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>

3 files changed, 160 insertions, 0 deletions

diff --git a/arch/arm/plat-mxc/Makefile b/arch/arm/plat-mxc/Makefile
index e3212c8ff421..b0b9fc3e5ab0 100644
--- a/arch/arm/plat-mxc/Makefile
+++ b/arch/arm/plat-mxc/Makefile
@@ -9,3 +9,9 @@ obj-$(CONFIG_ARCH_MX1) += iomux-mx1-mx2.o dma-mx1-mx2.o
 obj-$(CONFIG_ARCH_MX2) += iomux-mx1-mx2.o dma-mx1-mx2.o
 obj-$(CONFIG_ARCH_MXC_IOMUX_V3) += iomux-v3.o
 obj-$(CONFIG_MXC_PWM)  += pwm.o
+obj-$(CONFIG_ARCH_MXC_AUDMUX_V1) += audmux-v1.o
+obj-$(CONFIG_ARCH_MXC_AUDMUX_V2) += audmux-v2.o
+ifdef CONFIG_SND_IMX_SOC
+obj-y += ssi-fiq.o
+obj-y += ssi-fiq-ksym.o
+endif
diff --git a/arch/arm/plat-mxc/ssi-fiq-ksym.c b/arch/arm/plat-mxc/ssi-fiq-ksym.c
new file mode 100644
index 000000000000..b5fad454da78
--- /dev/null
+++ b/arch/arm/plat-mxc/ssi-fiq-ksym.c
@@ -0,0 +1,20 @@
+/*
+ * Exported ksyms for the SSI FIQ handler
+ *
+ * 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/module.h>
+
+#include <mach/ssi.h>
+
+EXPORT_SYMBOL(imx_ssi_fiq_tx_buffer);
+EXPORT_SYMBOL(imx_ssi_fiq_rx_buffer);
+EXPORT_SYMBOL(imx_ssi_fiq_start);
+EXPORT_SYMBOL(imx_ssi_fiq_end);
+EXPORT_SYMBOL(imx_ssi_fiq_base);
+
diff --git a/arch/arm/plat-mxc/ssi-fiq.S b/arch/arm/plat-mxc/ssi-fiq.S
new file mode 100644
index 000000000000..4ddce565b353
--- /dev/null
+++ b/arch/arm/plat-mxc/ssi-fiq.S
@@ -0,0 +1,134 @@
+/*
+ *  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:
+                ldr r12, imx_ssi_fiq_base
+
+                /* TX */
+                ldr r11, imx_ssi_fiq_tx_buffer
+
+                /* shall we send? */
+                ldr r13, [r12, #SSI_SIER]
+                tst r13, #SSI_SIER_TFE0_EN
+                beq 1f
+
+                /* TX FIFO empty? */
+                ldr r13, [r12, #SSI_SISR]
+                tst r13, #SSI_SISR_TFE0
+                beq 1f
+
+                mov r10, #0x10000
+                sub r10, #1
+                and r10, r10, r8        /* r10: current buffer offset */
+
+                add r11, r11, r10
+
+                ldrh r13, [r11]
+                strh r13, [r12, #SSI_STX0]
+
+                ldrh r13, [r11, #2]
+                strh r13, [r12, #SSI_STX0]
+
+                ldrh r13, [r11, #4]
+                strh r13, [r12, #SSI_STX0]
+
+                ldrh r13, [r11, #6]
+                strh r13, [r12, #SSI_STX0]
+
+                add r10, #8
+                lsr r13, r8, #16        /* r13: buffer size */
+                cmp r10, r13
+                lslgt r8, r13, #16
+                addle r8, #8
+1:
+                /* RX */
+
+                /* shall we receive? */
+                ldr r13, [r12, #SSI_SIER]
+                tst r13, #SSI_SIER_RFF0_EN
+                beq 1f
+
+                /* RX FIFO full? */
+                ldr r13, [r12, #SSI_SISR]
+                tst r13, #SSI_SISR_RFF0
+                beq 1f
+
+                ldr r11, imx_ssi_fiq_rx_buffer
+
+                mov r10, #0x10000
+                sub r10, #1
+                and r10, r10, r9        /* r10: current buffer offset */
+
+                add r11, r11, r10
+
+                ldr r13, [r12, #SSI_SACNT]
+                tst r13, #SSI_SACNT_AC97EN
+
+                ldr r13, [r12, #SSI_SRX0]
+                strh r13, [r11]
+
+                ldr r13, [r12, #SSI_SRX0]
+                strh r13, [r11, #2]
+
+                /* dummy read to skip slot 12 */
+                ldrne r13, [r12, #SSI_SRX0]
+
+                ldr r13, [r12, #SSI_SRX0]
+                strh r13, [r11, #4]
+
+                ldr r13, [r12, #SSI_SRX0]
+                strh r13, [r11, #6]
+
+                /* dummy read to skip slot 12 */
+                ldrne r13, [r12, #SSI_SRX0]
+
+                add r10, #8
+                lsr r13, r9, #16        /* r13: buffer size */
+                cmp r10, r13
+                lslgt r9, r13, #16
+                addle r9, #8
+
+1:
+                @ return from FIQ
+                subs    pc, lr, #4
+imx_ssi_fiq_base:
+                .word 0x0
+imx_ssi_fiq_rx_buffer:
+                .word 0x0
+imx_ssi_fiq_tx_buffer:
+                .word 0x0
+imx_ssi_fiq_end:
+