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031e360186
41f8bba7f5 ("of/pci: Add pci_register_io_range() and
pci_pio_to_address()") added support for PCI I/O space mapped into CPU
physical memory space. With that support, the I/O ranges configured for
PCI/PCIe hosts on some architectures can be mapped to logical PIO and
converted easily between CPU address and the corresponding logical PIO.
Based on this, PCI I/O port space can be accessed via in/out accessors that
use memory read/write.
But on some platforms, there are bus hosts that access I/O port space with
host-local I/O port addresses rather than memory addresses.
Add a more generic I/O mapping method to support those devices. With this
patch, both the CPU addresses and the host-local port can be mapped into
the logical PIO space with different logical/fake PIOs. After this, all
the I/O accesses to either PCI MMIO devices or host-local I/O peripherals
can be unified into the existing I/O accessors defined in asm-generic/io.h
and be redirected to the right device-specific hooks based on the input
logical PIO.
Tested-by: dann frazier <dann.frazier@canonical.com>
Signed-off-by: Zhichang Yuan <yuanzhichang@hisilicon.com>
Signed-off-by: Gabriele Paoloni <gabriele.paoloni@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
[bhelgaas: remove -EFAULT return from logic_pio_register_range() per
https://lkml.kernel.org/r/20180403143909.GA21171@ulmo, fix NULL pointer
checking per https://lkml.kernel.org/r/20180403211505.GA29612@embeddedor.com]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
123 lines
3.2 KiB
C
123 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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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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