1 #include <linux/linkage.h>
2 #include <linux/init.h>
11 #define APB_MISC_GP_HIDREV 0x804
12 #define PMC_SCRATCH41 0x140
14 #define RESET_DATA(x) ((TEGRA_RESET_##x)*4)
16 .section ".text.head", "ax"
20 * Tegra specific entry point for secondary CPUs.
21 * The secondary kernel init calls v7_flush_dcache_all before it enables
22 * the L1; however, the L1 comes out of reset in an undefined state, so
23 * the clean + invalidate performed by v7_flush_dcache_all causes a bunch
24 * of cache lines with uninitialized data and uninitialized tags to get
25 * written out to memory, which does really unpleasant things to the main
26 * processor. We fix this by performing an invalidate, rather than a
27 * clean + invalidate, before jumping into the kernel.
29 ENTRY(v7_invalidate_l1)
31 mcr p15, 2, r0, c0, c0, 0
32 mrc p15, 1, r0, c0, c0, 0
35 and r2, r1, r0, lsr #13
39 and r3, r1, r0, lsr #3 @ NumWays - 1
40 add r2, r2, #1 @ NumSets
43 add r0, r0, #4 @ SetShift
46 add r4, r3, #1 @ NumWays
47 1: sub r2, r2, #1 @ NumSets--
48 mov r3, r4 @ Temp = NumWays
49 2: subs r3, r3, #1 @ Temp--
52 orr r5, r5, r6 @ Reg = (Temp<<WayShift)|(NumSets<<SetShift)
53 mcr p15, 0, r5, c7, c6, 2
60 ENDPROC(v7_invalidate_l1)
63 ENTRY(tegra_secondary_startup)
65 /* Enable coresight */
67 mcr p14, 0, r0, c7, c12, 6
69 ENDPROC(tegra_secondary_startup)
71 #ifdef CONFIG_PM_SLEEP
75 * CPU boot vector when restarting the a CPU following
76 * an LP2 transition. Also branched to by LP0 and LP1 resume after
81 /* Enable coresight */
83 mcr p14, 0, r0, c7, c12, 6
89 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
90 /* Are we on Tegra20? */
91 mov32 r6, TEGRA_APB_MISC_BASE
92 ldr r0, [r6, #APB_MISC_GP_HIDREV]
96 /* Clear the flow controller flags for this CPU. */
97 mov32 r2, TEGRA_FLOW_CTRL_BASE + FLOW_CTRL_CPU0_CSR @ CPU0 CSR
99 /* Clear event & intr flag */
101 #FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG
102 movw r0, #0x0FFD @ enable, cluster_switch, immed, & bitmaps
108 #ifdef CONFIG_HAVE_ARM_SCU
110 mov32 r0, TEGRA_ARM_PERIF_BASE
117 ENDPROC(tegra_resume)
120 .align L1_CACHE_SHIFT
121 ENTRY(__tegra_cpu_reset_handler_start)
124 * __tegra_cpu_reset_handler:
126 * Common handler for all CPU reset events.
128 * Register usage within the reset handler:
130 * R7 = CPU present (to the OS) mask
131 * R8 = CPU in LP1 state mask
132 * R9 = CPU in LP2 state mask
135 * R12 = pointer to reset handler data
137 * NOTE: This code is copied to IRAM. All code and data accesses
138 * must be position-independent.
141 .align L1_CACHE_SHIFT
142 ENTRY(__tegra_cpu_reset_handler)
144 cpsid aif, 0x13 @ SVC mode, interrupts disabled
145 mrc p15, 0, r10, c0, c0, 5 @ MPIDR
146 and r10, r10, #0x3 @ R10 = CPU number
148 mov r11, r11, lsl r10 @ R11 = CPU mask
149 adr r12, __tegra_cpu_reset_handler_data
152 /* Does the OS know about this CPU? */
153 ldr r7, [r12, #RESET_DATA(MASK_PRESENT)]
154 tst r7, r11 @ if !present
155 bleq __die @ CPU not present (to OS)
158 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
159 /* Are we on Tegra20? */
160 mov32 r6, TEGRA_APB_MISC_BASE
161 ldr r0, [r6, #APB_MISC_GP_HIDREV]
165 /* If not CPU0, don't let CPU0 reset CPU1 now that CPU1 is coming up. */
166 mov32 r6, TEGRA_PMC_BASE
169 strne r0, [r6, #PMC_SCRATCH41]
173 /* Waking up from LP2? */
174 ldr r9, [r12, #RESET_DATA(MASK_LP2)]
175 tst r9, r11 @ if in_lp2
177 ldr lr, [r12, #RESET_DATA(STARTUP_LP2)]
179 bleq __die @ no LP2 startup handler
186 * Can only be secondary boot (initial or hotplug) but CPU 0
190 bleq __die @ CPU0 cannot be here
191 ldr lr, [r12, #RESET_DATA(STARTUP_SECONDARY)]
193 bleq __die @ no secondary startup handler
198 * We don't know why the CPU reset. Just kill it.
199 * The LR register will contain the address we died at + 4.
204 mov32 r7, TEGRA_PMC_BASE
205 str lr, [r7, #PMC_SCRATCH41]
207 mov32 r7, TEGRA_CLK_RESET_BASE
209 /* Are we on Tegra20? */
210 mov32 r6, TEGRA_APB_MISC_BASE
211 ldr r0, [r6, #APB_MISC_GP_HIDREV]
216 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
219 str r1, [r7, #0x340] @ CLK_RST_CPU_CMPLX_SET
222 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
223 mov32 r6, TEGRA_FLOW_CTRL_BASE
226 moveq r1, #FLOW_CTRL_HALT_CPU0_EVENTS
227 moveq r2, #FLOW_CTRL_CPU0_CSR
228 movne r1, r10, lsl #3
229 addne r2, r1, #(FLOW_CTRL_CPU1_CSR-8)
230 addne r1, r1, #(FLOW_CTRL_HALT_CPU1_EVENTS-8)
232 /* Clear CPU "event" and "interrupt" flags and power gate
233 it when halting but not before it is in the "WFI" state. */
235 orr r0, r0, #FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG
236 orr r0, r0, #FLOW_CTRL_CSR_ENABLE
239 /* Unconditionally halt this CPU */
240 mov r0, #FLOW_CTRL_WAITEVENT
242 ldr r0, [r6, +r1] @ memory barrier
246 wfi @ CPU should be power gated here
248 /* If the CPU didn't power gate above just kill it's clock. */
251 str r0, [r7, #348] @ CLK_CPU_CMPLX_SET
254 /* If the CPU still isn't dead, just spin here. */
256 ENDPROC(__tegra_cpu_reset_handler)
258 .align L1_CACHE_SHIFT
259 .type __tegra_cpu_reset_handler_data, %object
260 .globl __tegra_cpu_reset_handler_data
261 __tegra_cpu_reset_handler_data:
262 .rept TEGRA_RESET_DATA_SIZE
265 .align L1_CACHE_SHIFT
267 ENTRY(__tegra_cpu_reset_handler_end)