forked from mirrors/linux
b884e2de2a
Add a function to unregister a logical PIO range. Logical PIO space can still be leaked when unregistering certain LOGIC_PIO_CPU_MMIO regions, but this acceptable for now since there are no callers to unregister LOGIC_PIO_CPU_MMIO regions, and the logical PIO region allocation scheme would need significant work to improve this. Cc: stable@vger.kernel.org Signed-off-by: John Garry <john.garry@huawei.com> Signed-off-by: Wei Xu <xuwei5@hisilicon.com>
124 lines
3.2 KiB
C
124 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 HiSilicon Limited, All Rights Reserved.
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* Author: Gabriele Paoloni <gabriele.paoloni@huawei.com>
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* Author: Zhichang Yuan <yuanzhichang@hisilicon.com>
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*/
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#ifndef __LINUX_LOGIC_PIO_H
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#define __LINUX_LOGIC_PIO_H
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#include <linux/fwnode.h>
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enum {
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LOGIC_PIO_INDIRECT, /* Indirect IO flag */
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LOGIC_PIO_CPU_MMIO, /* Memory-mapped IO flag */
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};
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struct logic_pio_hwaddr {
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struct list_head list;
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struct fwnode_handle *fwnode;
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resource_size_t hw_start;
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resource_size_t io_start;
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resource_size_t size; /* range size populated */
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unsigned long flags;
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void *hostdata;
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const struct logic_pio_host_ops *ops;
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};
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struct logic_pio_host_ops {
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u32 (*in)(void *hostdata, unsigned long addr, size_t dwidth);
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void (*out)(void *hostdata, unsigned long addr, u32 val,
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size_t dwidth);
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u32 (*ins)(void *hostdata, unsigned long addr, void *buffer,
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size_t dwidth, unsigned int count);
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void (*outs)(void *hostdata, unsigned long addr, const void *buffer,
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size_t dwidth, unsigned int count);
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};
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#ifdef CONFIG_INDIRECT_PIO
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u8 logic_inb(unsigned long addr);
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void logic_outb(u8 value, unsigned long addr);
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void logic_outw(u16 value, unsigned long addr);
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void logic_outl(u32 value, unsigned long addr);
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u16 logic_inw(unsigned long addr);
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u32 logic_inl(unsigned long addr);
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void logic_outb(u8 value, unsigned long addr);
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void logic_outw(u16 value, unsigned long addr);
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void logic_outl(u32 value, unsigned long addr);
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void logic_insb(unsigned long addr, void *buffer, unsigned int count);
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void logic_insl(unsigned long addr, void *buffer, unsigned int count);
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void logic_insw(unsigned long addr, void *buffer, unsigned int count);
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void logic_outsb(unsigned long addr, const void *buffer, unsigned int count);
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void logic_outsw(unsigned long addr, const void *buffer, unsigned int count);
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void logic_outsl(unsigned long addr, const void *buffer, unsigned int count);
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#ifndef inb
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#define inb logic_inb
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#endif
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#ifndef inw
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#define inw logic_inw
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#endif
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#ifndef inl
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#define inl logic_inl
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#endif
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#ifndef outb
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#define outb logic_outb
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#endif
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#ifndef outw
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#define outw logic_outw
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#endif
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#ifndef outl
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#define outl logic_outl
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#endif
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#ifndef insb
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#define insb logic_insb
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#endif
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#ifndef insw
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#define insw logic_insw
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#endif
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#ifndef insl
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#define insl logic_insl
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#endif
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#ifndef outsb
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#define outsb logic_outsb
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#endif
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#ifndef outsw
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#define outsw logic_outsw
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#endif
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#ifndef outsl
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#define outsl logic_outsl
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#endif
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/*
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* We reserve 0x4000 bytes for Indirect IO as so far this library is only
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* used by the HiSilicon LPC Host. If needed, we can reserve a wider IO
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* area by redefining the macro below.
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*/
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#define PIO_INDIRECT_SIZE 0x4000
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#define MMIO_UPPER_LIMIT (IO_SPACE_LIMIT - PIO_INDIRECT_SIZE)
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#else
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#define MMIO_UPPER_LIMIT IO_SPACE_LIMIT
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#endif /* CONFIG_INDIRECT_PIO */
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struct logic_pio_hwaddr *find_io_range_by_fwnode(struct fwnode_handle *fwnode);
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unsigned long logic_pio_trans_hwaddr(struct fwnode_handle *fwnode,
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resource_size_t hw_addr, resource_size_t size);
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int logic_pio_register_range(struct logic_pio_hwaddr *newrange);
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void logic_pio_unregister_range(struct logic_pio_hwaddr *range);
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resource_size_t logic_pio_to_hwaddr(unsigned long pio);
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unsigned long logic_pio_trans_cpuaddr(resource_size_t hw_addr);
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#endif /* __LINUX_LOGIC_PIO_H */
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