xref: /openbmc/linux/include/soc/arc/mcip.h (revision 174ae4e9)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * ARConnect IP Support (Multi core enabler: Cross core IPI, RTC ...)
4  *
5  * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
6  */
7 
8 #ifndef __SOC_ARC_MCIP_H
9 #define __SOC_ARC_MCIP_H
10 
11 #include <soc/arc/aux.h>
12 
13 #define ARC_REG_MCIP_BCR	0x0d0
14 #define ARC_REG_MCIP_IDU_BCR	0x0D5
15 #define ARC_REG_GFRC_BUILD	0x0D6
16 #define ARC_REG_MCIP_CMD	0x600
17 #define ARC_REG_MCIP_WDATA	0x601
18 #define ARC_REG_MCIP_READBACK	0x602
19 
20 struct mcip_cmd {
21 #ifdef CONFIG_CPU_BIG_ENDIAN
22 	unsigned int pad:8, param:16, cmd:8;
23 #else
24 	unsigned int cmd:8, param:16, pad:8;
25 #endif
26 
27 #define CMD_INTRPT_GENERATE_IRQ		0x01
28 #define CMD_INTRPT_GENERATE_ACK		0x02
29 #define CMD_INTRPT_READ_STATUS		0x03
30 #define CMD_INTRPT_CHECK_SOURCE		0x04
31 
32 /* Semaphore Commands */
33 #define CMD_SEMA_CLAIM_AND_READ		0x11
34 #define CMD_SEMA_RELEASE		0x12
35 
36 #define CMD_DEBUG_SET_MASK		0x34
37 #define CMD_DEBUG_READ_MASK		0x35
38 #define CMD_DEBUG_SET_SELECT		0x36
39 #define CMD_DEBUG_READ_SELECT		0x37
40 
41 #define CMD_GFRC_READ_LO		0x42
42 #define CMD_GFRC_READ_HI		0x43
43 #define CMD_GFRC_SET_CORE		0x47
44 #define CMD_GFRC_READ_CORE		0x48
45 
46 #define CMD_IDU_ENABLE			0x71
47 #define CMD_IDU_DISABLE			0x72
48 #define CMD_IDU_SET_MODE		0x74
49 #define CMD_IDU_READ_MODE		0x75
50 #define CMD_IDU_SET_DEST		0x76
51 #define CMD_IDU_ACK_CIRQ		0x79
52 #define CMD_IDU_SET_MASK		0x7C
53 
54 #define IDU_M_TRIG_LEVEL		0x0
55 #define IDU_M_TRIG_EDGE			0x1
56 
57 #define IDU_M_DISTRI_RR			0x0
58 #define IDU_M_DISTRI_DEST		0x2
59 };
60 
61 struct mcip_bcr {
62 #ifdef CONFIG_CPU_BIG_ENDIAN
63 		unsigned int pad4:6, pw_dom:1, pad3:1,
64 			     idu:1, pad2:1, num_cores:6,
65 			     pad:1,  gfrc:1, dbg:1, pw:1,
66 			     msg:1, sem:1, ipi:1, slv:1,
67 			     ver:8;
68 #else
69 		unsigned int ver:8,
70 			     slv:1, ipi:1, sem:1, msg:1,
71 			     pw:1, dbg:1, gfrc:1, pad:1,
72 			     num_cores:6, pad2:1, idu:1,
73 			     pad3:1, pw_dom:1, pad4:6;
74 #endif
75 };
76 
77 struct mcip_idu_bcr {
78 #ifdef CONFIG_CPU_BIG_ENDIAN
79 	unsigned int pad:21, cirqnum:3, ver:8;
80 #else
81 	unsigned int ver:8, cirqnum:3, pad:21;
82 #endif
83 };
84 
85 
86 /*
87  * Build register for IDU contains not an actual number of supported common
88  * interrupts but an exponent of 2 which must be multiplied by 4 to
89  * get a number of supported common interrupts.
90  */
91 #define mcip_idu_bcr_to_nr_irqs(bcr) (4 * (1 << (bcr).cirqnum))
92 
93 /*
94  * MCIP programming model
95  *
96  * - Simple commands write {cmd:8,param:16} to MCIP_CMD aux reg
97  *   (param could be irq, common_irq, core_id ...)
98  * - More involved commands setup MCIP_WDATA with cmd specific data
99  *   before invoking the simple command
100  */
__mcip_cmd(unsigned int cmd,unsigned int param)101 static inline void __mcip_cmd(unsigned int cmd, unsigned int param)
102 {
103 	struct mcip_cmd buf;
104 
105 	buf.pad = 0;
106 	buf.cmd = cmd;
107 	buf.param = param;
108 
109 	WRITE_AUX(ARC_REG_MCIP_CMD, buf);
110 }
111 
112 /*
113  * Setup additional data for a cmd
114  * Callers need to lock to ensure atomicity
115  */
__mcip_cmd_data(unsigned int cmd,unsigned int param,unsigned int data)116 static inline void __mcip_cmd_data(unsigned int cmd, unsigned int param,
117 				   unsigned int data)
118 {
119 	write_aux_reg(ARC_REG_MCIP_WDATA, data);
120 
121 	__mcip_cmd(cmd, param);
122 }
123 
124 /*
125  * Read MCIP register
126  */
__mcip_cmd_read(unsigned int cmd,unsigned int param)127 static inline unsigned int __mcip_cmd_read(unsigned int cmd, unsigned int param)
128 {
129 	__mcip_cmd(cmd, param);
130 	return read_aux_reg(ARC_REG_MCIP_READBACK);
131 }
132 
133 #endif
134