xref: /openbmc/linux/arch/alpha/include/asm/vga.h (revision 6246ed09)
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 
17 static inline void scr_writew(u16 val, volatile u16 *addr)
18 {
19 	if (__is_ioaddr(addr))
20 		__raw_writew(val, (volatile u16 __iomem *) addr);
21 	else
22 		*addr = val;
23 }
24 
25 static inline u16 scr_readw(volatile const u16 *addr)
26 {
27 	if (__is_ioaddr(addr))
28 		return __raw_readw((volatile const u16 __iomem *) addr);
29 	else
30 		return *addr;
31 }
32 
33 static inline void scr_memsetw(u16 *s, u16 c, unsigned int count)
34 {
35 	if (__is_ioaddr(s))
36 		memsetw_io((u16 __iomem *) s, c, count);
37 	else
38 		memset16(s, c, count / 2);
39 }
40 
41 /* Do not trust that the usage will be correct; analyze the arguments.  */
42 extern void scr_memcpyw(u16 *d, const u16 *s, unsigned int count);
43 
44 /* ??? These are currently only used for downloading character sets.  As
45    such, they don't need memory barriers.  Is this all they are intended
46    to be used for?  */
47 #define vga_readb(a)	readb((u8 __iomem *)(a))
48 #define vga_writeb(v,a)	writeb(v, (u8 __iomem *)(a))
49 
50 #ifdef CONFIG_VGA_HOSE
51 #include <linux/ioport.h>
52 #include <linux/pci.h>
53 
54 extern struct pci_controller *pci_vga_hose;
55 
56 # define __is_port_vga(a)       \
57 	(((a) >= 0x3b0) && ((a) < 0x3e0) && \
58 	 ((a) != 0x3b3) && ((a) != 0x3d3))
59 
60 # define __is_mem_vga(a) \
61 	(((a) >= 0xa0000) && ((a) <= 0xc0000))
62 
63 # define FIXUP_IOADDR_VGA(a) do {                       \
64 	if (pci_vga_hose && __is_port_vga(a))     \
65 		(a) += pci_vga_hose->io_space->start;	  \
66  } while(0)
67 
68 # define FIXUP_MEMADDR_VGA(a) do {                       \
69 	if (pci_vga_hose && __is_mem_vga(a))     \
70 		(a) += pci_vga_hose->mem_space->start; \
71  } while(0)
72 
73 #else /* CONFIG_VGA_HOSE */
74 # define pci_vga_hose 0
75 # define __is_port_vga(a) 0
76 # define __is_mem_vga(a) 0
77 # define FIXUP_IOADDR_VGA(a)
78 # define FIXUP_MEMADDR_VGA(a)
79 #endif /* CONFIG_VGA_HOSE */
80 
81 #define VGA_MAP_MEM(x,s)	((unsigned long) ioremap(x, s))
82 
83 #endif
84