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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> | |
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 | ||
93640735 KH |
42 | u16 pm44xx_errata; |
43 | ||
367cd31e | 44 | /* SCU base address */ |
e4e7a13a | 45 | static void __iomem *scu_base; |
367cd31e | 46 | |
367cd31e SS |
47 | static DEFINE_SPINLOCK(boot_lock); |
48 | ||
02afe8a7 SS |
49 | void __iomem *omap4_get_scu_base(void) |
50 | { | |
51 | return scu_base; | |
52 | } | |
53 | ||
8bd26e3a | 54 | static void omap4_secondary_init(unsigned int cpu) |
367cd31e | 55 | { |
b2b9762f SS |
56 | /* |
57 | * Configure ACTRL and enable NS SMP bit access on CPU1 on HS device. | |
58 | * OMAP44XX EMU/HS devices - CPU0 SMP bit access is enabled in PPA | |
59 | * init and for CPU1, a secure PPA API provided. CPU0 must be ON | |
60 | * while executing NS_SMP API on CPU1 and PPA version must be 1.4.0+. | |
61 | * OMAP443X GP devices- SMP bit isn't accessible. | |
62 | * OMAP446X GP devices - SMP bit access is enabled on both CPUs. | |
63 | */ | |
64 | if (cpu_is_omap443x() && (omap_type() != OMAP2_DEVICE_TYPE_GP)) | |
65 | omap_secure_dispatcher(OMAP4_PPA_CPU_ACTRL_SMP_INDEX, | |
66 | 4, 0, 0, 0, 0, 0); | |
67 | ||
367cd31e SS |
68 | /* |
69 | * Synchronise with the boot thread. | |
70 | */ | |
71 | spin_lock(&boot_lock); | |
72 | spin_unlock(&boot_lock); | |
73 | } | |
74 | ||
8bd26e3a | 75 | static int omap4_boot_secondary(unsigned int cpu, struct task_struct *idle) |
367cd31e | 76 | { |
e97ca477 SS |
77 | static struct clockdomain *cpu1_clkdm; |
78 | static bool booted; | |
b7806dc7 | 79 | static struct powerdomain *cpu1_pwrdm; |
247c445c SS |
80 | void __iomem *base = omap_get_wakeupgen_base(); |
81 | ||
367cd31e SS |
82 | /* |
83 | * Set synchronisation state between this boot processor | |
84 | * and the secondary one | |
85 | */ | |
86 | spin_lock(&boot_lock); | |
87 | ||
88 | /* | |
942e2c9e | 89 | * Update the AuxCoreBoot0 with boot state for secondary core. |
baf4b7d3 | 90 | * omap4_secondary_startup() routine will hold the secondary core till |
367cd31e SS |
91 | * the AuxCoreBoot1 register is updated with cpu state |
92 | * A barrier is added to ensure that write buffer is drained | |
93 | */ | |
247c445c SS |
94 | if (omap_secure_apis_support()) |
95 | omap_modify_auxcoreboot0(0x200, 0xfffffdff); | |
96 | else | |
97 | __raw_writel(0x20, base + OMAP_AUX_CORE_BOOT_0); | |
98 | ||
b7806dc7 | 99 | if (!cpu1_clkdm && !cpu1_pwrdm) { |
e97ca477 | 100 | cpu1_clkdm = clkdm_lookup("mpu1_clkdm"); |
b7806dc7 SS |
101 | cpu1_pwrdm = pwrdm_lookup("cpu1_pwrdm"); |
102 | } | |
e97ca477 SS |
103 | |
104 | /* | |
105 | * The SGI(Software Generated Interrupts) are not wakeup capable | |
106 | * from low power states. This is known limitation on OMAP4 and | |
107 | * needs to be worked around by using software forced clockdomain | |
108 | * wake-up. To wakeup CPU1, CPU0 forces the CPU1 clockdomain to | |
109 | * software force wakeup. The clockdomain is then put back to | |
110 | * hardware supervised mode. | |
111 | * More details can be found in OMAP4430 TRM - Version J | |
112 | * Section : | |
113 | * 4.3.4.2 Power States of CPU0 and CPU1 | |
114 | */ | |
b7806dc7 | 115 | if (booted && cpu1_pwrdm && cpu1_clkdm) { |
ff999b8a SS |
116 | /* |
117 | * GIC distributor control register has changed between | |
118 | * CortexA9 r1pX and r2pX. The Control Register secure | |
119 | * banked version is now composed of 2 bits: | |
120 | * bit 0 == Secure Enable | |
121 | * bit 1 == Non-Secure Enable | |
122 | * The Non-Secure banked register has not changed | |
123 | * Because the ROM Code is based on the r1pX GIC, the CPU1 | |
124 | * GIC restoration will cause a problem to CPU0 Non-Secure SW. | |
125 | * The workaround must be: | |
126 | * 1) Before doing the CPU1 wakeup, CPU0 must disable | |
127 | * the GIC distributor | |
128 | * 2) CPU1 must re-enable the GIC distributor on | |
129 | * it's wakeup path. | |
130 | */ | |
cd8ce159 CC |
131 | if (IS_PM44XX_ERRATUM(PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD)) { |
132 | local_irq_disable(); | |
ff999b8a | 133 | gic_dist_disable(); |
cd8ce159 | 134 | } |
ff999b8a | 135 | |
b7806dc7 SS |
136 | /* |
137 | * Ensure that CPU power state is set to ON to avoid CPU | |
138 | * powerdomain transition on wfi | |
139 | */ | |
e97ca477 | 140 | clkdm_wakeup(cpu1_clkdm); |
b7806dc7 | 141 | omap_set_pwrdm_state(cpu1_pwrdm, PWRDM_POWER_ON); |
e97ca477 | 142 | clkdm_allow_idle(cpu1_clkdm); |
cd8ce159 CC |
143 | |
144 | if (IS_PM44XX_ERRATUM(PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD)) { | |
145 | while (gic_dist_disabled()) { | |
146 | udelay(1); | |
147 | cpu_relax(); | |
148 | } | |
149 | gic_timer_retrigger(); | |
150 | local_irq_enable(); | |
151 | } | |
e97ca477 SS |
152 | } else { |
153 | dsb_sev(); | |
154 | booted = true; | |
155 | } | |
156 | ||
b1cffebf | 157 | arch_send_wakeup_ipi_mask(cpumask_of(cpu)); |
367cd31e | 158 | |
367cd31e SS |
159 | /* |
160 | * Now the secondary core is starting up let it run its | |
161 | * calibrations, then wait for it to finish | |
162 | */ | |
163 | spin_unlock(&boot_lock); | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
367cd31e SS |
168 | /* |
169 | * Initialise the CPU possible map early - this describes the CPUs | |
170 | * which may be present or become present in the system. | |
171 | */ | |
06915321 | 172 | static void __init omap4_smp_init_cpus(void) |
367cd31e | 173 | { |
283f708c SS |
174 | unsigned int i = 0, ncores = 1, cpu_id; |
175 | ||
176 | /* Use ARM cpuid check here, as SoC detection will not work so early */ | |
ac52e83f | 177 | cpu_id = read_cpuid_id() & CPU_MASK; |
283f708c SS |
178 | if (cpu_id == CPU_CORTEX_A9) { |
179 | /* | |
180 | * Currently we can't call ioremap here because | |
181 | * SoC detection won't work until after init_early. | |
182 | */ | |
80d93756 | 183 | scu_base = OMAP2_L4_IO_ADDRESS(scu_a9_get_base()); |
283f708c SS |
184 | BUG_ON(!scu_base); |
185 | ncores = scu_get_core_count(scu_base); | |
186 | } else if (cpu_id == CPU_CORTEX_A15) { | |
187 | ncores = OMAP5_CORE_COUNT; | |
188 | } | |
367cd31e SS |
189 | |
190 | /* sanity check */ | |
a06f916b RK |
191 | if (ncores > nr_cpu_ids) { |
192 | pr_warn("SMP: %u cores greater than maximum (%u), clipping\n", | |
193 | ncores, nr_cpu_ids); | |
194 | ncores = nr_cpu_ids; | |
367cd31e | 195 | } |
367cd31e | 196 | |
bbc3d14e RK |
197 | for (i = 0; i < ncores; i++) |
198 | set_cpu_possible(i, true); | |
199 | } | |
200 | ||
06915321 | 201 | static void __init omap4_smp_prepare_cpus(unsigned int max_cpus) |
bbc3d14e | 202 | { |
baf4b7d3 | 203 | void *startup_addr = omap4_secondary_startup; |
b699ddd1 | 204 | void __iomem *base = omap_get_wakeupgen_base(); |
367cd31e | 205 | |
05c74a6c RK |
206 | /* |
207 | * Initialise the SCU and wake up the secondary core using | |
208 | * wakeup_secondary(). | |
209 | */ | |
283f708c SS |
210 | if (scu_base) |
211 | scu_enable(scu_base); | |
b699ddd1 SS |
212 | |
213 | if (cpu_is_omap446x()) { | |
baf4b7d3 | 214 | startup_addr = omap4460_secondary_startup; |
b699ddd1 SS |
215 | pm44xx_errata |= PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD; |
216 | } | |
217 | ||
218 | /* | |
219 | * Write the address of secondary startup routine into the | |
220 | * AuxCoreBoot1 where ROM code will jump and start executing | |
221 | * on secondary core once out of WFE | |
222 | * A barrier is added to ensure that write buffer is drained | |
223 | */ | |
224 | if (omap_secure_apis_support()) | |
225 | omap_auxcoreboot_addr(virt_to_phys(startup_addr)); | |
226 | else | |
227 | __raw_writel(virt_to_phys(omap5_secondary_startup), | |
228 | base + OMAP_AUX_CORE_BOOT_1); | |
229 | ||
367cd31e | 230 | } |
06915321 MZ |
231 | |
232 | struct smp_operations omap4_smp_ops __initdata = { | |
233 | .smp_init_cpus = omap4_smp_init_cpus, | |
234 | .smp_prepare_cpus = omap4_smp_prepare_cpus, | |
235 | .smp_secondary_init = omap4_secondary_init, | |
236 | .smp_boot_secondary = omap4_boot_secondary, | |
237 | #ifdef CONFIG_HOTPLUG_CPU | |
238 | .cpu_die = omap4_cpu_die, | |
239 | #endif | |
240 | }; |