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1 | /* |
2 | * SMP support for R-Mobile / SH-Mobile - r8a7779 portion | |
3 | * | |
4 | * Copyright (C) 2011 Renesas Solutions Corp. | |
5 | * Copyright (C) 2011 Magnus Damm | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; version 2 of the License. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/smp.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <linux/io.h> | |
25 | #include <linux/delay.h> | |
26 | #include <mach/common.h> | |
27 | #include <mach/r8a7779.h> | |
28 | #include <asm/smp_scu.h> | |
29 | #include <asm/smp_twd.h> | |
30 | #include <asm/hardware/gic.h> | |
31 | ||
32 | #define AVECR 0xfe700040 | |
33 | ||
34 | static struct r8a7779_pm_ch r8a7779_ch_cpu1 = { | |
35 | .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ | |
36 | .chan_bit = 1, /* ARM1 */ | |
37 | .isr_bit = 1, /* ARM1 */ | |
38 | }; | |
39 | ||
40 | static struct r8a7779_pm_ch r8a7779_ch_cpu2 = { | |
41 | .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ | |
42 | .chan_bit = 2, /* ARM2 */ | |
43 | .isr_bit = 2, /* ARM2 */ | |
44 | }; | |
45 | ||
46 | static struct r8a7779_pm_ch r8a7779_ch_cpu3 = { | |
47 | .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */ | |
48 | .chan_bit = 3, /* ARM3 */ | |
49 | .isr_bit = 3, /* ARM3 */ | |
50 | }; | |
51 | ||
52 | static struct r8a7779_pm_ch *r8a7779_ch_cpu[4] = { | |
53 | [1] = &r8a7779_ch_cpu1, | |
54 | [2] = &r8a7779_ch_cpu2, | |
55 | [3] = &r8a7779_ch_cpu3, | |
56 | }; | |
57 | ||
58 | static void __iomem *scu_base_addr(void) | |
59 | { | |
60 | return (void __iomem *)0xf0000000; | |
61 | } | |
62 | ||
63 | static DEFINE_SPINLOCK(scu_lock); | |
64 | static unsigned long tmp; | |
65 | ||
66 | static void modify_scu_cpu_psr(unsigned long set, unsigned long clr) | |
67 | { | |
68 | void __iomem *scu_base = scu_base_addr(); | |
69 | ||
70 | spin_lock(&scu_lock); | |
71 | tmp = __raw_readl(scu_base + 8); | |
72 | tmp &= ~clr; | |
73 | tmp |= set; | |
74 | spin_unlock(&scu_lock); | |
75 | ||
76 | /* disable cache coherency after releasing the lock */ | |
77 | __raw_writel(tmp, scu_base + 8); | |
78 | } | |
79 | ||
80 | unsigned int __init r8a7779_get_core_count(void) | |
81 | { | |
82 | void __iomem *scu_base = scu_base_addr(); | |
83 | ||
84 | #ifdef CONFIG_HAVE_ARM_TWD | |
85 | /* twd_base needs to be initialized before percpu_timer_setup() */ | |
86 | twd_base = (void __iomem *)0xf0000600; | |
87 | #endif | |
88 | ||
89 | return scu_get_core_count(scu_base); | |
90 | } | |
91 | ||
92 | int r8a7779_platform_cpu_kill(unsigned int cpu) | |
93 | { | |
94 | struct r8a7779_pm_ch *ch = NULL; | |
95 | int ret = -EIO; | |
96 | ||
97 | cpu = cpu_logical_map(cpu); | |
98 | ||
99 | /* disable cache coherency */ | |
100 | modify_scu_cpu_psr(3 << (cpu * 8), 0); | |
101 | ||
102 | if (cpu < ARRAY_SIZE(r8a7779_ch_cpu)) | |
103 | ch = r8a7779_ch_cpu[cpu]; | |
104 | ||
105 | if (ch) | |
106 | ret = r8a7779_sysc_power_down(ch); | |
107 | ||
108 | return ret ? ret : 1; | |
109 | } | |
110 | ||
111 | void __cpuinit r8a7779_secondary_init(unsigned int cpu) | |
112 | { | |
113 | gic_secondary_init(0); | |
114 | } | |
115 | ||
116 | int __cpuinit r8a7779_boot_secondary(unsigned int cpu) | |
117 | { | |
118 | struct r8a7779_pm_ch *ch = NULL; | |
119 | int ret = -EIO; | |
120 | ||
121 | cpu = cpu_logical_map(cpu); | |
122 | ||
123 | /* enable cache coherency */ | |
124 | modify_scu_cpu_psr(0, 3 << (cpu * 8)); | |
125 | ||
126 | if (cpu < ARRAY_SIZE(r8a7779_ch_cpu)) | |
127 | ch = r8a7779_ch_cpu[cpu]; | |
128 | ||
129 | if (ch) | |
130 | ret = r8a7779_sysc_power_up(ch); | |
131 | ||
132 | return ret; | |
133 | } | |
134 | ||
135 | void __init r8a7779_smp_prepare_cpus(void) | |
136 | { | |
137 | int cpu = cpu_logical_map(0); | |
138 | ||
139 | scu_enable(scu_base_addr()); | |
140 | ||
141 | /* Map the reset vector (in headsmp.S) */ | |
142 | __raw_writel(__pa(shmobile_secondary_vector), __io(AVECR)); | |
143 | ||
144 | /* enable cache coherency on CPU0 */ | |
145 | modify_scu_cpu_psr(0, 3 << (cpu * 8)); | |
146 | ||
147 | r8a7779_pm_init(); | |
148 | ||
149 | /* power off secondary CPUs */ | |
150 | r8a7779_platform_cpu_kill(1); | |
151 | r8a7779_platform_cpu_kill(2); | |
152 | r8a7779_platform_cpu_kill(3); | |
153 | } |