pcie: endpoint: Introduce API to achieve PCIe data transfer
Introduce common API to achieve data transfer using memcpy to/from outbound region of PCIe EP. Signed-off-by: Abhishek Shah <abhishek.shah@broadcom.com>
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3 changed files with 128 additions and 0 deletions
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# SPDX-License-Identifier: Apache-2.0
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zephyr_sources(pcie_ep_common.c)
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110
drivers/pcie/endpoint/pcie_ep_common.c
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110
drivers/pcie/endpoint/pcie_ep_common.c
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/*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Copyright 2020 Broadcom
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*
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*/
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#include <drivers/pcie/endpoint/pcie_ep.h>
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#include <string.h>
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#include <sys/util.h>
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static int pcie_ep_mapped_copy(uint64_t mapped_addr, uintptr_t local_addr,
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const uint32_t size,
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const enum xfer_direction dir)
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{
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/*
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* Make sure that address can be generated by core, this condition
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* would not hit if proper pcie_ob_mem_type is passed by core
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*/
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if ((!IS_ENABLED(CONFIG_64BIT)) && (mapped_addr >> 32)) {
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return -EINVAL;
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}
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if (dir == DEVICE_TO_HOST) {
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memcpy(UINT_TO_POINTER(mapped_addr),
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UINT_TO_POINTER(local_addr), size);
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} else {
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memcpy(UINT_TO_POINTER(local_addr),
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UINT_TO_POINTER(mapped_addr), size);
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}
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return 0;
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}
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/*
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* Helper API to achieve data transfer with memcpy operation
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* through PCIe outbound memory
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*/
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int pcie_ep_xfer_data_memcpy(struct device *dev, uint64_t pcie_addr,
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uintptr_t *local_addr, uint32_t size,
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enum pcie_ob_mem_type ob_mem_type,
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enum xfer_direction dir)
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{
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uint64_t mapped_addr;
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int mapped_size, ret;
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uint32_t xfer_size, unmapped_size;
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mapped_size = pcie_ep_map_addr(dev, pcie_addr, &mapped_addr,
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size, ob_mem_type);
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/* Check if outbound memory mapping succeeded */
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if (mapped_size < 0) {
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return mapped_size;
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}
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ret = pcie_ep_mapped_copy(mapped_addr, (uintptr_t)local_addr,
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mapped_size, dir);
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pcie_ep_unmap_addr(dev, mapped_addr);
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/* Check if mapped_copy succeeded */
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if (ret < 0) {
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return ret;
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}
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/* Check if we achieved data transfer for given size */
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if (mapped_size == size) {
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return 0;
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}
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/*
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* In normal case, we are done with data transfer by now,
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* but some PCIe address translation hardware requires us to
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* align Host address to be mapped to the translation window size.
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* So, even though translation window size is good enough for
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* size of Host buffer, we may not be able to map entire Host buffer
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* to given outbound window in one time, and we may need to map
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* ramaining size and complete remaining data transfer
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*/
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xfer_size = mapped_size; /* save already tranferred data size */
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unmapped_size = size - mapped_size;
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mapped_size = pcie_ep_map_addr(dev, pcie_addr + xfer_size,
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&mapped_addr, unmapped_size,
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ob_mem_type);
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/* Check if outbound memory mapping succeeded */
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if (mapped_size < 0) {
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return mapped_size;
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}
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ret = pcie_ep_mapped_copy(mapped_addr,
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((uintptr_t)local_addr) + xfer_size,
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mapped_size, dir);
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pcie_ep_unmap_addr(dev, mapped_addr);
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/* Check if mapped_copy succeeded */
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if (ret < 0) {
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return ret;
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}
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/* In second attempt, we must have completed data transfer */
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if (mapped_size != unmapped_size) {
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return -EIO;
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}
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return 0;
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}
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@ -30,6 +30,11 @@ enum pci_ep_irq_type {
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PCIE_EP_IRQ_MSIX, /**< Raise MSIX interrupt */
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};
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enum xfer_direction {
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HOST_TO_DEVICE, /**< Read from Host */
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DEVICE_TO_HOST, /**< Write to Host */
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};
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struct pcie_ep_driver_api {
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int (*conf_read)(struct device *dev, uint32_t offset, uint32_t *data);
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void (*conf_write)(struct device *dev, uint32_t offset, uint32_t data);
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@ -160,4 +165,15 @@ static inline int pcie_ep_raise_irq(struct device *dev,
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return api->raise_irq(dev, irq_type, irq_num);
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}
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/**
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* @brief Data transfer using memcpy
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*
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* @details Helper API to achieve data transfer with memcpy
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* through PCIe outbound memory
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*/
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int pcie_ep_xfer_data_memcpy(struct device *dev, uint64_t pcie_addr,
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uintptr_t *local_addr, uint32_t size,
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enum pcie_ob_mem_type ob_mem_type,
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enum xfer_direction dir);
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#endif /* ZEPHYR_INCLUDE_DRIVERS_PCIE_EP_H_ */
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