1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Access to VGA videoram
4 *
5 * (c) 1998 Martin Mares <mj@ucw.cz>
6 */
7
8 #ifndef _LINUX_ASM_VGA_H_
9 #define _LINUX_ASM_VGA_H_
10
11 #include <asm/io.h>
12
13 #define VT_BUF_HAVE_RW
14 #define VT_BUF_HAVE_MEMSETW
15 #define VT_BUF_HAVE_MEMCPYW
16 #define VT_BUF_HAVE_MEMMOVEW
17
18 static inline void scr_writew(u16 val, volatile u16 *addr)
19 {
20 if (__is_ioaddr(addr))
21 __raw_writew(val, (volatile u16 __iomem *) addr);
22 else
23 *addr = val;
24 }
25
26 static inline u16 scr_readw(volatile const u16 *addr)
27 {
28 if (__is_ioaddr(addr))
29 return __raw_readw((volatile const u16 __iomem *) addr);
30 else
31 return *addr;
32 }
33
34 static inline void scr_memsetw(u16 *s, u16 c, unsigned int count)
35 {
36 if (__is_ioaddr(s))
37 memsetw_io((u16 __iomem *) s, c, count);
38 else
39 memset16(s, c, count / 2);
40 }
41
42 /* Do not trust that the usage will be correct; analyze the arguments. */
43 extern void scr_memcpyw(u16 *d, const u16 *s, unsigned int count);
44 extern void scr_memmovew(u16 *d, const u16 *s, unsigned int count);
45
46 /* ??? These are currently only used for downloading character sets. As
47 such, they don't need memory barriers. Is this all they are intended
48 to be used for? */
49 #define vga_readb(a) readb((u8 __iomem *)(a))
50 #define vga_writeb(v,a) writeb(v, (u8 __iomem *)(a))
51
52 #ifdef CONFIG_VGA_HOSE
53 #include <linux/ioport.h>
54 #include <linux/pci.h>
55
56 extern struct pci_controller *pci_vga_hose;
57
58 # define __is_port_vga(a) \
59 (((a) >= 0x3b0) && ((a) < 0x3e0) && \
60 ((a) != 0x3b3) && ((a) != 0x3d3))
61
62 # define __is_mem_vga(a) \
63 (((a) >= 0xa0000) && ((a) <= 0xc0000))
64
65 # define FIXUP_IOADDR_VGA(a) do { \
66 if (pci_vga_hose && __is_port_vga(a)) \
67 (a) += pci_vga_hose->io_space->start; \
68 } while(0)
69
70 # define FIXUP_MEMADDR_VGA(a) do { \
71 if (pci_vga_hose && __is_mem_vga(a)) \
72 (a) += pci_vga_hose->mem_space->start; \
73 } while(0)
74
75 #else /* CONFIG_VGA_HOSE */
76 # define pci_vga_hose 0
77 # define __is_port_vga(a) 0
78 # define __is_mem_vga(a) 0
79 # define FIXUP_IOADDR_VGA(a)
80 # define FIXUP_MEMADDR_VGA(a)
81 #endif /* CONFIG_VGA_HOSE */
82
83 #define VGA_MAP_MEM(x,s) ((unsigned long) ioremap(x, s))
84
85 #endif
86
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