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>
22 #include <asm/hardware/cache-l2x0.h>
30 #define PMC_SCRATCH41 0x140
32 #define RESET_DATA(x) ((TEGRA_RESET_##x)*4)
34 #ifdef CONFIG_PM_SLEEP
38 * CPU boot vector when restarting the a CPU following
39 * an LP2 transition. Also branched to by LP0 and LP1 resume after
48 tegra_get_soc_id TEGRA_APB_MISC_BASE, r6
57 /* Are we on Tegra20? */
60 /* Clear the flow controller flags for this CPU. */
62 mov32 r2, TEGRA_FLOW_CTRL_BASE
64 /* Clear event & intr flag */
66 #FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG
67 movw r0, #0x3FFD @ enable, cluster_switch, immed, bitmaps
68 @ & ext flags for CPU power mgnt
73 check_cpu_part_num 0xc09, r8, r9
75 #ifdef CONFIG_HAVE_ARM_SCU
77 mov32 r0, TEGRA_ARM_PERIF_BASE
83 /* L2 cache resume & re-enable */
84 l2_cache_resume r0, r1, r2, l2x0_saved_regs_addr
91 #ifdef CONFIG_CACHE_L2X0
92 .globl l2x0_saved_regs_addr
98 ENTRY(__tegra_cpu_reset_handler_start)
101 * __tegra_cpu_reset_handler:
103 * Common handler for all CPU reset events.
105 * Register usage within the reset handler:
109 * R7 = CPU present (to the OS) mask
110 * R8 = CPU in LP1 state mask
111 * R9 = CPU in LP2 state mask
114 * R12 = pointer to reset handler data
116 * NOTE: This code is copied to IRAM. All code and data accesses
117 * must be position-independent.
120 .align L1_CACHE_SHIFT
121 ENTRY(__tegra_cpu_reset_handler)
123 cpsid aif, 0x13 @ SVC mode, interrupts disabled
125 tegra_get_soc_id TEGRA_APB_MISC_BASE, r6
126 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
131 # Tegra20 is a Cortex-A9 r1p1
132 mrc p15, 0, r0, c1, c0, 0 @ read system control register
133 orr r0, r0, #1 << 14 @ erratum 716044
134 mcr p15, 0, r0, c1, c0, 0 @ write system control register
135 mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
136 orr r0, r0, #1 << 4 @ erratum 742230
137 orr r0, r0, #1 << 11 @ erratum 751472
138 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
142 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
147 # Tegra30 is a Cortex-A9 r2p9
148 mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
149 orr r0, r0, #1 << 6 @ erratum 743622
150 orr r0, r0, #1 << 11 @ erratum 751472
151 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
156 mrc p15, 0, r10, c0, c0, 5 @ MPIDR
157 and r10, r10, #0x3 @ R10 = CPU number
159 mov r11, r11, lsl r10 @ R11 = CPU mask
160 adr r12, __tegra_cpu_reset_handler_data
163 /* Does the OS know about this CPU? */
164 ldr r7, [r12, #RESET_DATA(MASK_PRESENT)]
165 tst r7, r11 @ if !present
166 bleq __die @ CPU not present (to OS)
169 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
170 /* Are we on Tegra20? */
173 /* If not CPU0, don't let CPU0 reset CPU1 now that CPU1 is coming up. */
174 mov32 r5, TEGRA_PMC_BASE
177 strne r0, [r5, #PMC_SCRATCH41]
181 /* Waking up from LP2? */
182 ldr r9, [r12, #RESET_DATA(MASK_LP2)]
183 tst r9, r11 @ if in_lp2
185 ldr lr, [r12, #RESET_DATA(STARTUP_LP2)]
187 bleq __die @ no LP2 startup handler
194 * Can only be secondary boot (initial or hotplug)
195 * CPU0 can't be here for Tegra20/30
200 bleq __die @ CPU0 cannot be here
202 ldr lr, [r12, #RESET_DATA(STARTUP_SECONDARY)]
204 bleq __die @ no secondary startup handler
209 * We don't know why the CPU reset. Just kill it.
210 * The LR register will contain the address we died at + 4.
215 mov32 r7, TEGRA_PMC_BASE
216 str lr, [r7, #PMC_SCRATCH41]
218 mov32 r7, TEGRA_CLK_RESET_BASE
220 /* Are we on Tegra20? */
224 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
227 str r1, [r7, #0x340] @ CLK_RST_CPU_CMPLX_SET
230 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
231 mov32 r6, TEGRA_FLOW_CTRL_BASE
234 moveq r1, #FLOW_CTRL_HALT_CPU0_EVENTS
235 moveq r2, #FLOW_CTRL_CPU0_CSR
236 movne r1, r10, lsl #3
237 addne r2, r1, #(FLOW_CTRL_CPU1_CSR-8)
238 addne r1, r1, #(FLOW_CTRL_HALT_CPU1_EVENTS-8)
240 /* Clear CPU "event" and "interrupt" flags and power gate
241 it when halting but not before it is in the "WFI" state. */
243 orr r0, r0, #FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG
244 orr r0, r0, #FLOW_CTRL_CSR_ENABLE
247 /* Unconditionally halt this CPU */
248 mov r0, #FLOW_CTRL_WAITEVENT
250 ldr r0, [r6, +r1] @ memory barrier
254 wfi @ CPU should be power gated here
256 /* If the CPU didn't power gate above just kill it's clock. */
259 str r0, [r7, #348] @ CLK_CPU_CMPLX_SET
262 /* If the CPU still isn't dead, just spin here. */
264 ENDPROC(__tegra_cpu_reset_handler)
266 .align L1_CACHE_SHIFT
267 .type __tegra_cpu_reset_handler_data, %object
268 .globl __tegra_cpu_reset_handler_data
269 __tegra_cpu_reset_handler_data:
270 .rept TEGRA_RESET_DATA_SIZE
273 .align L1_CACHE_SHIFT
275 ENTRY(__tegra_cpu_reset_handler_end)