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/**
* 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/of_device.h>
#include <linux/pci-epc.h>
#include <linux/pci-epf.h>
#include <linux/pci-ep-cfs.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
* @func_no: the endpoint function number in the EPC device
* @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, u8 func_no,
enum pci_epc_irq_type type, u8 interrupt_num)
{
int ret;
unsigned long flags;
if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
return -EINVAL;
if (!epc->ops->raise_irq)
return 0;
spin_lock_irqsave(&epc->lock, flags);
ret = epc->ops->raise_irq(epc, func_no, 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
* @func_no: the endpoint function number in the EPC device
*
* Invoke to get the number of MSI interrupts allocated by the RC
*/
int pci_epc_get_msi(struct pci_epc *epc, u8 func_no)
{
int interrupt;
unsigned long flags;
if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
return 0;
if (!epc->ops->get_msi)
return 0;
spin_lock_irqsave(&epc->lock, flags);
interrupt = epc->ops->get_msi(epc, func_no);
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
* @func_no: the endpoint function number in the EPC device
* @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 func_no, u8 interrupts)
{
int ret;
u8 encode_int;
unsigned long flags;
if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
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, func_no, 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
* @func_no: the endpoint function number in the EPC device
* @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, u8 func_no,
phys_addr_t phys_addr)
{
unsigned long flags;
if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
return;
if (!epc->ops->unmap_addr)
return;
spin_lock_irqsave(&epc->lock, flags);
epc->ops->unmap_addr(epc, func_no, 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
* @func_no: the endpoint function number in the EPC device
* @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, u8 func_no,
phys_addr_t phys_addr, u64 pci_addr, size_t size)
{
int ret;
unsigned long flags;
if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
return -EINVAL;
if (!epc->ops->map_addr)
return 0;
spin_lock_irqsave(&epc->lock, flags);
ret = epc->ops->map_addr(epc, func_no, phys_addr, pci_addr, size);
spin_unlock_irqrestore(
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