arch/arm/mach-imx/headsmp.S

   1 /*
   2  * Copyright 2011 Freescale Semiconductor, Inc.
   3  * Copyright 2011 Linaro Ltd.
   4  *
   5  * The code contained herein is licensed under the GNU General Public
   6  * License. You may obtain a copy of the GNU General Public License
   7  * Version 2 or later at the following locations:
   8  *
   9  * http://www.opensource.org/licenses/gpl-license.html
  10  * http://www.gnu.org/copyleft/gpl.html
  11  */
  12
  13 #include <linux/linkage.h>
  14 #include <linux/init.h>
  15 #include <asm/asm-offsets.h>
  16 #include <asm/hardware/cache-l2x0.h>
  17
  18         .section ".text.head", "ax"
  19
  20 #ifdef CONFIG_SMP
  21 ENTRY(v7_secondary_startup)
  22         bl      v7_invalidate_l1
  23         b       secondary_startup
  24 ENDPROC(v7_secondary_startup)
  25 #endif
  26
  27 #ifdef CONFIG_ARM_CPU_SUSPEND
  28 /*
  29  * The following code must assume it is running from physical address
  30  * where absolute virtual addresses to the data section have to be
  31  * turned into relative ones.
  32  */
  33
  34 #ifdef CONFIG_CACHE_L2X0
  35         .macro  pl310_resume
  36         adr     r0, l2x0_saved_regs_offset
  37         ldr     r2, [r0]
  38         add     r2, r2, r0
  39         ldr     r0, [r2, #L2X0_R_PHY_BASE]      @ get physical base of l2x0
  40         ldr     r1, [r2, #L2X0_R_AUX_CTRL]      @ get aux_ctrl value
  41         str     r1, [r0, #L2X0_AUX_CTRL]        @ restore aux_ctrl
  42         mov     r1, #0x1
  43         str     r1, [r0, #L2X0_CTRL]            @ re-enable L2
  44         .endm
  45
  46 l2x0_saved_regs_offset:
  47         .word   l2x0_saved_regs - .
  48
  49 #else
  50         .macro  pl310_resume
  51         .endm
  52 #endif
  53
  54 ENTRY(v7_cpu_resume)
  55         bl      v7_invalidate_l1
  56         pl310_resume
  57         b       cpu_resume
  58 ENDPROC(v7_cpu_resume)
  59 #endif