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@@ -34,91 +34,98 @@
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.global imx_ssi_fiq_rx_buffer
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.global imx_ssi_fiq_tx_buffer
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+/*
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+ * imx_ssi_fiq_start is _intentionally_ not marked as a function symbol
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+ * using ENDPROC(). imx_ssi_fiq_start and imx_ssi_fiq_end are used to
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+ * mark the function body so that it can be copied to the FIQ vector in
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+ * the vectors page. imx_ssi_fiq_start should only be called as the result
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+ * of an FIQ: calling it directly will not work.
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+ */
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imx_ssi_fiq_start:
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- ldr r12, imx_ssi_fiq_base
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+ ldr r12, .L_imx_ssi_fiq_base
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/* TX */
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- ldr r11, imx_ssi_fiq_tx_buffer
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+ ldr r13, .L_imx_ssi_fiq_tx_buffer
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/* shall we send? */
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- ldr r13, [r12, #SSI_SIER]
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- tst r13, #SSI_SIER_TFE0_EN
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+ ldr r11, [r12, #SSI_SIER]
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+ tst r11, #SSI_SIER_TFE0_EN
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beq 1f
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/* TX FIFO empty? */
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- ldr r13, [r12, #SSI_SISR]
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- tst r13, #SSI_SISR_TFE0
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+ ldr r11, [r12, #SSI_SISR]
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+ tst r11, #SSI_SISR_TFE0
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beq 1f
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mov r10, #0x10000
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sub r10, #1
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and r10, r10, r8 /* r10: current buffer offset */
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- add r11, r11, r10
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+ add r13, r13, r10
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- ldrh r13, [r11]
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- strh r13, [r12, #SSI_STX0]
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+ ldrh r11, [r13]
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+ strh r11, [r12, #SSI_STX0]
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- ldrh r13, [r11, #2]
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- strh r13, [r12, #SSI_STX0]
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+ ldrh r11, [r13, #2]
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+ strh r11, [r12, #SSI_STX0]
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- ldrh r13, [r11, #4]
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- strh r13, [r12, #SSI_STX0]
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+ ldrh r11, [r13, #4]
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+ strh r11, [r12, #SSI_STX0]
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- ldrh r13, [r11, #6]
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- strh r13, [r12, #SSI_STX0]
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+ ldrh r11, [r13, #6]
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+ strh r11, [r12, #SSI_STX0]
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add r10, #8
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- lsr r13, r8, #16 /* r13: buffer size */
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- cmp r10, r13
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- lslgt r8, r13, #16
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+ lsr r11, r8, #16 /* r11: buffer size */
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+ cmp r10, r11
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+ lslgt r8, r11, #16
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addle r8, #8
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1:
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/* RX */
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/* shall we receive? */
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- ldr r13, [r12, #SSI_SIER]
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- tst r13, #SSI_SIER_RFF0_EN
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+ ldr r11, [r12, #SSI_SIER]
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+ tst r11, #SSI_SIER_RFF0_EN
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beq 1f
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/* RX FIFO full? */
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- ldr r13, [r12, #SSI_SISR]
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- tst r13, #SSI_SISR_RFF0
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+ ldr r11, [r12, #SSI_SISR]
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+ tst r11, #SSI_SISR_RFF0
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beq 1f
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- ldr r11, imx_ssi_fiq_rx_buffer
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+ ldr r13, .L_imx_ssi_fiq_rx_buffer
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mov r10, #0x10000
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sub r10, #1
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and r10, r10, r9 /* r10: current buffer offset */
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- add r11, r11, r10
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+ add r13, r13, r10
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- ldr r13, [r12, #SSI_SACNT]
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- tst r13, #SSI_SACNT_AC97EN
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+ ldr r11, [r12, #SSI_SACNT]
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+ tst r11, #SSI_SACNT_AC97EN
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- ldr r13, [r12, #SSI_SRX0]
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- strh r13, [r11]
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+ ldr r11, [r12, #SSI_SRX0]
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+ strh r11, [r13]
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- ldr r13, [r12, #SSI_SRX0]
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- strh r13, [r11, #2]
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+ ldr r11, [r12, #SSI_SRX0]
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+ strh r11, [r13, #2]
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/* dummy read to skip slot 12 */
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- ldrne r13, [r12, #SSI_SRX0]
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+ ldrne r11, [r12, #SSI_SRX0]
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- ldr r13, [r12, #SSI_SRX0]
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- strh r13, [r11, #4]
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+ ldr r11, [r12, #SSI_SRX0]
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+ strh r11, [r13, #4]
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- ldr r13, [r12, #SSI_SRX0]
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- strh r13, [r11, #6]
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+ ldr r11, [r12, #SSI_SRX0]
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+ strh r11, [r13, #6]
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/* dummy read to skip slot 12 */
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- ldrne r13, [r12, #SSI_SRX0]
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+ ldrne r11, [r12, #SSI_SRX0]
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add r10, #8
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- lsr r13, r9, #16 /* r13: buffer size */
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- cmp r10, r13
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- lslgt r9, r13, #16
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+ lsr r11, r9, #16 /* r11: buffer size */
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+ cmp r10, r11
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+ lslgt r9, r11, #16
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addle r9, #8
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1:
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@@ -126,11 +133,15 @@ imx_ssi_fiq_start:
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subs pc, lr, #4
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.align
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+.L_imx_ssi_fiq_base:
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imx_ssi_fiq_base:
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.word 0x0
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+.L_imx_ssi_fiq_rx_buffer:
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imx_ssi_fiq_rx_buffer:
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.word 0x0
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+.L_imx_ssi_fiq_tx_buffer:
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imx_ssi_fiq_tx_buffer:
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.word 0x0
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+.L_imx_ssi_fiq_end:
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imx_ssi_fiq_end:
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