xref: /openbmc/u-boot/arch/arm/cpu/armv7/psci.S (revision ebfa18cb) 
1/*
2 * Copyright (C) 2013,2014 - ARM Ltd
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#include <config.h>
19#include <linux/linkage.h>
20#include <asm/macro.h>
21#include <asm/psci.h>
22
23	.pushsection ._secure.text, "ax"
24
25	.arch_extension	sec
26
27	.align	5
28	.globl _psci_vectors
29_psci_vectors:
30	b	default_psci_vector	@ reset
31	b	default_psci_vector	@ undef
32	b	_smc_psci		@ smc
33	b	default_psci_vector	@ pabort
34	b	default_psci_vector	@ dabort
35	b	default_psci_vector	@ hyp
36	b	default_psci_vector	@ irq
37	b	psci_fiq_enter		@ fiq
38
39ENTRY(psci_fiq_enter)
40	movs	pc, lr
41ENDPROC(psci_fiq_enter)
42.weak psci_fiq_enter
43
44ENTRY(default_psci_vector)
45	movs	pc, lr
46ENDPROC(default_psci_vector)
47.weak default_psci_vector
48
49ENTRY(psci_version)
50ENTRY(psci_cpu_suspend)
51ENTRY(psci_cpu_off)
52ENTRY(psci_cpu_on)
53ENTRY(psci_affinity_info)
54ENTRY(psci_migrate)
55ENTRY(psci_migrate_info_type)
56ENTRY(psci_migrate_info_up_cpu)
57ENTRY(psci_system_off)
58ENTRY(psci_system_reset)
59ENTRY(psci_features)
60ENTRY(psci_cpu_freeze)
61ENTRY(psci_cpu_default_suspend)
62ENTRY(psci_node_hw_state)
63ENTRY(psci_system_suspend)
64ENTRY(psci_set_suspend_mode)
65ENTRY(psi_stat_residency)
66ENTRY(psci_stat_count)
67	mov	r0, #ARM_PSCI_RET_NI	@ Return -1 (Not Implemented)
68	mov	pc, lr
69ENDPROC(psci_stat_count)
70ENDPROC(psi_stat_residency)
71ENDPROC(psci_set_suspend_mode)
72ENDPROC(psci_system_suspend)
73ENDPROC(psci_node_hw_state)
74ENDPROC(psci_cpu_default_suspend)
75ENDPROC(psci_cpu_freeze)
76ENDPROC(psci_features)
77ENDPROC(psci_system_reset)
78ENDPROC(psci_system_off)
79ENDPROC(psci_migrate_info_up_cpu)
80ENDPROC(psci_migrate_info_type)
81ENDPROC(psci_migrate)
82ENDPROC(psci_affinity_info)
83ENDPROC(psci_cpu_on)
84ENDPROC(psci_cpu_off)
85ENDPROC(psci_cpu_suspend)
86ENDPROC(psci_version)
87.weak psci_version
88.weak psci_cpu_suspend
89.weak psci_cpu_off
90.weak psci_cpu_on
91.weak psci_affinity_info
92.weak psci_migrate
93.weak psci_migrate_info_type
94.weak psci_migrate_info_up_cpu
95.weak psci_system_off
96.weak psci_system_reset
97.weak psci_features
98.weak psci_cpu_freeze
99.weak psci_cpu_default_suspend
100.weak psci_node_hw_state
101.weak psci_system_suspend
102.weak psci_set_suspend_mode
103.weak psi_stat_residency
104.weak psci_stat_count
105
106_psci_table:
107	.word	ARM_PSCI_FN_CPU_SUSPEND
108	.word	psci_cpu_suspend
109	.word	ARM_PSCI_FN_CPU_OFF
110	.word	psci_cpu_off
111	.word	ARM_PSCI_FN_CPU_ON
112	.word	psci_cpu_on
113	.word	ARM_PSCI_FN_MIGRATE
114	.word	psci_migrate
115	.word	ARM_PSCI_0_2_FN_PSCI_VERSION
116	.word	psci_version
117	.word	ARM_PSCI_0_2_FN_CPU_SUSPEND
118	.word	psci_cpu_suspend
119	.word	ARM_PSCI_0_2_FN_CPU_OFF
120	.word	psci_cpu_off
121	.word	ARM_PSCI_0_2_FN_CPU_ON
122	.word	psci_cpu_on
123	.word	ARM_PSCI_0_2_FN_AFFINITY_INFO
124	.word	psci_affinity_info
125	.word	ARM_PSCI_0_2_FN_MIGRATE
126	.word	psci_migrate
127	.word	ARM_PSCI_0_2_FN_MIGRATE_INFO_TYPE
128	.word	psci_migrate_info_type
129	.word	ARM_PSCI_0_2_FN_MIGRATE_INFO_UP_CPU
130	.word	psci_migrate_info_up_cpu
131	.word	ARM_PSCI_0_2_FN_SYSTEM_OFF
132	.word	psci_system_off
133	.word	ARM_PSCI_0_2_FN_SYSTEM_RESET
134	.word	psci_system_reset
135	.word	ARM_PSCI_1_0_FN_PSCI_FEATURES
136	.word	psci_features
137	.word	ARM_PSCI_1_0_FN_CPU_FREEZE
138	.word	psci_cpu_freeze
139	.word	ARM_PSCI_1_0_FN_CPU_DEFAULT_SUSPEND
140	.word	psci_cpu_default_suspend
141	.word	ARM_PSCI_1_0_FN_NODE_HW_STATE
142	.word	psci_node_hw_state
143	.word	ARM_PSCI_1_0_FN_SYSTEM_SUSPEND
144	.word	psci_system_suspend
145	.word	ARM_PSCI_1_0_FN_SET_SUSPEND_MODE
146	.word	psci_set_suspend_mode
147	.word	ARM_PSCI_1_0_FN_STAT_RESIDENCY
148	.word	psi_stat_residency
149	.word	ARM_PSCI_1_0_FN_STAT_COUNT
150	.word	psci_stat_count
151	.word	0
152	.word	0
153
154_smc_psci:
155	push	{r4-r7,lr}
156
157	@ Switch to secure
158	mrc	p15, 0, r7, c1, c1, 0
159	bic	r4, r7, #1
160	mcr	p15, 0, r4, c1, c1, 0
161	isb
162
163	adr	r4, _psci_table
1641:	ldr	r5, [r4]		@ Load PSCI function ID
165	ldr	r6, [r4, #4]		@ Load target PC
166	cmp	r5, #0			@ If reach the end, bail out
167	moveq	r0, #ARM_PSCI_RET_INVAL	@ Return -2 (Invalid)
168	beq	2f
169	cmp	r0, r5			@ If not matching, try next entry
170	addne	r4, r4, #8
171	bne	1b
172
173	blx	r6			@ Execute PSCI function
174
175	@ Switch back to non-secure
1762:	mcr	p15, 0, r7, c1, c1, 0
177
178	pop	{r4-r7, lr}
179	movs	pc, lr			@ Return to the kernel
180
181@ Requires dense and single-cluster CPU ID space
182ENTRY(psci_get_cpu_id)
183	mrc	p15, 0, r0, c0, c0, 5	/* read MPIDR */
184	and	r0, r0, #0xff		/* return CPU ID in cluster */
185	bx	lr
186ENDPROC(psci_get_cpu_id)
187.weak psci_get_cpu_id
188
189/* Imported from Linux kernel */
190ENTRY(psci_v7_flush_dcache_all)
191	stmfd	sp!, {r4-r5, r7, r9-r11, lr}
192	dmb					@ ensure ordering with previous memory accesses
193	mrc	p15, 1, r0, c0, c0, 1		@ read clidr
194	ands	r3, r0, #0x7000000		@ extract loc from clidr
195	mov	r3, r3, lsr #23			@ left align loc bit field
196	beq	finished			@ if loc is 0, then no need to clean
197	mov	r10, #0				@ start clean at cache level 0
198flush_levels:
199	add	r2, r10, r10, lsr #1		@ work out 3x current cache level
200	mov	r1, r0, lsr r2			@ extract cache type bits from clidr
201	and	r1, r1, #7			@ mask of the bits for current cache only
202	cmp	r1, #2				@ see what cache we have at this level
203	blt	skip				@ skip if no cache, or just i-cache
204	mrs     r9, cpsr			@ make cssr&csidr read atomic
205	mcr	p15, 2, r10, c0, c0, 0		@ select current cache level in cssr
206	isb					@ isb to sych the new cssr&csidr
207	mrc	p15, 1, r1, c0, c0, 0		@ read the new csidr
208	msr     cpsr_c, r9
209	and	r2, r1, #7			@ extract the length of the cache lines
210	add	r2, r2, #4			@ add 4 (line length offset)
211	ldr	r4, =0x3ff
212	ands	r4, r4, r1, lsr #3		@ find maximum number on the way size
213	clz	r5, r4				@ find bit position of way size increment
214	ldr	r7, =0x7fff
215	ands	r7, r7, r1, lsr #13		@ extract max number of the index size
216loop1:
217	mov	r9, r7				@ create working copy of max index
218loop2:
219	orr	r11, r10, r4, lsl r5		@ factor way and cache number into r11
220	orr	r11, r11, r9, lsl r2		@ factor index number into r11
221	mcr	p15, 0, r11, c7, c14, 2		@ clean & invalidate by set/way
222	subs	r9, r9, #1			@ decrement the index
223	bge	loop2
224	subs	r4, r4, #1			@ decrement the way
225	bge	loop1
226skip:
227	add	r10, r10, #2			@ increment cache number
228	cmp	r3, r10
229	bgt	flush_levels
230finished:
231	mov	r10, #0				@ swith back to cache level 0
232	mcr	p15, 2, r10, c0, c0, 0		@ select current cache level in cssr
233	dsb	st
234	isb
235	ldmfd	sp!, {r4-r5, r7, r9-r11, lr}
236	bx	lr
237ENDPROC(psci_v7_flush_dcache_all)
238
239ENTRY(psci_disable_smp)
240	mrc	p15, 0, r0, c1, c0, 1		@ ACTLR
241	bic	r0, r0, #(1 << 6)		@ Clear SMP bit
242	mcr	p15, 0, r0, c1, c0, 1		@ ACTLR
243	isb
244	dsb
245	bx	lr
246ENDPROC(psci_disable_smp)
247.weak psci_disable_smp
248
249ENTRY(psci_enable_smp)
250	mrc	p15, 0, r0, c1, c0, 1		@ ACTLR
251	orr	r0, r0, #(1 << 6)		@ Set SMP bit
252	mcr	p15, 0, r0, c1, c0, 1		@ ACTLR
253	isb
254	bx	lr
255ENDPROC(psci_enable_smp)
256.weak psci_enable_smp
257
258ENTRY(psci_cpu_off_common)
259	push	{lr}
260
261	mrc	p15, 0, r0, c1, c0, 0		@ SCTLR
262	bic	r0, r0, #(1 << 2)		@ Clear C bit
263	mcr	p15, 0, r0, c1, c0, 0		@ SCTLR
264	isb
265	dsb
266
267	bl	psci_v7_flush_dcache_all
268
269	clrex					@ Why???
270
271	bl	psci_disable_smp
272
273	pop	{lr}
274	bx	lr
275ENDPROC(psci_cpu_off_common)
276
277@ The stacks are allocated in reverse order, i.e.
278@ the stack for CPU0 has the highest memory address.
279@
280@ --------------------  __secure_stack_end
281@ |  CPU0 target PC  |
282@ |------------------|
283@ |                  |
284@ |    CPU0 stack    |
285@ |                  |
286@ |------------------|  __secure_stack_end - 1KB
287@ |        .         |
288@ |        .         |
289@ |        .         |
290@ |        .         |
291@ --------------------  __secure_stack_start
292@
293@ This expects CPU ID in r0 and returns stack top in r0
294LENTRY(psci_get_cpu_stack_top)
295	@ stack top = __secure_stack_end - (cpuid << ARM_PSCI_STACK_SHIFT)
296	ldr	r3, =__secure_stack_end
297	sub	r0, r3, r0, LSL #ARM_PSCI_STACK_SHIFT
298	sub	r0, r0, #4		@ Save space for target PC
299	bx	lr
300ENDPROC(psci_get_cpu_stack_top)
301
302@ {r0, r1, r2, ip} from _do_nonsec_entry(kernel_entry, 0, machid, r2) in
303@ arch/arm/lib/bootm.c:boot_jump_linux() must remain unchanged across
304@ this function.
305ENTRY(psci_stack_setup)
306	mov	r6, lr
307	mov	r7, r0
308	bl	psci_get_cpu_id		@ CPU ID => r0
309	bl	psci_get_cpu_stack_top	@ stack top => r0
310	mov	sp, r0
311	mov	r0, r7
312	bx	r6
313ENDPROC(psci_stack_setup)
314
315ENTRY(psci_arch_init)
316	mov	pc, lr
317ENDPROC(psci_arch_init)
318.weak psci_arch_init
319
320ENTRY(psci_cpu_entry)
321	bl	psci_enable_smp
322
323	bl	_nonsec_init
324
325	bl	psci_get_cpu_id			@ CPU ID => r0
326	bl	psci_get_target_pc		@ target PC => r0
327	b	_do_nonsec_entry
328ENDPROC(psci_cpu_entry)
329
330	.popsection
331