xref: /openbmc/linux/include/linux/logic_pio.h (revision b8104fda)
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 	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 void logic_outb(u8 value, unsigned long addr);
43 void logic_outw(u16 value, unsigned long addr);
44 void logic_outl(u32 value, unsigned long addr);
45 u16 logic_inw(unsigned long addr);
46 u32 logic_inl(unsigned long addr);
47 void logic_outb(u8 value, unsigned long addr);
48 void logic_outw(u16 value, unsigned long addr);
49 void logic_outl(u32 value, unsigned long addr);
50 void logic_insb(unsigned long addr, void *buffer, unsigned int count);
51 void logic_insl(unsigned long addr, void *buffer, unsigned int count);
52 void logic_insw(unsigned long addr, void *buffer, unsigned int count);
53 void logic_outsb(unsigned long addr, const void *buffer, unsigned int count);
54 void logic_outsw(unsigned long addr, const void *buffer, unsigned int count);
55 void logic_outsl(unsigned long addr, const void *buffer, unsigned int count);
56 
57 #ifndef inb
58 #define inb logic_inb
59 #endif
60 
61 #ifndef inw
62 #define inw logic_inw
63 #endif
64 
65 #ifndef inl
66 #define inl logic_inl
67 #endif
68 
69 #ifndef outb
70 #define outb logic_outb
71 #endif
72 
73 #ifndef outw
74 #define outw logic_outw
75 #endif
76 
77 #ifndef outl
78 #define outl logic_outl
79 #endif
80 
81 #ifndef insb
82 #define insb logic_insb
83 #endif
84 
85 #ifndef insw
86 #define insw logic_insw
87 #endif
88 
89 #ifndef insl
90 #define insl logic_insl
91 #endif
92 
93 #ifndef outsb
94 #define outsb logic_outsb
95 #endif
96 
97 #ifndef outsw
98 #define outsw logic_outsw
99 #endif
100 
101 #ifndef outsl
102 #define outsl logic_outsl
103 #endif
104 
105 /*
106  * We reserve 0x4000 bytes for Indirect IO as so far this library is only
107  * used by the HiSilicon LPC Host. If needed, we can reserve a wider IO
108  * area by redefining the macro below.
109  */
110 #define PIO_INDIRECT_SIZE 0x4000
111 #else
112 #define PIO_INDIRECT_SIZE 0
113 #endif /* CONFIG_INDIRECT_PIO */
114 #define MMIO_UPPER_LIMIT (IO_SPACE_LIMIT - PIO_INDIRECT_SIZE)
115 
116 struct logic_pio_hwaddr *find_io_range_by_fwnode(struct fwnode_handle *fwnode);
117 unsigned long logic_pio_trans_hwaddr(struct fwnode_handle *fwnode,
118 			resource_size_t hw_addr, resource_size_t size);
119 int logic_pio_register_range(struct logic_pio_hwaddr *newrange);
120 void logic_pio_unregister_range(struct logic_pio_hwaddr *range);
121 resource_size_t logic_pio_to_hwaddr(unsigned long pio);
122 unsigned long logic_pio_trans_cpuaddr(resource_size_t hw_addr);
123 
124 #endif /* __LINUX_LOGIC_PIO_H */
125