2 * Copyright (c) 2012, NVIDIA Corporation. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 #include <linux/linkage.h>
18 #include <linux/init.h>
20 #include <asm/cache.h>
21 #include <asm/asm-offsets.h>
29 #define PMC_SCRATCH41 0x140
31 #define RESET_DATA(x) ((TEGRA_RESET_##x)*4)
33 #ifdef CONFIG_PM_SLEEP
37 * CPU boot vector when restarting the a CPU following
38 * an LP2 transition. Also branched to by LP0 and LP1 resume after
45 check_cpu_part_num 0xc09, r8, r9
53 /* Are we on Tegra20? */
56 /* Clear the flow controller flags for this CPU. */
58 mov32 r2, TEGRA_FLOW_CTRL_BASE
60 /* Clear event & intr flag */
62 #FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG
63 movw r0, #0x3FFD @ enable, cluster_switch, immed, bitmaps
64 @ & ext flags for CPU power mgnt
71 bne end_ca9_scu_l2_resume
72 #ifdef CONFIG_HAVE_ARM_SCU
74 mov32 r0, TEGRA_ARM_PERIF_BASE
80 #ifdef CONFIG_CACHE_L2X0
81 /* L2 cache resume & re-enable */
82 bl l2c310_early_resume
84 end_ca9_scu_l2_resume:
87 bleq tegra_init_l2_for_a15
94 ENTRY(__tegra_cpu_reset_handler_start)
97 * __tegra_cpu_reset_handler:
99 * Common handler for all CPU reset events.
101 * Register usage within the reset handler:
105 * R7 = CPU present (to the OS) mask
106 * R8 = CPU in LP1 state mask
107 * R9 = CPU in LP2 state mask
110 * R12 = pointer to reset handler data
112 * NOTE: This code is copied to IRAM. All code and data accesses
113 * must be position-independent.
116 .align L1_CACHE_SHIFT
117 ENTRY(__tegra_cpu_reset_handler)
119 cpsid aif, 0x13 @ SVC mode, interrupts disabled
121 tegra_get_soc_id TEGRA_APB_MISC_BASE, r6
122 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
127 # Tegra20 is a Cortex-A9 r1p1
128 mrc p15, 0, r0, c1, c0, 0 @ read system control register
129 orr r0, r0, #1 << 14 @ erratum 716044
130 mcr p15, 0, r0, c1, c0, 0 @ write system control register
131 mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
132 orr r0, r0, #1 << 4 @ erratum 742230
133 orr r0, r0, #1 << 11 @ erratum 751472
134 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
138 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
143 # Tegra30 is a Cortex-A9 r2p9
144 mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
145 orr r0, r0, #1 << 6 @ erratum 743622
146 orr r0, r0, #1 << 11 @ erratum 751472
147 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
152 mrc p15, 0, r10, c0, c0, 5 @ MPIDR
153 and r10, r10, #0x3 @ R10 = CPU number
155 mov r11, r11, lsl r10 @ R11 = CPU mask
156 adr r12, __tegra_cpu_reset_handler_data
159 /* Does the OS know about this CPU? */
160 ldr r7, [r12, #RESET_DATA(MASK_PRESENT)]
161 tst r7, r11 @ if !present
162 bleq __die @ CPU not present (to OS)
165 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
166 /* Are we on Tegra20? */
169 /* If not CPU0, don't let CPU0 reset CPU1 now that CPU1 is coming up. */
170 mov32 r5, TEGRA_PMC_BASE
173 strne r0, [r5, #PMC_SCRATCH41]
177 /* Waking up from LP1? */
178 ldr r8, [r12, #RESET_DATA(MASK_LP1)]
179 tst r8, r11 @ if in_lp1
182 bne __die @ only CPU0 can be here
183 ldr lr, [r12, #RESET_DATA(STARTUP_LP1)]
185 bleq __die @ no LP1 startup handler
186 THUMB( add lr, lr, #1 ) @ switch to Thumb mode
190 /* Waking up from LP2? */
191 ldr r9, [r12, #RESET_DATA(MASK_LP2)]
192 tst r9, r11 @ if in_lp2
194 ldr lr, [r12, #RESET_DATA(STARTUP_LP2)]
196 bleq __die @ no LP2 startup handler
203 * Can only be secondary boot (initial or hotplug)
204 * CPU0 can't be here for Tegra20/30
209 bleq __die @ CPU0 cannot be here
211 ldr lr, [r12, #RESET_DATA(STARTUP_SECONDARY)]
213 bleq __die @ no secondary startup handler
218 * We don't know why the CPU reset. Just kill it.
219 * The LR register will contain the address we died at + 4.
224 mov32 r7, TEGRA_PMC_BASE
225 str lr, [r7, #PMC_SCRATCH41]
227 mov32 r7, TEGRA_CLK_RESET_BASE
229 /* Are we on Tegra20? */
233 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
236 str r1, [r7, #0x340] @ CLK_RST_CPU_CMPLX_SET
239 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
240 mov32 r6, TEGRA_FLOW_CTRL_BASE
243 moveq r1, #FLOW_CTRL_HALT_CPU0_EVENTS
244 moveq r2, #FLOW_CTRL_CPU0_CSR
245 movne r1, r10, lsl #3
246 addne r2, r1, #(FLOW_CTRL_CPU1_CSR-8)
247 addne r1, r1, #(FLOW_CTRL_HALT_CPU1_EVENTS-8)
249 /* Clear CPU "event" and "interrupt" flags and power gate
250 it when halting but not before it is in the "WFI" state. */
252 orr r0, r0, #FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG
253 orr r0, r0, #FLOW_CTRL_CSR_ENABLE
256 /* Unconditionally halt this CPU */
257 mov r0, #FLOW_CTRL_WAITEVENT
259 ldr r0, [r6, +r1] @ memory barrier
263 wfi @ CPU should be power gated here
265 /* If the CPU didn't power gate above just kill it's clock. */
268 str r0, [r7, #348] @ CLK_CPU_CMPLX_SET
271 /* If the CPU still isn't dead, just spin here. */
273 ENDPROC(__tegra_cpu_reset_handler)
275 .align L1_CACHE_SHIFT
276 .type __tegra_cpu_reset_handler_data, %object
277 .globl __tegra_cpu_reset_handler_data
278 __tegra_cpu_reset_handler_data:
279 .rept TEGRA_RESET_DATA_SIZE
282 .align L1_CACHE_SHIFT
284 ENTRY(__tegra_cpu_reset_handler_end)