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linux/arch/arm/mach-imx/ssi-fiq.S

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ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
/*
* 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
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
/*
* 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.
*/
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
imx_ssi_fiq_start:
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
ldr r12, .L_imx_ssi_fiq_base
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
/* TX */
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
ldr r13, .L_imx_ssi_fiq_tx_buffer
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
/* shall we send? */
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
ldr r11, [r12, #SSI_SIER]
tst r11, #SSI_SIER_TFE0_EN
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
beq 1f
/* TX FIFO empty? */
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
ldr r11, [r12, #SSI_SISR]
tst r11, #SSI_SISR_TFE0
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
beq 1f
mov r10, #0x10000
sub r10, #1
and r10, r10, r8 /* r10: current buffer offset */
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
add r13, r13, r10
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
ldrh r11, [r13]
strh r11, [r12, #SSI_STX0]
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
ldrh r11, [r13, #2]
strh r11, [r12, #SSI_STX0]
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
ldrh r11, [r13, #4]
strh r11, [r12, #SSI_STX0]
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
ldrh r11, [r13, #6]
strh r11, [r12, #SSI_STX0]
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
add r10, #8
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
lsr r11, r8, #16 /* r11: buffer size */
cmp r10, r11
lslgt r8, r11, #16
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
addle r8, #8
1:
/* RX */
/* shall we receive? */
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
ldr r11, [r12, #SSI_SIER]
tst r11, #SSI_SIER_RFF0_EN
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
beq 1f
/* RX FIFO full? */
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
ldr r11, [r12, #SSI_SISR]
tst r11, #SSI_SISR_RFF0
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
beq 1f
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
ldr r13, .L_imx_ssi_fiq_rx_buffer
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
mov r10, #0x10000
sub r10, #1
and r10, r10, r9 /* r10: current buffer offset */
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
add r13, r13, r10
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
ldr r11, [r12, #SSI_SACNT]
tst r11, #SSI_SACNT_AC97EN
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
ldr r11, [r12, #SSI_SRX0]
strh r11, [r13]
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
ldr r11, [r12, #SSI_SRX0]
strh r11, [r13, #2]
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
/* dummy read to skip slot 12 */
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
ldrne r11, [r12, #SSI_SRX0]
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
ldr r11, [r12, #SSI_SRX0]
strh r11, [r13, #4]
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
ldr r11, [r12, #SSI_SRX0]
strh r11, [r13, #6]
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
/* dummy read to skip slot 12 */
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
ldrne r11, [r12, #SSI_SRX0]
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
add r10, #8
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
lsr r11, r9, #16 /* r11: buffer size */
cmp r10, r11
lslgt r9, r11, #16
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
addle r9, #8
1:
@ return from FIQ
subs pc, lr, #4
ARM: mxc: Correct data alignment in headsmp.S for CONFIG_THUMB2_KERNEL Directives such as .long and .word do not magically cause the assembler location counter to become aligned in gas. As a result, using these directives in code sections can result in misaligned data words when building a Thumb-2 kernel (CONFIG_THUMB2_KERNEL). This is a Bad Thing, since the ABI permits the compiler to assume that fundamental types of word size or above are word- aligned when accessing them from C. If the data is not really word-aligned, this can cause impaired performance and stray alignment faults in some circumstances. In general, the following rules should be applied when using data word declaration directives inside code sections: * .quad and .double: .align 3 * .long, .word, .single, .float: .align (or .align 2) * .short: No explicit alignment required, since Thumb-2 instructions are always 2 or 4 bytes in size. immediately after an instruction. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> LAKML-Reference: 1289913217-8672-1-git-send-email-dave.martin@linaro.org Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2010-11-16 21:13:37 +08:00
.align
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
.L_imx_ssi_fiq_base:
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
imx_ssi_fiq_base:
.word 0x0
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
.L_imx_ssi_fiq_rx_buffer:
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
imx_ssi_fiq_rx_buffer:
.word 0x0
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
.L_imx_ssi_fiq_tx_buffer:
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
imx_ssi_fiq_tx_buffer:
.word 0x0
ARM: mxc: ssi-fiq: Make ssi-fiq.S Thumb-2 compatible Because FIQ handlers get copied straight into the vectors page to the FIQ vector entry point, FIQ handlers in a Thumb-2 kernel must start in Thumb-2. A Thumb-2 kernel enters all exception vectors in Thumb-2. This patch adapts the mxc SSI FIQ code suitable for a Thumb-2 kernel. The code contained use of r13 (sp) which isn't allowed in Thumb-2. r11 and r13 have been swapped throughout the file to work around this. Currently, the way that the function to be copied is located using labels is a bit ugly: we cannot annotate the FIQ handler properly as a Thumb-2 function, because this would set bit 0 of the label address seen by the linker, causing off-by-one errors when copying the function. Ideally, the copy would be done with fncpy(), but this would require changes to the common set_fiq_handler() function. For now, we don't touch this. References to locally-defined global symbols with adr and ldr may not be accepted by the assembler in Thumb-2. Local shadow symbols are added to work around this. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2012-08-10 19:53:24 +08:00
.L_imx_ssi_fiq_end:
ASoC: Add a new imx-ssi sound driver The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27. This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Javier Martin <javier.martin@vista-silicon.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-11-25 23:41:04 +08:00
imx_ssi_fiq_end: