include/linux/logic_pio.h

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2017 HiSilicon Limited, All Rights Reserved.
   4  * Author: Gabriele Paoloni <gabriele.paoloni@huawei.com>
   5  * Author: Zhichang Yuan <yuanzhichang@hisilicon.com>
   6  */
   7
   8 #ifndef __LINUX_LOGIC_PIO_H
   9 #define __LINUX_LOGIC_PIO_H
  10
  11 #include <linux/fwnode.h>
  12
  13 enum {
  14         LOGIC_PIO_INDIRECT,             /* Indirect IO flag */
  15         LOGIC_PIO_CPU_MMIO,             /* Memory-mapped IO flag */
  16 };
  17
  18 struct logic_pio_hwaddr {
  19         struct list_head list;
  20         const struct fwnode_handle *fwnode;
  21         resource_size_t hw_start;
  22         resource_size_t io_start;
  23         resource_size_t size; /* range size populated */
  24         unsigned long flags;
  25
  26         void *hostdata;
  27         const struct logic_pio_host_ops *ops;
  28 };
  29
  30 struct logic_pio_host_ops {
  31         u32 (*in)(void *hostdata, unsigned long addr, size_t dwidth);
  32         void (*out)(void *hostdata, unsigned long addr, u32 val,
  33                     size_t dwidth);
  34         u32 (*ins)(void *hostdata, unsigned long addr, void *buffer,
  35                    size_t dwidth, unsigned int count);
  36         void (*outs)(void *hostdata, unsigned long addr, const void *buffer,
  37                      size_t dwidth, unsigned int count);
  38 };
  39
  40 #ifdef CONFIG_INDIRECT_PIO
  41 u8 logic_inb(unsigned long addr);
  42 u16 logic_inw(unsigned long addr);
  43 u32 logic_inl(unsigned long addr);
  44 void logic_outb(u8 value, unsigned long addr);
  45 void logic_outw(u16 value, unsigned long addr);
  46 void logic_outl(u32 value, unsigned long addr);
  47 void logic_insb(unsigned long addr, void *buffer, unsigned int count);
  48 void logic_insl(unsigned long addr, void *buffer, unsigned int count);
  49 void logic_insw(unsigned long addr, void *buffer, unsigned int count);
  50 void logic_outsb(unsigned long addr, const void *buffer, unsigned int count);
  51 void logic_outsw(unsigned long addr, const void *buffer, unsigned int count);
  52 void logic_outsl(unsigned long addr, const void *buffer, unsigned int count);
  53
  54 #ifndef inb
  55 #define inb logic_inb
  56 #endif
  57
  58 #ifndef inw
  59 #define inw logic_inw
  60 #endif
  61
  62 #ifndef inl
  63 #define inl logic_inl
  64 #endif
  65
  66 #ifndef outb
  67 #define outb logic_outb
  68 #endif
  69
  70 #ifndef outw
  71 #define outw logic_outw
  72 #endif
  73
  74 #ifndef outl
  75 #define outl logic_outl
  76 #endif
  77
  78 #ifndef insb
  79 #define insb logic_insb
  80 #endif
  81
  82 #ifndef insw
  83 #define insw logic_insw
  84 #endif
  85
  86 #ifndef insl
  87 #define insl logic_insl
  88 #endif
  89
  90 #ifndef outsb
  91 #define outsb logic_outsb
  92 #endif
  93
  94 #ifndef outsw
  95 #define outsw logic_outsw
  96 #endif
  97
  98 #ifndef outsl
  99 #define outsl logic_outsl
 100 #endif
 101
 102 /*
 103  * We reserve 0x4000 bytes for Indirect IO as so far this library is only
 104  * used by the HiSilicon LPC Host. If needed, we can reserve a wider IO
 105  * area by redefining the macro below.
 106  */
 107 #define PIO_INDIRECT_SIZE 0x4000
 108 #else
 109 #define PIO_INDIRECT_SIZE 0
 110 #endif /* CONFIG_INDIRECT_PIO */
 111 #define MMIO_UPPER_LIMIT (IO_SPACE_LIMIT - PIO_INDIRECT_SIZE)
 112
 113 struct logic_pio_hwaddr *find_io_range_by_fwnode(const struct fwnode_handle *fwnode);
 114 unsigned long logic_pio_trans_hwaddr(const struct fwnode_handle *fwnode,
 115                         resource_size_t hw_addr, resource_size_t size);
 116 int logic_pio_register_range(struct logic_pio_hwaddr *newrange);
 117 void logic_pio_unregister_range(struct logic_pio_hwaddr *range);
 118 resource_size_t logic_pio_to_hwaddr(unsigned long pio);
 119 unsigned long logic_pio_trans_cpuaddr(resource_size_t hw_addr);
 120
 121 #endif /* __LINUX_LOGIC_PIO_H */