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lib: Add generic PIO mapping method

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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>
This commit is contained in:
Zhichang Yuan 2018-03-15 02:15:50 +08:00 • committed by Bjorn Helgaas
parent 7928b2cbe5
commit 031e360186
5 changed files with 423 additions and 0 deletions
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123
include/linux/logic_pio.h Normal file
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 HiSilicon Limited, All Rights Reserved.
* Author: Gabriele Paoloni <gabriele.paoloni@huawei.com>
* Author: Zhichang Yuan <yuanzhichang@hisilicon.com>
*/
#ifndef __LINUX_LOGIC_PIO_H
#define __LINUX_LOGIC_PIO_H
#include <linux/fwnode.h>
enum {
LOGIC_PIO_INDIRECT, /* Indirect IO flag */
LOGIC_PIO_CPU_MMIO, /* Memory-mapped IO flag */
};
struct logic_pio_hwaddr {
struct list_head list;
struct fwnode_handle *fwnode;
resource_size_t hw_start;
resource_size_t io_start;
resource_size_t size; /* range size populated */
unsigned long flags;
void *hostdata;
const struct logic_pio_host_ops *ops;
};
struct logic_pio_host_ops {
u32 (*in)(void *hostdata, unsigned long addr, size_t dwidth);
void (*out)(void *hostdata, unsigned long addr, u32 val,
size_t dwidth);
u32 (*ins)(void *hostdata, unsigned long addr, void *buffer,
size_t dwidth, unsigned int count);
void (*outs)(void *hostdata, unsigned long addr, const void *buffer,
size_t dwidth, unsigned int count);
};
#ifdef CONFIG_INDIRECT_PIO
u8 logic_inb(unsigned long addr);
void logic_outb(u8 value, unsigned long addr);
void logic_outw(u16 value, unsigned long addr);
void logic_outl(u32 value, unsigned long addr);
u16 logic_inw(unsigned long addr);
u32 logic_inl(unsigned long addr);
void logic_outb(u8 value, unsigned long addr);
void logic_outw(u16 value, unsigned long addr);
void logic_outl(u32 value, unsigned long addr);
void logic_insb(unsigned long addr, void *buffer, unsigned int count);
void logic_insl(unsigned long addr, void *buffer, unsigned int count);
void logic_insw(unsigned long addr, void *buffer, unsigned int count);
void logic_outsb(unsigned long addr, const void *buffer, unsigned int count);
void logic_outsw(unsigned long addr, const void *buffer, unsigned int count);
void logic_outsl(unsigned long addr, const void *buffer, unsigned int count);
#ifndef inb
#define inb logic_inb
#endif
#ifndef inw
#define inw logic_inw
#endif
#ifndef inl
#define inl logic_inl
#endif
#ifndef outb
#define outb logic_outb
#endif
#ifndef outw
#define outw logic_outw
#endif
#ifndef outl
#define outl logic_outl
#endif
#ifndef insb
#define insb logic_insb
#endif
#ifndef insw
#define insw logic_insw
#endif
#ifndef insl
#define insl logic_insl
#endif
#ifndef outsb
#define outsb logic_outsb
#endif
#ifndef outsw
#define outsw logic_outsw
#endif
#ifndef outsl
#define outsl logic_outsl
#endif
/*
* We reserve 0x4000 bytes for Indirect IO as so far this library is only
* used by the HiSilicon LPC Host. If needed, we can reserve a wider IO
* area by redefining the macro below.
*/
#define PIO_INDIRECT_SIZE 0x4000
#define MMIO_UPPER_LIMIT (IO_SPACE_LIMIT - PIO_INDIRECT_SIZE)
#else
#define MMIO_UPPER_LIMIT IO_SPACE_LIMIT
#endif /* CONFIG_INDIRECT_PIO */
struct logic_pio_hwaddr *find_io_range_by_fwnode(struct fwnode_handle *fwnode);
unsigned long logic_pio_trans_hwaddr(struct fwnode_handle *fwnode,
resource_size_t hw_addr, resource_size_t size);
int logic_pio_register_range(struct logic_pio_hwaddr *newrange);
resource_size_t logic_pio_to_hwaddr(unsigned long pio);
unsigned long logic_pio_trans_cpuaddr(resource_size_t hw_addr);
#endif /* __LINUX_LOGIC_PIO_H */