[ALSA] Revised AT32 ASoC Patch
Attached is a revised version of my patch to add AT32 to ASoC. This cleans
most of the style issues associated with the previous patch. Also fixes an
issue with the playpaq_wm8510.c code depending on a non-released patch to th
AT32 portmux support.
Patch is against 2.6.24.3.atmel.3 kernel, the latest AVR32 kernel Atmel has
released, with the linux-2.6-asoc patches from when v2.6.24 was tagged also
applied.
[Fixed up minor checkpatch issues and updated for current kernels -- broonie]
Signed-off-by: Geoffrey Wossum <gwossum@acm.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/soc/at32/at32-pcm.h b/sound/soc/at32/at32-pcm.h
new file mode 100644
index 0000000..2a52430
--- /dev/null
+++ b/sound/soc/at32/at32-pcm.h
@@ -0,0 +1,79 @@
+/* sound/soc/at32/at32-pcm.h
+ * ASoC PCM interface for Atmel AT32 SoC
+ *
+ * Copyright (C) 2008 Long Range Systems
+ * Geoffrey Wossum <gwossum@acm.org>
+ *
+ * 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.
+ */
+
+#ifndef __SOUND_SOC_AT32_AT32_PCM_H
+#define __SOUND_SOC_AT32_AT32_PCM_H __FILE__
+
+#include <linux/atmel-ssc.h>
+
+
+/*
+ * Registers and status bits that are required by the PCM driver
+ * TODO: Is ptcr really used?
+ */
+struct at32_pdc_regs {
+ u32 xpr; /* PDC RX/TX pointer */
+ u32 xcr; /* PDC RX/TX counter */
+ u32 xnpr; /* PDC next RX/TX pointer */
+ u32 xncr; /* PDC next RX/TX counter */
+ u32 ptcr; /* PDC transfer control */
+};
+
+
+
+/*
+ * SSC mask info
+ */
+struct at32_ssc_mask {
+ u32 ssc_enable; /* SSC RX/TX enable */
+ u32 ssc_disable; /* SSC RX/TX disable */
+ u32 ssc_endx; /* SSC ENDTX or ENDRX */
+ u32 ssc_endbuf; /* SSC TXBUFF or RXBUFF */
+ u32 pdc_enable; /* PDC RX/TX enable */
+ u32 pdc_disable; /* PDC RX/TX disable */
+};
+
+
+
+/*
+ * This structure, shared between the PCM driver and the interface,
+ * contains all information required by the PCM driver to perform the
+ * PDC DMA operation. All fields except dma_intr_handler() are initialized
+ * by the interface. The dms_intr_handler() pointer is set by the PCM
+ * driver and called by the interface SSC interrupt handler if it is
+ * non-NULL.
+ */
+struct at32_pcm_dma_params {
+ char *name; /* stream identifier */
+ int pdc_xfer_size; /* PDC counter increment in bytes */
+ struct ssc_device *ssc; /* SSC device for stream */
+ struct at32_pdc_regs *pdc; /* PDC register info */
+ struct at32_ssc_mask *mask; /* SSC mask info */
+ struct snd_pcm_substream *substream;
+ void (*dma_intr_handler) (u32, struct snd_pcm_substream *);
+};
+
+
+
+/*
+ * The AT32 ASoC platform driver
+ */
+extern struct snd_soc_platform at32_soc_platform;
+
+
+
+/*
+ * SSC register access (since ssc_writel() / ssc_readl() require literal name)
+ */
+#define ssc_readx(base, reg) (__raw_readl((base) + (reg)))
+#define ssc_writex(base, reg, value) __raw_writel((value), (base) + (reg))
+
+#endif /* __SOUND_SOC_AT32_AT32_PCM_H */