diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/Makefile | 2 | ||||
| -rw-r--r-- | drivers/pci/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/pci/endpoint/Kconfig | 20 | ||||
| -rw-r--r-- | drivers/pci/endpoint/Makefile | 6 | ||||
| -rw-r--r-- | drivers/pci/endpoint/pci-epc-core.c | 576 | ||||
| -rw-r--r-- | drivers/pci/endpoint/pci-epc-mem.c | 143 | ||||
| -rw-r--r-- | drivers/pci/endpoint/pci-epf-core.c | 355 |
7 files changed, 1103 insertions, 0 deletions
diff --git a/drivers/Makefile b/drivers/Makefile index 2eced9afba53..a5f8e43b2c4d 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -14,7 +14,9 @@ obj-$(CONFIG_GENERIC_PHY) += phy/ obj-$(CONFIG_PINCTRL) += pinctrl/ obj-$(CONFIG_GPIOLIB) += gpio/ obj-y += pwm/ + obj-$(CONFIG_PCI) += pci/ +obj-$(CONFIG_PCI_ENDPOINT) += pci/endpoint/ # PCI dwc controller drivers obj-y += pci/dwc/ diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index df141420c902..9747c1ec8c74 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig @@ -134,3 +134,4 @@ config PCI_HYPERV source "drivers/pci/hotplug/Kconfig" source "drivers/pci/dwc/Kconfig" source "drivers/pci/host/Kconfig" +source "drivers/pci/endpoint/Kconfig" diff --git a/drivers/pci/endpoint/Kconfig b/drivers/pci/endpoint/Kconfig new file mode 100644 index 000000000000..a5442ace7077 --- /dev/null +++ b/drivers/pci/endpoint/Kconfig @@ -0,0 +1,20 @@ +# +# PCI Endpoint Support +# + +menu "PCI Endpoint" + +config PCI_ENDPOINT + bool "PCI Endpoint Support" + help + Enable this configuration option to support configurable PCI + endpoint. This should be enabled if the platform has a PCI + controller that can operate in endpoint mode. + + Enabling this option will build the endpoint library, which + includes endpoint controller library and endpoint function + library. + + If in doubt, say "N" to disable Endpoint support. + +endmenu diff --git a/drivers/pci/endpoint/Makefile b/drivers/pci/endpoint/Makefile new file mode 100644 index 000000000000..dc1bc16491e6 --- /dev/null +++ b/drivers/pci/endpoint/Makefile @@ -0,0 +1,6 @@ +# +# Makefile for PCI Endpoint Support +# + +obj-$(CONFIG_PCI_ENDPOINT) += pci-epc-core.o pci-epf-core.o\ + pci-epc-mem.o diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c new file mode 100644 index 000000000000..7c71dd94721c --- /dev/null +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -0,0 +1,576 @@ +/** + * PCI Endpoint *Controller* (EPC) library + * + * Copyright (C) 2017 Texas Instruments + * Author: Kishon Vijay Abraham I <kishon@ti.com> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 of + * the License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/slab.h> +#include <linux/module.h> + +#include <linux/pci-epc.h> +#include <linux/pci-epf.h> + +static struct class *pci_epc_class; + +static void devm_pci_epc_release(struct device *dev, void *res) +{ + struct pci_epc *epc = *(struct pci_epc **)res; + + pci_epc_destroy(epc); +} + +static int devm_pci_epc_match(struct device *dev, void *res, void *match_data) +{ + struct pci_epc **epc = res; + + return *epc == match_data; +} + +/** + * pci_epc_put() - release the PCI endpoint controller + * @epc: epc returned by pci_epc_get() + * + * release the refcount the caller obtained by invoking pci_epc_get() + */ +void pci_epc_put(struct pci_epc *epc) +{ + if (!epc || IS_ERR(epc)) + return; + + module_put(epc->ops->owner); + put_device(&epc->dev); +} +EXPORT_SYMBOL_GPL(pci_epc_put); + +/** + * pci_epc_get() - get the PCI endpoint controller + * @epc_name: device name of the endpoint controller + * + * Invoke to get struct pci_epc * corresponding to the device name of the + * endpoint controller + */ +struct pci_epc *pci_epc_get(const char *epc_name) +{ + int ret = -EINVAL; + struct pci_epc *epc; + struct device *dev; + struct class_dev_iter iter; + + class_dev_iter_init(&iter, pci_epc_class, NULL, NULL); + while ((dev = class_dev_iter_next(&iter))) { + if (strcmp(epc_name, dev_name(dev))) + continue; + + epc = to_pci_epc(dev); + if (!try_module_get(epc->ops->owner)) { + ret = -EINVAL; + goto err; + } + + class_dev_iter_exit(&iter); + get_device(&epc->dev); + return epc; + } + +err: + class_dev_iter_exit(&iter); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(pci_epc_get); + +/** + * pci_epc_stop() - stop the PCI link + * @epc: the link of the EPC device that has to be stopped + * + * Invoke to stop the PCI link + */ +void pci_epc_stop(struct pci_epc *epc) +{ + unsigned long flags; + + if (IS_ERR(epc) || !epc->ops->stop) + return; + + spin_lock_irqsave(&epc->lock, flags); + epc->ops->stop(epc); + spin_unlock_irqrestore(&epc->lock, flags); +} +EXPORT_SYMBOL_GPL(pci_epc_stop); + +/** + * pci_epc_start() - start the PCI link + * @epc: the link of *this* EPC device has to be started + * + * Invoke to start the PCI link + */ +int pci_epc_start(struct pci_epc *epc) +{ + int ret; + unsigned long flags; + + if (IS_ERR(epc)) + return -EINVAL; + + if (!epc->ops->start) + return 0; + + spin_lock_irqsave(&epc->lock, flags); + ret = epc->ops->start(epc); + spin_unlock_irqrestore(&epc->lock, flags); + + return ret; +} +EXPORT_SYMBOL_GPL(pci_epc_start); + +/** + * pci_epc_raise_irq() - interrupt the host system + * @epc: the EPC device which has to interrupt the host + * @type: specify the type of interrupt; legacy or MSI + * @interrupt_num: the MSI interrupt number + * + * Invoke to raise an MSI or legacy interrupt + */ +int pci_epc_raise_irq(struct pci_epc *epc, enum pci_epc_irq_type type, + u8 interrupt_num) +{ + int ret; + unsigned long flags; + + if (IS_ERR(epc)) + return -EINVAL; + + if (!epc->ops->raise_irq) + return 0; + + spin_lock_irqsave(&epc->lock, flags); + ret = epc->ops->raise_irq(epc, type, interrupt_num); + spin_unlock_irqrestore(&epc->lock, flags); + + return ret; +} +EXPORT_SYMBOL_GPL(pci_epc_raise_irq); + +/** + * pci_epc_get_msi() - get the number of MSI interrupt numbers allocated + * @epc: the EPC device to which MSI interrupts was requested + * + * Invoke to get the number of MSI interrupts allocated by the RC + */ +int pci_epc_get_msi(struct pci_epc *epc) +{ + int interrupt; + unsigned long flags; + + if (IS_ERR(epc)) + return 0; + + if (!epc->ops->get_msi) + return 0; + + spin_lock_irqsave(&epc->lock, flags); + interrupt = epc->ops->get_msi(epc); + spin_unlock_irqrestore(&epc->lock, flags); + + if (interrupt < 0) + return 0; + + interrupt = 1 << interrupt; + + return interrupt; +} +EXPORT_SYMBOL_GPL(pci_epc_get_msi); + +/** + * pci_epc_set_msi() - set the number of MSI interrupt numbers required + * @epc: the EPC device on which MSI has to be configured + * @interrupts: number of MSI interrupts required by the EPF + * + * Invoke to set the required number of MSI interrupts. + */ +int pci_epc_set_msi(struct pci_epc *epc, u8 interrupts) +{ + int ret; + u8 encode_int; + unsigned long flags; + + if (IS_ERR(epc)) + return -EINVAL; + + if (!epc->ops->set_msi) + return 0; + + encode_int = order_base_2(interrupts); + + spin_lock_irqsave(&epc->lock, flags); + ret = epc->ops->set_msi(epc, encode_int); + spin_unlock_irqrestore(&epc->lock, flags); + + return ret; +} +EXPORT_SYMBOL_GPL(pci_epc_set_msi); + +/** + * pci_epc_unmap_addr() - unmap CPU address from PCI address + * @epc: the EPC device on which address is allocated + * @phys_addr: physical address of the local system + * + * Invoke to unmap the CPU address from PCI address. + */ +void pci_epc_unmap_addr(struct pci_epc *epc, phys_addr_t phys_addr) +{ + unsigned long flags; + + if (IS_ERR(epc)) + return; + + if (!epc->ops->unmap_addr) + return; + + spin_lock_irqsave(&epc->lock, flags); + epc->ops->unmap_addr(epc, phys_addr); + spin_unlock_irqrestore(&epc->lock, flags); +} +EXPORT_SYMBOL_GPL(pci_epc_unmap_addr); + +/** + * pci_epc_map_addr() - map CPU address to PCI address + * @epc: the EPC device on which address is allocated + * @phys_addr: physical address of the local system + * @pci_addr: PCI address to which the physical address should be mapped + * @size: the size of the allocation + * + * Invoke to map CPU address with PCI address. + */ +int pci_epc_map_addr(struct pci_epc *epc, phys_addr_t phys_addr, + u64 pci_addr, size_t size) +{ + int ret; + unsigned long flags; + + if (IS_ERR(epc)) + return -EINVAL; + + if (!epc->ops->map_addr) + return 0; + + spin_lock_irqsave(&epc->lock, flags); + ret = epc->ops->map_addr(epc, phys_addr, pci_addr, size); + spin_unlock_irqrestore(&epc->lock, flags); + + return ret; +} +EXPORT_SYMBOL_GPL(pci_epc_map_addr); + +/** + * pci_epc_clear_bar() - reset the BAR + * @epc: the EPC device for which the BAR has to be cleared + * @bar: the BAR number that has to be reset + * + * Invoke to reset the BAR of the endpoint device. + */ +void pci_epc_clear_bar(struct pci_epc *epc, int bar) +{ + unsigned long flags; + + if (IS_ERR(epc)) + return; + + if (!epc->ops->clear_bar) + return; + + spin_lock_irqsave(&epc->lock, flags); + epc->ops->clear_bar(epc, bar); + spin_unlock_irqrestore(&epc->lock, flags); +} +EXPORT_SYMBOL_GPL(pci_epc_clear_bar); + +/** + * pci_epc_set_bar() - configure BAR in order for host to assign PCI addr space + * @epc: the EPC device on which BAR has to be configured + * @bar: the BAR number that has to be configured + * @size: the size of the addr space + * @flags: specify memory allocation/io allocation/32bit address/64 bit address + * + * Invoke to configure the BAR of the endpoint device. + */ +int pci_epc_set_bar(struct pci_epc *epc, enum pci_barno bar, + dma_addr_t bar_phys, size_t size, int flags) +{ + int ret; + unsigned long irq_flags; + + if (IS_ERR(epc)) + return -EINVAL; + + if (!epc->ops->set_bar) + return 0; + + spin_lock_irqsave(&epc->lock, irq_flags); + ret = epc->ops->set_bar(epc, bar, bar_phys, size, flags); + spin_unlock_irqrestore(&epc->lock, irq_flags); + + return ret; +} +EXPORT_SYMBOL_GPL(pci_epc_set_bar); + +/** + * pci_epc_write_header() - write standard configuration header + * @epc: the EPC device to which the configuration header should be written + * @header: standard configuration header fields + * + * Invoke to write the configuration header to the endpoint controller. Every + * endpoint controller will have a dedicated location to which the standard + * configuration header would be written. The callback function should write + * the header fields to this dedicated location. + */ +int pci_epc_write_header(struct pci_epc *epc, struct pci_epf_header *header) +{ + int ret; + unsigned long flags; + + if (IS_ERR(epc)) + return -EINVAL; + + if (!epc->ops->write_header) + return 0; + + spin_lock_irqsave(&epc->lock, flags); + ret = epc->ops->write_header(epc, header); + spin_unlock_irqrestore(&epc->lock, flags); + + return ret; +} +EXPORT_SYMBOL_GPL(pci_epc_write_header); + +/** + * pci_epc_add_epf() - bind PCI endpoint function to an endpoint controller + * @epc: the EPC device to which the endpoint function should be added + * @epf: the endpoint function to be added + * + * A PCI endpoint device can have one or more functions. In the case of PCIe, + * the specification allows up to 8 PCIe endpoint functions. Invoke + * pci_epc_add_epf() to add a PCI endpoint function to an endpoint controller. + */ +int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf) +{ + unsigned long flags; + + if (epf->epc) + return -EBUSY; + + if (IS_ERR(epc)) + return -EINVAL; + + if (epf->func_no > epc->max_functions - 1) + return -EINVAL; + + epf->epc = epc; + dma_set_coherent_mask(&epf->dev, epc->dev.coherent_dma_mask); + epf->dev.dma_mask = epc->dev.dma_mask; + + spin_lock_irqsave(&epc->lock, flags); + list_add_tail(&epf->list, &epc->pci_epf); + spin_unlock_irqrestore(&epc->lock, flags); + + return 0; +} +EXPORT_SYMBOL_GPL(pci_epc_add_epf); + +/** + * pci_epc_remove_epf() - remove PCI endpoint function from endpoint controller + * @epc: the EPC device from which the endpoint function should be removed + * @epf: the endpoint function to be removed + * + * Invoke to remove PCI endpoint function from the endpoint controller. + */ +void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf) +{ + unsigned long flags; + + if (!epc || IS_ERR(epc)) + return; + + spin_lock_irqsave(&epc->lock, flags); + list_del(&epf->list); + spin_unlock_irqrestore(&epc->lock, flags); +} +EXPORT_SYMBOL_GPL(pci_epc_remove_epf); + +/** + * pci_epc_linkup() - Notify the EPF device that EPC device has established a + * connection with the Root Complex. + * @epc: the EPC device which has established link with the host + * + * Invoke to Notify the EPF device that the EPC device has established a + * connection with the Root Complex. + */ +void pci_epc_linkup(struct pci_epc *epc) +{ + unsigned long flags; + struct pci_epf *epf; + + if (!epc || IS_ERR(epc)) + return; + + spin_lock_irqsave(&epc->lock, flags); + list_for_each_entry(epf, &epc->pci_epf, list) + pci_epf_linkup(epf); + spin_unlock_irqrestore(&epc->lock, flags); +} +EXPORT_SYMBOL_GPL(pci_epc_linkup); + +/** + * pci_epc_destroy() - destroy the EPC device + * @epc: the EPC device that has to be destroyed + * + * Invoke to destroy the PCI EPC device + */ +void pci_epc_destroy(struct pci_epc *epc) +{ + device_unregister(&epc->dev); + kfree(epc); +} +EXPORT_SYMBOL_GPL(pci_epc_destroy); + +/** + * devm_pci_epc_destroy() - destroy the EPC device + * @dev: device that wants to destroy the EPC + * @epc: the EPC device that has to be destroyed + * + * Invoke to destroy the devres associated with this + * pci_epc and destroy the EPC device. + */ +void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc) +{ + int r; + + r = devres_destroy(dev, devm_pci_epc_release, devm_pci_epc_match, + epc); + dev_WARN_ONCE(dev, r, "couldn't find PCI EPC resource\n"); +} +EXPORT_SYMBOL_GPL(devm_pci_epc_destroy); + +/** + * __pci_epc_create() - create a new endpoint controller (EPC) device + * @dev: device that is creating the new EPC + * @ops: function pointers for performing EPC operations + * @owner: the owner of the module that creates the EPC device + * + * Invoke to create a new EPC device and add it to pci_epc class. + */ +struct pci_epc * +__pci_epc_create(struct device *dev, const struct pci_epc_ops *ops, + struct module *owner) +{ + int ret; + struct pci_epc *epc; + + if (WARN_ON(!dev)) { + ret = -EINVAL; + goto err_ret; + } + + epc = kzalloc(sizeof(*epc), GFP_KERNEL); + if (!epc) { + ret = -ENOMEM; + goto err_ret; + } + + spin_lock_init(&epc->lock); + INIT_LIST_HEAD(&epc->pci_epf); + + device_initialize(&epc->dev); + dma_set_coherent_mask(&epc->dev, dev->coherent_dma_mask); + epc->dev.class = pci_epc_class; + epc->dev.dma_mask = dev->dma_mask; + epc->ops = ops; + + ret = dev_set_name(&epc->dev, "%s", dev_name(dev)); + if (ret) + goto put_dev; + + ret = device_add(&epc->dev); + if (ret) + goto put_dev; + + return epc; + +put_dev: + put_device(&epc->dev); + kfree(epc); + +err_ret: + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(__pci_epc_create); + +/** + * __devm_pci_epc_create() - create a new endpoint controller (EPC) device + * @dev: device that is creating the new EPC + * @ops: function pointers for performing EPC operations + * @owner: the owner of the module that creates the EPC device + * + * Invoke to create a new EPC device and add it to pci_epc class. + * While at that, it also associates the device with the pci_epc using devres. + * On driver detach, release function is invoked on the devres data, + * then, devres data is freed. + */ +struct pci_epc * +__devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops, + struct module *owner) +{ + struct pci_epc **ptr, *epc; + + ptr = devres_alloc(devm_pci_epc_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + epc = __pci_epc_create(dev, ops, owner); + if (!IS_ERR(epc)) { + *ptr = epc; + devres_add(dev, ptr); + } else { + devres_free(ptr); + } + + return epc; +} +EXPORT_SYMBOL_GPL(__devm_pci_epc_create); + +static int __init pci_epc_init(void) +{ + pci_epc_class = class_create(THIS_MODULE, "pci_epc"); + if (IS_ERR(pci_epc_class)) { + pr_err("failed to create pci epc class --> %ld\n", + PTR_ERR(pci_epc_class)); + return PTR_ERR(pci_epc_class); + } + + return 0; +} +module_init(pci_epc_init); + +static void __exit pci_epc_exit(void) +{ + class_destroy(pci_epc_class); +} +module_exit(pci_epc_exit); + +MODULE_DESCRIPTION("PCI EPC Library"); +MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/pci/endpoint/pci-epc-mem.c b/drivers/pci/endpoint/pci-epc-mem.c new file mode 100644 index 000000000000..3a94cc1caf22 --- /dev/null +++ b/drivers/pci/endpoint/pci-epc-mem.c @@ -0,0 +1,143 @@ +/** + * PCI Endpoint *Controller* Address Space Management + * + * Copyright (C) 2017 Texas Instruments + * Author: Kishon Vijay Abraham I <kishon@ti.com> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 of + * the License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/io.h> +#include <linux/module.h> +#include <linux/slab.h> + +#include <linux/pci-epc.h> + +/** + * pci_epc_mem_init() - initialize the pci_epc_mem structure + * @epc: the EPC device that invoked pci_epc_mem_init + * @phys_base: the physical address of the base + * @size: the size of the address space + * + * Invoke to initialize the pci_epc_mem structure used by the + * endpoint functions to allocate mapped PCI address. + */ +int pci_epc_mem_init(struct pci_epc *epc, phys_addr_t phys_base, size_t size) +{ + int ret; + struct pci_epc_mem *mem; + unsigned long *bitmap; + int pages = size >> PAGE_SHIFT; + int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long); + + mem = kzalloc(sizeof(*mem), GFP_KERNEL); + if (!mem) { + ret = -ENOMEM; + goto err; + } + + bitmap = kzalloc(bitmap_size, GFP_KERNEL); + if (!bitmap) { + ret = -ENOMEM; + goto err_mem; + } + + mem->bitmap = bitmap; + mem->phys_base = phys_base; + mem->pages = pages; + mem->size = size; + + epc->mem = mem; + + return 0; + +err_mem: + kfree(mem); + +err: +return ret; +} +EXPORT_SYMBOL_GPL(pci_epc_mem_init); + +/** + * pci_epc_mem_exit() - cleanup the pci_epc_mem structure + * @epc: the EPC device that invoked pci_epc_mem_exit + * + * Invoke to cleanup the pci_epc_mem structure allocated in + * pci_epc_mem_init(). + */ +void pci_epc_mem_exit(struct pci_epc *epc) +{ + struct pci_epc_mem *mem = epc->mem; + + epc->mem = NULL; + kfree(mem->bitmap); + kfree(mem); +} +EXPORT_SYMBOL_GPL(pci_epc_mem_exit); + +/** + * pci_epc_mem_alloc_addr() - allocate memory address from EPC addr space + * @epc: the EPC device on which memory has to be allocated + * @phys_addr: populate the allocated physical address here + * @size: the size of the address space that has to be allocated + * + * Invoke to allocate memory address from the EPC address space. This + * is usually done to map the remote RC address into the local system. + */ +void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc, + phys_addr_t *phys_addr, size_t size) +{ + int pageno; + void __iomem *virt_addr; + struct pci_epc_mem *mem = epc->mem; + int order = get_order(size); + + pageno = bitmap_find_free_region(mem->bitmap, mem->pages, order); + if (pageno < 0) + return NULL; + + *phys_addr = mem->phys_base + (pageno << PAGE_SHIFT); + virt_addr = ioremap(*phys_addr, size); + if (!virt_addr) + bitmap_release_region(mem->bitmap, pageno, order); + + return virt_addr; +} +EXPORT_SYMBOL_GPL(pci_epc_mem_alloc_addr); + +/** + * pci_epc_mem_free_addr() - free the allocated memory address + * @epc: the EPC device on which memory was allocated + * @phys_addr: the allocated physical address + * @virt_addr: virtual address of the allocated mem space + * @size: the size of the allocated address space + * + * Invoke to free the memory allocated using pci_epc_mem_alloc_addr. + */ +void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr, + void __iomem *virt_addr, size_t size) +{ + int pageno; + int order = get_order(size); + struct pci_epc_mem *mem = epc->mem; + + iounmap(virt_addr); + pageno = (phys_addr - mem->phys_base) >> PAGE_SHIFT; + bitmap_release_region(mem->bitmap, pageno, order); +} +EXPORT_SYMBOL_GPL(pci_epc_mem_free_addr); + +MODULE_DESCRIPTION("PCI EPC Address Space Management"); +MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c new file mode 100644 index 000000000000..a281c599a504 --- /dev/null +++ b/drivers/pci/endpoint/pci-epf-core.c @@ -0,0 +1,355 @@ +/** + * PCI Endpoint *Function* (EPF) library + * + * Copyright (C) 2017 Texas Instruments + * Author: Kishon Vijay Abraham I <kishon@ti.com> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 of + * the License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/slab.h> +#include <linux/module.h> + +#include <linux/pci-epc.h> +#include <linux/pci-epf.h> + +static struct bus_type pci_epf_bus_type; +static struct device_type pci_epf_type; + +/** + * pci_epf_linkup() - Notify the function driver that EPC device has + * established a connection with the Root Complex. + * @epf: the EPF device bound to the EPC device which has established + * the connection with the host + * + * Invoke to notify the function driver that EPC device has established + * a connection with the Root Complex. + */ +void pci_epf_linkup(struct pci_epf *epf) +{ + if (!epf->driver) { + dev_WARN(&epf->dev, "epf device not bound to driver\n"); + return; + } + + epf->driver->ops->linkup(epf); +} +EXPORT_SYMBOL_GPL(pci_epf_linkup); + +/** + * pci_epf_unbind() - Notify the function driver that the binding between the + * EPF device and EPC device has been lost + * @epf: the EPF device which has lost the binding with the EPC device + * + * Invoke to notify the function driver that the binding between the EPF device + * and EPC device has been lost. + */ +void pci_epf_unbind(struct pci_epf *epf) +{ + if (!epf->driver) { + dev_WARN(&epf->dev, "epf device not bound to driver\n"); + return; + } + + epf->driver->ops->unbind(epf); + module_put(epf->driver->owner); +} +EXPORT_SYMBOL_GPL(pci_epf_unbind); + +/** + * pci_epf_bind() - Notify the function driver that the EPF device has been + * bound to a EPC device + * @epf: the EPF device which has been bound to the EPC device + * + * Invoke to notify the function driver that it has been bound to a EPC device + */ +int pci_epf_bind(struct pci_epf *epf) +{ + if (!epf->driver) { + dev_WARN(&epf->dev, "epf device not bound to driver\n"); + return -EINVAL; + } + + if (!try_module_get(epf->driver->owner)) + return -EAGAIN; + + return epf->driver->ops->bind(epf); +} +EXPORT_SYMBOL_GPL(pci_epf_bind); + +/** + * pci_epf_free_space() - free the allocated PCI EPF register space + * @addr: the virtual address of the PCI EPF register space + * @bar: the BAR number corresponding to the register space + * + * Invoke to free the allocated PCI EPF register space. + */ +void pci_epf_free_space(struct pci_epf *epf, void *addr, enum pci_barno bar) +{ + struct device *dev = &epf->dev; + + if (!addr) + return; + + dma_free_coherent(dev, epf->bar[bar].size, addr, + epf->bar[bar].phys_addr); + + epf->bar[bar].phys_addr = 0; + epf->bar[bar].size = 0; +} +EXPORT_SYMBOL_GPL(pci_epf_free_space); + +/** + * pci_epf_alloc_space() - allocate memory for the PCI EPF register space + * @size: the size of the memory that has to be allocated + * @bar: the BAR number corresponding to the allocated register space + * + * Invoke to allocate memory for the PCI EPF register space. + */ +void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar) +{ + void *space; + struct device *dev = &epf->dev; + dma_addr_t phys_addr; + + if (size < 128) + size = 128; + size = roundup_pow_of_two(size); + + space = dma_alloc_coherent(dev, size, &phys_addr, GFP_KERNEL); + if (!space) { + dev_err(dev, "failed to allocate mem space\n"); + return NULL; + } + + epf->bar[bar].phys_addr = phys_addr; + epf->bar[bar].size = size; + + return space; +} +EXPORT_SYMBOL_GPL(pci_epf_alloc_space); + +/** + * pci_epf_unregister_driver() - unregister the PCI EPF driver + * @driver: the PCI EPF driver that has to be unregistered + * + * Invoke to unregister the PCI EPF driver. + */ +void pci_epf_unregister_driver(struct pci_epf_driver *driver) +{ + driver_unregister(&driver->driver); +} +EXPORT_SYMBOL_GPL(pci_epf_unregister_driver); + +/** + * __pci_epf_register_driver() - register a new PCI EPF driver + * @driver: structure representing PCI EPF driver + * @owner: the owner of the module that registers the PCI EPF driver + * + * Invoke to register a new PCI EPF driver. + */ +int __pci_epf_register_driver(struct pci_epf_driver *driver, + struct module *owner) +{ + int ret; + + if (!driver->ops) + return -EINVAL; + + if (!driver->ops->bind || !driver->ops->unbind || !driver->ops->linkup) + return -EINVAL; + + driver->driver.bus = &pci_epf_bus_type; + driver->driver.owner = owner; + + ret = driver_register(&driver->driver); + if (ret) + return ret; + + return 0; +} +EXPORT_SYMBOL_GPL(__pci_epf_register_driver); + +/** + * pci_epf_destroy() - destroy the created PCI EPF device + * @epf: the PCI EPF device that has to be destroyed. + * + * Invoke to destroy the PCI EPF device created by invoking pci_epf_create(). + */ +void pci_epf_destroy(struct pci_epf *epf) +{ + device_unregister(&epf->dev); +} +EXPORT_SYMBOL_GPL(pci_epf_destroy); + +/** + * pci_epf_create() - create a new PCI EPF device + * @name: the name of the PCI EPF device. This name will be used to bind the + * the EPF device to a EPF driver + * + * Invoke to create a new PCI EPF device by providing the name of the function + * device. + */ +struct pci_epf *pci_epf_create(const char *name) +{ + int ret; + struct pci_epf *epf; + struct device *dev; + char *func_name; + char *buf; + + epf = kzalloc(sizeof(*epf), GFP_KERNEL); + if (!epf) { + ret = -ENOMEM; + goto err_ret; + } + + buf = kstrdup(name, GFP_KERNEL); + if (!buf) { + ret = -ENOMEM; + goto free_epf; + } + + func_name = buf; + buf = strchrnul(buf, '.'); + *buf = '\0'; + + epf->name = kstrdup(func_name, GFP_KERNEL); + if (!epf->name) { + ret = -ENOMEM; + goto free_func_name; + } + + dev = &epf->dev; + device_initialize(dev); + dev->bus = &pci_epf_bus_type; + dev->type = &pci_epf_type; + + ret = dev_set_name(dev, "%s", name); + if (ret) + goto put_dev; + + ret = device_add(dev); + if (ret) + goto put_dev; + + kfree(func_name); + return epf; + +put_dev: + put_device(dev); + kfree(epf->name); + +free_func_name: + kfree(func_name); + +free_epf: + kfree(epf); + +err_ret: + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(pci_epf_create); + +static void pci_epf_dev_release(struct device *dev) +{ + struct pci_epf *epf = to_pci_epf(dev); + + kfree(epf->name); + kfree(epf); +} + +static struct device_type pci_epf_type = { + .release = pci_epf_dev_release, +}; + +static int +pci_epf_match_id(const struct pci_epf_device_id *id, const struct pci_epf *epf) +{ + while (id->name[0]) { + if (strcmp(epf->name, id->name) == 0) + return true; + id++; + } + + return false; +} + +static int pci_epf_device_match(struct device *dev, struct device_driver *drv) +{ + struct pci_epf *epf = to_pci_epf(dev); + struct pci_epf_driver *driver = to_pci_epf_driver(drv); + + if (driver->id_table) + return pci_epf_match_id(driver->id_table, epf); + + return !strcmp(epf->name, drv->name); +} + +static int pci_epf_device_probe(struct device *dev) +{ + struct pci_epf *epf = to_pci_epf(dev); + struct pci_epf_driver *driver = to_pci_epf_driver(dev->driver); + + if (!driver->probe) + return -ENODEV; + + epf->driver = driver; + + return driver->probe(epf); +} + +static int pci_epf_device_remove(struct device *dev) +{ + int ret; + struct pci_epf *epf = to_pci_epf(dev); + struct pci_epf_driver *driver = to_pci_epf_driver(dev->driver); + + ret = driver->remove(epf); + epf->driver = NULL; + + return ret; +} + +static struct bus_type pci_epf_bus_type = { + .name = "pci-epf", + .match = pci_epf_device_match, + .probe = pci_epf_device_probe, + .remove = pci_epf_device_remove, +}; + +static int __init pci_epf_init(void) +{ + int ret; + + ret = bus_register(&pci_epf_bus_type); + if (ret) { + pr_err("failed to register pci epf bus --> %d\n", ret); + return ret; + } + + return 0; +} +module_init(pci_epf_init); + +static void __exit pci_epf_exit(void) +{ + bus_unregister(&pci_epf_bus_type); +} +module_exit(pci_epf_exit); + +MODULE_DESCRIPTION("PCI EPF Library"); +MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>"); +MODULE_LICENSE("GPL v2"); |