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kernel/linux-imx6_3.14.28/arch/arm/mach-imx/ssi-fiq.S 2.94 KB
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6b13f685e   김민수   BSP 최초 추가 
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  /*
   *  Copyright (C) 2009 Sascha Hauer <s.hauer@pengutronix.de>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  #include <linux/linkage.h>
  #include <asm/assembler.h>
  
  /*
   * r8  = bit 0-15: tx offset, bit 16-31: tx buffer size
   * r9  = bit 0-15: rx offset, bit 16-31: rx buffer size
   */
  
  #define SSI_STX0	0x00
  #define SSI_SRX0	0x08
  #define SSI_SISR	0x14
  #define SSI_SIER	0x18
  #define SSI_SACNT	0x38
  
  #define SSI_SACNT_AC97EN	(1 << 0)
  
  #define SSI_SIER_TFE0_EN	(1 << 0)
  #define SSI_SISR_TFE0		(1 << 0)
  #define SSI_SISR_RFF0		(1 << 2)
  #define SSI_SIER_RFF0_EN	(1 << 2)
  
  		.text
  		.global	imx_ssi_fiq_start
  		.global	imx_ssi_fiq_end
  		.global imx_ssi_fiq_base
  		.global imx_ssi_fiq_rx_buffer
  		.global imx_ssi_fiq_tx_buffer
  
  /*
   * imx_ssi_fiq_start is _intentionally_ not marked as a function symbol
   * using ENDPROC().  imx_ssi_fiq_start and imx_ssi_fiq_end are used to
   * mark the function body so that it can be copied to the FIQ vector in
   * the vectors page.  imx_ssi_fiq_start should only be called as the result
   * of an FIQ: calling it directly will not work.
   */
  imx_ssi_fiq_start:
  		ldr r12, .L_imx_ssi_fiq_base
  
  		/* TX */
  		ldr r13, .L_imx_ssi_fiq_tx_buffer
  
  		/* shall we send? */
  		ldr r11, [r12, #SSI_SIER]
  		tst r11, #SSI_SIER_TFE0_EN
  		beq 1f
  
  		/* TX FIFO empty? */
  		ldr r11, [r12, #SSI_SISR]
  		tst r11, #SSI_SISR_TFE0
  		beq 1f
  
  		mov r10, #0x10000
  		sub r10, #1
  		and r10, r10, r8	/* r10: current buffer offset */
  
  		add r13, r13, r10
  
  		ldrh r11, [r13]
  		strh r11, [r12, #SSI_STX0]
  
  		ldrh r11, [r13, #2]
  		strh r11, [r12, #SSI_STX0]
  
  		ldrh r11, [r13, #4]
  		strh r11, [r12, #SSI_STX0]
  
  		ldrh r11, [r13, #6]
  		strh r11, [r12, #SSI_STX0]
  
  		add r10, #8
  		lsr r11, r8, #16	/* r11: buffer size */
  		cmp r10, r11
  		lslgt r8, r11, #16
  		addle r8, #8
  1:
  		/* RX */
  
  		/* shall we receive? */
  		ldr r11, [r12, #SSI_SIER]
  		tst r11, #SSI_SIER_RFF0_EN
  		beq 1f
  
  		/* RX FIFO full? */
  		ldr r11, [r12, #SSI_SISR]
  		tst r11, #SSI_SISR_RFF0
  		beq 1f
  
  		ldr r13, .L_imx_ssi_fiq_rx_buffer
  
  		mov r10, #0x10000
  		sub r10, #1
  		and r10, r10, r9	/* r10: current buffer offset */
  
  		add r13, r13, r10
  
  		ldr r11, [r12, #SSI_SACNT]
  		tst r11, #SSI_SACNT_AC97EN
  
  		ldr r11, [r12, #SSI_SRX0]
  		strh r11, [r13]
  
  		ldr r11, [r12, #SSI_SRX0]
  		strh r11, [r13, #2]
  
  		/* dummy read to skip slot 12 */
  		ldrne r11, [r12, #SSI_SRX0]
  
  		ldr r11, [r12, #SSI_SRX0]
  		strh r11, [r13, #4]
  
  		ldr r11, [r12, #SSI_SRX0]
  		strh r11, [r13, #6]
  
  		/* dummy read to skip slot 12 */
  		ldrne r11, [r12, #SSI_SRX0]
  
  		add r10, #8
  		lsr r11, r9, #16	/* r11: buffer size */
  		cmp r10, r11
  		lslgt r9, r11, #16
  		addle r9, #8
  
  1:
  		@ return from FIQ
  		subs	pc, lr, #4
  
  		.align
  .L_imx_ssi_fiq_base:
  imx_ssi_fiq_base:
  		.word 0x0
  .L_imx_ssi_fiq_rx_buffer:
  imx_ssi_fiq_rx_buffer:
  		.word 0x0
  .L_imx_ssi_fiq_tx_buffer:
  imx_ssi_fiq_tx_buffer:
  		.word 0x0
  .L_imx_ssi_fiq_end:
  imx_ssi_fiq_end: