Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into next

1 files changed, 210 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c24xx/include/mach/dma.h b/arch/arm/mach-s3c24xx/include/mach/dma.h
new file mode 100644
index 000000000000..acbdfecd4186
--- /dev/null
+++ b/arch/arm/mach-s3c24xx/include/mach/dma.h
@@ -0,0 +1,210 @@
+/* arch/arm/mach-s3c2410/include/mach/dma.h
+ *
+ * Copyright (C) 2003-2006 Simtec Electronics
+ *	Ben Dooks <ben@simtec.co.uk>
+ *
+ * Samsung S3C24XX DMA support
+ *
+ * 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 __ASM_ARCH_DMA_H
+#define __ASM_ARCH_DMA_H __FILE__
+
+#include <linux/device.h>
+
+#define MAX_DMA_TRANSFER_SIZE   0x100000 /* Data Unit is half word  */
+
+/* We use `virtual` dma channels to hide the fact we have only a limited
+ * number of DMA channels, and not of all of them (dependent on the device)
+ * can be attached to any DMA source. We therefore let the DMA core handle
+ * the allocation of hardware channels to clients.
+*/
+
+enum dma_ch {
+	DMACH_XD0,
+	DMACH_XD1,
+	DMACH_SDI,
+	DMACH_SPI0,
+	DMACH_SPI1,
+	DMACH_UART0,
+	DMACH_UART1,
+	DMACH_UART2,
+	DMACH_TIMER,
+	DMACH_I2S_IN,
+	DMACH_I2S_OUT,
+	DMACH_PCM_IN,
+	DMACH_PCM_OUT,
+	DMACH_MIC_IN,
+	DMACH_USB_EP1,
+	DMACH_USB_EP2,
+	DMACH_USB_EP3,
+	DMACH_USB_EP4,
+	DMACH_UART0_SRC2,	/* s3c2412 second uart sources */
+	DMACH_UART1_SRC2,
+	DMACH_UART2_SRC2,
+	DMACH_UART3,		/* s3c2443 has extra uart */
+	DMACH_UART3_SRC2,
+	DMACH_MAX,		/* the end entry */
+};
+
+static inline bool samsung_dma_has_circular(void)
+{
+	return false;
+}
+
+static inline bool samsung_dma_is_dmadev(void)
+{
+	return false;
+}
+
+#include <plat/dma.h>
+
+#define DMACH_LOW_LEVEL	(1<<28)	/* use this to specifiy hardware ch no */
+
+/* we have 4 dma channels */
+#if !defined(CONFIG_CPU_S3C2443) && !defined(CONFIG_CPU_S3C2416)
+#define S3C_DMA_CHANNELS		(4)
+#else
+#define S3C_DMA_CHANNELS		(6)
+#endif
+
+/* types */
+
+enum s3c2410_dma_state {
+	S3C2410_DMA_IDLE,
+	S3C2410_DMA_RUNNING,
+	S3C2410_DMA_PAUSED
+};
+
+/* enum s3c2410_dma_loadst
+ *
+ * This represents the state of the DMA engine, wrt to the loaded / running
+ * transfers. Since we don't have any way of knowing exactly the state of
+ * the DMA transfers, we need to know the state to make decisions on wether
+ * we can
+ *
+ * S3C2410_DMA_NONE
+ *
+ * There are no buffers loaded (the channel should be inactive)
+ *
+ * S3C2410_DMA_1LOADED
+ *
+ * There is one buffer loaded, however it has not been confirmed to be
+ * loaded by the DMA engine. This may be because the channel is not
+ * yet running, or the DMA driver decided that it was too costly to
+ * sit and wait for it to happen.
+ *
+ * S3C2410_DMA_1RUNNING
+ *
+ * The buffer has been confirmed running, and not finisged
+ *
+ * S3C2410_DMA_1LOADED_1RUNNING
+ *
+ * There is a buffer waiting to be loaded by the DMA engine, and one
+ * currently running.
+*/
+
+enum s3c2410_dma_loadst {
+	S3C2410_DMALOAD_NONE,
+	S3C2410_DMALOAD_1LOADED,
+	S3C2410_DMALOAD_1RUNNING,
+	S3C2410_DMALOAD_1LOADED_1RUNNING,
+};
+
+
+/* flags */
+
+#define S3C2410_DMAF_SLOW         (1<<0)   /* slow, so don't worry about
+					    * waiting for reloads */
+#define S3C2410_DMAF_AUTOSTART    (1<<1)   /* auto-start if buffer queued */
+
+#define S3C2410_DMAF_CIRCULAR	(1 << 2)	/* no circular dma support */
+
+/* dma buffer */
+
+struct s3c2410_dma_buf;
+
+/* s3c2410_dma_buf
+ *
+ * internally used buffer structure to describe a queued or running
+ * buffer.
+*/
+
+struct s3c2410_dma_buf {
+	struct s3c2410_dma_buf	*next;
+	int			 magic;		/* magic */
+	int			 size;		/* buffer size in bytes */
+	dma_addr_t		 data;		/* start of DMA data */
+	dma_addr_t		 ptr;		/* where the DMA got to [1] */
+	void			*id;		/* client's id */
+};
+
+/* [1] is this updated for both recv/send modes? */
+
+struct s3c2410_dma_stats {
+	unsigned long		loads;
+	unsigned long		timeout_longest;
+	unsigned long		timeout_shortest;
+	unsigned long		timeout_avg;
+	unsigned long		timeout_failed;
+};
+
+struct s3c2410_dma_map;
+
+/* struct s3c2410_dma_chan
+ *
+ * full state information for each DMA channel
+*/
+
+struct s3c2410_dma_chan {
+	/* channel state flags and information */
+	unsigned char		 number;      /* number of this dma channel */
+	unsigned char		 in_use;      /* channel allocated */
+	unsigned char		 irq_claimed; /* irq claimed for channel */
+	unsigned char		 irq_enabled; /* irq enabled for channel */
+	unsigned char		 xfer_unit;   /* size of an transfer */
+
+	/* channel state */
+
+	enum s3c2410_dma_state	 state;
+	enum s3c2410_dma_loadst	 load_state;
+	struct s3c2410_dma_client *client;
+
+	/* channel configuration */
+	enum dma_data_direction	 source;
+	enum dma_ch		 req_ch;
+	unsigned long		 dev_addr;
+	unsigned long		 load_timeout;
+	unsigned int		 flags;		/* channel flags */
+
+	struct s3c24xx_dma_map	*map;		/* channel hw maps */
+
+	/* channel's hardware position and configuration */
+	void __iomem		*regs;		/* channels registers */
+	void __iomem		*addr_reg;	/* data address register */
+	unsigned int		 irq;		/* channel irq */
+	unsigned long		 dcon;		/* default value of DCON */
+
+	/* driver handles */
+	s3c2410_dma_cbfn_t	 callback_fn;	/* buffer done callback */
+	s3c2410_dma_opfn_t	 op_fn;		/* channel op callback */
+
+	/* stats gathering */
+	struct s3c2410_dma_stats *stats;
+	struct s3c2410_dma_stats  stats_store;
+
+	/* buffer list and information */
+	struct s3c2410_dma_buf	*curr;		/* current dma buffer */
+	struct s3c2410_dma_buf	*next;		/* next buffer to load */
+	struct s3c2410_dma_buf	*end;		/* end of queue */
+
+	/* system device */
+	struct device	dev;
+};
+
+typedef unsigned long dma_device_t;
+
+#endif /* __ASM_ARCH_DMA_H */