1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_IA64_XTP_H
3 #define _ASM_IA64_XTP_H
4 
5 #include <asm/io.h>
6 
7 #ifdef CONFIG_SMP
8 
9 #define XTP_OFFSET		0x1e0008
10 
11 #define SMP_IRQ_REDIRECTION	(1 << 0)
12 #define SMP_IPI_REDIRECTION	(1 << 1)
13 
14 extern unsigned char smp_int_redirect;
15 
16 /*
17  * XTP control functions:
18  *	min_xtp   : route all interrupts to this CPU
19  *	normal_xtp: nominal XTP value
20  *	max_xtp   : never deliver interrupts to this CPU.
21  */
22 
23 static inline void
min_xtp(void)24 min_xtp (void)
25 {
26 	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
27 		writeb(0x00, ipi_base_addr + XTP_OFFSET); /* XTP to min */
28 }
29 
30 static inline void
normal_xtp(void)31 normal_xtp (void)
32 {
33 	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
34 		writeb(0x08, ipi_base_addr + XTP_OFFSET); /* XTP normal */
35 }
36 
37 static inline void
max_xtp(void)38 max_xtp (void)
39 {
40 	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
41 		writeb(0x0f, ipi_base_addr + XTP_OFFSET); /* Set XTP to max */
42 }
43 
44 #endif /* CONFIG_SMP */
45 
46 #endif /* _ASM_IA64_XTP_Hy */
47