ 3115e8cb403SKishon Vijay Abraham I int pci_epc_set_bar(struct pci_epc *epc, enum pci_barno bar, 3125e8cb403SKishon Vijay Abraham I dma_addr_t bar_phys, size_t size, int flags) 3135e8cb403SKishon Vijay Abraham I { 3145e8cb403SKishon Vijay Abraham I int ret; 3155e8cb403SKishon Vijay Abraham I unsigned long irq_flags; 3165e8cb403SKishon Vijay Abraham I 3175e8cb403SKishon Vijay Abraham I if (IS_ERR(epc)) 3185e8cb403SKishon Vijay Abraham I return -EINVAL; 3195e8cb403SKishon Vijay Abraham I 3205e8cb403SKishon Vijay Abraham I if (!epc->ops->set_bar) 3215e8cb403SKishon Vijay Abraham I return 0; 3225e8cb403SKishon Vijay Abraham I 3235e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, irq_flags); 3245e8cb403SKishon Vijay Abraham I ret = epc->ops->set_bar(epc, bar, bar_phys, size, flags); 3255e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, irq_flags); 3265e8cb403SKishon Vijay Abraham I 3275e8cb403SKishon Vijay Abraham I return ret; 3285e8cb403SKishon Vijay Abraham I } 3295e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_set_bar); 3305e8cb403SKishon Vijay Abraham I 3315e8cb403SKishon Vijay Abraham I /** 3325e8cb403SKishon Vijay Abraham I * pci_epc_write_header() - write standard configuration header 3335e8cb403SKishon Vijay Abraham I * @epc: the EPC device to which the configuration header should be written 3345e8cb403SKishon Vijay Abraham I * @header: standard configuration header fields 3355e8cb403SKishon Vijay Abraham I * 3365e8cb403SKishon Vijay Abraham I * Invoke to write the configuration header to the endpoint controller. Every 3375e8cb403SKishon Vijay Abraham I * endpoint controller will have a dedicated location to which the standard 3385e8cb403SKishon Vijay Abraham I * configuration header would be written. The callback function should write 3395e8cb403SKishon Vijay Abraham I * the header fields to this dedicated location. 3405e8cb403SKishon Vijay Abraham I */ 3415e8cb403SKishon Vijay Abraham I int pci_epc_write_header(struct pci_epc *epc, struct pci_epf_header *header) 3425e8cb403SKishon Vijay Abraham I { 3435e8cb403SKishon Vijay Abraham I int ret; 3445e8cb403SKishon Vijay Abraham I unsigned long flags; 3455e8cb403SKishon Vijay Abraham I 3465e8cb403SKishon Vijay Abraham I if (IS_ERR(epc)) 3475e8cb403SKishon Vijay Abraham I return -EINVAL; 3485e8cb403SKishon Vijay Abraham I 3495e8cb403SKishon Vijay Abraham I if (!epc->ops->write_header) 3505e8cb403SKishon Vijay Abraham I return 0; 3515e8cb403SKishon Vijay Abraham I 3525e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 3535e8cb403SKishon Vijay Abraham I ret = epc->ops->write_header(epc, header); 3545e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 3555e8cb403SKishon Vijay Abraham I 3565e8cb403SKishon Vijay Abraham I return ret; 3575e8cb403SKishon Vijay Abraham I } 3585e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_write_header); 3595e8cb403SKishon Vijay Abraham I 3605e8cb403SKishon Vijay Abraham I /** 3615e8cb403SKishon Vijay Abraham I * pci_epc_add_epf() - bind PCI endpoint function to an endpoint controller 3625e8cb403SKishon Vijay Abraham I * @epc: the EPC device to which the endpoint function should be added 3635e8cb403SKishon Vijay Abraham I * @epf: the endpoint function to be added 3645e8cb403SKishon Vijay Abraham I * 3655e8cb403SKishon Vijay Abraham I * A PCI endpoint device can have one or more functions. In the case of PCIe, 3665e8cb403SKishon Vijay Abraham I * the specification allows up to 8 PCIe endpoint functions. Invoke 3675e8cb403SKishon Vijay Abraham I * pci_epc_add_epf() to add a PCI endpoint function to an endpoint controller. 3685e8cb403SKishon Vijay Abraham I */ 3695e8cb403SKishon Vijay Abraham I int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf) 3705e8cb403SKishon Vijay Abraham I { 3715e8cb403SKishon Vijay Abraham I unsigned long flags; 3725e8cb403SKishon Vijay Abraham I 3735e8cb403SKishon Vijay Abraham I if (epf->epc) 3745e8cb403SKishon Vijay Abraham I return -EBUSY; 3755e8cb403SKishon Vijay Abraham I 3765e8cb403SKishon Vijay Abraham I if (IS_ERR(epc)) 3775e8cb403SKishon Vijay Abraham I return -EINVAL; 3785e8cb403SKishon Vijay Abraham I 3795e8cb403SKishon Vijay Abraham I if (epf->func_no > epc->max_functions - 1) 3805e8cb403SKishon Vijay Abraham I return -EINVAL; 3815e8cb403SKishon Vijay Abraham I 3825e8cb403SKishon Vijay Abraham I epf->epc = epc; 3835e8cb403SKishon Vijay Abraham I dma_set_coherent_mask(&epf->dev, epc->dev.coherent_dma_mask); 3845e8cb403SKishon Vijay Abraham I epf->dev.dma_mask = epc->dev.dma_mask; 3855e8cb403SKishon Vijay Abraham I 3865e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 3875e8cb403SKishon Vijay Abraham I list_add_tail(&epf->list, &epc->pci_epf); 3885e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 3895e8cb403SKishon Vijay Abraham I 3905e8cb403SKishon Vijay Abraham I return 0; 3915e8cb403SKishon Vijay Abraham I } 3925e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_add_epf); 3935e8cb403SKishon Vijay Abraham I 3945e8cb403SKishon Vijay Abraham I /** 3955e8cb403SKishon Vijay Abraham I * pci_epc_remove_epf() - remove PCI endpoint function from endpoint controller 3965e8cb403SKishon Vijay Abraham I * @epc: the EPC device from which the endpoint function should be removed 3975e8cb403SKishon Vijay Abraham I * @epf: the endpoint function to be removed 3985e8cb403SKishon Vijay Abraham I * 3995e8cb403SKishon Vijay Abraham I * Invoke to remove PCI endpoint function from the endpoint controller. 4005e8cb403SKishon Vijay Abraham I */ 4015e8cb403SKishon Vijay Abraham I void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf) 4025e8cb403SKishon Vijay Abraham I { 4035e8cb403SKishon Vijay Abraham I unsigned long flags; 4045e8cb403SKishon Vijay Abraham I 4055e8cb403SKishon Vijay Abraham I if (!epc || IS_ERR(epc)) 4065e8cb403SKishon Vijay Abraham I return; 4075e8cb403SKishon Vijay Abraham I 4085e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 4095e8cb403SKishon Vijay Abraham I list_del(&epf->list); 4105e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 4115e8cb403SKishon Vijay Abraham I } 4125e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_remove_epf); 4135e8cb403SKishon Vijay Abraham I 4145e8cb403SKishon Vijay Abraham I /** 4155e8cb403SKishon Vijay Abraham I * pci_epc_linkup() - Notify the EPF device that EPC device has established a 4165e8cb403SKishon Vijay Abraham I * connection with the Root Complex. 4175e8cb403SKishon Vijay Abraham I * @epc: the EPC device which has established link with the host 4185e8cb403SKishon Vijay Abraham I * 4195e8cb403SKishon Vijay Abraham I * Invoke to Notify the EPF device that the EPC device has established a 4205e8cb403SKishon Vijay Abraham I * connection with the Root Complex. 4215e8cb403SKishon Vijay Abraham I */ 4225e8cb403SKishon Vijay Abraham I void pci_epc_linkup(struct pci_epc *epc) 4235e8cb403SKishon Vijay Abraham I { 4245e8cb403SKishon Vijay Abraham I unsigned long flags; 4255e8cb403SKishon Vijay Abraham I struct pci_epf *epf; 4265e8cb403SKishon Vijay Abraham I 4275e8cb403SKishon Vijay Abraham I if (!epc || IS_ERR(epc)) 4285e8cb403SKishon Vijay Abraham I return; 4295e8cb403SKishon Vijay Abraham I 4305e8cb403SKishon Vijay Abraham I spin_lock_irqsave(&epc->lock, flags); 4315e8cb403SKishon Vijay Abraham I list_for_each_entry(epf, &epc->pci_epf, list) 4325e8cb403SKishon Vijay Abraham I pci_epf_linkup(epf); 4335e8cb403SKishon Vijay Abraham I spin_unlock_irqrestore(&epc->lock, flags); 4345e8cb403SKishon Vijay Abraham I } 4355e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_linkup); 4365e8cb403SKishon Vijay Abraham I 4375e8cb403SKishon Vijay Abraham I /** 4385e8cb403SKishon Vijay Abraham I * pci_epc_destroy() - destroy the EPC device 4395e8cb403SKishon Vijay Abraham I * @epc: the EPC device that has to be destroyed 4405e8cb403SKishon Vijay Abraham I * 4415e8cb403SKishon Vijay Abraham I * Invoke to destroy the PCI EPC device 4425e8cb403SKishon Vijay Abraham I */ 4435e8cb403SKishon Vijay Abraham I void pci_epc_destroy(struct pci_epc *epc) 4445e8cb403SKishon Vijay Abraham I { 4455e8cb403SKishon Vijay Abraham I device_unregister(&epc->dev); 4465e8cb403SKishon Vijay Abraham I kfree(epc); 4475e8cb403SKishon Vijay Abraham I } 4485e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(pci_epc_destroy); 4495e8cb403SKishon Vijay Abraham I 4505e8cb403SKishon Vijay Abraham I /** 4515e8cb403SKishon Vijay Abraham I * devm_pci_epc_destroy() - destroy the EPC device 4525e8cb403SKishon Vijay Abraham I * @dev: device that wants to destroy the EPC 4535e8cb403SKishon Vijay Abraham I * @epc: the EPC device that has to be destroyed 4545e8cb403SKishon Vijay Abraham I * 4555e8cb403SKishon Vijay Abraham I * Invoke to destroy the devres associated with this 4565e8cb403SKishon Vijay Abraham I * pci_epc and destroy the EPC device. 4575e8cb403SKishon Vijay Abraham I */ 4585e8cb403SKishon Vijay Abraham I void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc) 4595e8cb403SKishon Vijay Abraham I { 4605e8cb403SKishon Vijay Abraham I int r; 4615e8cb403SKishon Vijay Abraham I 4625e8cb403SKishon Vijay Abraham I r = devres_destroy(dev, devm_pci_epc_release, devm_pci_epc_match, 4635e8cb403SKishon Vijay Abraham I epc); 4645e8cb403SKishon Vijay Abraham I dev_WARN_ONCE(dev, r, "couldn't find PCI EPC resource\n"); 4655e8cb403SKishon Vijay Abraham I } 4665e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(devm_pci_epc_destroy); 4675e8cb403SKishon Vijay Abraham I 4685e8cb403SKishon Vijay Abraham I /** 4695e8cb403SKishon Vijay Abraham I * __pci_epc_create() - create a new endpoint controller (EPC) device 4705e8cb403SKishon Vijay Abraham I * @dev: device that is creating the new EPC 4715e8cb403SKishon Vijay Abraham I * @ops: function pointers for performing EPC operations 4725e8cb403SKishon Vijay Abraham I * @owner: the owner of the module that creates the EPC device 4735e8cb403SKishon Vijay Abraham I * 4745e8cb403SKishon Vijay Abraham I * Invoke to create a new EPC device and add it to pci_epc class. 4755e8cb403SKishon Vijay Abraham I */ 4765e8cb403SKishon Vijay Abraham I struct pci_epc * 4775e8cb403SKishon Vijay Abraham I __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops, 4785e8cb403SKishon Vijay Abraham I struct module *owner) 4795e8cb403SKishon Vijay Abraham I { 4805e8cb403SKishon Vijay Abraham I int ret; 4815e8cb403SKishon Vijay Abraham I struct pci_epc *epc; 4825e8cb403SKishon Vijay Abraham I 4835e8cb403SKishon Vijay Abraham I if (WARN_ON(!dev)) { 4845e8cb403SKishon Vijay Abraham I ret = -EINVAL; 4855e8cb403SKishon Vijay Abraham I goto err_ret; 4865e8cb403SKishon Vijay Abraham I } 4875e8cb403SKishon Vijay Abraham I 4885e8cb403SKishon Vijay Abraham I epc = kzalloc(sizeof(*epc), GFP_KERNEL); 4895e8cb403SKishon Vijay Abraham I if (!epc) { 4905e8cb403SKishon Vijay Abraham I ret = -ENOMEM; 4915e8cb403SKishon Vijay Abraham I goto err_ret; 4925e8cb403SKishon Vijay Abraham I } 4935e8cb403SKishon Vijay Abraham I 4945e8cb403SKishon Vijay Abraham I spin_lock_init(&epc->lock); 4955e8cb403SKishon Vijay Abraham I INIT_LIST_HEAD(&epc->pci_epf); 4965e8cb403SKishon Vijay Abraham I 4975e8cb403SKishon Vijay Abraham I device_initialize(&epc->dev); 4985e8cb403SKishon Vijay Abraham I dma_set_coherent_mask(&epc->dev, dev->coherent_dma_mask); 4995e8cb403SKishon Vijay Abraham I epc->dev.class = pci_epc_class; 5005e8cb403SKishon Vijay Abraham I epc->dev.dma_mask = dev->dma_mask; 5015e8cb403SKishon Vijay Abraham I epc->ops = ops; 5025e8cb403SKishon Vijay Abraham I 5035e8cb403SKishon Vijay Abraham I ret = dev_set_name(&epc->dev, "%s", dev_name(dev)); 5045e8cb403SKishon Vijay Abraham I if (ret) 5055e8cb403SKishon Vijay Abraham I goto put_dev; 5065e8cb403SKishon Vijay Abraham I 5075e8cb403SKishon Vijay Abraham I ret = device_add(&epc->dev); 5085e8cb403SKishon Vijay Abraham I if (ret) 5095e8cb403SKishon Vijay Abraham I goto put_dev; 5105e8cb403SKishon Vijay Abraham I 5115e8cb403SKishon Vijay Abraham I return epc; 5125e8cb403SKishon Vijay Abraham I 5135e8cb403SKishon Vijay Abraham I put_dev: 5145e8cb403SKishon Vijay Abraham I put_device(&epc->dev); 5155e8cb403SKishon Vijay Abraham I kfree(epc); 5165e8cb403SKishon Vijay Abraham I 5175e8cb403SKishon Vijay Abraham I err_ret: 5185e8cb403SKishon Vijay Abraham I return ERR_PTR(ret); 5195e8cb403SKishon Vijay Abraham I } 5205e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(__pci_epc_create); 5215e8cb403SKishon Vijay Abraham I 5225e8cb403SKishon Vijay Abraham I /** 5235e8cb403SKishon Vijay Abraham I * __devm_pci_epc_create() - create a new endpoint controller (EPC) device 5245e8cb403SKishon Vijay Abraham I * @dev: device that is creating the new EPC 5255e8cb403SKishon Vijay Abraham I * @ops: function pointers for performing EPC operations 5265e8cb403SKishon Vijay Abraham I * @owner: the owner of the module that creates the EPC device 5275e8cb403SKishon Vijay Abraham I * 5285e8cb403SKishon Vijay Abraham I * Invoke to create a new EPC device and add it to pci_epc class. 5295e8cb403SKishon Vijay Abraham I * While at that, it also associates the device with the pci_epc using devres. 5305e8cb403SKishon Vijay Abraham I * On driver detach, release function is invoked on the devres data, 5315e8cb403SKishon Vijay Abraham I * then, devres data is freed. 5325e8cb403SKishon Vijay Abraham I */ 5335e8cb403SKishon Vijay Abraham I struct pci_epc * 5345e8cb403SKishon Vijay Abraham I __devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops, 5355e8cb403SKishon Vijay Abraham I struct module *owner) 5365e8cb403SKishon Vijay Abraham I { 5375e8cb403SKishon Vijay Abraham I struct pci_epc **ptr, *epc; 5385e8cb403SKishon Vijay Abraham I 5395e8cb403SKishon Vijay Abraham I ptr = devres_alloc(devm_pci_epc_release, sizeof(*ptr), GFP_KERNEL); 5405e8cb403SKishon Vijay Abraham I if (!ptr) 5415e8cb403SKishon Vijay Abraham I return ERR_PTR(-ENOMEM); 5425e8cb403SKishon Vijay Abraham I 5435e8cb403SKishon Vijay Abraham I epc = __pci_epc_create(dev, ops, owner); 5445e8cb403SKishon Vijay Abraham I if (!IS_ERR(epc)) { 5455e8cb403SKishon Vijay Abraham I *ptr = epc; 5465e8cb403SKishon Vijay Abraham I devres_add(dev, ptr); 5475e8cb403SKishon Vijay Abraham I } else { 5485e8cb403SKishon Vijay Abraham I devres_free(ptr); 5495e8cb403SKishon Vijay Abraham I } 5505e8cb403SKishon Vijay Abraham I 5515e8cb403SKishon Vijay Abraham I return epc; 5525e8cb403SKishon Vijay Abraham I } 5535e8cb403SKishon Vijay Abraham I EXPORT_SYMBOL_GPL(__devm_pci_epc_create); 5545e8cb403SKishon Vijay Abraham I 5555e8cb403SKishon Vijay Abraham I static int __init pci_epc_init(void) 5565e8cb403SKishon Vijay Abraham I { 5575e8cb403SKishon Vijay Abraham I pci_epc_class = class_create(THIS_MODULE, "pci_epc"); 5585e8cb403SKishon Vijay Abraham I if (IS_ERR(pci_epc_class)) { 5595e8cb403SKishon Vijay Abraham I pr_err("failed to create pci epc class --> %ld\n", 5605e8cb403SKishon Vijay Abraham I PTR_ERR(pci_epc_class)); 5615e8cb403SKishon Vijay Abraham I return PTR_ERR(pci_epc_class); 5625e8cb403SKishon Vijay Abraham I } 5635e8cb403SKishon Vijay Abraham I 5645e8cb403SKishon Vijay Abraham I return 0; 5655e8cb403SKishon Vijay Abraham I } 5665e8cb403SKishon Vijay Abraham I module_init(pci_epc_init); 5675e8cb403SKishon Vijay Abraham I 5685e8cb403SKishon Vijay Abraham I static void __exit pci_epc_exit(void) 5695e8cb403SKishon Vijay Abraham I { 5705e8cb403SKishon Vijay Abraham I class_destroy(pci_epc_class); 5715e8cb403SKishon Vijay Abraham I } 5725e8cb403SKishon Vijay Abraham I module_exit(pci_epc_exit); 5735e8cb403SKishon Vijay Abraham I 5745e8cb403SKishon Vijay Abraham I MODULE_DESCRIPTION("PCI EPC Library"); 5755e8cb403SKishon Vijay Abraham I MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>"); 5765e8cb403SKishon Vijay Abraham I MODULE_LICENSE("GPL v2"); 577