Commit | Line | Data |
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367cd31e | 1 | /* |
b6b24852 | 2 | * OMAP4 SMP source file. It contains platform specific functions |
367cd31e SS |
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> | |
520f7bd7 | 22 | #include <linux/irqchip/arm-gic.h> |
367cd31e | 23 | |
367cd31e | 24 | #include <asm/smp_scu.h> |
ee0839c2 | 25 | |
c1db9d73 | 26 | #include "omap-secure.h" |
732231a7 | 27 | #include "omap-wakeupgen.h" |
247c445c | 28 | #include <asm/cputype.h> |
4e65331c | 29 | |
dbc04161 | 30 | #include "soc.h" |
ee0839c2 | 31 | #include "iomap.h" |
4e65331c | 32 | #include "common.h" |
e97ca477 | 33 | #include "clockdomain.h" |
ff999b8a | 34 | #include "pm.h" |
e97ca477 | 35 | |
283f708c SS |
36 | #define CPU_MASK 0xff0ffff0 |
37 | #define CPU_CORTEX_A9 0x410FC090 | |
38 | #define CPU_CORTEX_A15 0x410FC0F0 | |
39 | ||
40 | #define OMAP5_CORE_COUNT 0x2 | |
41 | ||
367cd31e | 42 | /* SCU base address */ |
e4e7a13a | 43 | static void __iomem *scu_base; |
367cd31e | 44 | |
367cd31e SS |
45 | static DEFINE_SPINLOCK(boot_lock); |
46 | ||
02afe8a7 SS |
47 | void __iomem *omap4_get_scu_base(void) |
48 | { | |
49 | return scu_base; | |
50 | } | |
51 | ||
8bd26e3a | 52 | static void omap4_secondary_init(unsigned int cpu) |
367cd31e | 53 | { |
b2b9762f SS |
54 | /* |
55 | * Configure ACTRL and enable NS SMP bit access on CPU1 on HS device. | |
56 | * OMAP44XX EMU/HS devices - CPU0 SMP bit access is enabled in PPA | |
57 | * init and for CPU1, a secure PPA API provided. CPU0 must be ON | |
58 | * while executing NS_SMP API on CPU1 and PPA version must be 1.4.0+. | |
59 | * OMAP443X GP devices- SMP bit isn't accessible. | |
60 | * OMAP446X GP devices - SMP bit access is enabled on both CPUs. | |
61 | */ | |
62 | if (cpu_is_omap443x() && (omap_type() != OMAP2_DEVICE_TYPE_GP)) | |
63 | omap_secure_dispatcher(OMAP4_PPA_CPU_ACTRL_SMP_INDEX, | |
64 | 4, 0, 0, 0, 0, 0); | |
65 | ||
5523e409 S |
66 | /* |
67 | * Configure the CNTFRQ register for the secondary cpu's which | |
68 | * indicates the frequency of the cpu local timers. | |
69 | */ | |
70 | if (soc_is_omap54xx() || soc_is_dra7xx()) | |
71 | set_cntfreq(); | |
72 | ||
367cd31e SS |
73 | /* |
74 | * Synchronise with the boot thread. | |
75 | */ | |
76 | spin_lock(&boot_lock); | |
77 | spin_unlock(&boot_lock); | |
78 | } | |
79 | ||
8bd26e3a | 80 | static int omap4_boot_secondary(unsigned int cpu, struct task_struct *idle) |
367cd31e | 81 | { |
e97ca477 SS |
82 | static struct clockdomain *cpu1_clkdm; |
83 | static bool booted; | |
b7806dc7 | 84 | static struct powerdomain *cpu1_pwrdm; |
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. |
baf4b7d3 | 95 | * omap4_secondary_startup() routine will hold the secondary core till |
367cd31e SS |
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 | |
edfaf05c | 102 | writel_relaxed(0x20, base + OMAP_AUX_CORE_BOOT_0); |
247c445c | 103 | |
b7806dc7 | 104 | if (!cpu1_clkdm && !cpu1_pwrdm) { |
e97ca477 | 105 | cpu1_clkdm = clkdm_lookup("mpu1_clkdm"); |
b7806dc7 SS |
106 | cpu1_pwrdm = pwrdm_lookup("cpu1_pwrdm"); |
107 | } | |
e97ca477 SS |
108 | |
109 | /* | |
110 | * The SGI(Software Generated Interrupts) are not wakeup capable | |
111 | * from low power states. This is known limitation on OMAP4 and | |
112 | * needs to be worked around by using software forced clockdomain | |
113 | * wake-up. To wakeup CPU1, CPU0 forces the CPU1 clockdomain to | |
114 | * software force wakeup. The clockdomain is then put back to | |
115 | * hardware supervised mode. | |
116 | * More details can be found in OMAP4430 TRM - Version J | |
117 | * Section : | |
118 | * 4.3.4.2 Power States of CPU0 and CPU1 | |
119 | */ | |
b7806dc7 | 120 | if (booted && cpu1_pwrdm && cpu1_clkdm) { |
ff999b8a SS |
121 | /* |
122 | * GIC distributor control register has changed between | |
123 | * CortexA9 r1pX and r2pX. The Control Register secure | |
124 | * banked version is now composed of 2 bits: | |
125 | * bit 0 == Secure Enable | |
126 | * bit 1 == Non-Secure Enable | |
127 | * The Non-Secure banked register has not changed | |
128 | * Because the ROM Code is based on the r1pX GIC, the CPU1 | |
129 | * GIC restoration will cause a problem to CPU0 Non-Secure SW. | |
130 | * The workaround must be: | |
131 | * 1) Before doing the CPU1 wakeup, CPU0 must disable | |
132 | * the GIC distributor | |
133 | * 2) CPU1 must re-enable the GIC distributor on | |
134 | * it's wakeup path. | |
135 | */ | |
cd8ce159 CC |
136 | if (IS_PM44XX_ERRATUM(PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD)) { |
137 | local_irq_disable(); | |
ff999b8a | 138 | gic_dist_disable(); |
cd8ce159 | 139 | } |
ff999b8a | 140 | |
b7806dc7 SS |
141 | /* |
142 | * Ensure that CPU power state is set to ON to avoid CPU | |
143 | * powerdomain transition on wfi | |
144 | */ | |
e97ca477 | 145 | clkdm_wakeup(cpu1_clkdm); |
b7806dc7 | 146 | omap_set_pwrdm_state(cpu1_pwrdm, PWRDM_POWER_ON); |
e97ca477 | 147 | clkdm_allow_idle(cpu1_clkdm); |
cd8ce159 CC |
148 | |
149 | if (IS_PM44XX_ERRATUM(PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD)) { | |
150 | while (gic_dist_disabled()) { | |
151 | udelay(1); | |
152 | cpu_relax(); | |
153 | } | |
154 | gic_timer_retrigger(); | |
155 | local_irq_enable(); | |
156 | } | |
e97ca477 SS |
157 | } else { |
158 | dsb_sev(); | |
159 | booted = true; | |
160 | } | |
161 | ||
b1cffebf | 162 | arch_send_wakeup_ipi_mask(cpumask_of(cpu)); |
367cd31e | 163 | |
367cd31e SS |
164 | /* |
165 | * Now the secondary core is starting up let it run its | |
166 | * calibrations, then wait for it to finish | |
167 | */ | |
168 | spin_unlock(&boot_lock); | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
367cd31e SS |
173 | /* |
174 | * Initialise the CPU possible map early - this describes the CPUs | |
175 | * which may be present or become present in the system. | |
176 | */ | |
06915321 | 177 | static void __init omap4_smp_init_cpus(void) |
367cd31e | 178 | { |
283f708c SS |
179 | unsigned int i = 0, ncores = 1, cpu_id; |
180 | ||
181 | /* Use ARM cpuid check here, as SoC detection will not work so early */ | |
ac52e83f | 182 | cpu_id = read_cpuid_id() & CPU_MASK; |
283f708c SS |
183 | if (cpu_id == CPU_CORTEX_A9) { |
184 | /* | |
185 | * Currently we can't call ioremap here because | |
186 | * SoC detection won't work until after init_early. | |
187 | */ | |
80d93756 | 188 | scu_base = OMAP2_L4_IO_ADDRESS(scu_a9_get_base()); |
283f708c SS |
189 | BUG_ON(!scu_base); |
190 | ncores = scu_get_core_count(scu_base); | |
191 | } else if (cpu_id == CPU_CORTEX_A15) { | |
192 | ncores = OMAP5_CORE_COUNT; | |
193 | } | |
367cd31e SS |
194 | |
195 | /* sanity check */ | |
a06f916b RK |
196 | if (ncores > nr_cpu_ids) { |
197 | pr_warn("SMP: %u cores greater than maximum (%u), clipping\n", | |
198 | ncores, nr_cpu_ids); | |
199 | ncores = nr_cpu_ids; | |
367cd31e | 200 | } |
367cd31e | 201 | |
bbc3d14e RK |
202 | for (i = 0; i < ncores; i++) |
203 | set_cpu_possible(i, true); | |
204 | } | |
205 | ||
06915321 | 206 | static void __init omap4_smp_prepare_cpus(unsigned int max_cpus) |
bbc3d14e | 207 | { |
baf4b7d3 | 208 | void *startup_addr = omap4_secondary_startup; |
b699ddd1 | 209 | void __iomem *base = omap_get_wakeupgen_base(); |
367cd31e | 210 | |
05c74a6c RK |
211 | /* |
212 | * Initialise the SCU and wake up the secondary core using | |
213 | * wakeup_secondary(). | |
214 | */ | |
283f708c SS |
215 | if (scu_base) |
216 | scu_enable(scu_base); | |
b699ddd1 | 217 | |
de70af49 | 218 | if (cpu_is_omap446x()) |
baf4b7d3 | 219 | startup_addr = omap4460_secondary_startup; |
b699ddd1 SS |
220 | |
221 | /* | |
222 | * Write the address of secondary startup routine into the | |
223 | * AuxCoreBoot1 where ROM code will jump and start executing | |
224 | * on secondary core once out of WFE | |
225 | * A barrier is added to ensure that write buffer is drained | |
226 | */ | |
227 | if (omap_secure_apis_support()) | |
228 | omap_auxcoreboot_addr(virt_to_phys(startup_addr)); | |
229 | else | |
edfaf05c VK |
230 | writel_relaxed(virt_to_phys(omap5_secondary_startup), |
231 | base + OMAP_AUX_CORE_BOOT_1); | |
b699ddd1 | 232 | |
367cd31e | 233 | } |
06915321 MZ |
234 | |
235 | struct smp_operations omap4_smp_ops __initdata = { | |
236 | .smp_init_cpus = omap4_smp_init_cpus, | |
237 | .smp_prepare_cpus = omap4_smp_prepare_cpus, | |
238 | .smp_secondary_init = omap4_secondary_init, | |
239 | .smp_boot_secondary = omap4_boot_secondary, | |
240 | #ifdef CONFIG_HOTPLUG_CPU | |
241 | .cpu_die = omap4_cpu_die, | |
242 | #endif | |
243 | }; |