1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * armboot - Startup Code for OMAP3530/ARM Cortex CPU-core
5 * Copyright (c) 2004 Texas Instruments <r-woodruff2@ti.com>
7 * Copyright (c) 2001 Marius Gröger <mag@sysgo.de>
8 * Copyright (c) 2002 Alex Züpke <azu@sysgo.de>
9 * Copyright (c) 2002 Gary Jennejohn <garyj@denx.de>
10 * Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com>
11 * Copyright (c) 2003 Kshitij <kshitij@ti.com>
12 * Copyright (c) 2006-2008 Syed Mohammed Khasim <x0khasim@ti.com>
15 #include <asm-offsets.h>
17 #include <asm/system.h>
18 #include <linux/linkage.h>
19 #include <asm/armv7.h>
21 /*************************************************************************
23 * Startup Code (reset vector)
25 * Do important init only if we don't start from memory!
26 * Setup memory and board specific bits prior to relocation.
27 * Relocate armboot to ram. Setup stack.
29 *************************************************************************/
32 .globl save_boot_params_ret
33 .type save_boot_params_ret,%function
34 #ifdef CONFIG_ARMV7_LPAE
35 .global switch_to_hypervisor_ret
39 /* Allow the board to save important registers */
42 #ifdef CONFIG_POSITION_INDEPENDENT
44 * Fix .rela.dyn relocations. This allows U-Boot to loaded to and
45 * executed at a different address than it was linked at.
48 adr r0, reset /* r0 <- Runtime value of reset label */
49 ldr r1, =reset /* r1 <- Linked value of reset label */
50 subs r4, r0, r1 /* r4 <- Runtime-vs-link offset */
54 ldr r1, _rel_dyn_start_ofs
55 add r2, r0, r1 /* r2 <- Runtime &__rel_dyn_start */
56 ldr r1, _rel_dyn_end_ofs
57 add r3, r0, r1 /* r3 <- Runtime &__rel_dyn_end */
60 ldr r0, [r2] /* r0 <- Link location */
61 ldr r1, [r2, #4] /* r1 <- fixup */
62 cmp r1, #23 /* relative fixup? */
65 /* relative fix: increase location by offset */
78 #ifdef CONFIG_ARMV7_LPAE
80 * check for Hypervisor support
82 mrc p15, 0, r0, c0, c1, 1 @ read ID_PFR1
83 and r0, r0, #CPUID_ARM_VIRT_MASK @ mask virtualization bits
84 cmp r0, #(1 << CPUID_ARM_VIRT_SHIFT)
85 beq switch_to_hypervisor
86 switch_to_hypervisor_ret:
89 * disable interrupts (FIQ and IRQ), also set the cpu to SVC32 mode,
90 * except if in HYP mode already
93 and r1, r0, #0x1f @ mask mode bits
94 teq r1, #0x1a @ test for HYP mode
95 bicne r0, r0, #0x1f @ clear all mode bits
96 orrne r0, r0, #0x13 @ set SVC mode
97 orr r0, r0, #0xc0 @ disable FIQ and IRQ
100 #if !CONFIG_IS_ENABLED(SYS_NO_VECTOR_TABLE)
104 /* Set V=0 in CP15 SCTLR register - for VBAR to point to vector */
105 mrc p15, 0, r0, c1, c0, 0 @ Read CP15 SCTLR Register
106 bic r0, #CR_V @ V = 0
107 mcr p15, 0, r0, c1, c0, 0 @ Write CP15 SCTLR Register
109 #ifdef CONFIG_HAS_VBAR
110 /* Set vector address in CP15 VBAR register */
112 mcr p15, 0, r0, c12, c0, 0 @Set VBAR
116 /* the mask ROM code should have PLL and others stable */
117 #if !CONFIG_IS_ENABLED(SKIP_LOWLEVEL_INIT)
118 #ifdef CONFIG_CPU_V7A
121 #if !CONFIG_IS_ENABLED(SKIP_LOWLEVEL_INIT_ONLY)
128 /*------------------------------------------------------------------------------*/
130 ENTRY(c_runtime_cpu_setup)
132 * If I-cache is enabled invalidate it
134 #if !CONFIG_IS_ENABLED(SYS_ICACHE_OFF)
135 mcr p15, 0, r0, c7, c5, 0 @ invalidate icache
136 mcr p15, 0, r0, c7, c10, 4 @ DSB
137 mcr p15, 0, r0, c7, c5, 4 @ ISB
142 ENDPROC(c_runtime_cpu_setup)
144 /*************************************************************************
146 * void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3)
147 * __attribute__((weak));
149 * Stack pointer is not yet initialized at this moment
150 * Don't save anything to stack even if compiled with -O0
152 *************************************************************************/
153 ENTRY(save_boot_params)
154 b save_boot_params_ret @ back to my caller
155 ENDPROC(save_boot_params)
156 .weak save_boot_params
158 #ifdef CONFIG_ARMV7_LPAE
159 ENTRY(switch_to_hypervisor)
160 b switch_to_hypervisor_ret
161 ENDPROC(switch_to_hypervisor)
162 .weak switch_to_hypervisor
165 /*************************************************************************
169 * Setup CP15 registers (cache, MMU, TLBs). The I-cache is turned on unless
170 * CONFIG_SYS_ICACHE_OFF is defined.
172 *************************************************************************/
175 #if CONFIG_IS_ENABLED(ARMV7_SET_CORTEX_SMPEN)
177 * The Arm Cortex-A7 TRM says this bit must be enabled before
178 * "any cache or TLB maintenance operations are performed".
180 mrc p15, 0, r0, c1, c0, 1 @ read auxilary control register
181 orr r0, r0, #1 << 6 @ set SMP bit to enable coherency
182 mcr p15, 0, r0, c1, c0, 1 @ write auxilary control register
188 mov r0, #0 @ set up for MCR
189 mcr p15, 0, r0, c8, c7, 0 @ invalidate TLBs
190 mcr p15, 0, r0, c7, c5, 0 @ invalidate icache
191 mcr p15, 0, r0, c7, c5, 6 @ invalidate BP array
192 mcr p15, 0, r0, c7, c10, 4 @ DSB
193 mcr p15, 0, r0, c7, c5, 4 @ ISB
196 * disable MMU stuff and caches
198 mrc p15, 0, r0, c1, c0, 0
199 bic r0, r0, #0x00002000 @ clear bits 13 (--V-)
200 bic r0, r0, #0x00000007 @ clear bits 2:0 (-CAM)
201 orr r0, r0, #0x00000002 @ set bit 1 (--A-) Align
202 orr r0, r0, #0x00000800 @ set bit 11 (Z---) BTB
203 #if CONFIG_IS_ENABLED(SYS_ICACHE_OFF)
204 bic r0, r0, #0x00001000 @ clear bit 12 (I) I-cache
206 orr r0, r0, #0x00001000 @ set bit 12 (I) I-cache
208 mcr p15, 0, r0, c1, c0, 0
210 #ifdef CONFIG_ARM_ERRATA_716044
211 mrc p15, 0, r0, c1, c0, 0 @ read system control register
212 orr r0, r0, #1 << 11 @ set bit #11
213 mcr p15, 0, r0, c1, c0, 0 @ write system control register
216 #if (defined(CONFIG_ARM_ERRATA_742230) || defined(CONFIG_ARM_ERRATA_794072))
217 mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
218 orr r0, r0, #1 << 4 @ set bit #4
219 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
222 #ifdef CONFIG_ARM_ERRATA_743622
223 mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
224 orr r0, r0, #1 << 6 @ set bit #6
225 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
228 #ifdef CONFIG_ARM_ERRATA_751472
229 mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
230 orr r0, r0, #1 << 11 @ set bit #11
231 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
233 #ifdef CONFIG_ARM_ERRATA_761320
234 mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
235 orr r0, r0, #1 << 21 @ set bit #21
236 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
239 #ifdef CONFIG_ARM_ERRATA_845369
240 mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
241 orr r0, r0, #1 << 22 @ set bit #22
242 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
245 mov r5, lr @ Store my Caller
246 mrc p15, 0, r1, c0, c0, 0 @ r1 has Read Main ID Register (MIDR)
247 mov r3, r1, lsr #20 @ get variant field
248 and r3, r3, #0xf @ r3 has CPU variant
249 and r4, r1, #0xf @ r4 has CPU revision
250 mov r2, r3, lsl #4 @ shift variant field for combined value
251 orr r2, r4, r2 @ r2 has combined CPU variant + revision
253 /* Early stack for ERRATA that needs into call C code */
254 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK)
255 ldr r0, =(CONFIG_SPL_STACK)
257 ldr r0, =(CONFIG_SYS_INIT_SP_ADDR)
259 bic r0, r0, #7 /* 8-byte alignment for ABI compliance */
262 #ifdef CONFIG_ARM_ERRATA_798870
263 cmp r2, #0x30 @ Applies to lower than R3p0
264 bge skip_errata_798870 @ skip if not affected rev
265 cmp r2, #0x20 @ Applies to including and above R2p0
266 blt skip_errata_798870 @ skip if not affected rev
268 mrc p15, 1, r0, c15, c0, 0 @ read l2 aux ctrl reg
269 orr r0, r0, #1 << 7 @ Enable hazard-detect timeout
270 push {r1-r5} @ Save the cpu info registers
271 bl v7_arch_cp15_set_l2aux_ctrl
272 isb @ Recommended ISB after l2actlr update
273 pop {r1-r5} @ Restore the cpu info - fall through
277 #ifdef CONFIG_ARM_ERRATA_801819
278 cmp r2, #0x24 @ Applies to lt including R2p4
279 bgt skip_errata_801819 @ skip if not affected rev
280 cmp r2, #0x20 @ Applies to including and above R2p0
281 blt skip_errata_801819 @ skip if not affected rev
282 mrc p15, 0, r0, c0, c0, 6 @ pick up REVIDR reg
283 and r0, r0, #1 << 3 @ check REVIDR[3]
285 beq skip_errata_801819 @ skip erratum if REVIDR[3] is set
287 mrc p15, 0, r0, c1, c0, 1 @ read auxilary control register
288 orr r0, r0, #3 << 27 @ Disables streaming. All write-allocate
289 @ lines allocate in the L1 or L2 cache.
290 orr r0, r0, #3 << 25 @ Disables streaming. All write-allocate
291 @ lines allocate in the L1 cache.
292 push {r1-r5} @ Save the cpu info registers
293 bl v7_arch_cp15_set_acr
294 pop {r1-r5} @ Restore the cpu info - fall through
298 #ifdef CONFIG_ARM_CORTEX_A15_CVE_2017_5715
299 mrc p15, 0, r0, c1, c0, 1 @ read auxilary control register
300 orr r0, r0, #1 << 0 @ Enable invalidates of BTB
301 push {r1-r5} @ Save the cpu info registers
302 bl v7_arch_cp15_set_acr
303 pop {r1-r5} @ Restore the cpu info - fall through
306 #ifdef CONFIG_ARM_ERRATA_454179
307 mrc p15, 0, r0, c1, c0, 1 @ Read ACR
309 cmp r2, #0x21 @ Only on < r2p1
310 orrlt r0, r0, #(0x3 << 6) @ Set DBSM(BIT7) and IBE(BIT6) bits
312 push {r1-r5} @ Save the cpu info registers
313 bl v7_arch_cp15_set_acr
314 pop {r1-r5} @ Restore the cpu info - fall through
317 #if defined(CONFIG_ARM_ERRATA_430973) || defined (CONFIG_ARM_CORTEX_A8_CVE_2017_5715)
318 mrc p15, 0, r0, c1, c0, 1 @ Read ACR
320 #ifdef CONFIG_ARM_CORTEX_A8_CVE_2017_5715
321 orr r0, r0, #(0x1 << 6) @ Set IBE bit always to enable OS WA
323 cmp r2, #0x21 @ Only on < r2p1
324 orrlt r0, r0, #(0x1 << 6) @ Set IBE bit
326 push {r1-r5} @ Save the cpu info registers
327 bl v7_arch_cp15_set_acr
328 pop {r1-r5} @ Restore the cpu info - fall through
331 #ifdef CONFIG_ARM_ERRATA_621766
332 mrc p15, 0, r0, c1, c0, 1 @ Read ACR
334 cmp r2, #0x21 @ Only on < r2p1
335 orrlt r0, r0, #(0x1 << 5) @ Set L1NEON bit
337 push {r1-r5} @ Save the cpu info registers
338 bl v7_arch_cp15_set_acr
339 pop {r1-r5} @ Restore the cpu info - fall through
342 #ifdef CONFIG_ARM_ERRATA_725233
343 mrc p15, 1, r0, c9, c0, 2 @ Read L2ACR
345 cmp r2, #0x21 @ Only on < r2p1 (Cortex A8)
346 orrlt r0, r0, #(0x1 << 27) @ L2 PLD data forwarding disable
348 push {r1-r5} @ Save the cpu info registers
349 bl v7_arch_cp15_set_l2aux_ctrl
350 pop {r1-r5} @ Restore the cpu info - fall through
353 #ifdef CONFIG_ARM_ERRATA_852421
354 mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
355 orr r0, r0, #1 << 24 @ set bit #24
356 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
359 #ifdef CONFIG_ARM_ERRATA_852423
360 mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
361 orr r0, r0, #1 << 12 @ set bit #12
362 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
365 mov pc, r5 @ back to my caller
366 ENDPROC(cpu_init_cp15)
368 #if !CONFIG_IS_ENABLED(SKIP_LOWLEVEL_INIT) && \
369 !CONFIG_IS_ENABLED(SKIP_LOWLEVEL_INIT_ONLY)
370 /*************************************************************************
372 * CPU_init_critical registers
374 * setup important registers
375 * setup memory timing
377 *************************************************************************/
380 * Jump to board specific initialization...
381 * The Mask ROM will have already initialized
382 * basic memory. Go here to bump up clock rate and handle
383 * wake up conditions.
385 b lowlevel_init @ go setup pll,mux,memory
386 ENDPROC(cpu_init_crit)
389 #if CONFIG_POSITION_INDEPENDENT
391 .word __rel_dyn_start - pie_fixup
393 .word __rel_dyn_end - pie_fixup