1 /*
2 * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
3 * reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the NetLogic
9 * license below:
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in
19 * the documentation and/or other materials provided with the
20 * distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
24 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
29 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
31 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
32 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35 #include <linux/init.h>
36 #include <linux/kernel.h>
37 #include <linux/threads.h>
38
39 #include <asm/asm.h>
40 #include <asm/asm-offsets.h>
41 #include <asm/mipsregs.h>
42 #include <asm/addrspace.h>
43 #include <asm/string.h>
44
45 #include <asm/netlogic/haldefs.h>
46 #include <asm/netlogic/common.h>
47 #include <asm/netlogic/mips-extns.h>
48
49 #include <asm/netlogic/xlp-hal/iomap.h>
50 #include <asm/netlogic/xlp-hal/pic.h>
51 #include <asm/netlogic/xlp-hal/xlp.h>
52 #include <asm/netlogic/xlp-hal/sys.h>
53
xlp_enable_secondary_cores(void)54 static void xlp_enable_secondary_cores(void)
55 {
56 uint32_t core, value, coremask, syscoremask;
57 int count;
58
59 /* read cores in reset from SYS block */
60 syscoremask = nlm_read_sys_reg(nlm_sys_base, SYS_CPU_RESET);
61
62 /* update user specified */
63 nlm_coremask = nlm_coremask & (syscoremask | 1);
64
65 for (core = 1; core < 8; core++) {
66 coremask = 1 << core;
67 if ((nlm_coremask & coremask) == 0)
68 continue;
69
70 /* Enable CPU clock */
71 value = nlm_read_sys_reg(nlm_sys_base, SYS_CORE_DFS_DIS_CTRL);
72 value &= ~coremask;
73 nlm_write_sys_reg(nlm_sys_base, SYS_CORE_DFS_DIS_CTRL, value);
74
75 /* Remove CPU Reset */
76 value = nlm_read_sys_reg(nlm_sys_base, SYS_CPU_RESET);
77 value &= ~coremask;
78 nlm_write_sys_reg(nlm_sys_base, SYS_CPU_RESET, value);
79
80 /* Poll for CPU to mark itself coherent */
81 count = 100000;
82 do {
83 value = nlm_read_sys_reg(nlm_sys_base,
84 SYS_CPU_NONCOHERENT_MODE);
85 } while ((value & coremask) != 0 && count-- > 0);
86
87 if (count == 0)
88 pr_err("Failed to enable core %d\n", core);
89 }
90 }
91
xlp_wakeup_secondary_cpus(void)92 void xlp_wakeup_secondary_cpus(void)
93 {
94 /*
95 * In case of u-boot, the secondaries are in reset
96 * first wakeup core 0 threads
97 */
98 xlp_boot_core0_siblings();
99
100 /* now get other cores out of reset */
101 xlp_enable_secondary_cores();
102 }
103