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367cd31e SS |
1 | /* |
2 | * OMAP4 SMP source file. It contains platform specific fucntions | |
3 | * needed for the linux smp kernel. | |
4 | * | |
5 | * Copyright (C) 2009 Texas Instruments, Inc. | |
6 | * | |
7 | * Author: | |
8 | * Santosh Shilimkar <santosh.shilimkar@ti.com> | |
9 | * | |
10 | * Platform file needed for the OMAP4 SMP. This file is based on arm | |
11 | * realview smp platform. | |
12 | * * Copyright (c) 2002 ARM Limited. | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License version 2 as | |
16 | * published by the Free Software Foundation. | |
17 | */ | |
18 | #include <linux/init.h> | |
19 | #include <linux/device.h> | |
367cd31e SS |
20 | #include <linux/smp.h> |
21 | #include <linux/io.h> | |
22 | ||
942e2c9e | 23 | #include <asm/cacheflush.h> |
0f7b332f | 24 | #include <asm/hardware/gic.h> |
367cd31e | 25 | #include <asm/smp_scu.h> |
ee0839c2 | 26 | |
c1db9d73 | 27 | #include "omap-secure.h" |
732231a7 | 28 | #include "omap-wakeupgen.h" |
247c445c | 29 | #include <asm/cputype.h> |
4e65331c | 30 | |
dbc04161 | 31 | #include "soc.h" |
ee0839c2 | 32 | #include "iomap.h" |
4e65331c | 33 | #include "common.h" |
e97ca477 | 34 | #include "clockdomain.h" |
ff999b8a | 35 | #include "pm.h" |
e97ca477 | 36 | |
283f708c SS |
37 | #define CPU_MASK 0xff0ffff0 |
38 | #define CPU_CORTEX_A9 0x410FC090 | |
39 | #define CPU_CORTEX_A15 0x410FC0F0 | |
40 | ||
41 | #define OMAP5_CORE_COUNT 0x2 | |
42 | ||
367cd31e | 43 | /* SCU base address */ |
e4e7a13a | 44 | static void __iomem *scu_base; |
367cd31e | 45 | |
367cd31e SS |
46 | static DEFINE_SPINLOCK(boot_lock); |
47 | ||
02afe8a7 SS |
48 | void __iomem *omap4_get_scu_base(void) |
49 | { | |
50 | return scu_base; | |
51 | } | |
52 | ||
06915321 | 53 | static void __cpuinit omap4_secondary_init(unsigned int cpu) |
367cd31e | 54 | { |
b2b9762f SS |
55 | /* |
56 | * Configure ACTRL and enable NS SMP bit access on CPU1 on HS device. | |
57 | * OMAP44XX EMU/HS devices - CPU0 SMP bit access is enabled in PPA | |
58 | * init and for CPU1, a secure PPA API provided. CPU0 must be ON | |
59 | * while executing NS_SMP API on CPU1 and PPA version must be 1.4.0+. | |
60 | * OMAP443X GP devices- SMP bit isn't accessible. | |
61 | * OMAP446X GP devices - SMP bit access is enabled on both CPUs. | |
62 | */ | |
63 | if (cpu_is_omap443x() && (omap_type() != OMAP2_DEVICE_TYPE_GP)) | |
64 | omap_secure_dispatcher(OMAP4_PPA_CPU_ACTRL_SMP_INDEX, | |
65 | 4, 0, 0, 0, 0, 0); | |
66 | ||
367cd31e SS |
67 | /* |
68 | * If any interrupts are already enabled for the primary | |
69 | * core (e.g. timer irq), then they will not have been enabled | |
70 | * for us: do so | |
71 | */ | |
38489533 | 72 | gic_secondary_init(0); |
367cd31e SS |
73 | |
74 | /* | |
75 | * Synchronise with the boot thread. | |
76 | */ | |
77 | spin_lock(&boot_lock); | |
78 | spin_unlock(&boot_lock); | |
79 | } | |
80 | ||
06915321 | 81 | static int __cpuinit omap4_boot_secondary(unsigned int cpu, struct task_struct *idle) |
367cd31e | 82 | { |
e97ca477 SS |
83 | static struct clockdomain *cpu1_clkdm; |
84 | static bool booted; | |
247c445c SS |
85 | void __iomem *base = omap_get_wakeupgen_base(); |
86 | ||
367cd31e SS |
87 | /* |
88 | * Set synchronisation state between this boot processor | |
89 | * and the secondary one | |
90 | */ | |
91 | spin_lock(&boot_lock); | |
92 | ||
93 | /* | |
942e2c9e | 94 | * Update the AuxCoreBoot0 with boot state for secondary core. |
367cd31e SS |
95 | * omap_secondary_startup() routine will hold the secondary core till |
96 | * the AuxCoreBoot1 register is updated with cpu state | |
97 | * A barrier is added to ensure that write buffer is drained | |
98 | */ | |
247c445c SS |
99 | if (omap_secure_apis_support()) |
100 | omap_modify_auxcoreboot0(0x200, 0xfffffdff); | |
101 | else | |
102 | __raw_writel(0x20, base + OMAP_AUX_CORE_BOOT_0); | |
103 | ||
942e2c9e | 104 | flush_cache_all(); |
367cd31e | 105 | smp_wmb(); |
e97ca477 SS |
106 | |
107 | if (!cpu1_clkdm) | |
108 | cpu1_clkdm = clkdm_lookup("mpu1_clkdm"); | |
109 | ||
110 | /* | |
111 | * The SGI(Software Generated Interrupts) are not wakeup capable | |
112 | * from low power states. This is known limitation on OMAP4 and | |
113 | * needs to be worked around by using software forced clockdomain | |
114 | * wake-up. To wakeup CPU1, CPU0 forces the CPU1 clockdomain to | |
115 | * software force wakeup. The clockdomain is then put back to | |
116 | * hardware supervised mode. | |
117 | * More details can be found in OMAP4430 TRM - Version J | |
118 | * Section : | |
119 | * 4.3.4.2 Power States of CPU0 and CPU1 | |
120 | */ | |
121 | if (booted) { | |
ff999b8a SS |
122 | /* |
123 | * GIC distributor control register has changed between | |
124 | * CortexA9 r1pX and r2pX. The Control Register secure | |
125 | * banked version is now composed of 2 bits: | |
126 | * bit 0 == Secure Enable | |
127 | * bit 1 == Non-Secure Enable | |
128 | * The Non-Secure banked register has not changed | |
129 | * Because the ROM Code is based on the r1pX GIC, the CPU1 | |
130 | * GIC restoration will cause a problem to CPU0 Non-Secure SW. | |
131 | * The workaround must be: | |
132 | * 1) Before doing the CPU1 wakeup, CPU0 must disable | |
133 | * the GIC distributor | |
134 | * 2) CPU1 must re-enable the GIC distributor on | |
135 | * it's wakeup path. | |
136 | */ | |
137 | if (IS_PM44XX_ERRATUM(PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD)) | |
138 | gic_dist_disable(); | |
139 | ||
e97ca477 SS |
140 | clkdm_wakeup(cpu1_clkdm); |
141 | clkdm_allow_idle(cpu1_clkdm); | |
142 | } else { | |
143 | dsb_sev(); | |
144 | booted = true; | |
145 | } | |
146 | ||
79d15ce9 | 147 | gic_raise_softirq(cpumask_of(cpu), 0); |
367cd31e | 148 | |
367cd31e SS |
149 | /* |
150 | * Now the secondary core is starting up let it run its | |
151 | * calibrations, then wait for it to finish | |
152 | */ | |
153 | spin_unlock(&boot_lock); | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
158 | static void __init wakeup_secondary(void) | |
159 | { | |
ff999b8a | 160 | void *startup_addr = omap_secondary_startup; |
247c445c | 161 | void __iomem *base = omap_get_wakeupgen_base(); |
ff999b8a SS |
162 | |
163 | if (cpu_is_omap446x()) { | |
164 | startup_addr = omap_secondary_startup_4460; | |
165 | pm44xx_errata |= PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD; | |
166 | } | |
167 | ||
367cd31e SS |
168 | /* |
169 | * Write the address of secondary startup routine into the | |
942e2c9e | 170 | * AuxCoreBoot1 where ROM code will jump and start executing |
367cd31e SS |
171 | * on secondary core once out of WFE |
172 | * A barrier is added to ensure that write buffer is drained | |
173 | */ | |
247c445c | 174 | if (omap_secure_apis_support()) |
ff999b8a | 175 | omap_auxcoreboot_addr(virt_to_phys(startup_addr)); |
247c445c SS |
176 | else |
177 | __raw_writel(virt_to_phys(omap5_secondary_startup), | |
178 | base + OMAP_AUX_CORE_BOOT_1); | |
179 | ||
367cd31e SS |
180 | smp_wmb(); |
181 | ||
182 | /* | |
183 | * Send a 'sev' to wake the secondary core from WFE. | |
942e2c9e | 184 | * Drain the outstanding writes to memory |
367cd31e | 185 | */ |
a4192d32 | 186 | dsb_sev(); |
367cd31e SS |
187 | mb(); |
188 | } | |
189 | ||
190 | /* | |
191 | * Initialise the CPU possible map early - this describes the CPUs | |
192 | * which may be present or become present in the system. | |
193 | */ | |
06915321 | 194 | static void __init omap4_smp_init_cpus(void) |
367cd31e | 195 | { |
283f708c SS |
196 | unsigned int i = 0, ncores = 1, cpu_id; |
197 | ||
198 | /* Use ARM cpuid check here, as SoC detection will not work so early */ | |
199 | cpu_id = read_cpuid(CPUID_ID) & CPU_MASK; | |
200 | if (cpu_id == CPU_CORTEX_A9) { | |
201 | /* | |
202 | * Currently we can't call ioremap here because | |
203 | * SoC detection won't work until after init_early. | |
204 | */ | |
205 | scu_base = OMAP2_L4_IO_ADDRESS(OMAP44XX_SCU_BASE); | |
206 | BUG_ON(!scu_base); | |
207 | ncores = scu_get_core_count(scu_base); | |
208 | } else if (cpu_id == CPU_CORTEX_A15) { | |
209 | ncores = OMAP5_CORE_COUNT; | |
210 | } | |
367cd31e SS |
211 | |
212 | /* sanity check */ | |
a06f916b RK |
213 | if (ncores > nr_cpu_ids) { |
214 | pr_warn("SMP: %u cores greater than maximum (%u), clipping\n", | |
215 | ncores, nr_cpu_ids); | |
216 | ncores = nr_cpu_ids; | |
367cd31e | 217 | } |
367cd31e | 218 | |
bbc3d14e RK |
219 | for (i = 0; i < ncores; i++) |
220 | set_cpu_possible(i, true); | |
0f7b332f RK |
221 | |
222 | set_smp_cross_call(gic_raise_softirq); | |
bbc3d14e RK |
223 | } |
224 | ||
06915321 | 225 | static void __init omap4_smp_prepare_cpus(unsigned int max_cpus) |
bbc3d14e | 226 | { |
367cd31e | 227 | |
05c74a6c RK |
228 | /* |
229 | * Initialise the SCU and wake up the secondary core using | |
230 | * wakeup_secondary(). | |
231 | */ | |
283f708c SS |
232 | if (scu_base) |
233 | scu_enable(scu_base); | |
05c74a6c | 234 | wakeup_secondary(); |
367cd31e | 235 | } |
06915321 MZ |
236 | |
237 | struct smp_operations omap4_smp_ops __initdata = { | |
238 | .smp_init_cpus = omap4_smp_init_cpus, | |
239 | .smp_prepare_cpus = omap4_smp_prepare_cpus, | |
240 | .smp_secondary_init = omap4_secondary_init, | |
241 | .smp_boot_secondary = omap4_boot_secondary, | |
242 | #ifdef CONFIG_HOTPLUG_CPU | |
243 | .cpu_die = omap4_cpu_die, | |
244 | #endif | |
245 | }; |