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/* SPDX-License-Identifier: GPL-2.0+ */
#ifndef _FDMA_PCI_H_
#define _FDMA_PCI_H_
#include <linux/align.h>
#include <linux/bits.h>
#include <linux/mutex.h>
#include <linux/types.h>
#define FDMA_PCI_ATU_REGION_MAX 6
/* Outbound regions are 64KB granular (datasheet section 3.24.7.4.1), so both
* the region base and the mapped size must be aligned to this.
*/
#define FDMA_PCI_ATU_REGION_ALIGN BIT(16)
#define FDMA_PCI_DB_ALIGN 128
#define FDMA_PCI_DB_SIZE(mtu) ALIGN(mtu, FDMA_PCI_DB_ALIGN)
struct fdma_pci_atu;
struct fdma_pci_atu_region {
struct fdma_pci_atu *atu;
u64 base_addr; /* Base addr of the OB window */
u64 limit_addr; /* End addr of the active mapping (base_addr + size - 1) */
u64 target_addr; /* Host DMA address this region maps to */
int idx;
bool in_use;
};
struct fdma_pci_atu {
void __iomem *addr;
struct mutex lock; /* Protects region alloc/free and ATU register access */
struct fdma_pci_atu_region regions[FDMA_PCI_ATU_REGION_MAX];
};
/* Initialize ATU, dividing OB space into regions. */
void fdma_pci_atu_init(struct fdma_pci_atu *atu, void __iomem *addr);
/* Unmap an ATU region, clearing its translation and disabling it. */
void fdma_pci_atu_region_unmap(struct fdma_pci_atu_region *region);
/* Map a host DMA address into a free ATU region. target_addr and size must be
* FDMA_PCI_ATU_REGION_ALIGN aligned; a misaligned target_addr returns -EINVAL.
*/
struct fdma_pci_atu_region *fdma_pci_atu_region_map(struct fdma_pci_atu *atu,
u64 target_addr,
int size);
/* Translate a host DMA address to the OB address space. Reads the region
* unlocked, so the caller must quiesce DMA and the descriptor paths before
* unmapping the region.
*/
u64 fdma_pci_atu_translate_addr(struct fdma_pci_atu_region *region, u64 addr);
#endif
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