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mach-shmobile
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entry-macro.S

entry-macro.S 2.0 KB
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  1. /*
    2. 

  2.  * Copyright (C) 2010 Magnus Damm
    3. 

  3.  * Copyright (C) 2008 Renesas Solutions Corp.
    4. 

  4.  *
    5. 

  5.  * This program is free software; you can redistribute it and/or modify
    6. 

  6.  * it under the terms of the GNU General Public License as published by
    7. 

  7.  * the Free Software Foundation; version 2 of the License.
    8. 

  8.  *
    9. 

  9.  * This program is distributed in the hope that it will be useful,
    10. 

  10.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    11. 

  11.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    12. 

  12.  * GNU General Public License for more details.
    13. 

  13.  *
    14. 

  14.  * You should have received a copy of the GNU General Public License
    15. 

  15.  * along with this program; if not, write to the Free Software
    16. 

  16.  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    17. 

  17.  */
    18. 

  18. #include <mach/irqs.h>
    19. 

  19. 

  20. #define INTCA_BASE	0xe6980000
    21. 

  21. #define INTFLGA_OFFS	0x00000018 /* accept pending interrupt */
    22. 

  22. #define INTEVTA_OFFS	0x00000020 /* vector number of accepted interrupt */
    23. 

  23. #define INTLVLA_OFFS	0x00000030 /* priority level of accepted interrupt */
    24. 

  24. #define INTLVLB_OFFS	0x00000034 /* previous priority level */
    25. 

  25. 

  26. 	.macro  disable_fiq
    27. 

  27. 	.endm
    28. 

  28. 

  29. 	.macro  get_irqnr_preamble, base, tmp
    30. 

  30. 	ldr     \base, =INTCA_BASE
    31. 

  31. 	.endm
    32. 

  32. 

  33. 	.macro  arch_ret_to_user, tmp1, tmp2
    34. 

  34. 	.endm
    35. 

  35. 

  36. 	.macro  get_irqnr_and_base, irqnr, irqstat, base, tmp
    37. 

  37. 	/* The single INTFLGA read access below results in the following:
    38. 

  38. 	 *
    39. 

  39. 	 * 1. INTLVLB is updated with old priority value from INTLVLA
    40. 

  40. 	 * 2. Highest priority interrupt is accepted
    41. 

  41. 	 * 3. INTLVLA is updated to contain priority of accepted interrupt
    42. 

  42. 	 * 4. Accepted interrupt vector is stored in INTFLGA and INTEVTA
    43. 

  43. 	 */
    44. 

  44. 	ldr     \irqnr, [\base, #INTFLGA_OFFS]
    45. 

  45. 

  46. 	/* Restore INTLVLA with the value saved in INTLVLB.
    47. 

  47. 	 * This is required to support interrupt priorities properly.
    48. 

  48. 	 */
    49. 

  49. 	ldrb	\tmp, [\base, #INTLVLB_OFFS]
    50. 

  50. 	strb    \tmp, [\base, #INTLVLA_OFFS]
    51. 

  51. 

  52. 	/* Handle invalid vector number case */
    53. 

  53. 	cmp	\irqnr, #0
    54. 

  54. 	beq	1000f
    55. 

  55. 

  56. 	/* Convert vector to irq number, same as the evt2irq() macro */
    57. 

  57. 	lsr	\irqnr, \irqnr, #0x5
    58. 

  58. 	subs	\irqnr, \irqnr, #16
    59. 

  59. 

  60. 1000:
    61. 

  61. 	.endm
    62.