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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>
20#include <linux/smp.h>
21#include <linux/io.h>
22
23#include <asm/cacheflush.h>
24#include <asm/hardware/gic.h>
25#include <asm/smp_scu.h>
26
27#include <mach/hardware.h>
28#include <mach/omap-secure.h>
29
30#include "iomap.h"
31#include "common.h"
32#include "clockdomain.h"
33
34/* SCU base address */
35static void __iomem *scu_base;
36
37static DEFINE_SPINLOCK(boot_lock);
38
39void __iomem *omap4_get_scu_base(void)
40{
41 return scu_base;
42}
43
44void __cpuinit platform_secondary_init(unsigned int cpu)
45{
46 /*
47 * Configure ACTRL and enable NS SMP bit access on CPU1 on HS device.
48 * OMAP44XX EMU/HS devices - CPU0 SMP bit access is enabled in PPA
49 * init and for CPU1, a secure PPA API provided. CPU0 must be ON
50 * while executing NS_SMP API on CPU1 and PPA version must be 1.4.0+.
51 * OMAP443X GP devices- SMP bit isn't accessible.
52 * OMAP446X GP devices - SMP bit access is enabled on both CPUs.
53 */
54 if (cpu_is_omap443x() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
55 omap_secure_dispatcher(OMAP4_PPA_CPU_ACTRL_SMP_INDEX,
56 4, 0, 0, 0, 0, 0);
57
58 /*
59 * If any interrupts are already enabled for the primary
60 * core (e.g. timer irq), then they will not have been enabled
61 * for us: do so
62 */
63 gic_secondary_init(0);
64
65 /*
66 * Synchronise with the boot thread.
67 */
68 spin_lock(&boot_lock);
69 spin_unlock(&boot_lock);
70}
71
72int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
73{
74 static struct clockdomain *cpu1_clkdm;
75 static bool booted;
76 /*
77 * Set synchronisation state between this boot processor
78 * and the secondary one
79 */
80 spin_lock(&boot_lock);
81
82 /*
83 * Update the AuxCoreBoot0 with boot state for secondary core.
84 * omap_secondary_startup() routine will hold the secondary core till
85 * the AuxCoreBoot1 register is updated with cpu state
86 * A barrier is added to ensure that write buffer is drained
87 */
88 omap_modify_auxcoreboot0(0x200, 0xfffffdff);
89 flush_cache_all();
90 smp_wmb();
91
92 if (!cpu1_clkdm)
93 cpu1_clkdm = clkdm_lookup("mpu1_clkdm");
94
95 /*
96 * The SGI(Software Generated Interrupts) are not wakeup capable
97 * from low power states. This is known limitation on OMAP4 and
98 * needs to be worked around by using software forced clockdomain
99 * wake-up. To wakeup CPU1, CPU0 forces the CPU1 clockdomain to
100 * software force wakeup. The clockdomain is then put back to
101 * hardware supervised mode.
102 * More details can be found in OMAP4430 TRM - Version J
103 * Section :
104 * 4.3.4.2 Power States of CPU0 and CPU1
105 */
106 if (booted) {
107 clkdm_wakeup(cpu1_clkdm);
108 clkdm_allow_idle(cpu1_clkdm);
109 } else {
110 dsb_sev();
111 booted = true;
112 }
113
114 gic_raise_softirq(cpumask_of(cpu), 1);
115
116 /*
117 * Now the secondary core is starting up let it run its
118 * calibrations, then wait for it to finish
119 */
120 spin_unlock(&boot_lock);
121
122 return 0;
123}
124
125static void __init wakeup_secondary(void)
126{
127 /*
128 * Write the address of secondary startup routine into the
129 * AuxCoreBoot1 where ROM code will jump and start executing
130 * on secondary core once out of WFE
131 * A barrier is added to ensure that write buffer is drained
132 */
133 omap_auxcoreboot_addr(virt_to_phys(omap_secondary_startup));
134 smp_wmb();
135
136 /*
137 * Send a 'sev' to wake the secondary core from WFE.
138 * Drain the outstanding writes to memory
139 */
140 dsb_sev();
141 mb();
142}
143
144/*
145 * Initialise the CPU possible map early - this describes the CPUs
146 * which may be present or become present in the system.
147 */
148void __init smp_init_cpus(void)
149{
150 unsigned int i, ncores;
151
152 /*
153 * Currently we can't call ioremap here because
154 * SoC detection won't work until after init_early.
155 */
156 scu_base = OMAP2_L4_IO_ADDRESS(OMAP44XX_SCU_BASE);
157 BUG_ON(!scu_base);
158
159 ncores = scu_get_core_count(scu_base);
160
161 /* sanity check */
162 if (ncores > nr_cpu_ids) {
163 pr_warn("SMP: %u cores greater than maximum (%u), clipping\n",
164 ncores, nr_cpu_ids);
165 ncores = nr_cpu_ids;
166 }
167
168 for (i = 0; i < ncores; i++)
169 set_cpu_possible(i, true);
170
171 set_smp_cross_call(gic_raise_softirq);
172}
173
174void __init platform_smp_prepare_cpus(unsigned int max_cpus)
175{
176
177 /*
178 * Initialise the SCU and wake up the secondary core using
179 * wakeup_secondary().
180 */
181 scu_enable(scu_base);
182 wakeup_secondary();
183}
1/*
2 * OMAP4 SMP source file. It contains platform specific functions
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>
20#include <linux/smp.h>
21#include <linux/io.h>
22#include <linux/irqchip/arm-gic.h>
23
24#include <asm/sections.h>
25#include <asm/smp_scu.h>
26#include <asm/virt.h>
27
28#include "omap-secure.h"
29#include "omap-wakeupgen.h"
30#include <asm/cputype.h>
31
32#include "soc.h"
33#include "iomap.h"
34#include "common.h"
35#include "clockdomain.h"
36#include "pm.h"
37
38#define CPU_MASK 0xff0ffff0
39#define CPU_CORTEX_A9 0x410FC090
40#define CPU_CORTEX_A15 0x410FC0F0
41
42#define OMAP5_CORE_COUNT 0x2
43
44#define AUX_CORE_BOOT0_GP_RELEASE 0x020
45#define AUX_CORE_BOOT0_HS_RELEASE 0x200
46
47struct omap_smp_config {
48 unsigned long cpu1_rstctrl_pa;
49 void __iomem *cpu1_rstctrl_va;
50 void __iomem *scu_base;
51 void __iomem *wakeupgen_base;
52 void *startup_addr;
53};
54
55static struct omap_smp_config cfg;
56
57static const struct omap_smp_config omap443x_cfg __initconst = {
58 .cpu1_rstctrl_pa = 0x4824380c,
59 .startup_addr = omap4_secondary_startup,
60};
61
62static const struct omap_smp_config omap446x_cfg __initconst = {
63 .cpu1_rstctrl_pa = 0x4824380c,
64 .startup_addr = omap4460_secondary_startup,
65};
66
67static const struct omap_smp_config omap5_cfg __initconst = {
68 .cpu1_rstctrl_pa = 0x48243810,
69 .startup_addr = omap5_secondary_startup,
70};
71
72static DEFINE_SPINLOCK(boot_lock);
73
74void __iomem *omap4_get_scu_base(void)
75{
76 return cfg.scu_base;
77}
78
79#ifdef CONFIG_OMAP5_ERRATA_801819
80void omap5_erratum_workaround_801819(void)
81{
82 u32 acr, revidr;
83 u32 acr_mask;
84
85 /* REVIDR[3] indicates erratum fix available on silicon */
86 asm volatile ("mrc p15, 0, %0, c0, c0, 6" : "=r" (revidr));
87 if (revidr & (0x1 << 3))
88 return;
89
90 asm volatile ("mrc p15, 0, %0, c1, c0, 1" : "=r" (acr));
91 /*
92 * BIT(27) - Disables streaming. All write-allocate lines allocate in
93 * the L1 or L2 cache.
94 * BIT(25) - Disables streaming. All write-allocate lines allocate in
95 * the L1 cache.
96 */
97 acr_mask = (0x3 << 25) | (0x3 << 27);
98 /* do we already have it done.. if yes, skip expensive smc */
99 if ((acr & acr_mask) == acr_mask)
100 return;
101
102 acr |= acr_mask;
103 omap_smc1(OMAP5_DRA7_MON_SET_ACR_INDEX, acr);
104
105 pr_debug("%s: ARM erratum workaround 801819 applied on CPU%d\n",
106 __func__, smp_processor_id());
107}
108#else
109static inline void omap5_erratum_workaround_801819(void) { }
110#endif
111
112static void omap4_secondary_init(unsigned int cpu)
113{
114 /*
115 * Configure ACTRL and enable NS SMP bit access on CPU1 on HS device.
116 * OMAP44XX EMU/HS devices - CPU0 SMP bit access is enabled in PPA
117 * init and for CPU1, a secure PPA API provided. CPU0 must be ON
118 * while executing NS_SMP API on CPU1 and PPA version must be 1.4.0+.
119 * OMAP443X GP devices- SMP bit isn't accessible.
120 * OMAP446X GP devices - SMP bit access is enabled on both CPUs.
121 */
122 if (soc_is_omap443x() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
123 omap_secure_dispatcher(OMAP4_PPA_CPU_ACTRL_SMP_INDEX,
124 4, 0, 0, 0, 0, 0);
125
126 if (soc_is_omap54xx() || soc_is_dra7xx()) {
127 /*
128 * Configure the CNTFRQ register for the secondary cpu's which
129 * indicates the frequency of the cpu local timers.
130 */
131 set_cntfreq();
132 /* Configure ACR to disable streaming WA for 801819 */
133 omap5_erratum_workaround_801819();
134 }
135
136 /*
137 * Synchronise with the boot thread.
138 */
139 spin_lock(&boot_lock);
140 spin_unlock(&boot_lock);
141}
142
143static int omap4_boot_secondary(unsigned int cpu, struct task_struct *idle)
144{
145 static struct clockdomain *cpu1_clkdm;
146 static bool booted;
147 static struct powerdomain *cpu1_pwrdm;
148
149 /*
150 * Set synchronisation state between this boot processor
151 * and the secondary one
152 */
153 spin_lock(&boot_lock);
154
155 /*
156 * Update the AuxCoreBoot0 with boot state for secondary core.
157 * omap4_secondary_startup() routine will hold the secondary core till
158 * the AuxCoreBoot1 register is updated with cpu state
159 * A barrier is added to ensure that write buffer is drained
160 */
161 if (omap_secure_apis_support())
162 omap_modify_auxcoreboot0(AUX_CORE_BOOT0_HS_RELEASE,
163 0xfffffdff);
164 else
165 writel_relaxed(AUX_CORE_BOOT0_GP_RELEASE,
166 cfg.wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
167
168 if (!cpu1_clkdm && !cpu1_pwrdm) {
169 cpu1_clkdm = clkdm_lookup("mpu1_clkdm");
170 cpu1_pwrdm = pwrdm_lookup("cpu1_pwrdm");
171 }
172
173 /*
174 * The SGI(Software Generated Interrupts) are not wakeup capable
175 * from low power states. This is known limitation on OMAP4 and
176 * needs to be worked around by using software forced clockdomain
177 * wake-up. To wakeup CPU1, CPU0 forces the CPU1 clockdomain to
178 * software force wakeup. The clockdomain is then put back to
179 * hardware supervised mode.
180 * More details can be found in OMAP4430 TRM - Version J
181 * Section :
182 * 4.3.4.2 Power States of CPU0 and CPU1
183 */
184 if (booted && cpu1_pwrdm && cpu1_clkdm) {
185 /*
186 * GIC distributor control register has changed between
187 * CortexA9 r1pX and r2pX. The Control Register secure
188 * banked version is now composed of 2 bits:
189 * bit 0 == Secure Enable
190 * bit 1 == Non-Secure Enable
191 * The Non-Secure banked register has not changed
192 * Because the ROM Code is based on the r1pX GIC, the CPU1
193 * GIC restoration will cause a problem to CPU0 Non-Secure SW.
194 * The workaround must be:
195 * 1) Before doing the CPU1 wakeup, CPU0 must disable
196 * the GIC distributor
197 * 2) CPU1 must re-enable the GIC distributor on
198 * it's wakeup path.
199 */
200 if (IS_PM44XX_ERRATUM(PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD)) {
201 local_irq_disable();
202 gic_dist_disable();
203 }
204
205 /*
206 * Ensure that CPU power state is set to ON to avoid CPU
207 * powerdomain transition on wfi
208 */
209 clkdm_deny_idle_nolock(cpu1_clkdm);
210 pwrdm_set_next_pwrst(cpu1_pwrdm, PWRDM_POWER_ON);
211 clkdm_allow_idle_nolock(cpu1_clkdm);
212
213 if (IS_PM44XX_ERRATUM(PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD)) {
214 while (gic_dist_disabled()) {
215 udelay(1);
216 cpu_relax();
217 }
218 gic_timer_retrigger();
219 local_irq_enable();
220 }
221 } else {
222 dsb_sev();
223 booted = true;
224 }
225
226 arch_send_wakeup_ipi_mask(cpumask_of(cpu));
227
228 /*
229 * Now the secondary core is starting up let it run its
230 * calibrations, then wait for it to finish
231 */
232 spin_unlock(&boot_lock);
233
234 return 0;
235}
236
237/*
238 * Initialise the CPU possible map early - this describes the CPUs
239 * which may be present or become present in the system.
240 */
241static void __init omap4_smp_init_cpus(void)
242{
243 unsigned int i = 0, ncores = 1, cpu_id;
244
245 /* Use ARM cpuid check here, as SoC detection will not work so early */
246 cpu_id = read_cpuid_id() & CPU_MASK;
247 if (cpu_id == CPU_CORTEX_A9) {
248 /*
249 * Currently we can't call ioremap here because
250 * SoC detection won't work until after init_early.
251 */
252 cfg.scu_base = OMAP2_L4_IO_ADDRESS(scu_a9_get_base());
253 BUG_ON(!cfg.scu_base);
254 ncores = scu_get_core_count(cfg.scu_base);
255 } else if (cpu_id == CPU_CORTEX_A15) {
256 ncores = OMAP5_CORE_COUNT;
257 }
258
259 /* sanity check */
260 if (ncores > nr_cpu_ids) {
261 pr_warn("SMP: %u cores greater than maximum (%u), clipping\n",
262 ncores, nr_cpu_ids);
263 ncores = nr_cpu_ids;
264 }
265
266 for (i = 0; i < ncores; i++)
267 set_cpu_possible(i, true);
268}
269
270/*
271 * For now, just make sure the start-up address is not within the booting
272 * kernel space as that means we just overwrote whatever secondary_startup()
273 * code there was.
274 */
275static bool __init omap4_smp_cpu1_startup_valid(unsigned long addr)
276{
277 if ((addr >= __pa(PAGE_OFFSET)) && (addr <= __pa(__bss_start)))
278 return false;
279
280 return true;
281}
282
283/*
284 * We may need to reset CPU1 before configuring, otherwise kexec boot can end
285 * up trying to use old kernel startup address or suspend-resume will
286 * occasionally fail to bring up CPU1 on 4430 if CPU1 fails to enter deeper
287 * idle states.
288 */
289static void __init omap4_smp_maybe_reset_cpu1(struct omap_smp_config *c)
290{
291 unsigned long cpu1_startup_pa, cpu1_ns_pa_addr;
292 bool needs_reset = false;
293 u32 released;
294
295 if (omap_secure_apis_support())
296 released = omap_read_auxcoreboot0() & AUX_CORE_BOOT0_HS_RELEASE;
297 else
298 released = readl_relaxed(cfg.wakeupgen_base +
299 OMAP_AUX_CORE_BOOT_0) &
300 AUX_CORE_BOOT0_GP_RELEASE;
301 if (released) {
302 pr_warn("smp: CPU1 not parked?\n");
303
304 return;
305 }
306
307 cpu1_startup_pa = readl_relaxed(cfg.wakeupgen_base +
308 OMAP_AUX_CORE_BOOT_1);
309
310 /* Did the configured secondary_startup() get overwritten? */
311 if (!omap4_smp_cpu1_startup_valid(cpu1_startup_pa))
312 needs_reset = true;
313
314 /*
315 * If omap4 or 5 has NS_PA_ADDR configured, CPU1 may be in a
316 * deeper idle state in WFI and will wake to an invalid address.
317 */
318 if ((soc_is_omap44xx() || soc_is_omap54xx())) {
319 cpu1_ns_pa_addr = omap4_get_cpu1_ns_pa_addr();
320 if (!omap4_smp_cpu1_startup_valid(cpu1_ns_pa_addr))
321 needs_reset = true;
322 } else {
323 cpu1_ns_pa_addr = 0;
324 }
325
326 if (!needs_reset || !c->cpu1_rstctrl_va)
327 return;
328
329 pr_info("smp: CPU1 parked within kernel, needs reset (0x%lx 0x%lx)\n",
330 cpu1_startup_pa, cpu1_ns_pa_addr);
331
332 writel_relaxed(1, c->cpu1_rstctrl_va);
333 readl_relaxed(c->cpu1_rstctrl_va);
334 writel_relaxed(0, c->cpu1_rstctrl_va);
335}
336
337static void __init omap4_smp_prepare_cpus(unsigned int max_cpus)
338{
339 const struct omap_smp_config *c = NULL;
340
341 if (soc_is_omap443x())
342 c = &omap443x_cfg;
343 else if (soc_is_omap446x())
344 c = &omap446x_cfg;
345 else if (soc_is_dra74x() || soc_is_omap54xx() || soc_is_dra76x())
346 c = &omap5_cfg;
347
348 if (!c) {
349 pr_err("%s Unknown SMP SoC?\n", __func__);
350 return;
351 }
352
353 /* Must preserve cfg.scu_base set earlier */
354 cfg.cpu1_rstctrl_pa = c->cpu1_rstctrl_pa;
355 cfg.startup_addr = c->startup_addr;
356 cfg.wakeupgen_base = omap_get_wakeupgen_base();
357
358 if (soc_is_dra74x() || soc_is_omap54xx() || soc_is_dra76x()) {
359 if ((__boot_cpu_mode & MODE_MASK) == HYP_MODE)
360 cfg.startup_addr = omap5_secondary_hyp_startup;
361 omap5_erratum_workaround_801819();
362 }
363
364 cfg.cpu1_rstctrl_va = ioremap(cfg.cpu1_rstctrl_pa, 4);
365 if (!cfg.cpu1_rstctrl_va)
366 return;
367
368 /*
369 * Initialise the SCU and wake up the secondary core using
370 * wakeup_secondary().
371 */
372 if (cfg.scu_base)
373 scu_enable(cfg.scu_base);
374
375 omap4_smp_maybe_reset_cpu1(&cfg);
376
377 /*
378 * Write the address of secondary startup routine into the
379 * AuxCoreBoot1 where ROM code will jump and start executing
380 * on secondary core once out of WFE
381 * A barrier is added to ensure that write buffer is drained
382 */
383 if (omap_secure_apis_support())
384 omap_auxcoreboot_addr(__pa_symbol(cfg.startup_addr));
385 else
386 writel_relaxed(__pa_symbol(cfg.startup_addr),
387 cfg.wakeupgen_base + OMAP_AUX_CORE_BOOT_1);
388}
389
390const struct smp_operations omap4_smp_ops __initconst = {
391 .smp_init_cpus = omap4_smp_init_cpus,
392 .smp_prepare_cpus = omap4_smp_prepare_cpus,
393 .smp_secondary_init = omap4_secondary_init,
394 .smp_boot_secondary = omap4_boot_secondary,
395#ifdef CONFIG_HOTPLUG_CPU
396 .cpu_die = omap4_cpu_die,
397 .cpu_kill = omap4_cpu_kill,
398#endif
399};